kernel/vfs: add the OPEN_CREATE flag

6 files changed, 13 insertions, 6 deletions

diff --git a/src/kernel/arch/i386/driver/fsroot.c b/src/kernel/arch/i386/driver/fsroot.c
index e6e53cd..4207541 100644
--- a/src/kernel/arch/i386/driver/fsroot.c
+++ b/src/kernel/arch/i386/driver/fsroot.c
@@ -47,6 +47,8 @@ static int handle(struct vfs_request *req) {
 	assert(req->caller);
 	switch (req->type) {
 		case VFSOP_OPEN:
+			if (req->flags & OPEN_CREATE) return -1;
+
 			if (exacteq(req, "/"))		return HANDLE_ROOT;
 			if (exacteq(req, "/vga"))	return HANDLE_VGA;
 
diff --git a/src/kernel/arch/i386/driver/ps2.c b/src/kernel/arch/i386/driver/ps2.c
index b7e82eb..e1e97c0 100644
--- a/src/kernel/arch/i386/driver/ps2.c
+++ b/src/kernel/arch/i386/driver/ps2.c
@@ -31,10 +31,11 @@ static void accept(struct vfs_request *req) {
 	// when you fix something here go also fix it in the COM1 driver
 	static uint8_t buf[32]; // pretty damn stupid
 	int ret;
+	bool valid;
 	switch (req->type) {
 		case VFSOP_OPEN:
-			ret = req->input.len == 0 ? 0 : -1;
-			vfsreq_finish(req, 0);
+			valid = req->input.len == 0 && !(req->flags & OPEN_CREATE);
+			vfsreq_finish(req, valid ? 0 : -1);
 			break;
 		case VFSOP_READ:
 			if (ring_size((void*)&backlog) == 0) {
diff --git a/src/kernel/arch/i386/driver/serial.c b/src/kernel/arch/i386/driver/serial.c
index cda016c..b776d0c 100644
--- a/src/kernel/arch/i386/driver/serial.c
+++ b/src/kernel/arch/i386/driver/serial.c
@@ -69,10 +69,11 @@ void serial_write(const char *buf, size_t len) {
 static void accept(struct vfs_request *req) {
 	static char buf[32];
 	int ret;
+	bool valid;
 	switch (req->type) {
 		case VFSOP_OPEN:
-			ret = req->input.len == 0 ? 0 : -1;
-			vfsreq_finish(req, 0);
+			valid = req->input.len == 0 && !(req->flags & OPEN_CREATE);
+			vfsreq_finish(req, valid ? 0 : -1);
 			break;
 		case VFSOP_READ:
 			if (ring_size((void*)&backlog) == 0) {
diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 0d18af8..7040f6b 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -79,7 +79,7 @@ int _syscall_fork(int flags, handle_t __user *fs_front) {
 	SYSCALL_RETURN(1);
 }
 
-handle_t _syscall_open(const char __user *path, int len) {
+handle_t _syscall_open(const char __user *path, int len, int flags) {
 	struct vfs_mount *mount;
 	char *path_buf = NULL;
 
@@ -114,6 +114,7 @@ handle_t _syscall_open(const char __user *path, int len) {
 			},
 			.caller = process_current,
 			.backend = mount->backend,
+			.flags = flags,
 		});
 	return -1; // dummy
 fail:
@@ -300,7 +301,7 @@ int _syscall(int num, int a, int b, int c, int d) {
 			_syscall_fork(a, (userptr_t)b);
 			break;
 		case _SYSCALL_OPEN:
-			_syscall_open((userptr_t)a, b);
+			_syscall_open((userptr_t)a, b, c);
 			break;
 		case _SYSCALL_MOUNT:
 			_syscall_mount(a, (userptr_t)b, c);
diff --git a/src/kernel/vfs/request.c b/src/kernel/vfs/request.c
index 30c0e77..4ee5986 100644
--- a/src/kernel/vfs/request.c
+++ b/src/kernel/vfs/request.c
@@ -113,6 +113,7 @@ void vfs_backend_user_accept(struct vfs_request *req) {
 	res.capacity = req->output.len;
 	res.id       = req->id;
 	res.offset   = req->offset;
+	res.flags    = req->flags;
 	res.op       = req->type;
 
 	if (!virt_cpy_to(handler->pages,
diff --git a/src/kernel/vfs/request.h b/src/kernel/vfs/request.h
index e034bc6..cad0981 100644
--- a/src/kernel/vfs/request.h
+++ b/src/kernel/vfs/request.h
@@ -49,6 +49,7 @@ struct vfs_request {
 
 	int id; // handle.file.id
 	int offset;
+	int flags;
 
 	struct process *caller;
 	struct vfs_backend *backend;