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| author |   Andreas Gruenbacher <agruenba@redhat.com> | 2020-09-10 08:26:16 -0700 |
|---|---|---|
| committer |   Darrick J. Wong <darrick.wong@oracle.com> | 2020-09-10 08:26:16 -0700 |
| commit | c114bbc6c423a449a00780d2d6633432c0a0505f (patch) | |
| tree | 45410f7b3d7fe4e360785639699d6e2afdad1387 /fs/iomap/direct-io.c | |
| parent | iomap: fix WARN_ON_ONCE() from unprivileged users (diff) | |
| download | wireguard-linux-c114bbc6c423a449a00780d2d6633432c0a0505f.tar.xz wireguard-linux-c114bbc6c423a449a00780d2d6633432c0a0505f.zip | |
iomap: Fix direct I/O write consistency check
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>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/iomap/direct-io.c')
| -rw-r--r-- | fs/iomap/direct-io.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 9519113ebc35..024d4bb3028e 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, |