1 # SPDX-License-Identifier: GPL-2.0
3 # Block layer core configuration
6 bool "Enable the block layer" if EXPERT
10 Provide block layer support for the kernel.
12 Disable this option to remove the block layer support from the
13 kernel. This may be useful for embedded devices.
15 If this option is disabled:
17 - block device files will become unusable
18 - some filesystems (such as ext3) will become unavailable.
20 Also, SCSI character devices and USB storage will be disabled since
21 they make use of various block layer definitions and facilities.
23 Say Y here unless you know you really don't want to mount disks and
28 config BLOCK_LEGACY_AUTOLOAD
29 bool "Legacy autoloading support"
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.
38 config BLK_RQ_ALLOC_TIME
41 config BLK_CGROUP_RWSTAT
44 config BLK_CGROUP_PUNT_BIO
47 config BLK_DEV_BSG_COMMON
54 bool "Block layer SG support v4 helper lib"
55 select BLK_DEV_BSG_COMMON
57 Subsystems will normally enable this if needed. Users will not
58 normally need to manually enable this.
62 config BLK_DEV_INTEGRITY
63 bool "Block layer data integrity support"
65 Some storage devices allow extra information to be
66 stored/retrieved to help protect the data. The block layer
67 data integrity option provides hooks which can be used by
68 filesystems to ensure better data integrity.
70 Say yes here if you have a storage device that provides the
71 T10/SCSI Data Integrity Field or the T13/ATA External Path
72 Protection. If in doubt, say N.
74 config BLK_DEV_INTEGRITY_T10
76 depends on BLK_DEV_INTEGRITY
81 bool "Zoned block device support"
82 select MQ_IOSCHED_DEADLINE
84 Block layer zoned block device support. This option enables
85 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
88 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
90 config BLK_DEV_THROTTLING
91 bool "Block layer bio throttling support"
93 select BLK_CGROUP_RWSTAT
95 Block layer bio throttling support. It can be used to limit
96 the IO rate to a device. IO rate policies are per cgroup and
97 one needs to mount and use blkio cgroup controller for creating
98 cgroups and specifying per device IO rate policies.
100 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
102 config BLK_DEV_THROTTLING_LOW
103 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
104 depends on BLK_DEV_THROTTLING
106 Add .low limit interface for block throttling. The low limit is a best
107 effort limit to prioritize cgroups. Depending on the setting, the limit
108 can be used to protect cgroups in terms of bandwidth/iops and better
109 utilize disk resource.
111 Note, this is an experimental interface and could be changed someday.
114 bool "Enable support for block device writeback throttling"
116 Enabling this option enables the block layer to throttle buffered
117 background writeback from the VM, making it more smooth and having
118 less impact on foreground operations. The throttling is done
119 dynamically on an algorithm loosely based on CoDel, factoring in
120 the realtime performance of the disk.
123 bool "Enable writeback throttling by default"
127 Enable writeback throttling by default for request-based block devices.
129 config BLK_CGROUP_IOLATENCY
130 bool "Enable support for latency based cgroup IO protection"
131 depends on BLK_CGROUP
133 Enabling this option enables the .latency interface for IO throttling.
134 The IO controller will attempt to maintain average IO latencies below
135 the configured latency target, throttling anybody with a higher latency
136 target than the victimized group.
138 Note, this is an experimental interface and could be changed someday.
140 config BLK_CGROUP_FC_APPID
141 bool "Enable support to track FC I/O Traffic across cgroup applications"
142 depends on BLK_CGROUP && NVME_FC
144 Enabling this option enables the support to track FC I/O traffic across
145 cgroup applications. It enables the Fabric and the storage targets to
146 identify, monitor, and handle FC traffic based on VM tags by inserting
147 application specific identification into the FC frame.
149 config BLK_CGROUP_IOCOST
150 bool "Enable support for cost model based cgroup IO controller"
151 depends on BLK_CGROUP
152 select BLK_RQ_ALLOC_TIME
154 Enabling this option enables the .weight interface for cost
155 model based proportional IO control. The IO controller
156 distributes IO capacity between different groups based on
157 their share of the overall weight distribution.
159 config BLK_CGROUP_IOPRIO
160 bool "Cgroup I/O controller for assigning an I/O priority class"
161 depends on BLK_CGROUP
163 Enable the .prio interface for assigning an I/O priority class to
164 requests. The I/O priority class affects the order in which an I/O
165 scheduler and block devices process requests. Only some I/O schedulers
166 and some block devices support I/O priorities.
169 bool "Block layer debugging information in debugfs"
173 Include block layer debugging information in debugfs. This information
174 is mostly useful for kernel developers, but it doesn't incur any cost
177 Unless you are building a kernel for a tiny system, you should
180 config BLK_DEBUG_FS_ZONED
182 default BLK_DEBUG_FS && BLK_DEV_ZONED
185 bool "Logic for interfacing with Opal enabled SEDs"
187 Builds Logic for interfacing with Opal enabled controllers.
188 Enabling this option enables users to setup/unlock/lock
189 Locking ranges for SED devices using the Opal protocol.
191 config BLK_INLINE_ENCRYPTION
192 bool "Enable inline encryption support in block layer"
194 Build the blk-crypto subsystem. Enabling this lets the
195 block layer handle encryption, so users can take
196 advantage of inline encryption hardware if present.
198 config BLK_INLINE_ENCRYPTION_FALLBACK
199 bool "Enable crypto API fallback for blk-crypto"
200 depends on BLK_INLINE_ENCRYPTION
202 select CRYPTO_SKCIPHER
204 Enabling this lets the block layer handle inline encryption
205 by falling back to the kernel crypto API when inline
206 encryption hardware is not present.
208 source "block/partitions/Kconfig"
221 # do not use in new code
222 config BLOCK_HOLDER_DEPRECATED
225 config BLK_MQ_STACKING
228 source "block/Kconfig.iosched"