mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-16 19:35:38 +00:00
5b1c5b8878
Previously in 'filesystem resize get_min_size', now 'inspect-internal min-dev-size'. We'd like to avoid cluttering the 'resize' syntax further. The test has been updated to exercise the new option. Signed-off-by: David Sterba <dsterba@suse.com>
200 lines
6.6 KiB
Plaintext
200 lines
6.6 KiB
Plaintext
btrfs-filesystem(8)
|
|
===================
|
|
|
|
NAME
|
|
----
|
|
btrfs-filesystem - control btrfs filesystem
|
|
|
|
SYNOPSIS
|
|
--------
|
|
*btrfs filesystem* <subcommand> <args>
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
*btrfs filesystem* is used to do the filesystem level control jobs, including
|
|
all the regular filesystem operations like setting/getting label,
|
|
resizing, defragment.
|
|
|
|
SUBCOMMAND
|
|
----------
|
|
*df* [options] <path>::
|
|
Show space usage information for a mount point.
|
|
+
|
|
`Options`
|
|
+
|
|
-b|--raw::::
|
|
raw numbers in bytes, without the 'B' suffix
|
|
-h|--human-readable::::
|
|
print human friendly numbers, base 1024, this is the default
|
|
-H::::
|
|
print human friendly numbers, base 1000
|
|
--iec::::
|
|
select the 1024 base for the following options, according to the IEC standard
|
|
--si::::
|
|
select the 1000 base for the following options, according to the SI standard
|
|
-k|--kbytes::::
|
|
show sizes in KiB, or kB with --si
|
|
-m|--mbytes::::
|
|
show sizes in MiB, or MB with --si
|
|
-g|--gbytes::::
|
|
show sizes in GiB, or GB with --si
|
|
-t|--tbytes::::
|
|
show sizes in TiB, or TB with --si
|
|
+
|
|
If conflicting options are passed, the last one takes precedence.
|
|
|
|
*defragment* [options] <file>|<dir> [<file>|<dir>...]::
|
|
Defragment file data and/or directory metadata *online*.
|
|
+
|
|
If '-r' is passed, files in dir will be defragmented recursively.
|
|
The start position and the number of bytes to defragment can be specified by
|
|
start and len using '-s' and '-l' options below.
|
|
Extents bigger than value given by '-t' will be skipped, otherwise this value
|
|
is used as a target extent size, but is only advisory and may not be reached
|
|
if the free space is too fragmented.
|
|
Use 0 to take the kernel default, which is 256kB but may change in the future.
|
|
You can also turn on compression in defragment operations.
|
|
+
|
|
`Options`
|
|
+
|
|
-v::::
|
|
be verbose
|
|
-c[<algo>]::::
|
|
compress file contents while defragmenting. Optional argument selects the compression
|
|
algorithm, 'zlib' (default) or 'lzo'. Currently it's not possible to select no
|
|
compression.
|
|
-r::::
|
|
defragment files recursively in given directories
|
|
-f::::
|
|
flush data for each file before going to the next file. This will limit the amount
|
|
of dirty data to current file, otherwise the amount cumulates from several files
|
|
and may increase system load.
|
|
-s <start>[kKmMgGtTpPeE]::::
|
|
defragment only from byte <start> onward
|
|
-l <len>[kKmMgGtTpPeE]::::
|
|
defragment only up to <len> bytes
|
|
-t <size>[kKmMgGtTpPeE]::::
|
|
target extent size, do not touch extents bigger than <size>
|
|
+
|
|
For <start>, <len>, <size> it is possible to append
|
|
units designator: \'K', \'M', \'G', \'T', \'P', or \'E', which represent
|
|
KiB, MiB, GiB, TiB, PiB, or EiB, respectively. Case does not matter.
|
|
+
|
|
WARNING: defragmenting with kernels up to 2.6.37 will unlink COW-ed copies of data,
|
|
don't use it if you use snapshots, have de-duplicated your data or made
|
|
copies with `cp --reflink`.
|
|
|
|
*label* [<dev>|<mountpoint>] [<newlabel>]::
|
|
Show or update the label of a filesystem.
|
|
+
|
|
[<device>|<mountpoint>] is used to identify the filesystem.
|
|
If a newlabel optional argument is passed, the label is changed.
|
|
+
|
|
NOTE: the maximum allowable length shall be less than 256 chars
|
|
|
|
// Some wording are extracted by the resize2fs man page
|
|
*resize* [<devid>:][+/-]<size>[kKmMgGtTpPeE]|[<devid>:]max <path>::
|
|
Resize a mounted filesystem identified by directory <path>. A particular device
|
|
can be resized by specifying a <devid>.
|
|
+
|
|
If <path> is a file containing a btrfs image then resize does not work as
|
|
expected and does not resize the image. This would resize the underlying
|
|
filesystem instead.
|
|
+
|
|
The devid can be found with *btrfs filesystem show* and
|
|
defaults to 1 if not specified.
|
|
The <size> parameter specifies the new size of the filesystem.
|
|
If the prefix + or - is present the size is increased or decreased
|
|
by the quantity <size>.
|
|
If no units are specified, the unit of the <size> parameter defaults to
|
|
bytes. Optionally, the size parameter may be suffixed by one of the following
|
|
units designators: \'K', \'M', \'G', \'T', \'P', or \'E', which represent
|
|
KiB, MiB, GiB, TiB, PiB, or EiB, respectively. Case does not matter.
|
|
+
|
|
If \'max' is passed, the filesystem will occupy all available space on the
|
|
device devid.
|
|
+
|
|
The resize command does not manipulate the size of underlying
|
|
partition. If you wish to enlarge/reduce a filesystem, you must make sure you
|
|
can expand the partition before enlarging the filesystem and shrink the
|
|
partition after reducing the size of the filesystem. This can done using
|
|
`fdisk`(8) or `parted`(8) to delete the existing partition and recreate
|
|
it with the new desired size. When recreating the partition make sure to use
|
|
the same starting disk cylinder as before.
|
|
|
|
*show* [options] [<path>|<uuid>|<device>|<label>]::
|
|
Show the btrfs filesystem with some additional info.
|
|
+
|
|
If no option nor <path>|<uuid>|<device>|<label> is passed, btrfs shows
|
|
information of all the btrfs filesystem both mounted and unmounted.
|
|
+
|
|
`Options`
|
|
+
|
|
-m|--mounted::::
|
|
probe btrfs kernel to list mounted btrfs filesystems(s)
|
|
-d|--all-devices::::
|
|
scan all devices under /dev, otherwise the devices list is extracted from the
|
|
/proc/partitions file.
|
|
--raw::::
|
|
raw numbers in bytes, without the 'B' suffix
|
|
--human-readable::::
|
|
print human friendly numbers, base 1024, this is the default
|
|
--iec::::
|
|
select the 1024 base for the following options, according to the IEC standard
|
|
--si::::
|
|
select the 1000 base for the following options, according to the SI standard
|
|
--kbytes::::
|
|
show sizes in KiB, or kB with --si
|
|
--mbytes::::
|
|
show sizes in MiB, or MB with --si
|
|
--gbytes::::
|
|
show sizes in GiB, or GB with --si
|
|
--tbytes::::
|
|
show sizes in TiB, or TB with --si
|
|
|
|
*sync* <path>::
|
|
Force a sync for the filesystem identified by <path>.
|
|
|
|
*usage* [options] <path> [<path>...]::
|
|
Show detailed information about internal filesystem usage.
|
|
+
|
|
`Options`
|
|
+
|
|
-b|--raw::::
|
|
raw numbers in bytes, without the 'B' suffix
|
|
-h|--human-readable::::
|
|
print human friendly numbers, base 1024, this is the default
|
|
-H::::
|
|
print human friendly numbers, base 1000
|
|
--iec::::
|
|
select the 1024 base for the following options, according to the IEC standard
|
|
--si::::
|
|
select the 1000 base for the following options, according to the SI standard
|
|
-k|--kbytes::::
|
|
show sizes in KiB, or kB with --si
|
|
-m|--mbytes::::
|
|
show sizes in MiB, or MB with --si
|
|
-g|--gbytes::::
|
|
show sizes in GiB, or GB with --si
|
|
-t|--tbytes::::
|
|
show sizes in TiB, or TB with --si
|
|
-T::::
|
|
show data in tabular format
|
|
+
|
|
If conflicting options are passed, the last one takes precedence.
|
|
|
|
EXIT STATUS
|
|
-----------
|
|
*btrfs filesystem* returns a zero exit status if it succeeds. Non zero is
|
|
returned in case of failure.
|
|
|
|
AVAILABILITY
|
|
------------
|
|
*btrfs* is part of btrfs-progs.
|
|
Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
|
|
further details.
|
|
|
|
SEE ALSO
|
|
--------
|
|
`mkfs.btrfs`(8),
|