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io_uring: make submission ref putting consistent 

The rule is simple, any async handler gets a submission ref and should
put it at the end. Make them all follow it, and so more consistent.

This is a preparation patch, and as io_wq_assign_next() currently won't
ever work, this doesn't care to use io_put_req_find_next() instead of
io_put_req().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>

refcount_inc_not_zero() -> refcount_inc() fix.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-03-03 21:33:11 +03:00 committed by Jens Axboe
parent a2100672f3
commit 594506fec5
1 changed files with 13 additions and 14 deletions
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27
fs/io_uring.c
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@ -2550,7 +2550,7 @@ static bool io_req_cancelled(struct io_kiocb *req)
if (req->work.flags & IO_WQ_WORK_CANCEL) {
req_set_fail_links(req);
io_cqring_add_event(req, -ECANCELED);
io_put_req(req);
io_double_put_req(req);
return true;
}
@ -2600,6 +2600,7 @@ static void io_fsync_finish(struct io_wq_work **workptr)
if (io_req_cancelled(req))
return;
__io_fsync(req, &nxt);
io_put_req(req); /* drop submission reference */
if (nxt)
io_wq_assign_next(workptr, nxt);
}
@ -2609,7 +2610,6 @@ static int io_fsync(struct io_kiocb *req, struct io_kiocb **nxt,
{
/* fsync always requires a blocking context */
if (force_nonblock) {
io_put_req(req);
req->work.func = io_fsync_finish;
return -EAGAIN;
}
@ -2621,9 +2621,6 @@ static void __io_fallocate(struct io_kiocb *req, struct io_kiocb **nxt)
{
int ret;
if (io_req_cancelled(req))
return;
ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off,
req->sync.len);
if (ret < 0)
@ -2637,7 +2634,10 @@ static void io_fallocate_finish(struct io_wq_work **workptr)
struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
struct io_kiocb *nxt = NULL;
if (io_req_cancelled(req))
return;
__io_fallocate(req, &nxt);
io_put_req(req); /* drop submission reference */
if (nxt)
io_wq_assign_next(workptr, nxt);
}
@ -2659,7 +2659,6 @@ static int io_fallocate(struct io_kiocb *req, struct io_kiocb **nxt,
{
/* fallocate always requiring blocking context */
if (force_nonblock) {
io_put_req(req);
req->work.func = io_fallocate_finish;
return -EAGAIN;
}
@ -3015,6 +3014,7 @@ static void io_close_finish(struct io_wq_work **workptr)
/* not cancellable, don't do io_req_cancelled() */
__io_close_finish(req, &nxt);
io_put_req(req); /* drop submission reference */
if (nxt)
io_wq_assign_next(workptr, nxt);
}
@ -3031,6 +3031,9 @@ static int io_close(struct io_kiocb *req, struct io_kiocb **nxt,
/* if the file has a flush method, be safe and punt to async */
if (req->close.put_file->f_op->flush && force_nonblock) {
/* submission ref will be dropped, take it for async */
refcount_inc(&req->refs);
req->work.func = io_close_finish;
/*
* Do manual async queue here to avoid grabbing files - we don't
@ -3088,6 +3091,7 @@ static void io_sync_file_range_finish(struct io_wq_work **workptr)
if (io_req_cancelled(req))
return;
__io_sync_file_range(req, &nxt);
io_put_req(req); /* put submission ref */
if (nxt)
io_wq_assign_next(workptr, nxt);
}
@ -3097,7 +3101,6 @@ static int io_sync_file_range(struct io_kiocb *req, struct io_kiocb **nxt,
{
/* sync_file_range always requires a blocking context */
if (force_nonblock) {
io_put_req(req);
req->work.func = io_sync_file_range_finish;
return -EAGAIN;
}
@ -3464,11 +3467,10 @@ static void io_accept_finish(struct io_wq_work **workptr)
struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
struct io_kiocb *nxt = NULL;
io_put_req(req);
if (io_req_cancelled(req))
return;
__io_accept(req, &nxt, false);
io_put_req(req); /* drop submission reference */
if (nxt)
io_wq_assign_next(workptr, nxt);
}
@ -4734,17 +4736,14 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
} while (1);
}
/* drop submission reference */
io_put_req(req);
if (ret) {
req_set_fail_links(req);
io_cqring_add_event(req, ret);
io_put_req(req);
}
/* if a dependent link is ready, pass it back */
if (!ret && nxt)
io_put_req(req); /* drop submission reference */
if (nxt)
io_wq_assign_next(workptr, nxt);
}