From: Miklos Szeredi <mszeredi@suse.cz>
Date: Fri, 25 Feb 2011 13:44:58 +0000 (+0100)
Subject: fuse: fix hang of single threaded fuseblk filesystem
X-Git-Tag: v2.6.37.3~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca3edc920f5fd7d8ac040caaf109f925c24620a0;p=pandora-kernel.git

fuse: fix hang of single threaded fuseblk filesystem

commit 5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 upstream.

Single threaded NTFS-3G could get stuck if a delayed RELEASE reply
triggered a DESTROY request via path_put().

Fix this by

 a) making RELEASE requests synchronous, whenever possible, on fuseblk
 filesystems

 b) if not possible (triggered by an asynchronous read/write) then do
 the path_put() in a separate thread with schedule_work().

Reported-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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