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
30 bool "Support for large (2TB+) block devices and files"
34 Enable block devices or files of size 2TB and larger.
36 This option is required to support the full capacity of large
37 (2TB+) block devices, including RAID, disk, Network Block Device,
38 Logical Volume Manager (LVM) and loopback.
40 This option also enables support for single files larger than
43 The ext4 filesystem requires that this feature be enabled in
44 order to support filesystems that have the huge_file feature
45 enabled. Otherwise, it will refuse to mount in the read-write
46 mode any filesystems that use the huge_file feature, which is
47 enabled by default by mke2fs.ext4.
49 The GFS2 filesystem also requires this feature.
53 config BLK_SCSI_REQUEST
57 bool "Block layer SG support v4"
59 select BLK_SCSI_REQUEST
61 Saying Y here will enable generic SG (SCSI generic) v4 support
64 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
65 can handle complicated SCSI commands: tagged variable length cdbs
66 with bidirectional data transfers and generic request/response
67 protocols (e.g. Task Management Functions and SMP in Serial
70 This option is required by recent UDEV versions to properly
71 access device serial numbers, etc.
76 bool "Block layer SG support v4 helper lib"
78 select BLK_SCSI_REQUEST
80 Subsystems will normally enable this if needed. Users will not
81 normally need to manually enable this.
85 config BLK_DEV_INTEGRITY
86 bool "Block layer data integrity support"
87 select CRC_T10DIF if BLK_DEV_INTEGRITY
89 Some storage devices allow extra information to be
90 stored/retrieved to help protect the data. The block layer
91 data integrity option provides hooks which can be used by
92 filesystems to ensure better data integrity.
94 Say yes here if you have a storage device that provides the
95 T10/SCSI Data Integrity Field or the T13/ATA External Path
96 Protection. If in doubt, say N.
99 bool "Zoned block device support"
101 Block layer zoned block device support. This option enables
102 support for ZAC/ZBC host-managed and host-aware zoned block devices.
104 Say yes here if you have a ZAC or ZBC storage device.
106 config BLK_DEV_THROTTLING
107 bool "Block layer bio throttling support"
108 depends on BLK_CGROUP=y
110 Block layer bio throttling support. It can be used to limit
111 the IO rate to a device. IO rate policies are per cgroup and
112 one needs to mount and use blkio cgroup controller for creating
113 cgroups and specifying per device IO rate policies.
115 See Documentation/cgroup-v1/blkio-controller.txt for more information.
117 config BLK_DEV_THROTTLING_LOW
118 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
119 depends on BLK_DEV_THROTTLING
121 Add .low limit interface for block throttling. The low limit is a best
122 effort limit to prioritize cgroups. Depending on the setting, the limit
123 can be used to protect cgroups in terms of bandwidth/iops and better
124 utilize disk resource.
126 Note, this is an experimental interface and could be changed someday.
128 config BLK_CMDLINE_PARSER
129 bool "Block device command line partition parser"
131 Enabling this option allows you to specify the partition layout from
132 the kernel boot args. This is typically of use for embedded devices
133 which don't otherwise have any standardized method for listing the
134 partitions on a block device.
136 See Documentation/block/cmdline-partition.txt for more information.
139 bool "Enable support for block device writeback throttling"
141 Enabling this option enables the block layer to throttle buffered
142 background writeback from the VM, making it more smooth and having
143 less impact on foreground operations. The throttling is done
144 dynamically on an algorithm loosely based on CoDel, factoring in
145 the realtime performance of the disk.
147 config BLK_CGROUP_IOLATENCY
148 bool "Enable support for latency based cgroup IO protection"
149 depends on BLK_CGROUP=y
151 Enabling this option enables the .latency interface for IO throttling.
152 The IO controller will attempt to maintain average IO latencies below
153 the configured latency target, throttling anybody with a higher latency
154 target than the victimized group.
156 Note, this is an experimental interface and could be changed someday.
159 bool "Multiqueue writeback throttling"
163 Enable writeback throttling by default on multiqueue devices.
164 Multiqueue currently doesn't have support for IO scheduling,
165 enabling this option is recommended.
168 bool "Block layer debugging information in debugfs"
172 Include block layer debugging information in debugfs. This information
173 is mostly useful for kernel developers, but it doesn't incur any cost
176 Unless you are building a kernel for a tiny system, you should
179 config BLK_DEBUG_FS_ZONED
181 default BLK_DEBUG_FS && BLK_DEV_ZONED
184 bool "Logic for interfacing with Opal enabled SEDs"
186 Builds Logic for interfacing with Opal enabled controllers.
187 Enabling this option enables users to setup/unlock/lock
188 Locking ranges for SED devices using the Opal protocol.
190 menu "Partition Types"
192 source "block/partitions/Kconfig"
200 depends on BLOCK && COMPAT
205 depends on BLOCK && PCI
210 depends on BLOCK && VIRTIO
215 depends on BLOCK && INFINIBAND
221 source "block/Kconfig.iosched"