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authorPavel Begunkov <asml.silence@gmail.com>2021-03-11 23:29:35 +0000
committerJens Axboe <axboe@kernel.dk>2021-03-12 07:23:00 -0700
commite1915f76a8981f0a750cf56515df42582a37c4b0 (patch)
treeca912172c529fb7e9e91072f520602ca22f1bcf5 /fs/io_uring.c
parentd052d1d685f5125249ab4ff887562c88ba959638 (diff)
downloadlinux-stericsson-e1915f76a8981f0a750cf56515df42582a37c4b0.tar.gz
io_uring: cancel deferred requests in try_cancel
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 <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
-rw-r--r--fs/io_uring.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 49f85f49e1c3..56f3d8f408c9 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8577,11 +8577,11 @@ 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);
@@ -8592,6 +8592,8 @@ 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);
@@ -8601,6 +8603,7 @@ static void io_cancel_defer_files(struct io_ring_ctx *ctx,
io_req_complete(de->req, -ECANCELED);
kfree(de);
}
+ return true;
}
static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data)
@@ -8666,6 +8669,7 @@ 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();
@@ -8734,8 +8738,6 @@ static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
atomic_inc(&task->io_uring->in_idle);
}
- io_cancel_defer_files(ctx, task, files);
-
io_uring_cancel_files(ctx, task, files);
if (!files)
io_uring_try_cancel_requests(ctx, task, NULL);