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block/io_uring: pass in issue_flags for uring_cmd task_work handling
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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: ee692a2 ("fs,io_uring: add infrastructure for uring-cmd")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Jens Axboe committed Mar 21, 2023
1 parent 4985e7b commit 9d2789a
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Showing 4 changed files with 38 additions and 28 deletions.
31 changes: 18 additions & 13 deletions drivers/block/ublk_drv.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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
Expand All @@ -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;
Expand Down Expand Up @@ -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;
}
/*
Expand Down Expand Up @@ -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)
Expand All @@ -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)
Expand All @@ -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)
Expand Down Expand Up @@ -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 */
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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;
Expand Down
14 changes: 8 additions & 6 deletions drivers/nvme/host/ioctl.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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,
Expand All @@ -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);

Expand All @@ -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);

Expand Down
11 changes: 6 additions & 5 deletions include/linux/io_uring.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
};
Expand All @@ -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);
Expand Down Expand Up @@ -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)
Expand Down
10 changes: 6 additions & 4 deletions io_uring/uring_cmd.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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);

Expand All @@ -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);

Expand All @@ -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);

Expand Down

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