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| author | Christoph Hellwig <hch@lst.de> | 2021-01-23 10:06:10 -0800 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-01-23 10:22:12 -0800 |
| commit | 213f627104daf8589aad8ee73fcaeb603ab0af15 (patch) | |
| tree | 78077f4f6fd6915e09d9c3aba35c7214ae9583f8 /fs/iomap/direct-io.c | |
| parent | 2f63296578cad1ae681152d5b2122a4595195f16 (diff) | |
| download | lwn-213f627104daf8589aad8ee73fcaeb603ab0af15.tar.gz lwn-213f627104daf8589aad8ee73fcaeb603ab0af15.zip | |
iomap: add a IOMAP_DIO_OVERWRITE_ONLY flag
Add a flag to signal that only pure overwrites are allowed.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/iomap/direct-io.c')
| -rw-r--r-- | fs/iomap/direct-io.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 947343730e2c..65d32364345d 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -485,6 +485,13 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, iomap_flags |= IOMAP_NOWAIT; } + if (dio_flags & IOMAP_DIO_OVERWRITE_ONLY) { + ret = -EAGAIN; + if (pos >= dio->i_size || pos + count > dio->i_size) + goto out_free_dio; + iomap_flags |= IOMAP_OVERWRITE_ONLY; + } + ret = filemap_write_and_wait_range(mapping, pos, end); if (ret) goto out_free_dio; |