| Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1 | # |
| 2 | # Block layer core configuration |
| 3 | # |
| Jan Engelhardt | 16ed002 | 2007-07-10 12:24:11 +0200 | [diff] [blame] | 4 | menuconfig BLOCK |
| Jens Axboe | 51d7513 | 2006-09-30 21:14:05 +0200 | [diff] [blame] | 5 | bool "Enable the block layer" if EMBEDDED |
| David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 6 | default y |
| 7 | help |
| Nick Andrew | ee86418 | 2008-04-21 09:51:04 +0200 | [diff] [blame] | 8 | Provide block layer support for the kernel. |
| David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 9 | |
| Nick Andrew | ee86418 | 2008-04-21 09:51:04 +0200 | [diff] [blame] | 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. |
| David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 20 | |
| 21 | Say Y here unless you know you really don't want to mount disks and |
| 22 | suchlike. |
| 23 | |
| 24 | if BLOCK |
| 25 | |
| Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 26 | config LBD |
| Jens Axboe | b3a6ffe | 2008-12-12 09:51:16 +0100 | [diff] [blame] | 27 | bool "Support for large block devices and files" |
| Matthew Wilcox | e624386 | 2006-12-04 03:38:31 -0700 | [diff] [blame] | 28 | depends on !64BIT |
| Bartlomiej Zolnierkiewicz | db29a6b | 2009-04-21 09:27:03 +0200 | [diff] [blame] | 29 | default y |
| Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 30 | help |
| Jens Axboe | b3a6ffe | 2008-12-12 09:51:16 +0100 | [diff] [blame] | 31 | Enable block devices or files of size 2TB and larger. |
| Nick Andrew | ee86418 | 2008-04-21 09:51:04 +0200 | [diff] [blame] | 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. |
| Jens Axboe | b3a6ffe | 2008-12-12 09:51:16 +0100 | [diff] [blame] | 36 | |
| 37 | This option also enables support for single files larger than |
| 38 | 2TB. |
| Nick Andrew | ee86418 | 2008-04-21 09:51:04 +0200 | [diff] [blame] | 39 | |
| Theodore Ts'o | 4d783b0 | 2009-01-06 15:16:33 -0500 | [diff] [blame] | 40 | The ext4 filesystem requires that this feature be enabled in |
| 41 | order to support filesystems that have the huge_file feature |
| Bartlomiej Zolnierkiewicz | db29a6b | 2009-04-21 09:27:03 +0200 | [diff] [blame] | 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. |
| Theodore Ts'o | 4d783b0 | 2009-01-06 15:16:33 -0500 | [diff] [blame] | 45 | |
| Bartlomiej Zolnierkiewicz | db29a6b | 2009-04-21 09:27:03 +0200 | [diff] [blame] | 46 | The GFS2 filesystem also requires this feature. |
| 47 | |
| 48 | If unsure, say Y. |
| Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 49 | |
| Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 50 | config BLK_DEV_BSG |
| FUJITA Tomonori | 319a7b7 | 2007-07-17 12:22:09 +0200 | [diff] [blame] | 51 | bool "Block layer SG support v4 (EXPERIMENTAL)" |
| James Bottomley | 80ed71c | 2007-07-19 10:15:10 -0500 | [diff] [blame] | 52 | depends on EXPERIMENTAL |
| Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 53 | ---help--- |
| Nick Andrew | ee86418 | 2008-04-21 09:51:04 +0200 | [diff] [blame] | 54 | Saying Y here will enable generic SG (SCSI generic) v4 support |
| 55 | for any block device. |
| FUJITA Tomonori | 319a7b7 | 2007-07-17 12:22:09 +0200 | [diff] [blame] | 56 | |
| Nick Andrew | ee86418 | 2008-04-21 09:51:04 +0200 | [diff] [blame] | 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 | If unsure, say N. |
| Jens Axboe | 3d6392c | 2007-07-09 12:38:05 +0200 | [diff] [blame] | 64 | |
| Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 65 | config BLK_DEV_INTEGRITY |
| 66 | bool "Block layer data integrity support" |
| 67 | ---help--- |
| 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. |
| 72 | |
| 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. |
| 76 | |
| Linus Torvalds | 2b9e0aa | 2007-10-12 17:58:36 -0700 | [diff] [blame] | 77 | endif # BLOCK |
| 78 | |
| Jens Axboe | 99874d5 | 2007-10-12 12:50:41 +0200 | [diff] [blame] | 79 | config BLOCK_COMPAT |
| 80 | bool |
| Linus Torvalds | 2b9e0aa | 2007-10-12 17:58:36 -0700 | [diff] [blame] | 81 | depends on BLOCK && COMPAT |
| Jens Axboe | 99874d5 | 2007-10-12 12:50:41 +0200 | [diff] [blame] | 82 | default y |
| 83 | |
| Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 84 | source block/Kconfig.iosched |