[PATCH 2/2] xfs: use scalable vmap API

[Alex Elder]

Re-apply a commit that had been reverted due to regressions
that have since been fixed.

    From 95f8e302c04c0b0c6de35ab399a5551605eeb006 Mon Sep 17 00:00:00 2001
    From: Nick Piggin <npiggin at suse.de>
    Date: Tue, 6 Jan 2009 14:43:09 +1100

    Implement XFS's large buffer support with the new vmap APIs. See the vmap
    rewrite (db64fe02) for some numbers. The biggest improvement that comes from
    using the new APIs is avoiding the global KVA allocation lock on every call.

    Signed-off-by: Nick Piggin <npiggin at suse.de>
    Reviewed-by: Christoph Hellwig <hch at infradead.org>
    Signed-off-by: Lachlan McIlroy <lachlan at sgi.com>

Only modifications here were a minor reformat, plus making the patch
apply given the new use of xfs_buf_is_vmapped().

Modified-by: Alex Elder <aelder at sgi.com>

---
 fs/xfs/linux-2.6/xfs_buf.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: b/fs/xfs/linux-2.6/xfs_buf.c
===================================================================
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -268,7 +268,8 @@ xfs_buf_free(
 		uint		i;
 
 		if (xfs_buf_is_vmapped(bp))
-			vunmap(bp->b_addr - bp->b_offset);
+			vm_unmap_ram(bp->b_addr - bp->b_offset,
+					bp->b_page_count);
 
 		for (i = 0; i < bp->b_page_count; i++) {
 			struct page	*page = bp->b_pages[i];
@@ -388,8 +389,8 @@ _xfs_buf_map_pages(
 		bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
 		bp->b_flags |= XBF_MAPPED;
 	} else if (flags & XBF_MAPPED) {
-		bp->b_addr = vmap(bp->b_pages, bp->b_page_count,
-					VM_MAP, PAGE_KERNEL);
+		bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
+					-1, PAGE_KERNEL);
 		if (unlikely(bp->b_addr == NULL))
 			return -ENOMEM;
 		bp->b_addr += bp->b_offset;