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io_uring: remove ctx referencing from complete_post 

Now completions are done from task context, that means that it's either
the task itself, task_work or io-wq worker. In all those cases the ctx
will be staying alive by mutexing, explicit referencing or req references
by iowq. Remove extra ctx pinning from io_req_complete_post().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/60a0e96434c16ab4fe587651448290d61ec9a113.1631703756.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-09-15 12:04:20 +01:00 committed by Jens Axboe
parent 83f84356bc
commit a3f349071e
1 changed files with 2 additions and 8 deletions
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10
fs/io_uring.c
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@ -1809,17 +1809,11 @@ static void io_req_complete_post(struct io_kiocb *req, long res,
io_put_task(req->task, 1);
list_add(&req->inflight_entry, &ctx->locked_free_list);
ctx->locked_free_nr++;
} else {
if (!percpu_ref_tryget(&ctx->refs))
req = NULL;
percpu_ref_put(&ctx->refs);
}
io_commit_cqring(ctx);
spin_unlock(&ctx->completion_lock);
if (req) {
io_cqring_ev_posted(ctx);
percpu_ref_put(&ctx->refs);
}
io_cqring_ev_posted(ctx);
}
static inline bool io_req_needs_clean(struct io_kiocb *req)