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io_uring/cancel: add generic cancel helper

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Any opcode that is cancelable ends up defining its own cancel helper
for finding and canceling a specific request. Add a generic helper that
can be used for this purpose.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2025-02-05 13:13:58 -07:00
parent 7d9944f506
commit 8fa374f90b
2 changed files with 25 additions and 0 deletions
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21
io_uring/cancel.c
View File

@ -362,3 +362,24 @@ bool io_cancel_remove_all(struct io_ring_ctx *ctx, struct io_uring_task *tctx,
return found;
}
int io_cancel_remove(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
unsigned int issue_flags, struct hlist_head *list,
bool (*cancel)(struct io_kiocb *))
{
struct hlist_node *tmp;
struct io_kiocb *req;
int nr = 0;
io_ring_submit_lock(ctx, issue_flags);
hlist_for_each_entry_safe(req, tmp, list, hash_node) {
if (!io_cancel_req_match(req, cd))
continue;
if (cancel(req))
nr++;
if (!(cd->flags & IORING_ASYNC_CANCEL_ALL))
break;
}
io_ring_submit_unlock(ctx, issue_flags);
return nr ?: -ENOENT;
}

4
io_uring/cancel.h
View File

@ -28,6 +28,10 @@ bool io_cancel_remove_all(struct io_ring_ctx *ctx, struct io_uring_task *tctx,
struct hlist_head *list, bool cancel_all,
bool (*cancel)(struct io_kiocb *));
int io_cancel_remove(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
unsigned int issue_flags, struct hlist_head *list,
bool (*cancel)(struct io_kiocb *));
static inline bool io_cancel_match_sequence(struct io_kiocb *req, int sequence)
{
if (req->cancel_seq_set && sequence == req->work.cancel_seq)