kernel: rename VOP and syscall

kernel-src/sys/syscalls/renameat.c

@@ -0,0 +1,89 @@
+#include <kernel/syscalls.h>
+#include <kernel/alloc.h>
+#include <string.h>
+#include <logging.h>
+
+syscallret_t syscall_renameat(context_t *context, int olddirfd, const char *uoldpath, int newdirfd, const char *unewpath, unsigned int flags) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	__assert(flags == 0);
+
+	char *oldcomponent = NULL;
+	char *newcomponent = NULL;
+	char *oldpath = alloc(strlen(uoldpath) + 1);
+	if (oldpath == NULL) {
+		ret.errno = ENOMEM;
+		return ret;
+	}
+
+	char *newpath = alloc(strlen(unewpath) + 1);
+	if (newpath == NULL) {
+		free(oldpath);
+		ret.errno = ENOMEM;
+		return ret;
+	}
+
+	// TODO safe strcopy
+	strcpy(oldpath, uoldpath);
+	strcpy(newpath, unewpath);
+
+	vnode_t *olddirnode = NULL;
+	file_t *oldfile = NULL;
+	vnode_t *newdirnode = NULL;
+	file_t *newfile = NULL;
+	vnode_t *targetdirnode = NULL;
+	vnode_t *sourcedirnode = NULL;
+	ret.errno = dirfd_enter(oldpath, olddirfd, &oldfile, &olddirnode);
+
+	if (ret.errno)
+		goto cleanup;
+
+	ret.errno = dirfd_enter(newpath, newdirfd, &newfile, &newdirnode);
+
+	if (ret.errno)
+		goto cleanup;
+
+	oldcomponent = alloc(strlen(oldpath));
+	newcomponent = alloc(strlen(newpath));
+
+	if (oldcomponent == NULL && newcomponent == NULL)
+		goto cleanup;
+
+	ret.errno = vfs_lookup(&sourcedirnode, olddirnode, oldpath, oldcomponent, VFS_LOOKUP_NOLINK | VFS_LOOKUP_PARENT);
+	if (ret.errno)
+		goto cleanup;
+
+	ret.errno = vfs_lookup(&targetdirnode, newdirnode, newpath, newcomponent, VFS_LOOKUP_NOLINK | VFS_LOOKUP_PARENT);
+	if (ret.errno)
+		goto cleanup;
+
+	ret.errno = VOP_RENAME(sourcedirnode, oldcomponent, targetdirnode, newcomponent, flags);
+	ret.ret = ret.errno ? -1 : 0;
+
+	cleanup:
+
+	if (targetdirnode)
+		VOP_RELEASE(targetdirnode);
+
+	if (sourcedirnode)
+		VOP_RELEASE(sourcedirnode);
+
+	if (oldcomponent)
+		free(oldcomponent);
+
+	if (newcomponent)
+		free(newcomponent);
+
+	if (olddirnode)
+		dirfd_leave(olddirnode, oldfile);
+
+	if (newdirnode)
+		dirfd_leave(newdirnode, newfile);
+
+	free(oldpath);
+	free(newpath);
+
+	return ret;
+}