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From fc9ed72f64b0e6689eaed1faa33e3a333b995bf7 Mon Sep 17 00:00:00 2001
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From: Kazuya Mio <k-mio@sx.jp.nec.com>
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Date: Sat, 17 Mar 2018 14:56:15 -0400
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Subject: [PATCH 05/16] libext2fs: fix ext2fs_open2() error for meta_bg image
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file
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commit 8b061a641dff1a0becf645f8e6002de79b997b95
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dumpe2fs/debugfs can examine the image file by using the -i option.
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However, if meta_bg feature is enabled, dumpe2fs/debugfs cannot open
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the image file.
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$ dumpe2fs -i test.img
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dumpe2fs: Attempt to read block from filesystem resulted in short read while trying to open test.img
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Couldn't find valid filesystem superblock.
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In case of specifying an image file, the location of block group descriptors
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is the same as the case of default filesystem regardless of meta_bg feature.
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So if EXT2_FLAG_IMAGE_FILE flag is set in ext2fs_open2(),
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don't use the meta_bg handling.
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Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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---
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lib/ext2fs/openfs.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
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index ba501e6a..200f7815 100644
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--- a/lib/ext2fs/openfs.c
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+++ b/lib/ext2fs/openfs.c
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@@ -378,7 +378,8 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
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#ifdef WORDS_BIGENDIAN
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groups_per_block = EXT2_DESC_PER_BLOCK(fs->super);
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#endif
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- if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
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+ if ((fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) &&
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+ !(flags & EXT2_FLAG_IMAGE_FILE)) {
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first_meta_bg = fs->super->s_first_meta_bg;
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if (first_meta_bg > fs->desc_blocks)
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first_meta_bg = fs->desc_blocks;
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--
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2.20.1
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