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authorEvgeniy Dushistov <dushistov@mail.ru>2006-06-25 05:47:18 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:01:01 -0700
commit2061df0f89201c0abeb4c17d343309c9fae5b861 (patch)
treea641b77e6197e6416dc043452db347dbfbb4bd3e /fs/ufs
parenta9adb8dbcd7a337620862106f8c17aeb5e7278c7 (diff)
[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>
Diffstat (limited to 'fs/ufs')
-rw-r--r--fs/ufs/truncate.c55
-rw-r--r--fs/ufs/util.c12
-rw-r--r--fs/ufs/util.h1
3 files changed, 21 insertions, 47 deletions
diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c
index 02e86291ef8..29c66e1e24d 100644
--- a/fs/ufs/truncate.c
+++ b/fs/ufs/truncate.c
@@ -238,18 +238,13 @@ 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;
- mark_inode_dirty(inode);
- ufs_free_blocks (inode, tmp, uspi->s_fpb);
- ubh_bforget(ind_ubh);
- ind_ubh = NULL;
- }
+ tmp = fs32_to_cpu(sb, *p);
+ *p = 0;
+ inode->i_blocks -= uspi->s_nspb;
+ 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)) {
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))
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;
- mark_inode_dirty(inode);
- ufs_free_blocks (inode, tmp, uspi->s_fpb);
- ubh_bforget(dind_bh);
- dind_bh = NULL;
- }
+ tmp = fs32_to_cpu(sb, *p);
+ *p = 0;
+ inode->i_blocks -= uspi->s_nspb;
+ mark_inode_dirty(inode);
+ 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)) {
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))
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;
- mark_inode_dirty(inode);
- ufs_free_blocks (inode, tmp, uspi->s_fpb);
- ubh_bforget(tind_bh);
- tind_bh = NULL;
- }
+ tmp = fs32_to_cpu(sb, *p);
+ *p = 0;
+ inode->i_blocks -= uspi->s_nspb;
+ mark_inode_dirty(inode);
+ 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)) {
ubh_ll_rw_block (SWRITE, 1, &tind_bh);
diff --git a/fs/ufs/util.c b/fs/ufs/util.c
index 59acc8f073a..72f91cc84bf 100644
--- a/fs/ufs/util.c
+++ b/fs/ufs/util.c
@@ -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;
diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 48d6d9bcc15..e10362d8f45 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -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)