@@ -98,6 +98,7 @@ - GBA Audio: Implement audio reset for channels A/B
  - GBA Hardware: Backport generic RTC source into core
  - All: Proper handling of Unicode file paths
  - GBA Video: Slightly optimize mode 0 mosaic rendering
+ - VFS: Add sync method to force syncing with backing
 
 0.2.1: (2015-05-13)
 Bugfixes:

@@ -39,6 +39,7 @@ void* (*map)(struct VFile* vf, size_t size, int flags);
 	void (*unmap)(struct VFile* vf, void* memory, size_t size);
 	void (*truncate)(struct VFile* vf, size_t size);
 	ssize_t (*size)(struct VFile* vf);
+	bool (*sync)(struct VFile* vf, const void* buffer, size_t size);
 };
 
 struct VDirEntry {

@@ -30,6 +30,7 @@ static void* _vfdMap(struct VFile* vf, size_t size, int flags);
 static void _vfdUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vfdTruncate(struct VFile* vf, size_t size);
 static ssize_t _vfdSize(struct VFile* vf);
+static bool _vfdSync(struct VFile* vf, const void* buffer, size_t size);
 
 struct VFile* VFileOpenFD(const char* path, int flags) {
 	if (!path) {
@@ -66,6 +67,7 @@ vfd->d.map = _vfdMap;
 	vfd->d.unmap = _vfdUnmap;
 	vfd->d.truncate = _vfdTruncate;
 	vfd->d.size = _vfdSize;
+	vfd->d.sync = _vfdSync;
 
 	return &vfd->d;
 }
@@ -166,3 +168,10 @@ return -1;
 	}
 	return stat.st_size;
 }
+
+static bool _vfdSync(struct VFile* vf, const void* buffer, size_t size) {
+	UNUSED(buffer);
+	UNUSED(size);
+	struct VFileFD* vfd = (struct VFileFD*) vf;
+	return fsync(vfd->fd) == 0;
+}

@@ -24,6 +24,7 @@ static void* _vffMap(struct VFile* vf, size_t size, int flags);
 static void _vffUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vffTruncate(struct VFile* vf, size_t size);
 static ssize_t _vffSize(struct VFile* vf);
+static bool _vffSync(struct VFile* vf, const void* buffer, size_t size);
 
 struct VFile* VFileFOpen(const char* path, const char* mode) {
 	if (!path && !mode) {
@@ -57,6 +58,7 @@ vff->d.map = _vffMap;
 	vff->d.unmap = _vffUnmap;
 	vff->d.truncate = _vffTruncate;
 	vff->d.size = _vffSize;
+	vff->d.sync = _vffSync;
 
 	return &vff->d;
 }
@@ -140,3 +142,14 @@ ssize_t size = ftell(vff->file);
 	fseek(vff->file, pos, SEEK_SET);
 	return size;
 }
+
+static bool _vffSync(struct VFile* vf, const void* buffer, size_t size) {
+	struct VFileFILE* vff = (struct VFileFILE*) vf;
+	if (buffer && size) {
+		long pos = ftell(vff->file);
+		fseek(vff->file, 0, SEEK_SET);
+		fwrite(buffer, size, 1, vff->file);
+		fseek(vff->file, pos, SEEK_SET);
+	}
+	return fflush(vff->file) == 0;
+}

@@ -56,6 +56,7 @@ static void* _vf7zMap(struct VFile* vf, size_t size, int flags);
 static void _vf7zUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vf7zTruncate(struct VFile* vf, size_t size);
 static ssize_t _vf7zSize(struct VFile* vf);
+static bool _vf7zSync(struct VFile* vf, const void* buffer, size_t size);
 
 static bool _vd7zClose(struct VDir* vd);
 static void _vd7zRewind(struct VDir* vd);
@@ -291,6 +292,7 @@ vf->d.map = _vf7zMap;
 	vf->d.unmap = _vf7zUnmap;
 	vf->d.truncate = _vf7zTruncate;
 	vf->d.size = _vf7zSize;
+	vf->d.sync = _vf7zSync;
 
 	return &vf->d;
 }
@@ -306,6 +308,13 @@ free(name);
 	}
 
 	return vde7z->utf8;
+}
+
+bool _vf7zSync(struct VFile* vf, const void* memory, size_t size) {
+	UNUSED(vf);
+	UNUSED(memory);
+	UNUSED(size);
+	return false;
 }
 
 #endif

@@ -43,6 +43,7 @@ static void* _vfzMap(struct VFile* vf, size_t size, int flags);
 static void _vfzUnmap(struct VFile* vf, void* memory, size_t size);
 static void _vfzTruncate(struct VFile* vf, size_t size);
 static ssize_t _vfzSize(struct VFile* vf);
+static bool _vfzSync(struct VFile* vf, const void* buffer, size_t size);
 
 static bool _vdzClose(struct VDir* vd);
 static void _vdzRewind(struct VDir* vd);
@@ -289,6 +290,7 @@ vfz->d.map = _vfzMap;
 	vfz->d.unmap = _vfzUnmap;
 	vfz->d.truncate = _vfzTruncate;
 	vfz->d.size = _vfzSize;
+	vfz->d.sync = _vfzSync;
 
 	return &vfz->d;
 }
@@ -300,6 +302,13 @@ if (zip_stat_index(vdez->z, vdez->index, 0, &s) < 0) {
 		return 0;
 	}
 	return s.name;
+}
+
+bool _vfzSync(struct VFile* vf, const void* memory, size_t size) {
+	UNUSED(vf);
+	UNUSED(memory);
+	UNUSED(size);
+	return false;
 }
 
 #endif