Kconfig 4.16 KB
Newer Older
1 2 3
#
# Block layer core configuration
#
4
menuconfig BLOCK
5
       bool "Enable the block layer" if EXPERT
6 7
       default y
       help
8
	 Provide block layer support for the kernel.
9

10 11 12 13 14 15 16 17 18 19
	 Disable this option to remove the block layer support from the
	 kernel. This may be useful for embedded devices.

	 If this option is disabled:

	   - block device files will become unusable
	   - some filesystems (such as ext3) will become unavailable.

	 Also, SCSI character devices and USB storage will be disabled since
	 they make use of various block layer definitions and facilities.
20 21 22 23 24 25

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

if BLOCK

26 27
config LBDAF
	bool "Support for large (2TB+) block devices and files"
28
	depends on !64BIT
29
	default y
30
	help
Jens Axboe's avatar
Jens Axboe committed
31
	  Enable block devices or files of size 2TB and larger.
32 33 34 35

	  This option is required to support the full capacity of large
	  (2TB+) block devices, including RAID, disk, Network Block Device,
	  Logical Volume Manager (LVM) and loopback.
Jens Axboe's avatar
Jens Axboe committed
36 37 38
	
	  This option also enables support for single files larger than
	  2TB.
39

40 41
	  The ext4 filesystem requires that this feature be enabled in
	  order to support filesystems that have the huge_file feature
42 43 44
	  enabled.  Otherwise, it will refuse to mount in the read-write
	  mode any filesystems that use the huge_file feature, which is
	  enabled by default by mke2fs.ext4.
45

46 47 48
	  The GFS2 filesystem also requires this feature.

	  If unsure, say Y.
49

50
config BLK_DEV_BSG
51 52 53
	bool "Block layer SG support v4"
	default y
	help
54 55 56 57 58 59 60 61 62
	  Saying Y here will enable generic SG (SCSI generic) v4 support
	  for any block device.

	  Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
	  can handle complicated SCSI commands: tagged variable length cdbs
	  with bidirectional data transfers and generic request/response
	  protocols (e.g. Task Management Functions and SMP in Serial
	  Attached SCSI).

63 64 65 66
	  This option is required by recent UDEV versions to properly
	  access device serial numbers, etc.

	  If unsure, say Y.
67

68 69 70 71 72 73 74 75 76 77
config BLK_DEV_BSGLIB
	bool "Block layer SG support v4 helper lib"
	default n
	select BLK_DEV_BSG
	help
	  Subsystems will normally enable this if needed. Users will not
	  normally need to manually enable this.

	  If unsure, say N.

78 79
config BLK_DEV_INTEGRITY
	bool "Block layer data integrity support"
80
	select CRC_T10DIF if BLK_DEV_INTEGRITY
81 82 83 84 85 86 87 88 89
	---help---
	Some storage devices allow extra information to be
	stored/retrieved to help protect the data.  The block layer
	data integrity option provides hooks which can be used by
	filesystems to ensure better data integrity.

	Say yes here if you have a storage device that provides the
	T10/SCSI Data Integrity Field or the T13/ATA External Path
	Protection.  If in doubt, say N.
90 91 92 93 94 95 96 97 98 99 100 101 102

config BLK_DEV_DAX
	bool "Block device DAX support"
	depends on FS_DAX
	depends on BROKEN
	help
	  When DAX support is available (CONFIG_FS_DAX) raw block
	  devices can also support direct userspace access to the
	  storage capacity via MMAP(2) similar to a file on a
	  DAX-enabled filesystem.  However, the DAX I/O-path disables
	  some standard I/O-statistics, and the MMAP(2) path has some
	  operational differences due to bypassing the page
	  cache.  If in doubt, say N.
103

104 105
config BLK_DEV_THROTTLING
	bool "Block layer bio throttling support"
106
	depends on BLK_CGROUP=y
107 108 109 110 111 112 113 114 115
	default n
	---help---
	Block layer bio throttling support. It can be used to limit
	the IO rate to a device. IO rate policies are per cgroup and
	one needs to mount and use blkio cgroup controller for creating
	cgroups and specifying per device IO rate policies.

	See Documentation/cgroups/blkio-controller.txt for more information.

116
config BLK_CMDLINE_PARSER
117 118 119
	bool "Block device command line partition parser"
	default n
	---help---
120 121 122 123 124 125
	Enabling this option allows you to specify the partition layout from
	the kernel boot args.  This is typically of use for embedded devices
	which don't otherwise have any standardized method for listing the
	partitions on a block device.

	See Documentation/block/cmdline-partition.txt for more information.
126

Al Viro's avatar
Al Viro committed
127 128 129 130 131 132
menu "Partition Types"

source "block/partitions/Kconfig"

endmenu

133 134
endif # BLOCK

135 136
config BLOCK_COMPAT
	bool
137
	depends on BLOCK && COMPAT
138 139
	default y

140
source block/Kconfig.iosched