linux-ext4 - [PATCH 26/47] resize2fs: use old_fs to detect per-bg metadata blocks to free

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Message-ID: <20141107215335.883.83617.stgit@birch.djwong.org>
Date:	Fri, 07 Nov 2014 13:53:35 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 26/47] resize2fs: use old_fs to detect per-bg metadata
 blocks to free

When shrinking a filesystem, resize2fs wants to free per-bg metadata
blocks that are no longer needed.  This behavior is gated on whether
there's a superblock in the group as told by new_fs.  The check really
should be against old_fs, since we're effectively freeing blocks out
of old_fs in the transition to new_fs, but prior to sparse_super2 this
didn't matter since superblocks didn't move, so it didn't matter.

Under sparse_super2, however, there's a superblock in the last group,
so now we need to change the test to use old_fs as it should.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 resize/resize2fs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index 1415244..da1ec9c 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -1042,7 +1042,7 @@ static errcode_t blocks_to_move(ext2_resize_t rfs)
 		}

 		for (i = 0; i < max_groups; i++) {
-			if (!ext2fs_bg_has_super(fs, i)) {
+			if (!ext2fs_bg_has_super(old_fs, i)) {
 				group_blk += fs->super->s_blocks_per_group;
 				continue;
 			}

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