X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fgfs2%2Fbmap.c;h=0db0cd92a38d92f7dcf882c2d942b037c632da17;hb=1a0eae8848cde6e0734360f6456496c995ee1e23;hp=f570d8caef6893ca7db83eb760469c82db2ed22b;hpb=08bc2dbc7327e89b9d5b9c8ef9401d1df2622fca;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index f570d8c..0db0cd9 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1,46 +1,44 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License v.2.
+ * of the GNU General Public License version 2.
  */
 
-#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/completion.h>
 #include <linux/buffer_head.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/crc32.h>
-#include <asm/semaphore.h>
 
 #include "gfs2.h"
-#include "lm_interface.h"
 #include "incore.h"
 #include "bmap.h"
 #include "glock.h"
 #include "inode.h"
 #include "meta_io.h"
-#include "page.h"
 #include "quota.h"
 #include "rgrp.h"
 #include "trans.h"
 #include "dir.h"
 #include "util.h"
+#include "trace_gfs2.h"
 
 /* This doesn't need to be that large as max 64 bit pointers in a 4k
  * block is 512, so __u16 is fine for that. It saves stack space to
  * keep it small.
  */
 struct metapath {
+	struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT];
 	__u16 mp_list[GFS2_MAX_META_HEIGHT];
 };
 
 typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh,
-			     struct buffer_head *bh, uint64_t *top,
-			     uint64_t *bottom, unsigned int height,
+			     struct buffer_head *bh, __be64 *top,
+			     __be64 *bottom, unsigned int height,
 			     void *data);
 
 struct strip_mine {
@@ -49,35 +47,65 @@ struct strip_mine {
 };
 
 /**
- * @gfs2_unstuffer_sync - Synchronously unstuff a dinode
- * @ip:
- * @dibh:
- * @block:
- * @private:
- *
- * Cheat and use a metadata buffer instead of a data page.
+ * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
+ * @ip: the inode
+ * @dibh: the dinode buffer
+ * @block: the block number that was allocated
+ * @private: any locked page held by the caller process
  *
  * Returns: errno
  */
-#if 0
-int gfs2_unstuffer_sync(struct gfs2_inode *ip, struct buffer_head *dibh,
-			uint64_t block, void *private)
+
+static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
+			       u64 block, struct page *page)
 {
+	struct inode *inode = &ip->i_inode;
 	struct buffer_head *bh;
-	int error;
+	int release = 0;
 
-	bh = gfs2_meta_new(ip->i_gl, block);
+	if (!page || page->index) {
+		page = grab_cache_page(inode->i_mapping, 0);
+		if (!page)
+			return -ENOMEM;
+		release = 1;
+	}
 
-	gfs2_buffer_copy_tail(bh, 0, dibh, sizeof(struct gfs2_dinode));
+	if (!PageUptodate(page)) {
+		void *kaddr = kmap(page);
+		u64 dsize = i_size_read(inode);
+ 
+		if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
+			dsize = dibh->b_size - sizeof(struct gfs2_dinode);
 
-	set_buffer_dirty(bh);
-	error = sync_dirty_buffer(bh);
+		memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
+		memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
+		kunmap(page);
 
-	brelse(bh);
+		SetPageUptodate(page);
+	}
 
-	return error;
+	if (!page_has_buffers(page))
+		create_empty_buffers(page, 1 << inode->i_blkbits,
+				     (1 << BH_Uptodate));
+
+	bh = page_buffers(page);
+
+	if (!buffer_mapped(bh))
+		map_bh(bh, inode->i_sb, block);
+
+	set_buffer_uptodate(bh);
+	if (!gfs2_is_jdata(ip))
+		mark_buffer_dirty(bh);
+	if (!gfs2_is_writeback(ip))
+		gfs2_trans_add_bh(ip->i_gl, bh, 0);
+
+	if (release) {
+		unlock_page(page);
+		page_cache_release(page);
+	}
+
+	return 0;
 }
-#endif  /*  0  */
 
 /**
  * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
@@ -91,11 +119,11 @@ int gfs2_unstuffer_sync(struct gfs2_inode *ip, struct buffer_head *dibh,
  * Returns: errno
  */
 
-int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
-			void *private)
+int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
 {
 	struct buffer_head *bh, *dibh;
-	uint64_t block = 0;
+	struct gfs2_dinode *di;
+	u64 block = 0;
 	int isdir = gfs2_is_dir(ip);
 	int error;
 
@@ -104,25 +132,25 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
 	error = gfs2_meta_inode_buffer(ip, &dibh);
 	if (error)
 		goto out;
-		
-	if (ip->i_di.di_size) {
+
+	if (ip->i_disksize) {
 		/* Get a free block, fill it with the stuffed data,
 		   and write it out to disk */
 
+		unsigned int n = 1;
+		error = gfs2_alloc_block(ip, &block, &n);
+		if (error)
+			goto out_brelse;
 		if (isdir) {
-			block = gfs2_alloc_meta(ip);
-
+			gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1);
 			error = gfs2_dir_get_new_buffer(ip, block, &bh);
 			if (error)
 				goto out_brelse;
-			gfs2_buffer_copy_tail(bh,
-					      sizeof(struct gfs2_meta_header),
+			gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header),
 					      dibh, sizeof(struct gfs2_dinode));
 			brelse(bh);
 		} else {
-			block = gfs2_alloc_data(ip);
-
-			error = unstuffer(ip, dibh, block, private);
+			error = gfs2_unstuffer_page(ip, dibh, block, page);
 			if (error)
 				goto out_brelse;
 		}
@@ -131,143 +159,32 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
 	/*  Set up the pointer to the new block  */
 
 	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-
+	di = (struct gfs2_dinode *)dibh->b_data;
 	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 
-	if (ip->i_di.di_size) {
-		*(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) =
-			cpu_to_be64(block);
-		ip->i_di.di_blocks++;
+	if (ip->i_disksize) {
+		*(__be64 *)(di + 1) = cpu_to_be64(block);
+		gfs2_add_inode_blocks(&ip->i_inode, 1);
+		di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 	}
 
-	ip->i_di.di_height = 1;
+	ip->i_height = 1;
+	di->di_height = cpu_to_be16(1);
 
-	gfs2_dinode_out(&ip->i_di, dibh->b_data);
-
- out_brelse:
+out_brelse:
 	brelse(dibh);
-
- out:
+out:
 	up_write(&ip->i_rw_mutex);
-
 	return error;
 }
 
-/**
- * calc_tree_height - Calculate the height of a metadata tree
- * @ip: The GFS2 inode
- * @size: The proposed size of the file
- *
- * Work out how tall a metadata tree needs to be in order to accommodate a
- * file of a particular size. If size is less than the current size of
- * the inode, then the current size of the inode is used instead of the
- * supplied one.
- *
- * Returns: the height the tree should be
- */
-
-static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size)
-{
-	struct gfs2_sbd *sdp = ip->i_sbd;
-	uint64_t *arr;
-	unsigned int max, height;
-
-	if (ip->i_di.di_size > size)
-		size = ip->i_di.di_size;
-
-	if (gfs2_is_dir(ip)) {
-		arr = sdp->sd_jheightsize;
-		max = sdp->sd_max_jheight;
-	} else {
-		arr = sdp->sd_heightsize;
-		max = sdp->sd_max_height;
-	}
-
-	for (height = 0; height < max; height++)
-		if (arr[height] >= size)
-			break;
-
-	return height;
-}
-
-/**
- * build_height - Build a metadata tree of the requested height
- * @ip: The GFS2 inode
- * @height: The height to build to
- *
- * This routine makes sure that the metadata tree is tall enough to hold
- * "size" bytes of data.
- *
- * Returns: errno
- */
-
-static int build_height(struct gfs2_inode *ip, int height)
-{
-	struct gfs2_sbd *sdp = ip->i_sbd;
-	struct buffer_head *bh, *dibh;
-	uint64_t block = 0, *bp;
-	unsigned int x;
-	int new_block;
-	int error;
-
-	while (ip->i_di.di_height < height) {
-		error = gfs2_meta_inode_buffer(ip, &dibh);
-		if (error)
-			return error;
-
-		new_block = 0;
-		bp = (uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode));
-		for (x = 0; x < sdp->sd_diptrs; x++, bp++)
-			if (*bp) {
-				new_block = 1;
-				break;
-			}
-
-		if (new_block) {
-			/* Get a new block, fill it with the old direct
-			   pointers, and write it out */
-
-			block = gfs2_alloc_meta(ip);
-
-			bh = gfs2_meta_new(ip->i_gl, block);
-			gfs2_trans_add_bh(ip->i_gl, bh, 1);
-			gfs2_metatype_set(bh,
-					  GFS2_METATYPE_IN,
-					  GFS2_FORMAT_IN);
-			gfs2_buffer_copy_tail(bh,
-					      sizeof(struct gfs2_meta_header),
-					      dibh, sizeof(struct gfs2_dinode));
-
-			brelse(bh);
-		}
-
-		/*  Set up the new direct pointer and write it out to disk  */
-
-		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-
-		gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
-
-		if (new_block) {
-			*(uint64_t *)(dibh->b_data +
-				      sizeof(struct gfs2_dinode)) =
-				      cpu_to_be64(block);
-			ip->i_di.di_blocks++;
-		}
-
-		ip->i_di.di_height++;
-
-		gfs2_dinode_out(&ip->i_di, dibh->b_data);
-		brelse(dibh);
-	}
-
-	return 0;
-}
 
 /**
  * find_metapath - Find path through the metadata tree
- * @ip: The inode pointer
+ * @sdp: The superblock
  * @mp: The metapath to return the result in
  * @block: The disk block to look up
+ * @height: The pre-calculated height of the metadata tree
  *
  *   This routine returns a struct metapath structure that defines a path
  *   through the metadata of inode "ip" to get to block "block".
@@ -322,21 +239,25 @@ static int build_height(struct gfs2_inode *ip, int height)
  *
  */
 
-static void find_metapath(struct gfs2_inode *ip, uint64_t block,
-			  struct metapath *mp)
+static void find_metapath(const struct gfs2_sbd *sdp, u64 block,
+			  struct metapath *mp, unsigned int height)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
-	uint64_t b = block;
 	unsigned int i;
 
-	for (i = ip->i_di.di_height; i--;)
-		mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs);
+	for (i = height; i--;)
+		mp->mp_list[i] = do_div(block, sdp->sd_inptrs);
+
+}
 
+static inline unsigned int metapath_branch_start(const struct metapath *mp)
+{
+	if (mp->mp_list[0] == 0)
+		return 2;
+	return 1;
 }
 
 /**
  * metapointer - Return pointer to start of metadata in a buffer
- * @bh: The buffer
  * @height: The metadata height (0 = dinode)
  * @mp: The metapath
  *
@@ -345,174 +266,406 @@ static void find_metapath(struct gfs2_inode *ip, uint64_t block,
  * metadata tree.
  */
 
-static inline uint64_t *metapointer(struct buffer_head *bh,
-				    unsigned int height, struct metapath *mp)
+static inline __be64 *metapointer(unsigned int height, const struct metapath *mp)
 {
+	struct buffer_head *bh = mp->mp_bh[height];
 	unsigned int head_size = (height > 0) ?
 		sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
-
-	return ((uint64_t *)(bh->b_data + head_size)) + mp->mp_list[height];
+	return ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height];
 }
 
 /**
- * lookup_block - Get the next metadata block in metadata tree
- * @ip: The GFS2 inode
- * @bh: Buffer containing the pointers to metadata blocks
- * @height: The height of the tree (0 = dinode)
+ * lookup_metapath - Walk the metadata tree to a specific point
+ * @ip: The inode
  * @mp: The metapath
- * @create: Non-zero if we may create a new meatdata block
- * @new: Used to indicate if we did create a new metadata block
- * @block: the returned disk block number
  *
- * Given a metatree, complete to a particular height, checks to see if the next
- * height of the tree exists. If not the next height of the tree is created.
- * The block number of the next height of the metadata tree is returned.
+ * Assumes that the inode's buffer has already been looked up and
+ * hooked onto mp->mp_bh[0] and that the metapath has been initialised
+ * by find_metapath().
  *
+ * If this function encounters part of the tree which has not been
+ * allocated, it returns the current height of the tree at the point
+ * at which it found the unallocated block. Blocks which are found are
+ * added to the mp->mp_bh[] list.
+ *
+ * Returns: error or height of metadata tree
  */
 
-static void lookup_block(struct gfs2_inode *ip, struct buffer_head *bh,
-			 unsigned int height, struct metapath *mp, int create,
-			 int *new, uint64_t *block)
+static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp)
 {
-	uint64_t *ptr = metapointer(bh, height, mp);
+	unsigned int end_of_metadata = ip->i_height - 1;
+	unsigned int x;
+	__be64 *ptr;
+	u64 dblock;
+	int ret;
 
-	if (*ptr) {
-		*block = be64_to_cpu(*ptr);
-		return;
+	for (x = 0; x < end_of_metadata; x++) {
+		ptr = metapointer(x, mp);
+		dblock = be64_to_cpu(*ptr);
+		if (!dblock)
+			return x + 1;
+
+		ret = gfs2_meta_indirect_buffer(ip, x+1, dblock, 0, &mp->mp_bh[x+1]);
+		if (ret)
+			return ret;
 	}
 
-	*block = 0;
-
-	if (!create)
-		return;
-
-	if (height == ip->i_di.di_height - 1 &&
-	    !gfs2_is_dir(ip))
-		*block = gfs2_alloc_data(ip);
-	else
-		*block = gfs2_alloc_meta(ip);
-
-	gfs2_trans_add_bh(ip->i_gl, bh, 1);
+	return ip->i_height;
+}
 
-	*ptr = cpu_to_be64(*block);
-	ip->i_di.di_blocks++;
+static inline void release_metapath(struct metapath *mp)
+{
+	int i;
 
-	*new = 1;
+	for (i = 0; i < GFS2_MAX_META_HEIGHT; i++) {
+		if (mp->mp_bh[i] == NULL)
+			break;
+		brelse(mp->mp_bh[i]);
+	}
 }
 
 /**
- * gfs2_block_map - Map a block from an inode to a disk block
- * @ip: The GFS2 inode
- * @lblock: The logical block number
- * @new: Value/Result argument (1 = may create/did create new blocks)
- * @dblock: the disk block number of the start of an extent
- * @extlen: the size of the extent
+ * gfs2_extent_length - Returns length of an extent of blocks
+ * @start: Start of the buffer
+ * @len: Length of the buffer in bytes
+ * @ptr: Current position in the buffer
+ * @limit: Max extent length to return (0 = unlimited)
+ * @eob: Set to 1 if we hit "end of block"
  *
- * Find the block number on the current device which corresponds to an
- * inode's block. If the block had to be created, "new" will be set.
+ * If the first block is zero (unallocated) it will return the number of
+ * unallocated blocks in the extent, otherwise it will return the number
+ * of contiguous blocks in the extent.
  *
- * Returns: errno
+ * Returns: The length of the extent (minimum of one block)
  */
 
-int gfs2_block_map(struct gfs2_inode *ip, uint64_t lblock, int *new,
-		   uint64_t *dblock, uint32_t *extlen)
+static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
-	struct buffer_head *bh;
-	struct metapath mp;
-	int create = *new;
-	unsigned int bsize;
-	unsigned int height;
-	unsigned int end_of_metadata;
-	unsigned int x;
-	int error = 0;
-
-	*new = 0;
-	*dblock = 0;
-	if (extlen)
-		*extlen = 0;
+	const __be64 *end = (start + len);
+	const __be64 *first = ptr;
+	u64 d = be64_to_cpu(*ptr);
+
+	*eob = 0;
+	do {
+		ptr++;
+		if (ptr >= end)
+			break;
+		if (limit && --limit == 0)
+			break;
+		if (d)
+			d++;
+	} while(be64_to_cpu(*ptr) == d);
+	if (ptr >= end)
+		*eob = 1;
+	return (ptr - first);
+}
 
+static inline void bmap_lock(struct gfs2_inode *ip, int create)
+{
 	if (create)
 		down_write(&ip->i_rw_mutex);
 	else
 		down_read(&ip->i_rw_mutex);
+}
 
-	if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
-		goto out;
-
-	bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize;
+static inline void bmap_unlock(struct gfs2_inode *ip, int create)
+{
+	if (create)
+		up_write(&ip->i_rw_mutex);
+	else
+		up_read(&ip->i_rw_mutex);
+}
 
-	height = calc_tree_height(ip, (lblock + 1) * bsize);
-	if (ip->i_di.di_height < height) {
-		if (!create)
-			goto out;
+static inline __be64 *gfs2_indirect_init(struct metapath *mp,
+					 struct gfs2_glock *gl, unsigned int i,
+					 unsigned offset, u64 bn)
+{
+	__be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data +
+		       ((i > 1) ? sizeof(struct gfs2_meta_header) :
+				 sizeof(struct gfs2_dinode)));
+	BUG_ON(i < 1);
+	BUG_ON(mp->mp_bh[i] != NULL);
+	mp->mp_bh[i] = gfs2_meta_new(gl, bn);
+	gfs2_trans_add_bh(gl, mp->mp_bh[i], 1);
+	gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
+	gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header));
+	ptr += offset;
+	*ptr = cpu_to_be64(bn);
+	return ptr;
+}
 
-		error = build_height(ip, height);
-		if (error)
-			goto out;
-	}
+enum alloc_state {
+	ALLOC_DATA = 0,
+	ALLOC_GROW_DEPTH = 1,
+	ALLOC_GROW_HEIGHT = 2,
+	/* ALLOC_UNSTUFF = 3,   TBD and rather complicated */
+};
 
-	find_metapath(ip, lblock, &mp);
-	end_of_metadata = ip->i_di.di_height - 1;
+/**
+ * gfs2_bmap_alloc - Build a metadata tree of the requested height
+ * @inode: The GFS2 inode
+ * @lblock: The logical starting block of the extent
+ * @bh_map: This is used to return the mapping details
+ * @mp: The metapath
+ * @sheight: The starting height (i.e. whats already mapped)
+ * @height: The height to build to
+ * @maxlen: The max number of data blocks to alloc
+ *
+ * In this routine we may have to alloc:
+ *   i) Indirect blocks to grow the metadata tree height
+ *  ii) Indirect blocks to fill in lower part of the metadata tree
+ * iii) Data blocks
+ *
+ * The function is in two parts. The first part works out the total
+ * number of blocks which we need. The second part does the actual
+ * allocation asking for an extent at a time (if enough contiguous free
+ * blocks are available, there will only be one request per bmap call)
+ * and uses the state machine to initialise the blocks in order.
+ *
+ * Returns: errno on error
+ */
 
-	error = gfs2_meta_inode_buffer(ip, &bh);
-	if (error)
-		goto out;
+static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
+			   struct buffer_head *bh_map, struct metapath *mp,
+			   const unsigned int sheight,
+			   const unsigned int height,
+			   const unsigned int maxlen)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	struct buffer_head *dibh = mp->mp_bh[0];
+	u64 bn, dblock = 0;
+	unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
+	unsigned dblks = 0;
+	unsigned ptrs_per_blk;
+	const unsigned end_of_metadata = height - 1;
+	int eob = 0;
+	enum alloc_state state;
+	__be64 *ptr;
+	__be64 zero_bn = 0;
+
+	BUG_ON(sheight < 1);
+	BUG_ON(dibh == NULL);
 
-	for (x = 0; x < end_of_metadata; x++) {
-		lookup_block(ip, bh, x, &mp, create, new, dblock);
-		brelse(bh);
-		if (!*dblock)
-			goto out;
+	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 
-		error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh);
-		if (error)
-			goto out;
+	if (height == sheight) {
+		struct buffer_head *bh;
+		/* Bottom indirect block exists, find unalloced extent size */
+		ptr = metapointer(end_of_metadata, mp);
+		bh = mp->mp_bh[end_of_metadata];
+		dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen,
+					   &eob);
+		BUG_ON(dblks < 1);
+		state = ALLOC_DATA;
+	} else {
+		/* Need to allocate indirect blocks */
+		ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs;
+		dblks = min(maxlen, ptrs_per_blk - mp->mp_list[end_of_metadata]);
+		if (height == ip->i_height) {
+			/* Writing into existing tree, extend tree down */
+			iblks = height - sheight;
+			state = ALLOC_GROW_DEPTH;
+		} else {
+			/* Building up tree height */
+			state = ALLOC_GROW_HEIGHT;
+			iblks = height - ip->i_height;
+			branch_start = metapath_branch_start(mp);
+			iblks += (height - branch_start);
+		}
 	}
 
-	lookup_block(ip, bh, end_of_metadata, &mp, create, new, dblock);
+	/* start of the second part of the function (state machine) */
 
-	if (extlen && *dblock) {
-		*extlen = 1;
-
-		if (!*new) {
-			uint64_t tmp_dblock;
-			int tmp_new;
-			unsigned int nptrs;
+	blks = dblks + iblks;
+	i = sheight;
+	do {
+		int error;
+		n = blks - alloced;
+		error = gfs2_alloc_block(ip, &bn, &n);
+		if (error)
+			return error;
+		alloced += n;
+		if (state != ALLOC_DATA || gfs2_is_jdata(ip))
+			gfs2_trans_add_unrevoke(sdp, bn, n);
+		switch (state) {
+		/* Growing height of tree */
+		case ALLOC_GROW_HEIGHT:
+			if (i == 1) {
+				ptr = (__be64 *)(dibh->b_data +
+						 sizeof(struct gfs2_dinode));
+				zero_bn = *ptr;
+			}
+			for (; i - 1 < height - ip->i_height && n > 0; i++, n--)
+				gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
+			if (i - 1 == height - ip->i_height) {
+				i--;
+				gfs2_buffer_copy_tail(mp->mp_bh[i],
+						sizeof(struct gfs2_meta_header),
+						dibh, sizeof(struct gfs2_dinode));
+				gfs2_buffer_clear_tail(dibh,
+						sizeof(struct gfs2_dinode) +
+						sizeof(__be64));
+				ptr = (__be64 *)(mp->mp_bh[i]->b_data +
+					sizeof(struct gfs2_meta_header));
+				*ptr = zero_bn;
+				state = ALLOC_GROW_DEPTH;
+				for(i = branch_start; i < height; i++) {
+					if (mp->mp_bh[i] == NULL)
+						break;
+					brelse(mp->mp_bh[i]);
+					mp->mp_bh[i] = NULL;
+				}
+				i = branch_start;
+			}
+			if (n == 0)
+				break;
+		/* Branching from existing tree */
+		case ALLOC_GROW_DEPTH:
+			if (i > 1 && i < height)
+				gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[i-1], 1);
+			for (; i < height && n > 0; i++, n--)
+				gfs2_indirect_init(mp, ip->i_gl, i,
+						   mp->mp_list[i-1], bn++);
+			if (i == height)
+				state = ALLOC_DATA;
+			if (n == 0)
+				break;
+		/* Tree complete, adding data blocks */
+		case ALLOC_DATA:
+			BUG_ON(n > dblks);
+			BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
+			gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[end_of_metadata], 1);
+			dblks = n;
+			ptr = metapointer(end_of_metadata, mp);
+			dblock = bn;
+			while (n-- > 0)
+				*ptr++ = cpu_to_be64(bn++);
+			break;
+		}
+	} while ((state != ALLOC_DATA) || !dblock);
+
+	ip->i_height = height;
+	gfs2_add_inode_blocks(&ip->i_inode, alloced);
+	gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
+	map_bh(bh_map, inode->i_sb, dblock);
+	bh_map->b_size = dblks << inode->i_blkbits;
+	set_buffer_new(bh_map);
+	return 0;
+}
 
-			nptrs = (end_of_metadata) ? sdp->sd_inptrs :
-						    sdp->sd_diptrs;
+/**
+ * gfs2_block_map - Map a block from an inode to a disk block
+ * @inode: The inode
+ * @lblock: The logical block number
+ * @bh_map: The bh to be mapped
+ * @create: True if its ok to alloc blocks to satify the request
+ *
+ * Sets buffer_mapped() if successful, sets buffer_boundary() if a
+ * read of metadata will be required before the next block can be
+ * mapped. Sets buffer_new() if new blocks were allocated.
+ *
+ * Returns: errno
+ */
 
-			while (++mp.mp_list[end_of_metadata] < nptrs) {
-				lookup_block(ip, bh, end_of_metadata, &mp,
-					     0, &tmp_new, &tmp_dblock);
+int gfs2_block_map(struct inode *inode, sector_t lblock,
+		   struct buffer_head *bh_map, int create)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	unsigned int bsize = sdp->sd_sb.sb_bsize;
+	const unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
+	const u64 *arr = sdp->sd_heightsize;
+	__be64 *ptr;
+	u64 size;
+	struct metapath mp;
+	int ret;
+	int eob;
+	unsigned int len;
+	struct buffer_head *bh;
+	u8 height;
 
-				if (*dblock + *extlen != tmp_dblock)
-					break;
+	BUG_ON(maxlen == 0);
 
-				(*extlen)++;
-			}
-		}
+	memset(mp.mp_bh, 0, sizeof(mp.mp_bh));
+	bmap_lock(ip, create);
+	clear_buffer_mapped(bh_map);
+	clear_buffer_new(bh_map);
+	clear_buffer_boundary(bh_map);
+	trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
+	if (gfs2_is_dir(ip)) {
+		bsize = sdp->sd_jbsize;
+		arr = sdp->sd_jheightsize;
 	}
 
-	brelse(bh);
+	ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
+	if (ret)
+		goto out;
 
-	if (*new) {
-		error = gfs2_meta_inode_buffer(ip, &bh);
-		if (!error) {
-			gfs2_trans_add_bh(ip->i_gl, bh, 1);
-			gfs2_dinode_out(&ip->i_di, bh->b_data);
-			brelse(bh);
-		}
+	height = ip->i_height;
+	size = (lblock + 1) * bsize;
+	while (size > arr[height])
+		height++;
+	find_metapath(sdp, lblock, &mp, height);
+	ret = 1;
+	if (height > ip->i_height || gfs2_is_stuffed(ip))
+		goto do_alloc;
+	ret = lookup_metapath(ip, &mp);
+	if (ret < 0)
+		goto out;
+	if (ret != ip->i_height)
+		goto do_alloc;
+	ptr = metapointer(ip->i_height - 1, &mp);
+	if (*ptr == 0)
+		goto do_alloc;
+	map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
+	bh = mp.mp_bh[ip->i_height - 1];
+	len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
+	bh_map->b_size = (len << inode->i_blkbits);
+	if (eob)
+		set_buffer_boundary(bh_map);
+	ret = 0;
+out:
+	release_metapath(&mp);
+	trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
+	bmap_unlock(ip, create);
+	return ret;
+
+do_alloc:
+	/* All allocations are done here, firstly check create flag */
+	if (!create) {
+		BUG_ON(gfs2_is_stuffed(ip));
+		ret = 0;
+		goto out;
 	}
 
- out:
-	if (create)
-		up_write(&ip->i_rw_mutex);
-	else
-		up_read(&ip->i_rw_mutex);
+	/* At this point ret is the tree depth of already allocated blocks */
+	ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen);
+	goto out;
+}
 
-	return error;
+/*
+ * Deprecated: do not use in new code
+ */
+int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
+{
+	struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 };
+	int ret;
+	int create = *new;
+
+	BUG_ON(!extlen);
+	BUG_ON(!dblock);
+	BUG_ON(!new);
+
+	bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5));
+	ret = gfs2_block_map(inode, lblock, &bh, create);
+	*extlen = bh.b_size >> inode->i_blkbits;
+	*dblock = bh.b_blocknr;
+	if (buffer_new(&bh))
+		*new = 1;
+	else
+		*new = 0;
+	return ret;
 }
 
 /**
@@ -534,13 +687,13 @@ int gfs2_block_map(struct gfs2_inode *ip, uint64_t lblock, int *new,
 
 static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
 			  struct metapath *mp, unsigned int height,
-			  uint64_t block, int first, block_call_t bc,
+			  u64 block, int first, block_call_t bc,
 			  void *data)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head *bh = NULL;
-	uint64_t *top, *bottom;
-	uint64_t bn;
+	__be64 *top, *bottom;
+	u64 bn;
 	int error;
 	int mh_size = sizeof(struct gfs2_meta_header);
 
@@ -550,26 +703,24 @@ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
 			return error;
 		dibh = bh;
 
-		top = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
-			mp->mp_list[0];
-		bottom = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
-			sdp->sd_diptrs;
+		top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
+		bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs;
 	} else {
 		error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh);
 		if (error)
 			return error;
 
-		top = (uint64_t *)(bh->b_data + mh_size) +
-				  ((first) ? mp->mp_list[height] : 0);
+		top = (__be64 *)(bh->b_data + mh_size) +
+				  (first ? mp->mp_list[height] : 0);
 
-		bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs;
+		bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
 	}
 
 	error = bc(ip, dibh, bh, top, bottom, height, data);
 	if (error)
 		goto out;
 
-	if (height < ip->i_di.di_height - 1)
+	if (height < ip->i_height - 1)
 		for (; top < bottom; top++, first = 0) {
 			if (!*top)
 				continue;
@@ -582,9 +733,8 @@ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
 				break;
 		}
 
- out:
+out:
 	brelse(bh);
-
 	return error;
 }
 
@@ -602,15 +752,15 @@ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
  */
 
 static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
-		    struct buffer_head *bh, uint64_t *top, uint64_t *bottom,
+		    struct buffer_head *bh, __be64 *top, __be64 *bottom,
 		    unsigned int height, void *data)
 {
-	struct strip_mine *sm = (struct strip_mine *)data;
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct strip_mine *sm = data;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_rgrp_list rlist;
-	uint64_t bn, bstart;
-	uint32_t blen;
-	uint64_t *p;
+	u64 bn, bstart;
+	u32 blen;
+	__be64 *p;
 	unsigned int rg_blocks = 0;
 	int metadata;
 	unsigned int revokes = 0;
@@ -628,11 +778,11 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 		sm->sm_first = 0;
 	}
 
-	metadata = (height != ip->i_di.di_height - 1);
+	metadata = (height != ip->i_height - 1);
 	if (metadata)
 		revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
 
-	error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh);
+	error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
 	if (error)
 		return error;
 
@@ -662,12 +812,12 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 	else
 		goto out; /* Nothing to do */
 
-	gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
+	gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
 
 	for (x = 0; x < rlist.rl_rgrps; x++) {
 		struct gfs2_rgrpd *rgd;
 		rgd = rlist.rl_ghs[x].gh_gl->gl_object;
-		rg_blocks += rgd->rd_ri.ri_length;
+		rg_blocks += rgd->rd_length;
 	}
 
 	error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
@@ -709,9 +859,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 		}
 
 		*p = 0;
-		if (!ip->i_di.di_blocks)
-			gfs2_consist_inode(ip);
-		ip->i_di.di_blocks--;
+		gfs2_add_inode_blocks(&ip->i_inode, -1);
 	}
 	if (bstart) {
 		if (metadata)
@@ -720,23 +868,20 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 			gfs2_free_data(ip, bstart, blen);
 	}
 
-	ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+	ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
 
-	gfs2_dinode_out(&ip->i_di, dibh->b_data);
+	gfs2_dinode_out(ip, dibh->b_data);
 
 	up_write(&ip->i_rw_mutex);
 
 	gfs2_trans_end(sdp);
 
- out_rg_gunlock:
+out_rg_gunlock:
 	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
-
- out_rlist:
+out_rlist:
 	gfs2_rlist_free(&rlist);
-
- out:
-	gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
-
+out:
+	gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
 	return error;
 }
 
@@ -750,24 +895,21 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
  * Returns: errno
  */
 
-static int do_grow(struct gfs2_inode *ip, uint64_t size)
+static int do_grow(struct gfs2_inode *ip, u64 size)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_alloc *al;
 	struct buffer_head *dibh;
-	unsigned int h;
 	int error;
 
 	al = gfs2_alloc_get(ip);
+	if (!al)
+		return -ENOMEM;
 
-	error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+	error = gfs2_quota_lock_check(ip);
 	if (error)
 		goto out;
 
-	error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
-	if (error)
-		goto out_gunlock_q;
-
 	al->al_requested = sdp->sd_max_height + RES_DATA;
 
 	error = gfs2_inplace_reserve(ip);
@@ -775,64 +917,122 @@ static int do_grow(struct gfs2_inode *ip, uint64_t size)
 		goto out_gunlock_q;
 
 	error = gfs2_trans_begin(sdp,
-			sdp->sd_max_height + al->al_rgd->rd_ri.ri_length +
+			sdp->sd_max_height + al->al_rgd->rd_length +
 			RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 	if (error)
 		goto out_ipres;
 
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto out_end_trans;
+
 	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
 		if (gfs2_is_stuffed(ip)) {
-			error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
-						    NULL);
+			error = gfs2_unstuff_dinode(ip, NULL);
 			if (error)
-				goto out_end_trans;
-		}
-
-		h = calc_tree_height(ip, size);
-		if (ip->i_di.di_height < h) {
-			down_write(&ip->i_rw_mutex);
-			error = build_height(ip, h);
-			up_write(&ip->i_rw_mutex);
-			if (error)
-				goto out_end_trans;
+				goto out_brelse;
 		}
 	}
 
-	ip->i_di.di_size = size;
-	ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
-
-	error = gfs2_meta_inode_buffer(ip, &dibh);
-	if (error)
-		goto out_end_trans;
-
+	ip->i_disksize = size;
+	ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
 	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-	gfs2_dinode_out(&ip->i_di, dibh->b_data);
-	brelse(dibh);
+	gfs2_dinode_out(ip, dibh->b_data);
 
- out_end_trans:
+out_brelse:
+	brelse(dibh);
+out_end_trans:
 	gfs2_trans_end(sdp);
-
- out_ipres:
+out_ipres:
 	gfs2_inplace_release(ip);
-
- out_gunlock_q:
+out_gunlock_q:
 	gfs2_quota_unlock(ip);
-
- out:
+out:
 	gfs2_alloc_put(ip);
-
 	return error;
 }
 
-static int trunc_start(struct gfs2_inode *ip, uint64_t size)
+
+/**
+ * gfs2_block_truncate_page - Deal with zeroing out data for truncate
+ *
+ * This is partly borrowed from ext3.
+ */
+static int gfs2_block_truncate_page(struct address_space *mapping)
+{
+	struct inode *inode = mapping->host;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	loff_t from = inode->i_size;
+	unsigned long index = from >> PAGE_CACHE_SHIFT;
+	unsigned offset = from & (PAGE_CACHE_SIZE-1);
+	unsigned blocksize, iblock, length, pos;
+	struct buffer_head *bh;
+	struct page *page;
+	int err;
+
+	page = grab_cache_page(mapping, index);
+	if (!page)
+		return 0;
+
+	blocksize = inode->i_sb->s_blocksize;
+	length = blocksize - (offset & (blocksize - 1));
+	iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
+
+	if (!page_has_buffers(page))
+		create_empty_buffers(page, blocksize, 0);
+
+	/* Find the buffer that contains "offset" */
+	bh = page_buffers(page);
+	pos = blocksize;
+	while (offset >= pos) {
+		bh = bh->b_this_page;
+		iblock++;
+		pos += blocksize;
+	}
+
+	err = 0;
+
+	if (!buffer_mapped(bh)) {
+		gfs2_block_map(inode, iblock, bh, 0);
+		/* unmapped? It's a hole - nothing to do */
+		if (!buffer_mapped(bh))
+			goto unlock;
+	}
+
+	/* Ok, it's mapped. Make sure it's up-to-date */
+	if (PageUptodate(page))
+		set_buffer_uptodate(bh);
+
+	if (!buffer_uptodate(bh)) {
+		err = -EIO;
+		ll_rw_block(READ, 1, &bh);
+		wait_on_buffer(bh);
+		/* Uhhuh. Read error. Complain and punt. */
+		if (!buffer_uptodate(bh))
+			goto unlock;
+		err = 0;
+	}
+
+	if (!gfs2_is_writeback(ip))
+		gfs2_trans_add_bh(ip->i_gl, bh, 0);
+
+	zero_user(page, offset, length);
+	mark_buffer_dirty(bh);
+unlock:
+	unlock_page(page);
+	page_cache_release(page);
+	return err;
+}
+
+static int trunc_start(struct gfs2_inode *ip, u64 size)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head *dibh;
 	int journaled = gfs2_is_jdata(ip);
 	int error;
 
 	error = gfs2_trans_begin(sdp,
-				 RES_DINODE + ((journaled) ? RES_JDATA : 0), 0);
+				 RES_DINODE + (journaled ? RES_JDATA : 0), 0);
 	if (error)
 		return error;
 
@@ -841,48 +1041,50 @@ static int trunc_start(struct gfs2_inode *ip, uint64_t size)
 		goto out;
 
 	if (gfs2_is_stuffed(ip)) {
-		ip->i_di.di_size = size;
-		ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+		u64 dsize = size + sizeof(struct gfs2_inode);
+		ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-		gfs2_dinode_out(&ip->i_di, dibh->b_data);
-		gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size);
+		gfs2_dinode_out(ip, dibh->b_data);
+		if (dsize > dibh->b_size)
+			dsize = dibh->b_size;
+		gfs2_buffer_clear_tail(dibh, dsize);
 		error = 1;
-
 	} else {
-		if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1))
-			error = gfs2_block_truncate_page(ip->i_vnode->i_mapping);
+		if (size & (u64)(sdp->sd_sb.sb_bsize - 1))
+			error = gfs2_block_truncate_page(ip->i_inode.i_mapping);
 
 		if (!error) {
-			ip->i_di.di_size = size;
-			ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
-			ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG;
+			ip->i_disksize = size;
+			ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
+			ip->i_diskflags |= GFS2_DIF_TRUNC_IN_PROG;
 			gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-			gfs2_dinode_out(&ip->i_di, dibh->b_data);
+			gfs2_dinode_out(ip, dibh->b_data);
 		}
 	}
 
 	brelse(dibh);
 
- out:
+out:
 	gfs2_trans_end(sdp);
-
 	return error;
 }
 
-static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size)
+static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
 {
-	unsigned int height = ip->i_di.di_height;
-	uint64_t lblock;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	unsigned int height = ip->i_height;
+	u64 lblock;
 	struct metapath mp;
 	int error;
 
 	if (!size)
 		lblock = 0;
 	else
-		lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift;
+		lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift;
 
-	find_metapath(ip, lblock, &mp);
-	gfs2_alloc_get(ip);
+	find_metapath(sdp, lblock, &mp, ip->i_height);
+	if (!gfs2_alloc_get(ip))
+		return -ENOMEM;
 
 	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 	if (error)
@@ -900,14 +1102,14 @@ static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size)
 
 	gfs2_quota_unhold(ip);
 
- out:
+out:
 	gfs2_alloc_put(ip);
 	return error;
 }
 
 static int trunc_end(struct gfs2_inode *ip)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct buffer_head *dibh;
 	int error;
 
@@ -921,25 +1123,21 @@ static int trunc_end(struct gfs2_inode *ip)
 	if (error)
 		goto out;
 
-	if (!ip->i_di.di_size) {
-		ip->i_di.di_height = 0;
-		ip->i_di.di_goal_meta =
-			ip->i_di.di_goal_data =
-			ip->i_num.no_addr;
+	if (!ip->i_disksize) {
+		ip->i_height = 0;
+		ip->i_goal = ip->i_no_addr;
 		gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 	}
-	ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
-	ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG;
+	ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
+	ip->i_diskflags &= ~GFS2_DIF_TRUNC_IN_PROG;
 
 	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-	gfs2_dinode_out(&ip->i_di, dibh->b_data);
+	gfs2_dinode_out(ip, dibh->b_data);
 	brelse(dibh);
 
- out:
+out:
 	up_write(&ip->i_rw_mutex);
-
 	gfs2_trans_end(sdp);
-
 	return error;
 }
 
@@ -954,7 +1152,7 @@ static int trunc_end(struct gfs2_inode *ip)
  * Returns: errno
  */
 
-static int do_shrink(struct gfs2_inode *ip, uint64_t size)
+static int do_shrink(struct gfs2_inode *ip, u64 size)
 {
 	int error;
 
@@ -971,6 +1169,33 @@ static int do_shrink(struct gfs2_inode *ip, uint64_t size)
 	return error;
 }
 
+static int do_touch(struct gfs2_inode *ip, u64 size)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	struct buffer_head *dibh;
+	int error;
+
+	error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+	if (error)
+		return error;
+
+	down_write(&ip->i_rw_mutex);
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		goto do_touch_out;
+
+	ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
+	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+	gfs2_dinode_out(ip, dibh->b_data);
+	brelse(dibh);
+
+do_touch_out:
+	up_write(&ip->i_rw_mutex);
+	gfs2_trans_end(sdp);
+	return error;
+}
+
 /**
  * gfs2_truncatei - make a file a given size
  * @ip: the inode
@@ -982,17 +1207,20 @@ static int do_shrink(struct gfs2_inode *ip, uint64_t size)
  * Returns: errno
  */
 
-int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size)
+int gfs2_truncatei(struct gfs2_inode *ip, u64 size)
 {
 	int error;
 
-	if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode)))
+	if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_inode.i_mode)))
 		return -EINVAL;
 
-	if (size > ip->i_di.di_size)
+	if (size > ip->i_disksize)
 		error = do_grow(ip, size);
-	else
+	else if (size < ip->i_disksize)
 		error = do_shrink(ip, size);
+	else
+		/* update time stamps */
+		error = do_touch(ip, size);
 
 	return error;
 }
@@ -1000,7 +1228,7 @@ int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size)
 int gfs2_truncatei_resume(struct gfs2_inode *ip)
 {
 	int error;
-	error = trunc_dealloc(ip, ip->i_di.di_size);
+	error = trunc_dealloc(ip, ip->i_disksize);
 	if (!error)
 		error = trunc_end(ip);
 	return error;
@@ -1012,35 +1240,6 @@ int gfs2_file_dealloc(struct gfs2_inode *ip)
 }
 
 /**
- * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
- * @ip: the file
- * @len: the number of bytes to be written to the file
- * @data_blocks: returns the number of data blocks required
- * @ind_blocks: returns the number of indirect blocks required
- *
- */
-
-void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
-			    unsigned int *data_blocks, unsigned int *ind_blocks)
-{
-	struct gfs2_sbd *sdp = ip->i_sbd;
-	unsigned int tmp;
-
-	if (gfs2_is_dir(ip)) {
-		*data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2;
-		*ind_blocks = 3 * (sdp->sd_max_jheight - 1);
-	} else {
-		*data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
-		*ind_blocks = 3 * (sdp->sd_max_height - 1);
-	}
-
-	for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
-		tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
-		*ind_blocks += tmp;
-	}
-}
-
-/**
  * gfs2_write_alloc_required - figure out if a write will require an allocation
  * @ip: the file being written to
  * @offset: the offset to write to
@@ -1050,14 +1249,14 @@ void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
  * Returns: errno
  */
 
-int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
+int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
 			      unsigned int len, int *alloc_required)
 {
-	struct gfs2_sbd *sdp = ip->i_sbd;
-	uint64_t lblock, lblock_stop, dblock;
-	uint32_t extlen;
-	int new = 0;
-	int error = 0;
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	struct buffer_head bh;
+	unsigned int shift;
+	u64 lblock, lblock_stop, size;
+	u64 end_of_file;
 
 	*alloc_required = 0;
 
@@ -1071,29 +1270,27 @@ int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
 		return 0;
 	}
 
-	if (gfs2_is_dir(ip)) {
-		unsigned int bsize = sdp->sd_jbsize;
-		lblock = offset;
-		do_div(lblock, bsize);
-		lblock_stop = offset + len + bsize - 1;
-		do_div(lblock_stop, bsize);
-	} else {
-		unsigned int shift = sdp->sd_sb.sb_bsize_shift;
-		lblock = offset >> shift;
-		lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
-	}
-
-	for (; lblock < lblock_stop; lblock += extlen) {
-		error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
-		if (error)
-			return error;
+	*alloc_required = 1;
+	shift = sdp->sd_sb.sb_bsize_shift;
+	BUG_ON(gfs2_is_dir(ip));
+	end_of_file = (ip->i_disksize + sdp->sd_sb.sb_bsize - 1) >> shift;
+	lblock = offset >> shift;
+	lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
+	if (lblock_stop > end_of_file)
+		return 0;
 
-		if (!dblock) {
-			*alloc_required = 1;
+	size = (lblock_stop - lblock) << shift;
+	do {
+		bh.b_state = 0;
+		bh.b_size = size;
+		gfs2_block_map(&ip->i_inode, lblock, &bh, 0);
+		if (!buffer_mapped(&bh))
 			return 0;
-		}
-	}
+		size -= bh.b_size;
+		lblock += (bh.b_size >> ip->i_inode.i_blkbits);
+	} while(size > 0);
 
+	*alloc_required = 0;
 	return 0;
 }