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