GFS2: Get rid of I_MUTEX_QUOTA usage
GFS2 uses i_mutex on its system quota inode to synchronize writes to quota file. Since this is an internal inode to GFS2 (not part of directory hiearchy or visible by user) we are safe to define locking rules for it. So let's just get it its own locking class to make it clear. Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NJ. Bruce Fields <bfields@redhat.com> Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>
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