1# SPDX-License-Identifier: GPL-2.0 2# 3# Block layer core configuration 4# 5menuconfig BLOCK 6 bool "Enable the block layer" if EXPERT 7 default y 8 select SBITMAP 9 select SRCU 10 help 11 Provide block layer support for the kernel. 12 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. 23 24 Say Y here unless you know you really don't want to mount disks and 25 suchlike. 26 27if BLOCK 28 29config BLOCK_LEGACY_AUTOLOAD 30 bool "Legacy autoloading support" 31 default y 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 36 created on demand, but scripts that manually create device nodes and 37 then call losetup might rely on this behavior. 38 39config BLK_RQ_ALLOC_TIME 40 bool 41 42config BLK_CGROUP_RWSTAT 43 bool 44 45config BLK_DEV_BSG_COMMON 46 tristate 47 48config BLK_ICQ 49 bool 50 51config BLK_DEV_BSGLIB 52 bool "Block layer SG support v4 helper lib" 53 select BLK_DEV_BSG_COMMON 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 60config BLK_DEV_INTEGRITY 61 bool "Block layer data integrity support" 62 help 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 72config BLK_DEV_INTEGRITY_T10 73 tristate 74 depends on BLK_DEV_INTEGRITY 75 select CRC_T10DIF 76 select CRC64_ROCKSOFT 77 78config BLK_DEV_ZONED 79 bool "Zoned block device support" 80 select MQ_IOSCHED_DEADLINE 81 help 82 Block layer zoned block device support. This option enables 83 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 84 devices. 85 86 Say yes here if you have a ZAC, ZBC, or ZNS storage device. 87 88config BLK_DEV_THROTTLING 89 bool "Block layer bio throttling support" 90 depends on BLK_CGROUP 91 select BLK_CGROUP_RWSTAT 92 help 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 98 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 99 100config BLK_DEV_THROTTLING_LOW 101 bool "Block throttling .low limit interface support (EXPERIMENTAL)" 102 depends on BLK_DEV_THROTTLING 103 help 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 111config BLK_WBT 112 bool "Enable support for block device writeback throttling" 113 help 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 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 127config BLK_CGROUP_IOLATENCY 128 bool "Enable support for latency based cgroup IO protection" 129 depends on BLK_CGROUP 130 help 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 138config BLK_CGROUP_FC_APPID 139 bool "Enable support to track FC I/O Traffic across cgroup applications" 140 depends on BLK_CGROUP && NVME_FC 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 147config 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 152 help 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 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 167config BLK_DEBUG_FS 168 bool "Block layer debugging information in debugfs" 169 default y 170 depends on DEBUG_FS 171 help 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 179config BLK_DEBUG_FS_ZONED 180 bool 181 default BLK_DEBUG_FS && BLK_DEV_ZONED 182 183config BLK_SED_OPAL 184 bool "Logic for interfacing with Opal enabled SEDs" 185 help 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 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 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 207source "block/partitions/Kconfig" 208 209config BLOCK_COMPAT 210 def_bool COMPAT 211 212config BLK_MQ_PCI 213 def_bool PCI 214 215config BLK_MQ_VIRTIO 216 bool 217 depends on VIRTIO 218 default y 219 220config BLK_MQ_RDMA 221 bool 222 depends on INFINIBAND 223 default y 224 225config BLK_PM 226 def_bool PM 227 228# do not use in new code 229config BLOCK_HOLDER_DEPRECATED 230 bool 231 232config BLK_MQ_STACKING 233 bool 234 235source "block/Kconfig.iosched" 236 237endif # BLOCK 238