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Diffstat (limited to 'sbin/newfs_ext2fs')
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diff --git a/sbin/newfs_ext2fs/newfs_ext2fs.8 b/sbin/newfs_ext2fs/newfs_ext2fs.8 new file mode 100644 index 00000000000..3f84c65cfb7 --- /dev/null +++ b/sbin/newfs_ext2fs/newfs_ext2fs.8 @@ -0,0 +1,335 @@ +.\" $OpenBSD: newfs_ext2fs.8,v 1.1 2010/02/16 08:28:11 otto Exp $ +.\" $NetBSD: newfs_ext2fs.8,v 1.7 2009/12/01 08:47:25 pooka Exp $ +.\" +.\" Copyright (c) 1983, 1987, 1991, 1993, 1994 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)newfs.8 8.6 (Berkeley) 5/3/95 +.\" +.Dd $Mdocdate: February 16 2010 $ +.Dt NEWFS_EXT2FS 8 +.Os +.Sh NAME +.Nm newfs_ext2fs +.Nd construct a new Ext2 file system +.Sh SYNOPSIS +.Nm +.Bk -words +.Op Fl FINZ +.Op Fl b Ar block-size +.Op Fl D Ar inodesize +.Op Fl f Ar frag-size +.Op Fl i Ar bytes-per-inode +.Op Fl m Ar free-space +.Op Fl n Ar inodes +.Op Fl O Ar filesystem-format +.Op Fl S Ar sector-size +.Op Fl s Ar size +.Op Fl V Ar verbose +.Op Fl v Ar volname +.Ar special +.Ek +.Sh DESCRIPTION +.Nm +is used to initialize and clear Ext2 file systems before first use. +Before running +.Nm +the disk must be labeled using +.Xr disklabel 8 . +.Nm +builds a file system on the specified +.Ar special +device, +basing its defaults on the information in the disk label. +Typically the defaults are reasonable, although +.Nm +has numerous options to allow the defaults to be selectively overridden. +.Pp +The +.Ar special +file should be a raw device, +for example +.Pa /dev/rsd0a ; +if a relative path like +.Pa sd0a +is specified, +the corresponding raw device is used. +.Pp +Options with numeric arguments may contain an optional (case-insensitive) +suffix: +.Bl -tag -width 3n -offset indent -compact +.It b +Bytes; causes no modification. +(Default) +.It k +Kilo; multiply the argument by 1024 +.It m +Mega; multiply the argument by 1048576 +.It g +Giga; multiply the argument by 1073741824 +.El +.Pp +The following options define the general layout policies. +.Bl -tag -width Fl +.It Fl b Ar block-size +The block size of the file system, in bytes. +It must be a power of two. +The smallest allowable size is 1024 bytes. +The default size depends upon the size of the file system: +.Pp +.Bl -tag -width "file system size" -compact -offset indent +.It Sy "file system size" +.Ar block-size +.It \*[Lt]= 512 MB +1 KB +.It \*[Gt] 512 MB +4 KB +.El +.It Fl D +Set the inode size. +Defaults to 128, and can also be set to 256 for +compatibility with ext4. +.It Fl F +Create a file system image in +.Ar special . +The file system size needs to be specified with +.Dq Fl s Ar size . +No attempts to use or update the disk label will be made. +.It Fl f Ar frag-size +The fragment size of the file system in bytes. +It must be the same with blocksize because current ext2fs +implementation doesn't support fragmentation. +.It Fl I +Do not require that the file system type listed in the disk label is +.Ql Linux Ext2 . +.It Fl i Ar bytes-per-inode +This specifies the density of inodes in the file system. +If fewer inodes are desired, a larger number should be used; +to create more inodes a smaller number should be given. +.It Fl m Ar free-space +The percentage of space reserved from normal users; the minimum free +space threshold. +The default value used is 5%. +.It Fl N +Causes the file system parameters to be printed out +without really creating the file system. +.It Fl n Ar inodes +This specifies the number of inodes for the file system. +If both +.Fl i +and +.Fl n +are specified then +.Fl n +takes precedence. +The default number of inodes is calculated from a number of blocks in +the file system. +.It Fl O Ar filesystem-format +Select the filesystem-format +.Bl -tag -width 3n -offset indent -compact +.It 0 +.Ql GOOD_OLD_REV ; +This option is primarily used to build root file systems that can be +understood by old or dumb firmwares for bootstrap. +(default) +.It 1 +.Ql DYNAMIC_REV ; +Various extended (and sometimes incompatible) features are enabled +(though not all features are supported on +.Ox ) . +Currently only the following features are supported: +.Bl -tag -width "SPARSESUPER" -offset indent -compact +.It RESIZE +Prepare some reserved structures which enable future file system resizing. +.It FTYPE +Store file types in directory entries to improve performance. +.It SPARSESUPER +Prepare superblock backups for the +.Xr fsck_ext2fs 8 +utility on not all but sparse block groups. +.It LARGEFILE +Enable files larger than 2G bytes. +.El +.El +.It Fl s Ar size +The size of the file system in sectors. +An +.Sq s +suffix will be interpreted as the number of sectors (the default). +All other suffixes are interpreted as per other numeric arguments, +except that the number is converted into sectors by dividing by the +sector size (as specified by +.Fl S Ar secsize ) +after suffix interpretation. +.Pp +If no +.Fl s Ar size +is specified then the filesystem size defaults to that of the partition, or, +if +.Fl F +is specified, the existing file. +.Pp +If +.Ar size +is negative the specified size is subtracted from the default size +(reserving space at the end of the partition). +.It Fl V Ar verbose +This controls the amount of information written to stdout: +.Bl -tag -width 3n -offset indent -compact +.It 0 +No output +.It 1 +Overall size and cylinder group details. +.It 2 +A progress bar (dots ending at right hand margin). +.It 3 +The first few super-block backup sector numbers are displayed before the +progress bar. +.It 4 +All the super-block backup sector numbers are displayed (no progress bar). +.El +The default is 4. +If +.Fl N +is specifed +.Nm +stops before outputting the progress bar. +.It Fl v Ar volname +This specifies a volume name for the file system. +.It Fl Z +Pre-zeros the file system image created with +.Fl F . +This is necessary if the image is to be used by +.Xr vnd 4 +(which doesn't support file systems with +.Sq holes ) . +.El +.Pp +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 +.Nm +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 +.Xr fsck_ext2fs 8 +to find the alternative superblocks if the standard superblock is lost. +.Bl -tag -width Fl +.It Fl S Ar sector-size +The size of a sector in bytes (almost never anything but 512). +Defaults to 512. +.El +.Sh NOTES +There is no option to specify the metadata byte order on the file system +to be created because native Ext2 file system is always little endian +even on big endian hosts. +.Pp +The file system is created with +.Sq random +inode generation numbers to improve NFS security. +.Pp +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. +.Pp +For the +.Nm +command to succeed, +the disk label should first be updated such that the fstype field for the +partition is set to +.Ql Linux Ext2 , +unless +.Fl F +or +.Fl I +is used. +.Pp +The partition size is found using +.Xr fstat 2 +not by inspecting the disklabel. +The block size and fragment size will be written back to the disklabel +only if the last character of +.Ar special +references the same partition as the minor device number. +.Sh SEE ALSO +.Xr fstat 2 , +.Xr disklabel 5 , +.Xr disktab 5 , +.Xr fs 5 , +.Xr disklabel 8 , +.\" .Xr dumpfs 8 , +.Xr fsck_ext2fs 8 , +.Xr mount 8 , +.Xr mount_ext2fs 8 , +.Xr newfs 8 , +.Rs +.%A Remy Card +.%A Theodore Ts'o +.%A Stephen Tweedie +.%T "Design and Implementation of the Second Extended Filesystem" +.%J "The Proceedings of the First Dutch International Symposium on Linux" +.%U http://e2fsprogs.sourceforge.net/ext2intro.html +.Re +.Sh HISTORY +The +.Nm +command first appeared in +.Nx 5.0 . +.Sh AUTHORS +The +.Nm +command was written by +.An Izumi Tsutsui +.Aq tsutsui@NetBSD.org . +.Sh BUGS +The +.Nm +command is still experimental and there are few sanity checks. +.Pp +The +.Nm +command doesn't have options to specify each REV1 file system feature +independently. +.Pp +The +.Nm +command doesn't support the bad block list accounted by the bad blocks inode. +.Pp +Many newer Ext2 file system features (especially journaling) are +not supported yet. +.Pp +Some features in file systems created by the +.Nm +command might not be recognized properly by the +.Xr fsck_ext2fs 8 +utility. +.Pp +There is no native tool in the +.Ox +distribution for resizing Ext2 file systems yet. + |