From: Chao Yu <yuchao0@huawei.com>
Date: Wed, 3 Oct 2018 14:32:44 +0000 (+0800)
Subject: f2fs: fix to recover cold bit of inode block during POR
X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~6096^2~19
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=ef2a007134b4eaa39264c885999f296577bc87d2;p=linux.git

f2fs: fix to recover cold bit of inode block during POR

Testcase to reproduce this bug:
1. mkfs.f2fs /dev/sdd
2. mount -t f2fs /dev/sdd /mnt/f2fs
3. touch /mnt/f2fs/file
4. sync
5. chattr +A /mnt/f2fs/file
6. xfs_io -f /mnt/f2fs/file -c "fsync"
7. godown /mnt/f2fs
8. umount /mnt/f2fs
9. mount -t f2fs /dev/sdd /mnt/f2fs
10. chattr -A /mnt/f2fs/file
11. xfs_io -f /mnt/f2fs/file -c "fsync"
12. umount /mnt/f2fs
13. mount -t f2fs /dev/sdd /mnt/f2fs
14. lsattr /mnt/f2fs/file

-----------------N- /mnt/f2fs/file

But actually, we expect the corrct result is:

-------A---------N- /mnt/f2fs/file

The reason is in step 9) we missed to recover cold bit flag in inode
block, so later, in fsync, we will skip write inode block due to below
condition check, result in lossing data in another SPOR.

f2fs_fsync_node_pages()
	if (!IS_DNODE(page) || !is_cold_node(page))
		continue;

Note that, I guess that some non-dir inode has already lost cold bit
during POR, so in order to reenable recovery for those inode, let's
try to recover cold bit in f2fs_iget() to save more fsynced data.

Fixes: c56675750d7c ("f2fs: remove unneeded set_cold_node()")
Cc: <stable@vger.kernel.org> 4.17+
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 4ee9d6c4b719..57a7a15239d6 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -365,6 +365,12 @@ static int do_read_inode(struct inode *inode)
 	if (f2fs_has_inline_data(inode) && !f2fs_exist_data(inode))
 		__recover_inline_status(inode, node_page);
 
+	/* try to recover cold bit for non-dir inode */
+	if (!S_ISDIR(inode->i_mode) && !is_cold_node(node_page)) {
+		set_cold_node(node_page, false);
+		set_page_dirty(node_page);
+	}
+
 	/* get rdev by using inline_info */
 	__get_inode_rdev(inode, ri);
 
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 8f5719767178..8c0367cfb1bb 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2549,7 +2549,7 @@ retry:
 	if (!PageUptodate(ipage))
 		SetPageUptodate(ipage);
 	fill_node_footer(ipage, ino, ino, 0, true);
-	set_cold_node(page, false);
+	set_cold_node(ipage, false);
 
 	src = F2FS_INODE(page);
 	dst = F2FS_INODE(ipage);