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ublk: remove ublk_commit_and_fetch()

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Remove ublk_commit_and_fetch() and open code request completion.

Consolidate accesses to struct ublk_io in UBLK_IO_COMMIT_AND_FETCH_REQ. When
the ublk_io daemon task restriction is relaxed in the future, ublk_io will
need to be protected by a lock. Unregister the auto-registered buffer and
complete the request last, as these don't need to happen under the lock.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250713143415.2857561-10-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2025-07-13 22:34:04 +08:00 committed by Jens Axboe
parent 3446583f81
commit b749965edd
1 changed files with 18 additions and 18 deletions
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36
drivers/block/ublk_drv.c
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@ -714,13 +714,12 @@ static inline void ublk_put_req_ref(struct ublk_io *io, struct request *req)
__ublk_complete_rq(req);
}
static inline void ublk_sub_req_ref(struct ublk_io *io, struct request *req)
static inline bool ublk_sub_req_ref(struct ublk_io *io, struct request *req)
{
unsigned sub_refs = UBLK_REFCOUNT_INIT - io->task_registered_buffers;
io->task_registered_buffers = 0;
if (refcount_sub_and_test(sub_refs, &io->ref))
__ublk_complete_rq(req);
return refcount_sub_and_test(sub_refs, &io->ref);
}
static inline bool ublk_need_get_data(const struct ublk_queue *ubq)
@ -2243,21 +2242,13 @@ static int ublk_check_commit_and_fetch(const struct ublk_queue *ubq,
return 0;
}
static void ublk_commit_and_fetch(const struct ublk_queue *ubq,
struct ublk_io *io, struct io_uring_cmd *cmd,
struct request *req, unsigned int issue_flags,
__u64 zone_append_lba, u16 buf_idx)
static bool ublk_need_complete_req(const struct ublk_queue *ubq,
struct ublk_io *io,
struct request *req)
{
if (buf_idx != UBLK_INVALID_BUF_IDX)
io_buffer_unregister_bvec(cmd, buf_idx, issue_flags);
if (req_op(req) == REQ_OP_ZONE_APPEND)
req->__sector = zone_append_lba;
if (ublk_need_req_ref(ubq))
ublk_sub_req_ref(io, req);
else
__ublk_complete_rq(req);
return ublk_sub_req_ref(io, req);
return true;
}
static bool ublk_get_data(const struct ublk_queue *ubq, struct ublk_io *io,
@ -2290,6 +2281,7 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
unsigned tag = ub_cmd->tag;
struct request *req;
int ret;
bool compl;
pr_devel("%s: received: cmd op %d queue %d tag %d result %d\n",
__func__, cmd->cmd_op, ub_cmd->q_id, tag,
@ -2367,8 +2359,16 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
io->res = ub_cmd->result;
req = ublk_fill_io_cmd(io, cmd);
ret = ublk_config_io_buf(ubq, io, cmd, ub_cmd->addr, &buf_idx);
ublk_commit_and_fetch(ubq, io, cmd, req, issue_flags,
ub_cmd->zone_append_lba, buf_idx);
compl = ublk_need_complete_req(ubq, io, req);
/* can't touch 'ublk_io' any more */
if (buf_idx != UBLK_INVALID_BUF_IDX)
io_buffer_unregister_bvec(cmd, buf_idx, issue_flags);
if (req_op(req) == REQ_OP_ZONE_APPEND)
req->__sector = ub_cmd->zone_append_lba;
if (compl)
__ublk_complete_rq(req);
if (ret)
goto out;
break;