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 BLK_RQ_ALLOC_TIME
  30         bool
  31
  32 config BLK_CGROUP_RWSTAT
  33         bool
  34
  35 config BLK_DEV_BSG_COMMON
  36         tristate
  37
  38 config 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
  47 config 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
  59 config BLK_DEV_INTEGRITY_T10
  60         tristate
  61         depends on BLK_DEV_INTEGRITY
  62         select CRC_T10DIF
  63
  64 config 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
  74 config 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
  86 config 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
  97 config 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
 106 config 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
 113 config 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
 124 config 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
 133 config 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
 144 config 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
 153 config 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
 165 config BLK_DEBUG_FS_ZONED
 166        bool
 167        default BLK_DEBUG_FS && BLK_DEV_ZONED
 168
 169 config 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
 176 config 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
 183 config 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
 193 menu "Partition Types"
 194
 195 source "block/partitions/Kconfig"
 196
 197 endmenu
 198
 199 endif # BLOCK
 200
 201 config BLOCK_COMPAT
 202         bool
 203         depends on BLOCK && COMPAT
 204         default y
 205
 206 config BLK_MQ_PCI
 207         bool
 208         depends on BLOCK && PCI
 209         default y
 210
 211 config BLK_MQ_VIRTIO
 212         bool
 213         depends on BLOCK && VIRTIO
 214         default y
 215
 216 config BLK_MQ_RDMA
 217         bool
 218         depends on BLOCK && INFINIBAND
 219         default y
 220
 221 config BLK_PM
 222         def_bool BLOCK && PM
 223
 224 # do not use in new code
 225 config BLOCK_HOLDER_DEPRECATED
 226         bool
 227
 228 source "block/Kconfig.iosched"