mirror of https://github.com/vitalif/e2fsprogs
182 lines
4.4 KiB
Groff
182 lines
4.4 KiB
Groff
.\" Revision 1.0 93/06/3 23:00 chk
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.\" Initial revision
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.\"
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.\"
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.TH TUNE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
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.SH NAME
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tune2fs \- adjust tunable filesystem parameters on second extended filesystems
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.SH SYNOPSIS
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.B tune2fs
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[
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.B \-l
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]
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[
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.B \-c
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.I max-mount-counts
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]
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[
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.B \-e
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.I errors-behavior
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]
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[
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.B \-i
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.I interval-between-checks
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]
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[
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.B \-m
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.I reserved-blocks-percentage
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]
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[
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.B \-r
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.I reserved-blocks-count
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]
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[
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.B \-s
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.I sparse-super-flag
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]
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[
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.B \-u
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.I user
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]
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[
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.B \-g
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.I group
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]
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[
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.B \-C
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.I mount-count
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]
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[
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.B \-L
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.I volume-name
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]
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[
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.B \-M
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.I last-mounted-directory
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]
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[
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.B \-O
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\fR[^]\fIfeature\fR[,...]
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]
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[
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.B \-U
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.I UUID
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]
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device
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.SH DESCRIPTION
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.BI tune2fs
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adjusts tunable filesystem parameters on a Linux second extended filesystem.
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.SH OPTIONS
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.TP
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.BI \-c " max-mount-counts"
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adjust the maximal mounts count between two filesystem checks. If
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.I max-mount-counts
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is -1 then the number of times the filesystem is mounted will be disregarded
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by e2fsck and the kernel.
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.TP
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.BI \-e " error-behavior"
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change the behavior of the kernel code when errors are detected.
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.I error-behavior
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can be one of the following:
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.br
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\ continue\ \ Continue normal execution.
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.br
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\ remount-ro\ Remount filesystem read-only.
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.br
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\ panic\ \ Cause a kernel panic.
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.TP
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.BI \-g " group"
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set the user group which can benefit from the reserved blocks.
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.br
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.I group
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can be a numerical gid or a group name. If a group name is given,
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it is converted to a numerical gid before it is stored in the superblock.
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.TP
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.BI \-i " interval-between-checks\fR[\fBd\fR|\fBm\fR|\fBw\fR]"
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adjust the maximal time between two filesystem checks.
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No postfix or
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.B d
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result in days,
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.B m
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in months, and
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.B w
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in weeks. A value of zero will disable the timedependent checking.
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.TP
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.B \-l
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list the contents of the filesystem superblock.
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.TP
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.BI \-m " reserved-blocks-percentage"
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adjust the reserved blocks percentage on the given device.
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.TP
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.BI \-r " reserved-blocks-count"
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adjust the reserved blocks count on the given device.
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.TP
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.BI \-s " sparse_super_flag"
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set or reset the sparse_superblock flag. The sparse_superblock feature
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saves space on really big filesystems.
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.B Warning:
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The Linux 2.0 kernel does not properly support this feature. Neither do
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all Linux 2.1 kernels; please don't use this unless you know what you're
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doing!
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.TP
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.BI \-u " user"
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set the user who can benefit from the reserved blocks.
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.I user
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can be a numerical uid or a user name. If a user name is given, it
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is converted to a numerical uid before it is stored in the superblock.
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.TP
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.BI \-C " mount-count"
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set the number of times the filesystem has been mounted.
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.TP
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.BI \-L " volume-label"
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set the volume label of the filesystem.
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Ext2 filesystem labels can be at most 16 characters long; if
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.I volume-label
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is longer than 16 characters,
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.B tune2fs
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will truncate it and print a warning message.
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.TP
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.BI \-M " last-mounted-directory"
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set the last-mounted directory for the filesystem.
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.TP
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.BI \-O " \fR[^]\fIfeature\fR[,...]"
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set or clear the indicated filesystem features (options) in the filesystem.
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.I Feature
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can be one of the following supported filesystem options:
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.IR sparse_super ,
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which will cause the filesystem to use sparse superblocks, and
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.IR filetype ,
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which will cause the filesystem to store file type information in
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directory entries. After setting or clearing either filesystem feature,
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e2fsck must be run on the filesystem.
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.TP
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.BI \-U " UUID"
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set the UUID of the filesystem. A sample UUID looks like this:
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"c1b9d5a2-f162-11cf-9ece-0020afc76f16". The uuid may also be
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.IR null ,
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which will set the filesystem UUID to the null UUID. The uuid may also be
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.IR random ,
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which will generate a new random UUID for the filesystem.
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.SH BUGS
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We haven't found any bugs yet. Perhaps there are bugs but it's unlikely.
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.SH WARNING
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Never use tune2fs to change parameters of a read/write mounted filesystem!
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.B Use this utility
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.B at your own risk.
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You're modifying a filesystem!
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.SH AUTHOR
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.B tune2fs
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was written by Remy Card <Remy.Card@linux.org>.
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.B tune2fs
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uses the ext2fs library written by Theodore Ts'o <tytso@mit.edu>.
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This manual page was written by Christian Kuhtz <chk@data-hh.Hanse.DE>.
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Timedependent checking was added by Uwe Ohse <uwe@tirka.gun.de>.
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.SH AVAILABILITY
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.B tune2fs
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is part of the e2fsprogs package and is available for anonymous
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ftp from tsx-11.mit.edu in /pub/linux/packages/ext2fs.
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.SH SEE ALSO
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.BR dumpe2fs (8),
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.BR e2fsck (8),
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.BR mke2fs (8)
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