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Add vfs_mounted and vfs_unmounted events so that components can be informed

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about mount and unmount events. This is used by Juniper to implement a more
optimal implementation of NetBSD's veriexec.

Submitted by:	stevek@juniper.net
Obtained from:	Juniper Networks, Inc
This commit is contained in:
Marcel Moolenaar 2013-06-09 23:51:26 +00:00
parent 2fbad3a135
commit 8c7ca16f63
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251590
2 changed files with 14 additions and 0 deletions
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2
sys/kern/vfs_mount.c
View File

@ -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);

12
sys/sys/mount.h
View File

@ -39,6 +39,7 @@
#include <sys/lock.h>
#include <sys/lockmgr.h>
#include <sys/_mutex.h>
#include <sys/eventhandler.h>
#endif
/*
@ -797,6 +798,17 @@ 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
*/