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Benjamin Marzinski d668f92bf3 GFS2: Test bufdata with buffer locked and gfs2_log_lock held 
commit 96e5d1d3ad upstream.

In gfs2_trans_add_bh(), gfs2 was testing if a there was a bd attached to the
buffer without having the gfs2_log_lock held. It was then assuming it would
stay attached for the rest of the function. However, without either the log
lock being held of the buffer locked, __gfs2_ail_flush() could detach bd at any
time.  This patch moves the locking before the test.  If there isn't a bd
already attached, gfs2 can safely allocate one and attach it before locking.
There is no way that the newly allocated bd could be on the ail list,
and thus no way for __gfs2_ail_flush() to detach it.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2013-01-17 08:44:12 -08:00
..
acl.c GFS2: Post-VFS scale update for RCU path walk 2011-01-21 09:39:24 +00:00
acl.h fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
aops.c GFS2: Resolve inode eviction and ail list interaction bug 2011-07-14 08:59:44 +01:00
bmap.c GFS2: Wipe directory hash table metadata when deallocating a directory 2011-05-21 14:05:58 +01:00
bmap.h GFS2: New truncate sequence 2010-09-20 11:18:16 +01:00
dentry.c gfs2: fix d_revalidate oopsen on NFS exports 2011-03-10 03:44:48 -05:00
dir.c GFS2: When adding a new dir entry, inc link count if it is a subdir 2011-05-09 16:43:53 +01:00
dir.h GFS2: When adding a new dir entry, inc link count if it is a subdir 2011-05-09 16:43:53 +01:00
export.c tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-21 09:17:10 -07:00
file.c GFS2: make sure fallocate bytes is a multiple of blksize 2011-05-03 11:47:42 +01:00
gfs2.h
glock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-fixes 2011-06-07 18:44:10 -07:00
glock.h GFS2: Alter point of entry to glock lru list for glocks with an address_space 2011-04-20 08:59:48 +01:00
glops.c GFS2: Resolve inode eviction and ail list interaction bug 2011-07-14 08:59:44 +01:00
glops.h GFS2: Clean up fsync() 2011-04-20 09:00:41 +01:00
incore.h GFS2: Fix race during filesystem mount 2011-07-12 09:15:46 +01:00
inode.c GFS2: Move all locking inside the inode creation function 2011-05-13 12:11:17 +01:00
inode.h GFS2: Clean up symlink creation 2011-05-13 10:34:59 +01:00
Kconfig GFS2: No longer experimental 2010-09-20 11:18:46 +01:00
lock_dlm.c GFS2: Fix glock deallocation race 2011-03-09 10:58:04 +00:00
log.c GFS2: Resolve inode eviction and ail list interaction bug 2011-07-14 08:59:44 +01:00
log.h GFS2: Make writeback more responsive to system conditions 2011-04-20 09:01:37 +01:00
lops.c GFS2: Test bufdata with buffer locked and gfs2_log_lock held 2013-01-17 08:44:12 -08:00
lops.h
main.c Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2011-05-26 13:19:00 -07:00
Makefile GFS2: Rename ops_inode.c to inode.c 2011-05-10 13:12:49 +01:00
meta_io.c GFS2: Improve tracing support (adds two flags) 2011-04-20 09:00:59 +01:00
meta_io.h GFS2: Remove unused macro 2011-04-20 09:00:24 +01:00
ops_fstype.c GFS2: Fix mount hang caused by certain access pattern to sysfs files 2011-08-04 21:58:42 -07:00
quota.c vmscan: change shrinker API by passing shrink_control struct 2011-05-25 08:39:26 -07:00
quota.h vmscan: change shrinker API by passing shrink_control struct 2011-05-25 08:39:26 -07:00
recovery.c GFS2: Fix spectator umount issue 2010-09-29 14:20:52 +01:00
recovery.h gfs2: use workqueue instead of slow-work 2010-07-23 13:14:25 +02:00
rgrp.c GFS2: Wipe directory hash table metadata when deallocating a directory 2011-05-21 14:05:58 +01:00
rgrp.h GFS2: deallocation performance patch 2011-02-24 12:13:48 +00:00
super.c GFS2: Resolve inode eviction and ail list interaction bug 2011-07-14 08:59:44 +01:00
super.h gfs: constify xattr_handler 2010-05-21 18:31:20 -04:00
sys.c GFS2: Fix race during filesystem mount 2011-07-12 09:15:46 +01:00
sys.h GFS2: Remove ancient, unused code 2009-01-05 07:39:13 +00:00
trace_gfs2.h GFS2: Add an AIL writeback tracepoint 2011-04-20 09:01:58 +01:00
trans.c GFS2: Test bufdata with buffer locked and gfs2_log_lock held 2013-01-17 08:44:12 -08:00
trans.h GFS2: reserve more blocks for transactions 2010-09-28 09:44:24 +01:00
util.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
util.h GFS2: Metadata address space clean up 2010-03-01 14:07:37 +00:00
xattr.c GFS2: Clean up duplicated setattr code 2010-11-30 10:30:19 +00:00
xattr.h sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00