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_SCSI_REQUEST
33 bool "Block layer SG support v4"
35 select BLK_SCSI_REQUEST
37 Saying Y here will enable generic SG (SCSI generic) v4 support
40 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
41 can handle complicated SCSI commands: tagged variable length cdbs
42 with bidirectional data transfers and generic request/response
43 protocols (e.g. Task Management Functions and SMP in Serial
46 This option is required by recent UDEV versions to properly
47 access device serial numbers, etc.
52 bool "Block layer SG support v4 helper lib"
54 select BLK_SCSI_REQUEST
56 Subsystems will normally enable this if needed. Users will not
57 normally need to manually enable this.
61 config BLK_DEV_INTEGRITY
62 bool "Block layer data integrity support"
63 select CRC_T10DIF if BLK_DEV_INTEGRITY
65 Some storage devices allow extra information to be
66 stored/retrieved to help protect the data. The block layer
67 data integrity option provides hooks which can be used by
68 filesystems to ensure better data integrity.
70 Say yes here if you have a storage device that provides the
71 T10/SCSI Data Integrity Field or the T13/ATA External Path
72 Protection. If in doubt, say N.
75 bool "Zoned block device support"
76 select MQ_IOSCHED_DEADLINE
78 Block layer zoned block device support. This option enables
79 support for ZAC/ZBC host-managed and host-aware zoned block devices.
81 Say yes here if you have a ZAC or ZBC storage device.
83 config BLK_DEV_THROTTLING
84 bool "Block layer bio throttling support"
85 depends on BLK_CGROUP=y
87 Block layer bio throttling support. It can be used to limit
88 the IO rate to a device. IO rate policies are per cgroup and
89 one needs to mount and use blkio cgroup controller for creating
90 cgroups and specifying per device IO rate policies.
92 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
94 config BLK_DEV_THROTTLING_LOW
95 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
96 depends on BLK_DEV_THROTTLING
98 Add .low limit interface for block throttling. The low limit is a best
99 effort limit to prioritize cgroups. Depending on the setting, the limit
100 can be used to protect cgroups in terms of bandwidth/iops and better
101 utilize disk resource.
103 Note, this is an experimental interface and could be changed someday.
105 config BLK_CMDLINE_PARSER
106 bool "Block device command line partition parser"
108 Enabling this option allows you to specify the partition layout from
109 the kernel boot args. This is typically of use for embedded devices
110 which don't otherwise have any standardized method for listing the
111 partitions on a block device.
113 See Documentation/block/cmdline-partition.rst for more information.
116 bool "Enable support for block device writeback throttling"
118 Enabling this option enables the block layer to throttle buffered
119 background writeback from the VM, making it more smooth and having
120 less impact on foreground operations. The throttling is done
121 dynamically on an algorithm loosely based on CoDel, factoring in
122 the realtime performance of the disk.
124 config BLK_CGROUP_IOLATENCY
125 bool "Enable support for latency based cgroup IO protection"
126 depends on BLK_CGROUP=y
128 Enabling this option enables the .latency interface for IO throttling.
129 The IO controller will attempt to maintain average IO latencies below
130 the configured latency target, throttling anybody with a higher latency
131 target than the victimized group.
133 Note, this is an experimental interface and could be changed someday.
136 bool "Multiqueue writeback throttling"
140 Enable writeback throttling by default on multiqueue devices.
141 Multiqueue currently doesn't have support for IO scheduling,
142 enabling this option is recommended.
145 bool "Block layer debugging information in debugfs"
149 Include block layer debugging information in debugfs. This information
150 is mostly useful for kernel developers, but it doesn't incur any cost
153 Unless you are building a kernel for a tiny system, you should
156 config BLK_DEBUG_FS_ZONED
158 default BLK_DEBUG_FS && BLK_DEV_ZONED
161 bool "Logic for interfacing with Opal enabled SEDs"
163 Builds Logic for interfacing with Opal enabled controllers.
164 Enabling this option enables users to setup/unlock/lock
165 Locking ranges for SED devices using the Opal protocol.
167 menu "Partition Types"
169 source "block/partitions/Kconfig"
177 depends on BLOCK && COMPAT
182 depends on BLOCK && PCI
187 depends on BLOCK && VIRTIO
192 depends on BLOCK && INFINIBAND
198 source "block/Kconfig.iosched"