diff options
| author | Eric Sandeen <sandeen@redhat.com> | 2014-05-13 21:03:04 -0500 |
|---|---|---|
| committer | David Sterba <dsterba@suse.cz> | 2014-08-22 14:39:31 +0200 |
| commit | fd518cfcb1fdb49ec4e5f09c397d16abb36178b8 (patch) | |
| tree | 49e4e65e42f14d1f49c98a53092a953c61d37220 /Documentation | |
| parent | da65695cc5f600c0f70efefd36c87d229e1ed3b4 (diff) | |
btrfs-show-super: don't try to print not-superblocks
If we point btrfs-show-super at a not-btrfs-device and
try to print all superblocks, bad things are apt to happen:
superblock: bytenr=274877906944, device=/dev/sdc2
---------------------------------------------------------
btrfs-show-super: ctree.h:1984: btrfs_super_csum_size: \
Assertion `!(t >= (sizeof(btrfs_csum_sizes) / sizeof((btrfs_csum_sizes)[0])))' failed.
csum 0xAborted
Don't try to print superblocks that don't look like superblocks,
and add an "-f" (force) option to try anyway, if the user
really wants to give it a shot.
Fix some spelling & capitalization while we're at it.
The manpage says that if any problem happens, 1 will
be returned, but that's already not true today LOL, so
I didn't bother to make it true when we detect bad
sb magic, either...
I figure it's worth continuing and trying all superblocks
in case just one has a corrupt magic.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
[renamed -f to -F due to clash with existing option, converted
relevant docs to asciidoc]
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/btrfs-show-super.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/btrfs-show-super.txt b/Documentation/btrfs-show-super.txt index e06157f5..62da6259 100644 --- a/Documentation/btrfs-show-super.txt +++ b/Documentation/btrfs-show-super.txt @@ -31,6 +31,10 @@ Specify which mirror to print out. <super_mirror> is between 0 and 2. If several '-i <super_mirror>' are given, only the last one is valid. +-F:: +Attempt to print the superblock even if no superblock magic is found. May end +badly. + EXIT STATUS ----------- *btrfs-show-super* will return 0 if no error happened. |