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 BLK_RQ_ALLOC_TIME 30 bool 31 32config BLK_CGROUP_RWSTAT 33 bool 34 35config BLK_DEV_BSG_COMMON 36 tristate 37 38config BLK_DEV_BSGLIB 39 bool "Block layer SG support v4 helper lib" 40 select BLK_DEV_BSG_COMMON 41 help 42 Subsystems will normally enable this if needed. Users will not 43 normally need to manually enable this. 44 45 If unsure, say N. 46 47config BLK_DEV_INTEGRITY 48 bool "Block layer data integrity support" 49 help 50 Some storage devices allow extra information to be 51 stored/retrieved to help protect the data. The block layer 52 data integrity option provides hooks which can be used by 53 filesystems to ensure better data integrity. 54 55 Say yes here if you have a storage device that provides the 56 T10/SCSI Data Integrity Field or the T13/ATA External Path 57 Protection. If in doubt, say N. 58 59config BLK_DEV_INTEGRITY_T10 60 tristate 61 depends on BLK_DEV_INTEGRITY 62 select CRC_T10DIF 63 64config BLK_DEV_ZONED 65 bool "Zoned block device support" 66 select MQ_IOSCHED_DEADLINE 67 help 68 Block layer zoned block device support. This option enables 69 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 70 devices. 71 72 Say yes here if you have a ZAC, ZBC, or ZNS storage device. 73 74config BLK_DEV_THROTTLING 75 bool "Block layer bio throttling support" 76 depends on BLK_CGROUP=y 77 select BLK_CGROUP_RWSTAT 78 help 79 Block layer bio throttling support. It can be used to limit 80 the IO rate to a device. IO rate policies are per cgroup and 81 one needs to mount and use blkio cgroup controller for creating 82 cgroups and specifying per device IO rate policies. 83 84 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 85 86config BLK_DEV_THROTTLING_LOW 87 bool "Block throttling .low limit interface support (EXPERIMENTAL)" 88 depends on BLK_DEV_THROTTLING 89 help 90 Add .low limit interface for block throttling. The low limit is a best 91 effort limit to prioritize cgroups. Depending on the setting, the limit 92 can be used to protect cgroups in terms of bandwidth/iops and better 93 utilize disk resource. 94 95 Note, this is an experimental interface and could be changed someday. 96 97config BLK_WBT 98 bool "Enable support for block device writeback throttling" 99 help 100 Enabling this option enables the block layer to throttle buffered 101 background writeback from the VM, making it more smooth and having 102 less impact on foreground operations. The throttling is done 103 dynamically on an algorithm loosely based on CoDel, factoring in 104 the realtime performance of the disk. 105 106config BLK_WBT_MQ 107 bool "Enable writeback throttling by default" 108 default y 109 depends on BLK_WBT 110 help 111 Enable writeback throttling by default for request-based block devices. 112 113config BLK_CGROUP_IOLATENCY 114 bool "Enable support for latency based cgroup IO protection" 115 depends on BLK_CGROUP=y 116 help 117 Enabling this option enables the .latency interface for IO throttling. 118 The IO controller will attempt to maintain average IO latencies below 119 the configured latency target, throttling anybody with a higher latency 120 target than the victimized group. 121 122 Note, this is an experimental interface and could be changed someday. 123 124config BLK_CGROUP_FC_APPID 125 bool "Enable support to track FC I/O Traffic across cgroup applications" 126 depends on BLK_CGROUP && NVME_FC 127 help 128 Enabling this option enables the support to track FC I/O traffic across 129 cgroup applications. It enables the Fabric and the storage targets to 130 identify, monitor, and handle FC traffic based on VM tags by inserting 131 application specific identification into the FC frame. 132 133config BLK_CGROUP_IOCOST 134 bool "Enable support for cost model based cgroup IO controller" 135 depends on BLK_CGROUP=y 136 select BLK_RQ_IO_DATA_LEN 137 select BLK_RQ_ALLOC_TIME 138 help 139 Enabling this option enables the .weight interface for cost 140 model based proportional IO control. The IO controller 141 distributes IO capacity between different groups based on 142 their share of the overall weight distribution. 143 144config BLK_CGROUP_IOPRIO 145 bool "Cgroup I/O controller for assigning an I/O priority class" 146 depends on BLK_CGROUP 147 help 148 Enable the .prio interface for assigning an I/O priority class to 149 requests. The I/O priority class affects the order in which an I/O 150 scheduler and block devices process requests. Only some I/O schedulers 151 and some block devices support I/O priorities. 152 153config BLK_DEBUG_FS 154 bool "Block layer debugging information in debugfs" 155 default y 156 depends on DEBUG_FS 157 help 158 Include block layer debugging information in debugfs. This information 159 is mostly useful for kernel developers, but it doesn't incur any cost 160 at runtime. 161 162 Unless you are building a kernel for a tiny system, you should 163 say Y here. 164 165config BLK_DEBUG_FS_ZONED 166 bool 167 default BLK_DEBUG_FS && BLK_DEV_ZONED 168 169config BLK_SED_OPAL 170 bool "Logic for interfacing with Opal enabled SEDs" 171 help 172 Builds Logic for interfacing with Opal enabled controllers. 173 Enabling this option enables users to setup/unlock/lock 174 Locking ranges for SED devices using the Opal protocol. 175 176config BLK_INLINE_ENCRYPTION 177 bool "Enable inline encryption support in block layer" 178 help 179 Build the blk-crypto subsystem. Enabling this lets the 180 block layer handle encryption, so users can take 181 advantage of inline encryption hardware if present. 182 183config BLK_INLINE_ENCRYPTION_FALLBACK 184 bool "Enable crypto API fallback for blk-crypto" 185 depends on BLK_INLINE_ENCRYPTION 186 select CRYPTO 187 select CRYPTO_SKCIPHER 188 help 189 Enabling this lets the block layer handle inline encryption 190 by falling back to the kernel crypto API when inline 191 encryption hardware is not present. 192 193menu "Partition Types" 194 195source "block/partitions/Kconfig" 196 197endmenu 198 199endif # BLOCK 200 201config BLOCK_COMPAT 202 bool 203 depends on BLOCK && COMPAT 204 default y 205 206config BLK_MQ_PCI 207 bool 208 depends on BLOCK && PCI 209 default y 210 211config BLK_MQ_VIRTIO 212 bool 213 depends on BLOCK && VIRTIO 214 default y 215 216config BLK_MQ_RDMA 217 bool 218 depends on BLOCK && INFINIBAND 219 default y 220 221config BLK_PM 222 def_bool BLOCK && PM 223 224# do not use in new code 225config BLOCK_HOLDER_DEPRECATED 226 bool 227 228source "block/Kconfig.iosched" 229