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Kconfig

Kconfig 2.4 KB
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  1. config SQUASHFS
    2. 

  2. 	tristate "SquashFS 4.0 - Squashed file system support"
    3. 

  3. 	depends on BLOCK
    4. 

  4. 	select ZLIB_INFLATE
    5. 

  5. 	help
    6. 

  6. 	  Saying Y here includes support for SquashFS 4.0 (a Compressed
    7. 

  7. 	  Read-Only File System).  Squashfs is a highly compressed read-only
    8. 

  8. 	  filesystem for Linux.  It uses zlib compression to compress both
    9. 

  9. 	  files, inodes and directories.  Inodes in the system are very small
    10. 

  10. 	  and all blocks are packed to minimise data overhead. Block sizes
    11. 

  11. 	  greater than 4K are supported up to a maximum of 1 Mbytes (default
    12. 

  12. 	  block size 128K).  SquashFS 4.0 supports 64 bit filesystems and files
    13. 

  13. 	  (larger than 4GB), full uid/gid information, hard links and
    14. 

  14. 	  timestamps.  
    15. 

  15. 

  16. 	  Squashfs is intended for general read-only filesystem use, for
    17. 

  17. 	  archival use (i.e. in cases where a .tar.gz file may be used), and in
    18. 

  18. 	  embedded systems where low overhead is needed.  Further information
    19. 

  19. 	  and tools are available from http://squashfs.sourceforge.net.
    20. 

  20. 

  21. 	  If you want to compile this as a module ( = code which can be
    22. 

  22. 	  inserted in and removed from the running kernel whenever you want),
    23. 

  23. 	  say M here and read <file:Documentation/modules.txt>.  The module
    24. 

  24. 	  will be called squashfs.  Note that the root file system (the one
    25. 

  25. 	  containing the directory /) cannot be compiled as a module.
    26. 

  26. 

  27. 	  If unsure, say N.
    28. 

  28. 

  29. config SQUASHFS_XATTR
    30. 

  30. 	bool "Squashfs XATTR support"
    31. 

  31. 	depends on SQUASHFS
    32. 

  32. 	default n
    33. 

  33. 	help
    34. 

  34. 	  Saying Y here includes support for extended attributes (xattrs).
    35. 

  35. 	  Xattrs are name:value pairs associated with inodes by
    36. 

  36. 	  the kernel or by users (see the attr(5) manual page).
    37. 

  37. 

  38. 	  If unsure, say N.
    39. 

  39. 

  40. config SQUASHFS_LZO
    41. 

  41. 	bool "Include support for LZO compressed file systems"
    42. 

  42. 	depends on SQUASHFS
    43. 

  43. 	select LZO_DECOMPRESS
    44. 

  44. 

  45. config SQUASHFS_EMBEDDED
    46. 

  46. 

  47. 	bool "Additional option for memory-constrained systems" 
    48. 

  48. 	depends on SQUASHFS
    49. 

  49. 	default n
    50. 

  50. 	help
    51. 

  51. 	  Saying Y here allows you to specify cache size.
    52. 

  52. 

  53. 	  If unsure, say N.
    54. 

  54. 

  55. config SQUASHFS_FRAGMENT_CACHE_SIZE
    56. 

  56. 	int "Number of fragments cached" if SQUASHFS_EMBEDDED
    57. 

  57. 	depends on SQUASHFS
    58. 

  58. 	default "3"
    59. 

  59. 	help
    60. 

  60. 	  By default SquashFS caches the last 3 fragments read from
    61. 

  61. 	  the filesystem.  Increasing this amount may mean SquashFS
    62. 

  62. 	  has to re-read fragments less often from disk, at the expense
    63. 

  63. 	  of extra system memory.  Decreasing this amount will mean
    64. 

  64. 	  SquashFS uses less memory at the expense of extra reads from disk.
    65. 

  65. 

  66. 	  Note there must be at least one cached fragment.  Anything
    67. 

  67. 	  much more than three will probably not make much difference.
    68.