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1#
2# Block layer core configuration
3#
16ed002f 4menuconfig BLOCK
6a108a14 5 bool "Enable the block layer" if EXPERT
9361401e 6 default y
88459642 7 select SBITMAP
9361401e 8 help
ee86418d 9 Provide block layer support for the kernel.
9361401e 10
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NA
11 Disable this option to remove the block layer support from the
12 kernel. This may be useful for embedded devices.
13
14 If this option is disabled:
15
16 - block device files will become unusable
17 - some filesystems (such as ext3) will become unavailable.
18
19 Also, SCSI character devices and USB storage will be disabled since
20 they make use of various block layer definitions and facilities.
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21
22 Say Y here unless you know you really don't want to mount disks and
23 suchlike.
24
25if BLOCK
26
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27config LBDAF
28 bool "Support for large (2TB+) block devices and files"
e6243863 29 depends on !64BIT
db29a6b4 30 default y
3a65dfe8 31 help
b3a6ffe1 32 Enable block devices or files of size 2TB and larger.
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NA
33
34 This option is required to support the full capacity of large
35 (2TB+) block devices, including RAID, disk, Network Block Device,
36 Logical Volume Manager (LVM) and loopback.
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37
38 This option also enables support for single files larger than
39 2TB.
ee86418d 40
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41 The ext4 filesystem requires that this feature be enabled in
42 order to support filesystems that have the huge_file feature
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43 enabled. Otherwise, it will refuse to mount in the read-write
44 mode any filesystems that use the huge_file feature, which is
45 enabled by default by mke2fs.ext4.
4d783b09 46
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47 The GFS2 filesystem also requires this feature.
48
49 If unsure, say Y.
3a65dfe8 50
3d6392cf 51config BLK_DEV_BSG
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52 bool "Block layer SG support v4"
53 default y
54 help
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55 Saying Y here will enable generic SG (SCSI generic) v4 support
56 for any block device.
57
58 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
59 can handle complicated SCSI commands: tagged variable length cdbs
60 with bidirectional data transfers and generic request/response
61 protocols (e.g. Task Management Functions and SMP in Serial
62 Attached SCSI).
63
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64 This option is required by recent UDEV versions to properly
65 access device serial numbers, etc.
66
67 If unsure, say Y.
3d6392cf 68
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69config BLK_DEV_BSGLIB
70 bool "Block layer SG support v4 helper lib"
71 default n
72 select BLK_DEV_BSG
73 help
74 Subsystems will normally enable this if needed. Users will not
75 normally need to manually enable this.
76
77 If unsure, say N.
78
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79config BLK_DEV_INTEGRITY
80 bool "Block layer data integrity support"
2341c2f8 81 select CRC_T10DIF if BLK_DEV_INTEGRITY
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82 ---help---
83 Some storage devices allow extra information to be
84 stored/retrieved to help protect the data. The block layer
85 data integrity option provides hooks which can be used by
86 filesystems to ensure better data integrity.
87
88 Say yes here if you have a storage device that provides the
89 T10/SCSI Data Integrity Field or the T13/ATA External Path
90 Protection. If in doubt, say N.
91
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92config BLK_DEV_THROTTLING
93 bool "Block layer bio throttling support"
8e42e0a2 94 depends on BLK_CGROUP=y
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95 default n
96 ---help---
97 Block layer bio throttling support. It can be used to limit
98 the IO rate to a device. IO rate policies are per cgroup and
99 one needs to mount and use blkio cgroup controller for creating
100 cgroups and specifying per device IO rate policies.
101
102 See Documentation/cgroups/blkio-controller.txt for more information.
103
080506ad 104config BLK_CMDLINE_PARSER
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105 bool "Block device command line partition parser"
106 default n
107 ---help---
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108 Enabling this option allows you to specify the partition layout from
109 the kernel boot args. This is typically of use for embedded devices
110 which don't otherwise have any standardized method for listing the
111 partitions on a block device.
112
113 See Documentation/block/cmdline-partition.txt for more information.
bab55417 114
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115menu "Partition Types"
116
117source "block/partitions/Kconfig"
118
119endmenu
120
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121endif # BLOCK
122
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123config BLOCK_COMPAT
124 bool
2b9e0aae 125 depends on BLOCK && COMPAT
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126 default y
127
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128config BLK_MQ_PCI
129 bool
130 depends on BLOCK && PCI
131 default y
132
3a65dfe8 133source block/Kconfig.iosched