Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) # SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) config SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 	tristate "SquashFS 4.0 - Squashed file system support"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) 	depends on BLOCK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 	  Saying Y here includes support for SquashFS 4.0 (a Compressed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 	  Read-Only File System).  Squashfs is a highly compressed read-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 	  filesystem for Linux.  It uses zlib, lzo or xz compression to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 	  compress both files, inodes and directories.  Inodes in the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 	  are very small and all blocks are packed to minimise data overhead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 	  Block sizes greater than 4K are supported up to a maximum of 1 Mbytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 	  (default block size 128K).  SquashFS 4.0 supports 64 bit filesystems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 	  and files (larger than 4GB), full uid/gid information, hard links and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 	  timestamps.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	  Squashfs is intended for general read-only filesystem use, for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	  archival use (i.e. in cases where a .tar.gz file may be used), and in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	  embedded systems where low overhead is needed.  Further information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	  and tools are available from http://squashfs.sourceforge.net.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	  If you want to compile this as a module ( = code which can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	  inserted in and removed from the running kernel whenever you want),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	  say M here.  The module will be called squashfs.  Note that the root
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	  file system (the one containing the directory /) cannot be compiled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	  as a module.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) choice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	prompt "File decompression options"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	  Squashfs now supports two options for decompressing file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	  data.  Traditionally Squashfs has decompressed into an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	  intermediate buffer and then memcopied it into the page cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	  Squashfs now supports the ability to decompress directly into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	  the page cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	  If unsure, select "Decompress file data into an intermediate buffer"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) config SQUASHFS_FILE_CACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	bool "Decompress file data into an intermediate buffer"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	  Decompress file data into an intermediate buffer and then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	  memcopy it into the page cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) config SQUASHFS_FILE_DIRECT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	bool "Decompress files directly into the page cache"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	  Directly decompress file data into the page cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	  Doing so can significantly improve performance because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	  it eliminates a memcpy and it also removes the lock contention
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	  on the single buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) endchoice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) choice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	prompt "Decompressor parallelisation options"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	  Squashfs now supports three parallelisation options for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	  decompression.  Each one exhibits various trade-offs between
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	  decompression performance and CPU and memory usage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	  If in doubt, select "Single threaded compression"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) config SQUASHFS_DECOMP_SINGLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	bool "Single threaded compression"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	  Traditionally Squashfs has used single-threaded decompression.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	  Only one block (data or metadata) can be decompressed at any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	  one time.  This limits CPU and memory usage to a minimum.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) config SQUASHFS_DECOMP_MULTI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	bool "Use multiple decompressors for parallel I/O"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	  By default Squashfs uses a single decompressor but it gives
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	  poor performance on parallel I/O workloads when using multiple CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	  machines due to waiting on decompressor availability.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	  If you have a parallel I/O workload and your system has enough memory,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	  using this option may improve overall I/O performance.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	  This decompressor implementation uses up to two parallel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	  decompressors per core.  It dynamically allocates decompressors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	  on a demand basis.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) config SQUASHFS_DECOMP_MULTI_PERCPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	bool "Use percpu multiple decompressors for parallel I/O"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	  By default Squashfs uses a single decompressor but it gives
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	  poor performance on parallel I/O workloads when using multiple CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	  machines due to waiting on decompressor availability.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	  This decompressor implementation uses a maximum of one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	  decompressor per core.  It uses percpu variables to ensure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	  decompression is load-balanced across the cores.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) endchoice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) config SQUASHFS_XATTR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	bool "Squashfs XATTR support"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	  Saying Y here includes support for extended attributes (xattrs).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	  Xattrs are name:value pairs associated with inodes by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	  the kernel or by users (see the attr(5) manual page).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) config SQUASHFS_ZLIB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	bool "Include support for ZLIB compressed file systems"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	select ZLIB_INFLATE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	default y
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	  ZLIB compression is the standard compression used by Squashfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	  file systems.  It offers a good trade-off between compression
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	  achieved and the amount of CPU time and memory necessary to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	  compress and decompress.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	  If unsure, say Y.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) config SQUASHFS_LZ4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	bool "Include support for LZ4 compressed file systems"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	select LZ4_DECOMPRESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	  Saying Y here includes support for reading Squashfs file systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	  compressed with LZ4 compression.  LZ4 compression is mainly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	  aimed at embedded systems with slower CPUs where the overheads
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	  of zlib are too high.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	  LZ4 is not the standard compression used in Squashfs and so most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	  file systems will be readable without selecting this option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) config SQUASHFS_LZO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	bool "Include support for LZO compressed file systems"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	select LZO_DECOMPRESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	  Saying Y here includes support for reading Squashfs file systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	  compressed with LZO compression.  LZO compression is mainly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	  aimed at embedded systems with slower CPUs where the overheads
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	  of zlib are too high.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	  LZO is not the standard compression used in Squashfs and so most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	  file systems will be readable without selecting this option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) config SQUASHFS_XZ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	bool "Include support for XZ compressed file systems"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	select XZ_DEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	  Saying Y here includes support for reading Squashfs file systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	  compressed with XZ compression.  XZ gives better compression than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	  the default zlib compression, at the expense of greater CPU and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	  memory overhead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	  XZ is not the standard compression used in Squashfs and so most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	  file systems will be readable without selecting this option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) config SQUASHFS_ZSTD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	bool "Include support for ZSTD compressed file systems"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	select ZSTD_DECOMPRESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	  Saying Y here includes support for reading Squashfs file systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	  compressed with ZSTD compression.  ZSTD gives better compression than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	  the default ZLIB compression, while using less CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	  ZSTD is not the standard compression used in Squashfs and so most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	  file systems will be readable without selecting this option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) config SQUASHFS_4K_DEVBLK_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	bool "Use 4K device block size?"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	  By default Squashfs sets the dev block size (sb_min_blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	  to 1K or the smallest block size supported by the block device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	  (if larger).  This, because blocks are packed together and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	  unaligned in Squashfs, should reduce latency.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	  This, however, gives poor performance on MTD NAND devices where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	  the optimal I/O size is 4K (even though the devices can support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	  smaller block sizes).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	  Using a 4K device block size may also improve overall I/O
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	  performance for some file access patterns (e.g. sequential
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	  accesses of files in filesystem order) on all media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	  Setting this option will force Squashfs to use a 4K device block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	  size by default.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) config SQUASHFS_EMBEDDED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	bool "Additional option for memory-constrained systems"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	  Saying Y here allows you to specify cache size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	  If unsure, say N.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) config SQUASHFS_FRAGMENT_CACHE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	int "Number of fragments cached" if SQUASHFS_EMBEDDED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	depends on SQUASHFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	default "3"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	  By default SquashFS caches the last 3 fragments read from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	  the filesystem.  Increasing this amount may mean SquashFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	  has to re-read fragments less often from disk, at the expense
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	  of extra system memory.  Decreasing this amount will mean
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	  SquashFS uses less memory at the expense of extra reads from disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	  Note there must be at least one cached fragment.  Anything
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	  much more than three will probably not make much difference.