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# test making a FAT filesystem on a very large block device
try:
import uos
except ImportError:
print("SKIP")
raise SystemExit
try:
uos.VfsFat
except AttributeError:
print("SKIP")
raise SystemExit
class RAMBDevSparse:
SEC_SIZE = 512
def __init__(self, blocks):
self.blocks = blocks
self.data = {}
def readblocks(self, n, buf):
# print("readblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
assert len(buf) == self.SEC_SIZE
if n not in self.data:
self.data[n] = bytearray(self.SEC_SIZE)
buf[:] = self.data[n]
def writeblocks(self, n, buf):
# print("writeblocks(%s, %x)" % (n, id(buf)))
mv = memoryview(buf)
for off in range(0, len(buf), self.SEC_SIZE):
s = n + off // self.SEC_SIZE
if s not in self.data:
self.data[s] = bytearray(self.SEC_SIZE)
self.data[s][:] = mv[off : off + self.SEC_SIZE]
def ioctl(self, op, arg):
# print("ioctl(%d, %r)" % (op, arg))
if op == 4: # MP_BLOCKDEV_IOCTL_BLOCK_COUNT
return self.blocks
if op == 5: # MP_BLOCKDEV_IOCTL_BLOCK_SIZE
return self.SEC_SIZE
try:
bdev = RAMBDevSparse(4 * 1024 * 1024 * 1024 // RAMBDevSparse.SEC_SIZE)
uos.VfsFat.mkfs(bdev)
except MemoryError:
print("SKIP")
raise SystemExit
vfs = uos.VfsFat(bdev)
uos.mount(vfs, "/ramdisk")
print("statvfs:", vfs.statvfs("/ramdisk"))
f = open("/ramdisk/test.txt", "w")
f.write("test file")
f.close()
print("statvfs:", vfs.statvfs("/ramdisk"))
f = open("/ramdisk/test.txt")
print(f.read())
f.close()
uos.umount(vfs)
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