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+config SQUASHFS
+ tristate "SquashFS 4.0 - Squashed file system support"
+ depends on BLOCK
+ 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, lzo or xz 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. 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_XATTR
+ bool "Squashfs XATTR support"
+ depends on SQUASHFS
+ 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_ZLIB
+ bool "Include support for ZLIB compressed file systems"
+ depends on SQUASHFS
+ select ZLIB_INFLATE
+ default y
+ help
+ ZLIB compression is the standard compression used by Squashfs
+ file systems. It offers a good trade-off between compression
+ achieved and the amount of CPU time and memory necessary to
+ compress and decompress.
+
+ If unsure, say Y.
+
+config SQUASHFS_LZO
+ bool "Include support for LZO compressed file systems"
+ depends on SQUASHFS
+ select LZO_DECOMPRESS
+ help
+ Saying Y here includes support for reading Squashfs file systems
+ compressed with LZO compression. 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_XZ
+ bool "Include support for XZ compressed file systems"
+ depends on SQUASHFS
+ select XZ_DEC
+ help
+ Saying Y here includes support for reading Squashfs file systems
+ compressed with XZ compression. XZ gives better compression than
+ the default zlib compression, at the expense of greater CPU and
+ memory overhead.
+
+ XZ 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_4K_DEVBLK_SIZE
+ bool "Use 4K device block size?"
+ depends on SQUASHFS
+ help
+ By default Squashfs sets the dev block size (sb_min_blocksize)
+ to 1K or the smallest block size supported by the block device
+ (if larger). This, because blocks are packed together and
+ unaligned in Squashfs, should reduce latency.
+
+ This, however, gives poor performance on MTD NAND devices where
+ the optimal I/O size is 4K (even though the devices can support
+ smaller block sizes).
+
+ Using a 4K device block size may also improve overall I/O
+ performance for some file access patterns (e.g. sequential
+ accesses of files in filesystem order) on all media.
+
+ Setting this option will force Squashfs to use a 4K device block
+ size by default.
+
+ If unsure, say N.
+
+config SQUASHFS_EMBEDDED
+ bool "Additional option for memory-constrained systems"
+ depends on SQUASHFS
+ 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.