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>
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@ -485,6 +485,13 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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iomap_flags |= IOMAP_NOWAIT;
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iomap_flags |= IOMAP_NOWAIT;
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}
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}
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if (dio_flags & IOMAP_DIO_OVERWRITE_ONLY) {
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ret = -EAGAIN;
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if (pos >= dio->i_size || pos + count > dio->i_size)
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goto out_free_dio;
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iomap_flags |= IOMAP_OVERWRITE_ONLY;
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}
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ret = filemap_write_and_wait_range(mapping, pos, end);
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ret = filemap_write_and_wait_range(mapping, pos, end);
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if (ret)
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if (ret)
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goto out_free_dio;
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goto out_free_dio;
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@ -122,6 +122,7 @@ struct iomap_page_ops {
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#define IOMAP_FAULT (1 << 3) /* mapping for page fault */
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#define IOMAP_FAULT (1 << 3) /* mapping for page fault */
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#define IOMAP_DIRECT (1 << 4) /* direct I/O */
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#define IOMAP_DIRECT (1 << 4) /* direct I/O */
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#define IOMAP_NOWAIT (1 << 5) /* do not block */
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#define IOMAP_NOWAIT (1 << 5) /* do not block */
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#define IOMAP_OVERWRITE_ONLY (1 << 6) /* only pure overwrites allowed */
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struct iomap_ops {
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struct iomap_ops {
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/*
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/*
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@ -262,6 +263,13 @@ struct iomap_dio_ops {
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*/
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*/
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#define IOMAP_DIO_FORCE_WAIT (1 << 0)
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#define IOMAP_DIO_FORCE_WAIT (1 << 0)
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/*
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* Do not allocate blocks or zero partial blocks, but instead fall back to
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* the caller by returning -EAGAIN. Used to optimize direct I/O writes that
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* are not aligned to the file system block size.
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*/
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#define IOMAP_DIO_OVERWRITE_ONLY (1 << 1)
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ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
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const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
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unsigned int dio_flags);
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unsigned int dio_flags);
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