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);
+}