1# SPDX-License-Identifier: GPL-2.0
  2#
  3# Block layer core configuration
  4#
  5menuconfig BLOCK
  6       bool "Enable the block layer" if EXPERT
  7       default y
  8       select SBITMAP
  9       help
 10	 Provide block layer support for the kernel.
 11
 12	 Disable this option to remove the block layer support from the
 13	 kernel. This may be useful for embedded devices.
 14
 15	 If this option is disabled:
 16
 17	   - block device files will become unusable
 18	   - some filesystems (such as ext3) will become unavailable.
 19
 20	 Also, SCSI character devices and USB storage will be disabled since
 21	 they make use of various block layer definitions and facilities.
 22
 23	 Say Y here unless you know you really don't want to mount disks and
 24	 suchlike.
 25
 26if BLOCK
 27
 28config BLOCK_LEGACY_AUTOLOAD
 29	bool "Legacy autoloading support"
 
 30	default y
 31	help
 32	  Enable loading modules and creating block device instances based on
 33	  accesses through their device special file.  This is a historic Linux
 34	  feature and makes no sense in a udev world where device files are
 35	  created on demand, but scripts that manually create device nodes and
 36	  then call losetup might rely on this behavior.
 37
 38config BLK_RQ_ALLOC_TIME
 39	bool
 
 
 
 
 
 
 
 
 
 
 40
 41config BLK_CGROUP_RWSTAT
 42	bool
 43
 44config BLK_DEV_BSG_COMMON
 45	tristate
 46
 47config BLK_ICQ
 48	bool
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 49
 50config BLK_DEV_BSGLIB
 51	bool "Block layer SG support v4 helper lib"
 52	select BLK_DEV_BSG_COMMON
 
 53	help
 54	  Subsystems will normally enable this if needed. Users will not
 55	  normally need to manually enable this.
 56
 57	  If unsure, say N.
 58
 59config BLK_DEV_INTEGRITY
 60	bool "Block layer data integrity support"
 61	help
 
 62	Some storage devices allow extra information to be
 63	stored/retrieved to help protect the data.  The block layer
 64	data integrity option provides hooks which can be used by
 65	filesystems to ensure better data integrity.
 66
 67	Say yes here if you have a storage device that provides the
 68	T10/SCSI Data Integrity Field or the T13/ATA External Path
 69	Protection.  If in doubt, say N.
 70
 71config BLK_DEV_INTEGRITY_T10
 72	tristate
 73	depends on BLK_DEV_INTEGRITY
 74	select CRC_T10DIF
 75	select CRC64_ROCKSOFT
 76
 77config BLK_DEV_ZONED
 78	bool "Zoned block device support"
 79	select MQ_IOSCHED_DEADLINE
 80	help
 81	Block layer zoned block device support. This option enables
 82	support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
 83	devices.
 84
 85	Say yes here if you have a ZAC, ZBC, or ZNS storage device.
 86
 87config BLK_DEV_THROTTLING
 88	bool "Block layer bio throttling support"
 89	depends on BLK_CGROUP
 90	select BLK_CGROUP_RWSTAT
 91	help
 92	Block layer bio throttling support. It can be used to limit
 93	the IO rate to a device. IO rate policies are per cgroup and
 94	one needs to mount and use blkio cgroup controller for creating
 95	cgroups and specifying per device IO rate policies.
 96
 97	See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
 98
 99config BLK_DEV_THROTTLING_LOW
100	bool "Block throttling .low limit interface support (EXPERIMENTAL)"
101	depends on BLK_DEV_THROTTLING
102	help
103	Add .low limit interface for block throttling. The low limit is a best
104	effort limit to prioritize cgroups. Depending on the setting, the limit
105	can be used to protect cgroups in terms of bandwidth/iops and better
106	utilize disk resource.
107
108	Note, this is an experimental interface and could be changed someday.
 
 
 
 
 
 
 
109
110config BLK_WBT
111	bool "Enable support for block device writeback throttling"
112	help
113	Enabling this option enables the block layer to throttle buffered
114	background writeback from the VM, making it more smooth and having
115	less impact on foreground operations. The throttling is done
116	dynamically on an algorithm loosely based on CoDel, factoring in
117	the realtime performance of the disk.
118
119config BLK_WBT_MQ
120	bool "Enable writeback throttling by default"
121	default y
122	depends on BLK_WBT
123	help
124	Enable writeback throttling by default for request-based block devices.
125
126config BLK_CGROUP_IOLATENCY
127	bool "Enable support for latency based cgroup IO protection"
128	depends on BLK_CGROUP
129	help
130	Enabling this option enables the .latency interface for IO throttling.
131	The IO controller will attempt to maintain average IO latencies below
132	the configured latency target, throttling anybody with a higher latency
133	target than the victimized group.
134
135	Note, this is an experimental interface and could be changed someday.
136
137config BLK_CGROUP_FC_APPID
138	bool "Enable support to track FC I/O Traffic across cgroup applications"
139	depends on BLK_CGROUP && NVME_FC
140	help
141	  Enabling this option enables the support to track FC I/O traffic across
142	  cgroup applications. It enables the Fabric and the storage targets to
143	  identify, monitor, and handle FC traffic based on VM tags by inserting
144	  application specific identification into the FC frame.
145
146config BLK_CGROUP_IOCOST
147	bool "Enable support for cost model based cgroup IO controller"
148	depends on BLK_CGROUP
149	select BLK_RQ_ALLOC_TIME
150	help
151	Enabling this option enables the .weight interface for cost
152	model based proportional IO control.  The IO controller
153	distributes IO capacity between different groups based on
154	their share of the overall weight distribution.
155
156config BLK_CGROUP_IOPRIO
157	bool "Cgroup I/O controller for assigning an I/O priority class"
158	depends on BLK_CGROUP
159	help
160	Enable the .prio interface for assigning an I/O priority class to
161	requests. The I/O priority class affects the order in which an I/O
162	scheduler and block devices process requests. Only some I/O schedulers
163	and some block devices support I/O priorities.
164
165config BLK_DEBUG_FS
166	bool "Block layer debugging information in debugfs"
167	default y
168	depends on DEBUG_FS
169	help
170	Include block layer debugging information in debugfs. This information
171	is mostly useful for kernel developers, but it doesn't incur any cost
172	at runtime.
173
174	Unless you are building a kernel for a tiny system, you should
175	say Y here.
176
177config BLK_DEBUG_FS_ZONED
178       bool
179       default BLK_DEBUG_FS && BLK_DEV_ZONED
180
181config BLK_SED_OPAL
182	bool "Logic for interfacing with Opal enabled SEDs"
183	help
184	Builds Logic for interfacing with Opal enabled controllers.
185	Enabling this option enables users to setup/unlock/lock
186	Locking ranges for SED devices using the Opal protocol.
187
188config BLK_INLINE_ENCRYPTION
189	bool "Enable inline encryption support in block layer"
190	help
191	  Build the blk-crypto subsystem. Enabling this lets the
192	  block layer handle encryption, so users can take
193	  advantage of inline encryption hardware if present.
194
195config BLK_INLINE_ENCRYPTION_FALLBACK
196	bool "Enable crypto API fallback for blk-crypto"
197	depends on BLK_INLINE_ENCRYPTION
198	select CRYPTO
199	select CRYPTO_SKCIPHER
200	help
201	  Enabling this lets the block layer handle inline encryption
202	  by falling back to the kernel crypto API when inline
203	  encryption hardware is not present.
204
205source "block/partitions/Kconfig"
206
207config BLOCK_COMPAT
208	def_bool COMPAT
209
210config BLK_MQ_PCI
211	def_bool PCI
212
213config BLK_MQ_VIRTIO
214	bool
215	depends on VIRTIO
216	default y
217
218config BLK_MQ_RDMA
219	bool
220	depends on INFINIBAND
221	default y
222
223config BLK_PM
224	def_bool PM
225
226# do not use in new code
227config BLOCK_HOLDER_DEPRECATED
228	bool
229
230config BLK_MQ_STACKING
231	bool
232
233source "block/Kconfig.iosched"
234
235endif # BLOCK

 
  1#
  2# Block layer core configuration
  3#
  4menuconfig BLOCK
  5       bool "Enable the block layer" if EXPERT
  6       default y
 
  7       help
  8	 Provide block layer support for the kernel.
  9
 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.
 20
 21	 Say Y here unless you know you really don't want to mount disks and
 22	 suchlike.
 23
 24if BLOCK
 25
 26config LBDAF
 27	bool "Support for large (2TB+) block devices and files"
 28	depends on !64BIT
 29	default y
 30	help
 31	  Enable block devices or files of size 2TB and larger.
 
 
 
 
 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.
 36	
 37	  This option also enables support for single files larger than
 38	  2TB.
 39
 40	  The ext4 filesystem requires that this feature be enabled in
 41	  order to support filesystems that have the huge_file feature
 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.
 45
 46	  The GFS2 filesystem also requires this feature.
 
 47
 48	  If unsure, say Y.
 
 49
 50config BLK_DEV_BSG
 51	bool "Block layer SG support v4"
 52	default y
 53	help
 54	  Saying Y here will enable generic SG (SCSI generic) v4 support
 55	  for any block device.
 56
 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
 63	  This option is required by recent UDEV versions to properly
 64	  access device serial numbers, etc.
 65
 66	  If unsure, say Y.
 67
 68config 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
 78config BLK_DEV_INTEGRITY
 79	bool "Block layer data integrity support"
 80	select CRC_T10DIF if BLK_DEV_INTEGRITY
 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
 91config 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
104config BLK_DEV_THROTTLING
105	bool "Block layer bio throttling support"
106	depends on BLK_CGROUP=y
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
116config BLK_CMDLINE_PARSER
117	bool "Block device command line partition parser"
118	default n
119	---help---
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.
 
 
 
 
 
 
 
126
127menu "Partition Types"
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
128
129source "block/partitions/Kconfig"
130
131endmenu
 
132
133endif # BLOCK
 
 
 
 
 
 
134
135config BLOCK_COMPAT
136	bool
137	depends on BLOCK && COMPAT
138	default y
139
140source block/Kconfig.iosched