nfsd4: fix FREE_STATEID lockowner leak

[firefly-linux-kernel-4.4.55.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index f09b9085f7d849e235a2b8d77c079de71c96f5d2..9a59653d3449753923e3ddfd97e9d9eca2f36f04 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2686,8 +2686,13 @@ 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 +2729,17 @@ 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.
  */