.\" Copyright 1993, 1994, 1995 by Theodore Ts'o. All Rights Reserved.
.\" This file may be copied under the terms of the GNU Public License.
.\"
-.TH MKE2FS 8 "December 2010" "E2fsprogs version 1.41.14"
+.TH MKE2FS 8 "February 2012" "E2fsprogs version 1.42.1"
.SH NAME
mke2fs \- create an ext2/ext3/ext4 filesystem
.SH SYNOPSIS
following extended options are supported:
.RS 1.2i
.TP
+.BI mmp_update_interval= interval
+Adjust the initial MMP update interval to
+.I interval
+seconds. Specifying an
+.I interval
+of 0 means to use the default interval. The specified interval must
+be less than 300 seconds. Requires that the
+.B mmp
+feature be enabled.
+.TP
.BI stride= stride-size
Configure the filesystem for a RAID array with
.I stride-size
time to avoid placing them on a single disk, which can hurt performance.
It may also be used by the block allocator.
.TP
-.BI stripe-width= stripe-width
+.BI stripe_width= stripe-width
Configure the filesystem for a RAID array with
.I stripe-width
filesystem blocks per stripe. This is typically stride-size * N, where
initialization noticeably, but it requires the kernel to finish
initializing the filesystem in the background when the filesystem is
first mounted. If the option value is omitted, it defaults to 1 to
-enable lazy inode table initialization.
+enable lazy inode table zeroing.
+.TP
+.B lazy_journal_init\fR[\fB= \fI<0 to disable, 1 to enable>\fR]
+If enabled, the journal inode will not be fully zeroed out by
+.BR mke2fs .
+This speeds up filesystem initialization noticeably, but carries some
+small risk if the system crashes before the journal has been overwritten
+entirely one time. If the option value is omitted, it defaults to 1 to
+enable lazy journal inode zeroing.
.TP
.B test_fs
Set a flag in the filesystem superblock indicating that it may be
as default.
.TP
.BI nodiscard
-Do not attempt to discard blocks at mkfs time. This is the default.
+Do not attempt to discard blocks at mkfs time.
+.TP
+.BI quotatype
+Specify which quota type ('usr' or 'grp') is to be initialized. This
+option has any effect only if
+.B quota
+feature is set. Without this extended option, the default behavior is to
+initialize both user and group quotas.
.RE
.TP
.BI \-f " fragment-size"
megabytes.
The size of the journal must be at least 1024 filesystem blocks
(i.e., 1MB if using 1k blocks, 4MB if using 4k blocks, etc.)
-and may be no more than 102,400 filesystem blocks.
+and may be no more than 10,240,000 filesystem blocks or half the total
+file system size (whichever is smaller)
.TP
.BI device= external-journal
Attach the filesystem to the journal block device located on
Filesystem can contain files that are greater than 2GB. (Modern kernels
set this feature automatically when a file > 2GB is created.)
.TP
+.B quota
+Create quota inodes (inode# 3 for userquota and inode# 4 for group quota) and
+set them in the superblock. With this feature, the quotas will be enabled
+automatically when the filesystem is mounted.
+.TP
.B resize_inode
Reserve space so the block group descriptor table may grow in the future.
Useful for online resizing using
should be set in the newly created filesystem, the
resulting filesystem may not be supported by the requested
.IR fs-type .
-(e.g., "\fBmke2fs \-t ext3 \-O extents /dev/sdXX\fR" will create a
+(e.g., "\fBmke2fs \-t ext3 \-O extent /dev/sdXX\fR" will create a
filesystem that is not supported by the ext3 implementation as found in
the Linux kernel; and "\fBmke2fs \-t ext3 \-O ^has_journal /dev/hdXX\fR"
will create a filesystem that does not have a journal and hence will not
If the filesystem size is greater than 3 but less than or equal to
512 megabytes,
.BR mke2fs (8)
-will use the filesystem
+will use the filesystem type
.IR small .
+If the filesystem size is greater than or equal to 4 terabytes but less than
+16 terabytes,
+.BR mke2fs (8)
+will use the filesystem type
+.IR big .
+If the filesystem size is greater than or equal to 16 terabytes,
+.BR mke2fs (8)
+will use the filesystem type
+.IR huge .
Otherwise,
.BR mke2fs (8)
will use the default filesystem type
Print the version number of
.B mke2fs
and exit.
+.SH ENVIRONMENT
+.TP
+.BI MKE2FS_SYNC
+If set to non-zero integer value, its value is used to determine how often
+.BR sync (2)
+is called during inode table initialization.
+.TP
+.BI MKE2FS_CONFIG
+Determines the location of the configuration file (see
+.BR mke2fs.conf (5)).
+.TP
+.BI MKE2FS_FIRST_META_BG
+If set to non-zero integer value, its value is used to determine first meta
+block group. This is mostly for debugging purposes.
+.TP
+.BI MKE2FS_DEVICE_SECTSIZE
+If set to non-zero integer value, its value is used to determine physical
+sector size of the
+.IR device .
+.TP
+.BI MKE2FS_SKIP_CHECK_MSG
+If set, do not show the message of filesystem automatic check caused by
+mount count or check interval.
.SH AUTHOR
This version of
.B mke2fs
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