* [PATCH AUTOSEL 5.11 58/61] io_uring: cancel deferred requests in try_cancel
[not found] <[email protected]>
@ 2021-03-17 0:55 ` Sasha Levin
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From: Sasha Levin @ 2021-03-17 0:55 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Pavel Begunkov, Jens Axboe, Sasha Levin, io-uring
From: Pavel Begunkov <[email protected]>
[ Upstream commit e1915f76a8981f0a750cf56515df42582a37c4b0 ]
As io_uring_cancel_files() and others let SQO to run between
io_uring_try_cancel_requests(), SQO may generate new deferred requests,
so it's safer to try to cancel them in it.
Signed-off-by: Pavel Begunkov <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
fs/io_uring.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 241313278e5a..89708ffc1c2b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8848,11 +8848,11 @@ static bool io_cancel_task_cb(struct io_wq_work *work, void *data)
return ret;
}
-static void io_cancel_defer_files(struct io_ring_ctx *ctx,
+static bool io_cancel_defer_files(struct io_ring_ctx *ctx,
struct task_struct *task,
struct files_struct *files)
{
- struct io_defer_entry *de = NULL;
+ struct io_defer_entry *de;
LIST_HEAD(list);
spin_lock_irq(&ctx->completion_lock);
@@ -8863,6 +8863,8 @@ static void io_cancel_defer_files(struct io_ring_ctx *ctx,
}
}
spin_unlock_irq(&ctx->completion_lock);
+ if (list_empty(&list))
+ return false;
while (!list_empty(&list)) {
de = list_first_entry(&list, struct io_defer_entry, list);
@@ -8872,6 +8874,7 @@ static void io_cancel_defer_files(struct io_ring_ctx *ctx,
io_req_complete(de->req, -ECANCELED);
kfree(de);
}
+ return true;
}
static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
@@ -8898,6 +8901,7 @@ static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
}
}
+ ret |= io_cancel_defer_files(ctx, task, files);
ret |= io_poll_remove_all(ctx, task, files);
ret |= io_kill_timeouts(ctx, task, files);
ret |= io_run_task_work();
@@ -8976,8 +8980,6 @@ static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
io_sq_thread_park(ctx->sq_data);
}
- io_cancel_defer_files(ctx, task, files);
-
io_uring_cancel_files(ctx, task, files);
if (!files)
io_uring_try_cancel_requests(ctx, task, NULL);
--
2.30.1
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