1 files changed, 421 insertions, 211 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index f90231eb291..236cd48184c 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -31,13 +31,14 @@
 
 #include "udfdecl.h"
 #include <linux/mm.h>
-#include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/pagemap.h>
 #include <linux/buffer_head.h>
 #include <linux/writeback.h>
 #include <linux/slab.h>
 #include <linux/crc-itu-t.h>
+#include <linux/mpage.h>
+#include <linux/aio.h>
 
 #include "udf_i.h"
 #include "udf_sb.h"
@@ -48,12 +49,12 @@ MODULE_LICENSE("GPL");
 
 #define EXTENT_MERGE_SIZE 5
 
-static mode_t udf_convert_permissions(struct fileEntry *);
+static umode_t udf_convert_permissions(struct fileEntry *);
 static int udf_update_inode(struct inode *, int);
 static void udf_fill_inode(struct inode *, struct buffer_head *);
+static int udf_sync_inode(struct inode *inode);
 static int udf_alloc_i_data(struct inode *inode, size_t size);
-static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
-					sector_t *, int *);
+static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
 static int8_t udf_insert_aext(struct inode *, struct extent_position,
 			      struct kernel_lb_addr, uint32_t);
 static void udf_split_extents(struct inode *, int *, int, int,
@@ -67,49 +68,118 @@ static void udf_update_extents(struct inode *,
 			       struct extent_position *);
 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
 
-
-void udf_delete_inode(struct inode *inode)
+static void __udf_clear_extent_cache(struct inode *inode)
 {
-	truncate_inode_pages(&inode->i_data, 0);
+	struct udf_inode_info *iinfo = UDF_I(inode);
 
-	if (is_bad_inode(inode))
-		goto no_delete;
+	if (iinfo->cached_extent.lstart != -1) {
+		brelse(iinfo->cached_extent.epos.bh);
+		iinfo->cached_extent.lstart = -1;
+	}
+}
 
-	inode->i_size = 0;
-	udf_truncate(inode);
-	lock_kernel();
+/* Invalidate extent cache */
+static void udf_clear_extent_cache(struct inode *inode)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+
+	spin_lock(&iinfo->i_extent_cache_lock);
+	__udf_clear_extent_cache(inode);
+	spin_unlock(&iinfo->i_extent_cache_lock);
+}
 
-	udf_update_inode(inode, IS_SYNC(inode));
-	udf_free_inode(inode);
+/* Return contents of extent cache */
+static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
+				 loff_t *lbcount, struct extent_position *pos)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	int ret = 0;
+
+	spin_lock(&iinfo->i_extent_cache_lock);
+	if ((iinfo->cached_extent.lstart <= bcount) &&
+	    (iinfo->cached_extent.lstart != -1)) {
+		/* Cache hit */
+		*lbcount = iinfo->cached_extent.lstart;
+		memcpy(pos, &iinfo->cached_extent.epos,
+		       sizeof(struct extent_position));
+		if (pos->bh)
+			get_bh(pos->bh);
+		ret = 1;
+	}
+	spin_unlock(&iinfo->i_extent_cache_lock);
+	return ret;
+}
 
-	unlock_kernel();
-	return;
+/* Add extent to extent cache */
+static void udf_update_extent_cache(struct inode *inode, loff_t estart,
+				    struct extent_position *pos, int next_epos)
+{
+	struct udf_inode_info *iinfo = UDF_I(inode);
 
-no_delete:
-	clear_inode(inode);
+	spin_lock(&iinfo->i_extent_cache_lock);
+	/* Invalidate previously cached extent */
+	__udf_clear_extent_cache(inode);
+	if (pos->bh)
+		get_bh(pos->bh);
+	memcpy(&iinfo->cached_extent.epos, pos,
+	       sizeof(struct extent_position));
+	iinfo->cached_extent.lstart = estart;
+	if (next_epos)
+		switch (iinfo->i_alloc_type) {
+		case ICBTAG_FLAG_AD_SHORT:
+			iinfo->cached_extent.epos.offset -=
+			sizeof(struct short_ad);
+			break;
+		case ICBTAG_FLAG_AD_LONG:
+			iinfo->cached_extent.epos.offset -=
+			sizeof(struct long_ad);
+		}
+	spin_unlock(&iinfo->i_extent_cache_lock);
 }
 
-/*
- * If we are going to release inode from memory, we truncate last inode extent
- * to proper length. We could use drop_inode() but it's called under inode_lock
- * and thus we cannot mark inode dirty there.  We use clear_inode() but we have
- * to make sure to write inode as it's not written automatically.
- */
-void udf_clear_inode(struct inode *inode)
+void udf_evict_inode(struct inode *inode)
 {
 	struct udf_inode_info *iinfo = UDF_I(inode);
+	int want_delete = 0;
 
+	if (!inode->i_nlink && !is_bad_inode(inode)) {
+		want_delete = 1;
+		udf_setsize(inode, 0);
+		udf_update_inode(inode, IS_SYNC(inode));
+	}
+	truncate_inode_pages_final(&inode->i_data);
+	invalidate_inode_buffers(inode);
+	clear_inode(inode);
 	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 	    inode->i_size != iinfo->i_lenExtents) {
-		printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
-			"inode size %llu different from extent lenght %llu. "
-			"Filesystem need not be standards compliant.\n",
-			inode->i_sb->s_id, inode->i_ino, inode->i_mode,
-			(unsigned long long)inode->i_size,
-			(unsigned long long)iinfo->i_lenExtents);
+		udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
+			 inode->i_ino, inode->i_mode,
+			 (unsigned long long)inode->i_size,
+			 (unsigned long long)iinfo->i_lenExtents);
 	}
 	kfree(iinfo->i_ext.i_data);
 	iinfo->i_ext.i_data = NULL;
+	udf_clear_extent_cache(inode);
+	if (want_delete) {
+		udf_free_inode(inode);
+	}
+}
+
+static void udf_write_failed(struct address_space *mapping, loff_t to)
+{
+	struct inode *inode = mapping->host;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	loff_t isize = inode->i_size;
+
+	if (to > isize) {
+		truncate_pagecache(inode, isize);
+		if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+			down_write(&iinfo->i_data_sem);
+			udf_clear_extent_cache(inode);
+			udf_truncate_extents(inode);
+			up_write(&iinfo->i_data_sem);
+		}
+	}
 }
 
 static int udf_writepage(struct page *page, struct writeback_control *wbc)
@@ -117,18 +187,49 @@ static int udf_writepage(struct page *page, struct writeback_control *wbc)
 	return block_write_full_page(page, udf_get_block, wbc);
 }
 
+static int udf_writepages(struct address_space *mapping,
+			struct writeback_control *wbc)
+{
+	return mpage_writepages(mapping, wbc, udf_get_block);
+}
+
 static int udf_readpage(struct file *file, struct page *page)
 {
-	return block_read_full_page(page, udf_get_block);
+	return mpage_readpage(page, udf_get_block);
+}
+
+static int udf_readpages(struct file *file, struct address_space *mapping,
+			struct list_head *pages, unsigned nr_pages)
+{
+	return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 }
 
 static int udf_write_begin(struct file *file, struct address_space *mapping,
 			loff_t pos, unsigned len, unsigned flags,
 			struct page **pagep, void **fsdata)
 {
-	*pagep = NULL;
-	return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
-				udf_get_block);
+	int ret;
+
+	ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
+	if (unlikely(ret))
+		udf_write_failed(mapping, pos + len);
+	return ret;
+}
+
+static ssize_t udf_direct_IO(int rw, struct kiocb *iocb,
+			     struct iov_iter *iter,
+			     loff_t offset)
+{
+	struct file *file = iocb->ki_filp;
+	struct address_space *mapping = file->f_mapping;
+	struct inode *inode = mapping->host;
+	size_t count = iov_iter_count(iter);
+	ssize_t ret;
+
+	ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, udf_get_block);
+	if (unlikely(ret < 0 && (rw & WRITE)))
+		udf_write_failed(mapping, offset + count);
+	return ret;
 }
 
 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
@@ -138,37 +239,53 @@ static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 
 const struct address_space_operations udf_aops = {
 	.readpage	= udf_readpage,
+	.readpages	= udf_readpages,
 	.writepage	= udf_writepage,
-	.sync_page	= block_sync_page,
-	.write_begin		= udf_write_begin,
-	.write_end		= generic_write_end,
+	.writepages	= udf_writepages,
+	.write_begin	= udf_write_begin,
+	.write_end	= generic_write_end,
+	.direct_IO	= udf_direct_IO,
 	.bmap		= udf_bmap,
 };
 
-void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
+/*
+ * Expand file stored in ICB to a normal one-block-file
+ *
+ * This function requires i_data_sem for writing and releases it.
+ * This function requires i_mutex held
+ */
+int udf_expand_file_adinicb(struct inode *inode)
 {
 	struct page *page;
 	char *kaddr;
 	struct udf_inode_info *iinfo = UDF_I(inode);
+	int err;
 	struct writeback_control udf_wbc = {
 		.sync_mode = WB_SYNC_NONE,
 		.nr_to_write = 1,
 	};
 
-	/* from now on we have normal address_space methods */
-	inode->i_data.a_ops = &udf_aops;
-
+	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
 	if (!iinfo->i_lenAlloc) {
 		if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 			iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 		else
 			iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
+		/* from now on we have normal address_space methods */
+		inode->i_data.a_ops = &udf_aops;
+		up_write(&iinfo->i_data_sem);
 		mark_inode_dirty(inode);
-		return;
+		return 0;
 	}
+	/*
+	 * Release i_data_sem so that we can lock a page - page lock ranks
+	 * above i_data_sem. i_mutex still protects us against file changes.
+	 */
+	up_write(&iinfo->i_data_sem);
 
-	page = grab_cache_page(inode->i_mapping, 0);
-	BUG_ON(!PageLocked(page));
+	page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
+	if (!page)
+		return -ENOMEM;
 
 	if (!PageUptodate(page)) {
 		kaddr = kmap(page);
@@ -180,6 +297,7 @@ void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 		SetPageUptodate(page);
 		kunmap(page);
 	}
+	down_write(&iinfo->i_data_sem);
 	memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 	       iinfo->i_lenAlloc);
 	iinfo->i_lenAlloc = 0;
@@ -187,11 +305,27 @@ void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 	else
 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
-
-	inode->i_data.a_ops->writepage(page, &udf_wbc);
+	/* from now on we have normal address_space methods */
+	inode->i_data.a_ops = &udf_aops;
+	up_write(&iinfo->i_data_sem);
+	err = inode->i_data.a_ops->writepage(page, &udf_wbc);
+	if (err) {
+		/* Restore everything back so that we don't lose data... */
+		lock_page(page);
+		kaddr = kmap(page);
+		down_write(&iinfo->i_data_sem);
+		memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
+		       inode->i_size);
+		kunmap(page);
+		unlock_page(page);
+		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
+		inode->i_data.a_ops = &udf_adinicb_aops;
+		up_write(&iinfo->i_data_sem);
+	}
 	page_cache_release(page);
-
 	mark_inode_dirty(inode);
+
+	return err;
 }
 
 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
@@ -290,7 +424,6 @@ static int udf_get_block(struct inode *inode, sector_t block,
 			 struct buffer_head *bh_result, int create)
 {
 	int err, new;
-	struct buffer_head *bh;
 	sector_t phys = 0;
 	struct udf_inode_info *iinfo;
 
@@ -303,30 +436,25 @@ static int udf_get_block(struct inode *inode, sector_t block,
 
 	err = -EIO;
 	new = 0;
-	bh = NULL;
-
-	lock_kernel();
-
 	iinfo = UDF_I(inode);
+
+	down_write(&iinfo->i_data_sem);
 	if (block == iinfo->i_next_alloc_block + 1) {
 		iinfo->i_next_alloc_block++;
 		iinfo->i_next_alloc_goal++;
 	}
 
-	err = 0;
-
-	bh = inode_getblk(inode, block, &err, &phys, &new);
-	BUG_ON(bh);
-	if (err)
+	udf_clear_extent_cache(inode);
+	phys = inode_getblk(inode, block, &err, &new);
+	if (!phys)
 		goto abort;
-	BUG_ON(!phys);
 
 	if (new)
 		set_buffer_new(bh_result);
 	map_bh(bh_result, inode->i_sb, phys);
 
 abort:
-	unlock_kernel();
+	up_write(&iinfo->i_data_sem);
 	return err;
 }
 
@@ -355,8 +483,10 @@ static struct buffer_head *udf_getblk(struct inode *inode, long block,
 }
 
 /* Extend the file by 'blocks' blocks, return the number of extents added */
-int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
-		    struct kernel_long_ad *last_ext, sector_t blocks)
+static int udf_do_extend_file(struct inode *inode,
+			      struct extent_position *last_pos,
+			      struct kernel_long_ad *last_ext,
+			      sector_t blocks)
 {
 	sector_t add;
 	int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
@@ -364,6 +494,7 @@ int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 	struct kernel_lb_addr prealloc_loc = {};
 	int prealloc_len = 0;
 	struct udf_inode_info *iinfo;
+	int err;
 
 	/* The previous extent is fake and we should not extend by anything
 	 * - there's nothing to do... */
@@ -429,26 +560,29 @@ int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 	/* Create enough extents to cover the whole hole */
 	while (blocks > add) {
 		blocks -= add;
-		if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
-				 last_ext->extLength, 1) == -1)
-			return -1;
+		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+				   last_ext->extLength, 1);
+		if (err)
+			return err;
 		count++;
 	}
 	if (blocks) {
 		last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 			(blocks << sb->s_blocksize_bits);
-		if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
-				 last_ext->extLength, 1) == -1)
-			return -1;
+		err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
+				   last_ext->extLength, 1);
+		if (err)
+			return err;
 		count++;
 	}
 
 out:
 	/* Do we have some preallocated blocks saved? */
 	if (prealloc_len) {
-		if (udf_add_aext(inode, last_pos, &prealloc_loc,
-				 prealloc_len, 1) == -1)
-			return -1;
+		err = udf_add_aext(inode, last_pos, &prealloc_loc,
+				   prealloc_len, 1);
+		if (err)
+			return err;
 		last_ext->extLocation = prealloc_loc;
 		last_ext->extLength = prealloc_len;
 		count++;
@@ -460,16 +594,71 @@ out:
 	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 		last_pos->offset -= sizeof(struct long_ad);
 	else
-		return -1;
+		return -EIO;
 
 	return count;
 }
 
-static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
-					int *err, sector_t *phys, int *new)
+static int udf_extend_file(struct inode *inode, loff_t newsize)
+{
+
+	struct extent_position epos;
+	struct kernel_lb_addr eloc;
+	uint32_t elen;
+	int8_t etype;
+	struct super_block *sb = inode->i_sb;
+	sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
+	int adsize;
+	struct udf_inode_info *iinfo = UDF_I(inode);
+	struct kernel_long_ad extent;
+	int err;
+
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
+		adsize = sizeof(struct short_ad);
+	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
+		adsize = sizeof(struct long_ad);
+	else
+		BUG();
+
+	etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
+
+	/* File has extent covering the new size (could happen when extending
+	 * inside a block)? */
+	if (etype != -1)
+		return 0;
+	if (newsize & (sb->s_blocksize - 1))
+		offset++;
+	/* Extended file just to the boundary of the last file block? */
+	if (offset == 0)
+		return 0;
+
+	/* Truncate is extending the file by 'offset' blocks */
+	if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
+	    (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
+		/* File has no extents at all or has empty last
+		 * indirect extent! Create a fake extent... */
+		extent.extLocation.logicalBlockNum = 0;
+		extent.extLocation.partitionReferenceNum = 0;
+		extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
+	} else {
+		epos.offset -= adsize;
+		etype = udf_next_aext(inode, &epos, &extent.extLocation,
+				      &extent.extLength, 0);
+		extent.extLength |= etype << 30;
+	}
+	err = udf_do_extend_file(inode, &epos, &extent, offset);
+	if (err < 0)
+		goto out;
+	err = 0;
+	iinfo->i_lenExtents = newsize;
+out:
+	brelse(epos.bh);
+	return err;
+}
+
+static sector_t inode_getblk(struct inode *inode, sector_t block,
+			     int *err, int *new)
 {
-	static sector_t last_block;
-	struct buffer_head *result = NULL;
 	struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 	struct extent_position prev_epos, cur_epos, next_epos;
 	int count = 0, startnum = 0, endnum = 0;
@@ -483,7 +672,10 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 	struct udf_inode_info *iinfo = UDF_I(inode);
 	int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 	int lastblock = 0;
+	bool isBeyondEOF;
 
+	*err = 0;
+	*new = 0;
 	prev_epos.offset = udf_file_entry_alloc_offset(inode);
 	prev_epos.block = iinfo->i_location;
 	prev_epos.bh = NULL;
@@ -547,21 +739,19 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 			elen = EXT_RECORDED_ALLOCATED |
 				((elen + inode->i_sb->s_blocksize - 1) &
 				 ~(inode->i_sb->s_blocksize - 1));
-			etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
+			udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 		}
 		brelse(prev_epos.bh);
 		brelse(cur_epos.bh);
 		brelse(next_epos.bh);
 		newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
-		*phys = newblock;
-		return NULL;
+		return newblock;
 	}
 
-	last_block = block;
 	/* Are we beyond EOF? */
 	if (etype == -1) {
 		int ret;
-
+		isBeyondEOF = 1;
 		if (count) {
 			if (c)
 				laarr[0] = laarr[1];
@@ -571,20 +761,18 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 			memset(&laarr[0].extLocation, 0x00,
 				sizeof(struct kernel_lb_addr));
 			laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
-			/* Will udf_extend_file() create real extent from
+			/* Will udf_do_extend_file() create real extent from
 			   a fake one? */
 			startnum = (offset > 0);
 		}
 		/* Create extents for the hole between EOF and offset */
-		ret = udf_extend_file(inode, &prev_epos, laarr, offset);
-		if (ret == -1) {
+		ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
+		if (ret < 0) {
 			brelse(prev_epos.bh);
 			brelse(cur_epos.bh);
 			brelse(next_epos.bh);
-			/* We don't really know the error here so we just make
-			 * something up */
-			*err = -ENOSPC;
-			return NULL;
+			*err = ret;
+			return 0;
 		}
 		c = 0;
 		offset = 0;
@@ -601,11 +789,11 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 			memset(&laarr[c].extLocation, 0x00,
 				sizeof(struct kernel_lb_addr));
 			count++;
-			endnum++;
 		}
 		endnum = c + 1;
 		lastblock = 1;
 	} else {
+		isBeyondEOF = 0;
 		endnum = startnum = ((count > 2) ? 2 : count);
 
 		/* if the current extent is in position 0,
@@ -648,10 +836,13 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 				goal, err);
 		if (!newblocknum) {
 			brelse(prev_epos.bh);
+			brelse(cur_epos.bh);
+			brelse(next_epos.bh);
 			*err = -ENOSPC;
-			return NULL;
+			return 0;
 		}
-		iinfo->i_lenExtents += inode->i_sb->s_blocksize;
+		if (isBeyondEOF)
+			iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 	}
 
 	/* if the extent the requsted block is located in contains multiple
@@ -678,13 +869,15 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 	udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 
 	brelse(prev_epos.bh);
+	brelse(cur_epos.bh);
+	brelse(next_epos.bh);
 
 	newblock = udf_get_pblock(inode->i_sb, newblocknum,
 				iinfo->i_location.partitionReferenceNum, 0);
-	if (!newblock)
-		return NULL;
-	*phys = newblock;
-	*err = 0;
+	if (!newblock) {
+		*err = -EIO;
+		return 0;
+	}
 	*new = 1;
 	iinfo->i_next_alloc_block = block;
 	iinfo->i_next_alloc_goal = newblocknum;
@@ -695,7 +888,7 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 	else
 		mark_inode_dirty(inode);
 
-	return result;
+	return newblock;
 }
 
 static void udf_split_extents(struct inode *inode, int *c, int offset,
@@ -1012,50 +1205,70 @@ struct buffer_head *udf_bread(struct inode *inode, int block,
 	return NULL;
 }
 
-void udf_truncate(struct inode *inode)
+int udf_setsize(struct inode *inode, loff_t newsize)
 {
-	int offset;
 	int err;
 	struct udf_inode_info *iinfo;
+	int bsize = 1 << inode->i_blkbits;
 
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 	      S_ISLNK(inode->i_mode)))
-		return;
+		return -EINVAL;
 	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-		return;
+		return -EPERM;
 
-	lock_kernel();
 	iinfo = UDF_I(inode);
-	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
-		if (inode->i_sb->s_blocksize <
-				(udf_file_entry_alloc_offset(inode) +
-				 inode->i_size)) {
-			udf_expand_file_adinicb(inode, inode->i_size, &err);
-			if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
-				inode->i_size = iinfo->i_lenAlloc;
-				unlock_kernel();
-				return;
-			} else
-				udf_truncate_extents(inode);
-		} else {
-			offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
-			memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
-				0x00, inode->i_sb->s_blocksize -
-				offset - udf_file_entry_alloc_offset(inode));
-			iinfo->i_lenAlloc = inode->i_size;
+	if (newsize > inode->i_size) {
+		down_write(&iinfo->i_data_sem);
+		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			if (bsize <
+			    (udf_file_entry_alloc_offset(inode) + newsize)) {
+				err = udf_expand_file_adinicb(inode);
+				if (err)
+					return err;
+				down_write(&iinfo->i_data_sem);
+			} else {
+				iinfo->i_lenAlloc = newsize;
+				goto set_size;
+			}
+		}
+		err = udf_extend_file(inode, newsize);
+		if (err) {
+			up_write(&iinfo->i_data_sem);
+			return err;
 		}
+set_size:
+		truncate_setsize(inode, newsize);
+		up_write(&iinfo->i_data_sem);
 	} else {
-		block_truncate_page(inode->i_mapping, inode->i_size,
-				    udf_get_block);
+		if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+			down_write(&iinfo->i_data_sem);
+			udf_clear_extent_cache(inode);
+			memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
+			       0x00, bsize - newsize -
+			       udf_file_entry_alloc_offset(inode));
+			iinfo->i_lenAlloc = newsize;
+			truncate_setsize(inode, newsize);
+			up_write(&iinfo->i_data_sem);
+			goto update_time;
+		}
+		err = block_truncate_page(inode->i_mapping, newsize,
+					  udf_get_block);
+		if (err)
+			return err;
+		down_write(&iinfo->i_data_sem);
+		udf_clear_extent_cache(inode);
+		truncate_setsize(inode, newsize);
 		udf_truncate_extents(inode);
+		up_write(&iinfo->i_data_sem);
 	}
-
+update_time:
 	inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
 	if (IS_SYNC(inode))
 		udf_sync_inode(inode);
 	else
 		mark_inode_dirty(inode);
-	unlock_kernel();
+	return 0;
 }
 
 static void __udf_read_inode(struct inode *inode)
@@ -1079,16 +1292,15 @@ static void __udf_read_inode(struct inode *inode)
 	 */
 	bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
 	if (!bh) {
-		printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
-		       inode->i_ino);
+		udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
 		make_bad_inode(inode);
 		return;
 	}
 
 	if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
 	    ident != TAG_IDENT_USE) {
-		printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
-				"failed ident=%d\n", inode->i_ino, ident);
+		udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
+			inode->i_ino, ident);
 		brelse(bh);
 		make_bad_inode(inode);
 		return;
@@ -1128,8 +1340,8 @@ static void __udf_read_inode(struct inode *inode)
 		}
 		brelse(ibh);
 	} else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
-		printk(KERN_ERR "udf: unsupported strategy type: %d\n",
-		       le16_to_cpu(fe->icbTag.strategyType));
+		udf_err(inode->i_sb, "unsupported strategy type: %d\n",
+			le16_to_cpu(fe->icbTag.strategyType));
 		brelse(bh);
 		make_bad_inode(inode);
 		return;
@@ -1143,9 +1355,9 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 {
 	struct fileEntry *fe;
 	struct extendedFileEntry *efe;
-	int offset;
 	struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
 	struct udf_inode_info *iinfo = UDF_I(inode);
+	unsigned int link_count;
 
 	fe = (struct fileEntry *)bh->b_data;
 	efe = (struct extendedFileEntry *)bh->b_data;
@@ -1204,25 +1416,19 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		return;
 	}
 
-	inode->i_uid = le32_to_cpu(fe->uid);
-	if (inode->i_uid == -1 ||
+	read_lock(&sbi->s_cred_lock);
+	i_uid_write(inode, le32_to_cpu(fe->uid));
+	if (!uid_valid(inode->i_uid) ||
 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
 		inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
 
-	inode->i_gid = le32_to_cpu(fe->gid);
-	if (inode->i_gid == -1 ||
+	i_gid_write(inode, le32_to_cpu(fe->gid));
+	if (!gid_valid(inode->i_gid) ||
 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
 	    UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
 		inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
 
-	inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
-	if (!inode->i_nlink)
-		inode->i_nlink = 1;
-
-	inode->i_size = le64_to_cpu(fe->informationLength);
-	iinfo->i_lenExtents = inode->i_size;
-
 	if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
 			sbi->s_fmode != UDF_INVALID_MODE)
 		inode->i_mode = sbi->s_fmode;
@@ -1232,6 +1438,15 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 	else
 		inode->i_mode = udf_convert_permissions(fe);
 	inode->i_mode &= ~sbi->s_umask;
+	read_unlock(&sbi->s_cred_lock);
+
+	link_count = le16_to_cpu(fe->fileLinkCount);
+	if (!link_count)
+		link_count = 1;
+	set_nlink(inode, link_count);
+
+	inode->i_size = le64_to_cpu(fe->informationLength);
+	iinfo->i_lenExtents = inode->i_size;
 
 	if (iinfo->i_efe == 0) {
 		inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
@@ -1250,7 +1465,7 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		iinfo->i_unique = le64_to_cpu(fe->uniqueID);
 		iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
 		iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
-		offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
+		iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
 	} else {
 		inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
 		    (inode->i_sb->s_blocksize_bits - 9);
@@ -1271,8 +1486,7 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		iinfo->i_unique = le64_to_cpu(efe->uniqueID);
 		iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
 		iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
-		offset = sizeof(struct extendedFileEntry) +
-							iinfo->i_lenEAttr;
+		iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
 	}
 
 	switch (fe->icbTag.fileType) {
@@ -1308,7 +1522,7 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		break;
 	case ICBTAG_FILE_TYPE_SYMLINK:
 		inode->i_data.a_ops = &udf_symlink_aops;
-		inode->i_op = &page_symlink_inode_operations;
+		inode->i_op = &udf_symlink_inode_operations;
 		inode->i_mode = S_IFLNK | S_IRWXUGO;
 		break;
 	case ICBTAG_FILE_TYPE_MAIN:
@@ -1321,9 +1535,8 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 		udf_debug("METADATA BITMAP FILE-----\n");
 		break;
 	default:
-		printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
-				"file type=%d\n", inode->i_ino,
-				fe->icbTag.fileType);
+		udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
+			inode->i_ino, fe->icbTag.fileType);
 		make_bad_inode(inode);
 		return;
 	}
@@ -1346,17 +1559,17 @@ static int udf_alloc_i_data(struct inode *inode, size_t size)
 	iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
 
 	if (!iinfo->i_ext.i_data) {
-		printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
-				"no free memory\n", inode->i_ino);
+		udf_err(inode->i_sb, "(ino %ld) no free memory\n",
+			inode->i_ino);
 		return -ENOMEM;
 	}
 
 	return 0;
 }
 
-static mode_t udf_convert_permissions(struct fileEntry *fe)
+static umode_t udf_convert_permissions(struct fileEntry *fe)
 {
-	mode_t mode;
+	umode_t mode;
 	uint32_t permissions;
 	uint32_t flags;
 
@@ -1373,18 +1586,12 @@ static mode_t udf_convert_permissions(struct fileEntry *fe)
 	return mode;
 }
 
-int udf_write_inode(struct inode *inode, int sync)
+int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
 {
-	int ret;
-
-	lock_kernel();
-	ret = udf_update_inode(inode, sync);
-	unlock_kernel();
-
-	return ret;
+	return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 }
 
-int udf_sync_inode(struct inode *inode)
+static int udf_sync_inode(struct inode *inode)
 {
 	return udf_update_inode(inode, 1);
 }
@@ -1394,6 +1601,7 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 	struct buffer_head *bh = NULL;
 	struct fileEntry *fe;
 	struct extendedFileEntry *efe;
+	uint64_t lb_recorded;
 	uint32_t udfperms;
 	uint16_t icbflags;
 	uint16_t crclen;
@@ -1402,20 +1610,19 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 	unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 	struct udf_inode_info *iinfo = UDF_I(inode);
 
-	bh = udf_tread(inode->i_sb,
-			udf_get_lb_pblock(inode->i_sb,
-					  &iinfo->i_location, 0));
+	bh = udf_tgetblk(inode->i_sb,
+			udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
 	if (!bh) {
-		udf_debug("bread failure\n");
-		return -EIO;
+		udf_debug("getblk failure\n");
+		return -ENOMEM;
 	}
 
-	memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
-
+	lock_buffer(bh);
+	memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 	fe = (struct fileEntry *)bh->b_data;
 	efe = (struct extendedFileEntry *)bh->b_data;
 
-	if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
+	if (iinfo->i_use) {
 		struct unallocSpaceEntry *use =
 			(struct unallocSpaceEntry *)bh->b_data;
 
@@ -1423,31 +1630,29 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 		memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
 		       iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
 					sizeof(struct unallocSpaceEntry));
+		use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
+		use->descTag.tagLocation =
+				cpu_to_le32(iinfo->i_location.logicalBlockNum);
 		crclen = sizeof(struct unallocSpaceEntry) +
 				iinfo->i_lenAlloc - sizeof(struct tag);
-		use->descTag.tagLocation = cpu_to_le32(
-						iinfo->i_location.
-							logicalBlockNum);
 		use->descTag.descCRCLength = cpu_to_le16(crclen);
 		use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
 							   sizeof(struct tag),
 							   crclen));
 		use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
 
-		mark_buffer_dirty(bh);
-		brelse(bh);
-		return err;
+		goto out;
 	}
 
 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
 		fe->uid = cpu_to_le32(-1);
 	else
-		fe->uid = cpu_to_le32(inode->i_uid);
+		fe->uid = cpu_to_le32(i_uid_read(inode));
 
 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
 		fe->gid = cpu_to_le32(-1);
 	else
-		fe->gid = cpu_to_le32(inode->i_gid);
+		fe->gid = cpu_to_le32(i_gid_read(inode));
 
 	udfperms = ((inode->i_mode & S_IRWXO)) |
 		   ((inode->i_mode & S_IRWXG) << 2) |
@@ -1491,13 +1696,18 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 		dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
 	}
 
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
+		lb_recorded = 0; /* No extents => no blocks! */
+	else
+		lb_recorded =
+			(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
+			(blocksize_bits - 9);
+
 	if (iinfo->i_efe == 0) {
 		memcpy(bh->b_data + sizeof(struct fileEntry),
 		       iinfo->i_ext.i_data,
 		       inode->i_sb->s_blocksize - sizeof(struct fileEntry));
-		fe->logicalBlocksRecorded = cpu_to_le64(
-			(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
-			(blocksize_bits - 9));
+		fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
 
 		udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
 		udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
@@ -1509,6 +1719,7 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 		fe->uniqueID = cpu_to_le64(iinfo->i_unique);
 		fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
 		fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+		fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
 		fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
 		crclen = sizeof(struct fileEntry);
 	} else {
@@ -1517,9 +1728,7 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 		       inode->i_sb->s_blocksize -
 					sizeof(struct extendedFileEntry));
 		efe->objectSize = cpu_to_le64(inode->i_size);
-		efe->logicalBlocksRecorded = cpu_to_le64(
-			(inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
-			(blocksize_bits - 9));
+		efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
 
 		if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
 		    (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
@@ -1548,6 +1757,7 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 		efe->uniqueID = cpu_to_le64(iinfo->i_unique);
 		efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
 		efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
+		efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
 		efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
 		crclen = sizeof(struct extendedFileEntry);
 	}
@@ -1591,21 +1801,23 @@ static int udf_update_inode(struct inode *inode, int do_sync)
 	fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
 	fe->descTag.tagLocation = cpu_to_le32(
 					iinfo->i_location.logicalBlockNum);
-	crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
-								sizeof(struct tag);
+	crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
 	fe->descTag.descCRCLength = cpu_to_le16(crclen);
 	fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
 						  crclen));
 	fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
 
+out:
+	set_buffer_uptodate(bh);
+	unlock_buffer(bh);
+
 	/* write the data blocks */
 	mark_buffer_dirty(bh);
 	if (do_sync) {
 		sync_dirty_buffer(bh);
-		if (buffer_req(bh) && !buffer_uptodate(bh)) {
-			printk(KERN_WARNING "IO error syncing udf inode "
-				"[%s:%08lx]\n", inode->i_sb->s_id,
-				inode->i_ino);
+		if (buffer_write_io_error(bh)) {
+			udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
+				 inode->i_ino);
 			err = -EIO;
 		}
 	}
@@ -1646,14 +1858,13 @@ struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
 	return NULL;
 }
 
-int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
-		    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+int udf_add_aext(struct inode *inode, struct extent_position *epos,
+		 struct kernel_lb_addr *eloc, uint32_t elen, int inc)
 {
 	int adsize;
 	struct short_ad *sad = NULL;
 	struct long_ad *lad = NULL;
 	struct allocExtDesc *aed;
-	int8_t etype;
 	uint8_t *ptr;
 	struct udf_inode_info *iinfo = UDF_I(inode);
 
@@ -1669,10 +1880,10 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
 	else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 		adsize = sizeof(struct long_ad);
 	else
-		return -1;
+		return -EIO;
 
 	if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
-		char *sptr, *dptr;
+		unsigned char *sptr, *dptr;
 		struct buffer_head *nbh;
 		int err, loffset;
 		struct kernel_lb_addr obloc = epos->block;
@@ -1681,12 +1892,12 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
 						obloc.partitionReferenceNum,
 						obloc.logicalBlockNum, &err);
 		if (!epos->block.logicalBlockNum)
-			return -1;
+			return -ENOSPC;
 		nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
 								 &epos->block,
 								 0));
 		if (!nbh)
-			return -1;
+			return -EIO;
 		lock_buffer(nbh);
 		memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
 		set_buffer_uptodate(nbh);
@@ -1755,7 +1966,7 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
 		epos->bh = nbh;
 	}
 
-	etype = udf_write_aext(inode, epos, eloc, elen, inc);
+	udf_write_aext(inode, epos, eloc, elen, inc);
 
 	if (!epos->bh) {
 		iinfo->i_lenAlloc += adsize;
@@ -1773,11 +1984,11 @@ int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
 		mark_buffer_dirty_inode(epos->bh, inode);
 	}
 
-	return etype;
+	return 0;
 }
 
-int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
-		      struct kernel_lb_addr *eloc, uint32_t elen, int inc)
+void udf_write_aext(struct inode *inode, struct extent_position *epos,
+		    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
 {
 	int adsize;
 	uint8_t *ptr;
@@ -1807,7 +2018,7 @@ int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
 		adsize = sizeof(struct long_ad);
 		break;
 	default:
-		return -1;
+		return;
 	}
 
 	if (epos->bh) {
@@ -1826,8 +2037,6 @@ int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
 
 	if (inc)
 		epos->offset += adsize;
-
-	return (elen >> 30);
 }
 
 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
@@ -1899,8 +2108,7 @@ int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
 		*elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
 		break;
 	default:
-		udf_debug("alloc_type = %d unsupported\n",
-				iinfo->i_alloc_type);
+		udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
 		return -1;
 	}
 
@@ -2022,11 +2230,12 @@ int8_t inode_bmap(struct inode *inode, sector_t block,
 	struct udf_inode_info *iinfo;
 
 	iinfo = UDF_I(inode);
-	pos->offset = 0;
-	pos->block = iinfo->i_location;
-	pos->bh = NULL;
+	if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
+		pos->offset = 0;
+		pos->block = iinfo->i_location;
+		pos->bh = NULL;
+	}
 	*elen = 0;
-
 	do {
 		etype = udf_next_aext(inode, pos, eloc, elen, 1);
 		if (etype == -1) {
@@ -2036,7 +2245,8 @@ int8_t inode_bmap(struct inode *inode, sector_t block,
 		}
 		lbcount += *elen;
 	} while (lbcount <= bcount);
-
+	/* update extent cache */
+	udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
 	*offset = (bcount + *elen - lbcount) >> blocksize_bits;
 
 	return etype;
@@ -2050,7 +2260,7 @@ long udf_block_map(struct inode *inode, sector_t block)
 	struct extent_position epos = {};
 	int ret;
 
-	lock_kernel();
+	down_read(&UDF_I(inode)->i_data_sem);
 
 	if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
 						(EXT_RECORDED_ALLOCATED >> 30))
@@ -2058,7 +2268,7 @@ long udf_block_map(struct inode *inode, sector_t block)
 	else
 		ret = 0;
 
-	unlock_kernel();
+	up_read(&UDF_I(inode)->i_data_sem);
 	brelse(epos.bh);
 
 	if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))