syscalls: fsync

kernel-src/fs/ext2.c

@@ -1654,6 +1654,15 @@ static int ext2_rename(vnode_t *sourcedir, char *oldname, vnode_t *targetdir, ch
 	return err;
 }
 
+static int ext2_sync(vnode_t *vnode) {
+	int e = vmmcache_sync(vnode);
+	ext2fs_t *fs = (ext2fs_t *)vnode->vfs;
+	// TODO don't sync the entire disk but rather only the inodes and blocks
+	int e2 = vmmcache_sync(fs->backing);
+	// only the first errors are reported
+	return e ? e : e2;
+}
+
 static int ext2_inactive(vnode_t *vnode) {
 	ext2node_t *node = (ext2node_t *)vnode;
 	ext2fs_t *fs = (ext2fs_t *)vnode->vfs;
@@ -1829,7 +1838,8 @@ static vops_t vnops = {
 	.inactive = ext2_inactive,
 	.rename = ext2_rename,
 	.getpage = ext2_getpage,
-	.putpage = ext2_putpage
+	.putpage = ext2_putpage,
+	.sync = ext2_sync
 };
 
 void ext2_init() {

kernel-src/fs/pipefs.c

@@ -260,7 +260,8 @@ static vops_t vnops = {
 	.resize = pipefs_enodev,
 	.rename = pipefs_enodev,
 	.putpage = pipefs_enodev,
-	.getpage = pipefs_enodev
+	.getpage = pipefs_enodev,
+	.sync = pipefs_enodev
 };
 
 static void ctor(scache_t *cache, void *obj) {

kernel-src/fs/sockfs.c

@@ -186,7 +186,8 @@ static vops_t vnops = {
 	.rename = sockfs_enodev,
 	.ioctl = sockfs_ioctl,
 	.putpage = sockfs_enodev,
-	.getpage = sockfs_enodev
+	.getpage = sockfs_enodev,
+	.sync = sockfs_enodev
 };
 
 static void ctor(scache_t *cache, void *obj) {

kernel-src/fs/tmpfs.c

@@ -493,6 +493,11 @@ static int tmpfs_putpage(vnode_t *node, uintmax_t offset, struct page_t *page) {
 	return 0;
 }
 
+static int tmpfs_sync(vnode_t *node) {
+	// sync is a no-op on tmpfs
+	return 0;
+}
+
 static vfsops_t vfsops = {
 	.mount = tmpfs_mount,
 	.root = tmpfs_root
@@ -520,7 +525,8 @@ static vops_t vnops = {
 	.resize = tmpfs_resize,
 	.rename = tmpfs_rename,
 	.getpage = tmpfs_getpage,
-	.putpage = tmpfs_putpage
+	.putpage = tmpfs_putpage,
+	.sync = tmpfs_sync
 };
 
 static tmpfsnode_t *newnode(vfs_t *vfs, int type) {