On 3/28/23 5:41 AM, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
> The patch below does not apply to the 6.1-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
Here's a backport of this one, thanks.
--
Jens Axboe
From b24bbf6e08e0759a10fad70c824ffb2ec8346ac8 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Mon, 20 Mar 2023 20:01:25 -0600
Subject: [PATCH] block/io_uring: pass in issue_flags for uring_cmd task_work
handling
commit 9d2789ac9d60c049d26ef6d3005d9c94c5a559e9 upstream.
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@xxxxxxxxxxxxxxx
Fixes: ee692a21e9bf ("fs,io_uring: add infrastructure for uring-cmd")
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
drivers/block/ublk_drv.c | 31 ++++++++++++++++++-------------
drivers/nvme/host/ioctl.c | 14 ++++++++------
include/linux/io_uring.h | 11 ++++++-----
io_uring/uring_cmd.c | 10 ++++++----
4 files changed, 38 insertions(+), 28 deletions(-)
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 4aec9be0ab77..22a790d51284 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -656,7 +656,8 @@ 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;
@@ -668,7 +669,7 @@ 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
@@ -685,7 +686,8 @@ 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;
@@ -723,7 +725,7 @@ 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;
}
/*
@@ -761,17 +763,18 @@ 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)
@@ -783,12 +786,12 @@ 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)
@@ -797,8 +800,9 @@ 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)
@@ -1052,7 +1056,8 @@ 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 */
@@ -1295,7 +1300,7 @@ 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;
@@ -2053,7 +2058,7 @@ static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd,
break;
}
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 81f5550b670d..8224675f8de2 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -387,7 +387,8 @@ 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;
@@ -408,17 +409,18 @@ 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,
@@ -440,7 +442,7 @@ 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);
@@ -462,7 +464,7 @@ 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 0ded9e271523..a1484cdb3158 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -26,7 +26,7 @@ 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;
};
@@ -38,9 +38,10 @@ 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);
@@ -71,11 +72,11 @@ 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 18dfc5f6a8b7..92f310dfb9fd 100644
--- 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(req, 0);
+ __io_req_complete(req, issue_flags);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);
--
2.39.2
