Root/block/Kconfig

1#
2# Block layer core configuration
3#
4menuconfig BLOCK
5       bool "Enable the block layer" if EMBEDDED
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
24if BLOCK
25
26config 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
50config 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
68config BLK_DEV_INTEGRITY
69    bool "Block layer data integrity support"
70    ---help---
71    Some storage devices allow extra information to be
72    stored/retrieved to help protect the data. The block layer
73    data integrity option provides hooks which can be used by
74    filesystems to ensure better data integrity.
75
76    Say yes here if you have a storage device that provides the
77    T10/SCSI Data Integrity Field or the T13/ATA External Path
78    Protection. If in doubt, say N.
79
80endif # BLOCK
81
82config BLOCK_COMPAT
83    bool
84    depends on BLOCK && COMPAT
85    default y
86
87source block/Kconfig.iosched
88

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