From 8c0bec2151a47906bf779c6715a10ce04453ab77 Mon Sep 17 00:00:00 2001 From: Jiaying Zhang Date: Wed, 31 Aug 2011 11:50:51 -0400 Subject: ext4: remove i_mutex lock in ext4_evict_inode to fix lockdep complaining The i_mutex lock and flush_completed_IO() added by commit 2581fdc810 in ext4_evict_inode() causes lockdep complaining about potential deadlock in several places. In most/all of these LOCKDEP complaints it looks like it's a false positive, since many of the potential circular locking cases can't take place by the time the ext4_evict_inode() is called; but since at the very least it may mask real problems, we need to address this. This change removes the flush_completed_IO() and i_mutex lock in ext4_evict_inode(). Instead, we take a different approach to resolve the software lockup that commit 2581fdc810 intends to fix. Rather than having ext4-dio-unwritten thread wait for grabing the i_mutex lock of an inode, we use mutex_trylock() instead, and simply requeue the work item if we fail to grab the inode's i_mutex lock. This should speed up work queue processing in general and also prevents the following deadlock scenario: During page fault, shrink_icache_memory is called that in turn evicts another inode B. Inode B has some pending io_end work so it calls ext4_ioend_wait() that waits for inode B's i_ioend_count to become zero. However, inode B's ioend work was queued behind some of inode A's ioend work on the same cpu's ext4-dio-unwritten workqueue. As the ext4-dio-unwritten thread on that cpu is processing inode A's ioend work, it tries to grab inode A's i_mutex lock. Since the i_mutex lock of inode A is still hold before the page fault happened, we enter a deadlock. Signed-off-by: Jiaying Zhang Signed-off-by: "Theodore Ts'o" --- fs/ext4/inode.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'fs/ext4/inode.c') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index c4da98a959ae..18d2558b7624 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -121,9 +121,6 @@ void ext4_evict_inode(struct inode *inode) trace_ext4_evict_inode(inode); - mutex_lock(&inode->i_mutex); - ext4_flush_completed_IO(inode); - mutex_unlock(&inode->i_mutex); ext4_ioend_wait(inode); if (inode->i_nlink) { -- cgit v1.2.3