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    block: clean up blkdev_get() wrappers and their users · d4d77629
    Tejun Heo 提交于
    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: NTejun 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>
    d4d77629
super.c 133.2 KB