linux.git/block/Kconfig, branch v4.8-rc2

block: remove BLK_DEV_DAX config option

2016-08-04T12:50:07+00:00

The functionality for block device DAX was already removed with commit
acc93d30d7d4 ("Revert "block: enable dax for raw block devices"")

However, we still had a config option hanging around that was always
disabled because it depended on CONFIG_BROKEN.  This config option was
introduced in commit 03cdadb04077 ("block: disable block device DAX by
default")

This change reverts that commit, removing the dead config option.

Link: http://lkml.kernel.org/r/20160729182314.6368-1-ross.zwisler@linux.intel.com
Signed-off-by: Ross Zwisler 
Cc: Dave Hansen 
Acked-by: Dan Williams 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: disable block device DAX by default

2016-02-27T18:28:52+00:00

The recent *sync enabling discovered that we are inserting into the
block_device pagecache counter to the expectations of the dirty data
tracking for dax mappings.  This can lead to data corruption.

We want to support DAX for block devices eventually, but it requires
wider changes to properly manage the pagecache.

   dump_stack+0x85/0xc2
   dax_writeback_mapping_range+0x60/0xe0
   blkdev_writepages+0x3f/0x50
   do_writepages+0x21/0x30
   __filemap_fdatawrite_range+0xc6/0x100
   filemap_write_and_wait+0x4a/0xa0
   set_blocksize+0x70/0xd0
   sb_set_blocksize+0x1d/0x50
   ext4_fill_super+0x75b/0x3360
   mount_bdev+0x180/0x1b0
   ext4_mount+0x15/0x20
   mount_fs+0x38/0x170

Mark the support broken so its disabled by default, but otherwise still
available for testing.

Signed-off-by: Dan Williams 
Signed-off-by: Ross Zwisler 
Reported-by: Ross Zwisler 
Suggested-by: Dave Chinner 
Reviewed-by: Jan Kara 
Cc: Jens Axboe 
Cc: Matthew Wilcox 
Cc: Al Viro 
Cc: Theodore Ts'o 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: Add T10 Protection Information functions

2014-09-27T15:14:59+00:00

The T10 Protection Information format is also used by some devices that
do not go through the SCSI layer (virtual block devices, NVMe). Relocate
the relevant functions to a block layer library that can be used without
involving SCSI.

Signed-off-by: Martin K. Petersen 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: change config option name for cmdline partition parsing

2013-09-30T21:31:02+00:00

Recently commit bab55417b10c ("block: support embedded device command
line partition") introduced CONFIG_CMDLINE_PARSER.  However, that name
is too generic and sounds like it enables/disables generic kernel boot
arg processing, when it really is block specific.

Before this option becomes a part of a full/final release, add the BLK_
prefix to it so that it is clear in absence of any other context that it
is block specific.

In addition, fix up the following less critical items:
 - help text was not really at all helpful.
 - index file for Documentation was not updated
 - add the new arg to Documentation/kernel-parameters.txt
 - clarify wording in source comments

Signed-off-by: Paul Gortmaker 
Cc: Jens Axboe 
Cc: Cai Zhiyong 
Cc: Wei Yongjun 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: support embedded device command line partition

2013-09-11T22:56:57+00:00

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 
Cc: Karel Zak 
Cc: "Wanglin (Albert)" 
Cc: Marius Groeger 
Cc: David Woodhouse 
Cc: Jens Axboe 
Cc: Brian Norris 
Cc: Artem Bityutskiy 
Signed-off-by: Wei Yongjun 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: don't select PERCPU_RWSEM

2013-02-22T09:42:45+00:00

The block device doesn't use percpu rw-semaphore anymore, so don't select
it for compilation.

Signed-off-by: Mikulas Patocka 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Jens Axboe

percpu_rw_semaphore: introduce CONFIG_PERCPU_RWSEM

2012-12-18T01:15:18+00:00

Currently only block_dev and uprobes use percpu_rw_semaphore,
add the config option selected by BLOCK || UPROBES.

Signed-off-by: Oleg Nesterov 
Cc: Anton Arapov 
Cc: Ingo Molnar 
Cc: Linus Torvalds 
Cc: Michal Marek 
Cc: Mikulas Patocka 
Cc: "Paul E. McKenney" 
Cc: Peter Zijlstra 
Cc: Srikar Dronamraju 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: remove CONFIG_EXPERIMENTAL

2012-10-23T20:30:34+00:00

This config item has not carried much meaning for a while now and is
almost always enabled by default. As agreed during the Linux kernel
summit, remove it.

CC: Jens Axboe 
Signed-off-by: Kees Cook 
Signed-off-by: Jens Axboe

move fs/partitions to block/

2012-01-04T03:54:06+00:00

Signed-off-by: Al Viro

block: add bsg helper library

2011-07-31T20:05:09+00:00

This moves the FC classes bsg code to the block layer and
makes it a lib so that other classes like iscsi and SAS can use it.

It is helpful because working with the request queue, bios,
creating scatterlists, etc are a pain that the LLD does not
have to worry about with normal IOs and should not have to
worry about for bsg requests.

Signed-off-by: Mike Christie 
Signed-off-by: Jens Axboe