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[PATCH] ufs: ufs_trunc_indirect: infinite cycle 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/ufs/truncate.c
View File

@ -238,10 +238,6 @@ static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
if (*ubh_get_addr32(ind_ubh,i))
break;
if (i >= uspi->s_apb) {
if (ubh_max_bcount(ind_ubh) != 1) {
retry = 1;
}
else {
tmp = fs32_to_cpu(sb, *p);
*p = 0;
inode->i_blocks -= uspi->s_nspb;
@ -250,7 +246,6 @@ static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
ubh_bforget(ind_ubh);
ind_ubh = NULL;
}
}
if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
ubh_ll_rw_block (SWRITE, 1, &ind_ubh);
ubh_wait_on_buffer (ind_ubh);
@ -306,9 +301,6 @@ static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
if (*ubh_get_addr32 (dind_bh, i))
break;
if (i >= uspi->s_apb) {
if (ubh_max_bcount(dind_bh) != 1)
retry = 1;
else {
tmp = fs32_to_cpu(sb, *p);
*p = 0;
inode->i_blocks -= uspi->s_nspb;
@ -317,7 +309,6 @@ static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
ubh_bforget(dind_bh);
dind_bh = NULL;
}
}
if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
ubh_ll_rw_block (SWRITE, 1, &dind_bh);
ubh_wait_on_buffer (dind_bh);
@ -370,9 +361,6 @@ static int ufs_trunc_tindirect (struct inode * inode)
if (*ubh_get_addr32 (tind_bh, i))
break;
if (i >= uspi->s_apb) {
if (ubh_max_bcount(tind_bh) != 1)
retry = 1;
else {
tmp = fs32_to_cpu(sb, *p);
*p = 0;
inode->i_blocks -= uspi->s_nspb;
@ -381,7 +369,6 @@ static int ufs_trunc_tindirect (struct inode * inode)
ubh_bforget(tind_bh);
tind_bh = NULL;
}
}
if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
ubh_ll_rw_block (SWRITE, 1, &tind_bh);
ubh_wait_on_buffer (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]);
}
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)
{
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_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)