linux-kernel - [PATCH] f2fs: update inode updating status correctly

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Message-ID: <20161102120834.15178-1-yuchao0@huawei.com>
Date:   Wed, 2 Nov 2016 20:08:34 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs: update inode updating status correctly

We should record updating status of inode only for living inode, for those
unlinked inode it needs to clear ino cache, otherwise after the ino of
unlinked inode was been reused, it will cause unneeded node page writing
during ->fsync.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/inode.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 7b5e402..36f8a9b 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -409,10 +409,15 @@ void f2fs_evict_inode(struct inode *inode)
 	invalidate_mapping_pages(NODE_MAPPING(sbi), inode->i_ino, inode->i_ino);
 	if (xnid)
 		invalidate_mapping_pages(NODE_MAPPING(sbi), xnid, xnid);
-	if (is_inode_flag_set(inode, FI_APPEND_WRITE))
-		add_ino_entry(sbi, inode->i_ino, APPEND_INO);
-	if (is_inode_flag_set(inode, FI_UPDATE_WRITE))
-		add_ino_entry(sbi, inode->i_ino, UPDATE_INO);
+	if (inode->i_nlink) {
+		if (is_inode_flag_set(inode, FI_APPEND_WRITE))
+			add_ino_entry(sbi, inode->i_ino, APPEND_INO);
+		if (is_inode_flag_set(inode, FI_UPDATE_WRITE))
+			add_ino_entry(sbi, inode->i_ino, UPDATE_INO);
+	} else {
+		remove_ino_entry(sbi, inode->i_ino, APPEND_INO);
+		remove_ino_entry(sbi, inode->i_ino, UPDATE_INO);
+	}
 	if (is_inode_flag_set(inode, FI_FREE_NID)) {
 		alloc_nid_failed(sbi, inode->i_ino);
 		clear_inode_flag(inode, FI_FREE_NID);
-- 
2.8.2.311.gee88674