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* node-times.c (diskfs_set_node_times): If _diskfs_noatime is set and
neither NP->dn_set_mtime nor NP->dn_set_ctime is set, clear
NP->dn_set_atime. Short-circuit return if none of dn_set_?time set.
* opts-common.c (diskfs_common_options): Include "priv.h".
Add aliases --ro/--rw for -r/-w. Add alias --nosuid for --no-suid,
--noexec for --no-exec. Move --suid-ok, --exec-ok here from ...
* opts-std-runtime.c (std_runtime_options): ... here.
(struct parse_hook): New member `noatime'.
(set_opts): Use H->noatime to set _diskfs_noatime.
(parse_opt): Grok -A and OPT_ATIME to set/clear H->noatime.
(OPT_ATIME): New macro.
(OPT_SUID_OK, OPT_EXEC_OK): Moved to ...
* priv.h: ... here.
(diskfs_common_options): Add const to decl.
* opts-std-startup.c (parse_startup_opt): Grok OPT_SUID_OK,
OPT_EXEC_OK, -A, and OPT_ATIME.
* init-init.c (_diskfs_noatime): New variable.
(_diskfs_nosuid, _diskfs_noexec): Use uninitialized defns.
* opts-append-std.c (diskfs_append_std_options): Add --no-atime if
_diskfs_noatime is set.
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* priv.h (nosuid, noexec): New variables.
* init-init.c (nosuid, noexec): New variables, initialized to zero.
* file-exec.c (diskfs_S_file_exec): If noexec is on, then prohibit
all execution with EACCES. If nosuid is on, then prohibit setuid
or setgid execution by silently omitting the uid substitution.
* opts-std-startup.c (parse_startup_opt): Implement --no-suid and
--no-exec.
* opts-common.c (diskfs_common_options): Add --no-suid and
--no-exec.
* opts-std-runtime.c (struct parse_hook): Add nosuid and noexec.
(parse_opt) [cases 'S', 'E', OPT_SUID_OK, OPT_EXEC_OK] Understand
--no-suid, --no-exec, --suid-ok, and --exec-ok.
(parse_opt) [case ARGP_KEY_INIT]: Initialize H->nosuid and
H->noexec.
(OPT_SUID_OK, OPT_EXEC_OK): New macros.
(std_runtime_options): Add --suid-ok and --exec-ok.
(set_opts): Set nosuid and noexec from H->nosuid and H->noexec.
* opts-common.c (diskfs_common_options): Rename --nosync to
--no-sync; leave --nosync as an alias.
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