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gerrit-public.fairphone.software / kernel / msm-4.9 / a61aac7cf1af1549d03cb8e7549c5427fabc6f5e / . / block / Kconfig
blob: f9e89f4d94bba17392f0416598d0ff7f27f92002 [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
Jens Axboe51d75132006-09-30 21:14:05 +0200[diff] [blame]5 bool "Enable the block layer" if EMBEDDED
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]6 default y
7 help
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]8 Provide block layer support for the kernel.
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]9
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]10 Disable this option to remove the block layer support from the
11 kernel. This may be useful for embedded devices.
12
13 If this option is disabled:
14
15 - block device files will become unusable
16 - some filesystems (such as ext3) will become unavailable.
17
18 Also, SCSI character devices and USB storage will be disabled since
19 they make use of various block layer definitions and facilities.
David Howells93614012006-09-30 20:45:40 +0200[diff] [blame]20
21 Say Y here unless you know you really don't want to mount disks and
22 suchlike.
23
24if BLOCK
25
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +0200[diff] [blame]26config LBDAF
27 bool "Support for large (2TB+) block devices and files"
Matthew Wilcoxe6243862006-12-04 03:38:31 -0700[diff] [blame]28 depends on !64BIT
Bartlomiej Zolnierkiewiczdb29a6b2009-04-21 09:27:03 +0200[diff] [blame]29 default y
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]30 help
Jens Axboeb3a6ffe2008-12-12 09:51:16 +0100[diff] [blame]31 Enable block devices or files of size 2TB and larger.
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]32
33 This option is required to support the full capacity of large
34 (2TB+) block devices, including RAID, disk, Network Block Device,
35 Logical Volume Manager (LVM) and loopback.
Jens Axboeb3a6ffe2008-12-12 09:51:16 +0100[diff] [blame]36
37 This option also enables support for single files larger than
38 2TB.
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]39
Theodore Ts'o4d783b02009-01-06 15:16:33 -0500[diff] [blame]40 The ext4 filesystem requires that this feature be enabled in
41 order to support filesystems that have the huge_file feature
Bartlomiej Zolnierkiewiczdb29a6b2009-04-21 09:27:03 +0200[diff] [blame]42 enabled. Otherwise, it will refuse to mount in the read-write
43 mode any filesystems that use the huge_file feature, which is
44 enabled by default by mke2fs.ext4.
Theodore Ts'o4d783b02009-01-06 15:16:33 -0500[diff] [blame]45
Bartlomiej Zolnierkiewiczdb29a6b2009-04-21 09:27:03 +0200[diff] [blame]46 The GFS2 filesystem also requires this feature.
47
48 If unsure, say Y.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]49
Jens Axboe3d6392c2007-07-09 12:38:05 +0200[diff] [blame]50config BLK_DEV_BSG
John Stoffel14d9fa32009-08-04 22:10:17 +0200[diff] [blame]51 bool "Block layer SG support v4"
52 default y
53 help
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]54 Saying Y here will enable generic SG (SCSI generic) v4 support
55 for any block device.
FUJITA Tomonori319a7b72007-07-17 12:22:09 +0200[diff] [blame]56
Nick Andrewee864182008-04-21 09:51:04 +0200[diff] [blame]57 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
58 can handle complicated SCSI commands: tagged variable length cdbs
59 with bidirectional data transfers and generic request/response
60 protocols (e.g. Task Management Functions and SMP in Serial
61 Attached SCSI).
62
John Stoffel14d9fa32009-08-04 22:10:17 +0200[diff] [blame]63 This option is required by recent UDEV versions to properly
64 access device serial numbers, etc.
65
66 If unsure, say Y.
Jens Axboe3d6392c2007-07-09 12:38:05 +0200[diff] [blame]67
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200[diff] [blame]68config BLK_DEV_INTEGRITY
69 bool "Block layer data integrity support"
70 ---help---
71 Some storage devices allow extra information to be
72 stored/retrieved to help protect the data. The block layer
73 data integrity option provides hooks which can be used by
74 filesystems to ensure better data integrity.
75
76 Say yes here if you have a storage device that provides the
77 T10/SCSI Data Integrity Field or the T13/ATA External Path
78 Protection. If in doubt, say N.
79
Vivek Goyal31e4c282009-12-03 12:59:42 -0500[diff] [blame]80config BLK_CGROUP
Li Zefan910ac732010-03-16 08:57:15 +0100[diff] [blame]81 tristate "Block cgroup support"
Vivek Goyal31e4c282009-12-03 12:59:42 -0500[diff] [blame]82 depends on CGROUPS
Li Zefan910ac732010-03-16 08:57:15 +0100[diff] [blame]83 depends on CFQ_GROUP_IOSCHED
Vivek Goyal31e4c282009-12-03 12:59:42 -0500[diff] [blame]84 default n
85 ---help---
86 Generic block IO controller cgroup interface. This is the common
87 cgroup interface which should be used by various IO controlling
88 policies.
89
90 Currently, CFQ IO scheduler uses it to recognize task groups and
91 control disk bandwidth allocation (proportional time slice allocation)
92 to such task groups.
93
Vivek Goyal2868ef72009-12-03 12:59:48 -0500[diff] [blame]94config DEBUG_BLK_CGROUP
95 bool
96 depends on BLK_CGROUP
97 default n
98 ---help---
99 Enable some debugging help. Currently it stores the cgroup path
100 in the blk group which can be used by cfq for tracing various
101 group related activity.
102
Linus Torvalds2b9e0aa2007-10-12 17:58:36 -0700[diff] [blame]103endif # BLOCK
104
Jens Axboe99874d52007-10-12 12:50:41 +0200[diff] [blame]105config BLOCK_COMPAT
106 bool
Linus Torvalds2b9e0aa2007-10-12 17:58:36 -0700[diff] [blame]107 depends on BLOCK && COMPAT
Jens Axboe99874d52007-10-12 12:50:41 +0200[diff] [blame]108 default y
109
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100[diff] [blame]110source block/Kconfig.iosched