linux-kernel - [PATCH v3] fanotify: fix incorrect fmode

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Date:   Sun, 22 May 2022 15:08:02 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Jan Kara <jack@...e.cz>
Cc:     kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Christian Brauner <brauner@...nel.org>,
        Amir Goldstein <amir73il@...il.com>,
        Matthew Bobrowski <repnop@...gle.com>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH v3] fanotify: fix incorrect fmode_t casts

Fixes sparce warnings:
fs/notify/fanotify/fanotify_user.c:267:63: sparse:
 warning: restricted fmode_t degrades to integer
fs/notify/fanotify/fanotify_user.c:1351:28: sparse:
 warning: restricted fmode_t degrades to integer

FMODE_NONTIFY have bitwise fmode_t type and requires __force attribute
for any casts.

Signed-off-by: Vasily Averin <vvs@...nvz.org>
Reviewed-by: Christian Brauner (Microsoft) <brauner@...nel.org>
---
v3: split, according to Christoph Hellwig recommendation
---
 fs/notify/fanotify/fanotify_user.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index a792e21c5309..16d8fc84713a 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -264,7 +264,7 @@ static int create_fd(struct fsnotify_group *group, struct path *path,
 	 * originally opened O_WRONLY.
 	 */
 	new_file = dentry_open(path,
-			       group->fanotify_data.f_flags | FMODE_NONOTIFY,
+			       group->fanotify_data.f_flags | __FMODE_NONOTIFY,
 			       current_cred());
 	if (IS_ERR(new_file)) {
 		/*
@@ -1348,7 +1348,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
 	    (!(fid_mode & FAN_REPORT_NAME) || !(fid_mode & FAN_REPORT_FID)))
 		return -EINVAL;
 
-	f_flags = O_RDWR | FMODE_NONOTIFY;
+	f_flags = O_RDWR | __FMODE_NONOTIFY;
 	if (flags & FAN_CLOEXEC)
 		f_flags |= O_CLOEXEC;
 	if (flags & FAN_NONBLOCK)
-- 
2.36.1