[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>

3 files changed, 25 insertions, 156 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 1a0bcbbc0a8..9b40a2799f7 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/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.
diff --git a/fs/xfs/linux-2.6/xfs_vnode.c b/fs/xfs/linux-2.6/xfs_vnode.c
index 46afc86a286..268f45bf6a9 100644
--- a/fs/xfs/linux-2.6/xfs_vnode.c
+++ b/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)
@@ -198,51 +165,6 @@ vn_revalidate(
 }
 
 /*
- * 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.
  */
 struct 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)                       \
diff --git a/fs/xfs/linux-2.6/xfs_vnode.h b/fs/xfs/linux-2.6/xfs_vnode.h
index 9977afa3890..35f306cebb8 100644
--- a/fs/xfs/linux-2.6/xfs_vnode.h
+++ b/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)             \