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fs: Introduce RWF_NOWAIT and FMODE_AIO_NOWAIT

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RWF_NOWAIT informs kernel to bail out if an AIO request will block
for reasons such as file allocations, or a writeback triggered,
or would block while allocating requests while performing
direct I/O.

RWF_NOWAIT is translated to IOCB_NOWAIT for iocb->ki_flags.

FMODE_AIO_NOWAIT is a flag which identifies the file opened is capable
of returning -EAGAIN if the AIO call will block. This must be set by
supporting filesystems in the ->open() call.

Filesystems xfs, btrfs and ext4 would be supported in the following patches.

Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Goldwyn Rodrigues <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Goldwyn Rodrigues 2017-06-20 07:05:43 -05:00 • committed by Jens Axboe
commit b745fafaf7
3 changed files with 18 additions and 1 deletions
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6
fs/aio.c
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@ -1592,6 +1592,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
goto out_put_req;
}
if ((req->common.ki_flags & IOCB_NOWAIT) &&
!(req->common.ki_flags & IOCB_DIRECT)) {
ret = -EOPNOTSUPP;
goto out_put_req;
}
ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
if (unlikely(ret)) {
pr_debug("EFAULT: aio_key\n");