From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A0B5C10F03 for ; Wed, 13 Mar 2019 15:45:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 41D6A206DF for ; Wed, 13 Mar 2019 15:45:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726777AbfCMPpv (ORCPT ); Wed, 13 Mar 2019 11:45:51 -0400 Received: from mx2.suse.de ([195.135.220.15]:60730 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725856AbfCMPpt (ORCPT ); Wed, 13 Mar 2019 11:45:49 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id C1895B117 for ; Wed, 13 Mar 2019 15:45:47 +0000 (UTC) Received: by ds.suse.cz (Postfix, from userid 10065) id 87DE1DA875; Wed, 13 Mar 2019 16:47:03 +0100 (CET) From: David Sterba To: linux-btrfs@vger.kernel.org Cc: David Sterba Subject: [PATCH 2/9] btrfs: use assertion helpers for spinning writers Date: Wed, 13 Mar 2019 16:47:03 +0100 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Use the helpers where open coded. On non-debug builds, the warnings will not trigger and extent_buffer::spining_writers become unused and can be moved to the appropriate section, saving a few bytes. Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 5 ++++- fs/btrfs/extent_io.h | 2 +- fs/btrfs/locking.c | 16 ++++++---------- 3 files changed, 11 insertions(+), 12 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index ca259c75bbcd..11a95919bb3e 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4673,7 +4673,6 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, atomic_set(&eb->blocking_readers, 0); atomic_set(&eb->blocking_writers, 0); atomic_set(&eb->spinning_readers, 0); - atomic_set(&eb->spinning_writers, 0); eb->lock_nested = 0; init_waitqueue_head(&eb->write_lock_wq); init_waitqueue_head(&eb->read_lock_wq); @@ -4691,6 +4690,10 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, > MAX_INLINE_EXTENT_BUFFER_SIZE); BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); +#ifdef CONFIG_BTRFS_DEBUG + atomic_set(&eb->spinning_writers, 0); +#endif + return eb; } diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 08749e0b9c32..c5eb261c1ea9 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -152,7 +152,6 @@ struct extent_buffer { atomic_t blocking_writers; atomic_t blocking_readers; atomic_t spinning_readers; - atomic_t spinning_writers; short lock_nested; /* >= 0 if eb belongs to a log tree, -1 otherwise */ short log_index; @@ -171,6 +170,7 @@ struct extent_buffer { wait_queue_head_t read_lock_wq; struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; #ifdef CONFIG_BTRFS_DEBUG + atomic_t spinning_writers; struct list_head leak_list; #endif }; diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c index 13ef1decdea6..a5a3c5118f61 100644 --- a/fs/btrfs/locking.c +++ b/fs/btrfs/locking.c @@ -64,8 +64,7 @@ void btrfs_set_lock_blocking_write(struct extent_buffer *eb) if (eb->lock_nested && current->pid == eb->lock_owner) return; if (atomic_read(&eb->blocking_writers) == 0) { - WARN_ON(atomic_read(&eb->spinning_writers) != 1); - atomic_dec(&eb->spinning_writers); + btrfs_assert_spinning_writers_put(eb); btrfs_assert_tree_locked(eb); atomic_inc(&eb->blocking_writers); write_unlock(&eb->lock); @@ -101,8 +100,7 @@ void btrfs_clear_lock_blocking_write(struct extent_buffer *eb) return; BUG_ON(atomic_read(&eb->blocking_writers) != 1); write_lock(&eb->lock); - WARN_ON(atomic_read(&eb->spinning_writers)); - atomic_inc(&eb->spinning_writers); + btrfs_assert_spinning_writers_get(eb); /* atomic_dec_and_test implies a barrier */ if (atomic_dec_and_test(&eb->blocking_writers)) cond_wake_up_nomb(&eb->write_lock_wq); @@ -200,7 +198,7 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb) return 0; } atomic_inc(&eb->write_locks); - atomic_inc(&eb->spinning_writers); + btrfs_assert_spinning_writers_get(eb); eb->lock_owner = current->pid; return 1; } @@ -266,8 +264,7 @@ void btrfs_tree_lock(struct extent_buffer *eb) write_unlock(&eb->lock); goto again; } - WARN_ON(atomic_read(&eb->spinning_writers)); - atomic_inc(&eb->spinning_writers); + btrfs_assert_spinning_writers_get(eb); atomic_inc(&eb->write_locks); eb->lock_owner = current->pid; } @@ -286,14 +283,13 @@ void btrfs_tree_unlock(struct extent_buffer *eb) atomic_dec(&eb->write_locks); if (blockers) { - WARN_ON(atomic_read(&eb->spinning_writers)); + btrfs_assert_no_spinning_writers(eb); atomic_dec(&eb->blocking_writers); /* Use the lighter barrier after atomic */ smp_mb__after_atomic(); cond_wake_up_nomb(&eb->write_lock_wq); } else { - WARN_ON(atomic_read(&eb->spinning_writers) != 1); - atomic_dec(&eb->spinning_writers); + btrfs_assert_spinning_writers_put(eb); write_unlock(&eb->lock); } } -- 2.20.1