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1# SPDX-License-Identifier: GPL-2.0
2#
3# Block layer core configuration
4#
5menuconfig BLOCK
6 bool "Enable the block layer" if EXPERT
7 default y
8 select SBITMAP
9 select SRCU
10 help
11 Provide block layer support for the kernel.
12
13 Disable this option to remove the block layer support from the
14 kernel. This may be useful for embedded devices.
15
16 If this option is disabled:
17
18 - block device files will become unusable
19 - some filesystems (such as ext3) will become unavailable.
20
21 Also, SCSI character devices and USB storage will be disabled since
22 they make use of various block layer definitions and facilities.
23
24 Say Y here unless you know you really don't want to mount disks and
25 suchlike.
26
27if BLOCK
28
29config LBDAF
30 bool "Support for large (2TB+) block devices and files"
31 depends on !64BIT
32 default y
33 help
34 Enable block devices or files of size 2TB and larger.
35
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.
39
40 This option also enables support for single files larger than
41 2TB.
42
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.
48
49 The GFS2 filesystem also requires this feature.
50
51 If unsure, say Y.
52
53config BLK_SCSI_REQUEST
54 bool
55
56config BLK_DEV_BSG
57 bool "Block layer SG support v4"
58 default y
59 select BLK_SCSI_REQUEST
60 help
61 Saying Y here will enable generic SG (SCSI generic) v4 support
62 for any block device.
63
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
68 Attached SCSI).
69
70 This option is required by recent UDEV versions to properly
71 access device serial numbers, etc.
72
73 If unsure, say Y.
74
75config BLK_DEV_BSGLIB
76 bool "Block layer SG support v4 helper lib"
77 default n
78 select BLK_DEV_BSG
79 select BLK_SCSI_REQUEST
80 help
81 Subsystems will normally enable this if needed. Users will not
82 normally need to manually enable this.
83
84 If unsure, say N.
85
86config BLK_DEV_INTEGRITY
87 bool "Block layer data integrity support"
88 select CRC_T10DIF if BLK_DEV_INTEGRITY
89 ---help---
90 Some storage devices allow extra information to be
91 stored/retrieved to help protect the data. The block layer
92 data integrity option provides hooks which can be used by
93 filesystems to ensure better data integrity.
94
95 Say yes here if you have a storage device that provides the
96 T10/SCSI Data Integrity Field or the T13/ATA External Path
97 Protection. If in doubt, say N.
98
99config BLK_DEV_ZONED
100 bool "Zoned block device support"
101 ---help---
102 Block layer zoned block device support. This option enables
103 support for ZAC/ZBC host-managed and host-aware zoned block devices.
104
105 Say yes here if you have a ZAC or ZBC storage device.
106
107config BLK_DEV_THROTTLING
108 bool "Block layer bio throttling support"
109 depends on BLK_CGROUP=y
110 default n
111 ---help---
112 Block layer bio throttling support. It can be used to limit
113 the IO rate to a device. IO rate policies are per cgroup and
114 one needs to mount and use blkio cgroup controller for creating
115 cgroups and specifying per device IO rate policies.
116
117 See Documentation/cgroups/blkio-controller.txt for more information.
118
119config BLK_DEV_THROTTLING_LOW
120 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
121 depends on BLK_DEV_THROTTLING
122 default n
123 ---help---
124 Add .low limit interface for block throttling. The low limit is a best
125 effort limit to prioritize cgroups. Depending on the setting, the limit
126 can be used to protect cgroups in terms of bandwidth/iops and better
127 utilize disk resource.
128
129 Note, this is an experimental interface and could be changed someday.
130
131config BLK_CMDLINE_PARSER
132 bool "Block device command line partition parser"
133 default n
134 ---help---
135 Enabling this option allows you to specify the partition layout from
136 the kernel boot args. This is typically of use for embedded devices
137 which don't otherwise have any standardized method for listing the
138 partitions on a block device.
139
140 See Documentation/block/cmdline-partition.txt for more information.
141
142config BLK_WBT
143 bool "Enable support for block device writeback throttling"
144 default n
145 ---help---
146 Enabling this option enables the block layer to throttle buffered
147 background writeback from the VM, making it more smooth and having
148 less impact on foreground operations. The throttling is done
149 dynamically on an algorithm loosely based on CoDel, factoring in
150 the realtime performance of the disk.
151
152config BLK_WBT_SQ
153 bool "Single queue writeback throttling"
154 default n
155 depends on BLK_WBT
156 ---help---
157 Enable writeback throttling by default on legacy single queue devices
158
159config BLK_WBT_MQ
160 bool "Multiqueue writeback throttling"
161 default y
162 depends on BLK_WBT
163 ---help---
164 Enable writeback throttling by default on multiqueue devices.
165 Multiqueue currently doesn't have support for IO scheduling,
166 enabling this option is recommended.
167
168config BLK_DEBUG_FS
169 bool "Block layer debugging information in debugfs"
170 default y
171 depends on DEBUG_FS
172 ---help---
173 Include block layer debugging information in debugfs. This information
174 is mostly useful for kernel developers, but it doesn't incur any cost
175 at runtime.
176
177 Unless you are building a kernel for a tiny system, you should
178 say Y here.
179
180config BLK_SED_OPAL
181 bool "Logic for interfacing with Opal enabled SEDs"
182 ---help---
183 Builds Logic for interfacing with Opal enabled controllers.
184 Enabling this option enables users to setup/unlock/lock
185 Locking ranges for SED devices using the Opal protocol.
186
187menu "Partition Types"
188
189source "block/partitions/Kconfig"
190
191endmenu
192
193endif # BLOCK
194
195config BLOCK_COMPAT
196 bool
197 depends on BLOCK && COMPAT
198 default y
199
200config BLK_MQ_PCI
201 bool
202 depends on BLOCK && PCI
203 default y
204
205config BLK_MQ_VIRTIO
206 bool
207 depends on BLOCK && VIRTIO
208 default y
209
210config BLK_MQ_RDMA
211 bool
212 depends on BLOCK && INFINIBAND
213 default y
214
215source block/Kconfig.iosched
1# SPDX-License-Identifier: GPL-2.0
2#
3# Block layer core configuration
4#
5menuconfig BLOCK
6 bool "Enable the block layer" if EXPERT
7 default y
8 select SBITMAP
9 select SRCU
10 help
11 Provide block layer support for the kernel.
12
13 Disable this option to remove the block layer support from the
14 kernel. This may be useful for embedded devices.
15
16 If this option is disabled:
17
18 - block device files will become unusable
19 - some filesystems (such as ext3) will become unavailable.
20
21 Also, SCSI character devices and USB storage will be disabled since
22 they make use of various block layer definitions and facilities.
23
24 Say Y here unless you know you really don't want to mount disks and
25 suchlike.
26
27if BLOCK
28
29config BLK_RQ_ALLOC_TIME
30 bool
31
32config BLK_SCSI_REQUEST
33 bool
34
35config BLK_CGROUP_RWSTAT
36 bool
37
38config BLK_DEV_BSG
39 bool "Block layer SG support v4"
40 default y
41 select BLK_SCSI_REQUEST
42 help
43 Saying Y here will enable generic SG (SCSI generic) v4 support
44 for any block device.
45
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
50 Attached SCSI).
51
52 This option is required by recent UDEV versions to properly
53 access device serial numbers, etc.
54
55 If unsure, say Y.
56
57config BLK_DEV_BSGLIB
58 bool "Block layer SG support v4 helper lib"
59 select BLK_DEV_BSG
60 select BLK_SCSI_REQUEST
61 help
62 Subsystems will normally enable this if needed. Users will not
63 normally need to manually enable this.
64
65 If unsure, say N.
66
67config BLK_DEV_INTEGRITY
68 bool "Block layer data integrity support"
69 help
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.
74
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.
78
79config BLK_DEV_INTEGRITY_T10
80 tristate
81 depends on BLK_DEV_INTEGRITY
82 select CRC_T10DIF
83
84config BLK_DEV_ZONED
85 bool "Zoned block device support"
86 select MQ_IOSCHED_DEADLINE
87 help
88 Block layer zoned block device support. This option enables
89 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
90 devices.
91
92 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
93
94config BLK_DEV_THROTTLING
95 bool "Block layer bio throttling support"
96 depends on BLK_CGROUP=y
97 select BLK_CGROUP_RWSTAT
98 help
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.
103
104 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
105
106config BLK_DEV_THROTTLING_LOW
107 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
108 depends on BLK_DEV_THROTTLING
109 help
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.
114
115 Note, this is an experimental interface and could be changed someday.
116
117config BLK_CMDLINE_PARSER
118 bool "Block device command line partition parser"
119 help
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.
124
125 See Documentation/block/cmdline-partition.rst for more information.
126
127config BLK_WBT
128 bool "Enable support for block device writeback throttling"
129 help
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.
135
136config BLK_CGROUP_IOLATENCY
137 bool "Enable support for latency based cgroup IO protection"
138 depends on BLK_CGROUP=y
139 help
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.
144
145 Note, this is an experimental interface and could be changed someday.
146
147config 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
152 help
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.
157
158config BLK_WBT_MQ
159 bool "Multiqueue writeback throttling"
160 default y
161 depends on BLK_WBT
162 help
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.
166
167config BLK_DEBUG_FS
168 bool "Block layer debugging information in debugfs"
169 default y
170 depends on DEBUG_FS
171 help
172 Include block layer debugging information in debugfs. This information
173 is mostly useful for kernel developers, but it doesn't incur any cost
174 at runtime.
175
176 Unless you are building a kernel for a tiny system, you should
177 say Y here.
178
179config BLK_DEBUG_FS_ZONED
180 bool
181 default BLK_DEBUG_FS && BLK_DEV_ZONED
182
183config BLK_SED_OPAL
184 bool "Logic for interfacing with Opal enabled SEDs"
185 help
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.
189
190config BLK_INLINE_ENCRYPTION
191 bool "Enable inline encryption support in block layer"
192 help
193 Build the blk-crypto subsystem. Enabling this lets the
194 block layer handle encryption, so users can take
195 advantage of inline encryption hardware if present.
196
197config BLK_INLINE_ENCRYPTION_FALLBACK
198 bool "Enable crypto API fallback for blk-crypto"
199 depends on BLK_INLINE_ENCRYPTION
200 select CRYPTO
201 select CRYPTO_SKCIPHER
202 help
203 Enabling this lets the block layer handle inline encryption
204 by falling back to the kernel crypto API when inline
205 encryption hardware is not present.
206
207menu "Partition Types"
208
209source "block/partitions/Kconfig"
210
211endmenu
212
213endif # BLOCK
214
215config BLOCK_COMPAT
216 bool
217 depends on BLOCK && COMPAT
218 default y
219
220config BLK_MQ_PCI
221 bool
222 depends on BLOCK && PCI
223 default y
224
225config BLK_MQ_VIRTIO
226 bool
227 depends on BLOCK && VIRTIO
228 default y
229
230config BLK_MQ_RDMA
231 bool
232 depends on BLOCK && INFINIBAND
233 default y
234
235config BLK_PM
236 def_bool BLOCK && PM
237
238source "block/Kconfig.iosched"