| # |
| # Block layer core configuration |
| # |
| menuconfig BLOCK |
| bool "Enable the block layer" if EXPERT |
| default y |
| help |
| Provide block layer support for the kernel. |
| |
| Disable this option to remove the block layer support from the |
| kernel. This may be useful for embedded devices. |
| |
| If this option is disabled: |
| |
| - block device files will become unusable |
| - some filesystems (such as ext3) will become unavailable. |
| |
| Also, SCSI character devices and USB storage will be disabled since |
| they make use of various block layer definitions and facilities. |
| |
| Say Y here unless you know you really don't want to mount disks and |
| suchlike. |
| |
| if BLOCK |
| |
| config LBDAF |
| bool "Support for large (2TB+) block devices and files" |
| depends on !64BIT |
| default y |
| help |
| Enable block devices or files of size 2TB and larger. |
| |
| This option is required to support the full capacity of large |
| (2TB+) block devices, including RAID, disk, Network Block Device, |
| Logical Volume Manager (LVM) and loopback. |
| |
| This option also enables support for single files larger than |
| 2TB. |
| |
| The ext4 filesystem requires that this feature be enabled in |
| order to support filesystems that have the huge_file feature |
| enabled. Otherwise, it will refuse to mount in the read-write |
| mode any filesystems that use the huge_file feature, which is |
| enabled by default by mke2fs.ext4. |
| |
| The GFS2 filesystem also requires this feature. |
| |
| If unsure, say Y. |
| |
| config BLK_DEV_BSG |
| bool "Block layer SG support v4" |
| default y |
| help |
| Saying Y here will enable generic SG (SCSI generic) v4 support |
| for any block device. |
| |
| Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 |
| can handle complicated SCSI commands: tagged variable length cdbs |
| with bidirectional data transfers and generic request/response |
| protocols (e.g. Task Management Functions and SMP in Serial |
| Attached SCSI). |
| |
| This option is required by recent UDEV versions to properly |
| access device serial numbers, etc. |
| |
| If unsure, say Y. |
| |
| config BLK_DEV_BSGLIB |
| bool "Block layer SG support v4 helper lib" |
| default n |
| select BLK_DEV_BSG |
| help |
| Subsystems will normally enable this if needed. Users will not |
| normally need to manually enable this. |
| |
| If unsure, say N. |
| |
| config BLK_DEV_INTEGRITY |
| bool "Block layer data integrity support" |
| select CRC_T10DIF if BLK_DEV_INTEGRITY |
| ---help--- |
| Some storage devices allow extra information to be |
| stored/retrieved to help protect the data. The block layer |
| data integrity option provides hooks which can be used by |
| filesystems to ensure better data integrity. |
| |
| Say yes here if you have a storage device that provides the |
| T10/SCSI Data Integrity Field or the T13/ATA External Path |
| Protection. If in doubt, say N. |
| |
| config BLK_DEV_DAX |
| bool "Block device DAX support" |
| depends on FS_DAX |
| depends on BROKEN |
| help |
| When DAX support is available (CONFIG_FS_DAX) raw block |
| devices can also support direct userspace access to the |
| storage capacity via MMAP(2) similar to a file on a |
| DAX-enabled filesystem. However, the DAX I/O-path disables |
| some standard I/O-statistics, and the MMAP(2) path has some |
| operational differences due to bypassing the page |
| cache. If in doubt, say N. |
| |
| config BLK_DEV_THROTTLING |
| bool "Block layer bio throttling support" |
| depends on BLK_CGROUP=y |
| default n |
| ---help--- |
| Block layer bio throttling support. It can be used to limit |
| the IO rate to a device. IO rate policies are per cgroup and |
| one needs to mount and use blkio cgroup controller for creating |
| cgroups and specifying per device IO rate policies. |
| |
| See Documentation/cgroups/blkio-controller.txt for more information. |
| |
| config BLK_CMDLINE_PARSER |
| bool "Block device command line partition parser" |
| default n |
| ---help--- |
| Enabling this option allows you to specify the partition layout from |
| the kernel boot args. This is typically of use for embedded devices |
| which don't otherwise have any standardized method for listing the |
| partitions on a block device. |
| |
| See Documentation/block/cmdline-partition.txt for more information. |
| |
| menu "Partition Types" |
| |
| source "block/partitions/Kconfig" |
| |
| endmenu |
| |
| endif # BLOCK |
| |
| config BLOCK_COMPAT |
| bool |
| depends on BLOCK && COMPAT |
| default y |
| |
| source block/Kconfig.iosched |
