bab55417b1
Read block device partition table from command line. The partition used for fixed block device (eMMC) embedded device. It is no MBR, save storage space. Bootloader can be easily accessed by absolute address of data on the block device. Users can easily change the partition. This code reference MTD partition, source "drivers/mtd/cmdlinepart.c" About the partition verbose reference "Documentation/block/cmdline-partition.txt" [akpm@linux-foundation.org: fix printk text] [yongjun_wei@trendmicro.com.cn: fix error return code in parse_parts()] Signed-off-by: Cai Zhiyong <caizhiyong@huawei.com> Cc: Karel Zak <kzak@redhat.com> Cc: "Wanglin (Albert)" <albert.wanglin@huawei.com> Cc: Marius Groeger <mag@sysgo.de> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Artem Bityutskiy <dedekind@infradead.org> Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
122 lines
3.4 KiB
Plaintext
122 lines
3.4 KiB
Plaintext
#
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# Block layer core configuration
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#
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menuconfig BLOCK
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bool "Enable the block layer" if EXPERT
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default y
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help
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Provide block layer support for the kernel.
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Disable this option to remove the block layer support from the
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kernel. This may be useful for embedded devices.
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If this option is disabled:
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- block device files will become unusable
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- some filesystems (such as ext3) will become unavailable.
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Also, SCSI character devices and USB storage will be disabled since
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they make use of various block layer definitions and facilities.
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Say Y here unless you know you really don't want to mount disks and
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suchlike.
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if BLOCK
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config LBDAF
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bool "Support for large (2TB+) block devices and files"
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depends on !64BIT
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default y
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help
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Enable block devices or files of size 2TB and larger.
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This option is required to support the full capacity of large
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(2TB+) block devices, including RAID, disk, Network Block Device,
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Logical Volume Manager (LVM) and loopback.
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This option also enables support for single files larger than
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2TB.
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The ext4 filesystem requires that this feature be enabled in
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order to support filesystems that have the huge_file feature
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enabled. Otherwise, it will refuse to mount in the read-write
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mode any filesystems that use the huge_file feature, which is
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enabled by default by mke2fs.ext4.
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The GFS2 filesystem also requires this feature.
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If unsure, say Y.
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config BLK_DEV_BSG
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bool "Block layer SG support v4"
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default y
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help
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Saying Y here will enable generic SG (SCSI generic) v4 support
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for any block device.
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Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
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can handle complicated SCSI commands: tagged variable length cdbs
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with bidirectional data transfers and generic request/response
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protocols (e.g. Task Management Functions and SMP in Serial
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Attached SCSI).
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This option is required by recent UDEV versions to properly
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access device serial numbers, etc.
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If unsure, say Y.
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config BLK_DEV_BSGLIB
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bool "Block layer SG support v4 helper lib"
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default n
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select BLK_DEV_BSG
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help
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Subsystems will normally enable this if needed. Users will not
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normally need to manually enable this.
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If unsure, say N.
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config BLK_DEV_INTEGRITY
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bool "Block layer data integrity support"
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---help---
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Some storage devices allow extra information to be
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stored/retrieved to help protect the data. The block layer
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data integrity option provides hooks which can be used by
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filesystems to ensure better data integrity.
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Say yes here if you have a storage device that provides the
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T10/SCSI Data Integrity Field or the T13/ATA External Path
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Protection. If in doubt, say N.
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config BLK_DEV_THROTTLING
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bool "Block layer bio throttling support"
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depends on BLK_CGROUP=y
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default n
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---help---
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Block layer bio throttling support. It can be used to limit
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the IO rate to a device. IO rate policies are per cgroup and
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one needs to mount and use blkio cgroup controller for creating
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cgroups and specifying per device IO rate policies.
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See Documentation/cgroups/blkio-controller.txt for more information.
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config CMDLINE_PARSER
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bool "Block device command line partition parser"
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default n
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---help---
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Parsing command line, get the partitions information.
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menu "Partition Types"
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source "block/partitions/Kconfig"
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endmenu
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endif # BLOCK
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config BLOCK_COMPAT
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bool
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depends on BLOCK && COMPAT
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default y
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source block/Kconfig.iosched
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