inotify: allow users to request not to recieve events on unlinked children

An inotify watch on a directory will send events for children even if those
children have been unlinked.  This patch add a new inotify flag IN_EXCL_UNLINK
which allows a watch to specificy they don't care about unlinked children.
This should fix performance problems seen by tasks which add a watch to
/tmp and then are overrun with events when other processes are reading and
writing to unlinked files they created in /tmp.

https://bugzilla.kernel.org/show_bug.cgi?id=16296

Requested-by: Matthias Clasen <mclasen@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

fs/notify/inotify/inotify_fsnotify.c

@@ -22,6 +22,7 @@
  * General Public License for more details.
  */
 
+#include <linux/dcache.h> /* d_unlinked */
 #include <linux/fs.h> /* struct inode */
 #include <linux/fsnotify_backend.h>
 #include <linux/inotify.h>
@@ -157,6 +158,14 @@ static bool inotify_should_send_event(struct fsnotify_group *group, struct inode
 	mask = (mask & ~FS_EVENT_ON_CHILD);
 	send = (fsn_mark->mask & mask);
 
+	if (send && (fsn_mark->mask & FS_EXCL_UNLINK) &&
+	    (data_type == FSNOTIFY_EVENT_PATH)) {
+		struct path *path  = data;
+
+		if (d_unlinked(path->dentry))
+			send = false;
+	}
+
 	/* find took a reference */
 	fsnotify_put_mark(fsn_mark);
 

fs/notify/inotify/inotify_user.c

@@ -97,7 +97,7 @@ static inline __u32 inotify_arg_to_mask(u32 arg)
 	mask = (FS_IN_IGNORED | FS_EVENT_ON_CHILD | FS_UNMOUNT);
 
 	/* mask off the flags used to open the fd */
-	mask |= (arg & (IN_ALL_EVENTS | IN_ONESHOT));
+	mask |= (arg & (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK));
 
 	return mask;
 }

include/linux/fsnotify_backend.h

@@ -44,6 +44,7 @@
 #define FS_OPEN_PERM		0x00010000	/* open event in an permission hook */
 #define FS_ACCESS_PERM		0x00020000	/* access event in a permissions hook */
 
+#define FS_EXCL_UNLINK		0x04000000	/* do not send events if object is unlinked */
 #define FS_IN_ISDIR		0x40000000	/* event occurred against dir */
 #define FS_IN_ONESHOT		0x80000000	/* only send event once */
 

include/linux/inotify.h

@@ -51,6 +51,7 @@ struct inotify_event {
 /* special flags */
 #define IN_ONLYDIR		0x01000000	/* only watch the path if it is a directory */
 #define IN_DONT_FOLLOW		0x02000000	/* don't follow a sym link */
+#define IN_EXCL_UNLINK		0x04000000	/* exclude events on unlinked objects */
 #define IN_MASK_ADD		0x20000000	/* add to the mask of an already existing watch */
 #define IN_ISDIR		0x40000000	/* event occurred against dir */
 #define IN_ONESHOT		0x80000000	/* only send event once */