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[PATCH] ufs: ufs_trunc_indirect: infinite cycle

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Currently, ufs write support have two sets of problems: work with files and
work with directories.

This series of patches should solve the first problem.

This patch is similar to http://lkml.org/lkml/2006/1/17/61 this patch
complements it.

The situation the same: in ufs_trunc_(not direct), we read block, check if
count of links to it is equal to one, if so we finish cycle, if not
continue.  Because of "count of links" always >=2 this operation cause
infinite cycle and hang up the kernel.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Evgeniy Dushistov 2006-06-25 05:47:18 -07:00 committed by Linus Torvalds
parent a9adb8dbcd
commit 2061df0f89
3 changed files with 21 additions and 47 deletions
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55
fs/ufs/truncate.c
View file

@ -238,18 +238,13 @@ static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
if (*ubh_get_addr32(ind_ubh,i)) if (*ubh_get_addr32(ind_ubh,i))
break; break;
if (i >= uspi->s_apb) { if (i >= uspi->s_apb) {
if (ubh_max_bcount(ind_ubh) != 1) { tmp = fs32_to_cpu(sb, *p);
retry = 1; *p = 0;
} inode->i_blocks -= uspi->s_nspb;
else { mark_inode_dirty(inode);
tmp = fs32_to_cpu(sb, *p); ufs_free_blocks (inode, tmp, uspi->s_fpb);
*p = 0; ubh_bforget(ind_ubh);
inode->i_blocks -= uspi->s_nspb; ind_ubh = NULL;
mark_inode_dirty(inode);
ufs_free_blocks (inode, tmp, uspi->s_fpb);
ubh_bforget(ind_ubh);
ind_ubh = NULL;
}
} }
if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) { if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
ubh_ll_rw_block (SWRITE, 1, &ind_ubh); ubh_ll_rw_block (SWRITE, 1, &ind_ubh);
@ -306,17 +301,13 @@ static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
if (*ubh_get_addr32 (dind_bh, i)) if (*ubh_get_addr32 (dind_bh, i))
break; break;
if (i >= uspi->s_apb) { if (i >= uspi->s_apb) {
if (ubh_max_bcount(dind_bh) != 1) tmp = fs32_to_cpu(sb, *p);
retry = 1; *p = 0;
else { inode->i_blocks -= uspi->s_nspb;
tmp = fs32_to_cpu(sb, *p); mark_inode_dirty(inode);
*p = 0; ufs_free_blocks (inode, tmp, uspi->s_fpb);
inode->i_blocks -= uspi->s_nspb; ubh_bforget(dind_bh);
mark_inode_dirty(inode); dind_bh = NULL;
ufs_free_blocks (inode, tmp, uspi->s_fpb);
ubh_bforget(dind_bh);
dind_bh = NULL;
}
} }
if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) { if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
ubh_ll_rw_block (SWRITE, 1, &dind_bh); ubh_ll_rw_block (SWRITE, 1, &dind_bh);
@ -370,17 +361,13 @@ static int ufs_trunc_tindirect (struct inode * inode)
if (*ubh_get_addr32 (tind_bh, i)) if (*ubh_get_addr32 (tind_bh, i))
break; break;
if (i >= uspi->s_apb) { if (i >= uspi->s_apb) {
if (ubh_max_bcount(tind_bh) != 1) tmp = fs32_to_cpu(sb, *p);
retry = 1; *p = 0;
else { inode->i_blocks -= uspi->s_nspb;
tmp = fs32_to_cpu(sb, *p); mark_inode_dirty(inode);
*p = 0; ufs_free_blocks (inode, tmp, uspi->s_fpb);
inode->i_blocks -= uspi->s_nspb; ubh_bforget(tind_bh);
mark_inode_dirty(inode); tind_bh = NULL;
ufs_free_blocks (inode, tmp, uspi->s_fpb);
ubh_bforget(tind_bh);
tind_bh = NULL;
}
} }
if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) { if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
ubh_ll_rw_block (SWRITE, 1, &tind_bh); ubh_ll_rw_block (SWRITE, 1, &tind_bh);

12
fs/ufs/util.c
View file

@ -139,18 +139,6 @@ void ubh_wait_on_buffer (struct ufs_buffer_head * ubh)
wait_on_buffer (ubh->bh[i]); wait_on_buffer (ubh->bh[i]);
} }
unsigned ubh_max_bcount (struct ufs_buffer_head * ubh)
{
unsigned i;
unsigned max = 0;
if (!ubh)
return 0;
for ( i = 0; i < ubh->count; i++ )
if ( atomic_read(&ubh->bh[i]->b_count) > max )
max = atomic_read(&ubh->bh[i]->b_count);
return max;
}
void ubh_bforget (struct ufs_buffer_head * ubh) void ubh_bforget (struct ufs_buffer_head * ubh)
{ {
unsigned i; unsigned i;

1
fs/ufs/util.h
View file

@ -238,7 +238,6 @@ extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int); 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_ll_rw_block (int, unsigned, struct ufs_buffer_head **);
extern void ubh_wait_on_buffer (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 void ubh_bforget (struct ufs_buffer_head *);
extern int ubh_buffer_dirty (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) #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)