block: clean up blkdev_get() wrappers and their users
commitd4d77629953eabd3c14f6fa5746f6b28babfc55f
authorTejun Heo <tj@kernel.org>
Sat, 13 Nov 2010 10:55:18 +0000 (13 11:55 +0100)
committerTejun Heo <tj@kernel.org>
Sat, 13 Nov 2010 10:55:18 +0000 (13 11:55 +0100)
tree38cce0d4764ecb34a9f7f49332959780e28bb786
parent75f1dc0d076d1c1168f2115f1941ea627d38bd5a
block: clean up blkdev_get() wrappers and their users

After recent blkdev_get() modifications, open_by_devnum() and
open_bdev_exclusive() are simple wrappers around blkdev_get().
Replace them with blkdev_get_by_dev() and blkdev_get_by_path().

blkdev_get_by_dev() is identical to open_by_devnum().
blkdev_get_by_path() is slightly different in that it doesn't
automatically add %FMODE_EXCL to @mode.

All users are converted.  Most conversions are mechanical and don't
introduce any behavior difference.  There are several exceptions.

* btrfs now sets FMODE_EXCL in btrfs_device->mode, so there's no
  reason to OR it explicitly on blkdev_put().

* gfs2, nilfs2 and the generic mount_bdev() now set FMODE_EXCL in
  sb->s_mode.

* With the above changes, sb->s_mode now always should contain
  FMODE_EXCL.  WARN_ON_ONCE() added to kill_block_super() to detect
  errors.

The new blkdev_get_*() functions are with proper docbook comments.
While at it, add function description to blkdev_get() too.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Philipp Reisner <philipp.reisner@linbit.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Joern Engel <joern@lazybastard.org>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Jan Kara <jack@suse.cz>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp>
Cc: reiserfs-devel@vger.kernel.org
Cc: xfs-masters@oss.sgi.com
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
18 files changed:
drivers/block/drbd/drbd_nl.c
drivers/md/dm-table.c
drivers/md/md.c
drivers/mtd/devices/block2mtd.c
fs/block_dev.c
fs/btrfs/volumes.c
fs/btrfs/volumes.h
fs/ext3/super.c
fs/ext4/super.c
fs/gfs2/ops_fstype.c
fs/jfs/jfs_logmgr.c
fs/logfs/dev_bdev.c
fs/nilfs2/super.c
fs/reiserfs/journal.c
fs/super.c
fs/xfs/linux-2.6/xfs_super.c
include/linux/fs.h
kernel/power/swap.c