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_DEV_BSG_COMMON
52 bool "Block layer SG support v4 helper lib"
53 select BLK_DEV_BSG_COMMON
55 Subsystems will normally enable this if needed. Users will not
56 normally need to manually enable this.
60 config BLK_DEV_INTEGRITY
61 bool "Block layer data integrity support"
63 Some storage devices allow extra information to be
64 stored/retrieved to help protect the data. The block layer
65 data integrity option provides hooks which can be used by
66 filesystems to ensure better data integrity.
68 Say yes here if you have a storage device that provides the
69 T10/SCSI Data Integrity Field or the T13/ATA External Path
70 Protection. If in doubt, say N.
72 config BLK_DEV_INTEGRITY_T10
74 depends on BLK_DEV_INTEGRITY
79 bool "Zoned block device support"
80 select MQ_IOSCHED_DEADLINE
82 Block layer zoned block device support. This option enables
83 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
86 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
88 config BLK_DEV_THROTTLING
89 bool "Block layer bio throttling support"
91 select BLK_CGROUP_RWSTAT
93 Block layer bio throttling support. It can be used to limit
94 the IO rate to a device. IO rate policies are per cgroup and
95 one needs to mount and use blkio cgroup controller for creating
96 cgroups and specifying per device IO rate policies.
98 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
100 config BLK_DEV_THROTTLING_LOW
101 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
102 depends on BLK_DEV_THROTTLING
104 Add .low limit interface for block throttling. The low limit is a best
105 effort limit to prioritize cgroups. Depending on the setting, the limit
106 can be used to protect cgroups in terms of bandwidth/iops and better
107 utilize disk resource.
109 Note, this is an experimental interface and could be changed someday.
112 bool "Enable support for block device writeback throttling"
114 Enabling this option enables the block layer to throttle buffered
115 background writeback from the VM, making it more smooth and having
116 less impact on foreground operations. The throttling is done
117 dynamically on an algorithm loosely based on CoDel, factoring in
118 the realtime performance of the disk.
121 bool "Enable writeback throttling by default"
125 Enable writeback throttling by default for request-based block devices.
127 config BLK_CGROUP_IOLATENCY
128 bool "Enable support for latency based cgroup IO protection"
129 depends on BLK_CGROUP
131 Enabling this option enables the .latency interface for IO throttling.
132 The IO controller will attempt to maintain average IO latencies below
133 the configured latency target, throttling anybody with a higher latency
134 target than the victimized group.
136 Note, this is an experimental interface and could be changed someday.
138 config BLK_CGROUP_FC_APPID
139 bool "Enable support to track FC I/O Traffic across cgroup applications"
140 depends on BLK_CGROUP && NVME_FC
142 Enabling this option enables the support to track FC I/O traffic across
143 cgroup applications. It enables the Fabric and the storage targets to
144 identify, monitor, and handle FC traffic based on VM tags by inserting
145 application specific identification into the FC frame.
147 config BLK_CGROUP_IOCOST
148 bool "Enable support for cost model based cgroup IO controller"
149 depends on BLK_CGROUP
150 select BLK_RQ_IO_DATA_LEN
151 select BLK_RQ_ALLOC_TIME
153 Enabling this option enables the .weight interface for cost
154 model based proportional IO control. The IO controller
155 distributes IO capacity between different groups based on
156 their share of the overall weight distribution.
158 config BLK_CGROUP_IOPRIO
159 bool "Cgroup I/O controller for assigning an I/O priority class"
160 depends on BLK_CGROUP
162 Enable the .prio interface for assigning an I/O priority class to
163 requests. The I/O priority class affects the order in which an I/O
164 scheduler and block devices process requests. Only some I/O schedulers
165 and some block devices support I/O priorities.
168 bool "Block layer debugging information in debugfs"
172 Include block layer debugging information in debugfs. This information
173 is mostly useful for kernel developers, but it doesn't incur any cost
176 Unless you are building a kernel for a tiny system, you should
179 config BLK_DEBUG_FS_ZONED
181 default BLK_DEBUG_FS && BLK_DEV_ZONED
184 bool "Logic for interfacing with Opal enabled SEDs"
186 Builds Logic for interfacing with Opal enabled controllers.
187 Enabling this option enables users to setup/unlock/lock
188 Locking ranges for SED devices using the Opal protocol.
190 config BLK_INLINE_ENCRYPTION
191 bool "Enable inline encryption support in block layer"
193 Build the blk-crypto subsystem. Enabling this lets the
194 block layer handle encryption, so users can take
195 advantage of inline encryption hardware if present.
197 config BLK_INLINE_ENCRYPTION_FALLBACK
198 bool "Enable crypto API fallback for blk-crypto"
199 depends on BLK_INLINE_ENCRYPTION
201 select CRYPTO_SKCIPHER
203 Enabling this lets the block layer handle inline encryption
204 by falling back to the kernel crypto API when inline
205 encryption hardware is not present.
207 source "block/partitions/Kconfig"
222 depends on INFINIBAND
228 # do not use in new code
229 config BLOCK_HOLDER_DEPRECATED
232 config BLK_MQ_STACKING
235 source "block/Kconfig.iosched"