/* * linux/fs/9p/vfs_dir.c * * This file contains vfs directory ops for the 9P2000 protocol. * * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/file.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/sched.h> #include <linux/inet.h> #include <linux/idr.h> #include <net/9p/9p.h> #include <net/9p/client.h> #include "v9fs.h" #include "v9fs_vfs.h" #include "fid.h" /** * dt_type - return file type * @mistat: mistat structure * */ static inline int dt_type(struct p9_wstat *mistat) { unsigned long perm = mistat->mode; int rettype = DT_REG; if (perm & P9_DMDIR) rettype = DT_DIR; if (perm & P9_DMSYMLINK) rettype = DT_LNK; return rettype; } /** * v9fs_dir_readdir - read a directory * @filp: opened file structure * @dirent: directory structure ??? * @filldir: function to populate directory structure ??? * */ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir) { int over; struct p9_wstat st; int err; struct p9_fid *fid; int buflen; char *statbuf; int n, i = 0; P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name); fid = filp->private_data; buflen = fid->clnt->msize - P9_IOHDRSZ; statbuf = kmalloc(buflen, GFP_KERNEL); if (!statbuf) return -ENOMEM; while (1) { err = v9fs_file_readn(filp, statbuf, NULL, buflen, fid->rdir_fpos); if (err <= 0) break; n = err; while (i < n) { err = p9stat_read(statbuf + i, buflen-i, &st, fid->clnt->dotu); if (err) { P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err); err = -EIO; p9stat_free(&st); goto free_and_exit; } i += st.size+2; fid->rdir_fpos += st.size+2; over = filldir(dirent, st.name, strlen(st.name), filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st)); filp->f_pos += st.size+2; p9stat_free(&st); if (over) { err = 0; goto free_and_exit; } } } free_and_exit: kfree(statbuf); return err; } /** * v9fs_dir_release - close a directory * @inode: inode of the directory * @filp: file pointer to a directory * */ int v9fs_dir_release(struct inode *inode, struct file *filp) { struct p9_fid *fid; fid = filp->private_data; P9_DPRINTK(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid); filemap_write_and_wait(inode->i_mapping); p9_client_clunk(fid); return 0; } const struct file_operations v9fs_dir_operations = { .read = generic_read_dir, .llseek = generic_file_llseek, .readdir = v9fs_dir_readdir, .open = v9fs_file_open, .release = v9fs_dir_release, };