fs/9p/fcall.c

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