mirror of
https://github.com/koverstreet/bcachefs-tools.git
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296 lines
7.9 KiB
Groff
296 lines
7.9 KiB
Groff
.Dd March 7, 2023
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.Dt BCACHEFS 8 SMM
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.Os
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.Sh NAME
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.Nm bcachefs
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.Nd manage bcachefs filesystems/devices
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.Sh SYNOPSIS
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.Nm
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.Ar command
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.Op Ar options
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.Op Ar arguments
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.Sh DESCRIPTION
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The
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.Nm
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utility supports the following subcommands,
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which are documented in detail below:
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.Ss Superblock commands
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.Bl -tag -width 18n -compact
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.It Ic format
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Format one or a list of devices with bcachefs data structures.
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.It Ic show-super
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Dump superblock information to stdout.
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.El
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.Ss Repair commands
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.Bl -tag -width 18n -compact
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.It Ic fsck
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Check an existing filesystem for errors.
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.El
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.Ss Commands for managing a running filesystem
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.Bl -tag -width 18n -compact
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.It Ic fs usage
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Show disk usage
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.El
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.Ss Commands for managing devices within a running filesystem
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.Bl -tag -width 18n -compact
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.It Ic device add
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Add a new device to an existing filesystem
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.It Ic device remove
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Remove a device from an existing filesystem
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.It Ic device online
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Re-add an existing member to a filesystem
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.It Ic device offline
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Take a device offline, without removing it
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.It Ic device evacuate
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Migrate data off of a specific device
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.It Ic device set-state
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Mark a device as failed
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.It Ic device resize
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Resize filesystem on a device
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.El
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.Ss Commands for managing filesystem data
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.Bl -tag -width 18n -compact
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.It Ic data rereplicate
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Rereplicate degraded data
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.El
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.Ss Commands for encryption
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.Bl -tag -width 18n -compact
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.It Ic unlock
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Unlock an encrypted filesystem prior to running/mounting
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.It Ic set-passphrase
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Change passphrase on an existing (unmounted) filesystem
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.It Ic remove-passphrase
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Remove passphrase on an existing (unmounted) filesystem
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.El
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.Ss Commands for migration
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.Bl -tag -width 18n -compact
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.It Ic migrate
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Migrate an existing filesystem to bcachefs, in place
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.It Ic migrate-superblock
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Add default superblock, after bcachefs migrate
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.El
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.Ss Commands for debugging
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.Bl -tag -width 18n -compact
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.It Ic dump
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Dump filesystem metadata to a qcow2 image
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.It Ic list
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List filesystem metadata in textual form
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.El
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.Ss Miscellaneous commands
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.Bl -tag -width 18n -compact
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.It Ic version
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Display the version of the invoked bcachefs tool
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.El
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.Sh Superblock commands
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.Bl -tag -width Ds
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.It Nm Ic format Oo Ar options Oc Ar devices\ ...
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Format one or a list of devices with bcachefs data structures.
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You need to do this before you create a volume.
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.Pp
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Device specific options must come before corresponding devices, e.g.
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.Dl bcachefs format --label=ssd /dev/sda --label=hdd /dev/sdb
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.Bl -tag -width Ds
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.It Fl b , Fl -block Ns = Ns Ar size
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block size, in bytes (e.g. 4k)
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.It Fl -btree_node Ns = Ns Ar size
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Btree node size, default 256k
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.It Fl -metadata_checksum_type Ns = Ns ( Cm none | crc32c | crc64 )
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Set metadata checksum type (default:
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.Cm crc32c ) .
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.It Fl -data_checksum_type Ns = Ns ( Cm none | crc32c | crc64 )
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Set data checksum type (default:
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.Cm crc32c ) .
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.It Fl -compression Ns = Ns ( Cm none | lz4 | gzip | zstd )
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Set compression type (default:
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.Cm none ) .
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.It Fl -data_replicas Ns = Ns Ar number
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Number of data replicas
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.It Fl -metadata_replicas Ns = Ns Ar number
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Number of metadata replicas
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.It Fl -replicas Ns = Ns Ar number
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Sets both data and metadata replicas
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.It Fl -encrypted
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Enable whole filesystem encryption (chacha20/poly1305);
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passphrase will be prompted for.
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.It Fl -no_passphrase
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Don't encrypt master encryption key
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.It Fl -error_action Ns = Ns ( Cm continue | remount-ro | panic )
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Action to take on filesystem error (default:
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.Cm remount-ro )
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.It Fl L , Fl -label Ns = Ns Ar label
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Create the filesystem with the specified
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.Ar label
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.It Fl U , -uuid Ns = Ns Ar uuid
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Create the filesystem with the specified
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.Ar uuid
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.It Fl f , Fl -force
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Force the filesystem to be created,
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even if the device already contains a filesystem.
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.El
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.Pp
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Device specific options:
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.Bl -tag -width Ds
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.It Fl -fs_size Ns = Ns Ar size
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Create the filesystem using
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.Ar size
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bytes on the subsequent device.
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.It Fl -bucket Ns = Ns Ar size
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Specifies the bucket size;
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must be greater than the btree node size
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.It Fl -discard
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Enable discards on subsequent devices
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.It Fl q , Fl -quiet
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Only print errors
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.El
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.It Nm Ic show-super Oo Ar options Oc Ar device
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Dump superblock information to stdout.
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.Bl -tag -width Ds
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.It Fl f , Fl -fields Ns = Ns Ar fields
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List of sections to print
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.It Fl l , Fl -layout
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Print superblock layout
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.El
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.El
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.Sh Repair commands
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.Bl -tag -width Ds
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.It Nm Ic fsck Oo Ar options Oc Ar devices\ ...
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Check an existing filesystem for errors.
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.Bl -tag -width Ds
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.It Fl p
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Automatic repair (no questions)
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.It Fl n
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Don't repair, only check for errors
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.It Fl y
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Assume "yes" to all questions
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.It Fl f
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Force checking even if filesystem is marked clean
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.It Fl v
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Be verbose
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.El
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.El
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.Sh Commands for managing a running filesystem
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.Bl -tag -width Ds
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.It Nm Ic fs Ic usage Oo Ar options Oc Op Ar filesystem
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Show disk usage.
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.Bl -tag -width Ds
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.It Fl h
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Print human readable sizes.
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.El
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.El
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.Sh Commands for managing devices within a running filesystem
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.Bl -tag -width Ds
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.It Nm Ic device Ic add Oo Ar options Oc Ar device
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Add a device to an existing filesystem.
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.Bl -tag -width Ds
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.It Fl -fs_size Ns = Ns Ar size
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Size of filesystem on device
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.It Fl -bucket Ns = Ns Ar size
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Set bucket size
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.It Fl -discard
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Enable discards
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.It Fl f , Fl -force
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Use device even if it appears to already be formatted
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.El
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.It Nm Ic device Ic remove Oo Ar options Oc Ar device
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Remove a device from a filesystem
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.Bl -tag -width Ds
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.It Fl f , Fl -force
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Force removal, even if some data couldn't be migrated
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.It Fl -force-metadata
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Force removal, even if some metadata couldn't be migrated
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.El
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.It Nm Ic device Ic online Ar device
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Re-add a device to a running filesystem
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.It Nm Ic device Ic offline Ar device
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Take a device offline, without removing it
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.Bl -tag -width Ds
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.It Fl f , Fl -force
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Force, if data redundancy will be degraded
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.El
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.It Nm Ic device Ic evacuate Ar device
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Move data off of a given device
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.It Nm Ic device Ic set-state Oo Ar options Oc Ar new-state Ar device
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.Bl -tag -width Ds
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.It Ar new-state Ns = Ns ( Ar rw | ro | failed | spare )
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.It Fl f , Fl -force
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Force, if data redundancy will be degraded
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.El
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.It Nm Ic device Ic resize Ar device Op Ar size
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Resize filesystem on a device
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.El
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.Sh Commands for managing filesystem data
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.Bl -tag -width Ds
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.It Nm Ic device Ic rereplicate Ar filesystem
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Walks existing data in a filesystem,
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writing additional copies of any degraded data.
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.El
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.Sh Commands for encryption
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.Bl -tag -width Ds
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.It Nm Ic unlock Ar device
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Unlock an encrypted filesystem prior to running/mounting.
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.It Nm Ic set-passphrase Ar devices\ ...
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Change passphrase on an existing (unmounted) filesystem.
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.It Nm Ic remove-passphrase Ar devices\ ...
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Remove passphrase on an existing (unmounted) filesystem.
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.El
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.Sh Commands for migration
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.Bl -tag -width Ds
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.It Nm Ic migrate Oo Ar options Oc Ar device
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Migrate an existing filesystem to bcachefs
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.Bl -tag -width Ds
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.It Fl f Ar fs
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Root of filesystem to migrate
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.It Fl -encrypted
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Enable whole filesystem encryption (chacha20/poly1305)
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.It Fl -no_passphrase
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Don't encrypt master encryption key
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.It Fl F
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Force, even if metadata file already exists
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.El
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.It Nm Ic migrate-superblock Oo Ar options Oc Ar device
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Create default superblock after migrating
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.Bl -tag -width Ds
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.It Fl d Ar device
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Device to create superblock for
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.It Fl o Ar offset
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Offset of existing superblock
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.El
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.El
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.Sh Commands for debugging
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These commands work on offline, unmounted filesystems.
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.Bl -tag -width Ds
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.It Nm Ic dump Oo Ar options Oc Ar device
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Dump filesystem metadata
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.Bl -tag -width Ds
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.It Fl o Ar output
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Required flag: Output qcow2 image(s)
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.It Fl f
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Force; overwrite when needed
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.El
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.It Nm Ic list Oo Ar options Oc Ar devices\ ...
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List filesystem metadata to stdout
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.Bl -tag -width Ds
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.It Fl b ( Cm extents | inodes | dirents | xattrs )
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Btree to list from
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.It Fl s Ar inode Ns Cm \&: Ns Ar offset
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Start position to list from
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.It Fl e Ar inode Ns Cm \&: Ns Ar offset
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End position
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.It Fl i Ar inode
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List keys for a given inode number
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.It Fl m ( Cm keys | formats )
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.It Fl f
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Force fsck
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.It Fl v
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Verbose mode
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List mode
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.El
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.El
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.Sh Miscellaneous commands
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.Bl -tag -width Ds
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.It Nm Ic version
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Display the version of the invoked bcachefs tool
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.El
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.Sh EXIT STATUS
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.Ex -std
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