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reiserfs: workaround for dead loop in finish_unfinished 

There is possible dead loop in finish_unfinished function.

In most situation, the call chain iput -> ...  -> reiserfs_delete_inode ->
remove_save_link will success.  But for some reason such as data
corruption, reiserfs_delete_inode fails on reiserfs_do_truncate ->
search_for_position_by_key.

Then remove_save_link won't be called.  We always get the same
"save_link_key" in the while loop in finish_unfinished function.  The
following patch adds a check for the possible dead loop and just remove
save link when deap loop.

[akpm@linux-foundation.org: cleanups]
Signed-off-by: Lepton Wu <ytht.net@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lepton Wu 2007-10-16 23:30:04 -07:00 committed by Linus Torvalds
parent b9ec0339d8
commit fb46f341d9
1 changed files with 15 additions and 3 deletions
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18
fs/reiserfs/super.c
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@ -145,7 +145,7 @@ static int finish_unfinished(struct super_block *s)
{
INITIALIZE_PATH(path);
struct cpu_key max_cpu_key, obj_key;
struct reiserfs_key save_link_key;
struct reiserfs_key save_link_key, last_inode_key;
int retval = 0;
struct item_head *ih;
struct buffer_head *bh;
@ -166,6 +166,8 @@ static int finish_unfinished(struct super_block *s)
set_cpu_key_k_offset(&max_cpu_key, ~0U);
max_cpu_key.key_length = 3;
memset(&last_inode_key, 0, sizeof(last_inode_key));
#ifdef CONFIG_QUOTA
/* Needed for iput() to work correctly and not trash data */
if (s->s_flags & MS_ACTIVE) {
@ -278,8 +280,18 @@ static int finish_unfinished(struct super_block *s)
REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
/* not completed unlink (rmdir) found */
reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
/* removal gets completed in iput */
retval = 0;
if (memcmp(&last_inode_key, INODE_PKEY(inode),
sizeof(last_inode_key))){
last_inode_key = *INODE_PKEY(inode);
/* removal gets completed in iput */
retval = 0;
} else {
reiserfs_warning(s, "Dead loop in "
"finish_unfinished detected, "
"just remove save link\n");
retval = remove_save_link_only(s,
&save_link_key, 0);
}
}
iput(inode);