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Tue, 14 Oct 2025 12:10:42 +0000 (GMT) From: Kundan Kumar To: jaegeuk@kernel.org, chao@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, miklos@szeredi.hu, agruenba@redhat.com, trondmy@kernel.org, anna@kernel.org, akpm@linux-foundation.org, willy@infradead.org, mcgrof@kernel.org, clm@meta.com, david@fromorbit.com, amir73il@gmail.com, axboe@kernel.dk, hch@lst.de, ritesh.list@gmail.com, djwong@kernel.org, dave@stgolabs.net, wangyufei@vivo.com Cc: linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, gfs2@lists.linux.dev, linux-nfs@vger.kernel.org, linux-mm@kvack.org, gost.dev@samsung.com, kundan.kumar@samsung.com, anuj20.g@samsung.com, vishak.g@samsung.com, joshi.k@samsung.com Subject: [PATCH v2 07/16] writeback: modify sync related functions to iterate over all writeback contexts Date: Tue, 14 Oct 2025 17:38:36 +0530 Message-Id: <20251014120845.2361-8-kundan.kumar@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20251014120845.2361-1-kundan.kumar@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CMS-MailID: 20251014121048epcas5p4e8665c2e4e12367465aa4d4ec1de84d9 X-Msg-Generator: CA Content-Type: text/plain; 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Signed-off-by: Kundan Kumar Signed-off-by: Anuj Gupta --- fs/fs-writeback.c | 66 +++++++++++++++++++++++++++++++---------------- 1 file changed, 44 insertions(+), 22 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 432f392c8256..7bf1f6c1c0ba 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -2753,11 +2753,13 @@ static void wait_sb_inodes(struct super_block *sb) mutex_unlock(&sb->s_sync_lock); } -static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, - enum wb_reason reason, bool skip_if_busy) +static void __writeback_inodes_sb_nr_ctx(struct super_block *sb, + unsigned long nr, + enum wb_reason reason, + bool skip_if_busy, + struct bdi_writeback_ctx *bdi_wb_ctx) { - struct backing_dev_info *bdi = sb->s_bdi; - DEFINE_WB_COMPLETION(done, bdi->wb_ctx[0]); + DEFINE_WB_COMPLETION(done, bdi_wb_ctx); struct wb_writeback_work work = { .sb = sb, .sync_mode = WB_SYNC_NONE, @@ -2767,13 +2769,23 @@ static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, .reason = reason, }; + bdi_split_work_to_wbs(sb->s_bdi, bdi_wb_ctx, &work, skip_if_busy); + wb_wait_for_completion(&done); +} + +static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, + enum wb_reason reason, bool skip_if_busy) +{ + struct backing_dev_info *bdi = sb->s_bdi; + struct bdi_writeback_ctx *bdi_wb_ctx; + if (!bdi_has_dirty_io(bdi) || bdi == &noop_backing_dev_info) return; WARN_ON(!rwsem_is_locked(&sb->s_umount)); - bdi_split_work_to_wbs(sb->s_bdi, bdi->wb_ctx[0], &work, - skip_if_busy); - wb_wait_for_completion(&done); + for_each_bdi_wb_ctx(bdi, bdi_wb_ctx) + __writeback_inodes_sb_nr_ctx(sb, nr, reason, skip_if_busy, + bdi_wb_ctx); } /** @@ -2826,17 +2838,11 @@ void try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) } EXPORT_SYMBOL(try_to_writeback_inodes_sb); -/** - * sync_inodes_sb - sync sb inode pages - * @sb: the superblock - * - * This function writes and waits on any dirty inode belonging to this - * super_block. - */ -void sync_inodes_sb(struct super_block *sb) +static void sync_inodes_bdi_wb_ctx(struct super_block *sb, + struct backing_dev_info *bdi, + struct bdi_writeback_ctx *bdi_wb_ctx) { - struct backing_dev_info *bdi = sb->s_bdi; - DEFINE_WB_COMPLETION(done, bdi->wb_ctx[0]); + DEFINE_WB_COMPLETION(done, bdi_wb_ctx); struct wb_writeback_work work = { .sb = sb, .sync_mode = WB_SYNC_ALL, @@ -2847,6 +2853,25 @@ void sync_inodes_sb(struct super_block *sb) .for_sync = 1, }; + /* protect against inode wb switch, see inode_switch_wbs_work_fn() */ + bdi_down_write_wb_ctx_switch_rwsem(bdi_wb_ctx); + bdi_split_work_to_wbs(bdi, bdi_wb_ctx, &work, false); + wb_wait_for_completion(&done); + bdi_up_write_wb_ctx_switch_rwsem(bdi_wb_ctx); +} + +/** + * sync_inodes_sb - sync sb inode pages + * @sb: the superblock + * + * This function writes and waits on any dirty inode belonging to this + * super_block. + */ +void sync_inodes_sb(struct super_block *sb) +{ + struct backing_dev_info *bdi = sb->s_bdi; + struct bdi_writeback_ctx *bdi_wb_ctx; + /* * Can't skip on !bdi_has_dirty() because we should wait for !dirty * inodes under writeback and I_DIRTY_TIME inodes ignored by @@ -2856,11 +2881,8 @@ void sync_inodes_sb(struct super_block *sb) return; WARN_ON(!rwsem_is_locked(&sb->s_umount)); - /* protect against inode wb switch, see inode_switch_wbs_work_fn() */ - bdi_down_write_wb_ctx_switch_rwsem(bdi->wb_ctx[0]); - bdi_split_work_to_wbs(bdi, bdi->wb_ctx[0], &work, false); - wb_wait_for_completion(&done); - bdi_up_write_wb_ctx_switch_rwsem(bdi->wb_ctx[0]); + for_each_bdi_wb_ctx(bdi, bdi_wb_ctx) + sync_inodes_bdi_wb_ctx(sb, bdi, bdi_wb_ctx); wait_sb_inodes(sb); } -- 2.25.1