Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: saving negative to unsigned char
  9p: return on mutex_lock_interruptible()
  9p: Creating files with names too long should fail with ENAMETOOLONG.
  9p: Make sure we are able to clunk the cached fid on umount
  9p: drop nlink remove
  fs/9p: Clunk the fid resulting from partial walk of the name
  9p: documentation update
  9p: Fix setting of protocol flags in v9fs_session_info structure.

1 files changed, 10 insertions, 2 deletions

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 82ee460e534d..7317b39b2815 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -111,7 +111,7 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
 {
         int i, n, l, clone, any, access;
         u32 uid;
-        struct p9_fid *fid;
+        struct p9_fid *fid, *old_fid = NULL;
         struct dentry *d, *ds;
         struct v9fs_session_info *v9ses;
         char **wnames, *uname;
@@ -184,10 +184,18 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
                 l = min(n - i, P9_MAXWELEM);
                 fid = p9_client_walk(fid, l, &wnames[i], clone);
                 if (IS_ERR(fid)) {
+                        if (old_fid) {
+                                /*
+                                 * If we fail, clunk fid which are mapping
+                                 * to path component and not the last component
+                                 * of the path.
+                                 */
+                                p9_client_clunk(old_fid);
+                        }
                         kfree(wnames);
                         return fid;
                 }
-
+                old_fid = fid;
                 i += l;
                 clone = 0;
         }