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Squashfs: update Kconfig and documentation for LZO

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Update compression types supported and add some help text for
the LZO Kconfig option.

Also add missing "default n" line and make some trivial whitespace
cleanups too.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
This commit is contained in:
Phillip Lougher 2010-08-05 23:42:54 +01:00
parent f3065f60dd
commit 4b676d2dbe
2 changed files with 15 additions and 5 deletions
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2
Documentation/filesystems/squashfs.txt
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@ -2,7 +2,7 @@ SQUASHFS 4.0 FILESYSTEM
======================= =======================
Squashfs is a compressed read-only filesystem for Linux. Squashfs is a compressed read-only filesystem for Linux.
It uses zlib compression to compress files, inodes and directories. It uses zlib/lzo compression to compress files, inodes and directories.
Inodes in the system are very small and all blocks are packed to minimise 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 data overhead. Block sizes greater than 4K are supported up to a maximum
of 1Mbytes (default block size 128K). of 1Mbytes (default block size 128K).

18
fs/squashfs/Kconfig
View file

@ -5,13 +5,13 @@ config SQUASHFS
help help
Saying Y here includes support for SquashFS 4.0 (a Compressed Saying Y here includes support for SquashFS 4.0 (a Compressed
Read-Only File System). Squashfs is a highly compressed read-only Read-Only File System). Squashfs is a highly compressed read-only
filesystem for Linux. It uses zlib compression to compress both filesystem for Linux. It uses zlib/lzo compression to compress both
files, inodes and directories. Inodes in the system are very small files, inodes and directories. Inodes in the system are very small
and all blocks are packed to minimise data overhead. Block sizes and all blocks are packed to minimise data overhead. Block sizes
greater than 4K are supported up to a maximum of 1 Mbytes (default 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 block size 128K). SquashFS 4.0 supports 64 bit filesystems and files
(larger than 4GB), full uid/gid information, hard links and (larger than 4GB), full uid/gid information, hard links and
timestamps. timestamps.
Squashfs is intended for general read-only filesystem use, for 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 archival use (i.e. in cases where a .tar.gz file may be used), and in
@ -40,11 +40,21 @@ config SQUASHFS_XATTR
config SQUASHFS_LZO config SQUASHFS_LZO
bool "Include support for LZO compressed file systems" bool "Include support for LZO compressed file systems"
depends on SQUASHFS depends on SQUASHFS
default n
select LZO_DECOMPRESS select LZO_DECOMPRESS
help
Saying Y here includes support for reading Squashfs file systems
compressed with LZO compresssion. LZO compression is mainly
aimed at embedded systems with slower CPUs where the overheads
of zlib are too high.
LZO is not the standard compression used in Squashfs and so most
file systems will be readable without selecting this option.
If unsure, say N.
config SQUASHFS_EMBEDDED config SQUASHFS_EMBEDDED
bool "Additional option for memory-constrained systems"
bool "Additional option for memory-constrained systems"
depends on SQUASHFS depends on SQUASHFS
default n default n
help help