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gerrit-public.fairphone.software / kernel / msm-4.19 / 9687b89d21999301ed386855c04b60d00ed1ec02 / . / block / Kconfig
blob: 4a85ccf8d4cfca02daab96709e35cc14a92a35b5 [file] [log] [blame]
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]1#
2# Block layer core configuration
3#
Jan Engelhardt16ed0022007-07-10 12:24:11 +0200[diff] [blame]4menuconfig BLOCK
David Rientjes6a108a12011-01-20 14:44:16 -0800[diff] [blame]5 bool "Enable the block layer" if EXPERT
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]6 default y
Oleg Nesterov22b361d2012-12-17 16:01:39 -0800[diff] [blame]7 select PERCPU_RWSEM
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]8 help
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]9 Provide block layer support for the kernel.
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]10
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]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.
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]21
22 Say Y here unless you know you really don't want to mount disks and
23 suchlike.
24
25if BLOCK
26
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +0200[diff] [blame]27config LBDAF
28 bool "Support for large (2TB+) block devices and files"
Matthew Wilcoxe6243862006-12-04 03:38:31 -0700[diff] [blame]29 depends on !64BIT
Bartlomiej Zolnierkiewiczdb29a6b2009-04-21 09:27:03 +0200[diff] [blame]30 default y
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]31 help
Jens Axboeb3a6ffe2008-12-12 09:51:16 +0100[diff] [blame]32 Enable block devices or files of size 2TB and larger.
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]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.
Jens Axboeb3a6ffe2008-12-12 09:51:16 +0100[diff] [blame]37
38 This option also enables support for single files larger than
39 2TB.
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]40
Theodore Ts'o4d783b02009-01-06 15:16:33 -0500[diff] [blame]41 The ext4 filesystem requires that this feature be enabled in
42 order to support filesystems that have the huge_file feature
Bartlomiej Zolnierkiewiczdb29a6b2009-04-21 09:27:03 +0200[diff] [blame]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.
Theodore Ts'o4d783b02009-01-06 15:16:33 -0500[diff] [blame]46
Bartlomiej Zolnierkiewiczdb29a6b2009-04-21 09:27:03 +0200[diff] [blame]47 The GFS2 filesystem also requires this feature.
48
49 If unsure, say Y.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]50
Jens Axboe3d6392c2007-07-09 12:38:05 +0200[diff] [blame]51config BLK_DEV_BSG
John Stoffel14d9fa32009-08-04 22:10:17 +0200[diff] [blame]52 bool "Block layer SG support v4"
53 default y
54 help
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]55 Saying Y here will enable generic SG (SCSI generic) v4 support
56 for any block device.
FUJITA Tomonori319a7b72007-07-17 12:22:09 +0200[diff] [blame]57
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]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
John Stoffel14d9fa32009-08-04 22:10:17 +0200[diff] [blame]64 This option is required by recent UDEV versions to properly
65 access device serial numbers, etc.
66
67 If unsure, say Y.
Jens Axboe3d6392c2007-07-09 12:38:05 +0200[diff] [blame]68
Mike Christieaa387cc2011-07-31 22:05:09 +0200[diff] [blame]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
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200[diff] [blame]79config BLK_DEV_INTEGRITY
80 bool "Block layer data integrity support"
81 ---help---
82 Some storage devices allow extra information to be
83 stored/retrieved to help protect the data. The block layer
84 data integrity option provides hooks which can be used by
85 filesystems to ensure better data integrity.
86
87 Say yes here if you have a storage device that provides the
88 T10/SCSI Data Integrity Field or the T13/ATA External Path
89 Protection. If in doubt, say N.
90
Vivek Goyale43473b2010-09-15 17:06:35 -0400[diff] [blame]91config BLK_DEV_THROTTLING
92 bool "Block layer bio throttling support"
Kees Cook8e42e0a2012-10-23 13:01:46 -0700[diff] [blame]93 depends on BLK_CGROUP=y
Vivek Goyale43473b2010-09-15 17:06:35 -0400[diff] [blame]94 default n
95 ---help---
96 Block layer bio throttling support. It can be used to limit
97 the IO rate to a device. IO rate policies are per cgroup and
98 one needs to mount and use blkio cgroup controller for creating
99 cgroups and specifying per device IO rate policies.
100
101 See Documentation/cgroups/blkio-controller.txt for more information.
102
Al Viro9be96f32011-09-16 00:25:05 -0400[diff] [blame]103menu "Partition Types"
104
105source "block/partitions/Kconfig"
106
107endmenu
108
Linus Torvalds2b9e0aa2007-10-12 17:58:36 -0700[diff] [blame]109endif # BLOCK
110
Jens Axboe99874d52007-10-12 12:50:41 +0200[diff] [blame]111config BLOCK_COMPAT
112 bool
Linus Torvalds2b9e0aa2007-10-12 17:58:36 -0700[diff] [blame]113 depends on BLOCK && COMPAT
Jens Axboe99874d52007-10-12 12:50:41 +0200[diff] [blame]114 default y
115
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]116source block/Kconfig.iosched