Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/vfs_file.c |
| 3 | * |
| 4 | * This file contians vfs file ops for 9P2000. |
| 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 |
Eric Van Hensbergen | 42e8c50 | 2006-03-25 03:07:28 -0800 | [diff] [blame] | 10 | * it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation. |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to: |
| 20 | * Free Software Foundation |
| 21 | * 51 Franklin Street, Fifth Floor |
| 22 | * Boston, MA 02111-1301 USA |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/file.h> |
| 30 | #include <linux/stat.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/smp_lock.h> |
| 33 | #include <linux/inet.h> |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 34 | #include <linux/version.h> |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 35 | #include <linux/list.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | #include <linux/idr.h> |
| 38 | |
| 39 | #include "debug.h" |
| 40 | #include "v9fs.h" |
| 41 | #include "9p.h" |
| 42 | #include "v9fs_vfs.h" |
| 43 | #include "fid.h" |
| 44 | |
| 45 | /** |
| 46 | * v9fs_file_open - open a file (or directory) |
| 47 | * @inode: inode to be opened |
| 48 | * @file: file being opened |
| 49 | * |
| 50 | */ |
| 51 | |
| 52 | int v9fs_file_open(struct inode *inode, struct file *file) |
| 53 | { |
| 54 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 55 | struct v9fs_fid *vfid; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 56 | struct v9fs_fcall *fcall = NULL; |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 57 | int omode; |
| 58 | int fid = V9FS_NOFID; |
| 59 | int err; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 60 | |
Latchesar Ionkov | 0b8dd17 | 2005-09-27 21:45:24 -0700 | [diff] [blame] | 61 | dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
| 62 | |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 63 | vfid = v9fs_fid_lookup(file->f_dentry); |
| 64 | if (!vfid) { |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 65 | dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n"); |
Latchesar Ionkov | 0b8dd17 | 2005-09-27 21:45:24 -0700 | [diff] [blame] | 66 | return -EBADF; |
| 67 | } |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 68 | |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 69 | fid = v9fs_get_idpool(&v9ses->fidpool); |
| 70 | if (fid < 0) { |
Latchesar Ionkov | 16cce6d | 2006-03-25 03:07:26 -0800 | [diff] [blame] | 71 | eprintk(KERN_WARNING, "newfid fails!\n"); |
| 72 | return -ENOSPC; |
| 73 | } |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 74 | |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 75 | err = v9fs_t_walk(v9ses, vfid->fid, fid, NULL, NULL); |
| 76 | if (err < 0) { |
Latchesar Ionkov | 16cce6d | 2006-03-25 03:07:26 -0800 | [diff] [blame] | 77 | dprintk(DEBUG_ERROR, "rewalk didn't work\n"); |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 78 | goto put_fid; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 79 | } |
| 80 | |
Latchesar Ionkov | 16cce6d | 2006-03-25 03:07:26 -0800 | [diff] [blame] | 81 | /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */ |
| 82 | /* translate open mode appropriately */ |
| 83 | omode = v9fs_uflags2omode(file->f_flags); |
| 84 | err = v9fs_t_open(v9ses, fid, omode, &fcall); |
| 85 | if (err < 0) { |
| 86 | PRINT_FCALL_ERROR("open failed", fcall); |
| 87 | goto clunk_fid; |
| 88 | } |
| 89 | |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 90 | vfid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL); |
| 91 | if (vfid == NULL) { |
| 92 | dprintk(DEBUG_ERROR, "out of memory\n"); |
Latchesar Ionkov | 16cce6d | 2006-03-25 03:07:26 -0800 | [diff] [blame] | 93 | err = -ENOMEM; |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 94 | goto clunk_fid; |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | file->private_data = vfid; |
| 98 | vfid->fid = fid; |
| 99 | vfid->fidopen = 1; |
| 100 | vfid->fidclunked = 0; |
| 101 | vfid->iounit = fcall->params.ropen.iounit; |
| 102 | vfid->rdir_pos = 0; |
| 103 | vfid->rdir_fcall = NULL; |
| 104 | vfid->filp = file; |
| 105 | kfree(fcall); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 106 | |
| 107 | return 0; |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 108 | |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 109 | clunk_fid: |
| 110 | v9fs_t_clunk(v9ses, fid); |
| 111 | |
| 112 | put_fid: |
| 113 | v9fs_put_idpool(fid, &v9ses->fidpool); |
Latchesar Ionkov | 16cce6d | 2006-03-25 03:07:26 -0800 | [diff] [blame] | 114 | kfree(fcall); |
Latchesar Ionkov | 6a3124a | 2006-03-02 02:54:30 -0800 | [diff] [blame] | 115 | |
| 116 | return err; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | /** |
| 120 | * v9fs_file_lock - lock a file (or directory) |
| 121 | * @inode: inode to be opened |
| 122 | * @file: file being opened |
| 123 | * |
| 124 | * XXX - this looks like a local only lock, we should extend into 9P |
| 125 | * by using open exclusive |
| 126 | */ |
| 127 | |
| 128 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) |
| 129 | { |
| 130 | int res = 0; |
| 131 | struct inode *inode = filp->f_dentry->d_inode; |
| 132 | |
| 133 | dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
| 134 | |
| 135 | /* No mandatory locks */ |
| 136 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
| 137 | return -ENOLCK; |
| 138 | |
| 139 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { |
OGAWA Hirofumi | 28fd129 | 2006-01-08 01:02:14 -0800 | [diff] [blame] | 140 | filemap_write_and_wait(inode->i_mapping); |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 141 | invalidate_inode_pages(&inode->i_data); |
| 142 | } |
| 143 | |
| 144 | return res; |
| 145 | } |
| 146 | |
| 147 | /** |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 148 | * v9fs_file_read - read from a file |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 149 | * @filep: file pointer to read |
| 150 | * @data: data buffer to read data into |
| 151 | * @count: size of buffer |
| 152 | * @offset: offset at which to read data |
| 153 | * |
| 154 | */ |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 155 | static ssize_t |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 156 | v9fs_file_read(struct file *filp, char __user * data, size_t count, |
| 157 | loff_t * offset) |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 158 | { |
| 159 | struct inode *inode = filp->f_dentry->d_inode; |
| 160 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| 161 | struct v9fs_fid *v9f = filp->private_data; |
| 162 | struct v9fs_fcall *fcall = NULL; |
| 163 | int fid = v9f->fid; |
| 164 | int rsize = 0; |
| 165 | int result = 0; |
| 166 | int total = 0; |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 167 | int n; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 168 | |
| 169 | dprintk(DEBUG_VFS, "\n"); |
| 170 | |
| 171 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; |
| 172 | if (v9f->iounit != 0 && rsize > v9f->iounit) |
| 173 | rsize = v9f->iounit; |
| 174 | |
| 175 | do { |
| 176 | if (count < rsize) |
| 177 | rsize = count; |
| 178 | |
| 179 | result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); |
| 180 | |
| 181 | if (result < 0) { |
| 182 | printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", |
| 183 | result); |
| 184 | |
| 185 | kfree(fcall); |
| 186 | return total; |
| 187 | } else |
| 188 | *offset += result; |
| 189 | |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 190 | n = copy_to_user(data, fcall->params.rread.data, result); |
| 191 | if (n) { |
| 192 | dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n); |
| 193 | kfree(fcall); |
| 194 | return -EFAULT; |
| 195 | } |
| 196 | |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 197 | count -= result; |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 198 | data += result; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 199 | total += result; |
| 200 | |
| 201 | kfree(fcall); |
| 202 | |
| 203 | if (result < rsize) |
| 204 | break; |
| 205 | } while (count); |
| 206 | |
| 207 | return total; |
| 208 | } |
| 209 | |
| 210 | /** |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 211 | * v9fs_file_write - write to a file |
| 212 | * @filep: file pointer to write |
| 213 | * @data: data buffer to write data from |
| 214 | * @count: size of buffer |
| 215 | * @offset: offset at which to write data |
| 216 | * |
| 217 | */ |
| 218 | |
| 219 | static ssize_t |
| 220 | v9fs_file_write(struct file *filp, const char __user * data, |
| 221 | size_t count, loff_t * offset) |
| 222 | { |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 223 | struct inode *inode = filp->f_dentry->d_inode; |
| 224 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| 225 | struct v9fs_fid *v9fid = filp->private_data; |
| 226 | struct v9fs_fcall *fcall; |
| 227 | int fid = v9fid->fid; |
| 228 | int result = -EIO; |
| 229 | int rsize = 0; |
| 230 | int total = 0; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 231 | |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 232 | dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, |
| 233 | (int)*offset); |
| 234 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; |
| 235 | if (v9fid->iounit != 0 && rsize > v9fid->iounit) |
| 236 | rsize = v9fid->iounit; |
| 237 | |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 238 | do { |
| 239 | if (count < rsize) |
| 240 | rsize = count; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 241 | |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 242 | result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall); |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 243 | if (result < 0) { |
Latchesar Ionkov | 531b109 | 2006-01-08 01:05:00 -0800 | [diff] [blame] | 244 | PRINT_FCALL_ERROR("error while writing", fcall); |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 245 | kfree(fcall); |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 246 | return result; |
| 247 | } else |
| 248 | *offset += result; |
| 249 | |
| 250 | kfree(fcall); |
| 251 | fcall = NULL; |
| 252 | |
| 253 | if (result != rsize) { |
| 254 | eprintk(KERN_ERR, |
| 255 | "short write: v9fs_t_write returned %d\n", |
| 256 | result); |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | count -= result; |
| 261 | data += result; |
| 262 | total += result; |
| 263 | } while (count); |
| 264 | |
Eric Van Hensbergen | 147b31c | 2006-01-18 17:43:02 -0800 | [diff] [blame] | 265 | invalidate_inode_pages2(inode->i_mapping); |
Latchesar Ionkov | 19cba8a | 2005-10-11 08:29:03 -0700 | [diff] [blame] | 266 | return total; |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 267 | } |
| 268 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 269 | const struct file_operations v9fs_file_operations = { |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 270 | .llseek = generic_file_llseek, |
| 271 | .read = v9fs_file_read, |
| 272 | .write = v9fs_file_write, |
| 273 | .open = v9fs_file_open, |
| 274 | .release = v9fs_dir_release, |
| 275 | .lock = v9fs_file_lock, |
Eric Van Hensbergen | 147b31c | 2006-01-18 17:43:02 -0800 | [diff] [blame] | 276 | .mmap = generic_file_mmap, |
Eric Van Hensbergen | e69e7fe | 2005-09-09 13:04:18 -0700 | [diff] [blame] | 277 | }; |