MKFS.F2FS(8)

NAME
mkfs.f2fs - create an F2FS file system

SYNOPSIS
mkfs.f2fs [ -c device-list ] [ -d debug-level ] [ -e extension-list ] [ -E extension-list ] [ -f ] [ -g default-options ] [ -H ] [ -i ] [ -l volume-label ] [ -m ] [ -o overprovision-ratio-percentage ] [ -O feature-list ] [ -C encoding:flags ] [ -q ] [ -r ] [ -R root_owner ] [ -s #-of-segments-per-section ] [ -S ] [ -t nodiscard/discard ] [ -T timestamp ] [ -w wanted-sector-size ] [ -z #-of-sections-per-zone ] [ -V ] [ -Z #-of-reserved-sections ] device [sectors]

DESCRIPTION
mkfs.f2fs is used to create a f2fs file system (usually in a disk partition). device is the special file corresponding to the device (e.g. /dev/sdXX). sectors is optionally given for specifying the filesystem size.

The exit code returned by mkfs.f2fs is 0 on success and 1 on failure.

OPTIONS

-a heap-based-allocation(deprecated)
    Specify 1 or 0 to enable/disable heap based block allocation policy. If the value is equal to 1, each of active log areas are initially assigned separately according to the whole volume size. The default value is 1.

-b block size
    Specify the block size in bytes. Valid blocksizes are powers of 2. Currently, the kernel is only able to mount f2fs filesystems where the block size matches the page size. The default value is 4096.

-c device-list
    Build f2fs with these additional devices, so that the user can see all the devices as one big volume. Supports up to 7 devices except meta device.

-d debug-level
    Specify the level of debugging options. The default number is 0, which shows basic debugging messages.

-e extension-list
    Specify a list of file extensions that f2fs will treat as cold files. The data of files with those extensions will be stored in the cold log. The default list includes most of the multimedia file extensions such as jpg, gif, mpeg, mkv, and so on.

-E extension-list
    Specify a list of file extensions that f2fs will treat as hot files. The data of files with those extensions will be stored in the hot log. The default list includes database file extensions, such as db.

-f  Force overwrite when an existing filesystem is detected on the device. By default, mkfs.f2fs will not write to the device if it suspects that there is a filesystem or partition table on the device already.

-g default-options
    Use a default set of options. The following values are supported:

    android
        Use default options for Android having "-d1 -f -w 4096 -R 0:0 -O encrypt -O project_quota,extra_attr,{quota} -O verity".

-H  Specify support write hint.

-i  Enable extended node bitmap.

-l volume-label
    Specify the volume label to the partition mounted as F2FS.

-m  Specify f2fs filesystem to supports the block zoned feature. Without it, the filesystem doesn't support the feature.

-o overprovision-ratio-percentage
    Specify the percentage of the volume that will be used as overprovision area. This area is hidden to users, and utilized by F2FS cleaner. If not specified, the best number will be assigned automatically according to the partition size.

-O feature-list
    Set additional features for the filesystem. Features are comma separated, and the flag can be repeated. The following features are supported:

    encrypt
        Enable support for filesystem level encryption.

    extra_attr
        Enable extra attr feature, required for some of the other features.

    project_quota
        Enable project ID tracking. This is used for projet quota accounting. Requires extra attr.

    inode_checksum
        Enable inode checksum. Requires extra attr.

    flexible_inline_xattr
        Enable flexible inline xattr. Requires extra attr.

    quota
        Enable quotas.

    inode_crtime
        Enable inode creation time feature. Requires extra attr.

    lost_found
        Enable lost+found feature.

    verity
        Enable support for verity protected files (a.k.a. fs-verity).

    sb_checksum
        Enable superblock checksum.

    casefold
        Enable casefolding support in the filesystem. Optional flags can be passed with -C

    compression
        Enable support for filesystem level compression. Requires extra attr.

    ro  Enable readonly feature to eliminate OVP/SSA on-disk layout for small readonly partition.

-C encoding:flags
    Support casefolding with a specific encoding, with optional comma separated flags.

    encoding:

        utf8
            Use UTF-8 for casefolding.
    flags:

        strict
            This flag specifies that invalid strings should be rejected by the filesystem. Default is disabled.

-q  Quiet mode. With it, mkfs.f2fs does not show any messages, including the basic messages.

-r  Sets the checkpointing srand seed to 0.

-R  Give root_owner option for initial uid/gid assignment. Default is set by getuid()/getgid(), and assigned by "-R $uid:$gid".

-s #-of-segments-per-section
    Specify the number of segments per section. A section consists of multiple consecutive segments, and is the unit of garbage collection. The default number is 1, which means one segment is assigned to a section.

-S  Enable sparse mode.

-t 1/0
    Specify 1 or 0 to enable or disable discard policy, respectively. The default value is 1.

-T timestamp
    Set inodes times to a given timestamp. By default, the current time will be used. This behaviour corresponds to the value -1.

-w wanted-sector-size
    Specify the sector size in bytes. Without it, the sectors will be calculated by device sector size.

-z #-of-sections-per-zone
    Specify the number of sections per zone. A zone consists of multiple sections. F2FS allocates segments for active logs with separated zones as much as possible. The default number is 1, which means a zone consists of one section.

sectors
    Number of sectors. Default is determined by device size.

-V  Print the version number and exit.

-Z #-of-reserved-sections
    Specify the number of GC reserved sections for zoned device. If specified to non-zero, reserved segments count is set to the larger size between 8 sections and the input value. If specified to zero, the best number will be assigned automatically according to the partition size. If overprovision-ratio-percentage is not specified, it will set to default 3.0%. Without '-m' option, the filesystem doesn't support the feature.

-h, --help
    Print usage and exit.

AUTHOR
This version of mkfs.f2fs has been written by Jaegeuk Kim <jaegeuk.kim@samsung.com>.

AVAILABILITY
mkfs.f2fs is available from git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-tools.git.

SEE ALSO
mkfs(8), fsck.f2fs(8), dump.f2fs(8), defrag.f2fs(8), resize.f2fs(8), sload.f2fs(8).