[ 01/52] vfs: dcache: fix deadlock in tree traversal

From: Greg Kroah-Hartman
Date: Thu Oct 04 2012 - 17:51:16 EST


3.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <miklos@xxxxxxxxxx>

commit 8110e16d42d587997bcaee0c864179e6d93603fe upstream.

IBM reported a deadlock in select_parent(). This was found to be caused
by taking rename_lock when already locked when restarting the tree
traversal.

There are two cases when the traversal needs to be restarted:

1) concurrent d_move(); this can only happen when not already locked,
since taking rename_lock protects against concurrent d_move().

2) racing with final d_put() on child just at the moment of ascending
to parent; rename_lock doesn't protect against this rare race, so it
can happen when already locked.

Because of case 2, we need to be able to handle restarting the traversal
when rename_lock is already held. This patch fixes all three callers of
try_to_ascend().

IBM reported that the deadlock is gone with this patch.

[ I rewrote the patch to be smaller and just do the "goto again" if the
lock was already held, but credit goes to Miklos for the real work.
- Linus ]

Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/dcache.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1116,6 +1116,8 @@ positive:
return 1;

rename_retry:
+ if (locked)
+ goto again;
locked = 1;
write_seqlock(&rename_lock);
goto again;
@@ -1218,6 +1220,8 @@ out:
rename_retry:
if (found)
return found;
+ if (locked)
+ goto again;
locked = 1;
write_seqlock(&rename_lock);
goto again;
@@ -2963,6 +2967,8 @@ resume:
return;

rename_retry:
+ if (locked)
+ goto again;
locked = 1;
write_seqlock(&rename_lock);
goto again;


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