svn commit: r251590 - in head/sys: kern sys
Marcel Moolenaar
marcel at FreeBSD.org
Sun Jun 9 23:51:28 UTC 2013
Author: marcel
Date: Sun Jun 9 23:51:26 2013
New Revision: 251590
URL: http://svnweb.freebsd.org/changeset/base/251590
Log:
Add vfs_mounted and vfs_unmounted events so that components can be informed
about mount and unmount events. This is used by Juniper to implement a more
optimal implementation of NetBSD's veriexec.
Submitted by: stevek at juniper.net
Obtained from: Juniper Networks, Inc
Modified:
head/sys/kern/vfs_mount.c
head/sys/sys/mount.h
Modified: head/sys/kern/vfs_mount.c
==============================================================================
--- head/sys/kern/vfs_mount.c Sun Jun 9 23:50:30 2013 (r251589)
+++ head/sys/kern/vfs_mount.c Sun Jun 9 23:51:26 2013 (r251590)
@@ -864,6 +864,7 @@ vfs_domount_first(
VOP_UNLOCK(newdp, 0);
VOP_UNLOCK(vp, 0);
mountcheckdirs(vp, newdp);
+ EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
vrele(newdp);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
vfs_allocate_syncvnode(mp);
@@ -1355,6 +1356,7 @@ dounmount(mp, flags, td)
mtx_lock(&mountlist_mtx);
TAILQ_REMOVE(&mountlist, mp, mnt_list);
mtx_unlock(&mountlist_mtx);
+ EVENTHANDLER_INVOKE(vfs_unmounted, mp, td);
if (coveredvp != NULL) {
coveredvp->v_mountedhere = NULL;
vput(coveredvp);
Modified: head/sys/sys/mount.h
==============================================================================
--- head/sys/sys/mount.h Sun Jun 9 23:50:30 2013 (r251589)
+++ head/sys/sys/mount.h Sun Jun 9 23:51:26 2013 (r251590)
@@ -39,6 +39,7 @@
#include <sys/lock.h>
#include <sys/lockmgr.h>
#include <sys/_mutex.h>
+#include <sys/eventhandler.h>
#endif
/*
@@ -798,6 +799,17 @@ vfs_statfs_t __vfs_statfs;
extern char *mountrootfsname;
/*
+ * Event handlers
+ */
+
+typedef void (*vfs_mounted_notify_fn)(void *, struct mount *, struct vnode *,
+ struct thread *);
+typedef void (*vfs_unmounted_notify_fn)(void *, struct mount *,
+ struct thread *);
+EVENTHANDLER_DECLARE(vfs_mounted, vfs_mounted_notify_fn);
+EVENTHANDLER_DECLARE(vfs_unmounted, vfs_unmounted_notify_fn);
+
+/*
* exported vnode operations
*/
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