ext4: split ext4_ind_truncate from ext4_truncate

We are about to move all indirect inode functions to a new file.
Before we do that, let's split ext4_ind_truncate() out of ext4_truncate()
leaving only generic code in the latter, so we will be able to move
ext4_ind_truncate() to the new file.
Signed-off-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/ext4.h

@@ -1834,6 +1834,8 @@ extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
 extern void ext4_da_update_reserve_space(struct inode *inode,
 					int used, int quota_claim);
+extern void ext4_ind_truncate(struct inode *inode);
+
 /* ioctl.c */
 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);

fs/ext4/inode.c

@@ -4471,19 +4471,6 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
  */
 void ext4_truncate(struct inode *inode)
 {
-	handle_t *handle;
-	struct ext4_inode_info *ei = EXT4_I(inode);
-	__le32 *i_data = ei->i_data;
-	int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb);
-	struct address_space *mapping = inode->i_mapping;
-	ext4_lblk_t offsets[4];
-	Indirect chain[4];
-	Indirect *partial;
-	__le32 nr = 0;
-	int n = 0;
-	ext4_lblk_t last_block, max_block;
-	unsigned blocksize = inode->i_sb->s_blocksize;
-
 	trace_ext4_truncate_enter(inode);
 
 	if (!ext4_can_truncate(inode))
@@ -4494,11 +4481,28 @@ void ext4_truncate(struct inode *inode)
 	if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
 		ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
 
-	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
+	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
 		ext4_ext_truncate(inode);
+	else
+		ext4_ind_truncate(inode);
+
 	trace_ext4_truncate_exit(inode);
-		return;
-	}
+}
+
+void ext4_ind_truncate(struct inode *inode)
+{
+	handle_t *handle;
+	struct ext4_inode_info *ei = EXT4_I(inode);
+	__le32 *i_data = ei->i_data;
+	int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb);
+	struct address_space *mapping = inode->i_mapping;
+	ext4_lblk_t offsets[4];
+	Indirect chain[4];
+	Indirect *partial;
+	__le32 nr = 0;
+	int n = 0;
+	ext4_lblk_t last_block, max_block;
+	unsigned blocksize = inode->i_sb->s_blocksize;
 
 	handle = start_transaction(inode);
 	if (IS_ERR(handle))