path: root/Documentation/btrfs-check.asciidoc
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authorNicholas D Steeves <>2016-04-23 00:41:30 +0100
committerNicholas D Steeves <>2016-04-23 00:41:30 +0100
commitcec572daccafa1e912cbed363df6f84687778c6f (patch)
tree7d99ab9f73d25c1ed8eaf6393f6374edf5316b03 /Documentation/btrfs-check.asciidoc
btrfs-progs (4.4.1-1.1) unstable; urgency=medium
* Non-maintainer upload. * New upstream release. * Rename package to btrfs-progs (Closes: #780081) * Update standards version to 3.9.7 (no changes needed). * debian/control: Add "Breaks" per Gianfranco Costamagna's suggestion * Change lintian override to reflect package rename * Switch from using postinst and postrm to using triggers per Christian Seiler's recommendation. # imported from the archive
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+btrfs-check - check or repair an unmounted btrfs filesystem
+*btrfs check* [options] <device>
+*btrfs check* is used to check or repair an unmounted btrfs filesystem.
+NOTE: Since btrfs is under development, the *btrfs check* capabilities are
+continuously enhanced. It's highly recommended to read the following btrfs
+wiki before executing *btrfs check* with '--repair' option: +
+*btrfsck* is an alias of *btrfs check* command and is now deprecated.
+-s|--super <superblock>::
+use <superblock>th superblock copy, valid values are 0 up to 2 if the
+respective superblock offset is within the filesystem
+try to repair the filesystem
+create a new CRC tree and recalculate all checksums
+create a new extent tree
+verify checksums of data blocks
+indicate progress at various checking phases
+verify qgroup accounting and compare against filesystem accounting
+--subvol-extents <subvolid>::
+show extent state for a subvolume
+--tree-root <bytenr>::
+use the given bytenr for the tree root
+*btrfs check* returns a zero exit status if it succeeds. Non zero is
+returned in case of failure.
+*btrfs* is part of btrfs-progs.
+Please refer to the btrfs wiki for
+further details.