linux-ext4 - [PATCH v4 04/16] fsnotify: Reserve mark bits for backends

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Message-Id: <20210720155944.1447086-5-krisman@collabora.com>
Date:   Tue, 20 Jul 2021 11:59:32 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     jack@...e.com, amir73il@...il.com
Cc:     djwong@...nel.org, tytso@....edu, david@...morbit.com,
        dhowells@...hat.com, khazhy@...gle.com,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH v4 04/16] fsnotify: Reserve mark bits for backends

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

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 include/linux/fsnotify_backend.h | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

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] */
 };
 
-- 
2.32.0