1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * vfs operations that deal with files 5 * 6 * Copyright (C) International Business Machines Corp., 2002,2010 7 * Author(s): Steve French (sfrench@us.ibm.com) 8 * Jeremy Allison (jra@samba.org) 9 * 10 */ 11 #include <linux/fs.h> 12 #include <linux/filelock.h> 13 #include <linux/backing-dev.h> 14 #include <linux/stat.h> 15 #include <linux/fcntl.h> 16 #include <linux/pagemap.h> 17 #include <linux/pagevec.h> 18 #include <linux/writeback.h> 19 #include <linux/task_io_accounting_ops.h> 20 #include <linux/delay.h> 21 #include <linux/mount.h> 22 #include <linux/slab.h> 23 #include <linux/swap.h> 24 #include <linux/mm.h> 25 #include <asm/div64.h> 26 #include "cifsfs.h" 27 #include "cifspdu.h" 28 #include "cifsglob.h" 29 #include "cifsproto.h" 30 #include "smb2proto.h" 31 #include "cifs_unicode.h" 32 #include "cifs_debug.h" 33 #include "cifs_fs_sb.h" 34 #include "fscache.h" 35 #include "smbdirect.h" 36 #include "fs_context.h" 37 #include "cifs_ioctl.h" 38 #include "cached_dir.h" 39 #include <trace/events/netfs.h> 40 41 static int cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush); 42 43 /* 44 * Prepare a subrequest to upload to the server. We need to allocate credits 45 * so that we know the maximum amount of data that we can include in it. 46 */ 47 static void cifs_prepare_write(struct netfs_io_subrequest *subreq) 48 { 49 struct cifs_io_subrequest *wdata = 50 container_of(subreq, struct cifs_io_subrequest, subreq); 51 struct cifs_io_request *req = wdata->req; 52 struct TCP_Server_Info *server; 53 struct cifsFileInfo *open_file = req->cfile; 54 size_t wsize = req->rreq.wsize; 55 int rc; 56 57 if (!wdata->have_xid) { 58 wdata->xid = get_xid(); 59 wdata->have_xid = true; 60 } 61 62 server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses); 63 wdata->server = server; 64 65 retry: 66 if (open_file->invalidHandle) { 67 rc = cifs_reopen_file(open_file, false); 68 if (rc < 0) { 69 if (rc == -EAGAIN) 70 goto retry; 71 subreq->error = rc; 72 return netfs_prepare_write_failed(subreq); 73 } 74 } 75 76 rc = server->ops->wait_mtu_credits(server, wsize, &wdata->subreq.max_len, 77 &wdata->credits); 78 if (rc < 0) { 79 subreq->error = rc; 80 return netfs_prepare_write_failed(subreq); 81 } 82 83 wdata->credits.rreq_debug_id = subreq->rreq->debug_id; 84 wdata->credits.rreq_debug_index = subreq->debug_index; 85 wdata->credits.in_flight_check = 1; 86 trace_smb3_rw_credits(wdata->rreq->debug_id, 87 wdata->subreq.debug_index, 88 wdata->credits.value, 89 server->credits, server->in_flight, 90 wdata->credits.value, 91 cifs_trace_rw_credits_write_prepare); 92 93 #ifdef CONFIG_CIFS_SMB_DIRECT 94 if (server->smbd_conn) 95 subreq->max_nr_segs = server->smbd_conn->max_frmr_depth; 96 #endif 97 } 98 99 /* 100 * Issue a subrequest to upload to the server. 101 */ 102 static void cifs_issue_write(struct netfs_io_subrequest *subreq) 103 { 104 struct cifs_io_subrequest *wdata = 105 container_of(subreq, struct cifs_io_subrequest, subreq); 106 struct cifs_sb_info *sbi = CIFS_SB(subreq->rreq->inode->i_sb); 107 int rc; 108 109 if (cifs_forced_shutdown(sbi)) { 110 rc = -EIO; 111 goto fail; 112 } 113 114 rc = adjust_credits(wdata->server, wdata, cifs_trace_rw_credits_issue_write_adjust); 115 if (rc) 116 goto fail; 117 118 rc = -EAGAIN; 119 if (wdata->req->cfile->invalidHandle) 120 goto fail; 121 122 wdata->server->ops->async_writev(wdata); 123 out: 124 return; 125 126 fail: 127 if (rc == -EAGAIN) 128 trace_netfs_sreq(subreq, netfs_sreq_trace_retry); 129 else 130 trace_netfs_sreq(subreq, netfs_sreq_trace_fail); 131 add_credits_and_wake_if(wdata->server, &wdata->credits, 0); 132 cifs_write_subrequest_terminated(wdata, rc, false); 133 goto out; 134 } 135 136 static void cifs_netfs_invalidate_cache(struct netfs_io_request *wreq) 137 { 138 cifs_invalidate_cache(wreq->inode, 0); 139 } 140 141 /* 142 * Split the read up according to how many credits we can get for each piece. 143 * It's okay to sleep here if we need to wait for more credit to become 144 * available. 145 * 146 * We also choose the server and allocate an operation ID to be cleaned up 147 * later. 148 */ 149 static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) 150 { 151 struct netfs_io_request *rreq = subreq->rreq; 152 struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); 153 struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); 154 struct TCP_Server_Info *server = req->server; 155 struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); 156 size_t rsize = 0; 157 int rc; 158 159 rdata->xid = get_xid(); 160 rdata->have_xid = true; 161 rdata->server = server; 162 163 if (cifs_sb->ctx->rsize == 0) 164 cifs_sb->ctx->rsize = 165 server->ops->negotiate_rsize(tlink_tcon(req->cfile->tlink), 166 cifs_sb->ctx); 167 168 169 rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, &rsize, 170 &rdata->credits); 171 if (rc) { 172 subreq->error = rc; 173 return false; 174 } 175 176 rdata->credits.in_flight_check = 1; 177 rdata->credits.rreq_debug_id = rreq->debug_id; 178 rdata->credits.rreq_debug_index = subreq->debug_index; 179 180 trace_smb3_rw_credits(rdata->rreq->debug_id, 181 rdata->subreq.debug_index, 182 rdata->credits.value, 183 server->credits, server->in_flight, 0, 184 cifs_trace_rw_credits_read_submit); 185 186 subreq->len = min_t(size_t, subreq->len, rsize); 187 188 #ifdef CONFIG_CIFS_SMB_DIRECT 189 if (server->smbd_conn) 190 subreq->max_nr_segs = server->smbd_conn->max_frmr_depth; 191 #endif 192 return true; 193 } 194 195 /* 196 * Issue a read operation on behalf of the netfs helper functions. We're asked 197 * to make a read of a certain size at a point in the file. We are permitted 198 * to only read a portion of that, but as long as we read something, the netfs 199 * helper will call us again so that we can issue another read. 200 */ 201 static void cifs_req_issue_read(struct netfs_io_subrequest *subreq) 202 { 203 struct netfs_io_request *rreq = subreq->rreq; 204 struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); 205 struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); 206 int rc = 0; 207 208 cifs_dbg(FYI, "%s: op=%08x[%x] mapping=%p len=%zu/%zu\n", 209 __func__, rreq->debug_id, subreq->debug_index, rreq->mapping, 210 subreq->transferred, subreq->len); 211 212 if (req->cfile->invalidHandle) { 213 do { 214 rc = cifs_reopen_file(req->cfile, true); 215 } while (rc == -EAGAIN); 216 if (rc) 217 goto out; 218 } 219 220 if (subreq->rreq->origin != NETFS_DIO_READ) 221 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); 222 223 rc = rdata->server->ops->async_readv(rdata); 224 out: 225 if (rc) 226 netfs_subreq_terminated(subreq, rc, false); 227 } 228 229 /* 230 * Writeback calls this when it finds a folio that needs uploading. This isn't 231 * called if writeback only has copy-to-cache to deal with. 232 */ 233 static void cifs_begin_writeback(struct netfs_io_request *wreq) 234 { 235 struct cifs_io_request *req = container_of(wreq, struct cifs_io_request, rreq); 236 int ret; 237 238 ret = cifs_get_writable_file(CIFS_I(wreq->inode), FIND_WR_ANY, &req->cfile); 239 if (ret) { 240 cifs_dbg(VFS, "No writable handle in writepages ret=%d\n", ret); 241 return; 242 } 243 244 wreq->io_streams[0].avail = true; 245 } 246 247 /* 248 * Initialise a request. 249 */ 250 static int cifs_init_request(struct netfs_io_request *rreq, struct file *file) 251 { 252 struct cifs_io_request *req = container_of(rreq, struct cifs_io_request, rreq); 253 struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); 254 struct cifsFileInfo *open_file = NULL; 255 256 rreq->rsize = cifs_sb->ctx->rsize; 257 rreq->wsize = cifs_sb->ctx->wsize; 258 req->pid = current->tgid; // Ummm... This may be a workqueue 259 260 if (file) { 261 open_file = file->private_data; 262 rreq->netfs_priv = file->private_data; 263 req->cfile = cifsFileInfo_get(open_file); 264 req->server = cifs_pick_channel(tlink_tcon(req->cfile->tlink)->ses); 265 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) 266 req->pid = req->cfile->pid; 267 } else if (rreq->origin != NETFS_WRITEBACK) { 268 WARN_ON_ONCE(1); 269 return -EIO; 270 } 271 272 return 0; 273 } 274 275 /* 276 * Completion of a request operation. 277 */ 278 static void cifs_rreq_done(struct netfs_io_request *rreq) 279 { 280 struct timespec64 atime, mtime; 281 struct inode *inode = rreq->inode; 282 283 /* we do not want atime to be less than mtime, it broke some apps */ 284 atime = inode_set_atime_to_ts(inode, current_time(inode)); 285 mtime = inode_get_mtime(inode); 286 if (timespec64_compare(&atime, &mtime)) 287 inode_set_atime_to_ts(inode, inode_get_mtime(inode)); 288 } 289 290 static void cifs_post_modify(struct inode *inode) 291 { 292 /* Indication to update ctime and mtime as close is deferred */ 293 set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags); 294 } 295 296 static void cifs_free_request(struct netfs_io_request *rreq) 297 { 298 struct cifs_io_request *req = container_of(rreq, struct cifs_io_request, rreq); 299 300 if (req->cfile) 301 cifsFileInfo_put(req->cfile); 302 } 303 304 static void cifs_free_subrequest(struct netfs_io_subrequest *subreq) 305 { 306 struct cifs_io_subrequest *rdata = 307 container_of(subreq, struct cifs_io_subrequest, subreq); 308 int rc = subreq->error; 309 310 if (rdata->subreq.source == NETFS_DOWNLOAD_FROM_SERVER) { 311 #ifdef CONFIG_CIFS_SMB_DIRECT 312 if (rdata->mr) { 313 smbd_deregister_mr(rdata->mr); 314 rdata->mr = NULL; 315 } 316 #endif 317 } 318 319 if (rdata->credits.value != 0) { 320 trace_smb3_rw_credits(rdata->rreq->debug_id, 321 rdata->subreq.debug_index, 322 rdata->credits.value, 323 rdata->server ? rdata->server->credits : 0, 324 rdata->server ? rdata->server->in_flight : 0, 325 -rdata->credits.value, 326 cifs_trace_rw_credits_free_subreq); 327 if (rdata->server) 328 add_credits_and_wake_if(rdata->server, &rdata->credits, 0); 329 else 330 rdata->credits.value = 0; 331 } 332 333 if (rdata->have_xid) 334 free_xid(rdata->xid); 335 } 336 337 const struct netfs_request_ops cifs_req_ops = { 338 .request_pool = &cifs_io_request_pool, 339 .subrequest_pool = &cifs_io_subrequest_pool, 340 .init_request = cifs_init_request, 341 .free_request = cifs_free_request, 342 .free_subrequest = cifs_free_subrequest, 343 .clamp_length = cifs_clamp_length, 344 .issue_read = cifs_req_issue_read, 345 .done = cifs_rreq_done, 346 .post_modify = cifs_post_modify, 347 .begin_writeback = cifs_begin_writeback, 348 .prepare_write = cifs_prepare_write, 349 .issue_write = cifs_issue_write, 350 .invalidate_cache = cifs_netfs_invalidate_cache, 351 }; 352 353 /* 354 * Mark as invalid, all open files on tree connections since they 355 * were closed when session to server was lost. 356 */ 357 void 358 cifs_mark_open_files_invalid(struct cifs_tcon *tcon) 359 { 360 struct cifsFileInfo *open_file = NULL; 361 struct list_head *tmp; 362 struct list_head *tmp1; 363 364 /* only send once per connect */ 365 spin_lock(&tcon->tc_lock); 366 if (tcon->need_reconnect) 367 tcon->status = TID_NEED_RECON; 368 369 if (tcon->status != TID_NEED_RECON) { 370 spin_unlock(&tcon->tc_lock); 371 return; 372 } 373 tcon->status = TID_IN_FILES_INVALIDATE; 374 spin_unlock(&tcon->tc_lock); 375 376 /* list all files open on tree connection and mark them invalid */ 377 spin_lock(&tcon->open_file_lock); 378 list_for_each_safe(tmp, tmp1, &tcon->openFileList) { 379 open_file = list_entry(tmp, struct cifsFileInfo, tlist); 380 open_file->invalidHandle = true; 381 open_file->oplock_break_cancelled = true; 382 } 383 spin_unlock(&tcon->open_file_lock); 384 385 invalidate_all_cached_dirs(tcon); 386 spin_lock(&tcon->tc_lock); 387 if (tcon->status == TID_IN_FILES_INVALIDATE) 388 tcon->status = TID_NEED_TCON; 389 spin_unlock(&tcon->tc_lock); 390 391 /* 392 * BB Add call to invalidate_inodes(sb) for all superblocks mounted 393 * to this tcon. 394 */ 395 } 396 397 static inline int cifs_convert_flags(unsigned int flags, int rdwr_for_fscache) 398 { 399 if ((flags & O_ACCMODE) == O_RDONLY) 400 return GENERIC_READ; 401 else if ((flags & O_ACCMODE) == O_WRONLY) 402 return rdwr_for_fscache == 1 ? (GENERIC_READ | GENERIC_WRITE) : GENERIC_WRITE; 403 else if ((flags & O_ACCMODE) == O_RDWR) { 404 /* GENERIC_ALL is too much permission to request 405 can cause unnecessary access denied on create */ 406 /* return GENERIC_ALL; */ 407 return (GENERIC_READ | GENERIC_WRITE); 408 } 409 410 return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | 411 FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | 412 FILE_READ_DATA); 413 } 414 415 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 416 static u32 cifs_posix_convert_flags(unsigned int flags) 417 { 418 u32 posix_flags = 0; 419 420 if ((flags & O_ACCMODE) == O_RDONLY) 421 posix_flags = SMB_O_RDONLY; 422 else if ((flags & O_ACCMODE) == O_WRONLY) 423 posix_flags = SMB_O_WRONLY; 424 else if ((flags & O_ACCMODE) == O_RDWR) 425 posix_flags = SMB_O_RDWR; 426 427 if (flags & O_CREAT) { 428 posix_flags |= SMB_O_CREAT; 429 if (flags & O_EXCL) 430 posix_flags |= SMB_O_EXCL; 431 } else if (flags & O_EXCL) 432 cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", 433 current->comm, current->tgid); 434 435 if (flags & O_TRUNC) 436 posix_flags |= SMB_O_TRUNC; 437 /* be safe and imply O_SYNC for O_DSYNC */ 438 if (flags & O_DSYNC) 439 posix_flags |= SMB_O_SYNC; 440 if (flags & O_DIRECTORY) 441 posix_flags |= SMB_O_DIRECTORY; 442 if (flags & O_NOFOLLOW) 443 posix_flags |= SMB_O_NOFOLLOW; 444 if (flags & O_DIRECT) 445 posix_flags |= SMB_O_DIRECT; 446 447 return posix_flags; 448 } 449 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 450 451 static inline int cifs_get_disposition(unsigned int flags) 452 { 453 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) 454 return FILE_CREATE; 455 else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) 456 return FILE_OVERWRITE_IF; 457 else if ((flags & O_CREAT) == O_CREAT) 458 return FILE_OPEN_IF; 459 else if ((flags & O_TRUNC) == O_TRUNC) 460 return FILE_OVERWRITE; 461 else 462 return FILE_OPEN; 463 } 464 465 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 466 int cifs_posix_open(const char *full_path, struct inode **pinode, 467 struct super_block *sb, int mode, unsigned int f_flags, 468 __u32 *poplock, __u16 *pnetfid, unsigned int xid) 469 { 470 int rc; 471 FILE_UNIX_BASIC_INFO *presp_data; 472 __u32 posix_flags = 0; 473 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 474 struct cifs_fattr fattr; 475 struct tcon_link *tlink; 476 struct cifs_tcon *tcon; 477 478 cifs_dbg(FYI, "posix open %s\n", full_path); 479 480 presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); 481 if (presp_data == NULL) 482 return -ENOMEM; 483 484 tlink = cifs_sb_tlink(cifs_sb); 485 if (IS_ERR(tlink)) { 486 rc = PTR_ERR(tlink); 487 goto posix_open_ret; 488 } 489 490 tcon = tlink_tcon(tlink); 491 mode &= ~current_umask(); 492 493 posix_flags = cifs_posix_convert_flags(f_flags); 494 rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, 495 poplock, full_path, cifs_sb->local_nls, 496 cifs_remap(cifs_sb)); 497 cifs_put_tlink(tlink); 498 499 if (rc) 500 goto posix_open_ret; 501 502 if (presp_data->Type == cpu_to_le32(-1)) 503 goto posix_open_ret; /* open ok, caller does qpathinfo */ 504 505 if (!pinode) 506 goto posix_open_ret; /* caller does not need info */ 507 508 cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); 509 510 /* get new inode and set it up */ 511 if (*pinode == NULL) { 512 cifs_fill_uniqueid(sb, &fattr); 513 *pinode = cifs_iget(sb, &fattr); 514 if (!*pinode) { 515 rc = -ENOMEM; 516 goto posix_open_ret; 517 } 518 } else { 519 cifs_revalidate_mapping(*pinode); 520 rc = cifs_fattr_to_inode(*pinode, &fattr, false); 521 } 522 523 posix_open_ret: 524 kfree(presp_data); 525 return rc; 526 } 527 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 528 529 static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, 530 struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, 531 struct cifs_fid *fid, unsigned int xid, struct cifs_open_info_data *buf) 532 { 533 int rc; 534 int desired_access; 535 int disposition; 536 int create_options = CREATE_NOT_DIR; 537 struct TCP_Server_Info *server = tcon->ses->server; 538 struct cifs_open_parms oparms; 539 int rdwr_for_fscache = 0; 540 541 if (!server->ops->open) 542 return -ENOSYS; 543 544 /* If we're caching, we need to be able to fill in around partial writes. */ 545 if (cifs_fscache_enabled(inode) && (f_flags & O_ACCMODE) == O_WRONLY) 546 rdwr_for_fscache = 1; 547 548 desired_access = cifs_convert_flags(f_flags, rdwr_for_fscache); 549 550 /********************************************************************* 551 * open flag mapping table: 552 * 553 * POSIX Flag CIFS Disposition 554 * ---------- ---------------- 555 * O_CREAT FILE_OPEN_IF 556 * O_CREAT | O_EXCL FILE_CREATE 557 * O_CREAT | O_TRUNC FILE_OVERWRITE_IF 558 * O_TRUNC FILE_OVERWRITE 559 * none of the above FILE_OPEN 560 * 561 * Note that there is not a direct match between disposition 562 * FILE_SUPERSEDE (ie create whether or not file exists although 563 * O_CREAT | O_TRUNC is similar but truncates the existing 564 * file rather than creating a new file as FILE_SUPERSEDE does 565 * (which uses the attributes / metadata passed in on open call) 566 *? 567 *? O_SYNC is a reasonable match to CIFS writethrough flag 568 *? and the read write flags match reasonably. O_LARGEFILE 569 *? is irrelevant because largefile support is always used 570 *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, 571 * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation 572 *********************************************************************/ 573 574 disposition = cifs_get_disposition(f_flags); 575 576 /* BB pass O_SYNC flag through on file attributes .. BB */ 577 578 /* O_SYNC also has bit for O_DSYNC so following check picks up either */ 579 if (f_flags & O_SYNC) 580 create_options |= CREATE_WRITE_THROUGH; 581 582 if (f_flags & O_DIRECT) 583 create_options |= CREATE_NO_BUFFER; 584 585 retry_open: 586 oparms = (struct cifs_open_parms) { 587 .tcon = tcon, 588 .cifs_sb = cifs_sb, 589 .desired_access = desired_access, 590 .create_options = cifs_create_options(cifs_sb, create_options), 591 .disposition = disposition, 592 .path = full_path, 593 .fid = fid, 594 }; 595 596 rc = server->ops->open(xid, &oparms, oplock, buf); 597 if (rc) { 598 if (rc == -EACCES && rdwr_for_fscache == 1) { 599 desired_access = cifs_convert_flags(f_flags, 0); 600 rdwr_for_fscache = 2; 601 goto retry_open; 602 } 603 return rc; 604 } 605 if (rdwr_for_fscache == 2) 606 cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); 607 608 /* TODO: Add support for calling posix query info but with passing in fid */ 609 if (tcon->unix_ext) 610 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, 611 xid); 612 else 613 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, 614 xid, fid); 615 616 if (rc) { 617 server->ops->close(xid, tcon, fid); 618 if (rc == -ESTALE) 619 rc = -EOPENSTALE; 620 } 621 622 return rc; 623 } 624 625 static bool 626 cifs_has_mand_locks(struct cifsInodeInfo *cinode) 627 { 628 struct cifs_fid_locks *cur; 629 bool has_locks = false; 630 631 down_read(&cinode->lock_sem); 632 list_for_each_entry(cur, &cinode->llist, llist) { 633 if (!list_empty(&cur->locks)) { 634 has_locks = true; 635 break; 636 } 637 } 638 up_read(&cinode->lock_sem); 639 return has_locks; 640 } 641 642 void 643 cifs_down_write(struct rw_semaphore *sem) 644 { 645 while (!down_write_trylock(sem)) 646 msleep(10); 647 } 648 649 static void cifsFileInfo_put_work(struct work_struct *work); 650 void serverclose_work(struct work_struct *work); 651 652 struct cifsFileInfo *cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, 653 struct tcon_link *tlink, __u32 oplock, 654 const char *symlink_target) 655 { 656 struct dentry *dentry = file_dentry(file); 657 struct inode *inode = d_inode(dentry); 658 struct cifsInodeInfo *cinode = CIFS_I(inode); 659 struct cifsFileInfo *cfile; 660 struct cifs_fid_locks *fdlocks; 661 struct cifs_tcon *tcon = tlink_tcon(tlink); 662 struct TCP_Server_Info *server = tcon->ses->server; 663 664 cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); 665 if (cfile == NULL) 666 return cfile; 667 668 fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); 669 if (!fdlocks) { 670 kfree(cfile); 671 return NULL; 672 } 673 674 if (symlink_target) { 675 cfile->symlink_target = kstrdup(symlink_target, GFP_KERNEL); 676 if (!cfile->symlink_target) { 677 kfree(fdlocks); 678 kfree(cfile); 679 return NULL; 680 } 681 } 682 683 INIT_LIST_HEAD(&fdlocks->locks); 684 fdlocks->cfile = cfile; 685 cfile->llist = fdlocks; 686 687 cfile->count = 1; 688 cfile->pid = current->tgid; 689 cfile->uid = current_fsuid(); 690 cfile->dentry = dget(dentry); 691 cfile->f_flags = file->f_flags; 692 cfile->invalidHandle = false; 693 cfile->deferred_close_scheduled = false; 694 cfile->tlink = cifs_get_tlink(tlink); 695 INIT_WORK(&cfile->oplock_break, cifs_oplock_break); 696 INIT_WORK(&cfile->put, cifsFileInfo_put_work); 697 INIT_WORK(&cfile->serverclose, serverclose_work); 698 INIT_DELAYED_WORK(&cfile->deferred, smb2_deferred_work_close); 699 mutex_init(&cfile->fh_mutex); 700 spin_lock_init(&cfile->file_info_lock); 701 702 cifs_sb_active(inode->i_sb); 703 704 /* 705 * If the server returned a read oplock and we have mandatory brlocks, 706 * set oplock level to None. 707 */ 708 if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { 709 cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); 710 oplock = 0; 711 } 712 713 cifs_down_write(&cinode->lock_sem); 714 list_add(&fdlocks->llist, &cinode->llist); 715 up_write(&cinode->lock_sem); 716 717 spin_lock(&tcon->open_file_lock); 718 if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) 719 oplock = fid->pending_open->oplock; 720 list_del(&fid->pending_open->olist); 721 722 fid->purge_cache = false; 723 server->ops->set_fid(cfile, fid, oplock); 724 725 list_add(&cfile->tlist, &tcon->openFileList); 726 atomic_inc(&tcon->num_local_opens); 727 728 /* if readable file instance put first in list*/ 729 spin_lock(&cinode->open_file_lock); 730 if (file->f_mode & FMODE_READ) 731 list_add(&cfile->flist, &cinode->openFileList); 732 else 733 list_add_tail(&cfile->flist, &cinode->openFileList); 734 spin_unlock(&cinode->open_file_lock); 735 spin_unlock(&tcon->open_file_lock); 736 737 if (fid->purge_cache) 738 cifs_zap_mapping(inode); 739 740 file->private_data = cfile; 741 return cfile; 742 } 743 744 struct cifsFileInfo * 745 cifsFileInfo_get(struct cifsFileInfo *cifs_file) 746 { 747 spin_lock(&cifs_file->file_info_lock); 748 cifsFileInfo_get_locked(cifs_file); 749 spin_unlock(&cifs_file->file_info_lock); 750 return cifs_file; 751 } 752 753 static void cifsFileInfo_put_final(struct cifsFileInfo *cifs_file) 754 { 755 struct inode *inode = d_inode(cifs_file->dentry); 756 struct cifsInodeInfo *cifsi = CIFS_I(inode); 757 struct cifsLockInfo *li, *tmp; 758 struct super_block *sb = inode->i_sb; 759 760 /* 761 * Delete any outstanding lock records. We'll lose them when the file 762 * is closed anyway. 763 */ 764 cifs_down_write(&cifsi->lock_sem); 765 list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { 766 list_del(&li->llist); 767 cifs_del_lock_waiters(li); 768 kfree(li); 769 } 770 list_del(&cifs_file->llist->llist); 771 kfree(cifs_file->llist); 772 up_write(&cifsi->lock_sem); 773 774 cifs_put_tlink(cifs_file->tlink); 775 dput(cifs_file->dentry); 776 cifs_sb_deactive(sb); 777 kfree(cifs_file->symlink_target); 778 kfree(cifs_file); 779 } 780 781 static void cifsFileInfo_put_work(struct work_struct *work) 782 { 783 struct cifsFileInfo *cifs_file = container_of(work, 784 struct cifsFileInfo, put); 785 786 cifsFileInfo_put_final(cifs_file); 787 } 788 789 void serverclose_work(struct work_struct *work) 790 { 791 struct cifsFileInfo *cifs_file = container_of(work, 792 struct cifsFileInfo, serverclose); 793 794 struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); 795 796 struct TCP_Server_Info *server = tcon->ses->server; 797 int rc = 0; 798 int retries = 0; 799 int MAX_RETRIES = 4; 800 801 do { 802 if (server->ops->close_getattr) 803 rc = server->ops->close_getattr(0, tcon, cifs_file); 804 else if (server->ops->close) 805 rc = server->ops->close(0, tcon, &cifs_file->fid); 806 807 if (rc == -EBUSY || rc == -EAGAIN) { 808 retries++; 809 msleep(250); 810 } 811 } while ((rc == -EBUSY || rc == -EAGAIN) && (retries < MAX_RETRIES) 812 ); 813 814 if (retries == MAX_RETRIES) 815 pr_warn("Serverclose failed %d times, giving up\n", MAX_RETRIES); 816 817 if (cifs_file->offload) 818 queue_work(fileinfo_put_wq, &cifs_file->put); 819 else 820 cifsFileInfo_put_final(cifs_file); 821 } 822 823 /** 824 * cifsFileInfo_put - release a reference of file priv data 825 * 826 * Always potentially wait for oplock handler. See _cifsFileInfo_put(). 827 * 828 * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file 829 */ 830 void cifsFileInfo_put(struct cifsFileInfo *cifs_file) 831 { 832 _cifsFileInfo_put(cifs_file, true, true); 833 } 834 835 /** 836 * _cifsFileInfo_put - release a reference of file priv data 837 * 838 * This may involve closing the filehandle @cifs_file out on the 839 * server. Must be called without holding tcon->open_file_lock, 840 * cinode->open_file_lock and cifs_file->file_info_lock. 841 * 842 * If @wait_for_oplock_handler is true and we are releasing the last 843 * reference, wait for any running oplock break handler of the file 844 * and cancel any pending one. 845 * 846 * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file 847 * @wait_oplock_handler: must be false if called from oplock_break_handler 848 * @offload: not offloaded on close and oplock breaks 849 * 850 */ 851 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, 852 bool wait_oplock_handler, bool offload) 853 { 854 struct inode *inode = d_inode(cifs_file->dentry); 855 struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); 856 struct TCP_Server_Info *server = tcon->ses->server; 857 struct cifsInodeInfo *cifsi = CIFS_I(inode); 858 struct super_block *sb = inode->i_sb; 859 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 860 struct cifs_fid fid = {}; 861 struct cifs_pending_open open; 862 bool oplock_break_cancelled; 863 bool serverclose_offloaded = false; 864 865 spin_lock(&tcon->open_file_lock); 866 spin_lock(&cifsi->open_file_lock); 867 spin_lock(&cifs_file->file_info_lock); 868 869 cifs_file->offload = offload; 870 if (--cifs_file->count > 0) { 871 spin_unlock(&cifs_file->file_info_lock); 872 spin_unlock(&cifsi->open_file_lock); 873 spin_unlock(&tcon->open_file_lock); 874 return; 875 } 876 spin_unlock(&cifs_file->file_info_lock); 877 878 if (server->ops->get_lease_key) 879 server->ops->get_lease_key(inode, &fid); 880 881 /* store open in pending opens to make sure we don't miss lease break */ 882 cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); 883 884 /* remove it from the lists */ 885 list_del(&cifs_file->flist); 886 list_del(&cifs_file->tlist); 887 atomic_dec(&tcon->num_local_opens); 888 889 if (list_empty(&cifsi->openFileList)) { 890 cifs_dbg(FYI, "closing last open instance for inode %p\n", 891 d_inode(cifs_file->dentry)); 892 /* 893 * In strict cache mode we need invalidate mapping on the last 894 * close because it may cause a error when we open this file 895 * again and get at least level II oplock. 896 */ 897 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) 898 set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags); 899 cifs_set_oplock_level(cifsi, 0); 900 } 901 902 spin_unlock(&cifsi->open_file_lock); 903 spin_unlock(&tcon->open_file_lock); 904 905 oplock_break_cancelled = wait_oplock_handler ? 906 cancel_work_sync(&cifs_file->oplock_break) : false; 907 908 if (!tcon->need_reconnect && !cifs_file->invalidHandle) { 909 struct TCP_Server_Info *server = tcon->ses->server; 910 unsigned int xid; 911 int rc = 0; 912 913 xid = get_xid(); 914 if (server->ops->close_getattr) 915 rc = server->ops->close_getattr(xid, tcon, cifs_file); 916 else if (server->ops->close) 917 rc = server->ops->close(xid, tcon, &cifs_file->fid); 918 _free_xid(xid); 919 920 if (rc == -EBUSY || rc == -EAGAIN) { 921 // Server close failed, hence offloading it as an async op 922 queue_work(serverclose_wq, &cifs_file->serverclose); 923 serverclose_offloaded = true; 924 } 925 } 926 927 if (oplock_break_cancelled) 928 cifs_done_oplock_break(cifsi); 929 930 cifs_del_pending_open(&open); 931 932 // if serverclose has been offloaded to wq (on failure), it will 933 // handle offloading put as well. If serverclose not offloaded, 934 // we need to handle offloading put here. 935 if (!serverclose_offloaded) { 936 if (offload) 937 queue_work(fileinfo_put_wq, &cifs_file->put); 938 else 939 cifsFileInfo_put_final(cifs_file); 940 } 941 } 942 943 int cifs_open(struct inode *inode, struct file *file) 944 945 { 946 int rc = -EACCES; 947 unsigned int xid; 948 __u32 oplock; 949 struct cifs_sb_info *cifs_sb; 950 struct TCP_Server_Info *server; 951 struct cifs_tcon *tcon; 952 struct tcon_link *tlink; 953 struct cifsFileInfo *cfile = NULL; 954 void *page; 955 const char *full_path; 956 bool posix_open_ok = false; 957 struct cifs_fid fid = {}; 958 struct cifs_pending_open open; 959 struct cifs_open_info_data data = {}; 960 961 xid = get_xid(); 962 963 cifs_sb = CIFS_SB(inode->i_sb); 964 if (unlikely(cifs_forced_shutdown(cifs_sb))) { 965 free_xid(xid); 966 return -EIO; 967 } 968 969 tlink = cifs_sb_tlink(cifs_sb); 970 if (IS_ERR(tlink)) { 971 free_xid(xid); 972 return PTR_ERR(tlink); 973 } 974 tcon = tlink_tcon(tlink); 975 server = tcon->ses->server; 976 977 page = alloc_dentry_path(); 978 full_path = build_path_from_dentry(file_dentry(file), page); 979 if (IS_ERR(full_path)) { 980 rc = PTR_ERR(full_path); 981 goto out; 982 } 983 984 cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", 985 inode, file->f_flags, full_path); 986 987 if (file->f_flags & O_DIRECT && 988 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { 989 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) 990 file->f_op = &cifs_file_direct_nobrl_ops; 991 else 992 file->f_op = &cifs_file_direct_ops; 993 } 994 995 /* Get the cached handle as SMB2 close is deferred */ 996 rc = cifs_get_readable_path(tcon, full_path, &cfile); 997 if (rc == 0) { 998 if (file->f_flags == cfile->f_flags) { 999 file->private_data = cfile; 1000 spin_lock(&CIFS_I(inode)->deferred_lock); 1001 cifs_del_deferred_close(cfile); 1002 spin_unlock(&CIFS_I(inode)->deferred_lock); 1003 goto use_cache; 1004 } else { 1005 _cifsFileInfo_put(cfile, true, false); 1006 } 1007 } 1008 1009 if (server->oplocks) 1010 oplock = REQ_OPLOCK; 1011 else 1012 oplock = 0; 1013 1014 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1015 if (!tcon->broken_posix_open && tcon->unix_ext && 1016 cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & 1017 le64_to_cpu(tcon->fsUnixInfo.Capability))) { 1018 /* can not refresh inode info since size could be stale */ 1019 rc = cifs_posix_open(full_path, &inode, inode->i_sb, 1020 cifs_sb->ctx->file_mode /* ignored */, 1021 file->f_flags, &oplock, &fid.netfid, xid); 1022 if (rc == 0) { 1023 cifs_dbg(FYI, "posix open succeeded\n"); 1024 posix_open_ok = true; 1025 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { 1026 if (tcon->ses->serverNOS) 1027 cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", 1028 tcon->ses->ip_addr, 1029 tcon->ses->serverNOS); 1030 tcon->broken_posix_open = true; 1031 } else if ((rc != -EIO) && (rc != -EREMOTE) && 1032 (rc != -EOPNOTSUPP)) /* path not found or net err */ 1033 goto out; 1034 /* 1035 * Else fallthrough to retry open the old way on network i/o 1036 * or DFS errors. 1037 */ 1038 } 1039 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1040 1041 if (server->ops->get_lease_key) 1042 server->ops->get_lease_key(inode, &fid); 1043 1044 cifs_add_pending_open(&fid, tlink, &open); 1045 1046 if (!posix_open_ok) { 1047 if (server->ops->get_lease_key) 1048 server->ops->get_lease_key(inode, &fid); 1049 1050 rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, file->f_flags, &oplock, &fid, 1051 xid, &data); 1052 if (rc) { 1053 cifs_del_pending_open(&open); 1054 goto out; 1055 } 1056 } 1057 1058 cfile = cifs_new_fileinfo(&fid, file, tlink, oplock, data.symlink_target); 1059 if (cfile == NULL) { 1060 if (server->ops->close) 1061 server->ops->close(xid, tcon, &fid); 1062 cifs_del_pending_open(&open); 1063 rc = -ENOMEM; 1064 goto out; 1065 } 1066 1067 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1068 if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { 1069 /* 1070 * Time to set mode which we can not set earlier due to 1071 * problems creating new read-only files. 1072 */ 1073 struct cifs_unix_set_info_args args = { 1074 .mode = inode->i_mode, 1075 .uid = INVALID_UID, /* no change */ 1076 .gid = INVALID_GID, /* no change */ 1077 .ctime = NO_CHANGE_64, 1078 .atime = NO_CHANGE_64, 1079 .mtime = NO_CHANGE_64, 1080 .device = 0, 1081 }; 1082 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, 1083 cfile->pid); 1084 } 1085 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1086 1087 use_cache: 1088 fscache_use_cookie(cifs_inode_cookie(file_inode(file)), 1089 file->f_mode & FMODE_WRITE); 1090 if (!(file->f_flags & O_DIRECT)) 1091 goto out; 1092 if ((file->f_flags & (O_ACCMODE | O_APPEND)) == O_RDONLY) 1093 goto out; 1094 cifs_invalidate_cache(file_inode(file), FSCACHE_INVAL_DIO_WRITE); 1095 1096 out: 1097 free_dentry_path(page); 1098 free_xid(xid); 1099 cifs_put_tlink(tlink); 1100 cifs_free_open_info(&data); 1101 return rc; 1102 } 1103 1104 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1105 static int cifs_push_posix_locks(struct cifsFileInfo *cfile); 1106 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1107 1108 /* 1109 * Try to reacquire byte range locks that were released when session 1110 * to server was lost. 1111 */ 1112 static int 1113 cifs_relock_file(struct cifsFileInfo *cfile) 1114 { 1115 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 1116 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 1117 int rc = 0; 1118 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1119 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); 1120 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1121 1122 down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING); 1123 if (cinode->can_cache_brlcks) { 1124 /* can cache locks - no need to relock */ 1125 up_read(&cinode->lock_sem); 1126 return rc; 1127 } 1128 1129 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1130 if (cap_unix(tcon->ses) && 1131 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && 1132 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) 1133 rc = cifs_push_posix_locks(cfile); 1134 else 1135 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1136 rc = tcon->ses->server->ops->push_mand_locks(cfile); 1137 1138 up_read(&cinode->lock_sem); 1139 return rc; 1140 } 1141 1142 static int 1143 cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) 1144 { 1145 int rc = -EACCES; 1146 unsigned int xid; 1147 __u32 oplock; 1148 struct cifs_sb_info *cifs_sb; 1149 struct cifs_tcon *tcon; 1150 struct TCP_Server_Info *server; 1151 struct cifsInodeInfo *cinode; 1152 struct inode *inode; 1153 void *page; 1154 const char *full_path; 1155 int desired_access; 1156 int disposition = FILE_OPEN; 1157 int create_options = CREATE_NOT_DIR; 1158 struct cifs_open_parms oparms; 1159 int rdwr_for_fscache = 0; 1160 1161 xid = get_xid(); 1162 mutex_lock(&cfile->fh_mutex); 1163 if (!cfile->invalidHandle) { 1164 mutex_unlock(&cfile->fh_mutex); 1165 free_xid(xid); 1166 return 0; 1167 } 1168 1169 inode = d_inode(cfile->dentry); 1170 cifs_sb = CIFS_SB(inode->i_sb); 1171 tcon = tlink_tcon(cfile->tlink); 1172 server = tcon->ses->server; 1173 1174 /* 1175 * Can not grab rename sem here because various ops, including those 1176 * that already have the rename sem can end up causing writepage to get 1177 * called and if the server was down that means we end up here, and we 1178 * can never tell if the caller already has the rename_sem. 1179 */ 1180 page = alloc_dentry_path(); 1181 full_path = build_path_from_dentry(cfile->dentry, page); 1182 if (IS_ERR(full_path)) { 1183 mutex_unlock(&cfile->fh_mutex); 1184 free_dentry_path(page); 1185 free_xid(xid); 1186 return PTR_ERR(full_path); 1187 } 1188 1189 cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", 1190 inode, cfile->f_flags, full_path); 1191 1192 if (tcon->ses->server->oplocks) 1193 oplock = REQ_OPLOCK; 1194 else 1195 oplock = 0; 1196 1197 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1198 if (tcon->unix_ext && cap_unix(tcon->ses) && 1199 (CIFS_UNIX_POSIX_PATH_OPS_CAP & 1200 le64_to_cpu(tcon->fsUnixInfo.Capability))) { 1201 /* 1202 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the 1203 * original open. Must mask them off for a reopen. 1204 */ 1205 unsigned int oflags = cfile->f_flags & 1206 ~(O_CREAT | O_EXCL | O_TRUNC); 1207 1208 rc = cifs_posix_open(full_path, NULL, inode->i_sb, 1209 cifs_sb->ctx->file_mode /* ignored */, 1210 oflags, &oplock, &cfile->fid.netfid, xid); 1211 if (rc == 0) { 1212 cifs_dbg(FYI, "posix reopen succeeded\n"); 1213 oparms.reconnect = true; 1214 goto reopen_success; 1215 } 1216 /* 1217 * fallthrough to retry open the old way on errors, especially 1218 * in the reconnect path it is important to retry hard 1219 */ 1220 } 1221 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1222 1223 /* If we're caching, we need to be able to fill in around partial writes. */ 1224 if (cifs_fscache_enabled(inode) && (cfile->f_flags & O_ACCMODE) == O_WRONLY) 1225 rdwr_for_fscache = 1; 1226 1227 desired_access = cifs_convert_flags(cfile->f_flags, rdwr_for_fscache); 1228 1229 /* O_SYNC also has bit for O_DSYNC so following check picks up either */ 1230 if (cfile->f_flags & O_SYNC) 1231 create_options |= CREATE_WRITE_THROUGH; 1232 1233 if (cfile->f_flags & O_DIRECT) 1234 create_options |= CREATE_NO_BUFFER; 1235 1236 if (server->ops->get_lease_key) 1237 server->ops->get_lease_key(inode, &cfile->fid); 1238 1239 retry_open: 1240 oparms = (struct cifs_open_parms) { 1241 .tcon = tcon, 1242 .cifs_sb = cifs_sb, 1243 .desired_access = desired_access, 1244 .create_options = cifs_create_options(cifs_sb, create_options), 1245 .disposition = disposition, 1246 .path = full_path, 1247 .fid = &cfile->fid, 1248 .reconnect = true, 1249 }; 1250 1251 /* 1252 * Can not refresh inode by passing in file_info buf to be returned by 1253 * ops->open and then calling get_inode_info with returned buf since 1254 * file might have write behind data that needs to be flushed and server 1255 * version of file size can be stale. If we knew for sure that inode was 1256 * not dirty locally we could do this. 1257 */ 1258 rc = server->ops->open(xid, &oparms, &oplock, NULL); 1259 if (rc == -ENOENT && oparms.reconnect == false) { 1260 /* durable handle timeout is expired - open the file again */ 1261 rc = server->ops->open(xid, &oparms, &oplock, NULL); 1262 /* indicate that we need to relock the file */ 1263 oparms.reconnect = true; 1264 } 1265 if (rc == -EACCES && rdwr_for_fscache == 1) { 1266 desired_access = cifs_convert_flags(cfile->f_flags, 0); 1267 rdwr_for_fscache = 2; 1268 goto retry_open; 1269 } 1270 1271 if (rc) { 1272 mutex_unlock(&cfile->fh_mutex); 1273 cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); 1274 cifs_dbg(FYI, "oplock: %d\n", oplock); 1275 goto reopen_error_exit; 1276 } 1277 1278 if (rdwr_for_fscache == 2) 1279 cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); 1280 1281 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1282 reopen_success: 1283 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1284 cfile->invalidHandle = false; 1285 mutex_unlock(&cfile->fh_mutex); 1286 cinode = CIFS_I(inode); 1287 1288 if (can_flush) { 1289 rc = filemap_write_and_wait(inode->i_mapping); 1290 if (!is_interrupt_error(rc)) 1291 mapping_set_error(inode->i_mapping, rc); 1292 1293 if (tcon->posix_extensions) { 1294 rc = smb311_posix_get_inode_info(&inode, full_path, 1295 NULL, inode->i_sb, xid); 1296 } else if (tcon->unix_ext) { 1297 rc = cifs_get_inode_info_unix(&inode, full_path, 1298 inode->i_sb, xid); 1299 } else { 1300 rc = cifs_get_inode_info(&inode, full_path, NULL, 1301 inode->i_sb, xid, NULL); 1302 } 1303 } 1304 /* 1305 * Else we are writing out data to server already and could deadlock if 1306 * we tried to flush data, and since we do not know if we have data that 1307 * would invalidate the current end of file on the server we can not go 1308 * to the server to get the new inode info. 1309 */ 1310 1311 /* 1312 * If the server returned a read oplock and we have mandatory brlocks, 1313 * set oplock level to None. 1314 */ 1315 if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { 1316 cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); 1317 oplock = 0; 1318 } 1319 1320 server->ops->set_fid(cfile, &cfile->fid, oplock); 1321 if (oparms.reconnect) 1322 cifs_relock_file(cfile); 1323 1324 reopen_error_exit: 1325 free_dentry_path(page); 1326 free_xid(xid); 1327 return rc; 1328 } 1329 1330 void smb2_deferred_work_close(struct work_struct *work) 1331 { 1332 struct cifsFileInfo *cfile = container_of(work, 1333 struct cifsFileInfo, deferred.work); 1334 1335 spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); 1336 cifs_del_deferred_close(cfile); 1337 cfile->deferred_close_scheduled = false; 1338 spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); 1339 _cifsFileInfo_put(cfile, true, false); 1340 } 1341 1342 static bool 1343 smb2_can_defer_close(struct inode *inode, struct cifs_deferred_close *dclose) 1344 { 1345 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1346 struct cifsInodeInfo *cinode = CIFS_I(inode); 1347 1348 return (cifs_sb->ctx->closetimeo && cinode->lease_granted && dclose && 1349 (cinode->oplock == CIFS_CACHE_RHW_FLG || 1350 cinode->oplock == CIFS_CACHE_RH_FLG) && 1351 !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags)); 1352 1353 } 1354 1355 int cifs_close(struct inode *inode, struct file *file) 1356 { 1357 struct cifsFileInfo *cfile; 1358 struct cifsInodeInfo *cinode = CIFS_I(inode); 1359 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1360 struct cifs_deferred_close *dclose; 1361 1362 cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE); 1363 1364 if (file->private_data != NULL) { 1365 cfile = file->private_data; 1366 file->private_data = NULL; 1367 dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL); 1368 if ((cfile->status_file_deleted == false) && 1369 (smb2_can_defer_close(inode, dclose))) { 1370 if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) { 1371 inode_set_mtime_to_ts(inode, 1372 inode_set_ctime_current(inode)); 1373 } 1374 spin_lock(&cinode->deferred_lock); 1375 cifs_add_deferred_close(cfile, dclose); 1376 if (cfile->deferred_close_scheduled && 1377 delayed_work_pending(&cfile->deferred)) { 1378 /* 1379 * If there is no pending work, mod_delayed_work queues new work. 1380 * So, Increase the ref count to avoid use-after-free. 1381 */ 1382 if (!mod_delayed_work(deferredclose_wq, 1383 &cfile->deferred, cifs_sb->ctx->closetimeo)) 1384 cifsFileInfo_get(cfile); 1385 } else { 1386 /* Deferred close for files */ 1387 queue_delayed_work(deferredclose_wq, 1388 &cfile->deferred, cifs_sb->ctx->closetimeo); 1389 cfile->deferred_close_scheduled = true; 1390 spin_unlock(&cinode->deferred_lock); 1391 return 0; 1392 } 1393 spin_unlock(&cinode->deferred_lock); 1394 _cifsFileInfo_put(cfile, true, false); 1395 } else { 1396 _cifsFileInfo_put(cfile, true, false); 1397 kfree(dclose); 1398 } 1399 } 1400 1401 /* return code from the ->release op is always ignored */ 1402 return 0; 1403 } 1404 1405 void 1406 cifs_reopen_persistent_handles(struct cifs_tcon *tcon) 1407 { 1408 struct cifsFileInfo *open_file, *tmp; 1409 struct list_head tmp_list; 1410 1411 if (!tcon->use_persistent || !tcon->need_reopen_files) 1412 return; 1413 1414 tcon->need_reopen_files = false; 1415 1416 cifs_dbg(FYI, "Reopen persistent handles\n"); 1417 INIT_LIST_HEAD(&tmp_list); 1418 1419 /* list all files open on tree connection, reopen resilient handles */ 1420 spin_lock(&tcon->open_file_lock); 1421 list_for_each_entry(open_file, &tcon->openFileList, tlist) { 1422 if (!open_file->invalidHandle) 1423 continue; 1424 cifsFileInfo_get(open_file); 1425 list_add_tail(&open_file->rlist, &tmp_list); 1426 } 1427 spin_unlock(&tcon->open_file_lock); 1428 1429 list_for_each_entry_safe(open_file, tmp, &tmp_list, rlist) { 1430 if (cifs_reopen_file(open_file, false /* do not flush */)) 1431 tcon->need_reopen_files = true; 1432 list_del_init(&open_file->rlist); 1433 cifsFileInfo_put(open_file); 1434 } 1435 } 1436 1437 int cifs_closedir(struct inode *inode, struct file *file) 1438 { 1439 int rc = 0; 1440 unsigned int xid; 1441 struct cifsFileInfo *cfile = file->private_data; 1442 struct cifs_tcon *tcon; 1443 struct TCP_Server_Info *server; 1444 char *buf; 1445 1446 cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); 1447 1448 if (cfile == NULL) 1449 return rc; 1450 1451 xid = get_xid(); 1452 tcon = tlink_tcon(cfile->tlink); 1453 server = tcon->ses->server; 1454 1455 cifs_dbg(FYI, "Freeing private data in close dir\n"); 1456 spin_lock(&cfile->file_info_lock); 1457 if (server->ops->dir_needs_close(cfile)) { 1458 cfile->invalidHandle = true; 1459 spin_unlock(&cfile->file_info_lock); 1460 if (server->ops->close_dir) 1461 rc = server->ops->close_dir(xid, tcon, &cfile->fid); 1462 else 1463 rc = -ENOSYS; 1464 cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); 1465 /* not much we can do if it fails anyway, ignore rc */ 1466 rc = 0; 1467 } else 1468 spin_unlock(&cfile->file_info_lock); 1469 1470 buf = cfile->srch_inf.ntwrk_buf_start; 1471 if (buf) { 1472 cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); 1473 cfile->srch_inf.ntwrk_buf_start = NULL; 1474 if (cfile->srch_inf.smallBuf) 1475 cifs_small_buf_release(buf); 1476 else 1477 cifs_buf_release(buf); 1478 } 1479 1480 cifs_put_tlink(cfile->tlink); 1481 kfree(file->private_data); 1482 file->private_data = NULL; 1483 /* BB can we lock the filestruct while this is going on? */ 1484 free_xid(xid); 1485 return rc; 1486 } 1487 1488 static struct cifsLockInfo * 1489 cifs_lock_init(__u64 offset, __u64 length, __u8 type, __u16 flags) 1490 { 1491 struct cifsLockInfo *lock = 1492 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); 1493 if (!lock) 1494 return lock; 1495 lock->offset = offset; 1496 lock->length = length; 1497 lock->type = type; 1498 lock->pid = current->tgid; 1499 lock->flags = flags; 1500 INIT_LIST_HEAD(&lock->blist); 1501 init_waitqueue_head(&lock->block_q); 1502 return lock; 1503 } 1504 1505 void 1506 cifs_del_lock_waiters(struct cifsLockInfo *lock) 1507 { 1508 struct cifsLockInfo *li, *tmp; 1509 list_for_each_entry_safe(li, tmp, &lock->blist, blist) { 1510 list_del_init(&li->blist); 1511 wake_up(&li->block_q); 1512 } 1513 } 1514 1515 #define CIFS_LOCK_OP 0 1516 #define CIFS_READ_OP 1 1517 #define CIFS_WRITE_OP 2 1518 1519 /* @rw_check : 0 - no op, 1 - read, 2 - write */ 1520 static bool 1521 cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, 1522 __u64 length, __u8 type, __u16 flags, 1523 struct cifsFileInfo *cfile, 1524 struct cifsLockInfo **conf_lock, int rw_check) 1525 { 1526 struct cifsLockInfo *li; 1527 struct cifsFileInfo *cur_cfile = fdlocks->cfile; 1528 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; 1529 1530 list_for_each_entry(li, &fdlocks->locks, llist) { 1531 if (offset + length <= li->offset || 1532 offset >= li->offset + li->length) 1533 continue; 1534 if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && 1535 server->ops->compare_fids(cfile, cur_cfile)) { 1536 /* shared lock prevents write op through the same fid */ 1537 if (!(li->type & server->vals->shared_lock_type) || 1538 rw_check != CIFS_WRITE_OP) 1539 continue; 1540 } 1541 if ((type & server->vals->shared_lock_type) && 1542 ((server->ops->compare_fids(cfile, cur_cfile) && 1543 current->tgid == li->pid) || type == li->type)) 1544 continue; 1545 if (rw_check == CIFS_LOCK_OP && 1546 (flags & FL_OFDLCK) && (li->flags & FL_OFDLCK) && 1547 server->ops->compare_fids(cfile, cur_cfile)) 1548 continue; 1549 if (conf_lock) 1550 *conf_lock = li; 1551 return true; 1552 } 1553 return false; 1554 } 1555 1556 bool 1557 cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, 1558 __u8 type, __u16 flags, 1559 struct cifsLockInfo **conf_lock, int rw_check) 1560 { 1561 bool rc = false; 1562 struct cifs_fid_locks *cur; 1563 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 1564 1565 list_for_each_entry(cur, &cinode->llist, llist) { 1566 rc = cifs_find_fid_lock_conflict(cur, offset, length, type, 1567 flags, cfile, conf_lock, 1568 rw_check); 1569 if (rc) 1570 break; 1571 } 1572 1573 return rc; 1574 } 1575 1576 /* 1577 * Check if there is another lock that prevents us to set the lock (mandatory 1578 * style). If such a lock exists, update the flock structure with its 1579 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks 1580 * or leave it the same if we can't. Returns 0 if we don't need to request to 1581 * the server or 1 otherwise. 1582 */ 1583 static int 1584 cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, 1585 __u8 type, struct file_lock *flock) 1586 { 1587 int rc = 0; 1588 struct cifsLockInfo *conf_lock; 1589 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 1590 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; 1591 bool exist; 1592 1593 down_read(&cinode->lock_sem); 1594 1595 exist = cifs_find_lock_conflict(cfile, offset, length, type, 1596 flock->c.flc_flags, &conf_lock, 1597 CIFS_LOCK_OP); 1598 if (exist) { 1599 flock->fl_start = conf_lock->offset; 1600 flock->fl_end = conf_lock->offset + conf_lock->length - 1; 1601 flock->c.flc_pid = conf_lock->pid; 1602 if (conf_lock->type & server->vals->shared_lock_type) 1603 flock->c.flc_type = F_RDLCK; 1604 else 1605 flock->c.flc_type = F_WRLCK; 1606 } else if (!cinode->can_cache_brlcks) 1607 rc = 1; 1608 else 1609 flock->c.flc_type = F_UNLCK; 1610 1611 up_read(&cinode->lock_sem); 1612 return rc; 1613 } 1614 1615 static void 1616 cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) 1617 { 1618 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 1619 cifs_down_write(&cinode->lock_sem); 1620 list_add_tail(&lock->llist, &cfile->llist->locks); 1621 up_write(&cinode->lock_sem); 1622 } 1623 1624 /* 1625 * Set the byte-range lock (mandatory style). Returns: 1626 * 1) 0, if we set the lock and don't need to request to the server; 1627 * 2) 1, if no locks prevent us but we need to request to the server; 1628 * 3) -EACCES, if there is a lock that prevents us and wait is false. 1629 */ 1630 static int 1631 cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, 1632 bool wait) 1633 { 1634 struct cifsLockInfo *conf_lock; 1635 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 1636 bool exist; 1637 int rc = 0; 1638 1639 try_again: 1640 exist = false; 1641 cifs_down_write(&cinode->lock_sem); 1642 1643 exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, 1644 lock->type, lock->flags, &conf_lock, 1645 CIFS_LOCK_OP); 1646 if (!exist && cinode->can_cache_brlcks) { 1647 list_add_tail(&lock->llist, &cfile->llist->locks); 1648 up_write(&cinode->lock_sem); 1649 return rc; 1650 } 1651 1652 if (!exist) 1653 rc = 1; 1654 else if (!wait) 1655 rc = -EACCES; 1656 else { 1657 list_add_tail(&lock->blist, &conf_lock->blist); 1658 up_write(&cinode->lock_sem); 1659 rc = wait_event_interruptible(lock->block_q, 1660 (lock->blist.prev == &lock->blist) && 1661 (lock->blist.next == &lock->blist)); 1662 if (!rc) 1663 goto try_again; 1664 cifs_down_write(&cinode->lock_sem); 1665 list_del_init(&lock->blist); 1666 } 1667 1668 up_write(&cinode->lock_sem); 1669 return rc; 1670 } 1671 1672 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1673 /* 1674 * Check if there is another lock that prevents us to set the lock (posix 1675 * style). If such a lock exists, update the flock structure with its 1676 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks 1677 * or leave it the same if we can't. Returns 0 if we don't need to request to 1678 * the server or 1 otherwise. 1679 */ 1680 static int 1681 cifs_posix_lock_test(struct file *file, struct file_lock *flock) 1682 { 1683 int rc = 0; 1684 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); 1685 unsigned char saved_type = flock->c.flc_type; 1686 1687 if ((flock->c.flc_flags & FL_POSIX) == 0) 1688 return 1; 1689 1690 down_read(&cinode->lock_sem); 1691 posix_test_lock(file, flock); 1692 1693 if (lock_is_unlock(flock) && !cinode->can_cache_brlcks) { 1694 flock->c.flc_type = saved_type; 1695 rc = 1; 1696 } 1697 1698 up_read(&cinode->lock_sem); 1699 return rc; 1700 } 1701 1702 /* 1703 * Set the byte-range lock (posix style). Returns: 1704 * 1) <0, if the error occurs while setting the lock; 1705 * 2) 0, if we set the lock and don't need to request to the server; 1706 * 3) FILE_LOCK_DEFERRED, if we will wait for some other file_lock; 1707 * 4) FILE_LOCK_DEFERRED + 1, if we need to request to the server. 1708 */ 1709 static int 1710 cifs_posix_lock_set(struct file *file, struct file_lock *flock) 1711 { 1712 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); 1713 int rc = FILE_LOCK_DEFERRED + 1; 1714 1715 if ((flock->c.flc_flags & FL_POSIX) == 0) 1716 return rc; 1717 1718 cifs_down_write(&cinode->lock_sem); 1719 if (!cinode->can_cache_brlcks) { 1720 up_write(&cinode->lock_sem); 1721 return rc; 1722 } 1723 1724 rc = posix_lock_file(file, flock, NULL); 1725 up_write(&cinode->lock_sem); 1726 return rc; 1727 } 1728 1729 int 1730 cifs_push_mandatory_locks(struct cifsFileInfo *cfile) 1731 { 1732 unsigned int xid; 1733 int rc = 0, stored_rc; 1734 struct cifsLockInfo *li, *tmp; 1735 struct cifs_tcon *tcon; 1736 unsigned int num, max_num, max_buf; 1737 LOCKING_ANDX_RANGE *buf, *cur; 1738 static const int types[] = { 1739 LOCKING_ANDX_LARGE_FILES, 1740 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES 1741 }; 1742 int i; 1743 1744 xid = get_xid(); 1745 tcon = tlink_tcon(cfile->tlink); 1746 1747 /* 1748 * Accessing maxBuf is racy with cifs_reconnect - need to store value 1749 * and check it before using. 1750 */ 1751 max_buf = tcon->ses->server->maxBuf; 1752 if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) { 1753 free_xid(xid); 1754 return -EINVAL; 1755 } 1756 1757 BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) > 1758 PAGE_SIZE); 1759 max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr), 1760 PAGE_SIZE); 1761 max_num = (max_buf - sizeof(struct smb_hdr)) / 1762 sizeof(LOCKING_ANDX_RANGE); 1763 buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); 1764 if (!buf) { 1765 free_xid(xid); 1766 return -ENOMEM; 1767 } 1768 1769 for (i = 0; i < 2; i++) { 1770 cur = buf; 1771 num = 0; 1772 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { 1773 if (li->type != types[i]) 1774 continue; 1775 cur->Pid = cpu_to_le16(li->pid); 1776 cur->LengthLow = cpu_to_le32((u32)li->length); 1777 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); 1778 cur->OffsetLow = cpu_to_le32((u32)li->offset); 1779 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); 1780 if (++num == max_num) { 1781 stored_rc = cifs_lockv(xid, tcon, 1782 cfile->fid.netfid, 1783 (__u8)li->type, 0, num, 1784 buf); 1785 if (stored_rc) 1786 rc = stored_rc; 1787 cur = buf; 1788 num = 0; 1789 } else 1790 cur++; 1791 } 1792 1793 if (num) { 1794 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, 1795 (__u8)types[i], 0, num, buf); 1796 if (stored_rc) 1797 rc = stored_rc; 1798 } 1799 } 1800 1801 kfree(buf); 1802 free_xid(xid); 1803 return rc; 1804 } 1805 1806 static __u32 1807 hash_lockowner(fl_owner_t owner) 1808 { 1809 return cifs_lock_secret ^ hash32_ptr((const void *)owner); 1810 } 1811 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1812 1813 struct lock_to_push { 1814 struct list_head llist; 1815 __u64 offset; 1816 __u64 length; 1817 __u32 pid; 1818 __u16 netfid; 1819 __u8 type; 1820 }; 1821 1822 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1823 static int 1824 cifs_push_posix_locks(struct cifsFileInfo *cfile) 1825 { 1826 struct inode *inode = d_inode(cfile->dentry); 1827 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 1828 struct file_lock *flock; 1829 struct file_lock_context *flctx = locks_inode_context(inode); 1830 unsigned int count = 0, i; 1831 int rc = 0, xid, type; 1832 struct list_head locks_to_send, *el; 1833 struct lock_to_push *lck, *tmp; 1834 __u64 length; 1835 1836 xid = get_xid(); 1837 1838 if (!flctx) 1839 goto out; 1840 1841 spin_lock(&flctx->flc_lock); 1842 list_for_each(el, &flctx->flc_posix) { 1843 count++; 1844 } 1845 spin_unlock(&flctx->flc_lock); 1846 1847 INIT_LIST_HEAD(&locks_to_send); 1848 1849 /* 1850 * Allocating count locks is enough because no FL_POSIX locks can be 1851 * added to the list while we are holding cinode->lock_sem that 1852 * protects locking operations of this inode. 1853 */ 1854 for (i = 0; i < count; i++) { 1855 lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); 1856 if (!lck) { 1857 rc = -ENOMEM; 1858 goto err_out; 1859 } 1860 list_add_tail(&lck->llist, &locks_to_send); 1861 } 1862 1863 el = locks_to_send.next; 1864 spin_lock(&flctx->flc_lock); 1865 for_each_file_lock(flock, &flctx->flc_posix) { 1866 unsigned char ftype = flock->c.flc_type; 1867 1868 if (el == &locks_to_send) { 1869 /* 1870 * The list ended. We don't have enough allocated 1871 * structures - something is really wrong. 1872 */ 1873 cifs_dbg(VFS, "Can't push all brlocks!\n"); 1874 break; 1875 } 1876 length = cifs_flock_len(flock); 1877 if (ftype == F_RDLCK || ftype == F_SHLCK) 1878 type = CIFS_RDLCK; 1879 else 1880 type = CIFS_WRLCK; 1881 lck = list_entry(el, struct lock_to_push, llist); 1882 lck->pid = hash_lockowner(flock->c.flc_owner); 1883 lck->netfid = cfile->fid.netfid; 1884 lck->length = length; 1885 lck->type = type; 1886 lck->offset = flock->fl_start; 1887 } 1888 spin_unlock(&flctx->flc_lock); 1889 1890 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { 1891 int stored_rc; 1892 1893 stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, 1894 lck->offset, lck->length, NULL, 1895 lck->type, 0); 1896 if (stored_rc) 1897 rc = stored_rc; 1898 list_del(&lck->llist); 1899 kfree(lck); 1900 } 1901 1902 out: 1903 free_xid(xid); 1904 return rc; 1905 err_out: 1906 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { 1907 list_del(&lck->llist); 1908 kfree(lck); 1909 } 1910 goto out; 1911 } 1912 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1913 1914 static int 1915 cifs_push_locks(struct cifsFileInfo *cfile) 1916 { 1917 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 1918 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 1919 int rc = 0; 1920 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1921 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); 1922 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1923 1924 /* we are going to update can_cache_brlcks here - need a write access */ 1925 cifs_down_write(&cinode->lock_sem); 1926 if (!cinode->can_cache_brlcks) { 1927 up_write(&cinode->lock_sem); 1928 return rc; 1929 } 1930 1931 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1932 if (cap_unix(tcon->ses) && 1933 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && 1934 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) 1935 rc = cifs_push_posix_locks(cfile); 1936 else 1937 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1938 rc = tcon->ses->server->ops->push_mand_locks(cfile); 1939 1940 cinode->can_cache_brlcks = false; 1941 up_write(&cinode->lock_sem); 1942 return rc; 1943 } 1944 1945 static void 1946 cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, 1947 bool *wait_flag, struct TCP_Server_Info *server) 1948 { 1949 if (flock->c.flc_flags & FL_POSIX) 1950 cifs_dbg(FYI, "Posix\n"); 1951 if (flock->c.flc_flags & FL_FLOCK) 1952 cifs_dbg(FYI, "Flock\n"); 1953 if (flock->c.flc_flags & FL_SLEEP) { 1954 cifs_dbg(FYI, "Blocking lock\n"); 1955 *wait_flag = true; 1956 } 1957 if (flock->c.flc_flags & FL_ACCESS) 1958 cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); 1959 if (flock->c.flc_flags & FL_LEASE) 1960 cifs_dbg(FYI, "Lease on file - not implemented yet\n"); 1961 if (flock->c.flc_flags & 1962 (~(FL_POSIX | FL_FLOCK | FL_SLEEP | 1963 FL_ACCESS | FL_LEASE | FL_CLOSE | FL_OFDLCK))) 1964 cifs_dbg(FYI, "Unknown lock flags 0x%x\n", 1965 flock->c.flc_flags); 1966 1967 *type = server->vals->large_lock_type; 1968 if (lock_is_write(flock)) { 1969 cifs_dbg(FYI, "F_WRLCK\n"); 1970 *type |= server->vals->exclusive_lock_type; 1971 *lock = 1; 1972 } else if (lock_is_unlock(flock)) { 1973 cifs_dbg(FYI, "F_UNLCK\n"); 1974 *type |= server->vals->unlock_lock_type; 1975 *unlock = 1; 1976 /* Check if unlock includes more than one lock range */ 1977 } else if (lock_is_read(flock)) { 1978 cifs_dbg(FYI, "F_RDLCK\n"); 1979 *type |= server->vals->shared_lock_type; 1980 *lock = 1; 1981 } else if (flock->c.flc_type == F_EXLCK) { 1982 cifs_dbg(FYI, "F_EXLCK\n"); 1983 *type |= server->vals->exclusive_lock_type; 1984 *lock = 1; 1985 } else if (flock->c.flc_type == F_SHLCK) { 1986 cifs_dbg(FYI, "F_SHLCK\n"); 1987 *type |= server->vals->shared_lock_type; 1988 *lock = 1; 1989 } else 1990 cifs_dbg(FYI, "Unknown type of lock\n"); 1991 } 1992 1993 static int 1994 cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, 1995 bool wait_flag, bool posix_lck, unsigned int xid) 1996 { 1997 int rc = 0; 1998 __u64 length = cifs_flock_len(flock); 1999 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; 2000 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 2001 struct TCP_Server_Info *server = tcon->ses->server; 2002 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2003 __u16 netfid = cfile->fid.netfid; 2004 2005 if (posix_lck) { 2006 int posix_lock_type; 2007 2008 rc = cifs_posix_lock_test(file, flock); 2009 if (!rc) 2010 return rc; 2011 2012 if (type & server->vals->shared_lock_type) 2013 posix_lock_type = CIFS_RDLCK; 2014 else 2015 posix_lock_type = CIFS_WRLCK; 2016 rc = CIFSSMBPosixLock(xid, tcon, netfid, 2017 hash_lockowner(flock->c.flc_owner), 2018 flock->fl_start, length, flock, 2019 posix_lock_type, wait_flag); 2020 return rc; 2021 } 2022 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2023 2024 rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); 2025 if (!rc) 2026 return rc; 2027 2028 /* BB we could chain these into one lock request BB */ 2029 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, 2030 1, 0, false); 2031 if (rc == 0) { 2032 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, 2033 type, 0, 1, false); 2034 flock->c.flc_type = F_UNLCK; 2035 if (rc != 0) 2036 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", 2037 rc); 2038 return 0; 2039 } 2040 2041 if (type & server->vals->shared_lock_type) { 2042 flock->c.flc_type = F_WRLCK; 2043 return 0; 2044 } 2045 2046 type &= ~server->vals->exclusive_lock_type; 2047 2048 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, 2049 type | server->vals->shared_lock_type, 2050 1, 0, false); 2051 if (rc == 0) { 2052 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, 2053 type | server->vals->shared_lock_type, 0, 1, false); 2054 flock->c.flc_type = F_RDLCK; 2055 if (rc != 0) 2056 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", 2057 rc); 2058 } else 2059 flock->c.flc_type = F_WRLCK; 2060 2061 return 0; 2062 } 2063 2064 void 2065 cifs_move_llist(struct list_head *source, struct list_head *dest) 2066 { 2067 struct list_head *li, *tmp; 2068 list_for_each_safe(li, tmp, source) 2069 list_move(li, dest); 2070 } 2071 2072 void 2073 cifs_free_llist(struct list_head *llist) 2074 { 2075 struct cifsLockInfo *li, *tmp; 2076 list_for_each_entry_safe(li, tmp, llist, llist) { 2077 cifs_del_lock_waiters(li); 2078 list_del(&li->llist); 2079 kfree(li); 2080 } 2081 } 2082 2083 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2084 int 2085 cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, 2086 unsigned int xid) 2087 { 2088 int rc = 0, stored_rc; 2089 static const int types[] = { 2090 LOCKING_ANDX_LARGE_FILES, 2091 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES 2092 }; 2093 unsigned int i; 2094 unsigned int max_num, num, max_buf; 2095 LOCKING_ANDX_RANGE *buf, *cur; 2096 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 2097 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 2098 struct cifsLockInfo *li, *tmp; 2099 __u64 length = cifs_flock_len(flock); 2100 struct list_head tmp_llist; 2101 2102 INIT_LIST_HEAD(&tmp_llist); 2103 2104 /* 2105 * Accessing maxBuf is racy with cifs_reconnect - need to store value 2106 * and check it before using. 2107 */ 2108 max_buf = tcon->ses->server->maxBuf; 2109 if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) 2110 return -EINVAL; 2111 2112 BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) > 2113 PAGE_SIZE); 2114 max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr), 2115 PAGE_SIZE); 2116 max_num = (max_buf - sizeof(struct smb_hdr)) / 2117 sizeof(LOCKING_ANDX_RANGE); 2118 buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); 2119 if (!buf) 2120 return -ENOMEM; 2121 2122 cifs_down_write(&cinode->lock_sem); 2123 for (i = 0; i < 2; i++) { 2124 cur = buf; 2125 num = 0; 2126 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { 2127 if (flock->fl_start > li->offset || 2128 (flock->fl_start + length) < 2129 (li->offset + li->length)) 2130 continue; 2131 if (current->tgid != li->pid) 2132 continue; 2133 if (types[i] != li->type) 2134 continue; 2135 if (cinode->can_cache_brlcks) { 2136 /* 2137 * We can cache brlock requests - simply remove 2138 * a lock from the file's list. 2139 */ 2140 list_del(&li->llist); 2141 cifs_del_lock_waiters(li); 2142 kfree(li); 2143 continue; 2144 } 2145 cur->Pid = cpu_to_le16(li->pid); 2146 cur->LengthLow = cpu_to_le32((u32)li->length); 2147 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); 2148 cur->OffsetLow = cpu_to_le32((u32)li->offset); 2149 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); 2150 /* 2151 * We need to save a lock here to let us add it again to 2152 * the file's list if the unlock range request fails on 2153 * the server. 2154 */ 2155 list_move(&li->llist, &tmp_llist); 2156 if (++num == max_num) { 2157 stored_rc = cifs_lockv(xid, tcon, 2158 cfile->fid.netfid, 2159 li->type, num, 0, buf); 2160 if (stored_rc) { 2161 /* 2162 * We failed on the unlock range 2163 * request - add all locks from the tmp 2164 * list to the head of the file's list. 2165 */ 2166 cifs_move_llist(&tmp_llist, 2167 &cfile->llist->locks); 2168 rc = stored_rc; 2169 } else 2170 /* 2171 * The unlock range request succeed - 2172 * free the tmp list. 2173 */ 2174 cifs_free_llist(&tmp_llist); 2175 cur = buf; 2176 num = 0; 2177 } else 2178 cur++; 2179 } 2180 if (num) { 2181 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, 2182 types[i], num, 0, buf); 2183 if (stored_rc) { 2184 cifs_move_llist(&tmp_llist, 2185 &cfile->llist->locks); 2186 rc = stored_rc; 2187 } else 2188 cifs_free_llist(&tmp_llist); 2189 } 2190 } 2191 2192 up_write(&cinode->lock_sem); 2193 kfree(buf); 2194 return rc; 2195 } 2196 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2197 2198 static int 2199 cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, 2200 bool wait_flag, bool posix_lck, int lock, int unlock, 2201 unsigned int xid) 2202 { 2203 int rc = 0; 2204 __u64 length = cifs_flock_len(flock); 2205 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; 2206 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 2207 struct TCP_Server_Info *server = tcon->ses->server; 2208 struct inode *inode = d_inode(cfile->dentry); 2209 2210 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2211 if (posix_lck) { 2212 int posix_lock_type; 2213 2214 rc = cifs_posix_lock_set(file, flock); 2215 if (rc <= FILE_LOCK_DEFERRED) 2216 return rc; 2217 2218 if (type & server->vals->shared_lock_type) 2219 posix_lock_type = CIFS_RDLCK; 2220 else 2221 posix_lock_type = CIFS_WRLCK; 2222 2223 if (unlock == 1) 2224 posix_lock_type = CIFS_UNLCK; 2225 2226 rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, 2227 hash_lockowner(flock->c.flc_owner), 2228 flock->fl_start, length, 2229 NULL, posix_lock_type, wait_flag); 2230 goto out; 2231 } 2232 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2233 if (lock) { 2234 struct cifsLockInfo *lock; 2235 2236 lock = cifs_lock_init(flock->fl_start, length, type, 2237 flock->c.flc_flags); 2238 if (!lock) 2239 return -ENOMEM; 2240 2241 rc = cifs_lock_add_if(cfile, lock, wait_flag); 2242 if (rc < 0) { 2243 kfree(lock); 2244 return rc; 2245 } 2246 if (!rc) 2247 goto out; 2248 2249 /* 2250 * Windows 7 server can delay breaking lease from read to None 2251 * if we set a byte-range lock on a file - break it explicitly 2252 * before sending the lock to the server to be sure the next 2253 * read won't conflict with non-overlapted locks due to 2254 * pagereading. 2255 */ 2256 if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && 2257 CIFS_CACHE_READ(CIFS_I(inode))) { 2258 cifs_zap_mapping(inode); 2259 cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", 2260 inode); 2261 CIFS_I(inode)->oplock = 0; 2262 } 2263 2264 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, 2265 type, 1, 0, wait_flag); 2266 if (rc) { 2267 kfree(lock); 2268 return rc; 2269 } 2270 2271 cifs_lock_add(cfile, lock); 2272 } else if (unlock) 2273 rc = server->ops->mand_unlock_range(cfile, flock, xid); 2274 2275 out: 2276 if ((flock->c.flc_flags & FL_POSIX) || (flock->c.flc_flags & FL_FLOCK)) { 2277 /* 2278 * If this is a request to remove all locks because we 2279 * are closing the file, it doesn't matter if the 2280 * unlocking failed as both cifs.ko and the SMB server 2281 * remove the lock on file close 2282 */ 2283 if (rc) { 2284 cifs_dbg(VFS, "%s failed rc=%d\n", __func__, rc); 2285 if (!(flock->c.flc_flags & FL_CLOSE)) 2286 return rc; 2287 } 2288 rc = locks_lock_file_wait(file, flock); 2289 } 2290 return rc; 2291 } 2292 2293 int cifs_flock(struct file *file, int cmd, struct file_lock *fl) 2294 { 2295 int rc, xid; 2296 int lock = 0, unlock = 0; 2297 bool wait_flag = false; 2298 bool posix_lck = false; 2299 struct cifs_sb_info *cifs_sb; 2300 struct cifs_tcon *tcon; 2301 struct cifsFileInfo *cfile; 2302 __u32 type; 2303 2304 xid = get_xid(); 2305 2306 if (!(fl->c.flc_flags & FL_FLOCK)) { 2307 rc = -ENOLCK; 2308 free_xid(xid); 2309 return rc; 2310 } 2311 2312 cfile = (struct cifsFileInfo *)file->private_data; 2313 tcon = tlink_tcon(cfile->tlink); 2314 2315 cifs_read_flock(fl, &type, &lock, &unlock, &wait_flag, 2316 tcon->ses->server); 2317 cifs_sb = CIFS_FILE_SB(file); 2318 2319 if (cap_unix(tcon->ses) && 2320 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && 2321 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) 2322 posix_lck = true; 2323 2324 if (!lock && !unlock) { 2325 /* 2326 * if no lock or unlock then nothing to do since we do not 2327 * know what it is 2328 */ 2329 rc = -EOPNOTSUPP; 2330 free_xid(xid); 2331 return rc; 2332 } 2333 2334 rc = cifs_setlk(file, fl, type, wait_flag, posix_lck, lock, unlock, 2335 xid); 2336 free_xid(xid); 2337 return rc; 2338 2339 2340 } 2341 2342 int cifs_lock(struct file *file, int cmd, struct file_lock *flock) 2343 { 2344 int rc, xid; 2345 int lock = 0, unlock = 0; 2346 bool wait_flag = false; 2347 bool posix_lck = false; 2348 struct cifs_sb_info *cifs_sb; 2349 struct cifs_tcon *tcon; 2350 struct cifsFileInfo *cfile; 2351 __u32 type; 2352 2353 rc = -EACCES; 2354 xid = get_xid(); 2355 2356 cifs_dbg(FYI, "%s: %pD2 cmd=0x%x type=0x%x flags=0x%x r=%lld:%lld\n", __func__, file, cmd, 2357 flock->c.flc_flags, flock->c.flc_type, 2358 (long long)flock->fl_start, 2359 (long long)flock->fl_end); 2360 2361 cfile = (struct cifsFileInfo *)file->private_data; 2362 tcon = tlink_tcon(cfile->tlink); 2363 2364 cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, 2365 tcon->ses->server); 2366 cifs_sb = CIFS_FILE_SB(file); 2367 set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags); 2368 2369 if (cap_unix(tcon->ses) && 2370 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && 2371 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) 2372 posix_lck = true; 2373 /* 2374 * BB add code here to normalize offset and length to account for 2375 * negative length which we can not accept over the wire. 2376 */ 2377 if (IS_GETLK(cmd)) { 2378 rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); 2379 free_xid(xid); 2380 return rc; 2381 } 2382 2383 if (!lock && !unlock) { 2384 /* 2385 * if no lock or unlock then nothing to do since we do not 2386 * know what it is 2387 */ 2388 free_xid(xid); 2389 return -EOPNOTSUPP; 2390 } 2391 2392 rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, 2393 xid); 2394 free_xid(xid); 2395 return rc; 2396 } 2397 2398 void cifs_write_subrequest_terminated(struct cifs_io_subrequest *wdata, ssize_t result, 2399 bool was_async) 2400 { 2401 struct netfs_io_request *wreq = wdata->rreq; 2402 struct netfs_inode *ictx = netfs_inode(wreq->inode); 2403 loff_t wrend; 2404 2405 if (result > 0) { 2406 wrend = wdata->subreq.start + wdata->subreq.transferred + result; 2407 2408 if (wrend > ictx->zero_point && 2409 (wdata->rreq->origin == NETFS_UNBUFFERED_WRITE || 2410 wdata->rreq->origin == NETFS_DIO_WRITE)) 2411 ictx->zero_point = wrend; 2412 if (wrend > ictx->remote_i_size) 2413 netfs_resize_file(ictx, wrend, true); 2414 } 2415 2416 netfs_write_subrequest_terminated(&wdata->subreq, result, was_async); 2417 } 2418 2419 struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, 2420 bool fsuid_only) 2421 { 2422 struct cifsFileInfo *open_file = NULL; 2423 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb); 2424 2425 /* only filter by fsuid on multiuser mounts */ 2426 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) 2427 fsuid_only = false; 2428 2429 spin_lock(&cifs_inode->open_file_lock); 2430 /* we could simply get the first_list_entry since write-only entries 2431 are always at the end of the list but since the first entry might 2432 have a close pending, we go through the whole list */ 2433 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { 2434 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) 2435 continue; 2436 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { 2437 if ((!open_file->invalidHandle)) { 2438 /* found a good file */ 2439 /* lock it so it will not be closed on us */ 2440 cifsFileInfo_get(open_file); 2441 spin_unlock(&cifs_inode->open_file_lock); 2442 return open_file; 2443 } /* else might as well continue, and look for 2444 another, or simply have the caller reopen it 2445 again rather than trying to fix this handle */ 2446 } else /* write only file */ 2447 break; /* write only files are last so must be done */ 2448 } 2449 spin_unlock(&cifs_inode->open_file_lock); 2450 return NULL; 2451 } 2452 2453 /* Return -EBADF if no handle is found and general rc otherwise */ 2454 int 2455 cifs_get_writable_file(struct cifsInodeInfo *cifs_inode, int flags, 2456 struct cifsFileInfo **ret_file) 2457 { 2458 struct cifsFileInfo *open_file, *inv_file = NULL; 2459 struct cifs_sb_info *cifs_sb; 2460 bool any_available = false; 2461 int rc = -EBADF; 2462 unsigned int refind = 0; 2463 bool fsuid_only = flags & FIND_WR_FSUID_ONLY; 2464 bool with_delete = flags & FIND_WR_WITH_DELETE; 2465 *ret_file = NULL; 2466 2467 /* 2468 * Having a null inode here (because mapping->host was set to zero by 2469 * the VFS or MM) should not happen but we had reports of on oops (due 2470 * to it being zero) during stress testcases so we need to check for it 2471 */ 2472 2473 if (cifs_inode == NULL) { 2474 cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); 2475 dump_stack(); 2476 return rc; 2477 } 2478 2479 cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb); 2480 2481 /* only filter by fsuid on multiuser mounts */ 2482 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) 2483 fsuid_only = false; 2484 2485 spin_lock(&cifs_inode->open_file_lock); 2486 refind_writable: 2487 if (refind > MAX_REOPEN_ATT) { 2488 spin_unlock(&cifs_inode->open_file_lock); 2489 return rc; 2490 } 2491 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { 2492 if (!any_available && open_file->pid != current->tgid) 2493 continue; 2494 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) 2495 continue; 2496 if (with_delete && !(open_file->fid.access & DELETE)) 2497 continue; 2498 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { 2499 if (!open_file->invalidHandle) { 2500 /* found a good writable file */ 2501 cifsFileInfo_get(open_file); 2502 spin_unlock(&cifs_inode->open_file_lock); 2503 *ret_file = open_file; 2504 return 0; 2505 } else { 2506 if (!inv_file) 2507 inv_file = open_file; 2508 } 2509 } 2510 } 2511 /* couldn't find useable FH with same pid, try any available */ 2512 if (!any_available) { 2513 any_available = true; 2514 goto refind_writable; 2515 } 2516 2517 if (inv_file) { 2518 any_available = false; 2519 cifsFileInfo_get(inv_file); 2520 } 2521 2522 spin_unlock(&cifs_inode->open_file_lock); 2523 2524 if (inv_file) { 2525 rc = cifs_reopen_file(inv_file, false); 2526 if (!rc) { 2527 *ret_file = inv_file; 2528 return 0; 2529 } 2530 2531 spin_lock(&cifs_inode->open_file_lock); 2532 list_move_tail(&inv_file->flist, &cifs_inode->openFileList); 2533 spin_unlock(&cifs_inode->open_file_lock); 2534 cifsFileInfo_put(inv_file); 2535 ++refind; 2536 inv_file = NULL; 2537 spin_lock(&cifs_inode->open_file_lock); 2538 goto refind_writable; 2539 } 2540 2541 return rc; 2542 } 2543 2544 struct cifsFileInfo * 2545 find_writable_file(struct cifsInodeInfo *cifs_inode, int flags) 2546 { 2547 struct cifsFileInfo *cfile; 2548 int rc; 2549 2550 rc = cifs_get_writable_file(cifs_inode, flags, &cfile); 2551 if (rc) 2552 cifs_dbg(FYI, "Couldn't find writable handle rc=%d\n", rc); 2553 2554 return cfile; 2555 } 2556 2557 int 2558 cifs_get_writable_path(struct cifs_tcon *tcon, const char *name, 2559 int flags, 2560 struct cifsFileInfo **ret_file) 2561 { 2562 struct cifsFileInfo *cfile; 2563 void *page = alloc_dentry_path(); 2564 2565 *ret_file = NULL; 2566 2567 spin_lock(&tcon->open_file_lock); 2568 list_for_each_entry(cfile, &tcon->openFileList, tlist) { 2569 struct cifsInodeInfo *cinode; 2570 const char *full_path = build_path_from_dentry(cfile->dentry, page); 2571 if (IS_ERR(full_path)) { 2572 spin_unlock(&tcon->open_file_lock); 2573 free_dentry_path(page); 2574 return PTR_ERR(full_path); 2575 } 2576 if (strcmp(full_path, name)) 2577 continue; 2578 2579 cinode = CIFS_I(d_inode(cfile->dentry)); 2580 spin_unlock(&tcon->open_file_lock); 2581 free_dentry_path(page); 2582 return cifs_get_writable_file(cinode, flags, ret_file); 2583 } 2584 2585 spin_unlock(&tcon->open_file_lock); 2586 free_dentry_path(page); 2587 return -ENOENT; 2588 } 2589 2590 int 2591 cifs_get_readable_path(struct cifs_tcon *tcon, const char *name, 2592 struct cifsFileInfo **ret_file) 2593 { 2594 struct cifsFileInfo *cfile; 2595 void *page = alloc_dentry_path(); 2596 2597 *ret_file = NULL; 2598 2599 spin_lock(&tcon->open_file_lock); 2600 list_for_each_entry(cfile, &tcon->openFileList, tlist) { 2601 struct cifsInodeInfo *cinode; 2602 const char *full_path = build_path_from_dentry(cfile->dentry, page); 2603 if (IS_ERR(full_path)) { 2604 spin_unlock(&tcon->open_file_lock); 2605 free_dentry_path(page); 2606 return PTR_ERR(full_path); 2607 } 2608 if (strcmp(full_path, name)) 2609 continue; 2610 2611 cinode = CIFS_I(d_inode(cfile->dentry)); 2612 spin_unlock(&tcon->open_file_lock); 2613 free_dentry_path(page); 2614 *ret_file = find_readable_file(cinode, 0); 2615 return *ret_file ? 0 : -ENOENT; 2616 } 2617 2618 spin_unlock(&tcon->open_file_lock); 2619 free_dentry_path(page); 2620 return -ENOENT; 2621 } 2622 2623 /* 2624 * Flush data on a strict file. 2625 */ 2626 int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, 2627 int datasync) 2628 { 2629 unsigned int xid; 2630 int rc = 0; 2631 struct cifs_tcon *tcon; 2632 struct TCP_Server_Info *server; 2633 struct cifsFileInfo *smbfile = file->private_data; 2634 struct inode *inode = file_inode(file); 2635 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2636 2637 rc = file_write_and_wait_range(file, start, end); 2638 if (rc) { 2639 trace_cifs_fsync_err(inode->i_ino, rc); 2640 return rc; 2641 } 2642 2643 xid = get_xid(); 2644 2645 cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", 2646 file, datasync); 2647 2648 if (!CIFS_CACHE_READ(CIFS_I(inode))) { 2649 rc = cifs_zap_mapping(inode); 2650 if (rc) { 2651 cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); 2652 rc = 0; /* don't care about it in fsync */ 2653 } 2654 } 2655 2656 tcon = tlink_tcon(smbfile->tlink); 2657 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { 2658 server = tcon->ses->server; 2659 if (server->ops->flush == NULL) { 2660 rc = -ENOSYS; 2661 goto strict_fsync_exit; 2662 } 2663 2664 if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) { 2665 smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY); 2666 if (smbfile) { 2667 rc = server->ops->flush(xid, tcon, &smbfile->fid); 2668 cifsFileInfo_put(smbfile); 2669 } else 2670 cifs_dbg(FYI, "ignore fsync for file not open for write\n"); 2671 } else 2672 rc = server->ops->flush(xid, tcon, &smbfile->fid); 2673 } 2674 2675 strict_fsync_exit: 2676 free_xid(xid); 2677 return rc; 2678 } 2679 2680 /* 2681 * Flush data on a non-strict data. 2682 */ 2683 int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) 2684 { 2685 unsigned int xid; 2686 int rc = 0; 2687 struct cifs_tcon *tcon; 2688 struct TCP_Server_Info *server; 2689 struct cifsFileInfo *smbfile = file->private_data; 2690 struct inode *inode = file_inode(file); 2691 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); 2692 2693 rc = file_write_and_wait_range(file, start, end); 2694 if (rc) { 2695 trace_cifs_fsync_err(file_inode(file)->i_ino, rc); 2696 return rc; 2697 } 2698 2699 xid = get_xid(); 2700 2701 cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", 2702 file, datasync); 2703 2704 tcon = tlink_tcon(smbfile->tlink); 2705 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { 2706 server = tcon->ses->server; 2707 if (server->ops->flush == NULL) { 2708 rc = -ENOSYS; 2709 goto fsync_exit; 2710 } 2711 2712 if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) { 2713 smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY); 2714 if (smbfile) { 2715 rc = server->ops->flush(xid, tcon, &smbfile->fid); 2716 cifsFileInfo_put(smbfile); 2717 } else 2718 cifs_dbg(FYI, "ignore fsync for file not open for write\n"); 2719 } else 2720 rc = server->ops->flush(xid, tcon, &smbfile->fid); 2721 } 2722 2723 fsync_exit: 2724 free_xid(xid); 2725 return rc; 2726 } 2727 2728 /* 2729 * As file closes, flush all cached write data for this inode checking 2730 * for write behind errors. 2731 */ 2732 int cifs_flush(struct file *file, fl_owner_t id) 2733 { 2734 struct inode *inode = file_inode(file); 2735 int rc = 0; 2736 2737 if (file->f_mode & FMODE_WRITE) 2738 rc = filemap_write_and_wait(inode->i_mapping); 2739 2740 cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); 2741 if (rc) { 2742 /* get more nuanced writeback errors */ 2743 rc = filemap_check_wb_err(file->f_mapping, 0); 2744 trace_cifs_flush_err(inode->i_ino, rc); 2745 } 2746 return rc; 2747 } 2748 2749 static ssize_t 2750 cifs_writev(struct kiocb *iocb, struct iov_iter *from) 2751 { 2752 struct file *file = iocb->ki_filp; 2753 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; 2754 struct inode *inode = file->f_mapping->host; 2755 struct cifsInodeInfo *cinode = CIFS_I(inode); 2756 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; 2757 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2758 ssize_t rc; 2759 2760 rc = netfs_start_io_write(inode); 2761 if (rc < 0) 2762 return rc; 2763 2764 /* 2765 * We need to hold the sem to be sure nobody modifies lock list 2766 * with a brlock that prevents writing. 2767 */ 2768 down_read(&cinode->lock_sem); 2769 2770 rc = generic_write_checks(iocb, from); 2771 if (rc <= 0) 2772 goto out; 2773 2774 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) && 2775 (cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from), 2776 server->vals->exclusive_lock_type, 0, 2777 NULL, CIFS_WRITE_OP))) { 2778 rc = -EACCES; 2779 goto out; 2780 } 2781 2782 rc = netfs_buffered_write_iter_locked(iocb, from, NULL); 2783 2784 out: 2785 up_read(&cinode->lock_sem); 2786 netfs_end_io_write(inode); 2787 if (rc > 0) 2788 rc = generic_write_sync(iocb, rc); 2789 return rc; 2790 } 2791 2792 ssize_t 2793 cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) 2794 { 2795 struct inode *inode = file_inode(iocb->ki_filp); 2796 struct cifsInodeInfo *cinode = CIFS_I(inode); 2797 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2798 struct cifsFileInfo *cfile = (struct cifsFileInfo *) 2799 iocb->ki_filp->private_data; 2800 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 2801 ssize_t written; 2802 2803 written = cifs_get_writer(cinode); 2804 if (written) 2805 return written; 2806 2807 if (CIFS_CACHE_WRITE(cinode)) { 2808 if (cap_unix(tcon->ses) && 2809 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && 2810 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { 2811 written = netfs_file_write_iter(iocb, from); 2812 goto out; 2813 } 2814 written = cifs_writev(iocb, from); 2815 goto out; 2816 } 2817 /* 2818 * For non-oplocked files in strict cache mode we need to write the data 2819 * to the server exactly from the pos to pos+len-1 rather than flush all 2820 * affected pages because it may cause a error with mandatory locks on 2821 * these pages but not on the region from pos to ppos+len-1. 2822 */ 2823 written = netfs_file_write_iter(iocb, from); 2824 if (CIFS_CACHE_READ(cinode)) { 2825 /* 2826 * We have read level caching and we have just sent a write 2827 * request to the server thus making data in the cache stale. 2828 * Zap the cache and set oplock/lease level to NONE to avoid 2829 * reading stale data from the cache. All subsequent read 2830 * operations will read new data from the server. 2831 */ 2832 cifs_zap_mapping(inode); 2833 cifs_dbg(FYI, "Set Oplock/Lease to NONE for inode=%p after write\n", 2834 inode); 2835 cinode->oplock = 0; 2836 } 2837 out: 2838 cifs_put_writer(cinode); 2839 return written; 2840 } 2841 2842 ssize_t cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter) 2843 { 2844 ssize_t rc; 2845 struct inode *inode = file_inode(iocb->ki_filp); 2846 2847 if (iocb->ki_flags & IOCB_DIRECT) 2848 return netfs_unbuffered_read_iter(iocb, iter); 2849 2850 rc = cifs_revalidate_mapping(inode); 2851 if (rc) 2852 return rc; 2853 2854 return netfs_file_read_iter(iocb, iter); 2855 } 2856 2857 ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) 2858 { 2859 struct inode *inode = file_inode(iocb->ki_filp); 2860 struct cifsInodeInfo *cinode = CIFS_I(inode); 2861 ssize_t written; 2862 int rc; 2863 2864 if (iocb->ki_filp->f_flags & O_DIRECT) { 2865 written = netfs_unbuffered_write_iter(iocb, from); 2866 if (written > 0 && CIFS_CACHE_READ(cinode)) { 2867 cifs_zap_mapping(inode); 2868 cifs_dbg(FYI, 2869 "Set no oplock for inode=%p after a write operation\n", 2870 inode); 2871 cinode->oplock = 0; 2872 } 2873 return written; 2874 } 2875 2876 written = cifs_get_writer(cinode); 2877 if (written) 2878 return written; 2879 2880 written = netfs_file_write_iter(iocb, from); 2881 2882 if (!CIFS_CACHE_WRITE(CIFS_I(inode))) { 2883 rc = filemap_fdatawrite(inode->i_mapping); 2884 if (rc) 2885 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n", 2886 rc, inode); 2887 } 2888 2889 cifs_put_writer(cinode); 2890 return written; 2891 } 2892 2893 ssize_t 2894 cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) 2895 { 2896 struct inode *inode = file_inode(iocb->ki_filp); 2897 struct cifsInodeInfo *cinode = CIFS_I(inode); 2898 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2899 struct cifsFileInfo *cfile = (struct cifsFileInfo *) 2900 iocb->ki_filp->private_data; 2901 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 2902 int rc = -EACCES; 2903 2904 /* 2905 * In strict cache mode we need to read from the server all the time 2906 * if we don't have level II oplock because the server can delay mtime 2907 * change - so we can't make a decision about inode invalidating. 2908 * And we can also fail with pagereading if there are mandatory locks 2909 * on pages affected by this read but not on the region from pos to 2910 * pos+len-1. 2911 */ 2912 if (!CIFS_CACHE_READ(cinode)) 2913 return netfs_unbuffered_read_iter(iocb, to); 2914 2915 if (cap_unix(tcon->ses) && 2916 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && 2917 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { 2918 if (iocb->ki_flags & IOCB_DIRECT) 2919 return netfs_unbuffered_read_iter(iocb, to); 2920 return netfs_buffered_read_iter(iocb, to); 2921 } 2922 2923 /* 2924 * We need to hold the sem to be sure nobody modifies lock list 2925 * with a brlock that prevents reading. 2926 */ 2927 if (iocb->ki_flags & IOCB_DIRECT) { 2928 rc = netfs_start_io_direct(inode); 2929 if (rc < 0) 2930 goto out; 2931 rc = -EACCES; 2932 down_read(&cinode->lock_sem); 2933 if (!cifs_find_lock_conflict( 2934 cfile, iocb->ki_pos, iov_iter_count(to), 2935 tcon->ses->server->vals->shared_lock_type, 2936 0, NULL, CIFS_READ_OP)) 2937 rc = netfs_unbuffered_read_iter_locked(iocb, to); 2938 up_read(&cinode->lock_sem); 2939 netfs_end_io_direct(inode); 2940 } else { 2941 rc = netfs_start_io_read(inode); 2942 if (rc < 0) 2943 goto out; 2944 rc = -EACCES; 2945 down_read(&cinode->lock_sem); 2946 if (!cifs_find_lock_conflict( 2947 cfile, iocb->ki_pos, iov_iter_count(to), 2948 tcon->ses->server->vals->shared_lock_type, 2949 0, NULL, CIFS_READ_OP)) 2950 rc = filemap_read(iocb, to, 0); 2951 up_read(&cinode->lock_sem); 2952 netfs_end_io_read(inode); 2953 } 2954 out: 2955 return rc; 2956 } 2957 2958 static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf) 2959 { 2960 return netfs_page_mkwrite(vmf, NULL); 2961 } 2962 2963 static const struct vm_operations_struct cifs_file_vm_ops = { 2964 .fault = filemap_fault, 2965 .map_pages = filemap_map_pages, 2966 .page_mkwrite = cifs_page_mkwrite, 2967 }; 2968 2969 int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) 2970 { 2971 int xid, rc = 0; 2972 struct inode *inode = file_inode(file); 2973 2974 xid = get_xid(); 2975 2976 if (!CIFS_CACHE_READ(CIFS_I(inode))) 2977 rc = cifs_zap_mapping(inode); 2978 if (!rc) 2979 rc = generic_file_mmap(file, vma); 2980 if (!rc) 2981 vma->vm_ops = &cifs_file_vm_ops; 2982 2983 free_xid(xid); 2984 return rc; 2985 } 2986 2987 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) 2988 { 2989 int rc, xid; 2990 2991 xid = get_xid(); 2992 2993 rc = cifs_revalidate_file(file); 2994 if (rc) 2995 cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", 2996 rc); 2997 if (!rc) 2998 rc = generic_file_mmap(file, vma); 2999 if (!rc) 3000 vma->vm_ops = &cifs_file_vm_ops; 3001 3002 free_xid(xid); 3003 return rc; 3004 } 3005 3006 static int is_inode_writable(struct cifsInodeInfo *cifs_inode) 3007 { 3008 struct cifsFileInfo *open_file; 3009 3010 spin_lock(&cifs_inode->open_file_lock); 3011 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { 3012 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { 3013 spin_unlock(&cifs_inode->open_file_lock); 3014 return 1; 3015 } 3016 } 3017 spin_unlock(&cifs_inode->open_file_lock); 3018 return 0; 3019 } 3020 3021 /* We do not want to update the file size from server for inodes 3022 open for write - to avoid races with writepage extending 3023 the file - in the future we could consider allowing 3024 refreshing the inode only on increases in the file size 3025 but this is tricky to do without racing with writebehind 3026 page caching in the current Linux kernel design */ 3027 bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file, 3028 bool from_readdir) 3029 { 3030 if (!cifsInode) 3031 return true; 3032 3033 if (is_inode_writable(cifsInode) || 3034 ((cifsInode->oplock & CIFS_CACHE_RW_FLG) != 0 && from_readdir)) { 3035 /* This inode is open for write at least once */ 3036 struct cifs_sb_info *cifs_sb; 3037 3038 cifs_sb = CIFS_SB(cifsInode->netfs.inode.i_sb); 3039 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { 3040 /* since no page cache to corrupt on directio 3041 we can change size safely */ 3042 return true; 3043 } 3044 3045 if (i_size_read(&cifsInode->netfs.inode) < end_of_file) 3046 return true; 3047 3048 return false; 3049 } else 3050 return true; 3051 } 3052 3053 void cifs_oplock_break(struct work_struct *work) 3054 { 3055 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, 3056 oplock_break); 3057 struct inode *inode = d_inode(cfile->dentry); 3058 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 3059 struct cifsInodeInfo *cinode = CIFS_I(inode); 3060 struct cifs_tcon *tcon; 3061 struct TCP_Server_Info *server; 3062 struct tcon_link *tlink; 3063 int rc = 0; 3064 bool purge_cache = false, oplock_break_cancelled; 3065 __u64 persistent_fid, volatile_fid; 3066 __u16 net_fid; 3067 3068 wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, 3069 TASK_UNINTERRUPTIBLE); 3070 3071 tlink = cifs_sb_tlink(cifs_sb); 3072 if (IS_ERR(tlink)) 3073 goto out; 3074 tcon = tlink_tcon(tlink); 3075 server = tcon->ses->server; 3076 3077 server->ops->downgrade_oplock(server, cinode, cfile->oplock_level, 3078 cfile->oplock_epoch, &purge_cache); 3079 3080 if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && 3081 cifs_has_mand_locks(cinode)) { 3082 cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", 3083 inode); 3084 cinode->oplock = 0; 3085 } 3086 3087 if (inode && S_ISREG(inode->i_mode)) { 3088 if (CIFS_CACHE_READ(cinode)) 3089 break_lease(inode, O_RDONLY); 3090 else 3091 break_lease(inode, O_WRONLY); 3092 rc = filemap_fdatawrite(inode->i_mapping); 3093 if (!CIFS_CACHE_READ(cinode) || purge_cache) { 3094 rc = filemap_fdatawait(inode->i_mapping); 3095 mapping_set_error(inode->i_mapping, rc); 3096 cifs_zap_mapping(inode); 3097 } 3098 cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); 3099 if (CIFS_CACHE_WRITE(cinode)) 3100 goto oplock_break_ack; 3101 } 3102 3103 rc = cifs_push_locks(cfile); 3104 if (rc) 3105 cifs_dbg(VFS, "Push locks rc = %d\n", rc); 3106 3107 oplock_break_ack: 3108 /* 3109 * When oplock break is received and there are no active 3110 * file handles but cached, then schedule deferred close immediately. 3111 * So, new open will not use cached handle. 3112 */ 3113 3114 if (!CIFS_CACHE_HANDLE(cinode) && !list_empty(&cinode->deferred_closes)) 3115 cifs_close_deferred_file(cinode); 3116 3117 persistent_fid = cfile->fid.persistent_fid; 3118 volatile_fid = cfile->fid.volatile_fid; 3119 net_fid = cfile->fid.netfid; 3120 oplock_break_cancelled = cfile->oplock_break_cancelled; 3121 3122 _cifsFileInfo_put(cfile, false /* do not wait for ourself */, false); 3123 /* 3124 * MS-SMB2 3.2.5.19.1 and 3.2.5.19.2 (and MS-CIFS 3.2.5.42) do not require 3125 * an acknowledgment to be sent when the file has already been closed. 3126 */ 3127 spin_lock(&cinode->open_file_lock); 3128 /* check list empty since can race with kill_sb calling tree disconnect */ 3129 if (!oplock_break_cancelled && !list_empty(&cinode->openFileList)) { 3130 spin_unlock(&cinode->open_file_lock); 3131 rc = server->ops->oplock_response(tcon, persistent_fid, 3132 volatile_fid, net_fid, cinode); 3133 cifs_dbg(FYI, "Oplock release rc = %d\n", rc); 3134 } else 3135 spin_unlock(&cinode->open_file_lock); 3136 3137 cifs_put_tlink(tlink); 3138 out: 3139 cifs_done_oplock_break(cinode); 3140 } 3141 3142 static int cifs_swap_activate(struct swap_info_struct *sis, 3143 struct file *swap_file, sector_t *span) 3144 { 3145 struct cifsFileInfo *cfile = swap_file->private_data; 3146 struct inode *inode = swap_file->f_mapping->host; 3147 unsigned long blocks; 3148 long long isize; 3149 3150 cifs_dbg(FYI, "swap activate\n"); 3151 3152 if (!swap_file->f_mapping->a_ops->swap_rw) 3153 /* Cannot support swap */ 3154 return -EINVAL; 3155 3156 spin_lock(&inode->i_lock); 3157 blocks = inode->i_blocks; 3158 isize = inode->i_size; 3159 spin_unlock(&inode->i_lock); 3160 if (blocks*512 < isize) { 3161 pr_warn("swap activate: swapfile has holes\n"); 3162 return -EINVAL; 3163 } 3164 *span = sis->pages; 3165 3166 pr_warn_once("Swap support over SMB3 is experimental\n"); 3167 3168 /* 3169 * TODO: consider adding ACL (or documenting how) to prevent other 3170 * users (on this or other systems) from reading it 3171 */ 3172 3173 3174 /* TODO: add sk_set_memalloc(inet) or similar */ 3175 3176 if (cfile) 3177 cfile->swapfile = true; 3178 /* 3179 * TODO: Since file already open, we can't open with DENY_ALL here 3180 * but we could add call to grab a byte range lock to prevent others 3181 * from reading or writing the file 3182 */ 3183 3184 sis->flags |= SWP_FS_OPS; 3185 return add_swap_extent(sis, 0, sis->max, 0); 3186 } 3187 3188 static void cifs_swap_deactivate(struct file *file) 3189 { 3190 struct cifsFileInfo *cfile = file->private_data; 3191 3192 cifs_dbg(FYI, "swap deactivate\n"); 3193 3194 /* TODO: undo sk_set_memalloc(inet) will eventually be needed */ 3195 3196 if (cfile) 3197 cfile->swapfile = false; 3198 3199 /* do we need to unpin (or unlock) the file */ 3200 } 3201 3202 /** 3203 * cifs_swap_rw - SMB3 address space operation for swap I/O 3204 * @iocb: target I/O control block 3205 * @iter: I/O buffer 3206 * 3207 * Perform IO to the swap-file. This is much like direct IO. 3208 */ 3209 static int cifs_swap_rw(struct kiocb *iocb, struct iov_iter *iter) 3210 { 3211 ssize_t ret; 3212 3213 if (iov_iter_rw(iter) == READ) 3214 ret = netfs_unbuffered_read_iter_locked(iocb, iter); 3215 else 3216 ret = netfs_unbuffered_write_iter_locked(iocb, iter, NULL); 3217 if (ret < 0) 3218 return ret; 3219 return 0; 3220 } 3221 3222 const struct address_space_operations cifs_addr_ops = { 3223 .read_folio = netfs_read_folio, 3224 .readahead = netfs_readahead, 3225 .writepages = netfs_writepages, 3226 .dirty_folio = netfs_dirty_folio, 3227 .release_folio = netfs_release_folio, 3228 .direct_IO = noop_direct_IO, 3229 .invalidate_folio = netfs_invalidate_folio, 3230 .migrate_folio = filemap_migrate_folio, 3231 /* 3232 * TODO: investigate and if useful we could add an is_dirty_writeback 3233 * helper if needed 3234 */ 3235 .swap_activate = cifs_swap_activate, 3236 .swap_deactivate = cifs_swap_deactivate, 3237 .swap_rw = cifs_swap_rw, 3238 }; 3239 3240 /* 3241 * cifs_readahead requires the server to support a buffer large enough to 3242 * contain the header plus one complete page of data. Otherwise, we need 3243 * to leave cifs_readahead out of the address space operations. 3244 */ 3245 const struct address_space_operations cifs_addr_ops_smallbuf = { 3246 .read_folio = netfs_read_folio, 3247 .writepages = netfs_writepages, 3248 .dirty_folio = netfs_dirty_folio, 3249 .release_folio = netfs_release_folio, 3250 .invalidate_folio = netfs_invalidate_folio, 3251 .migrate_folio = filemap_migrate_folio, 3252 }; 3253