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 help 10 Provide block layer support for the kernel. 11 12 Disable this option to remove the block layer support from the 13 kernel. This may be useful for embedded devices. 14 15 If this option is disabled: 16 17 - block device files will become unusable 18 - some filesystems (such as ext3) will become unavailable. 19 20 Also, SCSI character devices and USB storage will be disabled since 21 they make use of various block layer definitions and facilities. 22 23 Say Y here unless you know you really don't want to mount disks and 24 suchlike. 25 26if BLOCK 27 28config BLOCK_LEGACY_AUTOLOAD 29 bool "Legacy autoloading support" 30 default y 31 help 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. 37 38config BLK_RQ_ALLOC_TIME 39 bool 40 41config BLK_CGROUP_RWSTAT 42 bool 43 44config BLK_DEV_BSG_COMMON 45 tristate 46 47config BLK_ICQ 48 bool 49 50config BLK_DEV_BSGLIB 51 bool "Block layer SG support v4 helper lib" 52 select BLK_DEV_BSG_COMMON 53 help 54 Subsystems will normally enable this if needed. Users will not 55 normally need to manually enable this. 56 57 If unsure, say N. 58 59config BLK_DEV_INTEGRITY 60 bool "Block layer data integrity support" 61 help 62 Some storage devices allow extra information to be 63 stored/retrieved to help protect the data. The block layer 64 data integrity option provides hooks which can be used by 65 filesystems to ensure better data integrity. 66 67 Say yes here if you have a storage device that provides the 68 T10/SCSI Data Integrity Field or the T13/ATA External Path 69 Protection. If in doubt, say N. 70 71config BLK_DEV_INTEGRITY_T10 72 tristate 73 depends on BLK_DEV_INTEGRITY 74 select CRC_T10DIF 75 select CRC64_ROCKSOFT 76 77config BLK_DEV_ZONED 78 bool "Zoned block device support" 79 select MQ_IOSCHED_DEADLINE 80 help 81 Block layer zoned block device support. This option enables 82 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 83 devices. 84 85 Say yes here if you have a ZAC, ZBC, or ZNS storage device. 86 87config BLK_DEV_THROTTLING 88 bool "Block layer bio throttling support" 89 depends on BLK_CGROUP 90 select BLK_CGROUP_RWSTAT 91 help 92 Block layer bio throttling support. It can be used to limit 93 the IO rate to a device. IO rate policies are per cgroup and 94 one needs to mount and use blkio cgroup controller for creating 95 cgroups and specifying per device IO rate policies. 96 97 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 98 99config BLK_DEV_THROTTLING_LOW 100 bool "Block throttling .low limit interface support (EXPERIMENTAL)" 101 depends on BLK_DEV_THROTTLING 102 help 103 Add .low limit interface for block throttling. The low limit is a best 104 effort limit to prioritize cgroups. Depending on the setting, the limit 105 can be used to protect cgroups in terms of bandwidth/iops and better 106 utilize disk resource. 107 108 Note, this is an experimental interface and could be changed someday. 109 110config BLK_WBT 111 bool "Enable support for block device writeback throttling" 112 help 113 Enabling this option enables the block layer to throttle buffered 114 background writeback from the VM, making it more smooth and having 115 less impact on foreground operations. The throttling is done 116 dynamically on an algorithm loosely based on CoDel, factoring in 117 the realtime performance of the disk. 118 119config BLK_WBT_MQ 120 bool "Enable writeback throttling by default" 121 default y 122 depends on BLK_WBT 123 help 124 Enable writeback throttling by default for request-based block devices. 125 126config BLK_CGROUP_IOLATENCY 127 bool "Enable support for latency based cgroup IO protection" 128 depends on BLK_CGROUP 129 help 130 Enabling this option enables the .latency interface for IO throttling. 131 The IO controller will attempt to maintain average IO latencies below 132 the configured latency target, throttling anybody with a higher latency 133 target than the victimized group. 134 135 Note, this is an experimental interface and could be changed someday. 136 137config BLK_CGROUP_FC_APPID 138 bool "Enable support to track FC I/O Traffic across cgroup applications" 139 depends on BLK_CGROUP && NVME_FC 140 help 141 Enabling this option enables the support to track FC I/O traffic across 142 cgroup applications. It enables the Fabric and the storage targets to 143 identify, monitor, and handle FC traffic based on VM tags by inserting 144 application specific identification into the FC frame. 145 146config BLK_CGROUP_IOCOST 147 bool "Enable support for cost model based cgroup IO controller" 148 depends on BLK_CGROUP 149 select BLK_RQ_ALLOC_TIME 150 help 151 Enabling this option enables the .weight interface for cost 152 model based proportional IO control. The IO controller 153 distributes IO capacity between different groups based on 154 their share of the overall weight distribution. 155 156config BLK_CGROUP_IOPRIO 157 bool "Cgroup I/O controller for assigning an I/O priority class" 158 depends on BLK_CGROUP 159 help 160 Enable the .prio interface for assigning an I/O priority class to 161 requests. The I/O priority class affects the order in which an I/O 162 scheduler and block devices process requests. Only some I/O schedulers 163 and some block devices support I/O priorities. 164 165config BLK_DEBUG_FS 166 bool "Block layer debugging information in debugfs" 167 default y 168 depends on DEBUG_FS 169 help 170 Include block layer debugging information in debugfs. This information 171 is mostly useful for kernel developers, but it doesn't incur any cost 172 at runtime. 173 174 Unless you are building a kernel for a tiny system, you should 175 say Y here. 176 177config BLK_DEBUG_FS_ZONED 178 bool 179 default BLK_DEBUG_FS && BLK_DEV_ZONED 180 181config BLK_SED_OPAL 182 bool "Logic for interfacing with Opal enabled SEDs" 183 help 184 Builds Logic for interfacing with Opal enabled controllers. 185 Enabling this option enables users to setup/unlock/lock 186 Locking ranges for SED devices using the Opal protocol. 187 188config BLK_INLINE_ENCRYPTION 189 bool "Enable inline encryption support in block layer" 190 help 191 Build the blk-crypto subsystem. Enabling this lets the 192 block layer handle encryption, so users can take 193 advantage of inline encryption hardware if present. 194 195config BLK_INLINE_ENCRYPTION_FALLBACK 196 bool "Enable crypto API fallback for blk-crypto" 197 depends on BLK_INLINE_ENCRYPTION 198 select CRYPTO 199 select CRYPTO_SKCIPHER 200 help 201 Enabling this lets the block layer handle inline encryption 202 by falling back to the kernel crypto API when inline 203 encryption hardware is not present. 204 205source "block/partitions/Kconfig" 206 207config BLK_MQ_PCI 208 def_bool PCI 209 210config BLK_MQ_VIRTIO 211 bool 212 depends on VIRTIO 213 default y 214 215config BLK_MQ_RDMA 216 bool 217 depends on INFINIBAND 218 default y 219 220config BLK_PM 221 def_bool PM 222 223# do not use in new code 224config BLOCK_HOLDER_DEPRECATED 225 bool 226 227config BLK_MQ_STACKING 228 bool 229 230source "block/Kconfig.iosched" 231 232endif # BLOCK 233