rump_fs: add modification time

Issue #1784.

repos/dde_rump/src/server/rump_fs/directory.h

@@ -148,6 +148,17 @@ class Rump_fs::Directory : public Node
 			return node;
 		}
 
+		void update_modification_time(Timestamp const time) override
+		{
+			struct timespec ts[2] = {
+				{ .tv_sec = 0,          .tv_nsec = 0 },
+				{ .tv_sec = time.value, .tv_nsec = 0 }
+			};
+
+			/* silently igore error */
+			rump_sys_futimens(_fd, (const timespec*)&ts);
+		}
+
 		size_t read(char *dst, size_t len, seek_off_t seek_offset) override
 		{
 			if (len < sizeof(Directory_entry)) {
@@ -230,10 +241,15 @@ class Rump_fs::Directory : public Node
 
 		Status status() override
 		{
+			struct stat st;
+			if (rump_sys_fstat(_fd, &st) < 0)
+				st.st_mtime = 0;
+
 			Status s;
 			s.inode = inode();
 			s.size  = num_entries() * sizeof (Directory_entry);
 			s.mode  = File_system::Status::MODE_DIRECTORY;
+			s.modification_time = { (int64_t)st.st_mtime };
 
 			return s;
 		}

repos/dde_rump/src/server/rump_fs/file.h

@@ -114,6 +114,17 @@ class Rump_fs::File : public Node
 
 		virtual ~File() { rump_sys_close(_fd); }
 
+		void update_modification_time(Timestamp const time) override
+		{
+			struct timespec ts[2] = {
+				{ .tv_sec = 0,          .tv_nsec = 0 },
+				{ .tv_sec = time.value, .tv_nsec = 0 }
+			};
+
+			/* silently igore error */
+			rump_sys_futimens(_fd, (const timespec*)&ts);
+		}
+
 		size_t read(char *dst, size_t len, seek_off_t seek_offset) override
 		{
 			ssize_t ret;
@@ -142,25 +153,22 @@ class Rump_fs::File : public Node
 
 		virtual Status status() override
 		{
+			struct stat st;
+			if (rump_sys_fstat(_fd, &st) < 0) {
+				st.st_size = 0;
+				st.st_mtime = 0;
+			}
+
 			Status s;
 
 			s.inode = inode();
-			s.size  = length();
+			s.size  = st.st_size;
 			s.mode  = File_system::Status::MODE_FILE;
+			s.modification_time = { (int64_t)st.st_mtime };
 
 			return s;
 		}
 
-		file_size_t length() const
-		{
-			struct stat s;
-
-			if(rump_sys_fstat(_fd, &s) < 0)
-				return 0;
-
-			return s.st_size;
-		}
-
 		void truncate(file_size_t size) override
 		{
 			rump_sys_ftruncate(_fd, size);

repos/dde_rump/src/server/rump_fs/main.cc

@@ -100,6 +100,15 @@ class Rump_fs::Session_component : public Session_rpc_object
 				}
 				break;
 
+			case Packet_descriptor::WRITE_TIMESTAMP:
+				if (tx_sink()->packet_valid(packet) && packet.length() <= packet.size()) {
+					packet.with_timestamp([&] (File_system::Timestamp const time) {
+						open_node.node().update_modification_time(time);
+						succeeded = true;
+					});
+				}
+				break;
+
 			case Packet_descriptor::CONTENT_CHANGED:
 				open_node.register_notify(*tx_sink());
 				/* notify_listeners may bounce the packet back*/

repos/dde_rump/src/server/rump_fs/node.h

@@ -54,6 +54,8 @@ class Rump_fs::Node : public Node_base
 		 */
 		void name(char const *name) { strncpy(_name, name, sizeof(_name)); }
 
+		virtual void update_modification_time(Timestamp const) = 0;
+
 		virtual size_t read(char *dst, size_t len, seek_off_t) = 0;
 		virtual size_t write(char const *src, size_t len, seek_off_t) = 0;
 		virtual Status status() = 0;

repos/dde_rump/src/server/rump_fs/symlink.h

@@ -47,6 +47,11 @@ class Rump_fs::Symlink : public Node
 			Node::name(basename(path));
 		}
 
+		void update_modification_time(Timestamp const time) override
+		{
+			/* XXX not handled for now: either dirfd or fd to _path is required */
+		}
+
 		size_t write(char const *src, size_t const len, seek_off_t seek_offset) override
 		{
 			/* Ideal symlink operations are atomic. */
@@ -68,10 +73,16 @@ class Rump_fs::Symlink : public Node
 
 		Status status() override
 		{
+			struct stat st;
+			if (rump_sys_lstat(_path.base(), &st) < 0) {
+				st.st_mtime = 0;
+			}
+
 			Status s;
 			s.inode = inode();
 			s.size  = length();
 			s.mode  = File_system::Status::MODE_SYMLINK;
+			s.modification_time = { (int64_t)st.st_mtime };
 
 			return s;
 		}