android_kernel_xiaomi_sm8350/drivers/mtd
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
..
chips [MTD] Unlock NOR flash automatically where necessary 2006-09-22 10:07:08 +01:00
devices [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
maps [MTD] Remove iq80310 map driver 2006-09-22 10:31:01 +01:00
nand [MTD NAND] Fix in typo ndfc.c causing wrong ECC layout 2006-09-22 10:30:25 +01:00
onenand [MTD] Rework the out of band handling completely 2006-05-29 15:06:51 +02:00
afs.c [MTD] core: Clean up trailing white spaces 2005-11-07 13:37:38 +01:00
cmdlinepart.c [PATCH] mtd cmdlinepart: allow zero offset value 2006-03-31 12:18:48 -08:00
ftl.c [MTD] Make functions static, include header files with prototypes 2005-11-29 19:54:58 +01:00
inftlcore.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
inftlmount.c [MTD] Rework the out of band handling completely 2006-05-29 15:06:51 +02:00
Kconfig [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
Makefile [MTD] Add SSFDC (SmartMedia) read-only translation layer 2006-09-22 11:01:37 +01:00
mtd_blkdevs.c [PATCH] Split struct request ->flags into two parts 2006-09-30 20:23:37 +02:00
mtdblock_ro.c Make mtdblock_ro unconditionally readonly 2006-04-17 15:48:16 +01:00
mtdblock.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
mtdchar.c [MTD] Use SEEK_{SET,CUR,END} instead of hardcoded values in mtdchar lseek() 2006-09-17 17:04:23 +01:00
mtdconcat.c [MTD] NAND Expose the new raw mode function and status info to userspace 2006-05-30 00:37:34 +02:00
mtdcore.c [MTD] Unlock NOR flash automatically where necessary 2006-09-22 10:07:08 +01:00
mtdpart.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
nftlcore.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
nftlmount.c [MTD] Rework the out of band handling completely 2006-05-29 15:06:51 +02:00
redboot.c [MTD] Fix build warnings in RedBoot MTD partition parser. 2006-05-16 17:31:15 +01:00
rfd_ftl.c [MTD] RFD FTL: Be noisier, and don't assume block without RFD magic are erased 2006-05-17 12:45:34 +01:00
ssfdc.c [MTD] Whitespace cleanup in SSFDC driver. 2006-09-23 16:20:48 +01:00