[PATCH 5.13 30/35] io_uring: never attempt iopoll reissue from release path

Greg Kroah-Hartman
2021-08-06T08:25:51Z

From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 3c30ef0f78cfb36fdb13753794b0384cf7e37cc9 ]

There are two reasons why this shouldn't be done:

1) Ring is exiting, and we're canceling requests anyway. Any request
should be canceled anyway. In theory, this could iterate for a
number of times if someone else is also driving the target block
queue into request starvation, however the likelihood of this
happening is miniscule.

2) If the original task decided to pass the ring to another task, then
we don't want to be reissuing from this context as it may be an
unrelated task or context. No assumptions should be made about
the context in which ->release() is run. This can only happen for pure
read/write, and we'll get -EFAULT on them anyway.

Link: https://lore.kernel.org/io-uring/YPr4OaHv0iv0KTOc@zeniv-ca.linux.org.uk/
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/io_uring.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index d465e9997157..86f609fa761c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2252,7 +2252,7 @@ static inline bool io_run_task_work(void)
* Find and free completed poll iocbs
*/
static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
- struct list_head *done)
+ struct list_head *done, bool resubmit)
{
struct req_batch rb;
struct io_kiocb *req;
@@ -2267,7 +2267,7 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
req = list_first_entry(done, struct io_kiocb, inflight_entry);
list_del(&req->inflight_entry);

- if (READ_ONCE(req->result) == -EAGAIN &&
+ if (READ_ONCE(req->result) == -EAGAIN && resubmit &&
!(req->flags & REQ_F_DONT_REISSUE)) {
req->iopoll_completed = 0;
req_ref_get(req);
@@ -2291,7 +2291,7 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
}

static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
- long min)
+ long min, bool resubmit)
{
struct io_kiocb *req, *tmp;
LIST_HEAD(done);
@@ -2334,7 +2334,7 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
}

if (!list_empty(&done))
- io_iopoll_complete(ctx, nr_events, &done);
+ io_iopoll_complete(ctx, nr_events, &done, resubmit);

return ret;
}
@@ -2352,7 +2352,7 @@ static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx)
while (!list_empty(&ctx->iopoll_list)) {
unsigned int nr_events = 0;

- io_do_iopoll(ctx, &nr_events, 0);
+ io_do_iopoll(ctx, &nr_events, 0, false);

/* let it sleep and repeat later if can't complete a request */
if (nr_events == 0)
@@ -2410,7 +2410,7 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
if (list_empty(&ctx->iopoll_list))
break;
}
- ret = io_do_iopoll(ctx, &nr_events, min);
+ ret = io_do_iopoll(ctx, &nr_events, min, true);
} while (!ret && nr_events < min && !need_resched());
out:
mutex_unlock(&ctx->uring_lock);
@@ -6804,7 +6804,7 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)

mutex_lock(&ctx->uring_lock);
if (!list_empty(&ctx->iopoll_list))
- io_do_iopoll(ctx, &nr_events, 0);
+ io_do_iopoll(ctx, &nr_events, 0, true);

/*
* Don't submit if refs are dying, good for io_uring_register(),
--
2.30.2