ext4: fix the number of credits needed for ext4_ext_migrate()

The migration ioctl creates a temporary inode.  Since this inode is
never linked to a directory, we don't need to reserve journal credits
required for modifying the directory.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

1 files changed, 7 insertions, 4 deletions

diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 4e4fcfd342f8..480acf4a085f 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -456,11 +456,14 @@ int ext4_ext_migrate(struct inode *inode)
                  */
                 return retval;
 
+        /*
+         * Worst case we can touch the allocation bitmaps, a bgd
+         * block, and a block to link in the orphan list.  We do need
+         * need to worry about credits for modifying the quota inode.
+         */
         handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
-                                        EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
-                                        EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
-                                        EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)
-                                        + 1);
+                4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));
+
         if (IS_ERR(handle)) {
                 retval = PTR_ERR(handle);
                 return retval;