From a32e697cda27679a0327ae2cafdad8c7170f548f Mon Sep 17 00:00:00 2001
From: Amir Goldstein <amir73il@gmail.com>
Date: Fri, 22 Apr 2022 15:03:12 +0300
Subject: [PATCH] inotify: show inotify mask flags in proc fdinfo
Git-commit: a32e697cda27679a0327ae2cafdad8c7170f548f
Patch-mainline: v5.19-rc1
References: bsc#1200600

The inotify mask flags IN_ONESHOT and IN_EXCL_UNLINK are not "internal
to kernel" and should be exposed in procfs fdinfo so CRIU can restore
them.

Fixes: 6933599697c9 ("inotify: hide internal kernel bits from fdinfo")
Link: https://lore.kernel.org/r/20220422120327.3459282-2-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/notify/fdinfo.c               |   11 ++---------
 fs/notify/inotify/inotify.h      |   12 ++++++++++++
 fs/notify/inotify/inotify_user.c |    2 +-
 3 files changed, 15 insertions(+), 10 deletions(-)

--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -82,16 +82,9 @@ static void inotify_fdinfo(struct seq_fi
 	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
 	inode = igrab(mark->connector->inode);
 	if (inode) {
-		/*
-		 * IN_ALL_EVENTS represents all of the mask bits
-		 * that we expose to userspace.  There is at
-		 * least one bit (FS_EVENT_ON_CHILD) which is
-		 * used only internally to the kernel.
-		 */
-		u32 mask = mark->mask & IN_ALL_EVENTS;
-		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
+		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:0 ",
 			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
-			   mask, mark->ignored_mask);
+			   inotify_mark_user_mask(mark));
 		show_mark_fhandle(m, inode);
 		seq_putc(m, '\n');
 		iput(inode);
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -20,6 +20,18 @@ static inline struct inotify_event_info
 	return container_of(fse, struct inotify_event_info, fse);
 }
 
+/*
+ * INOTIFY_USER_FLAGS represents all of the mask bits that we expose to
+ * userspace.  There is at least one bit (FS_EVENT_ON_CHILD) which is
+ * used only internally to the kernel.
+ */
+#define INOTIFY_USER_MASK (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK)
+
+static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
+{
+	return fsn_mark->mask & INOTIFY_USER_MASK;
+}
+
 extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
 					   struct fsnotify_group *group);
 extern int inotify_handle_event(struct fsnotify_group *group,
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -95,7 +95,7 @@ static inline __u32 inotify_arg_to_mask(
 	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 | IN_EXCL_UNLINK));
+	mask |= (arg & INOTIFY_USER_MASK);
 
 	return mask;
 }