[PATCH 0/2] xfs: RCU inode freeing and lookups V2

[Dave Chinner]

This series converts the XFS inode cache to use SLAB_DESTROY_BY_RCU
for freeing of the inodes and uses RCU locking for all the lookups.
It uses the ip->i_ino values and ip->i_flags & XFS_IRECLAIM being
checked under the ip->i_flags_lock to detect inodes that have been
freed during lookups.

Version 2:

- check ip->i_ino under i_flags lock on cache hit
- remove duplicate ip->i_ino == 0 check in xfs_dqrele_inode
- Fixed inode cluster walks to check for valid i_ino under
  i_flags_lock.
- Fixed ag walk lookups to check i_ino under i_flags_lock.