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

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index e3498534a2c1a7da840cd7fe8846ed9b76200f5b..08d2312c0fd4318adcfb4363533bdbfa8cdfb819 100644 (file)
--- 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. */