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