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fs: support RWF_NOWAIT for buffered reads

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This is based on the old idea and code from Milosz Tanski.  With the aio
nowait code it becomes mostly trivial now.  Buffered writes continue to
return -EOPNOTSUPP if RWF_NOWAIT is passed.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-08-29 16:13:20 +02:00 • committed by Al Viro
commit 91f9943e1c
5 changed files with 20 additions and 15 deletions
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6
fs/aio.c
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@ -1593,12 +1593,6 @@ 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");