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-rw-r--r--fs/dcache.c26
-rw-r--r--fs/namei.c4
2 files changed, 24 insertions, 6 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index b60ddc41d783..b80531c91779 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -141,18 +141,29 @@ int proc_nr_dentry(ctl_table *table, int write, void __user *buffer,
* Compare 2 name strings, return 0 if they match, otherwise non-zero.
* The strings are both count bytes long, and count is non-zero.
*/
+#ifdef CONFIG_DCACHE_WORD_ACCESS
+
+#include <asm/word-at-a-time.h>
+/*
+ * NOTE! 'cs' and 'scount' come from a dentry, so it has a
+ * aligned allocation for this particular component. We don't
+ * strictly need the load_unaligned_zeropad() safety, but it
+ * doesn't hurt either.
+ *
+ * In contrast, 'ct' and 'tcount' can be from a pathname, and do
+ * need the careful unaligned handling.
+ */
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;
+ a = load_unaligned_zeropad(cs);
+ b = load_unaligned_zeropad(ct);
if (tcount < sizeof(unsigned long))
break;
if (unlikely(a != b))
@@ -165,7 +176,13 @@ static inline int dentry_cmp(const unsigned char *cs, size_t scount,
}
mask = ~(~0ul << tcount*8);
return unlikely(!!((a ^ b) & mask));
+}
+
#else
+
+static inline int dentry_cmp(const unsigned char *cs, size_t scount,
+ const unsigned char *ct, size_t tcount)
+{
if (scount != tcount)
return 1;
@@ -177,9 +194,10 @@ static inline int dentry_cmp(const unsigned char *cs, size_t scount,
tcount--;
} while (tcount);
return 0;
-#endif
}
+#endif
+
static void __d_free(struct rcu_head *head)
{
struct dentry *dentry = container_of(head, struct dentry, d_u.d_rcu);
diff --git a/fs/namei.c b/fs/namei.c
index 0062dd17eb55..c42791914f82 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1429,7 +1429,7 @@ unsigned int full_name_hash(const unsigned char *name, unsigned int len)
unsigned long hash = 0;
for (;;) {
- a = *(unsigned long *)name;
+ a = load_unaligned_zeropad(name);
if (len < sizeof(unsigned long))
break;
hash += a;
@@ -1459,7 +1459,7 @@ static inline unsigned long hash_name(const char *name, unsigned int *hashp)
do {
hash = (hash + a) * 9;
len += sizeof(unsigned long);
- a = *(unsigned long *)(name+len);
+ a = load_unaligned_zeropad(name+len);
/* Do we have any NUL or '/' bytes in this word? */
mask = has_zero(a) | has_zero(a ^ REPEAT_BYTE('/'));
} while (!mask);