1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 4 * Copyright (C) 2019 Samsung Electronics Co., Ltd. 5 */ 6 7 #include <linux/fs.h> 8 #include <linux/filelock.h> 9 #include <linux/slab.h> 10 #include <linux/vmalloc.h> 11 12 #include "glob.h" 13 #include "vfs_cache.h" 14 #include "oplock.h" 15 #include "vfs.h" 16 #include "connection.h" 17 #include "mgmt/tree_connect.h" 18 #include "mgmt/user_session.h" 19 #include "smb_common.h" 20 21 #define S_DEL_PENDING 1 22 #define S_DEL_ON_CLS 2 23 #define S_DEL_ON_CLS_STREAM 8 24 25 static unsigned int inode_hash_mask __read_mostly; 26 static unsigned int inode_hash_shift __read_mostly; 27 static struct hlist_head *inode_hashtable __read_mostly; 28 static DEFINE_RWLOCK(inode_hash_lock); 29 30 static struct ksmbd_file_table global_ft; 31 static atomic_long_t fd_limit; 32 static struct kmem_cache *filp_cache; 33 34 void ksmbd_set_fd_limit(unsigned long limit) 35 { 36 limit = min(limit, get_max_files()); 37 atomic_long_set(&fd_limit, limit); 38 } 39 40 static bool fd_limit_depleted(void) 41 { 42 long v = atomic_long_dec_return(&fd_limit); 43 44 if (v >= 0) 45 return false; 46 atomic_long_inc(&fd_limit); 47 return true; 48 } 49 50 static void fd_limit_close(void) 51 { 52 atomic_long_inc(&fd_limit); 53 } 54 55 /* 56 * INODE hash 57 */ 58 59 static unsigned long inode_hash(struct super_block *sb, unsigned long hashval) 60 { 61 unsigned long tmp; 62 63 tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / 64 L1_CACHE_BYTES; 65 tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> inode_hash_shift); 66 return tmp & inode_hash_mask; 67 } 68 69 static struct ksmbd_inode *__ksmbd_inode_lookup(struct dentry *de) 70 { 71 struct hlist_head *head = inode_hashtable + 72 inode_hash(d_inode(de)->i_sb, (unsigned long)de); 73 struct ksmbd_inode *ci = NULL, *ret_ci = NULL; 74 75 hlist_for_each_entry(ci, head, m_hash) { 76 if (ci->m_de == de) { 77 if (atomic_inc_not_zero(&ci->m_count)) 78 ret_ci = ci; 79 break; 80 } 81 } 82 return ret_ci; 83 } 84 85 static struct ksmbd_inode *ksmbd_inode_lookup(struct ksmbd_file *fp) 86 { 87 return __ksmbd_inode_lookup(fp->filp->f_path.dentry); 88 } 89 90 struct ksmbd_inode *ksmbd_inode_lookup_lock(struct dentry *d) 91 { 92 struct ksmbd_inode *ci; 93 94 read_lock(&inode_hash_lock); 95 ci = __ksmbd_inode_lookup(d); 96 read_unlock(&inode_hash_lock); 97 98 return ci; 99 } 100 101 int ksmbd_query_inode_status(struct dentry *dentry) 102 { 103 struct ksmbd_inode *ci; 104 int ret = KSMBD_INODE_STATUS_UNKNOWN; 105 106 read_lock(&inode_hash_lock); 107 ci = __ksmbd_inode_lookup(dentry); 108 if (ci) { 109 ret = KSMBD_INODE_STATUS_OK; 110 if (ci->m_flags & (S_DEL_PENDING | S_DEL_ON_CLS)) 111 ret = KSMBD_INODE_STATUS_PENDING_DELETE; 112 atomic_dec(&ci->m_count); 113 } 114 read_unlock(&inode_hash_lock); 115 return ret; 116 } 117 118 bool ksmbd_inode_pending_delete(struct ksmbd_file *fp) 119 { 120 return (fp->f_ci->m_flags & (S_DEL_PENDING | S_DEL_ON_CLS)); 121 } 122 123 void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp) 124 { 125 fp->f_ci->m_flags |= S_DEL_PENDING; 126 } 127 128 void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp) 129 { 130 fp->f_ci->m_flags &= ~S_DEL_PENDING; 131 } 132 133 void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp, 134 int file_info) 135 { 136 if (ksmbd_stream_fd(fp)) { 137 fp->f_ci->m_flags |= S_DEL_ON_CLS_STREAM; 138 return; 139 } 140 141 fp->f_ci->m_flags |= S_DEL_ON_CLS; 142 } 143 144 static void ksmbd_inode_hash(struct ksmbd_inode *ci) 145 { 146 struct hlist_head *b = inode_hashtable + 147 inode_hash(d_inode(ci->m_de)->i_sb, (unsigned long)ci->m_de); 148 149 hlist_add_head(&ci->m_hash, b); 150 } 151 152 static void ksmbd_inode_unhash(struct ksmbd_inode *ci) 153 { 154 write_lock(&inode_hash_lock); 155 hlist_del_init(&ci->m_hash); 156 write_unlock(&inode_hash_lock); 157 } 158 159 static int ksmbd_inode_init(struct ksmbd_inode *ci, struct ksmbd_file *fp) 160 { 161 atomic_set(&ci->m_count, 1); 162 atomic_set(&ci->op_count, 0); 163 atomic_set(&ci->sop_count, 0); 164 ci->m_flags = 0; 165 ci->m_fattr = 0; 166 INIT_LIST_HEAD(&ci->m_fp_list); 167 INIT_LIST_HEAD(&ci->m_op_list); 168 init_rwsem(&ci->m_lock); 169 ci->m_de = fp->filp->f_path.dentry; 170 return 0; 171 } 172 173 static struct ksmbd_inode *ksmbd_inode_get(struct ksmbd_file *fp) 174 { 175 struct ksmbd_inode *ci, *tmpci; 176 int rc; 177 178 read_lock(&inode_hash_lock); 179 ci = ksmbd_inode_lookup(fp); 180 read_unlock(&inode_hash_lock); 181 if (ci) 182 return ci; 183 184 ci = kmalloc(sizeof(struct ksmbd_inode), GFP_KERNEL); 185 if (!ci) 186 return NULL; 187 188 rc = ksmbd_inode_init(ci, fp); 189 if (rc) { 190 pr_err("inode initialized failed\n"); 191 kfree(ci); 192 return NULL; 193 } 194 195 write_lock(&inode_hash_lock); 196 tmpci = ksmbd_inode_lookup(fp); 197 if (!tmpci) { 198 ksmbd_inode_hash(ci); 199 } else { 200 kfree(ci); 201 ci = tmpci; 202 } 203 write_unlock(&inode_hash_lock); 204 return ci; 205 } 206 207 static void ksmbd_inode_free(struct ksmbd_inode *ci) 208 { 209 ksmbd_inode_unhash(ci); 210 kfree(ci); 211 } 212 213 void ksmbd_inode_put(struct ksmbd_inode *ci) 214 { 215 if (atomic_dec_and_test(&ci->m_count)) 216 ksmbd_inode_free(ci); 217 } 218 219 int __init ksmbd_inode_hash_init(void) 220 { 221 unsigned int loop; 222 unsigned long numentries = 16384; 223 unsigned long bucketsize = sizeof(struct hlist_head); 224 unsigned long size; 225 226 inode_hash_shift = ilog2(numentries); 227 inode_hash_mask = (1 << inode_hash_shift) - 1; 228 229 size = bucketsize << inode_hash_shift; 230 231 /* init master fp hash table */ 232 inode_hashtable = vmalloc(size); 233 if (!inode_hashtable) 234 return -ENOMEM; 235 236 for (loop = 0; loop < (1U << inode_hash_shift); loop++) 237 INIT_HLIST_HEAD(&inode_hashtable[loop]); 238 return 0; 239 } 240 241 void ksmbd_release_inode_hash(void) 242 { 243 vfree(inode_hashtable); 244 } 245 246 static void __ksmbd_inode_close(struct ksmbd_file *fp) 247 { 248 struct ksmbd_inode *ci = fp->f_ci; 249 int err; 250 struct file *filp; 251 252 filp = fp->filp; 253 if (ksmbd_stream_fd(fp) && (ci->m_flags & S_DEL_ON_CLS_STREAM)) { 254 ci->m_flags &= ~S_DEL_ON_CLS_STREAM; 255 err = ksmbd_vfs_remove_xattr(file_mnt_idmap(filp), 256 &filp->f_path, 257 fp->stream.name); 258 if (err) 259 pr_err("remove xattr failed : %s\n", 260 fp->stream.name); 261 } 262 263 if (atomic_dec_and_test(&ci->m_count)) { 264 down_write(&ci->m_lock); 265 if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) { 266 ci->m_flags &= ~(S_DEL_ON_CLS | S_DEL_PENDING); 267 up_write(&ci->m_lock); 268 ksmbd_vfs_unlink(filp); 269 down_write(&ci->m_lock); 270 } 271 up_write(&ci->m_lock); 272 273 ksmbd_inode_free(ci); 274 } 275 } 276 277 static void __ksmbd_remove_durable_fd(struct ksmbd_file *fp) 278 { 279 if (!has_file_id(fp->persistent_id)) 280 return; 281 282 write_lock(&global_ft.lock); 283 idr_remove(global_ft.idr, fp->persistent_id); 284 write_unlock(&global_ft.lock); 285 } 286 287 static void __ksmbd_remove_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp) 288 { 289 if (!has_file_id(fp->volatile_id)) 290 return; 291 292 down_write(&fp->f_ci->m_lock); 293 list_del_init(&fp->node); 294 up_write(&fp->f_ci->m_lock); 295 296 write_lock(&ft->lock); 297 idr_remove(ft->idr, fp->volatile_id); 298 write_unlock(&ft->lock); 299 } 300 301 static void __ksmbd_close_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp) 302 { 303 struct file *filp; 304 struct ksmbd_lock *smb_lock, *tmp_lock; 305 306 fd_limit_close(); 307 __ksmbd_remove_durable_fd(fp); 308 if (ft) 309 __ksmbd_remove_fd(ft, fp); 310 311 close_id_del_oplock(fp); 312 filp = fp->filp; 313 314 __ksmbd_inode_close(fp); 315 if (!IS_ERR_OR_NULL(filp)) 316 fput(filp); 317 318 /* because the reference count of fp is 0, it is guaranteed that 319 * there are not accesses to fp->lock_list. 320 */ 321 list_for_each_entry_safe(smb_lock, tmp_lock, &fp->lock_list, flist) { 322 spin_lock(&fp->conn->llist_lock); 323 list_del(&smb_lock->clist); 324 spin_unlock(&fp->conn->llist_lock); 325 326 list_del(&smb_lock->flist); 327 locks_free_lock(smb_lock->fl); 328 kfree(smb_lock); 329 } 330 331 if (ksmbd_stream_fd(fp)) 332 kfree(fp->stream.name); 333 kmem_cache_free(filp_cache, fp); 334 } 335 336 static struct ksmbd_file *ksmbd_fp_get(struct ksmbd_file *fp) 337 { 338 if (fp->f_state != FP_INITED) 339 return NULL; 340 341 if (!atomic_inc_not_zero(&fp->refcount)) 342 return NULL; 343 return fp; 344 } 345 346 static struct ksmbd_file *__ksmbd_lookup_fd(struct ksmbd_file_table *ft, 347 u64 id) 348 { 349 struct ksmbd_file *fp; 350 351 if (!has_file_id(id)) 352 return NULL; 353 354 read_lock(&ft->lock); 355 fp = idr_find(ft->idr, id); 356 if (fp) 357 fp = ksmbd_fp_get(fp); 358 read_unlock(&ft->lock); 359 return fp; 360 } 361 362 static void __put_fd_final(struct ksmbd_work *work, struct ksmbd_file *fp) 363 { 364 __ksmbd_close_fd(&work->sess->file_table, fp); 365 atomic_dec(&work->conn->stats.open_files_count); 366 } 367 368 static void set_close_state_blocked_works(struct ksmbd_file *fp) 369 { 370 struct ksmbd_work *cancel_work; 371 372 spin_lock(&fp->f_lock); 373 list_for_each_entry(cancel_work, &fp->blocked_works, 374 fp_entry) { 375 cancel_work->state = KSMBD_WORK_CLOSED; 376 cancel_work->cancel_fn(cancel_work->cancel_argv); 377 } 378 spin_unlock(&fp->f_lock); 379 } 380 381 int ksmbd_close_fd(struct ksmbd_work *work, u64 id) 382 { 383 struct ksmbd_file *fp; 384 struct ksmbd_file_table *ft; 385 386 if (!has_file_id(id)) 387 return 0; 388 389 ft = &work->sess->file_table; 390 write_lock(&ft->lock); 391 fp = idr_find(ft->idr, id); 392 if (fp) { 393 set_close_state_blocked_works(fp); 394 395 if (fp->f_state != FP_INITED) 396 fp = NULL; 397 else { 398 fp->f_state = FP_CLOSED; 399 if (!atomic_dec_and_test(&fp->refcount)) 400 fp = NULL; 401 } 402 } 403 write_unlock(&ft->lock); 404 405 if (!fp) 406 return -EINVAL; 407 408 __put_fd_final(work, fp); 409 return 0; 410 } 411 412 void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp) 413 { 414 if (!fp) 415 return; 416 417 if (!atomic_dec_and_test(&fp->refcount)) 418 return; 419 __put_fd_final(work, fp); 420 } 421 422 static bool __sanity_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp) 423 { 424 if (!fp) 425 return false; 426 if (fp->tcon != tcon) 427 return false; 428 return true; 429 } 430 431 struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, u64 id) 432 { 433 return __ksmbd_lookup_fd(&work->sess->file_table, id); 434 } 435 436 struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work, u64 id) 437 { 438 struct ksmbd_file *fp = __ksmbd_lookup_fd(&work->sess->file_table, id); 439 440 if (__sanity_check(work->tcon, fp)) 441 return fp; 442 443 ksmbd_fd_put(work, fp); 444 return NULL; 445 } 446 447 struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id, 448 u64 pid) 449 { 450 struct ksmbd_file *fp; 451 452 if (!has_file_id(id)) { 453 id = work->compound_fid; 454 pid = work->compound_pfid; 455 } 456 457 fp = __ksmbd_lookup_fd(&work->sess->file_table, id); 458 if (!__sanity_check(work->tcon, fp)) { 459 ksmbd_fd_put(work, fp); 460 return NULL; 461 } 462 if (fp->persistent_id != pid) { 463 ksmbd_fd_put(work, fp); 464 return NULL; 465 } 466 return fp; 467 } 468 469 struct ksmbd_file *ksmbd_lookup_global_fd(unsigned long long id) 470 { 471 return __ksmbd_lookup_fd(&global_ft, id); 472 } 473 474 struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) 475 { 476 struct ksmbd_file *fp; 477 478 fp = __ksmbd_lookup_fd(&global_ft, id); 479 if (fp && fp->conn) { 480 ksmbd_put_durable_fd(fp); 481 fp = NULL; 482 } 483 484 return fp; 485 } 486 487 void ksmbd_put_durable_fd(struct ksmbd_file *fp) 488 { 489 if (!atomic_dec_and_test(&fp->refcount)) 490 return; 491 492 __ksmbd_close_fd(NULL, fp); 493 } 494 495 struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid) 496 { 497 struct ksmbd_file *fp = NULL; 498 unsigned int id; 499 500 read_lock(&global_ft.lock); 501 idr_for_each_entry(global_ft.idr, fp, id) { 502 if (!memcmp(fp->create_guid, 503 cguid, 504 SMB2_CREATE_GUID_SIZE)) { 505 fp = ksmbd_fp_get(fp); 506 break; 507 } 508 } 509 read_unlock(&global_ft.lock); 510 511 return fp; 512 } 513 514 struct ksmbd_file *ksmbd_lookup_fd_inode(struct dentry *dentry) 515 { 516 struct ksmbd_file *lfp; 517 struct ksmbd_inode *ci; 518 struct inode *inode = d_inode(dentry); 519 520 read_lock(&inode_hash_lock); 521 ci = __ksmbd_inode_lookup(dentry); 522 read_unlock(&inode_hash_lock); 523 if (!ci) 524 return NULL; 525 526 down_read(&ci->m_lock); 527 list_for_each_entry(lfp, &ci->m_fp_list, node) { 528 if (inode == file_inode(lfp->filp)) { 529 atomic_dec(&ci->m_count); 530 lfp = ksmbd_fp_get(lfp); 531 up_read(&ci->m_lock); 532 return lfp; 533 } 534 } 535 atomic_dec(&ci->m_count); 536 up_read(&ci->m_lock); 537 return NULL; 538 } 539 540 #define OPEN_ID_TYPE_VOLATILE_ID (0) 541 #define OPEN_ID_TYPE_PERSISTENT_ID (1) 542 543 static void __open_id_set(struct ksmbd_file *fp, u64 id, int type) 544 { 545 if (type == OPEN_ID_TYPE_VOLATILE_ID) 546 fp->volatile_id = id; 547 if (type == OPEN_ID_TYPE_PERSISTENT_ID) 548 fp->persistent_id = id; 549 } 550 551 static int __open_id(struct ksmbd_file_table *ft, struct ksmbd_file *fp, 552 int type) 553 { 554 u64 id = 0; 555 int ret; 556 557 if (type == OPEN_ID_TYPE_VOLATILE_ID && fd_limit_depleted()) { 558 __open_id_set(fp, KSMBD_NO_FID, type); 559 return -EMFILE; 560 } 561 562 idr_preload(GFP_KERNEL); 563 write_lock(&ft->lock); 564 ret = idr_alloc_cyclic(ft->idr, fp, 0, INT_MAX - 1, GFP_NOWAIT); 565 if (ret >= 0) { 566 id = ret; 567 ret = 0; 568 } else { 569 id = KSMBD_NO_FID; 570 fd_limit_close(); 571 } 572 573 __open_id_set(fp, id, type); 574 write_unlock(&ft->lock); 575 idr_preload_end(); 576 return ret; 577 } 578 579 unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp) 580 { 581 __open_id(&global_ft, fp, OPEN_ID_TYPE_PERSISTENT_ID); 582 return fp->persistent_id; 583 } 584 585 struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work, struct file *filp) 586 { 587 struct ksmbd_file *fp; 588 int ret; 589 590 fp = kmem_cache_zalloc(filp_cache, GFP_KERNEL); 591 if (!fp) { 592 pr_err("Failed to allocate memory\n"); 593 return ERR_PTR(-ENOMEM); 594 } 595 596 INIT_LIST_HEAD(&fp->blocked_works); 597 INIT_LIST_HEAD(&fp->node); 598 INIT_LIST_HEAD(&fp->lock_list); 599 spin_lock_init(&fp->f_lock); 600 atomic_set(&fp->refcount, 1); 601 602 fp->filp = filp; 603 fp->conn = work->conn; 604 fp->tcon = work->tcon; 605 fp->volatile_id = KSMBD_NO_FID; 606 fp->persistent_id = KSMBD_NO_FID; 607 fp->f_state = FP_NEW; 608 fp->f_ci = ksmbd_inode_get(fp); 609 610 if (!fp->f_ci) { 611 ret = -ENOMEM; 612 goto err_out; 613 } 614 615 ret = __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); 616 if (ret) { 617 ksmbd_inode_put(fp->f_ci); 618 goto err_out; 619 } 620 621 atomic_inc(&work->conn->stats.open_files_count); 622 return fp; 623 624 err_out: 625 kmem_cache_free(filp_cache, fp); 626 return ERR_PTR(ret); 627 } 628 629 void ksmbd_update_fstate(struct ksmbd_file_table *ft, struct ksmbd_file *fp, 630 unsigned int state) 631 { 632 if (!fp) 633 return; 634 635 write_lock(&ft->lock); 636 fp->f_state = state; 637 write_unlock(&ft->lock); 638 } 639 640 static int 641 __close_file_table_ids(struct ksmbd_file_table *ft, 642 struct ksmbd_tree_connect *tcon, 643 bool (*skip)(struct ksmbd_tree_connect *tcon, 644 struct ksmbd_file *fp)) 645 { 646 unsigned int id; 647 struct ksmbd_file *fp; 648 int num = 0; 649 650 idr_for_each_entry(ft->idr, fp, id) { 651 if (skip(tcon, fp)) 652 continue; 653 654 set_close_state_blocked_works(fp); 655 656 if (!atomic_dec_and_test(&fp->refcount)) 657 continue; 658 __ksmbd_close_fd(ft, fp); 659 num++; 660 } 661 return num; 662 } 663 664 static inline bool is_reconnectable(struct ksmbd_file *fp) 665 { 666 struct oplock_info *opinfo = opinfo_get(fp); 667 bool reconn = false; 668 669 if (!opinfo) 670 return false; 671 672 if (opinfo->op_state != OPLOCK_STATE_NONE) { 673 opinfo_put(opinfo); 674 return false; 675 } 676 677 if (fp->is_resilient || fp->is_persistent) 678 reconn = true; 679 else if (fp->is_durable && opinfo->is_lease && 680 opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 681 reconn = true; 682 683 else if (fp->is_durable && opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) 684 reconn = true; 685 686 opinfo_put(opinfo); 687 return reconn; 688 } 689 690 static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, 691 struct ksmbd_file *fp) 692 { 693 return fp->tcon != tcon; 694 } 695 696 static bool session_fd_check(struct ksmbd_tree_connect *tcon, 697 struct ksmbd_file *fp) 698 { 699 struct ksmbd_inode *ci; 700 struct oplock_info *op; 701 struct ksmbd_conn *conn; 702 703 if (!is_reconnectable(fp)) 704 return false; 705 706 conn = fp->conn; 707 ci = fp->f_ci; 708 down_write(&ci->m_lock); 709 list_for_each_entry_rcu(op, &ci->m_op_list, op_entry) { 710 if (op->conn != conn) 711 continue; 712 op->conn = NULL; 713 } 714 up_write(&ci->m_lock); 715 716 fp->conn = NULL; 717 fp->tcon = NULL; 718 fp->volatile_id = KSMBD_NO_FID; 719 720 return true; 721 } 722 723 void ksmbd_close_tree_conn_fds(struct ksmbd_work *work) 724 { 725 int num = __close_file_table_ids(&work->sess->file_table, 726 work->tcon, 727 tree_conn_fd_check); 728 729 atomic_sub(num, &work->conn->stats.open_files_count); 730 } 731 732 void ksmbd_close_session_fds(struct ksmbd_work *work) 733 { 734 int num = __close_file_table_ids(&work->sess->file_table, 735 work->tcon, 736 session_fd_check); 737 738 atomic_sub(num, &work->conn->stats.open_files_count); 739 } 740 741 int ksmbd_init_global_file_table(void) 742 { 743 return ksmbd_init_file_table(&global_ft); 744 } 745 746 void ksmbd_free_global_file_table(void) 747 { 748 struct ksmbd_file *fp = NULL; 749 unsigned int id; 750 751 idr_for_each_entry(global_ft.idr, fp, id) { 752 __ksmbd_remove_durable_fd(fp); 753 kmem_cache_free(filp_cache, fp); 754 } 755 756 ksmbd_destroy_file_table(&global_ft); 757 } 758 759 int ksmbd_validate_name_reconnect(struct ksmbd_share_config *share, 760 struct ksmbd_file *fp, char *name) 761 { 762 char *pathname, *ab_pathname; 763 int ret = 0; 764 765 pathname = kmalloc(PATH_MAX, GFP_KERNEL); 766 if (!pathname) 767 return -EACCES; 768 769 ab_pathname = d_path(&fp->filp->f_path, pathname, PATH_MAX); 770 if (IS_ERR(ab_pathname)) { 771 kfree(pathname); 772 return -EACCES; 773 } 774 775 if (name && strcmp(&ab_pathname[share->path_sz + 1], name)) { 776 ksmbd_debug(SMB, "invalid name reconnect %s\n", name); 777 ret = -EINVAL; 778 } 779 780 kfree(pathname); 781 782 return ret; 783 } 784 785 int ksmbd_reopen_durable_fd(struct ksmbd_work *work, struct ksmbd_file *fp) 786 { 787 struct ksmbd_inode *ci; 788 struct oplock_info *op; 789 790 if (!fp->is_durable || fp->conn || fp->tcon) { 791 pr_err("Invalid durable fd [%p:%p]\n", fp->conn, fp->tcon); 792 return -EBADF; 793 } 794 795 if (has_file_id(fp->volatile_id)) { 796 pr_err("Still in use durable fd: %llu\n", fp->volatile_id); 797 return -EBADF; 798 } 799 800 fp->conn = work->conn; 801 fp->tcon = work->tcon; 802 803 ci = fp->f_ci; 804 down_write(&ci->m_lock); 805 list_for_each_entry_rcu(op, &ci->m_op_list, op_entry) { 806 if (op->conn) 807 continue; 808 op->conn = fp->conn; 809 } 810 up_write(&ci->m_lock); 811 812 __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); 813 if (!has_file_id(fp->volatile_id)) { 814 fp->conn = NULL; 815 fp->tcon = NULL; 816 return -EBADF; 817 } 818 return 0; 819 } 820 821 int ksmbd_init_file_table(struct ksmbd_file_table *ft) 822 { 823 ft->idr = kzalloc(sizeof(struct idr), GFP_KERNEL); 824 if (!ft->idr) 825 return -ENOMEM; 826 827 idr_init(ft->idr); 828 rwlock_init(&ft->lock); 829 return 0; 830 } 831 832 void ksmbd_destroy_file_table(struct ksmbd_file_table *ft) 833 { 834 if (!ft->idr) 835 return; 836 837 __close_file_table_ids(ft, NULL, session_fd_check); 838 idr_destroy(ft->idr); 839 kfree(ft->idr); 840 ft->idr = NULL; 841 } 842 843 int ksmbd_init_file_cache(void) 844 { 845 filp_cache = kmem_cache_create("ksmbd_file_cache", 846 sizeof(struct ksmbd_file), 0, 847 SLAB_HWCACHE_ALIGN, NULL); 848 if (!filp_cache) 849 goto out; 850 851 return 0; 852 853 out: 854 pr_err("failed to allocate file cache\n"); 855 return -ENOMEM; 856 } 857 858 void ksmbd_exit_file_cache(void) 859 { 860 kmem_cache_destroy(filp_cache); 861 } 862