linux-ext4 - [PATCH 1/3] ext4: Do not unnecessarily allocate buffer in recently

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Message-Id: <20170820115209.56957-1-wshilong@ddn.com>
Date:   Sun, 20 Aug 2017 19:52:09 +0800
From:   Wang Shilong <wangshilong1991@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>
Subject: [PATCH 1/3] ext4: Do not unnecessarily allocate buffer in recently_deleted()

From: Jan Kara <jack@...e.cz>

From: Jan Kara <jack@...e.cz>

In recently_deleted() function we want to check whether inode is still
cached in buffer cache. Use sb_find_get_block() for that instead of
sb_getblk() to avoid unnecessary allocation of bdev page and buffer
heads.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/ialloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 507bfb3..0d03e73 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -707,9 +707,9 @@ static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino)
 	if (unlikely(!gdp))
 		return 0;
 
-	bh = sb_getblk(sb, ext4_inode_table(sb, gdp) +
+	bh = sb_find_get_block(sb, ext4_inode_table(sb, gdp) +
 		       (ino / inodes_per_block));
-	if (unlikely(!bh) || !buffer_uptodate(bh))
+	if (!bh || !buffer_uptodate(bh))
 		/*
 		 * If the block is not in the buffer cache, then it
 		 * must have been written out.
-- 
2.9.3