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io_uring: extract io_put_kbuf() helper 

Extract a common helper for cleaning up a selected buffer, this will be
used shortly. By the way, correct cflags types to unsigned and, as kbufs
are anyway tracked by a flag, remove useless zeroing req->rw.addr.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-07-16 23:28:04 +03:00 committed by Jens Axboe
parent bc02ef3325
commit 8ff069bf2e
1 changed files with 12 additions and 7 deletions
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19
fs/io_uring.c
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@ -1922,20 +1922,25 @@ static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
}
static int io_put_kbuf(struct io_kiocb *req)
static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf)
{
struct io_buffer *kbuf;
int cflags;
unsigned int cflags;
kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT;
cflags |= IORING_CQE_F_BUFFER;
req->rw.addr = 0;
req->flags &= ~REQ_F_BUFFER_SELECTED;
kfree(kbuf);
return cflags;
}
static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
{
struct io_buffer *kbuf;
kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
return io_put_kbuf(req, kbuf);
}
static inline bool io_run_task_work(void)
{
if (current->task_works) {
@ -1985,7 +1990,7 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
list_del(&req->inflight_entry);
if (req->flags & REQ_F_BUFFER_SELECTED)
cflags = io_put_kbuf(req);
cflags = io_put_rw_kbuf(req);
__io_cqring_fill_event(req, req->result, cflags);
(*nr_events)++;
@ -2177,7 +2182,7 @@ static void io_complete_rw_common(struct kiocb *kiocb, long res,
if (res != req->result)
req_set_fail_links(req);
if (req->flags & REQ_F_BUFFER_SELECTED)
cflags = io_put_kbuf(req);
cflags = io_put_rw_kbuf(req);
__io_req_complete(req, res, cflags, cs);
}