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io_uring: cancel all task's requests on exit 

If a process is going away, io_uring_flush() will cancel only 1
request with a matching pid. Cancel all of them

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-15 10:24:04 +03:00 committed by Jens Axboe
parent 4f26bda152
commit 44e728b8aa
3 changed files with 12 additions and 17 deletions
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14
fs/io-wq.c
View File

@ -1018,20 +1018,6 @@ enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork)
return io_wq_cancel_cb(wq, io_wq_io_cb_cancel_data, (void *)cwork, false);
}
static bool io_wq_pid_match(struct io_wq_work *work, void *data)
{
pid_t pid = (pid_t) (unsigned long) data;
return work->task_pid == pid;
}
enum io_wq_cancel io_wq_cancel_pid(struct io_wq *wq, pid_t pid)
{
void *data = (void *) (unsigned long) pid;
return io_wq_cancel_cb(wq, io_wq_pid_match, data, false);
}
struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
{
int ret = -ENOMEM, node;

1
fs/io-wq.h
View File

@ -125,7 +125,6 @@ static inline bool io_wq_is_hashed(struct io_wq_work *work)
void io_wq_cancel_all(struct io_wq *wq);
enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);
enum io_wq_cancel io_wq_cancel_pid(struct io_wq *wq, pid_t pid);
typedef bool (work_cancel_fn)(struct io_wq_work *, void *);

14
fs/io_uring.c
View File

@ -7424,6 +7424,13 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
}
}
static bool io_cancel_pid_cb(struct io_wq_work *work, void *data)
{
pid_t pid = (pid_t) (unsigned long) data;
return work->task_pid == pid;
}
static int io_uring_flush(struct file *file, void *data)
{
struct io_ring_ctx *ctx = file->private_data;
@ -7433,8 +7440,11 @@ static int io_uring_flush(struct file *file, void *data)
/*
* If the task is going away, cancel work it may have pending
*/
if (fatal_signal_pending(current) || (current->flags & PF_EXITING))
io_wq_cancel_pid(ctx->io_wq, task_pid_vnr(current));
if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) {
void *data = (void *) (unsigned long)task_pid_vnr(current);
io_wq_cancel_cb(ctx->io_wq, io_cancel_pid_cb, data, true);
}
return 0;
}