| config SQUASHFS |
| tristate "SquashFS 4.0 - Squashed file system support" |
| depends on BLOCK |
| select ZLIB_INFLATE |
| help |
| Saying Y here includes support for SquashFS 4.0 (a Compressed |
| Read-Only File System). Squashfs is a highly compressed read-only |
| filesystem for Linux. It uses zlib compression to compress both |
| files, inodes and directories. Inodes in the system are very small |
| and all blocks are packed to minimise data overhead. Block sizes |
| greater than 4K are supported up to a maximum of 1 Mbytes (default |
| block size 128K). SquashFS 4.0 supports 64 bit filesystems and files |
| (larger than 4GB), full uid/gid information, hard links and |
| timestamps. |
| |
| Squashfs is intended for general read-only filesystem use, for |
| archival use (i.e. in cases where a .tar.gz file may be used), and in |
| embedded systems where low overhead is needed. Further information |
| and tools are available from http://squashfs.sourceforge.net. |
| |
| If you want to compile this as a module ( = code which can be |
| inserted in and removed from the running kernel whenever you want), |
| say M here and read <file:Documentation/modules.txt>. The module |
| will be called squashfs. Note that the root file system (the one |
| containing the directory /) cannot be compiled as a module. |
| |
| If unsure, say N. |
| |
| config SQUASHFS_XATTRS |
| bool "Squashfs XATTR support" |
| depends on SQUASHFS |
| default n |
| help |
| Saying Y here includes support for extended attributes (xattrs). |
| Xattrs are name:value pairs associated with inodes by |
| the kernel or by users (see the attr(5) manual page). |
| |
| If unsure, say N. |
| |
| config SQUASHFS_EMBEDDED |
| |
| bool "Additional option for memory-constrained systems" |
| depends on SQUASHFS |
| default n |
| help |
| Saying Y here allows you to specify cache size. |
| |
| If unsure, say N. |
| |
| config SQUASHFS_FRAGMENT_CACHE_SIZE |
| int "Number of fragments cached" if SQUASHFS_EMBEDDED |
| depends on SQUASHFS |
| default "3" |
| help |
| By default SquashFS caches the last 3 fragments read from |
| the filesystem. Increasing this amount may mean SquashFS |
| has to re-read fragments less often from disk, at the expense |
| of extra system memory. Decreasing this amount will mean |
| SquashFS uses less memory at the expense of extra reads from disk. |
| |
| Note there must be at least one cached fragment. Anything |
| much more than three will probably not make much difference. |
