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-rw-r--r--fs/notify/vfsmount_mark.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
new file mode 100644
index 000000000..326b148e6
--- /dev/null
+++ b/fs/notify/vfsmount_mark.c
@@ -0,0 +1,127 @@
+/*
+ * 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"
+#include "../mount.h"
+
+void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
+{
+ struct fsnotify_mark *mark;
+ struct hlist_node *n;
+ struct mount *m = real_mount(mnt);
+ LIST_HEAD(free_list);
+
+ spin_lock(&mnt->mnt_root->d_lock);
+ hlist_for_each_entry_safe(mark, n, &m->mnt_fsnotify_marks, obj_list) {
+ list_add(&mark->free_list, &free_list);
+ hlist_del_init_rcu(&mark->obj_list);
+ fsnotify_get_mark(mark);
+ }
+ spin_unlock(&mnt->mnt_root->d_lock);
+
+ fsnotify_destroy_marks(&free_list);
+}
+
+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;
+}