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lists01.pubmisc.prod.ext.phx2.redhat.com id 15H8E8ph004705 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Fri, 18 Jun 2021 03:13:11 -0400 Cc: Linux NVDIMM , Mike Snitzer , "Darrick J. Wong" , Goldwyn Rodrigues , david , Linux Kernel Mailing List , linux-xfs , Linux MM , device-mapper development , linux-fsdevel , Christoph Hellwig , Alasdair Kergon Subject: Re: [dm-devel] [PATCH v4 03/10] fs: Introduce ->corrupted_range() for superblock X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: zh-CN Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit > -----Original Message----- > From: Dan Williams > Subject: Re: [PATCH v4 03/10] fs: Introduce ->corrupted_range() for superblock > > On Wed, Jun 16, 2021 at 11:51 PM ruansy.fnst@fujitsu.com > wrote: > > > > > -----Original Message----- > > > From: Dan Williams > > > Subject: Re: [PATCH v4 03/10] fs: Introduce ->corrupted_range() for > > > superblock > > > > > > [ drop old linux-nvdimm@lists.01.org, add nvdimm@lists.linux.dev ] > > > > > > On Thu, Jun 3, 2021 at 6:19 PM Shiyang Ruan > wrote: > > > > > > > > Memory failure occurs in fsdax mode will finally be handled in > > > > filesystem. We introduce this interface to find out files or > > > > metadata affected by the corrupted range, and try to recover the > > > > corrupted data if possiable. > > > > > > > > Signed-off-by: Shiyang Ruan > > > > --- > > > > include/linux/fs.h | 2 ++ > > > > 1 file changed, 2 insertions(+) > > > > > > > > diff --git a/include/linux/fs.h b/include/linux/fs.h index > > > > c3c88fdb9b2a..92af36c4225f 100644 > > > > --- a/include/linux/fs.h > > > > +++ b/include/linux/fs.h > > > > @@ -2176,6 +2176,8 @@ struct super_operations { > > > > struct shrink_control *); > > > > long (*free_cached_objects)(struct super_block *, > > > > struct shrink_control *); > > > > + int (*corrupted_range)(struct super_block *sb, struct > > > > + block_device > > > *bdev, > > > > + loff_t offset, size_t len, void > > > > + *data); > > > > > > Why does the superblock need a new operation? Wouldn't whatever > > > function is specified here just be specified to the dax_dev as the > > > ->notify_failure() holder callback? > > > > Because we need to find out which file is effected by the given poison page so > that memory-failure code can do collect_procs() and kill_procs() jobs. And it > needs filesystem to use its rmap feature to search the file from a given offset. > So, we need this implemented by the specified filesystem and called by > dax_device's holder. > > > > This is the call trace I described in cover letter: > > memory_failure() > > * fsdax case > > pgmap->ops->memory_failure() => pmem_pgmap_memory_failure() > > dax_device->holder_ops->corrupted_range() => > > - fs_dax_corrupted_range() > > - md_dax_corrupted_range() > > sb->s_ops->currupted_range() => xfs_fs_corrupted_range() <== > **HERE** > > xfs_rmap_query_range() > > xfs_currupt_helper() > > * corrupted on metadata > > try to recover data, call xfs_force_shutdown() > > * corrupted on file data > > try to recover data, call mf_dax_kill_procs() > > * normal case > > mf_generic_kill_procs() > > > > As you can see, this new added operation is an important for the whole > progress. > > I don't think you need either fs_dax_corrupted_range() nor > sb->s_ops->corrupted_range(). In fact that fs_dax_corrupted_range() > looks broken because the filesystem may not even be mounted on the device > associated with the error. If filesystem is not mounted, then there won't be any process using the broken page and no one need to be killed in memory-failure. So, I think we can just return and handle the error on driver level if needed. > The holder_data and holder_op should be sufficient > from communicating the stack of notifications: > > pgmap->notify_memory_failure() => pmem_pgmap_notify_failure() > pmem_dax_dev->holder_ops->notify_failure(pmem_dax_dev) => > md_dax_notify_failure() > md_dax_dev->holder_ops->notify_failure() => xfs_notify_failure() > > I.e. the entire chain just walks dax_dev holder ops. Oh, I see. Just need to implement holder_ops in filesystem or mapped_device directly. I made the routine complicated. -- Thanks, Ruan. -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel