1config 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, lzo or xz compression to
9	  compress both files, inodes and directories.  Inodes in the system
10	  are very small and all blocks are packed to minimise data overhead.
11	  Block sizes greater than 4K are supported up to a maximum of 1 Mbytes
12	  (default block size 128K).  SquashFS 4.0 supports 64 bit filesystems
13	  and files (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
29config SQUASHFS_XATTR
30	bool "Squashfs XATTR support"
31	depends on SQUASHFS
32	help
33	  Saying Y here includes support for extended attributes (xattrs).
34	  Xattrs are name:value pairs associated with inodes by
35	  the kernel or by users (see the attr(5) manual page).
36
37	  If unsure, say N.
38
39config SQUASHFS_LZO
40	bool "Include support for LZO compressed file systems"
41	depends on SQUASHFS
42	select LZO_DECOMPRESS
43	help
44	  Saying Y here includes support for reading Squashfs file systems
45	  compressed with LZO compresssion.  LZO compression is mainly
46	  aimed at embedded systems with slower CPUs where the overheads
47	  of zlib are too high.
48
49	  LZO is not the standard compression used in Squashfs and so most
50	  file systems will be readable without selecting this option.
51
52	  If unsure, say N.
53
54config SQUASHFS_XZ
55	bool "Include support for XZ compressed file systems"
56	depends on SQUASHFS
57	select XZ_DEC
58	help
59	  Saying Y here includes support for reading Squashfs file systems
60	  compressed with XZ compresssion.  XZ gives better compression than
61	  the default zlib compression, at the expense of greater CPU and
62	  memory overhead.
63
64	  XZ is not the standard compression used in Squashfs and so most
65	  file systems will be readable without selecting this option.
66
67	  If unsure, say N.
68
69config SQUASHFS_EMBEDDED
70	bool "Additional option for memory-constrained systems"
71	depends on SQUASHFS
72	help
73	  Saying Y here allows you to specify cache size.
74
75	  If unsure, say N.
76
77config SQUASHFS_FRAGMENT_CACHE_SIZE
78	int "Number of fragments cached" if SQUASHFS_EMBEDDED
79	depends on SQUASHFS
80	default "3"
81	help
82	  By default SquashFS caches the last 3 fragments read from
83	  the filesystem.  Increasing this amount may mean SquashFS
84	  has to re-read fragments less often from disk, at the expense
85	  of extra system memory.  Decreasing this amount will mean
86	  SquashFS uses less memory at the expense of extra reads from disk.
87
88	  Note there must be at least one cached fragment.  Anything
89	  much more than three will probably not make much difference.
90