xfs: speed up free inode search
Don't search too far - abort if it is outside a certain radius and simply do a linear search for the first free inode. In AGs with a million inodes this can speed up allocation speed by 3-4x. [hch: ported to the new xfs_ialloc.c world order] Signed-off-by: NDave Chinner <dgc@sgi.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NAlex Elder <aelder@sgi.com> Signed-off-by: NFelix Blyakher <felixb@sgi.com>
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