ext4: Introduce ext4_update_*_feature

Introduce ext4_update_*_feature and use them instead
of opencoding.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

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);

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
  */

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,