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