fs/9p/9p.c

   1 /*
   2  *  linux/fs/9p/9p.c
   3  *
   4  *  This file contains functions to perform synchronous 9P calls
   5  *
   6  *  Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
   7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to:
  22  *  Free Software Foundation
  23  *  51 Franklin Street, Fifth Floor
  24  *  Boston, MA  02111-1301  USA
  25  *
  26  */
  27
  28 #include <linux/config.h>
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/fs.h>
  32 #include <linux/idr.h>
  33
  34 #include "debug.h"
  35 #include "v9fs.h"
  36 #include "9p.h"
  37 #include "conv.h"
  38 #include "mux.h"
  39
  40 /**
  41  * v9fs_t_version - negotiate protocol parameters with sever
  42  * @v9ses: 9P2000 session information
  43  * @msize: requested max size packet
  44  * @version: requested version.extension string
  45  * @fcall: pointer to response fcall pointer
  46  *
  47  */
  48
  49 int
  50 v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
  51                char *version, struct v9fs_fcall **rcp)
  52 {
  53         int ret;
  54         struct v9fs_fcall *tc;
  55
  56         dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
  57         tc = v9fs_create_tversion(msize, version);
  58
  59         if (!IS_ERR(tc)) {
  60                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
  61                 kfree(tc);
  62         } else
  63                 ret = PTR_ERR(tc);
  64
  65         return ret;
  66 }
  67
  68 /**
  69  * v9fs_t_attach - mount the server
  70  * @v9ses: 9P2000 session information
  71  * @uname: user name doing the attach
  72  * @aname: remote name being attached to
  73  * @fid: mount fid to attatch to root node
  74  * @afid: authentication fid (in this case result key)
  75  * @fcall: pointer to response fcall pointer
  76  *
  77  */
  78
  79 int
  80 v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
  81               u32 fid, u32 afid, struct v9fs_fcall **rcp)
  82 {
  83         int ret;
  84         struct v9fs_fcall* tc;
  85
  86         dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
  87                 aname, fid, afid);
  88
  89         tc = v9fs_create_tattach(fid, afid, uname, aname);
  90         if (!IS_ERR(tc)) {
  91                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
  92                 kfree(tc);
  93         } else
  94                 ret = PTR_ERR(tc);
  95
  96         return ret;
  97 }
  98
  99 static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc,
 100         struct v9fs_fcall *rc, int err)
 101 {
 102         int fid;
 103         struct v9fs_session_info *v9ses;
 104
 105         if (err)
 106                 return;
 107
 108         fid = tc->params.tclunk.fid;
 109         kfree(tc);
 110
 111         if (!rc)
 112                 return;
 113
 114         v9ses = a;
 115         if (rc->id == RCLUNK)
 116                 v9fs_put_idpool(fid, &v9ses->fidpool);
 117
 118         kfree(rc);
 119 }
 120
 121 /**
 122  * v9fs_t_clunk - release a fid (finish a transaction)
 123  * @v9ses: 9P2000 session information
 124  * @fid: fid to release
 125  * @fcall: pointer to response fcall pointer
 126  *
 127  */
 128
 129 int
 130 v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
 131 {
 132         int ret;
 133         struct v9fs_fcall *tc, *rc;
 134
 135         dprintk(DEBUG_9P, "fid %d\n", fid);
 136
 137         rc = NULL;
 138         tc = v9fs_create_tclunk(fid);
 139         if (!IS_ERR(tc))
 140                 ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 141         else
 142                 ret = PTR_ERR(tc);
 143
 144         if (ret)
 145                 dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
 146
 147         v9fs_t_clunk_cb(v9ses, tc, rc, ret);
 148         return ret;
 149 }
 150
 151 #if 0
 152 /**
 153  * v9fs_v9fs_t_flush - flush a pending transaction
 154  * @v9ses: 9P2000 session information
 155  * @tag: tag to release
 156  *
 157  */
 158
 159 int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag)
 160 {
 161         int ret;
 162         struct v9fs_fcall *tc;
 163
 164         dprintk(DEBUG_9P, "oldtag %d\n", oldtag);
 165
 166         tc = v9fs_create_tflush(oldtag);
 167         if (!IS_ERR(tc)) {
 168                 ret = v9fs_mux_rpc(v9ses->mux, tc, NULL);
 169                 kfree(tc);
 170         } else
 171                 ret = PTR_ERR(tc);
 172
 173         return ret;
 174 }
 175 #endif  /*  0  */
 176
 177 /**
 178  * v9fs_t_stat - read a file's meta-data
 179  * @v9ses: 9P2000 session information
 180  * @fid: fid pointing to file or directory to get info about
 181  * @fcall: pointer to response fcall
 182  *
 183  */
 184
 185 int
 186 v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **rcp)
 187 {
 188         int ret;
 189         struct v9fs_fcall *tc;
 190
 191         dprintk(DEBUG_9P, "fid %d\n", fid);
 192
 193         ret = -ENOMEM;
 194         tc = v9fs_create_tstat(fid);
 195         if (!IS_ERR(tc)) {
 196                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 197                 kfree(tc);
 198         } else
 199                 ret = PTR_ERR(tc);
 200
 201         return ret;
 202 }
 203
 204 /**
 205  * v9fs_t_wstat - write a file's meta-data
 206  * @v9ses: 9P2000 session information
 207  * @fid: fid pointing to file or directory to write info about
 208  * @stat: metadata
 209  * @fcall: pointer to response fcall
 210  *
 211  */
 212
 213 int
 214 v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
 215              struct v9fs_wstat *wstat, struct v9fs_fcall **rcp)
 216 {
 217         int ret;
 218         struct v9fs_fcall *tc;
 219
 220         dprintk(DEBUG_9P, "fid %d\n", fid);
 221
 222         tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
 223         if (!IS_ERR(tc)) {
 224                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 225                 kfree(tc);
 226         } else
 227                 ret = PTR_ERR(tc);
 228
 229         return ret;
 230 }
 231
 232 /**
 233  * v9fs_t_walk - walk a fid to a new file or directory
 234  * @v9ses: 9P2000 session information
 235  * @fid: fid to walk
 236  * @newfid: new fid (for clone operations)
 237  * @name: path to walk fid to
 238  * @fcall: pointer to response fcall
 239  *
 240  */
 241
 242 /* TODO: support multiple walk */
 243
 244 int
 245 v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
 246             char *name, struct v9fs_fcall **rcp)
 247 {
 248         int ret;
 249         struct v9fs_fcall *tc;
 250         int nwname;
 251
 252         dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
 253
 254         if (name)
 255                 nwname = 1;
 256         else
 257                 nwname = 0;
 258
 259         tc = v9fs_create_twalk(fid, newfid, nwname, &name);
 260         if (!IS_ERR(tc)) {
 261                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 262                 kfree(tc);
 263         } else
 264                 ret = PTR_ERR(tc);
 265
 266         return ret;
 267 }
 268
 269 /**
 270  * v9fs_t_open - open a file
 271  *
 272  * @v9ses - 9P2000 session information
 273  * @fid - fid to open
 274  * @mode - mode to open file (R, RW, etc)
 275  * @fcall - pointer to response fcall
 276  *
 277  */
 278
 279 int
 280 v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
 281             struct v9fs_fcall **rcp)
 282 {
 283         int ret;
 284         struct v9fs_fcall *tc;
 285
 286         dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
 287
 288         tc = v9fs_create_topen(fid, mode);
 289         if (!IS_ERR(tc)) {
 290                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 291                 kfree(tc);
 292         } else
 293                 ret = PTR_ERR(tc);
 294
 295         return ret;
 296 }
 297
 298 /**
 299  * v9fs_t_remove - remove a file or directory
 300  * @v9ses: 9P2000 session information
 301  * @fid: fid to remove
 302  * @fcall: pointer to response fcall
 303  *
 304  */
 305
 306 int
 307 v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
 308               struct v9fs_fcall **rcp)
 309 {
 310         int ret;
 311         struct v9fs_fcall *tc;
 312
 313         dprintk(DEBUG_9P, "fid %d\n", fid);
 314
 315         tc = v9fs_create_tremove(fid);
 316         if (!IS_ERR(tc)) {
 317                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 318                 kfree(tc);
 319         } else
 320                 ret = PTR_ERR(tc);
 321
 322         return ret;
 323 }
 324
 325 /**
 326  * v9fs_t_create - create a file or directory
 327  * @v9ses: 9P2000 session information
 328  * @fid: fid to create
 329  * @name: name of the file or directory to create
 330  * @perm: permissions to create with
 331  * @mode: mode to open file (R, RW, etc)
 332  * @fcall: pointer to response fcall
 333  *
 334  */
 335
 336 int
 337 v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name, u32 perm,
 338         u8 mode, char *extension, struct v9fs_fcall **rcp)
 339 {
 340         int ret;
 341         struct v9fs_fcall *tc;
 342
 343         dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
 344                 fid, name, perm, mode);
 345
 346         tc = v9fs_create_tcreate(fid, name, perm, mode, extension,
 347                 v9ses->extended);
 348
 349         if (!IS_ERR(tc)) {
 350                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 351                 kfree(tc);
 352         } else
 353                 ret = PTR_ERR(tc);
 354
 355         return ret;
 356 }
 357
 358 /**
 359  * v9fs_t_read - read data
 360  * @v9ses: 9P2000 session information
 361  * @fid: fid to read from
 362  * @offset: offset to start read at
 363  * @count: how many bytes to read
 364  * @fcall: pointer to response fcall (with data)
 365  *
 366  */
 367
 368 int
 369 v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
 370             u32 count, struct v9fs_fcall **rcp)
 371 {
 372         int ret;
 373         struct v9fs_fcall *tc, *rc;
 374
 375         dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
 376                 (long long unsigned) offset, count);
 377
 378         tc = v9fs_create_tread(fid, offset, count);
 379         if (!IS_ERR(tc)) {
 380                 ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 381                 if (!ret)
 382                         ret = rc->params.rread.count;
 383                 if (rcp)
 384                         *rcp = rc;
 385                 else
 386                         kfree(rc);
 387
 388                 kfree(tc);
 389         } else
 390                 ret = PTR_ERR(tc);
 391
 392         return ret;
 393 }
 394
 395 /**
 396  * v9fs_t_write - write data
 397  * @v9ses: 9P2000 session information
 398  * @fid: fid to write to
 399  * @offset: offset to start write at
 400  * @count: how many bytes to write
 401  * @fcall: pointer to response fcall
 402  *
 403  */
 404
 405 int
 406 v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
 407         const char __user *data, struct v9fs_fcall **rcp)
 408 {
 409         int ret;
 410         struct v9fs_fcall *tc, *rc;
 411
 412         dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
 413                 (long long unsigned) offset, count);
 414
 415         tc = v9fs_create_twrite(fid, offset, count, data);
 416         if (!IS_ERR(tc)) {
 417                 ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 418
 419                 if (!ret)
 420                         ret = rc->params.rwrite.count;
 421                 if (rcp)
 422                         *rcp = rc;
 423                 else
 424                         kfree(rc);
 425
 426                 kfree(tc);
 427         } else
 428                 ret = PTR_ERR(tc);
 429
 430         return ret;
 431 }
 432