diff options
authorAlexander Fougner <>2016-02-24 11:52:34 +0100
committerDavid Sterba <>2016-03-14 13:42:47 +0100
commit2ae0b12df07d2d24720ba34e10994351e84a150f (patch)
parenteaa93e3b0295fc94c774ec73056559a6b8c78b42 (diff)
btrfs-progs: update docs for inspect-internal dump-super
Signed-off-by: Alexander Fougner <> [ minor formatting updates ] Signed-off-by: David Sterba <>
2 files changed, 37 insertions, 1 deletions
diff --git a/Documentation/btrfs-inspect-internal.asciidoc b/Documentation/btrfs-inspect-internal.asciidoc
index 73c834cb..bbbbc597 100644
--- a/Documentation/btrfs-inspect-internal.asciidoc
+++ b/Documentation/btrfs-inspect-internal.asciidoc
@@ -87,6 +87,42 @@ subvolume itself return it's own tree id (ie. subvol id)
NOTE: The result is undefined for the so-called empty subvolumes (identified by
inode number 2), but such subvolume does not contain any files anyway
+*show-super* [options] <device> [device...]::
+(needs root privileges)
+Show btrfs superblock information stored in devices.
+It is used to print the information of superblock,
+you can specify which mirror to print out.
+By default, every device's first superblock will be printed out.
+Mainly used for debug purpose.
+Print full superblock information.
+Including the system chunk array and backup roots.
+Print information of all superblocks.
+If this option is given, '-i' option will be ignored.
+-i <super_mirror>::::
+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.
+Attempt to print the superblock even if no superblock magic is found. May end
+-s <bytenr>::::
+specifiy offset to a superblock in a non-standard location at 'bytenr', useful
+for debugging (disables the '-f' option)
*subvolid-resolve* <subvolid> <path>::
(needs root privileges)
diff --git a/btrfs-completion b/btrfs-completion
index 76319111..db0dd978 100644
--- a/btrfs-completion
+++ b/btrfs-completion
@@ -36,7 +36,7 @@ _btrfs()
commands_device='scan add delete remove ready stats usage'
commands_scrub='start cancel resume status'
commands_rescue='chunk-recover super-recover'
- commands_inspect_internal='inode-resolve logical-resolve subvolid-resolve rootid min-dev-size dump-tree'
+ commands_inspect_internal='inode-resolve logical-resolve subvolid-resolve rootid min-dev-size dump-tree dump-super'
commands_property='get set list'
commands_quota='enable disable rescan'
commands_qgroup='assign remove create destroy show limit'