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-rw-r--r--fs/notify/vfsmount_mark.c187
1 files changed, 187 insertions, 0 deletions
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
new file mode 100644
index 000000000000..56772b578fbd
--- /dev/null
+++ b/fs/notify/vfsmount_mark.c
@@ -0,0 +1,187 @@
+/*
+ * 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/writeback.h> /* for inode_lock */
+
+#include <asm/atomic.h>
+
+#include <linux/fsnotify_backend.h>
+#include "fsnotify.h"
+
+void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
+{
+ struct fsnotify_mark *mark, *lmark;
+ struct hlist_node *pos, *n;
+ LIST_HEAD(free_list);
+
+ spin_lock(&mnt->mnt_root->d_lock);
+ hlist_for_each_entry_safe(mark, pos, n, &mnt->mnt_fsnotify_marks, m.m_list) {
+ list_add(&mark->m.free_m_list, &free_list);
+ hlist_del_init_rcu(&mark->m.m_list);
+ fsnotify_get_mark(mark);
+ }
+ spin_unlock(&mnt->mnt_root->d_lock);
+
+ list_for_each_entry_safe(mark, lmark, &free_list, m.free_m_list) {
+ fsnotify_destroy_mark(mark);
+ fsnotify_put_mark(mark);
+ }
+}
+
+void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
+{
+ fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_VFSMOUNT);
+}
+
+/*
+ * Recalculate the mask of events relevant to a given vfsmount locked.
+ */
+static void fsnotify_recalc_vfsmount_mask_locked(struct vfsmount *mnt)
+{
+ struct fsnotify_mark *mark;
+ struct hlist_node *pos;
+ __u32 new_mask = 0;
+
+ assert_spin_locked(&mnt->mnt_root->d_lock);
+
+ hlist_for_each_entry(mark, pos, &mnt->mnt_fsnotify_marks, m.m_list)
+ new_mask |= mark->mask;
+ mnt->mnt_fsnotify_mask = new_mask;
+}
+
+/*
+ * 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)
+{
+ spin_lock(&mnt->mnt_root->d_lock);
+ fsnotify_recalc_vfsmount_mask_locked(mnt);
+ spin_unlock(&mnt->mnt_root->d_lock);
+}
+
+void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
+{
+ struct vfsmount *mnt = mark->m.mnt;
+
+ assert_spin_locked(&mark->lock);
+ assert_spin_locked(&mark->group->mark_lock);
+
+ spin_lock(&mnt->mnt_root->d_lock);
+
+ hlist_del_init_rcu(&mark->m.m_list);
+ mark->m.mnt = NULL;
+
+ fsnotify_recalc_vfsmount_mask_locked(mnt);
+
+ spin_unlock(&mnt->mnt_root->d_lock);
+}
+
+static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_group *group,
+ struct vfsmount *mnt)
+{
+ struct fsnotify_mark *mark;
+ struct hlist_node *pos;
+
+ assert_spin_locked(&mnt->mnt_root->d_lock);
+
+ hlist_for_each_entry(mark, pos, &mnt->mnt_fsnotify_marks, m.m_list) {
+ if (mark->group == group) {
+ fsnotify_get_mark(mark);
+ return mark;
+ }
+ }
+ return NULL;
+}
+
+/*
+ * 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 fsnotify_mark *mark;
+
+ spin_lock(&mnt->mnt_root->d_lock);
+ mark = fsnotify_find_vfsmount_mark_locked(group, mnt);
+ 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 fsnotify_mark *lmark;
+ struct hlist_node *node, *last = NULL;
+ int ret = 0;
+
+ mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
+
+ assert_spin_locked(&mark->lock);
+ assert_spin_locked(&group->mark_lock);
+
+ spin_lock(&mnt->mnt_root->d_lock);
+
+ mark->m.mnt = mnt;
+
+ /* is mark the first mark? */
+ if (hlist_empty(&mnt->mnt_fsnotify_marks)) {
+ hlist_add_head_rcu(&mark->m.m_list, &mnt->mnt_fsnotify_marks);
+ goto out;
+ }
+
+ /* should mark be in the middle of the current list? */
+ hlist_for_each_entry(lmark, node, &mnt->mnt_fsnotify_marks, m.m_list) {
+ last = node;
+
+ if ((lmark->group == group) && !allow_dups) {
+ ret = -EEXIST;
+ goto out;
+ }
+
+ if (mark->group < lmark->group)
+ continue;
+
+ hlist_add_before_rcu(&mark->m.m_list, &lmark->m.m_list);
+ goto out;
+ }
+
+ BUG_ON(last == NULL);
+ /* mark should be the last entry. last is the current last entry */
+ hlist_add_after_rcu(last, &mark->m.m_list);
+out:
+ fsnotify_recalc_vfsmount_mask_locked(mnt);
+ spin_unlock(&mnt->mnt_root->d_lock);
+
+ return ret;
+}