linux-ext4 - [PATCH v8 24/32] fanotify: Add helpers to decide whether to report FID/DFID

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Date:   Mon, 18 Oct 2021 21:00:07 -0300
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,
        linux-api@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH v8 24/32] fanotify: Add helpers to decide whether to report FID/DFID

Now that there is an event that reports FID records even for a zeroed
file handle, wrap the logic that deides whether to issue the records
into helper functions.  This shouldn't have any impact on the code, but
simplifies further patches.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 fs/notify/fanotify/fanotify.h      | 13 +++++++++++++
 fs/notify/fanotify/fanotify_user.c | 13 +++++++------
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
index a5e81d759f65..bdf01ad4f9bf 100644
--- a/fs/notify/fanotify/fanotify.h
+++ b/fs/notify/fanotify/fanotify.h
@@ -265,6 +265,19 @@ static inline int fanotify_event_dir_fh_len(struct fanotify_event *event)
 	return info ? fanotify_info_dir_fh_len(info) : 0;
 }
 
+static inline bool fanotify_event_has_object_fh(struct fanotify_event *event)
+{
+	if (fanotify_event_object_fh_len(event) > 0)
+		return true;
+
+	return false;
+}
+
+static inline bool fanotify_event_has_dir_fh(struct fanotify_event *event)
+{
+	return (fanotify_event_dir_fh_len(event) > 0) ? true : false;
+}
+
 struct fanotify_path_event {
 	struct fanotify_event fae;
 	struct path path;
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index a860c286e885..ae848306a017 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -140,10 +140,9 @@ static size_t fanotify_event_len(unsigned int info_mode,
 		return event_len;
 
 	info = fanotify_event_info(event);
-	dir_fh_len = fanotify_event_dir_fh_len(event);
-	fh_len = fanotify_event_object_fh_len(event);
 
-	if (dir_fh_len) {
+	if (fanotify_event_has_dir_fh(event)) {
+		dir_fh_len = fanotify_event_dir_fh_len(event);
 		event_len += fanotify_fid_info_len(dir_fh_len, info->name_len);
 	} else if ((info_mode & FAN_REPORT_NAME) &&
 		   (event->mask & FAN_ONDIR)) {
@@ -157,8 +156,10 @@ static size_t fanotify_event_len(unsigned int info_mode,
 	if (info_mode & FAN_REPORT_PIDFD)
 		event_len += FANOTIFY_PIDFD_INFO_HDR_LEN;
 
-	if (fh_len)
+	if (fanotify_event_has_object_fh(event)) {
+		fh_len = fanotify_event_object_fh_len(event);
 		event_len += fanotify_fid_info_len(fh_len, dot_len);
+	}
 
 	return event_len;
 }
@@ -451,7 +452,7 @@ static int copy_info_records_to_user(struct fanotify_event *event,
 	/*
 	 * Event info records order is as follows: dir fid + name, child fid.
 	 */
-	if (fanotify_event_dir_fh_len(event)) {
+	if (fanotify_event_has_dir_fh(event)) {
 		info_type = info->name_len ? FAN_EVENT_INFO_TYPE_DFID_NAME :
 					     FAN_EVENT_INFO_TYPE_DFID;
 		ret = copy_fid_info_to_user(fanotify_event_fsid(event),
@@ -467,7 +468,7 @@ static int copy_info_records_to_user(struct fanotify_event *event,
 		total_bytes += ret;
 	}
 
-	if (fanotify_event_object_fh_len(event)) {
+	if (fanotify_event_has_object_fh(event)) {
 		const char *dot = NULL;
 		int dot_len = 0;
 
-- 
2.33.0