fsnotify: unify inode and mount marks handling
There's a lot of common code in inode and mount marks handling. Factor it
out to a common helper function.
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Eric Paris <eparis@redhat.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
index faefa72..326b148 100644
--- a/fs/notify/vfsmount_mark.c
+++ b/fs/notify/vfsmount_mark.c
@@ -32,31 +32,20 @@
void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
{
- struct fsnotify_mark *mark, *lmark;
+ 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, m.m_list) {
- list_add(&mark->m.free_m_list, &free_list);
- hlist_del_init_rcu(&mark->m.m_list);
+ 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);
- list_for_each_entry_safe(mark, lmark, &free_list, m.free_m_list) {
- struct fsnotify_group *group;
-
- spin_lock(&mark->lock);
- fsnotify_get_group(mark->group);
- group = mark->group;
- spin_unlock(&mark->lock);
-
- fsnotify_destroy_mark(mark, group);
- fsnotify_put_mark(mark);
- fsnotify_put_group(group);
- }
+ fsnotify_destroy_marks(&free_list);
}
void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
@@ -65,66 +54,35 @@
}
/*
- * Recalculate the mask of events relevant to a given vfsmount locked.
- */
-static void fsnotify_recalc_vfsmount_mask_locked(struct vfsmount *mnt)
-{
- struct mount *m = real_mount(mnt);
- struct fsnotify_mark *mark;
- __u32 new_mask = 0;
-
- assert_spin_locked(&mnt->mnt_root->d_lock);
-
- hlist_for_each_entry(mark, &m->mnt_fsnotify_marks, m.m_list)
- new_mask |= mark->mask;
- m->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)
{
+ struct mount *m = real_mount(mnt);
+
spin_lock(&mnt->mnt_root->d_lock);
- fsnotify_recalc_vfsmount_mask_locked(mnt);
+ 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->m.mnt;
+ 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->m.m_list);
- mark->m.mnt = NULL;
+ hlist_del_init_rcu(&mark->obj_list);
+ mark->mnt = NULL;
- fsnotify_recalc_vfsmount_mask_locked(mnt);
-
+ m->mnt_fsnotify_mask = fsnotify_recalc_mask(&m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);
}
-static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_group *group,
- struct vfsmount *mnt)
-{
- struct mount *m = real_mount(mnt);
- struct fsnotify_mark *mark;
-
- assert_spin_locked(&mnt->mnt_root->d_lock);
-
- hlist_for_each_entry(mark, &m->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
@@ -132,10 +90,11 @@
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_vfsmount_mark_locked(group, mnt);
+ mark = fsnotify_find_mark(&m->mnt_fsnotify_marks, group);
spin_unlock(&mnt->mnt_root->d_lock);
return mark;
@@ -151,9 +110,7 @@
int allow_dups)
{
struct mount *m = real_mount(mnt);
- struct fsnotify_mark *lmark, *last = NULL;
- int ret = 0;
- int cmp;
+ int ret;
mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
@@ -161,37 +118,9 @@
assert_spin_locked(&mark->lock);
spin_lock(&mnt->mnt_root->d_lock);
-
- mark->m.mnt = mnt;
-
- /* is mark the first mark? */
- if (hlist_empty(&m->mnt_fsnotify_marks)) {
- hlist_add_head_rcu(&mark->m.m_list, &m->mnt_fsnotify_marks);
- goto out;
- }
-
- /* should mark be in the middle of the current list? */
- hlist_for_each_entry(lmark, &m->mnt_fsnotify_marks, m.m_list) {
- last = lmark;
-
- if ((lmark->group == group) && !allow_dups) {
- ret = -EEXIST;
- goto out;
- }
-
- cmp = fsnotify_compare_groups(lmark->group, mark->group);
- if (cmp < 0)
- 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_behind_rcu(&mark->m.m_list, &last->m.m_list);
-out:
- fsnotify_recalc_vfsmount_mask_locked(mnt);
+ 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;