From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: [PATCH 37/48] writeback: make writeback_in_progress() take bdi_writeback instead of backing_dev_info Date: Mon, 23 Mar 2015 00:54:48 -0400 Message-ID: <1427086499-15657-38-git-send-email-tj@kernel.org> References: <1427086499-15657-1-git-send-email-tj@kernel.org> Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=VG35tqciTbKqlt9mn7dRincboMkK4ECrLOrEcMJfsgs=; b=XDEbI9bhIue34eaa/GDdZ7fGyjvBzZh+GhkNjYoADWntH/LSFVIrzgUYapz0RBbVf5 t9513sGCeInkUwPTDU/76hILJq9aZ3awMNrrXRTM4hRGBKg/cU2HkYoG1SGFoNrfWfpE JM7yMW3w5D7xzuUPhFtQsrwmc+vH4wsIqE0UI9pQfS9U+19m3UEUd89+Kh/d3LdU8g/a EFHUClAlemv3nQ42cNUZwuGpBPVm0wSBBfQEatDswXsIjOw726zkRVnbc+zgMk3r0f+a aSXicA2FsHjztq8MoBD5KPVI4zuwGUWqMUGTMbNpkQVrWAEuo1TP1i5PLexVsP0HCseD e/lw== In-Reply-To: <1427086499-15657-1-git-send-email-tj@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, jack@suse.cz, hch@infradead.org, hannes@cmpxchg.org, linux-fsdevel@vger.kernel.org, vgoyal@redhat.com, lizefan@huawei.com, cgroups@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.cz, clm@fb.com, fengguang.wu@intel.com, david@fromorbit.com, gthelen@google.com, Tejun Heo writeback_in_progress() currently takes @bdi and returns whether writeback is in progress on its root wb (bdi_writeback). In preparation for cgroup writeback support, make it take wb instead. While at it, make it an inline function. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo Cc: Jens Axboe Cc: Jan Kara --- fs/fs-writeback.c | 15 +-------------- include/linux/backing-dev.h | 12 +++++++++++- mm/page-writeback.c | 4 ++-- 3 files changed, 14 insertions(+), 17 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index c24d6fd..c342c05 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -53,19 +53,6 @@ struct wb_writeback_work { struct completion *done; /* set if the caller waits */ }; -/** - * writeback_in_progress - determine whether there is writeback in progress - * @bdi: the device's backing_dev_info structure. - * - * Determine whether there is writeback waiting to be handled against a - * backing device. - */ -int writeback_in_progress(struct backing_dev_info *bdi) -{ - return test_bit(WB_writeback_running, &bdi->wb.state); -} -EXPORT_SYMBOL(writeback_in_progress); - static inline struct inode *wb_inode(struct list_head *head) { return list_entry(head, struct inode, i_wb_list); @@ -1465,7 +1452,7 @@ int try_to_writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, enum wb_reason reason) { - if (writeback_in_progress(sb->s_bdi)) + if (writeback_in_progress(&sb->s_bdi->wb)) return 1; if (!down_read_trylock(&sb->s_umount)) diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 81e39ff..216a016 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -156,7 +156,17 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); extern struct backing_dev_info noop_backing_dev_info; -int writeback_in_progress(struct backing_dev_info *bdi); +/** + * writeback_in_progress - determine whether there is writeback in progress + * @wb: bdi_writeback of interest + * + * Determine whether there is writeback waiting to be handled against a + * bdi_writeback. + */ +static inline bool writeback_in_progress(struct bdi_writeback *wb) +{ + return test_bit(WB_writeback_running, &wb->state); +} static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) { diff --git a/mm/page-writeback.c b/mm/page-writeback.c index fa37e73..3e698f4 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1455,7 +1455,7 @@ static void balance_dirty_pages(struct address_space *mapping, break; } - if (unlikely(!writeback_in_progress(bdi))) + if (unlikely(!writeback_in_progress(wb))) bdi_start_background_writeback(bdi); if (!strictlimit) @@ -1573,7 +1573,7 @@ pause: if (!dirty_exceeded && wb->dirty_exceeded) wb->dirty_exceeded = 0; - if (writeback_in_progress(bdi)) + if (writeback_in_progress(wb)) return; /* -- 2.1.0