109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <linux/atomic.h>
|
|
|
|
#include <linux/fsnotify_backend.h>
|
|
#include "fsnotify.h"
|
|
|
|
void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
|
|
{
|
|
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_VFSMOUNT);
|
|
}
|
|
|
|
/*
|
|
* Recalculate the mnt->mnt_fsnotify_mask, or the mask of all FS_* event types
|
|
* any notifier is interested in hearing for this mount point
|
|
*/
|
|
void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt)
|
|
{
|
|
struct mount *m = real_mount(mnt);
|
|
|
|
spin_lock(&mnt->mnt_root->d_lock);
|
|
m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
|
|
spin_unlock(&mnt->mnt_root->d_lock);
|
|
}
|
|
|
|
void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
|
|
{
|
|
struct vfsmount *mnt = mark->mnt;
|
|
struct mount *m = real_mount(mnt);
|
|
|
|
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
|
|
assert_spin_locked(&mark->lock);
|
|
|
|
spin_lock(&mnt->mnt_root->d_lock);
|
|
|
|
hlist_del_init_rcu(&mark->obj_list);
|
|
mark->mnt = NULL;
|
|
|
|
m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
|
|
spin_unlock(&mnt->mnt_root->d_lock);
|
|
}
|
|
|
|
/*
|
|
* given a group and vfsmount, find the mark associated with that combination.
|
|
* if found take a reference to that mark and return it, else return NULL
|
|
*/
|
|
struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group,
|
|
struct vfsmount *mnt)
|
|
{
|
|
struct mount *m = real_mount(mnt);
|
|
struct fsnotify_mark *mark;
|
|
|
|
spin_lock(&mnt->mnt_root->d_lock);
|
|
mark = fsnotify_find_mark(&m->mnt_fsnotify_marks, group);
|
|
spin_unlock(&mnt->mnt_root->d_lock);
|
|
|
|
return mark;
|
|
}
|
|
|
|
/*
|
|
* Attach an initialized mark to a given group and vfsmount.
|
|
* These marks may be used for the fsnotify backend to determine which
|
|
* event types should be delivered to which groups.
|
|
*/
|
|
int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
|
|
struct fsnotify_group *group, struct vfsmount *mnt,
|
|
int allow_dups)
|
|
{
|
|
struct mount *m = real_mount(mnt);
|
|
int ret;
|
|
|
|
mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
|
|
|
|
BUG_ON(!mutex_is_locked(&group->mark_mutex));
|
|
assert_spin_locked(&mark->lock);
|
|
|
|
spin_lock(&mnt->mnt_root->d_lock);
|
|
mark->mnt = mnt;
|
|
ret = fsnotify_add_mark_list(&m->mnt_fsnotify_marks, mark, allow_dups);
|
|
m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
|
|
spin_unlock(&mnt->mnt_root->d_lock);
|
|
|
|
return ret;
|
|
}
|