Blame - block/Kconfig - kernel/msm-4.9

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Jens Axboe	3a65dfe	2005-11-04 08:43:35 +0100	[diff] [blame]	1	#
				2	# Block layer core configuration
				3	#
Jan Engelhardt	16ed002	2007-07-10 12:24:11 +0200	[diff] [blame]	4	menuconfig BLOCK
David Rientjes	6a108a1	2011-01-20 14:44:16 -0800	[diff] [blame]	5	bool "Enable the block layer" if EXPERT
David Howells	9361401	2006-09-30 20:45:40 +0200	[diff] [blame]	6	default y
				7	help
Nick Andrew	ee86418	2008-04-21 09:51:04 +0200	[diff] [blame]	8	Provide block layer support for the kernel.
David Howells	9361401	2006-09-30 20:45:40 +0200	[diff] [blame]	9
Nick Andrew	ee86418	2008-04-21 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 Howells	9361401	2006-09-30 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
				24	if BLOCK
				25
Bartlomiej Zolnierkiewicz	90c699a	2009-06-19 08:08:50 +0200	[diff] [blame]	26	config LBDAF
				27	bool "Support for large (2TB+) block devices and files"
Matthew Wilcox	e624386	2006-12-04 03:38:31 -0700	[diff] [blame]	28	depends on !64BIT
Bartlomiej Zolnierkiewicz	db29a6b	2009-04-21 09:27:03 +0200	[diff] [blame]	29	default y
Jens Axboe	3a65dfe	2005-11-04 08:43:35 +0100	[diff] [blame]	30	help
Jens Axboe	b3a6ffe	2008-12-12 09:51:16 +0100	[diff] [blame]	31	Enable block devices or files of size 2TB and larger.
Nick Andrew	ee86418	2008-04-21 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 Axboe	b3a6ffe	2008-12-12 09:51:16 +0100	[diff] [blame]	36
				37	This option also enables support for single files larger than
				38	2TB.
Nick Andrew	ee86418	2008-04-21 09:51:04 +0200	[diff] [blame]	39
Theodore Ts'o	4d783b0	2009-01-06 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 Zolnierkiewicz	db29a6b	2009-04-21 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'o	4d783b0	2009-01-06 15:16:33 -0500	[diff] [blame]	45
Bartlomiej Zolnierkiewicz	db29a6b	2009-04-21 09:27:03 +0200	[diff] [blame]	46	The GFS2 filesystem also requires this feature.
				47
				48	If unsure, say Y.
Jens Axboe	3a65dfe	2005-11-04 08:43:35 +0100	[diff] [blame]	49
Jens Axboe	3d6392c	2007-07-09 12:38:05 +0200	[diff] [blame]	50	config BLK_DEV_BSG
John Stoffel	14d9fa3	2009-08-04 22:10:17 +0200	[diff] [blame]	51	bool "Block layer SG support v4"
				52	default y
				53	help
Nick Andrew	ee86418	2008-04-21 09:51:04 +0200	[diff] [blame]	54	Saying Y here will enable generic SG (SCSI generic) v4 support
				55	for any block device.
FUJITA Tomonori	319a7b7	2007-07-17 12:22:09 +0200	[diff] [blame]	56
Nick Andrew	ee86418	2008-04-21 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 Stoffel	14d9fa3	2009-08-04 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 Axboe	3d6392c	2007-07-09 12:38:05 +0200	[diff] [blame]	67
Mike Christie	aa387cc	2011-07-31 22:05:09 +0200	[diff] [blame]	68	config BLK_DEV_BSGLIB
				69	bool "Block layer SG support v4 helper lib"
				70	default n
				71	select BLK_DEV_BSG
				72	help
				73	Subsystems will normally enable this if needed. Users will not
				74	normally need to manually enable this.
				75
				76	If unsure, say N.
				77
Martin K. Petersen	7ba1ba1	2008-06-30 20:04:41 +0200	[diff] [blame]	78	config BLK_DEV_INTEGRITY
				79	bool "Block layer data integrity support"
Martin K. Petersen	2341c2f	2014-09-26 19:20:07 -0400	[diff] [blame]	80	select CRC_T10DIF if BLK_DEV_INTEGRITY
Martin K. Petersen	7ba1ba1	2008-06-30 20:04:41 +0200	[diff] [blame]	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
Dan Williams	03cdadb	2016-02-26 15:19:43 -0800	[diff] [blame]	91	config BLK_DEV_DAX
				92	bool "Block device DAX support"
				93	depends on FS_DAX
				94	depends on BROKEN
				95	help
				96	When DAX support is available (CONFIG_FS_DAX) raw block
				97	devices can also support direct userspace access to the
				98	storage capacity via MMAP(2) similar to a file on a
				99	DAX-enabled filesystem. However, the DAX I/O-path disables
				100	some standard I/O-statistics, and the MMAP(2) path has some
				101	operational differences due to bypassing the page
				102	cache. If in doubt, say N.
				103
Vivek Goyal	e43473b	2010-09-15 17:06:35 -0400	[diff] [blame]	104	config BLK_DEV_THROTTLING
				105	bool "Block layer bio throttling support"
Kees Cook	8e42e0a	2012-10-23 13:01:46 -0700	[diff] [blame]	106	depends on BLK_CGROUP=y
Vivek Goyal	e43473b	2010-09-15 17:06:35 -0400	[diff] [blame]	107	default n
				108	---help---
				109	Block layer bio throttling support. It can be used to limit
				110	the IO rate to a device. IO rate policies are per cgroup and
				111	one needs to mount and use blkio cgroup controller for creating
				112	cgroups and specifying per device IO rate policies.
				113
				114	See Documentation/cgroups/blkio-controller.txt for more information.
				115
Paul Gortmaker	080506a	2013-09-30 13:45:19 -0700	[diff] [blame]	116	config BLK_CMDLINE_PARSER
Cai Zhiyong	bab5541	2013-09-11 14:20:09 -0700	[diff] [blame]	117	bool "Block device command line partition parser"
				118	default n
				119	---help---
Paul Gortmaker	080506a	2013-09-30 13:45:19 -0700	[diff] [blame]	120	Enabling this option allows you to specify the partition layout from
				121	the kernel boot args. This is typically of use for embedded devices
				122	which don't otherwise have any standardized method for listing the
				123	partitions on a block device.
				124
				125	See Documentation/block/cmdline-partition.txt for more information.
Cai Zhiyong	bab5541	2013-09-11 14:20:09 -0700	[diff] [blame]	126
Al Viro	9be96f3	2011-09-16 00:25:05 -0400	[diff] [blame]	127	menu "Partition Types"
				128
				129	source "block/partitions/Kconfig"
				130
				131	endmenu
				132
Linus Torvalds	2b9e0aa	2007-10-12 17:58:36 -0700	[diff] [blame]	133	endif # BLOCK
				134
Jens Axboe	99874d5	2007-10-12 12:50:41 +0200	[diff] [blame]	135	config BLOCK_COMPAT
				136	bool
Linus Torvalds	2b9e0aa	2007-10-12 17:58:36 -0700	[diff] [blame]	137	depends on BLOCK && COMPAT
Jens Axboe	99874d5	2007-10-12 12:50:41 +0200	[diff] [blame]	138	default y
				139
Jens Axboe	3a65dfe	2005-11-04 08:43:35 +0100	[diff] [blame]	140	source block/Kconfig.iosched