Mark cd9660 MPSAFE and add support for using shared vnode locks during

pathname lookups.
- Remove 'i_offset' and 'i_ino' from the ISO node structure and replace
  them with local variables in the lookup routine instead.
- Cache a copy of 'i_diroff' for use during a lookup in a local variable.
- Save a copy of the found directory entry in a malloc'd buffer after a
  successfull lookup before getting the vnode.  This allows us to release
  the buffer holding the directory block before calling vget() which
  otherwise resulted in a LOR between "bufwait" and the vnode lock.
- Use an inlined version of vn_vget_ino() to handle races with ..
  lookups.  I had to inline the code here since cd9660 uses an internal
  vget routine to save a disk I/O that would otherwise re-read the
  directory block.
- Honor the requested locking flags during lookups to allow for shared
  locking.
- Honor the requested locking flags passed to VFS_ROOT() and VFS_VGET()
  similar to UFS.
- Don't make every ISO 9660 vnode hold a reference on the vnode of the
  underlying device vnode of the mountpoint.  The mountpoint already
  holds a suitable reference.

1 files changed, 0 insertions, 3 deletions

diff --git a/sys/fs/cd9660/cd9660_node.c b/sys/fs/cd9660/cd9660_node.c
index 90be9f3..64d449e 100644
--- a/sys/fs/cd9660/cd9660_node.c
+++ b/sys/fs/cd9660/cd9660_node.c
@@ -92,7 +92,6 @@ cd9660_reclaim(ap)
 	} */ *ap;
 {
 	struct vnode *vp = ap->a_vp;
-	struct iso_node *ip = VTOI(vp);
 
 	if (prtactive && vrefcnt(vp) != 0)
 		vprint("cd9660_reclaim: pushing active", vp);
@@ -108,8 +107,6 @@ cd9660_reclaim(ap)
 	/*
 	 * Purge old data structures associated with the inode.
 	 */
-	if (ip->i_mnt->im_devvp)
-		vrele(ip->i_mnt->im_devvp);
 	free(vp->v_data, M_ISOFSNODE);
 	vp->v_data = NULL;
 	return (0);