util.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:15k
- /*
- * 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 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 accesing 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 (sb->u.ufs_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 (sb->u.ufs_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 ((sb->u.ufs_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)
- {
- u64 tmp;
- switch (sb->u.ufs_sb.s_flags & UFS_ST_MASK) {
- case UFS_ST_SUN:
- ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qbmask[0];
- ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qbmask[1];
- break;
- case UFS_ST_SUNx86:
- ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qbmask[0];
- ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qbmask[1];
- break;
- case UFS_ST_44BSD:
- ((u32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qbmask[0];
- ((u32 *)&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)
- {
- u64 tmp;
- switch (sb->u.ufs_sb.s_flags & UFS_ST_MASK) {
- case UFS_ST_SUN:
- ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sun.fs_qfmask[0];
- ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sun.fs_qfmask[1];
- break;
- case UFS_ST_SUNx86:
- ((u32 *)&tmp)[0] = usb3->fs_u2.fs_sunx86.fs_qfmask[0];
- ((u32 *)&tmp)[1] = usb3->fs_u2.fs_sunx86.fs_qfmask[1];
- break;
- case UFS_ST_44BSD:
- ((u32 *)&tmp)[0] = usb3->fs_u2.fs_44.fs_qfmask[0];
- ((u32 *)&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 ((sb->u.ufs_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 ((sb->u.ufs_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 ((sb->u.ufs_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 (sb->u.ufs_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 (sb->u.ufs_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 (sb->u.ufs_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 (sb->u.ufs_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);
- }
- /*
- * 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 *, unsigned, unsigned);
- extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, unsigned, unsigned);
- 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)
- (((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) >> (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)
- (*((__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 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,
- unsigned * fraglist, int cnt)
- {
- struct ufs_sb_private_info * uspi;
- unsigned fragsize, pos;
-
- 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) {
- 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);
- }