Author: avg
Date: Sun Nov 4 14:16:18 2012
New Revision: 242569
URL: http://svn.freebsd.org/changeset/base/242569
Log:
opensolaris_lookup: use vfs_busy in traverse before calling VFS_ROOT
... to ensure that we have a valid mountpoint during the call.
Reviewed by: kib
MFC after: 19 days
Modified:
head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c
Modified: head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c
==============================================================================
--- head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c Sun Nov 4
14:15:13 2012 (r242568)
+++ head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c Sun Nov 4
14:16:18 2012 (r242569)
@@ -88,6 +88,7 @@ traverse(vnode_t **cvpp, int lktype)
vfsp = vn_mountedvfs(cvp);
if (vfsp == NULL)
break;
+ error = vfs_busy(vfsp, 0);
/*
* tvp is NULL for *cvpp vnode, which we can't unlock.
*/
@@ -95,12 +96,15 @@ traverse(vnode_t **cvpp, int lktype)
vput(cvp);
else
vrele(cvp);
+ if (error)
+ return (error);
/*
* The read lock must be held across the call to VFS_ROOT() to
* prevent a concurrent unmount from destroying the vfs.
*/
error = VFS_ROOT(vfsp, lktype, &tvp);
+ vfs_unbusy(vfsp);
if (error != 0)
return (error);
cvp = tvp;
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