nfsd: factor out hash functions for export caches.
Both the _lookup and the _update functions for these two caches
independently calculate the hash of the key.
So factor out that code for improved reuse.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index a0c4016..65ddc5b8 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -258,10 +258,9 @@
.alloc = expkey_alloc,
};
-static struct svc_expkey *
-svc_expkey_lookup(struct svc_expkey *item)
+static int
+svc_expkey_hash(struct svc_expkey *item)
{
- struct cache_head *ch;
int hash = item->ek_fsidtype;
char * cp = (char*)item->ek_fsid;
int len = key_len(item->ek_fsidtype);
@@ -269,6 +268,14 @@
hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
hash &= EXPKEY_HASHMASK;
+ return hash;
+}
+
+static struct svc_expkey *
+svc_expkey_lookup(struct svc_expkey *item)
+{
+ struct cache_head *ch;
+ int hash = svc_expkey_hash(item);
ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
hash);
@@ -282,13 +289,7 @@
svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
{
struct cache_head *ch;
- int hash = new->ek_fsidtype;
- char * cp = (char*)new->ek_fsid;
- int len = key_len(new->ek_fsidtype);
-
- hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
- hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
- hash &= EXPKEY_HASHMASK;
+ int hash = svc_expkey_hash(new);
ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
&old->h, hash);
@@ -737,14 +738,22 @@
.alloc = svc_export_alloc,
};
+static int
+svc_export_hash(struct svc_export *exp)
+{
+ int hash;
+
+ hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
+ hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
+ hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
+ return hash;
+}
+
static struct svc_export *
svc_export_lookup(struct svc_export *exp)
{
struct cache_head *ch;
- int hash;
- hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
- hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
- hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
+ int hash = svc_export_hash(exp);
ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
hash);
@@ -758,10 +767,7 @@
svc_export_update(struct svc_export *new, struct svc_export *old)
{
struct cache_head *ch;
- int hash;
- hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
- hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
- hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
+ int hash = svc_export_hash(old);
ch = sunrpc_cache_update(&svc_export_cache, &new->h,
&old->h,