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io_uring: enable task/files specific overflow flushing 

This allows us to selectively flush out pending overflows, depending on
the task and/or files_struct being passed in.

No intended functional changes in this patch.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-28 13:10:13 -06:00
parent 76e1b6427f
commit e6c8aa9ac3
1 changed files with 25 additions and 16 deletions
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41
fs/io_uring.c
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@ -1344,12 +1344,24 @@ static void io_cqring_mark_overflow(struct io_ring_ctx *ctx)
}
}
static inline bool io_match_files(struct io_kiocb *req,
struct files_struct *files)
{
if (!files)
return true;
if (req->flags & REQ_F_WORK_INITIALIZED)
return req->work.files == files;
return false;
}
/* Returns true if there are no backlogged entries after the flush */
static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
struct task_struct *tsk,
struct files_struct *files)
{
struct io_rings *rings = ctx->rings;
struct io_kiocb *req, *tmp;
struct io_uring_cqe *cqe;
struct io_kiocb *req;
unsigned long flags;
LIST_HEAD(list);
@ -1368,13 +1380,16 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
ctx->cq_overflow_flushed = 1;
cqe = NULL;
while (!list_empty(&ctx->cq_overflow_list)) {
list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) {
if (tsk && req->task != tsk)
continue;
if (!io_match_files(req, files))
continue;
cqe = io_get_cqring(ctx);
if (!cqe && !force)
break;
req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb,
compl.list);
list_move(&req->compl.list, &list);
if (cqe) {
WRITE_ONCE(cqe->user_data, req->user_data);
@ -1988,7 +2003,7 @@ static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush)
if (noflush && !list_empty(&ctx->cq_overflow_list))
return -1U;
io_cqring_overflow_flush(ctx, false);
io_cqring_overflow_flush(ctx, false, NULL, NULL);
}
/* See comment at the top of this file */
@ -6489,7 +6504,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
/* if we have a backlog and couldn't flush it all, return BUSY */
if (test_bit(0, &ctx->sq_check_overflow)) {
if (!list_empty(&ctx->cq_overflow_list) &&
!io_cqring_overflow_flush(ctx, false))
!io_cqring_overflow_flush(ctx, false, NULL, NULL))
return -EBUSY;
}
@ -7993,7 +8008,7 @@ static void io_ring_exit_work(struct work_struct *work)
*/
do {
if (ctx->rings)
io_cqring_overflow_flush(ctx, true);
io_cqring_overflow_flush(ctx, true, NULL, NULL);
io_iopoll_try_reap_events(ctx);
} while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20));
io_ring_ctx_free(ctx);
@ -8013,7 +8028,7 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
/* if we failed setting up the ctx, we might not have any rings */
if (ctx->rings)
io_cqring_overflow_flush(ctx, true);
io_cqring_overflow_flush(ctx, true, NULL, NULL);
io_iopoll_try_reap_events(ctx);
idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx);
@ -8069,12 +8084,6 @@ static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req)
return false;
}
static inline bool io_match_files(struct io_kiocb *req,
struct files_struct *files)
{
return (req->flags & REQ_F_WORK_INITIALIZED) && req->work.files == files;
}
static bool io_match_link_files(struct io_kiocb *req,
struct files_struct *files)
{
@ -8365,7 +8374,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
ret = 0;
if (ctx->flags & IORING_SETUP_SQPOLL) {
if (!list_empty_careful(&ctx->cq_overflow_list))
io_cqring_overflow_flush(ctx, false);
io_cqring_overflow_flush(ctx, false, NULL, NULL);
if (flags & IORING_ENTER_SQ_WAKEUP)
wake_up(&ctx->sqo_wait);
submitted = to_submit;