1 .\" Revision 1.0 93/06/3 23:00 chk
5 .TH TUNE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
7 tune2fs \- adjust tunable filesystem parameters on second extended filesystems
23 .I interval-between-checks
27 .I reserved-blocks-percentage
31 .I reserved-blocks-count
55 .I last-mounted-directory
59 \fR[^]\fIfeature\fR[,...]
68 adjusts tunable filesystem parameters on a Linux second extended filesystem.
71 .BI \-c " max-mount-counts"
72 adjust the maximal mounts count between two filesystem checks.
74 .BI \-e " error-behavior"
75 change the behavior of the kernel code when errors are detected.
77 can be one of the following:
79 \ continue\ \ Continue normal execution.
81 \ remount-ro\ Remount filesystem read-only.
83 \ panic\ \ Cause a kernel panic.
86 set the user group which can benefit from the reserved blocks.
89 can be a numerical gid or a group name.
91 .BI \-i " interval-between-checks\fR[\fBd\fR|\fBm\fR|\fBw\fR]"
92 adjust the maximal time between two filesystem checks.
99 in weeks. A value of zero will disable the timedependent checking.
102 list the contents of the filesystem superblock.
104 .BI \-m " reserved-blocks-percentage"
105 adjust the reserved blocks percentage on the given device.
107 .BI \-r " reserved-blocks-count"
108 adjust the reserved blocks count on the given device.
110 .BI \-s " sparse_super_flag"
111 set or reset the sparse_superblock flag. The sparse_superblock feature
112 saves space on really big filesystems.
114 The Linux 2.0 kernel does not properly support this feature. Neither do
115 all Linux 2.1 kernels; please don't use this unless you know what you're
119 set the user who can benefit from the reserved blocks.
121 can be a numerical uid or a user name.
123 .BI \-C " mount-count"
124 set the number of times the filesystem has been mounted.
126 .BI \-L " volume-label"
127 set the volume label of the filesystem.
128 Ext2 filesystem labels can be at most 16 characters long; if
130 is longer than 16 characters,
132 will truncate it and print a warning message.
134 .BI \-M " last-mounted-directory"
135 set the last-mounted directory for the filesystem.
137 .BI \-O " \fR[^]\fIfeature\fR[,...]"
138 set or clear the indicated filesystem features (options) in the filesystem.
140 can be one of the following supported filesystem options:
142 which cause the filesystem to use sparse superblocks, and
144 which will cause the filesystem to store file type information in
145 directory entries. After setting or clearing either filesystem feature,
146 e2fsck must be run on the filesystem.
149 set the UUID of the filesystem. A sample UUID looks like this:
150 "c1b9d5a2-f162-11cf-9ece-0020afc76f16". The uuid may also be
152 which will set the filesystem UUID to the null UUID. The uuid may also be
154 which will generate a new random UUID for the filesystem.
156 We haven't found any bugs yet. Perhaps there are bugs but it's unlikely.
158 Never use tune2fs to change parameters of a read/write mounted filesystem!
161 You're modifying a filesystem!
164 was written by Remy Card <card@masi.ibp.fr>, the developer and maintainer
167 uses the ext2fs library written by Theodore Ts'o <tytso@mit.edu>.
168 This manual page was written by Christian Kuhtz <chk@data-hh.Hanse.DE>.
169 Timedependent checking was added by Uwe Ohse <uwe@tirka.gun.de>.
172 is part of the e2fsprogs package and is available for anonymous
173 ftp from tsx-11.mit.edu in /pub/linux/packages/ext2fs.