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io_uring: don't attempt to copy iovec for READ/WRITE

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For the non-vectored variant of READV/WRITEV, we don't need to setup an
async io context, and we flag that appropriately in the io_op_defs
array. However, in fixing this for the 5.5 kernel in commit 74566df3a71c
we didn't have these opcodes, so the check there was added just for the
READ_FIXED and WRITE_FIXED opcodes. Replace that check with just a
single check for needing async context, that covers all four of these
read/write variants that don't use an iovec.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-01-24 23:08:54 -07:00
parent 86a761f81e
commit 980ad26304
1 changed files with 1 additions and 2 deletions
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3
fs/io_uring.c
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@ -2112,8 +2112,7 @@ static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size,
struct iovec *iovec, struct iovec *fast_iov,
struct iov_iter *iter)
{
if (req->opcode == IORING_OP_READ_FIXED ||
req->opcode == IORING_OP_WRITE_FIXED)
if (!io_op_defs[req->opcode].async_ctx)
return 0;
if (!req->io && io_alloc_async_ctx(req))
return -ENOMEM;