* [PATCH AUTOSEL 5.10 32/51] io_uring: drop file refs after task cancel
[not found] <[email protected]>
@ 2021-01-12 12:55 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-01-12 12:55 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Pavel Begunkov, Jens Axboe, Sasha Levin, io-uring, linux-fsdevel
From: Pavel Begunkov <[email protected]>
[ Upstream commit de7f1d9e99d8b99e4e494ad8fcd91f0c4c5c9357 ]
io_uring fds marked O_CLOEXEC and we explicitly cancel all requests
before going through exec, so we don't want to leave task's file
references to not our anymore io_uring instances.
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 | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 1f798c5c4213e..aebdbc842a637 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8807,6 +8807,15 @@ static void io_uring_attempt_task_drop(struct file *file)
io_uring_del_task_file(file);
}
+static void io_uring_remove_task_files(struct io_uring_task *tctx)
+{
+ struct file *file;
+ unsigned long index;
+
+ xa_for_each(&tctx->xa, index, file)
+ io_uring_del_task_file(file);
+}
+
void __io_uring_files_cancel(struct files_struct *files)
{
struct io_uring_task *tctx = current->io_uring;
@@ -8815,16 +8824,12 @@ void __io_uring_files_cancel(struct files_struct *files)
/* make sure overflow events are dropped */
atomic_inc(&tctx->in_idle);
-
- xa_for_each(&tctx->xa, index, file) {
- struct io_ring_ctx *ctx = file->private_data;
-
- io_uring_cancel_task_requests(ctx, files);
- if (files)
- io_uring_del_task_file(file);
- }
-
+ xa_for_each(&tctx->xa, index, file)
+ io_uring_cancel_task_requests(file->private_data, files);
atomic_dec(&tctx->in_idle);
+
+ if (files)
+ io_uring_remove_task_files(tctx);
}
static s64 tctx_inflight(struct io_uring_task *tctx)
@@ -8887,6 +8892,8 @@ void __io_uring_task_cancel(void)
finish_wait(&tctx->wait, &wait);
atomic_dec(&tctx->in_idle);
+
+ io_uring_remove_task_files(tctx);
}
static int io_uring_flush(struct file *file, void *data)
--
2.27.0
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