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io_uring/rw: mark readv/writev as vectored in the opcode definition 

This is cleaner than gating on the opcode type, particularly as more
read/write type opcodes may be added.

Then we can use that for the data import, and for __io_read() on
whether or not we need to copy state.

Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-09-11 13:46:07 -06:00
parent a08d195b58
commit d2d778fbf9
3 changed files with 10 additions and 4 deletions
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2
io_uring/opdef.c
View File

@ -63,6 +63,7 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.vectored = 1,
.prep = io_prep_rw,
.issue = io_read,
},
@ -76,6 +77,7 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.vectored = 1,
.prep = io_prep_rw,
.issue = io_write,
},

2
io_uring/opdef.h
View File

@ -29,6 +29,8 @@ struct io_issue_def {
unsigned iopoll_queue : 1;
/* opcode specific path will handle ->async_data allocation if needed */
unsigned manual_alloc : 1;
/* vectored opcode, set if 1) vectored, and 2) handler needs to know */
unsigned vectored : 1;
int (*issue)(struct io_kiocb *, unsigned int);
int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);

10
io_uring/rw.c
View File

@ -388,8 +388,7 @@ static struct iovec *__io_import_iovec(int ddir, struct io_kiocb *req,
buf = u64_to_user_ptr(rw->addr);
sqe_len = rw->len;
if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE ||
(req->flags & REQ_F_BUFFER_SELECT)) {
if (!io_issue_defs[opcode].vectored || req->flags & REQ_F_BUFFER_SELECT) {
if (io_do_buffer_select(req)) {
buf = io_buffer_select(req, &sqe_len, issue_flags);
if (!buf)
@ -776,8 +775,11 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags)
if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) {
req->flags &= ~REQ_F_REISSUE;
/* if we can poll, just do that */
if (req->opcode == IORING_OP_READ && file_can_poll(req->file))
/*
* If we can poll, just do that. For a vectored read, we'll
* need to copy state first.
*/
if (file_can_poll(req->file) && !io_issue_defs[req->opcode].vectored)
return -EAGAIN;
/* IOPOLL retry should happen for io-wq threads */
if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL))