patch-2.4.1 linux/fs/reiserfs/journal.c
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- Lines: 3216
- Date:
Mon Jan 15 15:31:19 2001
- Orig file:
v2.4.0/linux/fs/reiserfs/journal.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.0/linux/fs/reiserfs/journal.c linux/fs/reiserfs/journal.c
@@ -0,0 +1,3215 @@
+/*
+** Write ahead logging implementation copyright Chris Mason 2000
+**
+** The background commits make this code very interelated, and
+** overly complex. I need to rethink things a bit....The major players:
+**
+** journal_begin -- call with the number of blocks you expect to log.
+** If the current transaction is too
+** old, it will block until the current transaction is
+** finished, and then start a new one.
+** Usually, your transaction will get joined in with
+** previous ones for speed.
+**
+** journal_join -- same as journal_begin, but won't block on the current
+** transaction regardless of age. Don't ever call
+** this. Ever. There are only two places it should be
+** called from, and they are both inside this file.
+**
+** journal_mark_dirty -- adds blocks into this transaction. clears any flags
+** that might make them get sent to disk
+** and then marks them BH_JDirty. Puts the buffer head
+** into the current transaction hash.
+**
+** journal_end -- if the current transaction is batchable, it does nothing
+** otherwise, it could do an async/synchronous commit, or
+** a full flush of all log and real blocks in the
+** transaction.
+**
+** flush_old_commits -- if the current transaction is too old, it is ended and
+** commit blocks are sent to disk. Forces commit blocks
+** to disk for all backgrounded commits that have been
+** around too long.
+** -- Note, if you call this as an immediate flush from
+** from within kupdate, it will ignore the immediate flag
+**
+** The commit thread -- a writer process for async commits. It allows a
+** a process to request a log flush on a task queue.
+** the commit will happen once the commit thread wakes up.
+** The benefit here is the writer (with whatever
+** related locks it has) doesn't have to wait for the
+** log blocks to hit disk if it doesn't want to.
+*/
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/sched.h>
+#include <asm/semaphore.h>
+
+#include <linux/vmalloc.h>
+#include <linux/reiserfs_fs.h>
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/locks.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+
+#else
+
+#include "nokernel.h"
+
+#endif
+
+
+/* the number of mounted filesystems. This is used to decide when to
+** start and kill the commit thread
+*/
+static int reiserfs_mounted_fs_count = 0 ;
+
+/* wake this up when you add something to the commit thread task queue */
+DECLARE_WAIT_QUEUE_HEAD(reiserfs_commit_thread_wait) ;
+
+/* wait on this if you need to be sure you task queue entries have been run */
+static DECLARE_WAIT_QUEUE_HEAD(reiserfs_commit_thread_done) ;
+DECLARE_TASK_QUEUE(reiserfs_commit_thread_tq) ;
+
+#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit structs at 4k */
+
+/* cnode stat bits. Move these into reiserfs_fs.h */
+
+#define BLOCK_FREED 2 /* this block was freed, and can't be written. */
+#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
+
+#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
+
+/* flags for do_journal_end */
+#define FLUSH_ALL 1 /* flush commit and real blocks */
+#define COMMIT_NOW 2 /* end and commit this transaction */
+#define WAIT 4 /* wait for the log blocks to hit the disk*/
+
+/* state bits for the journal */
+#define WRITERS_BLOCKED 1 /* set when new writers not allowed */
+
+static int do_journal_end(struct reiserfs_transaction_handle *,struct super_block *,unsigned long nblocks,int flags) ;
+static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
+static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
+static int can_dirty(struct reiserfs_journal_cnode *cn) ;
+
+static void init_journal_hash(struct super_block *p_s_sb) {
+ memset(SB_JOURNAL(p_s_sb)->j_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ;
+}
+
+/*
+** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
+** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
+** more details.
+*/
+static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) {
+ if (bh) {
+ clear_bit(BH_Dirty, &bh->b_state) ;
+#if 0
+ if (bh->b_list != BUF_CLEAN) {
+ reiserfs_file_buffer(bh, BUF_CLEAN) ;
+ }
+#endif
+ }
+ return 0 ;
+}
+
+static struct reiserfs_bitmap_node *
+allocate_bitmap_node(struct super_block *p_s_sb) {
+ struct reiserfs_bitmap_node *bn ;
+ static int id = 0 ;
+
+ bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_BUFFER) ;
+ if (!bn) {
+ return NULL ;
+ }
+ bn->data = kmalloc(p_s_sb->s_blocksize, GFP_BUFFER) ;
+ if (!bn->data) {
+ kfree(bn) ;
+ return NULL ;
+ }
+ bn->id = id++ ;
+ memset(bn->data, 0, p_s_sb->s_blocksize) ;
+ INIT_LIST_HEAD(&bn->list) ;
+ return bn ;
+}
+
+static struct reiserfs_bitmap_node *
+get_bitmap_node(struct super_block *p_s_sb) {
+ struct reiserfs_bitmap_node *bn = NULL;
+ struct list_head *entry = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ;
+
+ SB_JOURNAL(p_s_sb)->j_used_bitmap_nodes++ ;
+repeat:
+
+ if(entry != &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) {
+ bn = list_entry(entry, struct reiserfs_bitmap_node, list) ;
+ list_del(entry) ;
+ memset(bn->data, 0, p_s_sb->s_blocksize) ;
+ SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes-- ;
+ return bn ;
+ }
+ bn = allocate_bitmap_node(p_s_sb) ;
+ if (!bn) {
+ current->policy = SCHED_YIELD ;
+ schedule() ;
+ goto repeat ;
+ }
+ return bn ;
+}
+static inline void free_bitmap_node(struct super_block *p_s_sb,
+ struct reiserfs_bitmap_node *bn) {
+ SB_JOURNAL(p_s_sb)->j_used_bitmap_nodes-- ;
+ if (SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
+ kfree(bn->data) ;
+ kfree(bn) ;
+ } else {
+ list_add(&bn->list, &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ;
+ SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes++ ;
+ }
+}
+
+static void allocate_bitmap_nodes(struct super_block *p_s_sb) {
+ int i ;
+ struct reiserfs_bitmap_node *bn = NULL ;
+ for (i = 0 ; i < REISERFS_MIN_BITMAP_NODES ; i++) {
+ bn = allocate_bitmap_node(p_s_sb) ;
+ if (bn) {
+ list_add(&bn->list, &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ;
+ SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes++ ;
+ } else {
+ break ; // this is ok, we'll try again when more are needed
+ }
+ }
+}
+
+static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
+ struct reiserfs_list_bitmap *jb) {
+ int bmap_nr = block / (p_s_sb->s_blocksize << 3) ;
+ int bit_nr = block % (p_s_sb->s_blocksize << 3) ;
+
+ if (!jb->bitmaps[bmap_nr]) {
+ jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb) ;
+ }
+ set_bit(bit_nr, jb->bitmaps[bmap_nr]->data) ;
+ return 0 ;
+}
+
+static void cleanup_bitmap_list(struct super_block *p_s_sb,
+ struct reiserfs_list_bitmap *jb) {
+ int i;
+ for (i = 0 ; i < SB_BMAP_NR(p_s_sb) ; i++) {
+ if (jb->bitmaps[i]) {
+ free_bitmap_node(p_s_sb, jb->bitmaps[i]) ;
+ jb->bitmaps[i] = NULL ;
+ }
+ }
+}
+
+/*
+** only call this on FS unmount.
+*/
+static int free_list_bitmaps(struct super_block *p_s_sb,
+ struct reiserfs_list_bitmap *jb_array) {
+ int i ;
+ struct reiserfs_list_bitmap *jb ;
+ for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
+ jb = jb_array + i ;
+ jb->journal_list = NULL ;
+ cleanup_bitmap_list(p_s_sb, jb) ;
+ vfree(jb->bitmaps) ;
+ jb->bitmaps = NULL ;
+ }
+ return 0;
+}
+
+static int free_bitmap_nodes(struct super_block *p_s_sb) {
+ struct list_head *next = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ;
+ struct reiserfs_bitmap_node *bn ;
+
+ while(next != &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) {
+ bn = list_entry(next, struct reiserfs_bitmap_node, list) ;
+ list_del(next) ;
+ kfree(bn->data) ;
+ kfree(bn) ;
+ next = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ;
+ SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes-- ;
+ }
+
+ return 0 ;
+}
+
+/*
+** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
+** jb_array is the array to be filled in.
+*/
+int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
+ struct reiserfs_list_bitmap *jb_array,
+ int bmap_nr) {
+ int i ;
+ int failed = 0 ;
+ struct reiserfs_list_bitmap *jb ;
+ int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *) ;
+
+ for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
+ jb = jb_array + i ;
+ jb->journal_list = NULL ;
+ jb->bitmaps = vmalloc( mem ) ;
+ if (!jb->bitmaps) {
+ reiserfs_warning("clm-2000, unable to allocate bitmaps for journal lists\n") ;
+ failed = 1;
+ break ;
+ }
+ memset(jb->bitmaps, 0, mem) ;
+ }
+ if (failed) {
+ free_list_bitmaps(p_s_sb, jb_array) ;
+ return -1 ;
+ }
+ return 0 ;
+}
+
+/*
+** find an available list bitmap. If you can't find one, flush a commit list
+** and try again
+*/
+static struct reiserfs_list_bitmap *
+get_list_bitmap(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
+ int i,j ;
+ struct reiserfs_list_bitmap *jb = NULL ;
+
+ for (j = 0 ; j < (JOURNAL_NUM_BITMAPS * 3) ; j++) {
+ i = SB_JOURNAL(p_s_sb)->j_list_bitmap_index ;
+ SB_JOURNAL(p_s_sb)->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS ;
+ jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ;
+ if (SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list) {
+ flush_commit_list(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list, 1) ;
+ if (!SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list) {
+ break ;
+ }
+ } else {
+ break ;
+ }
+ }
+ if (jb->journal_list) { /* double check to make sure if flushed correctly */
+ return NULL ;
+ }
+ jb->journal_list = jl ;
+ return jb ;
+}
+
+/*
+** allocates a new chunk of X nodes, and links them all together as a list.
+** Uses the cnode->next and cnode->prev pointers
+** returns NULL on failure
+*/
+static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) {
+ struct reiserfs_journal_cnode *head ;
+ int i ;
+ if (num_cnodes <= 0) {
+ return NULL ;
+ }
+ head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
+ if (!head) {
+ return NULL ;
+ }
+ memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
+ head[0].prev = NULL ;
+ head[0].next = head + 1 ;
+ for (i = 1 ; i < num_cnodes; i++) {
+ head[i].prev = head + (i - 1) ;
+ head[i].next = head + (i + 1) ; /* if last one, overwrite it after the if */
+ }
+ head[num_cnodes -1].next = NULL ;
+ return head ;
+}
+
+/*
+** pulls a cnode off the free list, or returns NULL on failure
+*/
+static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb) {
+ struct reiserfs_journal_cnode *cn ;
+
+ reiserfs_check_lock_depth("get_cnode") ;
+
+ if (SB_JOURNAL(p_s_sb)->j_cnode_free <= 0) {
+ return NULL ;
+ }
+ SB_JOURNAL(p_s_sb)->j_cnode_used++ ;
+ SB_JOURNAL(p_s_sb)->j_cnode_free-- ;
+ cn = SB_JOURNAL(p_s_sb)->j_cnode_free_list ;
+ if (!cn) {
+ return cn ;
+ }
+ if (cn->next) {
+ cn->next->prev = NULL ;
+ }
+ SB_JOURNAL(p_s_sb)->j_cnode_free_list = cn->next ;
+ memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ;
+ return cn ;
+}
+
+/*
+** returns a cnode to the free list
+*/
+static void free_cnode(struct super_block *p_s_sb, struct reiserfs_journal_cnode *cn) {
+
+ reiserfs_check_lock_depth("free_cnode") ;
+
+ SB_JOURNAL(p_s_sb)->j_cnode_used-- ;
+ SB_JOURNAL(p_s_sb)->j_cnode_free++ ;
+ /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
+ cn->next = SB_JOURNAL(p_s_sb)->j_cnode_free_list ;
+ if (SB_JOURNAL(p_s_sb)->j_cnode_free_list) {
+ SB_JOURNAL(p_s_sb)->j_cnode_free_list->prev = cn ;
+ }
+ cn->prev = NULL ; /* not needed with the memset, but I might kill the memset, and forget to do this */
+ SB_JOURNAL(p_s_sb)->j_cnode_free_list = cn ;
+}
+
+static int clear_prepared_bits(struct buffer_head *bh) {
+ clear_bit(BH_JPrepared, &bh->b_state) ;
+ return 0 ;
+}
+
+/* buffer is in current transaction */
+inline int buffer_journaled(struct buffer_head *bh) {
+ if (bh)
+ return test_bit(BH_JDirty, &bh->b_state) ;
+ else
+ return 0 ;
+}
+
+/* disk block was taken off free list before being in a finished transation, or written to disk
+** journal_new blocks can be reused immediately, for any purpose
+*/
+inline int buffer_journal_new(struct buffer_head *bh) {
+ if (bh)
+ return test_bit(BH_JNew, &bh->b_state) ;
+ else
+ return 0 ;
+}
+
+inline int mark_buffer_journal_new(struct buffer_head *bh) {
+ if (bh) {
+ set_bit(BH_JNew, &bh->b_state) ;
+ }
+ return 0 ;
+}
+
+inline int mark_buffer_not_journaled(struct buffer_head *bh) {
+ if (bh)
+ clear_bit(BH_JDirty, &bh->b_state) ;
+ return 0 ;
+}
+
+/* utility function to force a BUG if it is called without the big
+** kernel lock held. caller is the string printed just before calling BUG()
+*/
+void reiserfs_check_lock_depth(char *caller) {
+#ifdef CONFIG_SMP
+ if (current->lock_depth < 0) {
+ printk("%s called without kernel lock held\n", caller) ;
+ show_reiserfs_locks() ;
+ BUG() ;
+ }
+#else
+ ;
+#endif
+}
+
+/* return a cnode with same dev, block number and size in table, or null if not found */
+static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct reiserfs_journal_cnode **table,
+ kdev_t dev,long bl,int size) {
+ struct reiserfs_journal_cnode *cn ;
+ cn = journal_hash(table, dev, bl) ;
+ while(cn) {
+ if ((cn->blocknr == bl) && (cn->dev == dev))
+ return cn ;
+ cn = cn->hnext ;
+ }
+ return (struct reiserfs_journal_cnode *)0 ;
+}
+
+/* returns a cnode with same size, block number and dev as bh in the current transaction hash. NULL if not found */
+static inline struct reiserfs_journal_cnode *get_journal_hash(struct super_block *p_s_sb, struct buffer_head *bh) {
+ struct reiserfs_journal_cnode *cn ;
+ if (bh) {
+ cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_hash_table, bh->b_dev, bh->b_blocknr, bh->b_size) ;
+ }
+ else {
+ return (struct reiserfs_journal_cnode *)0 ;
+ }
+ return cn ;
+}
+
+/* once upon a time, the journal would deadlock. a lot. Now, when
+** CONFIG_REISERFS_CHECK is defined, anytime someone enters a
+** transaction, it pushes itself into this ugly static list, and pops
+** itself off before calling journal_end. I made a SysRq key to dump
+** the list, and tell me what the writers are when I'm deadlocked. */
+
+ /* are you depending on the compiler
+ to optimize this function away
+ everywhere it is called? It is not
+ obvious how this works, but I
+ suppose debugging code need not be
+ clear. -Hans */
+static char *journal_writers[512] ;
+int push_journal_writer(char *s) {
+#ifdef CONFIG_REISERFS_CHECK
+ int i ;
+ for (i = 0 ; i < 512 ; i++) {
+ if (!journal_writers[i]) {
+ journal_writers[i] = s ;
+ return i ;
+ }
+ }
+ return -1 ;
+#else
+ return 0 ;
+#endif
+}
+int pop_journal_writer(int index) {
+#ifdef CONFIG_REISERFS_CHECK
+ if (index >= 0) {
+ journal_writers[index] = NULL ;
+ }
+#endif
+ return 0 ;
+}
+
+int dump_journal_writers(void) {
+ int i ;
+ for (i = 0 ; i < 512 ; i++) {
+ if (journal_writers[i]) {
+ printk("%d: %s\n", i, journal_writers[i]) ;
+ }
+ }
+ return 0 ;
+}
+
+/*
+** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
+** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
+** being overwritten by a replay after crashing.
+**
+** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
+** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
+** sure you never write the block without logging it.
+**
+** next_zero_bit is a suggestion about the next block to try for find_forward.
+** when bl is rejected because it is set in a journal list bitmap, we search
+** for the next zero bit in the bitmap that rejected bl. Then, we return that
+** through next_zero_bit for find_forward to try.
+**
+** Just because we return something in next_zero_bit does not mean we won't
+** reject it on the next call to reiserfs_in_journal
+**
+*/
+int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev,
+ unsigned long bl, int size, int search_all,
+ unsigned long *next_zero_bit) {
+ struct reiserfs_journal_cnode *cn ;
+ struct reiserfs_list_bitmap *jb ;
+ int i ;
+ int bmap_nr = bl / (p_s_sb->s_blocksize << 3) ;
+ int bit_nr = bl % (p_s_sb->s_blocksize << 3) ;
+ int tmp_bit ;
+
+ *next_zero_bit = 0 ; /* always start this at zero. */
+
+ /* we aren't logging all blocks are safe for reuse */
+ if (reiserfs_dont_log(p_s_sb)) {
+ return 0 ;
+ }
+
+ /* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
+ ** if we crash before the transaction that freed it commits, this transaction won't
+ ** have committed either, and the block will never be written
+ */
+ if (search_all) {
+ for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
+ jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ;
+ if (jb->journal_list && jb->bitmaps[bmap_nr] &&
+ test_bit(bit_nr, jb->bitmaps[bmap_nr]->data)) {
+ tmp_bit = find_next_zero_bit((unsigned long *)
+ (jb->bitmaps[bmap_nr]->data),
+ p_s_sb->s_blocksize << 3, bit_nr+1) ;
+ *next_zero_bit = bmap_nr * (p_s_sb->s_blocksize << 3) + tmp_bit ;
+ return 1 ;
+ }
+ }
+ }
+
+ /* is it in any old transactions? */
+ if (search_all && (cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, dev,bl,size))) {
+ return 1;
+ }
+
+ /* is it in the current transaction. This should never happen */
+ if ((cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_hash_table, dev,bl,size))) {
+ return 1;
+ }
+
+ /* safe for reuse */
+ return 0 ;
+}
+
+/* insert cn into table
+*/
+inline void insert_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_cnode *cn) {
+ struct reiserfs_journal_cnode *cn_orig ;
+
+ cn_orig = journal_hash(table, cn->dev, cn->blocknr) ;
+ cn->hnext = cn_orig ;
+ cn->hprev = NULL ;
+ if (cn_orig) {
+ cn_orig->hprev = cn ;
+ }
+ journal_hash(table, cn->dev, cn->blocknr) = cn ;
+}
+
+/* lock the current transaction */
+inline static void lock_journal(struct super_block *p_s_sb) {
+ while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_wlock)) > 0) {
+ sleep_on(&(SB_JOURNAL(p_s_sb)->j_wait)) ;
+ }
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_wlock), 1) ;
+}
+
+/* unlock the current transaction */
+inline static void unlock_journal(struct super_block *p_s_sb) {
+ atomic_dec(&(SB_JOURNAL(p_s_sb)->j_wlock)) ;
+ wake_up(&(SB_JOURNAL(p_s_sb)->j_wait)) ;
+}
+
+/*
+** this used to be much more involved, and I'm keeping it just in case things get ugly again.
+** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
+** transaction.
+*/
+static void cleanup_freed_for_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
+
+ struct reiserfs_list_bitmap *jb = jl->j_list_bitmap ;
+ if (jb) {
+ cleanup_bitmap_list(p_s_sb, jb) ;
+ }
+ jl->j_list_bitmap->journal_list = NULL ;
+ jl->j_list_bitmap = NULL ;
+}
+
+/*
+** if this journal list still has commit blocks unflushed, send them to disk.
+**
+** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
+** Before the commit block can by written, every other log block must be safely on disk
+**
+*/
+static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) {
+ int i, count ;
+ int index = 0 ;
+ int bn ;
+ int retry_count = 0 ;
+ int orig_commit_left = 0 ;
+ struct buffer_head *tbh = NULL ;
+ struct reiserfs_journal_list *other_jl ;
+
+ reiserfs_check_lock_depth("flush_commit_list") ;
+
+ if (atomic_read(&jl->j_older_commits_done)) {
+ return 0 ;
+ }
+
+ /* before we can put our commit blocks on disk, we have to make sure everyone older than
+ ** us is on disk too
+ */
+ if (jl->j_len <= 0) {
+ return 0 ;
+ }
+ if (flushall) {
+ /* we _must_ make sure the transactions are committed in order. Start with the
+ ** index after this one, wrap all the way around
+ */
+ index = (jl - SB_JOURNAL_LIST(s)) + 1 ;
+ for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
+ other_jl = SB_JOURNAL_LIST(s) + ( (index + i) % JOURNAL_LIST_COUNT) ;
+ if (other_jl && other_jl != jl && other_jl->j_len > 0 && other_jl->j_trans_id > 0 &&
+ other_jl->j_trans_id <= jl->j_trans_id && (atomic_read(&(jl->j_older_commits_done)) == 0)) {
+ flush_commit_list(s, other_jl, 0) ;
+ }
+ }
+ }
+
+ count = 0 ;
+ /* don't flush the commit list for the current transactoin */
+ if (jl == ((SB_JOURNAL_LIST(s) + SB_JOURNAL_LIST_INDEX(s)))) {
+ return 0 ;
+ }
+
+ /* make sure nobody is trying to flush this one at the same time */
+ if (atomic_read(&(jl->j_commit_flushing))) {
+ sleep_on(&(jl->j_commit_wait)) ;
+ if (flushall) {
+ atomic_set(&(jl->j_older_commits_done), 1) ;
+ }
+ return 0 ;
+ }
+
+ /* this commit is done, exit */
+ if (atomic_read(&(jl->j_commit_left)) <= 0) {
+ if (flushall) {
+ atomic_set(&(jl->j_older_commits_done), 1) ;
+ }
+ return 0 ;
+ }
+ /* keeps others from flushing while we are flushing */
+ atomic_set(&(jl->j_commit_flushing), 1) ;
+
+
+ if (jl->j_len > JOURNAL_TRANS_MAX) {
+ reiserfs_panic(s, "journal-512: flush_commit_list: length is %lu, list number %d\n", jl->j_len, jl - SB_JOURNAL_LIST(s)) ;
+ return 0 ;
+ }
+
+ orig_commit_left = atomic_read(&(jl->j_commit_left)) ;
+
+ /* start by checking all the commit blocks in this transaction.
+ ** Add anyone not on disk into tbh. Stop checking once commit_left <= 1, because that means we
+ ** only have the commit block left
+ */
+retry:
+ count = 0 ;
+ for (i = 0 ; atomic_read(&(jl->j_commit_left)) > 1 && i < (jl->j_len + 1) ; i++) { /* everything but commit_bh */
+ bn = reiserfs_get_journal_block(s) + (jl->j_start+i) % JOURNAL_BLOCK_COUNT;
+ tbh = get_hash_table(s->s_dev, bn, s->s_blocksize) ;
+
+/* kill this sanity check */
+if (count > (orig_commit_left + 2)) {
+reiserfs_panic(s, "journal-539: flush_commit_list: BAD count(%d) > orig_commit_left(%d)!\n", count, orig_commit_left) ;
+}
+ if (tbh) {
+ if (buffer_locked(tbh)) { /* wait on it, redo it just to make sure */
+ wait_on_buffer(tbh) ;
+ if (!buffer_uptodate(tbh)) {
+ reiserfs_panic(s, "journal-584, buffer write failed\n") ;
+ }
+ }
+ if (buffer_dirty(tbh)) {
+ printk("journal-569: flush_commit_list, block already dirty!\n") ;
+ } else {
+ mark_buffer_dirty(tbh) ;
+ }
+ ll_rw_block(WRITE, 1, &tbh) ;
+ count++ ;
+ atomic_dec(&(tbh->b_count)) ; /* once for our get_hash */
+ }
+ }
+
+ /* wait on everyone in tbh before writing commit block*/
+ if (count > 0) {
+ for (i = 0 ; atomic_read(&(jl->j_commit_left)) > 1 &&
+ i < (jl->j_len + 1) ; i++) { /* everything but commit_bh */
+ bn = reiserfs_get_journal_block(s) + (jl->j_start + i) % JOURNAL_BLOCK_COUNT ;
+ tbh = get_hash_table(s->s_dev, bn, s->s_blocksize) ;
+
+ wait_on_buffer(tbh) ;
+ if (!buffer_uptodate(tbh)) {
+ reiserfs_panic(s, "journal-601, buffer write failed\n") ;
+ }
+ atomic_dec(&(tbh->b_count)) ; /* once for our get_hash */
+ bforget(tbh) ; /* once due to original getblk in do_journal_end */
+ atomic_dec(&(jl->j_commit_left)) ;
+ }
+ }
+
+ if (atomic_read(&(jl->j_commit_left)) != 1) { /* just the commit_bh left, flush it without calling getblk for everyone */
+ if (retry_count < 2) {
+ printk("journal-582: flush_commit_list, not all log blocks on disk yet, trying again\n") ;
+ retry_count++ ;
+ goto retry;
+ }
+ reiserfs_panic(s, "journal-563: flush_commit_list: BAD, j_commit_left is %lu, should be 1\n",
+ atomic_read(&(jl->j_commit_left)));
+ }
+
+ mark_buffer_dirty(jl->j_commit_bh) ;
+ ll_rw_block(WRITE, 1, &(jl->j_commit_bh)) ;
+ wait_on_buffer(jl->j_commit_bh) ;
+ if (!buffer_uptodate(jl->j_commit_bh)) {
+ reiserfs_panic(s, "journal-615: buffer write failed\n") ;
+ }
+ atomic_dec(&(jl->j_commit_left)) ;
+ bforget(jl->j_commit_bh) ;
+
+ /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
+ cleanup_freed_for_journal_list(s, jl) ;
+
+ if (flushall) {
+ atomic_set(&(jl->j_older_commits_done), 1) ;
+ }
+ atomic_set(&(jl->j_commit_flushing), 0) ;
+ wake_up(&(jl->j_commit_wait)) ;
+ return 0 ;
+}
+
+/*
+** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
+** returns NULL if it can't find anything
+*/
+static struct reiserfs_journal_list *find_newer_jl_for_cn(struct reiserfs_journal_cnode *cn) {
+ kdev_t dev = cn->dev;
+ unsigned long blocknr = cn->blocknr ;
+
+ cn = cn->hprev ;
+ while(cn) {
+ if (cn->dev == dev && cn->blocknr == blocknr && cn->jlist) {
+ return cn->jlist ;
+ }
+ cn = cn->hprev ;
+ }
+ return NULL ;
+}
+
+
+/*
+** once all the real blocks have been flushed, it is safe to remove them from the
+** journal list for this transaction. Aside from freeing the cnode, this also allows the
+** block to be reallocated for data blocks if it had been deleted.
+*/
+static void remove_all_from_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl, int debug) {
+ struct buffer_head fake_bh ;
+ struct reiserfs_journal_cnode *cn, *last ;
+ cn = jl->j_realblock ;
+
+ /* which is better, to lock once around the whole loop, or
+ ** to lock for each call to remove_from_journal_list?
+ */
+ while(cn) {
+ if (cn->blocknr != 0) {
+ if (debug) {
+ printk("block %lu, bh is %d, state %d\n", cn->blocknr, cn->bh ? 1: 0,
+ cn->state) ;
+ }
+ fake_bh.b_blocknr = cn->blocknr ;
+ fake_bh.b_dev = cn->dev ;
+ cn->state = 0 ;
+ remove_from_journal_list(p_s_sb, jl, &fake_bh, 1) ;
+ }
+ last = cn ;
+ cn = cn->next ;
+ free_cnode(p_s_sb, last) ;
+ }
+ jl->j_realblock = NULL ;
+}
+
+/*
+** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
+** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
+** releasing blocks in this transaction for reuse as data blocks.
+** called by flush_journal_list, before it calls remove_all_from_journal_list
+**
+*/
+static int update_journal_header_block(struct super_block *p_s_sb, unsigned long offset, unsigned long trans_id) {
+ struct reiserfs_journal_header *jh ;
+ if (trans_id >= SB_JOURNAL(p_s_sb)->j_last_flush_trans_id) {
+ if (buffer_locked((SB_JOURNAL(p_s_sb)->j_header_bh))) {
+ wait_on_buffer((SB_JOURNAL(p_s_sb)->j_header_bh)) ;
+ if (!buffer_uptodate(SB_JOURNAL(p_s_sb)->j_header_bh)) {
+ reiserfs_panic(p_s_sb, "journal-699: buffer write failed\n") ;
+ }
+ }
+ SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = trans_id ;
+ SB_JOURNAL(p_s_sb)->j_first_unflushed_offset = offset ;
+ jh = (struct reiserfs_journal_header *)(SB_JOURNAL(p_s_sb)->j_header_bh->b_data) ;
+ jh->j_last_flush_trans_id = cpu_to_le32(trans_id) ;
+ jh->j_first_unflushed_offset = cpu_to_le32(offset) ;
+ jh->j_mount_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_mount_id) ;
+ set_bit(BH_Dirty, &(SB_JOURNAL(p_s_sb)->j_header_bh->b_state)) ;
+ ll_rw_block(WRITE, 1, &(SB_JOURNAL(p_s_sb)->j_header_bh)) ;
+ wait_on_buffer((SB_JOURNAL(p_s_sb)->j_header_bh)) ;
+ if (!buffer_uptodate(SB_JOURNAL(p_s_sb)->j_header_bh)) {
+ reiserfs_panic(p_s_sb, "journal-712: buffer write failed\n") ;
+ }
+ }
+ return 0 ;
+}
+
+/*
+** flush any and all journal lists older than you are
+** can only be called from flush_journal_list
+*/
+static int flush_older_journal_lists(struct super_block *p_s_sb, struct reiserfs_journal_list *jl, unsigned long trans_id) {
+ int i, index ;
+ struct reiserfs_journal_list *other_jl ;
+
+ index = jl - SB_JOURNAL_LIST(p_s_sb) ;
+ for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
+ other_jl = SB_JOURNAL_LIST(p_s_sb) + ((index + i) % JOURNAL_LIST_COUNT) ;
+ if (other_jl && other_jl->j_len > 0 &&
+ other_jl->j_trans_id > 0 &&
+ other_jl->j_trans_id < trans_id &&
+ other_jl != jl) {
+ /* do not flush all */
+ flush_journal_list(p_s_sb, other_jl, 0) ;
+ }
+ }
+ return 0 ;
+}
+
+static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) {
+ if (buffer_journaled(bh)) {
+ reiserfs_warning("clm-2084: pinned buffer %u:%s sent to disk\n",
+ bh->b_blocknr, kdevname(bh->b_dev)) ;
+ }
+ mark_buffer_uptodate(bh, uptodate) ;
+ unlock_buffer(bh) ;
+}
+static void submit_logged_buffer(struct buffer_head *bh) {
+ lock_buffer(bh) ;
+ bh->b_end_io = reiserfs_end_buffer_io_sync ;
+ mark_buffer_notjournal_new(bh) ;
+ clear_bit(BH_Dirty, &bh->b_state) ;
+ submit_bh(WRITE, bh) ;
+}
+
+/* flush a journal list, both commit and real blocks
+**
+** always set flushall to 1, unless you are calling from inside
+** flush_journal_list
+**
+** IMPORTANT. This can only be called while there are no journal writers,
+** and the journal is locked. That means it can only be called from
+** do_journal_end, or by journal_release
+*/
+static int flush_journal_list(struct super_block *s,
+ struct reiserfs_journal_list *jl, int flushall) {
+ struct reiserfs_journal_list *pjl ;
+ struct reiserfs_journal_cnode *cn, *last ;
+ int count ;
+ int was_jwait = 0 ;
+ int was_dirty = 0 ;
+ struct buffer_head *saved_bh ;
+ unsigned long j_len_saved = jl->j_len ;
+
+ if (j_len_saved <= 0) {
+ return 0 ;
+ }
+
+ if (atomic_read(&SB_JOURNAL(s)->j_wcount) != 0) {
+ reiserfs_warning("clm-2048: flush_journal_list called with wcount %d\n",
+ atomic_read(&SB_JOURNAL(s)->j_wcount)) ;
+ }
+ /* if someone is getting the commit list, we must wait for them */
+ while (atomic_read(&(jl->j_commit_flushing))) {
+ sleep_on(&(jl->j_commit_wait)) ;
+ }
+ /* if someone is flushing this list, we must wait for them */
+ while (atomic_read(&(jl->j_flushing))) {
+ sleep_on(&(jl->j_flush_wait)) ;
+ }
+
+ /* this list is now ours, we can change anything we want */
+ atomic_set(&(jl->j_flushing), 1) ;
+
+ count = 0 ;
+ if (j_len_saved > JOURNAL_TRANS_MAX) {
+ reiserfs_panic(s, "journal-715: flush_journal_list, length is %lu, list number %d\n", j_len_saved, jl - SB_JOURNAL_LIST(s)) ;
+ atomic_dec(&(jl->j_flushing)) ;
+ return 0 ;
+ }
+
+ /* if all the work is already done, get out of here */
+ if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
+ atomic_read(&(jl->j_commit_left)) <= 0) {
+ goto flush_older_and_return ;
+ }
+
+ /* start by putting the commit list on disk. This will also flush
+ ** the commit lists of any olders transactions
+ */
+ flush_commit_list(s, jl, 1) ;
+
+ /* are we done now? */
+ if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
+ atomic_read(&(jl->j_commit_left)) <= 0) {
+ goto flush_older_and_return ;
+ }
+
+ /* loop through each cnode, see if we need to write it,
+ ** or wait on a more recent transaction, or just ignore it
+ */
+ if (atomic_read(&(SB_JOURNAL(s)->j_wcount)) != 0) {
+ reiserfs_panic(s, "journal-844: panic journal list is flushing, wcount is not 0\n") ;
+ }
+ cn = jl->j_realblock ;
+ while(cn) {
+ was_jwait = 0 ;
+ was_dirty = 0 ;
+ saved_bh = NULL ;
+ /* blocknr of 0 is no longer in the hash, ignore it */
+ if (cn->blocknr == 0) {
+ goto free_cnode ;
+ }
+ pjl = find_newer_jl_for_cn(cn) ;
+ /* the order is important here. We check pjl to make sure we
+ ** don't clear BH_JDirty_wait if we aren't the one writing this
+ ** block to disk
+ */
+ if (!pjl && cn->bh) {
+ saved_bh = cn->bh ;
+
+ /* we do this to make sure nobody releases the buffer while
+ ** we are working with it
+ */
+ atomic_inc(&(saved_bh->b_count)) ;
+
+ if (buffer_journal_dirty(saved_bh)) {
+ was_jwait = 1 ;
+ mark_buffer_notjournal_dirty(saved_bh) ;
+ /* brelse the inc from journal_mark_dirty */
+ atomic_dec(&(saved_bh->b_count)) ;
+ }
+ if (can_dirty(cn)) {
+ was_dirty = 1 ;
+ }
+ }
+
+ /* if someone has this block in a newer transaction, just make
+ ** sure they are commited, and don't try writing it to disk
+ */
+ if (pjl) {
+ flush_commit_list(s, pjl, 1) ;
+ goto free_cnode ;
+ }
+
+ /* bh == NULL when the block got to disk on its own, OR,
+ ** the block got freed in a future transaction
+ */
+ if (saved_bh == NULL) {
+ goto free_cnode ;
+ }
+
+ /* this should never happen. kupdate_one_transaction has this list
+ ** locked while it works, so we should never see a buffer here that
+ ** is not marked JDirty_wait
+ */
+ if ((!was_jwait) && !buffer_locked(saved_bh)) {
+printk("journal-813: BAD! buffer %lu %cdirty %cjwait, not in a newer tranasction\n", saved_bh->b_blocknr,
+ was_dirty ? ' ' : '!', was_jwait ? ' ' : '!') ;
+ }
+ /* kupdate_one_transaction waits on the buffers it is writing, so we
+ ** should never see locked buffers here
+ */
+ if (buffer_locked(saved_bh)) {
+ printk("clm-2083: locked buffer %lu in flush_journal_list\n",
+ saved_bh->b_blocknr) ;
+ wait_on_buffer(saved_bh) ;
+ if (!buffer_uptodate(saved_bh)) {
+ reiserfs_panic(s, "journal-923: buffer write failed\n") ;
+ }
+ }
+ if (was_dirty) {
+ /* we inc again because saved_bh gets decremented at free_cnode */
+ atomic_inc(&(saved_bh->b_count)) ;
+ set_bit(BLOCK_NEEDS_FLUSH, &cn->state) ;
+ submit_logged_buffer(saved_bh) ;
+ count++ ;
+ } else {
+ printk("clm-2082: Unable to flush buffer %lu in flush_journal_list\n",
+ saved_bh->b_blocknr) ;
+ }
+free_cnode:
+ last = cn ;
+ cn = cn->next ;
+ if (saved_bh) {
+ /* we incremented this to keep others from taking the buffer head away */
+ atomic_dec(&(saved_bh->b_count));
+ if (atomic_read(&(saved_bh->b_count)) < 0) {
+ printk("journal-945: saved_bh->b_count < 0") ;
+ }
+ }
+ }
+ if (count > 0) {
+ cn = jl->j_realblock ;
+ while(cn) {
+ if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
+ if (!cn->bh) {
+ reiserfs_panic(s, "journal-1011: cn->bh is NULL\n") ;
+ }
+ wait_on_buffer(cn->bh) ;
+ if (!cn->bh) {
+ reiserfs_panic(s, "journal-1012: cn->bh is NULL\n") ;
+ }
+ if (!buffer_uptodate(cn->bh)) {
+ reiserfs_panic(s, "journal-949: buffer write failed\n") ;
+ }
+ refile_buffer(cn->bh) ;
+ brelse(cn->bh) ;
+ }
+ cn = cn->next ;
+ }
+ }
+
+flush_older_and_return:
+ /* before we can update the journal header block, we _must_ flush all
+ ** real blocks from all older transactions to disk. This is because
+ ** once the header block is updated, this transaction will not be
+ ** replayed after a crash
+ */
+ if (flushall) {
+ flush_older_journal_lists(s, jl, jl->j_trans_id) ;
+ }
+
+ /* before we can remove everything from the hash tables for this
+ ** transaction, we must make sure it can never be replayed
+ **
+ ** since we are only called from do_journal_end, we know for sure there
+ ** are no allocations going on while we are flushing journal lists. So,
+ ** we only need to update the journal header block for the last list
+ ** being flushed
+ */
+ if (flushall) {
+ update_journal_header_block(s, (jl->j_start + jl->j_len + 2) % JOURNAL_BLOCK_COUNT, jl->j_trans_id) ;
+ }
+ remove_all_from_journal_list(s, jl, 0) ;
+ jl->j_len = 0 ;
+ atomic_set(&(jl->j_nonzerolen), 0) ;
+ jl->j_start = 0 ;
+ jl->j_realblock = NULL ;
+ jl->j_commit_bh = NULL ;
+ jl->j_trans_id = 0 ;
+ atomic_dec(&(jl->j_flushing)) ;
+ wake_up(&(jl->j_flush_wait)) ;
+ return 0 ;
+}
+
+
+static int kupdate_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ struct reiserfs_journal_list *pjl ; /* previous list for this cn */
+ struct reiserfs_journal_cnode *cn, *walk_cn ;
+ unsigned long blocknr ;
+ int run = 0 ;
+ int orig_trans_id = jl->j_trans_id ;
+ struct buffer_head *saved_bh ;
+ int ret = 0 ;
+
+ /* if someone is getting the commit list, we must wait for them */
+ while (atomic_read(&(jl->j_commit_flushing))) {
+ sleep_on(&(jl->j_commit_wait)) ;
+ }
+ /* if someone is flushing this list, we must wait for them */
+ while (atomic_read(&(jl->j_flushing))) {
+ sleep_on(&(jl->j_flush_wait)) ;
+ }
+ /* was it flushed while we slept? */
+ if (jl->j_len <= 0 || jl->j_trans_id != orig_trans_id) {
+ return 0 ;
+ }
+
+ /* this list is now ours, we can change anything we want */
+ atomic_set(&(jl->j_flushing), 1) ;
+
+loop_start:
+ cn = jl->j_realblock ;
+ while(cn) {
+ saved_bh = NULL ;
+ /* if the blocknr == 0, this has been cleared from the hash,
+ ** skip it
+ */
+ if (cn->blocknr == 0) {
+ goto next ;
+ }
+ /* look for a more recent transaction that logged this
+ ** buffer. Only the most recent transaction with a buffer in
+ ** it is allowed to send that buffer to disk
+ */
+ pjl = find_newer_jl_for_cn(cn) ;
+ if (run == 0 && !pjl && cn->bh && buffer_journal_dirty(cn->bh) &&
+ can_dirty(cn))
+ {
+ if (!test_bit(BH_JPrepared, &cn->bh->b_state)) {
+ set_bit(BLOCK_NEEDS_FLUSH, &cn->state) ;
+ submit_logged_buffer(cn->bh) ;
+ } else {
+ /* someone else is using this buffer. We can't
+ ** send it to disk right now because they might
+ ** be changing/logging it.
+ */
+ ret = 1 ;
+ }
+ } else if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
+ clear_bit(BLOCK_NEEDS_FLUSH, &cn->state) ;
+ if (!pjl && cn->bh) {
+ wait_on_buffer(cn->bh) ;
+ }
+ /* check again, someone could have logged while we scheduled */
+ pjl = find_newer_jl_for_cn(cn) ;
+
+ /* before the JDirty_wait bit is set, the
+ ** buffer is added to the hash list. So, if we are
+ ** run in the middle of a do_journal_end, we will notice
+ ** if this buffer was logged and added from the latest
+ ** transaction. In this case, we don't want to decrement
+ ** b_count
+ */
+ if (!pjl && cn->bh && buffer_journal_dirty(cn->bh)) {
+ blocknr = cn->blocknr ;
+ walk_cn = cn ;
+ saved_bh= cn->bh ;
+ /* update all older transactions to show this block
+ ** was flushed
+ */
+ mark_buffer_notjournal_dirty(cn->bh) ;
+ while(walk_cn) {
+ if (walk_cn->bh && walk_cn->blocknr == blocknr &&
+ walk_cn->dev == cn->dev) {
+ if (walk_cn->jlist) {
+ atomic_dec(&(walk_cn->jlist->j_nonzerolen)) ;
+ }
+ walk_cn->bh = NULL ;
+ }
+ walk_cn = walk_cn->hnext ;
+ }
+ if (atomic_read(&saved_bh->b_count) < 1) {
+ reiserfs_warning("clm-2081: bad count on %lu\n",
+ saved_bh->b_blocknr) ;
+ }
+ brelse(saved_bh) ;
+ }
+ }
+ /*
+ ** if the more recent transaction is committed to the log,
+ ** this buffer can be considered flushed. Decrement our
+ ** counters to reflect one less buffer that needs writing.
+ **
+ ** note, this relies on all of the above code being
+ ** schedule free once pjl comes back non-null.
+ */
+ if (pjl && cn->bh && atomic_read(&pjl->j_commit_left) == 0) {
+ atomic_dec(&cn->jlist->j_nonzerolen) ;
+ cn->bh = NULL ;
+ }
+next:
+ cn = cn->next ;
+ }
+ /* the first run through the loop sends all the dirty buffers to
+ ** ll_rw_block.
+ ** the second run through the loop does all the accounting
+ */
+ if (run++ == 0) {
+ goto loop_start ;
+ }
+
+ atomic_set(&(jl->j_flushing), 0) ;
+ wake_up(&(jl->j_flush_wait)) ;
+ return ret ;
+}
+/* since we never give dirty buffers to bdflush/kupdate, we have to
+** flush them ourselves. This runs through the journal lists, finds
+** old metadata in need of flushing and sends it to disk.
+** this does not end transactions, commit anything, or free
+** cnodes.
+**
+** returns the highest transaction id that was flushed last time
+*/
+static unsigned long reiserfs_journal_kupdate(struct super_block *s) {
+ struct reiserfs_journal_list *jl ;
+ int i ;
+ int start ;
+ time_t age ;
+ int ret = 0 ;
+
+ start = SB_JOURNAL_LIST_INDEX(s) ;
+
+ /* safety check to prevent flush attempts during a mount */
+ if (start < 0) {
+ return 0 ;
+ }
+ i = (start + 1) % JOURNAL_LIST_COUNT ;
+ while(i != start) {
+ jl = SB_JOURNAL_LIST(s) + i ;
+ age = CURRENT_TIME - jl->j_timestamp ;
+ if (jl->j_len > 0 && // age >= (JOURNAL_MAX_COMMIT_AGE * 2) &&
+ atomic_read(&(jl->j_nonzerolen)) > 0 &&
+ atomic_read(&(jl->j_commit_left)) == 0) {
+
+ if (jl->j_trans_id == SB_JOURNAL(s)->j_trans_id) {
+ break ;
+ }
+ /* if ret was already 1, we want to preserve that */
+ ret |= kupdate_one_transaction(s, jl) ;
+ }
+ if (atomic_read(&(jl->j_nonzerolen)) > 0) {
+ ret |= 1 ;
+ }
+ i = (i + 1) % JOURNAL_LIST_COUNT ;
+ }
+ return ret ;
+}
+
+/*
+** removes any nodes in table with name block and dev as bh.
+** only touchs the hnext and hprev pointers.
+*/
+void remove_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_list *jl,struct buffer_head *bh,
+ int remove_freed){
+ struct reiserfs_journal_cnode *cur ;
+ struct reiserfs_journal_cnode **head ;
+
+ if (!bh)
+ return ;
+
+ head= &(journal_hash(table, bh->b_dev, bh->b_blocknr)) ;
+ if (!head) {
+ return ;
+ }
+ cur = *head ;
+ while(cur) {
+ if (cur->blocknr == bh->b_blocknr && cur->dev == bh->b_dev && (jl == NULL || jl == cur->jlist) &&
+ (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
+ if (cur->hnext) {
+ cur->hnext->hprev = cur->hprev ;
+ }
+ if (cur->hprev) {
+ cur->hprev->hnext = cur->hnext ;
+ } else {
+ *head = cur->hnext ;
+ }
+ cur->blocknr = 0 ;
+ cur->dev = 0 ;
+ cur->state = 0 ;
+ if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
+ atomic_dec(&(cur->jlist->j_nonzerolen)) ;
+ cur->bh = NULL ;
+ cur->jlist = NULL ;
+ }
+ cur = cur->hnext ;
+ }
+}
+
+static void free_journal_ram(struct super_block *p_s_sb) {
+ vfree(SB_JOURNAL(p_s_sb)->j_cnode_free_orig) ;
+ free_list_bitmaps(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap) ;
+ free_bitmap_nodes(p_s_sb) ; /* must be after free_list_bitmaps */
+ if (SB_JOURNAL(p_s_sb)->j_header_bh) {
+ brelse(SB_JOURNAL(p_s_sb)->j_header_bh) ;
+ }
+ vfree(SB_JOURNAL(p_s_sb)) ;
+}
+
+/*
+** call on unmount. Only set error to 1 if you haven't made your way out
+** of read_super() yet. Any other caller must keep error at 0.
+*/
+static int do_journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, int error) {
+ struct reiserfs_transaction_handle myth ;
+
+ /* we only want to flush out transactions if we were called with error == 0
+ */
+ if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
+ /* end the current trans */
+ do_journal_end(th, p_s_sb,10, FLUSH_ALL) ;
+
+ /* make sure something gets logged to force our way into the flush code */
+ journal_join(&myth, p_s_sb, 1) ;
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ do_journal_end(&myth, p_s_sb,1, FLUSH_ALL) ;
+ }
+
+ /* we decrement before we wake up, because the commit thread dies off
+ ** when it has been woken up and the count is <= 0
+ */
+ reiserfs_mounted_fs_count-- ;
+ wake_up(&reiserfs_commit_thread_wait) ;
+ sleep_on(&reiserfs_commit_thread_done) ;
+
+ free_journal_ram(p_s_sb) ;
+
+ return 0 ;
+}
+
+/*
+** call on unmount. flush all journal trans, release all alloc'd ram
+*/
+int journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
+ return do_journal_release(th, p_s_sb, 0) ;
+}
+/*
+** only call from an error condition inside reiserfs_read_super!
+*/
+int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
+ return do_journal_release(th, p_s_sb, 1) ;
+}
+
+/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
+static int journal_compare_desc_commit(struct super_block *p_s_sb, struct reiserfs_journal_desc *desc,
+ struct reiserfs_journal_commit *commit) {
+ if (le32_to_cpu(commit->j_trans_id) != le32_to_cpu(desc->j_trans_id) ||
+ le32_to_cpu(commit->j_len) != le32_to_cpu(desc->j_len) ||
+ le32_to_cpu(commit->j_len) > JOURNAL_TRANS_MAX ||
+ le32_to_cpu(commit->j_len) <= 0
+ ) {
+ return 1 ;
+ }
+ return 0 ;
+}
+/* returns 0 if it did not find a description block
+** returns -1 if it found a corrupt commit block
+** returns 1 if both desc and commit were valid
+*/
+static int journal_transaction_is_valid(struct super_block *p_s_sb, struct buffer_head *d_bh, unsigned long *oldest_invalid_trans_id, unsigned long *newest_mount_id) {
+ struct reiserfs_journal_desc *desc ;
+ struct reiserfs_journal_commit *commit ;
+ struct buffer_head *c_bh ;
+ unsigned long offset ;
+
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
+ if (le32_to_cpu(desc->j_len) > 0 && !memcmp(desc->j_magic, JOURNAL_DESC_MAGIC, 8)) {
+ if (oldest_invalid_trans_id && *oldest_invalid_trans_id && le32_to_cpu(desc->j_trans_id) > *oldest_invalid_trans_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-986: transaction "
+ "is valid returning because trans_id %d is greater than "
+ "oldest_invalid %lu\n", le32_to_cpu(desc->j_trans_id),
+ *oldest_invalid_trans_id);
+ return 0 ;
+ }
+ if (newest_mount_id && *newest_mount_id > le32_to_cpu(desc->j_mount_id)) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1087: transaction "
+ "is valid returning because mount_id %d is less than "
+ "newest_mount_id %lu\n", desc->j_mount_id,
+ *newest_mount_id) ;
+ return -1 ;
+ }
+ offset = d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb) ;
+
+ /* ok, we have a journal description block, lets see if the transaction was valid */
+ c_bh = bread(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) + ((offset + le32_to_cpu(desc->j_len) + 1) % JOURNAL_BLOCK_COUNT),
+ p_s_sb->s_blocksize) ;
+ if (!c_bh)
+ return 0 ;
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
+ if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
+ "journal_transaction_is_valid, commit offset %ld had bad "
+ "time %d or length %d\n",
+ c_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
+ le32_to_cpu(commit->j_trans_id),
+ le32_to_cpu(commit->j_len));
+ brelse(c_bh) ;
+ if (oldest_invalid_trans_id)
+ *oldest_invalid_trans_id = le32_to_cpu(desc->j_trans_id) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1004: "
+ "transaction_is_valid setting oldest invalid trans_id "
+ "to %d\n", le32_to_cpu(desc->j_trans_id)) ;
+ return -1;
+ }
+ brelse(c_bh) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1006: found valid "
+ "transaction start offset %lu, len %d id %d\n",
+ d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
+ le32_to_cpu(desc->j_len), le32_to_cpu(desc->j_trans_id)) ;
+ return 1 ;
+ } else {
+ return 0 ;
+ }
+}
+
+static void brelse_array(struct buffer_head **heads, int num) {
+ int i ;
+ for (i = 0 ; i < num ; i++) {
+ brelse(heads[i]) ;
+ }
+}
+
+/*
+** given the start, and values for the oldest acceptable transactions,
+** this either reads in a replays a transaction, or returns because the transaction
+** is invalid, or too old.
+*/
+static int journal_read_transaction(struct super_block *p_s_sb, unsigned long cur_dblock, unsigned long oldest_start,
+ unsigned long oldest_trans_id, unsigned long newest_mount_id) {
+ struct reiserfs_journal_desc *desc ;
+ struct reiserfs_journal_commit *commit ;
+ unsigned long trans_id = 0 ;
+ struct buffer_head *c_bh ;
+ struct buffer_head *d_bh ;
+ struct buffer_head **log_blocks = NULL ;
+ struct buffer_head **real_blocks = NULL ;
+ unsigned long trans_offset ;
+ int i;
+
+ d_bh = bread(p_s_sb->s_dev, cur_dblock, p_s_sb->s_blocksize) ;
+ if (!d_bh)
+ return 1 ;
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
+ trans_offset = d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
+ "journal_read_transaction, offset %lu, len %d mount_id %d\n",
+ d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
+ le32_to_cpu(desc->j_len), le32_to_cpu(desc->j_mount_id)) ;
+ if (le32_to_cpu(desc->j_trans_id) < oldest_trans_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
+ "journal_read_trans skipping because %lu is too old\n",
+ cur_dblock - reiserfs_get_journal_block(p_s_sb)) ;
+ brelse(d_bh) ;
+ return 1 ;
+ }
+ if (le32_to_cpu(desc->j_mount_id) != newest_mount_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
+ "journal_read_trans skipping because %d is != "
+ "newest_mount_id %lu\n", le32_to_cpu(desc->j_mount_id),
+ newest_mount_id) ;
+ brelse(d_bh) ;
+ return 1 ;
+ }
+ c_bh = bread(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) + ((trans_offset + le32_to_cpu(desc->j_len) + 1) % JOURNAL_BLOCK_COUNT),
+ p_s_sb->s_blocksize) ;
+ if (!c_bh) {
+ brelse(d_bh) ;
+ return 1 ;
+ }
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
+ if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal_read_transaction, "
+ "commit offset %ld had bad time %d or length %d\n",
+ c_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
+ le32_to_cpu(commit->j_trans_id), le32_to_cpu(commit->j_len));
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ return 1;
+ }
+ trans_id = le32_to_cpu(desc->j_trans_id) ;
+ /* now we know we've got a good transaction, and it was inside the valid time ranges */
+ log_blocks = kmalloc(le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), GFP_BUFFER) ;
+ real_blocks = kmalloc(le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), GFP_BUFFER) ;
+ if (!log_blocks || !real_blocks) {
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ kfree(log_blocks) ;
+ kfree(real_blocks) ;
+ reiserfs_warning("journal-1169: kmalloc failed, unable to mount FS\n") ;
+ return -1 ;
+ }
+ /* get all the buffer heads */
+ for(i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
+ log_blocks[i] = getblk(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) + (trans_offset + 1 + i) % JOURNAL_BLOCK_COUNT, p_s_sb->s_blocksize);
+ if (i < JOURNAL_TRANS_HALF) {
+ real_blocks[i] = getblk(p_s_sb->s_dev, le32_to_cpu(desc->j_realblock[i]), p_s_sb->s_blocksize) ;
+ } else {
+ real_blocks[i] = getblk(p_s_sb->s_dev, le32_to_cpu(commit->j_realblock[i - JOURNAL_TRANS_HALF]), p_s_sb->s_blocksize) ;
+ }
+ if (real_blocks[i]->b_blocknr >= reiserfs_get_journal_block(p_s_sb) &&
+ real_blocks[i]->b_blocknr < (reiserfs_get_journal_block(p_s_sb)+JOURNAL_BLOCK_COUNT)) {
+ reiserfs_warning("journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block\n") ;
+ brelse_array(log_blocks, i) ;
+ brelse_array(real_blocks, i) ;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ kfree(log_blocks) ;
+ kfree(real_blocks) ;
+ return -1 ;
+ }
+ }
+ /* read in the log blocks, memcpy to the corresponding real block */
+ ll_rw_block(READ, le32_to_cpu(desc->j_len), log_blocks) ;
+ for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
+ wait_on_buffer(log_blocks[i]) ;
+ if (!buffer_uptodate(log_blocks[i])) {
+ reiserfs_warning("journal-1212: REPLAY FAILURE fsck required! buffer write failed\n") ;
+ brelse_array(log_blocks + i, le32_to_cpu(desc->j_len) - i) ;
+ brelse_array(real_blocks, le32_to_cpu(desc->j_len)) ;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ kfree(log_blocks) ;
+ kfree(real_blocks) ;
+ return -1 ;
+ }
+ memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, real_blocks[i]->b_size) ;
+ mark_buffer_uptodate(real_blocks[i], 1) ;
+ brelse(log_blocks[i]) ;
+ }
+ /* flush out the real blocks */
+ for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
+ set_bit(BH_Dirty, &(real_blocks[i]->b_state)) ;
+ ll_rw_block(WRITE, 1, real_blocks + i) ;
+ }
+ for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
+ wait_on_buffer(real_blocks[i]) ;
+ if (!buffer_uptodate(real_blocks[i])) {
+ reiserfs_warning("journal-1226: REPLAY FAILURE, fsck required! buffer write failed\n") ;
+ brelse_array(real_blocks + i, le32_to_cpu(desc->j_len) - i) ;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ kfree(log_blocks) ;
+ kfree(real_blocks) ;
+ return -1 ;
+ }
+ brelse(real_blocks[i]) ;
+ }
+ cur_dblock = reiserfs_get_journal_block(p_s_sb) + ((trans_offset + le32_to_cpu(desc->j_len) + 2) % JOURNAL_BLOCK_COUNT) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1095: setting journal "
+ "start to offset %ld\n",
+ cur_dblock - reiserfs_get_journal_block(p_s_sb)) ;
+
+ /* init starting values for the first transaction, in case this is the last transaction to be replayed. */
+ SB_JOURNAL(p_s_sb)->j_start = cur_dblock - reiserfs_get_journal_block(p_s_sb) ;
+ SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = trans_id ;
+ SB_JOURNAL(p_s_sb)->j_trans_id = trans_id + 1;
+ brelse(c_bh) ;
+ brelse(d_bh) ;
+ kfree(log_blocks) ;
+ kfree(real_blocks) ;
+ return 0 ;
+}
+
+/*
+** read and replay the log
+** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
+** transaction. This tests that before finding all the transactions in the log, whic makes normal mount times fast.
+**
+** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
+**
+** On exit, it sets things up so the first transaction will work correctly.
+*/
+static int journal_read(struct super_block *p_s_sb) {
+ struct reiserfs_journal_desc *desc ;
+ unsigned long last_flush_trans_id = 0 ;
+ unsigned long oldest_trans_id = 0;
+ unsigned long oldest_invalid_trans_id = 0 ;
+ time_t start ;
+ unsigned long last_flush_start = 0;
+ unsigned long oldest_start = 0;
+ unsigned long cur_dblock = 0 ;
+ unsigned long newest_mount_id = 9 ;
+ struct buffer_head *d_bh ;
+ struct reiserfs_journal_header *jh ;
+ int valid_journal_header = 0 ;
+ int replay_count = 0 ;
+ int continue_replay = 1 ;
+ int ret ;
+
+ cur_dblock = reiserfs_get_journal_block(p_s_sb) ;
+ printk("reiserfs: checking transaction log (device %s) ...\n",
+ kdevname(p_s_sb->s_dev)) ;
+ start = CURRENT_TIME ;
+
+ /* step 1, read in the journal header block. Check the transaction it says
+ ** is the first unflushed, and if that transaction is not valid,
+ ** replay is done
+ */
+ SB_JOURNAL(p_s_sb)->j_header_bh = bread(p_s_sb->s_dev,
+ reiserfs_get_journal_block(p_s_sb) +
+ JOURNAL_BLOCK_COUNT,
+ p_s_sb->s_blocksize) ;
+ if (!SB_JOURNAL(p_s_sb)->j_header_bh) {
+ return 1 ;
+ }
+ jh = (struct reiserfs_journal_header *)(SB_JOURNAL(p_s_sb)->j_header_bh->b_data) ;
+ if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 &&
+ le32_to_cpu(jh->j_first_unflushed_offset) < JOURNAL_BLOCK_COUNT &&
+ le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
+ last_flush_start = reiserfs_get_journal_block(p_s_sb) +
+ le32_to_cpu(jh->j_first_unflushed_offset) ;
+ last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1153: found in "
+ "header: first_unflushed_offset %d, last_flushed_trans_id "
+ "%lu\n", le32_to_cpu(jh->j_first_unflushed_offset),
+ last_flush_trans_id) ;
+ valid_journal_header = 1 ;
+
+ /* now, we try to read the first unflushed offset. If it is not valid,
+ ** there is nothing more we can do, and it makes no sense to read
+ ** through the whole log.
+ */
+ d_bh = bread(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) + le32_to_cpu(jh->j_first_unflushed_offset), p_s_sb->s_blocksize) ;
+ ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL) ;
+ if (!ret) {
+ continue_replay = 0 ;
+ }
+ brelse(d_bh) ;
+ }
+
+ if (continue_replay && is_read_only(p_s_sb->s_dev)) {
+ printk("clm-2076: device is readonly, unable to replay log\n") ;
+ brelse(SB_JOURNAL(p_s_sb)->j_header_bh) ;
+ SB_JOURNAL(p_s_sb)->j_header_bh = NULL ;
+ return -1 ;
+ }
+ if (continue_replay && (p_s_sb->s_flags & MS_RDONLY)) {
+ printk("Warning, log replay starting on readonly filesystem\n") ;
+ }
+
+ /* ok, there are transactions that need to be replayed. start with the first log block, find
+ ** all the valid transactions, and pick out the oldest.
+ */
+ while(continue_replay && cur_dblock < (reiserfs_get_journal_block(p_s_sb) + JOURNAL_BLOCK_COUNT)) {
+ d_bh = bread(p_s_sb->s_dev, cur_dblock, p_s_sb->s_blocksize) ;
+ ret = journal_transaction_is_valid(p_s_sb, d_bh, &oldest_invalid_trans_id, &newest_mount_id) ;
+ if (ret == 1) {
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
+ if (oldest_start == 0) { /* init all oldest_ values */
+ oldest_trans_id = le32_to_cpu(desc->j_trans_id) ;
+ oldest_start = d_bh->b_blocknr ;
+ newest_mount_id = le32_to_cpu(desc->j_mount_id) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1179: Setting "
+ "oldest_start to offset %lu, trans_id %lu\n",
+ oldest_start - reiserfs_get_journal_block(p_s_sb),
+ oldest_trans_id) ;
+ } else if (oldest_trans_id > le32_to_cpu(desc->j_trans_id)) {
+ /* one we just read was older */
+ oldest_trans_id = le32_to_cpu(desc->j_trans_id) ;
+ oldest_start = d_bh->b_blocknr ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1180: Resetting "
+ "oldest_start to offset %lu, trans_id %lu\n",
+ oldest_start - reiserfs_get_journal_block(p_s_sb),
+ oldest_trans_id) ;
+ }
+ if (newest_mount_id < le32_to_cpu(desc->j_mount_id)) {
+ newest_mount_id = le32_to_cpu(desc->j_mount_id) ;
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
+ "newest_mount_id to %d\n", le32_to_cpu(desc->j_mount_id));
+ }
+ cur_dblock += le32_to_cpu(desc->j_len) + 2 ;
+ }
+ else {
+ cur_dblock++ ;
+ }
+ brelse(d_bh) ;
+ }
+ /* step three, starting at the oldest transaction, replay */
+ if (last_flush_start > 0) {
+ oldest_start = last_flush_start ;
+ oldest_trans_id = last_flush_trans_id ;
+ }
+ cur_dblock = oldest_start ;
+ if (oldest_trans_id) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1206: Starting replay "
+ "from offset %lu, trans_id %lu\n",
+ cur_dblock - reiserfs_get_journal_block(p_s_sb),
+ oldest_trans_id) ;
+
+ }
+ replay_count = 0 ;
+ while(continue_replay && oldest_trans_id > 0) {
+ ret = journal_read_transaction(p_s_sb, cur_dblock, oldest_start, oldest_trans_id, newest_mount_id) ;
+ if (ret < 0) {
+ return ret ;
+ } else if (ret != 0) {
+ break ;
+ }
+ cur_dblock = reiserfs_get_journal_block(p_s_sb) + SB_JOURNAL(p_s_sb)->j_start ;
+ replay_count++ ;
+ }
+
+ if (oldest_trans_id == 0) {
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1225: No valid "
+ "transactions found\n") ;
+ }
+ /* j_start does not get set correctly if we don't replay any transactions.
+ ** if we had a valid journal_header, set j_start to the first unflushed transaction value,
+ ** copy the trans_id from the header
+ */
+ if (valid_journal_header && replay_count == 0) {
+ SB_JOURNAL(p_s_sb)->j_start = le32_to_cpu(jh->j_first_unflushed_offset) ;
+ SB_JOURNAL(p_s_sb)->j_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
+ SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) ;
+ SB_JOURNAL(p_s_sb)->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
+ } else {
+ SB_JOURNAL(p_s_sb)->j_mount_id = newest_mount_id + 1 ;
+ }
+ reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
+ "newest_mount_id to %lu\n", SB_JOURNAL(p_s_sb)->j_mount_id) ;
+ SB_JOURNAL(p_s_sb)->j_first_unflushed_offset = SB_JOURNAL(p_s_sb)->j_start ;
+ if (replay_count > 0) {
+ printk("reiserfs: replayed %d transactions in %lu seconds\n", replay_count,
+ CURRENT_TIME - start) ;
+ }
+ if (!is_read_only(p_s_sb->s_dev)) {
+ update_journal_header_block(p_s_sb, SB_JOURNAL(p_s_sb)->j_start,
+ SB_JOURNAL(p_s_sb)->j_last_flush_trans_id) ;
+ }
+ return 0 ;
+}
+
+
+struct reiserfs_journal_commit_task {
+ struct super_block *p_s_sb ;
+ int jindex ;
+ int wake_on_finish ; /* if this is one, we wake the task_done queue, if it
+ ** is zero, we free the whole struct on finish
+ */
+ struct reiserfs_journal_commit_task *self ;
+ struct wait_queue *task_done ;
+ struct tq_struct task ;
+} ;
+
+static void reiserfs_journal_commit_task_func(struct reiserfs_journal_commit_task *ct) {
+
+ struct reiserfs_journal_list *jl ;
+ jl = SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex ;
+
+ flush_commit_list(ct->p_s_sb, SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex, 1) ;
+ if (jl->j_len > 0 && atomic_read(&(jl->j_nonzerolen)) > 0 &&
+ atomic_read(&(jl->j_commit_left)) == 0) {
+ kupdate_one_transaction(ct->p_s_sb, jl) ;
+ }
+ kfree(ct->self) ;
+}
+
+static void setup_commit_task_arg(struct reiserfs_journal_commit_task *ct,
+ struct super_block *p_s_sb,
+ int jindex) {
+ if (!ct) {
+ reiserfs_panic(NULL, "journal-1360: setup_commit_task_arg called with NULL struct\n") ;
+ }
+ ct->p_s_sb = p_s_sb ;
+ ct->jindex = jindex ;
+ ct->task_done = NULL ;
+ INIT_LIST_HEAD(&ct->task.list) ;
+ ct->task.sync = 0 ;
+ ct->task.routine = (void *)(void *)reiserfs_journal_commit_task_func ;
+ ct->self = ct ;
+ ct->task.data = (void *)ct ;
+}
+
+static void commit_flush_async(struct super_block *p_s_sb, int jindex) {
+ struct reiserfs_journal_commit_task *ct ;
+ /* using GFP_BUFFER, GFP_KERNEL could try to flush inodes, which will try
+ ** to start/join a transaction, which will deadlock
+ */
+ ct = kmalloc(sizeof(struct reiserfs_journal_commit_task), GFP_BUFFER) ;
+ if (ct) {
+ setup_commit_task_arg(ct, p_s_sb, jindex) ;
+ queue_task(&(ct->task), &reiserfs_commit_thread_tq);
+ wake_up(&reiserfs_commit_thread_wait) ;
+ } else {
+#ifdef CONFIG_REISERFS_CHECK
+ reiserfs_warning("journal-1540: kmalloc failed, doing sync commit\n") ;
+#endif
+ flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1) ;
+ }
+}
+
+/*
+** this is the commit thread. It is started with kernel_thread on
+** FS mount, and journal_release() waits for it to exit.
+**
+** It could do a periodic commit, but there is a lot code for that
+** elsewhere right now, and I only wanted to implement this little
+** piece for starters.
+**
+** All we do here is sleep on the j_commit_thread_wait wait queue, and
+** then run the per filesystem commit task queue when we wakeup.
+*/
+static int reiserfs_journal_commit_thread(void *nullp) {
+ exit_files(current);
+ exit_mm(current);
+
+ spin_lock_irq(¤t->sigmask_lock);
+ sigfillset(¤t->blocked);
+ recalc_sigpending(current);
+ spin_unlock_irq(¤t->sigmask_lock);
+
+ current->session = 1;
+ current->pgrp = 1;
+ sprintf(current->comm, "kreiserfsd") ;
+ lock_kernel() ;
+ while(1) {
+
+ while(TQ_ACTIVE(reiserfs_commit_thread_tq)) {
+ run_task_queue(&reiserfs_commit_thread_tq) ;
+ }
+
+ /* if there aren't any more filesystems left, break */
+ if (reiserfs_mounted_fs_count <= 0) {
+ run_task_queue(&reiserfs_commit_thread_tq) ;
+ break ;
+ }
+ wake_up(&reiserfs_commit_thread_done) ;
+ interruptible_sleep_on_timeout(&reiserfs_commit_thread_wait, 5) ;
+ }
+ unlock_kernel() ;
+ wake_up(&reiserfs_commit_thread_done) ;
+ return 0 ;
+}
+
+static void journal_list_init(struct super_block *p_s_sb) {
+ int i ;
+ for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
+ init_waitqueue_head(&(SB_JOURNAL_LIST(p_s_sb)[i].j_commit_wait)) ;
+ init_waitqueue_head(&(SB_JOURNAL_LIST(p_s_sb)[i].j_flush_wait)) ;
+ }
+}
+
+/*
+** must be called once on fs mount. calls journal_read for you
+*/
+int journal_init(struct super_block *p_s_sb) {
+ int num_cnodes = JOURNAL_BLOCK_COUNT * 2 ;
+
+ if (sizeof(struct reiserfs_journal_commit) != 4096 ||
+ sizeof(struct reiserfs_journal_desc) != 4096
+ ) {
+ printk("journal-1249: commit or desc struct not 4096 %Zd %Zd\n", sizeof(struct reiserfs_journal_commit),
+ sizeof(struct reiserfs_journal_desc)) ;
+ return 1 ;
+ }
+ /* sanity check to make sure they don't overflow the journal */
+ if (JOURNAL_BLOCK_COUNT > reiserfs_get_journal_orig_size(p_s_sb)) {
+ printk("journal-1393: current JOURNAL_BLOCK_COUNT (%d) is too big. This FS was created with a journal size of %lu blocks\n",
+ JOURNAL_BLOCK_COUNT, reiserfs_get_journal_orig_size(p_s_sb)) ;
+ return 1 ;
+ }
+ SB_JOURNAL(p_s_sb) = vmalloc(sizeof (struct reiserfs_journal)) ;
+
+ if (!SB_JOURNAL(p_s_sb)) {
+ printk("journal-1256: unable to get memory for journal structure\n") ;
+ return 1 ;
+ }
+ memset(SB_JOURNAL(p_s_sb), 0, sizeof(struct reiserfs_journal)) ;
+
+ SB_JOURNAL(p_s_sb)->j_list_bitmap_index = 0 ;
+ SB_JOURNAL_LIST_INDEX(p_s_sb) = -10000 ; /* make sure flush_old_commits does not try to flush a list while replay is on */
+
+ /* clear out the journal list array */
+ memset(SB_JOURNAL_LIST(p_s_sb), 0, sizeof(struct reiserfs_journal_list) * JOURNAL_LIST_COUNT) ;
+ journal_list_init(p_s_sb) ;
+
+ memset(SB_JOURNAL(p_s_sb)->j_list_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ;
+ memset(journal_writers, 0, sizeof(char *) * 512) ; /* debug code */
+
+ INIT_LIST_HEAD(&SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ;
+ reiserfs_allocate_list_bitmaps(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap,
+ SB_BMAP_NR(p_s_sb)) ;
+ allocate_bitmap_nodes(p_s_sb) ;
+
+ SB_JOURNAL(p_s_sb)->j_start = 0 ;
+ SB_JOURNAL(p_s_sb)->j_len = 0 ;
+ SB_JOURNAL(p_s_sb)->j_len_alloc = 0 ;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_wcount), 0) ;
+ SB_JOURNAL(p_s_sb)->j_bcount = 0 ;
+ SB_JOURNAL(p_s_sb)->j_trans_start_time = 0 ;
+ SB_JOURNAL(p_s_sb)->j_last = NULL ;
+ SB_JOURNAL(p_s_sb)->j_first = NULL ;
+ init_waitqueue_head(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
+ init_waitqueue_head(&(SB_JOURNAL(p_s_sb)->j_wait)) ;
+
+ SB_JOURNAL(p_s_sb)->j_trans_id = 10 ;
+ SB_JOURNAL(p_s_sb)->j_mount_id = 10 ;
+ SB_JOURNAL(p_s_sb)->j_state = 0 ;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_wlock), 0) ;
+ SB_JOURNAL(p_s_sb)->j_cnode_free_list = allocate_cnodes(num_cnodes) ;
+ SB_JOURNAL(p_s_sb)->j_cnode_free_orig = SB_JOURNAL(p_s_sb)->j_cnode_free_list ;
+ SB_JOURNAL(p_s_sb)->j_cnode_free = SB_JOURNAL(p_s_sb)->j_cnode_free_list ? num_cnodes : 0 ;
+ SB_JOURNAL(p_s_sb)->j_cnode_used = 0 ;
+ SB_JOURNAL(p_s_sb)->j_must_wait = 0 ;
+ init_journal_hash(p_s_sb) ;
+ SB_JOURNAL_LIST(p_s_sb)[0].j_list_bitmap = get_list_bitmap(p_s_sb, SB_JOURNAL_LIST(p_s_sb)) ;
+ if (!(SB_JOURNAL_LIST(p_s_sb)[0].j_list_bitmap)) {
+ reiserfs_warning("journal-2005, get_list_bitmap failed for journal list 0\n") ;
+ return 1 ;
+ }
+ if (journal_read(p_s_sb) < 0) {
+ reiserfs_warning("Replay Failure, unable to mount\n") ;
+ free_journal_ram(p_s_sb) ;
+ return 1 ;
+ }
+ SB_JOURNAL_LIST_INDEX(p_s_sb) = 0 ; /* once the read is done, we can set this where it belongs */
+
+ if (reiserfs_dont_log (p_s_sb))
+ return 0;
+
+ reiserfs_mounted_fs_count++ ;
+ if (reiserfs_mounted_fs_count <= 1) {
+ kernel_thread((void *)(void *)reiserfs_journal_commit_thread, NULL,
+ CLONE_FS | CLONE_FILES | CLONE_VM) ;
+ }
+ return 0 ;
+}
+
+/*
+** test for a polite end of the current transaction. Used by file_write, and should
+** be used by delete to make sure they don't write more than can fit inside a single
+** transaction
+*/
+int journal_transaction_should_end(struct reiserfs_transaction_handle *th, int new_alloc) {
+ time_t now = CURRENT_TIME ;
+ if (reiserfs_dont_log(th->t_super))
+ return 0 ;
+ if ( SB_JOURNAL(th->t_super)->j_must_wait > 0 ||
+ (SB_JOURNAL(th->t_super)->j_len_alloc + new_alloc) >= JOURNAL_MAX_BATCH ||
+ atomic_read(&(SB_JOURNAL(th->t_super)->j_jlock)) ||
+ (now - SB_JOURNAL(th->t_super)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE ||
+ SB_JOURNAL(th->t_super)->j_cnode_free < (JOURNAL_TRANS_MAX * 3)) {
+ return 1 ;
+ }
+ return 0 ;
+}
+
+/* this must be called inside a transaction, and requires the
+** kernel_lock to be held
+*/
+void reiserfs_block_writes(struct reiserfs_transaction_handle *th) {
+ struct super_block *s = th->t_super ;
+ SB_JOURNAL(s)->j_must_wait = 1 ;
+ set_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state) ;
+ return ;
+}
+
+/* this must be called without a transaction started, and does not
+** require BKL
+*/
+void reiserfs_allow_writes(struct super_block *s) {
+ clear_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state) ;
+ wake_up(&SB_JOURNAL(s)->j_join_wait) ;
+}
+
+/* this must be called without a transaction started, and does not
+** require BKL
+*/
+void reiserfs_wait_on_write_block(struct super_block *s) {
+ wait_event(SB_JOURNAL(s)->j_join_wait,
+ !test_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state)) ;
+}
+
+/* join == true if you must join an existing transaction.
+** join == false if you can deal with waiting for others to finish
+**
+** this will block until the transaction is joinable. send the number of blocks you
+** expect to use in nblocks.
+*/
+static int do_journal_begin_r(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb,unsigned long nblocks,int join) {
+ time_t now = CURRENT_TIME ;
+ int old_trans_id ;
+
+ reiserfs_check_lock_depth("journal_begin") ;
+#ifdef CONFIG_REISERFS_CHECK
+ if (p_s_sb->s_flags & MS_RDONLY) {
+ printk("clm-2078: calling journal_begin on readonly FS\n") ;
+ BUG() ;
+ }
+#endif
+
+ if (reiserfs_dont_log(p_s_sb)) {
+ th->t_super = p_s_sb ; /* others will check this for the don't log flag */
+ return 0 ;
+ }
+
+relock:
+ lock_journal(p_s_sb) ;
+
+ if (test_bit(WRITERS_BLOCKED, &SB_JOURNAL(p_s_sb)->j_state)) {
+ unlock_journal(p_s_sb) ;
+ reiserfs_wait_on_write_block(p_s_sb) ;
+ goto relock ;
+ }
+
+ /* if there is no room in the journal OR
+ ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
+ ** we don't sleep if there aren't other writers
+ */
+
+
+ if ( (!join && SB_JOURNAL(p_s_sb)->j_must_wait > 0) ||
+ ( !join && (SB_JOURNAL(p_s_sb)->j_len_alloc + nblocks + 2) >= JOURNAL_MAX_BATCH) ||
+ (!join && atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0 && SB_JOURNAL(p_s_sb)->j_trans_start_time > 0 &&
+ (now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE) ||
+ (!join && atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) ) ||
+ (!join && SB_JOURNAL(p_s_sb)->j_cnode_free < (JOURNAL_TRANS_MAX * 3))) {
+
+ unlock_journal(p_s_sb) ; /* allow others to finish this transaction */
+
+ /* if writer count is 0, we can just force this transaction to end, and start
+ ** a new one afterwards.
+ */
+ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0) {
+ struct reiserfs_transaction_handle myth ;
+ journal_join(&myth, p_s_sb, 1) ;
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ do_journal_end(&myth, p_s_sb,1,COMMIT_NOW) ;
+ } else {
+ /* but if the writer count isn't zero, we have to wait for the current writers to finish.
+ ** They won't batch on transaction end once we set j_jlock
+ */
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 1) ;
+ old_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ;
+ while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) &&
+ SB_JOURNAL(p_s_sb)->j_trans_id == old_trans_id) {
+ sleep_on(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
+ }
+ }
+ lock_journal(p_s_sb) ; /* relock to continue */
+ }
+
+ if (SB_JOURNAL(p_s_sb)->j_trans_start_time == 0) { /* we are the first writer, set trans_id */
+ SB_JOURNAL(p_s_sb)->j_trans_start_time = now ;
+ }
+ atomic_inc(&(SB_JOURNAL(p_s_sb)->j_wcount)) ;
+ SB_JOURNAL(p_s_sb)->j_len_alloc += nblocks ;
+ th->t_blocks_logged = 0 ;
+ th->t_blocks_allocated = nblocks ;
+ th->t_super = p_s_sb ;
+ th->t_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ;
+ th->t_caller = "Unknown" ;
+ unlock_journal(p_s_sb) ;
+ p_s_sb->s_dirt = 1;
+ return 0 ;
+}
+
+
+int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ return do_journal_begin_r(th, p_s_sb, nblocks, 1) ;
+}
+
+int journal_begin(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks) {
+ return do_journal_begin_r(th, p_s_sb, nblocks, 0) ;
+}
+
+/* not used at all */
+int journal_prepare(struct super_block * p_s_sb, struct buffer_head *bh) {
+ return 0 ;
+}
+
+/*
+** puts bh into the current transaction. If it was already there, reorders removes the
+** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
+**
+** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
+** transaction is committed.
+**
+** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
+*/
+int journal_mark_dirty(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, struct buffer_head *bh) {
+ struct reiserfs_journal_cnode *cn = NULL;
+ int count_already_incd = 0 ;
+ int prepared = 0 ;
+
+ if (reiserfs_dont_log(th->t_super)) {
+ mark_buffer_dirty(bh) ;
+ return 0 ;
+ }
+
+ if (th->t_trans_id != SB_JOURNAL(p_s_sb)->j_trans_id) {
+ reiserfs_panic(th->t_super, "journal-1577: handle trans id %d != current trans id %d\n",
+ th->t_trans_id, SB_JOURNAL(p_s_sb)->j_trans_id);
+ }
+ p_s_sb->s_dirt = 1 ;
+
+ prepared = test_and_clear_bit(BH_JPrepared, &bh->b_state) ;
+ /* already in this transaction, we are done */
+ if (buffer_journaled(bh)) {
+ return 0 ;
+ }
+
+ /* this must be turned into a panic instead of a warning. We can't allow
+ ** a dirty or journal_dirty or locked buffer to be logged, as some changes
+ ** could get to disk too early. NOT GOOD.
+ */
+ if (!prepared || buffer_locked(bh)) {
+ printk("journal-1777: buffer %lu bad state %cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT\n", bh->b_blocknr, prepared ? ' ' : '!',
+ buffer_locked(bh) ? ' ' : '!',
+ buffer_dirty(bh) ? ' ' : '!',
+ buffer_journal_dirty(bh) ? ' ' : '!') ;
+ show_reiserfs_locks() ;
+ }
+ count_already_incd = clear_prepared_bits(bh) ;
+
+ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0) {
+ printk("journal-1409: journal_mark_dirty returning because j_wcount was %d\n", atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount))) ;
+ return 1 ;
+ }
+ /* this error means I've screwed up, and we've overflowed the transaction.
+ ** Nothing can be done here, except make the FS readonly or panic.
+ */
+ if (SB_JOURNAL(p_s_sb)->j_len >= JOURNAL_TRANS_MAX) {
+ reiserfs_panic(th->t_super, "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n", SB_JOURNAL(p_s_sb)->j_len) ;
+ }
+
+ if (buffer_journal_dirty(bh)) {
+ count_already_incd = 1 ;
+ mark_buffer_notjournal_dirty(bh) ;
+ }
+
+ if (buffer_dirty(bh)) {
+ clear_bit(BH_Dirty, &bh->b_state) ;
+ }
+
+ if (buffer_journaled(bh)) { /* must double check after getting lock */
+ goto done ;
+ }
+
+ if (SB_JOURNAL(p_s_sb)->j_len > SB_JOURNAL(p_s_sb)->j_len_alloc) {
+ SB_JOURNAL(p_s_sb)->j_len_alloc = SB_JOURNAL(p_s_sb)->j_len + JOURNAL_PER_BALANCE_CNT ;
+ }
+
+ set_bit(BH_JDirty, &bh->b_state) ;
+
+ /* now put this guy on the end */
+ if (!cn) {
+ cn = get_cnode(p_s_sb) ;
+ if (!cn) {
+ reiserfs_panic(p_s_sb, "get_cnode failed!\n");
+ }
+
+ if (th->t_blocks_logged == th->t_blocks_allocated) {
+ th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT ;
+ SB_JOURNAL(p_s_sb)->j_len_alloc += JOURNAL_PER_BALANCE_CNT ;
+ }
+ th->t_blocks_logged++ ;
+ SB_JOURNAL(p_s_sb)->j_len++ ;
+
+ cn->bh = bh ;
+ cn->blocknr = bh->b_blocknr ;
+ cn->dev = bh->b_dev ;
+ cn->jlist = NULL ;
+ insert_journal_hash(SB_JOURNAL(p_s_sb)->j_hash_table, cn) ;
+ if (!count_already_incd) {
+ atomic_inc(&(bh->b_count)) ;
+ }
+ }
+ cn->next = NULL ;
+ cn->prev = SB_JOURNAL(p_s_sb)->j_last ;
+ cn->bh = bh ;
+ if (SB_JOURNAL(p_s_sb)->j_last) {
+ SB_JOURNAL(p_s_sb)->j_last->next = cn ;
+ SB_JOURNAL(p_s_sb)->j_last = cn ;
+ } else {
+ SB_JOURNAL(p_s_sb)->j_first = cn ;
+ SB_JOURNAL(p_s_sb)->j_last = cn ;
+ }
+done:
+ return 0 ;
+}
+
+/*
+** if buffer already in current transaction, do a journal_mark_dirty
+** otherwise, just mark it dirty and move on. Used for writes to meta blocks
+** that don't need journaling
+*/
+int journal_mark_dirty_nolog(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, struct buffer_head *bh) {
+ if (reiserfs_dont_log(th->t_super) || buffer_journaled(bh) ||
+ buffer_journal_dirty(bh)) {
+ return journal_mark_dirty(th, p_s_sb, bh) ;
+ }
+ if (get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, bh->b_dev,bh->b_blocknr,bh->b_size)) {
+ return journal_mark_dirty(th, p_s_sb, bh) ;
+ }
+ mark_buffer_dirty(bh) ;
+ return 0 ;
+}
+
+int journal_end(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ return do_journal_end(th, p_s_sb, nblocks, 0) ;
+}
+
+/* removes from the current transaction, relsing and descrementing any counters.
+** also files the removed buffer directly onto the clean list
+**
+** called by journal_mark_freed when a block has been deleted
+**
+** returns 1 if it cleaned and relsed the buffer. 0 otherwise
+*/
+int remove_from_transaction(struct super_block *p_s_sb, unsigned long blocknr, int already_cleaned) {
+ struct buffer_head *bh ;
+ struct reiserfs_journal_cnode *cn ;
+ int ret = 0;
+
+ cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_hash_table, p_s_sb->s_dev, blocknr, p_s_sb->s_blocksize) ;
+ if (!cn || !cn->bh) {
+ return ret ;
+ }
+ bh = cn->bh ;
+ if (cn->prev) {
+ cn->prev->next = cn->next ;
+ }
+ if (cn->next) {
+ cn->next->prev = cn->prev ;
+ }
+ if (cn == SB_JOURNAL(p_s_sb)->j_first) {
+ SB_JOURNAL(p_s_sb)->j_first = cn->next ;
+ }
+ if (cn == SB_JOURNAL(p_s_sb)->j_last) {
+ SB_JOURNAL(p_s_sb)->j_last = cn->prev ;
+ }
+ remove_journal_hash(SB_JOURNAL(p_s_sb)->j_hash_table, NULL, bh, 0) ;
+ mark_buffer_not_journaled(bh) ; /* don't log this one */
+
+ if (!already_cleaned) {
+ mark_buffer_notjournal_dirty(bh) ;
+ atomic_dec(&(bh->b_count)) ;
+ if (atomic_read(&(bh->b_count)) < 0) {
+ printk("journal-1752: remove from trans, b_count < 0\n") ;
+ }
+ if (!buffer_locked(bh)) reiserfs_clean_and_file_buffer(bh) ;
+ ret = 1 ;
+ }
+ SB_JOURNAL(p_s_sb)->j_len-- ;
+ SB_JOURNAL(p_s_sb)->j_len_alloc-- ;
+ free_cnode(p_s_sb, cn) ;
+ return ret ;
+}
+
+/* removes from a specific journal list hash */
+int remove_from_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, struct buffer_head *bh, int remove_freed) {
+ remove_journal_hash(SB_JOURNAL(s)->j_list_hash_table, jl, bh, remove_freed) ;
+ return 0 ;
+}
+
+/*
+** for any cnode in a journal list, it can only be dirtied of all the
+** transactions that include it are commited to disk.
+** this checks through each transaction, and returns 1 if you are allowed to dirty,
+** and 0 if you aren't
+**
+** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
+** blocks for a given transaction on disk
+**
+*/
+static int can_dirty(struct reiserfs_journal_cnode *cn) {
+ kdev_t dev = cn->dev ;
+ unsigned long blocknr = cn->blocknr ;
+ struct reiserfs_journal_cnode *cur = cn->hprev ;
+ int can_dirty = 1 ;
+
+ /* first test hprev. These are all newer than cn, so any node here
+ ** with the name block number and dev means this node can't be sent
+ ** to disk right now.
+ */
+ while(cur && can_dirty) {
+ if (cur->jlist && cur->bh && cur->blocknr && cur->dev == dev &&
+ cur->blocknr == blocknr) {
+ can_dirty = 0 ;
+ }
+ cur = cur->hprev ;
+ }
+ /* then test hnext. These are all older than cn. As long as they
+ ** are committed to the log, it is safe to write cn to disk
+ */
+ cur = cn->hnext ;
+ while(cur && can_dirty) {
+ if (cur->jlist && cur->jlist->j_len > 0 &&
+ atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh &&
+ cur->blocknr && cur->dev == dev && cur->blocknr == blocknr) {
+ can_dirty = 0 ;
+ }
+ cur = cur->hnext ;
+ }
+ return can_dirty ;
+}
+
+/* syncs the commit blocks, but does not force the real buffers to disk
+** will wait until the current transaction is done/commited before returning
+*/
+int journal_end_sync(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+ return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT) ;
+}
+
+#ifdef __KERNEL__
+int show_reiserfs_locks(void) {
+
+ dump_journal_writers() ;
+#if 0 /* debugging code for when we are compiled static don't delete */
+ p_s_sb = sb_entry(super_blocks.next);
+ while (p_s_sb != sb_entry(&super_blocks)) {
+ if (reiserfs_is_super(p_s_sb)) {
+printk("journal lock is %d, join lock is %d, writers %d must wait is %d\n",
+ atomic_read(&(SB_JOURNAL(p_s_sb)->j_wlock)),
+ atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)),
+ atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)),
+ SB_JOURNAL(p_s_sb)->j_must_wait) ;
+ printk("used cnodes %d, free cnodes %d\n", SB_JOURNAL(p_s_sb)->j_cnode_used, SB_JOURNAL(p_s_sb)->j_cnode_free) ;
+ }
+ p_s_sb = sb_entry(p_s_sb->s_list.next);
+ }
+#endif
+ return 0 ;
+}
+#endif
+
+/*
+** used to get memory back from async commits that are floating around
+** and to reclaim any blocks deleted but unusable because their commits
+** haven't hit disk yet. called from bitmap.c
+**
+** if it starts flushing things, it ors SCHEDULE_OCCURRED into repeat.
+** note, this is just if schedule has a chance of occuring. I need to
+** change flush_commit_lists to have a repeat parameter too.
+**
+*/
+void flush_async_commits(struct super_block *p_s_sb) {
+ int i ;
+
+ for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
+ if (i != SB_JOURNAL_LIST_INDEX(p_s_sb)) {
+ flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + i, 1) ;
+ }
+ }
+}
+
+/*
+** flushes any old transactions to disk
+** ends the current transaction if it is too old
+**
+** also calls flush_journal_list with old_only == 1, which allows me to reclaim
+** memory and such from the journal lists whose real blocks are all on disk.
+**
+** called by sync_dev_journal from buffer.c
+*/
+int flush_old_commits(struct super_block *p_s_sb, int immediate) {
+ int i ;
+ int count = 0;
+ int start ;
+ time_t now ;
+ int keep_dirty = 0 ;
+ struct reiserfs_transaction_handle th ;
+
+ start = SB_JOURNAL_LIST_INDEX(p_s_sb) ;
+ now = CURRENT_TIME ;
+
+ /* safety check so we don't flush while we are replaying the log during mount */
+ if (SB_JOURNAL_LIST_INDEX(p_s_sb) < 0) {
+ return 0 ;
+ }
+ if (!strcmp(current->comm, "kupdate")) {
+ immediate = 0 ;
+ keep_dirty = 1 ;
+ }
+ /* starting with oldest, loop until we get to the start */
+ i = (SB_JOURNAL_LIST_INDEX(p_s_sb) + 1) % JOURNAL_LIST_COUNT ;
+ while(i != start) {
+ if (SB_JOURNAL_LIST(p_s_sb)[i].j_len > 0 && ((now - SB_JOURNAL_LIST(p_s_sb)[i].j_timestamp) > JOURNAL_MAX_COMMIT_AGE ||
+ immediate)) {
+ /* we have to check again to be sure the current transaction did not change */
+ if (i != SB_JOURNAL_LIST_INDEX(p_s_sb)) {
+ flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + i, 1) ;
+ }
+ }
+ i = (i + 1) % JOURNAL_LIST_COUNT ;
+ count++ ;
+ }
+ /* now, check the current transaction. If there are no writers, and it is too old, finish it, and
+ ** force the commit blocks to disk
+ */
+ if (!immediate && atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0 &&
+ SB_JOURNAL(p_s_sb)->j_trans_start_time > 0 &&
+ SB_JOURNAL(p_s_sb)->j_len > 0 &&
+ (now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE) {
+ journal_join(&th, p_s_sb, 1) ;
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ do_journal_end(&th, p_s_sb,1, COMMIT_NOW) ;
+ keep_dirty = 0 ;
+ } else if (immediate) { /* belongs above, but I wanted this to be very explicit as a special case. If they say to
+ flush, we must be sure old transactions hit the disk too. */
+ journal_join(&th, p_s_sb, 1) ;
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ do_journal_end(&th, p_s_sb,1, COMMIT_NOW | WAIT) ;
+ }
+ keep_dirty |= reiserfs_journal_kupdate(p_s_sb) ;
+ return keep_dirty ;
+}
+
+/*
+** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
+**
+** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
+** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
+** flushes the commit list and returns 0.
+**
+** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
+**
+** Note, we can't allow the journal_end to proceed while there are still writers in the log.
+*/
+static int check_journal_end(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb,
+ unsigned long nblocks, int flags) {
+
+ time_t now ;
+ int flush = flags & FLUSH_ALL ;
+ int commit_now = flags & COMMIT_NOW ;
+ int wait_on_commit = flags & WAIT ;
+
+ if (th->t_trans_id != SB_JOURNAL(p_s_sb)->j_trans_id) {
+ reiserfs_panic(th->t_super, "journal-1577: handle trans id %d != current trans id %d\n",
+ th->t_trans_id, SB_JOURNAL(p_s_sb)->j_trans_id);
+ }
+
+ SB_JOURNAL(p_s_sb)->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged) ;
+ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
+ atomic_dec(&(SB_JOURNAL(p_s_sb)->j_wcount)) ;
+ }
+
+ /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
+ ** will be dealt with by next transaction that actually writes something, but should be taken
+ ** care of in this trans
+ */
+ if (SB_JOURNAL(p_s_sb)->j_len == 0) {
+ int wcount = atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) ;
+ unlock_journal(p_s_sb) ;
+ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) > 0 && wcount <= 0) {
+ atomic_dec(&(SB_JOURNAL(p_s_sb)->j_jlock)) ;
+ wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
+ }
+ return 0 ;
+ }
+ /* if wcount > 0, and we are called to with flush or commit_now,
+ ** we wait on j_join_wait. We will wake up when the last writer has
+ ** finished the transaction, and started it on its way to the disk.
+ ** Then, we flush the commit or journal list, and just return 0
+ ** because the rest of journal end was already done for this transaction.
+ */
+ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0) {
+ if (flush || commit_now) {
+ int orig_jindex = SB_JOURNAL_LIST_INDEX(p_s_sb) ;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 1) ;
+ if (flush) {
+ SB_JOURNAL(p_s_sb)->j_next_full_flush = 1 ;
+ }
+ unlock_journal(p_s_sb) ;
+ /* sleep while the current transaction is still j_jlocked */
+ while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) &&
+ SB_JOURNAL(p_s_sb)->j_trans_id == th->t_trans_id) {
+ sleep_on(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
+ }
+ if (commit_now) {
+ if (wait_on_commit) {
+ flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ;
+ } else {
+ commit_flush_async(p_s_sb, orig_jindex) ;
+ }
+ }
+ return 0 ;
+ }
+ unlock_journal(p_s_sb) ;
+ return 0 ;
+ }
+
+ /* deal with old transactions where we are the last writers */
+ now = CURRENT_TIME ;
+ if ((now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE) {
+ commit_now = 1 ;
+ SB_JOURNAL(p_s_sb)->j_next_async_flush = 1 ;
+ }
+ /* don't batch when someone is waiting on j_join_wait */
+ /* don't batch when syncing the commit or flushing the whole trans */
+ if (!(SB_JOURNAL(p_s_sb)->j_must_wait > 0) && !(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock))) && !flush && !commit_now &&
+ (SB_JOURNAL(p_s_sb)->j_len < JOURNAL_MAX_BATCH) &&
+ SB_JOURNAL(p_s_sb)->j_len_alloc < JOURNAL_MAX_BATCH && SB_JOURNAL(p_s_sb)->j_cnode_free > (JOURNAL_TRANS_MAX * 3)) {
+ SB_JOURNAL(p_s_sb)->j_bcount++ ;
+ unlock_journal(p_s_sb) ;
+ return 0 ;
+ }
+
+ if (SB_JOURNAL(p_s_sb)->j_start > JOURNAL_BLOCK_COUNT) {
+ reiserfs_panic(p_s_sb, "journal-003: journal_end: j_start (%d) is too high\n", SB_JOURNAL(p_s_sb)->j_start) ;
+ }
+ return 1 ;
+}
+
+/*
+** Does all the work that makes deleting blocks safe.
+** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
+**
+** otherwise:
+** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
+** before this transaction has finished.
+**
+** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
+** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
+** the block can't be reallocated yet.
+**
+** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
+*/
+int journal_mark_freed(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long blocknr) {
+ struct reiserfs_journal_cnode *cn = NULL ;
+ struct buffer_head *bh = NULL ;
+ struct reiserfs_list_bitmap *jb = NULL ;
+ int cleaned = 0 ;
+
+ if (reiserfs_dont_log(th->t_super)) {
+ bh = get_hash_table(p_s_sb->s_dev, blocknr, p_s_sb->s_blocksize) ;
+ if (bh && buffer_dirty (bh)) {
+ printk ("journal_mark_freed(dont_log): dirty buffer on hash list: %lx %ld\n", bh->b_state, blocknr);
+ BUG ();
+ }
+ brelse (bh);
+ return 0 ;
+ }
+ bh = get_hash_table(p_s_sb->s_dev, blocknr, p_s_sb->s_blocksize) ;
+ /* if it is journal new, we just remove it from this transaction */
+ if (bh && buffer_journal_new(bh)) {
+ clear_prepared_bits(bh) ;
+ cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ;
+ } else {
+ /* set the bit for this block in the journal bitmap for this transaction */
+ jb = SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap ;
+ if (!jb) {
+ reiserfs_panic(p_s_sb, "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n") ;
+ }
+ set_bit_in_list_bitmap(p_s_sb, blocknr, jb) ;
+
+ /* Note, the entire while loop is not allowed to schedule. */
+
+ if (bh) {
+ clear_prepared_bits(bh) ;
+ }
+ cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ;
+
+ /* find all older transactions with this block, make sure they don't try to write it out */
+ cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, p_s_sb->s_dev, blocknr, p_s_sb->s_blocksize) ;
+ while (cn) {
+ if (p_s_sb->s_dev == cn->dev && blocknr == cn->blocknr) {
+ set_bit(BLOCK_FREED, &cn->state) ;
+ if (cn->bh) {
+ if (!cleaned) {
+ /* remove_from_transaction will brelse the buffer if it was
+ ** in the current trans
+ */
+ mark_buffer_notjournal_dirty(cn->bh) ;
+ if (!buffer_locked(cn->bh)) {
+ reiserfs_clean_and_file_buffer(cn->bh) ;
+ }
+ cleaned = 1 ;
+ atomic_dec(&(cn->bh->b_count)) ;
+ if (atomic_read(&(cn->bh->b_count)) < 0) {
+ printk("journal-2138: cn->bh->b_count < 0\n") ;
+ }
+ }
+ if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
+ atomic_dec(&(cn->jlist->j_nonzerolen)) ;
+ }
+ cn->bh = NULL ;
+ }
+ }
+ cn = cn->hnext ;
+ }
+ }
+
+ if (bh) {
+ atomic_dec(&(bh->b_count)) ; /* get_hash incs this */
+ if (atomic_read(&(bh->b_count)) < 0) {
+ printk("journal-2165: bh->b_count < 0\n") ;
+ }
+ }
+ return 0 ;
+}
+
+void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
+ struct buffer_head *bh) {
+ if (reiserfs_dont_log (p_s_sb))
+ return;
+
+ if (!bh) {
+ return ;
+ }
+ clear_bit(BH_JPrepared, &bh->b_state) ;
+}
+
+extern struct tree_balance *cur_tb ;
+/*
+** before we can change a metadata block, we have to make sure it won't
+** be written to disk while we are altering it. So, we must:
+** clean it
+** wait on it.
+**
+*/
+void reiserfs_prepare_for_journal(struct super_block *p_s_sb,
+ struct buffer_head *bh, int wait) {
+ int retry_count = 0 ;
+
+ if (reiserfs_dont_log (p_s_sb))
+ return;
+
+ while(!test_bit(BH_JPrepared, &bh->b_state) ||
+ (wait && buffer_locked(bh))) {
+ if (buffer_journaled(bh)) {
+ set_bit(BH_JPrepared, &bh->b_state) ;
+ return ;
+ }
+ set_bit(BH_JPrepared, &bh->b_state) ;
+ if (wait) {
+#ifdef CONFIG_REISERFS_CHECK
+ if (buffer_locked(bh) && cur_tb != NULL) {
+ printk("reiserfs_prepare_for_journal, waiting while do_balance was running\n") ;
+ BUG() ;
+ }
+#endif
+ wait_on_buffer(bh) ;
+ }
+ retry_count++ ;
+ }
+}
+
+/*
+ * Wait for a page to get unlocked.
+ *
+ * This must be called with the caller "holding" the page,
+ * ie with increased "page->count" so that the page won't
+ * go away during the wait..
+ */
+static void ___reiserfs_wait_on_page(struct reiserfs_page_list *pl)
+{
+ struct task_struct *tsk = current;
+ struct page *page = pl->page ;
+ DECLARE_WAITQUEUE(wait, tsk);
+
+ add_wait_queue(&page->wait, &wait);
+ do {
+ block_sync_page(page);
+ set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+ if (!PageLocked(page) || pl->do_not_lock)
+ break;
+ schedule();
+ } while (PageLocked(page));
+ tsk->state = TASK_RUNNING;
+ remove_wait_queue(&page->wait, &wait);
+}
+
+/*
+ * Get an exclusive lock on the page..
+ * but, every time you get woken up, check the page to make sure
+ * someone hasn't called a journal_begin with it locked.
+ *
+ * the page should always be locked when this returns
+ *
+ * returns 0 if you've got the page locked
+ * returns 1 if it returns because someone else has called journal_begin
+ * with the page locked
+ * this is only useful to the code that flushes pages before a
+ * commit. Do not export this hack. Ever.
+ */
+static int reiserfs_try_lock_page(struct reiserfs_page_list *pl)
+{
+ struct page *page = pl->page ;
+ while (TryLockPage(page)) {
+ if (pl->do_not_lock) {
+ /* the page is locked, but we cannot have it */
+ return 1 ;
+ }
+ ___reiserfs_wait_on_page(pl);
+ }
+ /* we have the page locked */
+ return 0 ;
+}
+
+
+/*
+** This can only be called from do_journal_end.
+** it runs through the list things that need flushing before the
+** transaction can commit, and writes each of them to disk
+**
+*/
+
+static void flush_pages_before_commit(struct reiserfs_transaction_handle *th,
+ struct super_block *p_s_sb) {
+ struct reiserfs_page_list *pl = SB_JOURNAL(p_s_sb)->j_flush_pages ;
+ struct reiserfs_page_list *pl_tmp ;
+ struct buffer_head *bh, *head ;
+ int count = 0 ;
+
+ /* first write each dirty unlocked buffer in the list */
+
+ while(pl) {
+ /* ugly. journal_end can be called from get_block, which has a
+ ** page locked. So, we have to check to see if pl->page is the page
+ ** currently locked by the calling function, and if so, skip the
+ ** lock
+ */
+ if (reiserfs_try_lock_page(pl)) {
+ goto setup_next ;
+ }
+ if (!PageLocked(pl->page)) {
+ BUG() ;
+ }
+ if (pl->page->buffers) {
+ head = pl->page->buffers ;
+ bh = head ;
+ do {
+ if (bh->b_blocknr == pl->blocknr && buffer_dirty(bh) &&
+ !buffer_locked(bh) && buffer_uptodate(bh) ) {
+ ll_rw_block(WRITE, 1, &bh) ;
+ }
+ bh = bh->b_this_page ;
+ } while (bh != head) ;
+ }
+ if (!pl->do_not_lock) {
+ UnlockPage(pl->page) ;
+ }
+setup_next:
+ pl = pl->next ;
+ }
+
+ /* now wait on them */
+
+ pl = SB_JOURNAL(p_s_sb)->j_flush_pages ;
+ while(pl) {
+ if (reiserfs_try_lock_page(pl)) {
+ goto remove_page ;
+ }
+ if (!PageLocked(pl->page)) {
+ BUG() ;
+ }
+ if (pl->page->buffers) {
+ head = pl->page->buffers ;
+ bh = head ;
+ do {
+ if (bh->b_blocknr == pl->blocknr) {
+ count++ ;
+ wait_on_buffer(bh) ;
+ if (!buffer_uptodate(bh)) {
+ reiserfs_panic(p_s_sb, "journal-2443: flush_pages_before_commit, error writing block %lu\n", bh->b_blocknr) ;
+ }
+ }
+ bh = bh->b_this_page ;
+ } while (bh != head) ;
+ }
+ if (!pl->do_not_lock) {
+ UnlockPage(pl->page) ;
+ }
+remove_page:
+ /* we've waited on the I/O, we can remove the page from the
+ ** list, and free our pointer struct to it.
+ */
+ if (pl->prev) {
+ pl->prev->next = pl->next ;
+ }
+ if (pl->next) {
+ pl->next->prev = pl->prev ;
+ }
+ put_page(pl->page) ;
+ pl_tmp = pl ;
+ pl = pl->next ;
+ reiserfs_kfree(pl_tmp, sizeof(struct reiserfs_page_list), p_s_sb) ;
+ }
+ SB_JOURNAL(p_s_sb)->j_flush_pages = NULL ;
+}
+
+/*
+** called when a indirect item is converted back into a tail.
+**
+** The reiserfs part of the inode stores enough information to find
+** our page_list struct in the flush list. We remove it from the list
+** and free the struct.
+**
+** Note, it is possible for this to happen:
+**
+** reiserfs_add_page_to_flush_list(inode)
+** transaction ends, list is flushed
+** reiserfs_remove_page_from_flush_list(inode)
+**
+** This would be bad because the page_list pointer in the inode is not
+** updated when the list is flushed, so we can't know if the pointer is
+** valid. So, in the inode, we also store the transaction id when the
+** page was added. If we are trying to remove something from an old
+** transaction, we just clear out the pointer in the inode and return.
+**
+** Normal case is to use the reiserfs_page_list pointer in the inode to
+** find and remove the page from the flush list.
+*/
+int reiserfs_remove_page_from_flush_list(struct reiserfs_transaction_handle *th,
+ struct inode *inode) {
+ struct reiserfs_page_list *pl ;
+
+ /* was this conversion done in a previous transaction? If so, return */
+ if (inode->u.reiserfs_i.i_conversion_trans_id < th->t_trans_id) {
+ inode->u.reiserfs_i.i_converted_page = NULL ;
+ inode->u.reiserfs_i.i_conversion_trans_id = 0 ;
+ return 0 ;
+ }
+
+ /* remove the page_list struct from the list, release our hold on the
+ ** page, and free the page_list struct
+ */
+ pl = inode->u.reiserfs_i.i_converted_page ;
+ if (pl) {
+ if (pl->next) {
+ pl->next->prev = pl->prev ;
+ }
+ if (pl->prev) {
+ pl->prev->next = pl->next ;
+ }
+ if (SB_JOURNAL(inode->i_sb)->j_flush_pages == pl) {
+ SB_JOURNAL(inode->i_sb)->j_flush_pages = pl->next ;
+ }
+ put_page(pl->page) ;
+ reiserfs_kfree(pl, sizeof(struct reiserfs_page_list), inode->i_sb) ;
+ inode->u.reiserfs_i.i_converted_page = NULL ;
+ inode->u.reiserfs_i.i_conversion_trans_id = 0 ;
+ }
+ return 0 ;
+}
+
+/*
+** Called after a direct to indirect transaction. The unformatted node
+** must be flushed to disk before the transaction commits, otherwise, we
+** risk losing the data from the direct item. This adds the page
+** containing the unformatted node to a list of pages that need flushing.
+**
+** it calls get_page(page), so the page won't disappear until we've
+** flushed or removed it from our list.
+**
+** pointers to the reiserfs_page_list struct are stored in the inode,
+** so this page can be quickly removed from the list after the tail is
+** converted back into a direct item.
+**
+** If we fail to find the memory for the reiserfs_page_list struct, we
+** just sync the page now. Not good, but safe.
+**
+** since this must be called with the page locked, we always set
+** the do_not_lock field in the page_list struct we allocate
+**
+*/
+int reiserfs_add_page_to_flush_list(struct reiserfs_transaction_handle *th,
+ struct inode *inode,
+ struct buffer_head *bh) {
+ struct reiserfs_page_list *new_pl ;
+
+/* debugging use ONLY. Do not define this on data you care about. */
+#ifdef REISERFS_NO_FLUSH_AFTER_CONVERT
+ return 0 ;
+#endif
+
+ get_page(bh->b_page) ;
+ new_pl = reiserfs_kmalloc(sizeof(struct reiserfs_page_list), GFP_BUFFER,
+ inode->i_sb) ;
+ if (!new_pl) {
+ put_page(bh->b_page) ;
+ reiserfs_warning("journal-2480: forced to flush page, out of memory\n") ;
+ ll_rw_block(WRITE, 1, &bh) ;
+ wait_on_buffer(bh) ;
+ if (!buffer_uptodate(bh)) {
+ reiserfs_panic(inode->i_sb, "journal-2484: error writing buffer %lu to disk\n", bh->b_blocknr) ;
+ }
+ inode->u.reiserfs_i.i_converted_page = NULL ;
+ return 0 ;
+ }
+
+ new_pl->page = bh->b_page ;
+ new_pl->do_not_lock = 1 ;
+ new_pl->blocknr = bh->b_blocknr ;
+ new_pl->next = SB_JOURNAL(inode->i_sb)->j_flush_pages;
+ if (new_pl->next) {
+ new_pl->next->prev = new_pl ;
+ }
+ new_pl->prev = NULL ;
+ SB_JOURNAL(inode->i_sb)->j_flush_pages = new_pl ;
+
+ /* if we have numbers from an old transaction, zero the converted
+ ** page, it has already been flushed and freed
+ */
+ if (inode->u.reiserfs_i.i_conversion_trans_id &&
+ inode->u.reiserfs_i.i_conversion_trans_id < th->t_trans_id) {
+ inode->u.reiserfs_i.i_converted_page = NULL ;
+ }
+ if (inode->u.reiserfs_i.i_converted_page) {
+ reiserfs_panic(inode->i_sb, "journal-2501: inode already had a converted page\n") ;
+ }
+ inode->u.reiserfs_i.i_converted_page = new_pl ;
+ inode->u.reiserfs_i.i_conversion_trans_id = th->t_trans_id ;
+ return 0 ;
+}
+
+/*
+** long and ugly. If flush, will not return until all commit
+** blocks and all real buffers in the trans are on disk.
+** If no_async, won't return until all commit blocks are on disk.
+**
+** keep reading, there are comments as you go along
+*/
+static int do_journal_end(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks,
+ int flags) {
+ struct reiserfs_journal_cnode *cn, *next, *jl_cn;
+ struct reiserfs_journal_cnode *last_cn = NULL;
+ struct reiserfs_journal_desc *desc ;
+ struct reiserfs_journal_commit *commit ;
+ struct buffer_head *c_bh ; /* commit bh */
+ struct buffer_head *d_bh ; /* desc bh */
+ int cur_write_start = 0 ; /* start index of current log write */
+ int cur_blocks_left = 0 ; /* number of journal blocks left to write */
+ int old_start ;
+ int i ;
+ int jindex ;
+ int orig_jindex ;
+ int flush = flags & FLUSH_ALL ;
+ int commit_now = flags & COMMIT_NOW ;
+ int wait_on_commit = flags & WAIT ;
+ struct reiserfs_super_block *rs ;
+
+ if (reiserfs_dont_log(th->t_super)) {
+ return 0 ;
+ }
+
+ lock_journal(p_s_sb) ;
+ if (SB_JOURNAL(p_s_sb)->j_next_full_flush) {
+ flags |= FLUSH_ALL ;
+ flush = 1 ;
+ }
+ if (SB_JOURNAL(p_s_sb)->j_next_async_flush) {
+ flags |= COMMIT_NOW ;
+ commit_now = 1 ;
+ }
+
+ /* check_journal_end locks the journal, and unlocks if it does not return 1
+ ** it tells us if we should continue with the journal_end, or just return
+ */
+ if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
+ return 0 ;
+ }
+
+ /* check_journal_end might set these, check again */
+ if (SB_JOURNAL(p_s_sb)->j_next_full_flush) {
+ flush = 1 ;
+ }
+ if (SB_JOURNAL(p_s_sb)->j_next_async_flush) {
+ commit_now = 1 ;
+ }
+ /*
+ ** j must wait means we have to flush the log blocks, and the real blocks for
+ ** this transaction
+ */
+ if (SB_JOURNAL(p_s_sb)->j_must_wait > 0) {
+ flush = 1 ;
+ }
+
+ rs = SB_DISK_SUPER_BLOCK(p_s_sb) ;
+ /* setup description block */
+ d_bh = getblk(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) + SB_JOURNAL(p_s_sb)->j_start, p_s_sb->s_blocksize) ;
+ mark_buffer_uptodate(d_bh, 1) ;
+ desc = (struct reiserfs_journal_desc *)(d_bh)->b_data ;
+ memset(desc, 0, sizeof(struct reiserfs_journal_desc)) ;
+ memcpy(desc->j_magic, JOURNAL_DESC_MAGIC, 8) ;
+ desc->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ;
+
+ /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
+ c_bh = getblk(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) +
+ ((SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL(p_s_sb)->j_len + 1) % JOURNAL_BLOCK_COUNT),
+ p_s_sb->s_blocksize) ;
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
+ memset(commit, 0, sizeof(struct reiserfs_journal_commit)) ;
+ commit->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ;
+ mark_buffer_uptodate(c_bh, 1) ;
+
+ /* init this journal list */
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_older_commits_done), 0) ;
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ;
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_timestamp = SB_JOURNAL(p_s_sb)->j_trans_start_time ;
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_bh = c_bh ;
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_start = SB_JOURNAL(p_s_sb)->j_start ;
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_len = SB_JOURNAL(p_s_sb)->j_len ;
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_nonzerolen), SB_JOURNAL(p_s_sb)->j_len) ;
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_left), SB_JOURNAL(p_s_sb)->j_len + 2);
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_realblock = NULL ;
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 1) ;
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 1) ;
+
+ /* which is faster, locking/unlocking at the start and end of the for
+ ** or locking once per iteration around the insert_journal_hash?
+ ** eitherway, we are write locking insert_journal_hash. The ENTIRE FOR
+ ** LOOP MUST not cause schedule to occur.
+ */
+
+ /* for each real block, add it to the journal list hash,
+ ** copy into real block index array in the commit or desc block
+ */
+ for (i = 0, cn = SB_JOURNAL(p_s_sb)->j_first ; cn ; cn = cn->next, i++) {
+ if (test_bit(BH_JDirty, &cn->bh->b_state) ) {
+ jl_cn = get_cnode(p_s_sb) ;
+ if (!jl_cn) {
+ reiserfs_panic(p_s_sb, "journal-1676, get_cnode returned NULL\n") ;
+ }
+ if (i == 0) {
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_realblock = jl_cn ;
+ }
+ jl_cn->prev = last_cn ;
+ jl_cn->next = NULL ;
+ if (last_cn) {
+ last_cn->next = jl_cn ;
+ }
+ last_cn = jl_cn ;
+ if (cn->bh->b_blocknr >= reiserfs_get_journal_block(p_s_sb) &&
+ cn->bh->b_blocknr < (reiserfs_get_journal_block(p_s_sb) + JOURNAL_BLOCK_COUNT)) {
+ reiserfs_panic(p_s_sb, "journal-2332: Trying to log block %lu, which is a log block\n", cn->bh->b_blocknr) ;
+ }
+ jl_cn->blocknr = cn->bh->b_blocknr ;
+ jl_cn->state = 0 ;
+ jl_cn->dev = cn->bh->b_dev ;
+ jl_cn->bh = cn->bh ;
+ jl_cn->jlist = SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb) ;
+ insert_journal_hash(SB_JOURNAL(p_s_sb)->j_list_hash_table, jl_cn) ;
+ if (i < JOURNAL_TRANS_HALF) {
+ desc->j_realblock[i] = cpu_to_le32(cn->bh->b_blocknr) ;
+ } else {
+ commit->j_realblock[i - JOURNAL_TRANS_HALF] = cpu_to_le32(cn->bh->b_blocknr) ;
+ }
+ } else {
+ i-- ;
+ }
+ }
+
+ desc->j_len = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_len) ;
+ desc->j_mount_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_mount_id) ;
+ desc->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ;
+ commit->j_len = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_len) ;
+
+ /* special check in case all buffers in the journal were marked for not logging */
+ if (SB_JOURNAL(p_s_sb)->j_len == 0) {
+ brelse(d_bh) ;
+ brelse(c_bh) ;
+ unlock_journal(p_s_sb) ;
+printk("journal-2020: do_journal_end: BAD desc->j_len is ZERO\n") ;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ;
+ wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
+ return 0 ;
+ }
+
+ /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
+ cur_write_start = SB_JOURNAL(p_s_sb)->j_start ;
+ cur_blocks_left = SB_JOURNAL(p_s_sb)->j_len ;
+ cn = SB_JOURNAL(p_s_sb)->j_first ;
+ jindex = 1 ; /* start at one so we don't get the desc again */
+ while(cur_blocks_left > 0) {
+ /* copy all the real blocks into log area. dirty log blocks */
+ if (test_bit(BH_JDirty, &cn->bh->b_state)) {
+ struct buffer_head *tmp_bh ;
+ tmp_bh = getblk(p_s_sb->s_dev, reiserfs_get_journal_block(p_s_sb) +
+ ((cur_write_start + jindex) % JOURNAL_BLOCK_COUNT),
+ p_s_sb->s_blocksize) ;
+ mark_buffer_uptodate(tmp_bh, 1) ;
+ memcpy(tmp_bh->b_data, cn->bh->b_data, cn->bh->b_size) ;
+ jindex++ ;
+ } else {
+ /* JDirty cleared sometime during transaction. don't log this one */
+ printk("journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!\n") ;
+ }
+ cn = cn->next ;
+ cur_blocks_left-- ;
+ }
+
+ /* we are done with both the c_bh and d_bh, but
+ ** c_bh must be written after all other commit blocks,
+ ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
+ */
+
+ /* now loop through and mark all buffers from this transaction as JDirty_wait
+ ** clear the JDirty bit, clear BH_JNew too.
+ ** if they weren't JDirty, they weren't logged, just relse them and move on
+ */
+ cn = SB_JOURNAL(p_s_sb)->j_first ;
+ while(cn) {
+ clear_bit(BH_JNew, &(cn->bh->b_state)) ;
+ if (test_bit(BH_JDirty, &(cn->bh->b_state))) {
+ set_bit(BH_JDirty_wait, &(cn->bh->b_state)) ;
+ clear_bit(BH_JDirty, &(cn->bh->b_state)) ;
+ } else {
+ brelse(cn->bh) ;
+ }
+ next = cn->next ;
+ free_cnode(p_s_sb, cn) ;
+ cn = next ;
+ }
+
+ /* unlock the journal list for committing and flushing */
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 0) ;
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 0) ;
+
+ orig_jindex = SB_JOURNAL_LIST_INDEX(p_s_sb) ;
+ jindex = (SB_JOURNAL_LIST_INDEX(p_s_sb) + 1) % JOURNAL_LIST_COUNT ;
+ SB_JOURNAL_LIST_INDEX(p_s_sb) = jindex ;
+
+ /* make sure to flush any data converted from direct items to
+ ** indirect items before allowing the commit blocks to reach the
+ ** disk
+ */
+ flush_pages_before_commit(th, p_s_sb) ;
+
+ /* honor the flush and async wishes from the caller */
+ if (flush) {
+
+ flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ;
+ flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex , 1) ;
+ } else if (commit_now) {
+ if (wait_on_commit) {
+ flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ;
+ } else {
+ commit_flush_async(p_s_sb, orig_jindex) ;
+ }
+ }
+
+ /* reset journal values for the next transaction */
+ old_start = SB_JOURNAL(p_s_sb)->j_start ;
+ SB_JOURNAL(p_s_sb)->j_start = (SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL(p_s_sb)->j_len + 2) % JOURNAL_BLOCK_COUNT;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_wcount), 0) ;
+ SB_JOURNAL(p_s_sb)->j_bcount = 0 ;
+ SB_JOURNAL(p_s_sb)->j_last = NULL ;
+ SB_JOURNAL(p_s_sb)->j_first = NULL ;
+ SB_JOURNAL(p_s_sb)->j_len = 0 ;
+ SB_JOURNAL(p_s_sb)->j_trans_start_time = 0 ;
+ SB_JOURNAL(p_s_sb)->j_trans_id++ ;
+ SB_JOURNAL(p_s_sb)->j_must_wait = 0 ;
+ SB_JOURNAL(p_s_sb)->j_len_alloc = 0 ;
+ SB_JOURNAL(p_s_sb)->j_next_full_flush = 0 ;
+ SB_JOURNAL(p_s_sb)->j_next_async_flush = 0 ;
+ init_journal_hash(p_s_sb) ;
+
+ /* if the next transaction has any chance of wrapping, flush
+ ** transactions that might get overwritten. If any journal lists are very
+ ** old flush them as well.
+ */
+ for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
+ jindex = i ;
+ if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 && SB_JOURNAL(p_s_sb)->j_start <= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) {
+ if ((SB_JOURNAL(p_s_sb)->j_start + JOURNAL_TRANS_MAX + 1) >= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) {
+ flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1) ;
+ }
+ } else if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 &&
+ (SB_JOURNAL(p_s_sb)->j_start + JOURNAL_TRANS_MAX + 1) > JOURNAL_BLOCK_COUNT) {
+ if (((SB_JOURNAL(p_s_sb)->j_start + JOURNAL_TRANS_MAX + 1) % JOURNAL_BLOCK_COUNT) >=
+ SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) {
+ flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1 ) ;
+ }
+ }
+ /* this check should always be run, to send old lists to disk */
+ if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 &&
+ SB_JOURNAL_LIST(p_s_sb)[jindex].j_timestamp <
+ (CURRENT_TIME - (JOURNAL_MAX_TRANS_AGE * 4))) {
+ flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1 ) ;
+ }
+ }
+
+ /* if the next journal_list is still in use, flush it */
+ if (SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_len != 0) {
+ flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb), 1) ;
+ }
+
+ /* we don't want anyone flushing the new transaction's list */
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 1) ;
+ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 1) ;
+ SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap = get_list_bitmap(p_s_sb, SB_JOURNAL_LIST(p_s_sb) +
+ SB_JOURNAL_LIST_INDEX(p_s_sb)) ;
+
+ if (!(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap)) {
+ reiserfs_panic(p_s_sb, "journal-1996: do_journal_end, could not get a list bitmap\n") ;
+ }
+ unlock_journal(p_s_sb) ;
+ atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ;
+ /* wake up any body waiting to join. */
+ wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
+ return 0 ;
+}
+
+
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)