[PATCH 02/11] block: simplify struct io_context refcounting
From: Christoph Hellwig <hch@lst.de>
Date: 2021-12-09 06:31:40
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Don't hold a reference to ->refcount for each active reference, but just one for all active references. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> --- block/blk-ioc.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 96336c2134efa..9cde3906be3c6 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c@@ -180,10 +180,8 @@ static void put_io_context_active(struct io_context *ioc) { struct io_cq *icq; - if (!atomic_dec_and_test(&ioc->active_ref)) { - put_io_context(ioc); + if (!atomic_dec_and_test(&ioc->active_ref)) return; - } spin_lock_irq(&ioc->lock); hlist_for_each_entry(icq, &ioc->icq_list, ioc_node) {
@@ -335,7 +333,6 @@ int __copy_io(unsigned long clone_flags, struct task_struct *tsk) * Share io context with parent, if CLONE_IO is set */ if (clone_flags & CLONE_IO) { - atomic_long_inc(&ioc->refcount); atomic_inc(&ioc->active_ref); tsk->io_context = ioc; } else if (ioprio_valid(ioc->ioprio)) {
--
2.30.2