On 04/22/2015 07:17 PM, Dave Chinner wrote:
-- Dave Chinner david@xxxxxxxxxxxxx xfs: xfs_attr_inactive leaves inconsistent attr fork state behind From: Dave Chinner<dchinner@xxxxxxxxxx> xfs_attr_inactive() is supposed to clean up the attribute fork when the inode is being freed. While it removes attribute fork extents, it completely ignores attributes in local format, which means that there can still be active attributes on the inode after xfs_attr_inactive() has run. This leads to problems with concurrent inode writeback - the in-core inode attribute fork is removed without locking on the assumption that nothing will be attempting to access the attribute fork after a call to xfs_attr_inactive() because it isn't supposed to exist on disk any more. To fix this, make xfs_attr_inactive() completely remove all traces of the attribute fork from the inode, regardless of it's state. Further, also remove the in-core attribute fork structure safely so that there is nothing further that needs to be done by callers to clean up the attribute fork. This means we can remove the in-core and on-disk attribute forks atomically. Also, on error simply remove the in-memory attribute fork. There's nothing that can be done with it once we have failed to remove the on-disk attribute fork, so we may as well just blow it away here anyway. cc:<stable@xxxxxxxxxxxxxxx> # 3.12 to 4.0 Reported-by: Waiman Long<waiman.long@xxxxxx> Signed-off-by: Dave Chinner<dchinner@xxxxxxxxxx> --- fs/xfs/libxfs/xfs_attr_leaf.c | 2 +- fs/xfs/libxfs/xfs_attr_leaf.h | 2 +- fs/xfs/xfs_attr_inactive.c | 81 ++++++++++++++++++++++++++----------------- fs/xfs/xfs_inode.c | 12 +++---- 4 files changed, 55 insertions(+), 42 deletions(-)
Thanks for figuring out a better way to fix the underlying problem. I tested it in my test machine and it did fix the errors that I had seen in my test case.
Tested-by: Waiman Long<Waiman.Long@xxxxxx> Cheers, Longman _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
