1 # SPDX-License-Identifier: GPL-2.0
3 # Block layer core configuration
6 bool "Enable the block layer" if EXPERT
11 Provide block layer support for the kernel.
13 Disable this option to remove the block layer support from the
14 kernel. This may be useful for embedded devices.
16 If this option is disabled:
18 - block device files will become unusable
19 - some filesystems (such as ext3) will become unavailable.
21 Also, SCSI character devices and USB storage will be disabled since
22 they make use of various block layer definitions and facilities.
24 Say Y here unless you know you really don't want to mount disks and
29 config BLK_RQ_ALLOC_TIME
32 config BLK_SCSI_REQUEST
35 config BLK_CGROUP_RWSTAT
39 bool "Block layer SG support v4"
41 select BLK_SCSI_REQUEST
43 Saying Y here will enable generic SG (SCSI generic) v4 support
46 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
47 can handle complicated SCSI commands: tagged variable length cdbs
48 with bidirectional data transfers and generic request/response
49 protocols (e.g. Task Management Functions and SMP in Serial
52 This option is required by recent UDEV versions to properly
53 access device serial numbers, etc.
58 bool "Block layer SG support v4 helper lib"
60 select BLK_SCSI_REQUEST
62 Subsystems will normally enable this if needed. Users will not
63 normally need to manually enable this.
67 config BLK_DEV_INTEGRITY
68 bool "Block layer data integrity support"
69 select CRC_T10DIF if BLK_DEV_INTEGRITY
71 Some storage devices allow extra information to be
72 stored/retrieved to help protect the data. The block layer
73 data integrity option provides hooks which can be used by
74 filesystems to ensure better data integrity.
76 Say yes here if you have a storage device that provides the
77 T10/SCSI Data Integrity Field or the T13/ATA External Path
78 Protection. If in doubt, say N.
81 bool "Zoned block device support"
82 select MQ_IOSCHED_DEADLINE
84 Block layer zoned block device support. This option enables
85 support for ZAC/ZBC host-managed and host-aware zoned block devices.
87 Say yes here if you have a ZAC or ZBC storage device.
89 config BLK_DEV_THROTTLING
90 bool "Block layer bio throttling support"
91 depends on BLK_CGROUP=y
92 select BLK_CGROUP_RWSTAT
94 Block layer bio throttling support. It can be used to limit
95 the IO rate to a device. IO rate policies are per cgroup and
96 one needs to mount and use blkio cgroup controller for creating
97 cgroups and specifying per device IO rate policies.
99 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
101 config BLK_DEV_THROTTLING_LOW
102 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
103 depends on BLK_DEV_THROTTLING
105 Add .low limit interface for block throttling. The low limit is a best
106 effort limit to prioritize cgroups. Depending on the setting, the limit
107 can be used to protect cgroups in terms of bandwidth/iops and better
108 utilize disk resource.
110 Note, this is an experimental interface and could be changed someday.
112 config BLK_CMDLINE_PARSER
113 bool "Block device command line partition parser"
115 Enabling this option allows you to specify the partition layout from
116 the kernel boot args. This is typically of use for embedded devices
117 which don't otherwise have any standardized method for listing the
118 partitions on a block device.
120 See Documentation/block/cmdline-partition.rst for more information.
123 bool "Enable support for block device writeback throttling"
125 Enabling this option enables the block layer to throttle buffered
126 background writeback from the VM, making it more smooth and having
127 less impact on foreground operations. The throttling is done
128 dynamically on an algorithm loosely based on CoDel, factoring in
129 the realtime performance of the disk.
131 config BLK_CGROUP_IOLATENCY
132 bool "Enable support for latency based cgroup IO protection"
133 depends on BLK_CGROUP=y
135 Enabling this option enables the .latency interface for IO throttling.
136 The IO controller will attempt to maintain average IO latencies below
137 the configured latency target, throttling anybody with a higher latency
138 target than the victimized group.
140 Note, this is an experimental interface and could be changed someday.
142 config BLK_CGROUP_IOCOST
143 bool "Enable support for cost model based cgroup IO controller"
144 depends on BLK_CGROUP=y
145 select BLK_RQ_ALLOC_TIME
147 Enabling this option enables the .weight interface for cost
148 model based proportional IO control. The IO controller
149 distributes IO capacity between different groups based on
150 their share of the overall weight distribution.
153 bool "Multiqueue writeback throttling"
157 Enable writeback throttling by default on multiqueue devices.
158 Multiqueue currently doesn't have support for IO scheduling,
159 enabling this option is recommended.
162 bool "Block layer debugging information in debugfs"
166 Include block layer debugging information in debugfs. This information
167 is mostly useful for kernel developers, but it doesn't incur any cost
170 Unless you are building a kernel for a tiny system, you should
173 config BLK_DEBUG_FS_ZONED
175 default BLK_DEBUG_FS && BLK_DEV_ZONED
178 bool "Logic for interfacing with Opal enabled SEDs"
180 Builds Logic for interfacing with Opal enabled controllers.
181 Enabling this option enables users to setup/unlock/lock
182 Locking ranges for SED devices using the Opal protocol.
184 menu "Partition Types"
186 source "block/partitions/Kconfig"
194 depends on BLOCK && COMPAT
199 depends on BLOCK && PCI
204 depends on BLOCK && VIRTIO
209 depends on BLOCK && INFINIBAND
215 source "block/Kconfig.iosched"