[PATCH] v9fs: zero copy implementation

Performance enhancement reducing the number of copies in the data and
stat paths.

Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/fs/9p/error.c b/fs/9p/error.c
index 834cb179e388..e4b6f8f38b6f 100644
--- a/fs/9p/error.c
+++ b/fs/9p/error.c
@@ -33,7 +33,6 @@
 
 #include <linux/list.h>
 #include <linux/jhash.h>
-#include <linux/string.h>
 
 #include "debug.h"
 #include "error.h"
@@ -55,7 +54,8 @@ int v9fs_error_init(void)
 
         /* load initial error map into hash table */
         for (c = errmap; c->name != NULL; c++) {
-                bucket = jhash(c->name, strlen(c->name), 0) % ERRHASHSZ;
+                c->namelen = strlen(c->name);
+                bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
                 INIT_HLIST_NODE(&c->list);
                 hlist_add_head(&c->list, &hash_errmap[bucket]);
         }
@@ -69,15 +69,15 @@ int v9fs_error_init(void)
  *
  */
 
-int v9fs_errstr2errno(char *errstr)
+int v9fs_errstr2errno(char *errstr, int len)
 {
         int errno = 0;
         struct hlist_node *p = NULL;
         struct errormap *c = NULL;
-        int bucket = jhash(errstr, strlen(errstr), 0) % ERRHASHSZ;
+        int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
 
         hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
-                if (!strcmp(c->name, errstr)) {
+                if (c->namelen==len && !memcmp(c->name, errstr, len)) {
                         errno = c->val;
                         break;
                 }