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iomap: Allow forcing of waiting for running DIO in iomap_dio_rw()

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Filesystems do not support doing IO as asynchronous in some cases. For
example in case of unaligned writes or in case file size needs to be
extended (e.g. for ext4). Instead of forcing filesystem to wait for AIO
in such cases, add argument to iomap_dio_rw() which makes the function
wait for IO completion. This also results in executing
iomap_dio_complete() inline in iomap_dio_rw() providing its return value
to the caller as for ordinary sync IO.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Jan Kara
2019-10-15 08:43:42 -07:00
committed by Darrick J. Wong
parent 4f5cafb5cb
commit 13ef954445
4 changed files with 14 additions and 7 deletions
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3
include/linux/iomap.h
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@@ -195,7 +195,8 @@ struct iomap_dio_ops {
};
ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops, const struct iomap_dio_ops *dops);
const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
bool wait_for_completion);
int iomap_dio_iopoll(struct kiocb *kiocb, bool spin);
#ifdef CONFIG_SWAP