ext4: do not set extents feature from the kernel

We've talked for a while about getting rid of any feature-
setting from the kernel; this gets rid of the code which would
set the INCOMPAT_EXTENTS flag on the first file write when mounted
as ext4[dev].

With this patch, if the extents feature is not already set on disk,
then mounting as ext4 will fall back to noextents with a warning,
and if -o extents is explicitly requested, the mount will fail,
also with warning.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 1 insertions, 5 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 8b0a10acd708..a92eb305344f 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -836,14 +836,10 @@ got:
                 goto fail_free_drop;
 
         if (test_opt(sb, EXTENTS)) {
-                /* set extent flag only for diretory, file and normal symlink*/
+                /* set extent flag only for directory, file and normal symlink*/
                 if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
                         EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
                         ext4_ext_tree_init(handle, inode);
-                        err = ext4_update_incompat_feature(handle, sb,
-                                        EXT4_FEATURE_INCOMPAT_EXTENTS);
-                        if (err)
-                                goto fail_free_drop;
                 }
         }