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9361401eb7
linux/drivers/block
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David Howells 9361401eb7 [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 20:52:31 +02:00
..
aoe [PATCH] aoe: cleanup i_rdev usage 2006-07-10 13:24:25 -07:00
paride [PATCH] Remove ->rq_status from struct request 2006-09-30 20:29:23 +02:00
acsi_slm.c [PATCH] devfs: Remove the devfs_fs_kernel.h file from the tree 2006-06-26 12:25:08 -07:00
acsi.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
amiflop.c [PATCH] m68k: introduce irq controller 2006-06-25 10:00:57 -07:00
ataflop.c [PATCH] Remove MODULE_PARM 2006-03-25 08:22:52 -08:00
cciss_cmd.h [PATCH] cciss: direct lookup for command completions 2005-09-13 08:22:30 -07:00
cciss_scsi.c [SCSI] Improve inquiry printing 2006-08-06 15:59:26 -05:00
cciss_scsi.h
cciss.c [PATCH] Kill various deprecated/unused block layer defines/functions 2006-09-30 20:29:38 +02:00
cciss.h [PATCH] CCISS: request all PCI resources 2006-06-25 10:01:21 -07:00
cpqarray.c [PATCH] Kill various deprecated/unused block layer defines/functions 2006-09-30 20:29:38 +02:00
cpqarray.h
cryptoloop.c [BLOCK] cryptoloop: Use block ciphers where applicable 2006-09-21 11:45:53 +10:00
DAC960.c [PATCH] Remove ->waiting member from struct request 2006-09-30 20:29:12 +02:00
DAC960.h [PATCH] DAC960: add support for Mylex AcceleRAID 4/5/600 2005-05-05 16:36:43 -07:00
floppy.c [PATCH] Split struct request ->flags into two parts 2006-09-30 20:23:37 +02:00
ida_cmd.h
ida_ioctl.h
Kconfig [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
loop.c [PATCH] BLOCK: Move the loop device ioctl compat stuff to the loop driver [try #6] 2006-09-30 20:52:27 +02:00
Makefile [PATCH] block: floppy98 removal, really. 2006-03-24 07:33:26 -08:00
nbd.c [PATCH] Split struct request ->flags into two parts 2006-09-30 20:23:37 +02:00
pktcdvd.c [PATCH] Remove ->waiting member from struct request 2006-09-30 20:29:12 +02:00
ps2esdi.c [PATCH] irq-flags: drivers/block Use the new IRQF_ constants 2006-07-02 13:58:49 -07:00
rd.c [PATCH] ramdisk blocksize Kconfig entry 2006-07-14 21:53:53 -07:00
smart1,2.h
swim3.c [PATCH] Remove ->rq_status from struct request 2006-09-30 20:29:23 +02:00
swim_iop.c [PATCH] Remove ->rq_status from struct request 2006-09-30 20:29:23 +02:00
sx8.c [PATCH] irq-flags: drivers/block Use the new IRQF_ constants 2006-07-02 13:58:49 -07:00
ub.c USB: UB: Let cdrecord to see a device with media absent 2006-09-27 11:58:57 -07:00
umem.c [PATCH] irq-flags: drivers/block Use the new IRQF_ constants 2006-07-02 13:58:49 -07:00
viodasd.c [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
xd.c [PATCH] Split struct request ->flags into two parts 2006-09-30 20:23:37 +02:00
xd.h
z2ram.c [PATCH] devfs: Remove the gendisk devfs_name field as it's no longer needed 2006-06-26 12:25:08 -07:00