2005-11-04 02:43:35 -05:00
|
|
|
#
|
|
|
|
# Block layer core configuration
|
|
|
|
#
|
2007-07-10 06:24:11 -04:00
|
|
|
menuconfig BLOCK
|
2006-09-30 15:14:05 -04:00
|
|
|
bool "Enable the block layer" if EMBEDDED
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 14:45:40 -04:00
|
|
|
default y
|
|
|
|
help
|
2008-04-21 03:51:04 -04:00
|
|
|
Provide block layer support for the kernel.
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 14:45:40 -04:00
|
|
|
|
2008-04-21 03:51:04 -04:00
|
|
|
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.
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30 14:45:40 -04:00
|
|
|
|
|
|
|
Say Y here unless you know you really don't want to mount disks and
|
|
|
|
suchlike.
|
|
|
|
|
|
|
|
if BLOCK
|
|
|
|
|
2009-06-19 02:08:50 -04:00
|
|
|
config LBDAF
|
|
|
|
bool "Support for large (2TB+) block devices and files"
|
2006-12-04 05:38:31 -05:00
|
|
|
depends on !64BIT
|
2009-04-21 03:27:03 -04:00
|
|
|
default y
|
2005-11-04 02:43:35 -05:00
|
|
|
help
|
2008-12-12 03:51:16 -05:00
|
|
|
Enable block devices or files of size 2TB and larger.
|
2008-04-21 03:51:04 -04:00
|
|
|
|
|
|
|
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.
|
2008-12-12 03:51:16 -05:00
|
|
|
|
|
|
|
This option also enables support for single files larger than
|
|
|
|
2TB.
|
2008-04-21 03:51:04 -04:00
|
|
|
|
2009-01-06 15:16:33 -05:00
|
|
|
The ext4 filesystem requires that this feature be enabled in
|
|
|
|
order to support filesystems that have the huge_file feature
|
2009-04-21 03:27:03 -04:00
|
|
|
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.
|
2009-01-06 15:16:33 -05:00
|
|
|
|
2009-04-21 03:27:03 -04:00
|
|
|
The GFS2 filesystem also requires this feature.
|
|
|
|
|
|
|
|
If unsure, say Y.
|
2005-11-04 02:43:35 -05:00
|
|
|
|
2007-07-09 06:38:05 -04:00
|
|
|
config BLK_DEV_BSG
|
2009-08-04 16:10:17 -04:00
|
|
|
bool "Block layer SG support v4"
|
|
|
|
default y
|
|
|
|
help
|
2008-04-21 03:51:04 -04:00
|
|
|
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).
|
|
|
|
|
2009-08-04 16:10:17 -04:00
|
|
|
This option is required by recent UDEV versions to properly
|
|
|
|
access device serial numbers, etc.
|
|
|
|
|
|
|
|
If unsure, say Y.
|
2007-07-09 06:38:05 -04:00
|
|
|
|
2008-06-30 14:04:41 -04:00
|
|
|
config BLK_DEV_INTEGRITY
|
|
|
|
bool "Block layer data integrity support"
|
|
|
|
---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.
|
|
|
|
|
2009-12-03 12:59:42 -05:00
|
|
|
config BLK_CGROUP
|
2010-03-16 03:57:15 -04:00
|
|
|
tristate "Block cgroup support"
|
2009-12-03 12:59:42 -05:00
|
|
|
depends on CGROUPS
|
2010-03-16 03:57:15 -04:00
|
|
|
depends on CFQ_GROUP_IOSCHED
|
2009-12-03 12:59:42 -05:00
|
|
|
default n
|
|
|
|
---help---
|
|
|
|
Generic block IO controller cgroup interface. This is the common
|
|
|
|
cgroup interface which should be used by various IO controlling
|
|
|
|
policies.
|
|
|
|
|
|
|
|
Currently, CFQ IO scheduler uses it to recognize task groups and
|
|
|
|
control disk bandwidth allocation (proportional time slice allocation)
|
|
|
|
to such task groups.
|
|
|
|
|
2009-12-03 12:59:48 -05:00
|
|
|
config DEBUG_BLK_CGROUP
|
|
|
|
bool
|
|
|
|
depends on BLK_CGROUP
|
|
|
|
default n
|
|
|
|
---help---
|
|
|
|
Enable some debugging help. Currently it stores the cgroup path
|
|
|
|
in the blk group which can be used by cfq for tracing various
|
|
|
|
group related activity.
|
|
|
|
|
2007-10-12 20:58:36 -04:00
|
|
|
endif # BLOCK
|
|
|
|
|
2007-10-12 06:50:41 -04:00
|
|
|
config BLOCK_COMPAT
|
|
|
|
bool
|
2007-10-12 20:58:36 -04:00
|
|
|
depends on BLOCK && COMPAT
|
2007-10-12 06:50:41 -04:00
|
|
|
default y
|
|
|
|
|
2005-11-04 02:43:35 -05:00
|
|
|
source block/Kconfig.iosched
|