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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.

This change differs from r253224 in the following way:
o   The vfs_mounted handler is called before mountcheckdirs() and with
    newdp locked. vp is unlocked.
o   The event handlers are declared in <sys/eventhandler.h> and not in
    <sys/mount.h>. The <sys/mount.h> header is used in user land code
    that pretends to be kernel code and as such creates a very convoluted
    environment. It's hard to untangle.

Submitted by:	stevek@juniper.net
Discussed with:	pjd@
Obtained from:	Juniper Networks, Inc.
This commit is contained in:
Marcel Moolenaar 2013-07-10 15:35:25 +00:00
parent 07dacf031e
commit 8939c0693c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=253158
2 changed files with 14 additions and 2 deletions
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4
sys/kern/vfs_mount.c
View File

@ -861,8 +861,9 @@ vfs_domount_first(
vfs_event_signal(NULL, VQ_MOUNT, 0);
if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
panic("mount: lost mount");
VOP_UNLOCK(newdp, 0);
VOP_UNLOCK(vp, 0);
EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
VOP_UNLOCK(newdp, 0);
mountcheckdirs(vp, newdp);
vrele(newdp);
if ((mp->mnt_flag & MNT_RDONLY) == 0)
@ -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/eventhandler.h
View File

@ -192,6 +192,17 @@ EVENTHANDLER_DECLARE(vm_lowmem, vm_lowmem_handler_t);
typedef void (*mountroot_handler_t)(void *);
EVENTHANDLER_DECLARE(mountroot, mountroot_handler_t);
/* File system mount events */
struct mount;
struct vnode;
struct thread;
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);
/* VLAN state change events */
struct ifnet;
typedef void (*vlan_config_fn)(void *, struct ifnet *, uint16_t);
@ -231,7 +242,6 @@ EVENTHANDLER_DECLARE(process_exec, execlist_fn);
/*
* application dump event
*/
struct thread;
typedef void (*app_coredump_start_fn)(void *, struct thread *, char *name);
typedef void (*app_coredump_progress_fn)(void *, struct thread *td, int byte_count);
typedef void (*app_coredump_finish_fn)(void *, struct thread *td);