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Commit | Line | Data |
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1 | # | |
2 | # Block layer core configuration | |
3 | # | |
4 | menuconfig BLOCK | |
5 | bool "Enable the block layer" if EXPERT | |
6 | default y | |
7 | select SBITMAP | |
8 | select SRCU | |
9 | help | |
10 | Provide block layer support for the kernel. | |
11 | ||
12 | Disable this option to remove the block layer support from the | |
13 | kernel. This may be useful for embedded devices. | |
14 | ||
15 | If this option is disabled: | |
16 | ||
17 | - block device files will become unusable | |
18 | - some filesystems (such as ext3) will become unavailable. | |
19 | ||
20 | Also, SCSI character devices and USB storage will be disabled since | |
21 | they make use of various block layer definitions and facilities. | |
22 | ||
23 | Say Y here unless you know you really don't want to mount disks and | |
24 | suchlike. | |
25 | ||
26 | if BLOCK | |
27 | ||
28 | config LBDAF | |
29 | bool "Support for large (2TB+) block devices and files" | |
30 | depends on !64BIT | |
31 | default y | |
32 | help | |
33 | Enable block devices or files of size 2TB and larger. | |
34 | ||
35 | This option is required to support the full capacity of large | |
36 | (2TB+) block devices, including RAID, disk, Network Block Device, | |
37 | Logical Volume Manager (LVM) and loopback. | |
38 | ||
39 | This option also enables support for single files larger than | |
40 | 2TB. | |
41 | ||
42 | The ext4 filesystem requires that this feature be enabled in | |
43 | order to support filesystems that have the huge_file feature | |
44 | enabled. Otherwise, it will refuse to mount in the read-write | |
45 | mode any filesystems that use the huge_file feature, which is | |
46 | enabled by default by mke2fs.ext4. | |
47 | ||
48 | The GFS2 filesystem also requires this feature. | |
49 | ||
50 | If unsure, say Y. | |
51 | ||
52 | config BLK_DEV_BSG | |
53 | bool "Block layer SG support v4" | |
54 | default y | |
55 | help | |
56 | Saying Y here will enable generic SG (SCSI generic) v4 support | |
57 | for any block device. | |
58 | ||
59 | Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 | |
60 | can handle complicated SCSI commands: tagged variable length cdbs | |
61 | with bidirectional data transfers and generic request/response | |
62 | protocols (e.g. Task Management Functions and SMP in Serial | |
63 | Attached SCSI). | |
64 | ||
65 | This option is required by recent UDEV versions to properly | |
66 | access device serial numbers, etc. | |
67 | ||
68 | If unsure, say Y. | |
69 | ||
70 | config BLK_DEV_BSGLIB | |
71 | bool "Block layer SG support v4 helper lib" | |
72 | default n | |
73 | select BLK_DEV_BSG | |
74 | help | |
75 | Subsystems will normally enable this if needed. Users will not | |
76 | normally need to manually enable this. | |
77 | ||
78 | If unsure, say N. | |
79 | ||
80 | config BLK_DEV_INTEGRITY | |
81 | bool "Block layer data integrity support" | |
82 | select CRC_T10DIF if BLK_DEV_INTEGRITY | |
83 | ---help--- | |
84 | Some storage devices allow extra information to be | |
85 | stored/retrieved to help protect the data. The block layer | |
86 | data integrity option provides hooks which can be used by | |
87 | filesystems to ensure better data integrity. | |
88 | ||
89 | Say yes here if you have a storage device that provides the | |
90 | T10/SCSI Data Integrity Field or the T13/ATA External Path | |
91 | Protection. If in doubt, say N. | |
92 | ||
93 | config BLK_DEV_ZONED | |
94 | bool "Zoned block device support" | |
95 | ---help--- | |
96 | Block layer zoned block device support. This option enables | |
97 | support for ZAC/ZBC host-managed and host-aware zoned block devices. | |
98 | ||
99 | Say yes here if you have a ZAC or ZBC storage device. | |
100 | ||
101 | config BLK_DEV_THROTTLING | |
102 | bool "Block layer bio throttling support" | |
103 | depends on BLK_CGROUP=y | |
104 | default n | |
105 | ---help--- | |
106 | Block layer bio throttling support. It can be used to limit | |
107 | the IO rate to a device. IO rate policies are per cgroup and | |
108 | one needs to mount and use blkio cgroup controller for creating | |
109 | cgroups and specifying per device IO rate policies. | |
110 | ||
111 | See Documentation/cgroups/blkio-controller.txt for more information. | |
112 | ||
113 | config BLK_CMDLINE_PARSER | |
114 | bool "Block device command line partition parser" | |
115 | default n | |
116 | ---help--- | |
117 | Enabling this option allows you to specify the partition layout from | |
118 | the kernel boot args. This is typically of use for embedded devices | |
119 | which don't otherwise have any standardized method for listing the | |
120 | partitions on a block device. | |
121 | ||
122 | See Documentation/block/cmdline-partition.txt for more information. | |
123 | ||
124 | config BLK_WBT | |
125 | bool "Enable support for block device writeback throttling" | |
126 | default n | |
127 | ---help--- | |
128 | Enabling this option enables the block layer to throttle buffered | |
129 | background writeback from the VM, making it more smooth and having | |
130 | less impact on foreground operations. The throttling is done | |
131 | dynamically on an algorithm loosely based on CoDel, factoring in | |
132 | the realtime performance of the disk. | |
133 | ||
134 | config BLK_WBT_SQ | |
135 | bool "Single queue writeback throttling" | |
136 | default n | |
137 | depends on BLK_WBT | |
138 | ---help--- | |
139 | Enable writeback throttling by default on legacy single queue devices | |
140 | ||
141 | config BLK_WBT_MQ | |
142 | bool "Multiqueue writeback throttling" | |
143 | default y | |
144 | depends on BLK_WBT | |
145 | ---help--- | |
146 | Enable writeback throttling by default on multiqueue devices. | |
147 | Multiqueue currently doesn't have support for IO scheduling, | |
148 | enabling this option is recommended. | |
149 | ||
150 | menu "Partition Types" | |
151 | ||
152 | source "block/partitions/Kconfig" | |
153 | ||
154 | endmenu | |
155 | ||
156 | endif # BLOCK | |
157 | ||
158 | config BLOCK_COMPAT | |
159 | bool | |
160 | depends on BLOCK && COMPAT | |
161 | default y | |
162 | ||
163 | config BLK_MQ_PCI | |
164 | bool | |
165 | depends on BLOCK && PCI | |
166 | default y | |
167 | ||
168 | source block/Kconfig.iosched |