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io_uring: enable poll retry for any file with ->read_iter / ->write_iter 

We can have files like eventfd where it's perfectly fine to do poll
based retry on them, right now io_file_supports_async() doesn't take
that into account.

Pass in data direction and check the f_op instead of just always needing
an async worker.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-04-28 13:15:06 -06:00
parent 5b0bbee473
commit af197f50ac
1 changed files with 13 additions and 7 deletions
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20
fs/io_uring.c
View File

@ -2038,7 +2038,7 @@ static struct file *__io_file_get(struct io_submit_state *state, int fd)
* any file. For now, just ensure that anything potentially problematic is done
* inline.
*/
static bool io_file_supports_async(struct file *file)
static bool io_file_supports_async(struct file *file, int rw)
{
umode_t mode = file_inode(file)->i_mode;
@ -2047,7 +2047,13 @@ static bool io_file_supports_async(struct file *file)
if (S_ISREG(mode) && file->f_op != &io_uring_fops)
return true;
return false;
if (!(file->f_mode & FMODE_NOWAIT))
return false;
if (rw == READ)
return file->f_op->read_iter != NULL;
return file->f_op->write_iter != NULL;
}
static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
@ -2575,7 +2581,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock)
* If the file doesn't support async, mark it as REQ_F_MUST_PUNT so
* we know to async punt it even if it was opened O_NONBLOCK
*/
if (force_nonblock && !io_file_supports_async(req->file))
if (force_nonblock && !io_file_supports_async(req->file, READ))
goto copy_iov;
iov_count = iov_iter_count(&iter);
@ -2666,7 +2672,7 @@ static int io_write(struct io_kiocb *req, bool force_nonblock)
* If the file doesn't support async, mark it as REQ_F_MUST_PUNT so
* we know to async punt it even if it was opened O_NONBLOCK
*/
if (force_nonblock && !io_file_supports_async(req->file))
if (force_nonblock && !io_file_supports_async(req->file, WRITE))
goto copy_iov;
/* file path doesn't support NOWAIT for non-direct_IO */
@ -2760,11 +2766,11 @@ 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)
static bool io_splice_punt(struct file *file, int rw)
{
if (get_pipe_info(file))
return false;
if (!io_file_supports_async(file))
if (!io_file_supports_async(file, rw))
return true;
return !(file->f_flags & O_NONBLOCK);
}
@ -2779,7 +2785,7 @@ static int io_splice(struct io_kiocb *req, bool force_nonblock)
long ret;
if (force_nonblock) {
if (io_splice_punt(in) || io_splice_punt(out))
if (io_splice_punt(in, READ) || io_splice_punt(out, WRITE))
return -EAGAIN;
flags |= SPLICE_F_NONBLOCK;
}