fanotify: use both marks when possible

fanotify currently, when given a vfsmount_mark will look up (if it exists)
the corresponding inode mark.  This patch drops that lookup and uses the
mark provided.

Signed-off-by: Eric Paris <eparis@redhat.com>

7 files changed, 41 insertions, 61 deletions

diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index bda588b831ad..3344bdd5506e 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -128,7 +128,7 @@ static int dnotify_handle_event(struct fsnotify_group *group,
  * userspace notification for that pair.
  */
 static bool dnotify_should_send_event(struct fsnotify_group *group,
-                                      struct inode *inode, struct vfsmount *mnt,
+                                      struct inode *inode,
                                       struct fsnotify_mark *inode_mark,
                                       struct fsnotify_mark *vfsmount_mark,
                                       __u32 mask, void *data, int data_type)
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index ef4fa4a45c94..eb8f73c9c131 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -153,59 +153,20 @@ static int fanotify_handle_event(struct fsnotify_group *group,
         return ret;
 }
 
-static bool should_send_vfsmount_event(struct fsnotify_group *group,
-                                       struct vfsmount *mnt,
-                                       struct inode *inode,
-                                       struct fsnotify_mark *mnt_mark,
-                                       __u32 mask)
-{
-        struct fsnotify_mark *inode_mark;
-
-        pr_debug("%s: group=%p vfsmount=%p mark=%p mask=%x\n",
-                 __func__, group, mnt, mnt_mark, mask);
-
-        mask &= mnt_mark->mask;
-        mask &= ~mnt_mark->ignored_mask;
-
-        if (mask) {
-                inode_mark = fsnotify_find_inode_mark(group, inode);
-                if (inode_mark) {
-                        mask &= ~inode_mark->ignored_mask;
-                        fsnotify_put_mark(inode_mark);
-                }
-        }
-
-        return mask;
-}
-
-static bool should_send_inode_event(struct fsnotify_group *group,
-                                    struct inode *inode,
-                                    struct fsnotify_mark *mark,
-                                    __u32 mask)
-{
-        pr_debug("%s: group=%p inode=%p mark=%p mask=%x\n",
-                 __func__, group, inode, mark, mask);
-
-        /*
-         * if the event is for a child and this inode doesn't care about
-         * events on the child, don't send it!
-         */
-        if ((mask & FS_EVENT_ON_CHILD) &&
-            !(mark->mask & FS_EVENT_ON_CHILD))
-                return false;
-        else
-                return true;
-}
-
 static bool fanotify_should_send_event(struct fsnotify_group *group,
                                        struct inode *to_tell,
-                                       struct vfsmount *mnt,
                                        struct fsnotify_mark *inode_mark,
-                                       struct fsnotify_mark *vfsmount_mark,
-                                       __u32 mask, void *data, int data_type)
+                                       struct fsnotify_mark *vfsmnt_mark,
+                                       __u32 event_mask, void *data, int data_type)
 {
-        pr_debug("%s: group=%p to_tell=%p mnt=%p mask=%x data=%p data_type=%d\n",
-                 __func__, group, to_tell, mnt, mask, data, data_type);
+        __u32 marks_mask, marks_ignored_mask;
+
+        pr_debug("%s: group=%p to_tell=%p inode_mark=%p vfsmnt_mark=%p "
+                 "mask=%x data=%p data_type=%d\n", __func__, group, to_tell,
+                 inode_mark, vfsmnt_mark, event_mask, data, data_type);
+
+        pr_debug("%s: group=%p vfsmount_mark=%p inode_mark=%p mask=%x\n",
+                 __func__, group, vfsmnt_mark, inode_mark, event_mask);
 
         /* sorry, fanotify only gives a damn about files and dirs */
         if (!S_ISREG(to_tell->i_mode) &&
@@ -216,11 +177,30 @@ static bool fanotify_should_send_event(struct fsnotify_group *group,
         if (data_type != FSNOTIFY_EVENT_FILE)
                 return false;
 
-        if (mnt)
-                return should_send_vfsmount_event(group, mnt, to_tell,
-                                                  vfsmount_mark, mask);
-        else
-                return should_send_inode_event(group, to_tell, inode_mark, mask);
+        if (inode_mark && vfsmnt_mark) {
+                marks_mask = (vfsmnt_mark->mask | inode_mark->mask);
+                marks_ignored_mask = (vfsmnt_mark->ignored_mask | inode_mark->ignored_mask);
+        } else if (inode_mark) {
+                /*
+                 * if the event is for a child and this inode doesn't care about
+                 * events on the child, don't send it!
+                 */
+                if ((event_mask & FS_EVENT_ON_CHILD) &&
+                    !(inode_mark->mask & FS_EVENT_ON_CHILD))
+                        return false;
+                marks_mask = inode_mark->mask;
+                marks_ignored_mask = inode_mark->ignored_mask;
+        } else if (vfsmnt_mark) {
+                marks_mask = vfsmnt_mark->mask;
+                marks_ignored_mask = vfsmnt_mark->ignored_mask;
+        } else {
+                BUG();
+        }
+
+        if (event_mask & marks_mask & ~marks_ignored_mask)
+                return true;
+
+        return false;
 }
 
 const struct fsnotify_ops fanotify_fsnotify_ops = {
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 090b64c3b4f9..4d2a82c1ceb1 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -183,7 +183,7 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
         if (!inode_test_mask && !vfsmount_test_mask)
                 return 0;
 
-        if (group->ops->should_send_event(group, to_tell, mnt, inode_mark,
+        if (group->ops->should_send_event(group, to_tell, inode_mark,
                                           vfsmount_mark, mask, data,
                                           data_is) == false)
                 return 0;
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index e53f49731b6e..5e73eeb2c697 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -142,11 +142,11 @@ static void inotify_freeing_mark(struct fsnotify_mark *fsn_mark, struct fsnotify
 }
 
 static bool inotify_should_send_event(struct fsnotify_group *group, struct inode *inode,
-                                      struct vfsmount *mnt, struct fsnotify_mark *mark,
+                                      struct fsnotify_mark *inode_mark,
                                       struct fsnotify_mark *vfsmount_mark,
                                       __u32 mask, void *data, int data_type)
 {
-        if ((mark->mask & FS_EXCL_UNLINK) &&
+        if ((inode_mark->mask & FS_EXCL_UNLINK) &&
             (data_type == FSNOTIFY_EVENT_FILE)) {
                 struct file *file  = data;
 
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index d38f922977f9..9bbfd7204b04 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -92,7 +92,7 @@ struct fsnotify_event_private_data;
  */
 struct fsnotify_ops {
         bool (*should_send_event)(struct fsnotify_group *group, struct inode *inode,
-                                  struct vfsmount *mnt, struct fsnotify_mark *inode_mark,
+                                  struct fsnotify_mark *inode_mark,
                                   struct fsnotify_mark *vfsmount_mark,
                                   __u32 mask, void *data, int data_type);
         int (*handle_event)(struct fsnotify_group *group,
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 781ab7f4e35c..7f18d3a4527e 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -921,7 +921,7 @@ static void audit_tree_freeing_mark(struct fsnotify_mark *entry, struct fsnotify
 }
 
 static bool audit_tree_send_event(struct fsnotify_group *group, struct inode *inode,
-                                  struct vfsmount *mnt, struct fsnotify_mark *inode_mark,
+                                  struct fsnotify_mark *inode_mark,
                                   struct fsnotify_mark *vfsmount_mark,
                                   __u32 mask, void *data, int data_type)
 {
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index a273cf340527..6bf2306be7d6 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -503,7 +503,7 @@ void audit_remove_watch_rule(struct audit_krule *krule)
 }
 
 static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode,
-                                          struct vfsmount *mnt, struct fsnotify_mark *inode_mark,
+                                          struct fsnotify_mark *inode_mark,
                                           struct fsnotify_mark *vfsmount_mark,
                                           __u32 mask, void *data, int data_type)
 {