block/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Block layer core configuration
   4 #
   5 menuconfig 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
  27 if BLOCK
  28
  29 config 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
  39 config BLK_RQ_ALLOC_TIME
  40         bool
  41
  42 config BLK_CGROUP_RWSTAT
  43         bool
  44
  45 config BLK_DEV_BSG_COMMON
  46         tristate
  47
  48 config BLK_ICQ
  49         bool
  50
  51 config 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
  60 config 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
  72 config BLK_DEV_INTEGRITY_T10
  73         tristate
  74         depends on BLK_DEV_INTEGRITY
  75         select CRC_T10DIF
  76         select CRC64_ROCKSOFT
  77
  78 config 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
  88 config 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
 100 config 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
 111 config 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
 120 config 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
 127 config 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
 138 config 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
 147 config BLK_CGROUP_IOCOST
 148         bool "Enable support for cost model based cgroup IO controller"
 149         depends on BLK_CGROUP
 150         select BLK_RQ_ALLOC_TIME
 151         help
 152         Enabling this option enables the .weight interface for cost
 153         model based proportional IO control.  The IO controller
 154         distributes IO capacity between different groups based on
 155         their share of the overall weight distribution.
 156
 157 config BLK_CGROUP_IOPRIO
 158         bool "Cgroup I/O controller for assigning an I/O priority class"
 159         depends on BLK_CGROUP
 160         help
 161         Enable the .prio interface for assigning an I/O priority class to
 162         requests. The I/O priority class affects the order in which an I/O
 163         scheduler and block devices process requests. Only some I/O schedulers
 164         and some block devices support I/O priorities.
 165
 166 config BLK_DEBUG_FS
 167         bool "Block layer debugging information in debugfs"
 168         default y
 169         depends on DEBUG_FS
 170         help
 171         Include block layer debugging information in debugfs. This information
 172         is mostly useful for kernel developers, but it doesn't incur any cost
 173         at runtime.
 174
 175         Unless you are building a kernel for a tiny system, you should
 176         say Y here.
 177
 178 config BLK_DEBUG_FS_ZONED
 179        bool
 180        default BLK_DEBUG_FS && BLK_DEV_ZONED
 181
 182 config BLK_SED_OPAL
 183         bool "Logic for interfacing with Opal enabled SEDs"
 184         help
 185         Builds Logic for interfacing with Opal enabled controllers.
 186         Enabling this option enables users to setup/unlock/lock
 187         Locking ranges for SED devices using the Opal protocol.
 188
 189 config BLK_INLINE_ENCRYPTION
 190         bool "Enable inline encryption support in block layer"
 191         help
 192           Build the blk-crypto subsystem. Enabling this lets the
 193           block layer handle encryption, so users can take
 194           advantage of inline encryption hardware if present.
 195
 196 config BLK_INLINE_ENCRYPTION_FALLBACK
 197         bool "Enable crypto API fallback for blk-crypto"
 198         depends on BLK_INLINE_ENCRYPTION
 199         select CRYPTO
 200         select CRYPTO_SKCIPHER
 201         help
 202           Enabling this lets the block layer handle inline encryption
 203           by falling back to the kernel crypto API when inline
 204           encryption hardware is not present.
 205
 206 source "block/partitions/Kconfig"
 207
 208 config BLOCK_COMPAT
 209         def_bool COMPAT
 210
 211 config BLK_MQ_PCI
 212         def_bool PCI
 213
 214 config BLK_MQ_VIRTIO
 215         bool
 216         depends on VIRTIO
 217         default y
 218
 219 config BLK_MQ_RDMA
 220         bool
 221         depends on INFINIBAND
 222         default y
 223
 224 config BLK_PM
 225         def_bool PM
 226
 227 # do not use in new code
 228 config BLOCK_HOLDER_DEPRECATED
 229         bool
 230
 231 config BLK_MQ_STACKING
 232         bool
 233
 234 source "block/Kconfig.iosched"
 235
 236 endif # BLOCK