ext4: fix online resizing for ext3-compat file systems

Commit fb0a387dcdc restricts block allocations for indirect-mapped
files to block groups less than s_blockfile_groups.  However, the
online resizing code wasn't setting s_blockfile_groups, so the newly
added block groups were not available for non-extent mapped files.

Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index e3498534a2c1..08d2312c0fd4 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1341,6 +1341,8 @@ static void ext4_update_super(struct super_block *sb,
 
         /* Update the global fs size fields */
         sbi->s_groups_count += flex_gd->count;
+        sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
+                        (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
 
         /* Update the reserved block counts only once the new group is
          * active. */