Messages in this thread | | | Date | Mon, 06 Sep 1999 00:44:32 +1000 | From | Robert Norris <> | Subject | Block sizes < 512 bytes |
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Greetings.
I've been working on a filesystem driver for old CBM1541 disks (and images), mainly because I have a collection of some 3000+ disks.
Tthe filesystem on these disks is structured into 683 blocks of 256 bytes each. The 'superblock' is on block 358.
In my first attempt, part of the code in read_super() looked like this:
set_blocksize(s->s_dev, 256); bh = bread(s->s_dev, 258, 256);
After testing and enjoying the panic that ensued, I did some hunting and discovered in fs/buffer.c that the block size must >= 512 bytes.
Why is this? I admit I'm unfamiliar with most of the filesystem code, but it seems a little silly to limit the block size in this (seemingly arbitrary) way.
Am I doing this wrong? Is there another way to acheive what I want?
Regards, Rob.
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