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Date:	Mon, 30 Jan 2012 00:01:03 +0800
From:	Yongqiang Yang <>
Cc:, Yongqiang Yang <>
Subject: [PATCH 1/4] ext4: do not copy gdt blocks for groups which do not have super when resizing

There is no need to copy gdt blocks for groups which do not have super
in resizing code, so this patch let resize code skip the groups.

Signed-off-by: Yongqiang Yang <>
 fs/ext4/resize.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 59fa0be..9a6fb74 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -449,6 +449,9 @@ static int setup_new_flex_group_blocks(struct super_block *sb,
 		gdblocks = ext4_bg_num_gdb(sb, group);
 		start = ext4_group_first_block_no(sb, group);
+		if (!ext4_bg_has_super(sb, group))
+			goto handle_itb;
 		/* Copy all of the GDT blocks into the backup in this group */
 		for (j = 0, block = start + 1; j < gdblocks; j++, block++) {
 			struct buffer_head *gdb;
@@ -491,6 +494,7 @@ static int setup_new_flex_group_blocks(struct super_block *sb,
 				goto out;
 		/* Initialize group tables of the grop @group */
 		if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
 			goto handle_bb;

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