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From:   Gabriel Krisman Bertazi <krisman@collabora.com>
To:     amir73il@gmail.com, jack@suse.com
Cc:     linux-api@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-fsdevel@vger.kernel.org, khazhy@google.com,
        dhowells@redhat.com, david@fromorbit.com, tytso@mit.edu,
        djwong@kernel.org, repnop@google.com,
        Gabriel Krisman Bertazi <krisman@collabora.com>,
        kernel@collabora.com, Jan Kara <jack@suse.cz>
Subject: [PATCH v6 14/21] fanotify: Reserve UAPI bits for FAN_FS_ERROR
Date:   Thu, 12 Aug 2021 17:40:03 -0400
Message-Id: <20210812214010.3197279-15-krisman@collabora.com>
In-Reply-To: <20210812214010.3197279-1-krisman@collabora.com>
References: <20210812214010.3197279-1-krisman@collabora.com>
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FAN_FS_ERROR allows reporting of event type FS_ERROR to userspace, which
a mechanism to report file system wide problems via fanotify.  This
commit preallocate userspace visible bits to match the FS_ERROR event.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
---
 fs/notify/fanotify/fanotify.c | 1 +
 include/uapi/linux/fanotify.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 2b1ab031fbe5..ebb6c557cea1 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -760,6 +760,7 @@ static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
 	BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
 	BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
 	BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
+	BUILD_BUG_ON(FAN_FS_ERROR != FS_ERROR);
 
 	BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
 
diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
index fbf9c5c7dd59..16402037fc7a 100644
--- a/include/uapi/linux/fanotify.h
+++ b/include/uapi/linux/fanotify.h
@@ -20,6 +20,7 @@
 #define FAN_OPEN_EXEC		0x00001000	/* File was opened for exec */
 
 #define FAN_Q_OVERFLOW		0x00004000	/* Event queued overflowed */
+#define FAN_FS_ERROR		0x00008000	/* Filesystem error */
 
 #define FAN_OPEN_PERM		0x00010000	/* File open in perm check */
 #define FAN_ACCESS_PERM		0x00020000	/* File accessed in perm check */
-- 
2.32.0