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io_uring: unify files and task cancel 

Now __io_uring_cancel() and __io_uring_files_cancel() are very similar
and mostly differ by how we count requests, merge them and allow
tctx_inflight() to handle counting.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1a5986a97df4dc1378f3fe0ca1eb483dbcf42112.1618101759.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-04-11 01:46:27 +01:00 committed by Jens Axboe
parent b303fe2e5a
commit 3f48cf18f8
2 changed files with 20 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
fs/io_uring.c
View File

@ -8920,13 +8920,10 @@ static void io_uring_clean_tctx(struct io_uring_task *tctx)
}
}
static s64 tctx_inflight_tracked(struct io_uring_task *tctx)
{
return atomic_read(&tctx->inflight_tracked);
}
static s64 tctx_inflight(struct io_uring_task *tctx)
static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked)
{
if (tracked)
return atomic_read(&tctx->inflight_tracked);
return percpu_counter_sum(&tctx->inflight);
}
@ -8993,7 +8990,7 @@ static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx)
atomic_inc(&tctx->in_idle);
do {
/* read completions before cancelations */
inflight = tctx_inflight(tctx);
inflight = tctx_inflight(tctx, false);
if (!inflight)
break;
io_uring_try_cancel_requests(ctx, current, NULL);
@ -9004,43 +9001,18 @@ static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx)
* avoids a race where a completion comes in before we did
* prepare_to_wait().
*/
if (inflight == tctx_inflight(tctx))
if (inflight == tctx_inflight(tctx, false))
schedule();
finish_wait(&tctx->wait, &wait);
} while (1);
atomic_dec(&tctx->in_idle);
}
void __io_uring_files_cancel(struct files_struct *files)
{
struct io_uring_task *tctx = current->io_uring;
DEFINE_WAIT(wait);
s64 inflight;
/* make sure overflow events are dropped */
atomic_inc(&tctx->in_idle);
do {
/* read completions before cancelations */
inflight = tctx_inflight_tracked(tctx);
if (!inflight)
break;
io_uring_try_cancel(files);
prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE);
if (inflight == tctx_inflight_tracked(tctx))
schedule();
finish_wait(&tctx->wait, &wait);
} while (1);
atomic_dec(&tctx->in_idle);
io_uring_clean_tctx(tctx);
}
/*
* Find any io_uring fd that this task has registered or done IO on, and cancel
* requests.
*/
void __io_uring_task_cancel(void)
void __io_uring_cancel(struct files_struct *files)
{
struct io_uring_task *tctx = current->io_uring;
DEFINE_WAIT(wait);
@ -9048,15 +9020,14 @@ void __io_uring_task_cancel(void)
/* make sure overflow events are dropped */
atomic_inc(&tctx->in_idle);
__io_uring_files_cancel(NULL);
io_uring_try_cancel(files);
do {
/* read completions before cancelations */
inflight = tctx_inflight(tctx);
inflight = tctx_inflight(tctx, !!files);
if (!inflight)
break;
io_uring_try_cancel(NULL);
io_uring_try_cancel(files);
prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE);
/*
@ -9064,16 +9035,17 @@ void __io_uring_task_cancel(void)
* avoids a race where a completion comes in before we did
* prepare_to_wait().
*/
if (inflight == tctx_inflight(tctx))
if (inflight == tctx_inflight(tctx, !!files))
schedule();
finish_wait(&tctx->wait, &wait);
} while (1);
atomic_dec(&tctx->in_idle);
io_uring_clean_tctx(tctx);
/* all current's requests should be gone, we can kill tctx */
__io_uring_free(current);
if (!files) {
/* for exec all current's requests should be gone, kill tctx */
__io_uring_free(current);
}
}
static void *io_uring_validate_mmap_request(struct file *file,

14
include/linux/io_uring.h
View File

@ -7,19 +7,17 @@
#if defined(CONFIG_IO_URING)
struct sock *io_uring_get_socket(struct file *file);
void __io_uring_task_cancel(void);
void __io_uring_files_cancel(struct files_struct *files);
void __io_uring_cancel(struct files_struct *files);
void __io_uring_free(struct task_struct *tsk);
static inline void io_uring_task_cancel(void)
{
if (current->io_uring)
__io_uring_task_cancel();
}
static inline void io_uring_files_cancel(struct files_struct *files)
{
if (current->io_uring)
__io_uring_files_cancel(files);
__io_uring_cancel(files);
}
static inline void io_uring_task_cancel(void)
{
return io_uring_files_cancel(NULL);
}
static inline void io_uring_free(struct task_struct *tsk)
{