balloc.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:24k
- /*
- * linux/fs/ufs/balloc.c
- *
- * Copyright (C) 1998
- * Daniel Pirkl <daniel.pirkl@email.cz>
- * Charles University, Faculty of Mathematics and Physics
- */
- #include <linux/fs.h>
- #include <linux/ufs_fs.h>
- #include <linux/stat.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/locks.h>
- #include <linux/quotaops.h>
- #include <asm/bitops.h>
- #include <asm/byteorder.h>
- #include "swab.h"
- #include "util.h"
- #undef UFS_BALLOC_DEBUG
- #ifdef UFS_BALLOC_DEBUG
- #define UFSD(x) printk("(%s, %d), %s:", __FILE__, __LINE__, __FUNCTION__); printk x;
- #else
- #define UFSD(x)
- #endif
- unsigned ufs_add_fragments (struct inode *, unsigned, unsigned, unsigned, int *);
- unsigned ufs_alloc_fragments (struct inode *, unsigned, unsigned, unsigned, int *);
- unsigned ufs_alloccg_block (struct inode *, struct ufs_cg_private_info *, unsigned, int *);
- unsigned ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, unsigned, unsigned);
- static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[];
- void ufs_clusteracct(struct super_block *, struct ufs_cg_private_info *, unsigned, int);
- /*
- * Free 'count' fragments from fragment number 'fragment'
- */
- void ufs_free_fragments (struct inode * inode, unsigned fragment, unsigned count) {
- struct super_block * sb;
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct ufs_cg_private_info * ucpi;
- struct ufs_cylinder_group * ucg;
- unsigned cgno, bit, end_bit, bbase, blkmap, i, blkno, cylno;
-
- sb = inode->i_sb;
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first(USPI_UBH);
-
- UFSD(("ENTER, fragment %u, count %un", fragment, count))
-
- if (ufs_fragnum(fragment) + count > uspi->s_fpg)
- ufs_error (sb, "ufs_free_fragments", "internal error");
-
- lock_super(sb);
-
- cgno = ufs_dtog(fragment);
- bit = ufs_dtogd(fragment);
- if (cgno >= uspi->s_ncg) {
- ufs_panic (sb, "ufs_free_fragments", "freeing blocks are outside device");
- goto failed;
- }
-
- ucpi = ufs_load_cylinder (sb, cgno);
- if (!ucpi)
- goto failed;
- ucg = ubh_get_ucg (UCPI_UBH);
- if (!ufs_cg_chkmagic(sb, ucg)) {
- ufs_panic (sb, "ufs_free_fragments", "internal error, bad magic number on cg %u", cgno);
- goto failed;
- }
- end_bit = bit + count;
- bbase = ufs_blknum (bit);
- blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase);
- ufs_fragacct (sb, blkmap, ucg->cg_frsum, -1);
- for (i = bit; i < end_bit; i++) {
- if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, i))
- ubh_setbit (UCPI_UBH, ucpi->c_freeoff, i);
- else ufs_error (sb, "ufs_free_fragments",
- "bit already cleared for fragment %u", i);
- }
-
- DQUOT_FREE_BLOCK (inode, count);
-
- fs32_add(sb, &ucg->cg_cs.cs_nffree, count);
- fs32_add(sb, &usb1->fs_cstotal.cs_nffree, count);
- fs32_add(sb, &sb->fs_cs(cgno).cs_nffree, count);
- blkmap = ubh_blkmap (UCPI_UBH, ucpi->c_freeoff, bbase);
- ufs_fragacct(sb, blkmap, ucg->cg_frsum, 1);
- /*
- * Trying to reassemble free fragments into block
- */
- blkno = ufs_fragstoblks (bbase);
- if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) {
- fs32_sub(sb, &ucg->cg_cs.cs_nffree, uspi->s_fpb);
- fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, uspi->s_fpb);
- fs32_sub(sb, &sb->fs_cs(cgno).cs_nffree, uspi->s_fpb);
- if ((sb->u.ufs_sb.s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
- ufs_clusteracct (sb, ucpi, blkno, 1);
- fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1);
- fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1);
- fs32_add(sb, &sb->fs_cs(cgno).cs_nbfree, 1);
- cylno = ufs_cbtocylno (bbase);
- fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(bbase)), 1);
- fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1);
- }
-
- ubh_mark_buffer_dirty (USPI_UBH);
- ubh_mark_buffer_dirty (UCPI_UBH);
- if (sb->s_flags & MS_SYNCHRONOUS) {
- ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi);
- ubh_wait_on_buffer (UCPI_UBH);
- }
- sb->s_dirt = 1;
-
- unlock_super (sb);
- UFSD(("EXITn"))
- return;
- failed:
- unlock_super (sb);
- UFSD(("EXIT (FAILED)n"))
- return;
- }
- /*
- * Free 'count' fragments from fragment number 'fragment' (free whole blocks)
- */
- void ufs_free_blocks (struct inode * inode, unsigned fragment, unsigned count) {
- struct super_block * sb;
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct ufs_cg_private_info * ucpi;
- struct ufs_cylinder_group * ucg;
- unsigned overflow, cgno, bit, end_bit, blkno, i, cylno;
-
- sb = inode->i_sb;
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first(USPI_UBH);
- UFSD(("ENTER, fragment %u, count %un", fragment, count))
-
- if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) {
- ufs_error (sb, "ufs_free_blocks", "internal error, "
- "fragment %u, count %un", fragment, count);
- goto failed;
- }
- lock_super(sb);
-
- do_more:
- overflow = 0;
- cgno = ufs_dtog (fragment);
- bit = ufs_dtogd (fragment);
- if (cgno >= uspi->s_ncg) {
- ufs_panic (sb, "ufs_free_blocks", "freeing blocks are outside device");
- goto failed;
- }
- end_bit = bit + count;
- if (end_bit > uspi->s_fpg) {
- overflow = bit + count - uspi->s_fpg;
- count -= overflow;
- end_bit -= overflow;
- }
- ucpi = ufs_load_cylinder (sb, cgno);
- if (!ucpi)
- goto failed;
- ucg = ubh_get_ucg (UCPI_UBH);
- if (!ufs_cg_chkmagic(sb, ucg)) {
- ufs_panic (sb, "ufs_free_blocks", "internal error, bad magic number on cg %u", cgno);
- goto failed;
- }
- for (i = bit; i < end_bit; i += uspi->s_fpb) {
- blkno = ufs_fragstoblks(i);
- if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, blkno)) {
- ufs_error(sb, "ufs_free_blocks", "freeing free fragment");
- }
- ubh_setblock(UCPI_UBH, ucpi->c_freeoff, blkno);
- if ((sb->u.ufs_sb.s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
- ufs_clusteracct (sb, ucpi, blkno, 1);
- DQUOT_FREE_BLOCK(inode, uspi->s_fpb);
- fs32_add(sb, &ucg->cg_cs.cs_nbfree, 1);
- fs32_add(sb, &usb1->fs_cstotal.cs_nbfree, 1);
- fs32_add(sb, &sb->fs_cs(cgno).cs_nbfree, 1);
- cylno = ufs_cbtocylno(i);
- fs16_add(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(i)), 1);
- fs32_add(sb, &ubh_cg_blktot(ucpi, cylno), 1);
- }
- ubh_mark_buffer_dirty (USPI_UBH);
- ubh_mark_buffer_dirty (UCPI_UBH);
- if (sb->s_flags & MS_SYNCHRONOUS) {
- ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi);
- ubh_wait_on_buffer (UCPI_UBH);
- }
- if (overflow) {
- fragment += count;
- count = overflow;
- goto do_more;
- }
- sb->s_dirt = 1;
- unlock_super (sb);
- UFSD(("EXITn"))
- return;
- failed:
- unlock_super (sb);
- UFSD(("EXIT (FAILED)n"))
- return;
- }
- #define NULLIFY_FRAGMENTS
- for (i = oldcount; i < newcount; i++) {
- bh = sb_getblk(sb, result + i);
- memset (bh->b_data, 0, sb->s_blocksize);
- mark_buffer_uptodate(bh, 1);
- mark_buffer_dirty (bh);
- if (IS_SYNC(inode)) {
- ll_rw_block (WRITE, 1, &bh);
- wait_on_buffer (bh);
- }
- brelse (bh);
- }
- unsigned ufs_new_fragments (struct inode * inode, u32 * p, unsigned fragment,
- unsigned goal, unsigned count, int * err )
- {
- struct super_block * sb;
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct buffer_head * bh;
- unsigned cgno, oldcount, newcount, tmp, request, i, result;
-
- UFSD(("ENTER, ino %lu, fragment %u, goal %u, count %un", inode->i_ino, fragment, goal, count))
-
- sb = inode->i_sb;
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first(USPI_UBH);
- *err = -ENOSPC;
- lock_super (sb);
-
- tmp = fs32_to_cpu(sb, *p);
- if (count + ufs_fragnum(fragment) > uspi->s_fpb) {
- ufs_warning (sb, "ufs_new_fragments", "internal warning"
- " fragment %u, count %u", fragment, count);
- count = uspi->s_fpb - ufs_fragnum(fragment);
- }
- oldcount = ufs_fragnum (fragment);
- newcount = oldcount + count;
- /*
- * Somebody else has just allocated our fragments
- */
- if (oldcount) {
- if (!tmp) {
- ufs_error (sb, "ufs_new_fragments", "internal error, "
- "fragment %u, tmp %un", fragment, tmp);
- unlock_super (sb);
- return (unsigned)-1;
- }
- if (fragment < inode->u.ufs_i.i_lastfrag) {
- UFSD(("EXIT (ALREADY ALLOCATED)n"))
- unlock_super (sb);
- return 0;
- }
- }
- else {
- if (tmp) {
- UFSD(("EXIT (ALREADY ALLOCATED)n"))
- unlock_super(sb);
- return 0;
- }
- }
- /*
- * There is not enough space for user on the device
- */
- if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(usb1, UFS_MINFREE) <= 0) {
- unlock_super (sb);
- UFSD(("EXIT (FAILED)n"))
- return 0;
- }
- if (goal >= uspi->s_size)
- goal = 0;
- if (goal == 0)
- cgno = ufs_inotocg (inode->i_ino);
- else
- cgno = ufs_dtog (goal);
-
- /*
- * allocate new fragment
- */
- if (oldcount == 0) {
- result = ufs_alloc_fragments (inode, cgno, goal, count, err);
- if (result) {
- *p = cpu_to_fs32(sb, result);
- *err = 0;
- inode->i_blocks += count << uspi->s_nspfshift;
- inode->u.ufs_i.i_lastfrag = max_t(u32, inode->u.ufs_i.i_lastfrag, fragment + count);
- NULLIFY_FRAGMENTS
- }
- unlock_super(sb);
- UFSD(("EXIT, result %un", result))
- return result;
- }
- /*
- * resize block
- */
- result = ufs_add_fragments (inode, tmp, oldcount, newcount, err);
- if (result) {
- *err = 0;
- inode->i_blocks += count << uspi->s_nspfshift;
- inode->u.ufs_i.i_lastfrag = max_t(u32, inode->u.ufs_i.i_lastfrag, fragment + count);
- NULLIFY_FRAGMENTS
- unlock_super(sb);
- UFSD(("EXIT, result %un", result))
- return result;
- }
- /*
- * allocate new block and move data
- */
- switch (fs32_to_cpu(sb, usb1->fs_optim)) {
- case UFS_OPTSPACE:
- request = newcount;
- if (uspi->s_minfree < 5 || fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree)
- > uspi->s_dsize * uspi->s_minfree / (2 * 100) )
- break;
- usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
- break;
- default:
- usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
-
- case UFS_OPTTIME:
- request = uspi->s_fpb;
- if (fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree) < uspi->s_dsize *
- (uspi->s_minfree - 2) / 100)
- break;
- usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTTIME);
- break;
- }
- result = ufs_alloc_fragments (inode, cgno, goal, request, err);
- if (result) {
- for (i = 0; i < oldcount; i++) {
- bh = sb_bread(sb, tmp + i);
- if(bh)
- {
- mark_buffer_clean (bh);
- bh->b_blocknr = result + i;
- mark_buffer_dirty (bh);
- if (IS_SYNC(inode)) {
- ll_rw_block (WRITE, 1, &bh);
- wait_on_buffer (bh);
- }
- brelse (bh);
- }
- else
- {
- printk(KERN_ERR "ufs_new_fragments: bread failn");
- return 0;
- }
- }
- *p = cpu_to_fs32(sb, result);
- *err = 0;
- inode->i_blocks += count << uspi->s_nspfshift;
- inode->u.ufs_i.i_lastfrag = max_t(u32, inode->u.ufs_i.i_lastfrag, fragment + count);
- NULLIFY_FRAGMENTS
- unlock_super(sb);
- if (newcount < request)
- ufs_free_fragments (inode, result + newcount, request - newcount);
- ufs_free_fragments (inode, tmp, oldcount);
- UFSD(("EXIT, result %un", result))
- return result;
- }
- unlock_super(sb);
- UFSD(("EXIT (FAILED)n"))
- return 0;
- }
- unsigned ufs_add_fragments (struct inode * inode, unsigned fragment,
- unsigned oldcount, unsigned newcount, int * err)
- {
- struct super_block * sb;
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct ufs_cg_private_info * ucpi;
- struct ufs_cylinder_group * ucg;
- unsigned cgno, fragno, fragoff, count, fragsize, i;
-
- UFSD(("ENTER, fragment %u, oldcount %u, newcount %un", fragment, oldcount, newcount))
-
- sb = inode->i_sb;
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first (USPI_UBH);
- count = newcount - oldcount;
-
- cgno = ufs_dtog(fragment);
- if (sb->fs_cs(cgno).cs_nffree < count)
- return 0;
- if ((ufs_fragnum (fragment) + newcount) > uspi->s_fpb)
- return 0;
- ucpi = ufs_load_cylinder (sb, cgno);
- if (!ucpi)
- return 0;
- ucg = ubh_get_ucg (UCPI_UBH);
- if (!ufs_cg_chkmagic(sb, ucg)) {
- ufs_panic (sb, "ufs_add_fragments",
- "internal error, bad magic number on cg %u", cgno);
- return 0;
- }
- fragno = ufs_dtogd (fragment);
- fragoff = ufs_fragnum (fragno);
- for (i = oldcount; i < newcount; i++)
- if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i))
- return 0;
- /*
- * Block can be extended
- */
- ucg->cg_time = cpu_to_fs32(sb, CURRENT_TIME);
- for (i = newcount; i < (uspi->s_fpb - fragoff); i++)
- if (ubh_isclr (UCPI_UBH, ucpi->c_freeoff, fragno + i))
- break;
- fragsize = i - oldcount;
- if (!fs32_to_cpu(sb, ucg->cg_frsum[fragsize]))
- ufs_panic (sb, "ufs_add_fragments",
- "internal error or corrupted bitmap on cg %u", cgno);
- fs32_sub(sb, &ucg->cg_frsum[fragsize], 1);
- if (fragsize != count)
- fs32_add(sb, &ucg->cg_frsum[fragsize - count], 1);
- for (i = oldcount; i < newcount; i++)
- ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, fragno + i);
- if(DQUOT_ALLOC_BLOCK(inode, count)) {
- *err = -EDQUOT;
- return 0;
- }
- fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
- fs32_sub(sb, &sb->fs_cs(cgno).cs_nffree, count);
- fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count);
-
- ubh_mark_buffer_dirty (USPI_UBH);
- ubh_mark_buffer_dirty (UCPI_UBH);
- if (sb->s_flags & MS_SYNCHRONOUS) {
- ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi);
- ubh_wait_on_buffer (UCPI_UBH);
- }
- sb->s_dirt = 1;
- UFSD(("EXIT, fragment %un", fragment))
-
- return fragment;
- }
- #define UFS_TEST_FREE_SPACE_CG
- ucg = (struct ufs_cylinder_group *) sb->u.ufs_sb.s_ucg[cgno]->b_data;
- if (fs32_to_cpu(sb, ucg->cg_cs.cs_nbfree))
- goto cg_found;
- for (k = count; k < uspi->s_fpb; k++)
- if (fs32_to_cpu(sb, ucg->cg_frsum[k]))
- goto cg_found;
- unsigned ufs_alloc_fragments (struct inode * inode, unsigned cgno,
- unsigned goal, unsigned count, int * err)
- {
- struct super_block * sb;
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct ufs_cg_private_info * ucpi;
- struct ufs_cylinder_group * ucg;
- unsigned oldcg, i, j, k, result, allocsize;
-
- UFSD(("ENTER, ino %lu, cgno %u, goal %u, count %un", inode->i_ino, cgno, goal, count))
- sb = inode->i_sb;
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first(USPI_UBH);
- oldcg = cgno;
-
- /*
- * 1. searching on preferred cylinder group
- */
- UFS_TEST_FREE_SPACE_CG
- /*
- * 2. quadratic rehash
- */
- for (j = 1; j < uspi->s_ncg; j *= 2) {
- cgno += j;
- if (cgno >= uspi->s_ncg)
- cgno -= uspi->s_ncg;
- UFS_TEST_FREE_SPACE_CG
- }
- /*
- * 3. brute force search
- * We start at i = 2 ( 0 is checked at 1.step, 1 at 2.step )
- */
- cgno = (oldcg + 1) % uspi->s_ncg;
- for (j = 2; j < uspi->s_ncg; j++) {
- cgno++;
- if (cgno >= uspi->s_ncg)
- cgno = 0;
- UFS_TEST_FREE_SPACE_CG
- }
-
- UFSD(("EXIT (FAILED)n"))
- return 0;
- cg_found:
- ucpi = ufs_load_cylinder (sb, cgno);
- if (!ucpi)
- return 0;
- ucg = ubh_get_ucg (UCPI_UBH);
- if (!ufs_cg_chkmagic(sb, ucg))
- ufs_panic (sb, "ufs_alloc_fragments",
- "internal error, bad magic number on cg %u", cgno);
- ucg->cg_time = cpu_to_fs32(sb, CURRENT_TIME);
- if (count == uspi->s_fpb) {
- result = ufs_alloccg_block (inode, ucpi, goal, err);
- if (result == (unsigned)-1)
- return 0;
- goto succed;
- }
- for (allocsize = count; allocsize < uspi->s_fpb; allocsize++)
- if (fs32_to_cpu(sb, ucg->cg_frsum[allocsize]) != 0)
- break;
-
- if (allocsize == uspi->s_fpb) {
- result = ufs_alloccg_block (inode, ucpi, goal, err);
- if (result == (unsigned)-1)
- return 0;
- goal = ufs_dtogd (result);
- for (i = count; i < uspi->s_fpb; i++)
- ubh_setbit (UCPI_UBH, ucpi->c_freeoff, goal + i);
- i = uspi->s_fpb - count;
- DQUOT_FREE_BLOCK(inode, i);
- fs32_add(sb, &ucg->cg_cs.cs_nffree, i);
- fs32_add(sb, &usb1->fs_cstotal.cs_nffree, i);
- fs32_add(sb, &sb->fs_cs(cgno).cs_nffree, i);
- fs32_add(sb, &ucg->cg_frsum[i], 1);
- goto succed;
- }
- result = ufs_bitmap_search (sb, ucpi, goal, allocsize);
- if (result == (unsigned)-1)
- return 0;
- if(DQUOT_ALLOC_BLOCK(inode, count)) {
- *err = -EDQUOT;
- return 0;
- }
- for (i = 0; i < count; i++)
- ubh_clrbit (UCPI_UBH, ucpi->c_freeoff, result + i);
-
- fs32_sub(sb, &ucg->cg_cs.cs_nffree, count);
- fs32_sub(sb, &usb1->fs_cstotal.cs_nffree, count);
- fs32_sub(sb, &sb->fs_cs(cgno).cs_nffree, count);
- fs32_sub(sb, &ucg->cg_frsum[allocsize], 1);
- if (count != allocsize)
- fs32_add(sb, &ucg->cg_frsum[allocsize - count], 1);
- succed:
- ubh_mark_buffer_dirty (USPI_UBH);
- ubh_mark_buffer_dirty (UCPI_UBH);
- if (sb->s_flags & MS_SYNCHRONOUS) {
- ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi);
- ubh_wait_on_buffer (UCPI_UBH);
- }
- sb->s_dirt = 1;
- result += cgno * uspi->s_fpg;
- UFSD(("EXIT3, result %un", result))
- return result;
- }
- unsigned ufs_alloccg_block (struct inode * inode,
- struct ufs_cg_private_info * ucpi, unsigned goal, int * err)
- {
- struct super_block * sb;
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct ufs_cylinder_group * ucg;
- unsigned result, cylno, blkno;
- UFSD(("ENTER, goal %un", goal))
- sb = inode->i_sb;
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first(USPI_UBH);
- ucg = ubh_get_ucg(UCPI_UBH);
- if (goal == 0) {
- goal = ucpi->c_rotor;
- goto norot;
- }
- goal = ufs_blknum (goal);
- goal = ufs_dtogd (goal);
-
- /*
- * If the requested block is available, use it.
- */
- if (ubh_isblockset(UCPI_UBH, ucpi->c_freeoff, ufs_fragstoblks(goal))) {
- result = goal;
- goto gotit;
- }
-
- norot:
- result = ufs_bitmap_search (sb, ucpi, goal, uspi->s_fpb);
- if (result == (unsigned)-1)
- return (unsigned)-1;
- ucpi->c_rotor = result;
- gotit:
- blkno = ufs_fragstoblks(result);
- ubh_clrblock (UCPI_UBH, ucpi->c_freeoff, blkno);
- if ((sb->u.ufs_sb.s_flags & UFS_CG_MASK) == UFS_CG_44BSD)
- ufs_clusteracct (sb, ucpi, blkno, -1);
- if(DQUOT_ALLOC_BLOCK(inode, uspi->s_fpb)) {
- *err = -EDQUOT;
- return (unsigned)-1;
- }
- fs32_sub(sb, &ucg->cg_cs.cs_nbfree, 1);
- fs32_sub(sb, &usb1->fs_cstotal.cs_nbfree, 1);
- fs32_sub(sb, &sb->fs_cs(ucpi->c_cgx).cs_nbfree, 1);
- cylno = ufs_cbtocylno(result);
- fs16_sub(sb, &ubh_cg_blks(ucpi, cylno, ufs_cbtorpos(result)), 1);
- fs32_sub(sb, &ubh_cg_blktot(ucpi, cylno), 1);
-
- UFSD(("EXIT, result %un", result))
- return result;
- }
- unsigned ufs_bitmap_search (struct super_block * sb,
- struct ufs_cg_private_info * ucpi, unsigned goal, unsigned count)
- {
- struct ufs_sb_private_info * uspi;
- struct ufs_super_block_first * usb1;
- struct ufs_cylinder_group * ucg;
- unsigned start, length, location, result;
- unsigned possition, fragsize, blockmap, mask;
-
- UFSD(("ENTER, cg %u, goal %u, count %un", ucpi->c_cgx, goal, count))
- uspi = sb->u.ufs_sb.s_uspi;
- usb1 = ubh_get_usb_first (USPI_UBH);
- ucg = ubh_get_ucg(UCPI_UBH);
- if (goal)
- start = ufs_dtogd(goal) >> 3;
- else
- start = ucpi->c_frotor >> 3;
-
- length = ((uspi->s_fpg + 7) >> 3) - start;
- location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff + start, length,
- (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other,
- 1 << (count - 1 + (uspi->s_fpb & 7)));
- if (location == 0) {
- length = start + 1;
- location = ubh_scanc(UCPI_UBH, ucpi->c_freeoff, length,
- (uspi->s_fpb == 8) ? ufs_fragtable_8fpb : ufs_fragtable_other,
- 1 << (count - 1 + (uspi->s_fpb & 7)));
- if (location == 0) {
- ufs_error (sb, "ufs_bitmap_search",
- "bitmap corrupted on cg %u, start %u, length %u, count %u, freeoff %un",
- ucpi->c_cgx, start, length, count, ucpi->c_freeoff);
- return (unsigned)-1;
- }
- start = 0;
- }
- result = (start + length - location) << 3;
- ucpi->c_frotor = result;
- /*
- * found the byte in the map
- */
- blockmap = ubh_blkmap(UCPI_UBH, ucpi->c_freeoff, result);
- fragsize = 0;
- for (possition = 0, mask = 1; possition < 8; possition++, mask <<= 1) {
- if (blockmap & mask) {
- if (!(possition & uspi->s_fpbmask))
- fragsize = 1;
- else
- fragsize++;
- }
- else {
- if (fragsize == count) {
- result += possition - count;
- UFSD(("EXIT, result %un", result))
- return result;
- }
- fragsize = 0;
- }
- }
- if (fragsize == count) {
- result += possition - count;
- UFSD(("EXIT, result %un", result))
- return result;
- }
- ufs_error (sb, "ufs_bitmap_search", "block not in map on cg %un", ucpi->c_cgx);
- UFSD(("EXIT (FAILED)n"))
- return (unsigned)-1;
- }
- void ufs_clusteracct(struct super_block * sb,
- struct ufs_cg_private_info * ucpi, unsigned blkno, int cnt)
- {
- struct ufs_sb_private_info * uspi;
- int i, start, end, forw, back;
-
- uspi = sb->u.ufs_sb.s_uspi;
- if (uspi->s_contigsumsize <= 0)
- return;
- if (cnt > 0)
- ubh_setbit(UCPI_UBH, ucpi->c_clusteroff, blkno);
- else
- ubh_clrbit(UCPI_UBH, ucpi->c_clusteroff, blkno);
- /*
- * Find the size of the cluster going forward.
- */
- start = blkno + 1;
- end = start + uspi->s_contigsumsize;
- if ( end >= ucpi->c_nclusterblks)
- end = ucpi->c_nclusterblks;
- i = ubh_find_next_zero_bit (UCPI_UBH, ucpi->c_clusteroff, end, start);
- if (i > end)
- i = end;
- forw = i - start;
-
- /*
- * Find the size of the cluster going backward.
- */
- start = blkno - 1;
- end = start - uspi->s_contigsumsize;
- if (end < 0 )
- end = -1;
- i = ubh_find_last_zero_bit (UCPI_UBH, ucpi->c_clusteroff, start, end);
- if ( i < end)
- i = end;
- back = start - i;
-
- /*
- * Account for old cluster and the possibly new forward and
- * back clusters.
- */
- i = back + forw + 1;
- if (i > uspi->s_contigsumsize)
- i = uspi->s_contigsumsize;
- fs32_add(sb, (u32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (i << 2)), cnt);
- if (back > 0)
- fs32_sub(sb, (u32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (back << 2)), cnt);
- if (forw > 0)
- fs32_sub(sb, (u32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (forw << 2)), cnt);
- }
- static unsigned char ufs_fragtable_8fpb[] = {
- 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
- 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
- 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A,
- 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x08, 0x09, 0x09, 0x0A, 0x10, 0x11, 0x20, 0x40,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
- 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
- 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0A,
- 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0A, 0x12,
- 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0C,
- 0x08, 0x09, 0x09, 0x0A, 0x09, 0x09, 0x0A, 0x0C, 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
- };
- static unsigned char ufs_fragtable_other[] = {
- 0x00, 0x16, 0x16, 0x2A, 0x16, 0x16, 0x26, 0x4E, 0x16, 0x16, 0x16, 0x3E, 0x2A, 0x3E, 0x4E, 0x8A,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x26, 0x36, 0x36, 0x2E, 0x36, 0x36, 0x26, 0x6E, 0x36, 0x36, 0x36, 0x3E, 0x2E, 0x3E, 0x6E, 0xAE,
- 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x16, 0x16, 0x16, 0x3E, 0x16, 0x16, 0x36, 0x5E, 0x16, 0x16, 0x16, 0x3E, 0x3E, 0x3E, 0x5E, 0x9E,
- 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE,
- 0x2A, 0x3E, 0x3E, 0x2A, 0x3E, 0x3E, 0x2E, 0x6E, 0x3E, 0x3E, 0x3E, 0x3E, 0x2A, 0x3E, 0x6E, 0xAA,
- 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x3E, 0x7E, 0xBE,
- 0x4E, 0x5E, 0x5E, 0x6E, 0x5E, 0x5E, 0x6E, 0x4E, 0x5E, 0x5E, 0x5E, 0x7E, 0x6E, 0x7E, 0x4E, 0xCE,
- 0x8A, 0x9E, 0x9E, 0xAA, 0x9E, 0x9E, 0xAE, 0xCE, 0x9E, 0x9E, 0x9E, 0xBE, 0xAA, 0xBE, 0xCE, 0x8A,
- };