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Kconfig

Kconfig 2.0 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_EMBEDDED
    30. 

  30. 

  31. 	bool "Additional option for memory-constrained systems" 
    32. 

  32. 	depends on SQUASHFS
    33. 

  33. 	default n
    34. 

  34. 	help
    35. 

  35. 	  Saying Y here allows you to specify cache size.
    36. 

  36. 

  37. 	  If unsure, say N.
    38. 

  38. 

  39. config SQUASHFS_FRAGMENT_CACHE_SIZE
    40. 

  40. 	int "Number of fragments cached" if SQUASHFS_EMBEDDED
    41. 

  41. 	depends on SQUASHFS
    42. 

  42. 	default "3"
    43. 

  43. 	help
    44. 

  44. 	  By default SquashFS caches the last 3 fragments read from
    45. 

  45. 	  the filesystem.  Increasing this amount may mean SquashFS
    46. 

  46. 	  has to re-read fragments less often from disk, at the expense
    47. 

  47. 	  of extra system memory.  Decreasing this amount will mean
    48. 

  48. 	  SquashFS uses less memory at the expense of extra reads from disk.
    49. 

  49. 

  50. 	  Note there must be at least one cached fragment.  Anything
    51. 

  51. 	  much more than three will probably not make much difference.
    52.