[linux-2.6-block.git] / fs / squashfs / Kconfig

config SQUASHFS
	tristate "SquashFS 4.0 - Squashed file system support"
	depends on BLOCK
	select ZLIB_INFLATE
	help
	  Saying Y here includes support for SquashFS 4.0 (a Compressed
	  Read-Only File System).  Squashfs is a highly compressed read-only
	  filesystem for Linux.  It uses zlib compression to compress both
	  files, inodes and directories.  Inodes in the system are very small
	  and all blocks are packed to minimise data overhead. Block sizes
	  greater than 4K are supported up to a maximum of 1 Mbytes (default
	  block size 128K).  SquashFS 4.0 supports 64 bit filesystems and files
	  (larger than 4GB), full uid/gid information, hard links and
	  timestamps.  

	  Squashfs is intended for general read-only filesystem use, for
	  archival use (i.e. in cases where a .tar.gz file may be used), and in
	  embedded systems where low overhead is needed.  Further information
	  and tools are available from http://squashfs.sourceforge.net.

	  If you want to compile this as a module ( = code which can be
	  inserted in and removed from the running kernel whenever you want),
	  say M here and read <file:Documentation/modules.txt>.  The module
	  will be called squashfs.  Note that the root file system (the one
	  containing the directory /) cannot be compiled as a module.

	  If unsure, say N.

config SQUASHFS_EMBEDDED

	bool "Additional option for memory-constrained systems" 
	depends on SQUASHFS
	default n
	help
	  Saying Y here allows you to specify cache size.

	  If unsure, say N.

config SQUASHFS_FRAGMENT_CACHE_SIZE
	int "Number of fragments cached" if SQUASHFS_EMBEDDED
	depends on SQUASHFS
	default "3"
	help
	  By default SquashFS caches the last 3 fragments read from
	  the filesystem.  Increasing this amount may mean SquashFS
	  has to re-read fragments less often from disk, at the expense
	  of extra system memory.  Decreasing this amount will mean
	  SquashFS uses less memory at the expense of extra reads from disk.

	  Note there must be at least one cached fragment.  Anything
	  much more than three will probably not make much difference.
Commit	Line	Data
22635ec9 AD	1	config SQUASHFS
	2	tristate "SquashFS 4.0 - Squashed file system support"
	3	depends on BLOCK
	4	select ZLIB_INFLATE
	5	help
	6	Saying Y here includes support for SquashFS 4.0 (a Compressed
	7	Read-Only File System). Squashfs is a highly compressed read-only
	8	filesystem for Linux. It uses zlib compression to compress both
	9	files, inodes and directories. Inodes in the system are very small
	10	and all blocks are packed to minimise data overhead. Block sizes
	11	greater than 4K are supported up to a maximum of 1 Mbytes (default
	12	block size 128K). SquashFS 4.0 supports 64 bit filesystems and files
	13	(larger than 4GB), full uid/gid information, hard links and
	14	timestamps.
	15
	16	Squashfs is intended for general read-only filesystem use, for
	17	archival use (i.e. in cases where a .tar.gz file may be used), and in
	18	embedded systems where low overhead is needed. Further information
	19	and tools are available from http://squashfs.sourceforge.net.
	20
	21	If you want to compile this as a module ( = code which can be
	22	inserted in and removed from the running kernel whenever you want),
	23	say M here and read <file:Documentation/modules.txt>. The module
	24	will be called squashfs. Note that the root file system (the one
	25	containing the directory /) cannot be compiled as a module.
	26
	27	If unsure, say N.
	28
	29	config SQUASHFS_EMBEDDED
	30
	31	bool "Additional option for memory-constrained systems"
	32	depends on SQUASHFS
	33	default n
	34	help
	35	Saying Y here allows you to specify cache size.
	36
	37	If unsure, say N.
	38
	39	config SQUASHFS_FRAGMENT_CACHE_SIZE
	40	int "Number of fragments cached" if SQUASHFS_EMBEDDED
	41	depends on SQUASHFS
	42	default "3"
	43	help
	44	By default SquashFS caches the last 3 fragments read from
	45	the filesystem. Increasing this amount may mean SquashFS
	46	has to re-read fragments less often from disk, at the expense
	47	of extra system memory. Decreasing this amount will mean
	48	SquashFS uses less memory at the expense of extra reads from disk.
	49
	50	Note there must be at least one cached fragment. Anything
	51	much more than three will probably not make much difference.