feat(mount): Add ignore utimes data for Windows

This change adds the needed changes for implementing an option for
ignoring the execution of metadata timestamps update syscalls on the
Windows client.

src/mount/sauna_client.h

@@ -50,6 +50,9 @@ namespace SaunaClient {
 typedef uint32_t Inode;
 typedef uint32_t JobId;
 typedef uint32_t NamedInodeOffset;
+#ifdef _WIN32
+inline std::atomic<bool> gIgnoreUtimensUpdate = false;
+#endif
 
 void update_readdir_session(uint64_t sessId, uint64_t entryIno);
 void drop_readdir_session(uint64_t opendirSessionID);
@@ -88,6 +91,7 @@ struct FsInitParams {
 	static constexpr unsigned kDefaultCleanAcquiredFilesPeriod = 0;
 	static constexpr unsigned kDefaultCleanAcquiredFilesTimeout = 0;
 	static constexpr int      kDefaultEnableStatusUpdaterThread = 0;
+	static constexpr bool     kDefaultIgnoreUtimensUpdate = false;
 #else
 	static constexpr unsigned kDefaultWriteCacheSize = 0;
 #endif
@@ -156,6 +160,7 @@ struct FsInitParams {
 	             clean_acquired_files_period(kDefaultCleanAcquiredFilesPeriod), 
 	             clean_acquired_files_timeout(kDefaultCleanAcquiredFilesTimeout),
 	             enable_status_updater_thread(kDefaultEnableStatusUpdaterThread),
+				 ignore_utimens_update(kDefaultIgnoreUtimensUpdate),
 #endif
 	             ignore_flush(kDefaultIgnoreFlush), verbose(kDefaultVerbose), direct_io(kDirectIO) {
 	}
@@ -192,6 +197,7 @@ struct FsInitParams {
 				 clean_acquired_files_period(kDefaultCleanAcquiredFilesPeriod), 
 				 clean_acquired_files_timeout(kDefaultCleanAcquiredFilesTimeout),
 				 enable_status_updater_thread(kDefaultEnableStatusUpdaterThread),
+				 ignore_utimens_update(kDefaultIgnoreUtimensUpdate),
 #endif
 	             ignore_flush(kDefaultIgnoreFlush), verbose(kDefaultVerbose), direct_io(kDirectIO) {
 	}
@@ -246,6 +252,7 @@ struct FsInitParams {
 	unsigned clean_acquired_files_period;
 	unsigned clean_acquired_files_timeout;
 	unsigned enable_status_updater_thread;
+	unsigned ignore_utimens_update;
 #endif
 
 	bool ignore_flush;