Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index bcbdb33fcc205aad37110be50752131aae894062..b60ddc41d78385d168e67e98adc6020fedc1cfeb 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -23,7 +23,7 @@
 #include <linux/init.h>
 #include <linux/hash.h>
 #include <linux/cache.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/mount.h>
 #include <linux/file.h>
 #include <asm/uaccess.h>
@@ -105,10 +105,10 @@ static unsigned int d_hash_shift __read_mostly;
 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);
 }
 
@@ -144,6 +144,28 @@ int proc_nr_dentry(ctl_table *table, int write, void __user *buffer,
 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;
 
@@ -155,6 +177,7 @@ static inline int dentry_cmp(const unsigned char *cs, size_t scount,
                tcount--;
        } while (tcount);
        return 0;
+#endif
 }
 
 static void __d_free(struct rcu_head *head)
@@ -1443,30 +1466,6 @@ struct dentry *d_instantiate_unique(struct dentry *entry, struct inode *inode)
 
 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;
@@ -1714,7 +1713,7 @@ EXPORT_SYMBOL(d_add_ci);
  * __d_lookup_rcu - search for a dentry (racy, store-free)
  * @parent: parent dentry
  * @name: qstr of name we wish to find
- * @seq: returns d_seq value at the point where the dentry was found
+ * @seqp: returns d_seq value at the point where the dentry was found
  * @inode: returns dentry->d_inode when the inode was found valid.
  * Returns: dentry, or NULL
  *
@@ -2405,6 +2404,7 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode)
                        if (d_ancestor(alias, dentry)) {
                                /* Check for loops */
                                actual = ERR_PTR(-ELOOP);
+                               spin_unlock(&inode->i_lock);
                        } else if (IS_ROOT(alias)) {
                                /* Is this an anonymous mountpoint that we
                                 * could splice into our tree? */
@@ -2414,7 +2414,7 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode)
                                goto found;
                        } else {
                                /* Nope, but we must(!) avoid directory
-                                * aliasing */
+                                * aliasing. This drops inode->i_lock */
                                actual = __d_unalias(inode, dentry, alias);
                        }
                        write_sequnlock(&rename_lock);