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io_uring-5.9-2020-09-04

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Merge tag 'io_uring-5.9-2020-09-04' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - EAGAIN with O_NONBLOCK retry fix

 - Two small fixes for registered files (Jiufei)

* tag 'io_uring-5.9-2020-09-04' of git://git.kernel.dk/linux-block:
  io_uring: no read/write-retry on -EAGAIN error and O_NONBLOCK marked file
  io_uring: set table->files[i] to NULL when io_sqe_file_register failed
  io_uring: fix removing the wrong file in __io_sqe_files_update()
This commit is contained in:
Linus Torvalds 2020-09-04 12:55:22 -07:00
commit d849ca483d
1 changed files with 12 additions and 1 deletions
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13
fs/io_uring.c
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@ -2300,8 +2300,11 @@ end_req:
static bool io_rw_reissue(struct io_kiocb *req, long res)
{
#ifdef CONFIG_BLOCK
umode_t mode = file_inode(req->file)->i_mode;
int ret;
if (!S_ISBLK(mode) && !S_ISREG(mode))
return false;
if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
return false;
@ -3146,6 +3149,9 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
/* IOPOLL retry should happen for io-wq threads */
if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL))
goto done;
/* no retry on NONBLOCK marked file */
if (req->file->f_flags & O_NONBLOCK)
goto done;
/* some cases will consume bytes even on error returns */
iov_iter_revert(iter, iov_count - iov_iter_count(iter));
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
@ -3287,10 +3293,14 @@ static int io_write(struct io_kiocb *req, bool force_nonblock,
*/
if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT))
ret2 = -EAGAIN;
/* no retry on NONBLOCK marked file */
if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK))
goto done;
if (!force_nonblock || ret2 != -EAGAIN) {
/* IOPOLL retry should happen for io-wq threads */
if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN)
goto copy_iov;
done:
kiocb_done(kiocb, ret2, cs);
} else {
copy_iov:
@ -7324,7 +7334,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
if (table->files[index]) {
file = io_file_from_index(ctx, index);
file = table->files[index];
err = io_queue_file_removal(data, file);
if (err)
break;
@ -7353,6 +7363,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
table->files[index] = file;
err = io_sqe_file_register(ctx, file, i);
if (err) {
table->files[index] = NULL;
fput(file);
break;
}