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_CGROUP_RWSTAT
35 config BLK_DEV_BSG_COMMON
39 bool "Block layer SG support v4 helper lib"
40 select BLK_DEV_BSG_COMMON
42 Subsystems will normally enable this if needed. Users will not
43 normally need to manually enable this.
47 config BLK_DEV_INTEGRITY
48 bool "Block layer data integrity support"
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.
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.
59 config BLK_DEV_INTEGRITY_T10
61 depends on BLK_DEV_INTEGRITY
65 bool "Zoned block device support"
66 select MQ_IOSCHED_DEADLINE
68 Block layer zoned block device support. This option enables
69 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
72 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
74 config BLK_DEV_THROTTLING
75 bool "Block layer bio throttling support"
76 depends on BLK_CGROUP=y
77 select BLK_CGROUP_RWSTAT
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.
84 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
86 config BLK_DEV_THROTTLING_LOW
87 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
88 depends on BLK_DEV_THROTTLING
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.
95 Note, this is an experimental interface and could be changed someday.
97 config BLK_CMDLINE_PARSER
98 bool "Block device command line partition parser"
100 Enabling this option allows you to specify the partition layout from
101 the kernel boot args. This is typically of use for embedded devices
102 which don't otherwise have any standardized method for listing the
103 partitions on a block device.
105 See Documentation/block/cmdline-partition.rst for more information.
108 bool "Enable support for block device writeback throttling"
110 Enabling this option enables the block layer to throttle buffered
111 background writeback from the VM, making it more smooth and having
112 less impact on foreground operations. The throttling is done
113 dynamically on an algorithm loosely based on CoDel, factoring in
114 the realtime performance of the disk.
117 bool "Enable writeback throttling by default"
121 Enable writeback throttling by default for request-based block devices.
123 config BLK_CGROUP_IOLATENCY
124 bool "Enable support for latency based cgroup IO protection"
125 depends on BLK_CGROUP=y
127 Enabling this option enables the .latency interface for IO throttling.
128 The IO controller will attempt to maintain average IO latencies below
129 the configured latency target, throttling anybody with a higher latency
130 target than the victimized group.
132 Note, this is an experimental interface and could be changed someday.
134 config BLK_CGROUP_FC_APPID
135 bool "Enable support to track FC I/O Traffic across cgroup applications"
136 depends on BLK_CGROUP && NVME_FC
138 Enabling this option enables the support to track FC I/O traffic across
139 cgroup applications. It enables the Fabric and the storage targets to
140 identify, monitor, and handle FC traffic based on VM tags by inserting
141 application specific identification into the FC frame.
143 config BLK_CGROUP_IOCOST
144 bool "Enable support for cost model based cgroup IO controller"
145 depends on BLK_CGROUP=y
146 select BLK_RQ_IO_DATA_LEN
147 select BLK_RQ_ALLOC_TIME
149 Enabling this option enables the .weight interface for cost
150 model based proportional IO control. The IO controller
151 distributes IO capacity between different groups based on
152 their share of the overall weight distribution.
154 config BLK_CGROUP_IOPRIO
155 bool "Cgroup I/O controller for assigning an I/O priority class"
156 depends on BLK_CGROUP
158 Enable the .prio interface for assigning an I/O priority class to
159 requests. The I/O priority class affects the order in which an I/O
160 scheduler and block devices process requests. Only some I/O schedulers
161 and some block devices support I/O priorities.
164 bool "Block layer debugging information in debugfs"
168 Include block layer debugging information in debugfs. This information
169 is mostly useful for kernel developers, but it doesn't incur any cost
172 Unless you are building a kernel for a tiny system, you should
175 config BLK_DEBUG_FS_ZONED
177 default BLK_DEBUG_FS && BLK_DEV_ZONED
180 bool "Logic for interfacing with Opal enabled SEDs"
182 Builds Logic for interfacing with Opal enabled controllers.
183 Enabling this option enables users to setup/unlock/lock
184 Locking ranges for SED devices using the Opal protocol.
186 config BLK_INLINE_ENCRYPTION
187 bool "Enable inline encryption support in block layer"
189 Build the blk-crypto subsystem. Enabling this lets the
190 block layer handle encryption, so users can take
191 advantage of inline encryption hardware if present.
193 config BLK_INLINE_ENCRYPTION_FALLBACK
194 bool "Enable crypto API fallback for blk-crypto"
195 depends on BLK_INLINE_ENCRYPTION
197 select CRYPTO_SKCIPHER
199 Enabling this lets the block layer handle inline encryption
200 by falling back to the kernel crypto API when inline
201 encryption hardware is not present.
203 menu "Partition Types"
205 source "block/partitions/Kconfig"
213 depends on BLOCK && COMPAT
218 depends on BLOCK && PCI
223 depends on BLOCK && VIRTIO
228 depends on BLOCK && INFINIBAND
234 source "block/Kconfig.iosched"