linux-ext4 - [PATCH] ext2: start from parent blockgroup when trying linear search for a free inode

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Date:   Sat,  1 Jun 2019 16:49:41 +0800
From:   Chengguang Xu <cgxu519@...o.com.cn>
To:     jack@...e.com
Cc:     linux-ext4@...r.kernel.org, Chengguang Xu <cgxu519@...o.com.cn>
Subject: [PATCH] ext2: start from parent blockgroup when trying linear search for a free inode

Start from parent blockgroup when trying linear search
for a free indoe because for non directory inode it's
better to keep in same blockgroup with parent.

Signed-off-by: Chengguang Xu <cgxu519@...o.com.cn>
---
 fs/ext2/ialloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index fda7d3f5b4be..435463a255e6 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -411,11 +411,11 @@ static int find_group_other(struct super_block *sb, struct inode *parent)
 	 */
 	group = parent_group;
 	for (i = 0; i < ngroups; i++) {
-		if (++group >= ngroups)
-			group = 0;
 		desc = ext2_get_group_desc (sb, group, NULL);
 		if (desc && le16_to_cpu(desc->bg_free_inodes_count))
 			goto found;
+		if (++group >= ngroups)
+			group = 0;
 	}
 
 	return -1;
-- 
2.17.2