Re: [PATCH][FAT] FAT dirent scan with hin take #3

Pekka Enberg
2005-08-31T10:03:41Z

On 8/31/05, Machida, Hiroyuki <machida@sm.sony.co.jp> wrote:
> +inline
> +static int hint_index_body(const unsigned char *name, int name_len, int check_null)
> +{
> + int i;
> + int val = 0;
> + unsigned char *p = (unsigned char *) name;
> + int id = current->pid;
> +
> + for (i=0; i<name_len; i++) {
> + if (check_null && !*p) break;
> + val = ((val << 1) & 0xfe) | ((val & 0x80) ? 1 : 0);
> + val ^= *p;
> + p ++;
> + }
> + id = ((id >> 8) & 0xf) ^ (id & 0xf);
> + val = (val << 1) | (id & 1);
> + return val & (FAT_SCAN_NWAY-1);

Couldn't you use jhash() from <linux/jhash.h> here?

Pekka