From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: Announce: unlimited number of shared snapshots Date: Tue, 2 Dec 2008 02:34:43 -0500 Message-ID: <20081202073443.GA22985@infradead.org> References: <492FAF1C.8080401@gluesys.com> <4933684F.9060606@gluesys.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Mikulas Patocka Cc: dm-devel@redhat.com, hgichon List-Id: dm-devel.ids On Tue, Dec 02, 2008 at 02:05:28AM -0500, Mikulas Patocka wrote: > Hi > > I fixed the ext2 bug (it was unsupported handling of buffer readahead) --- > download the new version of patches from the same location. > > I couldn't reproduce the XFS bug. Please retry. Are you sure that you > didn't try to mount the _snapshot_ as XFS? Snapshots are currently not > writeable (they will be writeable in the final version), so attempting to > mount the snapshot read/write would return i/o error to the filesystem and > produce an error message similar to the one displayed. The error message definitively looks like trying to mount a r/o snapshots without -o ro,norecovery: > > fs/xfs/xfs_rw.c. Return address = 0xffffffff8037d399 > > [ 2696.363710] Filesystem "dm-3": I/O Error Detected. Shutting down > > filesystem: dm-3 > > [ 2696.368085] Please umount the filesystem, and rectify the problem(s) > > [ 2696.371756] I/O error in filesystem ("dm-3") meta-data dev dm-3 block > > 0x200022 ("xlog_bwrite") error 5 buf count 2097152 > > [ 2696.378402] XFS: failed to locate log tail > > [ 2696.380797] XFS: log mount/recovery failed: error 5 > > [ 2696.405586] XFS: log mount failed