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From: Chengguang Xu <cgxu519@mykernel.net>
To: miklos@szeredi.hu, amir73il@gmail.com, jack@suse.cz
Cc: linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Chengguang Xu <cgxu519@mykernel.net>
Subject: [RFC PATCH v2 8/8] ovl: implement containerized syncfs for overlayfs
Date: Sun, 25 Oct 2020 11:41:17 +0800
Message-ID: <20201025034117.4918-9-cgxu519@mykernel.net> (raw)
In-Reply-To: <20201025034117.4918-1-cgxu519@mykernel.net>

Now overlayfs can only sync dirty inode during
syncfs, so remove unnecessary sync_filesystem()
on upper file system.

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
---
 fs/overlayfs/super.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 1d04117fb6ad..df33e8c8f1d0 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -271,8 +271,7 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
 	 * Not called for sync(2) call or an emergency sync (SB_I_SKIP_SYNC).
 	 * All the super blocks will be iterated, including upper_sb.
 	 *
-	 * If this is a syncfs(2) call, then we do need to call
-	 * sync_filesystem() on upper_sb, but enough if we do it when being
+	 * If this is a syncfs(2) call, it will be enough we do it when being
 	 * called with wait == 1.
 	 */
 	if (!wait)
@@ -281,7 +280,10 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
 	upper_sb = ovl_upper_mnt(ofs)->mnt_sb;
 
 	down_read(&upper_sb->s_umount);
-	ret = sync_filesystem(upper_sb);
+	if (upper_sb->s_op->sync_fs)
+		ret = upper_sb->s_op->sync_fs(upper_sb, wait);
+	if (!ret)
+		ret = sync_blockdev(upper_sb->s_bdev);
 	up_read(&upper_sb->s_umount);
 
 	return ret;
-- 
2.26.2



  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-25  3:41 [RFC PATCH v2 0/8] " Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 1/8] ovl: setup overlayfs' private bdi Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 2/8] ovl: implement ->writepages operation Chengguang Xu
2020-11-02 17:17   ` Jan Kara
2020-11-04 12:18     ` Chengguang Xu
2020-11-05 13:55       ` Jan Kara
2020-11-06  5:57         ` Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 3/8] ovl: implement overlayfs' ->evict_inode operation Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 4/8] ovl: mark overlayfs' inode dirty on modification Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 5/8] ovl: mark overlayfs' inode dirty on shared writable mmap Chengguang Xu
2020-11-02 17:30   ` Jan Kara
2020-11-04 11:54     ` Chengguang Xu
2020-11-05 14:03       ` Jan Kara
2020-11-05 14:21         ` Amir Goldstein
2020-11-05 15:54           ` Jan Kara
2020-11-06  2:41             ` Chengguang Xu
2020-11-06  8:50               ` Jan Kara
2020-11-06  9:47                 ` Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 6/8] ovl: implement overlayfs' ->write_inode operation Chengguang Xu
2020-10-25  3:41 ` [RFC PATCH v2 7/8] ovl: cache dirty overlayfs' inode Chengguang Xu
2020-10-25  3:41 ` Chengguang Xu [this message]
2020-10-30 15:46 ` [RFC PATCH v2 0/8] implement containerized syncfs for overlayfs Miklos Szeredi
2020-10-31 12:22   ` Chengguang Xu

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