def get_dir_block():
assert (dk.file_name != None), "NO DISK OPEN"
sb = sfs.get_superblock()
dentry = sb[4]
dinode = ih.get_inode(dentry)[2]
dblock = ih.get_inode(dinode)[2]
data = dk.disk_read(dblock + sb[7])
return data, dblock
def get_inode(nbr):
assert (dk.file_name != None), "NO DISK OPEN"
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: {}".format(nbr)
ib = dk.disk_read(inode_block + sb[8])
result = []
for i in range(8):
result.append(sfs.bytes_to_int(ib, inode_start + (i * sfs.FIELD_LENGTH)))
return result
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 print_bitmap():
global ibitmap
assert(ibitmap != None), NO_BITMAP
cols = 8
superblock = sfs.get_superblock()
nbr_inodes = superblock[2] * superblock[3]
print("INODE BITMAP: 0 = UNUSED, 1 = USED, 2 = BAD")
string = ""
for i in range(nbr_inodes):
string += str(ibitmap[i])
if i > 0 and i % cols == 0 and i < nbr_inodes - 1:
print(string)
string = ""
else:
string += ", "
def print_bitmap():
global bitmap
assert (bitmap != None), NO_BITMAP
cols = 8
superblock = sfs.get_superblock()
nbr_blocks = superblock[1]
print("BITMAP: 0 = UNUSED, 1 = USED, 2 = BAD")
string = ""
for i in range(nbr_blocks):
string += str(bitmap[i])
if i > 0 and i % cols == 0 and i < nbr_blocks - 1:
print(string)
string = ""
else:
string += ", "
def init():
global ibitmap
superblock = sfs.get_superblock()
ibitmap_block = superblock[6]
ibitmap = dk.disk_read(ibitmap_block)
# First inode is bad
ibitmap[0] = BAD
total_inodes = superblock[2] * superblock[3]
for i in range(1, total_inodes):
inode = ih.get_inode(i)
read_inode(inode, i)
# Inodes outside range
for i in range(total_inodes, len(ibitmap)):
ibitmap[i] = BAD
print("Inode bitmap created on block 2")
save_to_disk()
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 init():
global bitmap
superblock = sfs.get_superblock()
bitmap_block = superblock[5]
bitmap = dk.disk_read(bitmap_block)
# Always used, meta-blocks
datablock_start = superblock[7]
for i in range(datablock_start):
bitmap[i] = USED
# Data blocks
total_inodes = superblock[2] * superblock[3]
for i in range(total_inodes):
inode = ih.get_inode(i)
read_inode(inode)
# Blocks outside range
for i in range(superblock[1], len(bitmap)):
bitmap[i] = BAD
print("Block bitmap created on block 1")
save_to_disk()
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)