def write_inode(nbr, data):
assert (dk.file_name != None), "NO DISK OPEN"
assert (len(data) == 8), "Inode has 8 fields, not {}".format(len(data))
sb = sfs.get_superblock()
inode_block, inode_start = divmod(nbr, sfs.INODES_PER_BLOCK)
assert (inode_block >= 0 and inode_block < sfs.INODE_BLOCK_COUNT * sfs.INODES_PER_BLOCK), "Invalid inode requested"
ib = dk.disk_read(inode_block + sb[8])
for v in data:
inode_start = sfs.add_field(ib, v, inode_start)
dk.disk_write(inode_block + sb[8], ib)
ibp.set_used(nbr)
def write_buffer():
global buffer
if buffer is None:
print(noBuffer)
return
block = get_number("Which block on that disk?")
as_byte_array = bytearray(buffer)
try:
dk.disk_write(block, as_byte_array)
print("Wrote from buffer to disk.")
except Exception as e:
print(e)
def empty_inode_blocks():
sb = get_superblock()
for i in range(INODE_BLOCK_COUNT):
# i + sb[8] to skip over the superblock
data = dk.disk_read(i + sb[8])
field = 0
for i in range(INODES_PER_BLOCK):
# "isvalid" field
field = add_field(data, INVALID_INODE, field)
# "size" field
field = add_field(data, INODE_SIZE, field)
# dir1,...dir5, indir
for i in range(6):
field = add_field(data, 0, field)
dk.disk_write(i + sb[8], data)
def write_dir(inode, name, file=True):
assert (dk.file_name != None), "NO DISK OPEN"
if file:
name = "f{}".format(name)
else:
name = "d{}".format(name)
# Gets dir tuples and replaces one
sb = sfs.get_superblock()
dirs = get_dirs()
for i, v in enumerate(dirs):
if v[0] == sfs.INVALID_INODE:
dirs[i] = (inode, name)
break
data, dblock = get_dir_block()
field = 0
for i in dirs:
field = sfs.add_field(data, i[0], field)
field = sfs.add_string(data, i[1], field, 28)
dk.disk_write(dblock + sb[7], data)
def superblock():
# Gets data
data = dk.disk_read(0)
# Keeps track of which field writing to
field = 0
# Adds magic numbers - 0
field = add_field(data, MAGIC, field)
# Writes number of blocks - 1
field = add_field(data, dk.NUMBER_OF_BLOCKS, field)
# Adds ninodeblocks - 2
field = add_field(data, INODE_BLOCK_COUNT, field)
# Adds ninodes - 3
field = add_field(data, INODES_PER_BLOCK, field)
# Adds dentry - 4
field = add_field(data, 1, field)
# datablock bitmap - 5
field = add_field(data, 1, field)
# inode bitmap - 6
field = add_field(data, 2, field)
# first datablock - 7
field = add_field(data, 3 + INODE_BLOCK_COUNT, field)
# first inode block - 8
field = add_field(data, 3, field)
# Writes data
dk.disk_write(0, data)
def save_to_disk():
global ibitmap
assert(ibitmap != None), NO_BITMAP
superblock = sfs.get_superblock()
ibitmap_block = superblock[6]
dk.disk_write(ibitmap_block, ibitmap)
def save_to_disk():
global bitmap
assert (bitmap != None), NO_BITMAP
superblock = sfs.get_superblock()
bitmap_block = superblock[5]
dk.disk_write(bitmap_block, bitmap)
def write_buffer(ctx, filename, block):
as_byte_array = bytearray(ctx.obj)
result = dk.disk_write(filename, block, as_byte_array)
if result == dk.SUCCESS:
click.echo("Successfully wrote buffer to block {} in disk {}".format(
block, filename))