[PATCH] udf patch for 2.5.7-pre1 (part 3/4)

This patch fixes an extent preallocation bug and adds missing sb_bread == NULL
checks.

fs/udf/file.c

@@ -50,6 +50,7 @@ static int udf_adinicb_readpage(struct file *file, struct page * page)
 	struct buffer_head *bh;
 	int block;
 	char *kaddr;
+	int err = 0;
 
 	if (!PageLocked(page))
 		PAGE_BUG(page);
@@ -58,13 +59,20 @@ static int udf_adinicb_readpage(struct file *file, struct page * page)
 	memset(kaddr, 0, PAGE_CACHE_SIZE);
 	block = udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0);
 	bh = sb_bread(inode->i_sb, block);
+	if (!bh)
+	{
+		SetPageError(page);
+		err = -EIO;
+		goto out;
+	}
 	memcpy(kaddr, bh->b_data + udf_ext0_offset(inode), inode->i_size);
 	brelse(bh);
 	flush_dcache_page(page);
 	SetPageUptodate(page);
+out:
 	kunmap(page);
 	UnlockPage(page);
-	return 0;
+	return err;
 }
 
 static int udf_adinicb_writepage(struct page *page)
@@ -74,6 +82,7 @@ static int udf_adinicb_writepage(struct page *page)
 	struct buffer_head *bh;
 	int block;
 	char *kaddr;
+	int err = 0;
 
 	if (!PageLocked(page))
 		PAGE_BUG(page);
@@ -81,13 +90,20 @@ static int udf_adinicb_writepage(struct page *page)
 	kaddr = kmap(page);
 	block = udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0);
 	bh = sb_bread(inode->i_sb, block);
+	if (!bh)
+	{
+		SetPageError(page);
+		err = -EIO;
+		goto out;
+	}
 	memcpy(bh->b_data + udf_ext0_offset(inode), kaddr, inode->i_size);
 	mark_buffer_dirty(bh);
 	brelse(bh);
 	SetPageUptodate(page);
+out:
 	kunmap(page);
 	UnlockPage(page);
-	return 0;
+	return err;
 }
 
 static int udf_adinicb_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
@@ -103,19 +119,27 @@ static int udf_adinicb_commit_write(struct file *file, struct page *page, unsign
 	struct buffer_head *bh;
 	int block;
 	char *kaddr = page_address(page);
+	int err = 0;
 
 	block = udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0);
 	bh = sb_bread(inode->i_sb, block);
+	if (!bh)
+	{
+		SetPageError(page);
+		err = -EIO;
+		goto out;
+	}
 	memcpy(bh->b_data + udf_file_entry_alloc_offset(inode) + offset,
-		kaddr + offset, to-offset);
+		kaddr + offset, to - offset);
 	mark_buffer_dirty(bh);
 	brelse(bh);
 	SetPageUptodate(page);
+out:
 	kunmap(page);
 	/* only one page here */
 	if (to > inode->i_size)
 		inode->i_size = to;
-	return 0;
+	return err;
 }
 
 struct address_space_operations udf_adinicb_aops = {

fs/udf/inode.c

@@ -83,9 +83,6 @@ void udf_put_inode(struct inode * inode)
 	{
 		lock_kernel();
 		udf_discard_prealloc(inode);
-		/* write the root inode on put, if dirty */
-		if (!inode->i_sb->s_root && inode->i_state & I_DIRTY)
-			udf_update_inode(inode, IS_SYNC(inode));
 		unlock_kernel();
 	}
 }
@@ -703,7 +700,6 @@ static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 
 		if (numalloc)
 		{
-			UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
 			if (start == (c+1))
 				laarr[start].extLength +=
 					(numalloc << inode->i_sb->s_blocksize_bits);
@@ -727,7 +723,7 @@ static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 
 				if (elen > numalloc)
 				{
-					laarr[c+1].extLength -=
+					laarr[c].extLength -=
 						(numalloc << inode->i_sb->s_blocksize_bits);
 					numalloc = 0;
 				}
@@ -741,6 +737,7 @@ static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 					(*endnum) --;
 				}
 			}
+			UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
 		}
 	}
 }
@@ -1349,6 +1346,7 @@ udf_update_inode(struct inode *inode, int do_sync)
 		use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
 		crclen = sizeof(struct UnallocatedSpaceEntry) + UDF_I_LENALLOC(inode) -
 			sizeof(tag);
+		use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
 		use->descTag.descCRCLength = cpu_to_le16(crclen);
 		use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));
 

fs/udf/truncate.c

@@ -41,7 +41,13 @@ static void extent_trunc(struct inode * inode, lb_addr bloc, int extoffset,
 
 	if (nelen)
 	{
-		neloc = eloc;
+		if (etype == EXTENT_NOT_RECORDED_ALLOCATED)
+		{
+			udf_free_blocks(inode->i_sb, inode, eloc, 0, last_block);
+			etype = EXTENT_NOT_RECORDED_NOT_ALLOCATED;
+		}
+		else
+			neloc = eloc;
 		nelen = (etype << 30) | nelen;
 	}