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