9p: apply review requests for fid refcounting

Fix style issues in parent commit ("apply review requests for fid
refcounting"), no functional change.

Link: http://lkml.kernel.org/r/[e-mail]
Fixes: 6636b6dcc3db ("9p: add refcount to p9_fid struct")
Signed-off-by: Dominique Martinet <[e-mail]>

fs/9p/fid.c

···
 
 static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid)
 {
-	atomic_set(&fid->count, 1);
 	hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata);
 }
 
···
 		}
 	}
 	if (ret && !IS_ERR(ret))
-		atomic_inc(&ret->count);
+		refcount_inc(&ret->count);
 	spin_unlock(&inode->i_lock);
 	return ret;
 }
···
 void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid)
 {
 	spin_lock(&inode->i_lock);
-	atomic_set(&fid->count, 1);
 	hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private);
 	spin_unlock(&inode->i_lock);
 }
···
 		hlist_for_each_entry(fid, h, dlist) {
 			if (any || uid_eq(fid->uid, uid)) {
 				ret = fid;
-				atomic_inc(&ret->count);
+				refcount_inc(&ret->count);
 				break;
 			}
 		}
···
 	}
 	/* If we are root ourself just return that */
 	if (dentry->d_sb->s_root == dentry) {
-		atomic_inc(&fid->count);
+		refcount_inc(&fid->count);
 		return fid;
 	}
 	/*
···
 			fid = ERR_PTR(-ENOENT);
 		} else {
 			__add_fid(dentry, fid);
-			atomic_inc(&fid->count);
+			refcount_inc(&fid->count);
 			spin_unlock(&dentry->d_lock);
 		}
 	}

fs/9p/fid.h

···
 	if (!fid || IS_ERR(fid))
 		return fid;
 
-	nfid = p9_client_walk(fid, 0, NULL, 1);
+	nfid = clone_fid(fid);
 	p9_client_clunk(fid);
 	return nfid;
 }

include/net/9p/client.h

···
 struct p9_fid {
 	struct p9_client *clnt;
 	u32 fid;
-	atomic_t count;
+	refcount_t count;
 	int mode;
 	struct p9_qid qid;
 	u32 iounit;

net/9p/client.c

···
 	fid->clnt = clnt;
 	fid->rdir = NULL;
 	fid->fid = 0;
-	atomic_set(&fid->count, 1);
+	refcount_set(&fid->count, 1);
 
 	idr_preload(GFP_KERNEL);
 	spin_lock_irq(&clnt->lock);
···
 		dump_stack();
 		return 0;
 	}
-	if (!atomic_dec_and_test(&fid->count))
+	if (!refcount_dec_and_test(&fid->count))
 		return 0;
 
 again: