NEWFS_EXT2FS(8) | System Manager's Manual | NEWFS_EXT2FS(8) |
newfs_ext2fs
—
newfs_ext2fs |
[-FINZ ] [-b
block-size] [-D
inodesize] [-f
frag-size] [-i
bytes-per-inode] [-m
free-space] [-n
inodes] [-O
filesystem-format] [-S
sector-size] [-s
size] [-V
verbose] [-v
volname] special |
newfs_ext2fs
is used to initialize and clear ext2 file
systems before first use. Before running newfs_ext2fs
the disk must be labeled using
disklabel(8).
newfs_ext2fs
builds a file system on the specified
special device basing its defaults on the information in the disk label.
Typically the defaults are reasonable, however
newfs_ext2fs
has numerous options to allow the
defaults to be selectively overridden.
Options with numeric arguments may contain an optional (case-insensitive) suffix:
The following options define the general layout policies.
-b
block-size-D
inodesize-F
-s
size”. No attempts to use or update the disk
label will be made.-f
frag-size-I
Linux Ext2
’.-i
bytes-per-inode-m
free-space-N
-n
inodes-i
and -n
are specified
then -n
takes precedence. The default number of
inodes is calculated from a number of blocks in the file system.-O
filesystem-formatGOOD_OLD_REV
’; this option is
primarily used to build root file systems that can be understood by
old or dumb firmwares for bootstrap.DYNAMIC_REV
’; the default.
Various extended (and sometimes incompatible) features are enabled
(though not all features are supported on
NetBSD). Currently only the following features
are supported:
-s
size-S
secsize) after suffix
interpretation.
If no -s
size is
specified then the filesystem size defaults to that of the partition,
or, if -F
is specified, the existing file.
If size is negative the specified size is subtracted from the default size (reserving space at the end of the partition).
-V
verbose-N
is specified
newfs_ext2fs
stops before outputting the progress
bar.-v
volname-Z
-F
.The following option overrides the standard sizes for the disk
geometry. The default value is taken from the disk label. Changing this
default is useful only when using newfs_ext2fs
to
build a file system whose raw image will eventually be used on a different
type of disk than the one on which it is initially created (for example on a
write-once disk). Note that changing this value from its default will make
it impossible for
fsck_ext2fs(8) to find
the alternative superblocks if the standard superblock is lost.
-S
sector-sizeThe file system is created with ‘random’ inode generation numbers to improve NFS security.
The owner and group IDs of the root node and reserved blocks of the new file system are set to the effective UID and GID of the user initializing the file system.
For the newfs_ext2fs
command to succeed,
the disk label should first be updated such that the fstype field for the
partition is set to
‘Linux Ext2
’, unless
-F
or -I
is used.
The partition size is found using fstat(2), not by inspecting the disk label. The block size and fragment size will be written back to the disk label only if the last character of special references the same partition as the minor device number.
Remy Card, Theodore Ts'o, and Stephen Tweedie, Design and Implementation of the Second Extended Filesystem, The Proceedings of the First Dutch International Symposium on Linux, http://e2fsprogs.sourceforge.net/ext2intro.html.
newfs_ext2fs
command first appeared in
NetBSD 5.0.
newfs_ext2fs
command was written by
Izumi Tsutsui ⟨tsutsui@NetBSD.org⟩.
newfs_ext2fs
command is still experimental and there
are few sanity checks.
The newfs_ext2fs
command doesn't have
options to specify each REV1 file system feature independently.
The newfs_ext2fs
command doesn't support
the bad block list accounted by the bad blocks inode.
Many newer ext2 file system features (especially journaling) are not supported yet.
Some features in file systems created by the
newfs_ext2fs
command might not be recognized
properly by the
fsck_ext2fs(8)
utility.
There is no native tool in the NetBSD distribution for resizing ext2 file systems yet.
April 13, 2019 | NetBSD 9.4 |