[v4,04/16] fsnotify: Reserve mark bits for backends

Commit Message

Gabriel Krisman Bertazi July 20, 2021, 3:59 p.m. UTC

Split out the final bits of struct fsnotify_mark->flags for use by a
backend.

Signed-off-by: Gabriel Krisman Bertazi <[e-mail]>
---
 include/linux/fsnotify_backend.h | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

Patch

diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 1ce66748a2d2..9d5586445c65 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -363,6 +363,21 @@  struct fsnotify_mark_connector {
 	struct hlist_head list;
 };
 
+#define FSNOTIFY_MARK_FLAG(flag)	\
+static const unsigned int FSNOTIFY_MARK_FLAG_##flag = \
+	(1 << FSN_MARK_FL_BIT_##flag)
+
+enum fsnotify_mark_bits {
+	FSN_MARK_FL_BIT_IGNORED_SURV_MODIFY,
+	FSN_MARK_FL_BIT_ALIVE,
+	FSN_MARK_FL_BIT_ATTACHED,
+	FSN_MARK_PRIVATE_FLAGS,
+};
+
+FSNOTIFY_MARK_FLAG(IGNORED_SURV_MODIFY);
+FSNOTIFY_MARK_FLAG(ALIVE);
+FSNOTIFY_MARK_FLAG(ATTACHED);
+
 /*
  * A mark is simply an object attached to an in core inode which allows an
  * fsnotify listener to indicate they are either no longer interested in events
@@ -398,9 +413,7 @@  struct fsnotify_mark {
 	struct fsnotify_mark_connector *connector;
 	/* Events types to ignore [mark->lock, group->mark_mutex] */
 	__u32 ignored_mask;
-#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY	0x01
-#define FSNOTIFY_MARK_FLAG_ALIVE		0x02
-#define FSNOTIFY_MARK_FLAG_ATTACHED		0x04
+	/* Upper bits [31:PRIVATE_FLAGS] are reserved for backend usage */
 	unsigned int flags;		/* flags [mark->lock] */
 };