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TOMOYO Linux Cross Reference
Linux/block/Kconfig

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  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 SBITMAP
  9        select SRCU
 10        help
 11          Provide block layer support for the kernel.
 12 
 13          Disable this option to remove the block layer support from the
 14          kernel. This may be useful for embedded devices.
 15 
 16          If this option is disabled:
 17 
 18            - block device files will become unusable
 19            - some filesystems (such as ext3) will become unavailable.
 20 
 21          Also, SCSI character devices and USB storage will be disabled since
 22          they make use of various block layer definitions and facilities.
 23 
 24          Say Y here unless you know you really don't want to mount disks and
 25          suchlike.
 26 
 27 if BLOCK
 28 
 29 config BLK_RQ_ALLOC_TIME
 30         bool
 31 
 32 config BLK_CGROUP_RWSTAT
 33         bool
 34 
 35 config BLK_DEV_BSG_COMMON
 36         tristate
 37 
 38 config BLK_ICQ
 39         bool
 40 
 41 config BLK_DEV_BSGLIB
 42         bool "Block layer SG support v4 helper lib"
 43         select BLK_DEV_BSG_COMMON
 44         help
 45           Subsystems will normally enable this if needed. Users will not
 46           normally need to manually enable this.
 47 
 48           If unsure, say N.
 49 
 50 config BLK_DEV_INTEGRITY
 51         bool "Block layer data integrity support"
 52         help
 53         Some storage devices allow extra information to be
 54         stored/retrieved to help protect the data.  The block layer
 55         data integrity option provides hooks which can be used by
 56         filesystems to ensure better data integrity.
 57 
 58         Say yes here if you have a storage device that provides the
 59         T10/SCSI Data Integrity Field or the T13/ATA External Path
 60         Protection.  If in doubt, say N.
 61 
 62 config BLK_DEV_INTEGRITY_T10
 63         tristate
 64         depends on BLK_DEV_INTEGRITY
 65         select CRC_T10DIF
 66 
 67 config BLK_DEV_ZONED
 68         bool "Zoned block device support"
 69         select MQ_IOSCHED_DEADLINE
 70         help
 71         Block layer zoned block device support. This option enables
 72         support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
 73         devices.
 74 
 75         Say yes here if you have a ZAC, ZBC, or ZNS storage device.
 76 
 77 config BLK_DEV_THROTTLING
 78         bool "Block layer bio throttling support"
 79         depends on BLK_CGROUP
 80         select BLK_CGROUP_RWSTAT
 81         help
 82         Block layer bio throttling support. It can be used to limit
 83         the IO rate to a device. IO rate policies are per cgroup and
 84         one needs to mount and use blkio cgroup controller for creating
 85         cgroups and specifying per device IO rate policies.
 86 
 87         See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
 88 
 89 config BLK_DEV_THROTTLING_LOW
 90         bool "Block throttling .low limit interface support (EXPERIMENTAL)"
 91         depends on BLK_DEV_THROTTLING
 92         help
 93         Add .low limit interface for block throttling. The low limit is a best
 94         effort limit to prioritize cgroups. Depending on the setting, the limit
 95         can be used to protect cgroups in terms of bandwidth/iops and better
 96         utilize disk resource.
 97 
 98         Note, this is an experimental interface and could be changed someday.
 99 
100 config BLK_WBT
101         bool "Enable support for block device writeback throttling"
102         help
103         Enabling this option enables the block layer to throttle buffered
104         background writeback from the VM, making it more smooth and having
105         less impact on foreground operations. The throttling is done
106         dynamically on an algorithm loosely based on CoDel, factoring in
107         the realtime performance of the disk.
108 
109 config BLK_WBT_MQ
110         bool "Enable writeback throttling by default"
111         default y
112         depends on BLK_WBT
113         help
114         Enable writeback throttling by default for request-based block devices.
115 
116 config BLK_CGROUP_IOLATENCY
117         bool "Enable support for latency based cgroup IO protection"
118         depends on BLK_CGROUP
119         help
120         Enabling this option enables the .latency interface for IO throttling.
121         The IO controller will attempt to maintain average IO latencies below
122         the configured latency target, throttling anybody with a higher latency
123         target than the victimized group.
124 
125         Note, this is an experimental interface and could be changed someday.
126 
127 config BLK_CGROUP_FC_APPID
128         bool "Enable support to track FC I/O Traffic across cgroup applications"
129         depends on BLK_CGROUP && NVME_FC
130         help
131           Enabling this option enables the support to track FC I/O traffic across
132           cgroup applications. It enables the Fabric and the storage targets to
133           identify, monitor, and handle FC traffic based on VM tags by inserting
134           application specific identification into the FC frame.
135 
136 config BLK_CGROUP_IOCOST
137         bool "Enable support for cost model based cgroup IO controller"
138         depends on BLK_CGROUP
139         select BLK_RQ_IO_DATA_LEN
140         select BLK_RQ_ALLOC_TIME
141         help
142         Enabling this option enables the .weight interface for cost
143         model based proportional IO control.  The IO controller
144         distributes IO capacity between different groups based on
145         their share of the overall weight distribution.
146 
147 config BLK_CGROUP_IOPRIO
148         bool "Cgroup I/O controller for assigning an I/O priority class"
149         depends on BLK_CGROUP
150         help
151         Enable the .prio interface for assigning an I/O priority class to
152         requests. The I/O priority class affects the order in which an I/O
153         scheduler and block devices process requests. Only some I/O schedulers
154         and some block devices support I/O priorities.
155 
156 config BLK_DEBUG_FS
157         bool "Block layer debugging information in debugfs"
158         default y
159         depends on DEBUG_FS
160         help
161         Include block layer debugging information in debugfs. This information
162         is mostly useful for kernel developers, but it doesn't incur any cost
163         at runtime.
164 
165         Unless you are building a kernel for a tiny system, you should
166         say Y here.
167 
168 config BLK_DEBUG_FS_ZONED
169        bool
170        default BLK_DEBUG_FS && BLK_DEV_ZONED
171 
172 config BLK_SED_OPAL
173         bool "Logic for interfacing with Opal enabled SEDs"
174         help
175         Builds Logic for interfacing with Opal enabled controllers.
176         Enabling this option enables users to setup/unlock/lock
177         Locking ranges for SED devices using the Opal protocol.
178 
179 config BLK_INLINE_ENCRYPTION
180         bool "Enable inline encryption support in block layer"
181         help
182           Build the blk-crypto subsystem. Enabling this lets the
183           block layer handle encryption, so users can take
184           advantage of inline encryption hardware if present.
185 
186 config BLK_INLINE_ENCRYPTION_FALLBACK
187         bool "Enable crypto API fallback for blk-crypto"
188         depends on BLK_INLINE_ENCRYPTION
189         select CRYPTO
190         select CRYPTO_SKCIPHER
191         help
192           Enabling this lets the block layer handle inline encryption
193           by falling back to the kernel crypto API when inline
194           encryption hardware is not present.
195 
196 source "block/partitions/Kconfig"
197 
198 config BLOCK_COMPAT
199         def_bool COMPAT
200 
201 config BLK_MQ_PCI
202         def_bool PCI
203 
204 config BLK_MQ_VIRTIO
205         bool
206         depends on VIRTIO
207         default y
208 
209 config BLK_MQ_RDMA
210         bool
211         depends on INFINIBAND
212         default y
213 
214 config BLK_PM
215         def_bool PM
216 
217 # do not use in new code
218 config BLOCK_HOLDER_DEPRECATED
219         bool
220 
221 source "block/Kconfig.iosched"
222 
223 endif # BLOCK

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