diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 1edd3b6..9278e9a 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -558,7 +558,8 @@
 	int			i;
 
 	BUG_ON(PageWriteback(page));
-	set_page_writeback(page);
+	if (bh_count)
+		set_page_writeback(page);
 	if (clear_dirty)
 		clear_page_dirty(page);
 	unlock_page(page);
@@ -578,9 +579,6 @@
 
 		if (probed_page && clear_dirty)
 			wbc->nr_to_write--;	/* Wrote an "extra" page */
-	} else {
-		end_page_writeback(page);
-		wbc->pages_skipped++;	/* We didn't write this page */
 	}
 }
 
@@ -602,21 +600,26 @@
 {
 	struct buffer_head	*bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
 	xfs_iomap_t		*mp = iomapp, *tmp;
-	unsigned long		end, offset;
-	pgoff_t			end_index;
-	int			i = 0, index = 0;
+	unsigned long		offset, end_offset;
+	int			index = 0;
 	int			bbits = inode->i_blkbits;
+	int			len, page_dirty;
 
-	end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
-	if (page->index < end_index) {
-		end = PAGE_CACHE_SIZE;
-	} else {
-		end = i_size_read(inode) & (PAGE_CACHE_SIZE-1);
-	}
+	end_offset = (i_size_read(inode) & (PAGE_CACHE_SIZE - 1));
+
+	/*
+	 * page_dirty is initially a count of buffers on the page before
+	 * EOF and is decrememted as we move each into a cleanable state.
+	 */
+	len = 1 << inode->i_blkbits;
+	end_offset = max(end_offset, PAGE_CACHE_SIZE);
+	end_offset = roundup(end_offset, len);
+	page_dirty = end_offset / len;
+
+	offset = 0;
 	bh = head = page_buffers(page);
 	do {
-		offset = i << bbits;
-		if (offset >= end)
+		if (offset >= end_offset)
 			break;
 		if (!(PageUptodate(page) || buffer_uptodate(bh)))
 			continue;
@@ -625,6 +628,7 @@
 			if (startio) {
 				lock_buffer(bh);
 				bh_arr[index++] = bh;
+				page_dirty--;
 			}
 			continue;
 		}
@@ -657,10 +661,11 @@
 			unlock_buffer(bh);
 			mark_buffer_dirty(bh);
 		}
-	} while (i++, (bh = bh->b_this_page) != head);
+		page_dirty--;
+	} while (offset += len, (bh = bh->b_this_page) != head);
 
-	if (startio) {
-		xfs_submit_page(page, wbc, bh_arr, index, 1, index == i);
+	if (startio && index) {
+		xfs_submit_page(page, wbc, bh_arr, index, 1, !page_dirty);
 	} else {
 		unlock_page(page);
 	}
@@ -743,19 +748,22 @@
 		}
 	}
 
-	offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
 	end_offset = min_t(unsigned long long,
-			offset + PAGE_CACHE_SIZE, i_size_read(inode));
-
-	bh = head = page_buffers(page);
-	iomp = NULL;
+			(loff_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset);
+	offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
 
 	/*
-	 * page_dirty is initially a count of buffers on the page and
-	 * is decrememted as we move each into a cleanable state.
+	 * page_dirty is initially a count of buffers on the page before
+	 * EOF and is decrememted as we move each into a cleanable state.
 	 */
-	len = bh->b_size;
-	page_dirty = PAGE_CACHE_SIZE / len;
+	len = 1 << inode->i_blkbits;
+	p_offset = max(p_offset, PAGE_CACHE_SIZE);
+	p_offset = roundup(p_offset, len);
+	page_dirty = p_offset / len;
+
+	iomp = NULL;
+	p_offset = 0;
+	bh = head = page_buffers(page);
 
 	do {
 		if (offset >= end_offset)
@@ -877,8 +885,10 @@
 	if (uptodate && bh == head)
 		SetPageUptodate(page);
 
-	if (startio)
-		xfs_submit_page(page, wbc, bh_arr, cnt, 0, 1);
+	if (startio) {
+		WARN_ON(page_dirty);
+		xfs_submit_page(page, wbc, bh_arr, cnt, 0, !page_dirty);
+	}
 
 	if (iomp) {
 		offset = (iomp->iomap_offset + iomp->iomap_bsize - 1) >>
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 3826e8f..b291a2b 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -308,7 +308,8 @@
 			break;
 		}
 
-		error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, &imap, &nimaps);
+		error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
+						 &imap, &nimaps);
 		break;
 	case BMAPI_UNWRITTEN:
 		lockmode = 0;
@@ -746,6 +747,8 @@
 int
 xfs_iomap_write_allocate(
 	xfs_inode_t	*ip,
+	loff_t		offset,
+	size_t		count,
 	xfs_bmbt_irec_t *map,
 	int		*retmap)
 {
@@ -770,9 +773,9 @@
 	if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
 		return XFS_ERROR(error);
 
-	offset_fsb = map->br_startoff;
+	offset_fsb = XFS_B_TO_FSBT(mp, offset);
 	count_fsb = map->br_blockcount;
-	map_start_fsb = offset_fsb;
+	map_start_fsb = map->br_startoff;
 
 	XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
 
@@ -868,9 +871,9 @@
 					imap[i].br_startoff,
 				        imap[i].br_blockcount,imap[i].br_state);
                         }
-			if ((map->br_startoff >= imap[i].br_startoff) &&
-			    (map->br_startoff < (imap[i].br_startoff +
-						 imap[i].br_blockcount))) {
+			if ((offset_fsb >= imap[i].br_startoff) &&
+			    (offset_fsb < (imap[i].br_startoff +
+					   imap[i].br_blockcount))) {
 				*map = imap[i];
 				*retmap = 1;
 				XFS_STATS_INC(xs_xstrat_quick);
@@ -883,9 +886,8 @@
 		 * file, just surrounding data, try again.
 		 */
 		nimaps--;
-		offset_fsb = imap[nimaps].br_startoff +
-			     imap[nimaps].br_blockcount;
-		map_start_fsb = offset_fsb;
+		map_start_fsb = imap[nimaps].br_startoff +
+				imap[nimaps].br_blockcount;
 	}
 
 trans_cancel:
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
index 31c9108..287895a 100644
--- a/fs/xfs/xfs_iomap.h
+++ b/fs/xfs/xfs_iomap.h
@@ -29,9 +29,6 @@
  *
  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  */
-
-
-
 #ifndef __XFS_IOMAP_H__
 #define __XFS_IOMAP_H__
 
@@ -56,7 +53,7 @@
 	BMAPI_UNWRITTEN  = (1 << 3),	/* unwritten extents to real extents */
 	/* modifiers */
 	BMAPI_IGNSTATE = (1 << 4),	/* ignore unwritten state on read */
-	BMAPI_DIRECT = (1 << 5),		/* direct instead of buffered write */
+	BMAPI_DIRECT = (1 << 5),	/* direct instead of buffered write */
 	BMAPI_MMAP = (1 << 6),		/* allocate for mmap write */
 	BMAPI_SYNC = (1 << 7),		/* sync write to flush delalloc space */
 	BMAPI_TRYLOCK = (1 << 8),	/* non-blocking request */
@@ -100,7 +97,7 @@
 				  int, struct xfs_bmbt_irec *, int *, int);
 extern int xfs_iomap_write_delay(struct xfs_inode *, loff_t, size_t, int,
 				 struct xfs_bmbt_irec *, int *);
-extern int xfs_iomap_write_allocate(struct xfs_inode *,
+extern int xfs_iomap_write_allocate(struct xfs_inode *, loff_t, size_t,
 				struct xfs_bmbt_irec *, int *);
 extern int xfs_iomap_write_unwritten(struct xfs_inode *, loff_t, size_t);
 
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 1b96847..8ffb65d 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -216,7 +216,8 @@
 				void *, loff_t, size_t, int,
 				struct xfs_bmbt_irec *, int *);
 typedef int		(*xfs_iomap_write_allocate_t)(
-				void *, struct xfs_bmbt_irec *, int *);
+				void *, loff_t, size_t,
+				struct xfs_bmbt_irec *, int *);
 typedef int		(*xfs_iomap_write_unwritten_t)(
 				void *, loff_t, size_t);
 typedef uint		(*xfs_lck_map_shared_t)(void *);
@@ -258,9 +259,9 @@
 #define XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, flags, mval, nmap) \
 	(*(mp)->m_io_ops.xfs_iomap_write_delay) \
 		((io)->io_obj, offset, count, flags, mval, nmap)
-#define XFS_IOMAP_WRITE_ALLOCATE(mp, io, mval, nmap) \
+#define XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, mval, nmap) \
 	(*(mp)->m_io_ops.xfs_iomap_write_allocate) \
-		((io)->io_obj, mval, nmap)
+		((io)->io_obj, offset, count, mval, nmap)
 #define XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count) \
 	(*(mp)->m_io_ops.xfs_iomap_write_unwritten) \
 		((io)->io_obj, offset, count)