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yaml --- r: 130019 b: refs/heads/master c: 22635ec h: refs/heads/master i: 130017: 4e1ff53 130015: a2c7227 v: v3
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Alexey Dobriyan
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Jan 22, 2009
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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. | ||
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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. | ||
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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. | ||
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If unsure, say N. | ||
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config SQUASHFS_EMBEDDED | ||
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bool "Additional option for memory-constrained systems" | ||
depends on SQUASHFS | ||
default n | ||
help | ||
Saying Y here allows you to specify cache size. | ||
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If unsure, say N. | ||
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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. | ||
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Note there must be at least one cached fragment. Anything | ||
much more than three will probably not make much difference. |