tests/extmod: Add test for FAT filesystem on a very large block device.

This commit is contained in:
Damien George 2019-03-26 17:46:27 +11:00
parent 781947afdc
commit 968b688055
2 changed files with 73 additions and 0 deletions

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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: # BP_IOCTL_SEC_COUNT
return self.blocks
if op == 5: # BP_IOCTL_SEC_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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statvfs: (32768, 32768, 131054, 131053, 131053, 0, 0, 0, 0, 255)
statvfs: (32768, 32768, 131054, 131052, 131052, 0, 0, 0, 0, 255)
test file