1 files changed, 11 insertions, 6 deletions

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index df0cba239dd5..58286b1d733b 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.  All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License as
@@ -1249,8 +1249,8 @@ bio_end_io_pagebuf(
         int                     error)
 {
         xfs_buf_t               *pb = (xfs_buf_t *)bio->bi_private;
-        unsigned int            i, blocksize = pb->pb_target->pbr_bsize;
-        struct bio_vec          *bvec = bio->bi_io_vec;
+        unsigned int            blocksize = pb->pb_target->pbr_bsize;
+        struct bio_vec          *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
 
         if (bio->bi_size)
                 return 1;
@@ -1258,10 +1258,12 @@ bio_end_io_pagebuf(
         if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
                 pb->pb_error = EIO;
 
-        for (i = 0; i < bio->bi_vcnt; i++, bvec++) {
+        do {
                 struct page     *page = bvec->bv_page;
 
-                if (pb->pb_error) {
+                if (unlikely(pb->pb_error)) {
+                        if (pb->pb_flags & PBF_READ)
+                                ClearPageUptodate(page);
                         SetPageError(page);
                 } else if (blocksize == PAGE_CACHE_SIZE) {
                         SetPageUptodate(page);
@@ -1270,10 +1272,13 @@ bio_end_io_pagebuf(
                         set_page_region(page, bvec->bv_offset, bvec->bv_len);
                 }
 
+                if (--bvec >= bio->bi_io_vec)
+                        prefetchw(&bvec->bv_page->flags);
+
                 if (_pagebuf_iolocked(pb)) {
                         unlock_page(page);
                 }
-        }
+        } while (bvec >= bio->bi_io_vec);
 
         _pagebuf_iodone(pb, 1);
         bio_put(bio);