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ext4: avoid duplicate writes of the backup bg descriptor blocks

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commit 2ebd1704de upstream.

The resize code was needlessly writing the backup block group
descriptor blocks multiple times (once per block group) during an
online resize.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yongqiang Yang 2012-09-05 01:27:50 -04:00 committed by Greg Kroah-Hartman
parent 1079d76f47
commit 2de1ece4de
1 changed files with 6 additions and 4 deletions
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10
fs/ext4/resize.c
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@ -1302,13 +1302,15 @@ static int ext4_flex_group_add(struct super_block *sb,
err = err2;
if (!err) {
int i;
int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
int gdb_num_end = ((group + flex_gd->count - 1) /
EXT4_DESC_PER_BLOCK(sb));
update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
sizeof(struct ext4_super_block));
for (i = 0; i < flex_gd->count; i++, group++) {
for (; gdb_num <= gdb_num_end; gdb_num++) {
struct buffer_head *gdb_bh;
int gdb_num;
gdb_num = group / EXT4_BLOCKS_PER_GROUP(sb);
gdb_bh = sbi->s_group_desc[gdb_num];
update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
gdb_bh->b_size);