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

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Pekka Enberg wrote:
On 8/31/05, Machida, Hiroyuki <[email protected]> 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
Thanks, I'll replace it with functions in jhash.h, then
check performance again.

--
Hiroyuki Machida		[email protected]		

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