ext4: add online resizing support for meta_bg and 64-bit file systems

This patch adds support for resizing file systems with the meta_bg and
64bit features.

[ Added a fix by tytso to fix a divide by zero when resizing a
  filesystem from 14 TB to 18TB.  Also fixed overhead accounting for
  meta_bg file systems.]

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 0 insertions, 15 deletions

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7f7dad787603..8b84fe28ccaf 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -365,26 +365,11 @@ group_add_out:
                         return -EOPNOTSUPP;
                 }
 
-                if (EXT4_HAS_INCOMPAT_FEATURE(sb,
-                               EXT4_FEATURE_INCOMPAT_META_BG)) {
-                        ext4_msg(sb, KERN_ERR,
-                                 "Online resizing not (yet) supported with meta_bg");
-                        return -EOPNOTSUPP;
-                }
-
                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
                                    sizeof(__u64))) {
                         return -EFAULT;
                 }
 
-                if (n_blocks_count > MAX_32_NUM &&
-                    !EXT4_HAS_INCOMPAT_FEATURE(sb,
-                                               EXT4_FEATURE_INCOMPAT_64BIT)) {
-                        ext4_msg(sb, KERN_ERR,
-                                 "File system only supports 32-bit block numbers");
-                        return -EOPNOTSUPP;
-                }
-
                 err = ext4_resize_begin(sb);
                 if (err)
                         return err;