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io_uring: move provided and fixed buffers into the same io_kiocb area

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These are mutually exclusive - if you use provided buffers, then you
cannot use fixed buffers and vice versa. Move them into the same spot
in the io_kiocb, which is also advantageous for provided buffers as
they get near the submit side hot cacheline.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-04-30 14:35:17 -06:00
parent 149c69b04a
commit a4f8d94cfb
1 changed files with 8 additions and 4 deletions
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12
fs/io_uring.c
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@ -958,8 +958,14 @@ struct io_kiocb {
struct task_struct *task;
struct io_rsrc_node *rsrc_node;
/* store used ubuf, so we can prevent reloading */
struct io_mapped_ubuf *imu;
union {
/* store used ubuf, so we can prevent reloading */
struct io_mapped_ubuf *imu;
/* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */
struct io_buffer *kbuf;
};
union {
/* used by request caches, completion batching and iopoll */
@ -976,8 +982,6 @@ struct io_kiocb {
struct async_poll *apoll;
/* opcode allocated if it needs to store data for async defer */
void *async_data;
/* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */
struct io_buffer *kbuf;
/* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */
struct io_kiocb *link;
/* custom credentials, valid IFF REQ_F_CREDS is set */