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io_uring/rw: don't lose partial IO result on fail 

commit 47b4c68660 upstream.

A partially done read/write may end up in io_req_complete_failed() and
loose the result, make sure we return the number of bytes processed.

Cc: stable@vger.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/05e0879c226bcd53b441bf92868eadd4bf04e2fc.1663668091.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2022-09-21 12:17:47 +01:00 committed by Greg Kroah-Hartman
parent 62e7adf96a
commit 5d690b0d79
3 changed files with 15 additions and 0 deletions
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6
io_uring/opdef.c
View File

@ -69,6 +69,7 @@ const struct io_op_def io_op_defs[] = {
.issue = io_read,
.prep_async = io_readv_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITEV] = {
.needs_file = 1,
@ -85,6 +86,7 @@ const struct io_op_def io_op_defs[] = {
.issue = io_write,
.prep_async = io_writev_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_FSYNC] = {
.needs_file = 1,
@ -105,6 +107,7 @@ const struct io_op_def io_op_defs[] = {
.name = "READ_FIXED",
.prep = io_prep_rw,
.issue = io_read,
.fail = io_rw_fail,
},
[IORING_OP_WRITE_FIXED] = {
.needs_file = 1,
@ -119,6 +122,7 @@ const struct io_op_def io_op_defs[] = {
.name = "WRITE_FIXED",
.prep = io_prep_rw,
.issue = io_write,
.fail = io_rw_fail,
},
[IORING_OP_POLL_ADD] = {
.needs_file = 1,
@ -273,6 +277,7 @@ const struct io_op_def io_op_defs[] = {
.name = "READ",
.prep = io_prep_rw,
.issue = io_read,
.fail = io_rw_fail,
},
[IORING_OP_WRITE] = {
.needs_file = 1,
@ -287,6 +292,7 @@ const struct io_op_def io_op_defs[] = {
.name = "WRITE",
.prep = io_prep_rw,
.issue = io_write,
.fail = io_rw_fail,
},
[IORING_OP_FADVISE] = {
.needs_file = 1,

8
io_uring/rw.c
View File

@ -984,6 +984,14 @@ static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx)
io_cqring_wake(ctx);
}
void io_rw_fail(struct io_kiocb *req)
{
int res;
res = io_fixup_rw_res(req, req->cqe.res);
io_req_set_res(req, res, req->cqe.flags);
}
int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin)
{
struct io_wq_work_node *pos, *start, *prev;

1
io_uring/rw.h
View File

@ -21,3 +21,4 @@ int io_readv_prep_async(struct io_kiocb *req);
int io_write(struct io_kiocb *req, unsigned int issue_flags);
int io_writev_prep_async(struct io_kiocb *req);
void io_readv_writev_cleanup(struct io_kiocb *req);
void io_rw_fail(struct io_kiocb *req);