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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 | help |
8 | Provide block layer support for the kernel. |
9 | |
10 | Disable this option to remove the block layer support from the |
11 | kernel. This may be useful for embedded devices. |
12 | |
13 | If this option is disabled: |
14 | |
15 | - block device files will become unusable |
16 | - some filesystems (such as ext3) will become unavailable. |
17 | |
18 | Also, SCSI character devices and USB storage will be disabled since |
19 | they make use of various block layer definitions and facilities. |
20 | |
21 | Say Y here unless you know you really don't want to mount disks and |
22 | suchlike. |
23 | |
24 | if BLOCK |
25 | |
26 | config LBDAF |
27 | bool "Support for large (2TB+) block devices and files" |
28 | depends on !64BIT |
29 | default y |
30 | help |
31 | Enable block devices or files of size 2TB and larger. |
32 | |
33 | This option is required to support the full capacity of large |
34 | (2TB+) block devices, including RAID, disk, Network Block Device, |
35 | Logical Volume Manager (LVM) and loopback. |
36 | |
37 | This option also enables support for single files larger than |
38 | 2TB. |
39 | |
40 | The ext4 filesystem requires that this feature be enabled in |
41 | order to support filesystems that have the huge_file feature |
42 | enabled. Otherwise, it will refuse to mount in the read-write |
43 | mode any filesystems that use the huge_file feature, which is |
44 | enabled by default by mke2fs.ext4. |
45 | |
46 | The GFS2 filesystem also requires this feature. |
47 | |
48 | If unsure, say Y. |
49 | |
50 | config BLK_DEV_BSG |
51 | bool "Block layer SG support v4" |
52 | default y |
53 | help |
54 | Saying Y here will enable generic SG (SCSI generic) v4 support |
55 | for any block device. |
56 | |
57 | Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 |
58 | can handle complicated SCSI commands: tagged variable length cdbs |
59 | with bidirectional data transfers and generic request/response |
60 | protocols (e.g. Task Management Functions and SMP in Serial |
61 | Attached SCSI). |
62 | |
63 | This option is required by recent UDEV versions to properly |
64 | access device serial numbers, etc. |
65 | |
66 | If unsure, say Y. |
67 | |
68 | config BLK_DEV_BSGLIB |
69 | bool "Block layer SG support v4 helper lib" |
70 | default n |
71 | select BLK_DEV_BSG |
72 | help |
73 | Subsystems will normally enable this if needed. Users will not |
74 | normally need to manually enable this. |
75 | |
76 | If unsure, say N. |
77 | |
78 | config BLK_DEV_INTEGRITY |
79 | bool "Block layer data integrity support" |
80 | ---help--- |
81 | Some storage devices allow extra information to be |
82 | stored/retrieved to help protect the data. The block layer |
83 | data integrity option provides hooks which can be used by |
84 | filesystems to ensure better data integrity. |
85 | |
86 | Say yes here if you have a storage device that provides the |
87 | T10/SCSI Data Integrity Field or the T13/ATA External Path |
88 | Protection. If in doubt, say N. |
89 | |
90 | config BLK_DEV_THROTTLING |
91 | bool "Block layer bio throttling support" |
92 | depends on BLK_CGROUP=y |
93 | default n |
94 | ---help--- |
95 | Block layer bio throttling support. It can be used to limit |
96 | the IO rate to a device. IO rate policies are per cgroup and |
97 | one needs to mount and use blkio cgroup controller for creating |
98 | cgroups and specifying per device IO rate policies. |
99 | |
100 | See Documentation/cgroups/blkio-controller.txt for more information. |
101 | |
102 | config BLK_CMDLINE_PARSER |
103 | bool "Block device command line partition parser" |
104 | default n |
105 | ---help--- |
106 | Enabling this option allows you to specify the partition layout from |
107 | the kernel boot args. This is typically of use for embedded devices |
108 | which don't otherwise have any standardized method for listing the |
109 | partitions on a block device. |
110 | |
111 | See Documentation/block/cmdline-partition.txt for more information. |
112 | |
113 | menu "Partition Types" |
114 | |
115 | source "block/partitions/Kconfig" |
116 | |
117 | endmenu |
118 | |
119 | endif # BLOCK |
120 | |
121 | config BLOCK_COMPAT |
122 | bool |
123 | depends on BLOCK && COMPAT |
124 | default y |
125 | |
126 | source block/Kconfig.iosched |
127 |
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