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block/io_uring: pass in issue_flags for uring_cmd task_work handling
io_uring_cmd_done() currently assumes that the uring_lock is held
when invoked, and while it generally is, this is not guaranteed.
Pass in the issue_flags associated with it, so that we have
IO_URING_F_UNLOCKED available to be able to lock the CQ ring
appropriately when completing events.
Cc: stable@vger.kernel.org
Fixes: ee692a21e9
("fs,io_uring: add infrastructure for uring-cmd")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
4985e7b2c0
commit
9d2789ac9d
@ -715,7 +715,8 @@ static void __ublk_fail_req(struct ublk_queue *ubq, struct ublk_io *io,
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}
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}
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static void ubq_complete_io_cmd(struct ublk_io *io, int res)
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static void ubq_complete_io_cmd(struct ublk_io *io, int res,
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unsigned issue_flags)
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{
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/* mark this cmd owned by ublksrv */
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io->flags |= UBLK_IO_FLAG_OWNED_BY_SRV;
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@ -727,7 +728,7 @@ static void ubq_complete_io_cmd(struct ublk_io *io, int res)
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io->flags &= ~UBLK_IO_FLAG_ACTIVE;
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/* tell ublksrv one io request is coming */
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io_uring_cmd_done(io->cmd, res, 0);
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io_uring_cmd_done(io->cmd, res, 0, issue_flags);
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}
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#define UBLK_REQUEUE_DELAY_MS 3
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@ -744,7 +745,8 @@ static inline void __ublk_abort_rq(struct ublk_queue *ubq,
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mod_delayed_work(system_wq, &ubq->dev->monitor_work, 0);
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}
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static inline void __ublk_rq_task_work(struct request *req)
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static inline void __ublk_rq_task_work(struct request *req,
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unsigned issue_flags)
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{
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struct ublk_queue *ubq = req->mq_hctx->driver_data;
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int tag = req->tag;
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@ -782,7 +784,7 @@ static inline void __ublk_rq_task_work(struct request *req)
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pr_devel("%s: need get data. op %d, qid %d tag %d io_flags %x\n",
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__func__, io->cmd->cmd_op, ubq->q_id,
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req->tag, io->flags);
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ubq_complete_io_cmd(io, UBLK_IO_RES_NEED_GET_DATA);
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ubq_complete_io_cmd(io, UBLK_IO_RES_NEED_GET_DATA, issue_flags);
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return;
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}
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/*
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@ -820,17 +822,18 @@ static inline void __ublk_rq_task_work(struct request *req)
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mapped_bytes >> 9;
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}
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ubq_complete_io_cmd(io, UBLK_IO_RES_OK);
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ubq_complete_io_cmd(io, UBLK_IO_RES_OK, issue_flags);
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}
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static inline void ublk_forward_io_cmds(struct ublk_queue *ubq)
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static inline void ublk_forward_io_cmds(struct ublk_queue *ubq,
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unsigned issue_flags)
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{
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struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
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struct ublk_rq_data *data, *tmp;
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io_cmds = llist_reverse_order(io_cmds);
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llist_for_each_entry_safe(data, tmp, io_cmds, node)
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__ublk_rq_task_work(blk_mq_rq_from_pdu(data));
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__ublk_rq_task_work(blk_mq_rq_from_pdu(data), issue_flags);
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}
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static inline void ublk_abort_io_cmds(struct ublk_queue *ubq)
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@ -842,12 +845,12 @@ static inline void ublk_abort_io_cmds(struct ublk_queue *ubq)
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__ublk_abort_rq(ubq, blk_mq_rq_from_pdu(data));
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}
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static void ublk_rq_task_work_cb(struct io_uring_cmd *cmd)
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static void ublk_rq_task_work_cb(struct io_uring_cmd *cmd, unsigned issue_flags)
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{
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struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
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struct ublk_queue *ubq = pdu->ubq;
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ublk_forward_io_cmds(ubq);
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ublk_forward_io_cmds(ubq, issue_flags);
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}
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static void ublk_rq_task_work_fn(struct callback_head *work)
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@ -856,8 +859,9 @@ static void ublk_rq_task_work_fn(struct callback_head *work)
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struct ublk_rq_data, work);
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struct request *req = blk_mq_rq_from_pdu(data);
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struct ublk_queue *ubq = req->mq_hctx->driver_data;
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unsigned issue_flags = IO_URING_F_UNLOCKED;
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ublk_forward_io_cmds(ubq);
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ublk_forward_io_cmds(ubq, issue_flags);
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}
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static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq)
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@ -1111,7 +1115,8 @@ static void ublk_cancel_queue(struct ublk_queue *ubq)
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struct ublk_io *io = &ubq->ios[i];
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if (io->flags & UBLK_IO_FLAG_ACTIVE)
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io_uring_cmd_done(io->cmd, UBLK_IO_RES_ABORT, 0);
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io_uring_cmd_done(io->cmd, UBLK_IO_RES_ABORT, 0,
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IO_URING_F_UNLOCKED);
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}
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/* all io commands are canceled */
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@ -1351,7 +1356,7 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
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return -EIOCBQUEUED;
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out:
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io_uring_cmd_done(cmd, ret, 0);
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io_uring_cmd_done(cmd, ret, 0, issue_flags);
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pr_devel("%s: complete: cmd op %d, tag %d ret %x io_flags %x\n",
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__func__, cmd_op, tag, ret, io->flags);
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return -EIOCBQUEUED;
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@ -2234,7 +2239,7 @@ static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd,
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if (ub)
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ublk_put_device(ub);
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out:
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io_uring_cmd_done(cmd, ret, 0);
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io_uring_cmd_done(cmd, ret, 0, issue_flags);
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pr_devel("%s: cmd done ret %d cmd_op %x, dev id %d qid %d\n",
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__func__, ret, cmd->cmd_op, header->dev_id, header->queue_id);
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return -EIOCBQUEUED;
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@ -464,7 +464,8 @@ static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
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return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
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}
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static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd)
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static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd,
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unsigned issue_flags)
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{
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struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
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struct request *req = pdu->req;
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@ -485,17 +486,18 @@ static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd)
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blk_rq_unmap_user(req->bio);
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blk_mq_free_request(req);
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io_uring_cmd_done(ioucmd, status, result);
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io_uring_cmd_done(ioucmd, status, result, issue_flags);
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}
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static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd)
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static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
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unsigned issue_flags)
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{
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struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
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if (pdu->bio)
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blk_rq_unmap_user(pdu->bio);
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io_uring_cmd_done(ioucmd, pdu->nvme_status, pdu->u.result);
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io_uring_cmd_done(ioucmd, pdu->nvme_status, pdu->u.result, issue_flags);
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}
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static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
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@ -517,7 +519,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
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* Otherwise, move the completion to task work.
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*/
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if (cookie != NULL && blk_rq_is_poll(req))
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nvme_uring_task_cb(ioucmd);
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nvme_uring_task_cb(ioucmd, IO_URING_F_UNLOCKED);
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else
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io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_cb);
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@ -539,7 +541,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io_meta(struct request *req,
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* Otherwise, move the completion to task work.
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*/
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if (cookie != NULL && blk_rq_is_poll(req))
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nvme_uring_task_meta_cb(ioucmd);
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nvme_uring_task_meta_cb(ioucmd, IO_URING_F_UNLOCKED);
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else
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io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_meta_cb);
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@ -27,7 +27,7 @@ struct io_uring_cmd {
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const void *cmd;
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union {
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/* callback to defer completions to task context */
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void (*task_work_cb)(struct io_uring_cmd *cmd);
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void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned);
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/* used for polled completion */
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void *cookie;
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};
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@ -39,9 +39,10 @@ struct io_uring_cmd {
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#if defined(CONFIG_IO_URING)
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int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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struct iov_iter *iter, void *ioucmd);
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void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2);
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void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2,
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unsigned issue_flags);
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void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *));
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void (*task_work_cb)(struct io_uring_cmd *, unsigned));
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struct sock *io_uring_get_socket(struct file *file);
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void __io_uring_cancel(bool cancel_all);
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void __io_uring_free(struct task_struct *tsk);
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@ -72,11 +73,11 @@ static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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return -EOPNOTSUPP;
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}
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static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
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ssize_t ret2)
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ssize_t ret2, unsigned issue_flags)
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{
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}
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static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *))
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void (*task_work_cb)(struct io_uring_cmd *, unsigned))
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{
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}
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static inline struct sock *io_uring_get_socket(struct file *file)
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@ -15,12 +15,13 @@
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static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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unsigned issue_flags = *locked ? 0 : IO_URING_F_UNLOCKED;
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ioucmd->task_work_cb(ioucmd);
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ioucmd->task_work_cb(ioucmd, issue_flags);
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}
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void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *))
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void (*task_work_cb)(struct io_uring_cmd *, unsigned))
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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@ -42,7 +43,8 @@ static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
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* Called by consumers of io_uring_cmd, if they originally returned
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* -EIOCBQUEUED upon receiving the command.
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*/
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void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
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void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
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unsigned issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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@ -56,7 +58,7 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
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/* order with io_iopoll_req_issued() checking ->iopoll_complete */
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smp_store_release(&req->iopoll_completed, 1);
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else
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io_req_complete_post(req, 0);
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io_req_complete_post(req, issue_flags);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_done);
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