90 lines
2.1 KiB
Plaintext
90 lines
2.1 KiB
Plaintext
//po4a: entry man manual
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= mkfs.cramfs(8)
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:doctype: manpage
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:man manual: System Administration
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:man source: util-linux {release-version}
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:page-layout: base
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:command: mkfs.cramfs
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== NAME
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mkfs.cramfs - make compressed ROM file system
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== SYNOPSIS
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*mkfs.cramfs* [options] _directory file_
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== DESCRIPTION
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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.
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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*(8)) to pack files into new cramfs images.
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File sizes are limited to less than 16 MB.
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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.)
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== ARGUMENTS
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The _directory_ is simply the root of the directory tree that we want to generate a compressed filesystem out of.
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The _file_ will contain the cram file system, which later can be mounted.
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== OPTIONS
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*-v*::
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Enable verbose messaging.
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*-E*::
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Treat all warnings as errors, which are reflected as command exit status.
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*-b* _blocksize_::
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Use defined block size, which has to be divisible by page size.
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*-e* _edition_::
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Use defined file system edition number in superblock.
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*-N* _big, little, host_::
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Use defined endianness. Value defaults to _host_.
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*-i* _file_::
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Insert a _file_ to cramfs file system.
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*-n* _name_::
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Set name of the cramfs file system.
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*-p*::
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Pad by 512 bytes for boot code.
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*-s*::
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This option is ignored. Originally the *-s* turned on directory entry sorting.
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*-z*::
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Make explicit holes.
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*-h*, *--help*::
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Display help text and exit.
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*-V*, *--version*::
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Display version information and exit.
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== EXIT STATUS
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*0*::
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success
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*8*::
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operation error, such as unable to allocate memory
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== SEE ALSO
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*fsck.cramfs*(8),
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*mount*(8)
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include::man-common/bugreports.adoc[]
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include::man-common/footer.adoc[]
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ifdef::translation[]
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include::man-common/translation.adoc[]
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endif::[]
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