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Kconfig

Kconfig 2.5 KB
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  1. #
    2. 

  2. # Block layer core configuration
    3. 

  3. #
    4. 

  4. menuconfig BLOCK
    5. 

  5.        bool "Enable the block layer" if EMBEDDED
    6. 

  6.        default y
    7. 

  7.        help
    8. 

  8. 	 Provide block layer support for the kernel.
    9. 

  9. 

  10. 	 Disable this option to remove the block layer support from the
    11. 

  11. 	 kernel. This may be useful for embedded devices.
    12. 

  12. 

  13. 	 If this option is disabled:
    14. 

  14. 

  15. 	   - block device files will become unusable
    16. 

  16. 	   - some filesystems (such as ext3) will become unavailable.
    17. 

  17. 

  18. 	 Also, SCSI character devices and USB storage will be disabled since
    19. 

  19. 	 they make use of various block layer definitions and facilities.
    20. 

  20. 

  21. 	 Say Y here unless you know you really don't want to mount disks and
    22. 

  22. 	 suchlike.
    23. 

  23. 

  24. if BLOCK
    25. 

  25. 

  26. config LBDAF
    27. 

  27. 	bool "Support for large (2TB+) block devices and files"
    28. 

  28. 	depends on !64BIT
    29. 

  29. 	default y
    30. 

  30. 	help
    31. 

  31. 	  Enable block devices or files of size 2TB and larger.
    32. 

  32. 

  33. 	  This option is required to support the full capacity of large
    34. 

  34. 	  (2TB+) block devices, including RAID, disk, Network Block Device,
    35. 

  35. 	  Logical Volume Manager (LVM) and loopback.
    36. 

  36. 	
    37. 

  37. 	  This option also enables support for single files larger than
    38. 

  38. 	  2TB.
    39. 

  39. 

  40. 	  The ext4 filesystem requires that this feature be enabled in
    41. 

  41. 	  order to support filesystems that have the huge_file feature
    42. 

  42. 	  enabled.  Otherwise, it will refuse to mount in the read-write
    43. 

  43. 	  mode any filesystems that use the huge_file feature, which is
    44. 

  44. 	  enabled by default by mke2fs.ext4.
    45. 

  45. 

  46. 	  The GFS2 filesystem also requires this feature.
    47. 

  47. 

  48. 	  If unsure, say Y.
    49. 

  49. 

  50. config BLK_DEV_BSG
    51. 

  51. 	bool "Block layer SG support v4 (EXPERIMENTAL)"
    52. 

  52. 	depends on EXPERIMENTAL
    53. 

  53. 	---help---
    54. 

  54. 	  Saying Y here will enable generic SG (SCSI generic) v4 support
    55. 

  55. 	  for any block device.
    56. 

  56. 

  57. 	  Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
    58. 

  58. 	  can handle complicated SCSI commands: tagged variable length cdbs
    59. 

  59. 	  with bidirectional data transfers and generic request/response
    60. 

  60. 	  protocols (e.g. Task Management Functions and SMP in Serial
    61. 

  61. 	  Attached SCSI).
    62. 

  62. 

  63. 	  If unsure, say N.
    64. 

  64. 

  65. config BLK_DEV_INTEGRITY
    66. 

  66. 	bool "Block layer data integrity support"
    67. 

  67. 	---help---
    68. 

  68. 	Some storage devices allow extra information to be
    69. 

  69. 	stored/retrieved to help protect the data.  The block layer
    70. 

  70. 	data integrity option provides hooks which can be used by
    71. 

  71. 	filesystems to ensure better data integrity.
    72. 

  72. 

  73. 	Say yes here if you have a storage device that provides the
    74. 

  74. 	T10/SCSI Data Integrity Field or the T13/ATA External Path
    75. 

  75. 	Protection.  If in doubt, say N.
    76. 

  76. 

  77. endif # BLOCK
    78. 

  78. 

  79. config BLOCK_COMPAT
    80. 

  80. 	bool
    81. 

  81. 	depends on BLOCK && COMPAT
    82. 

  82. 	default y
    83. 

  83. 

  84. source block/Kconfig.iosched
    85.