1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2008 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * 7 * Common Internet FileSystem (CIFS) client 8 * 9 */ 10 11 /* Note that BB means BUGBUG (ie something to fix eventually) */ 12 13 #include <linux/module.h> 14 #include <linux/fs.h> 15 #include <linux/filelock.h> 16 #include <linux/mount.h> 17 #include <linux/slab.h> 18 #include <linux/init.h> 19 #include <linux/list.h> 20 #include <linux/seq_file.h> 21 #include <linux/vfs.h> 22 #include <linux/mempool.h> 23 #include <linux/delay.h> 24 #include <linux/kthread.h> 25 #include <linux/freezer.h> 26 #include <linux/namei.h> 27 #include <linux/random.h> 28 #include <linux/splice.h> 29 #include <linux/uuid.h> 30 #include <linux/xattr.h> 31 #include <uapi/linux/magic.h> 32 #include <net/ipv6.h> 33 #include "cifsfs.h" 34 #include "cifspdu.h" 35 #define DECLARE_GLOBALS_HERE 36 #include "cifsglob.h" 37 #include "cifsproto.h" 38 #include "cifs_debug.h" 39 #include "cifs_fs_sb.h" 40 #include <linux/mm.h> 41 #include <linux/key-type.h> 42 #include "cifs_spnego.h" 43 #include "fscache.h" 44 #ifdef CONFIG_CIFS_DFS_UPCALL 45 #include "dfs_cache.h" 46 #endif 47 #ifdef CONFIG_CIFS_SWN_UPCALL 48 #include "netlink.h" 49 #endif 50 #include "fs_context.h" 51 #include "cached_dir.h" 52 53 /* 54 * DOS dates from 1980/1/1 through 2107/12/31 55 * Protocol specifications indicate the range should be to 119, which 56 * limits maximum year to 2099. But this range has not been checked. 57 */ 58 #define SMB_DATE_MAX (127<<9 | 12<<5 | 31) 59 #define SMB_DATE_MIN (0<<9 | 1<<5 | 1) 60 #define SMB_TIME_MAX (23<<11 | 59<<5 | 29) 61 62 int cifsFYI = 0; 63 bool traceSMB; 64 bool enable_oplocks = true; 65 bool linuxExtEnabled = true; 66 bool lookupCacheEnabled = true; 67 bool disable_legacy_dialects; /* false by default */ 68 bool enable_gcm_256 = true; 69 bool require_gcm_256; /* false by default */ 70 bool enable_negotiate_signing; /* false by default */ 71 unsigned int global_secflags = CIFSSEC_DEF; 72 /* unsigned int ntlmv2_support = 0; */ 73 74 /* 75 * Global transaction id (XID) information 76 */ 77 unsigned int GlobalCurrentXid; /* protected by GlobalMid_Lock */ 78 unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */ 79 unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Lock */ 80 spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 81 82 /* 83 * Global counters, updated atomically 84 */ 85 atomic_t sesInfoAllocCount; 86 atomic_t tconInfoAllocCount; 87 atomic_t tcpSesNextId; 88 atomic_t tcpSesAllocCount; 89 atomic_t tcpSesReconnectCount; 90 atomic_t tconInfoReconnectCount; 91 92 atomic_t mid_count; 93 atomic_t buf_alloc_count; 94 atomic_t small_buf_alloc_count; 95 #ifdef CONFIG_CIFS_STATS2 96 atomic_t total_buf_alloc_count; 97 atomic_t total_small_buf_alloc_count; 98 #endif/* STATS2 */ 99 struct list_head cifs_tcp_ses_list; 100 spinlock_t cifs_tcp_ses_lock; 101 static const struct super_operations cifs_super_ops; 102 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE; 103 module_param(CIFSMaxBufSize, uint, 0444); 104 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) " 105 "for CIFS requests. " 106 "Default: 16384 Range: 8192 to 130048"); 107 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL; 108 module_param(cifs_min_rcv, uint, 0444); 109 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: " 110 "1 to 64"); 111 unsigned int cifs_min_small = 30; 112 module_param(cifs_min_small, uint, 0444); 113 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 " 114 "Range: 2 to 256"); 115 unsigned int cifs_max_pending = CIFS_MAX_REQ; 116 module_param(cifs_max_pending, uint, 0444); 117 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for " 118 "CIFS/SMB1 dialect (N/A for SMB3) " 119 "Default: 32767 Range: 2 to 32767."); 120 unsigned int dir_cache_timeout = 30; 121 module_param(dir_cache_timeout, uint, 0644); 122 MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 " 123 "Range: 1 to 65000 seconds, 0 to disable caching dir contents"); 124 #ifdef CONFIG_CIFS_STATS2 125 unsigned int slow_rsp_threshold = 1; 126 module_param(slow_rsp_threshold, uint, 0644); 127 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait " 128 "before logging that a response is delayed. " 129 "Default: 1 (if set to 0 disables msg)."); 130 #endif /* STATS2 */ 131 132 module_param(enable_oplocks, bool, 0644); 133 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1"); 134 135 module_param(enable_gcm_256, bool, 0644); 136 MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: y/Y/0"); 137 138 module_param(require_gcm_256, bool, 0644); 139 MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0"); 140 141 module_param(enable_negotiate_signing, bool, 0644); 142 MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0"); 143 144 module_param(disable_legacy_dialects, bool, 0644); 145 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be " 146 "helpful to restrict the ability to " 147 "override the default dialects (SMB2.1, " 148 "SMB3 and SMB3.02) on mount with old " 149 "dialects (CIFS/SMB1 and SMB2) since " 150 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker" 151 " and less secure. Default: n/N/0"); 152 153 struct workqueue_struct *cifsiod_wq; 154 struct workqueue_struct *decrypt_wq; 155 struct workqueue_struct *fileinfo_put_wq; 156 struct workqueue_struct *cifsoplockd_wq; 157 struct workqueue_struct *deferredclose_wq; 158 struct workqueue_struct *serverclose_wq; 159 struct workqueue_struct *cfid_put_wq; 160 __u32 cifs_lock_secret; 161 162 /* 163 * Bumps refcount for cifs super block. 164 * Note that it should be only called if a reference to VFS super block is 165 * already held, e.g. in open-type syscalls context. Otherwise it can race with 166 * atomic_dec_and_test in deactivate_locked_super. 167 */ 168 void 169 cifs_sb_active(struct super_block *sb) 170 { 171 struct cifs_sb_info *server = CIFS_SB(sb); 172 173 if (atomic_inc_return(&server->active) == 1) 174 atomic_inc(&sb->s_active); 175 } 176 177 void 178 cifs_sb_deactive(struct super_block *sb) 179 { 180 struct cifs_sb_info *server = CIFS_SB(sb); 181 182 if (atomic_dec_and_test(&server->active)) 183 deactivate_super(sb); 184 } 185 186 static int 187 cifs_read_super(struct super_block *sb) 188 { 189 struct inode *inode; 190 struct cifs_sb_info *cifs_sb; 191 struct cifs_tcon *tcon; 192 struct timespec64 ts; 193 int rc = 0; 194 195 cifs_sb = CIFS_SB(sb); 196 tcon = cifs_sb_master_tcon(cifs_sb); 197 198 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL) 199 sb->s_flags |= SB_POSIXACL; 200 201 if (tcon->snapshot_time) 202 sb->s_flags |= SB_RDONLY; 203 204 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files) 205 sb->s_maxbytes = MAX_LFS_FILESIZE; 206 else 207 sb->s_maxbytes = MAX_NON_LFS; 208 209 /* 210 * Some very old servers like DOS and OS/2 used 2 second granularity 211 * (while all current servers use 100ns granularity - see MS-DTYP) 212 * but 1 second is the maximum allowed granularity for the VFS 213 * so for old servers set time granularity to 1 second while for 214 * everything else (current servers) set it to 100ns. 215 */ 216 if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) && 217 ((tcon->ses->capabilities & 218 tcon->ses->server->vals->cap_nt_find) == 0) && 219 !tcon->unix_ext) { 220 sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */ 221 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0); 222 sb->s_time_min = ts.tv_sec; 223 ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX), 224 cpu_to_le16(SMB_TIME_MAX), 0); 225 sb->s_time_max = ts.tv_sec; 226 } else { 227 /* 228 * Almost every server, including all SMB2+, uses DCE TIME 229 * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC 230 */ 231 sb->s_time_gran = 100; 232 ts = cifs_NTtimeToUnix(0); 233 sb->s_time_min = ts.tv_sec; 234 ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX)); 235 sb->s_time_max = ts.tv_sec; 236 } 237 238 sb->s_magic = CIFS_SUPER_MAGIC; 239 sb->s_op = &cifs_super_ops; 240 sb->s_xattr = cifs_xattr_handlers; 241 rc = super_setup_bdi(sb); 242 if (rc) 243 goto out_no_root; 244 /* tune readahead according to rsize if readahead size not set on mount */ 245 if (cifs_sb->ctx->rsize == 0) 246 cifs_sb->ctx->rsize = 247 tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx); 248 if (cifs_sb->ctx->rasize) 249 sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE; 250 else 251 sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE); 252 253 sb->s_blocksize = CIFS_MAX_MSGSIZE; 254 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */ 255 inode = cifs_root_iget(sb); 256 257 if (IS_ERR(inode)) { 258 rc = PTR_ERR(inode); 259 goto out_no_root; 260 } 261 262 if (tcon->nocase) 263 sb->s_d_op = &cifs_ci_dentry_ops; 264 else 265 sb->s_d_op = &cifs_dentry_ops; 266 267 sb->s_root = d_make_root(inode); 268 if (!sb->s_root) { 269 rc = -ENOMEM; 270 goto out_no_root; 271 } 272 273 #ifdef CONFIG_CIFS_NFSD_EXPORT 274 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { 275 cifs_dbg(FYI, "export ops supported\n"); 276 sb->s_export_op = &cifs_export_ops; 277 } 278 #endif /* CONFIG_CIFS_NFSD_EXPORT */ 279 280 return 0; 281 282 out_no_root: 283 cifs_dbg(VFS, "%s: get root inode failed\n", __func__); 284 return rc; 285 } 286 287 static void cifs_kill_sb(struct super_block *sb) 288 { 289 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 290 291 /* 292 * We need to release all dentries for the cached directories 293 * before we kill the sb. 294 */ 295 if (cifs_sb->root) { 296 close_all_cached_dirs(cifs_sb); 297 298 /* finally release root dentry */ 299 dput(cifs_sb->root); 300 cifs_sb->root = NULL; 301 } 302 303 kill_anon_super(sb); 304 cifs_umount(cifs_sb); 305 } 306 307 static int 308 cifs_statfs(struct dentry *dentry, struct kstatfs *buf) 309 { 310 struct super_block *sb = dentry->d_sb; 311 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 312 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 313 struct TCP_Server_Info *server = tcon->ses->server; 314 unsigned int xid; 315 int rc = 0; 316 const char *full_path; 317 void *page; 318 319 xid = get_xid(); 320 page = alloc_dentry_path(); 321 322 full_path = build_path_from_dentry(dentry, page); 323 if (IS_ERR(full_path)) { 324 rc = PTR_ERR(full_path); 325 goto statfs_out; 326 } 327 328 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0) 329 buf->f_namelen = 330 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); 331 else 332 buf->f_namelen = PATH_MAX; 333 334 buf->f_fsid.val[0] = tcon->vol_serial_number; 335 /* are using part of create time for more randomness, see man statfs */ 336 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time); 337 338 buf->f_files = 0; /* undefined */ 339 buf->f_ffree = 0; /* unlimited */ 340 341 if (server->ops->queryfs) 342 rc = server->ops->queryfs(xid, tcon, full_path, cifs_sb, buf); 343 344 statfs_out: 345 free_dentry_path(page); 346 free_xid(xid); 347 return rc; 348 } 349 350 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len) 351 { 352 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); 353 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 354 struct TCP_Server_Info *server = tcon->ses->server; 355 356 if (server->ops->fallocate) 357 return server->ops->fallocate(file, tcon, mode, off, len); 358 359 return -EOPNOTSUPP; 360 } 361 362 static int cifs_permission(struct mnt_idmap *idmap, 363 struct inode *inode, int mask) 364 { 365 struct cifs_sb_info *cifs_sb; 366 367 cifs_sb = CIFS_SB(inode->i_sb); 368 369 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) { 370 if ((mask & MAY_EXEC) && !execute_ok(inode)) 371 return -EACCES; 372 else 373 return 0; 374 } else /* file mode might have been restricted at mount time 375 on the client (above and beyond ACL on servers) for 376 servers which do not support setting and viewing mode bits, 377 so allowing client to check permissions is useful */ 378 return generic_permission(&nop_mnt_idmap, inode, mask); 379 } 380 381 static struct kmem_cache *cifs_inode_cachep; 382 static struct kmem_cache *cifs_req_cachep; 383 static struct kmem_cache *cifs_mid_cachep; 384 static struct kmem_cache *cifs_sm_req_cachep; 385 static struct kmem_cache *cifs_io_request_cachep; 386 static struct kmem_cache *cifs_io_subrequest_cachep; 387 mempool_t *cifs_sm_req_poolp; 388 mempool_t *cifs_req_poolp; 389 mempool_t *cifs_mid_poolp; 390 mempool_t cifs_io_request_pool; 391 mempool_t cifs_io_subrequest_pool; 392 393 static struct inode * 394 cifs_alloc_inode(struct super_block *sb) 395 { 396 struct cifsInodeInfo *cifs_inode; 397 cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL); 398 if (!cifs_inode) 399 return NULL; 400 cifs_inode->cifsAttrs = ATTR_ARCHIVE; /* default */ 401 cifs_inode->time = 0; 402 /* 403 * Until the file is open and we have gotten oplock info back from the 404 * server, can not assume caching of file data or metadata. 405 */ 406 cifs_set_oplock_level(cifs_inode, 0); 407 cifs_inode->lease_granted = false; 408 cifs_inode->flags = 0; 409 spin_lock_init(&cifs_inode->writers_lock); 410 cifs_inode->writers = 0; 411 cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ 412 cifs_inode->netfs.remote_i_size = 0; 413 cifs_inode->uniqueid = 0; 414 cifs_inode->createtime = 0; 415 cifs_inode->epoch = 0; 416 spin_lock_init(&cifs_inode->open_file_lock); 417 generate_random_uuid(cifs_inode->lease_key); 418 cifs_inode->symlink_target = NULL; 419 420 /* 421 * Can not set i_flags here - they get immediately overwritten to zero 422 * by the VFS. 423 */ 424 /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */ 425 INIT_LIST_HEAD(&cifs_inode->openFileList); 426 INIT_LIST_HEAD(&cifs_inode->llist); 427 INIT_LIST_HEAD(&cifs_inode->deferred_closes); 428 spin_lock_init(&cifs_inode->deferred_lock); 429 return &cifs_inode->netfs.inode; 430 } 431 432 static void 433 cifs_free_inode(struct inode *inode) 434 { 435 struct cifsInodeInfo *cinode = CIFS_I(inode); 436 437 if (S_ISLNK(inode->i_mode)) 438 kfree(cinode->symlink_target); 439 kmem_cache_free(cifs_inode_cachep, cinode); 440 } 441 442 static void 443 cifs_evict_inode(struct inode *inode) 444 { 445 netfs_wait_for_outstanding_io(inode); 446 truncate_inode_pages_final(&inode->i_data); 447 if (inode->i_state & I_PINNING_NETFS_WB) 448 cifs_fscache_unuse_inode_cookie(inode, true); 449 cifs_fscache_release_inode_cookie(inode); 450 clear_inode(inode); 451 } 452 453 static void 454 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server) 455 { 456 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr; 457 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr; 458 459 seq_puts(s, ",addr="); 460 461 switch (server->dstaddr.ss_family) { 462 case AF_INET: 463 seq_printf(s, "%pI4", &sa->sin_addr.s_addr); 464 break; 465 case AF_INET6: 466 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr); 467 if (sa6->sin6_scope_id) 468 seq_printf(s, "%%%u", sa6->sin6_scope_id); 469 break; 470 default: 471 seq_puts(s, "(unknown)"); 472 } 473 if (server->rdma) 474 seq_puts(s, ",rdma"); 475 } 476 477 static void 478 cifs_show_security(struct seq_file *s, struct cifs_ses *ses) 479 { 480 if (ses->sectype == Unspecified) { 481 if (ses->user_name == NULL) 482 seq_puts(s, ",sec=none"); 483 return; 484 } 485 486 seq_puts(s, ",sec="); 487 488 switch (ses->sectype) { 489 case NTLMv2: 490 seq_puts(s, "ntlmv2"); 491 break; 492 case Kerberos: 493 seq_puts(s, "krb5"); 494 break; 495 case RawNTLMSSP: 496 seq_puts(s, "ntlmssp"); 497 break; 498 default: 499 /* shouldn't ever happen */ 500 seq_puts(s, "unknown"); 501 break; 502 } 503 504 if (ses->sign) 505 seq_puts(s, "i"); 506 507 if (ses->sectype == Kerberos) 508 seq_printf(s, ",cruid=%u", 509 from_kuid_munged(&init_user_ns, ses->cred_uid)); 510 } 511 512 static void 513 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb) 514 { 515 seq_puts(s, ",cache="); 516 517 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) 518 seq_puts(s, "strict"); 519 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) 520 seq_puts(s, "none"); 521 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE) 522 seq_puts(s, "singleclient"); /* assume only one client access */ 523 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) 524 seq_puts(s, "ro"); /* read only caching assumed */ 525 else 526 seq_puts(s, "loose"); 527 } 528 529 /* 530 * cifs_show_devname() is used so we show the mount device name with correct 531 * format (e.g. forward slashes vs. back slashes) in /proc/mounts 532 */ 533 static int cifs_show_devname(struct seq_file *m, struct dentry *root) 534 { 535 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); 536 char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL); 537 538 if (devname == NULL) 539 seq_puts(m, "none"); 540 else { 541 convert_delimiter(devname, '/'); 542 /* escape all spaces in share names */ 543 seq_escape(m, devname, " \t"); 544 kfree(devname); 545 } 546 return 0; 547 } 548 549 static void 550 cifs_show_upcall_target(struct seq_file *s, struct cifs_sb_info *cifs_sb) 551 { 552 if (cifs_sb->ctx->upcall_target == UPTARGET_UNSPECIFIED) { 553 seq_puts(s, ",upcall_target=app"); 554 return; 555 } 556 557 seq_puts(s, ",upcall_target="); 558 559 switch (cifs_sb->ctx->upcall_target) { 560 case UPTARGET_APP: 561 seq_puts(s, "app"); 562 break; 563 case UPTARGET_MOUNT: 564 seq_puts(s, "mount"); 565 break; 566 default: 567 /* shouldn't ever happen */ 568 seq_puts(s, "unknown"); 569 break; 570 } 571 } 572 573 /* 574 * cifs_show_options() is for displaying mount options in /proc/mounts. 575 * Not all settable options are displayed but most of the important 576 * ones are. 577 */ 578 static int 579 cifs_show_options(struct seq_file *s, struct dentry *root) 580 { 581 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); 582 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 583 struct sockaddr *srcaddr; 584 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr; 585 586 seq_show_option(s, "vers", tcon->ses->server->vals->version_string); 587 cifs_show_security(s, tcon->ses); 588 cifs_show_cache_flavor(s, cifs_sb); 589 cifs_show_upcall_target(s, cifs_sb); 590 591 if (tcon->no_lease) 592 seq_puts(s, ",nolease"); 593 if (cifs_sb->ctx->multiuser) 594 seq_puts(s, ",multiuser"); 595 else if (tcon->ses->user_name) 596 seq_show_option(s, "username", tcon->ses->user_name); 597 598 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0) 599 seq_show_option(s, "domain", tcon->ses->domainName); 600 601 if (srcaddr->sa_family != AF_UNSPEC) { 602 struct sockaddr_in *saddr4; 603 struct sockaddr_in6 *saddr6; 604 saddr4 = (struct sockaddr_in *)srcaddr; 605 saddr6 = (struct sockaddr_in6 *)srcaddr; 606 if (srcaddr->sa_family == AF_INET6) 607 seq_printf(s, ",srcaddr=%pI6c", 608 &saddr6->sin6_addr); 609 else if (srcaddr->sa_family == AF_INET) 610 seq_printf(s, ",srcaddr=%pI4", 611 &saddr4->sin_addr.s_addr); 612 else 613 seq_printf(s, ",srcaddr=BAD-AF:%i", 614 (int)(srcaddr->sa_family)); 615 } 616 617 seq_printf(s, ",uid=%u", 618 from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid)); 619 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) 620 seq_puts(s, ",forceuid"); 621 else 622 seq_puts(s, ",noforceuid"); 623 624 seq_printf(s, ",gid=%u", 625 from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid)); 626 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) 627 seq_puts(s, ",forcegid"); 628 else 629 seq_puts(s, ",noforcegid"); 630 631 cifs_show_address(s, tcon->ses->server); 632 633 if (!tcon->unix_ext) 634 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho", 635 cifs_sb->ctx->file_mode, 636 cifs_sb->ctx->dir_mode); 637 if (cifs_sb->ctx->iocharset) 638 seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset); 639 if (tcon->ses->unicode == 0) 640 seq_puts(s, ",nounicode"); 641 else if (tcon->ses->unicode == 1) 642 seq_puts(s, ",unicode"); 643 if (tcon->seal) 644 seq_puts(s, ",seal"); 645 else if (tcon->ses->server->ignore_signature) 646 seq_puts(s, ",signloosely"); 647 if (tcon->nocase) 648 seq_puts(s, ",nocase"); 649 if (tcon->nodelete) 650 seq_puts(s, ",nodelete"); 651 if (cifs_sb->ctx->no_sparse) 652 seq_puts(s, ",nosparse"); 653 if (tcon->local_lease) 654 seq_puts(s, ",locallease"); 655 if (tcon->retry) 656 seq_puts(s, ",hard"); 657 else 658 seq_puts(s, ",soft"); 659 if (tcon->use_persistent) 660 seq_puts(s, ",persistenthandles"); 661 else if (tcon->use_resilient) 662 seq_puts(s, ",resilienthandles"); 663 if (tcon->posix_extensions) 664 seq_puts(s, ",posix"); 665 else if (tcon->unix_ext) 666 seq_puts(s, ",unix"); 667 else 668 seq_puts(s, ",nounix"); 669 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) 670 seq_puts(s, ",nodfs"); 671 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 672 seq_puts(s, ",posixpaths"); 673 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) 674 seq_puts(s, ",setuids"); 675 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) 676 seq_puts(s, ",idsfromsid"); 677 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) 678 seq_puts(s, ",serverino"); 679 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) 680 seq_puts(s, ",rwpidforward"); 681 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) 682 seq_puts(s, ",forcemand"); 683 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) 684 seq_puts(s, ",nouser_xattr"); 685 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) 686 seq_puts(s, ",mapchars"); 687 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) 688 seq_puts(s, ",mapposix"); 689 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) 690 seq_puts(s, ",sfu"); 691 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) 692 seq_puts(s, ",nobrl"); 693 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE) 694 seq_puts(s, ",nohandlecache"); 695 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) 696 seq_puts(s, ",modefromsid"); 697 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) 698 seq_puts(s, ",cifsacl"); 699 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) 700 seq_puts(s, ",dynperm"); 701 if (root->d_sb->s_flags & SB_POSIXACL) 702 seq_puts(s, ",acl"); 703 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) 704 seq_puts(s, ",mfsymlinks"); 705 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) 706 seq_puts(s, ",fsc"); 707 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC) 708 seq_puts(s, ",nostrictsync"); 709 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) 710 seq_puts(s, ",noperm"); 711 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) 712 seq_printf(s, ",backupuid=%u", 713 from_kuid_munged(&init_user_ns, 714 cifs_sb->ctx->backupuid)); 715 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) 716 seq_printf(s, ",backupgid=%u", 717 from_kgid_munged(&init_user_ns, 718 cifs_sb->ctx->backupgid)); 719 seq_show_option(s, "reparse", 720 cifs_reparse_type_str(cifs_sb->ctx->reparse_type)); 721 if (cifs_sb->ctx->nonativesocket) 722 seq_puts(s, ",nonativesocket"); 723 else 724 seq_puts(s, ",nativesocket"); 725 seq_show_option(s, "symlink", 726 cifs_symlink_type_str(get_cifs_symlink_type(cifs_sb))); 727 728 seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize); 729 seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize); 730 seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize); 731 if (cifs_sb->ctx->rasize) 732 seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize); 733 if (tcon->ses->server->min_offload) 734 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload); 735 if (tcon->ses->server->retrans) 736 seq_printf(s, ",retrans=%u", tcon->ses->server->retrans); 737 seq_printf(s, ",echo_interval=%lu", 738 tcon->ses->server->echo_interval / HZ); 739 740 /* Only display the following if overridden on mount */ 741 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE) 742 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits); 743 if (tcon->ses->server->tcp_nodelay) 744 seq_puts(s, ",tcpnodelay"); 745 if (tcon->ses->server->noautotune) 746 seq_puts(s, ",noautotune"); 747 if (tcon->ses->server->noblocksnd) 748 seq_puts(s, ",noblocksend"); 749 if (tcon->ses->server->nosharesock) 750 seq_puts(s, ",nosharesock"); 751 752 if (tcon->snapshot_time) 753 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time); 754 if (tcon->handle_timeout) 755 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout); 756 if (tcon->max_cached_dirs != MAX_CACHED_FIDS) 757 seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs); 758 759 /* 760 * Display file and directory attribute timeout in seconds. 761 * If file and directory attribute timeout the same then actimeo 762 * was likely specified on mount 763 */ 764 if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax) 765 seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ); 766 else { 767 seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ); 768 seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ); 769 } 770 seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ); 771 772 if (tcon->ses->chan_max > 1) 773 seq_printf(s, ",multichannel,max_channels=%zu", 774 tcon->ses->chan_max); 775 776 if (tcon->use_witness) 777 seq_puts(s, ",witness"); 778 779 return 0; 780 } 781 782 static void cifs_umount_begin(struct super_block *sb) 783 { 784 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 785 struct cifs_tcon *tcon; 786 787 if (cifs_sb == NULL) 788 return; 789 790 tcon = cifs_sb_master_tcon(cifs_sb); 791 792 spin_lock(&cifs_tcp_ses_lock); 793 spin_lock(&tcon->tc_lock); 794 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count, 795 netfs_trace_tcon_ref_see_umount); 796 if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) { 797 /* we have other mounts to same share or we have 798 already tried to umount this and woken up 799 all waiting network requests, nothing to do */ 800 spin_unlock(&tcon->tc_lock); 801 spin_unlock(&cifs_tcp_ses_lock); 802 return; 803 } 804 /* 805 * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will 806 * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent 807 */ 808 spin_unlock(&tcon->tc_lock); 809 spin_unlock(&cifs_tcp_ses_lock); 810 811 cifs_close_all_deferred_files(tcon); 812 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */ 813 /* cancel_notify_requests(tcon); */ 814 if (tcon->ses && tcon->ses->server) { 815 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n"); 816 wake_up_all(&tcon->ses->server->request_q); 817 wake_up_all(&tcon->ses->server->response_q); 818 msleep(1); /* yield */ 819 /* we have to kick the requests once more */ 820 wake_up_all(&tcon->ses->server->response_q); 821 msleep(1); 822 } 823 824 return; 825 } 826 827 static int cifs_freeze(struct super_block *sb) 828 { 829 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 830 struct cifs_tcon *tcon; 831 832 if (cifs_sb == NULL) 833 return 0; 834 835 tcon = cifs_sb_master_tcon(cifs_sb); 836 837 cifs_close_all_deferred_files(tcon); 838 return 0; 839 } 840 841 #ifdef CONFIG_CIFS_STATS2 842 static int cifs_show_stats(struct seq_file *s, struct dentry *root) 843 { 844 /* BB FIXME */ 845 return 0; 846 } 847 #endif 848 849 static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc) 850 { 851 return netfs_unpin_writeback(inode, wbc); 852 } 853 854 static int cifs_drop_inode(struct inode *inode) 855 { 856 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 857 858 /* no serverino => unconditional eviction */ 859 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) || 860 generic_drop_inode(inode); 861 } 862 863 static const struct super_operations cifs_super_ops = { 864 .statfs = cifs_statfs, 865 .alloc_inode = cifs_alloc_inode, 866 .write_inode = cifs_write_inode, 867 .free_inode = cifs_free_inode, 868 .drop_inode = cifs_drop_inode, 869 .evict_inode = cifs_evict_inode, 870 /* .show_path = cifs_show_path, */ /* Would we ever need show path? */ 871 .show_devname = cifs_show_devname, 872 /* .delete_inode = cifs_delete_inode, */ /* Do not need above 873 function unless later we add lazy close of inodes or unless the 874 kernel forgets to call us with the same number of releases (closes) 875 as opens */ 876 .show_options = cifs_show_options, 877 .umount_begin = cifs_umount_begin, 878 .freeze_fs = cifs_freeze, 879 #ifdef CONFIG_CIFS_STATS2 880 .show_stats = cifs_show_stats, 881 #endif 882 }; 883 884 /* 885 * Get root dentry from superblock according to prefix path mount option. 886 * Return dentry with refcount + 1 on success and NULL otherwise. 887 */ 888 static struct dentry * 889 cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb) 890 { 891 struct dentry *dentry; 892 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 893 char *full_path = NULL; 894 char *s, *p; 895 char sep; 896 897 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) 898 return dget(sb->s_root); 899 900 full_path = cifs_build_path_to_root(ctx, cifs_sb, 901 cifs_sb_master_tcon(cifs_sb), 0); 902 if (full_path == NULL) 903 return ERR_PTR(-ENOMEM); 904 905 cifs_dbg(FYI, "Get root dentry for %s\n", full_path); 906 907 sep = CIFS_DIR_SEP(cifs_sb); 908 dentry = dget(sb->s_root); 909 s = full_path; 910 911 do { 912 struct inode *dir = d_inode(dentry); 913 struct dentry *child; 914 915 if (!S_ISDIR(dir->i_mode)) { 916 dput(dentry); 917 dentry = ERR_PTR(-ENOTDIR); 918 break; 919 } 920 921 /* skip separators */ 922 while (*s == sep) 923 s++; 924 if (!*s) 925 break; 926 p = s++; 927 /* next separator */ 928 while (*s && *s != sep) 929 s++; 930 931 child = lookup_noperm_positive_unlocked(&QSTR_LEN(p, s - p), 932 dentry); 933 dput(dentry); 934 dentry = child; 935 } while (!IS_ERR(dentry)); 936 kfree(full_path); 937 return dentry; 938 } 939 940 static int cifs_set_super(struct super_block *sb, void *data) 941 { 942 struct cifs_mnt_data *mnt_data = data; 943 sb->s_fs_info = mnt_data->cifs_sb; 944 return set_anon_super(sb, NULL); 945 } 946 947 struct dentry * 948 cifs_smb3_do_mount(struct file_system_type *fs_type, 949 int flags, struct smb3_fs_context *old_ctx) 950 { 951 struct cifs_mnt_data mnt_data; 952 struct cifs_sb_info *cifs_sb; 953 struct super_block *sb; 954 struct dentry *root; 955 int rc; 956 957 if (cifsFYI) { 958 cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__, 959 old_ctx->source, flags); 960 } else { 961 cifs_info("Attempting to mount %s\n", old_ctx->source); 962 } 963 964 cifs_sb = kzalloc(sizeof(*cifs_sb), GFP_KERNEL); 965 if (!cifs_sb) 966 return ERR_PTR(-ENOMEM); 967 968 cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL); 969 if (!cifs_sb->ctx) { 970 root = ERR_PTR(-ENOMEM); 971 goto out; 972 } 973 rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx); 974 if (rc) { 975 root = ERR_PTR(rc); 976 goto out; 977 } 978 979 rc = cifs_setup_cifs_sb(cifs_sb); 980 if (rc) { 981 root = ERR_PTR(rc); 982 goto out; 983 } 984 985 rc = cifs_mount(cifs_sb, cifs_sb->ctx); 986 if (rc) { 987 if (!(flags & SB_SILENT)) 988 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n", 989 rc); 990 root = ERR_PTR(rc); 991 goto out; 992 } 993 994 mnt_data.ctx = cifs_sb->ctx; 995 mnt_data.cifs_sb = cifs_sb; 996 mnt_data.flags = flags; 997 998 /* BB should we make this contingent on mount parm? */ 999 flags |= SB_NODIRATIME | SB_NOATIME; 1000 1001 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data); 1002 if (IS_ERR(sb)) { 1003 cifs_umount(cifs_sb); 1004 return ERR_CAST(sb); 1005 } 1006 1007 if (sb->s_root) { 1008 cifs_dbg(FYI, "Use existing superblock\n"); 1009 cifs_umount(cifs_sb); 1010 cifs_sb = NULL; 1011 } else { 1012 rc = cifs_read_super(sb); 1013 if (rc) { 1014 root = ERR_PTR(rc); 1015 goto out_super; 1016 } 1017 1018 sb->s_flags |= SB_ACTIVE; 1019 } 1020 1021 root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb); 1022 if (IS_ERR(root)) 1023 goto out_super; 1024 1025 if (cifs_sb) 1026 cifs_sb->root = dget(root); 1027 1028 cifs_dbg(FYI, "dentry root is: %p\n", root); 1029 return root; 1030 1031 out_super: 1032 deactivate_locked_super(sb); 1033 return root; 1034 out: 1035 kfree(cifs_sb->prepath); 1036 smb3_cleanup_fs_context(cifs_sb->ctx); 1037 kfree(cifs_sb); 1038 return root; 1039 } 1040 1041 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence) 1042 { 1043 struct cifsFileInfo *cfile = file->private_data; 1044 struct cifs_tcon *tcon; 1045 1046 /* 1047 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate 1048 * the cached file length 1049 */ 1050 if (whence != SEEK_SET && whence != SEEK_CUR) { 1051 int rc; 1052 struct inode *inode = file_inode(file); 1053 1054 /* 1055 * We need to be sure that all dirty pages are written and the 1056 * server has the newest file length. 1057 */ 1058 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping && 1059 inode->i_mapping->nrpages != 0) { 1060 rc = filemap_fdatawait(inode->i_mapping); 1061 if (rc) { 1062 mapping_set_error(inode->i_mapping, rc); 1063 return rc; 1064 } 1065 } 1066 /* 1067 * Some applications poll for the file length in this strange 1068 * way so we must seek to end on non-oplocked files by 1069 * setting the revalidate time to zero. 1070 */ 1071 CIFS_I(inode)->time = 0; 1072 1073 rc = cifs_revalidate_file_attr(file); 1074 if (rc < 0) 1075 return (loff_t)rc; 1076 } 1077 if (cfile && cfile->tlink) { 1078 tcon = tlink_tcon(cfile->tlink); 1079 if (tcon->ses->server->ops->llseek) 1080 return tcon->ses->server->ops->llseek(file, tcon, 1081 offset, whence); 1082 } 1083 return generic_file_llseek(file, offset, whence); 1084 } 1085 1086 static int 1087 cifs_setlease(struct file *file, int arg, struct file_lease **lease, void **priv) 1088 { 1089 /* 1090 * Note that this is called by vfs setlease with i_lock held to 1091 * protect *lease from going away. 1092 */ 1093 struct inode *inode = file_inode(file); 1094 struct cifsFileInfo *cfile = file->private_data; 1095 1096 /* Check if file is oplocked if this is request for new lease */ 1097 if (arg == F_UNLCK || 1098 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) || 1099 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode)))) 1100 return generic_setlease(file, arg, lease, priv); 1101 else if (tlink_tcon(cfile->tlink)->local_lease && 1102 !CIFS_CACHE_READ(CIFS_I(inode))) 1103 /* 1104 * If the server claims to support oplock on this file, then we 1105 * still need to check oplock even if the local_lease mount 1106 * option is set, but there are servers which do not support 1107 * oplock for which this mount option may be useful if the user 1108 * knows that the file won't be changed on the server by anyone 1109 * else. 1110 */ 1111 return generic_setlease(file, arg, lease, priv); 1112 else 1113 return -EAGAIN; 1114 } 1115 1116 struct file_system_type cifs_fs_type = { 1117 .owner = THIS_MODULE, 1118 .name = "cifs", 1119 .init_fs_context = smb3_init_fs_context, 1120 .parameters = smb3_fs_parameters, 1121 .kill_sb = cifs_kill_sb, 1122 .fs_flags = FS_RENAME_DOES_D_MOVE, 1123 }; 1124 MODULE_ALIAS_FS("cifs"); 1125 1126 struct file_system_type smb3_fs_type = { 1127 .owner = THIS_MODULE, 1128 .name = "smb3", 1129 .init_fs_context = smb3_init_fs_context, 1130 .parameters = smb3_fs_parameters, 1131 .kill_sb = cifs_kill_sb, 1132 .fs_flags = FS_RENAME_DOES_D_MOVE, 1133 }; 1134 MODULE_ALIAS_FS("smb3"); 1135 MODULE_ALIAS("smb3"); 1136 1137 const struct inode_operations cifs_dir_inode_ops = { 1138 .create = cifs_create, 1139 .atomic_open = cifs_atomic_open, 1140 .lookup = cifs_lookup, 1141 .getattr = cifs_getattr, 1142 .unlink = cifs_unlink, 1143 .link = cifs_hardlink, 1144 .mkdir = cifs_mkdir, 1145 .rmdir = cifs_rmdir, 1146 .rename = cifs_rename2, 1147 .permission = cifs_permission, 1148 .setattr = cifs_setattr, 1149 .symlink = cifs_symlink, 1150 .mknod = cifs_mknod, 1151 .listxattr = cifs_listxattr, 1152 .get_acl = cifs_get_acl, 1153 .set_acl = cifs_set_acl, 1154 }; 1155 1156 const struct inode_operations cifs_file_inode_ops = { 1157 .setattr = cifs_setattr, 1158 .getattr = cifs_getattr, 1159 .permission = cifs_permission, 1160 .listxattr = cifs_listxattr, 1161 .fiemap = cifs_fiemap, 1162 .get_acl = cifs_get_acl, 1163 .set_acl = cifs_set_acl, 1164 }; 1165 1166 const char *cifs_get_link(struct dentry *dentry, struct inode *inode, 1167 struct delayed_call *done) 1168 { 1169 char *target_path; 1170 1171 if (!dentry) 1172 return ERR_PTR(-ECHILD); 1173 1174 target_path = kmalloc(PATH_MAX, GFP_KERNEL); 1175 if (!target_path) 1176 return ERR_PTR(-ENOMEM); 1177 1178 spin_lock(&inode->i_lock); 1179 if (likely(CIFS_I(inode)->symlink_target)) { 1180 strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX); 1181 } else { 1182 kfree(target_path); 1183 target_path = ERR_PTR(-EOPNOTSUPP); 1184 } 1185 spin_unlock(&inode->i_lock); 1186 1187 if (!IS_ERR(target_path)) 1188 set_delayed_call(done, kfree_link, target_path); 1189 1190 return target_path; 1191 } 1192 1193 const struct inode_operations cifs_symlink_inode_ops = { 1194 .get_link = cifs_get_link, 1195 .setattr = cifs_setattr, 1196 .permission = cifs_permission, 1197 .listxattr = cifs_listxattr, 1198 }; 1199 1200 /* 1201 * Advance the EOF marker to after the source range. 1202 */ 1203 static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi, 1204 struct cifs_tcon *src_tcon, 1205 unsigned int xid, loff_t src_end) 1206 { 1207 struct cifsFileInfo *writeable_srcfile; 1208 int rc = -EINVAL; 1209 1210 writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY); 1211 if (writeable_srcfile) { 1212 if (src_tcon->ses->server->ops->set_file_size) 1213 rc = src_tcon->ses->server->ops->set_file_size( 1214 xid, src_tcon, writeable_srcfile, 1215 src_inode->i_size, true /* no need to set sparse */); 1216 else 1217 rc = -ENOSYS; 1218 cifsFileInfo_put(writeable_srcfile); 1219 cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc); 1220 } 1221 1222 if (rc < 0) 1223 goto set_failed; 1224 1225 netfs_resize_file(&src_cifsi->netfs, src_end, true); 1226 fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end); 1227 return 0; 1228 1229 set_failed: 1230 return filemap_write_and_wait(src_inode->i_mapping); 1231 } 1232 1233 /* 1234 * Flush out either the folio that overlaps the beginning of a range in which 1235 * pos resides or the folio that overlaps the end of a range unless that folio 1236 * is entirely within the range we're going to invalidate. We extend the flush 1237 * bounds to encompass the folio. 1238 */ 1239 static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend, 1240 bool first) 1241 { 1242 struct folio *folio; 1243 unsigned long long fpos, fend; 1244 pgoff_t index = pos / PAGE_SIZE; 1245 size_t size; 1246 int rc = 0; 1247 1248 folio = filemap_get_folio(inode->i_mapping, index); 1249 if (IS_ERR(folio)) 1250 return 0; 1251 1252 size = folio_size(folio); 1253 fpos = folio_pos(folio); 1254 fend = fpos + size - 1; 1255 *_fstart = min_t(unsigned long long, *_fstart, fpos); 1256 *_fend = max_t(unsigned long long, *_fend, fend); 1257 if ((first && pos == fpos) || (!first && pos == fend)) 1258 goto out; 1259 1260 rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend); 1261 out: 1262 folio_put(folio); 1263 return rc; 1264 } 1265 1266 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off, 1267 struct file *dst_file, loff_t destoff, loff_t len, 1268 unsigned int remap_flags) 1269 { 1270 struct inode *src_inode = file_inode(src_file); 1271 struct inode *target_inode = file_inode(dst_file); 1272 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode); 1273 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode); 1274 struct cifsFileInfo *smb_file_src = src_file->private_data; 1275 struct cifsFileInfo *smb_file_target = dst_file->private_data; 1276 struct cifs_tcon *target_tcon, *src_tcon; 1277 unsigned long long destend, fstart, fend, old_size, new_size; 1278 unsigned int xid; 1279 int rc; 1280 1281 if (remap_flags & REMAP_FILE_DEDUP) 1282 return -EOPNOTSUPP; 1283 if (remap_flags & ~REMAP_FILE_ADVISORY) 1284 return -EINVAL; 1285 1286 cifs_dbg(FYI, "clone range\n"); 1287 1288 xid = get_xid(); 1289 1290 if (!smb_file_src || !smb_file_target) { 1291 rc = -EBADF; 1292 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n"); 1293 goto out; 1294 } 1295 1296 src_tcon = tlink_tcon(smb_file_src->tlink); 1297 target_tcon = tlink_tcon(smb_file_target->tlink); 1298 1299 /* 1300 * Note: cifs case is easier than btrfs since server responsible for 1301 * checks for proper open modes and file type and if it wants 1302 * server could even support copy of range where source = target 1303 */ 1304 lock_two_nondirectories(target_inode, src_inode); 1305 1306 if (len == 0) 1307 len = src_inode->i_size - off; 1308 1309 cifs_dbg(FYI, "clone range\n"); 1310 1311 /* Flush the source buffer */ 1312 rc = filemap_write_and_wait_range(src_inode->i_mapping, off, 1313 off + len - 1); 1314 if (rc) 1315 goto unlock; 1316 1317 /* The server-side copy will fail if the source crosses the EOF marker. 1318 * Advance the EOF marker after the flush above to the end of the range 1319 * if it's short of that. 1320 */ 1321 if (src_cifsi->netfs.remote_i_size < off + len) { 1322 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len); 1323 if (rc < 0) 1324 goto unlock; 1325 } 1326 1327 new_size = destoff + len; 1328 destend = destoff + len - 1; 1329 1330 /* Flush the folios at either end of the destination range to prevent 1331 * accidental loss of dirty data outside of the range. 1332 */ 1333 fstart = destoff; 1334 fend = destend; 1335 1336 rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true); 1337 if (rc) 1338 goto unlock; 1339 rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false); 1340 if (rc) 1341 goto unlock; 1342 if (fend > target_cifsi->netfs.zero_point) 1343 target_cifsi->netfs.zero_point = fend + 1; 1344 old_size = target_cifsi->netfs.remote_i_size; 1345 1346 /* Discard all the folios that overlap the destination region. */ 1347 cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend); 1348 truncate_inode_pages_range(&target_inode->i_data, fstart, fend); 1349 1350 fscache_invalidate(cifs_inode_cookie(target_inode), NULL, 1351 i_size_read(target_inode), 0); 1352 1353 rc = -EOPNOTSUPP; 1354 if (target_tcon->ses->server->ops->duplicate_extents) { 1355 rc = target_tcon->ses->server->ops->duplicate_extents(xid, 1356 smb_file_src, smb_file_target, off, len, destoff); 1357 if (rc == 0 && new_size > old_size) { 1358 truncate_setsize(target_inode, new_size); 1359 fscache_resize_cookie(cifs_inode_cookie(target_inode), 1360 new_size); 1361 } 1362 if (rc == 0 && new_size > target_cifsi->netfs.zero_point) 1363 target_cifsi->netfs.zero_point = new_size; 1364 } 1365 1366 /* force revalidate of size and timestamps of target file now 1367 that target is updated on the server */ 1368 CIFS_I(target_inode)->time = 0; 1369 unlock: 1370 /* although unlocking in the reverse order from locking is not 1371 strictly necessary here it is a little cleaner to be consistent */ 1372 unlock_two_nondirectories(src_inode, target_inode); 1373 out: 1374 free_xid(xid); 1375 return rc < 0 ? rc : len; 1376 } 1377 1378 ssize_t cifs_file_copychunk_range(unsigned int xid, 1379 struct file *src_file, loff_t off, 1380 struct file *dst_file, loff_t destoff, 1381 size_t len, unsigned int flags) 1382 { 1383 struct inode *src_inode = file_inode(src_file); 1384 struct inode *target_inode = file_inode(dst_file); 1385 struct cifsInodeInfo *src_cifsi = CIFS_I(src_inode); 1386 struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode); 1387 struct cifsFileInfo *smb_file_src; 1388 struct cifsFileInfo *smb_file_target; 1389 struct cifs_tcon *src_tcon; 1390 struct cifs_tcon *target_tcon; 1391 ssize_t rc; 1392 1393 cifs_dbg(FYI, "copychunk range\n"); 1394 1395 if (!src_file->private_data || !dst_file->private_data) { 1396 rc = -EBADF; 1397 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n"); 1398 goto out; 1399 } 1400 1401 rc = -EXDEV; 1402 smb_file_target = dst_file->private_data; 1403 smb_file_src = src_file->private_data; 1404 src_tcon = tlink_tcon(smb_file_src->tlink); 1405 target_tcon = tlink_tcon(smb_file_target->tlink); 1406 1407 if (src_tcon->ses != target_tcon->ses) { 1408 cifs_dbg(FYI, "source and target of copy not on same server\n"); 1409 goto out; 1410 } 1411 1412 rc = -EOPNOTSUPP; 1413 if (!target_tcon->ses->server->ops->copychunk_range) 1414 goto out; 1415 1416 /* 1417 * Note: cifs case is easier than btrfs since server responsible for 1418 * checks for proper open modes and file type and if it wants 1419 * server could even support copy of range where source = target 1420 */ 1421 lock_two_nondirectories(target_inode, src_inode); 1422 1423 cifs_dbg(FYI, "about to flush pages\n"); 1424 1425 rc = filemap_write_and_wait_range(src_inode->i_mapping, off, 1426 off + len - 1); 1427 if (rc) 1428 goto unlock; 1429 1430 /* The server-side copy will fail if the source crosses the EOF marker. 1431 * Advance the EOF marker after the flush above to the end of the range 1432 * if it's short of that. 1433 */ 1434 if (src_cifsi->netfs.remote_i_size < off + len) { 1435 rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len); 1436 if (rc < 0) 1437 goto unlock; 1438 } 1439 1440 /* Flush and invalidate all the folios in the destination region. If 1441 * the copy was successful, then some of the flush is extra overhead, 1442 * but we need to allow for the copy failing in some way (eg. ENOSPC). 1443 */ 1444 rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1); 1445 if (rc) 1446 goto unlock; 1447 1448 fscache_invalidate(cifs_inode_cookie(target_inode), NULL, 1449 i_size_read(target_inode), 0); 1450 1451 rc = file_modified(dst_file); 1452 if (!rc) { 1453 rc = target_tcon->ses->server->ops->copychunk_range(xid, 1454 smb_file_src, smb_file_target, off, len, destoff); 1455 if (rc > 0 && destoff + rc > i_size_read(target_inode)) { 1456 truncate_setsize(target_inode, destoff + rc); 1457 netfs_resize_file(&target_cifsi->netfs, 1458 i_size_read(target_inode), true); 1459 fscache_resize_cookie(cifs_inode_cookie(target_inode), 1460 i_size_read(target_inode)); 1461 } 1462 if (rc > 0 && destoff + rc > target_cifsi->netfs.zero_point) 1463 target_cifsi->netfs.zero_point = destoff + rc; 1464 } 1465 1466 file_accessed(src_file); 1467 1468 /* force revalidate of size and timestamps of target file now 1469 * that target is updated on the server 1470 */ 1471 CIFS_I(target_inode)->time = 0; 1472 1473 unlock: 1474 /* although unlocking in the reverse order from locking is not 1475 * strictly necessary here it is a little cleaner to be consistent 1476 */ 1477 unlock_two_nondirectories(src_inode, target_inode); 1478 1479 out: 1480 return rc; 1481 } 1482 1483 /* 1484 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync() 1485 * is a dummy operation. 1486 */ 1487 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync) 1488 { 1489 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n", 1490 file, datasync); 1491 1492 return 0; 1493 } 1494 1495 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off, 1496 struct file *dst_file, loff_t destoff, 1497 size_t len, unsigned int flags) 1498 { 1499 unsigned int xid = get_xid(); 1500 ssize_t rc; 1501 struct cifsFileInfo *cfile = dst_file->private_data; 1502 1503 if (cfile->swapfile) { 1504 rc = -EOPNOTSUPP; 1505 free_xid(xid); 1506 return rc; 1507 } 1508 1509 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff, 1510 len, flags); 1511 free_xid(xid); 1512 1513 if (rc == -EOPNOTSUPP || rc == -EXDEV) 1514 rc = splice_copy_file_range(src_file, off, dst_file, 1515 destoff, len); 1516 return rc; 1517 } 1518 1519 const struct file_operations cifs_file_ops = { 1520 .read_iter = cifs_loose_read_iter, 1521 .write_iter = cifs_file_write_iter, 1522 .open = cifs_open, 1523 .release = cifs_close, 1524 .lock = cifs_lock, 1525 .flock = cifs_flock, 1526 .fsync = cifs_fsync, 1527 .flush = cifs_flush, 1528 .mmap = cifs_file_mmap, 1529 .splice_read = filemap_splice_read, 1530 .splice_write = iter_file_splice_write, 1531 .llseek = cifs_llseek, 1532 .unlocked_ioctl = cifs_ioctl, 1533 .copy_file_range = cifs_copy_file_range, 1534 .remap_file_range = cifs_remap_file_range, 1535 .setlease = cifs_setlease, 1536 .fallocate = cifs_fallocate, 1537 }; 1538 1539 const struct file_operations cifs_file_strict_ops = { 1540 .read_iter = cifs_strict_readv, 1541 .write_iter = cifs_strict_writev, 1542 .open = cifs_open, 1543 .release = cifs_close, 1544 .lock = cifs_lock, 1545 .flock = cifs_flock, 1546 .fsync = cifs_strict_fsync, 1547 .flush = cifs_flush, 1548 .mmap = cifs_file_strict_mmap, 1549 .splice_read = filemap_splice_read, 1550 .splice_write = iter_file_splice_write, 1551 .llseek = cifs_llseek, 1552 .unlocked_ioctl = cifs_ioctl, 1553 .copy_file_range = cifs_copy_file_range, 1554 .remap_file_range = cifs_remap_file_range, 1555 .setlease = cifs_setlease, 1556 .fallocate = cifs_fallocate, 1557 }; 1558 1559 const struct file_operations cifs_file_direct_ops = { 1560 .read_iter = netfs_unbuffered_read_iter, 1561 .write_iter = netfs_file_write_iter, 1562 .open = cifs_open, 1563 .release = cifs_close, 1564 .lock = cifs_lock, 1565 .flock = cifs_flock, 1566 .fsync = cifs_fsync, 1567 .flush = cifs_flush, 1568 .mmap = cifs_file_mmap, 1569 .splice_read = copy_splice_read, 1570 .splice_write = iter_file_splice_write, 1571 .unlocked_ioctl = cifs_ioctl, 1572 .copy_file_range = cifs_copy_file_range, 1573 .remap_file_range = cifs_remap_file_range, 1574 .llseek = cifs_llseek, 1575 .setlease = cifs_setlease, 1576 .fallocate = cifs_fallocate, 1577 }; 1578 1579 const struct file_operations cifs_file_nobrl_ops = { 1580 .read_iter = cifs_loose_read_iter, 1581 .write_iter = cifs_file_write_iter, 1582 .open = cifs_open, 1583 .release = cifs_close, 1584 .fsync = cifs_fsync, 1585 .flush = cifs_flush, 1586 .mmap = cifs_file_mmap, 1587 .splice_read = filemap_splice_read, 1588 .splice_write = iter_file_splice_write, 1589 .llseek = cifs_llseek, 1590 .unlocked_ioctl = cifs_ioctl, 1591 .copy_file_range = cifs_copy_file_range, 1592 .remap_file_range = cifs_remap_file_range, 1593 .setlease = cifs_setlease, 1594 .fallocate = cifs_fallocate, 1595 }; 1596 1597 const struct file_operations cifs_file_strict_nobrl_ops = { 1598 .read_iter = cifs_strict_readv, 1599 .write_iter = cifs_strict_writev, 1600 .open = cifs_open, 1601 .release = cifs_close, 1602 .fsync = cifs_strict_fsync, 1603 .flush = cifs_flush, 1604 .mmap = cifs_file_strict_mmap, 1605 .splice_read = filemap_splice_read, 1606 .splice_write = iter_file_splice_write, 1607 .llseek = cifs_llseek, 1608 .unlocked_ioctl = cifs_ioctl, 1609 .copy_file_range = cifs_copy_file_range, 1610 .remap_file_range = cifs_remap_file_range, 1611 .setlease = cifs_setlease, 1612 .fallocate = cifs_fallocate, 1613 }; 1614 1615 const struct file_operations cifs_file_direct_nobrl_ops = { 1616 .read_iter = netfs_unbuffered_read_iter, 1617 .write_iter = netfs_file_write_iter, 1618 .open = cifs_open, 1619 .release = cifs_close, 1620 .fsync = cifs_fsync, 1621 .flush = cifs_flush, 1622 .mmap = cifs_file_mmap, 1623 .splice_read = copy_splice_read, 1624 .splice_write = iter_file_splice_write, 1625 .unlocked_ioctl = cifs_ioctl, 1626 .copy_file_range = cifs_copy_file_range, 1627 .remap_file_range = cifs_remap_file_range, 1628 .llseek = cifs_llseek, 1629 .setlease = cifs_setlease, 1630 .fallocate = cifs_fallocate, 1631 }; 1632 1633 const struct file_operations cifs_dir_ops = { 1634 .iterate_shared = cifs_readdir, 1635 .release = cifs_closedir, 1636 .read = generic_read_dir, 1637 .unlocked_ioctl = cifs_ioctl, 1638 .copy_file_range = cifs_copy_file_range, 1639 .remap_file_range = cifs_remap_file_range, 1640 .llseek = generic_file_llseek, 1641 .fsync = cifs_dir_fsync, 1642 }; 1643 1644 static void 1645 cifs_init_once(void *inode) 1646 { 1647 struct cifsInodeInfo *cifsi = inode; 1648 1649 inode_init_once(&cifsi->netfs.inode); 1650 init_rwsem(&cifsi->lock_sem); 1651 } 1652 1653 static int __init 1654 cifs_init_inodecache(void) 1655 { 1656 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", 1657 sizeof(struct cifsInodeInfo), 1658 0, (SLAB_RECLAIM_ACCOUNT| 1659 SLAB_ACCOUNT), 1660 cifs_init_once); 1661 if (cifs_inode_cachep == NULL) 1662 return -ENOMEM; 1663 1664 return 0; 1665 } 1666 1667 static void 1668 cifs_destroy_inodecache(void) 1669 { 1670 /* 1671 * Make sure all delayed rcu free inodes are flushed before we 1672 * destroy cache. 1673 */ 1674 rcu_barrier(); 1675 kmem_cache_destroy(cifs_inode_cachep); 1676 } 1677 1678 static int 1679 cifs_init_request_bufs(void) 1680 { 1681 /* 1682 * SMB2 maximum header size is bigger than CIFS one - no problems to 1683 * allocate some more bytes for CIFS. 1684 */ 1685 size_t max_hdr_size = MAX_SMB2_HDR_SIZE; 1686 1687 if (CIFSMaxBufSize < 8192) { 1688 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum 1689 Unicode path name has to fit in any SMB/CIFS path based frames */ 1690 CIFSMaxBufSize = 8192; 1691 } else if (CIFSMaxBufSize > 1024*127) { 1692 CIFSMaxBufSize = 1024 * 127; 1693 } else { 1694 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ 1695 } 1696 /* 1697 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n", 1698 CIFSMaxBufSize, CIFSMaxBufSize); 1699 */ 1700 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request", 1701 CIFSMaxBufSize + max_hdr_size, 0, 1702 SLAB_HWCACHE_ALIGN, 0, 1703 CIFSMaxBufSize + max_hdr_size, 1704 NULL); 1705 if (cifs_req_cachep == NULL) 1706 return -ENOMEM; 1707 1708 if (cifs_min_rcv < 1) 1709 cifs_min_rcv = 1; 1710 else if (cifs_min_rcv > 64) { 1711 cifs_min_rcv = 64; 1712 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n"); 1713 } 1714 1715 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv, 1716 cifs_req_cachep); 1717 1718 if (cifs_req_poolp == NULL) { 1719 kmem_cache_destroy(cifs_req_cachep); 1720 return -ENOMEM; 1721 } 1722 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and 1723 almost all handle based requests (but not write response, nor is it 1724 sufficient for path based requests). A smaller size would have 1725 been more efficient (compacting multiple slab items on one 4k page) 1726 for the case in which debug was on, but this larger size allows 1727 more SMBs to use small buffer alloc and is still much more 1728 efficient to alloc 1 per page off the slab compared to 17K (5page) 1729 alloc of large cifs buffers even when page debugging is on */ 1730 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq", 1731 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, 1732 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL); 1733 if (cifs_sm_req_cachep == NULL) { 1734 mempool_destroy(cifs_req_poolp); 1735 kmem_cache_destroy(cifs_req_cachep); 1736 return -ENOMEM; 1737 } 1738 1739 if (cifs_min_small < 2) 1740 cifs_min_small = 2; 1741 else if (cifs_min_small > 256) { 1742 cifs_min_small = 256; 1743 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n"); 1744 } 1745 1746 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small, 1747 cifs_sm_req_cachep); 1748 1749 if (cifs_sm_req_poolp == NULL) { 1750 mempool_destroy(cifs_req_poolp); 1751 kmem_cache_destroy(cifs_req_cachep); 1752 kmem_cache_destroy(cifs_sm_req_cachep); 1753 return -ENOMEM; 1754 } 1755 1756 return 0; 1757 } 1758 1759 static void 1760 cifs_destroy_request_bufs(void) 1761 { 1762 mempool_destroy(cifs_req_poolp); 1763 kmem_cache_destroy(cifs_req_cachep); 1764 mempool_destroy(cifs_sm_req_poolp); 1765 kmem_cache_destroy(cifs_sm_req_cachep); 1766 } 1767 1768 static int init_mids(void) 1769 { 1770 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", 1771 sizeof(struct mid_q_entry), 0, 1772 SLAB_HWCACHE_ALIGN, NULL); 1773 if (cifs_mid_cachep == NULL) 1774 return -ENOMEM; 1775 1776 /* 3 is a reasonable minimum number of simultaneous operations */ 1777 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep); 1778 if (cifs_mid_poolp == NULL) { 1779 kmem_cache_destroy(cifs_mid_cachep); 1780 return -ENOMEM; 1781 } 1782 1783 return 0; 1784 } 1785 1786 static void destroy_mids(void) 1787 { 1788 mempool_destroy(cifs_mid_poolp); 1789 kmem_cache_destroy(cifs_mid_cachep); 1790 } 1791 1792 static int cifs_init_netfs(void) 1793 { 1794 cifs_io_request_cachep = 1795 kmem_cache_create("cifs_io_request", 1796 sizeof(struct cifs_io_request), 0, 1797 SLAB_HWCACHE_ALIGN, NULL); 1798 if (!cifs_io_request_cachep) 1799 goto nomem_req; 1800 1801 if (mempool_init_slab_pool(&cifs_io_request_pool, 100, cifs_io_request_cachep) < 0) 1802 goto nomem_reqpool; 1803 1804 cifs_io_subrequest_cachep = 1805 kmem_cache_create("cifs_io_subrequest", 1806 sizeof(struct cifs_io_subrequest), 0, 1807 SLAB_HWCACHE_ALIGN, NULL); 1808 if (!cifs_io_subrequest_cachep) 1809 goto nomem_subreq; 1810 1811 if (mempool_init_slab_pool(&cifs_io_subrequest_pool, 100, cifs_io_subrequest_cachep) < 0) 1812 goto nomem_subreqpool; 1813 1814 return 0; 1815 1816 nomem_subreqpool: 1817 kmem_cache_destroy(cifs_io_subrequest_cachep); 1818 nomem_subreq: 1819 mempool_exit(&cifs_io_request_pool); 1820 nomem_reqpool: 1821 kmem_cache_destroy(cifs_io_request_cachep); 1822 nomem_req: 1823 return -ENOMEM; 1824 } 1825 1826 static void cifs_destroy_netfs(void) 1827 { 1828 mempool_exit(&cifs_io_subrequest_pool); 1829 kmem_cache_destroy(cifs_io_subrequest_cachep); 1830 mempool_exit(&cifs_io_request_pool); 1831 kmem_cache_destroy(cifs_io_request_cachep); 1832 } 1833 1834 static int __init 1835 init_cifs(void) 1836 { 1837 int rc = 0; 1838 cifs_proc_init(); 1839 INIT_LIST_HEAD(&cifs_tcp_ses_list); 1840 /* 1841 * Initialize Global counters 1842 */ 1843 atomic_set(&sesInfoAllocCount, 0); 1844 atomic_set(&tconInfoAllocCount, 0); 1845 atomic_set(&tcpSesNextId, 0); 1846 atomic_set(&tcpSesAllocCount, 0); 1847 atomic_set(&tcpSesReconnectCount, 0); 1848 atomic_set(&tconInfoReconnectCount, 0); 1849 1850 atomic_set(&buf_alloc_count, 0); 1851 atomic_set(&small_buf_alloc_count, 0); 1852 #ifdef CONFIG_CIFS_STATS2 1853 atomic_set(&total_buf_alloc_count, 0); 1854 atomic_set(&total_small_buf_alloc_count, 0); 1855 if (slow_rsp_threshold < 1) 1856 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n"); 1857 else if (slow_rsp_threshold > 32767) 1858 cifs_dbg(VFS, 1859 "slow response threshold set higher than recommended (0 to 32767)\n"); 1860 #endif /* CONFIG_CIFS_STATS2 */ 1861 1862 atomic_set(&mid_count, 0); 1863 GlobalCurrentXid = 0; 1864 GlobalTotalActiveXid = 0; 1865 GlobalMaxActiveXid = 0; 1866 spin_lock_init(&cifs_tcp_ses_lock); 1867 spin_lock_init(&GlobalMid_Lock); 1868 1869 cifs_lock_secret = get_random_u32(); 1870 1871 if (cifs_max_pending < 2) { 1872 cifs_max_pending = 2; 1873 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n"); 1874 } else if (cifs_max_pending > CIFS_MAX_REQ) { 1875 cifs_max_pending = CIFS_MAX_REQ; 1876 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n", 1877 CIFS_MAX_REQ); 1878 } 1879 1880 /* Limit max to about 18 hours, and setting to zero disables directory entry caching */ 1881 if (dir_cache_timeout > 65000) { 1882 dir_cache_timeout = 65000; 1883 cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n"); 1884 } 1885 1886 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1887 if (!cifsiod_wq) { 1888 rc = -ENOMEM; 1889 goto out_clean_proc; 1890 } 1891 1892 /* 1893 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3) 1894 * so that we don't launch too many worker threads but 1895 * Documentation/core-api/workqueue.rst recommends setting it to 0 1896 */ 1897 1898 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */ 1899 decrypt_wq = alloc_workqueue("smb3decryptd", 1900 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1901 if (!decrypt_wq) { 1902 rc = -ENOMEM; 1903 goto out_destroy_cifsiod_wq; 1904 } 1905 1906 fileinfo_put_wq = alloc_workqueue("cifsfileinfoput", 1907 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1908 if (!fileinfo_put_wq) { 1909 rc = -ENOMEM; 1910 goto out_destroy_decrypt_wq; 1911 } 1912 1913 cifsoplockd_wq = alloc_workqueue("cifsoplockd", 1914 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1915 if (!cifsoplockd_wq) { 1916 rc = -ENOMEM; 1917 goto out_destroy_fileinfo_put_wq; 1918 } 1919 1920 deferredclose_wq = alloc_workqueue("deferredclose", 1921 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1922 if (!deferredclose_wq) { 1923 rc = -ENOMEM; 1924 goto out_destroy_cifsoplockd_wq; 1925 } 1926 1927 serverclose_wq = alloc_workqueue("serverclose", 1928 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1929 if (!serverclose_wq) { 1930 rc = -ENOMEM; 1931 goto out_destroy_deferredclose_wq; 1932 } 1933 1934 cfid_put_wq = alloc_workqueue("cfid_put_wq", 1935 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); 1936 if (!cfid_put_wq) { 1937 rc = -ENOMEM; 1938 goto out_destroy_serverclose_wq; 1939 } 1940 1941 rc = cifs_init_inodecache(); 1942 if (rc) 1943 goto out_destroy_cfid_put_wq; 1944 1945 rc = cifs_init_netfs(); 1946 if (rc) 1947 goto out_destroy_inodecache; 1948 1949 rc = init_mids(); 1950 if (rc) 1951 goto out_destroy_netfs; 1952 1953 rc = cifs_init_request_bufs(); 1954 if (rc) 1955 goto out_destroy_mids; 1956 1957 #ifdef CONFIG_CIFS_DFS_UPCALL 1958 rc = dfs_cache_init(); 1959 if (rc) 1960 goto out_destroy_request_bufs; 1961 #endif /* CONFIG_CIFS_DFS_UPCALL */ 1962 #ifdef CONFIG_CIFS_UPCALL 1963 rc = init_cifs_spnego(); 1964 if (rc) 1965 goto out_destroy_dfs_cache; 1966 #endif /* CONFIG_CIFS_UPCALL */ 1967 #ifdef CONFIG_CIFS_SWN_UPCALL 1968 rc = cifs_genl_init(); 1969 if (rc) 1970 goto out_register_key_type; 1971 #endif /* CONFIG_CIFS_SWN_UPCALL */ 1972 1973 rc = init_cifs_idmap(); 1974 if (rc) 1975 goto out_cifs_swn_init; 1976 1977 rc = register_filesystem(&cifs_fs_type); 1978 if (rc) 1979 goto out_init_cifs_idmap; 1980 1981 rc = register_filesystem(&smb3_fs_type); 1982 if (rc) { 1983 unregister_filesystem(&cifs_fs_type); 1984 goto out_init_cifs_idmap; 1985 } 1986 1987 return 0; 1988 1989 out_init_cifs_idmap: 1990 exit_cifs_idmap(); 1991 out_cifs_swn_init: 1992 #ifdef CONFIG_CIFS_SWN_UPCALL 1993 cifs_genl_exit(); 1994 out_register_key_type: 1995 #endif 1996 #ifdef CONFIG_CIFS_UPCALL 1997 exit_cifs_spnego(); 1998 out_destroy_dfs_cache: 1999 #endif 2000 #ifdef CONFIG_CIFS_DFS_UPCALL 2001 dfs_cache_destroy(); 2002 out_destroy_request_bufs: 2003 #endif 2004 cifs_destroy_request_bufs(); 2005 out_destroy_mids: 2006 destroy_mids(); 2007 out_destroy_netfs: 2008 cifs_destroy_netfs(); 2009 out_destroy_inodecache: 2010 cifs_destroy_inodecache(); 2011 out_destroy_cfid_put_wq: 2012 destroy_workqueue(cfid_put_wq); 2013 out_destroy_serverclose_wq: 2014 destroy_workqueue(serverclose_wq); 2015 out_destroy_deferredclose_wq: 2016 destroy_workqueue(deferredclose_wq); 2017 out_destroy_cifsoplockd_wq: 2018 destroy_workqueue(cifsoplockd_wq); 2019 out_destroy_fileinfo_put_wq: 2020 destroy_workqueue(fileinfo_put_wq); 2021 out_destroy_decrypt_wq: 2022 destroy_workqueue(decrypt_wq); 2023 out_destroy_cifsiod_wq: 2024 destroy_workqueue(cifsiod_wq); 2025 out_clean_proc: 2026 cifs_proc_clean(); 2027 return rc; 2028 } 2029 2030 static void __exit 2031 exit_cifs(void) 2032 { 2033 cifs_dbg(NOISY, "exit_smb3\n"); 2034 unregister_filesystem(&cifs_fs_type); 2035 unregister_filesystem(&smb3_fs_type); 2036 cifs_release_automount_timer(); 2037 exit_cifs_idmap(); 2038 #ifdef CONFIG_CIFS_SWN_UPCALL 2039 cifs_genl_exit(); 2040 #endif 2041 #ifdef CONFIG_CIFS_UPCALL 2042 exit_cifs_spnego(); 2043 #endif 2044 #ifdef CONFIG_CIFS_DFS_UPCALL 2045 dfs_cache_destroy(); 2046 #endif 2047 cifs_destroy_request_bufs(); 2048 destroy_mids(); 2049 cifs_destroy_netfs(); 2050 cifs_destroy_inodecache(); 2051 destroy_workqueue(deferredclose_wq); 2052 destroy_workqueue(cifsoplockd_wq); 2053 destroy_workqueue(decrypt_wq); 2054 destroy_workqueue(fileinfo_put_wq); 2055 destroy_workqueue(serverclose_wq); 2056 destroy_workqueue(cfid_put_wq); 2057 destroy_workqueue(cifsiod_wq); 2058 cifs_proc_clean(); 2059 } 2060 2061 MODULE_AUTHOR("Steve French"); 2062 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ 2063 MODULE_DESCRIPTION 2064 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and " 2065 "also older servers complying with the SNIA CIFS Specification)"); 2066 MODULE_VERSION(CIFS_VERSION); 2067 MODULE_SOFTDEP("ecb"); 2068 MODULE_SOFTDEP("hmac"); 2069 MODULE_SOFTDEP("md5"); 2070 MODULE_SOFTDEP("nls"); 2071 MODULE_SOFTDEP("aes"); 2072 MODULE_SOFTDEP("cmac"); 2073 MODULE_SOFTDEP("sha256"); 2074 MODULE_SOFTDEP("sha512"); 2075 MODULE_SOFTDEP("aead2"); 2076 MODULE_SOFTDEP("ccm"); 2077 MODULE_SOFTDEP("gcm"); 2078 module_init(init_cifs) 2079 module_exit(exit_cifs) 2080