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April, 26th. 2006:
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MKFS.CRAMFS
Section: System Administration (8) Updated: April 2013 Index
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NAME
mkfs.cramfs - make compressed ROM file system
SYNOPSIS
mkfs.cramfs
[options]
directory file
DESCRIPTION
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.)
ARGUMENTS
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.
OPTIONS
- -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. Use of this option will require 2.3.39 kernel, or newer.
- -V
-
Display version information and exit.
- -h
-
Display help and exit.
EXIT STATUS
-
- 0
-
success
- 8
-
operation error, such as unable to allocate memory
SEE ALSO
fsck.cramfs(8),
mount(8)
AVAILABILITY
The example command is part of the util-linux package and is available from
Linux Kernel Archive
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ARGUMENTS
-
- OPTIONS
-
- EXIT STATUS
-
- SEE ALSO
-
- AVAILABILITY
-
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