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io_uring: remove req cancel in ->flush()

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Every close(io_uring) causes cancellation of all inflight requests
carrying ->files. That's not nice but was neccessary up until recently.
Now task->files removal is handled in the core code, so that part of
flush can be removed.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-10-22 16:38:27 +01:00 committed by Jens Axboe
parent 43c01fbefd
commit c8fb20b5b4
1 changed files with 5 additions and 23 deletions
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28
fs/io_uring.c
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@ -8684,19 +8684,11 @@ static void io_uring_del_task_file(struct file *file)
fput(file);
}
static void __io_uring_attempt_task_drop(struct file *file)
{
struct file *old = xa_load(&current->io_uring->xa, (unsigned long)file);
if (old == file)
io_uring_del_task_file(file);
}
/*
* Drop task note for this file if we're the only ones that hold it after
* pending fput()
*/
static void io_uring_attempt_task_drop(struct file *file, bool exiting)
static void io_uring_attempt_task_drop(struct file *file)
{
if (!current->io_uring)
return;
@ -8704,10 +8696,9 @@ static void io_uring_attempt_task_drop(struct file *file, bool exiting)
* fput() is pending, will be 2 if the only other ref is our potential
* task file note. If the task is exiting, drop regardless of count.
*/
if (!exiting && atomic_long_read(&file->f_count) != 2)
return;
__io_uring_attempt_task_drop(file);
if (fatal_signal_pending(current) || (current->flags & PF_EXITING) ||
atomic_long_read(&file->f_count) == 2)
io_uring_del_task_file(file);
}
void __io_uring_files_cancel(struct files_struct *files)
@ -8765,16 +8756,7 @@ void __io_uring_task_cancel(void)
static int io_uring_flush(struct file *file, void *data)
{
struct io_ring_ctx *ctx = file->private_data;
/*
* If the task is going away, cancel work it may have pending
*/
if (fatal_signal_pending(current) || (current->flags & PF_EXITING))
data = NULL;
io_uring_cancel_task_requests(ctx, data);
io_uring_attempt_task_drop(file, !data);
io_uring_attempt_task_drop(file);
return 0;
}