The patch titled
reiserfs: workaround for dead loop in finish_unfinished
has been removed from the -mm tree. Its filename was
reiserfs-workaround-for-dead-loop-in-finish_unfinished.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: reiserfs: workaround for dead loop in finish_unfinished
From: Lepton Wu <ytht.net@xxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxx: cleanups]
Signed-off-by: Lepton Wu <ytht.net@xxxxxxxxx>
Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: Jeff Mahoney <jeffm@xxxxxxxx>
Cc: "Vladimir V. Saveliev" <vs@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/reiserfs/super.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff -puN fs/reiserfs/super.c~reiserfs-workaround-for-dead-loop-in-finish_unfinished fs/reiserfs/super.c
--- a/fs/reiserfs/super.c~reiserfs-workaround-for-dead-loop-in-finish_unfinished
+++ a/fs/reiserfs/super.c
@@ -145,7 +145,7 @@ static int finish_unfinished(struct supe
{
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 supe
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 supe
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);
_
Patches currently in -mm which might be from ytht.net@xxxxxxxxx are
origin.patch
-
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