xref: /linux/block/Kconfig (revision 6a83e74d214a47a1371cd2e6a783264fcba7d428)
13a65dfe8SJens Axboe#
23a65dfe8SJens Axboe# Block layer core configuration
33a65dfe8SJens Axboe#
416ed002fSJan Engelhardtmenuconfig BLOCK
56a108a14SDavid Rientjes       bool "Enable the block layer" if EXPERT
69361401eSDavid Howells       default y
788459642SOmar Sandoval       select SBITMAP
8*6a83e74dSBart Van Assche       select SRCU
99361401eSDavid Howells       help
10ee86418dSNick Andrew	 Provide block layer support for the kernel.
119361401eSDavid Howells
12ee86418dSNick Andrew	 Disable this option to remove the block layer support from the
13ee86418dSNick Andrew	 kernel. This may be useful for embedded devices.
14ee86418dSNick Andrew
15ee86418dSNick Andrew	 If this option is disabled:
16ee86418dSNick Andrew
17ee86418dSNick Andrew	   - block device files will become unusable
18ee86418dSNick Andrew	   - some filesystems (such as ext3) will become unavailable.
19ee86418dSNick Andrew
20ee86418dSNick Andrew	 Also, SCSI character devices and USB storage will be disabled since
21ee86418dSNick Andrew	 they make use of various block layer definitions and facilities.
229361401eSDavid Howells
239361401eSDavid Howells	 Say Y here unless you know you really don't want to mount disks and
249361401eSDavid Howells	 suchlike.
259361401eSDavid Howells
269361401eSDavid Howellsif BLOCK
279361401eSDavid Howells
2890c699a9SBartlomiej Zolnierkiewiczconfig LBDAF
2990c699a9SBartlomiej Zolnierkiewicz	bool "Support for large (2TB+) block devices and files"
30e6243863SMatthew Wilcox	depends on !64BIT
31db29a6b4SBartlomiej Zolnierkiewicz	default y
323a65dfe8SJens Axboe	help
33b3a6ffe1SJens Axboe	  Enable block devices or files of size 2TB and larger.
34ee86418dSNick Andrew
35ee86418dSNick Andrew	  This option is required to support the full capacity of large
36ee86418dSNick Andrew	  (2TB+) block devices, including RAID, disk, Network Block Device,
37ee86418dSNick Andrew	  Logical Volume Manager (LVM) and loopback.
38ee86418dSNick Andrew
39b3a6ffe1SJens Axboe	  This option also enables support for single files larger than
40b3a6ffe1SJens Axboe	  2TB.
41ee86418dSNick Andrew
424d783b09STheodore Ts'o	  The ext4 filesystem requires that this feature be enabled in
434d783b09STheodore Ts'o	  order to support filesystems that have the huge_file feature
44db29a6b4SBartlomiej Zolnierkiewicz	  enabled.  Otherwise, it will refuse to mount in the read-write
45db29a6b4SBartlomiej Zolnierkiewicz	  mode any filesystems that use the huge_file feature, which is
46db29a6b4SBartlomiej Zolnierkiewicz	  enabled by default by mke2fs.ext4.
474d783b09STheodore Ts'o
48db29a6b4SBartlomiej Zolnierkiewicz	  The GFS2 filesystem also requires this feature.
49db29a6b4SBartlomiej Zolnierkiewicz
50db29a6b4SBartlomiej Zolnierkiewicz	  If unsure, say Y.
513a65dfe8SJens Axboe
523d6392cfSJens Axboeconfig BLK_DEV_BSG
5314d9fa35SJohn Stoffel	bool "Block layer SG support v4"
5414d9fa35SJohn Stoffel	default y
5514d9fa35SJohn Stoffel	help
56319a7b7fSFUJITA Tomonori	  Saying Y here will enable generic SG (SCSI generic) v4 support
57319a7b7fSFUJITA Tomonori	  for any block device.
58319a7b7fSFUJITA Tomonori
59319a7b7fSFUJITA Tomonori	  Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
60319a7b7fSFUJITA Tomonori	  can handle complicated SCSI commands: tagged variable length cdbs
61319a7b7fSFUJITA Tomonori	  with bidirectional data transfers and generic request/response
62319a7b7fSFUJITA Tomonori	  protocols (e.g. Task Management Functions and SMP in Serial
63319a7b7fSFUJITA Tomonori	  Attached SCSI).
643d6392cfSJens Axboe
6514d9fa35SJohn Stoffel	  This option is required by recent UDEV versions to properly
6614d9fa35SJohn Stoffel	  access device serial numbers, etc.
6714d9fa35SJohn Stoffel
6814d9fa35SJohn Stoffel	  If unsure, say Y.
69ee86418dSNick Andrew
70aa387cc8SMike Christieconfig BLK_DEV_BSGLIB
71aa387cc8SMike Christie	bool "Block layer SG support v4 helper lib"
72aa387cc8SMike Christie	default n
73aa387cc8SMike Christie	select BLK_DEV_BSG
74aa387cc8SMike Christie	help
75aa387cc8SMike Christie	  Subsystems will normally enable this if needed. Users will not
76aa387cc8SMike Christie	  normally need to manually enable this.
77aa387cc8SMike Christie
78aa387cc8SMike Christie	  If unsure, say N.
79aa387cc8SMike Christie
807ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY
817ba1ba12SMartin K. Petersen	bool "Block layer data integrity support"
822341c2f8SMartin K. Petersen	select CRC_T10DIF if BLK_DEV_INTEGRITY
837ba1ba12SMartin K. Petersen	---help---
847ba1ba12SMartin K. Petersen	Some storage devices allow extra information to be
857ba1ba12SMartin K. Petersen	stored/retrieved to help protect the data.  The block layer
867ba1ba12SMartin K. Petersen	data integrity option provides hooks which can be used by
877ba1ba12SMartin K. Petersen	filesystems to ensure better data integrity.
887ba1ba12SMartin K. Petersen
897ba1ba12SMartin K. Petersen	Say yes here if you have a storage device that provides the
907ba1ba12SMartin K. Petersen	T10/SCSI Data Integrity Field or the T13/ATA External Path
917ba1ba12SMartin K. Petersen	Protection.  If in doubt, say N.
927ba1ba12SMartin K. Petersen
936a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED
946a0cb1bcSHannes Reinecke	bool "Zoned block device support"
956a0cb1bcSHannes Reinecke	---help---
966a0cb1bcSHannes Reinecke	Block layer zoned block device support. This option enables
976a0cb1bcSHannes Reinecke	support for ZAC/ZBC host-managed and host-aware zoned block devices.
986a0cb1bcSHannes Reinecke
996a0cb1bcSHannes Reinecke	Say yes here if you have a ZAC or ZBC storage device.
1006a0cb1bcSHannes Reinecke
101e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING
102e43473b7SVivek Goyal	bool "Block layer bio throttling support"
1038e42e0a2SKees Cook	depends on BLK_CGROUP=y
104e43473b7SVivek Goyal	default n
105e43473b7SVivek Goyal	---help---
106e43473b7SVivek Goyal	Block layer bio throttling support. It can be used to limit
107e43473b7SVivek Goyal	the IO rate to a device. IO rate policies are per cgroup and
108e43473b7SVivek Goyal	one needs to mount and use blkio cgroup controller for creating
109e43473b7SVivek Goyal	cgroups and specifying per device IO rate policies.
110e43473b7SVivek Goyal
111e43473b7SVivek Goyal	See Documentation/cgroups/blkio-controller.txt for more information.
112e43473b7SVivek Goyal
113080506adSPaul Gortmakerconfig BLK_CMDLINE_PARSER
114bab55417SCai Zhiyong	bool "Block device command line partition parser"
115bab55417SCai Zhiyong	default n
116bab55417SCai Zhiyong	---help---
117080506adSPaul Gortmaker	Enabling this option allows you to specify the partition layout from
118080506adSPaul Gortmaker	the kernel boot args.  This is typically of use for embedded devices
119080506adSPaul Gortmaker	which don't otherwise have any standardized method for listing the
120080506adSPaul Gortmaker	partitions on a block device.
121080506adSPaul Gortmaker
122080506adSPaul Gortmaker	See Documentation/block/cmdline-partition.txt for more information.
123bab55417SCai Zhiyong
1249be96f3fSAl Viromenu "Partition Types"
1259be96f3fSAl Viro
1269be96f3fSAl Virosource "block/partitions/Kconfig"
1279be96f3fSAl Viro
1289be96f3fSAl Viroendmenu
1299be96f3fSAl Viro
1302b9e0aaeSLinus Torvaldsendif # BLOCK
1312b9e0aaeSLinus Torvalds
13299874d50SJens Axboeconfig BLOCK_COMPAT
13399874d50SJens Axboe	bool
1342b9e0aaeSLinus Torvalds	depends on BLOCK && COMPAT
13599874d50SJens Axboe	default y
13699874d50SJens Axboe
1378ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI
1388ec2ef2bSStephen Rothwell	bool
1398ec2ef2bSStephen Rothwell	depends on BLOCK && PCI
1408ec2ef2bSStephen Rothwell	default y
1418ec2ef2bSStephen Rothwell
1423a65dfe8SJens Axboesource block/Kconfig.iosched
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