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, 4 insertions, 0 deletions

diff --git a/libdiskfs/opts-common.c b/libdiskfs/opts-common.c
index d37c2868..841f13c3 100644
--- a/libdiskfs/opts-common.c
+++ b/libdiskfs/opts-common.c
@@ -47,6 +47,7 @@ const struct argp_option diskfs_common_options[] =
    "Do not update file access times on disk for reads"},
   {"noatime",  0,   0, OPTION_ALIAS | OPTION_HIDDEN},
   {"atime", OPT_ATIME, 0, 0, "Do update file access times for reads normally"},
+  {"strictatime", 0, 0, OPTION_ALIAS | OPTION_HIDDEN},
   {"no-inherit-dir-group", OPT_NO_INHERIT_DIR_GROUP, 0, 0,
    "Create new nodes with gid of the process"},
   {"nogrpid",    0,   0, OPTION_ALIAS | OPTION_HIDDEN},
@@ -55,5 +56,8 @@ const struct argp_option diskfs_common_options[] =
    "Create new nodes with gid of parent dir (default)"},
   {"grpid",    0,   0, OPTION_ALIAS | OPTION_HIDDEN},
   {"bsdgroups", 0,   0, OPTION_ALIAS | OPTION_HIDDEN},
+  {"relatime", 'R', 0, 0,
+    "Only update access times once daily or if older than change time "
+    "or modification time."},
   {0, 0}
 };