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 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 29config SQUASHFS_XATTRS 30 bool "Squashfs XATTR support" 31 depends on SQUASHFS 32 default n 33 help 34 Saying Y here includes support for extended attributes (xattrs). 35 Xattrs are name:value pairs associated with inodes by 36 the kernel or by users (see the attr(5) manual page). 37 38 If unsure, say N. 39 40config SQUASHFS_EMBEDDED 41 42 bool "Additional option for memory-constrained systems" 43 depends on SQUASHFS 44 default n 45 help 46 Saying Y here allows you to specify cache size. 47 48 If unsure, say N. 49 50config SQUASHFS_FRAGMENT_CACHE_SIZE 51 int "Number of fragments cached" if SQUASHFS_EMBEDDED 52 depends on SQUASHFS 53 default "3" 54 help 55 By default SquashFS caches the last 3 fragments read from 56 the filesystem. Increasing this amount may mean SquashFS 57 has to re-read fragments less often from disk, at the expense 58 of extra system memory. Decreasing this amount will mean 59 SquashFS uses less memory at the expense of extra reads from disk. 60 61 Note there must be at least one cached fragment. Anything 62 much more than three will probably not make much difference. 63