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: ee692a21e9bf ("fs,io_uring: add infrastructure for uring-cmd")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index fb5a557..c73cc57 100644 (file)
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -715,7 +715,8 @@ static void __ublk_fail_req(struct ublk_queue *ubq, struct ublk_io *io,
        }
 }
 
-static void ubq_complete_io_cmd(struct ublk_io *io, int res)
+static void ubq_complete_io_cmd(struct ublk_io *io, int res,
+                               unsigned issue_flags)
 {
        /* mark this cmd owned by ublksrv */
        io->flags |= UBLK_IO_FLAG_OWNED_BY_SRV;
@@ -727,7 +728,7 @@ static void ubq_complete_io_cmd(struct ublk_io *io, int res)
        io->flags &= ~UBLK_IO_FLAG_ACTIVE;
 
        /* tell ublksrv one io request is coming */
-       io_uring_cmd_done(io->cmd, res, 0);
+       io_uring_cmd_done(io->cmd, res, 0, issue_flags);
 }
 
 #define UBLK_REQUEUE_DELAY_MS  3
@@ -744,7 +745,8 @@ static inline void __ublk_abort_rq(struct ublk_queue *ubq,
        mod_delayed_work(system_wq, &ubq->dev->monitor_work, 0);
 }
 
-static inline void __ublk_rq_task_work(struct request *req)
+static inline void __ublk_rq_task_work(struct request *req,
+                                      unsigned issue_flags)
 {
        struct ublk_queue *ubq = req->mq_hctx->driver_data;
        int tag = req->tag;
@@ -782,7 +784,7 @@ static inline void __ublk_rq_task_work(struct request *req)
                        pr_devel("%s: need get data. op %d, qid %d tag %d io_flags %x\n",
                                        __func__, io->cmd->cmd_op, ubq->q_id,
                                        req->tag, io->flags);
-                       ubq_complete_io_cmd(io, UBLK_IO_RES_NEED_GET_DATA);
+                       ubq_complete_io_cmd(io, UBLK_IO_RES_NEED_GET_DATA, issue_flags);
                        return;
                }
                /*
@@ -820,17 +822,18 @@ static inline void __ublk_rq_task_work(struct request *req)
                        mapped_bytes >> 9;
        }
 
-       ubq_complete_io_cmd(io, UBLK_IO_RES_OK);
+       ubq_complete_io_cmd(io, UBLK_IO_RES_OK, issue_flags);
 }
 
-static inline void ublk_forward_io_cmds(struct ublk_queue *ubq)
+static inline void ublk_forward_io_cmds(struct ublk_queue *ubq,
+                                       unsigned issue_flags)
 {
        struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
        struct ublk_rq_data *data, *tmp;
 
        io_cmds = llist_reverse_order(io_cmds);
        llist_for_each_entry_safe(data, tmp, io_cmds, node)
-               __ublk_rq_task_work(blk_mq_rq_from_pdu(data));
+               __ublk_rq_task_work(blk_mq_rq_from_pdu(data), issue_flags);
 }
 
 static inline void ublk_abort_io_cmds(struct ublk_queue *ubq)
@@ -842,12 +845,12 @@ static inline void ublk_abort_io_cmds(struct ublk_queue *ubq)
                __ublk_abort_rq(ubq, blk_mq_rq_from_pdu(data));
 }
 
-static void ublk_rq_task_work_cb(struct io_uring_cmd *cmd)
+static void ublk_rq_task_work_cb(struct io_uring_cmd *cmd, unsigned issue_flags)
 {
        struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
        struct ublk_queue *ubq = pdu->ubq;
 
-       ublk_forward_io_cmds(ubq);
+       ublk_forward_io_cmds(ubq, issue_flags);
 }
 
 static void ublk_rq_task_work_fn(struct callback_head *work)
@@ -856,8 +859,9 @@ static void ublk_rq_task_work_fn(struct callback_head *work)
                        struct ublk_rq_data, work);
        struct request *req = blk_mq_rq_from_pdu(data);
        struct ublk_queue *ubq = req->mq_hctx->driver_data;
+       unsigned issue_flags = IO_URING_F_UNLOCKED;
 
-       ublk_forward_io_cmds(ubq);
+       ublk_forward_io_cmds(ubq, issue_flags);
 }
 
 static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq)
@@ -1111,7 +1115,8 @@ static void ublk_cancel_queue(struct ublk_queue *ubq)
                struct ublk_io *io = &ubq->ios[i];
 
                if (io->flags & UBLK_IO_FLAG_ACTIVE)
-                       io_uring_cmd_done(io->cmd, UBLK_IO_RES_ABORT, 0);
+                       io_uring_cmd_done(io->cmd, UBLK_IO_RES_ABORT, 0,
+                                               IO_URING_F_UNLOCKED);
        }
 
        /* all io commands are canceled */
@@ -1351,7 +1356,7 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
        return -EIOCBQUEUED;
 
  out:
-       io_uring_cmd_done(cmd, ret, 0);
+       io_uring_cmd_done(cmd, ret, 0, issue_flags);
        pr_devel("%s: complete: cmd op %d, tag %d ret %x io_flags %x\n",
                        __func__, cmd_op, tag, ret, io->flags);
        return -EIOCBQUEUED;
@@ -2234,7 +2239,7 @@ static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd,
        if (ub)
                ublk_put_device(ub);
  out:
-       io_uring_cmd_done(cmd, ret, 0);
+       io_uring_cmd_done(cmd, ret, 0, issue_flags);
        pr_devel("%s: cmd done ret %d cmd_op %x, dev id %d qid %d\n",
                        __func__, ret, cmd->cmd_op, header->dev_id, header->queue_id);
        return -EIOCBQUEUED;

diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 723e7d5..d24ea2e 100644 (file)
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -464,7 +464,8 @@ static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
        return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
 }
 
-static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd)
+static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd,
+                                   unsigned issue_flags)
 {
        struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
        struct request *req = pdu->req;
@@ -485,17 +486,18 @@ static void nvme_uring_task_meta_cb(struct io_uring_cmd *ioucmd)
                blk_rq_unmap_user(req->bio);
        blk_mq_free_request(req);
 
-       io_uring_cmd_done(ioucmd, status, result);
+       io_uring_cmd_done(ioucmd, status, result, issue_flags);
 }
 
-static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd)
+static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd,
+                              unsigned issue_flags)
 {
        struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
 
        if (pdu->bio)
                blk_rq_unmap_user(pdu->bio);
 
-       io_uring_cmd_done(ioucmd, pdu->nvme_status, pdu->u.result);
+       io_uring_cmd_done(ioucmd, pdu->nvme_status, pdu->u.result, issue_flags);
 }
 
 static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
@@ -517,7 +519,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
         * Otherwise, move the completion to task work.
         */
        if (cookie != NULL && blk_rq_is_poll(req))
-               nvme_uring_task_cb(ioucmd);
+               nvme_uring_task_cb(ioucmd, IO_URING_F_UNLOCKED);
        else
                io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_cb);
 
@@ -539,7 +541,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io_meta(struct request *req,
         * Otherwise, move the completion to task work.
         */
        if (cookie != NULL && blk_rq_is_poll(req))
-               nvme_uring_task_meta_cb(ioucmd);
+               nvme_uring_task_meta_cb(ioucmd, IO_URING_F_UNLOCKED);
        else
                io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_meta_cb);
 

diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 934e5dd..35b9328 100644 (file)
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -27,7 +27,7 @@ struct io_uring_cmd {
        const void      *cmd;
        union {
                /* callback to defer completions to task context */
-               void (*task_work_cb)(struct io_uring_cmd *cmd);
+               void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned);
                /* used for polled completion */
                void *cookie;
        };
@@ -39,9 +39,10 @@ struct io_uring_cmd {
 #if defined(CONFIG_IO_URING)
 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
                              struct iov_iter *iter, void *ioucmd);
-void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2);
+void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2,
+                       unsigned issue_flags);
 void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
-                       void (*task_work_cb)(struct io_uring_cmd *));
+                       void (*task_work_cb)(struct io_uring_cmd *, unsigned));
 struct sock *io_uring_get_socket(struct file *file);
 void __io_uring_cancel(bool cancel_all);
 void __io_uring_free(struct task_struct *tsk);
@@ -72,11 +73,11 @@ static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
        return -EOPNOTSUPP;
 }
 static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
-               ssize_t ret2)
+               ssize_t ret2, unsigned issue_flags)
 {
 }
 static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
-                       void (*task_work_cb)(struct io_uring_cmd *))
+                       void (*task_work_cb)(struct io_uring_cmd *, unsigned))
 {
 }
 static inline struct sock *io_uring_get_socket(struct file *file)

diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index 446a189..e535e8d 100644 (file)
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -15,12 +15,13 @@
 static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
 {
        struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
+       unsigned issue_flags = *locked ? 0 : IO_URING_F_UNLOCKED;
 
-       ioucmd->task_work_cb(ioucmd);
+       ioucmd->task_work_cb(ioucmd, issue_flags);
 }
 
 void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
-                       void (*task_work_cb)(struct io_uring_cmd *))
+                       void (*task_work_cb)(struct io_uring_cmd *, unsigned))
 {
        struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
 
@@ -42,7 +43,8 @@ static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
  * Called by consumers of io_uring_cmd, if they originally returned
  * -EIOCBQUEUED upon receiving the command.
  */
-void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
+void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
+                      unsigned issue_flags)
 {
        struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
 
@@ -56,7 +58,7 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
                /* order with io_iopoll_req_issued() checking ->iopoll_complete */
                smp_store_release(&req->iopoll_completed, 1);
        else
-               io_req_complete_post(req, 0);
+               io_req_complete_post(req, issue_flags);
 }
 EXPORT_SYMBOL_GPL(io_uring_cmd_done);