patch-2.1.112 linux/fs/ufs/util.h

• Lines: 323
• Date: Sun Jul 26 01:20:22 1998
• Orig file: v2.1.111/linux/fs/ufs/util.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.111/linux/fs/ufs/util.h linux/fs/ufs/util.h
@@ -0,0 +1,322 @@
+/*
+ *  linux/fs/ufs/util.h
+ *
+ * Copyright (C) 1998 
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ */
+
+#include <linux/fs.h>
+#include "swab.h"
+
+
+/*
+ * some usefull marcos
+ */
+#define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))
+#define howmany(x,y)		(((x)+(y)-1)/(y))
+#define min(x,y)		((x)<(y)?(x):(y))
+#define max(x,y)		((x)>(y)?(x):(y))
+
+
+/*
+ * current filesystem state; method depends on flags
+ */
+#define ufs_state(usb3) \
+	(((flags & UFS_ST_MASK) == UFS_ST_OLD) \
+	? (usb3)->fs_u.fs_sun.fs_state /* old normal way */ \
+	: (usb3)->fs_u.fs_44.fs_state /* 4.4BSD way */)
+
+/*
+ * namlen, it's format depends of flags
+ */
+#define ufs_namlen(de) _ufs_namlen_(de,flags,swab)
+static inline __u16 _ufs_namlen_(struct ufs_dir_entry * de, unsigned flags, unsigned swab) {
+	if ((flags & UFS_DE_MASK) == UFS_DE_OLD) {
+		return SWAB16(de->d_u.d_namlen);
+	} else /* UFS_DE_44BSD */ {
+		return de->d_u.d_44.d_namlen;
+	}
+}
+
+/*
+ * Here is how the uid is computed:
+ * if the file system is 4.2BSD, get it from oldids.
+ * if it has sun extension and oldids is USEEFT, get it from ui_sun.
+ * if it is 4.4 or Hurd, get it from ui_44 (which is the same as ui_hurd).
+ */
+#define ufs_uid(inode) _ufs_uid_(inode,flags,swab)
+static inline __u32 _ufs_uid_(struct ufs_inode * inode, unsigned flags, unsigned swab) {
+	switch (flags & UFS_UID_MASK) {
+		case UFS_UID_EFT:
+			return SWAB32(inode->ui_u3.ui_sun.ui_uid);
+		case UFS_UID_44BSD:
+			return SWAB32(inode->ui_u3.ui_44.ui_uid);
+		case UFS_UID_OLD:
+		default:
+			return SWAB16(inode->ui_u1.oldids.ui_suid);
+	}
+}
+
+#define ufs_gid(inode) _ufs_gid_(inode,flags,swab)
+static inline __u32 _ufs_gid_(struct ufs_inode * inode, unsigned flags, unsigned swab) {
+	switch (flags & UFS_UID_MASK) {
+		case UFS_UID_EFT:
+			return SWAB32(inode->ui_u3.ui_sun.ui_gid);
+		case UFS_UID_44BSD:
+			return SWAB32(inode->ui_u3.ui_44.ui_gid);
+		case UFS_UID_OLD:
+		default:
+			return SWAB16(inode->ui_u1.oldids.ui_sgid);
+	}
+}
+
+/*
+ * marcros used for retyping
+ */
+#define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
+#define USPI_UBH ((struct ufs_buffer_head *)uspi)
+
+/*
+ * This functions manipulate with ufs_buffers
+ */
+#define ubh_bread(dev,fragment,size) _ubh_bread_(uspi,dev,fragment,size)  
+extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, kdev_t, unsigned, unsigned);
+#define ubh_bread2(dev,fragment,size) _ubh_bread2_(uspi,dev,fragment,size)  
+extern struct ufs_buffer_head * _ubh_bread2_(struct ufs_sb_private_info *, kdev_t, unsigned, unsigned);
+extern void ubh_brelse (struct ufs_buffer_head *);
+extern void ubh_brelse2 (struct ufs_buffer_head *);
+extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *, int);
+extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
+extern void ubh_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
+extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
+extern unsigned ubh_max_bcount (struct ufs_buffer_head *);
+extern void ubh_bforget (struct ufs_buffer_head *);
+extern int  ubh_buffer_dirty (struct ufs_buffer_head *);
+#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
+extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
+#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
+extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
+
+/*
+ * macros to get important structures from ufs_buffer_head
+ */
+#define ubh_get_usb_first(ubh) \
+	((struct ufs_super_block_first *)((ubh)->bh[0]->b_data))
+
+#define ubh_get_usb_second(ubh) \
+	((struct ufs_super_block_second *)(ubh)-> \
+	bh[SECTOR_SIZE >> uspi->s_fshift]->b_data + (SECTOR_SIZE & ~uspi->s_fmask))
+
+#define ubh_get_usb_third(ubh) \
+	((struct ufs_super_block_third *)((ubh)-> \
+	bh[SECTOR_SIZE*2 >> uspi->s_fshift]->b_data + (SECTOR_SIZE*2 & ~uspi->s_fmask)))
+
+#define ubh_get_ucg(ubh) \
+	((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
+
+/*
+ * Extract byte from ufs_buffer_head
+ * Extract the bits for a block from a map inside ufs_buffer_head
+ */
+#define ubh_get_addr8(ubh,begin) \
+	((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + ((begin) & ~uspi->s_fmask))
+
+#define ubh_get_addr16(ubh,begin) \
+	(((u16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + ((begin) & (uspi->fsize>>1) - 1)))
+
+#define ubh_get_addr32(ubh,begin) \
+	(((u32*)((ubh)->bh[(begin) >> (BLOCK_SIZE_BITS-2)]->b_data)) + \
+	((begin) & ((BLOCK_SIZE>>2) - 1)))
+
+#define ubh_get_addr ubh_get_addr8
+
+#define ubh_blkmap(ubh,begin,bit) \
+	((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
+
+/*
+ * Macros for access to superblock array structures
+ */
+#define ubh_postbl(ubh,cylno,i) \
+	((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
+	? (*(__s16*)(ubh_get_addr(ubh, \
+	(unsigned)(&((struct ufs_super_block *)0)->fs_opostbl) \
+	+ (((cylno) * 16 + (i)) << 1) ) )) \
+	: (*(__s16*)(ubh_get_addr(ubh, \
+	uspi->s_postbloff + (((cylno) * uspi->s_nrpos + (i)) << 1) ))))
+
+#define ubh_rotbl(ubh,i) \
+	((uspi->s_postblformat != UFS_DYNAMICPOSTBLFMT) \
+	? (*(__u8*)(ubh_get_addr(ubh, \
+	(unsigned)(&((struct ufs_super_block *)0)->fs_space) + (i)))) \
+	: (*(__u8*)(ubh_get_addr(ubh, uspi->s_rotbloff + (i)))))
+
+/*
+ * Determine the number of available frags given a
+ * percentage to hold in reserve.
+ */
+#define ufs_freespace(usb, percentreserved) \
+	(ufs_blkstofrags(SWAB32((usb)->fs_cstotal.cs_nbfree)) + \
+	SWAB32((usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
+
+/*
+ * Macros for access to cylinder group array structures
+ */
+#define ubh_cg_blktot(ucpi,cylno) \
+	(*((__u32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
+
+#define ubh_cg_blks(ucpi,cylno,rpos) \
+	(*((__u16*)ubh_get_addr(UCPI_UBH, \
+	(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
+
+/*
+ * Bitmap operation
+ * This functions work like classical bitmap operations. The diference 
+ * is that we havn't the whole bitmap in one continuous part of memory,
+ * but in a few buffers.
+ * The parameter of each function is super_block, ufs_buffer_head and
+ * position of the begining of the bitmap.
+ */
+#define ubh_setbit(ubh,begin,bit) \
+	(*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
+
+#define ubh_clrbit(ubh,begin,bit) \
+	(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
+
+#define ubh_isset(ubh,begin,bit) \
+	(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
+
+#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
+
+#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
+#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
+static inline unsigned _ubh_find_next_zero_bit_(
+	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
+	unsigned begin, unsigned size, unsigned offset)
+{
+	unsigned base, rest;
+
+	begin <<= 3;
+	size += begin;
+	offset += begin;
+	base = offset >> (uspi->s_fshift + 3);
+	offset &= ((uspi->s_fsize << 3) - 1);
+	for (;;) {
+		rest = min (size, uspi->s_fsize << 3);
+		size -= rest;
+		offset = ext2_find_next_zero_bit (ubh->bh[base]->b_data, rest, offset);
+		if (offset < rest || !size)
+			break;
+		base++;
+		offset = 0;
+	}
+	return (base << (uspi->s_fshift + 3)) + offset - begin;
+} 	
+
+#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
+#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
+static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
+	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
+{
+	switch (uspi->s_fpb) {
+	case 8:
+	    	return (*ubh_get_addr (ubh, begin + block) == 0xff);
+	case 4:
+		return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
+	case 2:
+		return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
+	case 1:
+		return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
+	}
+	return 0;	
+}
+
+#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
+static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
+	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
+{
+	switch (uspi->s_fpb) {
+	case 8:
+	    	*ubh_get_addr (ubh, begin + block) = 0x00;
+	    	return; 
+	case 4:
+		*ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
+		return;
+	case 2:
+		*ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
+		return;
+	case 1:
+		*ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
+		return;
+	}
+}
+
+#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
+static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
+	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
+{
+	switch (uspi->s_fpb) {
+	case 8:
+	    	*ubh_get_addr(ubh, begin + block) = 0xff;
+	    	return;
+	case 4:
+		*ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
+		return;
+	case 2:
+		*ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
+		return;
+	case 1:
+		*ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
+		return;
+	}
+}
+
+static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
+	unsigned * fraglist, int cnt)
+{
+	struct ufs_sb_private_info * uspi;
+	unsigned fragsize, pos;
+	unsigned swab;
+	
+	swab = sb->u.ufs_sb.s_swab;
+	uspi = sb->u.ufs_sb.s_uspi;
+	
+	fragsize = 0;
+	for (pos = 0; pos < uspi->s_fpb; pos++) {
+		if (blockmap & (1 << pos)) {
+			fragsize++;
+		}
+		else if (fragsize > 0) {
+			ADD_SWAB32(fraglist[fragsize], cnt);
+			fragsize = 0;
+		}
+	}
+	if (fragsize > 0 && fragsize < uspi->s_fpb)
+		ADD_SWAB32(fraglist[fragsize], cnt);
+}
+
+#define ubh_scanc(ubh,begin,size,table,mask) _ubh_scanc_(uspi,ubh,begin,size,table,mask)
+static inline unsigned _ubh_scanc_(struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh, 
+	unsigned begin, unsigned size, unsigned char * table, unsigned char mask)
+{
+	unsigned rest, offset;
+	unsigned char * cp;
+	
+
+	offset = begin & ~uspi->s_fmask;
+	begin >>= uspi->s_fshift;
+	for (;;) {
+		if ((offset + size) < uspi->s_fsize)
+			rest = size;
+		else
+			rest = uspi->s_fsize - offset;
+		size -= rest;
+		cp = ubh->bh[begin]->b_data + offset;
+		while ((table[*cp++] & mask) == 0 && --rest);
+		if (rest || !size)
+			break;
+		begin++;
+		offset = 0;
+	}
+	return (size + rest);
+}