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NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | OPTIONS | EXIT STATUS | SEE ALSO | AVAILABILITY | COLOPHON |
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
return value.
-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 example 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
2017-07-05. If you discover any rendering problems in this HTML ver‐
sion 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 man‐
ual 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)