Merge tag 'execve-v5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
[linux-block.git] / block / Kconfig
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b2441318 1# SPDX-License-Identifier: GPL-2.0
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2#
3# Block layer core configuration
4#
16ed002f 5menuconfig BLOCK
6a108a14 6 bool "Enable the block layer" if EXPERT
9361401e 7 default y
88459642 8 select SBITMAP
6a83e74d 9 select SRCU
9361401e 10 help
ee86418d 11 Provide block layer support for the kernel.
9361401e 12
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13 Disable this option to remove the block layer support from the
14 kernel. This may be useful for embedded devices.
15
16 If this option is disabled:
17
18 - block device files will become unusable
19 - some filesystems (such as ext3) will become unavailable.
20
21 Also, SCSI character devices and USB storage will be disabled since
22 they make use of various block layer definitions and facilities.
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23
24 Say Y here unless you know you really don't want to mount disks and
25 suchlike.
26
27if BLOCK
3a65dfe8 28
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29config BLOCK_LEGACY_AUTOLOAD
30 bool "Legacy autoloading support"
451f0b6f 31 default y
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32 help
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
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36 created on demand, but scripts that manually create device nodes and
37 then call losetup might rely on this behavior.
fbdee71b 38
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39config BLK_RQ_ALLOC_TIME
40 bool
41
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42config BLK_CGROUP_RWSTAT
43 bool
44
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45config BLK_DEV_BSG_COMMON
46 tristate
3d6392cf 47
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48config BLK_ICQ
49 bool
50
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51config BLK_DEV_BSGLIB
52 bool "Block layer SG support v4 helper lib"
78011042 53 select BLK_DEV_BSG_COMMON
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54 help
55 Subsystems will normally enable this if needed. Users will not
56 normally need to manually enable this.
57
58 If unsure, say N.
59
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60config BLK_DEV_INTEGRITY
61 bool "Block layer data integrity support"
a7f7f624 62 help
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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.
67
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.
71
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72config BLK_DEV_INTEGRITY_T10
73 tristate
74 depends on BLK_DEV_INTEGRITY
75 select CRC_T10DIF
a7d4383f 76 select CRC64_ROCKSOFT
a754bd5f 77
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78config BLK_DEV_ZONED
79 bool "Zoned block device support"
b9aef63a 80 select MQ_IOSCHED_DEADLINE
a7f7f624 81 help
6a0cb1bc 82 Block layer zoned block device support. This option enables
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83 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
84 devices.
6a0cb1bc 85
240e6ee2 86 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
6a0cb1bc 87
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88config BLK_DEV_THROTTLING
89 bool "Block layer bio throttling support"
df252bde 90 depends on BLK_CGROUP
1d156646 91 select BLK_CGROUP_RWSTAT
a7f7f624 92 help
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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.
97
da82c92f 98 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
e43473b7 99
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100config BLK_DEV_THROTTLING_LOW
101 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
102 depends on BLK_DEV_THROTTLING
a7f7f624 103 help
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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.
108
109 Note, this is an experimental interface and could be changed someday.
110
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111config BLK_WBT
112 bool "Enable support for block device writeback throttling"
a7f7f624 113 help
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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.
119
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120config BLK_WBT_MQ
121 bool "Enable writeback throttling by default"
122 default y
123 depends on BLK_WBT
124 help
125 Enable writeback throttling by default for request-based block devices.
126
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127config BLK_CGROUP_IOLATENCY
128 bool "Enable support for latency based cgroup IO protection"
df252bde 129 depends on BLK_CGROUP
a7f7f624 130 help
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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.
135
136 Note, this is an experimental interface and could be changed someday.
137
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138config BLK_CGROUP_FC_APPID
139 bool "Enable support to track FC I/O Traffic across cgroup applications"
d2500a0c 140 depends on BLK_CGROUP && NVME_FC
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141 help
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.
146
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147config BLK_CGROUP_IOCOST
148 bool "Enable support for cost model based cgroup IO controller"
df252bde 149 depends on BLK_CGROUP
cd006509 150 select BLK_RQ_IO_DATA_LEN
7caa4715 151 select BLK_RQ_ALLOC_TIME
a7f7f624 152 help
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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.
157
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158config BLK_CGROUP_IOPRIO
159 bool "Cgroup I/O controller for assigning an I/O priority class"
160 depends on BLK_CGROUP
161 help
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.
166
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167config BLK_DEBUG_FS
168 bool "Block layer debugging information in debugfs"
169 default y
170 depends on DEBUG_FS
a7f7f624 171 help
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172 Include block layer debugging information in debugfs. This information
173 is mostly useful for kernel developers, but it doesn't incur any cost
174 at runtime.
175
176 Unless you are building a kernel for a tiny system, you should
177 say Y here.
178
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179config BLK_DEBUG_FS_ZONED
180 bool
181 default BLK_DEBUG_FS && BLK_DEV_ZONED
182
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183config BLK_SED_OPAL
184 bool "Logic for interfacing with Opal enabled SEDs"
a7f7f624 185 help
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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.
189
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190config BLK_INLINE_ENCRYPTION
191 bool "Enable inline encryption support in block layer"
192 help
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.
196
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197config BLK_INLINE_ENCRYPTION_FALLBACK
198 bool "Enable crypto API fallback for blk-crypto"
199 depends on BLK_INLINE_ENCRYPTION
200 select CRYPTO
201 select CRYPTO_SKCIPHER
202 help
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.
206
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207source "block/partitions/Kconfig"
208
99874d50 209config BLOCK_COMPAT
c50fca55 210 def_bool COMPAT
99874d50 211
8ec2ef2b 212config BLK_MQ_PCI
c50fca55 213 def_bool PCI
8ec2ef2b 214
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215config BLK_MQ_VIRTIO
216 bool
c50fca55 217 depends on VIRTIO
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218 default y
219
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220config BLK_MQ_RDMA
221 bool
c50fca55 222 depends on INFINIBAND
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223 default y
224
bca6b067 225config BLK_PM
c50fca55 226 def_bool PM
bca6b067 227
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228# do not use in new code
229config BLOCK_HOLDER_DEPRECATED
230 bool
231
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232config BLK_MQ_STACKING
233 bool
234
8636a1f9 235source "block/Kconfig.iosched"
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236
237endif # BLOCK