From: Andreas Gruenbacher <agruenba@redhat.com> To: Christoph Hellwig <hch@infradead.org>, "Darrick J. Wong" <darrick.wong@oracle.com> Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, cluster-devel@redhat.com, Andreas Gruenbacher <agruenba@redhat.com> Subject: [PATCH] iomap: Fix direct I/O write consistency check Date: Thu, 3 Sep 2020 18:56:32 +0200 [thread overview] Message-ID: <20200903165632.1338996-1-agruenba@redhat.com> (raw) When a direct I/O write falls back to buffered I/O entirely, dio->size will be 0 in iomap_dio_complete. Function invalidate_inode_pages2_range will try to invalidate the rest of the address space. If there are any dirty pages in that range, the write will fail and a "Page cache invalidation failure on direct I/O" error will be logged. On gfs2, this can be reproduced as follows: xfs_io \ -c "open -ft foo" -c "pwrite 4k 4k" -c "close" \ -c "open -d foo" -c "pwrite 0 4k" Fix this by recognizing 0-length writes. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> --- fs/iomap/direct-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index c1aafb2ab990..c9d6b4eecdb7 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -108,7 +108,7 @@ static ssize_t iomap_dio_complete(struct iomap_dio *dio) * ->end_io() when necessary, otherwise a racing buffer read would cache * zeros from unwritten extents. */ - if (!dio->error && + if (!dio->error && dio->size && (dio->flags & IOMAP_DIO_WRITE) && inode->i_mapping->nrpages) { int err; err = invalidate_inode_pages2_range(inode->i_mapping, -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Andreas Gruenbacher <agruenba@redhat.com> To: cluster-devel.redhat.com Subject: [Cluster-devel] [PATCH] iomap: Fix direct I/O write consistency check Date: Thu, 3 Sep 2020 18:56:32 +0200 [thread overview] Message-ID: <20200903165632.1338996-1-agruenba@redhat.com> (raw) When a direct I/O write falls back to buffered I/O entirely, dio->size will be 0 in iomap_dio_complete. Function invalidate_inode_pages2_range will try to invalidate the rest of the address space. If there are any dirty pages in that range, the write will fail and a "Page cache invalidation failure on direct I/O" error will be logged. On gfs2, this can be reproduced as follows: xfs_io \ -c "open -ft foo" -c "pwrite 4k 4k" -c "close" \ -c "open -d foo" -c "pwrite 0 4k" Fix this by recognizing 0-length writes. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> --- fs/iomap/direct-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index c1aafb2ab990..c9d6b4eecdb7 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -108,7 +108,7 @@ static ssize_t iomap_dio_complete(struct iomap_dio *dio) * ->end_io() when necessary, otherwise a racing buffer read would cache * zeros from unwritten extents. */ - if (!dio->error && + if (!dio->error && dio->size && (dio->flags & IOMAP_DIO_WRITE) && inode->i_mapping->nrpages) { int err; err = invalidate_inode_pages2_range(inode->i_mapping, -- 2.26.2
next reply other threads:[~2020-09-03 16:56 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-09-03 16:56 Andreas Gruenbacher [this message] 2020-09-03 16:56 ` [Cluster-devel] [PATCH] iomap: Fix direct I/O write consistency check Andreas Gruenbacher 2020-09-03 21:12 ` Eric Sandeen 2020-09-03 21:12 ` [Cluster-devel] " Eric Sandeen 2020-09-03 21:47 ` Andreas Gruenbacher 2020-09-03 21:47 ` [Cluster-devel] " Andreas Gruenbacher 2020-09-07 7:07 ` Christoph Hellwig 2020-09-07 7:07 ` [Cluster-devel] " Christoph Hellwig
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