mke2fs.8 (25878B)
- .\" -*- nroff -*-
- .\" 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 "Aug 2021" "E2fsprogs version 1.46.4"
- .SH NAME
- mke2fs \- create an ext2/ext3/ext4 file system
- .SH SYNOPSIS
- .B mke2fs
- [
- .B \-c
- |
- .B \-l
- .I filename
- ]
- [
- .B \-b
- .I block-size
- ]
- [
- .B \-C
- .I cluster-size
- ]
- [
- .B \-d
- .I root-directory
- ]
- [
- .B \-D
- ]
- [
- .B \-g
- .I blocks-per-group
- ]
- [
- .B \-G
- .I number-of-groups
- ]
- [
- .B \-i
- .I bytes-per-inode
- ]
- [
- .B \-I
- .I inode-size
- ]
- [
- .B \-j
- ]
- [
- .B \-J
- .I journal-options
- ]
- [
- .B \-N
- .I number-of-inodes
- ]
- [
- .B \-n
- ]
- [
- .B \-m
- .I reserved-blocks-percentage
- ]
- [
- .B \-o
- .I creator-os
- ]
- [
- .B \-O
- [^]\fIfeature\fR[,...]
- ]
- [
- .B \-q
- ]
- [
- .B \-r
- .I fs-revision-level
- ]
- [
- .B \-E
- .I extended-options
- ]
- [
- .B \-v
- ]
- [
- .B \-F
- ]
- [
- .B \-L
- .I volume-label
- ]
- [
- .B \-M
- .I last-mounted-directory
- ]
- [
- .B \-S
- ]
- [
- .B \-t
- .I fs-type
- ]
- [
- .B \-T
- .I usage-type
- ]
- [
- .B \-U
- .I UUID
- ]
- [
- .B \-V
- ]
- [
- .B \-e
- .I errors-behavior
- ]
- [
- .B \-z
- .I undo_file
- ]
- .I device
- [
- .I fs-size
- ]
- .sp
- .B "mke2fs \-O journal_dev"
- [
- .B \-b
- .I block-size
- ]
- .\" No external-journal specific journal options yet (size is ignored)
- .\" [
- .\" .B \-J
- .\" .I journal-options
- .\" ]
- [
- .B \-L
- .I volume-label
- ]
- [
- .B \-n
- ]
- [
- .B \-q
- ]
- [
- .B \-v
- ]
- .I external-journal
- [
- .I fs-size
- ]
- .SH DESCRIPTION
- .B mke2fs
- is used to create an ext2, ext3, or ext4 file system, usually in a disk
- partition (or file) named by
- .IR device .
- .PP
- The file system size is specified by
- .IR fs-size .
- If
- .I fs-size
- does not have a suffix, it is interpreted as power-of-two kilobytes,
- unless the
- .B \-b
- .I blocksize
- option is specified, in which case
- .I fs-size
- is interpreted as the number of
- .I blocksize
- blocks. If the fs-size is suffixed by 'k', 'm', 'g', 't'
- (either upper-case or lower-case), then it is interpreted in
- power-of-two kilobytes, megabytes, gigabytes, terabytes, etc.
- If
- .I fs-size
- is omitted,
- .B mke2fs
- will create the file system based on the device size.
- .PP
- If
- .B mke2fs
- is run as
- .B mkfs.XXX
- (i.e.,
- .BR mkfs.ext2 ,
- .BR mkfs.ext3 ,
- or
- .BR mkfs.ext4 )
- the option
- .B \-t
- .I XXX
- is implied; so
- .B mkfs.ext3
- will create a file system for use with ext3,
- .B mkfs.ext4
- will create a file system for use with ext4, and so on.
- .PP
- The defaults of the parameters for the newly created file system, if not
- overridden by the options listed below, are controlled by the
- .B /etc/mke2fs.conf
- configuration file. See the
- .BR mke2fs.conf (5)
- manual page for more details.
- .SH OPTIONS
- .TP
- .BI \-b " block-size"
- Specify the size of blocks in bytes. Valid block-size values are powers of two
- from 1024 up to 65536 (however note that the kernel is able to mount only
- file systems with block-size smaller or equal to the system page size - 4k on
- x86 systems, up to 64k on ppc64 or aarch64 depending on kernel configuration).
- If omitted, block-size is heuristically determined by the file system size and
- the expected usage of the file system (see the
- .B \-T
- option). In most common cases, the default block size is 4k. If
- .I block-size
- is preceded by a negative sign ('-'), then
- .B mke2fs
- will use heuristics to determine the
- appropriate block size, with the constraint that the block size will be
- at least
- .I block-size
- bytes. This is useful for certain hardware devices which require that
- the blocksize be a multiple of 2k.
- .TP
- .B \-c
- Check the device for bad blocks before creating the file system. If
- this option is specified twice, then a slower read-write
- test is used instead of a fast read-only test.
- .TP
- .B \-C " cluster-size"
- Specify the size of cluster in bytes for file systems using the bigalloc
- feature. Valid cluster-size values are from 2048 to 256M bytes per
- cluster. This can only be specified if the bigalloc feature is
- enabled. (See the
- .B ext4 (5)
- man page for more details about bigalloc.) The default cluster size if
- bigalloc is enabled is 16 times the block size.
- .TP
- .BI \-d " root-directory"
- Copy the contents of the given directory into the root directory of the
- file system.
- .TP
- .B \-D
- Use direct I/O when writing to the disk. This avoids mke2fs dirtying a
- lot of buffer cache memory, which may impact other applications running
- on a busy server. This option will cause mke2fs to run much more
- slowly, however, so there is a tradeoff to using direct I/O.
- .TP
- .BI \-e " error-behavior"
- Change the behavior of the kernel code when errors are detected.
- In all cases, a file system error will cause
- .BR e2fsck (8)
- to check the file system on the next boot.
- .I error-behavior
- can be one of the following:
- .RS 1.2i
- .TP 1.2i
- .B continue
- Continue normal execution.
- .TP
- .B remount-ro
- Remount file system read-only.
- .TP
- .B panic
- Cause a kernel panic.
- .RE
- .TP
- .BI \-E " extended-options"
- Set extended options for the file system. Extended options are comma
- separated, and may take an argument using the equals ('=') sign. The
- .B \-E
- option used to be
- .B \-R
- in earlier versions of
- .BR mke2fs .
- The
- .B \-R
- option is still accepted for backwards compatibility, but is deprecated.
- The following extended options are supported:
- .RS 1.2i
- .TP
- .BI encoding= encoding-name
- Enable the
- .I casefold
- feature in the super block and set
- .I encoding-name
- as the encoding to be used. If
- .I encoding-name
- is not specified, the encoding defined in
- .BR mke2fs.conf (5)
- is used.
- .TP
- .BI encoding_flags= encoding-flags
- Define parameters for file name character encoding operations. If a
- flag is not changed using this parameter, its default value is used.
- .I encoding-flags
- should be a comma-separated lists of flags to be enabled. To disable a
- flag, add it to the list with the prefix "no".
- The only flag that can be set right now is
- .I strict
- which means that invalid strings should be rejected by the file system.
- In the default configuration, the
- .I strict
- flag is disabled.
- .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 file system for a RAID array with
- .I stride-size
- file system blocks. This is the number of blocks read or written to disk
- before moving to the next disk, which is sometimes referred to as the
- .I chunk size.
- This mostly affects placement of file system metadata like bitmaps at
- .B mke2fs
- 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
- Configure the file system for a RAID array with
- .I stripe-width
- file system blocks per stripe. This is typically stride-size * N, where
- N is the number of data-bearing disks in the RAID (e.g. for RAID 5 there is one
- parity disk, so N will be the number of disks in the array minus 1).
- This allows the block allocator to prevent read-modify-write of the
- parity in a RAID stripe if possible when the data is written.
- .TP
- .BI offset= offset
- Create the file system at an offset from the beginning of the device or
- file. This can be useful when creating disk images for virtual machines.
- .TP
- .BI resize= max-online-resize
- Reserve enough space so that the block group descriptor table can grow
- to support a file system that has
- .I max-online-resize
- blocks.
- .TP
- .B lazy_itable_init\fR[\fB= \fI<0 to disable, 1 to enable>\fR]
- If enabled and the uninit_bg feature is enabled, the inode table will
- not be fully initialized by
- .BR mke2fs .
- This speeds up file system
- initialization noticeably, but it requires the kernel to finish
- initializing the file system in the background when the file system is
- first mounted. If the option value is omitted, it defaults to 1 to
- 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 file system 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 no_copy_xattrs
- Normally
- .B mke2fs
- will copy the extended attributes of the files in the directory
- hierarchy specified via the (optional)
- .B \-d
- option. This will disable the copy and leaves the files in the newly
- created file system without any extended attributes.
- .TP
- .BI num_backup_sb= <0|1|2>
- If the
- .B sparse_super2
- file system feature is enabled this option controls whether there will
- be 0, 1, or 2 backup superblocks created in the file system.
- .TP
- .B packed_meta_blocks\fR[\fB= \fI<0 to disable, 1 to enable>\fR]
- Place the allocation bitmaps and the inode table at the beginning of the
- disk. This option requires that the flex_bg file system feature to be
- enabled in order for it to have effect, and will also create the journal
- at the beginning of the file system. This option is useful for flash
- devices that use SLC flash at the beginning of the disk.
- It also maximizes the range of contiguous data blocks, which
- can be useful for certain specialized use cases, such as supported
- Shingled Drives.
- .TP
- .BI root_owner [=uid:gid]
- Specify the numeric user and group ID of the root directory. If no UID:GID
- is specified, use the user and group ID of the user running \fBmke2fs\fR.
- In \fBmke2fs\fR 1.42 and earlier the UID and GID of the root directory were
- set by default to the UID and GID of the user running the mke2fs command.
- The \fBroot_owner=\fR option allows explicitly specifying these values,
- and avoid side-effects for users that do not expect the contents of the
- file system to change based on the user running \fBmke2fs\fR.
- .TP
- .B test_fs
- Set a flag in the file system superblock indicating that it may be
- mounted using experimental kernel code, such as the ext4dev file system.
- .TP
- .B discard
- Attempt to discard blocks at mkfs time (discarding blocks initially is useful
- on solid state devices and sparse / thin-provisioned storage). When the device
- advertises that discard also zeroes data (any subsequent read after the discard
- and before write returns zero), then mark all not-yet-zeroed inode tables as
- zeroed. This significantly speeds up file system initialization. This is set
- as default.
- .TP
- .B nodiscard
- Do not attempt to discard blocks at mkfs time.
- .TP
- .B quotatype
- Specify the which quota types (usrquota, grpquota, prjquota) which
- should be enabled in the created file system. The argument of this
- extended option should be a colon separated list. This option has
- effect only if the
- .B quota
- feature is set. The default quota types to be initialized if this
- option is not specified is both user and group quotas. If the project
- feature is enabled that project quotas will be initialized as well.
- .RE
- .TP
- .B \-F
- Force
- .B mke2fs
- to create a file system, even if the specified device is not a partition
- on a block special device, or if other parameters do not make sense.
- In order to force
- .B mke2fs
- to create a file system even if the file system appears to be in use
- or is mounted (a truly dangerous thing to do), this option must be
- specified twice.
- .TP
- .BI \-g " blocks-per-group"
- Specify the number of blocks in a block group. There is generally no
- reason for the user to ever set this parameter, as the default is optimal
- for the file system. (For administrators who are creating
- file systems on RAID arrays, it is preferable to use the
- .I stride
- RAID parameter as part of the
- .B \-E
- option rather than manipulating the number of blocks per group.)
- This option is generally used by developers who
- are developing test cases.
- .IP
- If the bigalloc feature is enabled, the
- .B \-g
- option will specify the number of clusters in a block group.
- .TP
- .BI \-G " number-of-groups"
- Specify the number of block groups that will be packed together to
- create a larger virtual block group (or "flex_bg group") in an
- ext4 file system. This improves meta-data locality and performance
- on meta-data heavy workloads. The number of groups must be a power
- of 2 and may only be specified if the
- .B flex_bg
- file system feature is enabled.
- .TP
- .BI \-i " bytes-per-inode"
- Specify the bytes/inode ratio.
- .B mke2fs
- creates an inode for every
- .I bytes-per-inode
- bytes of space on the disk. The larger the
- .I bytes-per-inode
- ratio, the fewer inodes will be created. This value generally shouldn't
- be smaller than the blocksize of the file system, since in that case more
- inodes would be made than can ever be used. Be warned that it is not
- possible to change this ratio on a file system after it is created, so be
- careful deciding the correct value for this parameter. Note that resizing
- a file system changes the number of inodes to maintain this ratio.
- .TP
- .BI \-I " inode-size"
- Specify the size of each inode in bytes.
- The
- .I inode-size
- value must be a power of 2 larger or equal to 128. The larger the
- .I inode-size
- the more space the inode table will consume, and this reduces the usable
- space in the file system and can also negatively impact performance.
- It is not
- possible to change this value after the file system is created.
- .IP
- File systems with an inode size of 128 bytes do not support timestamps
- beyond January 19, 2038. Inodes which are 256 bytes or larger will
- support extended timestamps, project id's, and the ability to store some
- extended attributes in the inode table for improved performance.
- .IP
- The default inode size is controlled by the
- .BR mke2fs.conf (5)
- file. In the
- .B mke2fs.conf
- file shipped with e2fsprogs, the default inode size is 256 bytes for
- most file systems, except for small file systems where the inode size
- will be 128 bytes.
- .TP
- .B \-j
- Create the file system with an ext3 journal. If the
- .B \-J
- option is not specified, the default journal parameters will be used to
- create an appropriately sized journal (given the size of the file system)
- stored within the file system. Note that you must be using a kernel
- which has ext3 support in order to actually make use of the journal.
- .TP
- .BI \-J " journal-options"
- Create the ext3 journal using options specified on the command-line.
- Journal options are comma
- separated, and may take an argument using the equals ('=') sign.
- The following journal options are supported:
- .RS 1.2i
- .TP
- .BI size= journal-size
- Create an internal journal (i.e., stored inside the file system) of size
- .I journal-size
- megabytes.
- The size of the journal must be at least 1024 file system blocks
- (i.e., 1MB if using 1k blocks, 4MB if using 4k blocks, etc.)
- and may be no more than 10,240,000 file system blocks or half the total
- file system size (whichever is smaller)
- .TP
- .BI fast_commit_size= fast-commit-size
- Create an additional fast commit journal area of size
- .I fast-commit-size
- kilobytes.
- This option is only valid if
- .B fast_commit
- feature is enabled
- on the file system. If this option is not specified and if
- .B fast_commit
- feature is turned on, fast commit area size defaults to
- .I journal-size
- / 64 megabytes. The total size of the journal with
- .B fast_commit
- feature set is
- .I journal-size
- + (
- .I fast-commit-size
- * 1024) megabytes. The total journal size may be no more than
- 10,240,000 file system blocks or half the total file system size
- (whichever is smaller).
- .TP
- .BI location =journal-location
- Specify the location of the journal. The argument
- .I journal-location
- can either be specified as a block number, or if the number has a units
- suffix (e.g., 'M', 'G', etc.) interpret it as the offset from the
- beginning of the file system.
- .TP
- .BI device= external-journal
- Attach the file system to the journal block device located on
- .IR external-journal .
- The external
- journal must already have been created using the command
- .IP
- .B mke2fs -O journal_dev
- .I external-journal
- .IP
- Note that
- .I external-journal
- must have been created with the
- same block size as the new file system.
- In addition, while there is support for attaching
- multiple file systems to a single external journal,
- the Linux kernel and
- .BR e2fsck (8)
- do not currently support shared external journals yet.
- .IP
- Instead of specifying a device name directly,
- .I external-journal
- can also be specified by either
- .BI LABEL= label
- or
- .BI UUID= UUID
- to locate the external journal by either the volume label or UUID
- stored in the ext2 superblock at the start of the journal. Use
- .BR dumpe2fs (8)
- to display a journal device's volume label and UUID. See also the
- .B -L
- option of
- .BR tune2fs (8).
- .RE
- .IP
- Only one of the
- .BR size " or " device
- options can be given for a file system.
- .TP
- .BI \-l " filename"
- Read the bad blocks list from
- .IR filename .
- Note that the block numbers in the bad block list must be generated
- using the same block size as used by
- .BR mke2fs .
- As a result, the
- .B \-c
- option to
- .B mke2fs
- is a much simpler and less error-prone method of checking a disk for bad
- blocks before formatting it, as
- .B mke2fs
- will automatically pass the correct parameters to the
- .B badblocks
- program.
- .TP
- .BI \-L " new-volume-label"
- Set the volume label for the file system to
- .IR new-volume-label .
- The maximum length of the
- volume label is 16 bytes.
- .TP
- .BI \-m " reserved-blocks-percentage"
- Specify the percentage of the file system blocks reserved for
- the super-user. This avoids fragmentation, and allows root-owned
- daemons, such as
- .BR syslogd (8),
- to continue to function correctly after non-privileged processes are
- prevented from writing to the file system. The default percentage
- is 5%.
- .TP
- .BI \-M " last-mounted-directory"
- Set the last mounted directory for the file system. This might be useful
- for the sake of utilities that key off of the last mounted directory to
- determine where the file system should be mounted.
- .TP
- .B \-n
- Causes
- .B mke2fs
- to not actually create a file system, but display what it
- would do if it were to create a file system. This can be used to
- determine the location of the backup superblocks for a particular
- file system, so long as the
- .B mke2fs
- parameters that were passed when the
- file system was originally created are used again. (With the
- .B \-n
- option added, of course!)
- .TP
- .BI \-N " number-of-inodes"
- Overrides the default calculation of the number of inodes that should be
- reserved for the file system (which is based on the number of blocks and
- the
- .I bytes-per-inode
- ratio). This allows the user to specify the number
- of desired inodes directly.
- .TP
- .BI \-o " creator-os"
- Overrides the default value of the "creator operating system" field of the
- file system. The creator field is set by default to the name of the OS the
- .B mke2fs
- executable was compiled for.
- .TP
- .B "\-O \fR[^]\fIfeature\fR[,...]"
- Create a file system with the given features (file system options),
- overriding the default file system options. The features that are
- enabled by default are specified by the
- .I base_features
- relation, either in the
- .I [defaults]
- section in the
- .B /etc/mke2fs.conf
- configuration file,
- or in the
- .I [fs_types]
- subsections for the usage types as specified by the
- .B \-T
- option, further modified by the
- .I features
- relation found in the
- .I [fs_types]
- subsections for the file system and usage types. See the
- .BR mke2fs.conf (5)
- manual page for more details.
- The file system type-specific configuration setting found in the
- .I [fs_types]
- section will override the global default found in
- .IR [defaults] .
- .sp
- The file system feature set will be further edited
- using either the feature set specified by this option,
- or if this option is not given, by the
- .I default_features
- relation for the file system type being created, or in the
- .I [defaults]
- section of the configuration file.
- .sp
- The file system feature set is comprised of a list of features, separated
- by commas, that are to be enabled. To disable a feature, simply
- prefix the feature name with a caret ('^') character.
- Features with dependencies will not be removed successfully.
- The pseudo-file system feature "none" will clear all file system features.
- .TP
- For more information about the features which can be set, please see
- the manual page
- .BR ext4 (5).
- .TP
- .B \-q
- Quiet execution. Useful if
- .B mke2fs
- is run in a script.
- .TP
- .BI \-r " revision"
- Set the file system revision for the new file system. Note that 1.2
- kernels only support revision 0 file systems. The default is to
- create revision 1 file systems.
- .TP
- .B \-S
- Write superblock and group descriptors only. This is an extreme
- measure to be taken only in the very unlikely case that all of
- the superblock and backup superblocks are corrupted, and a last-ditch
- recovery method is desired by experienced users. It causes
- .B mke2fs
- to reinitialize the superblock and group descriptors, while not
- touching the inode table and the block and inode bitmaps. The
- .B e2fsck
- program should be run immediately after this option is used, and there
- is no guarantee that any data will be salvageable. Due to the wide
- variety of possible options to
- .B mke2fs
- that affect the on-disk layout, it is critical to specify exactly
- the same format options, such as blocksize, fs-type, feature flags, and
- other tunables when using this option, or the file system will be further
- corrupted. In some cases, such as file systems that have been resized,
- or have had features enabled after format time, it is impossible to
- overwrite all of the superblocks correctly, and at least some file system
- corruption will occur. It is best to run this on a full copy of the
- file system so other options can be tried if this doesn't work.
- .\" .TP
- .\" .BI \-t " test"
- .\" Check the device for bad blocks before creating the file system
- .\" using the specified test.
- .TP
- .BI \-t " fs-type"
- Specify the file system type (i.e., ext2, ext3, ext4, etc.) that is
- to be created.
- If this option is not specified,
- .B mke2fs
- will pick a default either via how
- the command was run (for example, using a name of the form mkfs.ext2,
- mkfs.ext3, etc.) or via a default as defined by the
- .B /etc/mke2fs.conf
- file. This option controls which file system options are used by
- default, based on the
- .B fstypes
- configuration stanza in
- .BR /etc/mke2fs.conf .
- .sp
- If the
- .B \-O
- option is used to explicitly add or remove file system options that
- should be set in the newly created file system, the
- resulting file system may not be supported by the requested
- .IR fs-type .
- (e.g., "\fBmke2fs \-t ext3 \-O extent /dev/sdXX\fR" will create a
- file system 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 file system that does not have a journal and hence will not
- be supported by the ext3 file system code in the Linux kernel.)
- .TP
- .BI \-T " usage-type[,...]"
- Specify how the file system is going to be used, so that
- .B mke2fs
- can choose optimal file system parameters for that use. The usage
- types that are supported are defined in the configuration file
- .BR /etc/mke2fs.conf .
- The user may specify one or more usage types
- using a comma separated list.
- .sp
- If this option is is not specified,
- .B mke2fs
- will pick a single default usage type based on the size of the file system to
- be created. If the file system size is less than 3 megabytes,
- .B mke2fs
- will use the file system type
- .IR floppy .
- If the file system size is greater than or equal to 3 but less than
- 512 megabytes,
- .BR mke2fs (8)
- will use the file system type
- .IR small .
- If the file system size is greater than or equal to 4 terabytes but less than
- 16 terabytes,
- .BR mke2fs (8)
- will use the file system type
- .IR big .
- If the file system size is greater than or equal to 16 terabytes,
- .BR mke2fs (8)
- will use the file system type
- .IR huge .
- Otherwise,
- .BR mke2fs (8)
- will use the default file system type
- .IR default .
- .TP
- .BI \-U " UUID"
- Set the universally unique identifier (UUID) of the file system to
- .IR UUID .
- The format of the UUID is a series of hex digits separated by hyphens,
- like this:
- "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
- The
- .I UUID
- parameter may also be one of the following:
- .RS 1.2i
- .TP
- .I clear
- clear the file system UUID
- .TP
- .I random
- generate a new randomly-generated UUID
- .TP
- .I time
- generate a new time-based UUID
- .RE
- .TP
- .B \-v
- Verbose execution.
- .TP
- .B \-V
- Print the version number of
- .B mke2fs
- and exit.
- .TP
- .BI \-z " undo_file"
- Before overwriting a file system block, write the old contents of the block to
- an undo file. This undo file can be used with e2undo(8) to restore the old
- contents of the file system should something go wrong. If the empty string is
- passed as the undo_file argument, the undo file will be written to a file named
- mke2fs-\fIdevice\fR.e2undo in the directory specified via the
- \fIE2FSPROGS_UNDO_DIR\fR environment variable or the \fIundo_dir\fR directive
- in the configuration file.
- WARNING: The undo file cannot be used to recover from a power or system crash.
- .SH ENVIRONMENT
- .TP
- .B 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
- .B MKE2FS_CONFIG
- Determines the location of the configuration file (see
- .BR mke2fs.conf (5)).
- .TP
- .B 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
- .B MKE2FS_DEVICE_SECTSIZE
- If set to non-zero integer value, its value is used to determine logical
- sector size of the
- .IR device .
- .TP
- .B MKE2FS_DEVICE_PHYS_SECTSIZE
- If set to non-zero integer value, its value is used to determine physical
- sector size of the
- .IR device .
- .TP
- .B MKE2FS_SKIP_CHECK_MSG
- If set, do not show the message of file system automatic check caused by
- mount count or check interval.
- .SH AUTHOR
- This version of
- .B mke2fs
- has been written by Theodore Ts'o <tytso@mit.edu>.
- .SH AVAILABILITY
- .B mke2fs
- is part of the e2fsprogs package and is available from
- http://e2fsprogs.sourceforge.net.
- .SH SEE ALSO
- .BR mke2fs.conf (5),
- .BR badblocks (8),
- .BR dumpe2fs (8),
- .BR e2fsck (8),
- .BR tune2fs (8),
- .BR ext4 (5)