[XFS] add helper to get xfs_inode from vnode

SGI-PV: 947206
SGI-Modid: xfs-linux-melb:xfs-kern:203960a
Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_aops.c

@@ -54,7 +54,6 @@ xfs_page_trace(
 	int		mask)
 {
 	xfs_inode_t	*ip;
-	bhv_desc_t	*bdp;
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	loff_t		isize = i_size_read(inode);
 	loff_t		offset = page_offset(page);
@@ -63,8 +62,7 @@ xfs_page_trace(
 	if (page_has_buffers(page))
 		xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
 
-	bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
-	ip = XFS_BHVTOI(bdp);
+	ip = xfs_vtoi(vp);
 	if (!ip->i_rwtrace)
 		return;
 

fs/xfs/linux-2.6/xfs_file.c

@@ -509,16 +509,14 @@ linvfs_open_exec(
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
 	int		error = 0;
-	bhv_desc_t	*bdp;
 	xfs_inode_t	*ip;
 
 	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
-		bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
-		if (!bdp) {
+		ip = xfs_vtoi(vp);
+		if (!ip) {
 			error = -EINVAL;
 			goto open_exec_out;
 		}
-		ip = XFS_BHVTOI(bdp);
 		if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) {
 			error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
 					       0, 0, 0, NULL);

fs/xfs/linux-2.6/xfs_ioctl.c

@@ -145,13 +145,10 @@ xfs_find_handle(
 
 	if (cmd != XFS_IOC_PATH_TO_FSHANDLE) {
 		xfs_inode_t	*ip;
-		bhv_desc_t	*bhv;
 		int		lock_mode;
 
 		/* need to get access to the xfs_inode to read the generation */
-		bhv = vn_bhv_lookup_unlocked(VN_BHV_HEAD(vp), &xfs_vnodeops);
-		ASSERT(bhv);
-		ip = XFS_BHVTOI(bhv);
+		ip = xfs_vtoi(vp);
 		ASSERT(ip);
 		lock_mode = xfs_ilock_map_shared(ip);
 

fs/xfs/linux-2.6/xfs_iops.c

@@ -58,6 +58,22 @@
 #define IS_NOATIME(inode) ((inode->i_sb->s_flags & MS_NOATIME) ||	\
 	(S_ISDIR(inode->i_mode) && inode->i_sb->s_flags & MS_NODIRATIME))
 
+/*
+ * Get a XFS inode from a given vnode.
+ */
+xfs_inode_t *
+xfs_vtoi(
+	struct vnode	*vp)
+{
+	bhv_desc_t      *bdp;
+
+	bdp = bhv_lookup_range(VN_BHV_HEAD(vp),
+			VNODE_POSITION_XFS, VNODE_POSITION_XFS);
+	if (unlikely(bdp == NULL))
+		return NULL;
+	return XFS_BHVTOI(bdp);
+}
+
 /*
  * Bring the atime in the XFS inode uptodate.
  * Used before logging the inode to disk or when the Linux inode goes away.

fs/xfs/xfs_dfrag.c

@@ -60,8 +60,6 @@ xfs_swapext(
 	xfs_bstat_t	*sbp;
 	struct file	*fp = NULL, *tfp = NULL;
 	vnode_t		*vp, *tvp;
-	bhv_desc_t      *bdp, *tbdp;
-	vn_bhv_head_t   *bhp, *tbhp;
 	static uint	lock_flags = XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL;
 	int		ilf_fields, tilf_fields;
 	int		error = 0;
@@ -90,13 +88,10 @@ xfs_swapext(
 		goto error0;
 	}
 
-	bhp = VN_BHV_HEAD(vp);
-	bdp = vn_bhv_lookup(bhp, &xfs_vnodeops);
-	if (bdp == NULL) {
+	ip = xfs_vtoi(vp);
+	if (ip == NULL) {
 		error = XFS_ERROR(EBADF);
 		goto error0;
-	} else {
-		ip = XFS_BHVTOI(bdp);
 	}
 
 	if (((tfp = fget((int)sxp->sx_fdtmp)) == NULL) ||
@@ -105,13 +100,10 @@ xfs_swapext(
 		goto error0;
 	}
 
-	tbhp = VN_BHV_HEAD(tvp);
-	tbdp = vn_bhv_lookup(tbhp, &xfs_vnodeops);
-	if (tbdp == NULL) {
+	tip = xfs_vtoi(tvp);
+	if (tip == NULL) {
 		error = XFS_ERROR(EBADF);
 		goto error0;
-	} else {
-		tip = XFS_BHVTOI(tbdp);
 	}
 
 	if (ip->i_mount != tip->i_mount) {

fs/xfs/xfs_iget.c

@@ -493,7 +493,6 @@ xfs_iget(
 
 retry:
 	if ((inode = iget_locked(XFS_MTOVFS(mp)->vfs_super, ino))) {
-		bhv_desc_t	*bdp;
 		xfs_inode_t	*ip;
 
 		vp = LINVFS_GET_VP(inode);
@@ -517,14 +516,12 @@ retry:
 			 * to wait for the inode to go away.
 			 */
 			if (is_bad_inode(inode) ||
-			    ((bdp = vn_bhv_lookup(VN_BHV_HEAD(vp),
-						  &xfs_vnodeops)) == NULL)) {
+			    ((ip = xfs_vtoi(vp)) == NULL)) {
 				iput(inode);
 				delay(1);
 				goto retry;
 			}
 
-			ip = XFS_BHVTOI(bdp);
 			if (lock_flags != 0)
 				xfs_ilock(ip, lock_flags);
 			XFS_STATS_INC(xs_ig_found);

fs/xfs/xfs_inode.h

@@ -436,6 +436,8 @@ void		xfs_ichgtime(xfs_inode_t *, int);
 xfs_fsize_t	xfs_file_last_byte(xfs_inode_t *);
 void		xfs_lock_inodes(xfs_inode_t **, int, int, uint);
 
+xfs_inode_t	*xfs_vtoi(struct vnode *vp);
+
 void		xfs_synchronize_atime(xfs_inode_t *);
 
 #define xfs_ipincount(ip)	((unsigned int) atomic_read(&ip->i_pincount))

fs/xfs/xfs_rename.c

@@ -243,7 +243,6 @@ xfs_rename(
 	xfs_inode_t	*inodes[4];
 	int		target_ip_dropped = 0;	/* dropped target_ip link? */
 	vnode_t		*src_dir_vp;
-	bhv_desc_t	*target_dir_bdp;
 	int		spaceres;
 	int		target_link_zero = 0;
 	int		num_inodes;
@@ -260,14 +259,12 @@ xfs_rename(
 	 * Find the XFS behavior descriptor for the target directory
 	 * vnode since it was not handed to us.
 	 */
-	target_dir_bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(target_dir_vp),
-						&xfs_vnodeops);
-	if (target_dir_bdp == NULL) {
+	target_dp = xfs_vtoi(target_dir_vp);
+	if (target_dp == NULL) {
 		return XFS_ERROR(EXDEV);
 	}
 
 	src_dp = XFS_BHVTOI(src_dir_bdp);
-	target_dp = XFS_BHVTOI(target_dir_bdp);
 	mp = src_dp->i_mount;
 
 	if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_RENAME) ||

fs/xfs/xfs_utils.c

@@ -55,16 +55,13 @@ xfs_get_dir_entry(
 	xfs_inode_t	**ipp)
 {
 	vnode_t		*vp;
-	bhv_desc_t	*bdp;
 
 	vp = VNAME_TO_VNODE(dentry);
-	bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(vp), &xfs_vnodeops);
-	if (!bdp) {
-		*ipp = NULL;
+
+	*ipp = xfs_vtoi(vp);
+	if (!*ipp)
 		return XFS_ERROR(ENOENT);
-	}
 	VN_HOLD(vp);
-	*ipp = XFS_BHVTOI(bdp);
 	return 0;
 }
 

fs/xfs/xfs_vnodeops.c

@@ -2578,7 +2578,6 @@ xfs_link(
 	int			cancel_flags;
 	int			committed;
 	vnode_t			*target_dir_vp;
-	bhv_desc_t		*src_bdp;
 	int			resblks;
 	char			*target_name = VNAME(dentry);
 	int			target_namelen;
@@ -2591,8 +2590,7 @@ xfs_link(
 	if (VN_ISDIR(src_vp))
 		return XFS_ERROR(EPERM);
 
-	src_bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(src_vp), &xfs_vnodeops);
-	sip = XFS_BHVTOI(src_bdp);
+	sip = xfs_vtoi(src_vp);
 	tdp = XFS_BHVTOI(target_dir_bdp);
 	mp = tdp->i_mount;
 	if (XFS_FORCED_SHUTDOWN(mp))