/* * 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/smp_lock.h> #include <linux/sched.h> #include <linux/inet.h> #include <linux/idr.h> #include "debug.h" #include "v9fs.h" #include "9p.h" #include "conv.h" #include "v9fs_vfs.h" #include "fid.h" /** * dt_type - return file type * @mistat: mistat structure * */ static inline int dt_type(struct v9fs_stat *mistat) { unsigned long perm = mistat->mode; int rettype = DT_REG; if (perm & V9FS_DMDIR) rettype = DT_DIR; if (perm & V9FS_DMSYMLINK) rettype = DT_LNK; return rettype; } /** * v9fs_dir_readdir - read a directory * @filep: 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) { struct v9fs_fcall *fcall = NULL; struct inode *inode = filp->f_path.dentry->d_inode; struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); struct v9fs_fid *file = filp->private_data; unsigned int i, n, s; int fid = -1; int ret = 0; struct v9fs_stat stat; int over = 0; dprintk(DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name); fid = file->fid; if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) { kfree(file->rdir_fcall); file->rdir_fcall = NULL; } if (file->rdir_fcall) { n = file->rdir_fcall->params.rread.count; i = file->rdir_fpos; while (i < n) { s = v9fs_deserialize_stat( file->rdir_fcall->params.rread.data + i, n - i, &stat, v9ses->extended); if (s == 0) { dprintk(DEBUG_ERROR, "error while deserializing stat\n"); ret = -EIO; goto FreeStructs; } over = filldir(dirent, stat.name.str, stat.name.len, filp->f_pos, v9fs_qid2ino(&stat.qid), dt_type(&stat)); if (over) { file->rdir_fpos = i; file->rdir_pos = filp->f_pos; break; } i += s; filp->f_pos += s; } if (!over) { kfree(file->rdir_fcall); file->rdir_fcall = NULL; } } while (!over) { ret = v9fs_t_read(v9ses, fid, filp->f_pos, v9ses->maxdata-V9FS_IOHDRSZ, &fcall); if (ret < 0) { dprintk(DEBUG_ERROR, "error while reading: %d: %p\n", ret, fcall); goto FreeStructs; } else if (ret == 0) break; n = ret; i = 0; while (i < n) { s = v9fs_deserialize_stat(fcall->params.rread.data + i, n - i, &stat, v9ses->extended); if (s == 0) { dprintk(DEBUG_ERROR, "error while deserializing stat\n"); return -EIO; } over = filldir(dirent, stat.name.str, stat.name.len, filp->f_pos, v9fs_qid2ino(&stat.qid), dt_type(&stat)); if (over) { file->rdir_fcall = fcall; file->rdir_fpos = i; file->rdir_pos = filp->f_pos; fcall = NULL; break; } i += s; filp->f_pos += s; } kfree(fcall); } FreeStructs: kfree(fcall); return ret; } /** * 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 v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); struct v9fs_fid *fid = filp->private_data; int fidnum = -1; dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid); fidnum = fid->fid; filemap_write_and_wait(inode->i_mapping); if (fidnum >= 0) { dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen, fid->fid); if (v9fs_t_clunk(v9ses, fidnum)) dprintk(DEBUG_ERROR, "clunk failed\n"); kfree(fid->rdir_fcall); kfree(fid); filp->private_data = NULL; } return 0; } const struct file_operations v9fs_dir_operations = { .read = generic_read_dir, .readdir = v9fs_dir_readdir, .open = v9fs_file_open, .release = v9fs_dir_release, };