+
+int
+__vfs_do_open(struct v_file** file_out, const char* path, int options)
+{
+ char name_str[VFS_NAME_MAXLEN];
+ struct hstr name = HSTR(name_str, 0);
+ struct v_dnode *dentry, *file;
+ int errno;
+ if ((errno = vfs_walk(NULL, path, &dentry, &name, VFS_WALK_PARENT))) {
+ return ENOENT;
+ }
+
+ vfs_walk(dentry, name.value, &file, NULL, 0);
+
+ struct v_file* opened_file = 0;
+ if (!file) {
+ if ((options & FO_CREATE)) {
+ errno = dentry->inode->ops.create(dentry->inode, opened_file);
+ } else {
+ errno = ENOENT;
+ }
+ } else {
+ errno = vfs_open(file, &opened_file);
+ }
+
+ *file_out = opened_file;
+ return errno;
+}
+
+__DEFINE_LXSYSCALL2(int, open, const char*, path, int, options)
+{
+ struct v_file* opened_file;
+ int errno = __vfs_do_open(&opened_file, path, options), fd;
+
+ if (!errno && !(errno = vfs_alloc_fdslot(&fd))) {
+ struct v_fd* fd_s = vzalloc(sizeof(*fd_s));
+ fd_s->file = opened_file;
+ fd_s->pos = opened_file->inode->fsize & -((options & FO_APPEND) != 0);
+ __current->fdtable->fds[fd] = fd_s;
+ return fd;
+ }
+
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+#define GET_FD(fd, fd_s) \
+ (fd >= 0 && fd < VFS_MAX_FD && (fd_s = __current->fdtable->fds[fd]))
+
+__DEFINE_LXSYSCALL1(int, close, int, fd)
+{
+ struct v_fd* fd_s;
+ int errno;
+ if (!GET_FD(fd, fd_s)) {
+ errno = EBADF;
+ } else if (!(errno = vfs_close(fd_s->file))) {
+ vfree(fd_s);
+ __current->fdtable->fds[fd] = 0;
+ }
+
+ __current->k_status = errno;
+
+ return SYSCALL_ESTATUS(errno);
+}
+
+void
+__vfs_readdir_callback(struct dir_context* dctx,
+ const char* name,
+ const int len,
+ const int dtype)
+{
+ struct dirent* dent = (struct dirent*)dctx->cb_data;
+ strncpy(dent->d_name, name, DIRENT_NAME_MAX_LEN);
+ dent->d_nlen = len;
+ dent->d_type = dtype;
+}
+
+__DEFINE_LXSYSCALL2(int, readdir, int, fd, struct dirent*, dent)
+{
+ struct v_fd* fd_s;
+ int errno;
+ if (!GET_FD(fd, fd_s)) {
+ errno = EBADF;
+ } else if (!(fd_s->file->inode->itype & VFS_INODE_TYPE_DIR)) {
+ errno = ENOTDIR;
+ } else {
+ struct dir_context dctx =
+ (struct dir_context){ .cb_data = dent,
+ .index = dent->d_offset,
+ .read_complete_callback =
+ __vfs_readdir_callback };
+ if (dent->d_offset == 0) {
+ __vfs_readdir_callback(&dctx, vfs_dot.value, vfs_dot.len, 0);
+ } else if (dent->d_offset == 1) {
+ __vfs_readdir_callback(&dctx, vfs_ddot.value, vfs_ddot.len, 0);
+ } else {
+ dctx.index -= 2;
+ if ((errno = fd_s->file->ops.readdir(fd_s->file, &dctx))) {
+ goto done;
+ }
+ }
+ errno = 0;
+ dent->d_offset++;
+ }
+
+done:
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+__DEFINE_LXSYSCALL1(int, mkdir, const char*, path)
+{
+ struct v_dnode *parent, *dir;
+ struct hstr component = HSTR(valloc(VFS_NAME_MAXLEN), 0);
+ int errno = vfs_walk(NULL, path, &parent, &component, VFS_WALK_PARENT);
+ if (errno) {
+ goto done;
+ }
+
+ if ((parent->super_block->fs->types & FSTYPE_ROFS)) {
+ errno = ENOTSUP;
+ } else if (!parent->inode->ops.mkdir) {
+ errno = ENOTSUP;
+ } else if (!(parent->inode->itype & VFS_INODE_TYPE_DIR)) {
+ errno = ENOTDIR;
+ } else {
+ dir = vfs_d_alloc();
+ dir->name = component;
+ if (!(errno = parent->inode->ops.mkdir(parent->inode, dir))) {
+ llist_append(&parent->children, &dir->siblings);
+ } else {
+ vfs_d_free(dir);
+ vfree(component.value);
+ }
+ }
+
+done:
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+__DEFINE_LXSYSCALL3(int, read, int, fd, void*, buf, size_t, count)
+{
+ int errno = 0;
+ struct v_fd* fd_s;
+ if (!GET_FD(fd, fd_s)) {
+ errno = EBADF;
+ } else {
+ struct v_file* file = fd_s->file;
+ file->f_pos = fd_s->pos;
+ if ((errno = file->ops.read(file, buf, count)) >= 0) {
+ fd_s->pos += errno;
+ }
+ }
+
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+__DEFINE_LXSYSCALL3(int, write, int, fd, void*, buf, size_t, count)
+{
+ int errno = 0;
+ struct v_fd* fd_s;
+ if (!GET_FD(fd, fd_s)) {
+ errno = EBADF;
+ } else {
+ struct v_file* file = fd_s->file;
+ file->f_pos = fd_s->pos;
+ if ((errno = file->ops.write(file, buf, count)) >= 0) {
+ fd_s->pos += errno;
+ }
+ }
+
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+__DEFINE_LXSYSCALL3(int, lseek, int, fd, int, offset, int, options)
+{
+ int errno = 0;
+ struct v_fd* fd_s;
+ if (!GET_FD(fd, fd_s)) {
+ errno = EBADF;
+ } else {
+ size_t fpos = fd_s->file->f_pos;
+ switch (options) {
+ case FSEEK_CUR:
+ fpos = (size_t)((int)fd_s->file->f_pos + offset);
+ break;
+ case FSEEK_END:
+ fpos = (size_t)((int)fd_s->file->inode->fsize + offset);
+ break;
+ case FSEEK_SET:
+ fpos = offset;
+ break;
+
+ default:
+ break;
+ }
+ fd_s->pos = fpos;
+ }
+
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+int
+vfs_readlink(struct v_dnode* dnode, char* buf, size_t size, int depth)
+{
+ if (!dnode) {
+ return 0;
+ }
+
+ if (depth > 64) {
+ return ELOOP;
+ }
+
+ size_t len = vfs_readlink(dnode->parent, buf, size, depth + 1);
+
+ if (len >= size) {
+ return len;
+ }
+
+ size_t cpy_size = MIN(dnode->name.len, size - len);
+ strncpy(buf + len, dnode->name.value, cpy_size);
+ len += cpy_size;
+
+ if (len < size) {
+ buf[len++] = PATH_DELIM;
+ }
+
+ return len;
+}
+
+__DEFINE_LXSYSCALL3(int, readlink, const char*, path, char*, buf, size_t, size)
+{
+ int errno;
+ struct v_dnode* dnode;
+ if (!(errno = vfs_walk(NULL, path, &dnode, NULL, 0))) {
+ errno = vfs_readlink(dnode, buf, size, 0);
+ }
+
+ if (errno >= 0) {
+ return errno;
+ }
+
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
+
+__DEFINE_LXSYSCALL4(int,
+ readlinkat,
+ int,
+ dirfd,
+ const char*,
+ pathname,
+ char*,
+ buf,
+ size_t,
+ size)
+{
+ int errno;
+ struct v_fd* fd_s;
+ if (!GET_FD(dirfd, fd_s)) {
+ errno = EBADF;
+ } else {
+ struct v_dnode* dnode;
+ if (!(errno = vfs_walk(fd_s->file->dnode, pathname, &dnode, NULL, 0))) {
+ errno = vfs_readlink(fd_s->file->dnode, buf, size, 0);
+ }
+ }
+
+ if (errno >= 0) {
+ return errno;
+ }
+
+ __current->k_status = errno;
+ return SYSCALL_ESTATUS(errno);
+}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff