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Writing to a disk

From: bertrand . sirodot
Subject: Writing to a disk
Date: Fri, 15 Jun 2001 17:10:42 +0100

Hi everybody,

I am trying to learn how to write a translator so I am trying to write a
translator that will write stuff to a disk. By using the storeread example,
I have been able to read data from a disk, but now, I am trying to write to
it and it doesn't work.
In summary, here is whate I am doing:
     char buf[] = "Hello, world !";
      file = file_name_lookup(argv[1], O_NOLINK, 0); /* argv[1] being the
device name i.e. /dev/sd2s2 */
     err = store_open(file, O_RDWR, STORAGE_DEVICE, &store);
     store_write(store, 0, buf, sizeof(buf), &amount);  /* stuff being what
I want to write */

The error message I get is:
     test_store: ../../libstore/rdwr.c:111: store_write: Assertion '(len &
(store->block_size - 1)) == 0' failed.

The store I am trying to write to has a block size of 512 and the size of
buf is 14. When we use the store_write inteerface, does the size of the ios
need to be a factor of the block size?
Otherwise, what is the way of achieving this?

Thank you very much in advance for the answers.


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