1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # Block layer core configuration 3 # Block layer core configuration
4 # 4 #
5 menuconfig BLOCK 5 menuconfig BLOCK
6 bool "Enable the block layer" if EXPERT 6 bool "Enable the block layer" if EXPERT
7 default y 7 default y
8 select FS_IOMAP 8 select FS_IOMAP
9 select SBITMAP 9 select SBITMAP
10 help 10 help
11 Provide block layer support for the k 11 Provide block layer support for the kernel.
12 12
13 Disable this option to remove the blo 13 Disable this option to remove the block layer support from the
14 kernel. This may be useful for embedd 14 kernel. This may be useful for embedded devices.
15 15
16 If this option is disabled: 16 If this option is disabled:
17 17
18 - block device files will become un 18 - block device files will become unusable
19 - some filesystems (such as ext3) w 19 - some filesystems (such as ext3) will become unavailable.
20 20
21 Also, SCSI character devices and USB 21 Also, SCSI character devices and USB storage will be disabled since
22 they make use of various block layer 22 they make use of various block layer definitions and facilities.
23 23
24 Say Y here unless you know you really 24 Say Y here unless you know you really don't want to mount disks and
25 suchlike. 25 suchlike.
26 26
27 if BLOCK 27 if BLOCK
28 28
29 config BLOCK_LEGACY_AUTOLOAD 29 config BLOCK_LEGACY_AUTOLOAD
30 bool "Legacy autoloading support" 30 bool "Legacy autoloading support"
31 default y 31 default y
32 help 32 help
33 Enable loading modules and creating 33 Enable loading modules and creating block device instances based on
34 accesses through their device specia 34 accesses through their device special file. This is a historic Linux
35 feature and makes no sense in a udev 35 feature and makes no sense in a udev world where device files are
36 created on demand, but scripts that 36 created on demand, but scripts that manually create device nodes and
37 then call losetup might rely on this 37 then call losetup might rely on this behavior.
38 38
39 config BLK_RQ_ALLOC_TIME 39 config BLK_RQ_ALLOC_TIME
40 bool 40 bool
41 41
42 config BLK_CGROUP_RWSTAT 42 config BLK_CGROUP_RWSTAT
43 bool 43 bool
44 44
45 config BLK_CGROUP_PUNT_BIO 45 config BLK_CGROUP_PUNT_BIO
46 bool 46 bool
47 47
48 config BLK_DEV_BSG_COMMON 48 config BLK_DEV_BSG_COMMON
49 tristate 49 tristate
50 50
51 config BLK_ICQ 51 config BLK_ICQ
52 bool 52 bool
53 53
54 config BLK_DEV_BSGLIB 54 config BLK_DEV_BSGLIB
55 bool "Block layer SG support v4 helper 55 bool "Block layer SG support v4 helper lib"
56 select BLK_DEV_BSG_COMMON 56 select BLK_DEV_BSG_COMMON
57 help 57 help
58 Subsystems will normally enable this 58 Subsystems will normally enable this if needed. Users will not
59 normally need to manually enable thi 59 normally need to manually enable this.
60 60
61 If unsure, say N. 61 If unsure, say N.
62 62
63 config BLK_DEV_INTEGRITY 63 config BLK_DEV_INTEGRITY
64 bool "Block layer data integrity suppo 64 bool "Block layer data integrity support"
65 select CRC_T10DIF <<
66 select CRC64_ROCKSOFT <<
67 help 65 help
68 Some storage devices allow extra infor 66 Some storage devices allow extra information to be
69 stored/retrieved to help protect the d 67 stored/retrieved to help protect the data. The block layer
70 data integrity option provides hooks w 68 data integrity option provides hooks which can be used by
71 filesystems to ensure better data inte 69 filesystems to ensure better data integrity.
72 70
73 Say yes here if you have a storage dev 71 Say yes here if you have a storage device that provides the
74 T10/SCSI Data Integrity Field or the T 72 T10/SCSI Data Integrity Field or the T13/ATA External Path
75 Protection. If in doubt, say N. 73 Protection. If in doubt, say N.
76 74
77 config BLK_DEV_WRITE_MOUNTED !! 75 config BLK_DEV_INTEGRITY_T10
78 bool "Allow writing to mounted block d !! 76 tristate
79 default y !! 77 depends on BLK_DEV_INTEGRITY
80 help !! 78 select CRC_T10DIF
81 When a block device is mounted, writin !! 79 select CRC64_ROCKSOFT
82 likely going to cause filesystem corru <<
83 crash the kernel in this way since the <<
84 of detecting these writes to buffer ca <<
85 integrity. However there are some setu <<
86 like running fsck on read-only mounted <<
87 features on mounted ext4 filesystem, a <<
88 kernel will prevent processes from wri <<
89 mounted by filesystems which provides <<
90 privileged processes and generally mak <<
91 filesystem drivers. Note however that <<
92 underlying device(s) from being modifi <<
93 directly submitting SCSI commands or t <<
94 storage stack. If in doubt, say Y. The <<
95 with the bdev_allow_write_mounted boot <<
96 80
97 config BLK_DEV_ZONED 81 config BLK_DEV_ZONED
98 bool "Zoned block device support" 82 bool "Zoned block device support"
>> 83 select MQ_IOSCHED_DEADLINE
99 help 84 help
100 Block layer zoned block device support 85 Block layer zoned block device support. This option enables
101 support for ZAC/ZBC/ZNS host-managed a 86 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
102 devices. 87 devices.
103 88
104 Say yes here if you have a ZAC, ZBC, o 89 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
105 90
106 config BLK_DEV_THROTTLING 91 config BLK_DEV_THROTTLING
107 bool "Block layer bio throttling suppo 92 bool "Block layer bio throttling support"
108 depends on BLK_CGROUP 93 depends on BLK_CGROUP
109 select BLK_CGROUP_RWSTAT 94 select BLK_CGROUP_RWSTAT
110 help 95 help
111 Block layer bio throttling support. It 96 Block layer bio throttling support. It can be used to limit
112 the IO rate to a device. IO rate polic 97 the IO rate to a device. IO rate policies are per cgroup and
113 one needs to mount and use blkio cgrou 98 one needs to mount and use blkio cgroup controller for creating
114 cgroups and specifying per device IO r 99 cgroups and specifying per device IO rate policies.
115 100
116 See Documentation/admin-guide/cgroup-v 101 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
117 102
>> 103 config BLK_DEV_THROTTLING_LOW
>> 104 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
>> 105 depends on BLK_DEV_THROTTLING
>> 106 help
>> 107 Add .low limit interface for block throttling. The low limit is a best
>> 108 effort limit to prioritize cgroups. Depending on the setting, the limit
>> 109 can be used to protect cgroups in terms of bandwidth/iops and better
>> 110 utilize disk resource.
>> 111
>> 112 Note, this is an experimental interface and could be changed someday.
>> 113
118 config BLK_WBT 114 config BLK_WBT
119 bool "Enable support for block device 115 bool "Enable support for block device writeback throttling"
120 help 116 help
121 Enabling this option enables the block 117 Enabling this option enables the block layer to throttle buffered
122 background writeback from the VM, maki 118 background writeback from the VM, making it more smooth and having
123 less impact on foreground operations. 119 less impact on foreground operations. The throttling is done
124 dynamically on an algorithm loosely ba 120 dynamically on an algorithm loosely based on CoDel, factoring in
125 the realtime performance of the disk. 121 the realtime performance of the disk.
126 122
127 config BLK_WBT_MQ 123 config BLK_WBT_MQ
128 bool "Enable writeback throttling by d 124 bool "Enable writeback throttling by default"
129 default y 125 default y
130 depends on BLK_WBT 126 depends on BLK_WBT
131 help 127 help
132 Enable writeback throttling by default 128 Enable writeback throttling by default for request-based block devices.
133 129
134 config BLK_CGROUP_IOLATENCY 130 config BLK_CGROUP_IOLATENCY
135 bool "Enable support for latency based 131 bool "Enable support for latency based cgroup IO protection"
136 depends on BLK_CGROUP 132 depends on BLK_CGROUP
137 help 133 help
138 Enabling this option enables the .late 134 Enabling this option enables the .latency interface for IO throttling.
139 The IO controller will attempt to main 135 The IO controller will attempt to maintain average IO latencies below
140 the configured latency target, throttl 136 the configured latency target, throttling anybody with a higher latency
141 target than the victimized group. 137 target than the victimized group.
142 138
143 Note, this is an experimental interfac 139 Note, this is an experimental interface and could be changed someday.
144 140
145 config BLK_CGROUP_FC_APPID 141 config BLK_CGROUP_FC_APPID
146 bool "Enable support to track FC I/O T 142 bool "Enable support to track FC I/O Traffic across cgroup applications"
147 depends on BLK_CGROUP && NVME_FC 143 depends on BLK_CGROUP && NVME_FC
148 help 144 help
149 Enabling this option enables the sup 145 Enabling this option enables the support to track FC I/O traffic across
150 cgroup applications. It enables the 146 cgroup applications. It enables the Fabric and the storage targets to
151 identify, monitor, and handle FC tra 147 identify, monitor, and handle FC traffic based on VM tags by inserting
152 application specific identification 148 application specific identification into the FC frame.
153 149
154 config BLK_CGROUP_IOCOST 150 config BLK_CGROUP_IOCOST
155 bool "Enable support for cost model ba 151 bool "Enable support for cost model based cgroup IO controller"
156 depends on BLK_CGROUP 152 depends on BLK_CGROUP
157 select BLK_RQ_ALLOC_TIME 153 select BLK_RQ_ALLOC_TIME
158 help 154 help
159 Enabling this option enables the .weig 155 Enabling this option enables the .weight interface for cost
160 model based proportional IO control. 156 model based proportional IO control. The IO controller
161 distributes IO capacity between differ 157 distributes IO capacity between different groups based on
162 their share of the overall weight dist 158 their share of the overall weight distribution.
163 159
164 config BLK_CGROUP_IOPRIO 160 config BLK_CGROUP_IOPRIO
165 bool "Cgroup I/O controller for assign 161 bool "Cgroup I/O controller for assigning an I/O priority class"
166 depends on BLK_CGROUP 162 depends on BLK_CGROUP
167 help 163 help
168 Enable the .prio interface for assigni 164 Enable the .prio interface for assigning an I/O priority class to
169 requests. The I/O priority class affec 165 requests. The I/O priority class affects the order in which an I/O
170 scheduler and block devices process re 166 scheduler and block devices process requests. Only some I/O schedulers
171 and some block devices support I/O pri 167 and some block devices support I/O priorities.
172 168
173 config BLK_DEBUG_FS 169 config BLK_DEBUG_FS
174 bool "Block layer debugging informatio 170 bool "Block layer debugging information in debugfs"
175 default y 171 default y
176 depends on DEBUG_FS 172 depends on DEBUG_FS
177 help 173 help
178 Include block layer debugging informat 174 Include block layer debugging information in debugfs. This information
179 is mostly useful for kernel developers 175 is mostly useful for kernel developers, but it doesn't incur any cost
180 at runtime. 176 at runtime.
181 177
182 Unless you are building a kernel for a 178 Unless you are building a kernel for a tiny system, you should
183 say Y here. 179 say Y here.
184 180
>> 181 config BLK_DEBUG_FS_ZONED
>> 182 bool
>> 183 default BLK_DEBUG_FS && BLK_DEV_ZONED
>> 184
185 config BLK_SED_OPAL 185 config BLK_SED_OPAL
186 bool "Logic for interfacing with Opal 186 bool "Logic for interfacing with Opal enabled SEDs"
187 depends on KEYS 187 depends on KEYS
188 select PSERIES_PLPKS if PPC_PSERIES 188 select PSERIES_PLPKS if PPC_PSERIES
189 select PSERIES_PLPKS_SED if PPC_PSERIE <<
190 help 189 help
191 Builds Logic for interfacing with Opal 190 Builds Logic for interfacing with Opal enabled controllers.
192 Enabling this option enables users to 191 Enabling this option enables users to setup/unlock/lock
193 Locking ranges for SED devices using t 192 Locking ranges for SED devices using the Opal protocol.
194 193
195 config BLK_INLINE_ENCRYPTION 194 config BLK_INLINE_ENCRYPTION
196 bool "Enable inline encryption support 195 bool "Enable inline encryption support in block layer"
197 help 196 help
198 Build the blk-crypto subsystem. Enab 197 Build the blk-crypto subsystem. Enabling this lets the
199 block layer handle encryption, so us 198 block layer handle encryption, so users can take
200 advantage of inline encryption hardw 199 advantage of inline encryption hardware if present.
201 200
202 config BLK_INLINE_ENCRYPTION_FALLBACK 201 config BLK_INLINE_ENCRYPTION_FALLBACK
203 bool "Enable crypto API fallback for b 202 bool "Enable crypto API fallback for blk-crypto"
204 depends on BLK_INLINE_ENCRYPTION 203 depends on BLK_INLINE_ENCRYPTION
205 select CRYPTO 204 select CRYPTO
206 select CRYPTO_SKCIPHER 205 select CRYPTO_SKCIPHER
207 help 206 help
208 Enabling this lets the block layer h 207 Enabling this lets the block layer handle inline encryption
209 by falling back to the kernel crypto 208 by falling back to the kernel crypto API when inline
210 encryption hardware is not present. 209 encryption hardware is not present.
211 210
212 source "block/partitions/Kconfig" 211 source "block/partitions/Kconfig"
213 212
214 config BLK_MQ_PCI 213 config BLK_MQ_PCI
215 def_bool PCI 214 def_bool PCI
216 215
217 config BLK_MQ_VIRTIO 216 config BLK_MQ_VIRTIO
218 bool 217 bool
219 depends on VIRTIO 218 depends on VIRTIO
220 default y 219 default y
221 220
222 config BLK_PM 221 config BLK_PM
223 def_bool PM 222 def_bool PM
224 223
225 # do not use in new code 224 # do not use in new code
226 config BLOCK_HOLDER_DEPRECATED 225 config BLOCK_HOLDER_DEPRECATED
227 bool 226 bool
228 227
229 config BLK_MQ_STACKING 228 config BLK_MQ_STACKING
230 bool 229 bool
231 230
232 source "block/Kconfig.iosched" 231 source "block/Kconfig.iosched"
233 232
234 endif # BLOCK 233 endif # BLOCK
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