linux-ext4 - [PATCH] libext2fs: teach e2image imager to handle bigalloc file systems

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Message-Id: <20180319233300.23403-1-tytso@mit.edu>
Date:   Mon, 19 Mar 2018 19:33:00 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     k-mio@...jp.nec.com, Theodore Ts'o <tytso@....edu>
Subject: [PATCH] libext2fs: teach e2image imager to handle bigalloc file systems

Previously, "mke2fs -t ext4 -O bigalloc /tmp/foo.img 4G ;
e2image /tmp/foo.img /tmp/foo.e2i" would result in e2image
dumping core.  Fix ext2fs_image_bitmap_write() so it handles
file systems with bigalloc correctly.

Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 lib/ext2fs/imager.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/ext2fs/imager.c b/lib/ext2fs/imager.c
index 357443f23..efb85b947 100644
--- a/lib/ext2fs/imager.c
+++ b/lib/ext2fs/imager.c
@@ -309,8 +309,8 @@ errcode_t ext2fs_image_bitmap_write(ext2_filsys fs, int fd, int flags)
 		}
 		bmap = fs->block_map;
 		itr = fs->super->s_first_data_block;
-		cnt = EXT2_GROUPS_TO_BLOCKS(fs->super, fs->group_desc_count);
-		size = EXT2_BLOCKS_PER_GROUP(fs->super) / 8;
+		cnt = EXT2_GROUPS_TO_CLUSTERS(fs->super, fs->group_desc_count);
+		size = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
 	}
 	total_size = size * fs->group_desc_count;
 
-- 
2.16.1.72.g5be1f00a9a