ext4: make ext4_es_insert_delayed_block() return void

Now it never fails when inserting a delay extent, so the return value in
ext4_es_insert_delayed_block is no longer necessary, let it return void.

[ Fixed bug which caused system hangs during bigalloc test runs.  See
 https://lore.kernel.org/r/20230612030405.GH1436857@mit.edu for more
 details.  -- TYT ]

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230424033846.4732-11-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Author: LiBaokun96

fs/ext4/extents_status.c

@@ -2016,11 +2016,9 @@ bool ext4_is_pending(struct inode *inode, ext4_lblk_t lblk)
  * @lblk - logical block to be added
  * @allocated - indicates whether a physical cluster has been allocated for
  *              the logical cluster that contains the block
- *
- * Returns 0 on success, negative error code on failure.
  */
-int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
-				 bool allocated)
+void ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
+				  bool allocated)
 {
 	struct extent_status newes;
 	int err1 = 0;
@@ -2029,7 +2027,7 @@ int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
 	struct extent_status *es2 = NULL;
 
 	if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY)
-		return 0;
+		return;
 
 	es_debug("add [%u/1) delayed to extent status tree of inode %lu\n",
 		 lblk, inode->i_ino);
@@ -2071,7 +2069,7 @@ int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
 
 	ext4_es_print_tree(inode);
 	ext4_print_pending_tree(inode);
-	return 0;
+	return;
 }
 
 /*

fs/ext4/extents_status.h

@@ -249,8 +249,8 @@ extern void ext4_exit_pending(void);
 extern void ext4_init_pending_tree(struct ext4_pending_tree *tree);
 extern void ext4_remove_pending(struct inode *inode, ext4_lblk_t lblk);
 extern bool ext4_is_pending(struct inode *inode, ext4_lblk_t lblk);
-extern int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
-					bool allocated);
+extern void ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
+					 bool allocated);
 extern unsigned int ext4_es_delayed_clu(struct inode *inode, ext4_lblk_t lblk,
 					ext4_lblk_t len);
 extern void ext4_clear_inode_es(struct inode *inode);

fs/ext4/inode.c

@@ -1630,7 +1630,6 @@ static int ext4_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk)
 	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 	int ret;
 	bool allocated = false;
-	bool reserved = false;
 
 	/*
 	 * If the cluster containing lblk is shared with a delayed,
@@ -1646,21 +1645,19 @@ static int ext4_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk)
 	if (sbi->s_cluster_ratio == 1) {
 		ret = ext4_da_reserve_space(inode);
 		if (ret != 0)   /* ENOSPC */
-			goto errout;
-		reserved = true;
+			return ret;
 	} else {   /* bigalloc */
 		if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk)) {
 			if (!ext4_es_scan_clu(inode,
 					      &ext4_es_is_mapped, lblk)) {
 				ret = ext4_clu_mapped(inode,
 						      EXT4_B2C(sbi, lblk));
 				if (ret < 0)
-					goto errout;
+					return ret;
 				if (ret == 0) {
 					ret = ext4_da_reserve_space(inode);
 					if (ret != 0)   /* ENOSPC */
-						goto errout;
-					reserved = true;
+						return ret;
 				} else {
 					allocated = true;
 				}
@@ -1670,12 +1667,8 @@ static int ext4_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk)
 		}
 	}
 
-	ret = ext4_es_insert_delayed_block(inode, lblk, allocated);
-	if (ret && reserved)
-		ext4_da_release_space(inode, 1);
-
-errout:
-	return ret;
+	ext4_es_insert_delayed_block(inode, lblk, allocated);
+	return 0;
 }
 
 /*