patch-2.3.99-pre1 linux/drivers/block/ide-tape.c
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- Lines: 6032
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.3.51/linux/drivers/block/ide-tape.c
- Orig date:
Sat Feb 26 22:31:44 2000
diff -u --recursive --new-file v2.3.51/linux/drivers/block/ide-tape.c linux/drivers/block/ide-tape.c
@@ -1,6031 +0,0 @@
-/*
- * linux/drivers/block/ide-tape.c Version 1.16f Dec 15, 1999
- *
- * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il>
- *
- * This driver was constructed as a student project in the software laboratory
- * of the faculty of electrical engineering in the Technion - Israel's
- * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
- *
- * It is hereby placed under the terms of the GNU general public license.
- * (See linux/COPYING).
- */
-
-/*
- * IDE ATAPI streaming tape driver.
- *
- * This driver is a part of the Linux ide driver and works in co-operation
- * with linux/drivers/block/ide.c.
- *
- * The driver, in co-operation with ide.c, basically traverses the
- * request-list for the block device interface. The character device
- * interface, on the other hand, creates new requests, adds them
- * to the request-list of the block device, and waits for their completion.
- *
- * Pipelined operation mode is now supported on both reads and writes.
- *
- * The block device major and minor numbers are determined from the
- * tape's relative position in the ide interfaces, as explained in ide.c.
- *
- * The character device interface consists of the following devices:
- *
- * ht0 major 37, minor 0 first IDE tape, rewind on close.
- * ht1 major 37, minor 1 second IDE tape, rewind on close.
- * ...
- * nht0 major 37, minor 128 first IDE tape, no rewind on close.
- * nht1 major 37, minor 129 second IDE tape, no rewind on close.
- * ...
- *
- * Run linux/scripts/MAKEDEV.ide to create the above entries.
- *
- * The general magnetic tape commands compatible interface, as defined by
- * include/linux/mtio.h, is accessible through the character device.
- *
- * General ide driver configuration options, such as the interrupt-unmask
- * flag, can be configured by issuing an ioctl to the block device interface,
- * as any other ide device.
- *
- * Our own ide-tape ioctl's can be issued to either the block device or
- * the character device interface.
- *
- * Maximal throughput with minimal bus load will usually be achieved in the
- * following scenario:
- *
- * 1. ide-tape is operating in the pipelined operation mode.
- * 2. No buffering is performed by the user backup program.
- *
- * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive.
- *
- * Ver 0.1 Nov 1 95 Pre-working code :-)
- * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure
- * was successful ! (Using tar cvf ... on the block
- * device interface).
- * A longer backup resulted in major swapping, bad
- * overall Linux performance and eventually failed as
- * we received non serial read-ahead requests from the
- * buffer cache.
- * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the
- * character device interface. Linux's responsiveness
- * and performance doesn't seem to be much affected
- * from the background backup procedure.
- * Some general mtio.h magnetic tape operations are
- * now supported by our character device. As a result,
- * popular tape utilities are starting to work with
- * ide tapes :-)
- * The following configurations were tested:
- * 1. An IDE ATAPI TAPE shares the same interface
- * and irq with an IDE ATAPI CDROM.
- * 2. An IDE ATAPI TAPE shares the same interface
- * and irq with a normal IDE disk.
- * Both configurations seemed to work just fine !
- * However, to be on the safe side, it is meanwhile
- * recommended to give the IDE TAPE its own interface
- * and irq.
- * The one thing which needs to be done here is to
- * add a "request postpone" feature to ide.c,
- * so that we won't have to wait for the tape to finish
- * performing a long media access (DSC) request (such
- * as a rewind) before we can access the other device
- * on the same interface. This effect doesn't disturb
- * normal operation most of the time because read/write
- * requests are relatively fast, and once we are
- * performing one tape r/w request, a lot of requests
- * from the other device can be queued and ide.c will
- * service all of them after this single tape request.
- * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree.
- * On each read / write request, we now ask the drive
- * if we can transfer a constant number of bytes
- * (a parameter of the drive) only to its buffers,
- * without causing actual media access. If we can't,
- * we just wait until we can by polling the DSC bit.
- * This ensures that while we are not transferring
- * more bytes than the constant referred to above, the
- * interrupt latency will not become too high and
- * we won't cause an interrupt timeout, as happened
- * occasionally in the previous version.
- * While polling for DSC, the current request is
- * postponed and ide.c is free to handle requests from
- * the other device. This is handled transparently to
- * ide.c. The hwgroup locking method which was used
- * in the previous version was removed.
- * Use of new general features which are provided by
- * ide.c for use with atapi devices.
- * (Programming done by Mark Lord)
- * Few potential bug fixes (Again, suggested by Mark)
- * Single character device data transfers are now
- * not limited in size, as they were before.
- * We are asking the tape about its recommended
- * transfer unit and send a larger data transfer
- * as several transfers of the above size.
- * For best results, use an integral number of this
- * basic unit (which is shown during driver
- * initialization). I will soon add an ioctl to get
- * this important parameter.
- * Our data transfer buffer is allocated on startup,
- * rather than before each data transfer. This should
- * ensure that we will indeed have a data buffer.
- * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape
- * shared an interface with another device.
- * (poll_for_dsc was a complete mess).
- * Removed some old (non-active) code which had
- * to do with supporting buffer cache originated
- * requests.
- * The block device interface can now be opened, so
- * that general ide driver features like the unmask
- * interrupts flag can be selected with an ioctl.
- * This is the only use of the block device interface.
- * New fast pipelined operation mode (currently only on
- * writes). When using the pipelined mode, the
- * throughput can potentially reach the maximum
- * tape supported throughput, regardless of the
- * user backup program. On my tape drive, it sometimes
- * boosted performance by a factor of 2. Pipelined
- * mode is enabled by default, but since it has a few
- * downfalls as well, you may want to disable it.
- * A short explanation of the pipelined operation mode
- * is available below.
- * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition.
- * Added pipeline read mode. As a result, restores
- * are now as fast as backups.
- * Optimized shared interface behavior. The new behavior
- * typically results in better IDE bus efficiency and
- * higher tape throughput.
- * Pre-calculation of the expected read/write request
- * service time, based on the tape's parameters. In
- * the pipelined operation mode, this allows us to
- * adjust our polling frequency to a much lower value,
- * and thus to dramatically reduce our load on Linux,
- * without any decrease in performance.
- * Implemented additional mtio.h operations.
- * The recommended user block size is returned by
- * the MTIOCGET ioctl.
- * Additional minor changes.
- * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the
- * use of some block sizes during a restore procedure.
- * The character device interface will now present a
- * continuous view of the media - any mix of block sizes
- * during a backup/restore procedure is supported. The
- * driver will buffer the requests internally and
- * convert them to the tape's recommended transfer
- * unit, making performance almost independent of the
- * chosen user block size.
- * Some improvements in error recovery.
- * By cooperating with ide-dma.c, bus mastering DMA can
- * now sometimes be used with IDE tape drives as well.
- * Bus mastering DMA has the potential to dramatically
- * reduce the CPU's overhead when accessing the device,
- * and can be enabled by using hdparm -d1 on the tape's
- * block device interface. For more info, read the
- * comments in ide-dma.c.
- * Ver 1.4 Mar 13 96 Fixed serialize support.
- * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85.
- * Fixed pipelined read mode inefficiency.
- * Fixed nasty null dereferencing bug.
- * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver.
- * Fixed end of media bug.
- * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model.
- * Ver 1.8 Sep 26 96 Attempt to find a better balance between good
- * interactive response and high system throughput.
- * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather
- * than requiring an explicit FSF command.
- * Abort pending requests at end of media.
- * MTTELL was sometimes returning incorrect results.
- * Return the real block size in the MTIOCGET ioctl.
- * Some error recovery bug fixes.
- * Ver 1.10 Nov 5 96 Major reorganization.
- * Reduced CPU overhead a bit by eliminating internal
- * bounce buffers.
- * Added module support.
- * Added multiple tape drives support.
- * Added partition support.
- * Rewrote DSC handling.
- * Some portability fixes.
- * Removed ide-tape.h.
- * Additional minor changes.
- * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling.
- * Use ide_stall_queue() for DSC overlap.
- * Use the maximum speed rather than the current speed
- * to compute the request service time.
- * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data
- * corruption, which could occur if the total number
- * of bytes written to the tape was not an integral
- * number of tape blocks.
- * Add support for INTERRUPT DRQ devices.
- * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB
- * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives.
- * Replace cli()/sti() with hwgroup spinlocks.
- * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup
- * spinlock with private per-tape spinlock.
- * Ver 1.16 Sep 1 99 Add OnStream tape support.
- * Abort read pipeline on EOD.
- * Wait for the tape to become ready in case it returns
- * "in the process of becoming ready" on open().
- * Fix zero padding of the last written block in
- * case the tape block size is larger than PAGE_SIZE.
- * Decrease the default disconnection time to tn.
- * Ver 1.16e Oct 3 99 Minor fixes.
- * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen,
- * niessen@iae.nl / arnold.niessen@philips.com
- * GO-1) Undefined code in idetape_read_position
- * according to Gadi's email
- * AJN-1) Minor fix asc == 11 should be asc == 0x11
- * in idetape_issue_packet_command (did effect
- * debugging output only)
- * AJN-2) Added more debugging output, and
- * added ide-tape: where missing. I would also
- * like to add tape->name where possible
- * AJN-3) Added different debug_level's
- * via /proc/ide/hdc/settings
- * "debug_level" determines amount of debugging output;
- * can be changed using /proc/ide/hdx/settings
- * 0 : almost no debugging output
- * 1 : 0+output errors only
- * 2 : 1+output all sensekey/asc
- * 3 : 2+follow all chrdev related procedures
- * 4 : 3+follow all procedures
- * 5 : 4+include pc_stack rq_stack info
- * 6 : 5+USE_COUNT updates
- * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail
- * from 5 to 10 minutes
- * AJN-5) Changed maximum number of blocks to skip when
- * reading tapes with multiple consecutive write
- * errors from 100 to 1000 in idetape_get_logical_blk
- * Proposed changes to code:
- * 1) output "logical_blk_num" via /proc
- * 2) output "current_operation" via /proc
- * 3) Either solve or document the fact that `mt rewind' is
- * required after reading from /dev/nhtx to be
- * able to rmmod the idetape module;
- * Also, sometimes an application finishes but the
- * device remains `busy' for some time. Same cause ?
- * Proposed changes to release-notes:
- * 4) write a simple `quickstart' section in the
- * release notes; I volunteer if you don't want to
- * 5) include a pointer to video4linux in the doc
- * to stimulate video applications
- * 6) release notes lines 331 and 362: explain what happens
- * if the application data rate is higher than 1100 KB/s;
- * similar approach to lower-than-500 kB/s ?
- * 7) 6.6 Comparison; wouldn't it be better to allow different
- * strategies for read and write ?
- * Wouldn't it be better to control the tape buffer
- * contents instead of the bandwidth ?
- * 8) line 536: replace will by would (if I understand
- * this section correctly, a hypothetical and unwanted situation
- * is being described)
- * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames.
- *
- *
- * Here are some words from the first releases of hd.c, which are quoted
- * in ide.c and apply here as well:
- *
- * | Special care is recommended. Have Fun!
- *
- */
-
-/*
- * An overview of the pipelined operation mode.
- *
- * In the pipelined write mode, we will usually just add requests to our
- * pipeline and return immediately, before we even start to service them. The
- * user program will then have enough time to prepare the next request while
- * we are still busy servicing previous requests. In the pipelined read mode,
- * the situation is similar - we add read-ahead requests into the pipeline,
- * before the user even requested them.
- *
- * The pipeline can be viewed as a "safety net" which will be activated when
- * the system load is high and prevents the user backup program from keeping up
- * with the current tape speed. At this point, the pipeline will get
- * shorter and shorter but the tape will still be streaming at the same speed.
- * Assuming we have enough pipeline stages, the system load will hopefully
- * decrease before the pipeline is completely empty, and the backup program
- * will be able to "catch up" and refill the pipeline again.
- *
- * When using the pipelined mode, it would be best to disable any type of
- * buffering done by the user program, as ide-tape already provides all the
- * benefits in the kernel, where it can be done in a more efficient way.
- * As we will usually not block the user program on a request, the most
- * efficient user code will then be a simple read-write-read-... cycle.
- * Any additional logic will usually just slow down the backup process.
- *
- * Using the pipelined mode, I get a constant over 400 KBps throughput,
- * which seems to be the maximum throughput supported by my tape.
- *
- * However, there are some downfalls:
- *
- * 1. We use memory (for data buffers) in proportional to the number
- * of pipeline stages (each stage is about 26 KB with my tape).
- * 2. In the pipelined write mode, we cheat and postpone error codes
- * to the user task. In read mode, the actual tape position
- * will be a bit further than the last requested block.
- *
- * Concerning (1):
- *
- * 1. We allocate stages dynamically only when we need them. When
- * we don't need them, we don't consume additional memory. In
- * case we can't allocate stages, we just manage without them
- * (at the expense of decreased throughput) so when Linux is
- * tight in memory, we will not pose additional difficulties.
- *
- * 2. The maximum number of stages (which is, in fact, the maximum
- * amount of memory) which we allocate is limited by the compile
- * time parameter IDETAPE_MAX_PIPELINE_STAGES.
- *
- * 3. The maximum number of stages is a controlled parameter - We
- * don't start from the user defined maximum number of stages
- * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we
- * will not even allocate this amount of stages if the user
- * program can't handle the speed). We then implement a feedback
- * loop which checks if the pipeline is empty, and if it is, we
- * increase the maximum number of stages as necessary until we
- * reach the optimum value which just manages to keep the tape
- * busy with minimum allocated memory or until we reach
- * IDETAPE_MAX_PIPELINE_STAGES.
- *
- * Concerning (2):
- *
- * In pipelined write mode, ide-tape can not return accurate error codes
- * to the user program since we usually just add the request to the
- * pipeline without waiting for it to be serviced. In case an error
- * occurs, I will report it on the next user request.
- *
- * In the pipelined read mode, subsequent read requests or forward
- * filemark spacing will perform correctly, as we preserve all blocks
- * and filemarks which we encountered during our excess read-ahead.
- *
- * For accurate tape positioning and error reporting, disabling
- * pipelined mode might be the best option.
- *
- * You can enable/disable/tune the pipelined operation mode by adjusting
- * the compile time parameters below.
- */
-
-/*
- * Possible improvements.
- *
- * 1. Support for the ATAPI overlap protocol.
- *
- * In order to maximize bus throughput, we currently use the DSC
- * overlap method which enables ide.c to service requests from the
- * other device while the tape is busy executing a command. The
- * DSC overlap method involves polling the tape's status register
- * for the DSC bit, and servicing the other device while the tape
- * isn't ready.
- *
- * In the current QIC development standard (December 1995),
- * it is recommended that new tape drives will *in addition*
- * implement the ATAPI overlap protocol, which is used for the
- * same purpose - efficient use of the IDE bus, but is interrupt
- * driven and thus has much less CPU overhead.
- *
- * ATAPI overlap is likely to be supported in most new ATAPI
- * devices, including new ATAPI cdroms, and thus provides us
- * a method by which we can achieve higher throughput when
- * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device.
- */
-
-#define IDETAPE_VERSION "1.16f"
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/timer.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/major.h>
-#include <linux/devfs_fs_kernel.h>
-#include <linux/errno.h>
-#include <linux/genhd.h>
-#include <linux/malloc.h>
-#include <linux/pci.h>
-#include <linux/ide.h>
-
-#include <asm/byteorder.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-#include <asm/io.h>
-#include <asm/unaligned.h>
-#include <asm/bitops.h>
-
-
-#define NO_LONGER_REQUIRED (1)
-
-/*
- * OnStream support
- */
-#define ONSTREAM_DEBUG (0)
-#define OS_CONFIG_PARTITION (0xff)
-#define OS_DATA_PARTITION (0)
-#define OS_PARTITION_VERSION (1)
-
-/*
- * partition
- */
-typedef struct os_partition_s {
- __u8 partition_num;
- __u8 par_desc_ver;
- __u16 wrt_pass_cntr;
- __u32 first_frame_addr;
- __u32 last_frame_addr;
- __u32 eod_frame_addr;
-} os_partition_t;
-
-/*
- * DAT entry
- */
-typedef struct os_dat_entry_s {
- __u32 blk_sz;
- __u16 blk_cnt;
- __u8 flags;
- __u8 reserved;
-} os_dat_entry_t;
-
-/*
- * DAT
- */
-#define OS_DAT_FLAGS_DATA (0xc)
-#define OS_DAT_FLAGS_MARK (0x1)
-
-typedef struct os_dat_s {
- __u8 dat_sz;
- __u8 reserved1;
- __u8 entry_cnt;
- __u8 reserved3;
- os_dat_entry_t dat_list[16];
-} os_dat_t;
-
-/*
- * Frame types
- */
-#define OS_FRAME_TYPE_FILL (0)
-#define OS_FRAME_TYPE_EOD (1 << 0)
-#define OS_FRAME_TYPE_MARKER (1 << 1)
-#define OS_FRAME_TYPE_HEADER (1 << 3)
-#define OS_FRAME_TYPE_DATA (1 << 7)
-
-/*
- * AUX
- */
-typedef struct os_aux_s {
- __u32 format_id; /* hardware compability AUX is based on */
- char application_sig[4]; /* driver used to write this media */
- __u32 hdwr; /* reserved */
- __u32 update_frame_cntr; /* for configuration frame */
- __u8 frame_type;
- __u8 frame_type_reserved;
- __u8 reserved_18_19[2];
- os_partition_t partition;
- __u8 reserved_36_43[8];
- __u32 frame_seq_num;
- __u32 logical_blk_num_high;
- __u32 logical_blk_num;
- os_dat_t dat;
- __u8 reserved188_191[4];
- __u32 filemark_cnt;
- __u32 phys_fm;
- __u32 last_mark_addr;
- __u8 reserved204_223[20];
-
- /*
- * __u8 app_specific[32];
- *
- * Linux specific fields:
- */
- __u32 next_mark_addr; /* when known, points to next marker */
- __u8 linux_specific[28];
-
- __u8 reserved_256_511[256];
-} os_aux_t;
-
-typedef struct os_header_s {
- char ident_str[8];
- __u8 major_rev;
- __u8 minor_rev;
- __u8 reserved10_15[6];
- __u8 par_num;
- __u8 reserved1_3[3];
- os_partition_t partition;
-} os_header_t;
-
-/*
- * OnStream ADRL frame
- */
-#define OS_FRAME_SIZE (32 * 1024 + 512)
-#define OS_DATA_SIZE (32 * 1024)
-#define OS_AUX_SIZE (512)
-
-#include <linux/mtio.h>
-
-/**************************** Tunable parameters *****************************/
-
-
-/*
- * Pipelined mode parameters.
- *
- * We try to use the minimum number of stages which is enough to
- * keep the tape constantly streaming. To accomplish that, we implement
- * a feedback loop around the maximum number of stages:
- *
- * We start from MIN maximum stages (we will not even use MIN stages
- * if we don't need them), increment it by RATE*(MAX-MIN)
- * whenever we sense that the pipeline is empty, until we reach
- * the optimum value or until we reach MAX.
- *
- * Setting the following parameter to 0 will disable the pipelined mode.
- */
-#define IDETAPE_MIN_PIPELINE_STAGES 200
-#define IDETAPE_MAX_PIPELINE_STAGES 400
-#define IDETAPE_INCREASE_STAGES_RATE 20
-
-/*
- * The following are used to debug the driver:
- *
- * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities.
- * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
- * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in
- * some places.
- *
- * Setting them to 0 will restore normal operation mode:
- *
- * 1. Disable logging normal successful operations.
- * 2. Disable self-sanity checks.
- * 3. Errors will still be logged, of course.
- *
- * All the #if DEBUG code will be removed some day, when the driver
- * is verified to be stable enough. This will make it much more
- * esthetic.
- */
-#define IDETAPE_DEBUG_INFO 0
-#define IDETAPE_DEBUG_LOG 1
-#define IDETAPE_DEBUG_LOG_VERBOSE 0
-#define IDETAPE_DEBUG_BUGS 1
-
-/*
- * After each failed packet command we issue a request sense command
- * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
- *
- * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
- */
-#define IDETAPE_MAX_PC_RETRIES 3
-
-/*
- * With each packet command, we allocate a buffer of
- * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
- * commands (Not for READ/WRITE commands).
- */
-#define IDETAPE_PC_BUFFER_SIZE 256
-
-/*
- * In various places in the driver, we need to allocate storage
- * for packet commands and requests, which will remain valid while
- * we leave the driver to wait for an interrupt or a timeout event.
- */
-#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
-
-/*
- * Some tape drives require a long irq timeout
- */
-#define IDETAPE_WAIT_CMD (60*HZ)
-
-/*
- * The following parameter is used to select the point in the internal
- * tape fifo in which we will start to refill the buffer. Decreasing
- * the following parameter will improve the system's latency and
- * interactive response, while using a high value might improve sytem
- * throughput.
- */
-#define IDETAPE_FIFO_THRESHOLD 2
-
-/*
- * DSC polling parameters.
- *
- * Polling for DSC (a single bit in the status register) is a very
- * important function in ide-tape. There are two cases in which we
- * poll for DSC:
- *
- * 1. Before a read/write packet command, to ensure that we
- * can transfer data from/to the tape's data buffers, without
- * causing an actual media access. In case the tape is not
- * ready yet, we take out our request from the device
- * request queue, so that ide.c will service requests from
- * the other device on the same interface meanwhile.
- *
- * 2. After the successful initialization of a "media access
- * packet command", which is a command which can take a long
- * time to complete (it can be several seconds or even an hour).
- *
- * Again, we postpone our request in the middle to free the bus
- * for the other device. The polling frequency here should be
- * lower than the read/write frequency since those media access
- * commands are slow. We start from a "fast" frequency -
- * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
- * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
- * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
- *
- * We also set a timeout for the timer, in case something goes wrong.
- * The timeout should be longer then the maximum execution time of a
- * tape operation.
- */
-
-/*
- * DSC timings.
- */
-#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
-#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
-#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
-#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
-#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
-#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
-#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
-
-/*************************** End of tunable parameters ***********************/
-
-/*
- * Debugging/Performance analysis
- *
- * I/O trace support
- */
-#define USE_IOTRACE 0
-#if USE_IOTRACE
-#include <linux/io_trace.h>
-#define IO_IDETAPE_FIFO 500
-#endif
-
-/*
- * Read/Write error simulation
- */
-#define SIMULATE_ERRORS 0
-
-/*
- * For general magnetic tape device compatibility.
- */
-typedef enum {
- idetape_direction_none,
- idetape_direction_read,
- idetape_direction_write
-} idetape_chrdev_direction_t;
-
-/*
- * Our view of a packet command.
- */
-typedef struct idetape_packet_command_s {
- u8 c[12]; /* Actual packet bytes */
- int retries; /* On each retry, we increment retries */
- int error; /* Error code */
- int request_transfer; /* Bytes to transfer */
- int actually_transferred; /* Bytes actually transferred */
- int buffer_size; /* Size of our data buffer */
- struct buffer_head *bh;
- char *b_data;
- int b_count;
- byte *buffer; /* Data buffer */
- byte *current_position; /* Pointer into the above buffer */
- ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
- byte pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
- unsigned int flags; /* Status/Action bit flags */
-} idetape_pc_t;
-
-/*
- * Packet command flag bits.
- */
-#define PC_ABORT 0 /* Set when an error is considered normal - We won't retry */
-#define PC_WAIT_FOR_DSC 1 /* 1 When polling for DSC on a media access command */
-#define PC_DMA_RECOMMENDED 2 /* 1 when we prefer to use DMA if possible */
-#define PC_DMA_IN_PROGRESS 3 /* 1 while DMA in progress */
-#define PC_DMA_ERROR 4 /* 1 when encountered problem during DMA */
-#define PC_WRITING 5 /* Data direction */
-
-/*
- * Capabilities and Mechanical Status Page
- */
-typedef struct {
- unsigned page_code :6; /* Page code - Should be 0x2a */
- __u8 reserved0_6 :1;
- __u8 ps :1; /* parameters saveable */
- __u8 page_length; /* Page Length - Should be 0x12 */
- __u8 reserved2, reserved3;
- unsigned ro :1; /* Read Only Mode */
- unsigned reserved4_1234 :4;
- unsigned sprev :1; /* Supports SPACE in the reverse direction */
- unsigned reserved4_67 :2;
- unsigned reserved5_012 :3;
- unsigned efmt :1; /* Supports ERASE command initiated formatting */
- unsigned reserved5_4 :1;
- unsigned qfa :1; /* Supports the QFA two partition formats */
- unsigned reserved5_67 :2;
- unsigned lock :1; /* Supports locking the volume */
- unsigned locked :1; /* The volume is locked */
- unsigned prevent :1; /* The device defaults in the prevent state after power up */
- unsigned eject :1; /* The device can eject the volume */
- __u8 disconnect :1; /* The device can break request > ctl */
- __u8 reserved6_5 :1;
- unsigned ecc :1; /* Supports error correction */
- unsigned cmprs :1; /* Supports data compression */
- unsigned reserved7_0 :1;
- unsigned blk512 :1; /* Supports 512 bytes block size */
- unsigned blk1024 :1; /* Supports 1024 bytes block size */
- unsigned reserved7_3_6 :4;
- unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
- /* transfers for slow buffer memory ??? */
- /* Also 32768 block size in some cases */
- __u16 max_speed; /* Maximum speed supported in KBps */
- __u8 reserved10, reserved11;
- __u16 ctl; /* Continuous Transfer Limit in blocks */
- __u16 speed; /* Current Speed, in KBps */
- __u16 buffer_size; /* Buffer Size, in 512 bytes */
- __u8 reserved18, reserved19;
-} idetape_capabilities_page_t;
-
-/*
- * Block Size Page
- */
-typedef struct {
- unsigned page_code :6; /* Page code - Should be 0x30 */
- unsigned reserved1_6 :1;
- unsigned ps :1;
- __u8 page_length; /* Page Length - Should be 2 */
- __u8 reserved2;
- unsigned play32 :1;
- unsigned play32_5 :1;
- unsigned reserved2_23 :2;
- unsigned record32 :1;
- unsigned record32_5 :1;
- unsigned reserved2_6 :1;
- unsigned one :1;
-} idetape_block_size_page_t;
-
-/*
- * A pipeline stage.
- */
-typedef struct idetape_stage_s {
- struct request rq; /* The corresponding request */
- struct buffer_head *bh; /* The data buffers */
- struct idetape_stage_s *next; /* Pointer to the next stage */
- os_aux_t *aux; /* OnStream aux ptr */
-} idetape_stage_t;
-
-/*
- * REQUEST SENSE packet command result - Data Format.
- */
-typedef struct {
- unsigned error_code :7; /* Current of deferred errors */
- unsigned valid :1; /* The information field conforms to QIC-157C */
- __u8 reserved1 :8; /* Segment Number - Reserved */
- unsigned sense_key :4; /* Sense Key */
- unsigned reserved2_4 :1; /* Reserved */
- unsigned ili :1; /* Incorrect Length Indicator */
- unsigned eom :1; /* End Of Medium */
- unsigned filemark :1; /* Filemark */
- __u32 information __attribute__ ((packed));
- __u8 asl; /* Additional sense length (n-7) */
- __u32 command_specific; /* Additional command specific information */
- __u8 asc; /* Additional Sense Code */
- __u8 ascq; /* Additional Sense Code Qualifier */
- __u8 replaceable_unit_code; /* Field Replaceable Unit Code */
- unsigned sk_specific1 :7; /* Sense Key Specific */
- unsigned sksv :1; /* Sense Key Specific information is valid */
- __u8 sk_specific2; /* Sense Key Specific */
- __u8 sk_specific3; /* Sense Key Specific */
- __u8 pad[2]; /* Padding to 20 bytes */
-} idetape_request_sense_result_t;
-
-
-/*
- * Most of our global data which we need to save even as we leave the
- * driver due to an interrupt or a timer event is stored in a variable
- * of type idetape_tape_t, defined below.
- */
-typedef struct {
- ide_drive_t *drive;
- devfs_handle_t de_r, de_n;
-
- /*
- * Since a typical character device operation requires more
- * than one packet command, we provide here enough memory
- * for the maximum of interconnected packet commands.
- * The packet commands are stored in the circular array pc_stack.
- * pc_stack_index points to the last used entry, and warps around
- * to the start when we get to the last array entry.
- *
- * pc points to the current processed packet command.
- *
- * failed_pc points to the last failed packet command, or contains
- * NULL if we do not need to retry any packet command. This is
- * required since an additional packet command is needed before the
- * retry, to get detailed information on what went wrong.
- */
- idetape_pc_t *pc; /* Current packet command */
- idetape_pc_t *failed_pc; /* Last failed packet command */
- idetape_pc_t pc_stack[IDETAPE_PC_STACK];/* Packet command stack */
- int pc_stack_index; /* Next free packet command storage space */
- struct request rq_stack[IDETAPE_PC_STACK];
- int rq_stack_index; /* We implement a circular array */
-
- /*
- * DSC polling variables.
- *
- * While polling for DSC we use postponed_rq to postpone the
- * current request so that ide.c will be able to service
- * pending requests on the other device. Note that at most
- * we will have only one DSC (usually data transfer) request
- * in the device request queue. Additional requests can be
- * queued in our internal pipeline, but they will be visible
- * to ide.c only one at a time.
- */
- struct request *postponed_rq;
- unsigned long dsc_polling_start; /* The time in which we started polling for DSC */
- struct timer_list dsc_timer; /* Timer used to poll for dsc */
- unsigned long best_dsc_rw_frequency; /* Read/Write dsc polling frequency */
- unsigned long dsc_polling_frequency; /* The current polling frequency */
- unsigned long dsc_timeout; /* Maximum waiting time */
-
- /*
- * Read position information
- */
- byte partition;
- unsigned int first_frame_position; /* Current block */
- unsigned int last_frame_position;
- unsigned int blocks_in_buffer;
-
- /*
- * Last error information
- */
- byte sense_key, asc, ascq;
-
- /*
- * Character device operation
- */
- unsigned int minor;
- char name[4]; /* device name */
- idetape_chrdev_direction_t chrdev_direction; /* Current character device data transfer direction */
-
- /*
- * Device information
- */
- unsigned short tape_block_size; /* Usually 512 or 1024 bytes */
- int user_bs_factor;
- idetape_capabilities_page_t capabilities; /* Copy of the tape's Capabilities and Mechanical Page */
-
- /*
- * Active data transfer request parameters.
- *
- * At most, there is only one ide-tape originated data transfer
- * request in the device request queue. This allows ide.c to
- * easily service requests from the other device when we
- * postpone our active request. In the pipelined operation
- * mode, we use our internal pipeline structure to hold
- * more data requests.
- *
- * The data buffer size is chosen based on the tape's
- * recommendation.
- */
- struct request *active_data_request; /* Pointer to the request which is waiting in the device request queue */
- int stage_size; /* Data buffer size (chosen based on the tape's recommendation */
- idetape_stage_t *merge_stage;
- int merge_stage_size;
- struct buffer_head *bh;
- char *b_data;
- int b_count;
-
- /*
- * Pipeline parameters.
- *
- * To accomplish non-pipelined mode, we simply set the following
- * variables to zero (or NULL, where appropriate).
- */
- int nr_stages; /* Number of currently used stages */
- int nr_pending_stages; /* Number of pending stages */
- int max_stages, min_pipeline, max_pipeline; /* We will not allocate more than this number of stages */
- idetape_stage_t *first_stage; /* The first stage which will be removed from the pipeline */
- idetape_stage_t *active_stage; /* The currently active stage */
- idetape_stage_t *next_stage; /* Will be serviced after the currently active request */
- idetape_stage_t *last_stage; /* New requests will be added to the pipeline here */
- idetape_stage_t *cache_stage; /* Optional free stage which we can use */
- int pages_per_stage;
- int excess_bh_size; /* Wasted space in each stage */
-
- unsigned int flags; /* Status/Action flags */
- spinlock_t spinlock; /* protects the ide-tape queue */
-
- /*
- * Measures average tape speed
- */
- unsigned long avg_time;
- int avg_size;
- int avg_speed;
-
- idetape_request_sense_result_t sense; /* last sense information */
-
- char vendor_id[10];
- char product_id[18];
- char firmware_revision[6];
- int firmware_revision_num;
-
- int door_locked; /* the door is currently locked */
-
- /*
- * OnStream flags
- */
- int onstream; /* the tape is an OnStream tape */
- int raw; /* OnStream raw access (32.5KB block size) */
- int cur_frames; /* current number of frames in internal buffer */
- int max_frames; /* max number of frames in internal buffer */
- int logical_blk_num; /* logical block number */
- __u16 wrt_pass_cntr; /* write pass counter */
- __u32 update_frame_cntr; /* update frame counter */
- struct semaphore *sem;
- int onstream_write_error; /* write error recovery active */
- int header_ok; /* header frame verified ok */
- int linux_media; /* reading linux-specifc media */
- int linux_media_version;
- char application_sig[5]; /* application signature */
- int filemark_cnt;
- int first_mark_addr;
- int last_mark_addr;
- int eod_frame_addr;
- unsigned long cmd_start_time;
- unsigned long max_cmd_time;
-
- /*
- * Optimize the number of "buffer filling"
- * mode sense commands.
- */
- unsigned long last_buffer_fill; /* last time in which we issued fill cmd */
- int req_buffer_fill; /* buffer fill command requested */
- int writes_since_buffer_fill;
- int reads_since_buffer_fill;
-
- /*
- * Limit the number of times a request can
- * be postponed, to avoid an infinite postpone
- * deadlock.
- */
- int postpone_cnt; /* request postpone count limit */
-
- /*
- * Measures number of frames:
- *
- * 1. written/read to/from the driver pipeline (pipeline_head).
- * 2. written/read to/from the tape buffers (buffer_head).
- * 3. written/read by the tape to/from the media (tape_head).
- */
- int pipeline_head;
- int buffer_head;
- int tape_head;
- int last_tape_head;
-
- /*
- * Speed control at the tape buffers input/output
- */
- unsigned long insert_time;
- int insert_size;
- int insert_speed;
- int max_insert_speed;
- int measure_insert_time;
-
- /*
- * Measure tape still time, in milliseconds
- */
- unsigned long tape_still_time_begin;
- int tape_still_time;
-
- /*
- * Speed regulation negative feedback loop
- */
- int speed_control;
- int pipeline_head_speed, controlled_pipeline_head_speed, uncontrolled_pipeline_head_speed;
- int controlled_last_pipeline_head, uncontrolled_last_pipeline_head;
- unsigned long uncontrolled_pipeline_head_time, controlled_pipeline_head_time;
- int controlled_previous_pipeline_head, uncontrolled_previous_pipeline_head;
- unsigned long controlled_previous_head_time, uncontrolled_previous_head_time;
- int restart_speed_control_req;
-
- /*
- * Debug_level determines amount of debugging output;
- * can be changed using /proc/ide/hdx/settings
- * 0 : almost no debugging output
- * 1 : 0+output errors only
- * 2 : 1+output all sensekey/asc
- * 3 : 2+follow all chrdev related procedures
- * 4 : 3+follow all procedures
- * 5 : 4+include pc_stack rq_stack info
- * 6 : 5+USE_COUNT updates
- */
- int debug_level;
-} idetape_tape_t;
-
-/*
- * Tape door status
- */
-#define DOOR_UNLOCKED 0
-#define DOOR_LOCKED 1
-#define DOOR_EXPLICITLY_LOCKED 2
-
-/*
- * Tape flag bits values.
- */
-#define IDETAPE_IGNORE_DSC 0
-#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
-#define IDETAPE_BUSY 2 /* Device already opened */
-#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
-#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
-#define IDETAPE_FILEMARK 5 /* Currently on a filemark */
-#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
-#define IDETAPE_READ_ERROR 7
-#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
-
-/*
- * Supported ATAPI tape drives packet commands
- */
-#define IDETAPE_TEST_UNIT_READY_CMD 0x00
-#define IDETAPE_REWIND_CMD 0x01
-#define IDETAPE_REQUEST_SENSE_CMD 0x03
-#define IDETAPE_READ_CMD 0x08
-#define IDETAPE_WRITE_CMD 0x0a
-#define IDETAPE_WRITE_FILEMARK_CMD 0x10
-#define IDETAPE_SPACE_CMD 0x11
-#define IDETAPE_INQUIRY_CMD 0x12
-#define IDETAPE_ERASE_CMD 0x19
-#define IDETAPE_MODE_SENSE_CMD 0x1a
-#define IDETAPE_MODE_SELECT_CMD 0x15
-#define IDETAPE_LOAD_UNLOAD_CMD 0x1b
-#define IDETAPE_PREVENT_CMD 0x1e
-#define IDETAPE_LOCATE_CMD 0x2b
-#define IDETAPE_READ_POSITION_CMD 0x34
-#define IDETAPE_READ_BUFFER_CMD 0x3c
-#define IDETAPE_SET_SPEED_CMD 0xbb
-
-/*
- * Some defines for the READ BUFFER command
- */
-#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
-
-/*
- * Some defines for the SPACE command
- */
-#define IDETAPE_SPACE_OVER_FILEMARK 1
-#define IDETAPE_SPACE_TO_EOD 3
-
-/*
- * Some defines for the LOAD UNLOAD command
- */
-#define IDETAPE_LU_LOAD_MASK 1
-#define IDETAPE_LU_RETENSION_MASK 2
-#define IDETAPE_LU_EOT_MASK 4
-
-/*
- * Special requests for our block device strategy routine.
- *
- * In order to service a character device command, we add special
- * requests to the tail of our block device request queue and wait
- * for their completion.
- *
- */
-#define IDETAPE_FIRST_RQ 90
-
-/*
- * IDETAPE_PC_RQ is used to queue a packet command in the request queue.
- */
-#define IDETAPE_PC_RQ1 90
-#define IDETAPE_PC_RQ2 91
-
-/*
- * IDETAPE_READ_RQ and IDETAPE_WRITE_RQ are used by our
- * character device interface to request read/write operations from
- * our block device interface.
- */
-#define IDETAPE_READ_RQ 92
-#define IDETAPE_WRITE_RQ 93
-#define IDETAPE_ABORTED_WRITE_RQ 94
-#define IDETAPE_ABORTED_READ_RQ 95
-#define IDETAPE_READ_BUFFER_RQ 96
-
-#define IDETAPE_LAST_RQ 96
-
-/*
- * A macro which can be used to check if a we support a given
- * request command.
- */
-#define IDETAPE_RQ_CMD(cmd) ((cmd >= IDETAPE_FIRST_RQ) && (cmd <= IDETAPE_LAST_RQ))
-
-/*
- * Error codes which are returned in rq->errors to the higher part
- * of the driver.
- */
-#define IDETAPE_ERROR_GENERAL 101
-#define IDETAPE_ERROR_FILEMARK 102
-#define IDETAPE_ERROR_EOD 103
-
-/*
- * The ATAPI Status Register.
- */
-typedef union {
- unsigned all :8;
- struct {
- unsigned check :1; /* Error occurred */
- unsigned idx :1; /* Reserved */
- unsigned corr :1; /* Correctable error occurred */
- unsigned drq :1; /* Data is request by the device */
- unsigned dsc :1; /* Buffer availability / Media access command finished */
- unsigned reserved5 :1; /* Reserved */
- unsigned drdy :1; /* Ignored for ATAPI commands (ready to accept ATA command) */
- unsigned bsy :1; /* The device has access to the command block */
- } b;
-} idetape_status_reg_t;
-
-/*
- * The ATAPI error register.
- */
-typedef union {
- unsigned all :8;
- struct {
- unsigned ili :1; /* Illegal Length Indication */
- unsigned eom :1; /* End Of Media Detected */
- unsigned abrt :1; /* Aborted command - As defined by ATA */
- unsigned mcr :1; /* Media Change Requested - As defined by ATA */
- unsigned sense_key :4; /* Sense key of the last failed packet command */
- } b;
-} idetape_error_reg_t;
-
-/*
- * ATAPI Feature Register
- */
-typedef union {
- unsigned all :8;
- struct {
- unsigned dma :1; /* Using DMA of PIO */
- unsigned reserved321 :3; /* Reserved */
- unsigned reserved654 :3; /* Reserved (Tag Type) */
- unsigned reserved7 :1; /* Reserved */
- } b;
-} idetape_feature_reg_t;
-
-/*
- * ATAPI Byte Count Register.
- */
-typedef union {
- unsigned all :16;
- struct {
- unsigned low :8; /* LSB */
- unsigned high :8; /* MSB */
- } b;
-} idetape_bcount_reg_t;
-
-/*
- * ATAPI Interrupt Reason Register.
- */
-typedef union {
- unsigned all :8;
- struct {
- unsigned cod :1; /* Information transferred is command (1) or data (0) */
- unsigned io :1; /* The device requests us to read (1) or write (0) */
- unsigned reserved :6; /* Reserved */
- } b;
-} idetape_ireason_reg_t;
-
-/*
- * ATAPI Drive Select Register
- */
-typedef union {
- unsigned all :8;
- struct {
- unsigned sam_lun :4; /* Should be zero with ATAPI (not used) */
- unsigned drv :1; /* The responding drive will be drive 0 (0) or drive 1 (1) */
- unsigned one5 :1; /* Should be set to 1 */
- unsigned reserved6 :1; /* Reserved */
- unsigned one7 :1; /* Should be set to 1 */
- } b;
-} idetape_drivesel_reg_t;
-
-/*
- * ATAPI Device Control Register
- */
-typedef union {
- unsigned all :8;
- struct {
- unsigned zero0 :1; /* Should be set to zero */
- unsigned nien :1; /* Device interrupt is disabled (1) or enabled (0) */
- unsigned srst :1; /* ATA software reset. ATAPI devices should use the new ATAPI srst. */
- unsigned one3 :1; /* Should be set to 1 */
- unsigned reserved4567 :4; /* Reserved */
- } b;
-} idetape_control_reg_t;
-
-/*
- * idetape_chrdev_t provides the link between out character device
- * interface and our block device interface and the corresponding
- * ide_drive_t structure.
- */
-typedef struct {
- ide_drive_t *drive;
-} idetape_chrdev_t;
-
-/*
- * The following is used to format the general configuration word of
- * the ATAPI IDENTIFY DEVICE command.
- */
-struct idetape_id_gcw {
- unsigned packet_size :2; /* Packet Size */
- unsigned reserved234 :3; /* Reserved */
- unsigned drq_type :2; /* Command packet DRQ type */
- unsigned removable :1; /* Removable media */
- unsigned device_type :5; /* Device type */
- unsigned reserved13 :1; /* Reserved */
- unsigned protocol :2; /* Protocol type */
-};
-
-/*
- * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
- */
-typedef struct {
- unsigned device_type :5; /* Peripheral Device Type */
- unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
- unsigned reserved1_6t0 :7; /* Reserved */
- unsigned rmb :1; /* Removable Medium Bit */
- unsigned ansi_version :3; /* ANSI Version */
- unsigned ecma_version :3; /* ECMA Version */
- unsigned iso_version :2; /* ISO Version */
- unsigned response_format :4; /* Response Data Format */
- unsigned reserved3_45 :2; /* Reserved */
- unsigned reserved3_6 :1; /* TrmIOP - Reserved */
- unsigned reserved3_7 :1; /* AENC - Reserved */
- __u8 additional_length; /* Additional Length (total_length-4) */
- __u8 rsv5, rsv6, rsv7; /* Reserved */
- __u8 vendor_id[8]; /* Vendor Identification */
- __u8 product_id[16]; /* Product Identification */
- __u8 revision_level[4]; /* Revision Level */
- __u8 vendor_specific[20]; /* Vendor Specific - Optional */
- __u8 reserved56t95[40]; /* Reserved - Optional */
- /* Additional information may be returned */
-} idetape_inquiry_result_t;
-
-/*
- * READ POSITION packet command - Data Format (From Table 6-57)
- */
-typedef struct {
- unsigned reserved0_10 :2; /* Reserved */
- unsigned bpu :1; /* Block Position Unknown */
- unsigned reserved0_543 :3; /* Reserved */
- unsigned eop :1; /* End Of Partition */
- unsigned bop :1; /* Beginning Of Partition */
- u8 partition; /* Partition Number */
- u8 reserved2, reserved3; /* Reserved */
- u32 first_block; /* First Block Location */
- u32 last_block; /* Last Block Location (Optional) */
- u8 reserved12; /* Reserved */
- u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
- u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
-} idetape_read_position_result_t;
-
-/*
- * Follows structures which are related to the SELECT SENSE / MODE SENSE
- * packet commands. Those packet commands are still not supported
- * by ide-tape.
- */
-#define IDETAPE_CAPABILITIES_PAGE 0x2a
-#define IDETAPE_BLOCK_SIZE_PAGE 0x30
-
-/*
- * Mode Parameter Header for the MODE SENSE packet command
- */
-typedef struct {
- __u8 mode_data_length; /* Length of the following data transfer */
- __u8 medium_type; /* Medium Type */
- __u8 dsp; /* Device Specific Parameter */
- __u8 bdl; /* Block Descriptor Length */
-#if 0
- /* data transfer page */
- __u8 page_code :6;
- __u8 reserved0_6 :1;
- __u8 ps :1; /* parameters saveable */
- __u8 page_length; /* page Length == 0x02 */
- __u8 reserved2;
- __u8 read32k :1; /* 32k blk size (data only) */
- __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */
- __u8 reserved3_23 :2;
- __u8 write32k :1; /* 32k blk size (data only) */
- __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */
- __u8 reserved3_6 :1;
- __u8 streaming :1; /* streaming mode enable */
-#endif
-} idetape_mode_parameter_header_t;
-
-/*
- * Mode Parameter Block Descriptor the MODE SENSE packet command
- *
- * Support for block descriptors is optional.
- */
-typedef struct {
- __u8 density_code; /* Medium density code */
- __u8 blocks[3]; /* Number of blocks */
- __u8 reserved4; /* Reserved */
- __u8 length[3]; /* Block Length */
-} idetape_parameter_block_descriptor_t;
-
-/*
- * The Data Compression Page, as returned by the MODE SENSE packet command.
- */
-typedef struct {
- unsigned page_code :6; /* Page Code - Should be 0xf */
- unsigned reserved0 :1; /* Reserved */
- unsigned ps :1;
- __u8 page_length; /* Page Length - Should be 14 */
- unsigned reserved2 :6; /* Reserved */
- unsigned dcc :1; /* Data Compression Capable */
- unsigned dce :1; /* Data Compression Enable */
- unsigned reserved3 :5; /* Reserved */
- unsigned red :2; /* Report Exception on Decompression */
- unsigned dde :1; /* Data Decompression Enable */
- __u32 ca; /* Compression Algorithm */
- __u32 da; /* Decompression Algorithm */
- __u8 reserved[4]; /* Reserved */
-} idetape_data_compression_page_t;
-
-/*
- * The Medium Partition Page, as returned by the MODE SENSE packet command.
- */
-typedef struct {
- unsigned page_code :6; /* Page Code - Should be 0x11 */
- unsigned reserved1_6 :1; /* Reserved */
- unsigned ps :1;
- __u8 page_length; /* Page Length - Should be 6 */
- __u8 map; /* Maximum Additional Partitions - Should be 0 */
- __u8 apd; /* Additional Partitions Defined - Should be 0 */
- unsigned reserved4_012 :3; /* Reserved */
- unsigned psum :2; /* Should be 0 */
- unsigned idp :1; /* Should be 0 */
- unsigned sdp :1; /* Should be 0 */
- unsigned fdp :1; /* Fixed Data Partitions */
- __u8 mfr; /* Medium Format Recognition */
- __u8 reserved[2]; /* Reserved */
-} idetape_medium_partition_page_t;
-
-/*
- * Run time configurable parameters.
- */
-typedef struct {
- int dsc_rw_frequency;
- int dsc_media_access_frequency;
- int nr_stages;
-} idetape_config_t;
-
-/*
- * The variables below are used for the character device interface.
- * Additional state variables are defined in our ide_drive_t structure.
- */
-static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES];
-static int idetape_chrdev_present = 0;
-
-#if IDETAPE_DEBUG_LOG_VERBOSE
-
-/*
- * DO NOT REMOVE, BUILDING A VERBOSE DEBUG SCHEME FOR ATAPI
- */
-
-char *idetape_sense_key_verbose (byte idetape_sense_key)
-{
- switch (idetape_sense_key) {
- default: {
- char buf[22];
- sprintf(buf, "IDETAPE_SENSE (0x%02x)", idetape_sense_key);
- return(buf);
- }
-
- }
-}
-
-char *idetape_command_key_verbose (byte idetape_command_key)
-{
- switch (idetape_command_key) {
- case IDETAPE_TEST_UNIT_READY_CMD: return("TEST_UNIT_READY_CMD");
- case IDETAPE_REWIND_CMD: return("REWIND_CMD");
- case IDETAPE_REQUEST_SENSE_CMD: return("REQUEST_SENSE_CMD");
- case IDETAPE_READ_CMD: return("READ_CMD");
- case IDETAPE_WRITE_CMD: return("WRITE_CMD");
- case IDETAPE_WRITE_FILEMARK_CMD: return("WRITE_FILEMARK_CMD");
- case IDETAPE_SPACE_CMD: return("SPACE_CMD");
- case IDETAPE_INQUIRY_CMD: return("INQUIRY_CMD");
- case IDETAPE_ERASE_CMD: return("ERASE_CMD")
- case IDETAPE_MODE_SENSE_CMD: return("MODE_SENSE_CMD");
- case IDETAPE_MODE_SELECT_CMD: return("MODE_SELECT_CMD");
- case IDETAPE_LOAD_UNLOAD_CMD: return("LOAD_UNLOAD_CMD");
- case IDETAPE_PREVENT_CMD: return("PREVENT_CMD");
- case IDETAPE_LOCATE_CMD: return("LOCATE_CMD");
- case IDETAPE_READ_POSITION_CMD: return("READ_POSITION_CMD");
- case IDETAPE_READ_BUFFER_CMD: return("READ_BUFFER_CMD");
- case IDETAPE_SET_SPEED_CMD: return("SET_SPEED_CMD");
- default: {
- char buf[20];
- sprintf(buf, "CMD (0x%02x)", idetape_command_key);
- return(buf);
- }
- }
-}
-#endif /* IDETAPE_DEBUG_LOG_VERBOSE */
-
-/*
- * Too bad. The drive wants to send us data which we are not ready to accept.
- * Just throw it away.
- */
-static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
-{
- while (bcount--)
- IN_BYTE (IDE_DATA_REG);
-}
-
-static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
-{
- struct buffer_head *bh = pc->bh;
- int count;
-
- while (bcount) {
-#if IDETAPE_DEBUG_BUGS
- if (bh == NULL) {
- printk (KERN_ERR "ide-tape: bh == NULL in idetape_input_buffers\n");
- idetape_discard_data (drive, bcount);
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- count = IDE_MIN (bh->b_size - atomic_read(&bh->b_count), bcount);
- atapi_input_bytes (drive, bh->b_data + atomic_read(&bh->b_count), count);
- bcount -= count; atomic_add(count, &bh->b_count);
- if (atomic_read(&bh->b_count) == bh->b_size) {
- bh = bh->b_reqnext;
- if (bh)
- atomic_set(&bh->b_count, 0);
- }
- }
- pc->bh = bh;
-}
-
-static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
-{
- struct buffer_head *bh = pc->bh;
- int count;
-
- while (bcount) {
-#if IDETAPE_DEBUG_BUGS
- if (bh == NULL) {
- printk (KERN_ERR "ide-tape: bh == NULL in idetape_output_buffers\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- count = IDE_MIN (pc->b_count, bcount);
- atapi_output_bytes (drive, pc->b_data, count);
- bcount -= count; pc->b_data += count; pc->b_count -= count;
- if (!pc->b_count) {
- pc->bh = bh = bh->b_reqnext;
- if (bh) {
- pc->b_data = bh->b_data;
- pc->b_count = atomic_read(&bh->b_count);
- }
- }
- }
-}
-
-#ifdef CONFIG_BLK_DEV_IDEDMA
-static void idetape_update_buffers (idetape_pc_t *pc)
-{
- struct buffer_head *bh = pc->bh;
- int count, bcount = pc->actually_transferred;
-
- if (test_bit (PC_WRITING, &pc->flags))
- return;
- while (bcount) {
-#if IDETAPE_DEBUG_BUGS
- if (bh == NULL) {
- printk (KERN_ERR "ide-tape: bh == NULL in idetape_update_buffers\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- count = IDE_MIN (bh->b_size, bcount);
- atomic_set(&bh->b_count, count);
- if (atomic_read(&bh->b_count) == bh->b_size)
- bh = bh->b_reqnext;
- bcount -= count;
- }
- pc->bh = bh;
-}
-#endif /* CONFIG_BLK_DEV_IDEDMA */
-
-/*
- * idetape_next_pc_storage returns a pointer to a place in which we can
- * safely store a packet command, even though we intend to leave the
- * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
- * commands is allocated at initialization time.
- */
-static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 5)
- printk (KERN_INFO "ide-tape: pc_stack_index=%d\n",tape->pc_stack_index);
-#endif /* IDETAPE_DEBUG_LOG */
- if (tape->pc_stack_index==IDETAPE_PC_STACK)
- tape->pc_stack_index=0;
- return (&tape->pc_stack[tape->pc_stack_index++]);
-}
-
-/*
- * idetape_next_rq_storage is used along with idetape_next_pc_storage.
- * Since we queue packet commands in the request queue, we need to
- * allocate a request, along with the allocation of a packet command.
- */
-
-/**************************************************************
- * *
- * This should get fixed to use kmalloc(GFP_ATOMIC, ..) *
- * followed later on by kfree(). -ml *
- * *
- **************************************************************/
-
-static struct request *idetape_next_rq_storage (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 5)
- printk (KERN_INFO "ide-tape: rq_stack_index=%d\n",tape->rq_stack_index);
-#endif /* IDETAPE_DEBUG_LOG */
- if (tape->rq_stack_index==IDETAPE_PC_STACK)
- tape->rq_stack_index=0;
- return (&tape->rq_stack[tape->rq_stack_index++]);
-}
-
-/*
- * idetape_init_pc initializes a packet command.
- */
-static void idetape_init_pc (idetape_pc_t *pc)
-{
- memset (pc->c, 0, 12);
- pc->retries = 0;
- pc->flags = 0;
- pc->request_transfer = 0;
- pc->buffer = pc->pc_buffer;
- pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
- pc->bh = NULL;
- pc->b_data = NULL;
-}
-
-/*
- * idetape_analyze_error is called on each failed packet command retry
- * to analyze the request sense. We currently do not utilize this
- * information.
- */
-static void idetape_analyze_error (ide_drive_t *drive,idetape_request_sense_result_t *result)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t *pc = tape->failed_pc;
-
- tape->sense = *result;
- tape->sense_key = result->sense_key; tape->asc = result->asc; tape->ascq = result->ascq;
-#if IDETAPE_DEBUG_LOG
- /*
- * Without debugging, we only log an error if we decided to
- * give up retrying.
- */
- if (tape->debug_level >= 1)
- printk (KERN_INFO "ide-tape: pc = %x, sense key = %x, asc = %x, ascq = %x\n",pc->c[0],result->sense_key,result->asc,result->ascq);
-#if IDETAPE_DEBUG_LOG_VERBOSE
- if (tape->debug_level >= 1)
- printk (KERN_INFO "ide-tape: pc = %s, sense key = %x, asc = %x, ascq = %x\n",
- idetape_command_key_verbose((byte) pc->c[0]),
- result->sense_key,
- result->asc,
- result->ascq);
-#endif /* IDETAPE_DEBUG_LOG_VERBOSE */
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->onstream && result->sense_key == 2 && result->asc == 0x53 && result->ascq == 2) {
- clear_bit(PC_DMA_ERROR, &pc->flags);
- ide_stall_queue(drive, HZ / 2);
- return;
- }
-#ifdef CONFIG_BLK_DEV_IDEDMA
-
- /*
- * Correct pc->actually_transferred by asking the tape.
- */
- if (test_bit (PC_DMA_ERROR, &pc->flags)) {
- pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl (get_unaligned (&result->information));
- idetape_update_buffers (pc);
- }
-#endif /* CONFIG_BLK_DEV_IDEDMA */
- if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
- pc->error = IDETAPE_ERROR_FILEMARK;
- set_bit (PC_ABORT, &pc->flags);
- }
- if (pc->c[0] == IDETAPE_WRITE_CMD) {
- if (result->eom || (result->sense_key == 0xd && result->asc == 0x0 && result->ascq == 0x2)) {
- pc->error = IDETAPE_ERROR_EOD;
- set_bit (PC_ABORT, &pc->flags);
- }
- }
- if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
- if (result->sense_key == 8) {
- pc->error = IDETAPE_ERROR_EOD;
- set_bit (PC_ABORT, &pc->flags);
- }
- if (!test_bit (PC_ABORT, &pc->flags) && (tape->onstream || pc->actually_transferred))
- pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
- }
-}
-
-static void idetape_abort_pipeline (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage = tape->next_stage;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
-#endif
- while (stage) {
- if (stage->rq.cmd == IDETAPE_WRITE_RQ)
- stage->rq.cmd = IDETAPE_ABORTED_WRITE_RQ;
- else if (stage->rq.cmd == IDETAPE_READ_RQ)
- stage->rq.cmd = IDETAPE_ABORTED_READ_RQ;
- stage = stage->next;
- }
-}
-
-/*
- * idetape_active_next_stage will declare the next stage as "active".
- */
-static void idetape_active_next_stage (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage=tape->next_stage;
- struct request *rq = &stage->rq;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
-#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (stage == NULL) {
- printk (KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- rq->buffer = NULL;
- rq->bh = stage->bh;
- tape->active_data_request=rq;
- tape->active_stage=stage;
- tape->next_stage=stage->next;
-}
-
-/*
- * idetape_increase_max_pipeline_stages is a part of the feedback
- * loop which tries to find the optimum number of stages. In the
- * feedback loop, we are starting from a minimum maximum number of
- * stages, and if we sense that the pipeline is empty, we try to
- * increase it, until we reach the user compile time memory limit.
- */
-static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- tape->max_stages += increase;
- tape->max_stages = IDE_MAX(tape->max_stages, tape->min_pipeline);
- tape->max_stages = IDE_MIN(tape->max_stages, tape->max_pipeline);
-}
-
-/*
- * idetape_kfree_stage calls kfree to completely free a stage, along with
- * its related buffers.
- */
-static void __idetape_kfree_stage (idetape_stage_t *stage)
-{
- struct buffer_head *prev_bh, *bh = stage->bh;
- int size;
-
- while (bh != NULL) {
- if (bh->b_data != NULL) {
- size = (int) bh->b_size;
- while (size > 0) {
- free_page ((unsigned long) bh->b_data);
- size -= PAGE_SIZE;
- bh->b_data += PAGE_SIZE;
- }
- }
- prev_bh = bh;
- bh = bh->b_reqnext;
- kfree (prev_bh);
- }
- kfree (stage);
-}
-
-static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
-{
- __idetape_kfree_stage (stage);
-}
-
-/*
- * idetape_remove_stage_head removes tape->first_stage from the pipeline.
- * The caller should avoid race conditions.
- */
-static void idetape_remove_stage_head (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
-#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (tape->first_stage == NULL) {
- printk (KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
- return;
- }
- if (tape->active_stage == tape->first_stage) {
- printk (KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- stage=tape->first_stage;
- tape->first_stage=stage->next;
- idetape_kfree_stage (tape, stage);
- tape->nr_stages--;
- if (tape->first_stage == NULL) {
- tape->last_stage=NULL;
-#if IDETAPE_DEBUG_BUGS
- if (tape->next_stage != NULL)
- printk (KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
- if (tape->nr_stages)
- printk (KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
-#endif /* IDETAPE_DEBUG_BUGS */
- }
-}
-
-/*
- * idetape_end_request is used to finish servicing a request, and to
- * insert a pending pipeline request into the main device queue.
- */
-static void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
-{
- ide_drive_t *drive = hwgroup->drive;
- struct request *rq = hwgroup->rq;
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- int error;
- int remove_stage = 0;
-#if ONSTREAM_DEBUG
- idetape_stage_t *stage;
- os_aux_t *aux;
- unsigned char *p;
-#endif
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_end_request\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- switch (uptodate) {
- case 0: error = IDETAPE_ERROR_GENERAL; break;
- case 1: error = 0; break;
- default: error = uptodate;
- }
- rq->errors = error;
- if (error)
- tape->failed_pc = NULL;
-
- spin_lock_irqsave(&tape->spinlock, flags);
- if (tape->active_data_request == rq) { /* The request was a pipelined data transfer request */
- tape->active_stage = NULL;
- tape->active_data_request = NULL;
- tape->nr_pending_stages--;
- if (rq->cmd == IDETAPE_WRITE_RQ) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2) {
- if (tape->onstream) {
- stage = tape->first_stage;
- aux = stage->aux;
- p = stage->bh->b_data;
- if (ntohl(aux->logical_blk_num) < 11300 && ntohl(aux->logical_blk_num) > 11100)
- printk(KERN_INFO "ide-tape: finished writing logical blk %u (data %x %x %x %x)\n", ntohl(aux->logical_blk_num), *p++, *p++, *p++, *p++);
- }
- }
-#endif
- if (tape->onstream && !tape->raw) {
- if (tape->first_frame_position == 0xba4) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk("ide-tape: %s: skipping over config parition..\n", tape->name);
-#endif
- tape->onstream_write_error = 2;
- if (tape->sem)
- up(tape->sem);
- }
- }
- remove_stage = 1;
- if (error) {
- set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
- if (error == IDETAPE_ERROR_EOD)
- idetape_abort_pipeline (drive);
- if (tape->onstream && !tape->raw && error == IDETAPE_ERROR_GENERAL && tape->sense.sense_key == 3) {
- clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
- printk(KERN_ERR "ide-tape: %s: write error, enabling error recovery\n", tape->name);
- tape->onstream_write_error = 1;
- remove_stage = 0;
- tape->nr_pending_stages++;
- tape->next_stage = tape->first_stage;
- rq->current_nr_sectors = rq->nr_sectors;
- if (tape->sem)
- up(tape->sem);
- }
- }
- } else if (rq->cmd == IDETAPE_READ_RQ) {
- if (error == IDETAPE_ERROR_EOD) {
- set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
- idetape_abort_pipeline(drive);
- }
- }
- if (tape->next_stage != NULL && !tape->onstream_write_error) {
- idetape_active_next_stage (drive);
-
- /*
- * Insert the next request into the request queue.
- */
- (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end);
- } else if (!error) {
- if (!tape->onstream)
- idetape_increase_max_pipeline_stages (drive);
- }
- }
- ide_end_drive_cmd (drive, 0, 0);
- if (remove_stage)
- idetape_remove_stage_head (drive);
- if (tape->active_data_request == NULL)
- clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
- spin_unlock_irqrestore(&tape->spinlock, flags);
-}
-
-static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
- if (!tape->pc->error) {
- idetape_analyze_error (drive,(idetape_request_sense_result_t *) tape->pc->buffer);
- idetape_end_request (1,HWGROUP (drive));
- } else {
- printk (KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
- idetape_end_request (0,HWGROUP (drive));
- }
- return ide_stopped;
-}
-
-static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
-{
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
- pc->c[4] = 20;
- pc->request_transfer = 18;
- pc->callback = &idetape_request_sense_callback;
-}
-
-/*
- * idetape_queue_pc_head generates a new packet command request in front
- * of the request queue, before the current request, so that it will be
- * processed immediately, on the next pass through the driver.
- *
- * idetape_queue_pc_head is called from the request handling part of
- * the driver (the "bottom" part). Safe storage for the request should
- * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
- * before calling idetape_queue_pc_head.
- *
- * Memory for those requests is pre-allocated at initialization time, and
- * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
- * space for the maximum possible number of inter-dependent packet commands.
- *
- * The higher level of the driver - The ioctl handler and the character
- * device handling functions should queue request to the lower level part
- * and wait for their completion using idetape_queue_pc_tail or
- * idetape_queue_rw_tail.
- */
-static void idetape_queue_pc_head (ide_drive_t *drive,idetape_pc_t *pc,struct request *rq)
-{
- ide_init_drive_cmd (rq);
- rq->buffer = (char *) pc;
- rq->cmd = IDETAPE_PC_RQ1;
- (void) ide_do_drive_cmd (drive, rq, ide_preempt);
-}
-
-/*
- * idetape_retry_pc is called when an error was detected during the
- * last packet command. We queue a request sense packet command in
- * the head of the request list.
- */
-static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t *pc;
- struct request *rq;
- idetape_error_reg_t error;
-
- error.all = IN_BYTE (IDE_ERROR_REG);
- pc = idetape_next_pc_storage (drive);
- rq = idetape_next_rq_storage (drive);
- idetape_create_request_sense_cmd (pc);
- set_bit (IDETAPE_IGNORE_DSC, &tape->flags);
- idetape_queue_pc_head (drive, pc, rq);
- return ide_stopped;
-}
-
-/*
- * idetape_postpone_request postpones the current request so that
- * ide.c will be able to service requests from another device on
- * the same hwgroup while we are polling for DSC.
- */
-static void idetape_postpone_request (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
-#endif
- tape->postponed_rq = HWGROUP(drive)->rq;
- ide_stall_queue(drive, tape->dsc_polling_frequency);
-}
-
-/*
- * idetape_pc_intr is the usual interrupt handler which will be called
- * during a packet command. We will transfer some of the data (as
- * requested by the drive) and will re-point interrupt handler to us.
- * When data transfer is finished, we will act according to the
- * algorithm described before idetape_issue_packet_command.
- *
- */
-static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_status_reg_t status;
- idetape_bcount_reg_t bcount;
- idetape_ireason_reg_t ireason;
- idetape_pc_t *pc=tape->pc;
-
- unsigned int temp;
- unsigned long cmd_time;
-#if SIMULATE_ERRORS
- static int error_sim_count = 0;
-#endif
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_pc_intr interrupt handler\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- status.all = GET_STAT(); /* Clear the interrupt */
-
-#ifdef CONFIG_BLK_DEV_IDEDMA
- if (test_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
- if (HWIF(drive)->dmaproc(ide_dma_end, drive)) {
- /*
- * A DMA error is sometimes expected. For example,
- * if the tape is crossing a filemark during a
- * READ command, it will issue an irq and position
- * itself before the filemark, so that only a partial
- * data transfer will occur (which causes the DMA
- * error). In that case, we will later ask the tape
- * how much bytes of the original request were
- * actually transferred (we can't receive that
- * information from the DMA engine on most chipsets).
- */
- set_bit (PC_DMA_ERROR, &pc->flags);
- } else if (!status.b.check) {
- pc->actually_transferred=pc->request_transfer;
- idetape_update_buffers (pc);
- }
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: DMA finished\n");
-#endif /* IDETAPE_DEBUG_LOG */
- }
-#endif /* CONFIG_BLK_DEV_IDEDMA */
-
- if (!status.b.drq) { /* No more interrupts */
- cmd_time = (jiffies - tape->cmd_start_time) * 1000 / HZ;
- tape->max_cmd_time = IDE_MAX(cmd_time, tape->max_cmd_time);
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
-#endif /* IDETAPE_DEBUG_LOG */
- clear_bit (PC_DMA_IN_PROGRESS, &pc->flags);
-
- ide__sti(); /* local CPU only */
-
-#if SIMULATE_ERRORS
- if ((pc->c[0] == IDETAPE_WRITE_CMD || pc->c[0] == IDETAPE_READ_CMD) && (++error_sim_count % 100) == 0) {
- printk(KERN_INFO "ide-tape: %s: simulating error\n", tape->name);
- status.b.check = 1;
- }
-#endif
- if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
- status.b.check = 0;
- if (status.b.check || test_bit (PC_DMA_ERROR, &pc->flags)) { /* Error detected */
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 1)
- printk (KERN_INFO "ide-tape: %s: I/O error, ",tape->name);
-#endif /* IDETAPE_DEBUG_LOG */
- if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
- printk (KERN_ERR "ide-tape: I/O error in request sense command\n");
- return ide_do_reset (drive);
- }
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 1)
- printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
-#endif
- return idetape_retry_pc (drive); /* Retry operation */
- }
- pc->error = 0;
- if (!tape->onstream && test_bit (PC_WAIT_FOR_DSC, &pc->flags) && !status.b.dsc) { /* Media access command */
- tape->dsc_polling_start = jiffies;
- tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
- tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
- idetape_postpone_request (drive); /* Allow ide.c to handle other requests */
- return ide_stopped;
- }
- if (tape->failed_pc == pc)
- tape->failed_pc=NULL;
- return pc->callback(drive); /* Command finished - Call the callback function */
- }
-#ifdef CONFIG_BLK_DEV_IDEDMA
- if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
- printk (KERN_ERR "ide-tape: The tape wants to issue more interrupts in DMA mode\n");
- printk (KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
- (void) HWIF(drive)->dmaproc(ide_dma_off, drive);
- return ide_do_reset (drive);
- }
-#endif /* CONFIG_BLK_DEV_IDEDMA */
- bcount.b.high=IN_BYTE (IDE_BCOUNTH_REG); /* Get the number of bytes to transfer */
- bcount.b.low=IN_BYTE (IDE_BCOUNTL_REG); /* on this interrupt */
- ireason.all=IN_BYTE (IDE_IREASON_REG);
-
- if (ireason.b.cod) {
- printk (KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
- return ide_do_reset (drive);
- }
- if (ireason.b.io == test_bit (PC_WRITING, &pc->flags)) { /* Hopefully, we will never get here */
- printk (KERN_ERR "ide-tape: We wanted to %s, ", ireason.b.io ? "Write":"Read");
- printk (KERN_ERR "ide-tape: but the tape wants us to %s !\n",ireason.b.io ? "Read":"Write");
- return ide_do_reset (drive);
- }
- if (!test_bit (PC_WRITING, &pc->flags)) { /* Reading - Check that we have enough space */
- temp = pc->actually_transferred + bcount.all;
- if ( temp > pc->request_transfer) {
- if (temp > pc->buffer_size) {
- printk (KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
- idetape_discard_data (drive,bcount.all);
- ide_set_handler (drive,&idetape_pc_intr,IDETAPE_WAIT_CMD,NULL);
- return ide_started;
- }
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
-#endif /* IDETAPE_DEBUG_LOG */
- }
- }
- if (test_bit (PC_WRITING, &pc->flags)) {
- if (pc->bh != NULL)
- idetape_output_buffers (drive, pc, bcount.all);
- else
- atapi_output_bytes (drive,pc->current_position,bcount.all); /* Write the current buffer */
- } else {
- if (pc->bh != NULL)
- idetape_input_buffers (drive, pc, bcount.all);
- else
- atapi_input_bytes (drive,pc->current_position,bcount.all); /* Read the current buffer */
- }
- pc->actually_transferred+=bcount.all; /* Update the current position */
- pc->current_position+=bcount.all;
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all);
-#endif
- ide_set_handler (drive,&idetape_pc_intr,IDETAPE_WAIT_CMD,NULL); /* And set the interrupt handler again */
- return ide_started;
-}
-
-/*
- * Packet Command Interface
- *
- * The current Packet Command is available in tape->pc, and will not
- * change until we finish handling it. Each packet command is associated
- * with a callback function that will be called when the command is
- * finished.
- *
- * The handling will be done in three stages:
- *
- * 1. idetape_issue_packet_command will send the packet command to the
- * drive, and will set the interrupt handler to idetape_pc_intr.
- *
- * 2. On each interrupt, idetape_pc_intr will be called. This step
- * will be repeated until the device signals us that no more
- * interrupts will be issued.
- *
- * 3. ATAPI Tape media access commands have immediate status with a
- * delayed process. In case of a successful initiation of a
- * media access packet command, the DSC bit will be set when the
- * actual execution of the command is finished.
- * Since the tape drive will not issue an interrupt, we have to
- * poll for this event. In this case, we define the request as
- * "low priority request" by setting rq_status to
- * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
- * the driver.
- *
- * ide.c will then give higher priority to requests which
- * originate from the other device, until will change rq_status
- * to RQ_ACTIVE.
- *
- * 4. When the packet command is finished, it will be checked for errors.
- *
- * 5. In case an error was found, we queue a request sense packet command
- * in front of the request queue and retry the operation up to
- * IDETAPE_MAX_PC_RETRIES times.
- *
- * 6. In case no error was found, or we decided to give up and not
- * to retry again, the callback function will be called and then
- * we will handle the next request.
- *
- */
-static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t *pc = tape->pc;
- idetape_ireason_reg_t ireason;
- int retries = 100;
- ide_startstop_t startstop;
-
- if (ide_wait_stat (&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
- printk (KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
- return startstop;
- }
- ireason.all=IN_BYTE (IDE_IREASON_REG);
- while (retries-- && (!ireason.b.cod || ireason.b.io)) {
- printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, retrying\n");
- udelay(100);
- ireason.all = IN_BYTE(IDE_IREASON_REG);
- if (retries == 0) {
- printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, ignoring\n");
- ireason.b.cod = 1;
- ireason.b.io = 0;
- }
- }
- if (!ireason.b.cod || ireason.b.io) {
- printk (KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing a packet command\n");
- return ide_do_reset (drive);
- }
- tape->cmd_start_time = jiffies;
- ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); /* Set the interrupt routine */
- atapi_output_bytes (drive,pc->c,12); /* Send the actual packet */
- return ide_started;
-}
-
-static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_bcount_reg_t bcount;
- int dma_ok=0;
-
-#if IDETAPE_DEBUG_BUGS
- if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
- printk (KERN_ERR "ide-tape: possible ide-tape.c bug - Two request sense in serial were issued\n");
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
- tape->failed_pc=pc;
- tape->pc=pc; /* Set the current packet command */
-
- if (pc->retries > IDETAPE_MAX_PC_RETRIES || test_bit (PC_ABORT, &pc->flags)) {
- /*
- * We will "abort" retrying a packet command in case
- * a legitimate error code was received (crossing a
- * filemark, or DMA error in the end of media, for
- * example).
- */
- if (!test_bit (PC_ABORT, &pc->flags)) {
- if (!(pc->c[0] == 0 && tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) {
- printk (KERN_ERR "ide-tape: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n",
- tape->name, pc->c[0], tape->sense_key, tape->asc, tape->ascq);
- if (tape->onstream && pc->c[0] == 8 && tape->sense_key == 3 && tape->asc == 0x11) /* AJN-1: 11 should be 0x11 */
- printk(KERN_ERR "ide-tape: %s: enabling read error recovery\n", tape->name);
- }
- pc->error = IDETAPE_ERROR_GENERAL; /* Giving up */
- }
- tape->failed_pc=NULL;
- return pc->callback(drive);
- }
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: Retry number - %d\n",pc->retries);
-#endif /* IDETAPE_DEBUG_LOG */
-
- pc->retries++;
- pc->actually_transferred=0; /* We haven't transferred any data yet */
- pc->current_position=pc->buffer;
- bcount.all=pc->request_transfer; /* Request to transfer the entire buffer at once */
-
-#ifdef CONFIG_BLK_DEV_IDEDMA
- if (test_and_clear_bit (PC_DMA_ERROR, &pc->flags)) {
- printk (KERN_WARNING "ide-tape: DMA disabled, reverting to PIO\n");
- (void) HWIF(drive)->dmaproc(ide_dma_off, drive);
- }
- if (test_bit (PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
- dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive);
-#endif /* CONFIG_BLK_DEV_IDEDMA */
-
- if (IDE_CONTROL_REG)
- OUT_BYTE (drive->ctl,IDE_CONTROL_REG);
- OUT_BYTE (dma_ok ? 1:0,IDE_FEATURE_REG); /* Use PIO/DMA */
- OUT_BYTE (bcount.b.high,IDE_BCOUNTH_REG);
- OUT_BYTE (bcount.b.low,IDE_BCOUNTL_REG);
- OUT_BYTE (drive->select.all,IDE_SELECT_REG);
-#ifdef CONFIG_BLK_DEV_IDEDMA
- if (dma_ok) { /* Begin DMA, if necessary */
- set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
- (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive));
- }
-#endif /* CONFIG_BLK_DEV_IDEDMA */
- if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
- ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL);
- OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG);
- return ide_started;
- } else {
- OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG);
- return idetape_transfer_pc(drive);
- }
-}
-
-/*
- * General packet command callback function.
- */
-static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- idetape_end_request (tape->pc->error ? 0:1, HWGROUP(drive));
- return ide_stopped;
-}
-
-/*
- * A mode sense command is used to "sense" tape parameters.
- */
-static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, byte page_code)
-{
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_MODE_SENSE_CMD;
- pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors for now */
- pc->c[2] = page_code;
- pc->c[3] = 255; /* Don't limit the returned information */
- pc->c[4] = 255; /* (We will just discard data in that case) */
- if (page_code == IDETAPE_CAPABILITIES_PAGE)
- pc->request_transfer = 24;
- else
- pc->request_transfer = 50;
- pc->callback = &idetape_pc_callback;
-}
-
-static ide_startstop_t idetape_onstream_buffer_fill_callback (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- tape->max_frames = tape->pc->buffer[4 + 2];
- tape->cur_frames = tape->pc->buffer[4 + 3];
- if (tape->chrdev_direction == idetape_direction_write)
- tape->tape_head = tape->buffer_head - tape->cur_frames;
- else
- tape->tape_head = tape->buffer_head + tape->cur_frames;
- if (tape->tape_head != tape->last_tape_head) {
- tape->last_tape_head = tape->tape_head;
- tape->tape_still_time_begin = jiffies;
- if (tape->tape_still_time > 200)
- tape->measure_insert_time = 1;
- }
- tape->tape_still_time = (jiffies - tape->tape_still_time_begin) * 1000 / HZ;
-#if USE_IOTRACE
- IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
-#endif
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 1)
- printk(KERN_INFO "ide-tape: buffer fill callback, %d/%d\n", tape->cur_frames, tape->max_frames);
-#endif
- idetape_end_request (tape->pc->error ? 0:1, HWGROUP(drive));
- return ide_stopped;
-}
-
-static void idetape_queue_onstream_buffer_fill (ide_drive_t *drive)
-{
- idetape_pc_t *pc;
- struct request *rq;
-
- pc = idetape_next_pc_storage (drive);
- rq = idetape_next_rq_storage (drive);
- idetape_create_mode_sense_cmd (pc, 0x33);
- pc->callback = idetape_onstream_buffer_fill_callback;
- idetape_queue_pc_head (drive, pc, rq);
-}
-
-static void calculate_speeds(ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int full = 125, empty = 75;
-
- if (jiffies > tape->controlled_pipeline_head_time + 120 * HZ) {
- tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
- tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
- tape->controlled_last_pipeline_head = tape->pipeline_head;
- tape->controlled_pipeline_head_time = jiffies;
- }
- if (jiffies > tape->controlled_pipeline_head_time + 60 * HZ)
- tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
- else if (jiffies > tape->controlled_previous_head_time)
- tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
-
- if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { /* -1 for read mode error recovery */
- if (jiffies > tape->uncontrolled_previous_head_time + 10 * HZ) {
- tape->uncontrolled_pipeline_head_time = jiffies;
- tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
- }
- } else {
- tape->uncontrolled_previous_head_time = jiffies;
- tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
- if (jiffies > tape->uncontrolled_pipeline_head_time + 30 * HZ) {
- tape->uncontrolled_pipeline_head_time = jiffies;
- }
- }
- tape->pipeline_head_speed = IDE_MAX(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
- if (tape->speed_control == 0) {
- tape->max_insert_speed = 5000;
- } else if (tape->speed_control == 1) {
- if (tape->nr_pending_stages >= tape->max_stages / 2)
- tape->max_insert_speed = tape->pipeline_head_speed +
- (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
- else
- tape->max_insert_speed = 500 +
- (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
- if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
- tape->max_insert_speed = 5000;
- } else if (tape->speed_control == 2) {
- tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
- (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
- } else
- tape->max_insert_speed = tape->speed_control;
- tape->max_insert_speed = IDE_MAX(tape->max_insert_speed, 500);
-}
-
-static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t *pc = tape->pc;
- idetape_status_reg_t status;
-
- if (tape->onstream)
- printk(KERN_INFO "ide-tape: bug: onstream, media_access_finished\n");
- status.all = GET_STAT();
- if (status.b.dsc) {
- if (status.b.check) { /* Error detected */
- printk (KERN_ERR "ide-tape: %s: I/O error, ",tape->name);
- return idetape_retry_pc (drive); /* Retry operation */
- }
- pc->error = 0;
- if (tape->failed_pc == pc)
- tape->failed_pc = NULL;
- } else {
- pc->error = IDETAPE_ERROR_GENERAL;
- tape->failed_pc = NULL;
- }
- return pc->callback (drive);
-}
-
-static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- struct request *rq = HWGROUP(drive)->rq;
- int blocks = tape->pc->actually_transferred / tape->tape_block_size;
-
- tape->avg_size += blocks * tape->tape_block_size;
- tape->insert_size += blocks * tape->tape_block_size;
- if (tape->insert_size > 1024 * 1024)
- tape->measure_insert_time = 1;
- if (tape->measure_insert_time) {
- tape->measure_insert_time = 0;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- }
- if (jiffies > tape->insert_time)
- tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
- if (jiffies - tape->avg_time >= HZ) {
- tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
- tape->avg_size = 0;
- tape->avg_time = jiffies;
- }
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- tape->first_frame_position += blocks;
- rq->current_nr_sectors -= blocks;
-
- if (!tape->pc->error)
- idetape_end_request (1, HWGROUP (drive));
- else
- idetape_end_request (tape->pc->error, HWGROUP (drive));
- return ide_stopped;
-}
-
-static void idetape_create_read_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh)
-{
- struct buffer_head *p = bh;
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_READ_CMD;
- put_unaligned (htonl (length), (unsigned int *) &pc->c[1]);
- pc->c[1] = 1;
- pc->callback = &idetape_rw_callback;
- pc->bh = bh;
- atomic_set(&bh->b_count, 0);
- pc->buffer = NULL;
- if (tape->onstream) {
- while (p) {
- atomic_set(&p->b_count, 0);
- p = p->b_reqnext;
- }
- }
- if (!tape->onstream) {
- pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
- if (pc->request_transfer == tape->stage_size)
- set_bit (PC_DMA_RECOMMENDED, &pc->flags);
- } else {
- if (length) {
- pc->request_transfer = pc->buffer_size = 32768 + 512;
- set_bit (PC_DMA_RECOMMENDED, &pc->flags);
- } else
- pc->request_transfer = 0;
- }
-}
-
-static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh)
-{
- int size = 32768;
-
- struct buffer_head *p = bh;
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_READ_BUFFER_CMD;
- pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
- pc->c[7] = size >> 8;
- pc->c[8] = size & 0xff;
- pc->callback = &idetape_pc_callback;
- pc->bh = bh;
- atomic_set(&bh->b_count, 0);
- pc->buffer = NULL;
- while (p) {
- atomic_set(&p->b_count, 0);
- p = p->b_reqnext;
- }
- pc->request_transfer = pc->buffer_size = size;
-}
-
-static void idetape_create_write_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh)
-{
- struct buffer_head *p = bh;
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_WRITE_CMD;
- put_unaligned (htonl (length), (unsigned int *) &pc->c[1]);
- pc->c[1] = 1;
- pc->callback = &idetape_rw_callback;
- set_bit (PC_WRITING, &pc->flags);
- if (tape->onstream) {
- while (p) {
- atomic_set(&p->b_count, p->b_size);
- p = p->b_reqnext;
- }
- }
- pc->bh = bh;
- pc->b_data = bh->b_data;
- pc->b_count = atomic_read(&bh->b_count);
- pc->buffer = NULL;
- if (!tape->onstream) {
- pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
- if (pc->request_transfer == tape->stage_size)
- set_bit (PC_DMA_RECOMMENDED, &pc->flags);
- } else {
- if (length) {
- pc->request_transfer = pc->buffer_size = 32768 + 512;
- set_bit (PC_DMA_RECOMMENDED, &pc->flags);
- } else
- pc->request_transfer = 0;
- }
-}
-
-/*
- * idetape_do_request is our request handling function.
- */
-static ide_startstop_t idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t *pc;
- struct request *postponed_rq = tape->postponed_rq;
- idetape_status_reg_t status;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 5)
- printk (KERN_INFO "ide-tape: rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors);
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (!IDETAPE_RQ_CMD (rq->cmd)) {
- /*
- * We do not support buffer cache originated requests.
- */
- printk (KERN_NOTICE "ide-tape: %s: Unsupported command in request queue (%d)\n", drive->name, rq->cmd);
- ide_end_request (0,HWGROUP (drive)); /* Let the common code handle it */
- return ide_stopped;
- }
-
- /*
- * Retry a failed packet command
- */
- if (tape->failed_pc != NULL && tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
- return idetape_issue_packet_command (drive, tape->failed_pc);
- }
-#if IDETAPE_DEBUG_BUGS
- if (postponed_rq != NULL)
- if (rq != postponed_rq) {
- printk (KERN_ERR "ide-tape: ide-tape.c bug - Two DSC requests were queued\n");
- idetape_end_request (0,HWGROUP (drive));
- return ide_stopped;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- tape->postponed_rq = NULL;
-
- /*
- * If the tape is still busy, postpone our request and service
- * the other device meanwhile.
- */
- status.all = GET_STAT();
-
- /*
- * The OnStream tape drive doesn't support DSC. Assume
- * that DSC is always set.
- */
- if (tape->onstream)
- status.b.dsc = 1;
- if (!drive->dsc_overlap && rq->cmd != IDETAPE_PC_RQ2)
- set_bit (IDETAPE_IGNORE_DSC, &tape->flags);
-
- /*
- * For the OnStream tape, check the current status of the tape
- * internal buffer using data gathered from the buffer fill
- * mode page, and postpone our request, effectively "disconnecting"
- * from the IDE bus, in case the buffer is full (writing) or
- * empty (reading), and there is a danger that our request will
- * hold the IDE bus during actual media access.
- */
- if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
- tape->measure_insert_time = 1;
- if (tape->req_buffer_fill && (rq->cmd == IDETAPE_WRITE_RQ || rq->cmd == IDETAPE_READ_RQ)) {
- tape->req_buffer_fill = 0;
- tape->writes_since_buffer_fill = 0;
- tape->reads_since_buffer_fill = 0;
- tape->last_buffer_fill = jiffies;
- idetape_queue_onstream_buffer_fill(drive);
- if (jiffies > tape->insert_time)
- tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
- return ide_stopped;
- }
- if (jiffies > tape->insert_time)
- tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
- calculate_speeds(drive);
- if (tape->onstream && tape->max_frames &&
- ((rq->cmd == IDETAPE_WRITE_RQ && (tape->cur_frames == tape->max_frames || (tape->speed_control && tape->cur_frames > 5 && (tape->insert_speed > tape->max_insert_speed || (0 /* tape->cur_frames > 30 && tape->tape_still_time > 200 */))))) ||
- (rq->cmd == IDETAPE_READ_RQ && (tape->cur_frames == 0 || (tape->speed_control && (tape->cur_frames < tape->max_frames - 5) && tape->insert_speed > tape->max_insert_speed)) && rq->nr_sectors))) {
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk(KERN_INFO "ide-tape: postponing request, cmd %d, cur %d, max %d\n",
- rq->cmd, tape->cur_frames, tape->max_frames);
-#endif
- if (tape->postpone_cnt++ < 500) {
- status.b.dsc = 0;
- tape->req_buffer_fill = 1;
- }
-#if ONSTREAM_DEBUG
- else if (tape->debug_level >= 4)
- printk(KERN_INFO "ide-tape: %s: postpone_cnt %d\n", tape->name, tape->postpone_cnt);
-#endif
- }
- if (!test_and_clear_bit (IDETAPE_IGNORE_DSC, &tape->flags) && !status.b.dsc) {
- if (postponed_rq == NULL) {
- tape->dsc_polling_start = jiffies;
- tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
- tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
- } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) {
- printk (KERN_ERR "ide-tape: %s: DSC timeout\n", tape->name);
- if (rq->cmd == IDETAPE_PC_RQ2) {
- idetape_media_access_finished (drive);
- return ide_stopped;
- } else {
- return ide_do_reset (drive);
- }
- } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD)
- tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
- idetape_postpone_request (drive);
- return ide_stopped;
- }
- switch (rq->cmd) {
- case IDETAPE_READ_RQ:
- tape->buffer_head++;
-#if USE_IOTRACE
- IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
-#endif
- tape->postpone_cnt = 0;
- tape->reads_since_buffer_fill++;
- if (tape->onstream) {
- if (tape->cur_frames - tape->reads_since_buffer_fill <= 0)
- tape->req_buffer_fill = 1;
- if (jiffies > tape->last_buffer_fill + 5 * HZ / 100)
- tape->req_buffer_fill = 1;
- }
- pc=idetape_next_pc_storage (drive);
- idetape_create_read_cmd (tape, pc, rq->current_nr_sectors, rq->bh);
- break;
- case IDETAPE_WRITE_RQ:
- tape->buffer_head++;
-#if USE_IOTRACE
- IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
-#endif
- tape->postpone_cnt = 0;
- tape->writes_since_buffer_fill++;
- if (tape->onstream) {
- if (tape->cur_frames + tape->writes_since_buffer_fill >= tape->max_frames)
- tape->req_buffer_fill = 1;
- if (jiffies > tape->last_buffer_fill + 5 * HZ / 100)
- tape->req_buffer_fill = 1;
- calculate_speeds(drive);
- }
- pc=idetape_next_pc_storage (drive);
- idetape_create_write_cmd (tape, pc, rq->current_nr_sectors, rq->bh);
- break;
- case IDETAPE_READ_BUFFER_RQ:
- tape->postpone_cnt = 0;
- pc=idetape_next_pc_storage (drive);
- idetape_create_read_buffer_cmd (tape, pc, rq->current_nr_sectors, rq->bh);
- break;
- case IDETAPE_ABORTED_WRITE_RQ:
- rq->cmd = IDETAPE_WRITE_RQ;
- idetape_end_request (IDETAPE_ERROR_EOD, HWGROUP(drive));
- return ide_stopped;
- case IDETAPE_ABORTED_READ_RQ:
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: detected aborted read rq\n", tape->name);
-#endif
- rq->cmd = IDETAPE_READ_RQ;
- idetape_end_request (IDETAPE_ERROR_EOD, HWGROUP(drive));
- return ide_stopped;
- case IDETAPE_PC_RQ1:
- pc=(idetape_pc_t *) rq->buffer;
- rq->cmd = IDETAPE_PC_RQ2;
- break;
- case IDETAPE_PC_RQ2:
- idetape_media_access_finished (drive);
- return ide_stopped;
- default:
- printk (KERN_ERR "ide-tape: bug in IDETAPE_RQ_CMD macro\n");
- idetape_end_request (0,HWGROUP (drive));
- return ide_stopped;
- }
- return idetape_issue_packet_command (drive, pc);
-}
-
-/*
- * Pipeline related functions
- */
-static inline int idetape_pipeline_active (idetape_tape_t *tape)
-{
- int rc1, rc2;
-
- rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
- rc2 = (tape->active_data_request != NULL);
- return rc1;
-}
-
-/*
- * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
- * stage, along with all the necessary small buffers which together make
- * a buffer of size tape->stage_size (or a bit more). We attempt to
- * combine sequential pages as much as possible.
- *
- * Returns a pointer to the new allocated stage, or NULL if we
- * can't (or don't want to) allocate a stage.
- *
- * Pipeline stages are optional and are used to increase performance.
- * If we can't allocate them, we'll manage without them.
- */
-static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
-{
- idetape_stage_t *stage;
- struct buffer_head *prev_bh, *bh;
- int pages = tape->pages_per_stage;
- char *b_data;
-
- if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
- return NULL;
- stage->next = NULL;
-
- bh = stage->bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL);
- if (bh == NULL)
- goto abort;
- bh->b_reqnext = NULL;
- if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
- goto abort;
- if (clear)
- memset(bh->b_data, 0, PAGE_SIZE);
- bh->b_size = PAGE_SIZE;
- atomic_set(&bh->b_count, full ? bh->b_size : 0);
- set_bit (BH_Lock, &bh->b_state);
-
- while (--pages) {
- if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
- goto abort;
- if (clear)
- memset(b_data, 0, PAGE_SIZE);
- if (bh->b_data == b_data + PAGE_SIZE) {
- bh->b_size += PAGE_SIZE;
- bh->b_data -= PAGE_SIZE;
- if (full)
- atomic_add(PAGE_SIZE, &bh->b_count);
- continue;
- }
- if (b_data == bh->b_data + bh->b_size) {
- bh->b_size += PAGE_SIZE;
- if (full)
- atomic_add(PAGE_SIZE, &bh->b_count);
- continue;
- }
- prev_bh = bh;
- if ((bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL)) == NULL) {
- free_page ((unsigned long) b_data);
- goto abort;
- }
- bh->b_reqnext = NULL;
- bh->b_data = b_data;
- bh->b_size = PAGE_SIZE;
- atomic_set(&bh->b_count, full ? bh->b_size : 0);
- set_bit (BH_Lock, &bh->b_state);
- prev_bh->b_reqnext = bh;
- }
- bh->b_size -= tape->excess_bh_size;
- if (full)
- atomic_sub(tape->excess_bh_size, &bh->b_count);
- if (tape->onstream)
- stage->aux = (os_aux_t *) (bh->b_data + bh->b_size - OS_AUX_SIZE);
- return stage;
-abort:
- __idetape_kfree_stage (stage);
- return NULL;
-}
-
-static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
-{
- idetape_stage_t *cache_stage = tape->cache_stage;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->nr_stages >= tape->max_stages)
- return NULL;
- if (cache_stage != NULL) {
- tape->cache_stage = NULL;
- return cache_stage;
- }
- return __idetape_kmalloc_stage (tape, 0, 0);
-}
-
-static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char *buf, int n)
-{
- struct buffer_head *bh = tape->bh;
- int count;
-
- while (n) {
-#if IDETAPE_DEBUG_BUGS
- if (bh == NULL) {
- printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_from_user\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- count = IDE_MIN (bh->b_size - atomic_read(&bh->b_count), n);
- copy_from_user (bh->b_data + atomic_read(&bh->b_count), buf, count);
- n -= count; atomic_add(count, &bh->b_count); buf += count;
- if (atomic_read(&bh->b_count) == bh->b_size) {
- bh = bh->b_reqnext;
- if (bh)
- atomic_set(&bh->b_count, 0);
- }
- }
- tape->bh = bh;
-}
-
-static void idetape_copy_stage_to_user (idetape_tape_t *tape, char *buf, idetape_stage_t *stage, int n)
-{
- struct buffer_head *bh = tape->bh;
- int count;
-
- while (n) {
-#if IDETAPE_DEBUG_BUGS
- if (bh == NULL) {
- printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_to_user\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- count = IDE_MIN (tape->b_count, n);
- copy_to_user (buf, tape->b_data, count);
- n -= count; tape->b_data += count; tape->b_count -= count; buf += count;
- if (!tape->b_count) {
- tape->bh = bh = bh->b_reqnext;
- if (bh) {
- tape->b_data = bh->b_data;
- tape->b_count = atomic_read(&bh->b_count);
- }
- }
- }
-}
-
-static void idetape_init_merge_stage (idetape_tape_t *tape)
-{
- struct buffer_head *bh = tape->merge_stage->bh;
-
- tape->bh = bh;
- if (tape->chrdev_direction == idetape_direction_write)
- atomic_set(&bh->b_count, 0);
- else {
- tape->b_data = bh->b_data;
- tape->b_count = atomic_read(&bh->b_count);
- }
-}
-
-static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
-{
- struct buffer_head *tmp;
- os_aux_t *tmp_aux;
-
- tmp = stage->bh; tmp_aux = stage->aux;
- stage->bh = tape->merge_stage->bh; stage->aux = tape->merge_stage->aux;
- tape->merge_stage->bh = tmp; tape->merge_stage->aux = tmp_aux;
- idetape_init_merge_stage (tape);
-}
-
-/*
- * idetape_add_stage_tail adds a new stage at the end of the pipeline.
- */
-static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
-#endif /* IDETAPE_DEBUG_LOG */
- spin_lock_irqsave(&tape->spinlock, flags);
- stage->next=NULL;
- if (tape->last_stage != NULL)
- tape->last_stage->next=stage;
- else
- tape->first_stage=tape->next_stage=stage;
- tape->last_stage=stage;
- if (tape->next_stage == NULL)
- tape->next_stage=tape->last_stage;
- tape->nr_stages++;
- tape->nr_pending_stages++;
- spin_unlock_irqrestore(&tape->spinlock, flags);
-}
-
-/*
- * Initialize the OnStream AUX
- */
-static void idetape_init_stage (ide_drive_t *drive, idetape_stage_t *stage, int frame_type, int logical_blk_num)
-{
- idetape_tape_t *tape = drive->driver_data;
- os_aux_t *aux = stage->aux;
- os_partition_t *par = &aux->partition;
- os_dat_t *dat = &aux->dat;
-
- if (!tape->onstream || tape->raw)
- return;
- memset(aux, 0, sizeof(*aux));
- aux->format_id = htonl(0);
- memcpy(aux->application_sig, "LIN3", 4);
- aux->hdwr = htonl(0);
- aux->frame_type = frame_type;
-
- if (frame_type == OS_FRAME_TYPE_HEADER) {
- aux->update_frame_cntr = htonl(tape->update_frame_cntr);
- par->partition_num = OS_CONFIG_PARTITION;
- par->par_desc_ver = OS_PARTITION_VERSION;
- par->wrt_pass_cntr = htons(0xffff);
- par->first_frame_addr = htonl(0);
- par->last_frame_addr = htonl(0xbb7);
- } else {
- aux->update_frame_cntr = htonl(0);
- par->partition_num = OS_DATA_PARTITION;
- par->par_desc_ver = OS_PARTITION_VERSION;
- par->wrt_pass_cntr = htons(tape->wrt_pass_cntr);
- par->first_frame_addr = htonl(0x14);
- par->last_frame_addr = htonl(19239 * 24);
- }
- if (frame_type != OS_FRAME_TYPE_HEADER) {
- aux->frame_seq_num = htonl(logical_blk_num);
- aux->logical_blk_num_high = htonl(0);
- aux->logical_blk_num = htonl(logical_blk_num);
- } else {
- aux->frame_seq_num = htonl(0);
- aux->logical_blk_num_high = htonl(0);
- aux->logical_blk_num = htonl(0);
- }
-
- if (frame_type != OS_FRAME_TYPE_HEADER) {
- dat->dat_sz = 8;
- dat->reserved1 = 0;
- dat->entry_cnt = 1;
- dat->reserved3 = 0;
- if (frame_type == OS_FRAME_TYPE_DATA)
- dat->dat_list[0].blk_sz = htonl(32 * 1024);
- else
- dat->dat_list[0].blk_sz = 0;
- dat->dat_list[0].blk_cnt = htons(1);
- if (frame_type == OS_FRAME_TYPE_MARKER)
- dat->dat_list[0].flags = OS_DAT_FLAGS_MARK;
- else
- dat->dat_list[0].flags = OS_DAT_FLAGS_DATA;
- dat->dat_list[0].reserved = 0;
- } else
- aux->next_mark_addr = htonl(tape->first_mark_addr);
- aux->filemark_cnt = ntohl(tape->filemark_cnt);
- aux->phys_fm = ntohl(0xffffffff);
- aux->last_mark_addr = ntohl(tape->last_mark_addr);
-}
-
-/*
- * idetape_wait_for_request installs a semaphore in a pending request
- * and sleeps until it is serviced.
- *
- * The caller should ensure that the request will not be serviced
- * before we install the semaphore (usually by disabling interrupts).
- */
-static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
-{
- DECLARE_MUTEX_LOCKED(sem);
- idetape_tape_t *tape = drive->driver_data;
-
-#if IDETAPE_DEBUG_BUGS
- if (rq == NULL || !IDETAPE_RQ_CMD (rq->cmd)) {
- printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
- return;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- rq->sem = &sem;
- tape->sem = &sem;
- spin_unlock(&tape->spinlock);
- down(&sem);
- rq->sem = NULL;
- tape->sem = NULL;
- spin_lock_irq(&tape->spinlock);
-}
-
-static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_read_position_result_t *result;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (!tape->pc->error) {
- result = (idetape_read_position_result_t *) tape->pc->buffer;
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
-#endif /* IDETAPE_DEBUG_LOG */
- if (result->bpu) {
- printk (KERN_INFO "ide-tape: Block location is unknown to the tape\n");
- clear_bit (IDETAPE_ADDRESS_VALID, &tape->flags);
- idetape_end_request (0,HWGROUP (drive));
- } else {
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: Block Location - %u\n", ntohl (result->first_block));
-#endif /* IDETAPE_DEBUG_LOG */
- tape->partition = result->partition;
- tape->first_frame_position = ntohl (result->first_block);
- tape->last_frame_position = ntohl (result->last_block);
- tape->blocks_in_buffer = result->blocks_in_buffer[2];
- set_bit (IDETAPE_ADDRESS_VALID, &tape->flags);
- idetape_end_request (1,HWGROUP (drive));
- }
- } else {
- idetape_end_request (0,HWGROUP (drive));
- }
- return ide_stopped;
-}
-
-/*
- * idetape_create_write_filemark_cmd will:
- *
- * 1. Write a filemark if write_filemark=1.
- * 2. Flush the device buffers without writing a filemark
- * if write_filemark=0.
- *
- */
-static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
- if (tape->onstream)
- pc->c[1] = 1;
- pc->c[4] = write_filemark;
- set_bit (PC_WAIT_FOR_DSC, &pc->flags);
- pc->callback = &idetape_pc_callback;
-}
-
-static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
-{
- idetape_init_pc(pc);
- pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
- pc->callback = &idetape_pc_callback;
-}
-
-/*
- * idetape_queue_pc_tail is based on the following functions:
- *
- * ide_do_drive_cmd from ide.c
- * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
- *
- * We add a special packet command request to the tail of the request queue,
- * and wait for it to be serviced.
- *
- * This is not to be called from within the request handling part
- * of the driver ! We allocate here data in the stack, and it is valid
- * until the request is finished. This is not the case for the bottom
- * part of the driver, where we are always leaving the functions to wait
- * for an interrupt or a timer event.
- *
- * From the bottom part of the driver, we should allocate safe memory
- * using idetape_next_pc_storage and idetape_next_rq_storage, and add
- * the request to the request list without waiting for it to be serviced !
- * In that case, we usually use idetape_queue_pc_head.
- */
-static int __idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
-{
- struct request rq;
-
- ide_init_drive_cmd (&rq);
- rq.buffer = (char *) pc;
- rq.cmd = IDETAPE_PC_RQ1;
- return ide_do_drive_cmd (drive, &rq, ide_wait);
-}
-
-static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
- pc->c[4] = cmd;
- if (tape->onstream)
- pc->c[1] = 1;
- set_bit (PC_WAIT_FOR_DSC, &pc->flags);
- pc->callback = &idetape_pc_callback;
-}
-
-static int idetape_wait_ready (ide_drive_t *drive, unsigned long long timeout)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
-
- /*
- * Wait for the tape to become ready
- */
- timeout += jiffies;
- while (jiffies < timeout) {
- idetape_create_test_unit_ready_cmd(&pc);
- if (!__idetape_queue_pc_tail(drive, &pc))
- return 0;
- if (tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) {
- idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK);
- __idetape_queue_pc_tail(drive,&pc);
- idetape_create_test_unit_ready_cmd(&pc);
- if (!__idetape_queue_pc_tail(drive, &pc))
- return 0;
- }
- if (!(tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8)))
- break;
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(HZ / 10);
- }
- return -EIO;
-}
-
-static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
-{
- idetape_tape_t *tape = drive->driver_data;
- int rc;
-
- rc = __idetape_queue_pc_tail(drive, pc);
- if (rc) return rc;
- if (tape->onstream && test_bit(PC_WAIT_FOR_DSC, &pc->flags))
- rc = idetape_wait_ready(drive, 60 * 10 * HZ); /* AJN-4: Changed from 5 to 10 minutes;
- because retension takes approx. 8:20 with Onstream 30GB tape */
- return rc;
-}
-
-static int idetape_flush_tape_buffers (ide_drive_t *drive)
-{
- idetape_pc_t pc;
- int rc;
-
- idetape_create_write_filemark_cmd(drive, &pc, 0);
- if ((rc = idetape_queue_pc_tail (drive,&pc)))
- return rc;
- idetape_wait_ready(drive, 60 * 5 * HZ);
- return 0;
-}
-
-static void idetape_create_read_position_cmd (idetape_pc_t *pc)
-{
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_READ_POSITION_CMD;
- pc->request_transfer = 20;
- pc->callback = &idetape_read_position_callback;
-}
-
-static int idetape_read_position (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
- int position;
-
-#ifdef NO_LONGER_REQUIRED
- idetape_flush_tape_buffers(drive);
-#endif
- idetape_create_read_position_cmd(&pc);
- if (idetape_queue_pc_tail (drive,&pc))
- return -1;
- position = tape->first_frame_position;
-#ifdef NO_LONGER_REQUIRED
- if (tape->onstream) {
- if ((position != tape->last_frame_position - tape->blocks_in_buffer) &&
- (position != tape->last_frame_position + tape->blocks_in_buffer)) {
- if (tape->blocks_in_buffer == 0) {
- printk("ide-tape: %s: correcting read position %d, %d, %d\n", tape->name, position, tape->last_frame_position, tape->blocks_in_buffer);
- position = tape->last_frame_position;
- tape->first_frame_position = position;
- }
- }
- }
-#endif
- return position;
-}
-
-static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, byte partition, int skip)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_LOCATE_CMD;
- if (tape->onstream)
- pc->c[1] = 1;
- else
- pc->c[1] = 2;
- put_unaligned (htonl (block), (unsigned int *) &pc->c[3]);
- pc->c[8] = partition;
- if (tape->onstream)
- pc->c[9] = skip << 7;
- set_bit (PC_WAIT_FOR_DSC, &pc->flags);
- pc->callback = &idetape_pc_callback;
-}
-
-static void idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
-{
- idetape_init_pc(pc);
- pc->c[0] = IDETAPE_PREVENT_CMD;
- pc->c[4] = prevent;
- pc->callback = &idetape_pc_callback;
-}
-
-static int __idetape_discard_read_pipeline (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- int cnt;
-
- if (tape->chrdev_direction != idetape_direction_read)
- return 0;
- tape->merge_stage_size = 0;
- if (tape->merge_stage != NULL) {
- __idetape_kfree_stage (tape->merge_stage);
- tape->merge_stage = NULL;
- }
- tape->chrdev_direction = idetape_direction_none;
-
- if (tape->first_stage == NULL)
- return 0;
-
- spin_lock_irqsave(&tape->spinlock, flags);
- tape->next_stage = NULL;
- if (idetape_pipeline_active (tape))
- idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
-
- cnt = tape->nr_stages - tape->nr_pending_stages;
- while (tape->first_stage != NULL)
- idetape_remove_stage_head (drive);
- tape->nr_pending_stages = 0;
- tape->max_stages = tape->min_pipeline;
- return cnt;
-}
-
-/*
- * idetape_position_tape positions the tape to the requested block
- * using the LOCATE packet command. A READ POSITION command is then
- * issued to check where we are positioned.
- *
- * Like all higher level operations, we queue the commands at the tail
- * of the request queue and wait for their completion.
- *
- */
-static int idetape_position_tape (ide_drive_t *drive, unsigned int block, byte partition, int skip)
-{
- idetape_tape_t *tape = drive->driver_data;
- int retval;
- idetape_pc_t pc;
-
- if (tape->chrdev_direction == idetape_direction_read)
- __idetape_discard_read_pipeline(drive);
- idetape_wait_ready(drive, 60 * 5 * HZ);
- idetape_create_locate_cmd (drive, &pc, block, partition, skip);
- retval=idetape_queue_pc_tail (drive,&pc);
- if (retval) return (retval);
-
- idetape_create_read_position_cmd (&pc);
- return (idetape_queue_pc_tail (drive,&pc));
-}
-
-static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
-{
- idetape_tape_t *tape = drive->driver_data;
- int cnt;
- int seek, position;
-
- cnt = __idetape_discard_read_pipeline(drive);
- if (restore_position) {
- position = idetape_read_position(drive);
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: address %u, nr_stages %d\n", position, cnt);
-#endif
- seek = position > cnt ? position - cnt : 0;
- if (idetape_position_tape(drive, seek, 0, 0)) {
- printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
- return;
- }
- }
-}
-
-static void idetape_update_stats (ide_drive_t *drive)
-{
- idetape_pc_t pc;
-
- idetape_create_mode_sense_cmd (&pc, 0x33);
- pc.callback = idetape_onstream_buffer_fill_callback;
- (void) idetape_queue_pc_tail(drive, &pc);
-}
-
-/*
- * idetape_queue_rw_tail generates a read/write request for the block
- * device interface and wait for it to be serviced.
- */
-static int idetape_queue_rw_tail (ide_drive_t *drive, int cmd, int blocks, struct buffer_head *bh)
-{
- idetape_tape_t *tape = drive->driver_data;
- struct request rq;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
-#endif /* IDETAPE_DEBUG_LOG */
-#if IDETAPE_DEBUG_BUGS
- if (idetape_pipeline_active (tape)) {
- printk (KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
- return (0);
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-
- ide_init_drive_cmd (&rq);
- rq.bh = bh;
- rq.cmd = cmd;
- rq.sector = tape->first_frame_position;
- rq.nr_sectors = rq.current_nr_sectors = blocks;
- if (tape->onstream)
- tape->postpone_cnt = 600;
- (void) ide_do_drive_cmd (drive, &rq, ide_wait);
-
- if (cmd != IDETAPE_READ_RQ && cmd != IDETAPE_WRITE_RQ)
- return 0;
-
- if (tape->merge_stage)
- idetape_init_merge_stage (tape);
- if (rq.errors == IDETAPE_ERROR_GENERAL)
- return -EIO;
- return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
-}
-
-/*
- * Read back the drive's internal buffer contents, as a part
- * of the write error recovery mechanism for old OnStream
- * firmware revisions.
- */
-static void idetape_onstream_read_back_buffer (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int frames, i, logical_blk_num;
- idetape_stage_t *stage, *first = NULL, *last = NULL;
- os_aux_t *aux;
- struct request *rq;
- unsigned char *p;
- unsigned long flags;
-
- idetape_update_stats(drive);
- frames = tape->cur_frames;
- logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num) - frames;
- printk(KERN_INFO "ide-tape: %s: reading back %d frames from the drive's internal buffer\n", tape->name, frames);
- for (i = 0; i < frames; i++) {
- stage = __idetape_kmalloc_stage(tape, 0, 0);
- if (!first)
- first = stage;
- aux = stage->aux;
- p = stage->bh->b_data;
- idetape_queue_rw_tail(drive, IDETAPE_READ_BUFFER_RQ, tape->capabilities.ctl, stage->bh);
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: read back logical block %d, data %x %x %x %x\n", tape->name, logical_blk_num, *p++, *p++, *p++, *p++);
-#endif
- rq = &stage->rq;
- ide_init_drive_cmd (rq);
- rq->cmd = IDETAPE_WRITE_RQ;
- rq->sector = tape->first_frame_position;
- rq->nr_sectors = rq->current_nr_sectors = tape->capabilities.ctl;
- idetape_init_stage(drive, stage, OS_FRAME_TYPE_DATA, logical_blk_num++);
- stage->next = NULL;
- if (last)
- last->next = stage;
- last = stage;
- }
- if (frames) {
- spin_lock_irqsave(&tape->spinlock, flags);
- last->next = tape->first_stage;
- tape->next_stage = tape->first_stage = first;
- tape->nr_stages += frames;
- tape->nr_pending_stages += frames;
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- idetape_update_stats(drive);
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: frames left in buffer: %d\n", tape->name, tape->cur_frames);
-#endif
-}
-
-/*
- * Error recovery algorithm for the OnStream tape.
- */
-static void idetape_onstream_write_error_recovery (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned int block;
-
- if (tape->onstream_write_error == 1) {
- printk(KERN_ERR "ide-tape: %s: detected physical bad block at %u\n", tape->name, ntohl(tape->sense.information));
- block = ntohl(tape->sense.information) + 80;
- idetape_update_stats(drive);
- printk(KERN_ERR "ide-tape: %s: relocating %d buffered logical blocks to physical block %u\n", tape->name, tape->cur_frames, block);
- idetape_update_stats(drive);
- if (tape->firmware_revision_num >= 106)
- idetape_position_tape(drive, block, 0, 1);
- else {
- idetape_onstream_read_back_buffer(drive);
- idetape_position_tape(drive, block, 0, 0);
- }
- idetape_read_position(drive);
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 1)
- printk(KERN_ERR "ide-tape: %s: positioning complete, cur_frames %d, pos %d, tape pos %d\n", tape->name, tape->cur_frames, tape->first_frame_position, tape->last_frame_position);
-#endif
- } else if (tape->onstream_write_error == 2) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 1)
- printk(KERN_INFO "ide-tape: %s: skipping over config partition\n", tape->name);
-#endif
- idetape_flush_tape_buffers(drive);
- block = idetape_read_position(drive);
- if (block != 0xba4)
- printk(KERN_ERR "ide-tape: warning, current position %d, expected %d\n", block, 0xba4);
- idetape_position_tape(drive, 0xbb8, 0, 0);
- }
- tape->onstream_write_error = 0;
-}
-
-/*
- * idetape_insert_pipeline_into_queue is used to start servicing the
- * pipeline stages, starting from tape->next_stage.
- */
-static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (tape->next_stage == NULL)
- return;
- if (!idetape_pipeline_active (tape)) {
- if (tape->onstream_write_error)
- idetape_onstream_write_error_recovery(drive);
- set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
- idetape_active_next_stage (drive);
- (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end);
- }
-}
-
-static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
-{
- idetape_init_pc(pc);
- pc->c[0] = IDETAPE_INQUIRY_CMD;
- pc->c[4] = pc->request_transfer = 254;
- pc->callback = &idetape_pc_callback;
-}
-
-static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_REWIND_CMD;
- if (tape->onstream)
- pc->c[1] = 1;
- set_bit (PC_WAIT_FOR_DSC, &pc->flags);
- pc->callback = &idetape_pc_callback;
-}
-
-static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length)
-{
- idetape_init_pc (pc);
- set_bit (PC_WRITING, &pc->flags);
- pc->c[0] = IDETAPE_MODE_SELECT_CMD;
- pc->c[1] = 0x10;
- put_unaligned (htons(length), (unsigned short *) &pc->c[3]);
- pc->request_transfer = 255;
- pc->callback = &idetape_pc_callback;
-}
-
-static void idetape_create_erase_cmd (idetape_pc_t *pc)
-{
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_ERASE_CMD;
- pc->c[1] = 1;
- set_bit (PC_WAIT_FOR_DSC, &pc->flags);
- pc->callback = &idetape_pc_callback;
-}
-
-static void idetape_create_space_cmd (idetape_pc_t *pc,int count,byte cmd)
-{
- idetape_init_pc (pc);
- pc->c[0] = IDETAPE_SPACE_CMD;
- put_unaligned (htonl (count), (unsigned int *) &pc->c[1]);
- pc->c[1] = cmd;
- set_bit (PC_WAIT_FOR_DSC, &pc->flags);
- pc->callback = &idetape_pc_callback;
-}
-
-/*
- * Verify that we have the correct tape frame
- */
-static int idetape_verify_stage (ide_drive_t *drive, idetape_stage_t *stage, int logical_blk_num, int quiet)
-{
- idetape_tape_t *tape = drive->driver_data;
- os_aux_t *aux = stage->aux;
- os_partition_t *par = &aux->partition;
- struct request *rq = &stage->rq;
- struct buffer_head *bh;
-
- if (!tape->onstream)
- return 1;
- if (tape->raw) {
- if (rq->errors) {
- bh = stage->bh;
- while (bh) {
- memset(bh->b_data, 0, bh->b_size);
- bh = bh->b_reqnext;
- }
- strcpy(stage->bh->b_data, "READ ERROR ON FRAME");
- }
- return 1;
- }
- if (rq->errors == IDETAPE_ERROR_GENERAL) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, read error\n", tape->name);
- return 0;
- }
- if (rq->errors == IDETAPE_ERROR_EOD) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, eod\n", tape->name);
- return 0;
- }
- if (ntohl(aux->format_id) != 0) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, format_id %u\n", tape->name, ntohl(aux->format_id));
- return 0;
- }
- if (memcmp(aux->application_sig, tape->application_sig, 4) != 0) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, incorrect application signature\n", tape->name);
- return 0;
- }
- if (aux->frame_type != OS_FRAME_TYPE_DATA &&
- aux->frame_type != OS_FRAME_TYPE_EOD &&
- aux->frame_type != OS_FRAME_TYPE_MARKER) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, frame type %x\n", tape->name, aux->frame_type);
- return 0;
- }
- if (par->partition_num != OS_DATA_PARTITION) {
- if (!tape->linux_media || tape->linux_media_version != 2) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, partition num %d\n", tape->name, par->partition_num);
- return 0;
- }
- }
- if (par->par_desc_ver != OS_PARTITION_VERSION) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, partition version %d\n", tape->name, par->par_desc_ver);
- return 0;
- }
- if (ntohs(par->wrt_pass_cntr) != tape->wrt_pass_cntr) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, wrt_pass_cntr %d (expected %d)(logical_blk_num %u)\n", tape->name, ntohs(par->wrt_pass_cntr), tape->wrt_pass_cntr, ntohl(aux->logical_blk_num));
- return 0;
- }
- if (aux->frame_seq_num != aux->logical_blk_num) {
- printk(KERN_INFO "ide-tape: %s: skipping frame, seq != logical\n", tape->name);
- return 0;
- }
- if (logical_blk_num != -1 && ntohl(aux->logical_blk_num) != logical_blk_num) {
- if (!quiet)
- printk(KERN_INFO "ide-tape: %s: skipping frame, logical_blk_num %u (expected %d)\n", tape->name, ntohl(aux->logical_blk_num), logical_blk_num);
- return 0;
- }
- if (aux->frame_type == OS_FRAME_TYPE_MARKER) {
- rq->errors = IDETAPE_ERROR_FILEMARK;
- rq->current_nr_sectors = rq->nr_sectors;
- }
- return 1;
-}
-
-static void idetape_wait_first_stage (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
- if (tape->first_stage == NULL)
- return;
- spin_lock_irqsave(&tape->spinlock, flags);
- if (tape->active_stage == tape->first_stage)
- idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
-}
-
-/*
- * idetape_add_chrdev_write_request tries to add a character device
- * originated write request to our pipeline. In case we don't succeed,
- * we revert to non-pipelined operation mode for this request.
- *
- * 1. Try to allocate a new pipeline stage.
- * 2. If we can't, wait for more and more requests to be serviced
- * and try again each time.
- * 3. If we still can't allocate a stage, fallback to
- * non-pipelined operation mode for this request.
- */
-static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *new_stage;
- unsigned long flags;
- struct request *rq;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 3)
- printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- /*
- * Attempt to allocate a new stage.
- * Pay special attention to possible race conditions.
- */
- while ((new_stage = idetape_kmalloc_stage (tape)) == NULL) {
- spin_lock_irqsave(&tape->spinlock, flags);
- if (idetape_pipeline_active (tape)) {
- idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- } else {
- spin_unlock_irqrestore(&tape->spinlock, flags);
- idetape_insert_pipeline_into_queue (drive);
- if (idetape_pipeline_active (tape))
- continue;
- /*
- * Linux is short on memory. Fallback to
- * non-pipelined operation mode for this request.
- */
- return idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh);
- }
- }
- rq = &new_stage->rq;
- ide_init_drive_cmd (rq);
- rq->cmd = IDETAPE_WRITE_RQ;
- rq->sector = tape->first_frame_position; /* Doesn't actually matter - We always assume sequential access */
- rq->nr_sectors = rq->current_nr_sectors = blocks;
-
- idetape_switch_buffers (tape, new_stage);
- idetape_init_stage(drive, new_stage, OS_FRAME_TYPE_DATA, tape->logical_blk_num);
- tape->logical_blk_num++;
- idetape_add_stage_tail (drive,new_stage);
- tape->pipeline_head++;
-#if USE_IOTRACE
- IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
-#endif
- calculate_speeds(drive);
-
- /*
- * Estimate whether the tape has stopped writing by checking
- * if our write pipeline is currently empty. If we are not
- * writing anymore, wait for the pipeline to be full enough
- * (90%) before starting to service requests, so that we will
- * be able to keep up with the higher speeds of the tape.
- *
- * For the OnStream drive, we can query the number of pending
- * frames in the drive's internal buffer. As long as the tape
- * is still writing, it is better to write frames immediately
- * rather than gather them in the pipeline. This will give the
- * tape's firmware the ability to sense the current incoming
- * data rate more accurately, and since the OnStream tape
- * supports variable speeds, it can try to adjust itself to the
- * incoming data rate.
- */
- if (!idetape_pipeline_active(tape)) {
- if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
- tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
- tape->measure_insert_time = 1;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- tape->insert_speed = 0;
- idetape_insert_pipeline_into_queue (drive);
- } else if (tape->onstream) {
- idetape_update_stats(drive);
- if (tape->cur_frames > 5)
- idetape_insert_pipeline_into_queue (drive);
- }
- }
- if (test_and_clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags)) /* Return a deferred error */
- return -EIO;
- return blocks;
-}
-
-/*
- * idetape_wait_for_pipeline will wait until all pending pipeline
- * requests are serviced. Typically called on device close.
- */
-static void idetape_wait_for_pipeline (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
-
- while (tape->next_stage || idetape_pipeline_active(tape)) {
- idetape_insert_pipeline_into_queue (drive);
- spin_lock_irqsave(&tape->spinlock, flags);
- if (idetape_pipeline_active(tape))
- idetape_wait_for_request(drive, tape->active_data_request);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
-}
-
-static void idetape_empty_write_pipeline (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int blocks, i, min;
- struct buffer_head *bh;
-
-#if IDETAPE_DEBUG_BUGS
- if (tape->chrdev_direction != idetape_direction_write) {
- printk (KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
- return;
- }
- if (tape->merge_stage_size > tape->stage_size) {
- printk (KERN_ERR "ide-tape: bug: merge_buffer too big\n");
- tape->merge_stage_size = tape->stage_size;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- if (tape->merge_stage_size) {
- blocks=tape->merge_stage_size/tape->tape_block_size;
- if (tape->merge_stage_size % tape->tape_block_size) {
- blocks++;
- i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
- bh = tape->bh->b_reqnext;
- while (bh) {
- atomic_set(&bh->b_count, 0);
- bh = bh->b_reqnext;
- }
- bh = tape->bh;
- while (i) {
- if (bh == NULL) {
- printk(KERN_INFO "ide-tape: bug, bh NULL\n");
- break;
- }
- min = IDE_MIN(i, bh->b_size - atomic_read(&bh->b_count));
- memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
- atomic_add(min, &bh->b_count);
- i -= min;
- bh = bh->b_reqnext;
- }
- }
- (void) idetape_add_chrdev_write_request (drive, blocks);
- tape->merge_stage_size = 0;
- }
- idetape_wait_for_pipeline (drive);
- if (tape->merge_stage != NULL) {
- __idetape_kfree_stage (tape->merge_stage);
- tape->merge_stage = NULL;
- }
- clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
- tape->chrdev_direction=idetape_direction_none;
-
- /*
- * On the next backup, perform the feedback loop again.
- * (I don't want to keep sense information between backups,
- * as some systems are constantly on, and the system load
- * can be totally different on the next backup).
- */
- tape->max_stages = tape->min_pipeline;
-#if IDETAPE_DEBUG_BUGS
- if (tape->first_stage != NULL || tape->next_stage != NULL || tape->last_stage != NULL || tape->nr_stages != 0) {
- printk (KERN_ERR "ide-tape: ide-tape pipeline bug, "
- "first_stage %p, next_stage %p, last_stage %p, nr_stages %d\n",
- tape->first_stage, tape->next_stage, tape->last_stage, tape->nr_stages);
- }
-#endif /* IDETAPE_DEBUG_BUGS */
-}
-
-static void idetape_restart_speed_control (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- tape->restart_speed_control_req = 0;
- tape->pipeline_head = 0;
- tape->buffer_head = tape->tape_head = tape->cur_frames;
- tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
- tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
- tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
- tape->uncontrolled_pipeline_head_speed = 0;
- tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
- tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
-}
-
-static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *new_stage;
- struct request rq;
- int bytes_read;
- int blocks = tape->capabilities.ctl;
-
- if (tape->chrdev_direction != idetape_direction_read) { /* Initialize read operation */
- if (tape->chrdev_direction == idetape_direction_write) {
- idetape_empty_write_pipeline (drive);
- idetape_flush_tape_buffers (drive);
- }
-#if IDETAPE_DEBUG_BUGS
- if (tape->merge_stage || tape->merge_stage_size) {
- printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
- tape->merge_stage_size = 0;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL)
- return -ENOMEM;
- tape->chrdev_direction = idetape_direction_read;
- tape->logical_blk_num = 0;
-
- /*
- * Issue a read 0 command to ensure that DSC handshake
- * is switched from completion mode to buffer available
- * mode.
- */
- bytes_read = idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 0, tape->merge_stage->bh);
- if (bytes_read < 0) {
- kfree (tape->merge_stage);
- tape->merge_stage = NULL;
- tape->chrdev_direction = idetape_direction_none;
- return bytes_read;
- }
- }
- if (tape->restart_speed_control_req)
- idetape_restart_speed_control(drive);
- ide_init_drive_cmd (&rq);
- rq.cmd = IDETAPE_READ_RQ;
- rq.sector = tape->first_frame_position;
- rq.nr_sectors = rq.current_nr_sectors = blocks;
- if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && tape->nr_stages <= max_stages) {
- new_stage=idetape_kmalloc_stage (tape);
- while (new_stage != NULL) {
- new_stage->rq=rq;
- idetape_add_stage_tail (drive,new_stage);
- if (tape->nr_stages >= max_stages)
- break;
- new_stage=idetape_kmalloc_stage (tape);
- }
- }
- if (!idetape_pipeline_active(tape)) {
- if (tape->nr_pending_stages >= 3 * max_stages / 4) {
- tape->measure_insert_time = 1;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- tape->insert_speed = 0;
- idetape_insert_pipeline_into_queue (drive);
- } else if (tape->onstream) {
- idetape_update_stats(drive);
- if (tape->cur_frames < tape->max_frames - 5)
- idetape_insert_pipeline_into_queue (drive);
- }
- }
- return 0;
-}
-
-static int idetape_get_logical_blk (ide_drive_t *drive, int logical_blk_num, int max_stages, int quiet)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- int cnt = 0, x, position;
-
- /*
- * Search and wait for the next logical tape block
- */
- while (1) {
- if (cnt++ > 1000) { /* AJN: was 100 */
- printk(KERN_INFO "ide-tape: %s: couldn't find logical block %d, aborting\n", tape->name, logical_blk_num);
- return 0;
- }
- idetape_initiate_read(drive, max_stages);
- if (tape->first_stage == NULL) {
- if (tape->onstream) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 1)
- printk(KERN_INFO "ide-tape: %s: first_stage == NULL, pipeline error %ld\n", tape->name, (long)test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags));
-#endif
- clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
- position = idetape_read_position(drive);
- printk(KERN_INFO "ide-tape: %s: blank block detected, positioning tape to block %d\n", tape->name, position + 60);
- idetape_position_tape(drive, position + 60, 0, 1);
- cnt += 40;
- continue;
- } else
- return 0;
- }
- idetape_wait_first_stage(drive);
- if (idetape_verify_stage(drive, tape->first_stage, logical_blk_num, quiet))
- break;
- if (tape->first_stage->rq.errors == IDETAPE_ERROR_EOD)
- cnt--;
- if (idetape_verify_stage(drive, tape->first_stage, -1, quiet)) {
- x = ntohl(tape->first_stage->aux->logical_blk_num);
- if (x > logical_blk_num) {
- printk(KERN_ERR "ide-tape: %s: couldn't find logical block %d, aborting (block %d found)\n", tape->name, logical_blk_num, x);
- return 0;
- }
- }
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head(drive);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- if (tape->onstream)
- tape->logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num);
- return 1;
-}
-
-/*
- * idetape_add_chrdev_read_request is called from idetape_chrdev_read
- * to service a character device read request and add read-ahead
- * requests to our pipeline.
- */
-static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
-{
- idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- struct request *rq_ptr;
- int bytes_read;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
-#endif /* IDETAPE_DEBUG_LOG */
-
- /*
- * Wait for the next logical block to be available at the head
- * of the pipeline
- */
- if (!idetape_get_logical_blk(drive, tape->logical_blk_num, tape->max_stages, 0)) {
- if (tape->onstream) {
- set_bit(IDETAPE_READ_ERROR, &tape->flags);
- return 0;
- }
- if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
- return 0;
- return idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, blocks, tape->merge_stage->bh);
- }
- rq_ptr = &tape->first_stage->rq;
- bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
- rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
-
-
- if (tape->onstream && !tape->raw && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: EOD reached\n", tape->name);
-#endif
- return 0;
- }
- if (rq_ptr->errors == IDETAPE_ERROR_EOD)
- return 0;
- else if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
- set_bit (IDETAPE_FILEMARK, &tape->flags);
- else {
- idetape_switch_buffers (tape, tape->first_stage);
- if (rq_ptr->errors == IDETAPE_ERROR_GENERAL) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 1)
- printk(KERN_INFO "ide-tape: error detected, bytes_read %d\n", bytes_read);
-#endif
- }
- clear_bit (IDETAPE_FILEMARK, &tape->flags);
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- tape->logical_blk_num++;
- tape->pipeline_head++;
-#if USE_IOTRACE
- IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
-#endif
- calculate_speeds(drive);
- }
-#if IDETAPE_DEBUG_BUGS
- if (bytes_read > blocks*tape->tape_block_size) {
- printk (KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
- bytes_read=blocks*tape->tape_block_size;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- return (bytes_read);
-}
-
-static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
-{
- idetape_tape_t *tape = drive->driver_data;
- struct buffer_head *bh;
- int count, blocks;
-
- while (bcount) {
- bh = tape->merge_stage->bh;
- count = IDE_MIN (tape->stage_size, bcount);
- bcount -= count;
- blocks = count / tape->tape_block_size;
- while (count) {
- atomic_set(&bh->b_count, IDE_MIN (count, bh->b_size));
- memset (bh->b_data, 0, atomic_read(&bh->b_count));
- count -= atomic_read(&bh->b_count);
- bh = bh->b_reqnext;
- }
- idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh);
- }
-}
-
-static int idetape_pipeline_size (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
- struct request *rq;
- int size = 0;
-
- idetape_wait_for_pipeline (drive);
- stage = tape->first_stage;
- while (stage != NULL) {
- rq = &stage->rq;
- size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
- if (rq->errors == IDETAPE_ERROR_FILEMARK)
- size += tape->tape_block_size;
- stage = stage->next;
- }
- size += tape->merge_stage_size;
- return size;
-}
-
-/*
- * Rewinds the tape to the Beginning Of the current Partition (BOP).
- *
- * We currently support only one partition.
- */
-static int idetape_rewind_tape (ide_drive_t *drive)
-{
- int retval;
- idetape_pc_t pc;
- idetape_tape_t *tape = drive->driver_data;
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk (KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- idetape_create_rewind_cmd (drive, &pc);
- retval=idetape_queue_pc_tail (drive,&pc);
- if (retval) return retval;
-
- idetape_create_read_position_cmd (&pc);
- retval = idetape_queue_pc_tail (drive,&pc);
- if (retval) return retval;
- tape->logical_blk_num = 0;
- return 0;
-}
-
-/*
- * Our special ide-tape ioctl's.
- *
- * Currently there aren't any ioctl's.
- * mtio.h compatible commands should be issued to the character device
- * interface.
- */
-static int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_config_t config;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 4)
- printk (KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
-#endif /* IDETAPE_DEBUG_LOG */
- switch (cmd) {
- case 0x0340:
- if (copy_from_user ((char *) &config, (char *) arg, sizeof (idetape_config_t)))
- return -EFAULT;
- tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
- tape->max_stages = config.nr_stages;
- break;
- case 0x0350:
- config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
- config.nr_stages = tape->max_stages;
- if (copy_to_user ((char *) arg, (char *) &config, sizeof (idetape_config_t)))
- return -EFAULT;
- break;
- default:
- return -EIO;
- }
- return 0;
-}
-
-/*
- * The block device interface should not be used for data transfers.
- * However, we still allow opening it so that we can issue general
- * ide driver configuration ioctl's, such as the interrupt unmask feature.
- */
-static int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
-{
- MOD_INC_USE_COUNT;
-#if ONSTREAM_DEBUG
- printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_blkdev_open\n");
-#endif
- return 0;
-}
-
-static void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
-{
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_blkdev_release\n");
-#endif
-}
-
-/*
- * idetape_pre_reset is called before an ATAPI/ATA software reset.
- */
-static void idetape_pre_reset (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- if (tape != NULL)
- set_bit (IDETAPE_IGNORE_DSC, &tape->flags);
-}
-
-/*
- * Character device interface functions
- */
-static ide_drive_t *get_drive_ptr (kdev_t i_rdev)
-{
- unsigned int i = MINOR(i_rdev) & ~0xc0;
-
- if (i >= MAX_HWIFS * MAX_DRIVES)
- return NULL;
- return (idetape_chrdevs[i].drive);
-}
-
-static int idetape_onstream_space_over_filemarks_backward (ide_drive_t *drive,short mt_op,int mt_count)
-{
- idetape_tape_t *tape = drive->driver_data;
- int cnt = 0;
- int last_mark_addr;
- unsigned long flags;
-
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_bwd\n", tape->name);
- return -EIO;
- }
- while (cnt != mt_count) {
- last_mark_addr = ntohl(tape->first_stage->aux->last_mark_addr);
- if (last_mark_addr == -1)
- return -EIO;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: positioning to last mark at %d\n", last_mark_addr);
-#endif
- idetape_position_tape(drive, last_mark_addr, 0, 0);
- cnt++;
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name);
- return -EIO;
- }
- if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) {
- printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, last_mark_addr);
- return -EIO;
- }
- }
- if (mt_op == MTBSFM) {
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- tape->logical_blk_num++;
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- return 0;
-}
-
-/*
- * ADRL 1.1 compatible "slow" space filemarks fwd version
- *
- * Just scans for the filemark sequentially.
- */
-static int idetape_onstream_space_over_filemarks_forward_slow (ide_drive_t *drive,short mt_op,int mt_count)
-{
- idetape_tape_t *tape = drive->driver_data;
- int cnt = 0;
- unsigned long flags;
-
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name);
- return -EIO;
- }
- while (1) {
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name);
- return -EIO;
- }
- if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER)
- cnt++;
- if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name);
-#endif
- return -EIO;
- }
- if (cnt == mt_count)
- break;
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- if (mt_op == MTFSF) {
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- tape->logical_blk_num++;
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- return 0;
-}
-
-
-/*
- * Fast linux specific version of OnStream FSF
- */
-static int idetape_onstream_space_over_filemarks_forward_fast (ide_drive_t *drive,short mt_op,int mt_count)
-{
- idetape_tape_t *tape = drive->driver_data;
- int cnt = 0, next_mark_addr;
- unsigned long flags;
-
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name);
- return -EIO;
- }
-
- /*
- * Find nearest (usually previous) marker
- */
- while (1) {
- if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER)
- break;
- if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name);
-#endif
- return -EIO;
- }
- if (ntohl(tape->first_stage->aux->filemark_cnt) == 0) {
- if (tape->first_mark_addr == -1) {
- printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name);
- return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count);
- }
- idetape_position_tape(drive, tape->first_mark_addr, 0, 0);
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd_fast\n", tape->name);
- return -EIO;
- }
- if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) {
- printk(KERN_INFO "ide-tape: %s: expected to find filemark at %d\n", tape->name, tape->first_mark_addr);
- return -EIO;
- }
- } else {
- if (idetape_onstream_space_over_filemarks_backward(drive, MTBSF, 1) < 0)
- return -EIO;
- mt_count++;
- }
- }
- cnt++;
- while (cnt != mt_count) {
- next_mark_addr = ntohl(tape->first_stage->aux->next_mark_addr);
- if (!next_mark_addr || next_mark_addr > tape->eod_frame_addr) {
- printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name);
- return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count - cnt);
-#if ONSTREAM_DEBUG
- } else if (tape->debug_level >= 2) {
- printk(KERN_INFO "ide-tape: positioning to next mark at %d\n", next_mark_addr);
-#endif
- }
- idetape_position_tape(drive, next_mark_addr, 0, 0);
- cnt++;
- if (!idetape_get_logical_blk(drive, -1, 10, 0)) {
- printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name);
- return -EIO;
- }
- if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) {
- printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, next_mark_addr);
- return -EIO;
- }
- }
- if (mt_op == MTFSF) {
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- tape->logical_blk_num++;
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- return 0;
-}
-
-/*
- * idetape_space_over_filemarks is now a bit more complicated than just
- * passing the command to the tape since we may have crossed some
- * filemarks during our pipelined read-ahead mode.
- *
- * As a minor side effect, the pipeline enables us to support MTFSFM when
- * the filemark is in our internal pipeline even if the tape doesn't
- * support spacing over filemarks in the reverse direction.
- */
-static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
- unsigned long flags;
- int retval,count=0;
- int speed_control;
-
- if (tape->onstream) {
- if (tape->raw)
- return -EIO;
- speed_control = tape->speed_control;
- tape->speed_control = 0;
- if (mt_op == MTFSF || mt_op == MTFSFM) {
- if (tape->linux_media)
- retval = idetape_onstream_space_over_filemarks_forward_fast(drive, mt_op, mt_count);
- else
- retval = idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count);
- } else
- retval = idetape_onstream_space_over_filemarks_backward(drive, mt_op, mt_count);
- tape->speed_control = speed_control;
- tape->restart_speed_control_req = 1;
- return retval;
- }
-
- if (tape->chrdev_direction == idetape_direction_read) {
- /*
- * We have a read-ahead buffer. Scan it for crossed
- * filemarks.
- */
- tape->merge_stage_size = 0;
- clear_bit (IDETAPE_FILEMARK, &tape->flags);
- while (tape->first_stage != NULL) {
- idetape_wait_first_stage(drive);
- if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
- count++;
- if (count == mt_count) {
- switch (mt_op) {
- case MTFSF:
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- case MTFSFM:
- return (0);
- default:
- break;
- }
- }
- spin_lock_irqsave(&tape->spinlock, flags);
- idetape_remove_stage_head (drive);
- spin_unlock_irqrestore(&tape->spinlock, flags);
- }
- idetape_discard_read_pipeline (drive, 1);
- }
-
- /*
- * The filemark was not found in our internal pipeline.
- * Now we can issue the space command.
- */
- switch (mt_op) {
- case MTFSF:
- idetape_create_space_cmd (&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTFSFM:
- if (!tape->capabilities.sprev)
- return (-EIO);
- retval = idetape_space_over_filemarks (drive, MTFSF, mt_count-count);
- if (retval) return (retval);
- return (idetape_space_over_filemarks (drive, MTBSF, 1));
- case MTBSF:
- if (!tape->capabilities.sprev)
- return (-EIO);
- idetape_create_space_cmd (&pc,-(mt_count+count),IDETAPE_SPACE_OVER_FILEMARK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTBSFM:
- if (!tape->capabilities.sprev)
- return (-EIO);
- retval = idetape_space_over_filemarks (drive, MTBSF, mt_count+count);
- if (retval) return (retval);
- return (idetape_space_over_filemarks (drive, MTFSF, 1));
- default:
- printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
- return (-EIO);
- }
-}
-
-
-/*
- * Our character device read / write functions.
- *
- * The tape is optimized to maximize throughput when it is transferring
- * an integral number of the "continuous transfer limit", which is
- * a parameter of the specific tape (26 KB on my particular tape).
- * (32 kB for Onstream)
- *
- * As of version 1.3 of the driver, the character device provides an
- * abstract continuous view of the media - any mix of block sizes (even 1
- * byte) on the same backup/restore procedure is supported. The driver
- * will internally convert the requests to the recommended transfer unit,
- * so that an unmatch between the user's block size to the recommended
- * size will only result in a (slightly) increased driver overhead, but
- * will no longer hit performance.
- * This is not applicable to Onstream.
- */
-static ssize_t idetape_chrdev_read (struct file *file, char *buf,
- size_t count, loff_t *ppos)
-{
- struct inode *inode = file->f_dentry->d_inode;
- ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
- idetape_tape_t *tape = drive->driver_data;
- ssize_t bytes_read,temp,actually_read=0, rc;
-
- if (ppos != &file->f_pos) {
- /* "A request was outside the capabilities of the device." */
- return -ENXIO;
- }
- if (tape->onstream && (count != tape->tape_block_size)) {
- printk(KERN_ERR "ide-tape: %s: use %d bytes as block size (%Zd used)\n", tape->name, tape->tape_block_size, count);
- return -EINVAL;
- }
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 3)
- printk (KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->chrdev_direction != idetape_direction_read) {
- if (test_bit (IDETAPE_DETECT_BS, &tape->flags))
- if (count > tape->tape_block_size && (count % tape->tape_block_size) == 0)
- tape->user_bs_factor = count / tape->tape_block_size;
- }
- if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
- return rc;
- if (count==0)
- return (0);
- if (tape->merge_stage_size) {
- actually_read=IDE_MIN (tape->merge_stage_size,count);
- idetape_copy_stage_to_user (tape, buf, tape->merge_stage, actually_read);
- buf += actually_read; tape->merge_stage_size -= actually_read; count-=actually_read;
- }
- while (count >= tape->stage_size) {
- bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl);
- if (bytes_read <= 0)
- goto finish;
- idetape_copy_stage_to_user (tape, buf, tape->merge_stage, bytes_read);
- buf += bytes_read; count -= bytes_read; actually_read += bytes_read;
- }
- if (count) {
- bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl);
- if (bytes_read <= 0)
- goto finish;
- temp=IDE_MIN (count,bytes_read);
- idetape_copy_stage_to_user (tape, buf, tape->merge_stage, temp);
- actually_read+=temp;
- tape->merge_stage_size=bytes_read-temp;
- }
-finish:
- if (!actually_read && test_bit (IDETAPE_FILEMARK, &tape->flags)) {
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
-#endif
- idetape_space_over_filemarks (drive, MTFSF, 1);
- return 0;
- }
- if (tape->onstream && !actually_read && test_and_clear_bit(IDETAPE_READ_ERROR, &tape->flags)) {
- printk(KERN_ERR "ide-tape: %s: unrecovered read error on logical block number %d, skipping\n", tape->name, tape->logical_blk_num);
- tape->logical_blk_num++;
- return -EIO;
- }
- return actually_read;
-}
-
-static void idetape_update_last_marker (ide_drive_t *drive, int last_mark_addr, int next_mark_addr)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
- os_aux_t *aux;
- int position;
-
- if (!tape->onstream || tape->raw)
- return;
- if (last_mark_addr == -1)
- return;
- stage = __idetape_kmalloc_stage(tape, 0, 0);
- if (stage == NULL)
- return;
- idetape_flush_tape_buffers(drive);
- position = idetape_read_position(drive);
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: current position (2) %d, lblk %d\n", position, tape->logical_blk_num);
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: current position (2) tape block %d\n", tape->last_frame_position);
-#endif
- idetape_position_tape(drive, last_mark_addr, 0, 0);
- if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bh)) {
- printk(KERN_INFO "ide-tape: %s: couldn't read last marker\n", tape->name);
- __idetape_kfree_stage (stage);
- idetape_position_tape(drive, position, 0, 0);
- return;
- }
- aux = stage->aux;
- if (aux->frame_type != OS_FRAME_TYPE_MARKER) {
- printk(KERN_INFO "ide-tape: %s: expected to find marker at addr %d\n", tape->name, last_mark_addr);
- __idetape_kfree_stage (stage);
- idetape_position_tape(drive, position, 0, 0);
- return;
- }
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: writing back marker\n");
-#endif
- aux->next_mark_addr = htonl(next_mark_addr);
- idetape_position_tape(drive, last_mark_addr, 0, 0);
- if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) {
- printk(KERN_INFO "ide-tape: %s: couldn't write back marker frame at %d\n", tape->name, last_mark_addr);
- __idetape_kfree_stage (stage);
- idetape_position_tape(drive, position, 0, 0);
- return;
- }
- __idetape_kfree_stage (stage);
- idetape_flush_tape_buffers (drive);
- idetape_position_tape(drive, position, 0, 0);
- return;
-}
-
-static void __idetape_write_header (ide_drive_t *drive, int block, int cnt)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
- os_header_t header;
-
- stage = __idetape_kmalloc_stage(tape, 1, 1);
- if (stage == NULL)
- return;
- idetape_init_stage(drive, stage, OS_FRAME_TYPE_HEADER, tape->logical_blk_num);
- idetape_wait_ready(drive, 60 * 5 * HZ);
- idetape_position_tape(drive, block, 0, 0);
- memset(&header, 0, sizeof(header));
- strcpy(header.ident_str, "ADR_SEQ");
- header.major_rev = 1;
- header.minor_rev = 2;
- header.par_num = 1;
- header.partition.partition_num = OS_DATA_PARTITION;
- header.partition.par_desc_ver = OS_PARTITION_VERSION;
- header.partition.first_frame_addr = htonl(0x14);
- header.partition.last_frame_addr = htonl(19239 * 24);
- header.partition.wrt_pass_cntr = htons(tape->wrt_pass_cntr);
- header.partition.eod_frame_addr = htonl(tape->eod_frame_addr);
- memcpy(stage->bh->b_data, &header, sizeof(header));
- while (cnt--) {
- if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) {
- printk(KERN_INFO "ide-tape: %s: couldn't write header frame\n", tape->name);
- __idetape_kfree_stage (stage);
- return;
- }
- }
- __idetape_kfree_stage (stage);
- idetape_flush_tape_buffers (drive);
-}
-
-static void idetape_write_header (ide_drive_t *drive, int locate_eod)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: writing tape header\n", tape->name);
-#endif
- if (!tape->onstream || tape->raw)
- return;
- tape->update_frame_cntr++;
- __idetape_write_header(drive, 5, 5);
- __idetape_write_header(drive, 0xbae, 5);
- if (locate_eod) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: locating back to eod frame addr %d\n", tape->name, tape->eod_frame_addr);
-#endif
- idetape_position_tape(drive, tape->eod_frame_addr, 0, 0);
- }
-}
-
-static ssize_t idetape_chrdev_write (struct file *file, const char *buf,
- size_t count, loff_t *ppos)
-{
- struct inode *inode = file->f_dentry->d_inode;
- ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
- idetape_tape_t *tape = drive->driver_data;
- ssize_t retval,actually_written=0;
- int position;
-
- if (ppos != &file->f_pos) {
- /* "A request was outside the capabilities of the device." */
- return -ENXIO;
- }
- if (tape->onstream && (count != tape->tape_block_size)) {
- printk(KERN_ERR "ide-tape: %s: use %d bytes as block size (%Zd used)\n", tape->name, tape->tape_block_size, count);
- return -EINVAL;
- }
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 3)
- printk (KERN_INFO "ide-tape: Reached idetape_chrdev_write, count %Zd\n", count);
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->chrdev_direction != idetape_direction_write) { /* Initialize write operation */
- if (tape->chrdev_direction == idetape_direction_read)
- idetape_discard_read_pipeline (drive, 1);
-#if IDETAPE_DEBUG_BUGS
- if (tape->merge_stage || tape->merge_stage_size) {
- printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
- tape->merge_stage_size = 0;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL)
- return -ENOMEM;
- tape->chrdev_direction = idetape_direction_write;
- idetape_init_merge_stage (tape);
-
- if (tape->onstream) {
- position = idetape_read_position(drive);
- if (position <= 20) {
- tape->logical_blk_num = 0;
- tape->wrt_pass_cntr++;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: logical block num 0, setting eod to 20\n", tape->name);
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: allocating new write pass counter %d\n", tape->name, tape->wrt_pass_cntr);
-#endif
- tape->filemark_cnt = 0;
- tape->eod_frame_addr = 20;
- tape->first_mark_addr = tape->last_mark_addr = -1;
- idetape_write_header(drive, 1);
- }
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr);
-#endif
- position = idetape_read_position(drive);
- if (position != tape->eod_frame_addr)
- idetape_position_tape(drive, tape->eod_frame_addr, 0, 0);
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: first_frame_position %d\n", tape->name, tape->first_frame_position);
-#endif
- }
-
- /*
- * Issue a write 0 command to ensure that DSC handshake
- * is switched from completion mode to buffer available
- * mode.
- */
- retval = idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 0, tape->merge_stage->bh);
- if (retval < 0) {
- kfree (tape->merge_stage);
- tape->merge_stage = NULL;
- tape->chrdev_direction = idetape_direction_none;
- return retval;
- }
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk("ide-tape: first_frame_position %d\n", tape->first_frame_position);
-#endif
- }
- if (count==0)
- return (0);
- if (tape->restart_speed_control_req)
- idetape_restart_speed_control(drive);
- if (tape->merge_stage_size) {
-#if IDETAPE_DEBUG_BUGS
- if (tape->merge_stage_size >= tape->stage_size) {
- printk (KERN_ERR "ide-tape: bug: merge buffer too big\n");
- tape->merge_stage_size=0;
- }
-#endif /* IDETAPE_DEBUG_BUGS */
- actually_written=IDE_MIN (tape->stage_size-tape->merge_stage_size,count);
- idetape_copy_stage_from_user (tape, tape->merge_stage, buf, actually_written);
- buf+=actually_written;tape->merge_stage_size+=actually_written;count-=actually_written;
-
- if (tape->merge_stage_size == tape->stage_size) {
- tape->merge_stage_size = 0;
- retval=idetape_add_chrdev_write_request (drive, tape->capabilities.ctl);
- if (retval <= 0)
- return (retval);
- }
- }
- while (count >= tape->stage_size) {
- idetape_copy_stage_from_user (tape, tape->merge_stage, buf, tape->stage_size);
- buf+=tape->stage_size;count-=tape->stage_size;
- retval=idetape_add_chrdev_write_request (drive, tape->capabilities.ctl);
- actually_written+=tape->stage_size;
- if (retval <= 0)
- return (retval);
- }
- if (count) {
- actually_written+=count;
- idetape_copy_stage_from_user (tape, tape->merge_stage, buf, count);
- tape->merge_stage_size+=count;
- }
- return (actually_written);
-}
-
-static int idetape_write_filemark (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int last_mark_addr;
- idetape_pc_t pc;
-
- if (!tape->onstream) {
- idetape_create_write_filemark_cmd(drive, &pc,1); /* Write a filemark */
- if (idetape_queue_pc_tail (drive,&pc)) {
- printk (KERN_ERR "ide-tape: Couldn't write a filemark\n");
- return -EIO;
- }
- } else if (!tape->raw) {
- last_mark_addr = idetape_read_position(drive);
- tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0);
- if (tape->merge_stage != NULL) {
- idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_MARKER, tape->logical_blk_num);
- idetape_pad_zeros (drive, tape->stage_size);
- tape->logical_blk_num++;
- __idetape_kfree_stage (tape->merge_stage);
- tape->merge_stage = NULL;
- }
- if (tape->filemark_cnt)
- idetape_update_last_marker(drive, tape->last_mark_addr, last_mark_addr);
- tape->last_mark_addr = last_mark_addr;
- if (tape->filemark_cnt++ == 0)
- tape->first_mark_addr = last_mark_addr;
- }
- return 0;
-}
-
-static void idetape_write_eod (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (!tape->onstream || tape->raw)
- return;
- tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0);
- if (tape->merge_stage != NULL) {
- tape->eod_frame_addr = idetape_read_position(drive);
- idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_EOD, tape->logical_blk_num);
- idetape_pad_zeros (drive, tape->stage_size);
- __idetape_kfree_stage (tape->merge_stage);
- tape->merge_stage = NULL;
- }
- return;
-}
-
-int idetape_seek_logical_blk (ide_drive_t *drive, int logical_blk_num)
-{
- idetape_tape_t *tape = drive->driver_data;
- int estimated_address = logical_blk_num + 20;
- int retries = 0;
- int speed_control;
-
- speed_control = tape->speed_control;
- tape->speed_control = 0;
- if (logical_blk_num < 0)
- logical_blk_num = 0;
- if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1))
- goto ok;
- while (++retries < 10) {
- idetape_discard_read_pipeline(drive, 0);
- idetape_position_tape(drive, estimated_address, 0, 0);
- if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1))
- goto ok;
- if (!idetape_get_logical_blk(drive, -1, 10, 1))
- goto error;
- if (tape->logical_blk_num < logical_blk_num)
- estimated_address += logical_blk_num - tape->logical_blk_num;
- else
- break;
- }
-error:
- tape->speed_control = speed_control;
- tape->restart_speed_control_req = 1;
- printk(KERN_INFO "ide-tape: %s: couldn't seek to logical block %d (at %d), %d retries\n", tape->name, logical_blk_num, tape->logical_blk_num, retries);
- return -EIO;
-ok:
- tape->speed_control = speed_control;
- tape->restart_speed_control_req = 1;
- return 0;
-}
-
-/*
- * idetape_mtioctop is called from idetape_chrdev_ioctl when
- * the general mtio MTIOCTOP ioctl is requested.
- *
- * We currently support the following mtio.h operations:
- *
- * MTFSF - Space over mt_count filemarks in the positive direction.
- * The tape is positioned after the last spaced filemark.
- *
- * MTFSFM - Same as MTFSF, but the tape is positioned before the
- * last filemark.
- *
- * MTBSF - Steps background over mt_count filemarks, tape is
- * positioned before the last filemark.
- *
- * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
- *
- * Note:
- *
- * MTBSF and MTBSFM are not supported when the tape doesn't
- * supports spacing over filemarks in the reverse direction.
- * In this case, MTFSFM is also usually not supported (it is
- * supported in the rare case in which we crossed the filemark
- * during our read-ahead pipelined operation mode).
- *
- * MTWEOF - Writes mt_count filemarks. Tape is positioned after
- * the last written filemark.
- *
- * MTREW - Rewinds tape.
- *
- * MTLOAD - Loads the tape.
- *
- * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
- * MTUNLOAD prevents further access until the media is replaced.
- *
- * MTNOP - Flushes tape buffers.
- *
- * MTRETEN - Retension media. This typically consists of one end
- * to end pass on the media.
- *
- * MTEOM - Moves to the end of recorded data.
- *
- * MTERASE - Erases tape.
- *
- * MTSETBLK - Sets the user block size to mt_count bytes. If
- * mt_count is 0, we will attempt to autodetect
- * the block size.
- *
- * MTSEEK - Positions the tape in a specific block number, where
- * each block is assumed to contain which user_block_size
- * bytes.
- *
- * MTSETPART - Switches to another tape partition.
- *
- * MTLOCK - Locks the tape door.
- *
- * MTUNLOCK - Unlocks the tape door.
- *
- * The following commands are currently not supported:
- *
- * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
- * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
- */
-static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
- int i,retval;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 1)
- printk (KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",mt_op,mt_count);
-#endif /* IDETAPE_DEBUG_LOG */
- /*
- * Commands which need our pipelined read-ahead stages.
- */
- switch (mt_op) {
- case MTFSF:
- case MTFSFM:
- case MTBSF:
- case MTBSFM:
- if (!mt_count)
- return (0);
- return (idetape_space_over_filemarks (drive,mt_op,mt_count));
- default:
- break;
- }
- switch (mt_op) {
- case MTWEOF:
- idetape_discard_read_pipeline (drive, 1);
- for (i = 0; i < mt_count; i++) {
- retval = idetape_write_filemark(drive);
- if (retval) return retval;
- }
- return (0);
- case MTREW:
- idetape_discard_read_pipeline (drive, 0);
- if (idetape_rewind_tape(drive))
- return -EIO;
- if (tape->onstream && !tape->raw)
- return idetape_position_tape(drive, 20, 0, 0);
- return 0;
- case MTLOAD:
- idetape_discard_read_pipeline (drive, 0);
- idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTUNLOAD:
- case MTOFFL:
- idetape_discard_read_pipeline (drive, 0);
- idetape_create_load_unload_cmd (drive, &pc,!IDETAPE_LU_LOAD_MASK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTNOP:
- idetape_discard_read_pipeline (drive, 0);
- return (idetape_flush_tape_buffers (drive));
- case MTRETEN:
- idetape_discard_read_pipeline (drive, 0);
- idetape_create_load_unload_cmd (drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTEOM:
- if (tape->onstream) {
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr);
-#endif
- idetape_position_tape(drive, tape->eod_frame_addr, 0, 0);
- if (!idetape_get_logical_blk(drive, -1, 10, 0))
- return -EIO;
- if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_EOD)
- return -EIO;
- return 0;
- }
- idetape_create_space_cmd (&pc,0,IDETAPE_SPACE_TO_EOD);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTERASE:
- if (tape->onstream) {
- tape->eod_frame_addr = 20;
- tape->logical_blk_num = 0;
- tape->first_mark_addr = tape->last_mark_addr = -1;
- idetape_position_tape(drive, tape->eod_frame_addr, 0, 0);
- idetape_write_eod(drive);
- idetape_flush_tape_buffers (drive);
- idetape_write_header(drive, 0);
- idetape_flush_tape_buffers (drive);
- (void) idetape_rewind_tape (drive);
- return 0;
- }
- (void) idetape_rewind_tape (drive);
- idetape_create_erase_cmd (&pc);
- return (idetape_queue_pc_tail (drive,&pc));
- case MTSETBLK:
- if (tape->onstream) {
- if (mt_count != tape->tape_block_size) {
- printk(KERN_INFO "ide-tape: %s: MTSETBLK %d -- only %d bytes block size supported\n", tape->name, mt_count, tape->tape_block_size);
- return -EINVAL;
- }
- return 0;
- }
- if (mt_count) {
- if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
- return -EIO;
- tape->user_bs_factor = mt_count / tape->tape_block_size;
- clear_bit (IDETAPE_DETECT_BS, &tape->flags);
- } else
- set_bit (IDETAPE_DETECT_BS, &tape->flags);
- return 0;
- case MTSEEK:
- if (!tape->onstream || tape->raw) {
- idetape_discard_read_pipeline (drive, 0);
- return idetape_position_tape (drive, mt_count * tape->user_bs_factor, tape->partition, 0);
- }
- return idetape_seek_logical_blk(drive, mt_count);
- case MTSETPART:
- idetape_discard_read_pipeline (drive, 0);
- if (tape->onstream)
- return -EIO;
- return (idetape_position_tape (drive, 0, mt_count, 0));
- case MTFSR:
- case MTBSR:
- if (tape->onstream) {
- if (!idetape_get_logical_blk(drive, -1, 10, 0))
- return -EIO;
- if (mt_op == MTFSR)
- return idetape_seek_logical_blk(drive, tape->logical_blk_num + mt_count);
- else {
- idetape_discard_read_pipeline (drive, 0);
- return idetape_seek_logical_blk(drive, tape->logical_blk_num - mt_count);
- }
- }
- case MTLOCK:
- idetape_create_prevent_cmd(drive, &pc, 1);
- retval = idetape_queue_pc_tail (drive,&pc);
- if (retval) return retval;
- tape->door_locked = DOOR_EXPLICITLY_LOCKED;
- return 0;
- case MTUNLOCK:
- idetape_create_prevent_cmd(drive, &pc, 0);
- retval = idetape_queue_pc_tail (drive,&pc);
- if (retval) return retval;
- tape->door_locked = DOOR_UNLOCKED;
- return 0;
- default:
- printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
- return (-EIO);
- }
-}
-
-/*
- * Our character device ioctls.
- *
- * General mtio.h magnetic io commands are supported here, and not in
- * the corresponding block interface.
- *
- * The following ioctls are supported:
- *
- * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
- *
- * MTIOCGET - The mt_dsreg field in the returned mtget structure
- * will be set to (user block size in bytes <<
- * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
- *
- * The mt_blkno is set to the current user block number.
- * The other mtget fields are not supported.
- *
- * MTIOCPOS - The current tape "block position" is returned. We
- * assume that each block contains user_block_size
- * bytes.
- *
- * Our own ide-tape ioctls are supported on both interfaces.
- */
-static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
- ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
- idetape_tape_t *tape = drive->driver_data;
- struct mtop mtop;
- struct mtget mtget;
- struct mtpos mtpos;
- int block_offset = 0, position = tape->first_frame_position;
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 3)
- printk (KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, cmd=%u\n",cmd);
-#endif /* IDETAPE_DEBUG_LOG */
-
- tape->restart_speed_control_req = 1;
- if (tape->chrdev_direction == idetape_direction_write) {
- idetape_empty_write_pipeline (drive);
- idetape_flush_tape_buffers (drive);
- }
- if (cmd == MTIOCGET || cmd == MTIOCPOS) {
- block_offset = idetape_pipeline_size (drive) / (tape->tape_block_size * tape->user_bs_factor);
- if ((position = idetape_read_position(drive)) < 0)
- return -EIO;
- }
- switch (cmd) {
- case MTIOCTOP:
- if (copy_from_user ((char *) &mtop, (char *) arg, sizeof (struct mtop)))
- return -EFAULT;
- return (idetape_mtioctop (drive,mtop.mt_op,mtop.mt_count));
- case MTIOCGET:
- memset (&mtget, 0, sizeof (struct mtget));
- mtget.mt_type = MT_ISSCSI2;
- if (!tape->onstream || tape->raw)
- mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
- else {
- if (!idetape_get_logical_blk(drive, -1, 10, 0))
- mtget.mt_blkno = -1;
- else
- mtget.mt_blkno = tape->logical_blk_num;
- }
- mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
- if (tape->onstream) {
- mtget.mt_gstat |= GMT_ONLINE(0xffffffff);
- if (tape->first_stage && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD)
- mtget.mt_gstat |= GMT_EOD(0xffffffff);
- if (position <= 20)
- mtget.mt_gstat |= GMT_BOT(0xffffffff);
- }
- if (copy_to_user ((char *) arg,(char *) &mtget, sizeof (struct mtget)))
- return -EFAULT;
- return 0;
- case MTIOCPOS:
- if (tape->onstream && !tape->raw) {
- if (!idetape_get_logical_blk(drive, -1, 10, 0))
- return -EIO;
- mtpos.mt_blkno = tape->logical_blk_num;
- } else
- mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
- if (copy_to_user ((char *) arg,(char *) &mtpos, sizeof (struct mtpos)))
- return -EFAULT;
- return 0;
- default:
- if (tape->chrdev_direction == idetape_direction_read)
- idetape_discard_read_pipeline (drive, 1);
- return (idetape_blkdev_ioctl (drive,inode,file,cmd,arg));
- }
-}
-
-static int __idetape_analyze_headers (ide_drive_t *drive, int block)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_stage_t *stage;
- os_header_t *header;
- os_aux_t *aux;
-
- if (!tape->onstream || tape->raw) {
- tape->header_ok = tape->linux_media = 1;
- return 1;
- }
- tape->header_ok = tape->linux_media = 0;
- tape->update_frame_cntr = 0;
- tape->wrt_pass_cntr = 0;
- tape->eod_frame_addr = 20;
- tape->first_mark_addr = tape->last_mark_addr = -1;
- stage = __idetape_kmalloc_stage (tape, 0, 0);
- if (stage == NULL)
- return 0;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: reading header\n", tape->name);
-#endif
- idetape_position_tape(drive, block, 0, 0);
- if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bh)) {
- printk(KERN_INFO "ide-tape: %s: couldn't read header frame\n", tape->name);
- __idetape_kfree_stage (stage);
- return 0;
- }
- header = (os_header_t *) stage->bh->b_data;
- aux = stage->aux;
- if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0) {
- printk(KERN_INFO "ide-tape: %s: invalid header identification string\n", tape->name);
- __idetape_kfree_stage (stage);
- return 0;
- }
- if (header->major_rev != 1 || (header->minor_rev != 1 && header->minor_rev != 2))
- printk(KERN_INFO "ide-tape: warning: revision %d.%d detected (1.1/1.2 supported)\n", header->major_rev, header->minor_rev);
- if (header->par_num != 1)
- printk(KERN_INFO "ide-tape: warning: %d partitions defined, only one supported\n", header->par_num);
- tape->wrt_pass_cntr = ntohs(header->partition.wrt_pass_cntr);
- tape->eod_frame_addr = ntohl(header->partition.eod_frame_addr);
- tape->filemark_cnt = ntohl(aux->filemark_cnt);
- tape->first_mark_addr = ntohl(aux->next_mark_addr);
- tape->last_mark_addr = ntohl(aux->last_mark_addr);
- tape->update_frame_cntr = ntohl(aux->update_frame_cntr);
- memcpy(tape->application_sig, aux->application_sig, 4); tape->application_sig[4] = 0;
- if (memcmp(tape->application_sig, "LIN", 3) == 0) {
- tape->linux_media = 1;
- tape->linux_media_version = tape->application_sig[3] - '0';
- if (tape->linux_media_version != 3)
- printk(KERN_INFO "ide-tape: %s: Linux media version %d detected (current 3)\n", tape->name, tape->linux_media_version);
- } else {
- printk(KERN_INFO "ide-tape: %s: non Linux media detected (%s)\n", tape->name, tape->application_sig);
- tape->linux_media = 0;
- }
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 2)
- printk(KERN_INFO "ide-tape: %s: detected write pass counter %d, eod frame addr %d\n", tape->name, tape->wrt_pass_cntr, tape->eod_frame_addr);
-#endif
- __idetape_kfree_stage (stage);
- return 1;
-}
-
-static int idetape_analyze_headers (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int position, block;
-
- if (!tape->onstream || tape->raw) {
- tape->header_ok = tape->linux_media = 1;
- return 1;
- }
- tape->header_ok = tape->linux_media = 0;
- position = idetape_read_position(drive);
- for (block = 5; block < 10; block++)
- if (__idetape_analyze_headers(drive, block))
- goto ok;
-#if 0
- for (block = 0xbae; block < 0xbb8; block++)
-#else
- for (block = 0xbae; block < 0xbb3; block++)
-#endif
- if (__idetape_analyze_headers(drive, block))
- goto ok;
- printk(KERN_ERR "ide-tape: %s: failed to find valid ADRL header\n", tape->name);
- return 0;
-ok:
- if (position < 20)
- position = 20;
- idetape_position_tape(drive, position, 0, 0);
- tape->header_ok = 1;
- return 1;
-}
-
-/*
- * Our character device open function.
- */
-static int idetape_chrdev_open (struct inode *inode, struct file *filp)
-{
- ide_drive_t *drive;
- idetape_tape_t *tape;
- idetape_pc_t pc;
- unsigned int minor=MINOR (inode->i_rdev);
-
-#if IDETAPE_DEBUG_LOG
- printk (KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if ((drive = get_drive_ptr (inode->i_rdev)) == NULL)
- return -ENXIO;
- tape = drive->driver_data;
-
- if (test_and_set_bit (IDETAPE_BUSY, &tape->flags))
- return -EBUSY;
- MOD_INC_USE_COUNT;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 6)
- printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_chrdev_open-1\n");
-#endif
- if (!tape->onstream) {
- idetape_read_position(drive);
- if (!test_bit (IDETAPE_ADDRESS_VALID, &tape->flags))
- (void) idetape_rewind_tape (drive);
- } else {
- if (minor & 64) {
- tape->tape_block_size = tape->stage_size = 32768 + 512;
- tape->raw = 1;
- } else {
- tape->tape_block_size = tape->stage_size = 32768;
- tape->raw = 0;
- }
- }
- if (idetape_wait_ready(drive, 60 * HZ)) {
- clear_bit(IDETAPE_BUSY, &tape->flags);
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 6)
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_chrdev_open-1\n");
-#endif
- printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
- return -EBUSY;
- }
- idetape_read_position(drive);
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 6)
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_chrdev_open-2\n");
-#endif
- clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags);
-
- if (tape->chrdev_direction == idetape_direction_none) {
- MOD_INC_USE_COUNT;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 6)
- printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_chrdev_open-2\n");
-#endif
- idetape_create_prevent_cmd(drive, &pc, 1);
- if (!idetape_queue_pc_tail (drive,&pc)) {
- if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
- tape->door_locked = DOOR_LOCKED;
- }
- idetape_analyze_headers(drive);
- }
- tape->max_frames = tape->cur_frames = tape->req_buffer_fill = 0;
- idetape_restart_speed_control(drive);
- tape->restart_speed_control_req = 0;
- return 0;
-}
-
-/*
- * Our character device release function.
- */
-static int idetape_chrdev_release (struct inode *inode, struct file *filp)
-{
- ide_drive_t *drive = get_drive_ptr (inode->i_rdev);
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
- unsigned int minor=MINOR (inode->i_rdev);
-
-#if IDETAPE_DEBUG_LOG
- if (tape->debug_level >= 3)
- printk (KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
-#endif /* IDETAPE_DEBUG_LOG */
-
- if (tape->chrdev_direction == idetape_direction_write) {
- idetape_empty_write_pipeline (drive);
- tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0);
- if (tape->merge_stage != NULL) {
- idetape_pad_zeros (drive, tape->tape_block_size * (tape->user_bs_factor - 1));
- __idetape_kfree_stage (tape->merge_stage);
- tape->merge_stage = NULL;
- }
- idetape_write_filemark(drive);
- idetape_write_eod(drive);
- idetape_flush_tape_buffers (drive);
- idetape_write_header(drive, minor >= 128);
- idetape_flush_tape_buffers (drive);
- }
- if (tape->chrdev_direction == idetape_direction_read) {
- if (minor < 128)
- idetape_discard_read_pipeline (drive, 1);
- else
- idetape_wait_for_pipeline (drive);
- }
- if (tape->cache_stage != NULL) {
- __idetape_kfree_stage (tape->cache_stage);
- tape->cache_stage = NULL;
- }
- if (minor < 128)
- (void) idetape_rewind_tape (drive);
- if (tape->chrdev_direction == idetape_direction_none) {
- if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) {
- idetape_create_prevent_cmd(drive, &pc, 0);
- if (!idetape_queue_pc_tail (drive,&pc))
- tape->door_locked = DOOR_UNLOCKED;
- }
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- if (tape->debug_level >= 6)
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_chrdev_release\n");
-#endif
- }
- clear_bit (IDETAPE_BUSY, &tape->flags);
- return 0;
-}
-
-/*
- * idetape_identify_device is called to check the contents of the
- * ATAPI IDENTIFY command results. We return:
- *
- * 1 If the tape can be supported by us, based on the information
- * we have so far.
- *
- * 0 If this tape driver is not currently supported by us.
- */
-static int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id)
-{
- struct idetape_id_gcw gcw;
-#if IDETAPE_DEBUG_INFO
- unsigned short mask,i;
-#endif /* IDETAPE_DEBUG_INFO */
-
- if (!id)
- return 0;
-
- *((unsigned short *) &gcw) = id->config;
-
-#if IDETAPE_DEBUG_INFO
- printk (KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n");
- printk (KERN_INFO "ide-tape: Protocol Type: ");
- switch (gcw.protocol) {
- case 0: case 1: printk (KERN_INFO "ATA\n");break;
- case 2: printk (KERN_INFO "ATAPI\n");break;
- case 3: printk (KERN_INFO "Reserved (Unknown to ide-tape)\n");break;
- }
- printk (KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type);
- switch (gcw.device_type) {
- case 0: printk (KERN_INFO "Direct-access Device\n");break;
- case 1: printk (KERN_INFO "Streaming Tape Device\n");break;
- case 2: case 3: case 4: printk (KERN_INFO "Reserved\n");break;
- case 5: printk (KERN_INFO "CD-ROM Device\n");break;
- case 6: printk (KERN_INFO "Reserved\n");
- case 7: printk (KERN_INFO "Optical memory Device\n");break;
- case 0x1f: printk (KERN_INFO "Unknown or no Device type\n");break;
- default: printk (KERN_INFO "Reserved\n");
- }
- printk (KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n");
- printk (KERN_INFO "ide-tape: Command Packet DRQ Type: ");
- switch (gcw.drq_type) {
- case 0: printk (KERN_INFO "Microprocessor DRQ\n");break;
- case 1: printk (KERN_INFO "Interrupt DRQ\n");break;
- case 2: printk (KERN_INFO "Accelerated DRQ\n");break;
- case 3: printk (KERN_INFO "Reserved\n");break;
- }
- printk (KERN_INFO "ide-tape: Command Packet Size: ");
- switch (gcw.packet_size) {
- case 0: printk (KERN_INFO "12 bytes\n");break;
- case 1: printk (KERN_INFO "16 bytes\n");break;
- default: printk (KERN_INFO "Reserved\n");break;
- }
- printk (KERN_INFO "ide-tape: Model: %.40s\n",id->model);
- printk (KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev);
- printk (KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no);
- printk (KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512);
- printk (KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
- printk (KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
- printk (KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
- printk (KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
- printk (KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
- printk (KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO);
- printk (KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA);
- printk (KERN_INFO "ide-tape: Single Word DMA supported modes: ");
- for (i=0,mask=1;i<8;i++,mask=mask << 1) {
- if (id->dma_1word & mask)
- printk (KERN_INFO "%d ",i);
- if (id->dma_1word & (mask << 8))
- printk (KERN_INFO "(active) ");
- }
- printk (KERN_INFO "\n");
- printk (KERN_INFO "ide-tape: Multi Word DMA supported modes: ");
- for (i=0,mask=1;i<8;i++,mask=mask << 1) {
- if (id->dma_mword & mask)
- printk (KERN_INFO "%d ",i);
- if (id->dma_mword & (mask << 8))
- printk (KERN_INFO "(active) ");
- }
- printk (KERN_INFO "\n");
- if (id->field_valid & 0x0002) {
- printk (KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None");
- printk (KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: ");
- if (id->eide_dma_min == 0)
- printk (KERN_INFO "Not supported\n");
- else
- printk (KERN_INFO "%d ns\n",id->eide_dma_min);
-
- printk (KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: ");
- if (id->eide_dma_time == 0)
- printk (KERN_INFO "Not supported\n");
- else
- printk (KERN_INFO "%d ns\n",id->eide_dma_time);
-
- printk (KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: ");
- if (id->eide_pio == 0)
- printk (KERN_INFO "Not supported\n");
- else
- printk (KERN_INFO "%d ns\n",id->eide_pio);
-
- printk (KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: ");
- if (id->eide_pio_iordy == 0)
- printk (KERN_INFO "Not supported\n");
- else
- printk (KERN_INFO "%d ns\n",id->eide_pio_iordy);
-
- } else
- printk (KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n");
-#endif /* IDETAPE_DEBUG_INFO */
-
- /* Check that we can support this device */
-
- if (gcw.protocol !=2 )
- printk (KERN_ERR "ide-tape: Protocol is not ATAPI\n");
- else if (gcw.device_type != 1)
- printk (KERN_ERR "ide-tape: Device type is not set to tape\n");
- else if (!gcw.removable)
- printk (KERN_ERR "ide-tape: The removable flag is not set\n");
- else if (gcw.packet_size != 0) {
- printk (KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
- if (gcw.packet_size == 1)
- printk (KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
- } else
- return 1;
- return 0;
-}
-
-/*
- * Notify vendor ID to the OnStream tape drive
- */
-static void idetape_onstream_set_vendor (ide_drive_t *drive, char *vendor)
-{
- idetape_pc_t pc;
- idetape_mode_parameter_header_t *header;
-
- idetape_create_mode_select_cmd(&pc, sizeof(*header) + 8);
- pc.buffer[0] = 3 + 8; /* Mode Data Length */
- pc.buffer[1] = 0; /* Medium Type - ignoring */
- pc.buffer[2] = 0; /* Reserved */
- pc.buffer[3] = 0; /* Block Descriptor Length */
- pc.buffer[4 + 0] = 0x36 | (1 << 7);
- pc.buffer[4 + 1] = 6;
- pc.buffer[4 + 2] = vendor[0];
- pc.buffer[4 + 3] = vendor[1];
- pc.buffer[4 + 4] = vendor[2];
- pc.buffer[4 + 5] = vendor[3];
- pc.buffer[4 + 6] = 0;
- pc.buffer[4 + 7] = 0;
- if (idetape_queue_pc_tail (drive,&pc))
- printk (KERN_ERR "ide-tape: Couldn't set vendor name to %s\n", vendor);
-
-}
-
-/*
- * Various unused OnStream commands
- */
-#if ONSTREAM_DEBUG
-static void idetape_onstream_set_retries (ide_drive_t *drive, int retries)
-{
- idetape_pc_t pc;
-
- idetape_create_mode_select_cmd(&pc, sizeof(idetape_mode_parameter_header_t) + 4);
- pc.buffer[0] = 3 + 4;
- pc.buffer[1] = 0; /* Medium Type - ignoring */
- pc.buffer[2] = 0; /* Reserved */
- pc.buffer[3] = 0; /* Block Descriptor Length */
- pc.buffer[4 + 0] = 0x2f | (1 << 7);
- pc.buffer[4 + 1] = 2;
- pc.buffer[4 + 2] = 4;
- pc.buffer[4 + 3] = retries;
- if (idetape_queue_pc_tail (drive,&pc))
- printk (KERN_ERR "ide-tape: Couldn't set retries to %d\n", retries);
-}
-#endif
-
-/*
- * Configure 32.5KB block size.
- */
-static void idetape_onstream_configure_block_size (ide_drive_t *drive)
-{
- idetape_pc_t pc;
- idetape_mode_parameter_header_t *header;
- idetape_block_size_page_t *bs;
-
- /*
- * Get the current block size from the block size mode page
- */
- idetape_create_mode_sense_cmd (&pc,IDETAPE_BLOCK_SIZE_PAGE);
- if (idetape_queue_pc_tail (drive,&pc))
- printk (KERN_ERR "ide-tape: can't get tape block size mode page\n");
- header = (idetape_mode_parameter_header_t *) pc.buffer;
- bs = (idetape_block_size_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
-
-#if IDETAPE_DEBUG_INFO
- printk(KERN_INFO "ide-tape: 32KB play back: %s\n", bs->play32 ? "Yes" : "No");
- printk(KERN_INFO "ide-tape: 32.5KB play back: %s\n", bs->play32_5 ? "Yes" : "No");
- printk(KERN_INFO "ide-tape: 32KB record: %s\n", bs->record32 ? "Yes" : "No");
- printk(KERN_INFO "ide-tape: 32.5KB record: %s\n", bs->record32_5 ? "Yes" : "No");
-#endif /* IDETAPE_DEBUG_INFO */
-
- /*
- * Configure default auto columns mode, 32.5KB block size
- */
- bs->one = 1;
- bs->play32 = 0;
- bs->play32_5 = 1;
- bs->record32 = 0;
- bs->record32_5 = 1;
- idetape_create_mode_select_cmd(&pc, sizeof(*header) + sizeof(*bs));
- if (idetape_queue_pc_tail (drive,&pc))
- printk (KERN_ERR "ide-tape: Couldn't set tape block size mode page\n");
-
-#if ONSTREAM_DEBUG
- /*
- * In debug mode, we want to see as many errors as possible
- * to test the error recovery mechanism.
- */
- idetape_onstream_set_retries(drive, 0);
-#endif
-}
-
-/*
- * Use INQUIRY to get the firmware revision
- */
-static void idetape_get_inquiry_results (ide_drive_t *drive)
-{
- char *r;
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
- idetape_inquiry_result_t *inquiry;
-
- idetape_create_inquiry_cmd(&pc);
- if (idetape_queue_pc_tail (drive,&pc)) {
- printk (KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
- return;
- }
- inquiry = (idetape_inquiry_result_t *) pc.buffer;
- memcpy(tape->vendor_id, inquiry->vendor_id, 8);
- memcpy(tape->product_id, inquiry->product_id, 16);
- memcpy(tape->firmware_revision, inquiry->revision_level, 4);
- ide_fixstring(tape->vendor_id, 10, 0);
- ide_fixstring(tape->product_id, 18, 0);
- ide_fixstring(tape->firmware_revision, 6, 0);
- r = tape->firmware_revision;
- if (*(r + 1) == '.')
- tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
- else if (tape->onstream)
- tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 1) - '0') * 10 + *(r + 2) - '0';
- printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision);
-}
-
-/*
- * Configure the OnStream ATAPI tape drive for default operation
- */
-static void idetape_configure_onstream (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
- if (tape->firmware_revision_num < 105) {
- printk(KERN_INFO "ide-tape: %s: Old OnStream firmware revision detected (%s)\n", tape->name, tape->firmware_revision);
- printk(KERN_INFO "ide-tape: %s: An upgrade to version 1.05 or above is recommended\n", tape->name);
- }
-
- /*
- * Configure 32.5KB (data+aux) block size.
- */
- idetape_onstream_configure_block_size(drive);
-
- /*
- * Set vendor name to 'LIN3' for "Linux support version 3".
- */
- idetape_onstream_set_vendor(drive, "LIN3");
-}
-
-/*
- * idetape_get_mode_sense_results asks the tape about its various
- * parameters. In particular, we will adjust our data transfer buffer
- * size to the recommended value as returned by the tape.
- */
-static void idetape_get_mode_sense_results (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- idetape_pc_t pc;
- idetape_mode_parameter_header_t *header;
- idetape_capabilities_page_t *capabilities;
-
- idetape_create_mode_sense_cmd (&pc,IDETAPE_CAPABILITIES_PAGE);
- if (idetape_queue_pc_tail (drive,&pc)) {
- printk (KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
- tape->tape_block_size = 512; tape->capabilities.ctl = 52;
- tape->capabilities.speed = 450; tape->capabilities.buffer_size = 6 * 52;
- return;
- }
- header = (idetape_mode_parameter_header_t *) pc.buffer;
- capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
-
- capabilities->max_speed = ntohs (capabilities->max_speed);
- capabilities->ctl = ntohs (capabilities->ctl);
- capabilities->speed = ntohs (capabilities->speed);
- capabilities->buffer_size = ntohs (capabilities->buffer_size);
-
- if (!capabilities->speed) {
- printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
- capabilities->speed = 650;
- }
- if (!capabilities->max_speed) {
- printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
- capabilities->max_speed = 650;
- }
-
- tape->capabilities = *capabilities; /* Save us a copy */
- if (capabilities->blk512)
- tape->tape_block_size = 512;
- else if (capabilities->blk1024)
- tape->tape_block_size = 1024;
- else if (tape->onstream && capabilities->blk32768)
- tape->tape_block_size = 32768;
-
-#if IDETAPE_DEBUG_INFO
- printk (KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n");
- printk (KERN_INFO "ide-tape: Mode Parameter Header:\n");
- printk (KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length);
- printk (KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type);
- printk (KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp);
- printk (KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl);
-
- printk (KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n");
- printk (KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code);
- printk (KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length);
- printk (KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
- printk (KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
- printk (KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No");
- printk (KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed);
- printk (KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl);
- printk (KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed);
- printk (KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512);
-#endif /* IDETAPE_DEBUG_INFO */
-}
-
-static void idetape_add_settings (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
-
-/*
- * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
- */
- ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
- ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
- ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
- ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
- ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
- ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
- ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL);
- ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
- ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
- ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
- ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
- ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL);
- ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
- if (tape->onstream) {
- ide_add_setting(drive, "cur_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->cur_frames, NULL);
- ide_add_setting(drive, "max_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->max_frames, NULL);
- ide_add_setting(drive, "insert_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_speed, NULL);
- ide_add_setting(drive, "speed_control",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->speed_control, NULL);
- ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
- ide_add_setting(drive, "tape_still_time",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->tape_still_time, NULL);
- ide_add_setting(drive, "max_insert_speed",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->max_insert_speed, NULL);
- ide_add_setting(drive, "insert_size", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_size, NULL);
- }
-}
-
-/*
- * ide_setup is called to:
- *
- * 1. Initialize our various state variables.
- * 2. Ask the tape for its capabilities.
- * 3. Allocate a buffer which will be used for data
- * transfer. The buffer size is chosen based on
- * the recommendation which we received in step (2).
- *
- * Note that at this point ide.c already assigned us an irq, so that
- * we can queue requests here and wait for their completion.
- */
-static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
-{
- unsigned long t1, tmid, tn, t;
- int speed;
- struct idetape_id_gcw gcw;
- int stage_size;
-
- memset (tape, 0, sizeof (idetape_tape_t));
- spin_lock_init(&tape->spinlock);
- drive->driver_data = tape;
- drive->ready_stat = 0; /* An ATAPI device ignores DRDY */
- if (strstr(drive->id->model, "OnStream DI-30"))
- tape->onstream = 1;
- drive->dsc_overlap = 1;
-#ifdef CONFIG_BLK_DEV_IDEPCI
- if (!tape->onstream && HWIF(drive)->pci_dev != NULL) {
- /*
- * These two ide-pci host adapters appear to need DSC overlap disabled.
- * This probably needs further analysis.
- */
- if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) ||
- (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) {
- printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name);
- drive->dsc_overlap = 0;
- }
- }
-#endif /* CONFIG_BLK_DEV_IDEPCI */
- tape->drive = drive;
- tape->minor = minor;
- tape->name[0] = 'h'; tape->name[1] = 't'; tape->name[2] = '0' + minor;
- tape->chrdev_direction = idetape_direction_none;
- tape->pc = tape->pc_stack;
- tape->max_insert_speed = 10000;
- tape->speed_control = 1;
- *((unsigned short *) &gcw) = drive->id->config;
- if (gcw.drq_type == 1)
- set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
-
- tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
-
- idetape_get_inquiry_results(drive);
- idetape_get_mode_sense_results(drive);
- if (tape->onstream)
- idetape_configure_onstream(drive);
-
- tape->user_bs_factor = 1;
- tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
- while (tape->stage_size > 0xffff) {
- printk (KERN_NOTICE "ide-tape: decreasing stage size\n");
- tape->capabilities.ctl /= 2;
- tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
- }
- stage_size = tape->stage_size;
- if (tape->onstream)
- stage_size = 32768 + 512;
- tape->pages_per_stage = stage_size / PAGE_SIZE;
- if (stage_size % PAGE_SIZE) {
- tape->pages_per_stage++;
- tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
- }
-
- /*
- * Select the "best" DSC read/write polling frequency
- * and pipeline size.
- */
- speed = IDE_MAX (tape->capabilities.speed, tape->capabilities.max_speed);
-
- tape->max_stages = speed * 1000 * 10 / tape->stage_size;
- tape->min_pipeline = tape->max_stages;
- tape->max_pipeline = tape->max_stages * 2;
-
- t1 = (tape->stage_size * HZ) / (speed * 1000);
- tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
- tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
-
- if (tape->max_stages)
- t = tn;
- else
- t = t1;
-
- /*
- * Ensure that the number we got makes sense; limit
- * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
- */
- tape->best_dsc_rw_frequency = IDE_MAX (IDE_MIN (t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
- printk (KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, %dkB pipeline, %lums tDSC%s\n",
- drive->name, tape->name, tape->capabilities.speed, (tape->capabilities.buffer_size * 512) / tape->stage_size,
- tape->stage_size / 1024, tape->max_stages * tape->stage_size / 1024,
- tape->best_dsc_rw_frequency * 1000 / HZ, drive->using_dma ? ", DMA":"");
-
- idetape_add_settings(drive);
-}
-
-static int idetape_cleanup (ide_drive_t *drive)
-{
- idetape_tape_t *tape = drive->driver_data;
- int minor = tape->minor;
- unsigned long flags;
-
- save_flags (flags); /* all CPUs (overkill?) */
- cli(); /* all CPUs (overkill?) */
- if (test_bit (IDETAPE_BUSY, &tape->flags) || tape->first_stage != NULL || tape->merge_stage_size || drive->usage) {
- restore_flags(flags); /* all CPUs (overkill?) */
- return 1;
- }
- idetape_chrdevs[minor].drive = NULL;
- restore_flags (flags); /* all CPUs (overkill?) */
- DRIVER(drive)->busy = 0;
- (void) ide_unregister_subdriver (drive);
- drive->driver_data = NULL;
- devfs_unregister (tape->de_r);
- devfs_unregister (tape->de_n);
- kfree (tape);
- for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++)
- if (idetape_chrdevs[minor].drive != NULL)
- return 0;
- devfs_unregister_chrdev (IDETAPE_MAJOR, "ht");
- idetape_chrdev_present = 0;
- return 0;
-}
-
-#ifdef CONFIG_PROC_FS
-
-static int proc_idetape_read_name
- (char *page, char **start, off_t off, int count, int *eof, void *data)
-{
- ide_drive_t *drive = (ide_drive_t *) data;
- idetape_tape_t *tape = drive->driver_data;
- char *out = page;
- int len;
-
- len = sprintf(out,"%s\n", tape->name);
- PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
-}
-
-static ide_proc_entry_t idetape_proc[] = {
- { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
- { NULL, 0, NULL, NULL }
-};
-
-#else
-
-#define idetape_proc NULL
-
-#endif
-
-/*
- * IDE subdriver functions, registered with ide.c
- */
-static ide_driver_t idetape_driver = {
- "ide-tape", /* name */
- IDETAPE_VERSION, /* version */
- ide_tape, /* media */
- 1, /* busy */
- 1, /* supports_dma */
- 1, /* supports_dsc_overlap */
- idetape_cleanup, /* cleanup */
- idetape_do_request, /* do_request */
- idetape_end_request, /* end_request */
- idetape_blkdev_ioctl, /* ioctl */
- idetape_blkdev_open, /* open */
- idetape_blkdev_release, /* release */
- NULL, /* media_change */
- idetape_pre_reset, /* pre_reset */
- NULL, /* capacity */
- NULL, /* special */
- idetape_proc /* proc */
-};
-
-int idetape_init (void);
-static ide_module_t idetape_module = {
- IDE_DRIVER_MODULE,
- idetape_init,
- &idetape_driver,
- NULL
-};
-
-/*
- * Our character device supporting functions, passed to register_chrdev.
- */
-static struct file_operations idetape_fops = {
- read: idetape_chrdev_read,
- write: idetape_chrdev_write,
- ioctl: idetape_chrdev_ioctl,
- open: idetape_chrdev_open,
- release: idetape_chrdev_release,
-};
-
-/*
- * idetape_init will register the driver for each tape.
- */
-int idetape_init (void)
-{
- ide_drive_t *drive;
- idetape_tape_t *tape;
- int minor, failed = 0, supported = 0;
-
- MOD_INC_USE_COUNT;
-#if ONSTREAM_DEBUG
- printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_init\n");
-#endif
- if (!idetape_chrdev_present)
- for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++ )
- idetape_chrdevs[minor].drive = NULL;
-
- if ((drive = ide_scan_devices (ide_tape, idetape_driver.name, NULL, failed++)) == NULL) {
- ide_register_module (&idetape_module);
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n");
-#endif
- return 0;
- }
- if (!idetape_chrdev_present &&
- devfs_register_chrdev (IDETAPE_MAJOR, "ht", &idetape_fops)) {
- printk (KERN_ERR "ide-tape: Failed to register character device interface\n");
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n");
-#endif
- return -EBUSY;
- }
- do {
- if (!idetape_identify_device (drive, drive->id)) {
- printk (KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
- continue;
- }
- if (drive->scsi) {
- if (strstr(drive->id->model, "OnStream DI-30")) {
- printk("ide-tape: ide-scsi emulation is not supported for %s.\n", drive->id->model);
- } else {
- printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
- continue;
- }
- }
- tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL);
- if (tape == NULL) {
- printk (KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
- continue;
- }
- if (ide_register_subdriver (drive, &idetape_driver, IDE_SUBDRIVER_VERSION)) {
- printk (KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name);
- kfree (tape);
- continue;
- }
- for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++);
- idetape_setup (drive, tape, minor);
- idetape_chrdevs[minor].drive = drive;
- tape->de_r =
- devfs_register (drive->de, "mt", 2, DEVFS_FL_DEFAULT,
- HWIF(drive)->major, minor,
- S_IFCHR | S_IRUGO | S_IWUGO, 0, 0,
- &idetape_fops, NULL);
- tape->de_n =
- devfs_register (drive->de, "mtn", 3, DEVFS_FL_DEFAULT,
- HWIF(drive)->major, minor + 128,
- S_IFCHR | S_IRUGO | S_IWUGO, 0, 0,
- &idetape_fops, NULL);
- devfs_register_tape (tape->de_r);
- supported++; failed--;
- } while ((drive = ide_scan_devices (ide_tape, idetape_driver.name, NULL, failed++)) != NULL);
- if (!idetape_chrdev_present && !supported) {
- devfs_unregister_chrdev (IDETAPE_MAJOR, "ht");
- } else
- idetape_chrdev_present = 1;
- ide_register_module (&idetape_module);
- MOD_DEC_USE_COUNT;
-#if ONSTREAM_DEBUG
- printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n");
-#endif
- return 0;
-}
-
-#ifdef MODULE
-int init_module (void)
-{
- return idetape_init ();
-}
-
-void cleanup_module (void)
-{
- ide_drive_t *drive;
- int minor;
-
- for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) {
- drive = idetape_chrdevs[minor].drive;
- if (drive != NULL && idetape_cleanup (drive))
- printk (KERN_ERR "ide-tape: %s: cleanup_module() called while still busy\n", drive->name);
- }
- ide_unregister_module(&idetape_module);
-}
-#endif /* MODULE */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)