mirror of
https://github.com/torvalds/linux.git
synced 2024-12-14 23:25:54 +00:00
52 lines
2.0 KiB
Plaintext
52 lines
2.0 KiB
Plaintext
|
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_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.
|