[XFS] streamline the clear_inode path

SGI-PV: 940531
SGI-Modid: xfs-linux:xfs-kern:196888a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_super.c

@@ -383,17 +383,33 @@ linvfs_clear_inode(
 	struct inode		*inode)
 {
 	vnode_t			*vp = LINVFS_GET_VP(inode);
+	int			error, cache;
 
-	if (vp) {
-		vn_rele(vp);
-		vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
-		/*
-		 * Do all our cleanup, and remove this vnode.
-		 */
-		vn_remove(vp);
-	}
-}
+	vn_trace_entry(vp, "clear_inode", (inst_t *)__return_address);
+
+	ASSERT(vp->v_fbhv != NULL);
+
+	XFS_STATS_INC(vn_rele);
+	XFS_STATS_INC(vn_remove);
+	XFS_STATS_INC(vn_reclaim);
+	XFS_STATS_DEC(vn_active);
 
+	VOP_INACTIVE(vp, NULL, cache);
+
+	VN_LOCK(vp);
+	vp->v_flag &= ~VMODIFIED;
+	VN_UNLOCK(vp, 0);
+
+	VOP_RECLAIM(vp, error);
+	if (error)
+		panic("vn_purge: cannot reclaim");
+
+	ASSERT(vp->v_fbhv == NULL);
+
+#ifdef XFS_VNODE_TRACE
+	ktrace_free(vp->v_trace);
+#endif
+}
 
 /*
  * Enqueue a work item to be picked up by the vfs xfssyncd thread.

fs/xfs/linux-2.6/xfs_vnode.c

@@ -71,39 +71,6 @@ vn_iowake(
 		wake_up(vptosync(vp));
 }
 
-/*
- * Clean a vnode of filesystem-specific data and prepare it for reuse.
- */
-STATIC int
-vn_reclaim(
-	struct vnode	*vp)
-{
-	int		error;
-
-	XFS_STATS_INC(vn_reclaim);
-	vn_trace_entry(vp, "vn_reclaim", (inst_t *)__return_address);
-
-	/*
-	 * Only make the VOP_RECLAIM call if there are behaviors
-	 * to call.
-	 */
-	if (vp->v_fbhv) {
-		VOP_RECLAIM(vp, error);
-		if (error)
-			return -error;
-	}
-	ASSERT(vp->v_fbhv == NULL);
-
-	vp->v_fbhv = NULL;
-
-#ifdef XFS_VNODE_TRACE
-	ktrace_free(vp->v_trace);
-	vp->v_trace = NULL;
-#endif
-
-	return 0;
-}
-
 struct vnode *
 vn_initialize(
 	struct inode	*inode)
@@ -197,51 +164,6 @@ vn_revalidate(
 	return -error;
 }
 
-/*
- * purge a vnode from the cache
- * At this point the vnode is guaranteed to have no references (vn_count == 0)
- * The caller has to make sure that there are no ways someone could
- * get a handle (via vn_get) on the vnode (usually done via a mount/vfs lock).
- */
-void
-vn_purge(
-	struct vnode	*vp,
-	vmap_t		*vmap)
-{
-	vn_trace_entry(vp, "vn_purge", (inst_t *)__return_address);
-
-	/*
-	 * Check whether vp has already been reclaimed since our caller
-	 * sampled its version while holding a filesystem cache lock that
-	 * its VOP_RECLAIM function acquires.
-	 */
-	VN_LOCK(vp);
-	if (vp->v_number != vmap->v_number) {
-		VN_UNLOCK(vp, 0);
-		return;
-	}
-
-	/*
-	 * Another process could have raced in and gotten this vnode...
-	 */
-	if (vn_count(vp) > 0) {
-		VN_UNLOCK(vp, 0);
-		return;
-	}
-
-	XFS_STATS_DEC(vn_active);
-	VN_UNLOCK(vp, 0);
-
-	/*
-	 * Call VOP_RECLAIM and clean vp. The FSYNC_INVAL flag tells
-	 * vp's filesystem to flush and invalidate all cached resources.
-	 * When vn_reclaim returns, vp should have no private data,
-	 * either in a system cache or attached to v_data.
-	 */
-	if (vn_reclaim(vp) != 0)
-		panic("vn_purge: cannot reclaim");
-}
-
 /*
  * Add a reference to a referenced vnode.
  */
@@ -261,72 +183,6 @@ vn_hold(
 	return vp;
 }
 
-/*
- *  Call VOP_INACTIVE on last reference.
- */
-void
-vn_rele(
-	struct vnode	*vp)
-{
-	int		vcnt;
-	int		cache;
-
-	XFS_STATS_INC(vn_rele);
-
-	VN_LOCK(vp);
-
-	vn_trace_entry(vp, "vn_rele", (inst_t *)__return_address);
-	vcnt = vn_count(vp);
-
-	/*
-	 * Since we always get called from put_inode we know
-	 * that i_count won't be decremented after we
-	 * return.
-	 */
-	if (!vcnt) {
-		VN_UNLOCK(vp, 0);
-
-		/*
-		 * Do not make the VOP_INACTIVE call if there
-		 * are no behaviors attached to the vnode to call.
-		 */
-		if (vp->v_fbhv)
-			VOP_INACTIVE(vp, NULL, cache);
-
-		VN_LOCK(vp);
-		vp->v_flag &= ~VMODIFIED;
-	}
-
-	VN_UNLOCK(vp, 0);
-
-	vn_trace_exit(vp, "vn_rele", (inst_t *)__return_address);
-}
-
-/*
- * Finish the removal of a vnode.
- */
-void
-vn_remove(
-	struct vnode	*vp)
-{
-	vmap_t		vmap;
-
-	/* Make sure we don't do this to the same vnode twice */
-	if (!(vp->v_fbhv))
-		return;
-
-	XFS_STATS_INC(vn_remove);
-	vn_trace_exit(vp, "vn_remove", (inst_t *)__return_address);
-
-	/*
-	 * After the following purge the vnode
-	 * will no longer exist.
-	 */
-	VMAP(vp, vmap);
-	vn_purge(vp, &vmap);
-}
-
-
 #ifdef	XFS_VNODE_TRACE
 
 #define KTRACE_ENTER(vp, vk, s, line, ra)			\

fs/xfs/linux-2.6/xfs_vnode.h

@@ -502,10 +502,8 @@ typedef struct vnode_map {
 			 (vmap).v_number = (vp)->v_number,	\
 			 (vmap).v_ino	 = (vp)->v_inode.i_ino; }
 
-extern void	vn_purge(struct vnode *, vmap_t *);
 extern int	vn_revalidate(struct vnode *);
 extern void	vn_revalidate_core(struct vnode *, vattr_t *);
-extern void	vn_remove(struct vnode *);
 
 extern void	vn_iowait(struct vnode *vp);
 extern void	vn_iowake(struct vnode *vp);
@@ -519,7 +517,6 @@ static inline int vn_count(struct vnode *vp)
  * Vnode reference counting functions (and macros for compatibility).
  */
 extern vnode_t	*vn_hold(struct vnode *);
-extern void	vn_rele(struct vnode *);
 
 #if defined(XFS_VNODE_TRACE)
 #define VN_HOLD(vp)		\