Merge git://oss.sgi.com:8090/oss/git/xfs-2.6

15 files changed, 1698 insertions, 1732 deletions

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 94d3cdfbf9b8..d1db8c17a74e 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -40,11 +40,10 @@
 #include "xfs_rw.h"
 #include "xfs_iomap.h"
 #include <linux/mpage.h>
+#include <linux/pagevec.h>
 #include <linux/writeback.h>
 
 STATIC void xfs_count_page_state(struct page *, int *, int *, int *);
-STATIC void xfs_convert_page(struct inode *, struct page *, xfs_iomap_t *,
-		struct writeback_control *wbc, void *, int, int);
 
 #if defined(XFS_RW_TRACE)
 void
@@ -55,17 +54,15 @@ xfs_page_trace(
 	int		mask)
 {
 	xfs_inode_t	*ip;
-	bhv_desc_t	*bdp;
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	loff_t		isize = i_size_read(inode);
-	loff_t		offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
+	loff_t		offset = page_offset(page);
 	int		delalloc = -1, unmapped = -1, unwritten = -1;
 
 	if (page_has_buffers(page))
 		xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
 
-	bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
-	ip = XFS_BHVTOI(bdp);
+	ip = xfs_vtoi(vp);
 	if (!ip->i_rwtrace)
 		return;
 
@@ -103,15 +100,56 @@ xfs_finish_ioend(
 		queue_work(xfsdatad_workqueue, &ioend->io_work);
 }
 
+/*
+ * We're now finished for good with this ioend structure.
+ * Update the page state via the associated buffer_heads,
+ * release holds on the inode and bio, and finally free
+ * up memory.  Do not use the ioend after this.
+ */
 STATIC void
 xfs_destroy_ioend(
 	xfs_ioend_t		*ioend)
 {
+	struct buffer_head	*bh, *next;
+
+	for (bh = ioend->io_buffer_head; bh; bh = next) {
+		next = bh->b_private;
+		bh->b_end_io(bh, ioend->io_uptodate);
+	}
+
 	vn_iowake(ioend->io_vnode);
 	mempool_free(ioend, xfs_ioend_pool);
 }
 
 /*
+ * Buffered IO write completion for delayed allocate extents.
+ * TODO: Update ondisk isize now that we know the file data
+ * has been flushed (i.e. the notorious "NULL file" problem).
+ */
+STATIC void
+xfs_end_bio_delalloc(
+	void			*data)
+{
+	xfs_ioend_t		*ioend = data;
+
+	xfs_destroy_ioend(ioend);
+}
+
+/*
+ * Buffered IO write completion for regular, written extents.
+ */
+STATIC void
+xfs_end_bio_written(
+	void			*data)
+{
+	xfs_ioend_t		*ioend = data;
+
+	xfs_destroy_ioend(ioend);
+}
+
+/*
+ * IO write completion for unwritten extents.
+ *
  * Issue transactions to convert a buffer range from unwritten
  * to written extents.
  */
@@ -123,21 +161,10 @@ xfs_end_bio_unwritten(
 	vnode_t			*vp = ioend->io_vnode;
 	xfs_off_t		offset = ioend->io_offset;
 	size_t			size = ioend->io_size;
-	struct buffer_head	*bh, *next;
 	int			error;
 
 	if (ioend->io_uptodate)
 		VOP_BMAP(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL, error);
-
-	/* ioend->io_buffer_head is only non-NULL for buffered I/O */
-	for (bh = ioend->io_buffer_head; bh; bh = next) {
-		next = bh->b_private;
-
-		bh->b_end_io = NULL;
-		clear_buffer_unwritten(bh);
-		end_buffer_async_write(bh, ioend->io_uptodate);
-	}
-
 	xfs_destroy_ioend(ioend);
 }
 
@@ -149,7 +176,8 @@ xfs_end_bio_unwritten(
  */
 STATIC xfs_ioend_t *
 xfs_alloc_ioend(
-	struct inode		*inode)
+	struct inode		*inode,
+	unsigned int		type)
 {
 	xfs_ioend_t		*ioend;
 
@@ -162,45 +190,25 @@ xfs_alloc_ioend(
 	 */
 	atomic_set(&ioend->io_remaining, 1);
 	ioend->io_uptodate = 1; /* cleared if any I/O fails */
+	ioend->io_list = NULL;
+	ioend->io_type = type;
 	ioend->io_vnode = LINVFS_GET_VP(inode);
 	ioend->io_buffer_head = NULL;
+	ioend->io_buffer_tail = NULL;
 	atomic_inc(&ioend->io_vnode->v_iocount);
 	ioend->io_offset = 0;
 	ioend->io_size = 0;
 
-	INIT_WORK(&ioend->io_work, xfs_end_bio_unwritten, ioend);
+	if (type == IOMAP_UNWRITTEN)
+		INIT_WORK(&ioend->io_work, xfs_end_bio_unwritten, ioend);
+	else if (type == IOMAP_DELAY)
+		INIT_WORK(&ioend->io_work, xfs_end_bio_delalloc, ioend);
+	else
+		INIT_WORK(&ioend->io_work, xfs_end_bio_written, ioend);
 
 	return ioend;
 }
 
-void
-linvfs_unwritten_done(
-	struct buffer_head	*bh,
-	int			uptodate)
-{
-	xfs_ioend_t		*ioend = bh->b_private;
-	static spinlock_t	unwritten_done_lock = SPIN_LOCK_UNLOCKED;
-	unsigned long		flags;
-
-	ASSERT(buffer_unwritten(bh));
-	bh->b_end_io = NULL;
-
-	if (!uptodate)
-		ioend->io_uptodate = 0;
-
-	/*
-	 * Deep magic here.  We reuse b_private in the buffer_heads to build
-	 * a chain for completing the I/O from user context after we've issued
-	 * a transaction to convert the unwritten extent.
-	 */
-	spin_lock_irqsave(&unwritten_done_lock, flags);
-	bh->b_private = ioend->io_buffer_head;
-	ioend->io_buffer_head = bh;
-	spin_unlock_irqrestore(&unwritten_done_lock, flags);
-
-	xfs_finish_ioend(ioend);
-}
-
 STATIC int
 xfs_map_blocks(
 	struct inode		*inode,
@@ -218,138 +226,260 @@ xfs_map_blocks(
 	return -error;
 }
 
+STATIC inline int
+xfs_iomap_valid(
+	xfs_iomap_t		*iomapp,
+	loff_t			offset)
+{
+	return offset >= iomapp->iomap_offset &&
+		offset < iomapp->iomap_offset + iomapp->iomap_bsize;
+}
+
 /*
- * Finds the corresponding mapping in block @map array of the
- * given @offset within a @page.
+ * BIO completion handler for buffered IO.
  */
-STATIC xfs_iomap_t *
-xfs_offset_to_map(
+STATIC int
+xfs_end_bio(
+	struct bio		*bio,
+	unsigned int		bytes_done,
+	int			error)
+{
+	xfs_ioend_t		*ioend = bio->bi_private;
+
+	if (bio->bi_size)
+		return 1;
+
+	ASSERT(ioend);
+	ASSERT(atomic_read(&bio->bi_cnt) >= 1);
+
+	/* Toss bio and pass work off to an xfsdatad thread */
+	if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+		ioend->io_uptodate = 0;
+	bio->bi_private = NULL;
+	bio->bi_end_io = NULL;
+
+	bio_put(bio);
+	xfs_finish_ioend(ioend);
+	return 0;
+}
+
+STATIC void
+xfs_submit_ioend_bio(
+	xfs_ioend_t	*ioend,
+	struct bio	*bio)
+{
+	atomic_inc(&ioend->io_remaining);
+
+	bio->bi_private = ioend;
+	bio->bi_end_io = xfs_end_bio;
+
+	submit_bio(WRITE, bio);
+	ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP));
+	bio_put(bio);
+}
+
+STATIC struct bio *
+xfs_alloc_ioend_bio(
+	struct buffer_head	*bh)
+{
+	struct bio		*bio;
+	int			nvecs = bio_get_nr_vecs(bh->b_bdev);
+
+	do {
+		bio = bio_alloc(GFP_NOIO, nvecs);
+		nvecs >>= 1;
+	} while (!bio);
+
+	ASSERT(bio->bi_private == NULL);
+	bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
+	bio->bi_bdev = bh->b_bdev;
+	bio_get(bio);
+	return bio;
+}
+
+STATIC void
+xfs_start_buffer_writeback(
+	struct buffer_head	*bh)
+{
+	ASSERT(buffer_mapped(bh));
+	ASSERT(buffer_locked(bh));
+	ASSERT(!buffer_delay(bh));
+	ASSERT(!buffer_unwritten(bh));
+
+	mark_buffer_async_write(bh);
+	set_buffer_uptodate(bh);
+	clear_buffer_dirty(bh);
+}
+
+STATIC void
+xfs_start_page_writeback(
 	struct page		*page,
-	xfs_iomap_t		*iomapp,
-	unsigned long		offset)
+	struct writeback_control *wbc,
+	int			clear_dirty,
+	int			buffers)
+{
+	ASSERT(PageLocked(page));
+	ASSERT(!PageWriteback(page));
+	set_page_writeback(page);
+	if (clear_dirty)
+		clear_page_dirty(page);
+	unlock_page(page);
+	if (!buffers) {
+		end_page_writeback(page);
+		wbc->pages_skipped++;	/* We didn't write this page */
+	}
+}
+
+static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh)
+{
+	return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));
+}
+
+/*
+ * Submit all of the bios for all of the ioends we have saved up,
+ * covering the initial writepage page and also any probed pages.
+ */
+STATIC void
+xfs_submit_ioend(
+	xfs_ioend_t		*ioend)
+{
+	xfs_ioend_t		*next;
+	struct buffer_head	*bh;
+	struct bio		*bio;
+	sector_t		lastblock = 0;
+
+	do {
+		next = ioend->io_list;
+		bio = NULL;
+
+		for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) {
+			xfs_start_buffer_writeback(bh);
+
+			if (!bio) {
+ retry:
+				bio = xfs_alloc_ioend_bio(bh);
+			} else if (bh->b_blocknr != lastblock + 1) {
+				xfs_submit_ioend_bio(ioend, bio);
+				goto retry;
+			}
+
+			if (bio_add_buffer(bio, bh) != bh->b_size) {
+				xfs_submit_ioend_bio(ioend, bio);
+				goto retry;
+			}
+
+			lastblock = bh->b_blocknr;
+		}
+		if (bio)
+			xfs_submit_ioend_bio(ioend, bio);
+		xfs_finish_ioend(ioend);
+	} while ((ioend = next) != NULL);
+}
+
+/*
+ * Cancel submission of all buffer_heads so far in this endio.
+ * Toss the endio too.  Only ever called for the initial page
+ * in a writepage request, so only ever one page.
+ */
+STATIC void
+xfs_cancel_ioend(
+	xfs_ioend_t		*ioend)
+{
+	xfs_ioend_t		*next;
+	struct buffer_head	*bh, *next_bh;
+
+	do {
+		next = ioend->io_list;
+		bh = ioend->io_buffer_head;
+		do {
+			next_bh = bh->b_private;
+			clear_buffer_async_write(bh);
+			unlock_buffer(bh);
+		} while ((bh = next_bh) != NULL);
+
+		vn_iowake(ioend->io_vnode);
+		mempool_free(ioend, xfs_ioend_pool);
+	} while ((ioend = next) != NULL);
+}
+
+/*
+ * Test to see if we've been building up a completion structure for
+ * earlier buffers -- if so, we try to append to this ioend if we
+ * can, otherwise we finish off any current ioend and start another.
+ * Return true if we've finished the given ioend.
+ */
+STATIC void
+xfs_add_to_ioend(
+	struct inode		*inode,
+	struct buffer_head	*bh,
+	xfs_off_t		offset,
+	unsigned int		type,
+	xfs_ioend_t		**result,
+	int			need_ioend)
 {
-	loff_t			full_offset;	/* offset from start of file */
+	xfs_ioend_t		*ioend = *result;
 
-	ASSERT(offset < PAGE_CACHE_SIZE);
+	if (!ioend || need_ioend || type != ioend->io_type) {
+		xfs_ioend_t	*previous = *result;
 
-	full_offset = page->index;		/* NB: using 64bit number */
-	full_offset <<= PAGE_CACHE_SHIFT;	/* offset from file start */
-	full_offset += offset;			/* offset from page start */
+		ioend = xfs_alloc_ioend(inode, type);
+		ioend->io_offset = offset;
+		ioend->io_buffer_head = bh;
+		ioend->io_buffer_tail = bh;
+		if (previous)
+			previous->io_list = ioend;
+		*result = ioend;
+	} else {
+		ioend->io_buffer_tail->b_private = bh;
+		ioend->io_buffer_tail = bh;
+	}
 
-	if (full_offset < iomapp->iomap_offset)
-		return NULL;
-	if (iomapp->iomap_offset + (iomapp->iomap_bsize -1) >= full_offset)
-		return iomapp;
-	return NULL;
+	bh->b_private = NULL;
+	ioend->io_size += bh->b_size;
 }
 
 STATIC void
 xfs_map_at_offset(
-	struct page		*page,
 	struct buffer_head	*bh,
-	unsigned long		offset,
+	loff_t			offset,
 	int			block_bits,
 	xfs_iomap_t		*iomapp)
 {
 	xfs_daddr_t		bn;
-	loff_t			delta;
 	int			sector_shift;
 
 	ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE));
 	ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY));
 	ASSERT(iomapp->iomap_bn != IOMAP_DADDR_NULL);
 
-	delta = page->index;
-	delta <<= PAGE_CACHE_SHIFT;
-	delta += offset;
-	delta -= iomapp->iomap_offset;
-	delta >>= block_bits;
-
 	sector_shift = block_bits - BBSHIFT;
-	bn = iomapp->iomap_bn >> sector_shift;
-	bn += delta;
-	BUG_ON(!bn && !(iomapp->iomap_flags & IOMAP_REALTIME));
+	bn = (iomapp->iomap_bn >> sector_shift) +
+	      ((offset - iomapp->iomap_offset) >> block_bits);
+
+	ASSERT(bn || (iomapp->iomap_flags & IOMAP_REALTIME));
 	ASSERT((bn << sector_shift) >= iomapp->iomap_bn);
 
 	lock_buffer(bh);
 	bh->b_blocknr = bn;
-	bh->b_bdev = iomapp->iomap_target->pbr_bdev;
+	bh->b_bdev = iomapp->iomap_target->bt_bdev;
 	set_buffer_mapped(bh);
 	clear_buffer_delay(bh);
+	clear_buffer_unwritten(bh);
 }
 
 /*
- * Look for a page at index which is unlocked and contains our
- * unwritten extent flagged buffers at its head.  Returns page
- * locked and with an extra reference count, and length of the
- * unwritten extent component on this page that we can write,
- * in units of filesystem blocks.
- */
-STATIC struct page *
-xfs_probe_unwritten_page(
-	struct address_space	*mapping,
-	pgoff_t			index,
-	xfs_iomap_t		*iomapp,
-	xfs_ioend_t		*ioend,
-	unsigned long		max_offset,
-	unsigned long		*fsbs,
-	unsigned int            bbits)
-{
-	struct page		*page;
-
-	page = find_trylock_page(mapping, index);
-	if (!page)
-		return NULL;
-	if (PageWriteback(page))
-		goto out;
-
-	if (page->mapping && page_has_buffers(page)) {
-		struct buffer_head	*bh, *head;
-		unsigned long		p_offset = 0;
-
-		*fsbs = 0;
-		bh = head = page_buffers(page);
-		do {
-			if (!buffer_unwritten(bh) || !buffer_uptodate(bh))
-				break;
-			if (!xfs_offset_to_map(page, iomapp, p_offset))
-				break;
-			if (p_offset >= max_offset)
-				break;
-			xfs_map_at_offset(page, bh, p_offset, bbits, iomapp);
-			set_buffer_unwritten_io(bh);
-			bh->b_private = ioend;
-			p_offset += bh->b_size;
-			(*fsbs)++;
-		} while ((bh = bh->b_this_page) != head);
-
-		if (p_offset)
-			return page;
-	}
-
-out:
-	unlock_page(page);
-	return NULL;
-}
-
-/*
- * Look for a page at index which is unlocked and not mapped
- * yet - clustering for mmap write case.
+ * Look for a page at index that is suitable for clustering.
  */
 STATIC unsigned int
-xfs_probe_unmapped_page(
-	struct address_space	*mapping,
-	pgoff_t			index,
-	unsigned int		pg_offset)
+xfs_probe_page(
+	struct page		*page,
+	unsigned int		pg_offset,
+	int			mapped)
 {
-	struct page		*page;
 	int			ret = 0;
 
-	page = find_trylock_page(mapping, index);
-	if (!page)
-		return 0;
 	if (PageWriteback(page))
-		goto out;
+		return 0;
 
 	if (page->mapping && PageDirty(page)) {
 		if (page_has_buffers(page)) {
@@ -357,79 +487,101 @@ xfs_probe_unmapped_page(
 
 			bh = head = page_buffers(page);
 			do {
-				if (buffer_mapped(bh) || !buffer_uptodate(bh))
+				if (!buffer_uptodate(bh))
+					break;
+				if (mapped != buffer_mapped(bh))
 					break;
 				ret += bh->b_size;
 				if (ret >= pg_offset)
 					break;
 			} while ((bh = bh->b_this_page) != head);
 		} else
-			ret = PAGE_CACHE_SIZE;
+			ret = mapped ? 0 : PAGE_CACHE_SIZE;
 	}
 
-out:
-	unlock_page(page);
 	return ret;
 }
 
-STATIC unsigned int
-xfs_probe_unmapped_cluster(
+STATIC size_t
+xfs_probe_cluster(
 	struct inode		*inode,
 	struct page		*startpage,
 	struct buffer_head	*bh,
-	struct buffer_head	*head)
+	struct buffer_head	*head,
+	int			mapped)
 {
+	struct pagevec		pvec;
 	pgoff_t			tindex, tlast, tloff;
-	unsigned int		pg_offset, len, total = 0;
-	struct address_space	*mapping = inode->i_mapping;
+	size_t			total = 0;
+	int			done = 0, i;
 
 	/* First sum forwards in this page */
 	do {
-		if (buffer_mapped(bh))
-			break;
+		if (mapped != buffer_mapped(bh))
+			return total;
 		total += bh->b_size;
 	} while ((bh = bh->b_this_page) != head);
 
-	/* If we reached the end of the page, sum forwards in
-	 * following pages.
-	 */
-	if (bh == head) {
-		tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
-		/* Prune this back to avoid pathological behavior */
-		tloff = min(tlast, startpage->index + 64);
-		for (tindex = startpage->index + 1; tindex < tloff; tindex++) {
-			len = xfs_probe_unmapped_page(mapping, tindex,
-							PAGE_CACHE_SIZE);
-			if (!len)
-				return total;
+	/* if we reached the end of the page, sum forwards in following pages */
+	tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
+	tindex = startpage->index + 1;
+
+	/* Prune this back to avoid pathological behavior */
+	tloff = min(tlast, startpage->index + 64);
+
+	pagevec_init(&pvec, 0);
+	while (!done && tindex <= tloff) {
+		unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1);
+
+		if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len))
+			break;
+
+		for (i = 0; i < pagevec_count(&pvec); i++) {
+			struct page *page = pvec.pages[i];
+			size_t pg_offset, len = 0;
+
+			if (tindex == tlast) {
+				pg_offset =
+				    i_size_read(inode) & (PAGE_CACHE_SIZE - 1);
+				if (!pg_offset) {
+					done = 1;
+					break;
+				}
+			} else
+				pg_offset = PAGE_CACHE_SIZE;
+
+			if (page->index == tindex && !TestSetPageLocked(page)) {
+				len = xfs_probe_page(page, pg_offset, mapped);
+				unlock_page(page);
+			}
+
+			if (!len) {
+				done = 1;
+				break;
+			}
+
 			total += len;
+			tindex++;
 		}
-		if (tindex == tlast &&
-		    (pg_offset = i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) {
-			total += xfs_probe_unmapped_page(mapping,
-							tindex, pg_offset);
-		}
+
+		pagevec_release(&pvec);
+		cond_resched();
 	}
+
 	return total;
 }
 
 /*
- * Probe for a given page (index) in the inode and test if it is delayed
- * and without unwritten buffers.  Returns page locked and with an extra
- * reference count.
+ * Test if a given page is suitable for writing as part of an unwritten
+ * or delayed allocate extent.
  */
-STATIC struct page *
-xfs_probe_delalloc_page(
-	struct inode		*inode,
-	pgoff_t			index)
+STATIC int
+xfs_is_delayed_page(
+	struct page		*page,
+	unsigned int		type)
 {
-	struct page		*page;
-
-	page = find_trylock_page(inode->i_mapping, index);
-	if (!page)
-		return NULL;
 	if (PageWriteback(page))
-		goto out;
+		return 0;
 
 	if (page->mapping && page_has_buffers(page)) {
 		struct buffer_head	*bh, *head;
@@ -437,243 +589,156 @@ xfs_probe_delalloc_page(
 
 		bh = head = page_buffers(page);
 		do {
-			if (buffer_unwritten(bh)) {
-				acceptable = 0;
+			if (buffer_unwritten(bh))
+				acceptable = (type == IOMAP_UNWRITTEN);
+			else if (buffer_delay(bh))
+				acceptable = (type == IOMAP_DELAY);
+			else if (buffer_mapped(bh))
+				acceptable = (type == 0);
+			else
 				break;
-			} else if (buffer_delay(bh)) {
-				acceptable = 1;
-			}
 		} while ((bh = bh->b_this_page) != head);
 
 		if (acceptable)
-			return page;
-	}
-
-out:
-	unlock_page(page);
-	return NULL;
-}
-
-STATIC int
-xfs_map_unwritten(
-	struct inode		*inode,
-	struct page		*start_page,
-	struct buffer_head	*head,
-	struct buffer_head	*curr,
-	unsigned long		p_offset,
-	int			block_bits,
-	xfs_iomap_t		*iomapp,
-	struct writeback_control *wbc,
-	int			startio,
-	int			all_bh)
-{
-	struct buffer_head	*bh = curr;
-	xfs_iomap_t		*tmp;
-	xfs_ioend_t		*ioend;
-	loff_t			offset;
-	unsigned long		nblocks = 0;
-
-	offset = start_page->index;
-	offset <<= PAGE_CACHE_SHIFT;
-	offset += p_offset;
-
-	ioend = xfs_alloc_ioend(inode);
-
-	/* First map forwards in the page consecutive buffers
-	 * covering this unwritten extent
-	 */
-	do {
-		if (!buffer_unwritten(bh))
-			break;
-		tmp = xfs_offset_to_map(start_page, iomapp, p_offset);
-		if (!tmp)
-			break;
-		xfs_map_at_offset(start_page, bh, p_offset, block_bits, iomapp);
-		set_buffer_unwritten_io(bh);
-		bh->b_private = ioend;
-		p_offset += bh->b_size;
-		nblocks++;
-	} while ((bh = bh->b_this_page) != head);
-
-	atomic_add(nblocks, &ioend->io_remaining);
-
-	/* If we reached the end of the page, map forwards in any
-	 * following pages which are also covered by this extent.
-	 */
-	if (bh == head) {
-		struct address_space	*mapping = inode->i_mapping;
-		pgoff_t			tindex, tloff, tlast;
-		unsigned long		bs;
-		unsigned int		pg_offset, bbits = inode->i_blkbits;
-		struct page		*page;
-
-		tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
-		tloff = (iomapp->iomap_offset + iomapp->iomap_bsize) >> PAGE_CACHE_SHIFT;
-		tloff = min(tlast, tloff);
-		for (tindex = start_page->index + 1; tindex < tloff; tindex++) {
-			page = xfs_probe_unwritten_page(mapping,
-						tindex, iomapp, ioend,
-						PAGE_CACHE_SIZE, &bs, bbits);
-			if (!page)
-				break;
-			nblocks += bs;
-			atomic_add(bs, &ioend->io_remaining);
-			xfs_convert_page(inode, page, iomapp, wbc, ioend,
-							startio, all_bh);
-			/* stop if converting the next page might add
-			 * enough blocks that the corresponding byte
-			 * count won't fit in our ulong page buf length */
-			if (nblocks >= ((ULONG_MAX - PAGE_SIZE) >> block_bits))
-				goto enough;
-		}
-
-		if (tindex == tlast &&
-		    (pg_offset = (i_size_read(inode) & (PAGE_CACHE_SIZE - 1)))) {
-			page = xfs_probe_unwritten_page(mapping,
-							tindex, iomapp, ioend,
-							pg_offset, &bs, bbits);
-			if (page) {
-				nblocks += bs;
-				atomic_add(bs, &ioend->io_remaining);
-				xfs_convert_page(inode, page, iomapp, wbc, ioend,
-							startio, all_bh);
-				if (nblocks >= ((ULONG_MAX - PAGE_SIZE) >> block_bits))
-					goto enough;
-			}
-		}
+			return 1;
 	}
 
-enough:
-	ioend->io_size = (xfs_off_t)nblocks << block_bits;
-	ioend->io_offset = offset;
-	xfs_finish_ioend(ioend);
 	return 0;
 }
 
-STATIC void
-xfs_submit_page(
-	struct page		*page,
-	struct writeback_control *wbc,
-	struct buffer_head	*bh_arr[],
-	int			bh_count,
-	int			probed_page,
-	int			clear_dirty)
-{
-	struct buffer_head	*bh;
-	int			i;
-
-	BUG_ON(PageWriteback(page));
-	if (bh_count)
-		set_page_writeback(page);
-	if (clear_dirty)
-		clear_page_dirty(page);
-	unlock_page(page);
-
-	if (bh_count) {
-		for (i = 0; i < bh_count; i++) {
-			bh = bh_arr[i];
-			mark_buffer_async_write(bh);
-			if (buffer_unwritten(bh))
-				set_buffer_unwritten_io(bh);
-			set_buffer_uptodate(bh);
-			clear_buffer_dirty(bh);
-		}
-
-		for (i = 0; i < bh_count; i++)
-			submit_bh(WRITE, bh_arr[i]);
-
-		if (probed_page && clear_dirty)
-			wbc->nr_to_write--;	/* Wrote an "extra" page */
-	}
-}
-
 /*
  * Allocate & map buffers for page given the extent map. Write it out.
  * except for the original page of a writepage, this is called on
  * delalloc/unwritten pages only, for the original page it is possible
  * that the page has no mapping at all.
  */
-STATIC void
+STATIC int
 xfs_convert_page(
 	struct inode		*inode,
 	struct page		*page,
-	xfs_iomap_t		*iomapp,
+	loff_t			tindex,
+	xfs_iomap_t		*mp,
+	xfs_ioend_t		**ioendp,
 	struct writeback_control *wbc,
-	void			*private,
 	int			startio,
 	int			all_bh)
 {
-	struct buffer_head	*bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
-	xfs_iomap_t		*mp = iomapp, *tmp;
-	unsigned long		offset, end_offset;
-	int			index = 0;
+	struct buffer_head	*bh, *head;
+	xfs_off_t		end_offset;
+	unsigned long		p_offset;
+	unsigned int		type;
 	int			bbits = inode->i_blkbits;
 	int			len, page_dirty;
+	int			count = 0, done = 0, uptodate = 1;
+ 	xfs_off_t		offset = page_offset(page);
 
-	end_offset = (i_size_read(inode) & (PAGE_CACHE_SIZE - 1));
+	if (page->index != tindex)
+		goto fail;
+	if (TestSetPageLocked(page))
+		goto fail;
+	if (PageWriteback(page))
+		goto fail_unlock_page;
+	if (page->mapping != inode->i_mapping)
+		goto fail_unlock_page;
+	if (!xfs_is_delayed_page(page, (*ioendp)->io_type))
+		goto fail_unlock_page;
 
 	/*
 	 * page_dirty is initially a count of buffers on the page before
 	 * EOF and is decrememted as we move each into a cleanable state.
+	 *
+	 * Derivation:
+	 *
+	 * End offset is the highest offset that this page should represent.
+	 * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1))
+	 * will evaluate non-zero and be less than PAGE_CACHE_SIZE and
+	 * hence give us the correct page_dirty count. On any other page,
+	 * it will be zero and in that case we need page_dirty to be the
+	 * count of buffers on the page.
 	 */
+	end_offset = min_t(unsigned long long,
+			(xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT,
+			i_size_read(inode));
+
 	len = 1 << inode->i_blkbits;
-	end_offset = max(end_offset, PAGE_CACHE_SIZE);
-	end_offset = roundup(end_offset, len);
-	page_dirty = end_offset / len;
+	p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1),
+					PAGE_CACHE_SIZE);
+	p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE;
+	page_dirty = p_offset / len;
 
-	offset = 0;
 	bh = head = page_buffers(page);
 	do {
 		if (offset >= end_offset)
 			break;
-		if (!(PageUptodate(page) || buffer_uptodate(bh)))
+		if (!buffer_uptodate(bh))
+			uptodate = 0;
+		if (!(PageUptodate(page) || buffer_uptodate(bh))) {
+			done = 1;
 			continue;
-		if (buffer_mapped(bh) && all_bh &&
-		    !(buffer_unwritten(bh) || buffer_delay(bh))) {
+		}
+
+		if (buffer_unwritten(bh) || buffer_delay(bh)) {
+			if (buffer_unwritten(bh))
+				type = IOMAP_UNWRITTEN;
+			else
+				type = IOMAP_DELAY;
+
+			if (!xfs_iomap_valid(mp, offset)) {
+				done = 1;
+				continue;
+			}
+
+			ASSERT(!(mp->iomap_flags & IOMAP_HOLE));
+			ASSERT(!(mp->iomap_flags & IOMAP_DELAY));
+
+			xfs_map_at_offset(bh, offset, bbits, mp);
 			if (startio) {
+				xfs_add_to_ioend(inode, bh, offset,
+						type, ioendp, done);
+			} else {
+				set_buffer_dirty(bh);
+				unlock_buffer(bh);
+				mark_buffer_dirty(bh);
+			}
+			page_dirty--;
+			count++;
+		} else {
+			type = 0;
+			if (buffer_mapped(bh) && all_bh && startio) {
 				lock_buffer(bh);
-				bh_arr[index++] = bh;
+				xfs_add_to_ioend(inode, bh, offset,
+						type, ioendp, done);
+				count++;
 				page_dirty--;
+			} else {
+				done = 1;
 			}
-			continue;
 		}
-		tmp = xfs_offset_to_map(page, mp, offset);
-		if (!tmp)
-			continue;
-		ASSERT(!(tmp->iomap_flags & IOMAP_HOLE));
-		ASSERT(!(tmp->iomap_flags & IOMAP_DELAY));
+	} while (offset += len, (bh = bh->b_this_page) != head);
 
-		/* If this is a new unwritten extent buffer (i.e. one
-		 * that we haven't passed in private data for, we must
-		 * now map this buffer too.
-		 */
-		if (buffer_unwritten(bh) && !bh->b_end_io) {
-			ASSERT(tmp->iomap_flags & IOMAP_UNWRITTEN);
-			xfs_map_unwritten(inode, page, head, bh, offset,
-					bbits, tmp, wbc, startio, all_bh);
-		} else if (! (buffer_unwritten(bh) && buffer_locked(bh))) {
-			xfs_map_at_offset(page, bh, offset, bbits, tmp);
-			if (buffer_unwritten(bh)) {
-				set_buffer_unwritten_io(bh);
-				bh->b_private = private;
-				ASSERT(private);
+	if (uptodate && bh == head)
+		SetPageUptodate(page);
+
+	if (startio) {
+		if (count) {
+			struct backing_dev_info *bdi;
+
+			bdi = inode->i_mapping->backing_dev_info;
+			if (bdi_write_congested(bdi)) {
+				wbc->encountered_congestion = 1;
+				done = 1;
+			} else if (--wbc->nr_to_write <= 0) {
+				done = 1;
 			}
 		}
-		if (startio) {
-			bh_arr[index++] = bh;
-		} else {
-			set_buffer_dirty(bh);
-			unlock_buffer(bh);
-			mark_buffer_dirty(bh);
-		}
-		page_dirty--;
-	} while (offset += len, (bh = bh->b_this_page) != head);
-
-	if (startio && index) {
-		xfs_submit_page(page, wbc, bh_arr, index, 1, !page_dirty);
-	} else {
-		unlock_page(page);
+		xfs_start_page_writeback(page, wbc, !page_dirty, count);
 	}
+
+	return done;
+ fail_unlock_page:
+	unlock_page(page);
+ fail:
+	return 1;
 }
 
 /*
@@ -685,19 +750,31 @@ xfs_cluster_write(
 	struct inode		*inode,
 	pgoff_t			tindex,
 	xfs_iomap_t		*iomapp,
+	xfs_ioend_t		**ioendp,
 	struct writeback_control *wbc,
 	int			startio,
 	int			all_bh,
 	pgoff_t			tlast)
 {
-	struct page		*page;
+	struct pagevec		pvec;
+	int			done = 0, i;
 
-	for (; tindex <= tlast; tindex++) {
-		page = xfs_probe_delalloc_page(inode, tindex);
-		if (!page)
+	pagevec_init(&pvec, 0);
+	while (!done && tindex <= tlast) {
+		unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1);
+
+		if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len))
 			break;
-		xfs_convert_page(inode, page, iomapp, wbc, NULL,
-				startio, all_bh);
+
+		for (i = 0; i < pagevec_count(&pvec); i++) {
+			done = xfs_convert_page(inode, pvec.pages[i], tindex++,
+					iomapp, ioendp, wbc, startio, all_bh);
+			if (done)
+				break;
+		}
+
+		pagevec_release(&pvec);
+		cond_resched();
 	}
 }
 
@@ -728,18 +805,22 @@ xfs_page_state_convert(
 	int		startio,
 	int		unmapped) /* also implies page uptodate */
 {
-	struct buffer_head	*bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
-	xfs_iomap_t		*iomp, iomap;
+	struct buffer_head	*bh, *head;
+	xfs_iomap_t		iomap;
+	xfs_ioend_t		*ioend = NULL, *iohead = NULL;
 	loff_t			offset;
 	unsigned long           p_offset = 0;
+	unsigned int		type;
 	__uint64_t              end_offset;
 	pgoff_t                 end_index, last_index, tlast;
-	int			len, err, i, cnt = 0, uptodate = 1;
-	int			flags;
-	int			page_dirty;
+	ssize_t			size, len;
+	int			flags, err, iomap_valid = 0, uptodate = 1;
+	int			page_dirty, count = 0, trylock_flag = 0;
+	int			all_bh = unmapped;
 
 	/* wait for other IO threads? */
-	flags = (startio && wbc->sync_mode != WB_SYNC_NONE) ? 0 : BMAPI_TRYLOCK;
+	if (startio && (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking))
+		trylock_flag |= BMAPI_TRYLOCK;
 
 	/* Is this page beyond the end of the file? */
 	offset = i_size_read(inode);
@@ -754,161 +835,173 @@ xfs_page_state_convert(
 		}
 	}
 
-	end_offset = min_t(unsigned long long,
-			(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 before
 	 * EOF and is decrememted as we move each into a cleanable state.
-	 */
+	 *
+	 * Derivation:
+	 *
+	 * End offset is the highest offset that this page should represent.
+	 * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1))
+	 * will evaluate non-zero and be less than PAGE_CACHE_SIZE and
+	 * hence give us the correct page_dirty count. On any other page,
+	 * it will be zero and in that case we need page_dirty to be the
+	 * count of buffers on the page.
+ 	 */
+	end_offset = min_t(unsigned long long,
+			(xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset);
 	len = 1 << inode->i_blkbits;
-	p_offset = max(p_offset, PAGE_CACHE_SIZE);
-	p_offset = roundup(p_offset, len);
+	p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1),
+					PAGE_CACHE_SIZE);
+	p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE;
 	page_dirty = p_offset / len;
 
-	iomp = NULL;
-	p_offset = 0;
 	bh = head = page_buffers(page);
+	offset = page_offset(page);
+	flags = -1;
+	type = 0;
+
+	/* TODO: cleanup count and page_dirty */
 
 	do {
 		if (offset >= end_offset)
 			break;
 		if (!buffer_uptodate(bh))
 			uptodate = 0;
-		if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio)
+		if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio) {
+			/*
+			 * the iomap is actually still valid, but the ioend
+			 * isn't.  shouldn't happen too often.
+			 */
+			iomap_valid = 0;
 			continue;
-
-		if (iomp) {
-			iomp = xfs_offset_to_map(page, &iomap, p_offset);
 		}
 
+		if (iomap_valid)
+			iomap_valid = xfs_iomap_valid(&iomap, offset);
+
 		/*
 		 * First case, map an unwritten extent and prepare for
 		 * extent state conversion transaction on completion.
-		 */
-		if (buffer_unwritten(bh)) {
-			if (!startio)
-				continue;
-			if (!iomp) {
-				err = xfs_map_blocks(inode, offset, len, &iomap,
-						BMAPI_WRITE|BMAPI_IGNSTATE);
-				if (err) {
-					goto error;
-				}
-				iomp = xfs_offset_to_map(page, &iomap,
-								p_offset);
+		 *
+		 * Second case, allocate space for a delalloc buffer.
+		 * We can return EAGAIN here in the release page case.
+		 *
+		 * Third case, an unmapped buffer was found, and we are
+		 * in a path where we need to write the whole page out.
+ 		 */
+		if (buffer_unwritten(bh) || buffer_delay(bh) ||
+		    ((buffer_uptodate(bh) || PageUptodate(page)) &&
+		     !buffer_mapped(bh) && (unmapped || startio))) {
+		     	/*
+			 * Make sure we don't use a read-only iomap
+			 */
+		     	if (flags == BMAPI_READ)
+				iomap_valid = 0;
+
+			if (buffer_unwritten(bh)) {
+				type = IOMAP_UNWRITTEN;
+				flags = BMAPI_WRITE|BMAPI_IGNSTATE;
+			} else if (buffer_delay(bh)) {
+				type = IOMAP_DELAY;
+				flags = BMAPI_ALLOCATE;
+				if (!startio)
+					flags |= trylock_flag;
+			} else {
+				type = IOMAP_NEW;
+				flags = BMAPI_WRITE|BMAPI_MMAP;
 			}
-			if (iomp) {
-				if (!bh->b_end_io) {
-					err = xfs_map_unwritten(inode, page,
-							head, bh, p_offset,
-							inode->i_blkbits, iomp,
-							wbc, startio, unmapped);
-					if (err) {
-						goto error;
-					}
+
+			if (!iomap_valid) {
+				if (type == IOMAP_NEW) {
+					size = xfs_probe_cluster(inode,
+							page, bh, head, 0);
 				} else {
-					set_bit(BH_Lock, &bh->b_state);
+					size = len;
 				}
-				BUG_ON(!buffer_locked(bh));
-				bh_arr[cnt++] = bh;
-				page_dirty--;
-			}
-		/*
-		 * Second case, allocate space for a delalloc buffer.
-		 * We can return EAGAIN here in the release page case.
-		 */
-		} else if (buffer_delay(bh)) {
-			if (!iomp) {
-				err = xfs_map_blocks(inode, offset, len, &iomap,
-						BMAPI_ALLOCATE | flags);
-				if (err) {
+
+				err = xfs_map_blocks(inode, offset, size,
+						&iomap, flags);
+				if (err)
 					goto error;
-				}
-				iomp = xfs_offset_to_map(page, &iomap,
-								p_offset);
+				iomap_valid = xfs_iomap_valid(&iomap, offset);
 			}
-			if (iomp) {
-				xfs_map_at_offset(page, bh, p_offset,
-						inode->i_blkbits, iomp);
+			if (iomap_valid) {
+				xfs_map_at_offset(bh, offset,
+						inode->i_blkbits, &iomap);
 				if (startio) {
-					bh_arr[cnt++] = bh;
+					xfs_add_to_ioend(inode, bh, offset,
+							type, &ioend,
+							!iomap_valid);
 				} else {
 					set_buffer_dirty(bh);
 					unlock_buffer(bh);
 					mark_buffer_dirty(bh);
 				}
 				page_dirty--;
+				count++;
+			}
+		} else if (buffer_uptodate(bh) && startio) {
+			/*
+			 * we got here because the buffer is already mapped.
+			 * That means it must already have extents allocated
+			 * underneath it. Map the extent by reading it.
+			 */
+			if (!iomap_valid || type != 0) {
+				flags = BMAPI_READ;
+				size = xfs_probe_cluster(inode, page, bh,
+								head, 1);
+				err = xfs_map_blocks(inode, offset, size,
+						&iomap, flags);
+				if (err)
+					goto error;
+				iomap_valid = xfs_iomap_valid(&iomap, offset);
 			}
-		} else if ((buffer_uptodate(bh) || PageUptodate(page)) &&
-			   (unmapped || startio)) {
 
-			if (!buffer_mapped(bh)) {
-				int	size;
-
-				/*
-				 * Getting here implies an unmapped buffer
-				 * was found, and we are in a path where we
-				 * need to write the whole page out.
-				 */
-				if (!iomp) {
-					size = xfs_probe_unmapped_cluster(
-							inode, page, bh, head);
-					err = xfs_map_blocks(inode, offset,
-							size, &iomap,
-							BMAPI_WRITE|BMAPI_MMAP);
-					if (err) {
-						goto error;
-					}
-					iomp = xfs_offset_to_map(page, &iomap,
-								     p_offset);
-				}
-				if (iomp) {
-					xfs_map_at_offset(page,
-							bh, p_offset,
-							inode->i_blkbits, iomp);
-					if (startio) {
-						bh_arr[cnt++] = bh;
-					} else {
-						set_buffer_dirty(bh);
-						unlock_buffer(bh);
-						mark_buffer_dirty(bh);
-					}
-					page_dirty--;
-				}
-			} else if (startio) {
-				if (buffer_uptodate(bh) &&
-				    !test_and_set_bit(BH_Lock, &bh->b_state)) {
-					bh_arr[cnt++] = bh;
-					page_dirty--;
-				}
+			type = 0;
+			if (!test_and_set_bit(BH_Lock, &bh->b_state)) {
+				ASSERT(buffer_mapped(bh));
+				if (iomap_valid)
+					all_bh = 1;
+				xfs_add_to_ioend(inode, bh, offset, type,
+						&ioend, !iomap_valid);
+				page_dirty--;
+				count++;
+			} else {
+				iomap_valid = 0;
 			}
+		} else if ((buffer_uptodate(bh) || PageUptodate(page)) &&
+			   (unmapped || startio)) {
+			iomap_valid = 0;
 		}
-	} while (offset += len, p_offset += len,
-		((bh = bh->b_this_page) != head));
+
+		if (!iohead)
+			iohead = ioend;
+
+	} while (offset += len, ((bh = bh->b_this_page) != head));
 
 	if (uptodate && bh == head)
 		SetPageUptodate(page);
 
-	if (startio) {
-		xfs_submit_page(page, wbc, bh_arr, cnt, 0, !page_dirty);
-	}
+	if (startio)
+		xfs_start_page_writeback(page, wbc, 1, count);
 
-	if (iomp) {
-		offset = (iomp->iomap_offset + iomp->iomap_bsize - 1) >>
+	if (ioend && iomap_valid) {
+		offset = (iomap.iomap_offset + iomap.iomap_bsize - 1) >>
 					PAGE_CACHE_SHIFT;
 		tlast = min_t(pgoff_t, offset, last_index);
-		xfs_cluster_write(inode, page->index + 1, iomp, wbc,
-					startio, unmapped, tlast);
+		xfs_cluster_write(inode, page->index + 1, &iomap, &ioend,
+					wbc, startio, all_bh, tlast);
 	}
 
+	if (iohead)
+		xfs_submit_ioend(iohead);
+
 	return page_dirty;
 
 error:
-	for (i = 0; i < cnt; i++) {
-		unlock_buffer(bh_arr[i]);
-	}
+	if (iohead)
+		xfs_cancel_ioend(iohead);
 
 	/*
 	 * If it's delalloc and we have nowhere to put it,
@@ -916,9 +1009,8 @@ error:
 	 * us to try again.
 	 */
 	if (err != -EAGAIN) {
-		if (!unmapped) {
+		if (!unmapped)
 			block_invalidatepage(page, 0);
-		}
 		ClearPageUptodate(page);
 	}
 	return err;
@@ -982,7 +1074,7 @@ __linvfs_get_block(
 	}
 
 	/* If this is a realtime file, data might be on a new device */
-	bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
+	bh_result->b_bdev = iomap.iomap_target->bt_bdev;
 
 	/* If we previously allocated a block out beyond eof and
 	 * we are now coming back to use it then we will need to
@@ -1094,10 +1186,10 @@ linvfs_direct_IO(
 	if (error)
 		return -error;
 
-	iocb->private = xfs_alloc_ioend(inode);
+	iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN);
 
 	ret = blockdev_direct_IO_own_locking(rw, iocb, inode,
-		iomap.iomap_target->pbr_bdev,
+		iomap.iomap_target->bt_bdev,
 		iov, offset, nr_segs,
 		linvfs_get_blocks_direct,
 		linvfs_end_io_direct);
diff --git a/fs/xfs/linux-2.6/xfs_aops.h b/fs/xfs/linux-2.6/xfs_aops.h
index 4720758a9ade..55339dd5a30d 100644
--- a/fs/xfs/linux-2.6/xfs_aops.h
+++ b/fs/xfs/linux-2.6/xfs_aops.h
@@ -23,14 +23,24 @@ extern mempool_t *xfs_ioend_pool;
 
 typedef void (*xfs_ioend_func_t)(void *);
 
+/*
+ * xfs_ioend struct manages large extent writes for XFS.
+ * It can manage several multi-page bio's at once.
+ */
 typedef struct xfs_ioend {
+	struct xfs_ioend	*io_list;	/* next ioend in chain */
+	unsigned int		io_type;	/* delalloc / unwritten */
 	unsigned int		io_uptodate;	/* I/O status register */
 	atomic_t		io_remaining;	/* hold count */
 	struct vnode		*io_vnode;	/* file being written to */
 	struct buffer_head	*io_buffer_head;/* buffer linked list head */
+	struct buffer_head	*io_buffer_tail;/* buffer linked list tail */
 	size_t			io_size;	/* size of the extent */
 	xfs_off_t		io_offset;	/* offset in the file */
 	struct work_struct	io_work;	/* xfsdatad work queue */
 } xfs_ioend_t;
 
+extern struct address_space_operations linvfs_aops;
+extern int linvfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
+
 #endif /* __XFS_IOPS_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 6fe21d2b8847..e44b7c1a3a36 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -31,76 +31,77 @@
 #include <linux/kthread.h>
 #include "xfs_linux.h"
 
-STATIC kmem_cache_t *pagebuf_zone;
-STATIC kmem_shaker_t pagebuf_shake;
+STATIC kmem_zone_t *xfs_buf_zone;
+STATIC kmem_shaker_t xfs_buf_shake;
+STATIC int xfsbufd(void *);
 STATIC int xfsbufd_wakeup(int, gfp_t);
-STATIC void pagebuf_delwri_queue(xfs_buf_t *, int);
+STATIC void xfs_buf_delwri_queue(xfs_buf_t *, int);
 
 STATIC struct workqueue_struct *xfslogd_workqueue;
 struct workqueue_struct *xfsdatad_workqueue;
 
-#ifdef PAGEBUF_TRACE
+#ifdef XFS_BUF_TRACE
 void
-pagebuf_trace(
-	xfs_buf_t	*pb,
+xfs_buf_trace(
+	xfs_buf_t	*bp,
 	char		*id,
 	void		*data,
 	void		*ra)
 {
-	ktrace_enter(pagebuf_trace_buf,
-		pb, id,
-		(void *)(unsigned long)pb->pb_flags,
-		(void *)(unsigned long)pb->pb_hold.counter,
-		(void *)(unsigned long)pb->pb_sema.count.counter,
+	ktrace_enter(xfs_buf_trace_buf,
+		bp, id,
+		(void *)(unsigned long)bp->b_flags,
+		(void *)(unsigned long)bp->b_hold.counter,
+		(void *)(unsigned long)bp->b_sema.count.counter,
 		(void *)current,
 		data, ra,
-		(void *)(unsigned long)((pb->pb_file_offset>>32) & 0xffffffff),
-		(void *)(unsigned long)(pb->pb_file_offset & 0xffffffff),
-		(void *)(unsigned long)pb->pb_buffer_length,
+		(void *)(unsigned long)((bp->b_file_offset>>32) & 0xffffffff),
+		(void *)(unsigned long)(bp->b_file_offset & 0xffffffff),
+		(void *)(unsigned long)bp->b_buffer_length,
 		NULL, NULL, NULL, NULL, NULL);
 }
-ktrace_t *pagebuf_trace_buf;
-#define PAGEBUF_TRACE_SIZE	4096
-#define PB_TRACE(pb, id, data)	\
-	pagebuf_trace(pb, id, (void *)data, (void *)__builtin_return_address(0))
+ktrace_t *xfs_buf_trace_buf;
+#define XFS_BUF_TRACE_SIZE	4096
+#define XB_TRACE(bp, id, data)	\
+	xfs_buf_trace(bp, id, (void *)data, (void *)__builtin_return_address(0))
 #else
-#define PB_TRACE(pb, id, data)	do { } while (0)
+#define XB_TRACE(bp, id, data)	do { } while (0)
 #endif
 
-#ifdef PAGEBUF_LOCK_TRACKING
-# define PB_SET_OWNER(pb)	((pb)->pb_last_holder = current->pid)
-# define PB_CLEAR_OWNER(pb)	((pb)->pb_last_holder = -1)
-# define PB_GET_OWNER(pb)	((pb)->pb_last_holder)
+#ifdef XFS_BUF_LOCK_TRACKING
+# define XB_SET_OWNER(bp)	((bp)->b_last_holder = current->pid)
+# define XB_CLEAR_OWNER(bp)	((bp)->b_last_holder = -1)
+# define XB_GET_OWNER(bp)	((bp)->b_last_holder)
 #else
-# define PB_SET_OWNER(pb)	do { } while (0)
-# define PB_CLEAR_OWNER(pb)	do { } while (0)
-# define PB_GET_OWNER(pb)	do { } while (0)
+# define XB_SET_OWNER(bp)	do { } while (0)
+# define XB_CLEAR_OWNER(bp)	do { } while (0)
+# define XB_GET_OWNER(bp)	do { } while (0)
 #endif
 
-#define pb_to_gfp(flags) \
-	((((flags) & PBF_READ_AHEAD) ? __GFP_NORETRY : \
-	  ((flags) & PBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN)
+#define xb_to_gfp(flags) \
+	((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : \
+	  ((flags) & XBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN)
 
-#define pb_to_km(flags) \
-	 (((flags) & PBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP)
+#define xb_to_km(flags) \
+	 (((flags) & XBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP)
 
-#define pagebuf_allocate(flags) \
-	kmem_zone_alloc(pagebuf_zone, pb_to_km(flags))
-#define pagebuf_deallocate(pb) \
-	kmem_zone_free(pagebuf_zone, (pb));
+#define xfs_buf_allocate(flags) \
+	kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags))
+#define xfs_buf_deallocate(bp) \
+	kmem_zone_free(xfs_buf_zone, (bp));
 
 /*
- * Page Region interfaces.
+ *	Page Region interfaces.
  *
- * For pages in filesystems where the blocksize is smaller than the
- * pagesize, we use the page->private field (long) to hold a bitmap
- * of uptodate regions within the page.
+ *	For pages in filesystems where the blocksize is smaller than the
+ *	pagesize, we use the page->private field (long) to hold a bitmap
+ * 	of uptodate regions within the page.
  *
- * Each such region is "bytes per page / bits per long" bytes long.
+ *	Each such region is "bytes per page / bits per long" bytes long.
  *
- * NBPPR == number-of-bytes-per-page-region
- * BTOPR == bytes-to-page-region (rounded up)
- * BTOPRT == bytes-to-page-region-truncated (rounded down)
+ *	NBPPR == number-of-bytes-per-page-region
+ *	BTOPR == bytes-to-page-region (rounded up)
+ *	BTOPRT == bytes-to-page-region-truncated (rounded down)
  */
 #if (BITS_PER_LONG == 32)
 #define PRSHIFT		(PAGE_CACHE_SHIFT - 5)	/* (32 == 1<<5) */
@@ -159,7 +160,7 @@ test_page_region(
 }
 
 /*
- * Mapping of multi-page buffers into contiguous virtual space
+ *	Mapping of multi-page buffers into contiguous virtual space
  */
 
 typedef struct a_list {
@@ -172,7 +173,7 @@ STATIC int		as_list_len;
 STATIC DEFINE_SPINLOCK(as_lock);
 
 /*
- * Try to batch vunmaps because they are costly.
+ *	Try to batch vunmaps because they are costly.
  */
 STATIC void
 free_address(
@@ -215,83 +216,83 @@ purge_addresses(void)
 }
 
 /*
- *	Internal pagebuf object manipulation
+ *	Internal xfs_buf_t object manipulation
  */
 
 STATIC void
-_pagebuf_initialize(
-	xfs_buf_t		*pb,
+_xfs_buf_initialize(
+	xfs_buf_t		*bp,
 	xfs_buftarg_t		*target,
-	loff_t			range_base,
+	xfs_off_t		range_base,
 	size_t			range_length,
-	page_buf_flags_t	flags)
+	xfs_buf_flags_t		flags)
 {
 	/*
-	 * We don't want certain flags to appear in pb->pb_flags.
+	 * We don't want certain flags to appear in b_flags.
 	 */
-	flags &= ~(PBF_LOCK|PBF_MAPPED|PBF_DONT_BLOCK|PBF_READ_AHEAD);
-
-	memset(pb, 0, sizeof(xfs_buf_t));
-	atomic_set(&pb->pb_hold, 1);
-	init_MUTEX_LOCKED(&pb->pb_iodonesema);
-	INIT_LIST_HEAD(&pb->pb_list);
-	INIT_LIST_HEAD(&pb->pb_hash_list);
-	init_MUTEX_LOCKED(&pb->pb_sema); /* held, no waiters */
-	PB_SET_OWNER(pb);
-	pb->pb_target = target;
-	pb->pb_file_offset = range_base;
+	flags &= ~(XBF_LOCK|XBF_MAPPED|XBF_DONT_BLOCK|XBF_READ_AHEAD);
+
+	memset(bp, 0, sizeof(xfs_buf_t));
+	atomic_set(&bp->b_hold, 1);
+	init_MUTEX_LOCKED(&bp->b_iodonesema);
+	INIT_LIST_HEAD(&bp->b_list);
+	INIT_LIST_HEAD(&bp->b_hash_list);
+	init_MUTEX_LOCKED(&bp->b_sema); /* held, no waiters */
+	XB_SET_OWNER(bp);
+	bp->b_target = target;
+	bp->b_file_offset = range_base;
 	/*
 	 * Set buffer_length and count_desired to the same value initially.
 	 * I/O routines should use count_desired, which will be the same in
 	 * most cases but may be reset (e.g. XFS recovery).
 	 */
-	pb->pb_buffer_length = pb->pb_count_desired = range_length;
-	pb->pb_flags = flags;
-	pb->pb_bn = XFS_BUF_DADDR_NULL;
-	atomic_set(&pb->pb_pin_count, 0);
-	init_waitqueue_head(&pb->pb_waiters);
-
-	XFS_STATS_INC(pb_create);
-	PB_TRACE(pb, "initialize", target);
+	bp->b_buffer_length = bp->b_count_desired = range_length;
+	bp->b_flags = flags;
+	bp->b_bn = XFS_BUF_DADDR_NULL;
+	atomic_set(&bp->b_pin_count, 0);
+	init_waitqueue_head(&bp->b_waiters);
+
+	XFS_STATS_INC(xb_create);
+	XB_TRACE(bp, "initialize", target);
 }
 
 /*
- * Allocate a page array capable of holding a specified number
- * of pages, and point the page buf at it.
+ *	Allocate a page array capable of holding a specified number
+ *	of pages, and point the page buf at it.
  */
 STATIC int
-_pagebuf_get_pages(
-	xfs_buf_t		*pb,
+_xfs_buf_get_pages(
+	xfs_buf_t		*bp,
 	int			page_count,
-	page_buf_flags_t	flags)
+	xfs_buf_flags_t		flags)
 {
 	/* Make sure that we have a page list */
-	if (pb->pb_pages == NULL) {
-		pb->pb_offset = page_buf_poff(pb->pb_file_offset);
-		pb->pb_page_count = page_count;
-		if (page_count <= PB_PAGES) {
-			pb->pb_pages = pb->pb_page_array;
+	if (bp->b_pages == NULL) {
+		bp->b_offset = xfs_buf_poff(bp->b_file_offset);
+		bp->b_page_count = page_count;
+		if (page_count <= XB_PAGES) {
+			bp->b_pages = bp->b_page_array;
 		} else {
-			pb->pb_pages = kmem_alloc(sizeof(struct page *) *
-					page_count, pb_to_km(flags));
-			if (pb->pb_pages == NULL)
+			bp->b_pages = kmem_alloc(sizeof(struct page *) *
+					page_count, xb_to_km(flags));
+			if (bp->b_pages == NULL)
 				return -ENOMEM;
 		}
-		memset(pb->pb_pages, 0, sizeof(struct page *) * page_count);
+		memset(bp->b_pages, 0, sizeof(struct page *) * page_count);
 	}
 	return 0;
 }
 
 /*
- *	Frees pb_pages if it was malloced.
+ *	Frees b_pages if it was allocated.
  */
 STATIC void
-_pagebuf_free_pages(
+_xfs_buf_free_pages(
 	xfs_buf_t	*bp)
 {
-	if (bp->pb_pages != bp->pb_page_array) {
-		kmem_free(bp->pb_pages,
-			  bp->pb_page_count * sizeof(struct page *));
+	if (bp->b_pages != bp->b_page_array) {
+		kmem_free(bp->b_pages,
+			  bp->b_page_count * sizeof(struct page *));
 	}
 }
 
@@ -299,79 +300,79 @@ _pagebuf_free_pages(
  *	Releases the specified buffer.
  *
  * 	The modification state of any associated pages is left unchanged.
- * 	The buffer most not be on any hash - use pagebuf_rele instead for
+ * 	The buffer most not be on any hash - use xfs_buf_rele instead for
  * 	hashed and refcounted buffers
  */
 void
-pagebuf_free(
+xfs_buf_free(
 	xfs_buf_t		*bp)
 {
-	PB_TRACE(bp, "free", 0);
+	XB_TRACE(bp, "free", 0);
 
-	ASSERT(list_empty(&bp->pb_hash_list));
+	ASSERT(list_empty(&bp->b_hash_list));
 
-	if (bp->pb_flags & _PBF_PAGE_CACHE) {
+	if (bp->b_flags & _XBF_PAGE_CACHE) {
 		uint		i;
 
-		if ((bp->pb_flags & PBF_MAPPED) && (bp->pb_page_count > 1))
-			free_address(bp->pb_addr - bp->pb_offset);
+		if ((bp->b_flags & XBF_MAPPED) && (bp->b_page_count > 1))
+			free_address(bp->b_addr - bp->b_offset);
 
-		for (i = 0; i < bp->pb_page_count; i++)
-			page_cache_release(bp->pb_pages[i]);
-		_pagebuf_free_pages(bp);
-	} else if (bp->pb_flags & _PBF_KMEM_ALLOC) {
+		for (i = 0; i < bp->b_page_count; i++)
+			page_cache_release(bp->b_pages[i]);
+		_xfs_buf_free_pages(bp);
+	} else if (bp->b_flags & _XBF_KMEM_ALLOC) {
 		 /*
-		  * XXX(hch): bp->pb_count_desired might be incorrect (see
-		  * pagebuf_associate_memory for details), but fortunately
+		  * XXX(hch): bp->b_count_desired might be incorrect (see
+		  * xfs_buf_associate_memory for details), but fortunately
 		  * the Linux version of kmem_free ignores the len argument..
 		  */
-		kmem_free(bp->pb_addr, bp->pb_count_desired);
-		_pagebuf_free_pages(bp);
+		kmem_free(bp->b_addr, bp->b_count_desired);
+		_xfs_buf_free_pages(bp);
 	}
 
-	pagebuf_deallocate(bp);
+	xfs_buf_deallocate(bp);
 }
 
 /*
  *	Finds all pages for buffer in question and builds it's page list.
  */
 STATIC int
-_pagebuf_lookup_pages(
+_xfs_buf_lookup_pages(
 	xfs_buf_t		*bp,
 	uint			flags)
 {
-	struct address_space	*mapping = bp->pb_target->pbr_mapping;
-	size_t			blocksize = bp->pb_target->pbr_bsize;
-	size_t			size = bp->pb_count_desired;
+	struct address_space	*mapping = bp->b_target->bt_mapping;
+	size_t			blocksize = bp->b_target->bt_bsize;
+	size_t			size = bp->b_count_desired;
 	size_t			nbytes, offset;
-	gfp_t			gfp_mask = pb_to_gfp(flags);
+	gfp_t			gfp_mask = xb_to_gfp(flags);
 	unsigned short		page_count, i;
 	pgoff_t			first;
-	loff_t			end;
+	xfs_off_t		end;
 	int			error;
 
-	end = bp->pb_file_offset + bp->pb_buffer_length;
-	page_count = page_buf_btoc(end) - page_buf_btoct(bp->pb_file_offset);
+	end = bp->b_file_offset + bp->b_buffer_length;
+	page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset);
 
-	error = _pagebuf_get_pages(bp, page_count, flags);
+	error = _xfs_buf_get_pages(bp, page_count, flags);
 	if (unlikely(error))
 		return error;
-	bp->pb_flags |= _PBF_PAGE_CACHE;
+	bp->b_flags |= _XBF_PAGE_CACHE;
 
-	offset = bp->pb_offset;
-	first = bp->pb_file_offset >> PAGE_CACHE_SHIFT;
+	offset = bp->b_offset;
+	first = bp->b_file_offset >> PAGE_CACHE_SHIFT;
 
-	for (i = 0; i < bp->pb_page_count; i++) {
+	for (i = 0; i < bp->b_page_count; i++) {
 		struct page	*page;
 		uint		retries = 0;
 
 	      retry:
 		page = find_or_create_page(mapping, first + i, gfp_mask);
 		if (unlikely(page == NULL)) {
-			if (flags & PBF_READ_AHEAD) {
-				bp->pb_page_count = i;
-				for (i = 0; i < bp->pb_page_count; i++)
-					unlock_page(bp->pb_pages[i]);
+			if (flags & XBF_READ_AHEAD) {
+				bp->b_page_count = i;
+				for (i = 0; i < bp->b_page_count; i++)
+					unlock_page(bp->b_pages[i]);
 				return -ENOMEM;
 			}
 
@@ -387,13 +388,13 @@ _pagebuf_lookup_pages(
 					"deadlock in %s (mode:0x%x)\n",
 					__FUNCTION__, gfp_mask);
 
-			XFS_STATS_INC(pb_page_retries);
+			XFS_STATS_INC(xb_page_retries);
 			xfsbufd_wakeup(0, gfp_mask);
 			blk_congestion_wait(WRITE, HZ/50);
 			goto retry;
 		}
 
-		XFS_STATS_INC(pb_page_found);
+		XFS_STATS_INC(xb_page_found);
 
 		nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset);
 		size -= nbytes;
@@ -401,27 +402,27 @@ _pagebuf_lookup_pages(
 		if (!PageUptodate(page)) {
 			page_count--;
 			if (blocksize >= PAGE_CACHE_SIZE) {
-				if (flags & PBF_READ)
-					bp->pb_locked = 1;
+				if (flags & XBF_READ)
+					bp->b_locked = 1;
 			} else if (!PagePrivate(page)) {
 				if (test_page_region(page, offset, nbytes))
 					page_count++;
 			}
 		}
 
-		bp->pb_pages[i] = page;
+		bp->b_pages[i] = page;
 		offset = 0;
 	}
 
-	if (!bp->pb_locked) {
-		for (i = 0; i < bp->pb_page_count; i++)
-			unlock_page(bp->pb_pages[i]);
+	if (!bp->b_locked) {
+		for (i = 0; i < bp->b_page_count; i++)
+			unlock_page(bp->b_pages[i]);
 	}
 
-	if (page_count == bp->pb_page_count)
-		bp->pb_flags |= PBF_DONE;
+	if (page_count == bp->b_page_count)
+		bp->b_flags |= XBF_DONE;
 
-	PB_TRACE(bp, "lookup_pages", (long)page_count);
+	XB_TRACE(bp, "lookup_pages", (long)page_count);
 	return error;
 }
 
@@ -429,23 +430,23 @@ _pagebuf_lookup_pages(
  *	Map buffer into kernel address-space if nessecary.
  */
 STATIC int
-_pagebuf_map_pages(
+_xfs_buf_map_pages(
 	xfs_buf_t		*bp,
 	uint			flags)
 {
 	/* A single page buffer is always mappable */
-	if (bp->pb_page_count == 1) {
-		bp->pb_addr = page_address(bp->pb_pages[0]) + bp->pb_offset;
-		bp->pb_flags |= PBF_MAPPED;
-	} else if (flags & PBF_MAPPED) {
+	if (bp->b_page_count == 1) {
+		bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
+		bp->b_flags |= XBF_MAPPED;
+	} else if (flags & XBF_MAPPED) {
 		if (as_list_len > 64)
 			purge_addresses();
-		bp->pb_addr = vmap(bp->pb_pages, bp->pb_page_count,
-				VM_MAP, PAGE_KERNEL);
-		if (unlikely(bp->pb_addr == NULL))
+		bp->b_addr = vmap(bp->b_pages, bp->b_page_count,
+					VM_MAP, PAGE_KERNEL);
+		if (unlikely(bp->b_addr == NULL))
 			return -ENOMEM;
-		bp->pb_addr += bp->pb_offset;
-		bp->pb_flags |= PBF_MAPPED;
+		bp->b_addr += bp->b_offset;
+		bp->b_flags |= XBF_MAPPED;
 	}
 
 	return 0;
@@ -456,9 +457,7 @@ _pagebuf_map_pages(
  */
 
 /*
- *	_pagebuf_find
- *
- *	Looks up, and creates if absent, a lockable buffer for
+ *	Look up, and creates if absent, a lockable buffer for
  *	a given range of an inode.  The buffer is returned
  *	locked.	 If other overlapping buffers exist, they are
  *	released before the new buffer is created and locked,
@@ -466,55 +465,55 @@ _pagebuf_map_pages(
  *	are unlocked.  No I/O is implied by this call.
  */
 xfs_buf_t *
-_pagebuf_find(
+_xfs_buf_find(
 	xfs_buftarg_t		*btp,	/* block device target		*/
-	loff_t			ioff,	/* starting offset of range	*/
+	xfs_off_t		ioff,	/* starting offset of range	*/
 	size_t			isize,	/* length of range		*/
-	page_buf_flags_t	flags,	/* PBF_TRYLOCK			*/
-	xfs_buf_t		*new_pb)/* newly allocated buffer	*/
+	xfs_buf_flags_t		flags,
+	xfs_buf_t		*new_bp)
 {
-	loff_t			range_base;
+	xfs_off_t		range_base;
 	size_t			range_length;
 	xfs_bufhash_t		*hash;
-	xfs_buf_t		*pb, *n;
+	xfs_buf_t		*bp, *n;
 
 	range_base = (ioff << BBSHIFT);
 	range_length = (isize << BBSHIFT);
 
 	/* Check for IOs smaller than the sector size / not sector aligned */
-	ASSERT(!(range_length < (1 << btp->pbr_sshift)));
-	ASSERT(!(range_base & (loff_t)btp->pbr_smask));
+	ASSERT(!(range_length < (1 << btp->bt_sshift)));
+	ASSERT(!(range_base & (xfs_off_t)btp->bt_smask));
 
 	hash = &btp->bt_hash[hash_long((unsigned long)ioff, btp->bt_hashshift)];
 
 	spin_lock(&hash->bh_lock);
 
-	list_for_each_entry_safe(pb, n, &hash->bh_list, pb_hash_list) {
-		ASSERT(btp == pb->pb_target);
-		if (pb->pb_file_offset == range_base &&
-		    pb->pb_buffer_length == range_length) {
+	list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) {
+		ASSERT(btp == bp->b_target);
+		if (bp->b_file_offset == range_base &&
+		    bp->b_buffer_length == range_length) {
 			/*
-			 * If we look at something bring it to the
+			 * If we look at something, bring it to the
 			 * front of the list for next time.
 			 */
-			atomic_inc(&pb->pb_hold);
-			list_move(&pb->pb_hash_list, &hash->bh_list);
+			atomic_inc(&bp->b_hold);
+			list_move(&bp->b_hash_list, &hash->bh_list);
 			goto found;
 		}
 	}
 
 	/* No match found */
-	if (new_pb) {
-		_pagebuf_initialize(new_pb, btp, range_base,
+	if (new_bp) {
+		_xfs_buf_initialize(new_bp, btp, range_base,
 				range_length, flags);
-		new_pb->pb_hash = hash;
-		list_add(&new_pb->pb_hash_list, &hash->bh_list);
+		new_bp->b_hash = hash;
+		list_add(&new_bp->b_hash_list, &hash->bh_list);
 	} else {
-		XFS_STATS_INC(pb_miss_locked);
+		XFS_STATS_INC(xb_miss_locked);
 	}
 
 	spin_unlock(&hash->bh_lock);
-	return new_pb;
+	return new_bp;
 
 found:
 	spin_unlock(&hash->bh_lock);
@@ -523,74 +522,72 @@ found:
 	 * if this does not work then we need to drop the
 	 * spinlock and do a hard attempt on the semaphore.
 	 */
-	if (down_trylock(&pb->pb_sema)) {
-		if (!(flags & PBF_TRYLOCK)) {
+	if (down_trylock(&bp->b_sema)) {
+		if (!(flags & XBF_TRYLOCK)) {
 			/* wait for buffer ownership */
-			PB_TRACE(pb, "get_lock", 0);
-			pagebuf_lock(pb);
-			XFS_STATS_INC(pb_get_locked_waited);
+			XB_TRACE(bp, "get_lock", 0);
+			xfs_buf_lock(bp);
+			XFS_STATS_INC(xb_get_locked_waited);
 		} else {
 			/* We asked for a trylock and failed, no need
 			 * to look at file offset and length here, we
-			 * know that this pagebuf at least overlaps our
-			 * pagebuf and is locked, therefore our buffer
-			 * either does not exist, or is this buffer
+			 * know that this buffer at least overlaps our
+			 * buffer and is locked, therefore our buffer
+			 * either does not exist, or is this buffer.
 			 */
-
-			pagebuf_rele(pb);
-			XFS_STATS_INC(pb_busy_locked);
-			return (NULL);
+			xfs_buf_rele(bp);
+			XFS_STATS_INC(xb_busy_locked);
+			return NULL;
 		}
 	} else {
 		/* trylock worked */
-		PB_SET_OWNER(pb);
+		XB_SET_OWNER(bp);
 	}
 
-	if (pb->pb_flags & PBF_STALE) {
-		ASSERT((pb->pb_flags & _PBF_DELWRI_Q) == 0);
-		pb->pb_flags &= PBF_MAPPED;
+	if (bp->b_flags & XBF_STALE) {
+		ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
+		bp->b_flags &= XBF_MAPPED;
 	}
-	PB_TRACE(pb, "got_lock", 0);
-	XFS_STATS_INC(pb_get_locked);
-	return (pb);
+	XB_TRACE(bp, "got_lock", 0);
+	XFS_STATS_INC(xb_get_locked);
+	return bp;
 }
 
 /*
- *	xfs_buf_get_flags assembles a buffer covering the specified range.
- *
+ *	Assembles a buffer covering the specified range.
  *	Storage in memory for all portions of the buffer will be allocated,
  *	although backing storage may not be.
  */
 xfs_buf_t *
-xfs_buf_get_flags(			/* allocate a buffer		*/
+xfs_buf_get_flags(
 	xfs_buftarg_t		*target,/* target for buffer		*/
-	loff_t			ioff,	/* starting offset of range	*/
+	xfs_off_t		ioff,	/* starting offset of range	*/
 	size_t			isize,	/* length of range		*/
-	page_buf_flags_t	flags)	/* PBF_TRYLOCK			*/
+	xfs_buf_flags_t		flags)
 {
-	xfs_buf_t		*pb, *new_pb;
+	xfs_buf_t		*bp, *new_bp;
 	int			error = 0, i;
 
-	new_pb = pagebuf_allocate(flags);
-	if (unlikely(!new_pb))
+	new_bp = xfs_buf_allocate(flags);
+	if (unlikely(!new_bp))
 		return NULL;
 
-	pb = _pagebuf_find(target, ioff, isize, flags, new_pb);
-	if (pb == new_pb) {
-		error = _pagebuf_lookup_pages(pb, flags);
+	bp = _xfs_buf_find(target, ioff, isize, flags, new_bp);
+	if (bp == new_bp) {
+		error = _xfs_buf_lookup_pages(bp, flags);
 		if (error)
 			goto no_buffer;
 	} else {
-		pagebuf_deallocate(new_pb);
-		if (unlikely(pb == NULL))
+		xfs_buf_deallocate(new_bp);
+		if (unlikely(bp == NULL))
 			return NULL;
 	}
 
-	for (i = 0; i < pb->pb_page_count; i++)
-		mark_page_accessed(pb->pb_pages[i]);
+	for (i = 0; i < bp->b_page_count; i++)
+		mark_page_accessed(bp->b_pages[i]);
 
-	if (!(pb->pb_flags & PBF_MAPPED)) {
-		error = _pagebuf_map_pages(pb, flags);
+	if (!(bp->b_flags & XBF_MAPPED)) {
+		error = _xfs_buf_map_pages(bp, flags);
 		if (unlikely(error)) {
 			printk(KERN_WARNING "%s: failed to map pages\n",
 					__FUNCTION__);
@@ -598,97 +595,97 @@ xfs_buf_get_flags(			/* allocate a buffer		*/
 		}
 	}
 
-	XFS_STATS_INC(pb_get);
+	XFS_STATS_INC(xb_get);
 
 	/*
 	 * Always fill in the block number now, the mapped cases can do
 	 * their own overlay of this later.
 	 */
-	pb->pb_bn = ioff;
-	pb->pb_count_desired = pb->pb_buffer_length;
+	bp->b_bn = ioff;
+	bp->b_count_desired = bp->b_buffer_length;
 
-	PB_TRACE(pb, "get", (unsigned long)flags);
-	return pb;
+	XB_TRACE(bp, "get", (unsigned long)flags);
+	return bp;
 
  no_buffer:
-	if (flags & (PBF_LOCK | PBF_TRYLOCK))
-		pagebuf_unlock(pb);
-	pagebuf_rele(pb);
+	if (flags & (XBF_LOCK | XBF_TRYLOCK))
+		xfs_buf_unlock(bp);
+	xfs_buf_rele(bp);
 	return NULL;
 }
 
 xfs_buf_t *
 xfs_buf_read_flags(
 	xfs_buftarg_t		*target,
-	loff_t			ioff,
+	xfs_off_t		ioff,
 	size_t			isize,
-	page_buf_flags_t	flags)
+	xfs_buf_flags_t		flags)
 {
-	xfs_buf_t		*pb;
-
-	flags |= PBF_READ;
-
-	pb = xfs_buf_get_flags(target, ioff, isize, flags);
-	if (pb) {
-		if (!XFS_BUF_ISDONE(pb)) {
-			PB_TRACE(pb, "read", (unsigned long)flags);
-			XFS_STATS_INC(pb_get_read);
-			pagebuf_iostart(pb, flags);
-		} else if (flags & PBF_ASYNC) {
-			PB_TRACE(pb, "read_async", (unsigned long)flags);
+	xfs_buf_t		*bp;
+
+	flags |= XBF_READ;
+
+	bp = xfs_buf_get_flags(target, ioff, isize, flags);
+	if (bp) {
+		if (!XFS_BUF_ISDONE(bp)) {
+			XB_TRACE(bp, "read", (unsigned long)flags);
+			XFS_STATS_INC(xb_get_read);
+			xfs_buf_iostart(bp, flags);
+		} else if (flags & XBF_ASYNC) {
+			XB_TRACE(bp, "read_async", (unsigned long)flags);
 			/*
 			 * Read ahead call which is already satisfied,
 			 * drop the buffer
 			 */
 			goto no_buffer;
 		} else {
-			PB_TRACE(pb, "read_done", (unsigned long)flags);
+			XB_TRACE(bp, "read_done", (unsigned long)flags);
 			/* We do not want read in the flags */
-			pb->pb_flags &= ~PBF_READ;
+			bp->b_flags &= ~XBF_READ;
 		}
 	}
 
-	return pb;
+	return bp;
 
  no_buffer:
-	if (flags & (PBF_LOCK | PBF_TRYLOCK))
-		pagebuf_unlock(pb);
-	pagebuf_rele(pb);
+	if (flags & (XBF_LOCK | XBF_TRYLOCK))
+		xfs_buf_unlock(bp);
+	xfs_buf_rele(bp);
 	return NULL;
 }
 
 /*
- * If we are not low on memory then do the readahead in a deadlock
- * safe manner.
+ *	If we are not low on memory then do the readahead in a deadlock
+ *	safe manner.
  */
 void
-pagebuf_readahead(
+xfs_buf_readahead(
 	xfs_buftarg_t		*target,
-	loff_t			ioff,
+	xfs_off_t		ioff,
 	size_t			isize,
-	page_buf_flags_t	flags)
+	xfs_buf_flags_t		flags)
 {
 	struct backing_dev_info *bdi;
 
-	bdi = target->pbr_mapping->backing_dev_info;
+	bdi = target->bt_mapping->backing_dev_info;
 	if (bdi_read_congested(bdi))
 		return;
 
-	flags |= (PBF_TRYLOCK|PBF_ASYNC|PBF_READ_AHEAD);
+	flags |= (XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD);
 	xfs_buf_read_flags(target, ioff, isize, flags);
 }
 
 xfs_buf_t *
-pagebuf_get_empty(
+xfs_buf_get_empty(
 	size_t			len,
 	xfs_buftarg_t		*target)
 {
-	xfs_buf_t		*pb;
+	xfs_buf_t		*bp;
 
-	pb = pagebuf_allocate(0);
-	if (pb)
-		_pagebuf_initialize(pb, target, 0, len, 0);
-	return pb;
+	bp = xfs_buf_allocate(0);
+	if (bp)
+		_xfs_buf_initialize(bp, target, 0, len, 0);
+	return bp;
 }
 
 static inline struct page *
@@ -704,8 +701,8 @@ mem_to_page(
 }
 
 int
-pagebuf_associate_memory(
-	xfs_buf_t		*pb,
+xfs_buf_associate_memory(
+	xfs_buf_t		*bp,
 	void			*mem,
 	size_t			len)
 {
@@ -722,40 +719,40 @@ pagebuf_associate_memory(
 		page_count++;
 
 	/* Free any previous set of page pointers */
-	if (pb->pb_pages)
-		_pagebuf_free_pages(pb);
+	if (bp->b_pages)
+		_xfs_buf_free_pages(bp);
 
-	pb->pb_pages = NULL;
-	pb->pb_addr = mem;
+	bp->b_pages = NULL;
+	bp->b_addr = mem;
 
-	rval = _pagebuf_get_pages(pb, page_count, 0);
+	rval = _xfs_buf_get_pages(bp, page_count, 0);
 	if (rval)
 		return rval;
 
-	pb->pb_offset = offset;
+	bp->b_offset = offset;
 	ptr = (size_t) mem & PAGE_CACHE_MASK;
 	end = PAGE_CACHE_ALIGN((size_t) mem + len);
 	end_cur = end;
 	/* set up first page */
-	pb->pb_pages[0] = mem_to_page(mem);
+	bp->b_pages[0] = mem_to_page(mem);
 
 	ptr += PAGE_CACHE_SIZE;
-	pb->pb_page_count = ++i;
+	bp->b_page_count = ++i;
 	while (ptr < end) {
-		pb->pb_pages[i] = mem_to_page((void *)ptr);
-		pb->pb_page_count = ++i;
+		bp->b_pages[i] = mem_to_page((void *)ptr);
+		bp->b_page_count = ++i;
 		ptr += PAGE_CACHE_SIZE;
 	}
-	pb->pb_locked = 0;
+	bp->b_locked = 0;
 
-	pb->pb_count_desired = pb->pb_buffer_length = len;
-	pb->pb_flags |= PBF_MAPPED;
+	bp->b_count_desired = bp->b_buffer_length = len;
+	bp->b_flags |= XBF_MAPPED;
 
 	return 0;
 }
 
 xfs_buf_t *
-pagebuf_get_no_daddr(
+xfs_buf_get_noaddr(
 	size_t			len,
 	xfs_buftarg_t		*target)
 {
@@ -764,10 +761,10 @@ pagebuf_get_no_daddr(
 	void			*data;
 	int			error;
 
-	bp = pagebuf_allocate(0);
+	bp = xfs_buf_allocate(0);
 	if (unlikely(bp == NULL))
 		goto fail;
-	_pagebuf_initialize(bp, target, 0, len, 0);
+	_xfs_buf_initialize(bp, target, 0, len, 0);
 
  try_again:
 	data = kmem_alloc(malloc_len, KM_SLEEP | KM_MAYFAIL);
@@ -776,78 +773,73 @@ pagebuf_get_no_daddr(
 
 	/* check whether alignment matches.. */
 	if ((__psunsigned_t)data !=
-	    ((__psunsigned_t)data & ~target->pbr_smask)) {
+	    ((__psunsigned_t)data & ~target->bt_smask)) {
 		/* .. else double the size and try again */
 		kmem_free(data, malloc_len);
 		malloc_len <<= 1;
 		goto try_again;
 	}
 
-	error = pagebuf_associate_memory(bp, data, len);
+	error = xfs_buf_associate_memory(bp, data, len);
 	if (error)
 		goto fail_free_mem;
-	bp->pb_flags |= _PBF_KMEM_ALLOC;
+	bp->b_flags |= _XBF_KMEM_ALLOC;
 
-	pagebuf_unlock(bp);
+	xfs_buf_unlock(bp);
 
-	PB_TRACE(bp, "no_daddr", data);
+	XB_TRACE(bp, "no_daddr", data);
 	return bp;
  fail_free_mem:
 	kmem_free(data, malloc_len);
  fail_free_buf:
-	pagebuf_free(bp);
+	xfs_buf_free(bp);
  fail:
 	return NULL;
 }
 
 /*
- *	pagebuf_hold
- *
  *	Increment reference count on buffer, to hold the buffer concurrently
  *	with another thread which may release (free) the buffer asynchronously.
- *
  *	Must hold the buffer already to call this function.
  */
 void
-pagebuf_hold(
-	xfs_buf_t		*pb)
+xfs_buf_hold(
+	xfs_buf_t		*bp)
 {
-	atomic_inc(&pb->pb_hold);
-	PB_TRACE(pb, "hold", 0);
+	atomic_inc(&bp->b_hold);
+	XB_TRACE(bp, "hold", 0);
 }
 
 /*
- *	pagebuf_rele
- *
- *	pagebuf_rele releases a hold on the specified buffer.  If the
- *	the hold count is 1, pagebuf_rele calls pagebuf_free.
+ *	Releases a hold on the specified buffer.  If the
+ *	the hold count is 1, calls xfs_buf_free.
  */
 void
-pagebuf_rele(
-	xfs_buf_t		*pb)
+xfs_buf_rele(
+	xfs_buf_t		*bp)
 {
-	xfs_bufhash_t		*hash = pb->pb_hash;
+	xfs_bufhash_t		*hash = bp->b_hash;
 
-	PB_TRACE(pb, "rele", pb->pb_relse);
+	XB_TRACE(bp, "rele", bp->b_relse);
 
-	if (atomic_dec_and_lock(&pb->pb_hold, &hash->bh_lock)) {
-		if (pb->pb_relse) {
-			atomic_inc(&pb->pb_hold);
+	if (atomic_dec_and_lock(&bp->b_hold, &hash->bh_lock)) {
+		if (bp->b_relse) {
+			atomic_inc(&bp->b_hold);
 			spin_unlock(&hash->bh_lock);
-			(*(pb->pb_relse)) (pb);
-		} else if (pb->pb_flags & PBF_FS_MANAGED) {
+			(*(bp->b_relse)) (bp);
+		} else if (bp->b_flags & XBF_FS_MANAGED) {
 			spin_unlock(&hash->bh_lock);
 		} else {
-			ASSERT(!(pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q)));
-			list_del_init(&pb->pb_hash_list);
+			ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)));
+			list_del_init(&bp->b_hash_list);
 			spin_unlock(&hash->bh_lock);
-			pagebuf_free(pb);
+			xfs_buf_free(bp);
 		}
 	} else {
 		/*
 		 * Catch reference count leaks
 		 */
-		ASSERT(atomic_read(&pb->pb_hold) >= 0);
+		ASSERT(atomic_read(&bp->b_hold) >= 0);
 	}
 }
 
@@ -863,168 +855,122 @@ pagebuf_rele(
  */
 
 /*
- *	pagebuf_cond_lock
- *
- *	pagebuf_cond_lock locks a buffer object, if it is not already locked.
- *	Note that this in no way
- *	locks the underlying pages, so it is only useful for synchronizing
- *	concurrent use of page buffer objects, not for synchronizing independent
- *	access to the underlying pages.
+ *	Locks a buffer object, if it is not already locked.
+ *	Note that this in no way locks the underlying pages, so it is only
+ *	useful for synchronizing concurrent use of buffer objects, not for
+ *	synchronizing independent access to the underlying pages.
  */
 int
-pagebuf_cond_lock(			/* lock buffer, if not locked	*/
-					/* returns -EBUSY if locked)	*/
-	xfs_buf_t		*pb)
+xfs_buf_cond_lock(
+	xfs_buf_t		*bp)
 {
 	int			locked;
 
-	locked = down_trylock(&pb->pb_sema) == 0;
+	locked = down_trylock(&bp->b_sema) == 0;
 	if (locked) {
-		PB_SET_OWNER(pb);
+		XB_SET_OWNER(bp);
 	}
-	PB_TRACE(pb, "cond_lock", (long)locked);
-	return(locked ? 0 : -EBUSY);
+	XB_TRACE(bp, "cond_lock", (long)locked);
+	return locked ? 0 : -EBUSY;
 }
 
 #if defined(DEBUG) || defined(XFS_BLI_TRACE)
-/*
- *	pagebuf_lock_value
- *
- *	Return lock value for a pagebuf
- */
 int
-pagebuf_lock_value(
-	xfs_buf_t		*pb)
+xfs_buf_lock_value(
+	xfs_buf_t		*bp)
 {
-	return(atomic_read(&pb->pb_sema.count));
+	return atomic_read(&bp->b_sema.count);
 }
 #endif
 
 /*
- *	pagebuf_lock
- *
- *	pagebuf_lock locks a buffer object.  Note that this in no way
- *	locks the underlying pages, so it is only useful for synchronizing
- *	concurrent use of page buffer objects, not for synchronizing independent
- *	access to the underlying pages.
+ *	Locks a buffer object.
+ *	Note that this in no way locks the underlying pages, so it is only
+ *	useful for synchronizing concurrent use of buffer objects, not for
+ *	synchronizing independent access to the underlying pages.
  */
-int
-pagebuf_lock(
-	xfs_buf_t		*pb)
+void
+xfs_buf_lock(
+	xfs_buf_t		*bp)
 {
-	PB_TRACE(pb, "lock", 0);
-	if (atomic_read(&pb->pb_io_remaining))
-		blk_run_address_space(pb->pb_target->pbr_mapping);
-	down(&pb->pb_sema);
-	PB_SET_OWNER(pb);
-	PB_TRACE(pb, "locked", 0);
-	return 0;
+	XB_TRACE(bp, "lock", 0);
+	if (atomic_read(&bp->b_io_remaining))
+		blk_run_address_space(bp->b_target->bt_mapping);
+	down(&bp->b_sema);
+	XB_SET_OWNER(bp);
+	XB_TRACE(bp, "locked", 0);
 }
 
 /*
- *	pagebuf_unlock
- *
- *	pagebuf_unlock releases the lock on the buffer object created by
- *	pagebuf_lock or pagebuf_cond_lock (not any pinning of underlying pages
- *	created by pagebuf_pin).
- *
+ *	Releases the lock on the buffer object.
  *	If the buffer is marked delwri but is not queued, do so before we
- *	unlock the buffer as we need to set flags correctly. We also need to
+ *	unlock the buffer as we need to set flags correctly.  We also need to
  *	take a reference for the delwri queue because the unlocker is going to
  *	drop their's and they don't know we just queued it.
  */
 void
-pagebuf_unlock(				/* unlock buffer		*/
-	xfs_buf_t		*pb)	/* buffer to unlock		*/
+xfs_buf_unlock(
+	xfs_buf_t		*bp)
 {
-	if ((pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q)) == PBF_DELWRI) {
-		atomic_inc(&pb->pb_hold);
-		pb->pb_flags |= PBF_ASYNC;
-		pagebuf_delwri_queue(pb, 0);
+	if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) {
+		atomic_inc(&bp->b_hold);
+		bp->b_flags |= XBF_ASYNC;
+		xfs_buf_delwri_queue(bp, 0);
 	}
 
-	PB_CLEAR_OWNER(pb);
-	up(&pb->pb_sema);
-	PB_TRACE(pb, "unlock", 0);
+	XB_CLEAR_OWNER(bp);
+	up(&bp->b_sema);
+	XB_TRACE(bp, "unlock", 0);
 }
 
 
 /*
  *	Pinning Buffer Storage in Memory
- */
-
-/*
- *	pagebuf_pin
- *
- *	pagebuf_pin locks all of the memory represented by a buffer in
- *	memory.  Multiple calls to pagebuf_pin and pagebuf_unpin, for
- *	the same or different buffers affecting a given page, will
- *	properly count the number of outstanding "pin" requests.  The
- *	buffer may be released after the pagebuf_pin and a different
- *	buffer used when calling pagebuf_unpin, if desired.
- *	pagebuf_pin should be used by the file system when it wants be
- *	assured that no attempt will be made to force the affected
- *	memory to disk.	 It does not assure that a given logical page
- *	will not be moved to a different physical page.
+ *	Ensure that no attempt to force a buffer to disk will succeed.
  */
 void
-pagebuf_pin(
-	xfs_buf_t		*pb)
+xfs_buf_pin(
+	xfs_buf_t		*bp)
 {
-	atomic_inc(&pb->pb_pin_count);
-	PB_TRACE(pb, "pin", (long)pb->pb_pin_count.counter);
+	atomic_inc(&bp->b_pin_count);
+	XB_TRACE(bp, "pin", (long)bp->b_pin_count.counter);
 }
 
-/*
- *	pagebuf_unpin
- *
- *	pagebuf_unpin reverses the locking of memory performed by
- *	pagebuf_pin.  Note that both functions affected the logical
- *	pages associated with the buffer, not the buffer itself.
- */
 void
-pagebuf_unpin(
-	xfs_buf_t		*pb)
+xfs_buf_unpin(
+	xfs_buf_t		*bp)
 {
-	if (atomic_dec_and_test(&pb->pb_pin_count)) {
-		wake_up_all(&pb->pb_waiters);
-	}
-	PB_TRACE(pb, "unpin", (long)pb->pb_pin_count.counter);
+	if (atomic_dec_and_test(&bp->b_pin_count))
+		wake_up_all(&bp->b_waiters);
+	XB_TRACE(bp, "unpin", (long)bp->b_pin_count.counter);
 }
 
 int
-pagebuf_ispin(
-	xfs_buf_t		*pb)
+xfs_buf_ispin(
+	xfs_buf_t		*bp)
 {
-	return atomic_read(&pb->pb_pin_count);
+	return atomic_read(&bp->b_pin_count);
 }
 
-/*
- *	pagebuf_wait_unpin
- *
- *	pagebuf_wait_unpin waits until all of the memory associated
- *	with the buffer is not longer locked in memory.  It returns
- *	immediately if none of the affected pages are locked.
- */
-static inline void
-_pagebuf_wait_unpin(
-	xfs_buf_t		*pb)
+STATIC void
+xfs_buf_wait_unpin(
+	xfs_buf_t		*bp)
 {
 	DECLARE_WAITQUEUE	(wait, current);
 
-	if (atomic_read(&pb->pb_pin_count) == 0)
+	if (atomic_read(&bp->b_pin_count) == 0)
 		return;
 
-	add_wait_queue(&pb->pb_waiters, &wait);
+	add_wait_queue(&bp->b_waiters, &wait);
 	for (;;) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
-		if (atomic_read(&pb->pb_pin_count) == 0)
+		if (atomic_read(&bp->b_pin_count) == 0)
 			break;
-		if (atomic_read(&pb->pb_io_remaining))
-			blk_run_address_space(pb->pb_target->pbr_mapping);
+		if (atomic_read(&bp->b_io_remaining))
+			blk_run_address_space(bp->b_target->bt_mapping);
 		schedule();
 	}
-	remove_wait_queue(&pb->pb_waiters, &wait);
+	remove_wait_queue(&bp->b_waiters, &wait);
 	set_current_state(TASK_RUNNING);
 }
 
@@ -1032,241 +978,216 @@ _pagebuf_wait_unpin(
  *	Buffer Utility Routines
  */
 
-/*
- *	pagebuf_iodone
- *
- *	pagebuf_iodone marks a buffer for which I/O is in progress
- *	done with respect to that I/O.	The pb_iodone routine, if
- *	present, will be called as a side-effect.
- */
 STATIC void
-pagebuf_iodone_work(
+xfs_buf_iodone_work(
 	void			*v)
 {
 	xfs_buf_t		*bp = (xfs_buf_t *)v;
 
-	if (bp->pb_iodone)
-		(*(bp->pb_iodone))(bp);
-	else if (bp->pb_flags & PBF_ASYNC)
+	if (bp->b_iodone)
+		(*(bp->b_iodone))(bp);
+	else if (bp->b_flags & XBF_ASYNC)
 		xfs_buf_relse(bp);
 }
 
 void
-pagebuf_iodone(
-	xfs_buf_t		*pb,
+xfs_buf_ioend(
+	xfs_buf_t		*bp,
 	int			schedule)
 {
-	pb->pb_flags &= ~(PBF_READ | PBF_WRITE);
-	if (pb->pb_error == 0)
-		pb->pb_flags |= PBF_DONE;
+	bp->b_flags &= ~(XBF_READ | XBF_WRITE);
+	if (bp->b_error == 0)
+		bp->b_flags |= XBF_DONE;
 
-	PB_TRACE(pb, "iodone", pb->pb_iodone);
+	XB_TRACE(bp, "iodone", bp->b_iodone);
 
-	if ((pb->pb_iodone) || (pb->pb_flags & PBF_ASYNC)) {
+	if ((bp->b_iodone) || (bp->b_flags & XBF_ASYNC)) {
 		if (schedule) {
-			INIT_WORK(&pb->pb_iodone_work, pagebuf_iodone_work, pb);
-			queue_work(xfslogd_workqueue, &pb->pb_iodone_work);
+			INIT_WORK(&bp->b_iodone_work, xfs_buf_iodone_work, bp);
+			queue_work(xfslogd_workqueue, &bp->b_iodone_work);
 		} else {
-			pagebuf_iodone_work(pb);
+			xfs_buf_iodone_work(bp);
 		}
 	} else {
-		up(&pb->pb_iodonesema);
+		up(&bp->b_iodonesema);
 	}
 }
 
-/*
- *	pagebuf_ioerror
- *
- *	pagebuf_ioerror sets the error code for a buffer.
- */
 void
-pagebuf_ioerror(			/* mark/clear buffer error flag */
-	xfs_buf_t		*pb,	/* buffer to mark		*/
-	int			error)	/* error to store (0 if none)	*/
+xfs_buf_ioerror(
+	xfs_buf_t		*bp,
+	int			error)
 {
 	ASSERT(error >= 0 && error <= 0xffff);
-	pb->pb_error = (unsigned short)error;
-	PB_TRACE(pb, "ioerror", (unsigned long)error);
+	bp->b_error = (unsigned short)error;
+	XB_TRACE(bp, "ioerror", (unsigned long)error);
 }
 
 /*
- *	pagebuf_iostart
- *
- *	pagebuf_iostart initiates I/O on a buffer, based on the flags supplied.
- *	If necessary, it will arrange for any disk space allocation required,
- *	and it will break up the request if the block mappings require it.
- *	The pb_iodone routine in the buffer supplied will only be called
+ *	Initiate I/O on a buffer, based on the flags supplied.
+ *	The b_iodone routine in the buffer supplied will only be called
  *	when all of the subsidiary I/O requests, if any, have been completed.
- *	pagebuf_iostart calls the pagebuf_ioinitiate routine or
- *	pagebuf_iorequest, if the former routine is not defined, to start
- *	the I/O on a given low-level request.
  */
 int
-pagebuf_iostart(			/* start I/O on a buffer	  */
-	xfs_buf_t		*pb,	/* buffer to start		  */
-	page_buf_flags_t	flags)	/* PBF_LOCK, PBF_ASYNC, PBF_READ, */
-					/* PBF_WRITE, PBF_DELWRI,	  */
-					/* PBF_DONT_BLOCK		  */
+xfs_buf_iostart(
+	xfs_buf_t		*bp,
+	xfs_buf_flags_t		flags)
 {
 	int			status = 0;
 
-	PB_TRACE(pb, "iostart", (unsigned long)flags);
+	XB_TRACE(bp, "iostart", (unsigned long)flags);
 
-	if (flags & PBF_DELWRI) {
-		pb->pb_flags &= ~(PBF_READ | PBF_WRITE | PBF_ASYNC);
-		pb->pb_flags |= flags & (PBF_DELWRI | PBF_ASYNC);
-		pagebuf_delwri_queue(pb, 1);
+	if (flags & XBF_DELWRI) {
+		bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_ASYNC);
+		bp->b_flags |= flags & (XBF_DELWRI | XBF_ASYNC);
+		xfs_buf_delwri_queue(bp, 1);
 		return status;
 	}
 
-	pb->pb_flags &= ~(PBF_READ | PBF_WRITE | PBF_ASYNC | PBF_DELWRI | \
-			PBF_READ_AHEAD | _PBF_RUN_QUEUES);
-	pb->pb_flags |= flags & (PBF_READ | PBF_WRITE | PBF_ASYNC | \
-			PBF_READ_AHEAD | _PBF_RUN_QUEUES);
+	bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_ASYNC | XBF_DELWRI | \
+			XBF_READ_AHEAD | _XBF_RUN_QUEUES);
+	bp->b_flags |= flags & (XBF_READ | XBF_WRITE | XBF_ASYNC | \
+			XBF_READ_AHEAD | _XBF_RUN_QUEUES);
 
-	BUG_ON(pb->pb_bn == XFS_BUF_DADDR_NULL);
+	BUG_ON(bp->b_bn == XFS_BUF_DADDR_NULL);
 
 	/* For writes allow an alternate strategy routine to precede
 	 * the actual I/O request (which may not be issued at all in
 	 * a shutdown situation, for example).
 	 */
-	status = (flags & PBF_WRITE) ?
-		pagebuf_iostrategy(pb) : pagebuf_iorequest(pb);
+	status = (flags & XBF_WRITE) ?
+		xfs_buf_iostrategy(bp) : xfs_buf_iorequest(bp);
 
 	/* Wait for I/O if we are not an async request.
 	 * Note: async I/O request completion will release the buffer,
 	 * and that can already be done by this point.  So using the
 	 * buffer pointer from here on, after async I/O, is invalid.
 	 */
-	if (!status && !(flags & PBF_ASYNC))
-		status = pagebuf_iowait(pb);
+	if (!status && !(flags & XBF_ASYNC))
+		status = xfs_buf_iowait(bp);
 
 	return status;
 }
 
-/*
- * Helper routine for pagebuf_iorequest
- */
-
 STATIC __inline__ int
-_pagebuf_iolocked(
-	xfs_buf_t		*pb)
+_xfs_buf_iolocked(
+	xfs_buf_t		*bp)
 {
-	ASSERT(pb->pb_flags & (PBF_READ|PBF_WRITE));
-	if (pb->pb_flags & PBF_READ)
-		return pb->pb_locked;
+	ASSERT(bp->b_flags & (XBF_READ | XBF_WRITE));
+	if (bp->b_flags & XBF_READ)
+		return bp->b_locked;
 	return 0;
 }
 
 STATIC __inline__ void
-_pagebuf_iodone(
-	xfs_buf_t		*pb,
+_xfs_buf_ioend(
+	xfs_buf_t		*bp,
 	int			schedule)
 {
-	if (atomic_dec_and_test(&pb->pb_io_remaining) == 1) {
-		pb->pb_locked = 0;
-		pagebuf_iodone(pb, schedule);
+	if (atomic_dec_and_test(&bp->b_io_remaining) == 1) {
+		bp->b_locked = 0;
+		xfs_buf_ioend(bp, schedule);
 	}
 }
 
 STATIC int
-bio_end_io_pagebuf(
+xfs_buf_bio_end_io(
 	struct bio		*bio,
 	unsigned int		bytes_done,
 	int			error)
 {
-	xfs_buf_t		*pb = (xfs_buf_t *)bio->bi_private;
-	unsigned int		blocksize = pb->pb_target->pbr_bsize;
+	xfs_buf_t		*bp = (xfs_buf_t *)bio->bi_private;
+	unsigned int		blocksize = bp->b_target->bt_bsize;
 	struct bio_vec		*bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
 
 	if (bio->bi_size)
 		return 1;
 
 	if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
-		pb->pb_error = EIO;
+		bp->b_error = EIO;
 
 	do {
 		struct page	*page = bvec->bv_page;
 
-		if (unlikely(pb->pb_error)) {
-			if (pb->pb_flags & PBF_READ)
+		if (unlikely(bp->b_error)) {
+			if (bp->b_flags & XBF_READ)
 				ClearPageUptodate(page);
 			SetPageError(page);
-		} else if (blocksize == PAGE_CACHE_SIZE) {
+		} else if (blocksize >= PAGE_CACHE_SIZE) {
 			SetPageUptodate(page);
 		} else if (!PagePrivate(page) &&
-				(pb->pb_flags & _PBF_PAGE_CACHE)) {
+				(bp->b_flags & _XBF_PAGE_CACHE)) {
 			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)) {
+		if (_xfs_buf_iolocked(bp)) {
 			unlock_page(page);
 		}
 	} while (bvec >= bio->bi_io_vec);
 
-	_pagebuf_iodone(pb, 1);
+	_xfs_buf_ioend(bp, 1);
 	bio_put(bio);
 	return 0;
 }
 
 STATIC void
-_pagebuf_ioapply(
-	xfs_buf_t		*pb)
+_xfs_buf_ioapply(
+	xfs_buf_t		*bp)
 {
 	int			i, rw, map_i, total_nr_pages, nr_pages;
 	struct bio		*bio;
-	int			offset = pb->pb_offset;
-	int			size = pb->pb_count_desired;
-	sector_t		sector = pb->pb_bn;
-	unsigned int		blocksize = pb->pb_target->pbr_bsize;
-	int			locking = _pagebuf_iolocked(pb);
+	int			offset = bp->b_offset;
+	int			size = bp->b_count_desired;
+	sector_t		sector = bp->b_bn;
+	unsigned int		blocksize = bp->b_target->bt_bsize;
+	int			locking = _xfs_buf_iolocked(bp);
 
-	total_nr_pages = pb->pb_page_count;
+	total_nr_pages = bp->b_page_count;
 	map_i = 0;
 
-	if (pb->pb_flags & _PBF_RUN_QUEUES) {
-		pb->pb_flags &= ~_PBF_RUN_QUEUES;
-		rw = (pb->pb_flags & PBF_READ) ? READ_SYNC : WRITE_SYNC;
+	if (bp->b_flags & _XBF_RUN_QUEUES) {
+		bp->b_flags &= ~_XBF_RUN_QUEUES;
+		rw = (bp->b_flags & XBF_READ) ? READ_SYNC : WRITE_SYNC;
 	} else {
-		rw = (pb->pb_flags & PBF_READ) ? READ : WRITE;
+		rw = (bp->b_flags & XBF_READ) ? READ : WRITE;
 	}
 
-	if (pb->pb_flags & PBF_ORDERED) {
-		ASSERT(!(pb->pb_flags & PBF_READ));
+	if (bp->b_flags & XBF_ORDERED) {
+		ASSERT(!(bp->b_flags & XBF_READ));
 		rw = WRITE_BARRIER;
 	}
 
-	/* Special code path for reading a sub page size pagebuf in --
+	/* Special code path for reading a sub page size buffer in --
 	 * we populate up the whole page, and hence the other metadata
 	 * in the same page.  This optimization is only valid when the
-	 * filesystem block size and the page size are equal.
+	 * filesystem block size is not smaller than the page size.
 	 */
-	if ((pb->pb_buffer_length < PAGE_CACHE_SIZE) &&
-	    (pb->pb_flags & PBF_READ) && locking &&
-	    (blocksize == PAGE_CACHE_SIZE)) {
+	if ((bp->b_buffer_length < PAGE_CACHE_SIZE) &&
+	    (bp->b_flags & XBF_READ) && locking &&
+	    (blocksize >= PAGE_CACHE_SIZE)) {
 		bio = bio_alloc(GFP_NOIO, 1);
 
-		bio->bi_bdev = pb->pb_target->pbr_bdev;
+		bio->bi_bdev = bp->b_target->bt_bdev;
 		bio->bi_sector = sector - (offset >> BBSHIFT);
-		bio->bi_end_io = bio_end_io_pagebuf;
-		bio->bi_private = pb;
+		bio->bi_end_io = xfs_buf_bio_end_io;
+		bio->bi_private = bp;
 
-		bio_add_page(bio, pb->pb_pages[0], PAGE_CACHE_SIZE, 0);
+		bio_add_page(bio, bp->b_pages[0], PAGE_CACHE_SIZE, 0);
 		size = 0;
 
-		atomic_inc(&pb->pb_io_remaining);
+		atomic_inc(&bp->b_io_remaining);
 
 		goto submit_io;
 	}
 
 	/* Lock down the pages which we need to for the request */
-	if (locking && (pb->pb_flags & PBF_WRITE) && (pb->pb_locked == 0)) {
+	if (locking && (bp->b_flags & XBF_WRITE) && (bp->b_locked == 0)) {
 		for (i = 0; size; i++) {
 			int		nbytes = PAGE_CACHE_SIZE - offset;
-			struct page	*page = pb->pb_pages[i];
+			struct page	*page = bp->b_pages[i];
 
 			if (nbytes > size)
 				nbytes = size;
@@ -1276,30 +1197,30 @@ _pagebuf_ioapply(
 			size -= nbytes;
 			offset = 0;
 		}
-		offset = pb->pb_offset;
-		size = pb->pb_count_desired;
+		offset = bp->b_offset;
+		size = bp->b_count_desired;
 	}
 
 next_chunk:
-	atomic_inc(&pb->pb_io_remaining);
+	atomic_inc(&bp->b_io_remaining);
 	nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT);
 	if (nr_pages > total_nr_pages)
 		nr_pages = total_nr_pages;
 
 	bio = bio_alloc(GFP_NOIO, nr_pages);
-	bio->bi_bdev = pb->pb_target->pbr_bdev;
+	bio->bi_bdev = bp->b_target->bt_bdev;
 	bio->bi_sector = sector;
-	bio->bi_end_io = bio_end_io_pagebuf;
-	bio->bi_private = pb;
+	bio->bi_end_io = xfs_buf_bio_end_io;
+	bio->bi_private = bp;
 
 	for (; size && nr_pages; nr_pages--, map_i++) {
-		int	nbytes = PAGE_CACHE_SIZE - offset;
+		int	rbytes, nbytes = PAGE_CACHE_SIZE - offset;
 
 		if (nbytes > size)
 			nbytes = size;
 
-		if (bio_add_page(bio, pb->pb_pages[map_i],
-					nbytes, offset) < nbytes)
+		rbytes = bio_add_page(bio, bp->b_pages[map_i], nbytes, offset);
+		if (rbytes < nbytes)
 			break;
 
 		offset = 0;
@@ -1315,107 +1236,102 @@ submit_io:
 			goto next_chunk;
 	} else {
 		bio_put(bio);
-		pagebuf_ioerror(pb, EIO);
+		xfs_buf_ioerror(bp, EIO);
 	}
 }
 
-/*
- *	pagebuf_iorequest -- the core I/O request routine.
- */
 int
-pagebuf_iorequest(			/* start real I/O		*/
-	xfs_buf_t		*pb)	/* buffer to convey to device	*/
+xfs_buf_iorequest(
+	xfs_buf_t		*bp)
 {
-	PB_TRACE(pb, "iorequest", 0);
+	XB_TRACE(bp, "iorequest", 0);
 
-	if (pb->pb_flags & PBF_DELWRI) {
-		pagebuf_delwri_queue(pb, 1);
+	if (bp->b_flags & XBF_DELWRI) {
+		xfs_buf_delwri_queue(bp, 1);
 		return 0;
 	}
 
-	if (pb->pb_flags & PBF_WRITE) {
-		_pagebuf_wait_unpin(pb);
+	if (bp->b_flags & XBF_WRITE) {
+		xfs_buf_wait_unpin(bp);
 	}
 
-	pagebuf_hold(pb);
+	xfs_buf_hold(bp);
 
 	/* Set the count to 1 initially, this will stop an I/O
 	 * completion callout which happens before we have started
-	 * all the I/O from calling pagebuf_iodone too early.
+	 * all the I/O from calling xfs_buf_ioend too early.
 	 */
-	atomic_set(&pb->pb_io_remaining, 1);
-	_pagebuf_ioapply(pb);
-	_pagebuf_iodone(pb, 0);
+	atomic_set(&bp->b_io_remaining, 1);
+	_xfs_buf_ioapply(bp);
+	_xfs_buf_ioend(bp, 0);
 
-	pagebuf_rele(pb);
+	xfs_buf_rele(bp);
 	return 0;
 }
 
 /*
- *	pagebuf_iowait
- *
- *	pagebuf_iowait waits for I/O to complete on the buffer supplied.
- *	It returns immediately if no I/O is pending.  In any case, it returns
- *	the error code, if any, or 0 if there is no error.
+ *	Waits for I/O to complete on the buffer supplied.
+ *	It returns immediately if no I/O is pending.
+ *	It returns the I/O error code, if any, or 0 if there was no error.
  */
 int
-pagebuf_iowait(
-	xfs_buf_t		*pb)
+xfs_buf_iowait(
+	xfs_buf_t		*bp)
 {
-	PB_TRACE(pb, "iowait", 0);
-	if (atomic_read(&pb->pb_io_remaining))
-		blk_run_address_space(pb->pb_target->pbr_mapping);
-	down(&pb->pb_iodonesema);
-	PB_TRACE(pb, "iowaited", (long)pb->pb_error);
-	return pb->pb_error;
+	XB_TRACE(bp, "iowait", 0);
+	if (atomic_read(&bp->b_io_remaining))
+		blk_run_address_space(bp->b_target->bt_mapping);
+	down(&bp->b_iodonesema);
+	XB_TRACE(bp, "iowaited", (long)bp->b_error);
+	return bp->b_error;
 }
 
-caddr_t
-pagebuf_offset(
-	xfs_buf_t		*pb,
+xfs_caddr_t
+xfs_buf_offset(
+	xfs_buf_t		*bp,
 	size_t			offset)
 {
 	struct page		*page;
 
-	offset += pb->pb_offset;
+	if (bp->b_flags & XBF_MAPPED)
+		return XFS_BUF_PTR(bp) + offset;
 
-	page = pb->pb_pages[offset >> PAGE_CACHE_SHIFT];
-	return (caddr_t) page_address(page) + (offset & (PAGE_CACHE_SIZE - 1));
+	offset += bp->b_offset;
+	page = bp->b_pages[offset >> PAGE_CACHE_SHIFT];
+	return (xfs_caddr_t)page_address(page) + (offset & (PAGE_CACHE_SIZE-1));
 }
 
 /*
- *	pagebuf_iomove
- *
  *	Move data into or out of a buffer.
  */
 void
-pagebuf_iomove(
-	xfs_buf_t		*pb,	/* buffer to process		*/
+xfs_buf_iomove(
+	xfs_buf_t		*bp,	/* buffer to process		*/
 	size_t			boff,	/* starting buffer offset	*/
 	size_t			bsize,	/* length to copy		*/
 	caddr_t			data,	/* data address			*/
-	page_buf_rw_t		mode)	/* read/write flag		*/
+	xfs_buf_rw_t		mode)	/* read/write/zero flag		*/
 {
 	size_t			bend, cpoff, csize;
 	struct page		*page;
 
 	bend = boff + bsize;
 	while (boff < bend) {
-		page = pb->pb_pages[page_buf_btoct(boff + pb->pb_offset)];
-		cpoff = page_buf_poff(boff + pb->pb_offset);
+		page = bp->b_pages[xfs_buf_btoct(boff + bp->b_offset)];
+		cpoff = xfs_buf_poff(boff + bp->b_offset);
 		csize = min_t(size_t,
-			      PAGE_CACHE_SIZE-cpoff, pb->pb_count_desired-boff);
+			      PAGE_CACHE_SIZE-cpoff, bp->b_count_desired-boff);
 
 		ASSERT(((csize + cpoff) <= PAGE_CACHE_SIZE));
 
 		switch (mode) {
-		case PBRW_ZERO:
+		case XBRW_ZERO:
 			memset(page_address(page) + cpoff, 0, csize);
 			break;
-		case PBRW_READ:
+		case XBRW_READ:
 			memcpy(data, page_address(page) + cpoff, csize);
 			break;
-		case PBRW_WRITE:
+		case XBRW_WRITE:
 			memcpy(page_address(page) + cpoff, data, csize);
 		}
 
@@ -1425,12 +1341,12 @@ pagebuf_iomove(
 }
 
 /*
- *	Handling of buftargs.
+ *	Handling of buffer targets (buftargs).
  */
 
 /*
- * Wait for any bufs with callbacks that have been submitted but
- * have not yet returned... walk the hash list for the target.
+ *	Wait for any bufs with callbacks that have been submitted but
+ *	have not yet returned... walk the hash list for the target.
  */
 void
 xfs_wait_buftarg(
@@ -1444,15 +1360,15 @@ xfs_wait_buftarg(
 		hash = &btp->bt_hash[i];
 again:
 		spin_lock(&hash->bh_lock);
-		list_for_each_entry_safe(bp, n, &hash->bh_list, pb_hash_list) {
-			ASSERT(btp == bp->pb_target);
-			if (!(bp->pb_flags & PBF_FS_MANAGED)) {
+		list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) {
+			ASSERT(btp == bp->b_target);
+			if (!(bp->b_flags & XBF_FS_MANAGED)) {
 				spin_unlock(&hash->bh_lock);
 				/*
 				 * Catch superblock reference count leaks
 				 * immediately
 				 */
-				BUG_ON(bp->pb_bn == 0);
+				BUG_ON(bp->b_bn == 0);
 				delay(100);
 				goto again;
 			}
@@ -1462,9 +1378,9 @@ again:
 }
 
 /*
- * Allocate buffer hash table for a given target.
- * For devices containing metadata (i.e. not the log/realtime devices)
- * we need to allocate a much larger hash table.
+ *	Allocate buffer hash table for a given target.
+ *	For devices containing metadata (i.e. not the log/realtime devices)
+ *	we need to allocate a much larger hash table.
  */
 STATIC void
 xfs_alloc_bufhash(
@@ -1487,11 +1403,34 @@ STATIC void
 xfs_free_bufhash(
 	xfs_buftarg_t		*btp)
 {
-	kmem_free(btp->bt_hash,
-			(1 << btp->bt_hashshift) * sizeof(xfs_bufhash_t));
+	kmem_free(btp->bt_hash, (1<<btp->bt_hashshift) * sizeof(xfs_bufhash_t));
 	btp->bt_hash = NULL;
 }
 
+/*
+ *	buftarg list for delwrite queue processing
+ */
+STATIC LIST_HEAD(xfs_buftarg_list);
+STATIC DEFINE_SPINLOCK(xfs_buftarg_lock);
+
+STATIC void
+xfs_register_buftarg(
+	xfs_buftarg_t           *btp)
+{
+	spin_lock(&xfs_buftarg_lock);
+	list_add(&btp->bt_list, &xfs_buftarg_list);
+	spin_unlock(&xfs_buftarg_lock);
+}
+
+STATIC void
+xfs_unregister_buftarg(
+	xfs_buftarg_t           *btp)
+{
+	spin_lock(&xfs_buftarg_lock);
+	list_del(&btp->bt_list);
+	spin_unlock(&xfs_buftarg_lock);
+}
+
 void
 xfs_free_buftarg(
 	xfs_buftarg_t		*btp,
@@ -1499,9 +1438,16 @@ xfs_free_buftarg(
 {
 	xfs_flush_buftarg(btp, 1);
 	if (external)
-		xfs_blkdev_put(btp->pbr_bdev);
+		xfs_blkdev_put(btp->bt_bdev);
 	xfs_free_bufhash(btp);
-	iput(btp->pbr_mapping->host);
+	iput(btp->bt_mapping->host);
+
+	/* Unregister the buftarg first so that we don't get a
+	 * wakeup finding a non-existent task
+	 */
+	xfs_unregister_buftarg(btp);
+	kthread_stop(btp->bt_task);
+
 	kmem_free(btp, sizeof(*btp));
 }
 
@@ -1512,11 +1458,11 @@ xfs_setsize_buftarg_flags(
 	unsigned int		sectorsize,
 	int			verbose)
 {
-	btp->pbr_bsize = blocksize;
-	btp->pbr_sshift = ffs(sectorsize) - 1;
-	btp->pbr_smask = sectorsize - 1;
+	btp->bt_bsize = blocksize;
+	btp->bt_sshift = ffs(sectorsize) - 1;
+	btp->bt_smask = sectorsize - 1;
 
-	if (set_blocksize(btp->pbr_bdev, sectorsize)) {
+	if (set_blocksize(btp->bt_bdev, sectorsize)) {
 		printk(KERN_WARNING
 			"XFS: Cannot set_blocksize to %u on device %s\n",
 			sectorsize, XFS_BUFTARG_NAME(btp));
@@ -1536,10 +1482,10 @@ xfs_setsize_buftarg_flags(
 }
 
 /*
-* When allocating the initial buffer target we have not yet
-* read in the superblock, so don't know what sized sectors
-* are being used is at this early stage.  Play safe.
-*/
+ *	When allocating the initial buffer target we have not yet
+ *	read in the superblock, so don't know what sized sectors
+ *	are being used is at this early stage.  Play safe.
+ */
 STATIC int
 xfs_setsize_buftarg_early(
 	xfs_buftarg_t		*btp,
@@ -1587,10 +1533,30 @@ xfs_mapping_buftarg(
 	mapping->a_ops = &mapping_aops;
 	mapping->backing_dev_info = bdi;
 	mapping_set_gfp_mask(mapping, GFP_NOFS);
-	btp->pbr_mapping = mapping;
+	btp->bt_mapping = mapping;
 	return 0;
 }
 
+STATIC int
+xfs_alloc_delwrite_queue(
+	xfs_buftarg_t		*btp)
+{
+	int	error = 0;
+
+	INIT_LIST_HEAD(&btp->bt_list);
+	INIT_LIST_HEAD(&btp->bt_delwrite_queue);
+	spinlock_init(&btp->bt_delwrite_lock, "delwri_lock");
+	btp->bt_flags = 0;
+	btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd");
+	if (IS_ERR(btp->bt_task)) {
+		error = PTR_ERR(btp->bt_task);
+		goto out_error;
+	}
+	xfs_register_buftarg(btp);
+out_error:
+	return error;
+}
+
 xfs_buftarg_t *
 xfs_alloc_buftarg(
 	struct block_device	*bdev,
@@ -1600,12 +1566,14 @@ xfs_alloc_buftarg(
 
 	btp = kmem_zalloc(sizeof(*btp), KM_SLEEP);
 
-	btp->pbr_dev =  bdev->bd_dev;
-	btp->pbr_bdev = bdev;
+	btp->bt_dev =  bdev->bd_dev;
+	btp->bt_bdev = bdev;
 	if (xfs_setsize_buftarg_early(btp, bdev))
 		goto error;
 	if (xfs_mapping_buftarg(btp, bdev))
 		goto error;
+	if (xfs_alloc_delwrite_queue(btp))
+		goto error;
 	xfs_alloc_bufhash(btp, external);
 	return btp;
 
@@ -1616,83 +1584,81 @@ error:
 
 
 /*
- * Pagebuf delayed write buffer handling
+ *	Delayed write buffer handling
  */
-
-STATIC LIST_HEAD(pbd_delwrite_queue);
-STATIC DEFINE_SPINLOCK(pbd_delwrite_lock);
-
 STATIC void
-pagebuf_delwri_queue(
-	xfs_buf_t		*pb,
+xfs_buf_delwri_queue(
+	xfs_buf_t		*bp,
 	int			unlock)
 {
-	PB_TRACE(pb, "delwri_q", (long)unlock);
-	ASSERT((pb->pb_flags & (PBF_DELWRI|PBF_ASYNC)) ==
-					(PBF_DELWRI|PBF_ASYNC));
+	struct list_head	*dwq = &bp->b_target->bt_delwrite_queue;
+	spinlock_t		*dwlk = &bp->b_target->bt_delwrite_lock;
+
+	XB_TRACE(bp, "delwri_q", (long)unlock);
+	ASSERT((bp->b_flags&(XBF_DELWRI|XBF_ASYNC)) == (XBF_DELWRI|XBF_ASYNC));
 
-	spin_lock(&pbd_delwrite_lock);
+	spin_lock(dwlk);
 	/* If already in the queue, dequeue and place at tail */
-	if (!list_empty(&pb->pb_list)) {
-		ASSERT(pb->pb_flags & _PBF_DELWRI_Q);
-		if (unlock) {
-			atomic_dec(&pb->pb_hold);
-		}
-		list_del(&pb->pb_list);
+	if (!list_empty(&bp->b_list)) {
+		ASSERT(bp->b_flags & _XBF_DELWRI_Q);
+		if (unlock)
+			atomic_dec(&bp->b_hold);
+		list_del(&bp->b_list);
 	}
 
-	pb->pb_flags |= _PBF_DELWRI_Q;
-	list_add_tail(&pb->pb_list, &pbd_delwrite_queue);
-	pb->pb_queuetime = jiffies;
-	spin_unlock(&pbd_delwrite_lock);
+	bp->b_flags |= _XBF_DELWRI_Q;
+	list_add_tail(&bp->b_list, dwq);
+	bp->b_queuetime = jiffies;
+	spin_unlock(dwlk);
 
 	if (unlock)
-		pagebuf_unlock(pb);
+		xfs_buf_unlock(bp);
 }
 
 void
-pagebuf_delwri_dequeue(
-	xfs_buf_t		*pb)
+xfs_buf_delwri_dequeue(
+	xfs_buf_t		*bp)
 {
+	spinlock_t		*dwlk = &bp->b_target->bt_delwrite_lock;
 	int			dequeued = 0;
 
-	spin_lock(&pbd_delwrite_lock);
-	if ((pb->pb_flags & PBF_DELWRI) && !list_empty(&pb->pb_list)) {
-		ASSERT(pb->pb_flags & _PBF_DELWRI_Q);
-		list_del_init(&pb->pb_list);
+	spin_lock(dwlk);
+	if ((bp->b_flags & XBF_DELWRI) && !list_empty(&bp->b_list)) {
+		ASSERT(bp->b_flags & _XBF_DELWRI_Q);
+		list_del_init(&bp->b_list);
 		dequeued = 1;
 	}
-	pb->pb_flags &= ~(PBF_DELWRI|_PBF_DELWRI_Q);
-	spin_unlock(&pbd_delwrite_lock);
+	bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q);
+	spin_unlock(dwlk);
 
 	if (dequeued)
-		pagebuf_rele(pb);
+		xfs_buf_rele(bp);
 
-	PB_TRACE(pb, "delwri_dq", (long)dequeued);
+	XB_TRACE(bp, "delwri_dq", (long)dequeued);
 }
 
 STATIC void
-pagebuf_runall_queues(
+xfs_buf_runall_queues(
 	struct workqueue_struct	*queue)
 {
 	flush_workqueue(queue);
 }
 
-/* Defines for pagebuf daemon */
-STATIC struct task_struct *xfsbufd_task;
-STATIC int xfsbufd_force_flush;
-STATIC int xfsbufd_force_sleep;
-
 STATIC int
 xfsbufd_wakeup(
 	int			priority,
 	gfp_t			mask)
 {
-	if (xfsbufd_force_sleep)
-		return 0;
-	xfsbufd_force_flush = 1;
-	barrier();
-	wake_up_process(xfsbufd_task);
+	xfs_buftarg_t		*btp;
+
+	spin_lock(&xfs_buftarg_lock);
+	list_for_each_entry(btp, &xfs_buftarg_list, bt_list) {
+		if (test_bit(XBT_FORCE_SLEEP, &btp->bt_flags))
+			continue;
+		set_bit(XBT_FORCE_FLUSH, &btp->bt_flags);
+		wake_up_process(btp->bt_task);
+	}
+	spin_unlock(&xfs_buftarg_lock);
 	return 0;
 }
 
@@ -1702,67 +1668,70 @@ xfsbufd(
 {
 	struct list_head	tmp;
 	unsigned long		age;
-	xfs_buftarg_t		*target;
-	xfs_buf_t		*pb, *n;
+	xfs_buftarg_t		*target = (xfs_buftarg_t *)data;
+	xfs_buf_t		*bp, *n;
+	struct list_head	*dwq = &target->bt_delwrite_queue;
+	spinlock_t		*dwlk = &target->bt_delwrite_lock;
 
 	current->flags |= PF_MEMALLOC;
 
 	INIT_LIST_HEAD(&tmp);
 	do {
 		if (unlikely(freezing(current))) {
-			xfsbufd_force_sleep = 1;
+			set_bit(XBT_FORCE_SLEEP, &target->bt_flags);
 			refrigerator();
 		} else {
-			xfsbufd_force_sleep = 0;
+			clear_bit(XBT_FORCE_SLEEP, &target->bt_flags);
 		}
 
 		schedule_timeout_interruptible(
 			xfs_buf_timer_centisecs * msecs_to_jiffies(10));
 
 		age = xfs_buf_age_centisecs * msecs_to_jiffies(10);
-		spin_lock(&pbd_delwrite_lock);
-		list_for_each_entry_safe(pb, n, &pbd_delwrite_queue, pb_list) {
-			PB_TRACE(pb, "walkq1", (long)pagebuf_ispin(pb));
-			ASSERT(pb->pb_flags & PBF_DELWRI);
-
-			if (!pagebuf_ispin(pb) && !pagebuf_cond_lock(pb)) {
-				if (!xfsbufd_force_flush &&
+		spin_lock(dwlk);
+		list_for_each_entry_safe(bp, n, dwq, b_list) {
+			XB_TRACE(bp, "walkq1", (long)xfs_buf_ispin(bp));
+			ASSERT(bp->b_flags & XBF_DELWRI);
+
+			if (!xfs_buf_ispin(bp) && !xfs_buf_cond_lock(bp)) {
+				if (!test_bit(XBT_FORCE_FLUSH,
+						&target->bt_flags) &&
 				    time_before(jiffies,
-						pb->pb_queuetime + age)) {
-					pagebuf_unlock(pb);
+						bp->b_queuetime + age)) {
+					xfs_buf_unlock(bp);
 					break;
 				}
 
-				pb->pb_flags &= ~(PBF_DELWRI|_PBF_DELWRI_Q);
-				pb->pb_flags |= PBF_WRITE;
-				list_move(&pb->pb_list, &tmp);
+				bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q);
+				bp->b_flags |= XBF_WRITE;
+				list_move(&bp->b_list, &tmp);
 			}
 		}
-		spin_unlock(&pbd_delwrite_lock);
+		spin_unlock(dwlk);
 
 		while (!list_empty(&tmp)) {
-			pb = list_entry(tmp.next, xfs_buf_t, pb_list);
-			target = pb->pb_target;
+			bp = list_entry(tmp.next, xfs_buf_t, b_list);
+			ASSERT(target == bp->b_target);
 
-			list_del_init(&pb->pb_list);
-			pagebuf_iostrategy(pb);
+			list_del_init(&bp->b_list);
+			xfs_buf_iostrategy(bp);
 
-			blk_run_address_space(target->pbr_mapping);
+			blk_run_address_space(target->bt_mapping);
 		}
 
 		if (as_list_len > 0)
 			purge_addresses();
 
-		xfsbufd_force_flush = 0;
+		clear_bit(XBT_FORCE_FLUSH, &target->bt_flags);
 	} while (!kthread_should_stop());
 
 	return 0;
 }
 
 /*
- * Go through all incore buffers, and release buffers if they belong to
- * the given device. This is used in filesystem error handling to
- * preserve the consistency of its metadata.
+ *	Go through all incore buffers, and release buffers if they belong to
+ *	the given device. This is used in filesystem error handling to
+ *	preserve the consistency of its metadata.
  */
 int
 xfs_flush_buftarg(
@@ -1770,73 +1739,72 @@ xfs_flush_buftarg(
 	int			wait)
 {
 	struct list_head	tmp;
-	xfs_buf_t		*pb, *n;
+	xfs_buf_t		*bp, *n;
 	int			pincount = 0;
+	struct list_head	*dwq = &target->bt_delwrite_queue;
+	spinlock_t		*dwlk = &target->bt_delwrite_lock;
 
-	pagebuf_runall_queues(xfsdatad_workqueue);
-	pagebuf_runall_queues(xfslogd_workqueue);
+	xfs_buf_runall_queues(xfsdatad_workqueue);
+	xfs_buf_runall_queues(xfslogd_workqueue);
 
 	INIT_LIST_HEAD(&tmp);
-	spin_lock(&pbd_delwrite_lock);
-	list_for_each_entry_safe(pb, n, &pbd_delwrite_queue, pb_list) {
-
-		if (pb->pb_target != target)
-			continue;
-
-		ASSERT(pb->pb_flags & (PBF_DELWRI|_PBF_DELWRI_Q));
-		PB_TRACE(pb, "walkq2", (long)pagebuf_ispin(pb));
-		if (pagebuf_ispin(pb)) {
+	spin_lock(dwlk);
+	list_for_each_entry_safe(bp, n, dwq, b_list) {
+		ASSERT(bp->b_target == target);
+		ASSERT(bp->b_flags & (XBF_DELWRI | _XBF_DELWRI_Q));
+		XB_TRACE(bp, "walkq2", (long)xfs_buf_ispin(bp));
+		if (xfs_buf_ispin(bp)) {
 			pincount++;
 			continue;
 		}
 
-		list_move(&pb->pb_list, &tmp);
+		list_move(&bp->b_list, &tmp);
 	}
-	spin_unlock(&pbd_delwrite_lock);
+	spin_unlock(dwlk);
 
 	/*
 	 * Dropped the delayed write list lock, now walk the temporary list
 	 */
-	list_for_each_entry_safe(pb, n, &tmp, pb_list) {
-		pagebuf_lock(pb);
-		pb->pb_flags &= ~(PBF_DELWRI|_PBF_DELWRI_Q);
-		pb->pb_flags |= PBF_WRITE;
+	list_for_each_entry_safe(bp, n, &tmp, b_list) {
+		xfs_buf_lock(bp);
+		bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q);
+		bp->b_flags |= XBF_WRITE;
 		if (wait)
-			pb->pb_flags &= ~PBF_ASYNC;
+			bp->b_flags &= ~XBF_ASYNC;
 		else
-			list_del_init(&pb->pb_list);
+			list_del_init(&bp->b_list);
 
-		pagebuf_iostrategy(pb);
+		xfs_buf_iostrategy(bp);
 	}
 
 	/*
 	 * Remaining list items must be flushed before returning
 	 */
 	while (!list_empty(&tmp)) {
-		pb = list_entry(tmp.next, xfs_buf_t, pb_list);
+		bp = list_entry(tmp.next, xfs_buf_t, b_list);
 
-		list_del_init(&pb->pb_list);
-		xfs_iowait(pb);
-		xfs_buf_relse(pb);
+		list_del_init(&bp->b_list);
+		xfs_iowait(bp);
+		xfs_buf_relse(bp);
 	}
 
 	if (wait)
-		blk_run_address_space(target->pbr_mapping);
+		blk_run_address_space(target->bt_mapping);
 
 	return pincount;
 }
 
 int __init
-pagebuf_init(void)
+xfs_buf_init(void)
 {
 	int		error = -ENOMEM;
 
-#ifdef PAGEBUF_TRACE
-	pagebuf_trace_buf = ktrace_alloc(PAGEBUF_TRACE_SIZE, KM_SLEEP);
+#ifdef XFS_BUF_TRACE
+	xfs_buf_trace_buf = ktrace_alloc(XFS_BUF_TRACE_SIZE, KM_SLEEP);
 #endif
 
-	pagebuf_zone = kmem_zone_init(sizeof(xfs_buf_t), "xfs_buf");
-	if (!pagebuf_zone)
+	xfs_buf_zone = kmem_zone_init(sizeof(xfs_buf_t), "xfs_buf");
+	if (!xfs_buf_zone)
 		goto out_free_trace_buf;
 
 	xfslogd_workqueue = create_workqueue("xfslogd");
@@ -1847,42 +1815,33 @@ pagebuf_init(void)
 	if (!xfsdatad_workqueue)
 		goto out_destroy_xfslogd_workqueue;
 
-	xfsbufd_task = kthread_run(xfsbufd, NULL, "xfsbufd");
-	if (IS_ERR(xfsbufd_task)) {
-		error = PTR_ERR(xfsbufd_task);
+	xfs_buf_shake = kmem_shake_register(xfsbufd_wakeup);
+	if (!xfs_buf_shake)
 		goto out_destroy_xfsdatad_workqueue;
-	}
-
-	pagebuf_shake = kmem_shake_register(xfsbufd_wakeup);
-	if (!pagebuf_shake)
-		goto out_stop_xfsbufd;
 
 	return 0;
 
- out_stop_xfsbufd:
-	kthread_stop(xfsbufd_task);
  out_destroy_xfsdatad_workqueue:
 	destroy_workqueue(xfsdatad_workqueue);
  out_destroy_xfslogd_workqueue:
 	destroy_workqueue(xfslogd_workqueue);
  out_free_buf_zone:
-	kmem_zone_destroy(pagebuf_zone);
+	kmem_zone_destroy(xfs_buf_zone);
  out_free_trace_buf:
-#ifdef PAGEBUF_TRACE
-	ktrace_free(pagebuf_trace_buf);
+#ifdef XFS_BUF_TRACE
+	ktrace_free(xfs_buf_trace_buf);
 #endif
 	return error;
 }
 
 void
-pagebuf_terminate(void)
+xfs_buf_terminate(void)
 {
-	kmem_shake_deregister(pagebuf_shake);
-	kthread_stop(xfsbufd_task);
+	kmem_shake_deregister(xfs_buf_shake);
 	destroy_workqueue(xfsdatad_workqueue);
 	destroy_workqueue(xfslogd_workqueue);
-	kmem_zone_destroy(pagebuf_zone);
-#ifdef PAGEBUF_TRACE
-	ktrace_free(pagebuf_trace_buf);
+	kmem_zone_destroy(xfs_buf_zone);
+#ifdef XFS_BUF_TRACE
+	ktrace_free(xfs_buf_trace_buf);
 #endif
 }
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index 237a35b915d1..4dd6592d5a4c 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -32,44 +32,47 @@
  *	Base types
  */
 
-#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
-
-#define page_buf_ctob(pp)	((pp) * PAGE_CACHE_SIZE)
-#define page_buf_btoc(dd)	(((dd) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
-#define page_buf_btoct(dd)	((dd) >> PAGE_CACHE_SHIFT)
-#define page_buf_poff(aa)	((aa) & ~PAGE_CACHE_MASK)
-
-typedef enum page_buf_rw_e {
-	PBRW_READ = 1,			/* transfer into target memory */
-	PBRW_WRITE = 2,			/* transfer from target memory */
-	PBRW_ZERO = 3			/* Zero target memory */
-} page_buf_rw_t;
-
-
-typedef enum page_buf_flags_e {		/* pb_flags values */
-	PBF_READ = (1 << 0),	/* buffer intended for reading from device */
-	PBF_WRITE = (1 << 1),	/* buffer intended for writing to device   */
-	PBF_MAPPED = (1 << 2),  /* buffer mapped (pb_addr valid)           */
-	PBF_ASYNC = (1 << 4),   /* initiator will not wait for completion  */
-	PBF_DONE = (1 << 5),    /* all pages in the buffer uptodate	   */
-	PBF_DELWRI = (1 << 6),  /* buffer has dirty pages                  */
-	PBF_STALE = (1 << 7),	/* buffer has been staled, do not find it  */
-	PBF_FS_MANAGED = (1 << 8),  /* filesystem controls freeing memory  */
- 	PBF_ORDERED = (1 << 11),    /* use ordered writes		   */
-	PBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead		   */
+#define XFS_BUF_DADDR_NULL	((xfs_daddr_t) (-1LL))
+
+#define xfs_buf_ctob(pp)	((pp) * PAGE_CACHE_SIZE)
+#define xfs_buf_btoc(dd)	(((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT)
+#define xfs_buf_btoct(dd)	((dd) >> PAGE_CACHE_SHIFT)
+#define xfs_buf_poff(aa)	((aa) & ~PAGE_CACHE_MASK)
+
+typedef enum {
+	XBRW_READ = 1,			/* transfer into target memory */
+	XBRW_WRITE = 2,			/* transfer from target memory */
+	XBRW_ZERO = 3,			/* Zero target memory */
+} xfs_buf_rw_t;
+
+typedef enum {
+	XBF_READ = (1 << 0),	/* buffer intended for reading from device */
+	XBF_WRITE = (1 << 1),	/* buffer intended for writing to device   */
+	XBF_MAPPED = (1 << 2),  /* buffer mapped (b_addr valid)            */
+	XBF_ASYNC = (1 << 4),   /* initiator will not wait for completion  */
+	XBF_DONE = (1 << 5),    /* all pages in the buffer uptodate	   */
+	XBF_DELWRI = (1 << 6),  /* buffer has dirty pages                  */
+	XBF_STALE = (1 << 7),	/* buffer has been staled, do not find it  */
+	XBF_FS_MANAGED = (1 << 8),  /* filesystem controls freeing memory  */
+ 	XBF_ORDERED = (1 << 11),    /* use ordered writes		   */
+	XBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead		   */
 
 	/* flags used only as arguments to access routines */
-	PBF_LOCK = (1 << 14),       /* lock requested			   */
-	PBF_TRYLOCK = (1 << 15),    /* lock requested, but do not wait	   */
-	PBF_DONT_BLOCK = (1 << 16), /* do not block in current thread	   */
+	XBF_LOCK = (1 << 14),       /* lock requested			   */
+	XBF_TRYLOCK = (1 << 15),    /* lock requested, but do not wait	   */
+	XBF_DONT_BLOCK = (1 << 16), /* do not block in current thread	   */
 
 	/* flags used only internally */
-	_PBF_PAGE_CACHE = (1 << 17),/* backed by pagecache		   */
-	_PBF_KMEM_ALLOC = (1 << 18),/* backed by kmem_alloc()		   */
-	_PBF_RUN_QUEUES = (1 << 19),/* run block device task queue	   */
-	_PBF_DELWRI_Q = (1 << 21),   /* buffer on delwri queue		   */
-} page_buf_flags_t;
+	_XBF_PAGE_CACHE = (1 << 17),/* backed by pagecache		   */
+	_XBF_KMEM_ALLOC = (1 << 18),/* backed by kmem_alloc()		   */
+	_XBF_RUN_QUEUES = (1 << 19),/* run block device task queue	   */
+	_XBF_DELWRI_Q = (1 << 21),   /* buffer on delwri queue		   */
+} xfs_buf_flags_t;
 
+typedef enum {
+	XBT_FORCE_SLEEP = (0 << 1),
+	XBT_FORCE_FLUSH = (1 << 1),
+} xfs_buftarg_flags_t;
 
 typedef struct xfs_bufhash {
 	struct list_head	bh_list;
@@ -77,477 +80,350 @@ typedef struct xfs_bufhash {
 } xfs_bufhash_t;
 
 typedef struct xfs_buftarg {
-	dev_t			pbr_dev;
-	struct block_device	*pbr_bdev;
-	struct address_space	*pbr_mapping;
-	unsigned int		pbr_bsize;
-	unsigned int		pbr_sshift;
-	size_t			pbr_smask;
-
-	/* per-device buffer hash table */
+	dev_t			bt_dev;
+	struct block_device	*bt_bdev;
+	struct address_space	*bt_mapping;
+	unsigned int		bt_bsize;
+	unsigned int		bt_sshift;
+	size_t			bt_smask;
+
+	/* per device buffer hash table */
 	uint			bt_hashmask;
 	uint			bt_hashshift;
 	xfs_bufhash_t		*bt_hash;
+
+	/* per device delwri queue */
+	struct task_struct	*bt_task;
+	struct list_head	bt_list;
+	struct list_head	bt_delwrite_queue;
+	spinlock_t		bt_delwrite_lock;
+	unsigned long		bt_flags;
 } xfs_buftarg_t;
 
 /*
- *	xfs_buf_t:  Buffer structure for page cache-based buffers
+ *	xfs_buf_t:  Buffer structure for pagecache-based buffers
+ *
+ * This buffer structure is used by the pagecache buffer management routines
+ * to refer to an assembly of pages forming a logical buffer.
  *
- * This buffer structure is used by the page cache buffer management routines
- * to refer to an assembly of pages forming a logical buffer.  The actual I/O
- * is performed with buffer_head structures, as required by drivers.
- * 
- * The buffer structure is used on temporary basis only, and discarded when
- * released.  The real data storage is recorded in the page cache.  Metadata is
+ * The buffer structure is used on a temporary basis only, and discarded when
+ * released.  The real data storage is recorded in the pagecache. Buffers are
  * hashed to the block device on which the file system resides.
  */
 
 struct xfs_buf;
+typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
+typedef void (*xfs_buf_relse_t)(struct xfs_buf *);
+typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *);
 
-/* call-back function on I/O completion */
-typedef void (*page_buf_iodone_t)(struct xfs_buf *);
-/* call-back function on I/O completion */
-typedef void (*page_buf_relse_t)(struct xfs_buf *);
-/* pre-write function */
-typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
-
-#define PB_PAGES	2
+#define XB_PAGES	2
 
 typedef struct xfs_buf {
-	struct semaphore	pb_sema;	/* semaphore for lockables  */
-	unsigned long		pb_queuetime;	/* time buffer was queued   */
-	atomic_t		pb_pin_count;	/* pin count		    */
-	wait_queue_head_t	pb_waiters;	/* unpin waiters	    */
-	struct list_head	pb_list;
-	page_buf_flags_t	pb_flags;	/* status flags */
-	struct list_head	pb_hash_list;	/* hash table list */
-	xfs_bufhash_t		*pb_hash;	/* hash table list start */
-	xfs_buftarg_t		*pb_target;	/* buffer target (device) */
-	atomic_t		pb_hold;	/* reference count */
-	xfs_daddr_t		pb_bn;		/* block number for I/O */
-	loff_t			pb_file_offset;	/* offset in file */
-	size_t			pb_buffer_length; /* size of buffer in bytes */
-	size_t			pb_count_desired; /* desired transfer size */
-	void			*pb_addr;	/* virtual address of buffer */
-	struct work_struct	pb_iodone_work;
-	atomic_t		pb_io_remaining;/* #outstanding I/O requests */
-	page_buf_iodone_t	pb_iodone;	/* I/O completion function */
-	page_buf_relse_t	pb_relse;	/* releasing function */
-	page_buf_bdstrat_t	pb_strat;	/* pre-write function */
-	struct semaphore	pb_iodonesema;	/* Semaphore for I/O waiters */
-	void			*pb_fspriv;
-	void			*pb_fspriv2;
-	void			*pb_fspriv3;
-	unsigned short		pb_error;	/* error code on I/O */
- 	unsigned short		pb_locked;	/* page array is locked */
- 	unsigned int		pb_page_count;	/* size of page array */
-	unsigned int		pb_offset;	/* page offset in first page */
-	struct page		**pb_pages;	/* array of page pointers */
-	struct page		*pb_page_array[PB_PAGES]; /* inline pages */
-#ifdef PAGEBUF_LOCK_TRACKING
-	int			pb_last_holder;
+	struct semaphore	b_sema;		/* semaphore for lockables */
+	unsigned long		b_queuetime;	/* time buffer was queued */
+	atomic_t		b_pin_count;	/* pin count */
+	wait_queue_head_t	b_waiters;	/* unpin waiters */
+	struct list_head	b_list;
+	xfs_buf_flags_t		b_flags;	/* status flags */
+	struct list_head	b_hash_list;	/* hash table list */
+	xfs_bufhash_t		*b_hash;	/* hash table list start */
+	xfs_buftarg_t		*b_target;	/* buffer target (device) */
+	atomic_t		b_hold;		/* reference count */
+	xfs_daddr_t		b_bn;		/* block number for I/O */
+	xfs_off_t		b_file_offset;	/* offset in file */
+	size_t			b_buffer_length;/* size of buffer in bytes */
+	size_t			b_count_desired;/* desired transfer size */
+	void			*b_addr;	/* virtual address of buffer */
+	struct work_struct	b_iodone_work;
+	atomic_t		b_io_remaining;	/* #outstanding I/O requests */
+	xfs_buf_iodone_t	b_iodone;	/* I/O completion function */
+	xfs_buf_relse_t		b_relse;	/* releasing function */
+	xfs_buf_bdstrat_t	b_strat;	/* pre-write function */
+	struct semaphore	b_iodonesema;	/* Semaphore for I/O waiters */
+	void			*b_fspriv;
+	void			*b_fspriv2;
+	void			*b_fspriv3;
+	unsigned short		b_error;	/* error code on I/O */
+	unsigned short		b_locked;	/* page array is locked */
+	unsigned int		b_page_count;	/* size of page array */
+	unsigned int		b_offset;	/* page offset in first page */
+	struct page		**b_pages;	/* array of page pointers */
+	struct page		*b_page_array[XB_PAGES]; /* inline pages */
+#ifdef XFS_BUF_LOCK_TRACKING
+	int			b_last_holder;
 #endif
 } xfs_buf_t;
 
 
 /* Finding and Reading Buffers */
-
-extern xfs_buf_t *_pagebuf_find(	/* find buffer for block if	*/
-					/* the block is in memory	*/
-		xfs_buftarg_t *,	/* inode for block		*/
-		loff_t,			/* starting offset of range	*/
-		size_t,			/* length of range		*/
-		page_buf_flags_t,	/* PBF_LOCK			*/
-	        xfs_buf_t *);		/* newly allocated buffer	*/
-
+extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
+				xfs_buf_flags_t, xfs_buf_t *);
 #define xfs_incore(buftarg,blkno,len,lockit) \
-	_pagebuf_find(buftarg, blkno ,len, lockit, NULL)
-
-extern xfs_buf_t *xfs_buf_get_flags(	/* allocate a buffer		*/
-		xfs_buftarg_t *,	/* inode for buffer		*/
-		loff_t,			/* starting offset of range     */
-		size_t,			/* length of range              */
-		page_buf_flags_t);	/* PBF_LOCK, PBF_READ,		*/
-					/* PBF_ASYNC			*/
+	_xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
 
+extern xfs_buf_t *xfs_buf_get_flags(xfs_buftarg_t *, xfs_off_t, size_t,
+				xfs_buf_flags_t);
 #define xfs_buf_get(target, blkno, len, flags) \
-	xfs_buf_get_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
-
-extern xfs_buf_t *xfs_buf_read_flags(	/* allocate and read a buffer	*/
-		xfs_buftarg_t *,	/* inode for buffer		*/
-		loff_t,			/* starting offset of range	*/
-		size_t,			/* length of range		*/
-		page_buf_flags_t);	/* PBF_LOCK, PBF_ASYNC		*/
+	xfs_buf_get_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
 
+extern xfs_buf_t *xfs_buf_read_flags(xfs_buftarg_t *, xfs_off_t, size_t,
+				xfs_buf_flags_t);
 #define xfs_buf_read(target, blkno, len, flags) \
-	xfs_buf_read_flags((target), (blkno), (len), PBF_LOCK | PBF_MAPPED)
-
-extern xfs_buf_t *pagebuf_get_empty(	/* allocate pagebuf struct with	*/
-					/*  no memory or disk address	*/
-		size_t len,
-		xfs_buftarg_t *);	/* mount point "fake" inode	*/
-
-extern xfs_buf_t *pagebuf_get_no_daddr(/* allocate pagebuf struct	*/
-					/* without disk address		*/
-		size_t len,
-		xfs_buftarg_t *);	/* mount point "fake" inode	*/
-
-extern int pagebuf_associate_memory(
-		xfs_buf_t *,
-		void *,
-		size_t);
-
-extern void pagebuf_hold(		/* increment reference count	*/
-		xfs_buf_t *);		/* buffer to hold		*/
+	xfs_buf_read_flags((target), (blkno), (len), XBF_LOCK | XBF_MAPPED)
 
-extern void pagebuf_readahead(		/* read ahead into cache	*/
-		xfs_buftarg_t  *,	/* target for buffer (or NULL)	*/
-		loff_t,			/* starting offset of range     */
-		size_t,			/* length of range              */
-		page_buf_flags_t);	/* additional read flags	*/
+extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
+extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
+extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
+extern void xfs_buf_hold(xfs_buf_t *);
+extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,
+				xfs_buf_flags_t);
 
 /* Releasing Buffers */
-
-extern void pagebuf_free(		/* deallocate a buffer		*/
-		xfs_buf_t *);		/* buffer to deallocate		*/
-
-extern void pagebuf_rele(		/* release hold on a buffer	*/
-		xfs_buf_t *);		/* buffer to release		*/
+extern void xfs_buf_free(xfs_buf_t *);
+extern void xfs_buf_rele(xfs_buf_t *);
 
 /* Locking and Unlocking Buffers */
-
-extern int pagebuf_cond_lock(		/* lock buffer, if not locked	*/
-					/* (returns -EBUSY if locked)	*/
-		xfs_buf_t *);		/* buffer to lock		*/
-
-extern int pagebuf_lock_value(		/* return count on lock		*/
-		xfs_buf_t *);          /* buffer to check              */
-
-extern int pagebuf_lock(		/* lock buffer                  */
-		xfs_buf_t *);          /* buffer to lock               */
-
-extern void pagebuf_unlock(		/* unlock buffer		*/
-		xfs_buf_t *);		/* buffer to unlock		*/
+extern int xfs_buf_cond_lock(xfs_buf_t *);
+extern int xfs_buf_lock_value(xfs_buf_t *);
+extern void xfs_buf_lock(xfs_buf_t *);
+extern void xfs_buf_unlock(xfs_buf_t *);
 
 /* Buffer Read and Write Routines */
-
-extern void pagebuf_iodone(		/* mark buffer I/O complete	*/
-		xfs_buf_t *,		/* buffer to mark		*/
-		int);			/* run completion locally, or in
-					 * a helper thread.		*/
-
-extern void pagebuf_ioerror(		/* mark buffer in error	(or not) */
-		xfs_buf_t *,		/* buffer to mark		*/
-		int);			/* error to store (0 if none)	*/
-
-extern int pagebuf_iostart(		/* start I/O on a buffer	*/
-		xfs_buf_t *,		/* buffer to start		*/
-		page_buf_flags_t);	/* PBF_LOCK, PBF_ASYNC,		*/
-					/* PBF_READ, PBF_WRITE,		*/
-					/* PBF_DELWRI			*/
-
-extern int pagebuf_iorequest(		/* start real I/O		*/
-		xfs_buf_t *);		/* buffer to convey to device	*/
-
-extern int pagebuf_iowait(		/* wait for buffer I/O done	*/
-		xfs_buf_t *);		/* buffer to wait on		*/
-
-extern void pagebuf_iomove(		/* move data in/out of pagebuf	*/
-		xfs_buf_t *,		/* buffer to manipulate		*/
-		size_t,			/* starting buffer offset	*/
-		size_t,			/* length in buffer		*/
-		caddr_t,		/* data pointer			*/
-		page_buf_rw_t);		/* direction			*/
-
-static inline int pagebuf_iostrategy(xfs_buf_t *pb)
+extern void xfs_buf_ioend(xfs_buf_t *,	int);
+extern void xfs_buf_ioerror(xfs_buf_t *, int);
+extern int xfs_buf_iostart(xfs_buf_t *, xfs_buf_flags_t);
+extern int xfs_buf_iorequest(xfs_buf_t *);
+extern int xfs_buf_iowait(xfs_buf_t *);
+extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t,
+				xfs_buf_rw_t);
+
+static inline int xfs_buf_iostrategy(xfs_buf_t *bp)
 {
-	return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
+	return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp);
 }
 
-static inline int pagebuf_geterror(xfs_buf_t *pb)
+static inline int xfs_buf_geterror(xfs_buf_t *bp)
 {
-	return pb ? pb->pb_error : ENOMEM;
+	return bp ? bp->b_error : ENOMEM;
 }
 
 /* Buffer Utility Routines */
-
-extern caddr_t pagebuf_offset(		/* pointer at offset in buffer	*/
-		xfs_buf_t *,		/* buffer to offset into	*/
-		size_t);		/* offset			*/
+extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t);
 
 /* Pinning Buffer Storage in Memory */
-
-extern void pagebuf_pin(		/* pin buffer in memory		*/
-		xfs_buf_t *);		/* buffer to pin		*/
-
-extern void pagebuf_unpin(		/* unpin buffered data		*/
-		xfs_buf_t *);		/* buffer to unpin		*/
-
-extern int pagebuf_ispin(		/* check if buffer is pinned	*/
-		xfs_buf_t *);		/* buffer to check		*/
+extern void xfs_buf_pin(xfs_buf_t *);
+extern void xfs_buf_unpin(xfs_buf_t *);
+extern int xfs_buf_ispin(xfs_buf_t *);
 
 /* Delayed Write Buffer Routines */
-
-extern void pagebuf_delwri_dequeue(xfs_buf_t *);
+extern void xfs_buf_delwri_dequeue(xfs_buf_t *);
 
 /* Buffer Daemon Setup Routines */
+extern int xfs_buf_init(void);
+extern void xfs_buf_terminate(void);
 
-extern int pagebuf_init(void);
-extern void pagebuf_terminate(void);
-
-
-#ifdef PAGEBUF_TRACE
-extern ktrace_t *pagebuf_trace_buf;
-extern void pagebuf_trace(
-		xfs_buf_t *,		/* buffer being traced		*/
-		char *,			/* description of operation	*/
-		void *,			/* arbitrary diagnostic value	*/
-		void *);		/* return address		*/
+#ifdef XFS_BUF_TRACE
+extern ktrace_t *xfs_buf_trace_buf;
+extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *);
 #else
-# define pagebuf_trace(pb, id, ptr, ra)	do { } while (0)
+#define xfs_buf_trace(bp,id,ptr,ra)	do { } while (0)
 #endif
 
-#define pagebuf_target_name(target)	\
-	({ char __b[BDEVNAME_SIZE]; bdevname((target)->pbr_bdev, __b); __b; })
+#define xfs_buf_target_name(target)	\
+	({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; })
 
 
+#define XFS_B_ASYNC		XBF_ASYNC
+#define XFS_B_DELWRI		XBF_DELWRI
+#define XFS_B_READ		XBF_READ
+#define XFS_B_WRITE		XBF_WRITE
+#define XFS_B_STALE		XBF_STALE
 
-/* These are just for xfs_syncsub... it sets an internal variable
- * then passes it to VOP_FLUSH_PAGES or adds the flags to a newly gotten buf_t
- */
-#define XFS_B_ASYNC		PBF_ASYNC
-#define XFS_B_DELWRI		PBF_DELWRI
-#define XFS_B_READ		PBF_READ
-#define XFS_B_WRITE		PBF_WRITE
-#define XFS_B_STALE		PBF_STALE
-
-#define XFS_BUF_TRYLOCK		PBF_TRYLOCK
-#define XFS_INCORE_TRYLOCK	PBF_TRYLOCK
-#define XFS_BUF_LOCK		PBF_LOCK
-#define XFS_BUF_MAPPED		PBF_MAPPED
-
-#define BUF_BUSY		PBF_DONT_BLOCK
-
-#define XFS_BUF_BFLAGS(x)	((x)->pb_flags)
-#define XFS_BUF_ZEROFLAGS(x)	\
-	((x)->pb_flags &= ~(PBF_READ|PBF_WRITE|PBF_ASYNC|PBF_DELWRI))
-
-#define XFS_BUF_STALE(x)	((x)->pb_flags |= XFS_B_STALE)
-#define XFS_BUF_UNSTALE(x)	((x)->pb_flags &= ~XFS_B_STALE)
-#define XFS_BUF_ISSTALE(x)	((x)->pb_flags & XFS_B_STALE)
-#define XFS_BUF_SUPER_STALE(x)	do {				\
-					XFS_BUF_STALE(x);	\
-					pagebuf_delwri_dequeue(x);	\
-					XFS_BUF_DONE(x);	\
-				} while (0)
+#define XFS_BUF_TRYLOCK		XBF_TRYLOCK
+#define XFS_INCORE_TRYLOCK	XBF_TRYLOCK
+#define XFS_BUF_LOCK		XBF_LOCK
+#define XFS_BUF_MAPPED		XBF_MAPPED
 
-#define XFS_BUF_MANAGE		PBF_FS_MANAGED
-#define XFS_BUF_UNMANAGE(x)	((x)->pb_flags &= ~PBF_FS_MANAGED)
-
-#define XFS_BUF_DELAYWRITE(x)	 ((x)->pb_flags |= PBF_DELWRI)
-#define XFS_BUF_UNDELAYWRITE(x)	 pagebuf_delwri_dequeue(x)
-#define XFS_BUF_ISDELAYWRITE(x)	 ((x)->pb_flags & PBF_DELWRI)
-
-#define XFS_BUF_ERROR(x,no)	 pagebuf_ioerror(x,no)
-#define XFS_BUF_GETERROR(x)	 pagebuf_geterror(x)
-#define XFS_BUF_ISERROR(x)	 (pagebuf_geterror(x)?1:0)
-
-#define XFS_BUF_DONE(x)		 ((x)->pb_flags |= PBF_DONE)
-#define XFS_BUF_UNDONE(x)	 ((x)->pb_flags &= ~PBF_DONE)
-#define XFS_BUF_ISDONE(x)	 ((x)->pb_flags & PBF_DONE)
-
-#define XFS_BUF_BUSY(x)		 do { } while (0)
-#define XFS_BUF_UNBUSY(x)	 do { } while (0)
-#define XFS_BUF_ISBUSY(x)	 (1)
-
-#define XFS_BUF_ASYNC(x)	 ((x)->pb_flags |= PBF_ASYNC)
-#define XFS_BUF_UNASYNC(x)	 ((x)->pb_flags &= ~PBF_ASYNC)
-#define XFS_BUF_ISASYNC(x)	 ((x)->pb_flags & PBF_ASYNC)
-
-#define XFS_BUF_ORDERED(x)	 ((x)->pb_flags |= PBF_ORDERED)
-#define XFS_BUF_UNORDERED(x)	 ((x)->pb_flags &= ~PBF_ORDERED)
-#define XFS_BUF_ISORDERED(x)	 ((x)->pb_flags & PBF_ORDERED)
-
-#define XFS_BUF_SHUT(x)		 printk("XFS_BUF_SHUT not implemented yet\n")
-#define XFS_BUF_UNSHUT(x)	 printk("XFS_BUF_UNSHUT not implemented yet\n")
-#define XFS_BUF_ISSHUT(x)	 (0)
-
-#define XFS_BUF_HOLD(x)		pagebuf_hold(x)
-#define XFS_BUF_READ(x)		((x)->pb_flags |= PBF_READ)
-#define XFS_BUF_UNREAD(x)	((x)->pb_flags &= ~PBF_READ)
-#define XFS_BUF_ISREAD(x)	((x)->pb_flags & PBF_READ)
-
-#define XFS_BUF_WRITE(x)	((x)->pb_flags |= PBF_WRITE)
-#define XFS_BUF_UNWRITE(x)	((x)->pb_flags &= ~PBF_WRITE)
-#define XFS_BUF_ISWRITE(x)	((x)->pb_flags & PBF_WRITE)
-
-#define XFS_BUF_ISUNINITIAL(x)	 (0)
-#define XFS_BUF_UNUNINITIAL(x)	 (0)
-
-#define XFS_BUF_BP_ISMAPPED(bp)	 1
-
-#define XFS_BUF_IODONE_FUNC(buf)	(buf)->pb_iodone
-#define XFS_BUF_SET_IODONE_FUNC(buf, func)	\
-			(buf)->pb_iodone = (func)
-#define XFS_BUF_CLR_IODONE_FUNC(buf)		\
-			(buf)->pb_iodone = NULL
-#define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)	\
-			(buf)->pb_strat = (func)
-#define XFS_BUF_CLR_BDSTRAT_FUNC(buf)		\
-			(buf)->pb_strat = NULL
-
-#define XFS_BUF_FSPRIVATE(buf, type)		\
-			((type)(buf)->pb_fspriv)
-#define XFS_BUF_SET_FSPRIVATE(buf, value)	\
-			(buf)->pb_fspriv = (void *)(value)
-#define XFS_BUF_FSPRIVATE2(buf, type)		\
-			((type)(buf)->pb_fspriv2)
-#define XFS_BUF_SET_FSPRIVATE2(buf, value)	\
-			(buf)->pb_fspriv2 = (void *)(value)
-#define XFS_BUF_FSPRIVATE3(buf, type)		\
-			((type)(buf)->pb_fspriv3)
-#define XFS_BUF_SET_FSPRIVATE3(buf, value)	\
-			(buf)->pb_fspriv3  = (void *)(value)
-#define XFS_BUF_SET_START(buf)
-
-#define XFS_BUF_SET_BRELSE_FUNC(buf, value) \
-			(buf)->pb_relse = (value)
-
-#define XFS_BUF_PTR(bp)		(xfs_caddr_t)((bp)->pb_addr)
-
-static inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
-{
-	if (bp->pb_flags & PBF_MAPPED)
-		return XFS_BUF_PTR(bp) + offset;
-	return (xfs_caddr_t) pagebuf_offset(bp, offset);
-}
+#define BUF_BUSY		XBF_DONT_BLOCK
+
+#define XFS_BUF_BFLAGS(bp)	((bp)->b_flags)
+#define XFS_BUF_ZEROFLAGS(bp)	\
+	((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI))
+
+#define XFS_BUF_STALE(bp)	((bp)->b_flags |= XFS_B_STALE)
+#define XFS_BUF_UNSTALE(bp)	((bp)->b_flags &= ~XFS_B_STALE)
+#define XFS_BUF_ISSTALE(bp)	((bp)->b_flags & XFS_B_STALE)
+#define XFS_BUF_SUPER_STALE(bp)	do {				\
+					XFS_BUF_STALE(bp);	\
+					xfs_buf_delwri_dequeue(bp);	\
+					XFS_BUF_DONE(bp);	\
+				} while (0)
 
-#define XFS_BUF_SET_PTR(bp, val, count)		\
-				pagebuf_associate_memory(bp, val, count)
-#define XFS_BUF_ADDR(bp)	((bp)->pb_bn)
-#define XFS_BUF_SET_ADDR(bp, blk)		\
-			((bp)->pb_bn = (xfs_daddr_t)(blk))
-#define XFS_BUF_OFFSET(bp)	((bp)->pb_file_offset)
-#define XFS_BUF_SET_OFFSET(bp, off)		\
-			((bp)->pb_file_offset = (off))
-#define XFS_BUF_COUNT(bp)	((bp)->pb_count_desired)
-#define XFS_BUF_SET_COUNT(bp, cnt)		\
-			((bp)->pb_count_desired = (cnt))
-#define XFS_BUF_SIZE(bp)	((bp)->pb_buffer_length)
-#define XFS_BUF_SET_SIZE(bp, cnt)		\
-			((bp)->pb_buffer_length = (cnt))
-#define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
-#define XFS_BUF_SET_VTYPE(bp, type)
-#define XFS_BUF_SET_REF(bp, ref)
-
-#define XFS_BUF_ISPINNED(bp)	pagebuf_ispin(bp)
-
-#define XFS_BUF_VALUSEMA(bp)	pagebuf_lock_value(bp)
-#define XFS_BUF_CPSEMA(bp)	(pagebuf_cond_lock(bp) == 0)
-#define XFS_BUF_VSEMA(bp)	pagebuf_unlock(bp)
-#define XFS_BUF_PSEMA(bp,x)	pagebuf_lock(bp)
-#define XFS_BUF_V_IODONESEMA(bp) up(&bp->pb_iodonesema);
-
-/* setup the buffer target from a buftarg structure */
-#define XFS_BUF_SET_TARGET(bp, target)	\
-		(bp)->pb_target = (target)
-#define XFS_BUF_TARGET(bp)	((bp)->pb_target)
-#define XFS_BUFTARG_NAME(target)	\
-		pagebuf_target_name(target)
-
-#define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
-#define XFS_BUF_SET_VTYPE(bp, type)
-#define XFS_BUF_SET_REF(bp, ref)
-
-static inline int	xfs_bawrite(void *mp, xfs_buf_t *bp)
+#define XFS_BUF_MANAGE		XBF_FS_MANAGED
+#define XFS_BUF_UNMANAGE(bp)	((bp)->b_flags &= ~XBF_FS_MANAGED)
+
+#define XFS_BUF_DELAYWRITE(bp)		((bp)->b_flags |= XBF_DELWRI)
+#define XFS_BUF_UNDELAYWRITE(bp)	xfs_buf_delwri_dequeue(bp)
+#define XFS_BUF_ISDELAYWRITE(bp)	((bp)->b_flags & XBF_DELWRI)
+
+#define XFS_BUF_ERROR(bp,no)	xfs_buf_ioerror(bp,no)
+#define XFS_BUF_GETERROR(bp)	xfs_buf_geterror(bp)
+#define XFS_BUF_ISERROR(bp)	(xfs_buf_geterror(bp) ? 1 : 0)
+
+#define XFS_BUF_DONE(bp)	((bp)->b_flags |= XBF_DONE)
+#define XFS_BUF_UNDONE(bp)	((bp)->b_flags &= ~XBF_DONE)
+#define XFS_BUF_ISDONE(bp)	((bp)->b_flags & XBF_DONE)
+
+#define XFS_BUF_BUSY(bp)	do { } while (0)
+#define XFS_BUF_UNBUSY(bp)	do { } while (0)
+#define XFS_BUF_ISBUSY(bp)	(1)
+
+#define XFS_BUF_ASYNC(bp)	((bp)->b_flags |= XBF_ASYNC)
+#define XFS_BUF_UNASYNC(bp)	((bp)->b_flags &= ~XBF_ASYNC)
+#define XFS_BUF_ISASYNC(bp)	((bp)->b_flags & XBF_ASYNC)
+
+#define XFS_BUF_ORDERED(bp)	((bp)->b_flags |= XBF_ORDERED)
+#define XFS_BUF_UNORDERED(bp)	((bp)->b_flags &= ~XBF_ORDERED)
+#define XFS_BUF_ISORDERED(bp)	((bp)->b_flags & XBF_ORDERED)
+
+#define XFS_BUF_SHUT(bp)	do { } while (0)
+#define XFS_BUF_UNSHUT(bp)	do { } while (0)
+#define XFS_BUF_ISSHUT(bp)	(0)
+
+#define XFS_BUF_HOLD(bp)	xfs_buf_hold(bp)
+#define XFS_BUF_READ(bp)	((bp)->b_flags |= XBF_READ)
+#define XFS_BUF_UNREAD(bp)	((bp)->b_flags &= ~XBF_READ)
+#define XFS_BUF_ISREAD(bp)	((bp)->b_flags & XBF_READ)
+
+#define XFS_BUF_WRITE(bp)	((bp)->b_flags |= XBF_WRITE)
+#define XFS_BUF_UNWRITE(bp)	((bp)->b_flags &= ~XBF_WRITE)
+#define XFS_BUF_ISWRITE(bp)	((bp)->b_flags & XBF_WRITE)
+
+#define XFS_BUF_ISUNINITIAL(bp)	(0)
+#define XFS_BUF_UNUNINITIAL(bp)	(0)
+
+#define XFS_BUF_BP_ISMAPPED(bp)	(1)
+
+#define XFS_BUF_IODONE_FUNC(bp)			((bp)->b_iodone)
+#define XFS_BUF_SET_IODONE_FUNC(bp, func)	((bp)->b_iodone = (func))
+#define XFS_BUF_CLR_IODONE_FUNC(bp)		((bp)->b_iodone = NULL)
+#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func)	((bp)->b_strat = (func))
+#define XFS_BUF_CLR_BDSTRAT_FUNC(bp)		((bp)->b_strat = NULL)
+
+#define XFS_BUF_FSPRIVATE(bp, type)		((type)(bp)->b_fspriv)
+#define XFS_BUF_SET_FSPRIVATE(bp, val)		((bp)->b_fspriv = (void*)(val))
+#define XFS_BUF_FSPRIVATE2(bp, type)		((type)(bp)->b_fspriv2)
+#define XFS_BUF_SET_FSPRIVATE2(bp, val)		((bp)->b_fspriv2 = (void*)(val))
+#define XFS_BUF_FSPRIVATE3(bp, type)		((type)(bp)->b_fspriv3)
+#define XFS_BUF_SET_FSPRIVATE3(bp, val)		((bp)->b_fspriv3 = (void*)(val))
+#define XFS_BUF_SET_START(bp)			do { } while (0)
+#define XFS_BUF_SET_BRELSE_FUNC(bp, func)	((bp)->b_relse = (func))
+
+#define XFS_BUF_PTR(bp)			(xfs_caddr_t)((bp)->b_addr)
+#define XFS_BUF_SET_PTR(bp, val, cnt)	xfs_buf_associate_memory(bp, val, cnt)
+#define XFS_BUF_ADDR(bp)		((bp)->b_bn)
+#define XFS_BUF_SET_ADDR(bp, bno)	((bp)->b_bn = (xfs_daddr_t)(bno))
+#define XFS_BUF_OFFSET(bp)		((bp)->b_file_offset)
+#define XFS_BUF_SET_OFFSET(bp, off)	((bp)->b_file_offset = (off))
+#define XFS_BUF_COUNT(bp)		((bp)->b_count_desired)
+#define XFS_BUF_SET_COUNT(bp, cnt)	((bp)->b_count_desired = (cnt))
+#define XFS_BUF_SIZE(bp)		((bp)->b_buffer_length)
+#define XFS_BUF_SET_SIZE(bp, cnt)	((bp)->b_buffer_length = (cnt))
+
+#define XFS_BUF_SET_VTYPE_REF(bp, type, ref)	do { } while (0)
+#define XFS_BUF_SET_VTYPE(bp, type)		do { } while (0)
+#define XFS_BUF_SET_REF(bp, ref)		do { } while (0)
+
+#define XFS_BUF_ISPINNED(bp)	xfs_buf_ispin(bp)
+
+#define XFS_BUF_VALUSEMA(bp)	xfs_buf_lock_value(bp)
+#define XFS_BUF_CPSEMA(bp)	(xfs_buf_cond_lock(bp) == 0)
+#define XFS_BUF_VSEMA(bp)	xfs_buf_unlock(bp)
+#define XFS_BUF_PSEMA(bp,x)	xfs_buf_lock(bp)
+#define XFS_BUF_V_IODONESEMA(bp) up(&bp->b_iodonesema);
+
+#define XFS_BUF_SET_TARGET(bp, target)	((bp)->b_target = (target))
+#define XFS_BUF_TARGET(bp)		((bp)->b_target)
+#define XFS_BUFTARG_NAME(target)	xfs_buf_target_name(target)
+
+static inline int xfs_bawrite(void *mp, xfs_buf_t *bp)
 {
-	bp->pb_fspriv3 = mp;
-	bp->pb_strat = xfs_bdstrat_cb;
-	pagebuf_delwri_dequeue(bp);
-	return pagebuf_iostart(bp, PBF_WRITE | PBF_ASYNC | _PBF_RUN_QUEUES);
+	bp->b_fspriv3 = mp;
+	bp->b_strat = xfs_bdstrat_cb;
+	xfs_buf_delwri_dequeue(bp);
+	return xfs_buf_iostart(bp, XBF_WRITE | XBF_ASYNC | _XBF_RUN_QUEUES);
 }
 
-static inline void	xfs_buf_relse(xfs_buf_t *bp)
+static inline void xfs_buf_relse(xfs_buf_t *bp)
 {
-	if (!bp->pb_relse)
-		pagebuf_unlock(bp);
-	pagebuf_rele(bp);
+	if (!bp->b_relse)
+		xfs_buf_unlock(bp);
+	xfs_buf_rele(bp);
 }
 
-#define xfs_bpin(bp)		pagebuf_pin(bp)
-#define xfs_bunpin(bp)		pagebuf_unpin(bp)
+#define xfs_bpin(bp)		xfs_buf_pin(bp)
+#define xfs_bunpin(bp)		xfs_buf_unpin(bp)
 
 #define xfs_buftrace(id, bp)	\
-	    pagebuf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
+	    xfs_buf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
 
-#define xfs_biodone(pb)		    \
-	    pagebuf_iodone(pb, 0)
+#define xfs_biodone(bp)		xfs_buf_ioend(bp, 0)
 
-#define xfs_biomove(pb, off, len, data, rw) \
-	    pagebuf_iomove((pb), (off), (len), (data), \
-		((rw) == XFS_B_WRITE) ? PBRW_WRITE : PBRW_READ)
+#define xfs_biomove(bp, off, len, data, rw) \
+	    xfs_buf_iomove((bp), (off), (len), (data), \
+		((rw) == XFS_B_WRITE) ? XBRW_WRITE : XBRW_READ)
 
-#define xfs_biozero(pb, off, len) \
-	    pagebuf_iomove((pb), (off), (len), NULL, PBRW_ZERO)
+#define xfs_biozero(bp, off, len) \
+	    xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
 
 
-static inline int	XFS_bwrite(xfs_buf_t *pb)
+static inline int XFS_bwrite(xfs_buf_t *bp)
 {
-	int	iowait = (pb->pb_flags & PBF_ASYNC) == 0;
+	int	iowait = (bp->b_flags & XBF_ASYNC) == 0;
 	int	error = 0;
 
 	if (!iowait)
-		pb->pb_flags |= _PBF_RUN_QUEUES;
+		bp->b_flags |= _XBF_RUN_QUEUES;
 
-	pagebuf_delwri_dequeue(pb);
-	pagebuf_iostrategy(pb);
+	xfs_buf_delwri_dequeue(bp);
+	xfs_buf_iostrategy(bp);
 	if (iowait) {
-		error = pagebuf_iowait(pb);
-		xfs_buf_relse(pb);
+		error = xfs_buf_iowait(bp);
+		xfs_buf_relse(bp);
 	}
 	return error;
 }
 
-#define XFS_bdwrite(pb)		     \
-	    pagebuf_iostart(pb, PBF_DELWRI | PBF_ASYNC)
+#define XFS_bdwrite(bp)		xfs_buf_iostart(bp, XBF_DELWRI | XBF_ASYNC)
 
 static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
 {
-	bp->pb_strat = xfs_bdstrat_cb;
-	bp->pb_fspriv3 = mp;
-
-	return pagebuf_iostart(bp, PBF_DELWRI | PBF_ASYNC);
+	bp->b_strat = xfs_bdstrat_cb;
+	bp->b_fspriv3 = mp;
+	return xfs_buf_iostart(bp, XBF_DELWRI | XBF_ASYNC);
 }
 
-#define XFS_bdstrat(bp) pagebuf_iorequest(bp)
+#define XFS_bdstrat(bp) xfs_buf_iorequest(bp)
 
-#define xfs_iowait(pb)	pagebuf_iowait(pb)
+#define xfs_iowait(bp)	xfs_buf_iowait(bp)
 
 #define xfs_baread(target, rablkno, ralen)  \
-	pagebuf_readahead((target), (rablkno), (ralen), PBF_DONT_BLOCK)
-
-#define xfs_buf_get_empty(len, target)	pagebuf_get_empty((len), (target))
-#define xfs_buf_get_noaddr(len, target)	pagebuf_get_no_daddr((len), (target))
-#define xfs_buf_free(bp)		pagebuf_free(bp)
+	xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK)
 
 
 /*
  *	Handling of buftargs.
  */
-
 extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int);
 extern void xfs_free_buftarg(xfs_buftarg_t *, int);
 extern void xfs_wait_buftarg(xfs_buftarg_t *);
 extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
 extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
 
-#define xfs_getsize_buftarg(buftarg) \
-	block_size((buftarg)->pbr_bdev)
-#define xfs_readonly_buftarg(buftarg) \
-	bdev_read_only((buftarg)->pbr_bdev)
-#define xfs_binval(buftarg) \
-	xfs_flush_buftarg(buftarg, 1)
-#define XFS_bflush(buftarg) \
-	xfs_flush_buftarg(buftarg, 1)
+#define xfs_getsize_buftarg(buftarg)	block_size((buftarg)->bt_bdev)
+#define xfs_readonly_buftarg(buftarg)	bdev_read_only((buftarg)->bt_bdev)
+
+#define xfs_binval(buftarg)		xfs_flush_buftarg(buftarg, 1)
+#define XFS_bflush(buftarg)		xfs_flush_buftarg(buftarg, 1)
 
 #endif	/* __XFS_BUF_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index 06111d0bbae4..ced4404339c7 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -509,16 +509,14 @@ linvfs_open_exec(
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
 	int		error = 0;
-	bhv_desc_t	*bdp;
 	xfs_inode_t	*ip;
 
 	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
-		bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
-		if (!bdp) {
+		ip = xfs_vtoi(vp);
+		if (!ip) {
 			error = -EINVAL;
 			goto open_exec_out;
 		}
-		ip = XFS_BHVTOI(bdp);
 		if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) {
 			error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
 					       0, 0, 0, NULL);
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index 21667ba6dcd5..4db47790415c 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -146,13 +146,10 @@ xfs_find_handle(
 
 	if (cmd != XFS_IOC_PATH_TO_FSHANDLE) {
 		xfs_inode_t	*ip;
-		bhv_desc_t	*bhv;
 		int		lock_mode;
 
 		/* need to get access to the xfs_inode to read the generation */
-		bhv = vn_bhv_lookup_unlocked(VN_BHV_HEAD(vp), &xfs_vnodeops);
-		ASSERT(bhv);
-		ip = XFS_BHVTOI(bhv);
+		ip = xfs_vtoi(vp);
 		ASSERT(ip);
 		lock_mode = xfs_ilock_map_shared(ip);
 
@@ -751,9 +748,8 @@ xfs_ioctl(
 			(ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
 			mp->m_rtdev_targp : mp->m_ddev_targp;
 
-		da.d_mem = da.d_miniosz = 1 << target->pbr_sshift;
-		/* The size dio will do in one go */
-		da.d_maxiosz = 64 * PAGE_CACHE_SIZE;
+		da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
+		da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
 
 		if (copy_to_user(arg, &da, sizeof(da)))
 			return -XFS_ERROR(EFAULT);
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 9b8ee3470ecc..4bd3d03b23ed 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -54,11 +54,46 @@
 #include <linux/capability.h>
 #include <linux/xattr.h>
 #include <linux/namei.h>
+#include <linux/security.h>
 
 #define IS_NOATIME(inode) ((inode->i_sb->s_flags & MS_NOATIME) ||	\
 	(S_ISDIR(inode->i_mode) && inode->i_sb->s_flags & MS_NODIRATIME))
 
 /*
+ * Get a XFS inode from a given vnode.
+ */
+xfs_inode_t *
+xfs_vtoi(
+	struct vnode	*vp)
+{
+	bhv_desc_t      *bdp;
+
+	bdp = bhv_lookup_range(VN_BHV_HEAD(vp),
+			VNODE_POSITION_XFS, VNODE_POSITION_XFS);
+	if (unlikely(bdp == NULL))
+		return NULL;
+	return XFS_BHVTOI(bdp);
+}
+
+/*
+ * Bring the atime in the XFS inode uptodate.
+ * Used before logging the inode to disk or when the Linux inode goes away.
+ */
+void
+xfs_synchronize_atime(
+	xfs_inode_t	*ip)
+{
+	vnode_t		*vp;
+
+	vp = XFS_ITOV_NULL(ip);
+	if (vp) {
+		struct inode *inode = &vp->v_inode;
+		ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
+		ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
+	}
+}
+
+/*
  * Change the requested timestamp in the given inode.
  * We don't lock across timestamp updates, and we don't log them but
  * we do record the fact that there is dirty information in core.
@@ -77,23 +112,6 @@ xfs_ichgtime(
 	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));
 	timespec_t	tv;
 
-	/*
-	 * We're not supposed to change timestamps in readonly-mounted
-	 * filesystems.  Throw it away if anyone asks us.
-	 */
-	if (unlikely(IS_RDONLY(inode)))
-		return;
-
-	/*
-	 * Don't update access timestamps on reads if mounted "noatime".
-	 * Throw it away if anyone asks us.
-	 */
-	if (unlikely(
-	    (ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) &&
-	    (flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG)) ==
-			XFS_ICHGTIME_ACC))
-		return;
-
 	nanotime(&tv);
 	if (flags & XFS_ICHGTIME_MOD) {
 		inode->i_mtime = tv;
@@ -130,8 +148,6 @@ xfs_ichgtime(
  * Variant on the above which avoids querying the system clock
  * in situations where we know the Linux inode timestamps have
  * just been updated (and so we can update our inode cheaply).
- * We also skip the readonly and noatime checks here, they are
- * also catered for already.
  */
 void
 xfs_ichgtime_fast(
@@ -142,20 +158,16 @@ xfs_ichgtime_fast(
 	timespec_t	*tvp;
 
 	/*
-	 * We're not supposed to change timestamps in readonly-mounted
-	 * filesystems.  Throw it away if anyone asks us.
+	 * Atime updates for read() & friends are handled lazily now, and
+	 * explicit updates must go through xfs_ichgtime()
 	 */
-	if (unlikely(IS_RDONLY(inode)))
-		return;
+	ASSERT((flags & XFS_ICHGTIME_ACC) == 0);
 
 	/*
-	 * Don't update access timestamps on reads if mounted "noatime".
-	 * Throw it away if anyone asks us.
+	 * We're not supposed to change timestamps in readonly-mounted
+	 * filesystems.  Throw it away if anyone asks us.
 	 */
-	if (unlikely(
-	    (ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) &&
-	    ((flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG)) ==
-			XFS_ICHGTIME_ACC)))
+	if (unlikely(IS_RDONLY(inode)))
 		return;
 
 	if (flags & XFS_ICHGTIME_MOD) {
@@ -163,11 +175,6 @@ xfs_ichgtime_fast(
 		ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
 		ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec;
 	}
-	if (flags & XFS_ICHGTIME_ACC) {
-		tvp = &inode->i_atime;
-		ip->i_d.di_atime.t_sec = (__int32_t)tvp->tv_sec;
-		ip->i_d.di_atime.t_nsec = (__int32_t)tvp->tv_nsec;
-	}
 	if (flags & XFS_ICHGTIME_CHG) {
 		tvp = &inode->i_ctime;
 		ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec;
@@ -214,6 +221,39 @@ validate_fields(
 }
 
 /*
+ * Hook in SELinux.  This is not quite correct yet, what we really need
+ * here (as we do for default ACLs) is a mechanism by which creation of
+ * these attrs can be journalled at inode creation time (along with the
+ * inode, of course, such that log replay can't cause these to be lost).
+ */
+STATIC int
+linvfs_init_security(
+	struct vnode	*vp,
+	struct inode	*dir)
+{
+	struct inode	*ip = LINVFS_GET_IP(vp);
+	size_t		length;
+	void		*value;
+	char		*name;
+	int		error;
+
+	error = security_inode_init_security(ip, dir, &name, &value, &length);
+	if (error) {
+		if (error == -EOPNOTSUPP)
+			return 0;
+		return -error;
+	}
+
+	VOP_ATTR_SET(vp, name, value, length, ATTR_SECURE, NULL, error);
+	if (!error)
+		VMODIFY(vp);
+
+	kfree(name);
+	kfree(value);
+	return error;
+}
+
+/*
  * Determine whether a process has a valid fs_struct (kernel daemons
  * like knfsd don't have an fs_struct).
  *
@@ -278,6 +318,9 @@ linvfs_mknod(
 		break;
 	}
 
+	if (!error)
+		error = linvfs_init_security(vp, dir);
+
 	if (default_acl) {
 		if (!error) {
 			error = _ACL_INHERIT(vp, &va, default_acl);
@@ -294,8 +337,6 @@ linvfs_mknod(
 				teardown.d_inode = ip = LINVFS_GET_IP(vp);
 				teardown.d_name = dentry->d_name;
 
-				vn_mark_bad(vp);
-				
 				if (S_ISDIR(mode))
 					VOP_RMDIR(dvp, &teardown, NULL, err2);
 				else
@@ -506,7 +547,7 @@ linvfs_follow_link(
 	ASSERT(dentry);
 	ASSERT(nd);
 
-	link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
+	link = (char *)kmalloc(MAXPATHLEN+1, GFP_KERNEL);
 	if (!link) {
 		nd_set_link(nd, ERR_PTR(-ENOMEM));
 		return NULL;
@@ -522,12 +563,12 @@ linvfs_follow_link(
 	vp = LINVFS_GET_VP(dentry->d_inode);
 
 	iov.iov_base = link;
-	iov.iov_len = MAXNAMELEN;
+	iov.iov_len = MAXPATHLEN;
 
 	uio->uio_iov = &iov;
 	uio->uio_offset = 0;
 	uio->uio_segflg = UIO_SYSSPACE;
-	uio->uio_resid = MAXNAMELEN;
+	uio->uio_resid = MAXPATHLEN;
 	uio->uio_iovcnt = 1;
 
 	VOP_READLINK(vp, uio, 0, NULL, error);
@@ -535,7 +576,7 @@ linvfs_follow_link(
 		kfree(link);
 		link = ERR_PTR(-error);
 	} else {
-		link[MAXNAMELEN - uio->uio_resid] = '\0';
+		link[MAXPATHLEN - uio->uio_resid] = '\0';
 	}
 	kfree(uio);
 
diff --git a/fs/xfs/linux-2.6/xfs_iops.h b/fs/xfs/linux-2.6/xfs_iops.h
index ee784b63acbf..6899a6b4a50a 100644
--- a/fs/xfs/linux-2.6/xfs_iops.h
+++ b/fs/xfs/linux-2.6/xfs_iops.h
@@ -26,11 +26,6 @@ extern struct file_operations linvfs_file_operations;
 extern struct file_operations linvfs_invis_file_operations;
 extern struct file_operations linvfs_dir_operations;
 
-extern struct address_space_operations linvfs_aops;
-
-extern int linvfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
-extern void linvfs_unwritten_done(struct buffer_head *, int);
-
 extern int xfs_ioctl(struct bhv_desc *, struct inode *, struct file *,
                         int, unsigned int, void __user *);
 
diff --git a/fs/xfs/linux-2.6/xfs_linux.h b/fs/xfs/linux-2.6/xfs_linux.h
index d8e21ba0cccc..67389b745526 100644
--- a/fs/xfs/linux-2.6/xfs_linux.h
+++ b/fs/xfs/linux-2.6/xfs_linux.h
@@ -110,10 +110,6 @@
  * delalloc and these ondisk-uninitialised buffers.
  */
 BUFFER_FNS(PrivateStart, unwritten);
-static inline void set_buffer_unwritten_io(struct buffer_head *bh)
-{
-	bh->b_end_io = linvfs_unwritten_done;
-}
 
 #define restricted_chown	xfs_params.restrict_chown.val
 #define irix_sgid_inherit	xfs_params.sgid_inherit.val
@@ -232,7 +228,7 @@ static inline void set_buffer_unwritten_io(struct buffer_head *bh)
 #define xfs_itruncate_data(ip, off)	\
 	(-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
 #define xfs_statvfs_fsid(statp, mp)	\
-	({ u64 id = huge_encode_dev((mp)->m_dev);	\
+	({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
 	   __kernel_fsid_t *fsid = &(statp)->f_fsid;	\
 	(fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
 
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 885dfafeabee..e0ab45fbfebd 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -233,8 +233,8 @@ xfs_read(
 		xfs_buftarg_t	*target =
 			(ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
 				mp->m_rtdev_targp : mp->m_ddev_targp;
-		if ((*offset & target->pbr_smask) ||
-		    (size & target->pbr_smask)) {
+		if ((*offset & target->bt_smask) ||
+		    (size & target->bt_smask)) {
 			if (*offset == ip->i_d.di_size) {
 				return (0);
 			}
@@ -281,9 +281,6 @@ xfs_read(
 
 	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
 
-	if (likely(!(ioflags & IO_INVIS)))
-		xfs_ichgtime_fast(ip, inode, XFS_ICHGTIME_ACC);
-
 unlock_isem:
 	if (unlikely(ioflags & IO_ISDIRECT))
 		mutex_unlock(&inode->i_mutex);
@@ -346,9 +343,6 @@ xfs_sendfile(
 	if (ret > 0)
 		XFS_STATS_ADD(xs_read_bytes, ret);
 
-	if (likely(!(ioflags & IO_INVIS)))
-		xfs_ichgtime_fast(ip, LINVFS_GET_IP(vp), XFS_ICHGTIME_ACC);
-
 	return ret;
 }
 
@@ -362,7 +356,6 @@ STATIC int				/* error (positive) */
 xfs_zero_last_block(
 	struct inode	*ip,
 	xfs_iocore_t	*io,
-	xfs_off_t	offset,
 	xfs_fsize_t	isize,
 	xfs_fsize_t	end_size)
 {
@@ -371,19 +364,16 @@ xfs_zero_last_block(
 	int		nimaps;
 	int		zero_offset;
 	int		zero_len;
-	int		isize_fsb_offset;
 	int		error = 0;
 	xfs_bmbt_irec_t	imap;
 	loff_t		loff;
-	size_t		lsize;
 
 	ASSERT(ismrlocked(io->io_lock, MR_UPDATE) != 0);
-	ASSERT(offset > isize);
 
 	mp = io->io_mount;
 
-	isize_fsb_offset = XFS_B_FSB_OFFSET(mp, isize);
-	if (isize_fsb_offset == 0) {
+	zero_offset = XFS_B_FSB_OFFSET(mp, isize);
+	if (zero_offset == 0) {
 		/*
 		 * There are no extra bytes in the last block on disk to
 		 * zero, so return.
@@ -413,10 +403,8 @@ xfs_zero_last_block(
 	 */
 	XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL| XFS_EXTSIZE_RD);
 	loff = XFS_FSB_TO_B(mp, last_fsb);
-	lsize = XFS_FSB_TO_B(mp, 1);
 
-	zero_offset = isize_fsb_offset;
-	zero_len = mp->m_sb.sb_blocksize - isize_fsb_offset;
+	zero_len = mp->m_sb.sb_blocksize - zero_offset;
 
 	error = xfs_iozero(ip, loff + zero_offset, zero_len, end_size);
 
@@ -447,20 +435,17 @@ xfs_zero_eof(
 	struct inode	*ip = LINVFS_GET_IP(vp);
 	xfs_fileoff_t	start_zero_fsb;
 	xfs_fileoff_t	end_zero_fsb;
-	xfs_fileoff_t	prev_zero_fsb;
 	xfs_fileoff_t	zero_count_fsb;
 	xfs_fileoff_t	last_fsb;
 	xfs_extlen_t	buf_len_fsb;
-	xfs_extlen_t	prev_zero_count;
 	xfs_mount_t	*mp;
 	int		nimaps;
 	int		error = 0;
 	xfs_bmbt_irec_t	imap;
-	loff_t		loff;
-	size_t		lsize;
 
 	ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
 	ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
+	ASSERT(offset > isize);
 
 	mp = io->io_mount;
 
@@ -468,7 +453,7 @@ xfs_zero_eof(
 	 * First handle zeroing the block on which isize resides.
 	 * We only zero a part of that block so it is handled specially.
 	 */
-	error = xfs_zero_last_block(ip, io, offset, isize, end_size);
+	error = xfs_zero_last_block(ip, io, isize, end_size);
 	if (error) {
 		ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
 		ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
@@ -496,8 +481,6 @@ xfs_zero_eof(
 	}
 
 	ASSERT(start_zero_fsb <= end_zero_fsb);
-	prev_zero_fsb = NULLFILEOFF;
-	prev_zero_count = 0;
 	while (start_zero_fsb <= end_zero_fsb) {
 		nimaps = 1;
 		zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
@@ -519,10 +502,7 @@ xfs_zero_eof(
 			 * that sits on a hole and sets the page as P_HOLE
 			 * and calls remapf if it is a mapped file.
 			 */
-			prev_zero_fsb = NULLFILEOFF;
-			prev_zero_count = 0;
-			start_zero_fsb = imap.br_startoff +
-					 imap.br_blockcount;
+			start_zero_fsb = imap.br_startoff + imap.br_blockcount;
 			ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
 			continue;
 		}
@@ -543,17 +523,15 @@ xfs_zero_eof(
 		 */
 		XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
 
-		loff = XFS_FSB_TO_B(mp, start_zero_fsb);
-		lsize = XFS_FSB_TO_B(mp, buf_len_fsb);
-
-		error = xfs_iozero(ip, loff, lsize, end_size);
+		error = xfs_iozero(ip,
+				   XFS_FSB_TO_B(mp, start_zero_fsb),
+				   XFS_FSB_TO_B(mp, buf_len_fsb),
+				   end_size);
 
 		if (error) {
 			goto out_lock;
 		}
 
-		prev_zero_fsb = start_zero_fsb;
-		prev_zero_count = buf_len_fsb;
 		start_zero_fsb = imap.br_startoff + buf_len_fsb;
 		ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
 
@@ -640,7 +618,7 @@ xfs_write(
 			(xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
 				mp->m_rtdev_targp : mp->m_ddev_targp;
 
-		if ((pos & target->pbr_smask) || (count & target->pbr_smask))
+		if ((pos & target->bt_smask) || (count & target->bt_smask))
 			return XFS_ERROR(-EINVAL);
 
 		if (!VN_CACHED(vp) && pos < i_size_read(inode))
@@ -831,6 +809,10 @@ retry:
 		goto retry;
 	}
 
+	isize = i_size_read(inode);
+	if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
+		*offset = isize;
+
 	if (*offset > xip->i_d.di_size) {
 		xfs_ilock(xip, XFS_ILOCK_EXCL);
 		if (*offset > xip->i_d.di_size) {
@@ -956,7 +938,7 @@ xfs_bdstrat_cb(struct xfs_buf *bp)
 
 	mp = XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *);
 	if (!XFS_FORCED_SHUTDOWN(mp)) {
-		pagebuf_iorequest(bp);
+		xfs_buf_iorequest(bp);
 		return 0;
 	} else {
 		xfs_buftrace("XFS__BDSTRAT IOERROR", bp);
@@ -1009,7 +991,7 @@ xfsbdstrat(
 		 * if (XFS_BUF_IS_GRIO(bp)) {
 		 */
 
-		pagebuf_iorequest(bp);
+		xfs_buf_iorequest(bp);
 		return 0;
 	}
 
diff --git a/fs/xfs/linux-2.6/xfs_stats.c b/fs/xfs/linux-2.6/xfs_stats.c
index 6c40a74be7c8..8955720a2c6b 100644
--- a/fs/xfs/linux-2.6/xfs_stats.c
+++ b/fs/xfs/linux-2.6/xfs_stats.c
@@ -34,7 +34,7 @@ xfs_read_xfsstats(
 	__uint64_t	xs_write_bytes = 0;
 	__uint64_t	xs_read_bytes = 0;
 
-	static struct xstats_entry {
+	static const struct xstats_entry {
 		char	*desc;
 		int	endpoint;
 	} xstats[] = {
diff --git a/fs/xfs/linux-2.6/xfs_stats.h b/fs/xfs/linux-2.6/xfs_stats.h
index 50027c4a5618..8ba7a2fa6c1d 100644
--- a/fs/xfs/linux-2.6/xfs_stats.h
+++ b/fs/xfs/linux-2.6/xfs_stats.h
@@ -109,15 +109,15 @@ struct xfsstats {
 	__uint32_t		vn_remove;	/* # times vn_remove called */
 	__uint32_t		vn_free;	/* # times vn_free called */
 #define XFSSTAT_END_BUF			(XFSSTAT_END_VNODE_OPS+9)
-	__uint32_t		pb_get;
-	__uint32_t		pb_create;
-	__uint32_t		pb_get_locked;
-	__uint32_t		pb_get_locked_waited;
-	__uint32_t		pb_busy_locked;
-	__uint32_t		pb_miss_locked;
-	__uint32_t		pb_page_retries;
-	__uint32_t		pb_page_found;
-	__uint32_t		pb_get_read;
+	__uint32_t		xb_get;
+	__uint32_t		xb_create;
+	__uint32_t		xb_get_locked;
+	__uint32_t		xb_get_locked_waited;
+	__uint32_t		xb_busy_locked;
+	__uint32_t		xb_miss_locked;
+	__uint32_t		xb_page_retries;
+	__uint32_t		xb_page_found;
+	__uint32_t		xb_get_read;
 /* Extra precision counters */
 	__uint64_t		xs_xstrat_bytes;
 	__uint64_t		xs_write_bytes;
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 6116b5bf433e..f22e426d9e42 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -306,13 +306,15 @@ xfs_mountfs_check_barriers(xfs_mount_t *mp)
 		xfs_fs_cmn_err(CE_NOTE, mp,
 		  "Disabling barriers, not supported with external log device");
 		mp->m_flags &= ~XFS_MOUNT_BARRIER;
+		return;
 	}
 
-	if (mp->m_ddev_targp->pbr_bdev->bd_disk->queue->ordered ==
+	if (mp->m_ddev_targp->bt_bdev->bd_disk->queue->ordered ==
 					QUEUE_ORDERED_NONE) {
 		xfs_fs_cmn_err(CE_NOTE, mp,
 		  "Disabling barriers, not supported by the underlying device");
 		mp->m_flags &= ~XFS_MOUNT_BARRIER;
+		return;
 	}
 
 	error = xfs_barrier_test(mp);
@@ -320,6 +322,7 @@ xfs_mountfs_check_barriers(xfs_mount_t *mp)
 		xfs_fs_cmn_err(CE_NOTE, mp,
 		  "Disabling barriers, trial barrier write failed");
 		mp->m_flags &= ~XFS_MOUNT_BARRIER;
+		return;
 	}
 }
 
@@ -327,7 +330,7 @@ void
 xfs_blkdev_issue_flush(
 	xfs_buftarg_t		*buftarg)
 {
-	blkdev_issue_flush(buftarg->pbr_bdev, NULL);
+	blkdev_issue_flush(buftarg->bt_bdev, NULL);
 }
 
 STATIC struct inode *
@@ -576,7 +579,7 @@ xfssyncd(
 		timeleft = schedule_timeout_interruptible(timeleft);
 		/* swsusp */
 		try_to_freeze();
-		if (kthread_should_stop())
+		if (kthread_should_stop() && list_empty(&vfsp->vfs_sync_list))
 			break;
 
 		spin_lock(&vfsp->vfs_sync_lock);
@@ -966,9 +969,9 @@ init_xfs_fs( void )
 	if (error < 0)
 		goto undo_zones;
 
-	error = pagebuf_init();
+	error = xfs_buf_init();
 	if (error < 0)
-		goto undo_pagebuf;
+		goto undo_buffers;
 
 	vn_init();
 	xfs_init();
@@ -982,9 +985,9 @@ init_xfs_fs( void )
 	return 0;
 
 undo_register:
-	pagebuf_terminate();
+	xfs_buf_terminate();
 
-undo_pagebuf:
+undo_buffers:
 	linvfs_destroy_zones();
 
 undo_zones:
@@ -998,7 +1001,7 @@ exit_xfs_fs( void )
 	XFS_DM_EXIT(&xfs_fs_type);
 	unregister_filesystem(&xfs_fs_type);
 	xfs_cleanup();
-	pagebuf_terminate();
+	xfs_buf_terminate();
 	linvfs_destroy_zones();
 	ktrace_uninit();
 }
diff --git a/fs/xfs/linux-2.6/xfs_vnode.c b/fs/xfs/linux-2.6/xfs_vnode.c
index e9bbcb4d6243..260dd8415dd7 100644
--- a/fs/xfs/linux-2.6/xfs_vnode.c
+++ b/fs/xfs/linux-2.6/xfs_vnode.c
@@ -106,7 +106,6 @@ vn_revalidate_core(
 	inode->i_blocks	    = vap->va_nblocks;
 	inode->i_mtime	    = vap->va_mtime;
 	inode->i_ctime	    = vap->va_ctime;
-	inode->i_atime	    = vap->va_atime;
 	inode->i_blksize    = vap->va_blocksize;
 	if (vap->va_xflags & XFS_XFLAG_IMMUTABLE)
 		inode->i_flags |= S_IMMUTABLE;
diff --git a/fs/xfs/linux-2.6/xfs_vnode.h b/fs/xfs/linux-2.6/xfs_vnode.h
index f2bbb327c081..0fe2419461d6 100644
--- a/fs/xfs/linux-2.6/xfs_vnode.h
+++ b/fs/xfs/linux-2.6/xfs_vnode.h
@@ -566,6 +566,25 @@ static inline int VN_BAD(struct vnode *vp)
 }
 
 /*
+ * Extracting atime values in various formats
+ */
+static inline void vn_atime_to_bstime(struct vnode *vp, xfs_bstime_t *bs_atime)
+{
+	bs_atime->tv_sec = vp->v_inode.i_atime.tv_sec;
+	bs_atime->tv_nsec = vp->v_inode.i_atime.tv_nsec;
+}
+
+static inline void vn_atime_to_timespec(struct vnode *vp, struct timespec *ts)
+{
+	*ts = vp->v_inode.i_atime;
+}
+
+static inline void vn_atime_to_time_t(struct vnode *vp, time_t *tt)
+{
+	*tt = vp->v_inode.i_atime.tv_sec;
+}
+
+/*
  * Some useful predicates.
  */
 #define VN_MAPPED(vp)	mapping_mapped(LINVFS_GET_IP(vp)->i_mapping)