def create(self, path, mode):
self.files[path] = dict(st_mode=(S_IFREG | mode),
st_nlink=1,
st_size=0,
st_ctime=time(),
st_mtime=time(),
st_atime=time())
name = path
mode = self.files[path].get('st_mode')
ctime = self.files[path].get('st_ctime')
mtime = self.files[path].get('st_mtime')
atime = self.files[path].get('st_atime')
nlink = self.files[path].get('st_nlink')
size = self.files[path].get('st_size')
uid = os.getuid()
gid = os.getgid()
self.chown(path, uid, gid)
# get free block for the new created file to save the metadata.
num_array = Format.get_free_block(Format, 1)
block_num = num_array[0]
# set up the location in the disk
inode_data = Format.set_inode(Format, name, mode, ctime, mtime, atime,
nlink, uid, gid, size, block_num)
disktools.write_block(block_num, inode_data)
# update the free block bitmap
Format.update_bit_map(Format, num_array)
self.fd += 1
return self.fd
def mkdir(self, path, mode):
self.files[path] = dict(st_mode=(S_IFDIR | mode),
st_nlink=2,
st_size=0,
st_ctime=time(),
st_mtime=time(),
st_atime=time())
name = path
mode = self.files[path].get('st_mode')
ctime = self.files[path].get('st_ctime')
mtime = self.files[path].get('st_mtime')
atime = self.files[path].get('st_atime')
nlink = self.files[path].get('st_nlink')
size = self.files[path].get('st_size')
uid = os.getuid()
gid = os.getgid()
self.chown(path, uid, gid)
# get free block for the new created file to save the metadata.
num_array = Format.get_free_block(Format, 1)
block_num = num_array[0]
# set up the location in the disk
inode_data = Format.set_inode(Format, name, mode, ctime, mtime, atime,
nlink, uid, gid, size, block_num)
disktools.write_block(block_num, inode_data)
# update the free block bitmap
Format.update_bit_map(Format, num_array)
# find the parent path and add the nlink by 1.
parent_path = Format.find_parent_path(Format, path)
self.files[parent_path]['st_nlink'] += 1
Format.update_nlink(Format, parent_path, 1)
def write(self, path, data, offset, fh):
self.data[path] = (
# make sure the data gets inserted at the right offset
self.data[path][:offset].ljust(offset, '\x00'.encode('ascii')) +
data
# and only overwrites the bytes that data is replacing
+ self.data[path][offset + len(data):])
self.files[path]['st_size'] = len(self.data[path])
# get the length of input data
size = len(self.data[path])
# calculate the number of blocks that need to store the data
no_of_blocks = (size // BLOCK_SIZE) + 1
# get the free blocks
num_array = Format.get_free_block(Format, no_of_blocks)
Format.clear_data_block(Format, path)
# set the data block bitmap
data_block_bitmap = Format.set_data_block_bitmap(Format, num_array)
# get the input data
input_data = self.data[path]
# save the data to disk into the allocated blocks
for i in range(no_of_blocks):
if no_of_blocks == 1:
disktools.write_block(num_array[i], input_data)
else:
disktools.write_block(num_array[i],
input_data[i * 64:i * 64 + 64])
# Add the data block bitmap into the metadata information
Format.update_file_location(Format, path, data_block_bitmap)
# update the st_size in the metadata
Format.update_size(Format, path, self.files[path]['st_size'])
# update the st_mtime in the metadata
Format.update_mtime(Format, path, int(time()))
# update the free block bitmap
Format.update_bit_map(Format, num_array)
return len(data)
