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authorEric Paris <eparis@redhat.com>2010-07-28 10:18:38 -0400
committerEric Paris <eparis@redhat.com>2010-07-28 10:18:51 -0400
commit0c6532e4e3b0c8bd18dd0a5cc1894a1944997cc6 (patch)
tree05e9af0efc8018780a45e0c84d8264ceaf359729 /fs/notify/vfsmount_mark.c
parentc1e5c954020e123d30b4abf4038ce501861bcf9f (diff)
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fsnotify: place marks on object in order of group memory address
fsnotify_marks currently are placed on objects (inodes or vfsmounts) in arbitrary order. This patch places them in order of the group memory address. Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs/notify/vfsmount_mark.c')
-rw-r--r--fs/notify/vfsmount_mark.c40
1 files changed, 26 insertions, 14 deletions
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
index ec580a2..c4b3f14 100644
--- a/fs/notify/vfsmount_mark.c
+++ b/fs/notify/vfsmount_mark.c
@@ -141,34 +141,46 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
struct fsnotify_group *group, struct vfsmount *mnt,
int allow_dups)
{
- struct fsnotify_mark *lmark = NULL;
+ struct fsnotify_mark *lmark;
+ struct hlist_node *node, *last = NULL;
int ret = 0;
mark->flags = FSNOTIFY_MARK_FLAG_VFSMOUNT;
- /*
- * LOCKING ORDER!!!!
- * mark->lock
- * group->mark_lock
- * mnt->mnt_root->d_lock
- */
assert_spin_locked(&mark->lock);
assert_spin_locked(&group->mark_lock);
spin_lock(&mnt->mnt_root->d_lock);
- if (!allow_dups)
- lmark = fsnotify_find_vfsmount_mark_locked(group, mnt);
- if (!lmark) {
- mark->m.mnt = mnt;
+ mark->m.mnt = mnt;
+ /* is mark the first mark? */
+ if (hlist_empty(&mnt->mnt_fsnotify_marks)) {
hlist_add_head(&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;
- fsnotify_recalc_vfsmount_mask_locked(mnt);
- } else {
- ret = -EEXIST;
+ hlist_add_before(&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(last, &mark->m.m_list);
+out:
+ fsnotify_recalc_vfsmount_mask_locked(mnt);
spin_unlock(&mnt->mnt_root->d_lock);
return ret;