Date:	Wed, 13 May 2009 18:13:44 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 13232] ext3/4 with synchronous writes gets wedged by Postfix

http://bugzilla.kernel.org/show_bug.cgi?id=13232





--- Comment #7 from Anonymous Emailer <anonymous@...nel-bugs.osdl.org>  2009-05-13 18:13:42 ---
Reply-To: viro@...IV.linux.org.uk

On Wed, May 13, 2009 at 05:52:54PM +0100, Al Viro wrote:
> On Wed, May 13, 2009 at 03:48:02PM +0200, Jan Kara wrote:
> > >   Here, we have started a transaction in ext3_create() and then wait in
> > > find_inode_fast() for I_FREEING to be cleared (obviously we have
> > > reallocated the inode and squeezed the allocation before journal_stop()
> > > from the delete was called).
> > >   Nasty deadlock and I don't see how to fix it now - have to go home for
> > > today... Tomorrow I'll have a look what we can do about it.
> >   OK, the deadlock has been introduced by ext3 variant of
> > 261bca86ed4f7f391d1938167624e78da61dcc6b (adding Al to CC). The deadlock
> > is really tough to avoid - we have to first allocate inode on disk so
> > that we know the inode number. For this we need transaction open but we
> > cannot afford waiting for old inode with same INO to be freed when we have
> > transaction open because of the above deadlock. So we'd have to wait for
> > inode release only after everything is done and we closed the transaction. But
> > that would mean reordering a lot of code in ext3/namei.c so that all the
> > dcache handling is done after all the IO is done.
> >   Hmm, maybe we could change the delete side of the deadlock but that's
> > going to be tricky as well :(.
> >   Al, any idea if we could somehow get away without waiting on
> > I_FREEING?
> 
> At which point do we actually run into deadlock on delete side?  We could,
> in principle, skip everything like that in insert_inode_locked(), but
> I would rather avoid the "two inodes in icache at the same time, with the
> same inumber" situations completely.  We might get away with that, since
> everything else *will* wait, so we can afford a bunch of inodes past the
> point in foo_delete_inode() that has cleared it in bitmap + new locked
> one, but if it's at all possible to avoid, I'd rather avoid it.

OK, that's probably the easiest way to do that, as much as I don't like it...
Since iget() et.al. will not accept I_FREEING (will wait to go away
and restart), and since we'd better have serialization between new/free
on fs data structures anyway, we can afford simply skipping I_FREEING
et.al. in insert_inode_locked().

We do that from new_inode, so it won't race with free_inode in any interesting
ways and it won't race with iget (of any origin; nfsd or in case of fs
corruption a lookup) since both still will wait for I_LOCK.

Tentative patch follow; folks, I would very much like review on that one,
since I'm far too low on caffeine and the area is nasty.

diff --git a/fs/inode.c b/fs/inode.c
index 9d26490..4406952 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1053,13 +1053,22 @@ int insert_inode_locked(struct inode *inode)
     struct super_block *sb = inode->i_sb;
     ino_t ino = inode->i_ino;
     struct hlist_head *head = inode_hashtable + hash(sb, ino);
-    struct inode *old;

     inode->i_state |= I_LOCK|I_NEW;
     while (1) {
+        struct hlist_node *node;
+        struct inode *old = NULL;
         spin_lock(&inode_lock);
-        old = find_inode_fast(sb, head, ino);
-        if (likely(!old)) {
+        hlist_for_each_entry(old, node, head, i_hash) {
+            if (old->i_ino != ino)
+                continue;
+            if (old->i_sb != sb)
+                continue;
+            if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
+                continue;
+            break;
+        }
+        if (likely(!node)) {
             hlist_add_head(&inode->i_hash, head);
             spin_unlock(&inode_lock);
             return 0;
@@ -1081,14 +1090,24 @@ int insert_inode_locked4(struct inode *inode, unsigned
long hashval,
 {
     struct super_block *sb = inode->i_sb;
     struct hlist_head *head = inode_hashtable + hash(sb, hashval);
-    struct inode *old;

     inode->i_state |= I_LOCK|I_NEW;

     while (1) {
+        struct hlist_node *node;
+        struct inode *old = NULL;
+
         spin_lock(&inode_lock);
-        old = find_inode(sb, head, test, data);
-        if (likely(!old)) {
+        hlist_for_each_entry(old, node, head, i_hash) {
+            if (old->i_sb != sb)
+                continue;
+            if (!test(old, data))
+                continue;
+            if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
+                continue;
+            break;
+        }
+        if (likely(!node)) {
             hlist_add_head(&inode->i_hash, head);
             spin_unlock(&inode_lock);
             return 0;

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