ext4: Don't set EXTENTS_FL flag for fast symlinks

For fast symbolic links, the file content is stored in the i_block[]
array, which is not compatible with the new file extents format.
e2fsck reports error on such files because EXTENTS_FL is set.
Don't set the EXTENTS_FL flag when creating fast symlinks.

In the case of file migration, skip fast symbolic links.

Signed-off-by: Valerie Clement <valerie.clement@bull.net>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 3ebc2332f52e..9ee1f7cfb2c5 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -414,6 +414,12 @@ int ext4_ext_migrate(struct inode *inode, struct file *filp,
         if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
                 return -EINVAL;
 
+        if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
+                /*
+                 * don't migrate fast symlink
+                 */
+                return retval;
+
         down_write(&EXT4_I(inode)->i_data_sem);
         handle = ext4_journal_start(inode,
                                         EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +