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Diffstat (limited to 'fs/squashfs/Kconfig')
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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. | ||