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Message-ID: <20211122030038.1938875-8-cgxu519@mykernel.net>
Date: Mon, 22 Nov 2021 11:00:38 +0800
From: Chengguang Xu <cgxu519@...ernel.net>
To: miklos@...redi.hu, jack@...e.cz, amir73il@...il.com
Cc: linux-unionfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Chengguang Xu <charliecgxu@...cent.com>
Subject: [RFC PATCH V6 7/7] ovl: implement containerized syncfs for overlayfs
From: Chengguang Xu <charliecgxu@...cent.com>
Now overlayfs can only sync own dirty inodes during syncfs,
so remove unnecessary sync_filesystem() on upper file system.
Signed-off-by: Chengguang Xu <charliecgxu@...cent.com>
---
fs/overlayfs/super.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index ccffcd96491d..213b795a6a86 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -292,18 +292,14 @@ 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
- * called with wait == 1.
*/
- if (!wait)
- return 0;
-
upper_sb = ovl_upper_mnt(ofs)->mnt_sb;
-
down_read(&upper_sb->s_umount);
- ret = sync_filesystem(upper_sb);
+ if (wait)
+ wait_sb_inodes(upper_sb);
+ if (upper_sb->s_op->sync_fs)
+ upper_sb->s_op->sync_fs(upper_sb, wait);
+ ret = ovl_sync_upper_blockdev(upper_sb, wait);
up_read(&upper_sb->s_umount);
return ret;
--
2.27.0
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