NAME¶

SYNOPSIS¶

mke2fs -O journal_dev [ -b block-size ] [ -L volume-label ] [ -n ] [ -q ] [ -v ] external-journal [ fs-size ]

DESCRIPTION¶

The file system size is specified by fs-size. If fs-size does not have a suffix, it is interpreted as power-of-two kilobytes, unless the -b blocksize option is specified, in which case fs-size is interpreted as the number of 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 fs-size is omitted, mke2fs will create the file system based on the device size.

If mke2fs is run as mkfs.XXX (i.e., mkfs.ext2, mkfs.ext3, or mkfs.ext4) the option -t XXX is implied; so mkfs.ext3 will create a file system for use with ext3, mkfs.ext4 will create a file system for use with ext4, and so on.

The defaults of the parameters for the newly created filesystem, if not overridden by the options listed below, are controlled by the /etc/mke2fs.conf configuration file. See the mke2fs.conf(5) manual page for more details.

OPTIONS¶

-b block-size

Specify the size of blocks in bytes. Valid block-size values are 1024, 2048 and 4096 bytes per block. If omitted, block-size is heuristically determined by the filesystem size and the expected usage of the filesystem (see the -T option). If block-size is preceded by a negative sign ('-'), then mke2fs will use heuristics to determine the appropriate block size, with the constraint that the block size will be at least block-size bytes. This is useful for certain hardware devices which require that the blocksize be a multiple of 2k.

-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.

-C cluster-size

Specify the size of cluster in bytes for filesystems 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 ext4 (5) man page for more details about bigalloc.) The default cluster size if bigalloc is enabled is 16 times the block size.

-d root-directory

Copy the contents of the given directory into the root directory of the filesystem.

-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.

-e error-behavior

Change the behavior of the kernel code when errors are detected. In all cases, a filesystem error will cause e2fsck(8) to check the filesystem on the next boot. error-behavior can be one of the following:

-E extended-options

Set extended options for the filesystem. Extended options are comma separated, and may take an argument using the equals ('=') sign. The -E option used to be -R in earlier versions of mke2fs. The -R option is still accepted for backwards compatibility, but is deprecated. The following extended options are supported:

-F

Force mke2fs to create a filesystem, 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 mke2fs to create a filesystem even if the filesystem appears to be in use or is mounted (a truly dangerous thing to do), this option must be specified twice.

-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 filesystem. (For administrators who are creating filesystems on RAID arrays, it is preferable to use the stride RAID parameter as part of the -E option rather than manipulating the number of blocks per group.) This option is generally used by developers who are developing test cases.

If the bigalloc feature is enabled, the -g option will specify the number of clusters in a block group.

-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 filesystem. 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 flex_bg filesystem feature is enabled.

-i bytes-per-inode

Specify the bytes/inode ratio. mke2fs creates an inode for every bytes-per-inode bytes of space on the disk. The larger the bytes-per-inode ratio, the fewer inodes will be created. This value generally shouldn't be smaller than the blocksize of the filesystem, 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 filesystem after it is created, so be careful deciding the correct value for this parameter. Note that resizing a filesystem changes the number of inodes to maintain this ratio.

-I inode-size

Specify the size of each inode in bytes. The inode-size value must be a power of 2 larger or equal to 128. The larger the inode-size the more space the inode table will consume, and this reduces the usable space in the filesystem and can also negatively impact performance. It is not possible to change this value after the filesystem is created.

In kernels after 2.6.10 and some earlier vendor kernels it is possible to utilize inodes larger than 128 bytes to store extended attributes for improved performance. Extended attributes stored in large inodes are not visible with older kernels, and such filesystems will not be mountable with 2.4 kernels at all.

The default inode size is controlled by the mke2fs.conf(5) file. In the 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.

-j

Create the filesystem with an ext3 journal. If the -J option is not specified, the default journal parameters will be used to create an appropriately sized journal (given the size of the filesystem) stored within the filesystem. Note that you must be using a kernel which has ext3 support in order to actually make use of the journal.

-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:

Only one of the size or device options can be given for a filesystem.

-l filename

Read the bad blocks list from filename. Note that the block numbers in the bad block list must be generated using the same block size as used by mke2fs. As a result, the -c option to mke2fs is a much simpler and less error-prone method of checking a disk for bad blocks before formatting it, as mke2fs will automatically pass the correct parameters to the badblocks program.

-L new-volume-label

Set the volume label for the filesystem to new-volume-label. The maximum length of the volume label is 16 bytes.

-m reserved-blocks-percentage

Specify the percentage of the filesystem blocks reserved for the super-user. This avoids fragmentation, and allows root-owned daemons, such as syslogd(8), to continue to function correctly after non-privileged processes are prevented from writing to the filesystem. The default percentage is 5%.

-M last-mounted-directory

Set the last mounted directory for the filesystem. This might be useful for the sake of utilities that key off of the last mounted directory to determine where the filesystem should be mounted.

-n

Causes mke2fs to not actually create a filesystem, but display what it would do if it were to create a filesystem. This can be used to determine the location of the backup superblocks for a particular filesystem, so long as the mke2fs parameters that were passed when the filesystem was originally created are used again. (With the -n option added, of course!)

-N number-of-inodes

Overrides the default calculation of the number of inodes that should be reserved for the filesystem (which is based on the number of blocks and the bytes-per-inode ratio). This allows the user to specify the number of desired inodes directly.

-o creator-os

Overrides the default value of the "creator operating system" field of the filesystem. The creator field is set by default to the name of the OS the mke2fs executable was compiled for.

-O [^]feature[,...]

Create a filesystem with the given features (filesystem options), overriding the default filesystem options. The features that are enabled by default are specified by the base_features relation, either in the [defaults] section in the /etc/mke2fs.conf configuration file, or in the [fs_types] subsections for the usage types as specified by the -T option, further modified by the features relation found in the [fs_types] subsections for the filesystem and usage types. See the mke2fs.conf(5) manual page for more details. The filesystem type-specific configuration setting found in the [fs_types] section will override the global default found in [defaults].

The filesystem feature set will be further edited using either the feature set specified by this option, or if this option is not given, by the default_features relation for the filesystem type being created, or in the [defaults] section of the configuration file.

The filesystem 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-filesystem feature "none" will clear all filesystem features.

For more information about the features which can be set, please see

the manual page ext4(5).

-q

Quiet execution. Useful if mke2fs is run in a script.

-r revision

Set the filesystem revision for the new filesystem. Note that 1.2 kernels only support revision 0 filesystems. The default is to create revision 1 filesystems.

-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 mke2fs to reinitialize the superblock and group descriptors, while not touching the inode table and the block and inode bitmaps. The 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 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 filesystem will be further corrupted. In some cases, such as filesystems 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 filesystem corruption will occur. It is best to run this on a full copy of the filesystem so other options can be tried if this doesn't work.

-t fs-type

Specify the filesystem type (i.e., ext2, ext3, ext4, etc.) that is to be created. If this option is not specified, 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 /etc/mke2fs.conf file. This option controls which filesystem options are used by default, based on the fstypes configuration stanza in /etc/mke2fs.conf.

If the -O option is used to explicitly add or remove filesystem options that should be set in the newly created filesystem, the resulting filesystem may not be supported by the requested fs-type. (e.g., "mke2fs -t ext3 -O extent /dev/sdXX" will create a filesystem that is not supported by the ext3 implementation as found in the Linux kernel; and "mke2fs -t ext3 -O ^has_journal /dev/hdXX" will create a filesystem that does not have a journal and hence will not be supported by the ext3 filesystem code in the Linux kernel.)

-T usage-type[,...]

Specify how the filesystem is going to be used, so that mke2fs can choose optimal filesystem parameters for that use. The usage types that are supported are defined in the configuration file /etc/mke2fs.conf. The user may specify one or more usage types using a comma separated list.

If this option is is not specified, mke2fs will pick a single default usage type based on the size of the filesystem to be created. If the filesystem size is less than 3 megabytes, mke2fs will use the filesystem type floppy. If the filesystem size is greater than or equal to 3 but less than 512 megabytes, mke2fs(8) will use the filesystem type small. If the filesystem size is greater than or equal to 4 terabytes but less than 16 terabytes, mke2fs(8) will use the filesystem type big. If the filesystem size is greater than or equal to 16 terabytes, mke2fs(8) will use the filesystem type huge. Otherwise, mke2fs(8) will use the default filesystem type default.

-U UUID

Set the universally unique identifier (UUID) of the filesystem to UUID. The format of the UUID is a series of hex digits separated by hyphens, like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16". The UUID parameter may also be one of the following:

-v

Verbose execution.

-V

Print the version number of mke2fs and exit.

-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-device.e2undo in the directory specified via the E2FSPROGS_UNDO_DIR environment variable or the undo_dir directive in the configuration file.

WARNING: The undo file cannot be used to recover from a power or system crash.

ENVIRONMENT¶

MKE2FS_SYNC

If set to non-zero integer value, its value is used to determine how often sync(2) is called during inode table initialization.

MKE2FS_CONFIG

Determines the location of the configuration file (see mke2fs.conf(5)).

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.

MKE2FS_DEVICE_SECTSIZE

If set to non-zero integer value, its value is used to determine logical sector size of the device.

MKE2FS_DEVICE_PHYS_SECTSIZE

If set to non-zero integer value, its value is used to determine physical sector size of the device.

MKE2FS_SKIP_CHECK_MSG

If set, do not show the message of filesystem automatic check caused by mount count or check interval.

AUTHOR¶

AVAILABILITY¶

SEE ALSO¶