svn commit: r187528 - in head/sys: kern sys ufs/ufs

[Konstantin Belousov]

Author: kib
Date: Wed Jan 21 14:51:38 2009
New Revision: 187528
URL: http://svn.freebsd.org/changeset/base/187528

Log:
  Move the code from ufs_lookup.c used to do dotdot lookup, into
  the helper function. It is supposed to be useful for any filesystem
  that has to unlock dvp to walk to the ".." entry in lookup routine.
  
  Requested by:	jhb
  Tested by:	pho
  MFC after:	1 month

Modified:
  head/sys/kern/vfs_vnops.c
  head/sys/sys/vnode.h
  head/sys/ufs/ufs/ufs_lookup.c

Modified: head/sys/kern/vfs_vnops.c
==============================================================================
--- head/sys/kern/vfs_vnops.c	Wed Jan 21 14:43:35 2009	(r187527)
+++ head/sys/kern/vfs_vnops.c	Wed Jan 21 14:51:38 2009	(r187528)
@@ -1286,3 +1286,35 @@ vn_extattr_rm(struct vnode *vp, int iofl
 
 	return (error);
 }
+
+int
+vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags, struct vnode **rvp)
+{
+	struct mount *mp;
+	int ltype, error;
+
+	mp = vp->v_mount;
+	ltype = VOP_ISLOCKED(vp);
+	KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED,
+	    ("vn_vget_ino: vp not locked"));
+	for (;;) {
+		error = vfs_busy(mp, MBF_NOWAIT);
+		if (error == 0)
+			break;
+		VOP_UNLOCK(vp, 0);
+		pause("vn_vget", 1);
+		vn_lock(vp, ltype | LK_RETRY);
+		if (vp->v_iflag & VI_DOOMED)
+			return (ENOENT);
+	}
+	VOP_UNLOCK(vp, 0);
+	error = VFS_VGET(mp, ino, lkflags, rvp);
+	vfs_unbusy(mp);
+	vn_lock(vp, ltype | LK_RETRY);
+	if (vp->v_iflag & VI_DOOMED) {
+		if (error == 0)
+			vput(*rvp);
+		error = ENOENT;
+	}
+	return (error);
+}

Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h	Wed Jan 21 14:43:35 2009	(r187527)
+++ head/sys/sys/vnode.h	Wed Jan 21 14:51:38 2009	(r187528)
@@ -636,6 +636,9 @@ int	vn_extattr_set(struct vnode *vp, int
 	    const char *attrname, int buflen, char *buf, struct thread *td);
 int	vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
 	    const char *attrname, struct thread *td);
+int	vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags,
+	    struct vnode **rvp);
+
 int	vfs_cache_lookup(struct vop_lookup_args *ap);
 void	vfs_timestamp(struct timespec *);
 void	vfs_write_resume(struct mount *mp);

Modified: head/sys/ufs/ufs/ufs_lookup.c
==============================================================================
--- head/sys/ufs/ufs/ufs_lookup.c	Wed Jan 21 14:43:35 2009	(r187527)
+++ head/sys/ufs/ufs/ufs_lookup.c	Wed Jan 21 14:51:38 2009	(r187528)
@@ -157,7 +157,6 @@ ufs_lookup(ap)
 	int nameiop = cnp->cn_nameiop;
 	ino_t ino;
 	int ltype;
-	struct mount *mp;
 
 	bp = NULL;
 	slotoffset = -1;
@@ -578,27 +577,7 @@ found:
 	 */
 	pdp = vdp;
 	if (flags & ISDOTDOT) {
-		ltype = VOP_ISLOCKED(pdp);
-		mp = pdp->v_mount;
-		for (;;) {
-			error = vfs_busy(mp, MBF_NOWAIT);
-			if (error == 0)
-				break;
-			VOP_UNLOCK(pdp, 0);
-			pause("ufs_dd", 1);
-			vn_lock(pdp, ltype | LK_RETRY);
-			if (pdp->v_iflag & VI_DOOMED)
-				return (ENOENT);
-		}
-		VOP_UNLOCK(pdp, 0);	/* race to get the inode */
-		error = VFS_VGET(mp, ino, cnp->cn_lkflags, &tdp);
-		vfs_unbusy(mp);
-		vn_lock(pdp, ltype | LK_RETRY);
-		if (pdp->v_iflag & VI_DOOMED) {
-			if (error == 0)
-				vput(tdp);
-			error = ENOENT;
-		}
+		error = vn_vget_ino(pdp, ino, cnp->cn_lkflags, &tdp);
 		if (error)
 			return (error);
 		*vpp = tdp;