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Wong" Cc: Carlos Maiolino , Christian Brauner , Jan Kara , "Martin K. Petersen" , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-raid@vger.kernel.org, linux-block@vger.kernel.org Date: Tue, 04 Nov 2025 17:34:50 +0530 In-Reply-To: <20251029163708.GC26985@lst.de> References: <20251029071537.1127397-1-hch@lst.de> <20251029071537.1127397-3-hch@lst.de> <20251029160101.GE3356773@frogsfrogsfrogs> <20251029163708.GC26985@lst.de> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.5 (3.28.5-27.el8_10) Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: 7bit On Wed, 2025-10-29 at 17:37 +0100, Christoph Hellwig wrote: > On Wed, Oct 29, 2025 at 09:01:01AM -0700, Darrick J. Wong wrote: > > Hum. So we kick writeback but don't wait for any of it to start, and > > immediately sample wberr. Does that mean that in the "bdev died" case, > > the newly initiated writeback will have failed so quickly that > > file_check_and_advance_wb_err will see that? > > Yes, this is primarily about catching errors in the submission path > before it reaches the device, which are returned synchronously. So, what you are saying is file_check_and_advance_wb_err() will wait/block till the write back request done in filemap_fdatawrite_range_kick() is completely submitted and there are no more chances of write back failure? --NR > > > Or are we only reflecting > > past write failures back to userspace on the *second* write after the > > device dies? > > > > It would be helpful to know which fstests break, btw. > > generic/252 generic/329 xfs/237 >