static struct hlist_bl_head *dentry_hashtable __read_mostly;
static inline struct hlist_bl_head *d_hash(const struct dentry *parent,
- unsigned long hash)
+ unsigned int hash)
{
- hash += ((unsigned long) parent ^ GOLDEN_RATIO_PRIME) / L1_CACHE_BYTES;
- hash = hash ^ ((hash ^ GOLDEN_RATIO_PRIME) >> D_HASHBITS);
+ hash += (unsigned long) parent / L1_CACHE_BYTES;
+ hash = hash + (hash >> D_HASHBITS);
return dentry_hashtable + (hash & D_HASHMASK);
}
static inline int dentry_cmp(const unsigned char *cs, size_t scount,
const unsigned char *ct, size_t tcount)
{
+#ifdef CONFIG_DCACHE_WORD_ACCESS
+ unsigned long a,b,mask;
+
+ if (unlikely(scount != tcount))
+ return 1;
+
+ for (;;) {
+ a = *(unsigned long *)cs;
+ b = *(unsigned long *)ct;
+ if (tcount < sizeof(unsigned long))
+ break;
+ if (unlikely(a != b))
+ return 1;
+ cs += sizeof(unsigned long);
+ ct += sizeof(unsigned long);
+ tcount -= sizeof(unsigned long);
+ if (!tcount)
+ return 0;
+ }
+ mask = ~(~0ul << tcount*8);
+ return unlikely(!!((a ^ b) & mask));
+#else
if (scount != tcount)
return 1;
tcount--;
} while (tcount);
return 0;
+#endif
}
static void __d_free(struct rcu_head *head)
EXPORT_SYMBOL(d_instantiate_unique);
-/**
- * d_alloc_root - allocate root dentry
- * @root_inode: inode to allocate the root for
- *
- * Allocate a root ("/") dentry for the inode given. The inode is
- * instantiated and returned. %NULL is returned if there is insufficient
- * memory or the inode passed is %NULL.
- */
-
-struct dentry * d_alloc_root(struct inode * root_inode)
-{
- struct dentry *res = NULL;
-
- if (root_inode) {
- static const struct qstr name = { .name = "/", .len = 1 };
-
- res = __d_alloc(root_inode->i_sb, &name);
- if (res)
- d_instantiate(res, root_inode);
- }
- return res;
-}
-EXPORT_SYMBOL(d_alloc_root);
-
struct dentry *d_make_root(struct inode *root_inode)
{
struct dentry *res = NULL;