f2fs: do checkpoint for the renamed inode

If an inode is renamed, it should be registered as file_lost_pino to conduct
checkpoint at f2fs_sync_file.
Otherwise, the inode cannot be recovered due to no dent_mark in the following
scenario.

Note that, this scenario is from xfstests/322.

1. create "a"
2. fsync "a"
3. rename "a" to "b"
4. fsync "b"
5. Sudden power-cut

After recovery is done, "b" should be seen.
However, the result shows "a", since the recovery procedure does not enter
recover_dentry due to no dent_mark.

The reason is like below.
- The nid of "a" is checkpointed during #2, f2fs_sync_file.
- The inode page for "b" produced by #3 is written without dent_mark by
sync_node_pages.

So, this patch fixes this bug by assinging file_lost_pino to the "a"'s inode.
If the pino is lost, f2fs_sync_file conducts checkpoint, and then recovers
the latest pino and its dentry information for further recovery.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 4 insertions, 6 deletions

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index aa3ddb228f98..a6bdddc33ce2 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -417,9 +417,6 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 }
 
                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
-                down_write(&F2FS_I(old_inode)->i_sem);
-                F2FS_I(old_inode)->i_pino = new_dir->i_ino;
-                up_write(&F2FS_I(old_inode)->i_sem);
 
                 new_inode->i_ctime = CURRENT_TIME;
                 down_write(&F2FS_I(new_inode)->i_sem);
@@ -448,6 +445,10 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 }
         }
 
+        down_write(&F2FS_I(old_inode)->i_sem);
+        file_lost_pino(old_inode);
+        up_write(&F2FS_I(old_inode)->i_sem);
+
         old_inode->i_ctime = CURRENT_TIME;
         mark_inode_dirty(old_inode);
 
@@ -457,9 +458,6 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 if (old_dir != new_dir) {
                         f2fs_set_link(old_inode, old_dir_entry,
                                                 old_dir_page, new_dir);
-                        down_write(&F2FS_I(old_inode)->i_sem);
-                        F2FS_I(old_inode)->i_pino = new_dir->i_ino;
-                        up_write(&F2FS_I(old_inode)->i_sem);
                         update_inode_page(old_inode);
                 } else {
                         kunmap(old_dir_page);