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io_uring: punt splice async because of inode mutex 

Nonblocking do_splice() still may wait for some time on an inode mutex.
Let's play safe and always punt it async.

Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-05-01 17:09:38 +03:00 committed by Jens Axboe
parent 4ee3631451
commit 2fb3e82284
1 changed files with 2 additions and 14 deletions
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16
fs/io_uring.c
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@ -2768,15 +2768,6 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return 0;
}
static bool io_splice_punt(struct file *file, int rw)
{
if (get_pipe_info(file))
return false;
if (!io_file_supports_async(file, rw))
return true;
return !(file->f_flags & O_NONBLOCK);
}
static int io_splice(struct io_kiocb *req, bool force_nonblock)
{
struct io_splice *sp = &req->splice;
@ -2786,11 +2777,8 @@ static int io_splice(struct io_kiocb *req, bool force_nonblock)
loff_t *poff_in, *poff_out;
long ret;
if (force_nonblock) {
if (io_splice_punt(in, READ) || io_splice_punt(out, WRITE))
return -EAGAIN;
flags |= SPLICE_F_NONBLOCK;
}
if (force_nonblock)
return -EAGAIN;
poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;