On Wed, 26 Mar 2008 20:45:59 -0400 Bob Copeland wrote:
> OMFS checksums the metadata of all filesystem objects. This change adds
> the necessary functions to do so.
>
> Signed-off-by: Bob Copeland <me@xxxxxxxxxxxxxxx>
> ---
> fs/omfs/checksum.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 48 insertions(+), 0 deletions(-)
> create mode 100644 fs/omfs/checksum.c
>
> diff --git a/fs/omfs/checksum.c b/fs/omfs/checksum.c
> new file mode 100644
> index 0000000..d6f1023
> --- /dev/null
> +++ b/fs/omfs/checksum.c
> @@ -0,0 +1,48 @@
> +#include <linux/fs.h>
> +#include <linux/buffer_head.h>
> +#include "omfs.h"
> +
> +#define POLY 0x1021
> +
> +/*
> + * crc-ccitt with MSB first (i.e., backwards), so we can't use the
> + * kernel table as-is.
> + */
> +static u16 omfs_crc(u16 crc, unsigned char *buf, int count)
> +{
> + int i, j;
> + for (i = 0; i < count; i++) {
> + crc ^= buf[i] << 8;
> + for (j = 0; j < 8; j++)
> + crc = (crc << 1) ^ ((crc & 0x8000) ? POLY : 0);
> + }
> + return crc;
> +}
Is this the same as crc_itu_t() from lib/crc-itu-t.c (also duplicated
in fs/udf/crc.c)?
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