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Wong" To: Christoph Hellwig Cc: Matthew Wilcox , Goldwyn Rodrigues , Dave Chinner , Damien Le Moal , Naohiro Aota , Johannes Thumshirn , linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Michael Kerrisk , linux-man@vger.kernel.org Subject: Re: RFC: iomap write invalidation Message-ID: <20200721152754.GD7597@magnolia> References: <20200713074633.875946-1-hch@lst.de> <20200720215125.bfz7geaftocy4r5l@fiona> <20200721145313.GA9217@lst.de> <20200721150432.GH15516@casper.infradead.org> <20200721150615.GA10330@lst.de> <20200721151437.GI15516@casper.infradead.org> <20200721151616.GA11074@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200721151616.GA11074@lst.de> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9689 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 suspectscore=1 mlxscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210111 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9689 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 bulkscore=0 adultscore=0 lowpriorityscore=0 mlxlogscore=999 malwarescore=0 clxscore=1011 spamscore=0 mlxscore=0 impostorscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210111 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Tue, Jul 21, 2020 at 05:16:16PM +0200, Christoph Hellwig wrote: > On Tue, Jul 21, 2020 at 04:14:37PM +0100, Matthew Wilcox wrote: > > On Tue, Jul 21, 2020 at 05:06:15PM +0200, Christoph Hellwig wrote: > > > On Tue, Jul 21, 2020 at 04:04:32PM +0100, Matthew Wilcox wrote: > > > > I thought you were going to respin this with EREMCHG changed to ENOTBLK? > > > > > > Oh, true. I'll do that ASAP. > > > > Michael, could we add this to manpages? > > Umm, no. -ENOTBLK is internal - the file systems will retry using > buffered I/O and the error shall never escape to userspace (or even the > VFS for that matter). It's worth dropping a comment somewhere that ENOTBLK is the desired "fall back to buffered" errcode, seeing as Dave and I missed that in XFS... --D