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. 52