libdiskfs: Add relatime support

* doc/hurd.texi (diskfs_set_node_atime): Document relatime behavior.
* libdiskfs/diskfs.h (diskfs_set_node_atime): Likewise.
* libdiskfs/init-init.c (_diskfs_relatime): Add variable.
* libdiskfs/file-statfs.c (ST_RELATIME): Define if not defined already.
(diskfs_S_file_statfs): Report ST_RELATIME when _diskfs_relatime is set.
* libdiskfs/node-times.c (atime_should_update): New function.
(diskfs_set_node_atime): Document relatime behavior. Call
atime_should_update instead of reading _diskfs_noatime.
* libdiskfs/opts-common.c (diskfs_common_options): Add --strictatime and
-R/--relatime options.
* libdiskfs/opts-std-runtime.c (struct parse_hook): Add relatime field.
(set_opts): Set _diskfs_relatime from relatime field.
(parse_opt): Parse -R option.
* libdiskfs/opts-std-startup.c (parse_startup_opt): Parse -R option.
* libdiskfs/priv.h (_diskfs_relatime): Declare variable.
(atime_should_update): Declare function.
* libdiskfs/opts-append-std.c (diskfs_append_std_options): Add reporting
--relatime option.
* libdiskfs/conch-fetch.c (iohelp_fetch_shared_data): Call
atime_should_update instead of reading _diskfs_noatime.
* libdiskfs/rdwr-internal.c (_diskfs_rdwr_internal): Likewise.

1 files changed, 6 insertions, 0 deletions

diff --git a/libdiskfs/file-statfs.c b/libdiskfs/file-statfs.c
index c9fd6f1b..3cc60b4f 100644
--- a/libdiskfs/file-statfs.c
+++ b/libdiskfs/file-statfs.c
@@ -21,6 +21,10 @@
 #include "priv.h"
 #include "fs_S.h"
 
+#ifndef ST_RELATIME
+#  define ST_RELATIME 64
+#endif /* ST_RELATIME */
+
 /* Implement file_getcontrol as described in <hurd/fs.defs>. */
 kern_return_t
 diskfs_S_file_statfs (struct protid *file,
@@ -43,6 +47,8 @@ diskfs_S_file_statfs (struct protid *file,
     statbuf->f_flag |= ST_SYNCHRONOUS;
   if (_diskfs_noatime)
     statbuf->f_flag |= ST_NOATIME;
+  else if (_diskfs_relatime)
+    statbuf->f_flag |= ST_RELATIME;
 
   diskfs_set_statfs (statbuf);