ext4: add the basic function for inline data support

Implement inline data with xattr.

Now we use "system.data" to store xattr, and the xattr will
be extended if the i_size is increased while we don't release
the space during truncate.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index befa005711a1..e23f114e2cfe 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3706,8 +3706,10 @@ static inline void ext4_iget_extra_inode(struct inode *inode,
 {
         __le32 *magic = (void *)raw_inode +
                         EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize;
-        if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC))
+        if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) {
                 ext4_set_inode_state(inode, EXT4_STATE_XATTR);
+                ext4_find_inline_data_nolock(inode);
+        }
 }
 
 struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
@@ -3780,6 +3782,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
         set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
 
         ext4_clear_state_flags(ei);     /* Only relevant on 32-bit archs */
+        ei->i_inline_off = 0;
         ei->i_dir_start_lookup = 0;
         ei->i_dtime = le32_to_cpu(raw_inode->i_dtime);
         /* We now have enough fields to check if the inode was active or not.