fanotify: Reserve UAPI bits for FAN_FS_ERROR

FAN_FS_ERROR allows reporting of event type FS_ERROR to userspace, which
is a mechanism to report file system wide problems via fanotify.  This
commit preallocate userspace visible bits to match the FS_ERROR event.

Link: https://lore.kernel.org/r/20211025192746.66445-19-krisman@collabora.com
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index c64d61b..8f15244 100644 (file)
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -752,6 +752,7 @@ 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 64553df..2990731 100644 (file)
--- 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 */