def open(self, path, isdir=False):
inode_no = self.search_dir(path)
if inode_no is None:
raise Exception("path does not exist")
if isdir:
return Directory(inode_no)
else:
return File(inode_no)
def unlink(self, path):
filename = find_filename(path)
parent_inode_no = self.search_dir(find_parent(path))
parent_inode_block = inodemap.inodemap.lookup(parent_inode_no)
parent_inode = Inode(data=segment.segman.block_read(parent_inode_block))
parent_old_size = parent_inode.filesize
parent_dir = Directory(parent_inode_no)
found_entry = False
entries = []
for (name, inode) in parent_dir.enumerate():
if found_entry:
entries.append((name, inode))
if name == filename:
fount = True
position = parent_dir.position - (FILENAMELEN + 4)
for (name, inode) in entries:
parent_inode.write(position, struct.pack("%dsI" % FILENAMELEN, name, inode))
position += FILENAMELEN + 4
parent_inode.filesize = parent_old_size - (FILENAMELEN + 4)
inodemap.inodemap.update_inode(parent_inode_no, parent_inode.serialize())
def search_dir(self, path):
# print map(ord, path)
path = path.strip()
if path == "/":
return 1
current_dir = Directory(1)
stack = path.split("/")[1:]
stack.reverse()
while True:
name = stack.pop()
found = False
for (n, inode) in current_dir.enumerate():
if n == name:
found = True
break
if found:
if len(stack) == 0:
return inode
else:
current_dir = Directory(inode)
else:
return None
def search_dir(self, path):
#print map(ord, path)
path = path.strip()
if path == "/":
return 1
current_dir = Directory(1)
stack = path.split("/")[1:]
stack.reverse()
while True:
name = stack.pop()
found = False
for (n, inode) in current_dir.enumerate():
if n == name:
found = True
break
if found:
if len(stack) == 0:
return inode
else:
current_dir = Directory(inode)
else:
return None
def unlink(self, path):
filename = find_filename(path)
parent_inode_no = self.search_dir(find_parent(path))
parent_inode_block = inodemap.inodemap.lookup(parent_inode_no)
parent_inode = Inode(
data=segment.segman.block_read(parent_inode_block))
parent_old_size = parent_inode.filesize
parent_dir = Directory(parent_inode_no)
found_entry = False
entries = []
for (name, inode) in parent_dir.enumerate():
if found_entry:
entries.append((name, inode))
if name == filename:
fount = True
position = parent_dir.position - (FILENAMELEN + 4)
for (name, inode) in entries:
parent_inode.write(position,
struct.pack("%dsI" % FILENAMELEN, name, inode))
position += (FILENAMELEN + 4)
parent_inode.filesize = parent_old_size - (FILENAMELEN + 4)
inodemap.inodemap.update_inode(parent_inode_no,
parent_inode.serialize())
def create(self, filename, isdir=False):
inode_no = self.search_dir(filename)
if inode_no is not None:
raise Exception("file already exists")
inode = Inode(isdir=isdir)
parent_dir = find_parent(filename)
parent_inode_no = self.search_dir(parent_dir)
if parent_inode_no is None:
raise Exception("parent direntory does not exist")
parent_inode_block = inodemap.inodemap.lookup(parent_inode_no)
parent_inode = Inode(
data=segment.segman.block_read(parent_inode_block))
self.append_entry(parent_inode, find_filename(filename), inode)
if isdir:
return Directory(inode.id)
else:
return File(inode.id)
