TAKE - Merge irix6.5f:irix:117830a (move m_peraglock locking)

[Eric Sandeen <sandeen@sgi.com>]

This fixes create performance dropoff as filesystems fill up.

Date:  Fri May  3 08:46:30 PDT 2002
Workarea:  stout.americas.sgi.com:/localhome/src/sandeen/2.4.x-xfs/workarea-alwaysclean

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:118173a
linux/fs/xfs/xfs_ialloc.c - 1.155
	- Merge irix6.5f:irix:117830a
	  Move the mrlock/mrunlock of m_peraglock outside of the for loop that
	  searches AGs for one with free space for inodes.

linux/fs/xfs/xfs_alloc.c - 1.149
	- Merge irix6.5f:irix:117830a
	  Move the mrlock/mrunlock of m_peraglock outside of the for loop that
	  searches AGs for one with space.  Fixes a near-full-filesystem
	  performance problem.