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 <<
9 select SBITMAP 8 select SBITMAP
>> 9 select SRCU
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 <<
30 bool "Legacy autoloading support" <<
31 default y <<
32 help <<
33 Enable loading modules and creating <<
34 accesses through their device specia <<
35 feature and makes no sense in a udev <<
36 created on demand, but scripts that <<
37 then call losetup might rely on this <<
38 <<
39 config BLK_RQ_ALLOC_TIME 29 config BLK_RQ_ALLOC_TIME
40 bool 30 bool
41 31
42 config BLK_CGROUP_RWSTAT !! 32 config BLK_SCSI_REQUEST
43 bool 33 bool
44 34
45 config BLK_CGROUP_PUNT_BIO !! 35 config BLK_CGROUP_RWSTAT
46 bool 36 bool
47 37
48 config BLK_DEV_BSG_COMMON !! 38 config BLK_DEV_BSG
49 tristate !! 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.
50 45
51 config BLK_ICQ !! 46 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
52 bool !! 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.
53 56
54 config BLK_DEV_BSGLIB 57 config BLK_DEV_BSGLIB
55 bool "Block layer SG support v4 helper 58 bool "Block layer SG support v4 helper lib"
56 select BLK_DEV_BSG_COMMON !! 59 select BLK_DEV_BSG
>> 60 select BLK_SCSI_REQUEST
57 help 61 help
58 Subsystems will normally enable this 62 Subsystems will normally enable this if needed. Users will not
59 normally need to manually enable thi 63 normally need to manually enable this.
60 64
61 If unsure, say N. 65 If unsure, say N.
62 66
63 config BLK_DEV_INTEGRITY 67 config BLK_DEV_INTEGRITY
64 bool "Block layer data integrity suppo 68 bool "Block layer data integrity support"
65 select CRC_T10DIF <<
66 select CRC64_ROCKSOFT <<
67 help 69 help
68 Some storage devices allow extra infor 70 Some storage devices allow extra information to be
69 stored/retrieved to help protect the d 71 stored/retrieved to help protect the data. The block layer
70 data integrity option provides hooks w 72 data integrity option provides hooks which can be used by
71 filesystems to ensure better data inte 73 filesystems to ensure better data integrity.
72 74
73 Say yes here if you have a storage dev 75 Say yes here if you have a storage device that provides the
74 T10/SCSI Data Integrity Field or the T 76 T10/SCSI Data Integrity Field or the T13/ATA External Path
75 Protection. If in doubt, say N. 77 Protection. If in doubt, say N.
76 78
77 config BLK_DEV_WRITE_MOUNTED !! 79 config BLK_DEV_INTEGRITY_T10
78 bool "Allow writing to mounted block d !! 80 tristate
79 default y !! 81 depends on BLK_DEV_INTEGRITY
80 help !! 82 select CRC_T10DIF
81 When a block device is mounted, writin <<
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 83
97 config BLK_DEV_ZONED 84 config BLK_DEV_ZONED
98 bool "Zoned block device support" 85 bool "Zoned block device support"
>> 86 select MQ_IOSCHED_DEADLINE
99 help 87 help
100 Block layer zoned block device support 88 Block layer zoned block device support. This option enables
101 support for ZAC/ZBC/ZNS host-managed a 89 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
102 devices. 90 devices.
103 91
104 Say yes here if you have a ZAC, ZBC, o 92 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
105 93
106 config BLK_DEV_THROTTLING 94 config BLK_DEV_THROTTLING
107 bool "Block layer bio throttling suppo 95 bool "Block layer bio throttling support"
108 depends on BLK_CGROUP !! 96 depends on BLK_CGROUP=y
109 select BLK_CGROUP_RWSTAT 97 select BLK_CGROUP_RWSTAT
110 help 98 help
111 Block layer bio throttling support. It 99 Block layer bio throttling support. It can be used to limit
112 the IO rate to a device. IO rate polic 100 the IO rate to a device. IO rate policies are per cgroup and
113 one needs to mount and use blkio cgrou 101 one needs to mount and use blkio cgroup controller for creating
114 cgroups and specifying per device IO r 102 cgroups and specifying per device IO rate policies.
115 103
116 See Documentation/admin-guide/cgroup-v 104 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
117 105
>> 106 config 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
>> 117 config 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
118 config BLK_WBT 127 config BLK_WBT
119 bool "Enable support for block device 128 bool "Enable support for block device writeback throttling"
120 help 129 help
121 Enabling this option enables the block 130 Enabling this option enables the block layer to throttle buffered
122 background writeback from the VM, maki 131 background writeback from the VM, making it more smooth and having
123 less impact on foreground operations. 132 less impact on foreground operations. The throttling is done
124 dynamically on an algorithm loosely ba 133 dynamically on an algorithm loosely based on CoDel, factoring in
125 the realtime performance of the disk. 134 the realtime performance of the disk.
126 135
127 config BLK_WBT_MQ <<
128 bool "Enable writeback throttling by d <<
129 default y <<
130 depends on BLK_WBT <<
131 help <<
132 Enable writeback throttling by default <<
133 <<
134 config BLK_CGROUP_IOLATENCY 136 config BLK_CGROUP_IOLATENCY
135 bool "Enable support for latency based 137 bool "Enable support for latency based cgroup IO protection"
136 depends on BLK_CGROUP !! 138 depends on BLK_CGROUP=y
137 help 139 help
138 Enabling this option enables the .late 140 Enabling this option enables the .latency interface for IO throttling.
139 The IO controller will attempt to main 141 The IO controller will attempt to maintain average IO latencies below
140 the configured latency target, throttl 142 the configured latency target, throttling anybody with a higher latency
141 target than the victimized group. 143 target than the victimized group.
142 144
143 Note, this is an experimental interfac 145 Note, this is an experimental interface and could be changed someday.
144 146
145 config BLK_CGROUP_FC_APPID <<
146 bool "Enable support to track FC I/O T <<
147 depends on BLK_CGROUP && NVME_FC <<
148 help <<
149 Enabling this option enables the sup <<
150 cgroup applications. It enables the <<
151 identify, monitor, and handle FC tra <<
152 application specific identification <<
153 <<
154 config BLK_CGROUP_IOCOST 147 config BLK_CGROUP_IOCOST
155 bool "Enable support for cost model ba 148 bool "Enable support for cost model based cgroup IO controller"
156 depends on BLK_CGROUP !! 149 depends on BLK_CGROUP=y
>> 150 select BLK_RQ_IO_DATA_LEN
157 select BLK_RQ_ALLOC_TIME 151 select BLK_RQ_ALLOC_TIME
158 help 152 help
159 Enabling this option enables the .weig 153 Enabling this option enables the .weight interface for cost
160 model based proportional IO control. 154 model based proportional IO control. The IO controller
161 distributes IO capacity between differ 155 distributes IO capacity between different groups based on
162 their share of the overall weight dist 156 their share of the overall weight distribution.
163 157
164 config BLK_CGROUP_IOPRIO !! 158 config BLK_WBT_MQ
165 bool "Cgroup I/O controller for assign !! 159 bool "Multiqueue writeback throttling"
166 depends on BLK_CGROUP !! 160 default y
167 help !! 161 depends on BLK_WBT
168 Enable the .prio interface for assigni !! 162 help
169 requests. The I/O priority class affec !! 163 Enable writeback throttling by default on multiqueue devices.
170 scheduler and block devices process re !! 164 Multiqueue currently doesn't have support for IO scheduling,
171 and some block devices support I/O pri !! 165 enabling this option is recommended.
172 166
173 config BLK_DEBUG_FS 167 config BLK_DEBUG_FS
174 bool "Block layer debugging informatio 168 bool "Block layer debugging information in debugfs"
175 default y 169 default y
176 depends on DEBUG_FS 170 depends on DEBUG_FS
177 help 171 help
178 Include block layer debugging informat 172 Include block layer debugging information in debugfs. This information
179 is mostly useful for kernel developers 173 is mostly useful for kernel developers, but it doesn't incur any cost
180 at runtime. 174 at runtime.
181 175
182 Unless you are building a kernel for a 176 Unless you are building a kernel for a tiny system, you should
183 say Y here. 177 say Y here.
184 178
>> 179 config BLK_DEBUG_FS_ZONED
>> 180 bool
>> 181 default BLK_DEBUG_FS && BLK_DEV_ZONED
>> 182
185 config BLK_SED_OPAL 183 config BLK_SED_OPAL
186 bool "Logic for interfacing with Opal 184 bool "Logic for interfacing with Opal enabled SEDs"
187 depends on KEYS <<
188 select PSERIES_PLPKS if PPC_PSERIES <<
189 select PSERIES_PLPKS_SED if PPC_PSERIE <<
190 help 185 help
191 Builds Logic for interfacing with Opal 186 Builds Logic for interfacing with Opal enabled controllers.
192 Enabling this option enables users to 187 Enabling this option enables users to setup/unlock/lock
193 Locking ranges for SED devices using t 188 Locking ranges for SED devices using the Opal protocol.
194 189
195 config BLK_INLINE_ENCRYPTION 190 config BLK_INLINE_ENCRYPTION
196 bool "Enable inline encryption support 191 bool "Enable inline encryption support in block layer"
197 help 192 help
198 Build the blk-crypto subsystem. Enab 193 Build the blk-crypto subsystem. Enabling this lets the
199 block layer handle encryption, so us 194 block layer handle encryption, so users can take
200 advantage of inline encryption hardw 195 advantage of inline encryption hardware if present.
201 196
202 config BLK_INLINE_ENCRYPTION_FALLBACK 197 config BLK_INLINE_ENCRYPTION_FALLBACK
203 bool "Enable crypto API fallback for b 198 bool "Enable crypto API fallback for blk-crypto"
204 depends on BLK_INLINE_ENCRYPTION 199 depends on BLK_INLINE_ENCRYPTION
205 select CRYPTO 200 select CRYPTO
206 select CRYPTO_SKCIPHER 201 select CRYPTO_SKCIPHER
207 help 202 help
208 Enabling this lets the block layer h 203 Enabling this lets the block layer handle inline encryption
209 by falling back to the kernel crypto 204 by falling back to the kernel crypto API when inline
210 encryption hardware is not present. 205 encryption hardware is not present.
211 206
>> 207 menu "Partition Types"
>> 208
212 source "block/partitions/Kconfig" 209 source "block/partitions/Kconfig"
213 210
214 config BLK_MQ_PCI !! 211 endmenu
215 def_bool PCI <<
216 212
217 config BLK_MQ_VIRTIO !! 213 endif # BLOCK
>> 214
>> 215 config BLOCK_COMPAT
218 bool 216 bool
219 depends on VIRTIO !! 217 depends on BLOCK && COMPAT
220 default y 218 default y
221 219
222 config BLK_PM !! 220 config BLK_MQ_PCI
223 def_bool PM !! 221 bool
>> 222 depends on BLOCK && PCI
>> 223 default y
224 224
225 # do not use in new code !! 225 config BLK_MQ_VIRTIO
226 config BLOCK_HOLDER_DEPRECATED <<
227 bool 226 bool
>> 227 depends on BLOCK && VIRTIO
>> 228 default y
228 229
229 config BLK_MQ_STACKING !! 230 config BLK_MQ_RDMA
230 bool 231 bool
>> 232 depends on BLOCK && INFINIBAND
>> 233 default y
231 234
232 source "block/Kconfig.iosched" !! 235 config BLK_PM
>> 236 def_bool BLOCK && PM
233 237
234 endif # BLOCK !! 238 source "block/Kconfig.iosched"
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