missing-syscall: define all MOUNT_ATTR_* if missing

Fixes #21876.

src/basic/missing_syscall.h

@@ -462,22 +462,58 @@ struct mount_attr {
 struct mount_attr;
 #endif
 
+#ifndef MOUNT_ATTR_RDONLY
+#define MOUNT_ATTR_RDONLY       0x00000001 /* Mount read-only */
+#endif
+
+#ifndef MOUNT_ATTR_NOSUID
+#define MOUNT_ATTR_NOSUID       0x00000002 /* Ignore suid and sgid bits */
+#endif
+
+#ifndef MOUNT_ATTR_NODEV
+#define MOUNT_ATTR_NODEV        0x00000004 /* Disallow access to device special files */
+#endif
+
+#ifndef MOUNT_ATTR_NOEXEC
+#define MOUNT_ATTR_NOEXEC       0x00000008 /* Disallow program execution */
+#endif
+
+#ifndef MOUNT_ATTR__ATIME
+#define MOUNT_ATTR__ATIME       0x00000070 /* Setting on how atime should be updated */
+#endif
+
+#ifndef MOUNT_ATTR_RELATIME
+#define MOUNT_ATTR_RELATIME     0x00000000 /* - Update atime relative to mtime/ctime. */
+#endif
+
+#ifndef MOUNT_ATTR_NOATIME
+#define MOUNT_ATTR_NOATIME      0x00000010 /* - Do not update access times. */
+#endif
+
+#ifndef MOUNT_ATTR_STRICTATIME
+#define MOUNT_ATTR_STRICTATIME  0x00000020 /* - Always perform atime updates */
+#endif
+
+#ifndef MOUNT_ATTR_NODIRATIME
+#define MOUNT_ATTR_NODIRATIME   0x00000080 /* Do not update directory access times */
+#endif
+
 #ifndef MOUNT_ATTR_IDMAP
-#define MOUNT_ATTR_IDMAP 0x00100000
+#define MOUNT_ATTR_IDMAP        0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
 #endif
 
 #ifndef MOUNT_ATTR_NOSYMFOLLOW
-#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000
+#define MOUNT_ATTR_NOSYMFOLLOW  0x00200000 /* Do not follow symlinks */
+#endif
+
+#ifndef MOUNT_ATTR_SIZE_VER0
+#define MOUNT_ATTR_SIZE_VER0    32 /* sizeof first published struct */
 #endif
 
 #ifndef AT_RECURSIVE
 #define AT_RECURSIVE 0x8000
 #endif
 
-#ifndef MOUNT_ATTR_SIZE_VER0
-#define MOUNT_ATTR_SIZE_VER0 32
-#endif
-
 static inline int missing_mount_setattr(
                 int dfd,
                 const char *path,