3 files changed, 70 insertions, 7 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 7b5cfa62b663..00b152b92480 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -748,13 +748,10 @@ got:
         if (test_opt(sb, EXTENTS)) {
                 EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
                 ext4_ext_tree_init(handle, inode);
-                if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
-                        err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
-                        if (err) goto fail;
-                        EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS);
-                        BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "call ext4_journal_dirty_metadata");
-                        err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh);
-                }
+                err = ext4_update_incompat_feature(handle, sb,
+                                                EXT4_FEATURE_INCOMPAT_EXTENTS);
+                if (err)
+                        goto fail;
         }
 
         ext4_debug("allocating inode %lu\n", inode->i_ino);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index df8842b43544..4d7f33f79552 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -373,6 +373,66 @@ void ext4_update_dynamic_rev(struct super_block *sb)
          */
 }
 
+int ext4_update_compat_feature(handle_t *handle,
+                                        struct super_block *sb, __u32 compat)
+{
+        int err = 0;
+        if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
+                err = ext4_journal_get_write_access(handle,
+                                EXT4_SB(sb)->s_sbh);
+                if (err)
+                        return err;
+                EXT4_SET_COMPAT_FEATURE(sb, compat);
+                sb->s_dirt = 1;
+                handle->h_sync = 1;
+                BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
+                                        "call ext4_journal_dirty_met adata");
+                err = ext4_journal_dirty_metadata(handle,
+                                EXT4_SB(sb)->s_sbh);
+        }
+        return err;
+}
+
+int ext4_update_rocompat_feature(handle_t *handle,
+                                        struct super_block *sb, __u32 rocompat)
+{
+        int err = 0;
+        if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
+                err = ext4_journal_get_write_access(handle,
+                                EXT4_SB(sb)->s_sbh);
+                if (err)
+                        return err;
+                EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
+                sb->s_dirt = 1;
+                handle->h_sync = 1;
+                BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
+                                        "call ext4_journal_dirty_met adata");
+                err = ext4_journal_dirty_metadata(handle,
+                                EXT4_SB(sb)->s_sbh);
+        }
+        return err;
+}
+
+int ext4_update_incompat_feature(handle_t *handle,
+                                        struct super_block *sb, __u32 incompat)
+{
+        int err = 0;
+        if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
+                err = ext4_journal_get_write_access(handle,
+                                EXT4_SB(sb)->s_sbh);
+                if (err)
+                        return err;
+                EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
+                sb->s_dirt = 1;
+                handle->h_sync = 1;
+                BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
+                                        "call ext4_journal_dirty_met adata");
+                err = ext4_journal_dirty_metadata(handle,
+                                EXT4_SB(sb)->s_sbh);
+        }
+        return err;
+}
+
 /*
  * Open the external journal device
  */
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index e1103c2a0d42..429dbfc851ea 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -989,6 +989,12 @@ extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
         __attribute__ ((format (printf, 3, 4)));
 extern void ext4_update_dynamic_rev (struct super_block *sb);
+extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
+                                        __u32 compat);
+extern int ext4_update_rocompat_feature(handle_t *handle,
+                                        struct super_block *sb, __u32 rocompat);
+extern int ext4_update_incompat_feature(handle_t *handle,
+                                        struct super_block *sb, __u32 incompat);
 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
                                       struct ext4_group_desc *bg);
 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,