1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 9P Client 4 * 5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/poll.h> 15 #include <linux/idr.h> 16 #include <linux/mutex.h> 17 #include <linux/slab.h> 18 #include <linux/sched/signal.h> 19 #include <linux/uaccess.h> 20 #include <linux/uio.h> 21 #include <linux/netfs.h> 22 #include <net/9p/9p.h> 23 #include <linux/seq_file.h> 24 #include <linux/fs_context.h> 25 #include <net/9p/client.h> 26 #include <net/9p/transport.h> 27 #include "protocol.h" 28 29 #define CREATE_TRACE_POINTS 30 #include <trace/events/9p.h> 31 32 /* Client Option Parsing (code inspired by NFS code) 33 * - a little lazy - parse all client options 34 */ 35 36 inline int p9_is_proto_dotl(struct p9_client *clnt) 37 { 38 return clnt->proto_version == p9_proto_2000L; 39 } 40 EXPORT_SYMBOL(p9_is_proto_dotl); 41 42 inline int p9_is_proto_dotu(struct p9_client *clnt) 43 { 44 return clnt->proto_version == p9_proto_2000u; 45 } 46 EXPORT_SYMBOL(p9_is_proto_dotu); 47 48 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 49 { 50 if (clnt->msize != DEFAULT_MSIZE) 51 seq_printf(m, ",msize=%u", clnt->msize); 52 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 53 54 switch (clnt->proto_version) { 55 case p9_proto_legacy: 56 seq_puts(m, ",noextend"); 57 break; 58 case p9_proto_2000u: 59 seq_puts(m, ",version=9p2000.u"); 60 break; 61 case p9_proto_2000L: 62 /* Default */ 63 break; 64 } 65 66 if (clnt->trans_mod->show_options) 67 return clnt->trans_mod->show_options(m, clnt); 68 return 0; 69 } 70 EXPORT_SYMBOL(p9_show_client_options); 71 72 /* Some error codes are taken directly from the server replies, 73 * make sure they are valid. 74 */ 75 static int safe_errno(int err) 76 { 77 if (err > 0 || err < -MAX_ERRNO) { 78 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 79 return -EPROTO; 80 } 81 return err; 82 } 83 84 static int apply_client_options(struct p9_client *clnt, struct fs_context *fc) 85 { 86 struct v9fs_context *ctx = fc->fs_private; 87 88 clnt->msize = ctx->client_opts.msize; 89 clnt->trans_mod = ctx->client_opts.trans_mod; 90 ctx->client_opts.trans_mod = NULL; 91 clnt->proto_version = ctx->client_opts.proto_version; 92 93 return 0; 94 } 95 96 static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, 97 int alloc_msize) 98 { 99 if (likely(c->fcall_cache) && alloc_msize == c->msize) { 100 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); 101 fc->cache = c->fcall_cache; 102 if (!fc->sdata && c->trans_mod->supports_vmalloc) { 103 fc->sdata = kvmalloc(alloc_msize, GFP_NOFS); 104 fc->cache = NULL; 105 } 106 } else { 107 if (c->trans_mod->supports_vmalloc) 108 fc->sdata = kvmalloc(alloc_msize, GFP_NOFS); 109 else 110 fc->sdata = kmalloc(alloc_msize, GFP_NOFS); 111 fc->cache = NULL; 112 } 113 if (!fc->sdata) 114 return -ENOMEM; 115 fc->capacity = alloc_msize; 116 fc->id = 0; 117 fc->tag = P9_NOTAG; 118 return 0; 119 } 120 121 void p9_fcall_fini(struct p9_fcall *fc) 122 { 123 /* sdata can be NULL for interrupted requests in trans_rdma, 124 * and kmem_cache_free does not do NULL-check for us 125 */ 126 if (unlikely(!fc->sdata)) 127 return; 128 129 if (fc->cache) 130 kmem_cache_free(fc->cache, fc->sdata); 131 else 132 kvfree(fc->sdata); 133 } 134 EXPORT_SYMBOL(p9_fcall_fini); 135 136 static struct kmem_cache *p9_req_cache; 137 138 /** 139 * p9_tag_alloc - Allocate a new request. 140 * @c: Client session. 141 * @type: Transaction type. 142 * @t_size: Buffer size for holding this request 143 * (automatic calculation by format template if 0). 144 * @r_size: Buffer size for holding server's reply on this request 145 * (automatic calculation by format template if 0). 146 * @fmt: Format template for assembling 9p request message 147 * (see p9pdu_vwritef). 148 * @ap: Variable arguments to be fed to passed format template 149 * (see p9pdu_vwritef). 150 * 151 * Context: Process context. 152 * Return: Pointer to new request. 153 */ 154 static struct p9_req_t * 155 p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size, 156 const char *fmt, va_list ap) 157 { 158 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); 159 int alloc_tsize; 160 int alloc_rsize; 161 int tag; 162 va_list apc; 163 164 va_copy(apc, ap); 165 alloc_tsize = min_t(size_t, c->msize, 166 t_size ?: p9_msg_buf_size(c, type, fmt, apc)); 167 va_end(apc); 168 169 alloc_rsize = min_t(size_t, c->msize, 170 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap)); 171 172 if (!req) 173 return ERR_PTR(-ENOMEM); 174 175 if (p9_fcall_init(c, &req->tc, alloc_tsize)) 176 goto free_req; 177 if (p9_fcall_init(c, &req->rc, alloc_rsize)) 178 goto free; 179 180 p9pdu_reset(&req->tc); 181 p9pdu_reset(&req->rc); 182 req->t_err = 0; 183 req->status = REQ_STATUS_ALLOC; 184 /* refcount needs to be set to 0 before inserting into the idr 185 * so p9_tag_lookup does not accept a request that is not fully 186 * initialized. refcount_set to 2 below will mark request ready. 187 */ 188 refcount_set(&req->refcount, 0); 189 init_waitqueue_head(&req->wq); 190 INIT_LIST_HEAD(&req->req_list); 191 192 idr_preload(GFP_NOFS); 193 spin_lock_irq(&c->lock); 194 if (type == P9_TVERSION) 195 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, 196 GFP_NOWAIT); 197 else 198 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); 199 req->tc.tag = tag; 200 spin_unlock_irq(&c->lock); 201 idr_preload_end(); 202 if (tag < 0) 203 goto free; 204 205 /* Init ref to two because in the general case there is one ref 206 * that is put asynchronously by a writer thread, one ref 207 * temporarily given by p9_tag_lookup and put by p9_client_cb 208 * in the recv thread, and one ref put by p9_req_put in the 209 * main thread. The only exception is virtio that does not use 210 * p9_tag_lookup but does not have a writer thread either 211 * (the write happens synchronously in the request/zc_request 212 * callback), so p9_client_cb eats the second ref there 213 * as the pointer is duplicated directly by virtqueue_add_sgs() 214 */ 215 refcount_set(&req->refcount, 2); 216 217 return req; 218 219 free: 220 p9_fcall_fini(&req->tc); 221 p9_fcall_fini(&req->rc); 222 free_req: 223 kmem_cache_free(p9_req_cache, req); 224 return ERR_PTR(-ENOMEM); 225 } 226 227 /** 228 * p9_tag_lookup - Look up a request by tag. 229 * @c: Client session. 230 * @tag: Transaction ID. 231 * 232 * Context: Any context. 233 * Return: A request, or %NULL if there is no request with that tag. 234 */ 235 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 236 { 237 struct p9_req_t *req; 238 239 rcu_read_lock(); 240 again: 241 req = idr_find(&c->reqs, tag); 242 if (req) { 243 /* We have to be careful with the req found under rcu_read_lock 244 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the 245 * ref again without corrupting other data, then check again 246 * that the tag matches once we have the ref 247 */ 248 if (!p9_req_try_get(req)) 249 goto again; 250 if (req->tc.tag != tag) { 251 p9_req_put(c, req); 252 goto again; 253 } 254 } 255 rcu_read_unlock(); 256 257 return req; 258 } 259 EXPORT_SYMBOL(p9_tag_lookup); 260 261 /** 262 * p9_tag_remove - Remove a tag. 263 * @c: Client session. 264 * @r: Request of reference. 265 * 266 * Context: Any context. 267 */ 268 static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r) 269 { 270 unsigned long flags; 271 u16 tag = r->tc.tag; 272 273 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag); 274 spin_lock_irqsave(&c->lock, flags); 275 idr_remove(&c->reqs, tag); 276 spin_unlock_irqrestore(&c->lock, flags); 277 } 278 279 int p9_req_put(struct p9_client *c, struct p9_req_t *r) 280 { 281 if (refcount_dec_and_test(&r->refcount)) { 282 p9_tag_remove(c, r); 283 284 p9_fcall_fini(&r->tc); 285 p9_fcall_fini(&r->rc); 286 kmem_cache_free(p9_req_cache, r); 287 return 1; 288 } 289 return 0; 290 } 291 EXPORT_SYMBOL(p9_req_put); 292 293 /** 294 * p9_tag_cleanup - cleans up tags structure and reclaims resources 295 * @c: v9fs client struct 296 * 297 * This frees resources associated with the tags structure 298 * 299 */ 300 static void p9_tag_cleanup(struct p9_client *c) 301 { 302 struct p9_req_t *req; 303 int id; 304 305 rcu_read_lock(); 306 idr_for_each_entry(&c->reqs, req, id) { 307 pr_info("Tag %d still in use\n", id); 308 if (p9_req_put(c, req) == 0) 309 pr_warn("Packet with tag %d has still references", 310 req->tc.tag); 311 } 312 rcu_read_unlock(); 313 } 314 315 /** 316 * p9_client_cb - call back from transport to client 317 * @c: client state 318 * @req: request received 319 * @status: request status, one of REQ_STATUS_* 320 * 321 */ 322 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 323 { 324 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); 325 326 /* This barrier is needed to make sure any change made to req before 327 * the status change is visible to another thread 328 */ 329 smp_wmb(); 330 WRITE_ONCE(req->status, status); 331 332 wake_up(&req->wq); 333 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); 334 p9_req_put(c, req); 335 } 336 EXPORT_SYMBOL(p9_client_cb); 337 338 /** 339 * p9_parse_header - parse header arguments out of a packet 340 * @pdu: packet to parse 341 * @size: size of packet 342 * @type: type of request 343 * @tag: tag of packet 344 * @rewind: set if we need to rewind offset afterwards 345 */ 346 347 int 348 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, 349 int16_t *tag, int rewind) 350 { 351 s8 r_type; 352 s16 r_tag; 353 s32 r_size; 354 int offset = pdu->offset; 355 int err; 356 357 pdu->offset = 0; 358 359 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 360 if (err) 361 goto rewind_and_exit; 362 363 if (type) 364 *type = r_type; 365 if (tag) 366 *tag = r_tag; 367 if (size) 368 *size = r_size; 369 370 if (pdu->size != r_size || r_size < 7) { 371 err = -EINVAL; 372 goto rewind_and_exit; 373 } 374 375 pdu->id = r_type; 376 pdu->tag = r_tag; 377 378 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 379 pdu->size, pdu->id, pdu->tag); 380 381 rewind_and_exit: 382 if (rewind) 383 pdu->offset = offset; 384 return err; 385 } 386 EXPORT_SYMBOL(p9_parse_header); 387 388 /** 389 * p9_check_errors - check 9p packet for error return and process it 390 * @c: current client instance 391 * @req: request to parse and check for error conditions 392 * 393 * returns error code if one is discovered, otherwise returns 0 394 * 395 * this will have to be more complicated if we have multiple 396 * error packet types 397 */ 398 399 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 400 { 401 s8 type; 402 int err; 403 int ecode; 404 405 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); 406 if (req->rc.size > req->rc.capacity && !req->rc.zc) { 407 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n", 408 req->rc.size, req->rc.capacity, req->rc.id); 409 return -EIO; 410 } 411 /* dump the response from server 412 * This should be after check errors which poplulate pdu_fcall. 413 */ 414 trace_9p_protocol_dump(c, &req->rc); 415 if (err) { 416 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 417 return err; 418 } 419 if (type != P9_RERROR && type != P9_RLERROR) 420 return 0; 421 422 if (!p9_is_proto_dotl(c)) { 423 char *ename = NULL; 424 425 err = p9pdu_readf(&req->rc, c->proto_version, "s?d", 426 &ename, &ecode); 427 if (err) { 428 kfree(ename); 429 goto out_err; 430 } 431 432 if (p9_is_proto_dotu(c) && ecode < 512) 433 err = -ecode; 434 435 if (!err) { 436 err = p9_errstr2errno(ename, strlen(ename)); 437 438 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 439 -ecode, ename); 440 } 441 kfree(ename); 442 } else { 443 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); 444 if (err) 445 goto out_err; 446 err = -ecode; 447 448 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 449 } 450 451 return err; 452 453 out_err: 454 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 455 456 return err; 457 } 458 459 static struct p9_req_t * 460 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 461 462 /** 463 * p9_client_flush - flush (cancel) a request 464 * @c: client state 465 * @oldreq: request to cancel 466 * 467 * This sents a flush for a particular request and links 468 * the flush request to the original request. The current 469 * code only supports a single flush request although the protocol 470 * allows for multiple flush requests to be sent for a single request. 471 * 472 */ 473 474 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 475 { 476 struct p9_req_t *req; 477 s16 oldtag; 478 int err; 479 480 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); 481 if (err) 482 return err; 483 484 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 485 486 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 487 if (IS_ERR(req)) 488 return PTR_ERR(req); 489 490 /* if we haven't received a response for oldreq, 491 * remove it from the list 492 */ 493 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) { 494 if (c->trans_mod->cancelled) 495 c->trans_mod->cancelled(c, oldreq); 496 } 497 498 p9_req_put(c, req); 499 return 0; 500 } 501 502 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 503 int8_t type, uint t_size, uint r_size, 504 const char *fmt, va_list ap) 505 { 506 int err; 507 struct p9_req_t *req; 508 va_list apc; 509 510 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 511 512 /* we allow for any status other than disconnected */ 513 if (c->status == Disconnected) 514 return ERR_PTR(-EIO); 515 516 /* if status is begin_disconnected we allow only clunk request */ 517 if (c->status == BeginDisconnect && type != P9_TCLUNK) 518 return ERR_PTR(-EIO); 519 520 va_copy(apc, ap); 521 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc); 522 va_end(apc); 523 if (IS_ERR(req)) 524 return req; 525 526 /* marshall the data */ 527 p9pdu_prepare(&req->tc, req->tc.tag, type); 528 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); 529 if (err) 530 goto reterr; 531 p9pdu_finalize(c, &req->tc); 532 trace_9p_client_req(c, type, req->tc.tag); 533 return req; 534 reterr: 535 p9_req_put(c, req); 536 /* We have to put also the 2nd reference as it won't be used */ 537 p9_req_put(c, req); 538 return ERR_PTR(err); 539 } 540 541 /** 542 * p9_client_rpc - issue a request and wait for a response 543 * @c: client session 544 * @type: type of request 545 * @fmt: protocol format string (see protocol.c) 546 * 547 * Returns request structure (which client must free using p9_req_put) 548 */ 549 550 static struct p9_req_t * 551 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 552 { 553 va_list ap; 554 int sigpending, err; 555 unsigned long flags; 556 struct p9_req_t *req; 557 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to 558 * auto determine an appropriate (small) request/response size 559 * according to actual message data being sent. Currently RDMA 560 * transport is excluded from this response message size optimization, 561 * as it would not cope with it, due to its pooled response buffers 562 * (using an optimized request size for RDMA as well though). 563 */ 564 const uint tsize = 0; 565 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0; 566 567 va_start(ap, fmt); 568 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap); 569 va_end(ap); 570 if (IS_ERR(req)) 571 return req; 572 573 req->tc.zc = false; 574 req->rc.zc = false; 575 576 if (signal_pending(current)) { 577 sigpending = 1; 578 clear_thread_flag(TIF_SIGPENDING); 579 } else { 580 sigpending = 0; 581 } 582 583 err = c->trans_mod->request(c, req); 584 if (err < 0) { 585 /* write won't happen */ 586 p9_req_put(c, req); 587 if (err != -ERESTARTSYS && err != -EFAULT) 588 c->status = Disconnected; 589 goto recalc_sigpending; 590 } 591 again: 592 /* Wait for the response */ 593 err = wait_event_killable(req->wq, 594 READ_ONCE(req->status) >= REQ_STATUS_RCVD); 595 596 /* Make sure our req is coherent with regard to updates in other 597 * threads - echoes to wmb() in the callback 598 */ 599 smp_rmb(); 600 601 if (err == -ERESTARTSYS && c->status == Connected && 602 type == P9_TFLUSH) { 603 sigpending = 1; 604 clear_thread_flag(TIF_SIGPENDING); 605 goto again; 606 } 607 608 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 609 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 610 err = req->t_err; 611 } 612 if (err == -ERESTARTSYS && c->status == Connected) { 613 p9_debug(P9_DEBUG_MUX, "flushing\n"); 614 sigpending = 1; 615 clear_thread_flag(TIF_SIGPENDING); 616 617 if (c->trans_mod->cancel(c, req)) 618 p9_client_flush(c, req); 619 620 /* if we received the response anyway, don't signal error */ 621 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 622 err = 0; 623 } 624 recalc_sigpending: 625 if (sigpending) { 626 spin_lock_irqsave(¤t->sighand->siglock, flags); 627 recalc_sigpending(); 628 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 629 } 630 if (err < 0) 631 goto reterr; 632 633 err = p9_check_errors(c, req); 634 trace_9p_client_res(c, type, req->rc.tag, err); 635 if (!err) 636 return req; 637 reterr: 638 p9_req_put(c, req); 639 return ERR_PTR(safe_errno(err)); 640 } 641 642 /** 643 * p9_client_zc_rpc - issue a request and wait for a response 644 * @c: client session 645 * @type: type of request 646 * @uidata: destination for zero copy read 647 * @uodata: source for zero copy write 648 * @inlen: read buffer size 649 * @olen: write buffer size 650 * @in_hdrlen: reader header size, This is the size of response protocol data 651 * @fmt: protocol format string (see protocol.c) 652 * 653 * Returns request structure (which client must free using p9_req_put) 654 */ 655 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 656 struct iov_iter *uidata, 657 struct iov_iter *uodata, 658 int inlen, int olen, int in_hdrlen, 659 const char *fmt, ...) 660 { 661 va_list ap; 662 int sigpending, err; 663 unsigned long flags; 664 struct p9_req_t *req; 665 666 va_start(ap, fmt); 667 /* We allocate a inline protocol data of only 4k bytes. 668 * The actual content is passed in zero-copy fashion. 669 */ 670 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap); 671 va_end(ap); 672 if (IS_ERR(req)) 673 return req; 674 675 req->tc.zc = true; 676 req->rc.zc = true; 677 678 if (signal_pending(current)) { 679 sigpending = 1; 680 clear_thread_flag(TIF_SIGPENDING); 681 } else { 682 sigpending = 0; 683 } 684 685 err = c->trans_mod->zc_request(c, req, uidata, uodata, 686 inlen, olen, in_hdrlen); 687 if (err < 0) { 688 if (err == -EIO) 689 c->status = Disconnected; 690 if (err != -ERESTARTSYS) 691 goto recalc_sigpending; 692 } 693 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) { 694 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 695 err = req->t_err; 696 } 697 if (err == -ERESTARTSYS && c->status == Connected) { 698 p9_debug(P9_DEBUG_MUX, "flushing\n"); 699 sigpending = 1; 700 clear_thread_flag(TIF_SIGPENDING); 701 702 if (c->trans_mod->cancel(c, req)) 703 p9_client_flush(c, req); 704 705 /* if we received the response anyway, don't signal error */ 706 if (READ_ONCE(req->status) == REQ_STATUS_RCVD) 707 err = 0; 708 } 709 recalc_sigpending: 710 if (sigpending) { 711 spin_lock_irqsave(¤t->sighand->siglock, flags); 712 recalc_sigpending(); 713 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 714 } 715 if (err < 0) 716 goto reterr; 717 718 err = p9_check_errors(c, req); 719 trace_9p_client_res(c, type, req->rc.tag, err); 720 if (!err) 721 return req; 722 reterr: 723 p9_req_put(c, req); 724 return ERR_PTR(safe_errno(err)); 725 } 726 727 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 728 { 729 int ret; 730 struct p9_fid *fid; 731 732 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 733 fid = kzalloc(sizeof(*fid), GFP_KERNEL); 734 if (!fid) 735 return NULL; 736 737 fid->mode = -1; 738 fid->uid = current_fsuid(); 739 fid->clnt = clnt; 740 refcount_set(&fid->count, 1); 741 742 idr_preload(GFP_KERNEL); 743 spin_lock_irq(&clnt->lock); 744 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 745 GFP_NOWAIT); 746 spin_unlock_irq(&clnt->lock); 747 idr_preload_end(); 748 if (!ret) { 749 trace_9p_fid_ref(fid, P9_FID_REF_CREATE); 750 return fid; 751 } 752 753 kfree(fid); 754 return NULL; 755 } 756 757 static void p9_fid_destroy(struct p9_fid *fid) 758 { 759 struct p9_client *clnt; 760 unsigned long flags; 761 762 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 763 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY); 764 clnt = fid->clnt; 765 spin_lock_irqsave(&clnt->lock, flags); 766 idr_remove(&clnt->fids, fid->fid); 767 spin_unlock_irqrestore(&clnt->lock, flags); 768 kfree(fid->rdir); 769 kfree(fid); 770 } 771 772 /* We also need to export tracepoint symbols for tracepoint_enabled() */ 773 EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref); 774 775 void do_trace_9p_fid_get(struct p9_fid *fid) 776 { 777 trace_9p_fid_ref(fid, P9_FID_REF_GET); 778 } 779 EXPORT_SYMBOL(do_trace_9p_fid_get); 780 781 void do_trace_9p_fid_put(struct p9_fid *fid) 782 { 783 trace_9p_fid_ref(fid, P9_FID_REF_PUT); 784 } 785 EXPORT_SYMBOL(do_trace_9p_fid_put); 786 787 static int p9_client_version(struct p9_client *c) 788 { 789 int err; 790 struct p9_req_t *req; 791 char *version = NULL; 792 int msize; 793 794 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 795 c->msize, c->proto_version); 796 797 switch (c->proto_version) { 798 case p9_proto_2000L: 799 req = p9_client_rpc(c, P9_TVERSION, "ds", 800 c->msize, "9P2000.L"); 801 break; 802 case p9_proto_2000u: 803 req = p9_client_rpc(c, P9_TVERSION, "ds", 804 c->msize, "9P2000.u"); 805 break; 806 case p9_proto_legacy: 807 req = p9_client_rpc(c, P9_TVERSION, "ds", 808 c->msize, "9P2000"); 809 break; 810 default: 811 return -EINVAL; 812 } 813 814 if (IS_ERR(req)) 815 return PTR_ERR(req); 816 817 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); 818 if (err) { 819 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 820 trace_9p_protocol_dump(c, &req->rc); 821 goto error; 822 } 823 824 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 825 if (!strncmp(version, "9P2000.L", 8)) { 826 c->proto_version = p9_proto_2000L; 827 } else if (!strncmp(version, "9P2000.u", 8)) { 828 c->proto_version = p9_proto_2000u; 829 } else if (!strncmp(version, "9P2000", 6)) { 830 c->proto_version = p9_proto_legacy; 831 } else { 832 p9_debug(P9_DEBUG_ERROR, 833 "server returned an unknown version: %s\n", version); 834 err = -EREMOTEIO; 835 goto error; 836 } 837 838 if (msize < 4096) { 839 p9_debug(P9_DEBUG_ERROR, 840 "server returned a msize < 4096: %d\n", msize); 841 err = -EREMOTEIO; 842 goto error; 843 } 844 if (msize < c->msize) 845 c->msize = msize; 846 847 error: 848 kfree(version); 849 p9_req_put(c, req); 850 851 return err; 852 } 853 854 struct p9_client *p9_client_create(struct fs_context *fc) 855 { 856 int err; 857 static atomic_t seqno = ATOMIC_INIT(0); 858 struct p9_client *clnt; 859 char *client_id; 860 char *cache_name; 861 862 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL); 863 if (!clnt) 864 return ERR_PTR(-ENOMEM); 865 866 clnt->trans_mod = NULL; 867 clnt->trans = NULL; 868 clnt->fcall_cache = NULL; 869 870 client_id = utsname()->nodename; 871 memcpy(clnt->name, client_id, strlen(client_id) + 1); 872 873 spin_lock_init(&clnt->lock); 874 idr_init(&clnt->fids); 875 idr_init(&clnt->reqs); 876 877 err = apply_client_options(clnt, fc); 878 if (err) 879 goto free_client; 880 881 if (!clnt->trans_mod) 882 clnt->trans_mod = v9fs_get_default_trans(); 883 884 if (!clnt->trans_mod) { 885 err = -EPROTONOSUPPORT; 886 p9_debug(P9_DEBUG_ERROR, 887 "No transport defined or default transport\n"); 888 goto free_client; 889 } 890 891 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 892 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 893 894 err = clnt->trans_mod->create(clnt, fc); 895 if (err) 896 goto put_trans; 897 898 if (clnt->msize > clnt->trans_mod->maxsize) { 899 clnt->msize = clnt->trans_mod->maxsize; 900 pr_info("Limiting 'msize' to %d as this is the maximum " 901 "supported by transport %s\n", 902 clnt->msize, clnt->trans_mod->name 903 ); 904 } 905 906 if (clnt->msize < 4096) { 907 p9_debug(P9_DEBUG_ERROR, 908 "Please specify a msize of at least 4k\n"); 909 err = -EINVAL; 910 goto close_trans; 911 } 912 913 err = p9_client_version(clnt); 914 if (err) 915 goto close_trans; 916 917 cache_name = kasprintf(GFP_KERNEL, 918 "9p-fcall-cache-%u", atomic_inc_return(&seqno)); 919 if (!cache_name) { 920 err = -ENOMEM; 921 goto close_trans; 922 } 923 924 /* P9_HDRSZ + 4 is the smallest packet header we can have that is 925 * followed by data accessed from userspace by read 926 */ 927 clnt->fcall_cache = 928 kmem_cache_create_usercopy(cache_name, clnt->msize, 929 0, 0, P9_HDRSZ + 4, 930 clnt->msize - (P9_HDRSZ + 4), 931 NULL); 932 933 kfree(cache_name); 934 return clnt; 935 936 close_trans: 937 clnt->trans_mod->close(clnt); 938 put_trans: 939 v9fs_put_trans(clnt->trans_mod); 940 free_client: 941 kfree(clnt); 942 return ERR_PTR(err); 943 } 944 EXPORT_SYMBOL(p9_client_create); 945 946 void p9_client_destroy(struct p9_client *clnt) 947 { 948 struct p9_fid *fid; 949 int id; 950 951 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 952 953 if (clnt->trans_mod) 954 clnt->trans_mod->close(clnt); 955 956 v9fs_put_trans(clnt->trans_mod); 957 958 idr_for_each_entry(&clnt->fids, fid, id) { 959 pr_info("Found fid %d not clunked\n", fid->fid); 960 p9_fid_destroy(fid); 961 } 962 963 p9_tag_cleanup(clnt); 964 965 kmem_cache_destroy(clnt->fcall_cache); 966 kfree(clnt); 967 } 968 EXPORT_SYMBOL(p9_client_destroy); 969 970 void p9_client_disconnect(struct p9_client *clnt) 971 { 972 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 973 clnt->status = Disconnected; 974 } 975 EXPORT_SYMBOL(p9_client_disconnect); 976 977 void p9_client_begin_disconnect(struct p9_client *clnt) 978 { 979 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 980 clnt->status = BeginDisconnect; 981 } 982 EXPORT_SYMBOL(p9_client_begin_disconnect); 983 984 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 985 const char *uname, kuid_t n_uname, 986 const char *aname) 987 { 988 int err; 989 struct p9_req_t *req; 990 struct p9_fid *fid; 991 struct p9_qid qid; 992 993 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 994 afid ? afid->fid : -1, uname, aname); 995 fid = p9_fid_create(clnt); 996 if (!fid) { 997 err = -ENOMEM; 998 goto error; 999 } 1000 fid->uid = n_uname; 1001 1002 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1003 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1004 if (IS_ERR(req)) { 1005 err = PTR_ERR(req); 1006 goto error; 1007 } 1008 1009 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); 1010 if (err) { 1011 trace_9p_protocol_dump(clnt, &req->rc); 1012 p9_req_put(clnt, req); 1013 goto error; 1014 } 1015 1016 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1017 qid.type, qid.path, qid.version); 1018 1019 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1020 1021 p9_req_put(clnt, req); 1022 return fid; 1023 1024 error: 1025 if (fid) 1026 p9_fid_destroy(fid); 1027 return ERR_PTR(err); 1028 } 1029 EXPORT_SYMBOL(p9_client_attach); 1030 1031 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1032 const unsigned char * const *wnames, int clone) 1033 { 1034 int err; 1035 struct p9_client *clnt; 1036 struct p9_fid *fid; 1037 struct p9_qid *wqids; 1038 struct p9_req_t *req; 1039 u16 nwqids, count; 1040 1041 wqids = NULL; 1042 clnt = oldfid->clnt; 1043 if (clone) { 1044 fid = p9_fid_create(clnt); 1045 if (!fid) { 1046 err = -ENOMEM; 1047 goto error; 1048 } 1049 1050 fid->uid = oldfid->uid; 1051 } else { 1052 fid = oldfid; 1053 } 1054 1055 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1056 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1057 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1058 nwname, wnames); 1059 if (IS_ERR(req)) { 1060 err = PTR_ERR(req); 1061 goto error; 1062 } 1063 1064 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1065 if (err) { 1066 trace_9p_protocol_dump(clnt, &req->rc); 1067 p9_req_put(clnt, req); 1068 goto clunk_fid; 1069 } 1070 p9_req_put(clnt, req); 1071 1072 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1073 1074 if (nwqids != nwname) { 1075 err = -ENOENT; 1076 goto clunk_fid; 1077 } 1078 1079 for (count = 0; count < nwqids; count++) 1080 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1081 count, wqids[count].type, 1082 wqids[count].path, 1083 wqids[count].version); 1084 1085 if (nwname) 1086 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1087 else 1088 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); 1089 1090 kfree(wqids); 1091 return fid; 1092 1093 clunk_fid: 1094 kfree(wqids); 1095 p9_fid_put(fid); 1096 fid = NULL; 1097 1098 error: 1099 if (fid && fid != oldfid) 1100 p9_fid_destroy(fid); 1101 1102 return ERR_PTR(err); 1103 } 1104 EXPORT_SYMBOL(p9_client_walk); 1105 1106 int p9_client_open(struct p9_fid *fid, int mode) 1107 { 1108 int err; 1109 struct p9_client *clnt; 1110 struct p9_req_t *req; 1111 struct p9_qid qid; 1112 int iounit; 1113 1114 clnt = fid->clnt; 1115 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1116 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1117 1118 if (fid->mode != -1) 1119 return -EINVAL; 1120 1121 if (p9_is_proto_dotl(clnt)) 1122 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK); 1123 else 1124 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK); 1125 if (IS_ERR(req)) { 1126 err = PTR_ERR(req); 1127 goto error; 1128 } 1129 1130 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1131 if (err) { 1132 trace_9p_protocol_dump(clnt, &req->rc); 1133 goto free_and_error; 1134 } 1135 1136 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1137 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1138 qid.path, qid.version, iounit); 1139 1140 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1141 fid->mode = mode; 1142 fid->iounit = iounit; 1143 1144 free_and_error: 1145 p9_req_put(clnt, req); 1146 error: 1147 return err; 1148 } 1149 EXPORT_SYMBOL(p9_client_open); 1150 1151 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, 1152 u32 mode, kgid_t gid, struct p9_qid *qid) 1153 { 1154 int err; 1155 struct p9_client *clnt; 1156 struct p9_req_t *req; 1157 int iounit; 1158 1159 p9_debug(P9_DEBUG_9P, 1160 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1161 ofid->fid, name, flags, mode, 1162 from_kgid(&init_user_ns, gid)); 1163 clnt = ofid->clnt; 1164 1165 if (ofid->mode != -1) 1166 return -EINVAL; 1167 1168 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1169 mode & P9L_MODE_MASK, gid); 1170 if (IS_ERR(req)) { 1171 err = PTR_ERR(req); 1172 goto error; 1173 } 1174 1175 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); 1176 if (err) { 1177 trace_9p_protocol_dump(clnt, &req->rc); 1178 goto free_and_error; 1179 } 1180 1181 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1182 qid->type, qid->path, qid->version, iounit); 1183 1184 memmove(&ofid->qid, qid, sizeof(struct p9_qid)); 1185 ofid->mode = flags; 1186 ofid->iounit = iounit; 1187 1188 free_and_error: 1189 p9_req_put(clnt, req); 1190 error: 1191 return err; 1192 } 1193 EXPORT_SYMBOL(p9_client_create_dotl); 1194 1195 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1196 char *extension) 1197 { 1198 int err; 1199 struct p9_client *clnt; 1200 struct p9_req_t *req; 1201 struct p9_qid qid; 1202 int iounit; 1203 1204 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1205 fid->fid, name, perm, mode); 1206 clnt = fid->clnt; 1207 1208 if (fid->mode != -1) 1209 return -EINVAL; 1210 1211 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1212 mode & P9L_MODE_MASK, extension); 1213 if (IS_ERR(req)) { 1214 err = PTR_ERR(req); 1215 goto error; 1216 } 1217 1218 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1219 if (err) { 1220 trace_9p_protocol_dump(clnt, &req->rc); 1221 goto free_and_error; 1222 } 1223 1224 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1225 qid.type, qid.path, qid.version, iounit); 1226 1227 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1228 fid->mode = mode; 1229 fid->iounit = iounit; 1230 1231 free_and_error: 1232 p9_req_put(clnt, req); 1233 error: 1234 return err; 1235 } 1236 EXPORT_SYMBOL(p9_client_fcreate); 1237 1238 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1239 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1240 { 1241 int err; 1242 struct p9_client *clnt; 1243 struct p9_req_t *req; 1244 1245 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1246 dfid->fid, name, symtgt); 1247 clnt = dfid->clnt; 1248 1249 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1250 gid); 1251 if (IS_ERR(req)) { 1252 err = PTR_ERR(req); 1253 goto error; 1254 } 1255 1256 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 1257 if (err) { 1258 trace_9p_protocol_dump(clnt, &req->rc); 1259 goto free_and_error; 1260 } 1261 1262 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1263 qid->type, qid->path, qid->version); 1264 1265 free_and_error: 1266 p9_req_put(clnt, req); 1267 error: 1268 return err; 1269 } 1270 EXPORT_SYMBOL(p9_client_symlink); 1271 1272 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1273 { 1274 struct p9_client *clnt; 1275 struct p9_req_t *req; 1276 1277 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1278 dfid->fid, oldfid->fid, newname); 1279 clnt = dfid->clnt; 1280 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1281 newname); 1282 if (IS_ERR(req)) 1283 return PTR_ERR(req); 1284 1285 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1286 p9_req_put(clnt, req); 1287 return 0; 1288 } 1289 EXPORT_SYMBOL(p9_client_link); 1290 1291 int p9_client_fsync(struct p9_fid *fid, int datasync) 1292 { 1293 int err = 0; 1294 struct p9_client *clnt; 1295 struct p9_req_t *req; 1296 1297 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1298 fid->fid, datasync); 1299 clnt = fid->clnt; 1300 1301 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1302 if (IS_ERR(req)) { 1303 err = PTR_ERR(req); 1304 goto error; 1305 } 1306 1307 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1308 1309 p9_req_put(clnt, req); 1310 1311 error: 1312 return err; 1313 } 1314 EXPORT_SYMBOL(p9_client_fsync); 1315 1316 int p9_client_clunk(struct p9_fid *fid) 1317 { 1318 int err = 0; 1319 struct p9_client *clnt; 1320 struct p9_req_t *req; 1321 int retries = 0; 1322 1323 again: 1324 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", 1325 fid->fid, retries); 1326 clnt = fid->clnt; 1327 1328 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1329 if (IS_ERR(req)) { 1330 err = PTR_ERR(req); 1331 goto error; 1332 } 1333 1334 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1335 1336 p9_req_put(clnt, req); 1337 error: 1338 /* Fid is not valid even after a failed clunk 1339 * If interrupted, retry once then give up and 1340 * leak fid until umount. 1341 */ 1342 if (err == -ERESTARTSYS) { 1343 if (retries++ == 0) 1344 goto again; 1345 } else { 1346 p9_fid_destroy(fid); 1347 } 1348 return err; 1349 } 1350 EXPORT_SYMBOL(p9_client_clunk); 1351 1352 int p9_client_remove(struct p9_fid *fid) 1353 { 1354 int err = 0; 1355 struct p9_client *clnt; 1356 struct p9_req_t *req; 1357 1358 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1359 clnt = fid->clnt; 1360 1361 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1362 if (IS_ERR(req)) { 1363 err = PTR_ERR(req); 1364 goto error; 1365 } 1366 1367 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1368 1369 p9_req_put(clnt, req); 1370 error: 1371 if (err == -ERESTARTSYS) 1372 p9_fid_put(fid); 1373 else 1374 p9_fid_destroy(fid); 1375 return err; 1376 } 1377 EXPORT_SYMBOL(p9_client_remove); 1378 1379 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1380 { 1381 int err = 0; 1382 struct p9_req_t *req; 1383 struct p9_client *clnt; 1384 1385 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1386 dfid->fid, name, flags); 1387 1388 clnt = dfid->clnt; 1389 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1390 if (IS_ERR(req)) { 1391 err = PTR_ERR(req); 1392 goto error; 1393 } 1394 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1395 1396 p9_req_put(clnt, req); 1397 error: 1398 return err; 1399 } 1400 EXPORT_SYMBOL(p9_client_unlinkat); 1401 1402 int 1403 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1404 { 1405 int total = 0; 1406 *err = 0; 1407 1408 while (iov_iter_count(to)) { 1409 int count; 1410 1411 count = p9_client_read_once(fid, offset, to, err); 1412 if (!count || *err) 1413 break; 1414 offset += count; 1415 total += count; 1416 } 1417 return total; 1418 } 1419 EXPORT_SYMBOL(p9_client_read); 1420 1421 int 1422 p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, 1423 int *err) 1424 { 1425 struct p9_client *clnt = fid->clnt; 1426 struct p9_req_t *req; 1427 int count = iov_iter_count(to); 1428 u32 rsize, received; 1429 bool non_zc = false; 1430 char *dataptr; 1431 1432 *err = 0; 1433 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n", 1434 fid->fid, offset, iov_iter_count(to)); 1435 1436 rsize = fid->iounit; 1437 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1438 rsize = clnt->msize - P9_IOHDRSZ; 1439 1440 if (count < rsize) 1441 rsize = count; 1442 1443 /* Don't bother zerocopy for small IO (< 1024) */ 1444 if (clnt->trans_mod->zc_request && rsize > 1024) { 1445 /* response header len is 11 1446 * PDU Header(7) + IO Size (4) 1447 */ 1448 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1449 0, 11, "dqd", fid->fid, 1450 offset, rsize); 1451 } else { 1452 non_zc = true; 1453 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1454 rsize); 1455 } 1456 if (IS_ERR(req)) { 1457 *err = PTR_ERR(req); 1458 if (!non_zc) 1459 iov_iter_revert(to, count - iov_iter_count(to)); 1460 return 0; 1461 } 1462 1463 *err = p9pdu_readf(&req->rc, clnt->proto_version, 1464 "D", &received, &dataptr); 1465 if (*err) { 1466 if (!non_zc) 1467 iov_iter_revert(to, count - iov_iter_count(to)); 1468 trace_9p_protocol_dump(clnt, &req->rc); 1469 p9_req_put(clnt, req); 1470 return 0; 1471 } 1472 if (rsize < received) { 1473 pr_err("bogus RREAD count (%u > %u)\n", received, rsize); 1474 *err = -EIO; 1475 p9_req_put(clnt, req); 1476 return 0; 1477 } 1478 1479 p9_debug(P9_DEBUG_9P, "<<< RREAD count %u\n", received); 1480 1481 if (non_zc) { 1482 int n = copy_to_iter(dataptr, received, to); 1483 1484 if (n != received) { 1485 *err = -EFAULT; 1486 p9_req_put(clnt, req); 1487 return n; 1488 } 1489 } else { 1490 iov_iter_revert(to, count - received - iov_iter_count(to)); 1491 } 1492 p9_req_put(clnt, req); 1493 return received; 1494 } 1495 EXPORT_SYMBOL(p9_client_read_once); 1496 1497 int 1498 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1499 { 1500 struct p9_client *clnt = fid->clnt; 1501 struct p9_req_t *req; 1502 int total = 0; 1503 *err = 0; 1504 1505 while (iov_iter_count(from)) { 1506 size_t count = iov_iter_count(from); 1507 u32 rsize = fid->iounit; 1508 u32 written; 1509 1510 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) 1511 rsize = clnt->msize - P9_IOHDRSZ; 1512 1513 if (count < rsize) 1514 rsize = count; 1515 1516 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %u (/%zu)\n", 1517 fid->fid, offset, rsize, count); 1518 1519 /* Don't bother zerocopy for small IO (< 1024) */ 1520 if (clnt->trans_mod->zc_request && rsize > 1024) { 1521 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1522 rsize, P9_ZC_HDR_SZ, "dqd", 1523 fid->fid, offset, rsize); 1524 } else { 1525 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1526 offset, rsize, from); 1527 } 1528 if (IS_ERR(req)) { 1529 iov_iter_revert(from, count - iov_iter_count(from)); 1530 *err = PTR_ERR(req); 1531 break; 1532 } 1533 1534 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1535 if (*err) { 1536 iov_iter_revert(from, count - iov_iter_count(from)); 1537 trace_9p_protocol_dump(clnt, &req->rc); 1538 p9_req_put(clnt, req); 1539 break; 1540 } 1541 if (rsize < written) { 1542 pr_err("bogus RWRITE count (%u > %u)\n", written, rsize); 1543 *err = -EIO; 1544 iov_iter_revert(from, count - iov_iter_count(from)); 1545 p9_req_put(clnt, req); 1546 break; 1547 } 1548 1549 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %u\n", written); 1550 1551 p9_req_put(clnt, req); 1552 iov_iter_revert(from, count - written - iov_iter_count(from)); 1553 total += written; 1554 offset += written; 1555 } 1556 return total; 1557 } 1558 EXPORT_SYMBOL(p9_client_write); 1559 1560 void 1561 p9_client_write_subreq(struct netfs_io_subrequest *subreq) 1562 { 1563 struct netfs_io_request *wreq = subreq->rreq; 1564 struct p9_fid *fid = wreq->netfs_priv; 1565 struct p9_client *clnt = fid->clnt; 1566 struct p9_req_t *req; 1567 unsigned long long start = subreq->start + subreq->transferred; 1568 int written, len = subreq->len - subreq->transferred; 1569 int err; 1570 1571 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n", 1572 fid->fid, start, len); 1573 1574 /* Don't bother zerocopy for small IO (< 1024) */ 1575 if (clnt->trans_mod->zc_request && len > 1024) { 1576 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter, 1577 0, wreq->len, P9_ZC_HDR_SZ, "dqd", 1578 fid->fid, start, len); 1579 } else { 1580 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1581 start, len, &subreq->io_iter); 1582 } 1583 if (IS_ERR(req)) { 1584 netfs_write_subrequest_terminated(subreq, PTR_ERR(req)); 1585 return; 1586 } 1587 1588 err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written); 1589 if (err) { 1590 trace_9p_protocol_dump(clnt, &req->rc); 1591 p9_req_put(clnt, req); 1592 netfs_write_subrequest_terminated(subreq, err); 1593 return; 1594 } 1595 1596 if (written > len) { 1597 pr_err("bogus RWRITE count (%d > %u)\n", written, len); 1598 written = -EIO; 1599 } 1600 1601 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len); 1602 1603 p9_req_put(clnt, req); 1604 netfs_write_subrequest_terminated(subreq, written); 1605 } 1606 EXPORT_SYMBOL(p9_client_write_subreq); 1607 1608 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1609 { 1610 int err; 1611 struct p9_client *clnt; 1612 struct p9_wstat *ret; 1613 struct p9_req_t *req; 1614 u16 ignored; 1615 1616 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1617 1618 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1619 if (!ret) 1620 return ERR_PTR(-ENOMEM); 1621 1622 clnt = fid->clnt; 1623 1624 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1625 if (IS_ERR(req)) { 1626 err = PTR_ERR(req); 1627 goto error; 1628 } 1629 1630 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); 1631 if (err) { 1632 trace_9p_protocol_dump(clnt, &req->rc); 1633 p9_req_put(clnt, req); 1634 goto error; 1635 } 1636 1637 p9_debug(P9_DEBUG_9P, 1638 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1639 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1640 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1641 "<<< uid=%d gid=%d n_muid=%d\n", 1642 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path, 1643 ret->qid.version, ret->mode, 1644 ret->atime, ret->mtime, ret->length, 1645 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1646 from_kuid(&init_user_ns, ret->n_uid), 1647 from_kgid(&init_user_ns, ret->n_gid), 1648 from_kuid(&init_user_ns, ret->n_muid)); 1649 1650 p9_req_put(clnt, req); 1651 return ret; 1652 1653 error: 1654 kfree(ret); 1655 return ERR_PTR(err); 1656 } 1657 EXPORT_SYMBOL(p9_client_stat); 1658 1659 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1660 u64 request_mask) 1661 { 1662 int err; 1663 struct p9_client *clnt; 1664 struct p9_stat_dotl *ret; 1665 struct p9_req_t *req; 1666 1667 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1668 fid->fid, request_mask); 1669 1670 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 1671 if (!ret) 1672 return ERR_PTR(-ENOMEM); 1673 1674 clnt = fid->clnt; 1675 1676 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1677 if (IS_ERR(req)) { 1678 err = PTR_ERR(req); 1679 goto error; 1680 } 1681 1682 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); 1683 if (err) { 1684 trace_9p_protocol_dump(clnt, &req->rc); 1685 p9_req_put(clnt, req); 1686 goto error; 1687 } 1688 1689 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n" 1690 "<<< qid=%x.%llx.%x\n" 1691 "<<< st_mode=%8.8x st_nlink=%llu\n" 1692 "<<< st_uid=%d st_gid=%d\n" 1693 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1694 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1695 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1696 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1697 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1698 "<<< st_gen=%lld st_data_version=%lld\n", 1699 ret->st_result_mask, 1700 ret->qid.type, ret->qid.path, ret->qid.version, 1701 ret->st_mode, ret->st_nlink, 1702 from_kuid(&init_user_ns, ret->st_uid), 1703 from_kgid(&init_user_ns, ret->st_gid), 1704 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks, 1705 ret->st_atime_sec, ret->st_atime_nsec, 1706 ret->st_mtime_sec, ret->st_mtime_nsec, 1707 ret->st_ctime_sec, ret->st_ctime_nsec, 1708 ret->st_btime_sec, ret->st_btime_nsec, 1709 ret->st_gen, ret->st_data_version); 1710 1711 p9_req_put(clnt, req); 1712 return ret; 1713 1714 error: 1715 kfree(ret); 1716 return ERR_PTR(err); 1717 } 1718 EXPORT_SYMBOL(p9_client_getattr_dotl); 1719 1720 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1721 { 1722 int ret; 1723 1724 /* NOTE: size shouldn't include its own length */ 1725 /* size[2] type[2] dev[4] qid[13] */ 1726 /* mode[4] atime[4] mtime[4] length[8]*/ 1727 /* name[s] uid[s] gid[s] muid[s] */ 1728 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2; 1729 1730 if (wst->name) 1731 ret += strlen(wst->name); 1732 if (wst->uid) 1733 ret += strlen(wst->uid); 1734 if (wst->gid) 1735 ret += strlen(wst->gid); 1736 if (wst->muid) 1737 ret += strlen(wst->muid); 1738 1739 if (proto_version == p9_proto_2000u || 1740 proto_version == p9_proto_2000L) { 1741 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1742 ret += 2 + 4 + 4 + 4; 1743 if (wst->extension) 1744 ret += strlen(wst->extension); 1745 } 1746 1747 return ret; 1748 } 1749 1750 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1751 { 1752 int err = 0; 1753 struct p9_req_t *req; 1754 struct p9_client *clnt; 1755 1756 clnt = fid->clnt; 1757 wst->size = p9_client_statsize(wst, clnt->proto_version); 1758 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", 1759 fid->fid); 1760 p9_debug(P9_DEBUG_9P, 1761 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1762 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1763 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1764 " uid=%d gid=%d n_muid=%d\n", 1765 wst->size, wst->type, wst->dev, wst->qid.type, 1766 wst->qid.path, wst->qid.version, 1767 wst->mode, wst->atime, wst->mtime, wst->length, 1768 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1769 from_kuid(&init_user_ns, wst->n_uid), 1770 from_kgid(&init_user_ns, wst->n_gid), 1771 from_kuid(&init_user_ns, wst->n_muid)); 1772 1773 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", 1774 fid->fid, wst->size + 2, wst); 1775 if (IS_ERR(req)) { 1776 err = PTR_ERR(req); 1777 goto error; 1778 } 1779 1780 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1781 1782 p9_req_put(clnt, req); 1783 error: 1784 return err; 1785 } 1786 EXPORT_SYMBOL(p9_client_wstat); 1787 1788 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1789 { 1790 int err = 0; 1791 struct p9_req_t *req; 1792 struct p9_client *clnt; 1793 1794 clnt = fid->clnt; 1795 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1796 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n", 1797 p9attr->valid, p9attr->mode, 1798 from_kuid(&init_user_ns, p9attr->uid), 1799 from_kgid(&init_user_ns, p9attr->gid), 1800 p9attr->size); 1801 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n", 1802 p9attr->atime_sec, p9attr->atime_nsec); 1803 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n", 1804 p9attr->mtime_sec, p9attr->mtime_nsec); 1805 1806 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1807 1808 if (IS_ERR(req)) { 1809 err = PTR_ERR(req); 1810 goto error; 1811 } 1812 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1813 p9_req_put(clnt, req); 1814 error: 1815 return err; 1816 } 1817 EXPORT_SYMBOL(p9_client_setattr); 1818 1819 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1820 { 1821 int err; 1822 struct p9_req_t *req; 1823 struct p9_client *clnt; 1824 1825 clnt = fid->clnt; 1826 1827 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1828 1829 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1830 if (IS_ERR(req)) { 1831 err = PTR_ERR(req); 1832 goto error; 1833 } 1834 1835 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1836 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1837 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1838 if (err) { 1839 trace_9p_protocol_dump(clnt, &req->rc); 1840 p9_req_put(clnt, req); 1841 goto error; 1842 } 1843 1844 p9_debug(P9_DEBUG_9P, 1845 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n", 1846 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree, 1847 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen); 1848 1849 p9_req_put(clnt, req); 1850 error: 1851 return err; 1852 } 1853 EXPORT_SYMBOL(p9_client_statfs); 1854 1855 int p9_client_rename(struct p9_fid *fid, 1856 struct p9_fid *newdirfid, const char *name) 1857 { 1858 int err = 0; 1859 struct p9_req_t *req; 1860 struct p9_client *clnt; 1861 1862 clnt = fid->clnt; 1863 1864 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1865 fid->fid, newdirfid->fid, name); 1866 1867 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1868 newdirfid->fid, name); 1869 if (IS_ERR(req)) { 1870 err = PTR_ERR(req); 1871 goto error; 1872 } 1873 1874 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1875 1876 p9_req_put(clnt, req); 1877 error: 1878 return err; 1879 } 1880 EXPORT_SYMBOL(p9_client_rename); 1881 1882 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1883 struct p9_fid *newdirfid, const char *new_name) 1884 { 1885 int err = 0; 1886 struct p9_req_t *req; 1887 struct p9_client *clnt; 1888 1889 clnt = olddirfid->clnt; 1890 1891 p9_debug(P9_DEBUG_9P, 1892 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n", 1893 olddirfid->fid, old_name, newdirfid->fid, new_name); 1894 1895 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1896 old_name, newdirfid->fid, new_name); 1897 if (IS_ERR(req)) { 1898 err = PTR_ERR(req); 1899 goto error; 1900 } 1901 1902 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1903 newdirfid->fid, new_name); 1904 1905 p9_req_put(clnt, req); 1906 error: 1907 return err; 1908 } 1909 EXPORT_SYMBOL(p9_client_renameat); 1910 1911 /* An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1912 */ 1913 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1914 const char *attr_name, u64 *attr_size) 1915 { 1916 int err; 1917 struct p9_req_t *req; 1918 struct p9_client *clnt; 1919 struct p9_fid *attr_fid; 1920 1921 clnt = file_fid->clnt; 1922 attr_fid = p9_fid_create(clnt); 1923 if (!attr_fid) { 1924 err = -ENOMEM; 1925 goto error; 1926 } 1927 p9_debug(P9_DEBUG_9P, 1928 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n", 1929 file_fid->fid, attr_fid->fid, attr_name); 1930 1931 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1932 file_fid->fid, attr_fid->fid, attr_name); 1933 if (IS_ERR(req)) { 1934 err = PTR_ERR(req); 1935 goto error; 1936 } 1937 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); 1938 if (err) { 1939 trace_9p_protocol_dump(clnt, &req->rc); 1940 p9_req_put(clnt, req); 1941 goto clunk_fid; 1942 } 1943 p9_req_put(clnt, req); 1944 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1945 attr_fid->fid, *attr_size); 1946 return attr_fid; 1947 clunk_fid: 1948 p9_fid_put(attr_fid); 1949 attr_fid = NULL; 1950 error: 1951 if (attr_fid && attr_fid != file_fid) 1952 p9_fid_destroy(attr_fid); 1953 1954 return ERR_PTR(err); 1955 } 1956 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1957 1958 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1959 u64 attr_size, int flags) 1960 { 1961 int err = 0; 1962 struct p9_req_t *req; 1963 struct p9_client *clnt; 1964 1965 p9_debug(P9_DEBUG_9P, 1966 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n", 1967 fid->fid, name, attr_size, flags); 1968 clnt = fid->clnt; 1969 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1970 fid->fid, name, attr_size, flags); 1971 if (IS_ERR(req)) { 1972 err = PTR_ERR(req); 1973 goto error; 1974 } 1975 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1976 p9_req_put(clnt, req); 1977 error: 1978 return err; 1979 } 1980 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1981 1982 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1983 { 1984 int err, non_zc = 0; 1985 u32 rsize; 1986 struct p9_client *clnt; 1987 struct p9_req_t *req; 1988 char *dataptr; 1989 struct kvec kv = {.iov_base = data, .iov_len = count}; 1990 struct iov_iter to; 1991 1992 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count); 1993 1994 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %u\n", 1995 fid->fid, offset, count); 1996 1997 clnt = fid->clnt; 1998 1999 rsize = fid->iounit; 2000 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ) 2001 rsize = clnt->msize - P9_READDIRHDRSZ; 2002 2003 if (count < rsize) 2004 rsize = count; 2005 2006 /* Don't bother zerocopy for small IO (< 1024) */ 2007 if (clnt->trans_mod->zc_request && rsize > 1024) { 2008 /* response header len is 11 2009 * PDU Header(7) + IO Size (4) 2010 */ 2011 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2012 11, "dqd", fid->fid, offset, rsize); 2013 } else { 2014 non_zc = 1; 2015 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2016 offset, rsize); 2017 } 2018 if (IS_ERR(req)) { 2019 err = PTR_ERR(req); 2020 goto error; 2021 } 2022 2023 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); 2024 if (err) { 2025 trace_9p_protocol_dump(clnt, &req->rc); 2026 goto free_and_error; 2027 } 2028 if (rsize < count) { 2029 pr_err("bogus RREADDIR count (%u > %u)\n", count, rsize); 2030 err = -EIO; 2031 goto free_and_error; 2032 } 2033 2034 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %u\n", count); 2035 2036 if (non_zc) 2037 memmove(data, dataptr, count); 2038 2039 p9_req_put(clnt, req); 2040 return count; 2041 2042 free_and_error: 2043 p9_req_put(clnt, req); 2044 error: 2045 return err; 2046 } 2047 EXPORT_SYMBOL(p9_client_readdir); 2048 2049 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2050 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2051 { 2052 int err; 2053 struct p9_client *clnt; 2054 struct p9_req_t *req; 2055 2056 clnt = fid->clnt; 2057 p9_debug(P9_DEBUG_9P, 2058 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n", 2059 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2060 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2061 MAJOR(rdev), MINOR(rdev), gid); 2062 if (IS_ERR(req)) 2063 return PTR_ERR(req); 2064 2065 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2066 if (err) { 2067 trace_9p_protocol_dump(clnt, &req->rc); 2068 goto error; 2069 } 2070 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", 2071 qid->type, qid->path, qid->version); 2072 2073 error: 2074 p9_req_put(clnt, req); 2075 return err; 2076 } 2077 EXPORT_SYMBOL(p9_client_mknod_dotl); 2078 2079 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2080 kgid_t gid, struct p9_qid *qid) 2081 { 2082 int err; 2083 struct p9_client *clnt; 2084 struct p9_req_t *req; 2085 2086 clnt = fid->clnt; 2087 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2088 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2089 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", 2090 fid->fid, name, mode, gid); 2091 if (IS_ERR(req)) 2092 return PTR_ERR(req); 2093 2094 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); 2095 if (err) { 2096 trace_9p_protocol_dump(clnt, &req->rc); 2097 goto error; 2098 } 2099 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2100 qid->path, qid->version); 2101 2102 error: 2103 p9_req_put(clnt, req); 2104 return err; 2105 } 2106 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2107 2108 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2109 { 2110 int err; 2111 struct p9_client *clnt; 2112 struct p9_req_t *req; 2113 2114 clnt = fid->clnt; 2115 p9_debug(P9_DEBUG_9P, 2116 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n", 2117 fid->fid, flock->type, flock->flags, flock->start, 2118 flock->length, flock->proc_id, flock->client_id); 2119 2120 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2121 flock->flags, flock->start, flock->length, 2122 flock->proc_id, flock->client_id); 2123 2124 if (IS_ERR(req)) 2125 return PTR_ERR(req); 2126 2127 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); 2128 if (err) { 2129 trace_9p_protocol_dump(clnt, &req->rc); 2130 goto error; 2131 } 2132 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2133 error: 2134 p9_req_put(clnt, req); 2135 return err; 2136 } 2137 EXPORT_SYMBOL(p9_client_lock_dotl); 2138 2139 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2140 { 2141 int err; 2142 struct p9_client *clnt; 2143 struct p9_req_t *req; 2144 2145 clnt = fid->clnt; 2146 p9_debug(P9_DEBUG_9P, 2147 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n", 2148 fid->fid, glock->type, glock->start, glock->length, 2149 glock->proc_id, glock->client_id); 2150 2151 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, 2152 glock->type, glock->start, glock->length, 2153 glock->proc_id, glock->client_id); 2154 2155 if (IS_ERR(req)) 2156 return PTR_ERR(req); 2157 2158 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, 2159 &glock->start, &glock->length, &glock->proc_id, 2160 &glock->client_id); 2161 if (err) { 2162 trace_9p_protocol_dump(clnt, &req->rc); 2163 goto error; 2164 } 2165 p9_debug(P9_DEBUG_9P, 2166 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n", 2167 glock->type, glock->start, glock->length, 2168 glock->proc_id, glock->client_id); 2169 error: 2170 p9_req_put(clnt, req); 2171 return err; 2172 } 2173 EXPORT_SYMBOL(p9_client_getlock_dotl); 2174 2175 int p9_client_readlink(struct p9_fid *fid, char **target) 2176 { 2177 int err; 2178 struct p9_client *clnt; 2179 struct p9_req_t *req; 2180 2181 clnt = fid->clnt; 2182 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2183 2184 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2185 if (IS_ERR(req)) 2186 return PTR_ERR(req); 2187 2188 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); 2189 if (err) { 2190 trace_9p_protocol_dump(clnt, &req->rc); 2191 goto error; 2192 } 2193 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2194 error: 2195 p9_req_put(clnt, req); 2196 return err; 2197 } 2198 EXPORT_SYMBOL(p9_client_readlink); 2199 2200 int __init p9_client_init(void) 2201 { 2202 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); 2203 return p9_req_cache ? 0 : -ENOMEM; 2204 } 2205 2206 void __exit p9_client_exit(void) 2207 { 2208 kmem_cache_destroy(p9_req_cache); 2209 } 2210