| | 1 | # |
| | 2 | # Block layer core configuration |
| | 3 | # |
| | 4 | menuconfig 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 | |
| | 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_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 | |
| | 80 | config BLK_CGROUP |
| | 81 | bool |
| | 82 | depends on CGROUPS |
| | 83 | default n |
| | 84 | ---help--- |
| | 85 | Generic block IO controller cgroup interface. This is the common |
| | 86 | cgroup interface which should be used by various IO controlling |
| | 87 | policies. |
| | 88 | |
| | 89 | Currently, CFQ IO scheduler uses it to recognize task groups and |
| | 90 | control disk bandwidth allocation (proportional time slice allocation) |
| | 91 | to such task groups. |
| | 92 | |
| | 93 | config DEBUG_BLK_CGROUP |
| | 94 | bool |
| | 95 | depends on BLK_CGROUP |
| | 96 | default n |
| | 97 | ---help--- |
| | 98 | Enable some debugging help. Currently it stores the cgroup path |
| | 99 | in the blk group which can be used by cfq for tracing various |
| | 100 | group related activity. |
| | 101 | |
| | 102 | endif # BLOCK |
| | 103 | |
| | 104 | config BLOCK_COMPAT |
| | 105 | bool |
| | 106 | depends on BLOCK && COMPAT |
| | 107 | default y |
| | 108 | |
| | 109 | source block/Kconfig.iosched |
projects / linux-2.6-block.git / blame_incremental