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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. |