Fix for issue utsaslab#4. For strict mode, during overwrite, the i_bl…

…ocks are being subtracted more times than required, causing problems in truncate. Correctly decrementing i_blocks fixes the issue

Linux-5.1/fs/winefs/inode.c

@@ -833,13 +833,6 @@ static int recursive_alloc_blocks(pmfs_transaction_t *trans,
 					blocknr++;
 				}
 
-				if (free_blk_list != NULL && (*num_free_blks != 0)) {
-					unsigned int data_bits = blk_type_to_shift[pi->i_blk_type];
-					pmfs_memunlock_inode(sb, pi);
-					pi->i_blocks -= ((*num_free_blks) <<
-							 (data_bits - sb->s_blocksize_bits));
-					pmfs_memunlock_inode(sb, pi);
-				}
 				pmfs_memlock_block(sb, node);
 				i += allocated;
 			} else {
@@ -890,6 +883,16 @@ static int recursive_alloc_blocks(pmfs_transaction_t *trans,
 		}
 	}
 
+	if (height == 1) {
+	        if (free_blk_list != NULL && (*num_free_blks != 0)) {
+		        unsigned int data_bits = blk_type_to_shift[pi->i_blk_type];
+			pmfs_memunlock_inode(sb, pi);
+			pi->i_blocks -= ((*num_free_blks) <<
+					 (data_bits - sb->s_blocksize_bits));
+			pmfs_memunlock_inode(sb, pi);
+		}
+	}
+
 	if (new_node || trans == NULL) {
 		/* if the changes were not logged, flush the cachelines we may
 	 	* have modified */