Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/vfs_dir.c |
| 3 | * |
| 4 | * This file contains vfs directory ops for the 9P2000 protocol. |
| 5 | * |
| 6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to: |
| 21 | * Free Software Foundation |
| 22 | * 51 Franklin Street, Fifth Floor |
| 23 | * Boston, MA 02111-1301 USA |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/file.h> |
| 31 | #include <linux/stat.h> |
| 32 | #include <linux/string.h> |
| 33 | #include <linux/smp_lock.h> |
| 34 | #include <linux/inet.h> |
| 35 | #include <linux/idr.h> |
| 36 | |
| 37 | #include "debug.h" |
| 38 | #include "v9fs.h" |
| 39 | #include "9p.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 40 | #include "conv.h" |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 41 | #include "v9fs_vfs.h" |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 42 | #include "fid.h" |
| 43 | |
| 44 | /** |
| 45 | * dt_type - return file type |
| 46 | * @mistat: mistat structure |
| 47 | * |
| 48 | */ |
| 49 | |
| 50 | static inline int dt_type(struct v9fs_stat *mistat) |
| 51 | { |
| 52 | unsigned long perm = mistat->mode; |
| 53 | int rettype = DT_REG; |
| 54 | |
| 55 | if (perm & V9FS_DMDIR) |
| 56 | rettype = DT_DIR; |
| 57 | if (perm & V9FS_DMSYMLINK) |
| 58 | rettype = DT_LNK; |
| 59 | |
| 60 | return rettype; |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * v9fs_dir_readdir - read a directory |
| 65 | * @filep: opened file structure |
| 66 | * @dirent: directory structure ??? |
| 67 | * @filldir: function to populate directory structure ??? |
| 68 | * |
| 69 | */ |
| 70 | |
| 71 | static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 72 | { |
| 73 | struct v9fs_fcall *fcall = NULL; |
| 74 | struct inode *inode = filp->f_dentry->d_inode; |
| 75 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| 76 | struct v9fs_fid *file = filp->private_data; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 77 | unsigned int i, n, s; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 78 | int fid = -1; |
| 79 | int ret = 0; |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 80 | struct v9fs_stat stat; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 81 | int over = 0; |
| 82 | |
| 83 | dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name); |
| 84 | |
| 85 | fid = file->fid; |
| 86 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 87 | if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) { |
| 88 | kfree(file->rdir_fcall); |
| 89 | file->rdir_fcall = NULL; |
| 90 | } |
| 91 | |
| 92 | if (file->rdir_fcall) { |
| 93 | n = file->rdir_fcall->params.rread.count; |
| 94 | i = file->rdir_fpos; |
| 95 | while (i < n) { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 96 | s = v9fs_deserialize_stat( |
| 97 | file->rdir_fcall->params.rread.data + i, |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 98 | n - i, &stat, v9ses->extended); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 99 | |
| 100 | if (s == 0) { |
| 101 | dprintk(DEBUG_ERROR, |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 102 | "error while deserializing stat\n"); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 103 | ret = -EIO; |
| 104 | goto FreeStructs; |
| 105 | } |
| 106 | |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 107 | over = filldir(dirent, stat.name.str, stat.name.len, |
| 108 | filp->f_pos, v9fs_qid2ino(&stat.qid), |
| 109 | dt_type(&stat)); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 110 | |
| 111 | if (over) { |
| 112 | file->rdir_fpos = i; |
| 113 | file->rdir_pos = filp->f_pos; |
| 114 | break; |
| 115 | } |
| 116 | |
| 117 | i += s; |
| 118 | filp->f_pos += s; |
| 119 | } |
| 120 | |
| 121 | if (!over) { |
| 122 | kfree(file->rdir_fcall); |
| 123 | file->rdir_fcall = NULL; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | while (!over) { |
| 128 | ret = v9fs_t_read(v9ses, fid, filp->f_pos, |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 129 | v9ses->maxdata-V9FS_IOHDRSZ, &fcall); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 130 | if (ret < 0) { |
| 131 | dprintk(DEBUG_ERROR, "error while reading: %d: %p\n", |
| 132 | ret, fcall); |
| 133 | goto FreeStructs; |
| 134 | } else if (ret == 0) |
| 135 | break; |
| 136 | |
| 137 | n = ret; |
| 138 | i = 0; |
| 139 | while (i < n) { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 140 | s = v9fs_deserialize_stat(fcall->params.rread.data + i, |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 141 | n - i, &stat, v9ses->extended); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 142 | |
| 143 | if (s == 0) { |
| 144 | dprintk(DEBUG_ERROR, |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 145 | "error while deserializing stat\n"); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 146 | return -EIO; |
| 147 | } |
| 148 | |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 149 | over = filldir(dirent, stat.name.str, stat.name.len, |
| 150 | filp->f_pos, v9fs_qid2ino(&stat.qid), |
| 151 | dt_type(&stat)); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 152 | |
| 153 | if (over) { |
| 154 | file->rdir_fcall = fcall; |
| 155 | file->rdir_fpos = i; |
| 156 | file->rdir_pos = filp->f_pos; |
| 157 | fcall = NULL; |
| 158 | break; |
| 159 | } |
| 160 | |
| 161 | i += s; |
| 162 | filp->f_pos += s; |
| 163 | } |
| 164 | |
| 165 | kfree(fcall); |
| 166 | } |
| 167 | |
| 168 | FreeStructs: |
| 169 | kfree(fcall); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 170 | return ret; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * v9fs_dir_release - close a directory |
| 175 | * @inode: inode of the directory |
| 176 | * @filp: file pointer to a directory |
| 177 | * |
| 178 | */ |
| 179 | |
| 180 | int v9fs_dir_release(struct inode *inode, struct file *filp) |
| 181 | { |
| 182 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| 183 | struct v9fs_fid *fid = filp->private_data; |
| 184 | int fidnum = -1; |
| 185 | |
| 186 | dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp, |
| 187 | fid->fid); |
| 188 | fidnum = fid->fid; |
| 189 | |
OGAWA Hirofumi | 28fd129 | 2006-01-08 01:02:14 -0800 | [diff] [blame] | 190 | filemap_write_and_wait(inode->i_mapping); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 191 | |
| 192 | if (fidnum >= 0) { |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 193 | dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen, |
| 194 | fid->fid); |
| 195 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 196 | if (v9fs_t_clunk(v9ses, fidnum)) |
Latchesar Ionkov | 0b8dd17 | 2005-09-27 21:45:24 -0700 | [diff] [blame] | 197 | dprintk(DEBUG_ERROR, "clunk failed\n"); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 198 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 199 | kfree(fid->rdir_fcall); |
Latchesar Ionkov | 0b8dd17 | 2005-09-27 21:45:24 -0700 | [diff] [blame] | 200 | kfree(fid); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 201 | |
| 202 | filp->private_data = NULL; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 203 | } |
| 204 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | struct file_operations v9fs_dir_operations = { |
| 209 | .read = generic_read_dir, |
| 210 | .readdir = v9fs_dir_readdir, |
| 211 | .open = v9fs_file_open, |
| 212 | .release = v9fs_dir_release, |
| 213 | }; |