2005-04-16 15:20:36 -07:00
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[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 20:45:40 +02:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:53 -08:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:14:16 -07:00
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2007-04-20 22:16:58 +02:00
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2005-04-16 15:20:36 -07:00
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2007-03-26 23:03:19 +02:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:54 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-07 18:19:32 +01:00
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2005-04-16 15:20:36 -07:00
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2007-02-07 18:19:37 +01:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:54 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-17 19:52:10 +01:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:54 -08:00
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2005-04-16 15:20:36 -07:00
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2005-11-09 23:58:16 +01:00
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2005-04-16 15:20:36 -07:00
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2006-10-03 01:14:12 -07:00
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2005-04-16 15:20:36 -07:00
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2007-02-07 18:19:09 +01:00
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2005-06-27 15:24:30 -07:00
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2005-04-16 15:20:36 -07:00
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2005-11-18 16:18:40 -05:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:54 -08:00
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2005-04-16 15:20:36 -07:00
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2005-06-21 17:16:01 -07:00
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2006-07-30 03:03:46 -07:00
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2005-04-16 15:20:36 -07:00
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2006-12-06 20:39:55 -08:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:54 -08:00
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2005-04-16 15:20:36 -07:00
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2007-02-07 18:18:45 +01:00
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2007-03-17 21:57:25 +01:00
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2005-04-16 15:20:36 -07:00
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2005-08-18 22:13:44 +02:00
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2005-04-16 15:20:36 -07:00
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2005-11-17 16:23:50 +00:00
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2005-09-15 08:03:12 +00:00
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2006-12-12 20:04:19 +01:00
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2005-09-15 08:03:12 +00:00
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2005-04-16 15:20:36 -07:00
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2005-12-15 02:12:53 +01:00
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2005-04-16 15:20:36 -07:00
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2007-03-03 17:48:55 +01:00
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2005-04-16 15:20:36 -07:00
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2007-03-03 17:48:55 +01:00
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2005-04-16 15:20:36 -07:00
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2007-03-03 17:48:55 +01:00
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2005-04-16 15:20:36 -07:00
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2007-03-03 17:48:55 +01:00
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2005-04-16 15:20:36 -07:00
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2007-03-03 17:48:55 +01:00
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2005-04-16 15:20:36 -07:00
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2005-09-15 08:03:12 +00:00
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2005-04-16 15:20:36 -07:00
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2006-02-03 03:04:54 -08:00
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2005-04-16 15:20:36 -07:00
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[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 20:45:40 +02:00
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