linux-kernel - [PATCH 11/13] ext4: correct gdblock calculation in add_new_gdb_meta

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Message-Id: <20230629120044.1261968-12-shikemeng@huaweicloud.com>
Date:   Thu, 29 Jun 2023 20:00:42 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     tytso@....edu, adilger.kernel@...ger.ca
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 11/13] ext4: correct gdblock calculation in add_new_gdb_meta_bg to support non first group

In add_new_gdb_meta_bg, we assume that group could be non first
group in meta block group as we call ext4_meta_bg_first_block_no
to get first block of meta block group rather than call
ext4_group_first_block_no for passed group directly. Then ext4_bg_has_super
should be called with first group in meta group rather than new added
group. Or we can call ext4_group_first_block_no instead of
ext4_meta_bg_first_block_no to assume only first group of
meta group will be passed.
Either way, ext4_meta_bg_first_block_no will be useless and
could be removed.

This patch do it in first way to make add_new_gdb_meta_bg support non
first group in meta block group.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 fs/ext4/resize.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index b9507e432496..da832466ce74 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -110,12 +110,6 @@ static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
 	       EXT4_DESC_PER_BLOCK_BITS(sb);
 }
 
-static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
-					     ext4_group_t group) {
-	group = ext4_meta_bg_first_group(sb, group);
-	return ext4_group_first_block_no(sb, group);
-}
-
 static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
 						ext4_group_t group) {
 	ext4_grpblk_t overhead;
@@ -954,8 +948,9 @@ static int add_new_gdb_meta_bg(struct super_block *sb,
 	unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
 	int err;
 
-	gdblock = ext4_meta_bg_first_block_no(sb, group) +
-		   ext4_bg_has_super(sb, group);
+	group = ext4_meta_bg_first_group(sb, group);
+	gdblock = ext4_group_first_block_no(sb, group) +
+		  ext4_bg_has_super(sb, group);
 	gdb_bh = ext4_sb_bread(sb, gdblock, 0);
 	if (IS_ERR(gdb_bh))
 		return PTR_ERR(gdb_bh);
-- 
2.30.0