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author | Qu Wenruo <quwenruo@cn.fujitsu.com> | 2015-08-25 10:44:57 +0800 |
---|---|---|
committer | David Sterba <dsterba@suse.com> | 2015-08-31 19:25:13 +0200 |
commit | 004eabb1ad09171389b7e9260342758e7b331a07 (patch) | |
tree | 3c6ffdc6392ecb98ccbc1d2e76d85e1a9ab29f7e /volumes.h | |
parent | 3eb8836424fd363fd7b4dda5cc602ed0040c3f8a (diff) |
btrfs-progs: find-root: fix a bug that will cause wrong result
[BUG]
btrfs-find-root may not output desire result, as due to
search_extent_cache() may return a result that doesn't cover the desired
range, generation cache can be screwed up if higher generation tree root
is found before lower generation tree root.
For example:
=======
./btrfs-find-root /dev/sda6 -a
Superblock thinks the generation is 8
Superblock thinks the level is 0
adding bytenr: 4194304, gen: 8 <<< Debug output
adding bytenr: 24715264, gen: 7 <<< gen is 7 at read_tree_block time
Well block 4194304(gen: 8 level: 0) seems good, and it matches
superblock
Well block 24715264(gen: 8 level: 0) seems good, and it matches
superblock <<< But its gen is wrong at result output time
=======
[Fix]
Add a new check to make sure the search_extent_cache() is returning the
desired result.
Reported-by: Marc Merlin <marc@merlins.org>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'volumes.h')
0 files changed, 0 insertions, 0 deletions