[PATCH] ufs: missed brelse and wrong baseblk

This patch fixes two bugs, which introduced by previous patches:

1) Missed "brelse"

2) Sometimes "baseblk" may be wrongly calculated, if i_size is equal to
   zero, which lead infinite cycle in "mpage_writepages".
Signed-off-by: NEvgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/ufs/balloc.c

@@ -269,20 +269,17 @@ static struct page *ufs_get_locked_page(struct address_space *mapping,
  * We can come here from ufs_writepage or ufs_prepare_write,
  * locked_page is argument of these functions, so we already lock it.
  */
-static void ufs_change_blocknr(struct inode *inode, unsigned int count,
-			       unsigned int oldb, unsigned int newb,
-			       struct page *locked_page)
+static void ufs_change_blocknr(struct inode *inode, unsigned int baseblk,
+			       unsigned int count, unsigned int oldb,
+			       unsigned int newb, struct page *locked_page)
 {
 	unsigned int blk_per_page = 1 << (PAGE_CACHE_SHIFT - inode->i_blkbits);
-	sector_t baseblk;
 	struct address_space *mapping = inode->i_mapping;
 	pgoff_t index, cur_index = locked_page->index;
 	unsigned int i, j;
 	struct page *page;
 	struct buffer_head *head, *bh;
 
-	baseblk = ((i_size_read(inode) - 1) >> inode->i_blkbits) + 1 - count;
-
 	UFSD("ENTER, ino %lu, count %u, oldb %u, newb %u\n",
 	      inode->i_ino, count, oldb, newb);
 
@@ -439,7 +436,8 @@ unsigned ufs_new_fragments(struct inode * inode, __fs32 * p, unsigned fragment,
 	}
 	result = ufs_alloc_fragments (inode, cgno, goal, request, err);
 	if (result) {
-		ufs_change_blocknr(inode, oldcount, tmp, result, locked_page);
+		ufs_change_blocknr(inode, fragment - oldcount, oldcount, tmp,
+				   result, locked_page);
 
 		*p = cpu_to_fs32(sb, result);
 		*err = 0;

fs/ufs/inode.c

@@ -175,6 +175,7 @@ ufs_clear_frags(struct inode *inode, sector_t beg,
 	for (++beg; beg < end; ++beg) {
 		bh = sb_getblk(inode->i_sb, beg);
 		ufs_clear_frag(inode, bh);
+		brelse(bh);
 	}
 	return res;
 }