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         dprintk(DEBUG_9P, "tcall id %d rcall id %d\n", tc->id, rc->id);
 115         v9ses = a;
 116         if (rc->id == RCLUNK)
 117                 v9fs_put_idpool(fid, &v9ses->fidpool);
 118
 119         kfree(rc);
 120 }
 121
 122 /**
 123  * v9fs_t_clunk - release a fid (finish a transaction)
 124  * @v9ses: 9P2000 session information
 125  * @fid: fid to release
 126  * @fcall: pointer to response fcall pointer
 127  *
 128  */
 129
 130 int
 131 v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
 132 {
 133         int ret;
 134         struct v9fs_fcall *tc, *rc;
 135
 136         dprintk(DEBUG_9P, "fid %d\n", fid);
 137
 138         rc = NULL;
 139         tc = v9fs_create_tclunk(fid);
 140         if (!IS_ERR(tc))
 141                 ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 142         else
 143                 ret = PTR_ERR(tc);
 144
 145         if (ret)
 146                 dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
 147
 148         v9fs_t_clunk_cb(v9ses, tc, rc, ret);
 149         return ret;
 150 }
 151
 152 /**
 153  * v9fs_v9fs_t_flush - flush a pending transaction
 154  * @v9ses: 9P2000 session information
 155  * @tag: tid 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
 176 /**
 177  * v9fs_t_stat - read a file's meta-data
 178  * @v9ses: 9P2000 session information
 179  * @fid: fid pointing to file or directory to get info about
 180  * @fcall: pointer to response fcall
 181  *
 182  */
 183
 184 int
 185 v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **rcp)
 186 {
 187         int ret;
 188         struct v9fs_fcall *tc;
 189
 190         dprintk(DEBUG_9P, "fid %d\n", fid);
 191
 192         ret = -ENOMEM;
 193         tc = v9fs_create_tstat(fid);
 194         if (!IS_ERR(tc)) {
 195                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 196                 kfree(tc);
 197         } else
 198                 ret = PTR_ERR(tc);
 199
 200         return ret;
 201 }
 202
 203 /**
 204  * v9fs_t_wstat - write a file's meta-data
 205  * @v9ses: 9P2000 session information
 206  * @fid: fid pointing to file or directory to write info about
 207  * @stat: metadata
 208  * @fcall: pointer to response fcall
 209  *
 210  */
 211
 212 int
 213 v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
 214              struct v9fs_wstat *wstat, struct v9fs_fcall **rcp)
 215 {
 216         int ret;
 217         struct v9fs_fcall *tc;
 218
 219         dprintk(DEBUG_9P, "fid %d\n", fid);
 220
 221         tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
 222         if (!IS_ERR(tc)) {
 223                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 224                 kfree(tc);
 225         } else
 226                 ret = PTR_ERR(tc);
 227
 228         return ret;
 229 }
 230
 231 /**
 232  * v9fs_t_walk - walk a fid to a new file or directory
 233  * @v9ses: 9P2000 session information
 234  * @fid: fid to walk
 235  * @newfid: new fid (for clone operations)
 236  * @name: path to walk fid to
 237  * @fcall: pointer to response fcall
 238  *
 239  */
 240
 241 /* TODO: support multiple walk */
 242
 243 int
 244 v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
 245             char *name, struct v9fs_fcall **rcp)
 246 {
 247         int ret;
 248         struct v9fs_fcall *tc;
 249         int nwname;
 250
 251         dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
 252
 253         if (name)
 254                 nwname = 1;
 255         else
 256                 nwname = 0;
 257
 258         tc = v9fs_create_twalk(fid, newfid, nwname, &name);
 259         if (!IS_ERR(tc)) {
 260                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 261                 kfree(tc);
 262         } else
 263                 ret = PTR_ERR(tc);
 264
 265         return ret;
 266 }
 267
 268 /**
 269  * v9fs_t_open - open a file
 270  *
 271  * @v9ses - 9P2000 session information
 272  * @fid - fid to open
 273  * @mode - mode to open file (R, RW, etc)
 274  * @fcall - pointer to response fcall
 275  *
 276  */
 277
 278 int
 279 v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
 280             struct v9fs_fcall **rcp)
 281 {
 282         int ret;
 283         struct v9fs_fcall *tc;
 284
 285         dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
 286
 287         tc = v9fs_create_topen(fid, mode);
 288         if (!IS_ERR(tc)) {
 289                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 290                 kfree(tc);
 291         } else
 292                 ret = PTR_ERR(tc);
 293
 294         return ret;
 295 }
 296
 297 /**
 298  * v9fs_t_remove - remove a file or directory
 299  * @v9ses: 9P2000 session information
 300  * @fid: fid to remove
 301  * @fcall: pointer to response fcall
 302  *
 303  */
 304
 305 int
 306 v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
 307               struct v9fs_fcall **rcp)
 308 {
 309         int ret;
 310         struct v9fs_fcall *tc;
 311
 312         dprintk(DEBUG_9P, "fid %d\n", fid);
 313
 314         tc = v9fs_create_tremove(fid);
 315         if (!IS_ERR(tc)) {
 316                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 317                 kfree(tc);
 318         } else
 319                 ret = PTR_ERR(tc);
 320
 321         return ret;
 322 }
 323
 324 /**
 325  * v9fs_t_create - create a file or directory
 326  * @v9ses: 9P2000 session information
 327  * @fid: fid to create
 328  * @name: name of the file or directory to create
 329  * @perm: permissions to create with
 330  * @mode: mode to open file (R, RW, etc)
 331  * @fcall: pointer to response fcall
 332  *
 333  */
 334
 335 int
 336 v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
 337               u32 perm, u8 mode, struct v9fs_fcall **rcp)
 338 {
 339         int ret;
 340         struct v9fs_fcall *tc;
 341
 342         dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
 343                 fid, name, perm, mode);
 344
 345         tc = v9fs_create_tcreate(fid, name, perm, mode);
 346         if (!IS_ERR(tc)) {
 347                 ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
 348                 kfree(tc);
 349         } else
 350                 ret = PTR_ERR(tc);
 351
 352         return ret;
 353 }
 354
 355 /**
 356  * v9fs_t_read - read data
 357  * @v9ses: 9P2000 session information
 358  * @fid: fid to read from
 359  * @offset: offset to start read at
 360  * @count: how many bytes to read
 361  * @fcall: pointer to response fcall (with data)
 362  *
 363  */
 364
 365 int
 366 v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
 367             u32 count, struct v9fs_fcall **rcp)
 368 {
 369         int ret;
 370         struct v9fs_fcall *tc, *rc;
 371
 372         dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
 373                 (long long unsigned) offset, count);
 374
 375         tc = v9fs_create_tread(fid, offset, count);
 376         if (!IS_ERR(tc)) {
 377                 ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 378                 if (!ret)
 379                         ret = rc->params.rread.count;
 380                 if (rcp)
 381                         *rcp = rc;
 382                 else
 383                         kfree(rc);
 384
 385                 kfree(tc);
 386         } else
 387                 ret = PTR_ERR(tc);
 388
 389         return ret;
 390 }
 391
 392 /**
 393  * v9fs_t_write - write data
 394  * @v9ses: 9P2000 session information
 395  * @fid: fid to write to
 396  * @offset: offset to start write at
 397  * @count: how many bytes to write
 398  * @fcall: pointer to response fcall
 399  *
 400  */
 401
 402 int
 403 v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
 404         const char __user *data, struct v9fs_fcall **rcp)
 405 {
 406         int ret;
 407         struct v9fs_fcall *tc, *rc;
 408
 409         dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
 410                 (long long unsigned) offset, count);
 411
 412         tc = v9fs_create_twrite(fid, offset, count, data);
 413         if (!IS_ERR(tc)) {
 414                 ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
 415
 416                 if (!ret)
 417                         ret = rc->params.rwrite.count;
 418                 if (rcp)
 419                         *rcp = rc;
 420                 else
 421                         kfree(rc);
 422
 423                 kfree(tc);
 424         } else
 425                 ret = PTR_ERR(tc);
 426
 427         return ret;
 428 }
 429