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"
70 Some storage devices allow extra information to be
71 stored/retrieved to help protect the data. The block layer
72 data integrity option provides hooks which can be used by
73 filesystems to ensure better data integrity.
75 Say yes here if you have a storage device that provides the
76 T10/SCSI Data Integrity Field or the T13/ATA External Path
77 Protection. If in doubt, say N.
79 config BLK_DEV_INTEGRITY_T10
81 depends on BLK_DEV_INTEGRITY
85 bool "Zoned block device support"
86 select MQ_IOSCHED_DEADLINE
88 Block layer zoned block device support. This option enables
89 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
92 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
94 config BLK_DEV_THROTTLING
95 bool "Block layer bio throttling support"
96 depends on BLK_CGROUP=y
97 select BLK_CGROUP_RWSTAT
99 Block layer bio throttling support. It can be used to limit
100 the IO rate to a device. IO rate policies are per cgroup and
101 one needs to mount and use blkio cgroup controller for creating
102 cgroups and specifying per device IO rate policies.
104 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
106 config BLK_DEV_THROTTLING_LOW
107 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
108 depends on BLK_DEV_THROTTLING
110 Add .low limit interface for block throttling. The low limit is a best
111 effort limit to prioritize cgroups. Depending on the setting, the limit
112 can be used to protect cgroups in terms of bandwidth/iops and better
113 utilize disk resource.
115 Note, this is an experimental interface and could be changed someday.
117 config BLK_CMDLINE_PARSER
118 bool "Block device command line partition parser"
120 Enabling this option allows you to specify the partition layout from
121 the kernel boot args. This is typically of use for embedded devices
122 which don't otherwise have any standardized method for listing the
123 partitions on a block device.
125 See Documentation/block/cmdline-partition.rst for more information.
128 bool "Enable support for block device writeback throttling"
130 Enabling this option enables the block layer to throttle buffered
131 background writeback from the VM, making it more smooth and having
132 less impact on foreground operations. The throttling is done
133 dynamically on an algorithm loosely based on CoDel, factoring in
134 the realtime performance of the disk.
136 config BLK_CGROUP_IOLATENCY
137 bool "Enable support for latency based cgroup IO protection"
138 depends on BLK_CGROUP=y
140 Enabling this option enables the .latency interface for IO throttling.
141 The IO controller will attempt to maintain average IO latencies below
142 the configured latency target, throttling anybody with a higher latency
143 target than the victimized group.
145 Note, this is an experimental interface and could be changed someday.
147 config BLK_CGROUP_IOCOST
148 bool "Enable support for cost model based cgroup IO controller"
149 depends on BLK_CGROUP=y
150 select BLK_RQ_IO_DATA_LEN
151 select BLK_RQ_ALLOC_TIME
153 Enabling this option enables the .weight interface for cost
154 model based proportional IO control. The IO controller
155 distributes IO capacity between different groups based on
156 their share of the overall weight distribution.
159 bool "Multiqueue writeback throttling"
163 Enable writeback throttling by default on multiqueue devices.
166 bool "Block layer debugging information in debugfs"
170 Include block layer debugging information in debugfs. This information
171 is mostly useful for kernel developers, but it doesn't incur any cost
174 Unless you are building a kernel for a tiny system, you should
177 config BLK_DEBUG_FS_ZONED
179 default BLK_DEBUG_FS && BLK_DEV_ZONED
182 bool "Logic for interfacing with Opal enabled SEDs"
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.
188 config BLK_INLINE_ENCRYPTION
189 bool "Enable inline encryption support in block layer"
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.
195 config BLK_INLINE_ENCRYPTION_FALLBACK
196 bool "Enable crypto API fallback for blk-crypto"
197 depends on BLK_INLINE_ENCRYPTION
199 select CRYPTO_SKCIPHER
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.
205 menu "Partition Types"
207 source "block/partitions/Kconfig"
215 depends on BLOCK && COMPAT
220 depends on BLOCK && PCI
225 depends on BLOCK && VIRTIO
230 depends on BLOCK && INFINIBAND
236 source "block/Kconfig.iosched"