2 # Block layer core configuration
5 bool "Enable the block layer" if EMBEDDED
8 Provide block layer support for the kernel.
10 Disable this option to remove the block layer support from the
11 kernel. This may be useful for embedded devices.
13 If this option is disabled:
15 - block device files will become unusable
16 - some filesystems (such as ext3) will become unavailable.
18 Also, SCSI character devices and USB storage will be disabled since
19 they make use of various block layer definitions and facilities.
21 Say Y here unless you know you really don't want to mount disks and
27 bool "Support for large block devices and files"
30 Enable block devices or files of size 2TB and larger.
32 This option is required to support the full capacity of large
33 (2TB+) block devices, including RAID, disk, Network Block Device,
34 Logical Volume Manager (LVM) and loopback.
36 This option also enables support for single files larger than
39 The ext4 filesystem requires that this feature be enabled in
40 order to support filesystems that have the huge_file feature
41 enabled. Otherwise, it will refuse to mount any filesystems
42 that use the huge_file feature, which is enabled by default
43 by mke2fs.ext4. The GFS2 filesystem also requires this feature.
48 bool "Block layer SG support v4"
51 Saying Y here will enable generic SG (SCSI generic) v4 support
54 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
55 can handle complicated SCSI commands: tagged variable length cdbs
56 with bidirectional data transfers and generic request/response
57 protocols (e.g. Task Management Functions and SMP in Serial
60 This option is required by recent UDEV versions to properly
61 access device serial numbers, etc.
65 config BLK_DEV_INTEGRITY
66 bool "Block layer data integrity support"
68 Some storage devices allow extra information to be
69 stored/retrieved to help protect the data. The block layer
70 data integrity option provides hooks which can be used by
71 filesystems to ensure better data integrity.
73 Say yes here if you have a storage device that provides the
74 T10/SCSI Data Integrity Field or the T13/ATA External Path
75 Protection. If in doubt, say N.
81 depends on BLOCK && COMPAT
84 source block/Kconfig.iosched