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io_uring/cmd: add per-op data to struct io_uring_cmd_data

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In case an op handler for ->uring_cmd() needs stable storage for user
data, it can allocate io_uring_cmd_data->op_data and use it for the
duration of the request. When the request gets cleaned up, uring_cmd
will free it automatically.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jens Axboe 2025-01-03 15:02:24 +00:00 committed by David Sterba
parent dadf03cfd4
commit 3347fa658a
2 changed files with 12 additions and 2 deletions
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1
include/linux/io_uring/cmd.h
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@ -20,6 +20,7 @@ struct io_uring_cmd {
struct io_uring_cmd_data {
struct io_uring_sqe sqes[2];
void *op_data;
};
static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe)

13
io_uring/uring_cmd.c
View File

@ -23,12 +23,16 @@ static struct io_uring_cmd_data *io_uring_async_get(struct io_kiocb *req)
cache = io_alloc_cache_get(&ctx->uring_cache);
if (cache) {
cache->op_data = NULL;
req->flags |= REQ_F_ASYNC_DATA;
req->async_data = cache;
return cache;
}
if (!io_alloc_async_data(req))
return req->async_data;
if (!io_alloc_async_data(req)) {
cache = req->async_data;
cache->op_data = NULL;
return cache;
}
return NULL;
}
@ -37,6 +41,11 @@ static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
struct io_uring_cmd_data *cache = req->async_data;
if (cache->op_data) {
kfree(cache->op_data);
cache->op_data = NULL;
}
if (issue_flags & IO_URING_F_UNLOCKED)
return;
if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {