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文章来自：http://blog.sina.com.cn/s/blog_4a4163880100cogf.html
mkfs.jffs2: Usage: mkfs.jffs2 [OPTIONS]
Make a JFFS2 file system image from an existing directory tree
Options:
-p, --pad[=SIZE]
-r, -d, --root=DIR
-s, --pagesize=SIZE
-e, --eraseblock=SIZE
-c, --cleanmarker=SIZE Size of cleanmarker (default 12)
-m, --compr-mode=MODE
-x, --disable-compressor=COMPRESSOR_NAME
-X, --enable-compressor=COMPRESSOR_NAME
-y, --compressor-priority=PRIORITY:COMPRESSOR_NAME
-L, --list-compressors Show the list of the avaiable compressors
-t, --test-compression Call decompress and compare with the original (fortest)
-n, --no-cleanmarkers
-o, --output=FILE
-l, --little-endian
-b, --big-endian
-D, --devtable=FILE
-f, --faketime
-q, --squash
-U, --squash-uids
-P, --squash-perms
-h, --help
-v, --verbose
-V, --version
-i, --incremental=FILE Parse FILE and generate appendage output for it
文章来自：http://blog.csdn.net/feihongwang/article/details/38750895
mkfs.jffs2(1)- Linux man page
mkfs.jffs2 - Create a JFFS2 file system image from directory
mkfs.jffs2 [ -p,--pad[=SIZE] ] [ -r,-d,--root directory ] [ -s,--pagesize=SIZE ] [ -e,--eraseblock=SIZE ] [ -c,--cleanmarker=SIZE ] [ -n,--no-cleanmarkers ] [ -o,--output image.jffs2 ] [ -l,--little-endian ] [ -b,--big-endian ] [ -D,--devtable=FILE ] [ -f,--faketime ] [ -q,--squash ] [ -U,--squash-uids ] [ -P,--squash-perms ] [--with-xattr ] [ --with-selinux ] [ --with-posix-acl ] [ -m,--compression-mode=MODE ] [ -x,--disable-compressor=NAME ] [ -X,--enable-compressor=NAME ] [ -y,--compressor-priority=PRIORITY:NAME ] [ -L,--list-compressors ] [ -t,--test-compression ] [ -h,--help ] [ -v,--verbose ] [ -V,--version ] [ -i,--incremental image.jffs2 ]
The program mkfs.jffs2 creates a JFFS2 (SecondJournalling Flash File System) file system image and writes the resulting imageto the file specified by the -o option or by default to the standard output, unless the standardoutput is a terminal device in which case mkfs.jffs2 will abort.
The file system image is createdusing the files and directories contained in the directory specified by theoption-r or the present directory, if the -r option is not specified.
Each block of the files to be placedinto the file system image are compressed using one of the avaiable compressorsdepending on the selected compression mode.
File systems are created with thesame endianness as the host, unless the -b or -l options are specified. JFFS2 driver in the 2.4 Linux kernel onlysupported images having the same endianness as the CPU. As of 2.5.48, thekernel can be changed with a #define to accept images of the non-nativeendianness. Full bi-endian support in the kernel is not planned.
It is unlikely that JFFS2 images areuseful except in conjuction with the MTD (Memory Technology Device) drivers inthe Linux kernel, since the JFFS2 file system driver in the kernel requires MTDdevices.
Options that take SIZE arguments canbe specified as either decimal (e.g., 65536), octal (0200000), or hexidecimal(0x1000).
-p, --pad[=SIZE]
Pad output to SIZE bytes with 0xFF. If SIZE is notspecified, the output is padded to the end of the final erase block.
-r, -d, --root=DIR
Build file system from directory DIR.The default is the current directory.
-s, --pagesize=SIZE
Use page size SIZE. The default is 4KiB. This size is the maximum size of a data node.
-e, --eraseblock=SIZE
Use erase block size SIZE. Thedefault is 64 KiB. If you use a erase block size different than the erase blocksize of the target MTD device, JFFS2 may not perform optimally. If the SIZEspecified is below 4096, the units are assumed to be KiB.
-c, --cleanmarker=SIZE
Write 'CLEANMARKER' nodes with thesize specified. It is not normally appropriate to specify a size other than thedefault 12 bytes.
-n, --no-cleanmarkers
Do not write 'CLEANMARKER' nodes tothe beginning of each erase block. This option can be useful for creating JFFS2images for use on NAND flash, and for creating images which are to be used on avariety of hardware with differing eraseblock sizes.
-o, --output=FILE
Write JFFS2 image to file FILE.Default is the standard output.
-l, --little-endian
Create a little-endian JFFS2 image.Default is to make an image with the same endianness as the host.
-b, --big-endian
Create a big-endian JFFS2 image.Default is to make an image with the same endianness as the host.
-D, --devtable=FILE
Use the named FILE as a device tablefile, for including devices and changing permissions in the created image whenthe user does not have appropriate permissions to create them on the filesystem used as source.
-f, --faketime
Change all file timestamps to '0' forregression testing.
-q, --squash
Squash permissions and owners, makingall files be owned by root and removing write permission for 'group' and'other'.
-U, --squash-uids
Squash owners making all files beowned by root.
-P, --squash-perms
Squash permissions, removing writepermission for 'group' and 'other'.
--with-xattr
Enables xattr, stuff all xattrentries into jffs2 image file.
--with-selinux
Enables xattr, stuff only SELinuxLabels into jffs2 image file.
--with-posix-acl
Enable xattr, stuff only POSIX ACLentries into jffs2 image file.
-m, --compression-mode=MODE
Set the default compression mode. Thedefault mode is priority which tries the compressors in a predefinied order and chooses thefirst successful one. The alternatives are: none (mkfs will not compress) and size (mkfs will try all compressorand chooses the one which have the smallest result).
-x, --disable-compressor=NAME
Disable a compressor. Use -L to see the list of the avaiablecompressors and their default states.
-X, --enable-compressor=NAME
Enable a compressor. Use -L to see the list of the avaiablecompressors and their default states.
-y, --compressor-priority=PRIORITY:NAME
Set the priority of a compressor.Use -L to see the list of the avaiable compressors and their defaultpriority. Priorities are used by priority compression mode.
-L, --list-compressors
Show the list of the avaiablecompressors and their states.
-t, --test-compression
Call decompress after every compress- and compare the result with the original data -, and some other check.
-h, --help
Display help text.
-v, --verbose
Verbose operation.
-V, --version
Display version information.
-i, --incremental=FILE
Generate an appendage image for FILE.If FILE is written to flash and flash is appended with the output, then itseems as if it was one thing.
JFFS2 limits device major and minornumbers to 8 bits each. Some consider this a bug.
mkfs.jffs2 does not properly handle hard links in the input directorystructure. Currently, hard linked files will be expanded to multiple identicalfiles in the output image.
David Woodhouse
Manual page written by David Schleef <ds@schleef.org>
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