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io_uring: abstract out a io_poll_find_helper()

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We'll need this helper for another purpose, for now just abstract it
out and have io_poll_cancel() use it for lookups.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-03-17 08:17:19 -06:00
parent 5082620fb2
commit b2cb805f6d
1 changed files with 16 additions and 5 deletions
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21
fs/io_uring.c
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@ -5286,7 +5286,7 @@ static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
return posted != 0;
}
static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr)
{
struct hlist_head *list;
struct io_kiocb *req;
@ -5295,12 +5295,23 @@ static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
hlist_for_each_entry(req, list, hash_node) {
if (sqe_addr != req->user_data)
continue;
if (io_poll_remove_one(req))
return 0;
return -EALREADY;
return req;
}
return -ENOENT;
return NULL;
}
static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
{
struct io_kiocb *req;
req = io_poll_find(ctx, sqe_addr);
if (!req)
return -ENOENT;
if (io_poll_remove_one(req))
return 0;
return -EALREADY;
}
static int io_poll_remove_prep(struct io_kiocb *req,