X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=fs%2Fdcache.c;h=25c0a1b5f6c0ecab691c8081f1f282dacb44175a;hb=3672f3f2159e90132bf827791f6960e396c81c02;hp=f09b9085f7d849e235a2b8d77c079de71c96f5d2;hpb=109c3c0292d5b256bf9e5ca2b591aa9ac5804bc2;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/dcache.c b/fs/dcache.c
index f09b9085f7d8..25c0a1b5f6c0 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -96,8 +96,6 @@ static struct kmem_cache *dentry_cache __read_mostly;
  * This hash-function tries to avoid losing too many bits of hash
  * information, yet avoid using a prime hash-size or similar.
  */
-#define D_HASHBITS     d_hash_shift
-#define D_HASHMASK     d_hash_mask
 
 static unsigned int d_hash_mask __read_mostly;
 static unsigned int d_hash_shift __read_mostly;
@@ -108,8 +106,7 @@ static inline struct hlist_bl_head *d_hash(const struct dentry *parent,
 					unsigned int hash)
 {
 	hash += (unsigned long) parent / L1_CACHE_BYTES;
-	hash = hash + (hash >> D_HASHBITS);
-	return dentry_hashtable + (hash & D_HASHMASK);
+	return dentry_hashtable + hash_32(hash, d_hash_shift);
 }
 
 /* Statistics gathering. */
@@ -2686,8 +2683,13 @@ char *d_path(const struct path *path, char *buf, int buflen)
 	 * thus don't need to be hashed.  They also don't need a name until a
 	 * user wants to identify the object in /proc/pid/fd/.  The little hack
 	 * below allows us to generate a name for these objects on demand:
+	 *
+	 * Some pseudo inodes are mountable.  When they are mounted
+	 * path->dentry == path->mnt->mnt_root.  In that case don't call d_dname
+	 * and instead have d_path return the mounted path.
 	 */
-	if (path->dentry->d_op && path->dentry->d_op->d_dname)
+	if (path->dentry->d_op && path->dentry->d_op->d_dname &&
+	    (!IS_ROOT(path->dentry) || path->dentry != path->mnt->mnt_root))
 		return path->dentry->d_op->d_dname(path->dentry, buf, buflen);
 
 	get_fs_root(current->fs, &root);
@@ -2724,6 +2726,17 @@ char *dynamic_dname(struct dentry *dentry, char *buffer, int buflen,
 	return memcpy(buffer, temp, sz);
 }
 
+char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
+{
+	char *end = buffer + buflen;
+	/* these dentries are never renamed, so d_lock is not needed */
+	if (prepend(&end, &buflen, " (deleted)", 11) ||
+	    prepend_name(&end, &buflen, &dentry->d_name) ||
+	    prepend(&end, &buflen, "/", 1))
+		end = ERR_PTR(-ENAMETOOLONG);
+	return end;
+}
+
 /*
  * Write full pathname from the root of the filesystem into the buffer.
  */