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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/ufs/balloc.c
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/ufs/balloc.c')
-rw-r--r--fs/ufs/balloc.c818
1 files changed, 818 insertions, 0 deletions
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
new file mode 100644
index 00000000000..997640c99c7
--- /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,
+};