ext4: make ext4_es_remove_extent() return void

Now ext4_es_remove_extent() never fails, so make it return void.

Signed-off-by: Baokun Li <[e-mail]>
Reviewed-by: Jan Kara <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Theodore Ts'o <[e-mail]>

fs/ext4/extents.c

···
 
 	last_block = (inode->i_size + sb->s_blocksize - 1)
 			>> EXT4_BLOCK_SIZE_BITS(sb);
-retry:
-	err = ext4_es_remove_extent(inode, last_block,
-				    EXT_MAX_BLOCKS - last_block);
-	if (err == -ENOMEM) {
-		memalloc_retry_wait(GFP_ATOMIC);
-		goto retry;
-	}
-	if (err)
-		return err;
+	ext4_es_remove_extent(inode, last_block, EXT_MAX_BLOCKS - last_block);
+
 retry_remove_space:
 	err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
 	if (err == -ENOMEM) {
···
 
 	down_write(&EXT4_I(inode)->i_data_sem);
 	ext4_discard_preallocations(inode, 0);
-
-	ret = ext4_es_remove_extent(inode, punch_start,
-				    EXT_MAX_BLOCKS - punch_start);
-	if (ret) {
-		up_write(&EXT4_I(inode)->i_data_sem);
-		goto out_stop;
-	}
+	ext4_es_remove_extent(inode, punch_start, EXT_MAX_BLOCKS - punch_start);
 
 	ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1);
 	if (ret) {
···
 		ext4_free_ext_path(path);
 	}
 
-	ret = ext4_es_remove_extent(inode, offset_lblk,
-			EXT_MAX_BLOCKS - offset_lblk);
-	if (ret) {
-		up_write(&EXT4_I(inode)->i_data_sem);
-		goto out_stop;
-	}
+	ext4_es_remove_extent(inode, offset_lblk, EXT_MAX_BLOCKS - offset_lblk);
 
 	/*
 	 * if offset_lblk lies in a hole which is at start of file, use
···
 	BUG_ON(!inode_is_locked(inode1));
 	BUG_ON(!inode_is_locked(inode2));
 
-	*erp = ext4_es_remove_extent(inode1, lblk1, count);
-	if (unlikely(*erp))
-		return 0;
-	*erp = ext4_es_remove_extent(inode2, lblk2, count);
-	if (unlikely(*erp))
-		return 0;
+	ext4_es_remove_extent(inode1, lblk1, count);
+	ext4_es_remove_extent(inode2, lblk2, count);
 
 	while (count) {
 		struct ext4_extent *ex1, *ex2, tmp_ex;

fs/ext4/extents_status.c

···
  * @len - number of blocks to remove
  *
  * Reduces block/cluster reservation count and for bigalloc cancels pending
- * reservations as needed. Returns 0 on success, error code on failure.
+ * reservations as needed.
  */
-int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
-			  ext4_lblk_t len)
+void ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
+			   ext4_lblk_t len)
 {
 	ext4_lblk_t end;
 	int err = 0;
···
 	struct extent_status *es = NULL;
 
 	if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY)
-		return 0;
+		return;
 
 	trace_ext4_es_remove_extent(inode, lblk, len);
 	es_debug("remove [%u/%u) from extent status tree of inode %lu\n",
 		 lblk, len, inode->i_ino);
 
 	if (!len)
-		return err;
+		return;
 
 	end = lblk + len - 1;
 	BUG_ON(end < lblk);
···
 
 	ext4_es_print_tree(inode);
 	ext4_da_release_space(inode, reserved);
-	return 0;
+	return;
 }
 
 static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan,

fs/ext4/extents_status.h

···
 extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
 				 ext4_lblk_t len, ext4_fsblk_t pblk,
 				 unsigned int status);
-extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
-				 ext4_lblk_t len);
+extern void ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
+				  ext4_lblk_t len);
 extern void ext4_es_find_extent_range(struct inode *inode,
 				      int (*match_fn)(struct extent_status *es),
 				      ext4_lblk_t lblk, ext4_lblk_t end,

fs/ext4/inline.c

···
 		 * the extent status cache must be cleared to avoid leaving
 		 * behind stale delayed allocated extent entries
 		 */
-		if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
-retry:
-			err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
-			if (err == -ENOMEM) {
-				memalloc_retry_wait(GFP_ATOMIC);
-				goto retry;
-			}
-			if (err)
-				goto out_error;
-		}
+		if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
+			ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
 
 		/* Clear the content in the xattr space. */
 		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {

fs/ext4/inode.c

···
 		down_write(&EXT4_I(inode)->i_data_sem);
 		ext4_discard_preallocations(inode, 0);
 
-		ret = ext4_es_remove_extent(inode, first_block,
-					    stop_block - first_block);
-		if (ret) {
-			up_write(&EXT4_I(inode)->i_data_sem);
-			goto out_stop;
-		}
+		ext4_es_remove_extent(inode, first_block,
+				      stop_block - first_block);
 
 		if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
 			ret = ext4_ext_remove_space(inode, first_block,