Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1 | /* |
| 2 | * net/9p/clnt.c |
| 3 | * |
| 4 | * 9P Client |
| 5 | * |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 7 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
| 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 version 2 |
| 11 | * as published by the Free Software Foundation. |
| 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> |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 29 | #include <linux/poll.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 30 | #include <linux/idr.h> |
| 31 | #include <linux/mutex.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/uaccess.h> |
| 34 | #include <net/9p/9p.h> |
Eric Van Hensbergen | fb0466c | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 35 | #include <linux/parser.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 36 | #include <net/9p/client.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 37 | #include <net/9p/transport.h> |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 38 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 39 | /* |
| 40 | * Client Option Parsing (code inspired by NFS code) |
| 41 | * - a little lazy - parse all client options |
| 42 | */ |
| 43 | |
| 44 | enum { |
| 45 | Opt_msize, |
| 46 | Opt_trans, |
| 47 | Opt_legacy, |
| 48 | Opt_err, |
| 49 | }; |
| 50 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 51 | static const match_table_t tokens = { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 52 | {Opt_msize, "msize=%u"}, |
| 53 | {Opt_legacy, "noextend"}, |
| 54 | {Opt_trans, "trans=%s"}, |
| 55 | {Opt_err, NULL}, |
| 56 | }; |
| 57 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 58 | static int |
| 59 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc); |
| 60 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 61 | /** |
| 62 | * v9fs_parse_options - parse mount options into session structure |
| 63 | * @options: options string passed from mount |
| 64 | * @v9ses: existing v9fs session information |
| 65 | * |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 66 | * Return 0 upon success, -ERRNO upon failure |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 67 | */ |
| 68 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 69 | static int parse_opts(char *opts, struct p9_client *clnt) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 70 | { |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 71 | char *options; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 72 | char *p; |
| 73 | substring_t args[MAX_OPT_ARGS]; |
| 74 | int option; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 75 | int ret = 0; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 76 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 77 | clnt->dotu = 1; |
| 78 | clnt->msize = 8192; |
| 79 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 80 | if (!opts) |
| 81 | return 0; |
| 82 | |
| 83 | options = kstrdup(opts, GFP_KERNEL); |
| 84 | if (!options) { |
| 85 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 86 | "failed to allocate copy of option string\n"); |
| 87 | return -ENOMEM; |
| 88 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 89 | |
| 90 | while ((p = strsep(&options, ",")) != NULL) { |
| 91 | int token; |
| 92 | if (!*p) |
| 93 | continue; |
| 94 | token = match_token(p, tokens, args); |
| 95 | if (token < Opt_trans) { |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 96 | int r = match_int(&args[0], &option); |
| 97 | if (r < 0) { |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 98 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 99 | "integer field, but no integer?\n"); |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 100 | ret = r; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 101 | continue; |
| 102 | } |
| 103 | } |
| 104 | switch (token) { |
| 105 | case Opt_msize: |
| 106 | clnt->msize = option; |
| 107 | break; |
| 108 | case Opt_trans: |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 109 | clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 110 | break; |
| 111 | case Opt_legacy: |
| 112 | clnt->dotu = 0; |
| 113 | break; |
| 114 | default: |
| 115 | continue; |
| 116 | } |
| 117 | } |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 118 | |
| 119 | if (!clnt->trans_mod) |
| 120 | clnt->trans_mod = v9fs_get_default_trans(); |
| 121 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 122 | kfree(options); |
| 123 | return ret; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 124 | } |
| 125 | |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 126 | /** |
| 127 | * p9_tag_alloc - lookup/allocate a request by tag |
| 128 | * @c: client session to lookup tag within |
| 129 | * @tag: numeric id for transaction |
| 130 | * |
| 131 | * this is a simple array lookup, but will grow the |
| 132 | * request_slots as necessary to accomodate transaction |
| 133 | * ids which did not previously have a slot. |
| 134 | * |
| 135 | * this code relies on the client spinlock to manage locks, its |
| 136 | * possible we should switch to something else, but I'd rather |
| 137 | * stick with something low-overhead for the common case. |
| 138 | * |
| 139 | */ |
| 140 | |
| 141 | struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) |
| 142 | { |
| 143 | unsigned long flags; |
| 144 | int row, col; |
| 145 | |
| 146 | /* This looks up the original request by tag so we know which |
| 147 | * buffer to read the data into */ |
| 148 | tag++; |
| 149 | |
| 150 | if (tag >= c->max_tag) { |
| 151 | spin_lock_irqsave(&c->lock, flags); |
| 152 | /* check again since original check was outside of lock */ |
| 153 | while (tag >= c->max_tag) { |
| 154 | row = (tag / P9_ROW_MAXTAG); |
| 155 | c->reqs[row] = kcalloc(P9_ROW_MAXTAG, |
| 156 | sizeof(struct p9_req_t), GFP_ATOMIC); |
| 157 | |
| 158 | if (!c->reqs[row]) { |
| 159 | printk(KERN_ERR "Couldn't grow tag array\n"); |
| 160 | BUG(); |
| 161 | } |
| 162 | for (col = 0; col < P9_ROW_MAXTAG; col++) { |
| 163 | c->reqs[row][col].status = REQ_STATUS_IDLE; |
| 164 | c->reqs[row][col].flush_tag = P9_NOTAG; |
| 165 | c->reqs[row][col].wq = kmalloc( |
| 166 | sizeof(wait_queue_head_t), GFP_ATOMIC); |
| 167 | if (!c->reqs[row][col].wq) { |
| 168 | printk(KERN_ERR |
| 169 | "Couldn't grow tag array\n"); |
| 170 | BUG(); |
| 171 | } |
| 172 | init_waitqueue_head(c->reqs[row][col].wq); |
| 173 | } |
| 174 | c->max_tag += P9_ROW_MAXTAG; |
| 175 | } |
| 176 | spin_unlock_irqrestore(&c->lock, flags); |
| 177 | } |
| 178 | row = tag / P9_ROW_MAXTAG; |
| 179 | col = tag % P9_ROW_MAXTAG; |
| 180 | |
| 181 | c->reqs[row][col].status = REQ_STATUS_ALLOC; |
| 182 | c->reqs[row][col].flush_tag = P9_NOTAG; |
| 183 | |
| 184 | return &c->reqs[row][col]; |
| 185 | } |
| 186 | EXPORT_SYMBOL(p9_tag_alloc); |
| 187 | |
| 188 | /** |
| 189 | * p9_tag_lookup - lookup a request by tag |
| 190 | * @c: client session to lookup tag within |
| 191 | * @tag: numeric id for transaction |
| 192 | * |
| 193 | */ |
| 194 | |
| 195 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
| 196 | { |
| 197 | int row, col; |
| 198 | |
| 199 | /* This looks up the original request by tag so we know which |
| 200 | * buffer to read the data into */ |
| 201 | tag++; |
| 202 | |
| 203 | BUG_ON(tag >= c->max_tag); |
| 204 | |
| 205 | row = tag / P9_ROW_MAXTAG; |
| 206 | col = tag % P9_ROW_MAXTAG; |
| 207 | |
| 208 | return &c->reqs[row][col]; |
| 209 | } |
| 210 | EXPORT_SYMBOL(p9_tag_lookup); |
| 211 | |
| 212 | /** |
| 213 | * p9_tag_init - setup tags structure and contents |
| 214 | * @tags: tags structure from the client struct |
| 215 | * |
| 216 | * This initializes the tags structure for each client instance. |
| 217 | * |
| 218 | */ |
| 219 | |
| 220 | static int p9_tag_init(struct p9_client *c) |
| 221 | { |
| 222 | int err = 0; |
| 223 | |
| 224 | c->tagpool = p9_idpool_create(); |
| 225 | if (IS_ERR(c->tagpool)) { |
| 226 | err = PTR_ERR(c->tagpool); |
| 227 | c->tagpool = NULL; |
| 228 | goto error; |
| 229 | } |
| 230 | |
| 231 | p9_idpool_get(c->tagpool); /* reserve tag 0 */ |
| 232 | |
| 233 | c->max_tag = 0; |
| 234 | error: |
| 235 | return err; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * p9_tag_cleanup - cleans up tags structure and reclaims resources |
| 240 | * @tags: tags structure from the client struct |
| 241 | * |
| 242 | * This frees resources associated with the tags structure |
| 243 | * |
| 244 | */ |
| 245 | static void p9_tag_cleanup(struct p9_client *c) |
| 246 | { |
| 247 | int row, col; |
| 248 | |
| 249 | /* check to insure all requests are idle */ |
| 250 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { |
| 251 | for (col = 0; col < P9_ROW_MAXTAG; col++) { |
| 252 | if (c->reqs[row][col].status != REQ_STATUS_IDLE) { |
| 253 | P9_DPRINTK(P9_DEBUG_MUX, |
| 254 | "Attempting to cleanup non-free tag %d,%d\n", |
| 255 | row, col); |
| 256 | /* TODO: delay execution of cleanup */ |
| 257 | return; |
| 258 | } |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | if (c->tagpool) |
| 263 | p9_idpool_destroy(c->tagpool); |
| 264 | |
| 265 | /* free requests associated with tags */ |
| 266 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { |
| 267 | for (col = 0; col < P9_ROW_MAXTAG; col++) |
| 268 | kfree(c->reqs[row][col].wq); |
| 269 | kfree(c->reqs[row]); |
| 270 | } |
| 271 | c->max_tag = 0; |
| 272 | } |
| 273 | |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 274 | /** |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 275 | * p9_client_flush - flush (cancel) a request |
| 276 | * c: client state |
| 277 | * req: request to cancel |
| 278 | * |
| 279 | * This sents a flush for a particular requests and links |
| 280 | * the flush request to the original request. The current |
| 281 | * code only supports a single flush request although the protocol |
| 282 | * allows for multiple flush requests to be sent for a single request. |
| 283 | * |
| 284 | */ |
| 285 | |
| 286 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *req) |
| 287 | { |
| 288 | struct p9_fcall *tc, *rc = NULL; |
| 289 | int err; |
| 290 | |
| 291 | P9_DPRINTK(P9_DEBUG_9P, "client %p tag %d\n", c, req->tc->tag); |
| 292 | |
| 293 | tc = p9_create_tflush(req->tc->tag); |
| 294 | if (IS_ERR(tc)) |
| 295 | return PTR_ERR(tc); |
| 296 | |
| 297 | err = p9_client_rpc(c, tc, &rc); |
| 298 | |
| 299 | /* we don't free anything here because RPC isn't complete */ |
| 300 | |
| 301 | return err; |
| 302 | } |
| 303 | |
| 304 | /** |
Eric Van Hensbergen | 673d62cd | 2008-10-13 18:45:22 -0500 | [diff] [blame] | 305 | * p9_free_req - free a request and clean-up as necessary |
| 306 | * c: client state |
| 307 | * r: request to release |
| 308 | * |
| 309 | */ |
| 310 | |
| 311 | void p9_free_req(struct p9_client *c, struct p9_req_t *r) |
| 312 | { |
| 313 | r->flush_tag = P9_NOTAG; |
| 314 | r->status = REQ_STATUS_IDLE; |
| 315 | if (r->tc->tag != P9_NOTAG && p9_idpool_check(r->tc->tag, c->tagpool)) |
| 316 | p9_idpool_put(r->tc->tag, c->tagpool); |
| 317 | |
| 318 | /* if this was a flush request we have to free response fcall */ |
| 319 | if (r->tc->id == P9_TFLUSH) { |
| 320 | kfree(r->tc); |
| 321 | kfree(r->rc); |
| 322 | } |
| 323 | } |
| 324 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 325 | /** |
| 326 | * p9_client_cb - call back from transport to client |
| 327 | * c: client state |
| 328 | * req: request received |
| 329 | * |
| 330 | */ |
| 331 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req) |
| 332 | { |
| 333 | struct p9_req_t *other_req; |
| 334 | unsigned long flags; |
| 335 | |
| 336 | P9_DPRINTK(P9_DEBUG_MUX, ": %d\n", req->tc->tag); |
| 337 | |
| 338 | if (req->status == REQ_STATUS_ERROR) |
| 339 | wake_up(req->wq); |
| 340 | |
| 341 | if (req->tc->id == P9_TFLUSH) { /* flush receive path */ |
| 342 | P9_DPRINTK(P9_DEBUG_MUX, "flush: %d\n", req->tc->tag); |
| 343 | spin_lock_irqsave(&c->lock, flags); |
| 344 | other_req = p9_tag_lookup(c, req->tc->params.tflush.oldtag); |
| 345 | if (other_req->flush_tag != req->tc->tag) /* stale flush */ |
| 346 | spin_unlock_irqrestore(&c->lock, flags); |
| 347 | else { |
| 348 | BUG_ON(other_req->status != REQ_STATUS_FLSH); |
| 349 | other_req->status = REQ_STATUS_FLSHD; |
| 350 | spin_unlock_irqrestore(&c->lock, flags); |
| 351 | wake_up(other_req->wq); |
| 352 | } |
| 353 | p9_free_req(c, req); |
| 354 | } else { /* normal receive path */ |
| 355 | P9_DPRINTK(P9_DEBUG_MUX, "normal: %d\n", req->tc->tag); |
| 356 | spin_lock_irqsave(&c->lock, flags); |
| 357 | if (req->status != REQ_STATUS_FLSHD) |
| 358 | req->status = REQ_STATUS_RCVD; |
| 359 | req->flush_tag = P9_NOTAG; |
| 360 | spin_unlock_irqrestore(&c->lock, flags); |
| 361 | wake_up(req->wq); |
| 362 | P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); |
| 363 | } |
| 364 | } |
| 365 | EXPORT_SYMBOL(p9_client_cb); |
| 366 | |
| 367 | /** |
| 368 | * p9_client_rpc - issue a request and wait for a response |
| 369 | * @c: client session |
| 370 | * @tc: &p9_fcall request to transmit |
| 371 | * @rc: &p9_fcall to put reponse into |
| 372 | * |
| 373 | * Returns 0 on success, error code on failure |
| 374 | */ |
| 375 | |
| 376 | static int |
| 377 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc) |
| 378 | { |
| 379 | int tag, err, size; |
| 380 | char *rdata; |
| 381 | struct p9_req_t *req; |
| 382 | unsigned long flags; |
| 383 | int sigpending; |
| 384 | int flushed = 0; |
| 385 | |
| 386 | P9_DPRINTK(P9_DEBUG_9P, "client %p tc %p rc %p\n", c, tc, rc); |
| 387 | |
| 388 | if (c->status != Connected) |
| 389 | return -EIO; |
| 390 | |
| 391 | if (signal_pending(current)) { |
| 392 | sigpending = 1; |
| 393 | clear_thread_flag(TIF_SIGPENDING); |
| 394 | } else |
| 395 | sigpending = 0; |
| 396 | |
| 397 | tag = P9_NOTAG; |
| 398 | if (tc->id != P9_TVERSION) { |
| 399 | tag = p9_idpool_get(c->tagpool); |
| 400 | if (tag < 0) |
| 401 | return -ENOMEM; |
| 402 | } |
| 403 | |
| 404 | req = p9_tag_alloc(c, tag); |
| 405 | |
| 406 | /* if this is a flush request, backlink flush request now to |
| 407 | * avoid race conditions later. */ |
| 408 | if (tc->id == P9_TFLUSH) { |
| 409 | struct p9_req_t *other_req = |
| 410 | p9_tag_lookup(c, tc->params.tflush.oldtag); |
| 411 | if (other_req->status == REQ_STATUS_FLSH) |
| 412 | other_req->flush_tag = tag; |
| 413 | } |
| 414 | |
| 415 | p9_set_tag(tc, tag); |
| 416 | |
| 417 | /* |
| 418 | * if client passed in a pre-allocated response fcall struct |
| 419 | * then we just use that, otherwise we allocate one. |
| 420 | */ |
| 421 | |
| 422 | if (rc == NULL) |
| 423 | req->rc = NULL; |
| 424 | else |
| 425 | req->rc = *rc; |
| 426 | if (req->rc == NULL) { |
| 427 | req->rc = kmalloc(sizeof(struct p9_fcall) + c->msize, |
| 428 | GFP_KERNEL); |
| 429 | if (!req->rc) { |
| 430 | err = -ENOMEM; |
| 431 | p9_idpool_put(tag, c->tagpool); |
| 432 | p9_free_req(c, req); |
| 433 | goto reterr; |
| 434 | } |
| 435 | *rc = req->rc; |
| 436 | } |
| 437 | |
| 438 | rdata = (char *)req->rc+sizeof(struct p9_fcall); |
| 439 | |
| 440 | req->tc = tc; |
| 441 | P9_DPRINTK(P9_DEBUG_9P, "request: tc: %p rc: %p\n", req->tc, req->rc); |
| 442 | |
| 443 | err = c->trans_mod->request(c, req); |
| 444 | if (err < 0) { |
| 445 | c->status = Disconnected; |
| 446 | goto reterr; |
| 447 | } |
| 448 | |
| 449 | /* if it was a flush we just transmitted, return our tag */ |
| 450 | if (tc->id == P9_TFLUSH) |
| 451 | return 0; |
| 452 | again: |
| 453 | P9_DPRINTK(P9_DEBUG_9P, "wait %p tag: %d\n", req->wq, tag); |
| 454 | err = wait_event_interruptible(*req->wq, |
| 455 | req->status >= REQ_STATUS_RCVD); |
| 456 | P9_DPRINTK(P9_DEBUG_9P, "wait %p tag: %d returned %d (flushed=%d)\n", |
| 457 | req->wq, tag, err, flushed); |
| 458 | |
| 459 | if (req->status == REQ_STATUS_ERROR) { |
| 460 | P9_DPRINTK(P9_DEBUG_9P, "req_status error %d\n", req->t_err); |
| 461 | err = req->t_err; |
| 462 | } else if (err == -ERESTARTSYS && flushed) { |
| 463 | P9_DPRINTK(P9_DEBUG_9P, "flushed - going again\n"); |
| 464 | goto again; |
| 465 | } else if (req->status == REQ_STATUS_FLSHD) { |
| 466 | P9_DPRINTK(P9_DEBUG_9P, "flushed - erestartsys\n"); |
| 467 | err = -ERESTARTSYS; |
| 468 | } |
| 469 | |
| 470 | if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) { |
| 471 | P9_DPRINTK(P9_DEBUG_9P, "flushing\n"); |
| 472 | spin_lock_irqsave(&c->lock, flags); |
| 473 | if (req->status == REQ_STATUS_SENT) |
| 474 | req->status = REQ_STATUS_FLSH; |
| 475 | spin_unlock_irqrestore(&c->lock, flags); |
| 476 | sigpending = 1; |
| 477 | flushed = 1; |
| 478 | clear_thread_flag(TIF_SIGPENDING); |
| 479 | |
| 480 | if (c->trans_mod->cancel(c, req)) { |
| 481 | err = p9_client_flush(c, req); |
| 482 | if (err == 0) |
| 483 | goto again; |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | if (sigpending) { |
| 488 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 489 | recalc_sigpending(); |
| 490 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 491 | } |
| 492 | |
| 493 | if (err < 0) |
| 494 | goto reterr; |
| 495 | |
| 496 | size = le32_to_cpu(*(__le32 *) rdata); |
| 497 | |
| 498 | err = p9_deserialize_fcall(rdata, size, req->rc, c->dotu); |
| 499 | if (err < 0) { |
| 500 | P9_DPRINTK(P9_DEBUG_9P, |
| 501 | "9p debug: client rpc deserialize returned %d\n", err); |
| 502 | goto reterr; |
| 503 | } |
| 504 | |
| 505 | #ifdef CONFIG_NET_9P_DEBUG |
| 506 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { |
| 507 | char buf[150]; |
| 508 | |
| 509 | p9_printfcall(buf, sizeof(buf), req->rc, c->dotu); |
| 510 | printk(KERN_NOTICE ">>> %p %s\n", c, buf); |
| 511 | } |
| 512 | #endif |
| 513 | |
| 514 | if (req->rc->id == P9_RERROR) { |
| 515 | int ecode = req->rc->params.rerror.errno; |
| 516 | struct p9_str *ename = &req->rc->params.rerror.error; |
| 517 | |
| 518 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, |
| 519 | ename->str); |
| 520 | |
| 521 | if (c->dotu) |
| 522 | err = -ecode; |
| 523 | |
| 524 | if (!err) { |
| 525 | err = p9_errstr2errno(ename->str, ename->len); |
| 526 | |
| 527 | /* string match failed */ |
| 528 | if (!err) { |
| 529 | PRINT_FCALL_ERROR("unknown error", req->rc); |
| 530 | err = -ESERVERFAULT; |
| 531 | } |
| 532 | } |
| 533 | } else |
| 534 | err = 0; |
| 535 | |
| 536 | reterr: |
| 537 | p9_free_req(c, req); |
| 538 | |
| 539 | P9_DPRINTK(P9_DEBUG_9P, "returning %d\n", err); |
| 540 | return err; |
| 541 | } |
| 542 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 543 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
| 544 | { |
| 545 | int err; |
| 546 | struct p9_fid *fid; |
| 547 | |
| 548 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); |
| 549 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
| 550 | if (!fid) |
| 551 | return ERR_PTR(-ENOMEM); |
| 552 | |
| 553 | fid->fid = p9_idpool_get(clnt->fidpool); |
| 554 | if (fid->fid < 0) { |
| 555 | err = -ENOSPC; |
| 556 | goto error; |
| 557 | } |
| 558 | |
| 559 | memset(&fid->qid, 0, sizeof(struct p9_qid)); |
| 560 | fid->mode = -1; |
| 561 | fid->rdir_fpos = 0; |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 562 | fid->uid = current->fsuid; |
| 563 | fid->clnt = clnt; |
| 564 | fid->aux = NULL; |
| 565 | |
| 566 | spin_lock(&clnt->lock); |
| 567 | list_add(&fid->flist, &clnt->fidlist); |
| 568 | spin_unlock(&clnt->lock); |
| 569 | |
| 570 | return fid; |
| 571 | |
| 572 | error: |
| 573 | kfree(fid); |
| 574 | return ERR_PTR(err); |
| 575 | } |
| 576 | |
| 577 | static void p9_fid_destroy(struct p9_fid *fid) |
| 578 | { |
| 579 | struct p9_client *clnt; |
| 580 | |
| 581 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 582 | clnt = fid->clnt; |
| 583 | p9_idpool_put(fid->fid, clnt->fidpool); |
| 584 | spin_lock(&clnt->lock); |
| 585 | list_del(&fid->flist); |
| 586 | spin_unlock(&clnt->lock); |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 587 | kfree(fid); |
| 588 | } |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 589 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 590 | struct p9_client *p9_client_create(const char *dev_name, char *options) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 591 | { |
| 592 | int err, n; |
| 593 | struct p9_client *clnt; |
| 594 | struct p9_fcall *tc, *rc; |
| 595 | struct p9_str *version; |
| 596 | |
| 597 | err = 0; |
| 598 | tc = NULL; |
| 599 | rc = NULL; |
| 600 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
| 601 | if (!clnt) |
| 602 | return ERR_PTR(-ENOMEM); |
| 603 | |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 604 | clnt->trans_mod = NULL; |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 605 | clnt->trans = NULL; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 606 | spin_lock_init(&clnt->lock); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 607 | INIT_LIST_HEAD(&clnt->fidlist); |
| 608 | clnt->fidpool = p9_idpool_create(); |
Josef 'Jeff' Sipek | 728fc4e | 2008-03-07 11:40:33 -0600 | [diff] [blame] | 609 | if (IS_ERR(clnt->fidpool)) { |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 610 | err = PTR_ERR(clnt->fidpool); |
| 611 | clnt->fidpool = NULL; |
| 612 | goto error; |
| 613 | } |
| 614 | |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 615 | p9_tag_init(clnt); |
| 616 | |
Eric Van Hensbergen | bb8ffdf | 2008-03-07 10:53:53 -0600 | [diff] [blame] | 617 | err = parse_opts(options, clnt); |
| 618 | if (err < 0) |
| 619 | goto error; |
| 620 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 621 | if (clnt->trans_mod == NULL) { |
| 622 | err = -EPROTONOSUPPORT; |
| 623 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 624 | "No transport defined or default transport\n"); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 625 | goto error; |
| 626 | } |
| 627 | |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 628 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n", |
| 629 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); |
| 630 | |
| 631 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 632 | err = clnt->trans_mod->create(clnt, dev_name, options); |
| 633 | if (err) |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 634 | goto error; |
Eric Van Hensbergen | 8a0dc95 | 2008-02-06 19:25:03 -0600 | [diff] [blame] | 635 | |
| 636 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
| 637 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; |
| 638 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 639 | tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000"); |
| 640 | if (IS_ERR(tc)) { |
| 641 | err = PTR_ERR(tc); |
| 642 | tc = NULL; |
| 643 | goto error; |
| 644 | } |
| 645 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 646 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 647 | if (err) |
| 648 | goto error; |
| 649 | |
| 650 | version = &rc->params.rversion.version; |
| 651 | if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8)) |
| 652 | clnt->dotu = 1; |
| 653 | else if (version->len == 6 && !memcmp(version->str, "9P2000", 6)) |
| 654 | clnt->dotu = 0; |
| 655 | else { |
| 656 | err = -EREMOTEIO; |
| 657 | goto error; |
| 658 | } |
| 659 | |
| 660 | n = rc->params.rversion.msize; |
| 661 | if (n < clnt->msize) |
| 662 | clnt->msize = n; |
| 663 | |
| 664 | kfree(tc); |
| 665 | kfree(rc); |
| 666 | return clnt; |
| 667 | |
| 668 | error: |
| 669 | kfree(tc); |
| 670 | kfree(rc); |
| 671 | p9_client_destroy(clnt); |
| 672 | return ERR_PTR(err); |
| 673 | } |
| 674 | EXPORT_SYMBOL(p9_client_create); |
| 675 | |
| 676 | void p9_client_destroy(struct p9_client *clnt) |
| 677 | { |
| 678 | struct p9_fid *fid, *fidptr; |
| 679 | |
| 680 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 681 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 682 | if (clnt->trans_mod) |
| 683 | clnt->trans_mod->close(clnt); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 684 | |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 685 | v9fs_put_trans(clnt->trans_mod); |
| 686 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 687 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
| 688 | p9_fid_destroy(fid); |
| 689 | |
Eric Van Hensbergen | 0af8887 | 2007-07-13 16:47:58 -0500 | [diff] [blame] | 690 | if (clnt->fidpool) |
| 691 | p9_idpool_destroy(clnt->fidpool); |
| 692 | |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 693 | p9_tag_cleanup(clnt); |
| 694 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 695 | kfree(clnt); |
| 696 | } |
| 697 | EXPORT_SYMBOL(p9_client_destroy); |
| 698 | |
| 699 | void p9_client_disconnect(struct p9_client *clnt) |
| 700 | { |
| 701 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 702 | clnt->status = Disconnected; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 703 | } |
| 704 | EXPORT_SYMBOL(p9_client_disconnect); |
| 705 | |
| 706 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 707 | char *uname, u32 n_uname, char *aname) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 708 | { |
| 709 | int err; |
| 710 | struct p9_fcall *tc, *rc; |
| 711 | struct p9_fid *fid; |
| 712 | |
| 713 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n", |
| 714 | clnt, afid?afid->fid:-1, uname, aname); |
| 715 | err = 0; |
| 716 | tc = NULL; |
| 717 | rc = NULL; |
| 718 | |
| 719 | fid = p9_fid_create(clnt); |
| 720 | if (IS_ERR(fid)) { |
| 721 | err = PTR_ERR(fid); |
| 722 | fid = NULL; |
| 723 | goto error; |
| 724 | } |
| 725 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 726 | tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, |
| 727 | n_uname, clnt->dotu); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 728 | if (IS_ERR(tc)) { |
| 729 | err = PTR_ERR(tc); |
| 730 | tc = NULL; |
| 731 | goto error; |
| 732 | } |
| 733 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 734 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 735 | if (err) |
| 736 | goto error; |
| 737 | |
| 738 | memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid)); |
| 739 | kfree(tc); |
| 740 | kfree(rc); |
| 741 | return fid; |
| 742 | |
| 743 | error: |
| 744 | kfree(tc); |
| 745 | kfree(rc); |
| 746 | if (fid) |
| 747 | p9_fid_destroy(fid); |
| 748 | return ERR_PTR(err); |
| 749 | } |
| 750 | EXPORT_SYMBOL(p9_client_attach); |
| 751 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 752 | struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, |
| 753 | u32 n_uname, char *aname) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 754 | { |
| 755 | int err; |
| 756 | struct p9_fcall *tc, *rc; |
| 757 | struct p9_fid *fid; |
| 758 | |
| 759 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname, |
| 760 | aname); |
| 761 | err = 0; |
| 762 | tc = NULL; |
| 763 | rc = NULL; |
| 764 | |
| 765 | fid = p9_fid_create(clnt); |
| 766 | if (IS_ERR(fid)) { |
| 767 | err = PTR_ERR(fid); |
| 768 | fid = NULL; |
| 769 | goto error; |
| 770 | } |
| 771 | |
Latchesar Ionkov | ba17674 | 2007-10-17 14:31:07 -0500 | [diff] [blame] | 772 | tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 773 | if (IS_ERR(tc)) { |
| 774 | err = PTR_ERR(tc); |
| 775 | tc = NULL; |
| 776 | goto error; |
| 777 | } |
| 778 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 779 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 780 | if (err) |
| 781 | goto error; |
| 782 | |
| 783 | memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid)); |
| 784 | kfree(tc); |
| 785 | kfree(rc); |
| 786 | return fid; |
| 787 | |
| 788 | error: |
| 789 | kfree(tc); |
| 790 | kfree(rc); |
| 791 | if (fid) |
| 792 | p9_fid_destroy(fid); |
| 793 | return ERR_PTR(err); |
| 794 | } |
| 795 | EXPORT_SYMBOL(p9_client_auth); |
| 796 | |
| 797 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, |
| 798 | int clone) |
| 799 | { |
| 800 | int err; |
| 801 | struct p9_fcall *tc, *rc; |
| 802 | struct p9_client *clnt; |
| 803 | struct p9_fid *fid; |
| 804 | |
| 805 | P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n", |
| 806 | oldfid->fid, nwname, wnames?wnames[0]:NULL); |
| 807 | err = 0; |
| 808 | tc = NULL; |
| 809 | rc = NULL; |
| 810 | clnt = oldfid->clnt; |
| 811 | if (clone) { |
| 812 | fid = p9_fid_create(clnt); |
| 813 | if (IS_ERR(fid)) { |
| 814 | err = PTR_ERR(fid); |
| 815 | fid = NULL; |
| 816 | goto error; |
| 817 | } |
| 818 | |
| 819 | fid->uid = oldfid->uid; |
| 820 | } else |
| 821 | fid = oldfid; |
| 822 | |
| 823 | tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames); |
| 824 | if (IS_ERR(tc)) { |
| 825 | err = PTR_ERR(tc); |
| 826 | tc = NULL; |
| 827 | goto error; |
| 828 | } |
| 829 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 830 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 831 | if (err) { |
| 832 | if (rc && rc->id == P9_RWALK) |
| 833 | goto clunk_fid; |
| 834 | else |
| 835 | goto error; |
| 836 | } |
| 837 | |
| 838 | if (rc->params.rwalk.nwqid != nwname) { |
| 839 | err = -ENOENT; |
| 840 | goto clunk_fid; |
| 841 | } |
| 842 | |
| 843 | if (nwname) |
| 844 | memmove(&fid->qid, |
| 845 | &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1], |
| 846 | sizeof(struct p9_qid)); |
| 847 | else |
| 848 | fid->qid = oldfid->qid; |
| 849 | |
| 850 | kfree(tc); |
| 851 | kfree(rc); |
| 852 | return fid; |
| 853 | |
| 854 | clunk_fid: |
| 855 | kfree(tc); |
| 856 | kfree(rc); |
| 857 | rc = NULL; |
| 858 | tc = p9_create_tclunk(fid->fid); |
| 859 | if (IS_ERR(tc)) { |
| 860 | err = PTR_ERR(tc); |
| 861 | tc = NULL; |
| 862 | goto error; |
| 863 | } |
| 864 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 865 | p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 866 | |
| 867 | error: |
| 868 | kfree(tc); |
| 869 | kfree(rc); |
| 870 | if (fid && (fid != oldfid)) |
| 871 | p9_fid_destroy(fid); |
| 872 | |
| 873 | return ERR_PTR(err); |
| 874 | } |
| 875 | EXPORT_SYMBOL(p9_client_walk); |
| 876 | |
| 877 | int p9_client_open(struct p9_fid *fid, int mode) |
| 878 | { |
| 879 | int err; |
| 880 | struct p9_fcall *tc, *rc; |
| 881 | struct p9_client *clnt; |
| 882 | |
| 883 | P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode); |
| 884 | err = 0; |
| 885 | tc = NULL; |
| 886 | rc = NULL; |
| 887 | clnt = fid->clnt; |
| 888 | |
| 889 | if (fid->mode != -1) |
| 890 | return -EINVAL; |
| 891 | |
| 892 | tc = p9_create_topen(fid->fid, mode); |
| 893 | if (IS_ERR(tc)) { |
| 894 | err = PTR_ERR(tc); |
| 895 | tc = NULL; |
| 896 | goto done; |
| 897 | } |
| 898 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 899 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 900 | if (err) |
| 901 | goto done; |
| 902 | |
| 903 | fid->mode = mode; |
| 904 | fid->iounit = rc->params.ropen.iounit; |
| 905 | |
| 906 | done: |
| 907 | kfree(tc); |
| 908 | kfree(rc); |
| 909 | return err; |
| 910 | } |
| 911 | EXPORT_SYMBOL(p9_client_open); |
| 912 | |
| 913 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, |
| 914 | char *extension) |
| 915 | { |
| 916 | int err; |
| 917 | struct p9_fcall *tc, *rc; |
| 918 | struct p9_client *clnt; |
| 919 | |
| 920 | P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid, |
| 921 | name, perm, mode); |
| 922 | err = 0; |
| 923 | tc = NULL; |
| 924 | rc = NULL; |
| 925 | clnt = fid->clnt; |
| 926 | |
| 927 | if (fid->mode != -1) |
| 928 | return -EINVAL; |
| 929 | |
| 930 | tc = p9_create_tcreate(fid->fid, name, perm, mode, extension, |
| 931 | clnt->dotu); |
| 932 | if (IS_ERR(tc)) { |
| 933 | err = PTR_ERR(tc); |
| 934 | tc = NULL; |
| 935 | goto done; |
| 936 | } |
| 937 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 938 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 939 | if (err) |
| 940 | goto done; |
| 941 | |
| 942 | fid->mode = mode; |
| 943 | fid->iounit = rc->params.ropen.iounit; |
| 944 | |
| 945 | done: |
| 946 | kfree(tc); |
| 947 | kfree(rc); |
| 948 | return err; |
| 949 | } |
| 950 | EXPORT_SYMBOL(p9_client_fcreate); |
| 951 | |
| 952 | int p9_client_clunk(struct p9_fid *fid) |
| 953 | { |
| 954 | int err; |
| 955 | struct p9_fcall *tc, *rc; |
| 956 | struct p9_client *clnt; |
| 957 | |
| 958 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 959 | err = 0; |
| 960 | tc = NULL; |
| 961 | rc = NULL; |
| 962 | clnt = fid->clnt; |
| 963 | |
| 964 | tc = p9_create_tclunk(fid->fid); |
| 965 | if (IS_ERR(tc)) { |
| 966 | err = PTR_ERR(tc); |
| 967 | tc = NULL; |
| 968 | goto done; |
| 969 | } |
| 970 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 971 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 972 | if (err) |
| 973 | goto done; |
| 974 | |
| 975 | p9_fid_destroy(fid); |
| 976 | |
| 977 | done: |
| 978 | kfree(tc); |
| 979 | kfree(rc); |
| 980 | return err; |
| 981 | } |
| 982 | EXPORT_SYMBOL(p9_client_clunk); |
| 983 | |
| 984 | int p9_client_remove(struct p9_fid *fid) |
| 985 | { |
| 986 | int err; |
| 987 | struct p9_fcall *tc, *rc; |
| 988 | struct p9_client *clnt; |
| 989 | |
| 990 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 991 | err = 0; |
| 992 | tc = NULL; |
| 993 | rc = NULL; |
| 994 | clnt = fid->clnt; |
| 995 | |
| 996 | tc = p9_create_tremove(fid->fid); |
| 997 | if (IS_ERR(tc)) { |
| 998 | err = PTR_ERR(tc); |
| 999 | tc = NULL; |
| 1000 | goto done; |
| 1001 | } |
| 1002 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 1003 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1004 | if (err) |
| 1005 | goto done; |
| 1006 | |
| 1007 | p9_fid_destroy(fid); |
| 1008 | |
| 1009 | done: |
| 1010 | kfree(tc); |
| 1011 | kfree(rc); |
| 1012 | return err; |
| 1013 | } |
| 1014 | EXPORT_SYMBOL(p9_client_remove); |
| 1015 | |
Eric Van Hensbergen | 0fc9655 | 2008-10-13 20:36:17 -0500 | [diff] [blame] | 1016 | int |
| 1017 | p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, |
| 1018 | u32 count) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1019 | { |
| 1020 | int err, n, rsize, total; |
| 1021 | struct p9_fcall *tc, *rc; |
| 1022 | struct p9_client *clnt; |
| 1023 | |
| 1024 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid, |
| 1025 | (long long unsigned) offset, count); |
| 1026 | err = 0; |
| 1027 | tc = NULL; |
| 1028 | rc = NULL; |
| 1029 | clnt = fid->clnt; |
| 1030 | total = 0; |
| 1031 | |
| 1032 | rsize = fid->iounit; |
| 1033 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
| 1034 | rsize = clnt->msize - P9_IOHDRSZ; |
| 1035 | |
| 1036 | do { |
| 1037 | if (count < rsize) |
| 1038 | rsize = count; |
| 1039 | |
| 1040 | tc = p9_create_tread(fid->fid, offset, rsize); |
| 1041 | if (IS_ERR(tc)) { |
| 1042 | err = PTR_ERR(tc); |
| 1043 | tc = NULL; |
| 1044 | goto error; |
| 1045 | } |
| 1046 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 1047 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1048 | if (err) |
| 1049 | goto error; |
| 1050 | |
| 1051 | n = rc->params.rread.count; |
| 1052 | if (n > count) |
| 1053 | n = count; |
| 1054 | |
Eric Van Hensbergen | 0fc9655 | 2008-10-13 20:36:17 -0500 | [diff] [blame] | 1055 | if (data) { |
| 1056 | memmove(data, rc->params.rread.data, n); |
| 1057 | data += n; |
| 1058 | } |
| 1059 | |
| 1060 | if (udata) { |
| 1061 | err = copy_to_user(udata, rc->params.rread.data, n); |
| 1062 | if (err) { |
| 1063 | err = -EFAULT; |
| 1064 | goto error; |
| 1065 | } |
| 1066 | udata += n; |
| 1067 | } |
| 1068 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1069 | count -= n; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1070 | offset += n; |
| 1071 | total += n; |
| 1072 | kfree(tc); |
| 1073 | tc = NULL; |
| 1074 | kfree(rc); |
| 1075 | rc = NULL; |
| 1076 | } while (count > 0 && n == rsize); |
| 1077 | |
| 1078 | return total; |
| 1079 | |
| 1080 | error: |
| 1081 | kfree(tc); |
| 1082 | kfree(rc); |
| 1083 | return err; |
| 1084 | } |
| 1085 | EXPORT_SYMBOL(p9_client_read); |
| 1086 | |
Eric Van Hensbergen | 0fc9655 | 2008-10-13 20:36:17 -0500 | [diff] [blame] | 1087 | int |
| 1088 | p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, |
| 1089 | u64 offset, u32 count) |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1090 | { |
| 1091 | int err, n, rsize, total; |
| 1092 | struct p9_fcall *tc, *rc; |
| 1093 | struct p9_client *clnt; |
| 1094 | |
| 1095 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, |
| 1096 | (long long unsigned) offset, count); |
| 1097 | err = 0; |
| 1098 | tc = NULL; |
| 1099 | rc = NULL; |
| 1100 | clnt = fid->clnt; |
| 1101 | total = 0; |
| 1102 | |
| 1103 | rsize = fid->iounit; |
| 1104 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
| 1105 | rsize = clnt->msize - P9_IOHDRSZ; |
| 1106 | |
| 1107 | do { |
| 1108 | if (count < rsize) |
| 1109 | rsize = count; |
| 1110 | |
Eric Van Hensbergen | 0fc9655 | 2008-10-13 20:36:17 -0500 | [diff] [blame] | 1111 | if (data) |
| 1112 | tc = p9_create_twrite(fid->fid, offset, rsize, data); |
| 1113 | else |
| 1114 | tc = p9_create_twrite_u(fid->fid, offset, rsize, udata); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1115 | if (IS_ERR(tc)) { |
| 1116 | err = PTR_ERR(tc); |
| 1117 | tc = NULL; |
| 1118 | goto error; |
| 1119 | } |
| 1120 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 1121 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1122 | if (err) |
| 1123 | goto error; |
| 1124 | |
| 1125 | n = rc->params.rread.count; |
| 1126 | count -= n; |
Eric Van Hensbergen | 0fc9655 | 2008-10-13 20:36:17 -0500 | [diff] [blame] | 1127 | |
| 1128 | if (data) |
| 1129 | data += n; |
| 1130 | else |
| 1131 | udata += n; |
| 1132 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1133 | offset += n; |
| 1134 | total += n; |
| 1135 | kfree(tc); |
| 1136 | tc = NULL; |
| 1137 | kfree(rc); |
| 1138 | rc = NULL; |
| 1139 | } while (count > 0); |
| 1140 | |
| 1141 | return total; |
| 1142 | |
| 1143 | error: |
| 1144 | kfree(tc); |
| 1145 | kfree(rc); |
| 1146 | return err; |
| 1147 | } |
| 1148 | EXPORT_SYMBOL(p9_client_write); |
| 1149 | |
Eric Van Hensbergen | 5503ac5 | 2008-10-13 18:45:24 -0500 | [diff] [blame] | 1150 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) |
| 1151 | { |
| 1152 | int n; |
| 1153 | char *p; |
| 1154 | struct p9_stat *ret; |
| 1155 | |
| 1156 | n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len + |
| 1157 | st->muid.len; |
| 1158 | |
| 1159 | if (dotu) |
| 1160 | n += st->extension.len; |
| 1161 | |
| 1162 | ret = kmalloc(n, GFP_KERNEL); |
| 1163 | if (!ret) |
| 1164 | return ERR_PTR(-ENOMEM); |
| 1165 | |
| 1166 | memmove(ret, st, sizeof(struct p9_stat)); |
| 1167 | p = ((char *) ret) + sizeof(struct p9_stat); |
| 1168 | memmove(p, st->name.str, st->name.len); |
| 1169 | ret->name.str = p; |
| 1170 | p += st->name.len; |
| 1171 | memmove(p, st->uid.str, st->uid.len); |
| 1172 | ret->uid.str = p; |
| 1173 | p += st->uid.len; |
| 1174 | memmove(p, st->gid.str, st->gid.len); |
| 1175 | ret->gid.str = p; |
| 1176 | p += st->gid.len; |
| 1177 | memmove(p, st->muid.str, st->muid.len); |
| 1178 | ret->muid.str = p; |
| 1179 | p += st->muid.len; |
| 1180 | |
| 1181 | if (dotu) { |
| 1182 | memmove(p, st->extension.str, st->extension.len); |
| 1183 | ret->extension.str = p; |
| 1184 | p += st->extension.len; |
| 1185 | } |
| 1186 | |
| 1187 | return ret; |
| 1188 | } |
| 1189 | |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1190 | struct p9_stat *p9_client_stat(struct p9_fid *fid) |
| 1191 | { |
| 1192 | int err; |
| 1193 | struct p9_fcall *tc, *rc; |
| 1194 | struct p9_client *clnt; |
| 1195 | struct p9_stat *ret; |
| 1196 | |
| 1197 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 1198 | err = 0; |
| 1199 | tc = NULL; |
| 1200 | rc = NULL; |
| 1201 | ret = NULL; |
| 1202 | clnt = fid->clnt; |
| 1203 | |
| 1204 | tc = p9_create_tstat(fid->fid); |
| 1205 | if (IS_ERR(tc)) { |
| 1206 | err = PTR_ERR(tc); |
| 1207 | tc = NULL; |
| 1208 | goto error; |
| 1209 | } |
| 1210 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 1211 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1212 | if (err) |
| 1213 | goto error; |
| 1214 | |
| 1215 | ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu); |
| 1216 | if (IS_ERR(ret)) { |
| 1217 | err = PTR_ERR(ret); |
| 1218 | ret = NULL; |
| 1219 | goto error; |
| 1220 | } |
| 1221 | |
| 1222 | kfree(tc); |
| 1223 | kfree(rc); |
| 1224 | return ret; |
| 1225 | |
| 1226 | error: |
| 1227 | kfree(tc); |
| 1228 | kfree(rc); |
| 1229 | kfree(ret); |
| 1230 | return ERR_PTR(err); |
| 1231 | } |
| 1232 | EXPORT_SYMBOL(p9_client_stat); |
| 1233 | |
| 1234 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
| 1235 | { |
| 1236 | int err; |
| 1237 | struct p9_fcall *tc, *rc; |
| 1238 | struct p9_client *clnt; |
| 1239 | |
| 1240 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); |
| 1241 | err = 0; |
| 1242 | tc = NULL; |
| 1243 | rc = NULL; |
| 1244 | clnt = fid->clnt; |
| 1245 | |
| 1246 | tc = p9_create_twstat(fid->fid, wst, clnt->dotu); |
| 1247 | if (IS_ERR(tc)) { |
| 1248 | err = PTR_ERR(tc); |
| 1249 | tc = NULL; |
| 1250 | goto done; |
| 1251 | } |
| 1252 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 1253 | err = p9_client_rpc(clnt, tc, &rc); |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1254 | |
| 1255 | done: |
| 1256 | kfree(tc); |
| 1257 | kfree(rc); |
| 1258 | return err; |
| 1259 | } |
| 1260 | EXPORT_SYMBOL(p9_client_wstat); |