The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
btrfs-show – scan the /dev directory for btrfs partitions and print results. Synopsis btrfs-show Note btrfs-show is deprecated. Please consider to switch to the btrfs utility. Description btrfs-show is used to scan the /dev directory for btrfs partitions and display brief information such as lable, uuid, etc of each btrfs partition. Options none Availability btrfs-show…
btrfs-inspect-internal – query various internal information Synopsis btrfs inspect-internal <subcommand> <args> Description This command group provides an interface to query internal information. The functionality ranges from a simple UI to an ioctl or a more complex query that assembles the result from several internal structures. The latter usually requires calls to privileged ioctls. Subcommand dump-super…
btrfs-send – generate a stream of changes between two subvolume snapshots Synopsis btrfs send [-ve] [-p <parent>] [-c <clone-src>] [-f <outfile>] <subvol> [<subvol>…] Description This command will generate a stream of instructions that describe changes between two subvolume snapshots. The stream can be consumed by the btrfs receive command to replicate the sent snapshot on…
btrfs-select-super – overwrite primary superblock with a backup copy Synopsis btrfs-select-super -s number <device> Description Destructively overwrite all copies of the superblock with a specified copy. This helps in certain cases, for example when write barriers were disabled during a power failure and not all superblocks were written, or if the primary superblock is damaged,…
btrfs-scrub – scrub btrfs filesystem, verify block checksums Synopsis btrfs scrub <subcommand> <args> Description btrfs scrub is used to scrub a btrfs filesystem, which will read all data and metadata blocks from all devices and verify checksums. Automatically repair corrupted blocks if there’s a correct copy available. Note Scrub is not a filesystem checker (fsck)…
btrfs-restore – try to restore files from a damaged btrfs filesystem image Synopsis btrfs restore [options] <device> <path> | -l <device> Description btrfs restore is used to try to salvage files from a damaged filesystem and restore them into <path> or just list the subvolume tree roots. The filesystem image is not modified. If the…
btrfs-rescue – Recover a damaged btrfs filesystem Synopsis btrfs rescue <subcommand> <args> Description btrfs rescue is used to try to recover a damaged btrfs filesystem. Subcommand chunk-recover [options] <device> Recover the chunk tree by scanning the devices Options -y assume an answer of yes to all questions. -v verbose mode. -h help. Note Since chunk-recover…
btrfs-replace – replace devices managed by btrfs with other device. Synopsis btrfs replace <subcommand> <args> Description btrfs replace is used to replace btrfs managed devices with other device. Subcommand cancel <mount_point> Cancel a running device replace operation. start [-Bfr] <srcdev>|<devid> <targetdev> <path> Replace device of a btrfs filesystem. On a live filesystem, duplicate the data…
btrfs-receive – receive subvolumes from send stream Synopsis btrfs receive [options] <path> or btrfs receive –dump [options] Description Receive a stream of changes and replicate one or more subvolumes that were previously generated by btrfs send. The received subvolumes are stored to path, unless –dump option is given. If –dump option is specified, btrfs receive…
btrfs-quota – control the global quota status of a btrfs filesystem Synopsis btrfs quota <subcommand> <args> Description The commands under btrfs quota are used to affect the global status of quotas of a btrfs filesystem. The quota groups (qgroups) are managed by the subcommand btrfs qgroup(8). Note Qgroups are different than the traditional user quotas…
btrfs-qgroup – control the quota group of a btrfs filesystem Synopsis btrfs qgroup <subcommand> <args> Description btrfs qgroup is used to control quota group (qgroup) of a btrfs filesystem. Note To use qgroup you need to enable quota first using btrfs quota enable command. Warning Qgroup is not stable yet and will impact performance in…
btrfs-property – get/set/list properties for given filesystem object Synopsis btrfs property <subcommand> <args> Description btrfs property is used to get/set/list property for given filesystem object. The object can be an inode (file or directory), subvolume or the whole filesystem. See the description of get subcommand for more information about both btrfs object and property. btrfs…
btrfs-map-logical – map btrfs logical extent to physical extent Synopsis btrfs-map-logical <options> <device> Description btrfs-map-logical can be used to find out what the physical offsets are on the mirrors, the result is dumped to stdout by default. Mainly used for debug purpose. Options -l|–logical <logical_num> Logical extent to map. -c|–copy <copy> Copy of the extent…
btrfs-inspect-internal – query various internal information Synopsis btrfs inspect-internal <subcommand> <args> Description This command group provides an interface to query internal information. The functionality ranges from a simple UI to an ioctl or a more complex query that assembles the result from several internal structures. The latter usually requires calls to privileged ioctls. Subcommand dump-super…
btrfs-image – create/restore an image of the filesystem Synopsis btrfs-image [options] <source> <target> Description btrfs-image is used to create an image of a btrfs filesystem. All data will be zeroed, but metadata and the like is preserved. Mainly used for debugging purposes. In the dump mode, source is the btrfs device/file and target is the…
btrfs-find-root – filter to find btrfs root Synopsis btrfs-find-root [options] <device> Description btrfs-find-root is used to find the satisfied root, you can filter by root tree’s objectid, generation, level. Options -a Search through all metadata extents, even the root has been already found. -g <generation> Filter root tree by it’s original transaction id, tree root’s…
btrfs-filesystem – command group that primarily does work on the whole filesystems Synopsis btrfs filesystem <subcommand> <args> Description btrfs filesystem is used to perform several whole filesystem level tasks, including all the regular filesystem operations like resizing, space stats, label setting/getting, and defragmentation. There are other whole filesystem tasks like scrub or balance that are…
btrfs-device – manage devices of btrfs filesystems Synopsis btrfs device <subcommand> <args> Description The btrfs device command group is used to manage devices of the btrfs filesystems. Device Management Btrfs filesystem can be created on top of single or multiple block devices. Data and metadata are organized in allocation profiles with various redundancy policies. There’s…
btrfs-inspect-internal – query various internal information Synopsis btrfs inspect-internal <subcommand> <args> Description This command group provides an interface to query internal information. The functionality ranges from a simple UI to an ioctl or a more complex query that assembles the result from several internal structures. The latter usually requires calls to privileged ioctls. Subcommand dump-super…
btrfs-convert – convert from ext2/3/4 or reiserfs filesystem to btrfs in-place Synopsis btrfs-convert [options] <device> Description btrfs-convert is used to convert existing source filesystem image to a btrfs filesystem in-place. The original filesystem image is accessible in subvolume named like ext2_saved as file image. Supported filesystems: • ext2, ext3, ext4 — original feature, always built…