+}
+
+int
+vfs_do_rename(struct v_dnode* current, struct v_dnode* target)
+{
+ int errno = 0;
+ if (current->inode->id == target->inode->id) {
+ // hard link
+ return 0;
+ }
+
+ if ((errno = vfs_check_writable(current))) {
+ return errno;
+ }
+
+ if (current->ref_count > 1 || target->ref_count > 1) {
+ return EBUSY;
+ }
+
+ if (current->super_block != target->super_block) {
+ return EXDEV;
+ }
+
+ struct v_dnode* oldparent = current->parent;
+ struct v_dnode* newparent = target->parent;
+
+ lock_dnode(current);
+ lock_dnode(target);
+
+ if (oldparent)
+ lock_dnode(oldparent);
+ if (newparent)
+ lock_dnode(newparent);
+
+ if (!llist_empty(&target->children)) {
+ errno = ENOTEMPTY;
+ unlock_dnode(target);
+ goto cleanup;
+ }
+
+ if ((errno =
+ current->inode->ops->rename(current->inode, current, target))) {
+ unlock_dnode(target);
+ goto cleanup;
+ }
+
+ // re-position current
+ hstrcpy(¤t->name, &target->name);
+ vfs_dcache_rehash(newparent, current);
+
+ // detach target
+ vfs_d_free(target);
+
+ unlock_dnode(target);
+
+cleanup:
+ unlock_dnode(current);
+
+ if (oldparent)
+ unlock_dnode(oldparent);
+ if (newparent)
+ unlock_dnode(newparent);
+
+ return errno;
+}
+
+__DEFINE_LXSYSCALL2(int, rename, const char*, oldpath, const char*, newpath)
+{
+ struct v_dnode *cur, *target_parent, *target;
+ struct hstr name = HSTR(valloc(VFS_NAME_MAXLEN), 0);
+ int errno = 0;
+
+ if ((errno = vfs_walk_proc(oldpath, &cur, NULL, 0))) {
+ goto done;
+ }
+
+ if ((errno = vfs_walk(
+ __current->cwd, newpath, &target_parent, &name, VFS_WALK_PARENT))) {
+ goto done;
+ }
+
+ errno = vfs_walk(target_parent, name.value, &target, NULL, 0);
+ if (errno == ENOENT) {
+ target = vfs_d_alloc(target_parent, &name);
+ vfs_dcache_add(target_parent, target);
+ } else if (errno) {
+ goto done;
+ }
+
+ if (!target) {
+ errno = ENOMEM;
+ goto done;
+ }
+
+ errno = vfs_do_rename(cur, target);
+
+done:
+ vfree((void*)name.value);
+ return DO_STATUS(errno);
+}
+
+__DEFINE_LXSYSCALL2(int, fstat, int, fd, struct file_stat*, stat)
+{
+ int errno = 0;
+ struct v_fd* fds;
+
+ if ((errno = vfs_getfd(fd, &fds))) {
+ goto done;
+ }
+
+ struct v_inode* vino = fds->file->inode;
+ struct device* fdev = vino->sb->dev;
+
+ stat->st_ino = vino->id;
+ stat->st_blocks = vino->lb_usage;
+ stat->st_size = vino->fsize;
+ stat->st_blksize = vino->sb->blksize;
+ stat->st_nlink = vino->link_count;
+ stat->st_uid = vino->uid;
+ stat->st_gid = vino->gid;
+
+ stat->st_ctim = vino->ctime;
+ stat->st_atim = vino->atime;
+ stat->st_mtim = vino->mtime;
+
+ stat->st_mode = (vino->itype << 16) | vino->acl;
+
+ stat->st_ioblksize = PAGE_SIZE;
+
+ if (check_device_node(vino)) {
+ struct device* rdev = resolve_device(vino->data);
+ if (!rdev) {
+ errno = EINVAL;
+ goto done;
+ }
+
+ stat->st_rdev = (dev_t){.meta = rdev->ident.fn_grp,
+ .unique = rdev->ident.unique,
+ .index = dev_uid(rdev) };
+ }
+
+ if (fdev) {
+ stat->st_dev = (dev_t){.meta = fdev->ident.fn_grp,
+ .unique = fdev->ident.unique,
+ .index = dev_uid(fdev) };
+ }
+
+done:
+ return DO_STATUS(errno);
+}
+
+__DEFINE_LXSYSCALL4(int, fchmodat, int, fd,
+ const char*, path, int, mode, int, flags)
+{
+ int errno;
+ struct v_dnode *dnode;
+ struct v_inode* inode;
+
+ errno = vfs_walkat(fd, path, flags, &dnode);
+ if (errno) {
+ goto done;
+ }
+
+ errno = vfs_check_writable(dnode);
+ if (errno) {
+ return errno;
+ }
+
+ inode = dnode->inode;
+ lock_inode(inode);
+
+ if (!current_is_root()) {
+ mode = mode & FSACL_RWXMASK;
+ }
+
+ inode->acl = mode;
+ __vfs_touch_inode(inode, INODE_MODIFY);
+
+ unlock_inode(inode);
+
+done:
+ return DO_STATUS(errno);
+}
+
+__DEFINE_LXSYSCALL5(int, fchownat, int, fd,
+ const char*, path, uid_t, uid, gid_t, gid, int, flags)
+{
+ int errno;
+ struct v_dnode *dnode;
+ struct v_inode *inode;
+
+ errno = vfs_walkat(fd, path, flags, &dnode);
+ if (errno) {
+ goto done;
+ }
+
+ errno = vfs_check_writable(dnode);
+ if (errno) {
+ return errno;
+ }
+
+ inode = dnode->inode;
+ lock_inode(inode);
+
+ inode->uid = uid;
+ inode->gid = gid;
+ __vfs_touch_inode(inode, INODE_MODIFY);
+
+ unlock_inode(inode);
+
+done:
+ return DO_STATUS(errno);
+}
+
+__DEFINE_LXSYSCALL4(int, faccessat, int, fd,
+ const char*, path, int, amode, int, flags)
+{
+ int errno, acl;
+ struct v_dnode *dnode;
+ struct v_inode *inode;
+ struct user_scope* uscope;
+
+ uid_t tuid;
+ gid_t tgid;
+
+ errno = vfs_walkat(fd, path, flags, &dnode);
+ if (errno) {
+ goto done;
+ }
+
+ if ((flags & AT_EACCESS)) {
+ tuid = current_euid();
+ tgid = current_egid();
+ }
+ else {
+ uscope = current_user_scope();
+ tuid = uscope->ruid;
+ tgid = uscope->rgid;
+ }
+
+ inode = dnode->inode;
+
+ acl = inode->acl;
+ acl &= amode;
+ acl &= check_acl_between(inode->uid, inode->gid, tuid, tgid);
+ if (!acl) {
+ errno = EACCESS;
+ }
+
+done:
+ return DO_STATUS(errno);
git://scm.lunaixsky.com / lunaix-os.git / blobdiff