1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Block layer core configuration
4 #
5 menuconfig BLOCK
6 bool "Enable the block layer" if EXPERT
7 default y
8 select FS_IOMAP
9 select SBITMAP
10 help
11 Provide block layer support for the k
12
13 Disable this option to remove the blo
14 kernel. This may be useful for embedd
15
16 If this option is disabled:
17
18 - block device files will become un
19 - some filesystems (such as ext3) w
20
21 Also, SCSI character devices and USB
22 they make use of various block layer
23
24 Say Y here unless you know you really
25 suchlike.
26
27 if BLOCK
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
40 bool
41
42 config BLK_CGROUP_RWSTAT
43 bool
44
45 config BLK_CGROUP_PUNT_BIO
46 bool
47
48 config BLK_DEV_BSG_COMMON
49 tristate
50
51 config BLK_ICQ
52 bool
53
54 config BLK_DEV_BSGLIB
55 bool "Block layer SG support v4 helper
56 select BLK_DEV_BSG_COMMON
57 help
58 Subsystems will normally enable this
59 normally need to manually enable thi
60
61 If unsure, say N.
62
63 config BLK_DEV_INTEGRITY
64 bool "Block layer data integrity suppo
65 select CRC_T10DIF
66 select CRC64_ROCKSOFT
67 help
68 Some storage devices allow extra infor
69 stored/retrieved to help protect the d
70 data integrity option provides hooks w
71 filesystems to ensure better data inte
72
73 Say yes here if you have a storage dev
74 T10/SCSI Data Integrity Field or the T
75 Protection. If in doubt, say N.
76
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
98 bool "Zoned block device support"
99 help
100 Block layer zoned block device support
101 support for ZAC/ZBC/ZNS host-managed a
102 devices.
103
104 Say yes here if you have a ZAC, ZBC, o
105
106 config BLK_DEV_THROTTLING
107 bool "Block layer bio throttling suppo
108 depends on BLK_CGROUP
109 select BLK_CGROUP_RWSTAT
110 help
111 Block layer bio throttling support. It
112 the IO rate to a device. IO rate polic
113 one needs to mount and use blkio cgrou
114 cgroups and specifying per device IO r
115
116 See Documentation/admin-guide/cgroup-v
117
118 config BLK_WBT
119 bool "Enable support for block device
120 help
121 Enabling this option enables the block
122 background writeback from the VM, maki
123 less impact on foreground operations.
124 dynamically on an algorithm loosely ba
125 the realtime performance of the disk.
126
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
135 bool "Enable support for latency based
136 depends on BLK_CGROUP
137 help
138 Enabling this option enables the .late
139 The IO controller will attempt to main
140 the configured latency target, throttl
141 target than the victimized group.
142
143 Note, this is an experimental interfac
144
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
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
173 config BLK_DEBUG_FS
174 bool "Block layer debugging informatio
175 default y
176 depends on DEBUG_FS
177 help
178 Include block layer debugging informat
179 is mostly useful for kernel developers
180 at runtime.
181
182 Unless you are building a kernel for a
183 say Y here.
184
185 config BLK_SED_OPAL
186 bool "Logic for interfacing with Opal
187 depends on KEYS
188 select PSERIES_PLPKS if PPC_PSERIES
189 select PSERIES_PLPKS_SED if PPC_PSERIE
190 help
191 Builds Logic for interfacing with Opal
192 Enabling this option enables users to
193 Locking ranges for SED devices using t
194
195 config BLK_INLINE_ENCRYPTION
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
212 source "block/partitions/Kconfig"
213
214 config BLK_MQ_PCI
215 def_bool PCI
216
217 config BLK_MQ_VIRTIO
218 bool
219 depends on VIRTIO
220 default y
221
222 config BLK_PM
223 def_bool PM
224
225 # do not use in new code
226 config BLOCK_HOLDER_DEPRECATED
227 bool
228
229 config BLK_MQ_STACKING
230 bool
231
232 source "block/Kconfig.iosched"
233
234 endif # BLOCK
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.