nilfs2: zero fill unused portion of super root block
The super root block is newly-allocated each time it is written back
to disk, so unused portion of the block should be cleared.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 2cc8c08..699170e 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -596,6 +596,16 @@
raw_inode->i_flags = cpu_to_le32(ii->i_flags);
raw_inode->i_generation = cpu_to_le32(inode->i_generation);
+ if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+
+ /* zero-fill unused portion in the case of super root block */
+ raw_inode->i_xattr = 0;
+ raw_inode->i_pad = 0;
+ memset((void *)raw_inode + sizeof(*raw_inode), 0,
+ nilfs->ns_inode_size - sizeof(*raw_inode));
+ }
+
if (has_bmap)
nilfs_bmap_write(ii->i_bmap, raw_inode);
else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))