1 # SPDX-License-Identifier: GPL-2.0
3 # Block layer core configuration
6 bool "Enable the block layer" if EXPERT
11 Provide block layer support for the kernel.
13 Disable this option to remove the block layer support from the
14 kernel. This may be useful for embedded devices.
16 If this option is disabled:
18 - block device files will become unusable
19 - some filesystems (such as ext3) will become unavailable.
21 Also, SCSI character devices and USB storage will be disabled since
22 they make use of various block layer definitions and facilities.
24 Say Y here unless you know you really don't want to mount disks and
29 config BLOCK_LEGACY_AUTOLOAD
30 bool "Legacy autoloading support"
33 Enable loading modules and creating block device instances based on
34 accesses through their device special file. This is a historic Linux
35 feature and makes no sense in a udev world where device files are
36 created on demand, but scripts that manually create device nodes and
37 then call losetup might rely on this behavior.
39 config BLK_RQ_ALLOC_TIME
42 config BLK_CGROUP_RWSTAT
45 config BLK_CGROUP_PUNT_BIO
48 config BLK_DEV_BSG_COMMON
55 bool "Block layer SG support v4 helper lib"
56 select BLK_DEV_BSG_COMMON
58 Subsystems will normally enable this if needed. Users will not
59 normally need to manually enable this.
63 config BLK_DEV_INTEGRITY
64 bool "Block layer data integrity support"
66 Some storage devices allow extra information to be
67 stored/retrieved to help protect the data. The block layer
68 data integrity option provides hooks which can be used by
69 filesystems to ensure better data integrity.
71 Say yes here if you have a storage device that provides the
72 T10/SCSI Data Integrity Field or the T13/ATA External Path
73 Protection. If in doubt, say N.
75 config BLK_DEV_INTEGRITY_T10
77 depends on BLK_DEV_INTEGRITY
82 bool "Zoned block device support"
83 select MQ_IOSCHED_DEADLINE
85 Block layer zoned block device support. This option enables
86 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
89 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
91 config BLK_DEV_THROTTLING
92 bool "Block layer bio throttling support"
94 select BLK_CGROUP_RWSTAT
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.
101 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
103 config BLK_DEV_THROTTLING_LOW
104 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
105 depends on BLK_DEV_THROTTLING
107 Add .low limit interface for block throttling. The low limit is a best
108 effort limit to prioritize cgroups. Depending on the setting, the limit
109 can be used to protect cgroups in terms of bandwidth/iops and better
110 utilize disk resource.
112 Note, this is an experimental interface and could be changed someday.
115 bool "Enable support for block device writeback throttling"
117 Enabling this option enables the block layer to throttle buffered
118 background writeback from the VM, making it more smooth and having
119 less impact on foreground operations. The throttling is done
120 dynamically on an algorithm loosely based on CoDel, factoring in
121 the realtime performance of the disk.
124 bool "Enable writeback throttling by default"
128 Enable writeback throttling by default for request-based block devices.
130 config BLK_CGROUP_IOLATENCY
131 bool "Enable support for latency based cgroup IO protection"
132 depends on BLK_CGROUP
134 Enabling this option enables the .latency interface for IO throttling.
135 The IO controller will attempt to maintain average IO latencies below
136 the configured latency target, throttling anybody with a higher latency
137 target than the victimized group.
139 Note, this is an experimental interface and could be changed someday.
141 config BLK_CGROUP_FC_APPID
142 bool "Enable support to track FC I/O Traffic across cgroup applications"
143 depends on BLK_CGROUP && NVME_FC
145 Enabling this option enables the support to track FC I/O traffic across
146 cgroup applications. It enables the Fabric and the storage targets to
147 identify, monitor, and handle FC traffic based on VM tags by inserting
148 application specific identification into the FC frame.
150 config BLK_CGROUP_IOCOST
151 bool "Enable support for cost model based cgroup IO controller"
152 depends on BLK_CGROUP
153 select BLK_RQ_ALLOC_TIME
155 Enabling this option enables the .weight interface for cost
156 model based proportional IO control. The IO controller
157 distributes IO capacity between different groups based on
158 their share of the overall weight distribution.
160 config BLK_CGROUP_IOPRIO
161 bool "Cgroup I/O controller for assigning an I/O priority class"
162 depends on BLK_CGROUP
164 Enable the .prio interface for assigning an I/O priority class to
165 requests. The I/O priority class affects the order in which an I/O
166 scheduler and block devices process requests. Only some I/O schedulers
167 and some block devices support I/O priorities.
170 bool "Block layer debugging information in debugfs"
174 Include block layer debugging information in debugfs. This information
175 is mostly useful for kernel developers, but it doesn't incur any cost
178 Unless you are building a kernel for a tiny system, you should
181 config BLK_DEBUG_FS_ZONED
183 default BLK_DEBUG_FS && BLK_DEV_ZONED
186 bool "Logic for interfacing with Opal enabled SEDs"
188 select PSERIES_PLPKS if PPC_PSERIES
190 Builds Logic for interfacing with Opal enabled controllers.
191 Enabling this option enables users to setup/unlock/lock
192 Locking ranges for SED devices using the Opal protocol.
194 config BLK_INLINE_ENCRYPTION
195 bool "Enable inline encryption support in block layer"
197 Build the blk-crypto subsystem. Enabling this lets the
198 block layer handle encryption, so users can take
199 advantage of inline encryption hardware if present.
201 config BLK_INLINE_ENCRYPTION_FALLBACK
202 bool "Enable crypto API fallback for blk-crypto"
203 depends on BLK_INLINE_ENCRYPTION
205 select CRYPTO_SKCIPHER
207 Enabling this lets the block layer handle inline encryption
208 by falling back to the kernel crypto API when inline
209 encryption hardware is not present.
211 source "block/partitions/Kconfig"
224 # do not use in new code
225 config BLOCK_HOLDER_DEPRECATED
228 config BLK_MQ_STACKING
231 source "block/Kconfig.iosched"