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