def _dircache_add_block(self, update_myself):
# allocate block
blk_nums = self.volume.bitmap.alloc_n(1)
if blk_nums == None:
return None
# setup dir cache block
dcb_num = blk_nums[0]
dcb = DirCacheBlock(self.blkdev, dcb_num)
dcb.create(parent=self.block.blk_num)
# link new cache block
if len(self.dcache_blks) == 0:
self.block.extension = dcb_num
if update_myself:
self.block.write()
else:
last_dcb = self.dcache_blks[-1]
last_dcb.next_cache = dcb_num
last_dcb.write()
self.dcache_blks.append(dcb)
return dcb
def read(self, recursive=False):
self._init_name_hash()
self.entries = []
# create initial list with blk_num/hash_index for dir scan
blocks = []
for i in xrange(self.block.hash_size):
blk_num = self.block.hash_table[i]
if blk_num != 0:
blocks.append((blk_num,i))
for blk_num,hash_idx in blocks:
# read anonymous block
blk = Block(self.blkdev, blk_num)
blk.read()
if not blk.valid:
self.valid = False
return
# create file/dir node
hash_chain,node = self._read_add_node(blk, recursive)
# store node in entries
self.entries.append(node)
# store node in name_hash
self.name_hash[hash_idx].append(node)
# follow hash chain
if hash_chain != 0:
blocks.append((hash_chain,hash_idx))
# dircaches available?
if self.volume.is_dircache:
self.dcache_blks = []
dcb_num = self.block.extension
while dcb_num != 0:
dcb = DirCacheBlock(self.blkdev, dcb_num)
dcb.read()
if not dcb.valid:
self.valid = False
return
self.dcache_blks.append(dcb)
dcb_num = dcb.next_cache
