268 lines
6.5 KiB
Groff
Executable File
268 lines
6.5 KiB
Groff
Executable File
.TH MKFS.JFFS2 1
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.SH NAME
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mkfs.jffs2 \- Create a JFFS2 file system image from directory
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.SH SYNOPSIS
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.B mkfs.jffs2
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[
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.B -p,--pad[=SIZE]
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]
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[
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.B -r,-d,--root
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.I directory
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]
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[
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.B -s,--pagesize=SIZE
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]
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[
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.B -e,--eraseblock=SIZE
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]
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[
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.B -c,--cleanmarker=SIZE
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]
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[
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.B -n,--no-cleanmarkers
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]
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[
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.B -o,--output
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.I image.jffs2
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]
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[
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.B -l,--little-endian
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]
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[
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.B -b,--big-endian
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]
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[
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.B -D,--devtable=FILE
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]
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[
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.B -f,--faketime
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]
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[
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.B -q,--squash
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]
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[
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.B -U,--squash-uids
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]
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[
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.B -P,--squash-perms
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]
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[
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.B --with-xattr
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]
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[
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.B --with-selinux
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]
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[
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.B --with-posix-acl
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]
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[
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.B -m,--compression-mode=MODE
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]
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[
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.B -x,--disable-compressor=NAME
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]
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[
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.B -X,--enable-compressor=NAME
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]
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[
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.B -y,--compressor-priority=PRIORITY:NAME
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]
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[
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.B -L,--list-compressors
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]
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[
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.B -t,--test-compression
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]
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[
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.B -h,--help
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]
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[
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.B -v,--verbose
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]
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[
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.B -V,--version
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]
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[
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.B -i,--incremental
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.I image.jffs2
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]
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.SH DESCRIPTION
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The program
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.B mkfs.jffs2
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creates a JFFS2 (Second Journalling Flash File System) file system
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image and writes the resulting image to the file specified by the
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.B -o
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option or by default to the standard output, unless the standard
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output is a terminal device in which case mkfs.jffs2 will abort.
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The file system image is created using the files and directories
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contained in the directory specified by the option
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.B -r
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or the present directory, if the
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.B -r
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option is not specified.
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Each block of the files to be placed into the file system image
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are compressed using one of the avaiable compressors depending
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on the selected compression mode.
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File systems are created with the same endianness as the host,
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unless the
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.B -b
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or
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.B -l
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options are specified. JFFS2 driver in the 2.4 Linux kernel only
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supported images having the same endianness as the CPU. As of 2.5.48,
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the kernel can be changed with a #define to accept images of the
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non-native endianness. Full bi-endian support in the kernel is not
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planned.
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It is unlikely that JFFS2 images are useful except in conjuction
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with the MTD (Memory Technology Device) drivers in the Linux
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kernel, since the JFFS2 file system driver in the kernel requires
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MTD devices.
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.SH OPTIONS
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Options that take SIZE arguments can be specified as either
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decimal (e.g., 65536), octal (0200000), or hexidecimal (0x1000).
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.TP
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.B -p, --pad[=SIZE]
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Pad output to SIZE bytes with 0xFF. If SIZE is not specified,
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the output is padded to the end of the final erase block.
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.TP
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.B -r, -d, --root=DIR
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Build file system from directory DIR. The default is the current
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directory.
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.TP
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.B -s, --pagesize=SIZE
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Use page size SIZE. The default is 4 KiB. This size is the
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maximum size of a data node.
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.TP
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.B -e, --eraseblock=SIZE
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Use erase block size SIZE. The default is 64 KiB. If you use a erase
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block size different than the erase block size of the target MTD
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device, JFFS2 may not perform optimally. If the SIZE specified is
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below 4096, the units are assumed to be KiB.
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.TP
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.B -c, --cleanmarker=SIZE
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Write \'CLEANMARKER\' nodes with the size specified. It is not
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normally appropriate to specify a size other than the default 12
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bytes.
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.TP
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.B -n, --no-cleanmarkers
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Do not write \'CLEANMARKER\' nodes to the beginning of each erase
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block. This option can be useful for creating JFFS2 images for
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use on NAND flash, and for creating images which are to be used
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on a variety of hardware with differing eraseblock sizes.
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.TP
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.B -o, --output=FILE
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Write JFFS2 image to file FILE. Default is the standard output.
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.TP
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.B -l, --little-endian
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Create a little-endian JFFS2 image. Default is to make an image
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with the same endianness as the host.
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.TP
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.B -b, --big-endian
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Create a big-endian JFFS2 image. Default is to make an image
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with the same endianness as the host.
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.TP
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.B -D, --devtable=FILE
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Use the named FILE as a device table file, for including devices and
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changing permissions in the created image when the user does not have
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appropriate permissions to create them on the file system used as
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source.
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.TP
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.B -f, --faketime
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Change all file timestamps to \'0\' for regression testing.
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.TP
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.B -q, --squash
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Squash permissions and owners, making all files be owned by root and
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removing write permission for \'group\' and \'other\'.
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.TP
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.B -U, --squash-uids
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Squash owners making all files be owned by root.
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.TP
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.B -P, --squash-perms
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Squash permissions, removing write permission for \'group\' and \'other\'.
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.TP
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.B --with-xattr
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Enables xattr, stuff all xattr entries into jffs2 image file.
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.TP
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.B --with-selinux
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Enables xattr, stuff only SELinux Labels into jffs2 image file.
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.TP
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.B --with-posix-acl
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Enable xattr, stuff only POSIX ACL entries into jffs2 image file.
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.TP
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.B -m, --compression-mode=MODE
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Set the default compression mode. The default mode is
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.B priority
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which tries the compressors in a predefinied order and chooses the first
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successful one. The alternatives are:
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.B none
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(mkfs will not compress) and
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.B size
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(mkfs will try all compressor and chooses the one which have the smallest result).
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.TP
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.B -x, --disable-compressor=NAME
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Disable a compressor. Use
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.B -L
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to see the list of the avaiable compressors and their default states.
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.TP
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.B -X, --enable-compressor=NAME
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Enable a compressor. Use
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.B -L
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to see the list of the avaiable compressors and their default states.
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.TP
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.B -y, --compressor-priority=PRIORITY:NAME
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Set the priority of a compressor. Use
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.B -L
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to see the list of the avaiable compressors and their default priority.
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Priorities are used by priority compression mode.
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.TP
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.B -L, --list-compressors
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Show the list of the avaiable compressors and their states.
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.TP
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.B -t, --test-compression
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Call decompress after every compress - and compare the result with the original data -, and
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some other check.
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.TP
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.B -h, --help
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Display help text.
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.TP
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.B -v, --verbose
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Verbose operation.
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.TP
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.B -V, --version
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Display version information.
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.TP
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.B -i, --incremental=FILE
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Generate an appendage image for FILE. If FILE is written to flash and flash
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is appended with the output, then it seems as if it was one thing.
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.SH LIMITATIONS
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The format and grammar of the device table file does not allow it to
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create symbolic links when the symbolic links are not already present
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in the root working directory.
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However, symbolic links may be specified in the device table file
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using the \fIl\fR type for the purposes of setting their permissions
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and ownership.
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.SH BUGS
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JFFS2 limits device major and minor numbers to 8 bits each. Some
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consider this a bug.
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.B mkfs.jffs2
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does not properly handle hard links in the input directory structure.
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Currently, hard linked files will be expanded to multiple identical
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files in the output image.
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.SH AUTHORS
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David Woodhouse
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.br
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Manual page written by David Schleef <ds@schleef.org>
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.SH SEE ALSO
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.BR mkfs (8),
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.BR mkfs.jffs (1),
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.BR fakeroot (1)
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