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NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | OPTIONS | EXIT STATUS | SEE ALSO | AVAILABILITY | COLOPHON |
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MKFS.CRAMFS(8) System Administration MKFS.CRAMFS(8)
mkfs.cramfs - make compressed ROM file system
mkfs.cramfs [options] directory file
Files on cramfs file systems are zlib-compressed one page at a
time to allow random read access. The metadata is not
compressed, but is expressed in a terse representation that is
more space-efficient than conventional file systems.
The file system is intentionally read-only to simplify its
design; random write access for compressed files is difficult to
implement. cramfs ships with a utility (mkcramfs) to pack files
into new cramfs images.
File sizes are limited to less than 16 MB.
Maximum file system size is a little under 272 MB. (The last
file on the file system must begin before the 256 MB block, but
can extend past it.)
The directory is simply the root of the directory tree that we
want to generate a compressed filesystem out of.
The file will contain the cram file system, which later can be
mounted.
-v Enable verbose messaging.
-E Treat all warnings as errors, which are reflected as
command exit status.
-b blocksize
Use defined block size, which has to be divisible by page
size.
-e edition
Use defined file system edition number in superblock.
-N big, little, host
Use defined endianness. Value defaults to host.
-i file
Insert a file to cramfs file system.
-n name
Set name of the cramfs file system.
-p Pad by 512 bytes for boot code.
-s This option is ignored. Originally the -s turned on
directory entry sorting.
-z Make explicit holes.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
0 success
8 operation error, such as unable to allocate memory
fsck.cramfs(8), mount(8)
The mkfs.cramfs command is part of the util-linux package and is
available from Linux Kernel Archive
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found
at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you
have a bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
util-linux April 2013 MKFS.CRAMFS(8)
Pages that refer to this page: fsck.cramfs(8), systemd-makefs@.service(8)
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