1 files changed, 526 insertions, 0 deletions

diff --git a/fs/ufs/util.h b/fs/ufs/util.h
new file mode 100644
index 000000000000..b2640076679a
--- /dev/null
+++ b/fs/ufs/util.h
@@ -0,0 +1,526 @@
+/*
+ *  linux/fs/ufs/util.h
+ *
+ * Copyright (C) 1998 
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include "swab.h"
+
+
+/*
+ * some useful macros
+ */
+#define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))
+
+/*
+ * macros used for retyping
+ */
+#define UCPI_UBH ((struct ufs_buffer_head *)ucpi)
+#define USPI_UBH ((struct ufs_buffer_head *)uspi)
+
+
+
+/*
+ * macros used for accessing structures
+ */
+static inline s32
+ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
+		 struct ufs_super_block_third *usb3)
+{
+	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUN:
+		return fs32_to_cpu(sb, usb3->fs_u2.fs_sun.fs_state);
+	case UFS_ST_SUNx86:
+		return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
+	case UFS_ST_44BSD:
+	default:
+		return fs32_to_cpu(sb, usb3->fs_u2.fs_44.fs_state);
+	}
+}
+
+static inline void
+ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
+		 struct ufs_super_block_third *usb3, s32 value)
+{
+	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUN:
+		usb3->fs_u2.fs_sun.fs_state = cpu_to_fs32(sb, value);
+		break;
+	case UFS_ST_SUNx86:
+		usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
+		break;
+	case UFS_ST_44BSD:
+		usb3->fs_u2.fs_44.fs_state = cpu_to_fs32(sb, value);
+		break;
+	}
+}
+
+static inline u32
+ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
+		  struct ufs_super_block_third *usb3)
+{
+	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
+		return fs32_to_cpu(sb, usb3->fs_u2.fs_sunx86.fs_npsect);
+	else
+		return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
+}
+
+static inline u64
+ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
+{
+	__fs64 tmp;
+
+	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUN:
+		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
+		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
+		break;
+	case UFS_ST_SUNx86:
+		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
+		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
+		break;
+	case UFS_ST_44BSD:
+		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
+		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qbmask[1];
+		break;
+	}
+
+	return fs64_to_cpu(sb, tmp);
+}
+
+static inline u64
+ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
+{
+	__fs64 tmp;
+
+	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUN:
+		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
+		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
+		break;
+	case UFS_ST_SUNx86:
+		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
+		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
+		break;
+	case UFS_ST_44BSD:
+		((__fs32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
+		((__fs32 *)&tmp)[1] = usb3->fs_u2.fs_44.fs_qfmask[1];
+		break;
+	}
+
+	return fs64_to_cpu(sb, tmp);
+}
+
+static inline u16
+ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
+{
+	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
+		return fs16_to_cpu(sb, de->d_u.d_namlen);
+	else
+		return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
+}
+
+static inline void
+ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
+{
+	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
+		de->d_u.d_namlen = cpu_to_fs16(sb, value);
+	else
+		de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
+}
+
+static inline void
+ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
+{
+	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
+		return;
+
+	/*
+	 * TODO turn this into a table lookup
+	 */
+	switch (mode & S_IFMT) {
+	case S_IFSOCK:
+		de->d_u.d_44.d_type = DT_SOCK;
+		break;
+	case S_IFLNK:
+		de->d_u.d_44.d_type = DT_LNK;
+		break;
+	case S_IFREG:
+		de->d_u.d_44.d_type = DT_REG;
+		break;
+	case S_IFBLK:
+		de->d_u.d_44.d_type = DT_BLK;
+		break;
+	case S_IFDIR:
+		de->d_u.d_44.d_type = DT_DIR;
+		break;
+	case S_IFCHR:
+		de->d_u.d_44.d_type = DT_CHR;
+		break;
+	case S_IFIFO:
+		de->d_u.d_44.d_type = DT_FIFO;
+		break;
+	default:
+		de->d_u.d_44.d_type = DT_UNKNOWN;
+	}
+}
+
+static inline u32
+ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
+{
+	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
+	case UFS_UID_EFT:
+		return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
+	case UFS_UID_44BSD:
+		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
+	default:
+		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
+	}
+}
+
+static inline void
+ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
+{
+	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
+	case UFS_UID_EFT:
+		inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
+		break;
+	case UFS_UID_44BSD:
+		inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
+		break;
+	}
+	inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value); 
+}
+
+static inline u32
+ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
+{
+	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
+	case UFS_UID_EFT:
+		return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
+	case UFS_UID_44BSD:
+		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
+	default:
+		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
+	}
+}
+
+static inline void
+ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
+{
+	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
+	case UFS_UID_EFT:
+		inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
+		break;
+	case UFS_UID_44BSD:
+		inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
+		break;
+	}
+	inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
+}
+
+extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
+extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
+
+/*
+ * These functions manipulate ufs buffers
+ */
+#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)  
+extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
+extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
+extern void ubh_brelse (struct ufs_buffer_head *);
+extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
+extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
+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[UFS_SECTOR_SIZE >> uspi->s_fshift]->b_data + (UFS_SECTOR_SIZE & ~uspi->s_fmask))
+
+#define ubh_get_usb_third(ubh) \
+	((struct ufs_super_block_third *)((ubh)-> \
+	bh[UFS_SECTOR_SIZE*2 >> uspi->s_fshift]->b_data + (UFS_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) \
+	(((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
+	((begin) & (uspi->fsize>>1) - 1)))
+
+#define ubh_get_addr32(ubh,begin) \
+	(((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
+	((begin) & ((uspi->s_fsize>>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(fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nbfree)) + \
+	fs32_to_cpu(sb, (usb)->fs_cstotal.cs_nffree) - (uspi->s_dsize * (percentreserved) / 100))
+
+/*
+ * Macros to access cylinder group array structures
+ */
+#define ubh_cg_blktot(ucpi,cylno) \
+	(*((__fs32*)ubh_get_addr(UCPI_UBH, (ucpi)->c_btotoff + ((cylno) << 2))))
+
+#define ubh_cg_blks(ucpi,cylno,rpos) \
+	(*((__fs16*)ubh_get_addr(UCPI_UBH, \
+	(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
+
+/*
+ * Bitmap operations
+ * These functions work like classical bitmap operations.
+ * The difference is that we don't have the whole bitmap
+ * in one contiguous chunk of memory, but in several buffers.
+ * The parameters of each function are super_block, ufs_buffer_head and
+ * position of the beginning 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, count, pos;
+
+	size -= offset;
+	begin <<= 3;
+	offset += begin;
+	base = offset >> uspi->s_bpfshift;
+	offset &= uspi->s_bpfmask;
+	for (;;) {
+		count = min_t(unsigned int, size + offset, uspi->s_bpf);
+		size -= count - offset;
+		pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
+		if (pos < count || !size)
+			break;
+		base++;
+		offset = 0;
+	}
+	return (base << uspi->s_bpfshift) + pos - begin;
+} 	
+
+static inline unsigned find_last_zero_bit (unsigned char * bitmap,
+	unsigned size, unsigned offset)
+{
+	unsigned bit, i;
+	unsigned char * mapp;
+	unsigned char map;
+
+	mapp = bitmap + (size >> 3);
+	map = *mapp--;
+	bit = 1 << (size & 7);
+	for (i = size; i > offset; i--) {
+		if ((map & bit) == 0)
+			break;
+		if ((i & 7) != 0) {
+			bit >>= 1;
+		} else {
+			map = *mapp--;
+			bit = 1 << 7;
+		}
+	}
+	return i;
+}
+
+#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
+static inline unsigned _ubh_find_last_zero_bit_(
+	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
+	unsigned begin, unsigned start, unsigned end)
+{
+	unsigned base, count, pos, size;
+
+	size = start - end;
+	begin <<= 3;
+	start += begin;
+	base = start >> uspi->s_bpfshift;
+	start &= uspi->s_bpfmask;
+	for (;;) {
+		count = min_t(unsigned int,
+			    size + (uspi->s_bpf - start), uspi->s_bpf)
+			- (uspi->s_bpf - start);
+		size -= count;
+		pos = find_last_zero_bit (ubh->bh[base]->b_data,
+			start, start - count);
+		if (pos > start - count || !size)
+			break;
+		base--;
+		start = uspi->s_bpf;
+	}
+	return (base << uspi->s_bpfshift) + pos - 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,
+	__fs32 * fraglist, int cnt)
+{
+	struct ufs_sb_private_info * uspi;
+	unsigned fragsize, pos;
+	
+	uspi = UFS_SB(sb)->s_uspi;
+	
+	fragsize = 0;
+	for (pos = 0; pos < uspi->s_fpb; pos++) {
+		if (blockmap & (1 << pos)) {
+			fragsize++;
+		}
+		else if (fragsize > 0) {
+			fs32_add(sb, &fraglist[fragsize], cnt);
+			fragsize = 0;
+		}
+	}
+	if (fragsize > 0 && fragsize < uspi->s_fpb)
+		fs32_add(sb, &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);
+}