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io_uring: drop file refs after task cancel 

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 <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-01-04 20:43:29 +00:00 committed by Jens Axboe
parent 6c503150ae
commit de7f1d9e99
1 changed files with 16 additions and 9 deletions
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25
fs/io_uring.c
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@ -8958,6 +8958,15 @@ 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;
@ -8966,16 +8975,12 @@ 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)
@ -9038,6 +9043,8 @@ void __io_uring_task_cancel(void)
} while (1);
atomic_dec(&tctx->in_idle);
io_uring_remove_task_files(tctx);
}
static int io_uring_flush(struct file *file, void *data)