diff options
Diffstat (limited to 'fs/ufs/balloc.c')
| -rw-r--r-- | fs/ufs/balloc.c | 818 |
1 files changed, 818 insertions, 0 deletions
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c new file mode 100644 index 000000000000..997640c99c7d --- /dev/null +++ b/fs/ufs/balloc.c @@ -0,0 +1,818 @@ +/* + * 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/time.h> +#include <linux/string.h> +#include <linux/quotaops.h> +#include <linux/buffer_head.h> +#include <linux/sched.h> +#include <linux/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 + +static unsigned ufs_add_fragments (struct inode *, unsigned, unsigned, unsigned, int *); +static unsigned ufs_alloc_fragments (struct inode *, unsigned, unsigned, unsigned, int *); +static unsigned ufs_alloccg_block (struct inode *, struct ufs_cg_private_info *, unsigned, int *); +static unsigned ufs_bitmap_search (struct super_block *, struct ufs_cg_private_info *, unsigned, unsigned); +static unsigned char ufs_fragtable_8fpb[], ufs_fragtable_other[]; +static 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 = UFS_SB(sb)->s_uspi; + usb1 = ubh_get_usb_first(USPI_UBH); + + UFSD(("ENTER, fragment %u, count %u\n", 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, &UFS_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, &UFS_SB(sb)->fs_cs(cgno).cs_nffree, uspi->s_fpb); + if ((UFS_SB(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, &UFS_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_wait_on_buffer (UCPI_UBH); + 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(("EXIT\n")) + 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 = UFS_SB(sb)->s_uspi; + usb1 = ubh_get_usb_first(USPI_UBH); + + UFSD(("ENTER, fragment %u, count %u\n", fragment, count)) + + if ((fragment & uspi->s_fpbmask) || (count & uspi->s_fpbmask)) { + ufs_error (sb, "ufs_free_blocks", "internal error, " + "fragment %u, count %u\n", 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 ((UFS_SB(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, &UFS_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_wait_on_buffer (UCPI_UBH); + 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(("EXIT\n")) + 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); \ + set_buffer_uptodate(bh); \ + mark_buffer_dirty (bh); \ + if (IS_SYNC(inode)) \ + sync_dirty_buffer(bh); \ + brelse (bh); \ + } + +unsigned ufs_new_fragments (struct inode * inode, __fs32 * 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 %u\n", inode->i_ino, fragment, goal, count)) + + sb = inode->i_sb; + uspi = UFS_SB(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 %u\n", fragment, tmp); + unlock_super (sb); + return (unsigned)-1; + } + if (fragment < UFS_I(inode)->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; + UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); + NULLIFY_FRAGMENTS + } + unlock_super(sb); + UFSD(("EXIT, result %u\n", 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; + UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count); + NULLIFY_FRAGMENTS + unlock_super(sb); + UFSD(("EXIT, result %u\n", 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) + { + clear_buffer_dirty(bh); + bh->b_blocknr = result + i; + mark_buffer_dirty (bh); + if (IS_SYNC(inode)) + sync_dirty_buffer(bh); + brelse (bh); + } + else + { + printk(KERN_ERR "ufs_new_fragments: bread fail\n"); + unlock_super(sb); + return 0; + } + } + *p = cpu_to_fs32(sb, result); + *err = 0; + inode->i_blocks += count << uspi->s_nspfshift; + UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->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 %u\n", result)) + return result; + } + + unlock_super(sb); + UFSD(("EXIT (FAILED)\n")) + return 0; +} + +static 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 %u\n", fragment, oldcount, newcount)) + + sb = inode->i_sb; + uspi = UFS_SB(sb)->s_uspi; + usb1 = ubh_get_usb_first (USPI_UBH); + count = newcount - oldcount; + + cgno = ufs_dtog(fragment); + if (fs32_to_cpu(sb, UFS_SB(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, get_seconds()); + 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, &UFS_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_wait_on_buffer (UCPI_UBH); + ubh_ll_rw_block (WRITE, 1, (struct ufs_buffer_head **)&ucpi); + ubh_wait_on_buffer (UCPI_UBH); + } + sb->s_dirt = 1; + + UFSD(("EXIT, fragment %u\n", fragment)) + + return fragment; +} + +#define UFS_TEST_FREE_SPACE_CG \ + ucg = (struct ufs_cylinder_group *) UFS_SB(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; + +static 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 %u\n", inode->i_ino, cgno, goal, count)) + + sb = inode->i_sb; + uspi = UFS_SB(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, get_seconds()); + + 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, &UFS_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, &UFS_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_wait_on_buffer (UCPI_UBH); + 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 %u\n", result)) + return result; +} + +static 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 %u\n", goal)) + + sb = inode->i_sb; + uspi = UFS_SB(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 ((UFS_SB(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, &UFS_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 %u\n", result)) + + return result; +} + +static 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 %u\n", ucpi->c_cgx, goal, count)) + + uspi = UFS_SB(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 %u\n", + 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 %u\n", result)) + return result; + } + fragsize = 0; + } + } + if (fragsize == count) { + result += possition - count; + UFSD(("EXIT, result %u\n", result)) + return result; + } + ufs_error (sb, "ufs_bitmap_search", "block not in map on cg %u\n", ucpi->c_cgx); + UFSD(("EXIT (FAILED)\n")) + return (unsigned)-1; +} + +static 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 = UFS_SB(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, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (i << 2)), cnt); + if (back > 0) + fs32_sub(sb, (__fs32*)ubh_get_addr(UCPI_UBH, ucpi->c_clustersumoff + (back << 2)), cnt); + if (forw > 0) + fs32_sub(sb, (__fs32*)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, +}; 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