[PATCH] (ac only) quota deadlocks on unmount

[Chris Mason <mason@suse.com>]

Hello everyone,

Alan, you're cc'd as an FYI, don't apply this until you get
verification from someone who knows the quota code ;-)

dqput_blocks can return 0 when dqput might decide to call
commit_dqout.  This is bad because remove_inode_dquot_ref
is called with the inode_lock held, and commit_dquot can
trigger schedules or another attempt on the inode_lock.

This is working for me:

-chris

Index: 0.43/fs/dquot.c
--- 0.43/fs/dquot.c Mon, 15 Oct 2001 03:51:05 -0400
+++ 0.43(w)/fs/dquot.c Mon, 15 Oct 2001 14:12:57 -0400
@@ -1246,6 +1246,8 @@
 {
 	if (dquot->dq_dup_ref && dquot->dq_count - dquot->dq_dup_ref <= 1)
 		return 1;
+	if (dquot->dq_count <= 1 && dquot->dq_flags & DQ_MOD) 
+		return 1; 
 	return 0;
 }