1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2010 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * 7 */ 8 #include <linux/fs.h> 9 #include <linux/stat.h> 10 #include <linux/slab.h> 11 #include <linux/pagemap.h> 12 #include <linux/freezer.h> 13 #include <linux/sched/signal.h> 14 #include <linux/wait_bit.h> 15 #include <linux/fiemap.h> 16 #include <asm/div64.h> 17 #include "cifsfs.h" 18 #include "cifspdu.h" 19 #include "cifsglob.h" 20 #include "cifsproto.h" 21 #include "smb2proto.h" 22 #include "cifs_debug.h" 23 #include "cifs_fs_sb.h" 24 #include "cifs_unicode.h" 25 #include "fscache.h" 26 #include "fs_context.h" 27 #include "cifs_ioctl.h" 28 #include "cached_dir.h" 29 #include "reparse.h" 30 31 static void cifs_set_ops(struct inode *inode) 32 { 33 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 34 35 switch (inode->i_mode & S_IFMT) { 36 case S_IFREG: 37 inode->i_op = &cifs_file_inode_ops; 38 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { 39 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) 40 inode->i_fop = &cifs_file_direct_nobrl_ops; 41 else 42 inode->i_fop = &cifs_file_direct_ops; 43 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { 44 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) 45 inode->i_fop = &cifs_file_strict_nobrl_ops; 46 else 47 inode->i_fop = &cifs_file_strict_ops; 48 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) 49 inode->i_fop = &cifs_file_nobrl_ops; 50 else { /* not direct, send byte range locks */ 51 inode->i_fop = &cifs_file_ops; 52 } 53 54 /* check if server can support readahead */ 55 if (cifs_sb_master_tcon(cifs_sb)->ses->server->max_read < 56 PAGE_SIZE + MAX_CIFS_HDR_SIZE) 57 inode->i_data.a_ops = &cifs_addr_ops_smallbuf; 58 else 59 inode->i_data.a_ops = &cifs_addr_ops; 60 break; 61 case S_IFDIR: 62 if (IS_AUTOMOUNT(inode)) { 63 inode->i_op = &cifs_namespace_inode_operations; 64 } else { 65 inode->i_op = &cifs_dir_inode_ops; 66 inode->i_fop = &cifs_dir_ops; 67 } 68 break; 69 case S_IFLNK: 70 inode->i_op = &cifs_symlink_inode_ops; 71 break; 72 default: 73 init_special_inode(inode, inode->i_mode, inode->i_rdev); 74 break; 75 } 76 } 77 78 /* check inode attributes against fattr. If they don't match, tag the 79 * inode for cache invalidation 80 */ 81 static void 82 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr) 83 { 84 struct cifs_fscache_inode_coherency_data cd; 85 struct cifsInodeInfo *cifs_i = CIFS_I(inode); 86 struct timespec64 mtime; 87 88 cifs_dbg(FYI, "%s: revalidating inode %llu\n", 89 __func__, cifs_i->uniqueid); 90 91 if (inode->i_state & I_NEW) { 92 cifs_dbg(FYI, "%s: inode %llu is new\n", 93 __func__, cifs_i->uniqueid); 94 return; 95 } 96 97 /* don't bother with revalidation if we have an oplock */ 98 if (CIFS_CACHE_READ(cifs_i)) { 99 cifs_dbg(FYI, "%s: inode %llu is oplocked\n", 100 __func__, cifs_i->uniqueid); 101 return; 102 } 103 104 /* revalidate if mtime or size have changed */ 105 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode); 106 mtime = inode_get_mtime(inode); 107 if (timespec64_equal(&mtime, &fattr->cf_mtime) && 108 cifs_i->server_eof == fattr->cf_eof) { 109 cifs_dbg(FYI, "%s: inode %llu is unchanged\n", 110 __func__, cifs_i->uniqueid); 111 return; 112 } 113 114 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n", 115 __func__, cifs_i->uniqueid); 116 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags); 117 /* Invalidate fscache cookie */ 118 cifs_fscache_fill_coherency(&cifs_i->netfs.inode, &cd); 119 fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), 0); 120 } 121 122 /* 123 * copy nlink to the inode, unless it wasn't provided. Provide 124 * sane values if we don't have an existing one and none was provided 125 */ 126 static void 127 cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr) 128 { 129 /* 130 * if we're in a situation where we can't trust what we 131 * got from the server (readdir, some non-unix cases) 132 * fake reasonable values 133 */ 134 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) { 135 /* only provide fake values on a new inode */ 136 if (inode->i_state & I_NEW) { 137 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) 138 set_nlink(inode, 2); 139 else 140 set_nlink(inode, 1); 141 } 142 return; 143 } 144 145 /* we trust the server, so update it */ 146 set_nlink(inode, fattr->cf_nlink); 147 } 148 149 /* populate an inode with info from a cifs_fattr struct */ 150 int 151 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr, 152 bool from_readdir) 153 { 154 struct cifsInodeInfo *cifs_i = CIFS_I(inode); 155 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 156 157 if (!(inode->i_state & I_NEW) && 158 unlikely(inode_wrong_type(inode, fattr->cf_mode))) { 159 CIFS_I(inode)->time = 0; /* force reval */ 160 return -ESTALE; 161 } 162 163 cifs_revalidate_cache(inode, fattr); 164 165 spin_lock(&inode->i_lock); 166 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode); 167 fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode); 168 fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode); 169 /* we do not want atime to be less than mtime, it broke some apps */ 170 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0) 171 inode_set_atime_to_ts(inode, fattr->cf_mtime); 172 else 173 inode_set_atime_to_ts(inode, fattr->cf_atime); 174 inode_set_mtime_to_ts(inode, fattr->cf_mtime); 175 inode_set_ctime_to_ts(inode, fattr->cf_ctime); 176 inode->i_rdev = fattr->cf_rdev; 177 cifs_nlink_fattr_to_inode(inode, fattr); 178 inode->i_uid = fattr->cf_uid; 179 inode->i_gid = fattr->cf_gid; 180 181 /* if dynperm is set, don't clobber existing mode */ 182 if (inode->i_state & I_NEW || 183 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) 184 inode->i_mode = fattr->cf_mode; 185 186 cifs_i->cifsAttrs = fattr->cf_cifsattrs; 187 cifs_i->reparse_tag = fattr->cf_cifstag; 188 189 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL) 190 cifs_i->time = 0; 191 else 192 cifs_i->time = jiffies; 193 194 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING) 195 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags); 196 else 197 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags); 198 199 cifs_i->server_eof = fattr->cf_eof; 200 /* 201 * Can't safely change the file size here if the client is writing to 202 * it due to potential races. 203 */ 204 if (is_size_safe_to_change(cifs_i, fattr->cf_eof, from_readdir)) { 205 i_size_write(inode, fattr->cf_eof); 206 207 /* 208 * i_blocks is not related to (i_size / i_blksize), 209 * but instead 512 byte (2**9) size is required for 210 * calculating num blocks. 211 */ 212 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9; 213 } 214 215 if (S_ISLNK(fattr->cf_mode) && fattr->cf_symlink_target) { 216 kfree(cifs_i->symlink_target); 217 cifs_i->symlink_target = fattr->cf_symlink_target; 218 fattr->cf_symlink_target = NULL; 219 } 220 spin_unlock(&inode->i_lock); 221 222 if (fattr->cf_flags & CIFS_FATTR_JUNCTION) 223 inode->i_flags |= S_AUTOMOUNT; 224 if (inode->i_state & I_NEW) 225 cifs_set_ops(inode); 226 return 0; 227 } 228 229 void 230 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr) 231 { 232 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 233 234 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) 235 return; 236 237 fattr->cf_uniqueid = iunique(sb, ROOT_I); 238 } 239 240 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */ 241 void 242 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info, 243 struct cifs_sb_info *cifs_sb) 244 { 245 memset(fattr, 0, sizeof(*fattr)); 246 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId); 247 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes); 248 fattr->cf_eof = le64_to_cpu(info->EndOfFile); 249 250 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); 251 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime); 252 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange); 253 /* old POSIX extensions don't get create time */ 254 255 fattr->cf_mode = le64_to_cpu(info->Permissions); 256 257 /* 258 * Since we set the inode type below we need to mask off 259 * to avoid strange results if bits set above. 260 */ 261 fattr->cf_mode &= ~S_IFMT; 262 switch (le32_to_cpu(info->Type)) { 263 case UNIX_FILE: 264 fattr->cf_mode |= S_IFREG; 265 fattr->cf_dtype = DT_REG; 266 break; 267 case UNIX_SYMLINK: 268 fattr->cf_mode |= S_IFLNK; 269 fattr->cf_dtype = DT_LNK; 270 break; 271 case UNIX_DIR: 272 fattr->cf_mode |= S_IFDIR; 273 fattr->cf_dtype = DT_DIR; 274 break; 275 case UNIX_CHARDEV: 276 fattr->cf_mode |= S_IFCHR; 277 fattr->cf_dtype = DT_CHR; 278 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor), 279 le64_to_cpu(info->DevMinor) & MINORMASK); 280 break; 281 case UNIX_BLOCKDEV: 282 fattr->cf_mode |= S_IFBLK; 283 fattr->cf_dtype = DT_BLK; 284 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor), 285 le64_to_cpu(info->DevMinor) & MINORMASK); 286 break; 287 case UNIX_FIFO: 288 fattr->cf_mode |= S_IFIFO; 289 fattr->cf_dtype = DT_FIFO; 290 break; 291 case UNIX_SOCKET: 292 fattr->cf_mode |= S_IFSOCK; 293 fattr->cf_dtype = DT_SOCK; 294 break; 295 default: 296 /* safest to call it a file if we do not know */ 297 fattr->cf_mode |= S_IFREG; 298 fattr->cf_dtype = DT_REG; 299 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type)); 300 break; 301 } 302 303 fattr->cf_uid = cifs_sb->ctx->linux_uid; 304 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) { 305 u64 id = le64_to_cpu(info->Uid); 306 if (id < ((uid_t)-1)) { 307 kuid_t uid = make_kuid(&init_user_ns, id); 308 if (uid_valid(uid)) 309 fattr->cf_uid = uid; 310 } 311 } 312 313 fattr->cf_gid = cifs_sb->ctx->linux_gid; 314 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) { 315 u64 id = le64_to_cpu(info->Gid); 316 if (id < ((gid_t)-1)) { 317 kgid_t gid = make_kgid(&init_user_ns, id); 318 if (gid_valid(gid)) 319 fattr->cf_gid = gid; 320 } 321 } 322 323 fattr->cf_nlink = le64_to_cpu(info->Nlinks); 324 } 325 326 /* 327 * Fill a cifs_fattr struct with fake inode info. 328 * 329 * Needed to setup cifs_fattr data for the directory which is the 330 * junction to the new submount (ie to setup the fake directory 331 * which represents a DFS referral or reparse mount point). 332 */ 333 static void cifs_create_junction_fattr(struct cifs_fattr *fattr, 334 struct super_block *sb) 335 { 336 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 337 338 cifs_dbg(FYI, "%s: creating fake fattr\n", __func__); 339 340 memset(fattr, 0, sizeof(*fattr)); 341 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU; 342 fattr->cf_uid = cifs_sb->ctx->linux_uid; 343 fattr->cf_gid = cifs_sb->ctx->linux_gid; 344 ktime_get_coarse_real_ts64(&fattr->cf_mtime); 345 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime; 346 fattr->cf_nlink = 2; 347 fattr->cf_flags = CIFS_FATTR_JUNCTION; 348 } 349 350 /* Update inode with final fattr data */ 351 static int update_inode_info(struct super_block *sb, 352 struct cifs_fattr *fattr, 353 struct inode **inode) 354 { 355 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 356 int rc = 0; 357 358 if (!*inode) { 359 *inode = cifs_iget(sb, fattr); 360 if (!*inode) 361 rc = -ENOMEM; 362 return rc; 363 } 364 /* We already have inode, update it. 365 * 366 * If file type or uniqueid is different, return error. 367 */ 368 if (unlikely((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) && 369 CIFS_I(*inode)->uniqueid != fattr->cf_uniqueid)) { 370 CIFS_I(*inode)->time = 0; /* force reval */ 371 return -ESTALE; 372 } 373 return cifs_fattr_to_inode(*inode, fattr, false); 374 } 375 376 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 377 static int 378 cifs_get_file_info_unix(struct file *filp) 379 { 380 int rc; 381 unsigned int xid; 382 FILE_UNIX_BASIC_INFO find_data; 383 struct cifs_fattr fattr = {}; 384 struct inode *inode = file_inode(filp); 385 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 386 struct cifsFileInfo *cfile = filp->private_data; 387 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 388 389 xid = get_xid(); 390 391 if (cfile->symlink_target) { 392 fattr.cf_symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL); 393 if (!fattr.cf_symlink_target) { 394 rc = -ENOMEM; 395 goto cifs_gfiunix_out; 396 } 397 } 398 399 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data); 400 if (!rc) { 401 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb); 402 } else if (rc == -EREMOTE) { 403 cifs_create_junction_fattr(&fattr, inode->i_sb); 404 } else 405 goto cifs_gfiunix_out; 406 407 rc = cifs_fattr_to_inode(inode, &fattr, false); 408 409 cifs_gfiunix_out: 410 free_xid(xid); 411 return rc; 412 } 413 414 static int cifs_get_unix_fattr(const unsigned char *full_path, 415 struct super_block *sb, 416 struct cifs_fattr *fattr, 417 struct inode **pinode, 418 const unsigned int xid) 419 { 420 struct TCP_Server_Info *server; 421 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 422 FILE_UNIX_BASIC_INFO find_data; 423 struct cifs_tcon *tcon; 424 struct tcon_link *tlink; 425 int rc, tmprc; 426 427 cifs_dbg(FYI, "Getting info on %s\n", full_path); 428 429 tlink = cifs_sb_tlink(cifs_sb); 430 if (IS_ERR(tlink)) 431 return PTR_ERR(tlink); 432 tcon = tlink_tcon(tlink); 433 server = tcon->ses->server; 434 435 /* could have done a find first instead but this returns more info */ 436 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data, 437 cifs_sb->local_nls, cifs_remap(cifs_sb)); 438 cifs_dbg(FYI, "%s: query path info: rc = %d\n", __func__, rc); 439 cifs_put_tlink(tlink); 440 441 if (!rc) { 442 cifs_unix_basic_to_fattr(fattr, &find_data, cifs_sb); 443 } else if (rc == -EREMOTE) { 444 cifs_create_junction_fattr(fattr, sb); 445 rc = 0; 446 } else { 447 return rc; 448 } 449 450 if (!*pinode) 451 cifs_fill_uniqueid(sb, fattr); 452 453 /* check for Minshall+French symlinks */ 454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) { 455 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path); 456 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc); 457 } 458 459 if (S_ISLNK(fattr->cf_mode) && !fattr->cf_symlink_target) { 460 if (!server->ops->query_symlink) 461 return -EOPNOTSUPP; 462 rc = server->ops->query_symlink(xid, tcon, 463 cifs_sb, full_path, 464 &fattr->cf_symlink_target); 465 cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc); 466 } 467 return rc; 468 } 469 470 int cifs_get_inode_info_unix(struct inode **pinode, 471 const unsigned char *full_path, 472 struct super_block *sb, unsigned int xid) 473 { 474 struct cifs_fattr fattr = {}; 475 int rc; 476 477 rc = cifs_get_unix_fattr(full_path, sb, &fattr, pinode, xid); 478 if (rc) 479 goto out; 480 481 rc = update_inode_info(sb, &fattr, pinode); 482 out: 483 kfree(fattr.cf_symlink_target); 484 return rc; 485 } 486 #else 487 static inline int cifs_get_unix_fattr(const unsigned char *full_path, 488 struct super_block *sb, 489 struct cifs_fattr *fattr, 490 struct inode **pinode, 491 const unsigned int xid) 492 { 493 return -EOPNOTSUPP; 494 } 495 496 int cifs_get_inode_info_unix(struct inode **pinode, 497 const unsigned char *full_path, 498 struct super_block *sb, unsigned int xid) 499 { 500 return -EOPNOTSUPP; 501 } 502 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 503 504 static int 505 cifs_sfu_type(struct cifs_fattr *fattr, const char *path, 506 struct cifs_sb_info *cifs_sb, unsigned int xid) 507 { 508 int rc; 509 __u32 oplock; 510 struct tcon_link *tlink; 511 struct cifs_tcon *tcon; 512 struct cifs_fid fid; 513 struct cifs_open_parms oparms; 514 struct cifs_io_parms io_parms = {0}; 515 char buf[24]; 516 unsigned int bytes_read; 517 char *pbuf; 518 int buf_type = CIFS_NO_BUFFER; 519 520 pbuf = buf; 521 522 fattr->cf_mode &= ~S_IFMT; 523 524 if (fattr->cf_eof == 0) { 525 fattr->cf_mode |= S_IFIFO; 526 fattr->cf_dtype = DT_FIFO; 527 return 0; 528 } else if (fattr->cf_eof < 8) { 529 fattr->cf_mode |= S_IFREG; 530 fattr->cf_dtype = DT_REG; 531 return -EINVAL; /* EOPNOTSUPP? */ 532 } 533 534 tlink = cifs_sb_tlink(cifs_sb); 535 if (IS_ERR(tlink)) 536 return PTR_ERR(tlink); 537 tcon = tlink_tcon(tlink); 538 539 oparms = (struct cifs_open_parms) { 540 .tcon = tcon, 541 .cifs_sb = cifs_sb, 542 .desired_access = GENERIC_READ, 543 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR), 544 .disposition = FILE_OPEN, 545 .path = path, 546 .fid = &fid, 547 }; 548 549 if (tcon->ses->server->oplocks) 550 oplock = REQ_OPLOCK; 551 else 552 oplock = 0; 553 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL); 554 if (rc) { 555 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc); 556 cifs_put_tlink(tlink); 557 return rc; 558 } 559 560 /* Read header */ 561 io_parms.netfid = fid.netfid; 562 io_parms.pid = current->tgid; 563 io_parms.tcon = tcon; 564 io_parms.offset = 0; 565 io_parms.length = 24; 566 567 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms, 568 &bytes_read, &pbuf, &buf_type); 569 if ((rc == 0) && (bytes_read >= 8)) { 570 if (memcmp("IntxBLK", pbuf, 8) == 0) { 571 cifs_dbg(FYI, "Block device\n"); 572 fattr->cf_mode |= S_IFBLK; 573 fattr->cf_dtype = DT_BLK; 574 if (bytes_read == 24) { 575 /* we have enough to decode dev num */ 576 __u64 mjr; /* major */ 577 __u64 mnr; /* minor */ 578 mjr = le64_to_cpu(*(__le64 *)(pbuf+8)); 579 mnr = le64_to_cpu(*(__le64 *)(pbuf+16)); 580 fattr->cf_rdev = MKDEV(mjr, mnr); 581 } 582 } else if (memcmp("IntxCHR", pbuf, 8) == 0) { 583 cifs_dbg(FYI, "Char device\n"); 584 fattr->cf_mode |= S_IFCHR; 585 fattr->cf_dtype = DT_CHR; 586 if (bytes_read == 24) { 587 /* we have enough to decode dev num */ 588 __u64 mjr; /* major */ 589 __u64 mnr; /* minor */ 590 mjr = le64_to_cpu(*(__le64 *)(pbuf+8)); 591 mnr = le64_to_cpu(*(__le64 *)(pbuf+16)); 592 fattr->cf_rdev = MKDEV(mjr, mnr); 593 } 594 } else if (memcmp("IntxLNK", pbuf, 7) == 0) { 595 cifs_dbg(FYI, "Symlink\n"); 596 fattr->cf_mode |= S_IFLNK; 597 fattr->cf_dtype = DT_LNK; 598 } else if (memcmp("LnxFIFO", pbuf, 8) == 0) { 599 cifs_dbg(FYI, "FIFO\n"); 600 fattr->cf_mode |= S_IFIFO; 601 fattr->cf_dtype = DT_FIFO; 602 } else { 603 fattr->cf_mode |= S_IFREG; /* file? */ 604 fattr->cf_dtype = DT_REG; 605 rc = -EOPNOTSUPP; 606 } 607 } else { 608 fattr->cf_mode |= S_IFREG; /* then it is a file */ 609 fattr->cf_dtype = DT_REG; 610 rc = -EOPNOTSUPP; /* or some unknown SFU type */ 611 } 612 613 tcon->ses->server->ops->close(xid, tcon, &fid); 614 cifs_put_tlink(tlink); 615 return rc; 616 } 617 618 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */ 619 620 /* 621 * Fetch mode bits as provided by SFU. 622 * 623 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ? 624 */ 625 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path, 626 struct cifs_sb_info *cifs_sb, unsigned int xid) 627 { 628 #ifdef CONFIG_CIFS_XATTR 629 ssize_t rc; 630 char ea_value[4]; 631 __u32 mode; 632 struct tcon_link *tlink; 633 struct cifs_tcon *tcon; 634 635 tlink = cifs_sb_tlink(cifs_sb); 636 if (IS_ERR(tlink)) 637 return PTR_ERR(tlink); 638 tcon = tlink_tcon(tlink); 639 640 if (tcon->ses->server->ops->query_all_EAs == NULL) { 641 cifs_put_tlink(tlink); 642 return -EOPNOTSUPP; 643 } 644 645 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path, 646 "SETFILEBITS", ea_value, 4 /* size of buf */, 647 cifs_sb); 648 cifs_put_tlink(tlink); 649 if (rc < 0) 650 return (int)rc; 651 else if (rc > 3) { 652 mode = le32_to_cpu(*((__le32 *)ea_value)); 653 fattr->cf_mode &= ~SFBITS_MASK; 654 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n", 655 mode, fattr->cf_mode); 656 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode; 657 cifs_dbg(FYI, "special mode bits 0%o\n", mode); 658 } 659 660 return 0; 661 #else 662 return -EOPNOTSUPP; 663 #endif 664 } 665 666 #define POSIX_TYPE_FILE 0 667 #define POSIX_TYPE_DIR 1 668 #define POSIX_TYPE_SYMLINK 2 669 #define POSIX_TYPE_CHARDEV 3 670 #define POSIX_TYPE_BLKDEV 4 671 #define POSIX_TYPE_FIFO 5 672 #define POSIX_TYPE_SOCKET 6 673 674 #define POSIX_X_OTH 0000001 675 #define POSIX_W_OTH 0000002 676 #define POSIX_R_OTH 0000004 677 #define POSIX_X_GRP 0000010 678 #define POSIX_W_GRP 0000020 679 #define POSIX_R_GRP 0000040 680 #define POSIX_X_USR 0000100 681 #define POSIX_W_USR 0000200 682 #define POSIX_R_USR 0000400 683 #define POSIX_STICKY 0001000 684 #define POSIX_SET_GID 0002000 685 #define POSIX_SET_UID 0004000 686 687 #define POSIX_OTH_MASK 0000007 688 #define POSIX_GRP_MASK 0000070 689 #define POSIX_USR_MASK 0000700 690 #define POSIX_PERM_MASK 0000777 691 #define POSIX_FILETYPE_MASK 0070000 692 693 #define POSIX_FILETYPE_SHIFT 12 694 695 static u32 wire_perms_to_posix(u32 wire) 696 { 697 u32 mode = 0; 698 699 mode |= (wire & POSIX_X_OTH) ? S_IXOTH : 0; 700 mode |= (wire & POSIX_W_OTH) ? S_IWOTH : 0; 701 mode |= (wire & POSIX_R_OTH) ? S_IROTH : 0; 702 mode |= (wire & POSIX_X_GRP) ? S_IXGRP : 0; 703 mode |= (wire & POSIX_W_GRP) ? S_IWGRP : 0; 704 mode |= (wire & POSIX_R_GRP) ? S_IRGRP : 0; 705 mode |= (wire & POSIX_X_USR) ? S_IXUSR : 0; 706 mode |= (wire & POSIX_W_USR) ? S_IWUSR : 0; 707 mode |= (wire & POSIX_R_USR) ? S_IRUSR : 0; 708 mode |= (wire & POSIX_STICKY) ? S_ISVTX : 0; 709 mode |= (wire & POSIX_SET_GID) ? S_ISGID : 0; 710 mode |= (wire & POSIX_SET_UID) ? S_ISUID : 0; 711 712 return mode; 713 } 714 715 static u32 posix_filetypes[] = { 716 S_IFREG, 717 S_IFDIR, 718 S_IFLNK, 719 S_IFCHR, 720 S_IFBLK, 721 S_IFIFO, 722 S_IFSOCK 723 }; 724 725 static u32 wire_filetype_to_posix(u32 wire_type) 726 { 727 if (wire_type >= ARRAY_SIZE(posix_filetypes)) { 728 pr_warn("Unexpected type %u", wire_type); 729 return 0; 730 } 731 return posix_filetypes[wire_type]; 732 } 733 734 umode_t wire_mode_to_posix(u32 wire, bool is_dir) 735 { 736 u32 wire_type; 737 u32 mode; 738 739 wire_type = (wire & POSIX_FILETYPE_MASK) >> POSIX_FILETYPE_SHIFT; 740 /* older servers do not set POSIX file type in the mode field in the response */ 741 if ((wire_type == 0) && is_dir) 742 mode = wire_perms_to_posix(wire) | S_IFDIR; 743 else 744 mode = (wire_perms_to_posix(wire) | wire_filetype_to_posix(wire_type)); 745 return (umode_t)mode; 746 } 747 748 /* Fill a cifs_fattr struct with info from POSIX info struct */ 749 static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr, 750 struct cifs_open_info_data *data, 751 struct super_block *sb) 752 { 753 struct smb311_posix_qinfo *info = &data->posix_fi; 754 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 755 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 756 757 memset(fattr, 0, sizeof(*fattr)); 758 759 /* no fattr->flags to set */ 760 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes); 761 fattr->cf_uniqueid = le64_to_cpu(info->Inode); 762 763 if (info->LastAccessTime) 764 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); 765 else 766 ktime_get_coarse_real_ts64(&fattr->cf_atime); 767 768 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); 769 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); 770 771 if (data->adjust_tz) { 772 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj; 773 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj; 774 } 775 776 /* 777 * The srv fs device id is overridden on network mount so setting 778 * @fattr->cf_rdev isn't needed here. 779 */ 780 fattr->cf_eof = le64_to_cpu(info->EndOfFile); 781 fattr->cf_bytes = le64_to_cpu(info->AllocationSize); 782 fattr->cf_createtime = le64_to_cpu(info->CreationTime); 783 fattr->cf_nlink = le32_to_cpu(info->HardLinks); 784 fattr->cf_mode = wire_mode_to_posix(le32_to_cpu(info->Mode), 785 fattr->cf_cifsattrs & ATTR_DIRECTORY); 786 787 if (cifs_open_data_reparse(data) && 788 cifs_reparse_point_to_fattr(cifs_sb, fattr, data)) 789 goto out_reparse; 790 791 fattr->cf_dtype = S_DT(fattr->cf_mode); 792 793 out_reparse: 794 if (S_ISLNK(fattr->cf_mode)) { 795 if (likely(data->symlink_target)) 796 fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX); 797 fattr->cf_symlink_target = data->symlink_target; 798 data->symlink_target = NULL; 799 } 800 sid_to_id(cifs_sb, &data->posix_owner, fattr, SIDOWNER); 801 sid_to_id(cifs_sb, &data->posix_group, fattr, SIDGROUP); 802 803 cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n", 804 fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink); 805 } 806 807 static void cifs_open_info_to_fattr(struct cifs_fattr *fattr, 808 struct cifs_open_info_data *data, 809 struct super_block *sb) 810 { 811 struct smb2_file_all_info *info = &data->fi; 812 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 813 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 814 815 memset(fattr, 0, sizeof(*fattr)); 816 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes); 817 if (info->DeletePending) 818 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING; 819 820 if (info->LastAccessTime) 821 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); 822 else 823 ktime_get_coarse_real_ts64(&fattr->cf_atime); 824 825 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); 826 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); 827 828 if (data->adjust_tz) { 829 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj; 830 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj; 831 } 832 833 fattr->cf_eof = le64_to_cpu(info->EndOfFile); 834 fattr->cf_bytes = le64_to_cpu(info->AllocationSize); 835 fattr->cf_createtime = le64_to_cpu(info->CreationTime); 836 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks); 837 fattr->cf_uid = cifs_sb->ctx->linux_uid; 838 fattr->cf_gid = cifs_sb->ctx->linux_gid; 839 840 fattr->cf_mode = cifs_sb->ctx->file_mode; 841 if (cifs_open_data_reparse(data) && 842 cifs_reparse_point_to_fattr(cifs_sb, fattr, data)) 843 goto out_reparse; 844 845 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { 846 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode; 847 fattr->cf_dtype = DT_DIR; 848 /* 849 * Server can return wrong NumberOfLinks value for directories 850 * when Unix extensions are disabled - fake it. 851 */ 852 if (!tcon->unix_ext) 853 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK; 854 } else { 855 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode; 856 fattr->cf_dtype = DT_REG; 857 858 /* 859 * Don't accept zero nlink from non-unix servers unless 860 * delete is pending. Instead mark it as unknown. 861 */ 862 if ((fattr->cf_nlink < 1) && !tcon->unix_ext && 863 !info->DeletePending) { 864 cifs_dbg(VFS, "bogus file nlink value %u\n", 865 fattr->cf_nlink); 866 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK; 867 } 868 } 869 870 /* clear write bits if ATTR_READONLY is set */ 871 if (fattr->cf_cifsattrs & ATTR_READONLY) 872 fattr->cf_mode &= ~(S_IWUGO); 873 874 out_reparse: 875 if (S_ISLNK(fattr->cf_mode)) { 876 if (likely(data->symlink_target)) 877 fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX); 878 fattr->cf_symlink_target = data->symlink_target; 879 data->symlink_target = NULL; 880 } 881 } 882 883 static int 884 cifs_get_file_info(struct file *filp) 885 { 886 int rc; 887 unsigned int xid; 888 struct cifs_open_info_data data = {}; 889 struct cifs_fattr fattr; 890 struct inode *inode = file_inode(filp); 891 struct cifsFileInfo *cfile = filp->private_data; 892 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); 893 struct TCP_Server_Info *server = tcon->ses->server; 894 struct dentry *dentry = filp->f_path.dentry; 895 void *page = alloc_dentry_path(); 896 const unsigned char *path; 897 898 if (!server->ops->query_file_info) { 899 free_dentry_path(page); 900 return -ENOSYS; 901 } 902 903 xid = get_xid(); 904 rc = server->ops->query_file_info(xid, tcon, cfile, &data); 905 switch (rc) { 906 case 0: 907 /* TODO: add support to query reparse tag */ 908 data.adjust_tz = false; 909 if (data.symlink_target) { 910 data.symlink = true; 911 data.reparse.tag = IO_REPARSE_TAG_SYMLINK; 912 } 913 path = build_path_from_dentry(dentry, page); 914 if (IS_ERR(path)) { 915 rc = PTR_ERR(path); 916 goto cgfi_exit; 917 } 918 cifs_open_info_to_fattr(&fattr, &data, inode->i_sb); 919 if (fattr.cf_flags & CIFS_FATTR_DELETE_PENDING) 920 cifs_mark_open_handles_for_deleted_file(inode, path); 921 break; 922 case -EREMOTE: 923 cifs_create_junction_fattr(&fattr, inode->i_sb); 924 break; 925 case -EOPNOTSUPP: 926 case -EINVAL: 927 /* 928 * FIXME: legacy server -- fall back to path-based call? 929 * for now, just skip revalidating and mark inode for 930 * immediate reval. 931 */ 932 rc = 0; 933 CIFS_I(inode)->time = 0; 934 goto cgfi_exit; 935 default: 936 goto cgfi_exit; 937 } 938 939 /* 940 * don't bother with SFU junk here -- just mark inode as needing 941 * revalidation. 942 */ 943 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid; 944 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; 945 /* if filetype is different, return error */ 946 rc = cifs_fattr_to_inode(inode, &fattr, false); 947 cgfi_exit: 948 cifs_free_open_info(&data); 949 free_dentry_path(page); 950 free_xid(xid); 951 return rc; 952 } 953 954 /* Simple function to return a 64 bit hash of string. Rarely called */ 955 static __u64 simple_hashstr(const char *str) 956 { 957 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */ 958 __u64 hash = 0; 959 960 while (*str) 961 hash = (hash + (__u64) *str++) * hash_mult; 962 963 return hash; 964 } 965 966 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 967 /** 968 * cifs_backup_query_path_info - SMB1 fallback code to get ino 969 * 970 * Fallback code to get file metadata when we don't have access to 971 * full_path (EACCES) and have backup creds. 972 * 973 * @xid: transaction id used to identify original request in logs 974 * @tcon: information about the server share we have mounted 975 * @sb: the superblock stores info such as disk space available 976 * @full_path: name of the file we are getting the metadata for 977 * @resp_buf: will be set to cifs resp buf and needs to be freed with 978 * cifs_buf_release() when done with @data 979 * @data: will be set to search info result buffer 980 */ 981 static int 982 cifs_backup_query_path_info(int xid, 983 struct cifs_tcon *tcon, 984 struct super_block *sb, 985 const char *full_path, 986 void **resp_buf, 987 FILE_ALL_INFO **data) 988 { 989 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 990 struct cifs_search_info info = {0}; 991 u16 flags; 992 int rc; 993 994 *resp_buf = NULL; 995 info.endOfSearch = false; 996 if (tcon->unix_ext) 997 info.info_level = SMB_FIND_FILE_UNIX; 998 else if ((tcon->ses->capabilities & 999 tcon->ses->server->vals->cap_nt_find) == 0) 1000 info.info_level = SMB_FIND_FILE_INFO_STANDARD; 1001 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) 1002 info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; 1003 else /* no srvino useful for fallback to some netapp */ 1004 info.info_level = SMB_FIND_FILE_DIRECTORY_INFO; 1005 1006 flags = CIFS_SEARCH_CLOSE_ALWAYS | 1007 CIFS_SEARCH_CLOSE_AT_END | 1008 CIFS_SEARCH_BACKUP_SEARCH; 1009 1010 rc = CIFSFindFirst(xid, tcon, full_path, 1011 cifs_sb, NULL, flags, &info, false); 1012 if (rc) 1013 return rc; 1014 1015 *resp_buf = (void *)info.ntwrk_buf_start; 1016 *data = (FILE_ALL_INFO *)info.srch_entries_start; 1017 return 0; 1018 } 1019 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1020 1021 static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb, 1022 struct inode **inode, const char *full_path, 1023 struct cifs_open_info_data *data, struct cifs_fattr *fattr) 1024 { 1025 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1026 struct TCP_Server_Info *server = tcon->ses->server; 1027 int rc; 1028 1029 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { 1030 if (*inode) 1031 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid; 1032 else 1033 fattr->cf_uniqueid = iunique(sb, ROOT_I); 1034 return; 1035 } 1036 1037 /* 1038 * If we have an inode pass a NULL tcon to ensure we don't 1039 * make a round trip to the server. This only works for SMB2+. 1040 */ 1041 rc = server->ops->get_srv_inum(xid, *inode ? NULL : tcon, cifs_sb, full_path, 1042 &fattr->cf_uniqueid, data); 1043 if (rc) { 1044 /* 1045 * If that fails reuse existing ino or generate one 1046 * and disable server ones 1047 */ 1048 if (*inode) 1049 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid; 1050 else { 1051 fattr->cf_uniqueid = iunique(sb, ROOT_I); 1052 cifs_autodisable_serverino(cifs_sb); 1053 } 1054 return; 1055 } 1056 1057 /* If no errors, check for zero root inode (invalid) */ 1058 if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) { 1059 cifs_dbg(FYI, "Invalid (0) inodenum\n"); 1060 if (*inode) { 1061 /* reuse */ 1062 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid; 1063 } else { 1064 /* make an ino by hashing the UNC */ 1065 fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO; 1066 fattr->cf_uniqueid = simple_hashstr(tcon->tree_name); 1067 } 1068 } 1069 } 1070 1071 static inline bool is_inode_cache_good(struct inode *ino) 1072 { 1073 return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0; 1074 } 1075 1076 static int reparse_info_to_fattr(struct cifs_open_info_data *data, 1077 struct super_block *sb, 1078 const unsigned int xid, 1079 struct cifs_tcon *tcon, 1080 const char *full_path, 1081 struct cifs_fattr *fattr) 1082 { 1083 struct TCP_Server_Info *server = tcon->ses->server; 1084 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1085 struct kvec rsp_iov, *iov = NULL; 1086 int rsp_buftype = CIFS_NO_BUFFER; 1087 u32 tag = data->reparse.tag; 1088 int rc = 0; 1089 1090 if (!tag && server->ops->query_reparse_point) { 1091 rc = server->ops->query_reparse_point(xid, tcon, cifs_sb, 1092 full_path, &tag, 1093 &rsp_iov, &rsp_buftype); 1094 if (!rc) 1095 iov = &rsp_iov; 1096 } else if (data->reparse.io.buftype != CIFS_NO_BUFFER && 1097 data->reparse.io.iov.iov_base) { 1098 iov = &data->reparse.io.iov; 1099 } 1100 1101 rc = -EOPNOTSUPP; 1102 data->reparse.tag = tag; 1103 if (!data->reparse.tag) { 1104 if (server->ops->query_symlink) { 1105 rc = server->ops->query_symlink(xid, tcon, 1106 cifs_sb, full_path, 1107 &data->symlink_target); 1108 } 1109 if (rc == -EOPNOTSUPP) 1110 data->reparse.tag = IO_REPARSE_TAG_INTERNAL; 1111 } 1112 1113 switch (data->reparse.tag) { 1114 case 0: /* SMB1 symlink */ 1115 break; 1116 case IO_REPARSE_TAG_INTERNAL: 1117 rc = 0; 1118 if (le32_to_cpu(data->fi.Attributes) & ATTR_DIRECTORY) { 1119 cifs_create_junction_fattr(fattr, sb); 1120 goto out; 1121 } 1122 break; 1123 case IO_REPARSE_TAG_MOUNT_POINT: 1124 cifs_create_junction_fattr(fattr, sb); 1125 rc = 0; 1126 goto out; 1127 default: 1128 /* Check for cached reparse point data */ 1129 if (data->symlink_target || data->reparse.buf) { 1130 rc = 0; 1131 } else if (iov && server->ops->parse_reparse_point) { 1132 rc = server->ops->parse_reparse_point(cifs_sb, 1133 full_path, 1134 iov, data); 1135 } 1136 break; 1137 } 1138 1139 if (tcon->posix_extensions) 1140 smb311_posix_info_to_fattr(fattr, data, sb); 1141 else 1142 cifs_open_info_to_fattr(fattr, data, sb); 1143 out: 1144 fattr->cf_cifstag = data->reparse.tag; 1145 free_rsp_buf(rsp_buftype, rsp_iov.iov_base); 1146 return rc; 1147 } 1148 1149 static int cifs_get_fattr(struct cifs_open_info_data *data, 1150 struct super_block *sb, int xid, 1151 const struct cifs_fid *fid, 1152 struct cifs_fattr *fattr, 1153 struct inode **inode, 1154 const char *full_path) 1155 { 1156 struct cifs_open_info_data tmp_data = {}; 1157 struct cifs_tcon *tcon; 1158 struct TCP_Server_Info *server; 1159 struct tcon_link *tlink; 1160 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1161 void *smb1_backup_rsp_buf = NULL; 1162 int rc = 0; 1163 int tmprc = 0; 1164 1165 tlink = cifs_sb_tlink(cifs_sb); 1166 if (IS_ERR(tlink)) 1167 return PTR_ERR(tlink); 1168 tcon = tlink_tcon(tlink); 1169 server = tcon->ses->server; 1170 1171 /* 1172 * 1. Fetch file metadata if not provided (data) 1173 */ 1174 1175 if (!data) { 1176 rc = server->ops->query_path_info(xid, tcon, cifs_sb, 1177 full_path, &tmp_data); 1178 data = &tmp_data; 1179 } 1180 1181 /* 1182 * 2. Convert it to internal cifs metadata (fattr) 1183 */ 1184 1185 switch (rc) { 1186 case 0: 1187 /* 1188 * If the file is a reparse point, it is more complicated 1189 * since we have to check if its reparse tag matches a known 1190 * special file type e.g. symlink or fifo or char etc. 1191 */ 1192 if (cifs_open_data_reparse(data)) { 1193 rc = reparse_info_to_fattr(data, sb, xid, tcon, 1194 full_path, fattr); 1195 } else { 1196 cifs_open_info_to_fattr(fattr, data, sb); 1197 } 1198 if (!rc && *inode && 1199 (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)) 1200 cifs_mark_open_handles_for_deleted_file(*inode, full_path); 1201 break; 1202 case -EREMOTE: 1203 /* DFS link, no metadata available on this server */ 1204 cifs_create_junction_fattr(fattr, sb); 1205 rc = 0; 1206 break; 1207 case -EACCES: 1208 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1209 /* 1210 * perm errors, try again with backup flags if possible 1211 * 1212 * For SMB2 and later the backup intent flag 1213 * is already sent if needed on open and there 1214 * is no path based FindFirst operation to use 1215 * to retry with 1216 */ 1217 if (backup_cred(cifs_sb) && is_smb1_server(server)) { 1218 /* for easier reading */ 1219 FILE_ALL_INFO *fi; 1220 FILE_DIRECTORY_INFO *fdi; 1221 SEARCH_ID_FULL_DIR_INFO *si; 1222 1223 rc = cifs_backup_query_path_info(xid, tcon, sb, 1224 full_path, 1225 &smb1_backup_rsp_buf, 1226 &fi); 1227 if (rc) 1228 goto out; 1229 1230 move_cifs_info_to_smb2(&data->fi, fi); 1231 fdi = (FILE_DIRECTORY_INFO *)fi; 1232 si = (SEARCH_ID_FULL_DIR_INFO *)fi; 1233 1234 cifs_dir_info_to_fattr(fattr, fdi, cifs_sb); 1235 fattr->cf_uniqueid = le64_to_cpu(si->UniqueId); 1236 /* uniqueid set, skip get inum step */ 1237 goto handle_mnt_opt; 1238 } else { 1239 /* nothing we can do, bail out */ 1240 goto out; 1241 } 1242 #else 1243 goto out; 1244 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1245 break; 1246 default: 1247 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc); 1248 goto out; 1249 } 1250 1251 /* 1252 * 3. Get or update inode number (fattr->cf_uniqueid) 1253 */ 1254 1255 cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, fattr); 1256 1257 /* 1258 * 4. Tweak fattr based on mount options 1259 */ 1260 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1261 handle_mnt_opt: 1262 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1263 /* query for SFU type info if supported and needed */ 1264 if ((fattr->cf_cifsattrs & ATTR_SYSTEM) && 1265 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) { 1266 tmprc = cifs_sfu_type(fattr, full_path, cifs_sb, xid); 1267 if (tmprc) 1268 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc); 1269 } 1270 1271 /* fill in 0777 bits from ACL */ 1272 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) { 1273 rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode, 1274 true, full_path, fid); 1275 if (rc == -EREMOTE) 1276 rc = 0; 1277 if (rc) { 1278 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n", 1279 __func__, rc); 1280 goto out; 1281 } 1282 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) { 1283 rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode, 1284 false, full_path, fid); 1285 if (rc == -EREMOTE) 1286 rc = 0; 1287 if (rc) { 1288 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n", 1289 __func__, rc); 1290 goto out; 1291 } 1292 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) 1293 /* fill in remaining high mode bits e.g. SUID, VTX */ 1294 cifs_sfu_mode(fattr, full_path, cifs_sb, xid); 1295 else if (!(tcon->posix_extensions)) 1296 /* clear write bits if ATTR_READONLY is set */ 1297 if (fattr->cf_cifsattrs & ATTR_READONLY) 1298 fattr->cf_mode &= ~(S_IWUGO); 1299 1300 1301 /* check for Minshall+French symlinks */ 1302 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) { 1303 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path); 1304 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc); 1305 } 1306 1307 out: 1308 cifs_buf_release(smb1_backup_rsp_buf); 1309 cifs_put_tlink(tlink); 1310 cifs_free_open_info(&tmp_data); 1311 return rc; 1312 } 1313 1314 int cifs_get_inode_info(struct inode **inode, 1315 const char *full_path, 1316 struct cifs_open_info_data *data, 1317 struct super_block *sb, int xid, 1318 const struct cifs_fid *fid) 1319 { 1320 struct cifs_fattr fattr = {}; 1321 int rc; 1322 1323 if (is_inode_cache_good(*inode)) { 1324 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n"); 1325 return 0; 1326 } 1327 1328 rc = cifs_get_fattr(data, sb, xid, fid, &fattr, inode, full_path); 1329 if (rc) 1330 goto out; 1331 1332 rc = update_inode_info(sb, &fattr, inode); 1333 out: 1334 kfree(fattr.cf_symlink_target); 1335 return rc; 1336 } 1337 1338 static int smb311_posix_get_fattr(struct cifs_open_info_data *data, 1339 struct cifs_fattr *fattr, 1340 const char *full_path, 1341 struct super_block *sb, 1342 const unsigned int xid) 1343 { 1344 struct cifs_open_info_data tmp_data = {}; 1345 struct TCP_Server_Info *server; 1346 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1347 struct cifs_tcon *tcon; 1348 struct tcon_link *tlink; 1349 int tmprc; 1350 int rc = 0; 1351 1352 tlink = cifs_sb_tlink(cifs_sb); 1353 if (IS_ERR(tlink)) 1354 return PTR_ERR(tlink); 1355 tcon = tlink_tcon(tlink); 1356 server = tcon->ses->server; 1357 1358 /* 1359 * 1. Fetch file metadata if not provided (data) 1360 */ 1361 if (!data) { 1362 rc = server->ops->query_path_info(xid, tcon, cifs_sb, 1363 full_path, &tmp_data); 1364 data = &tmp_data; 1365 } 1366 1367 /* 1368 * 2. Convert it to internal cifs metadata (fattr) 1369 */ 1370 1371 switch (rc) { 1372 case 0: 1373 if (cifs_open_data_reparse(data)) { 1374 rc = reparse_info_to_fattr(data, sb, xid, tcon, 1375 full_path, fattr); 1376 } else { 1377 smb311_posix_info_to_fattr(fattr, data, sb); 1378 } 1379 break; 1380 case -EREMOTE: 1381 /* DFS link, no metadata available on this server */ 1382 cifs_create_junction_fattr(fattr, sb); 1383 rc = 0; 1384 break; 1385 case -EACCES: 1386 /* 1387 * For SMB2 and later the backup intent flag 1388 * is already sent if needed on open and there 1389 * is no path based FindFirst operation to use 1390 * to retry with so nothing we can do, bail out 1391 */ 1392 goto out; 1393 default: 1394 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc); 1395 goto out; 1396 } 1397 1398 /* 1399 * 3. Tweak fattr based on mount options 1400 */ 1401 /* check for Minshall+French symlinks */ 1402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) { 1403 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path); 1404 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc); 1405 } 1406 1407 out: 1408 cifs_put_tlink(tlink); 1409 cifs_free_open_info(data); 1410 return rc; 1411 } 1412 1413 int smb311_posix_get_inode_info(struct inode **inode, 1414 const char *full_path, 1415 struct cifs_open_info_data *data, 1416 struct super_block *sb, 1417 const unsigned int xid) 1418 { 1419 struct cifs_fattr fattr = {}; 1420 int rc; 1421 1422 if (is_inode_cache_good(*inode)) { 1423 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n"); 1424 return 0; 1425 } 1426 1427 rc = smb311_posix_get_fattr(data, &fattr, full_path, sb, xid); 1428 if (rc) 1429 goto out; 1430 1431 rc = update_inode_info(sb, &fattr, inode); 1432 if (!rc && fattr.cf_flags & CIFS_FATTR_DELETE_PENDING) 1433 cifs_mark_open_handles_for_deleted_file(*inode, full_path); 1434 out: 1435 kfree(fattr.cf_symlink_target); 1436 return rc; 1437 } 1438 1439 static const struct inode_operations cifs_ipc_inode_ops = { 1440 .lookup = cifs_lookup, 1441 }; 1442 1443 static int 1444 cifs_find_inode(struct inode *inode, void *opaque) 1445 { 1446 struct cifs_fattr *fattr = opaque; 1447 1448 /* [!] The compared values must be the same in struct cifs_fscache_inode_key. */ 1449 1450 /* don't match inode with different uniqueid */ 1451 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid) 1452 return 0; 1453 1454 /* use createtime like an i_generation field */ 1455 if (CIFS_I(inode)->createtime != fattr->cf_createtime) 1456 return 0; 1457 1458 /* don't match inode of different type */ 1459 if (inode_wrong_type(inode, fattr->cf_mode)) 1460 return 0; 1461 1462 /* if it's not a directory or has no dentries, then flag it */ 1463 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) 1464 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION; 1465 1466 return 1; 1467 } 1468 1469 static int 1470 cifs_init_inode(struct inode *inode, void *opaque) 1471 { 1472 struct cifs_fattr *fattr = opaque; 1473 1474 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid; 1475 CIFS_I(inode)->createtime = fattr->cf_createtime; 1476 return 0; 1477 } 1478 1479 /* 1480 * walk dentry list for an inode and report whether it has aliases that 1481 * are hashed. We use this to determine if a directory inode can actually 1482 * be used. 1483 */ 1484 static bool 1485 inode_has_hashed_dentries(struct inode *inode) 1486 { 1487 struct dentry *dentry; 1488 1489 spin_lock(&inode->i_lock); 1490 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) { 1491 if (!d_unhashed(dentry) || IS_ROOT(dentry)) { 1492 spin_unlock(&inode->i_lock); 1493 return true; 1494 } 1495 } 1496 spin_unlock(&inode->i_lock); 1497 return false; 1498 } 1499 1500 /* Given fattrs, get a corresponding inode */ 1501 struct inode * 1502 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr) 1503 { 1504 unsigned long hash; 1505 struct inode *inode; 1506 1507 retry_iget5_locked: 1508 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid); 1509 1510 /* hash down to 32-bits on 32-bit arch */ 1511 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid); 1512 1513 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr); 1514 if (inode) { 1515 /* was there a potentially problematic inode collision? */ 1516 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) { 1517 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION; 1518 1519 if (inode_has_hashed_dentries(inode)) { 1520 cifs_autodisable_serverino(CIFS_SB(sb)); 1521 iput(inode); 1522 fattr->cf_uniqueid = iunique(sb, ROOT_I); 1523 goto retry_iget5_locked; 1524 } 1525 } 1526 1527 /* can't fail - see cifs_find_inode() */ 1528 cifs_fattr_to_inode(inode, fattr, false); 1529 if (sb->s_flags & SB_NOATIME) 1530 inode->i_flags |= S_NOATIME | S_NOCMTIME; 1531 if (inode->i_state & I_NEW) { 1532 inode->i_ino = hash; 1533 cifs_fscache_get_inode_cookie(inode); 1534 unlock_new_inode(inode); 1535 } 1536 } 1537 1538 return inode; 1539 } 1540 1541 /* gets root inode */ 1542 struct inode *cifs_root_iget(struct super_block *sb) 1543 { 1544 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1545 struct cifs_fattr fattr = {}; 1546 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 1547 struct inode *inode = NULL; 1548 unsigned int xid; 1549 char *path = NULL; 1550 int len; 1551 int rc; 1552 1553 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) 1554 && cifs_sb->prepath) { 1555 len = strlen(cifs_sb->prepath); 1556 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL); 1557 if (path == NULL) 1558 return ERR_PTR(-ENOMEM); 1559 path[0] = '/'; 1560 memcpy(path+1, cifs_sb->prepath, len); 1561 } else { 1562 path = kstrdup("", GFP_KERNEL); 1563 if (path == NULL) 1564 return ERR_PTR(-ENOMEM); 1565 } 1566 1567 xid = get_xid(); 1568 if (tcon->unix_ext) { 1569 rc = cifs_get_unix_fattr(path, sb, &fattr, &inode, xid); 1570 /* some servers mistakenly claim POSIX support */ 1571 if (rc != -EOPNOTSUPP) 1572 goto iget_root; 1573 cifs_dbg(VFS, "server does not support POSIX extensions\n"); 1574 tcon->unix_ext = false; 1575 } 1576 1577 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb)); 1578 if (tcon->posix_extensions) 1579 rc = smb311_posix_get_fattr(NULL, &fattr, path, sb, xid); 1580 else 1581 rc = cifs_get_fattr(NULL, sb, xid, NULL, &fattr, &inode, path); 1582 1583 iget_root: 1584 if (!rc) { 1585 if (fattr.cf_flags & CIFS_FATTR_JUNCTION) { 1586 fattr.cf_flags &= ~CIFS_FATTR_JUNCTION; 1587 cifs_autodisable_serverino(cifs_sb); 1588 } 1589 inode = cifs_iget(sb, &fattr); 1590 } 1591 1592 if (!inode) { 1593 inode = ERR_PTR(rc); 1594 goto out; 1595 } 1596 1597 if (!rc && fattr.cf_flags & CIFS_FATTR_DELETE_PENDING) 1598 cifs_mark_open_handles_for_deleted_file(inode, path); 1599 1600 if (rc && tcon->pipe) { 1601 cifs_dbg(FYI, "ipc connection - fake read inode\n"); 1602 spin_lock(&inode->i_lock); 1603 inode->i_mode |= S_IFDIR; 1604 set_nlink(inode, 2); 1605 inode->i_op = &cifs_ipc_inode_ops; 1606 inode->i_fop = &simple_dir_operations; 1607 inode->i_uid = cifs_sb->ctx->linux_uid; 1608 inode->i_gid = cifs_sb->ctx->linux_gid; 1609 spin_unlock(&inode->i_lock); 1610 } else if (rc) { 1611 iget_failed(inode); 1612 inode = ERR_PTR(rc); 1613 } 1614 1615 out: 1616 kfree(path); 1617 free_xid(xid); 1618 kfree(fattr.cf_symlink_target); 1619 return inode; 1620 } 1621 1622 int 1623 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid, 1624 const char *full_path, __u32 dosattr) 1625 { 1626 bool set_time = false; 1627 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1628 struct TCP_Server_Info *server; 1629 FILE_BASIC_INFO info_buf; 1630 1631 if (attrs == NULL) 1632 return -EINVAL; 1633 1634 server = cifs_sb_master_tcon(cifs_sb)->ses->server; 1635 if (!server->ops->set_file_info) 1636 return -ENOSYS; 1637 1638 info_buf.Pad = 0; 1639 1640 if (attrs->ia_valid & ATTR_ATIME) { 1641 set_time = true; 1642 info_buf.LastAccessTime = 1643 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime)); 1644 } else 1645 info_buf.LastAccessTime = 0; 1646 1647 if (attrs->ia_valid & ATTR_MTIME) { 1648 set_time = true; 1649 info_buf.LastWriteTime = 1650 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime)); 1651 } else 1652 info_buf.LastWriteTime = 0; 1653 1654 /* 1655 * Samba throws this field away, but windows may actually use it. 1656 * Do not set ctime unless other time stamps are changed explicitly 1657 * (i.e. by utimes()) since we would then have a mix of client and 1658 * server times. 1659 */ 1660 if (set_time && (attrs->ia_valid & ATTR_CTIME)) { 1661 cifs_dbg(FYI, "CIFS - CTIME changed\n"); 1662 info_buf.ChangeTime = 1663 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime)); 1664 } else 1665 info_buf.ChangeTime = 0; 1666 1667 info_buf.CreationTime = 0; /* don't change */ 1668 info_buf.Attributes = cpu_to_le32(dosattr); 1669 1670 return server->ops->set_file_info(inode, full_path, &info_buf, xid); 1671 } 1672 1673 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1674 /* 1675 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit 1676 * and rename it to a random name that hopefully won't conflict with 1677 * anything else. 1678 */ 1679 int 1680 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry, 1681 const unsigned int xid) 1682 { 1683 int oplock = 0; 1684 int rc; 1685 struct cifs_fid fid; 1686 struct cifs_open_parms oparms; 1687 struct inode *inode = d_inode(dentry); 1688 struct cifsInodeInfo *cifsInode = CIFS_I(inode); 1689 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1690 struct tcon_link *tlink; 1691 struct cifs_tcon *tcon; 1692 __u32 dosattr, origattr; 1693 FILE_BASIC_INFO *info_buf = NULL; 1694 1695 tlink = cifs_sb_tlink(cifs_sb); 1696 if (IS_ERR(tlink)) 1697 return PTR_ERR(tlink); 1698 tcon = tlink_tcon(tlink); 1699 1700 /* 1701 * We cannot rename the file if the server doesn't support 1702 * CAP_INFOLEVEL_PASSTHRU 1703 */ 1704 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) { 1705 rc = -EBUSY; 1706 goto out; 1707 } 1708 1709 oparms = (struct cifs_open_parms) { 1710 .tcon = tcon, 1711 .cifs_sb = cifs_sb, 1712 .desired_access = DELETE | FILE_WRITE_ATTRIBUTES, 1713 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR), 1714 .disposition = FILE_OPEN, 1715 .path = full_path, 1716 .fid = &fid, 1717 }; 1718 1719 rc = CIFS_open(xid, &oparms, &oplock, NULL); 1720 if (rc != 0) 1721 goto out; 1722 1723 origattr = cifsInode->cifsAttrs; 1724 if (origattr == 0) 1725 origattr |= ATTR_NORMAL; 1726 1727 dosattr = origattr & ~ATTR_READONLY; 1728 if (dosattr == 0) 1729 dosattr |= ATTR_NORMAL; 1730 dosattr |= ATTR_HIDDEN; 1731 1732 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */ 1733 if (dosattr != origattr) { 1734 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL); 1735 if (info_buf == NULL) { 1736 rc = -ENOMEM; 1737 goto out_close; 1738 } 1739 info_buf->Attributes = cpu_to_le32(dosattr); 1740 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid, 1741 current->tgid); 1742 /* although we would like to mark the file hidden 1743 if that fails we will still try to rename it */ 1744 if (!rc) 1745 cifsInode->cifsAttrs = dosattr; 1746 else 1747 dosattr = origattr; /* since not able to change them */ 1748 } 1749 1750 /* rename the file */ 1751 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL, 1752 cifs_sb->local_nls, 1753 cifs_remap(cifs_sb)); 1754 if (rc != 0) { 1755 rc = -EBUSY; 1756 goto undo_setattr; 1757 } 1758 1759 /* try to set DELETE_ON_CLOSE */ 1760 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) { 1761 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid, 1762 current->tgid); 1763 /* 1764 * some samba versions return -ENOENT when we try to set the 1765 * file disposition here. Likely a samba bug, but work around 1766 * it for now. This means that some cifsXXX files may hang 1767 * around after they shouldn't. 1768 * 1769 * BB: remove this hack after more servers have the fix 1770 */ 1771 if (rc == -ENOENT) 1772 rc = 0; 1773 else if (rc != 0) { 1774 rc = -EBUSY; 1775 goto undo_rename; 1776 } 1777 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags); 1778 } 1779 1780 out_close: 1781 CIFSSMBClose(xid, tcon, fid.netfid); 1782 out: 1783 kfree(info_buf); 1784 cifs_put_tlink(tlink); 1785 return rc; 1786 1787 /* 1788 * reset everything back to the original state. Don't bother 1789 * dealing with errors here since we can't do anything about 1790 * them anyway. 1791 */ 1792 undo_rename: 1793 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name, 1794 cifs_sb->local_nls, cifs_remap(cifs_sb)); 1795 undo_setattr: 1796 if (dosattr != origattr) { 1797 info_buf->Attributes = cpu_to_le32(origattr); 1798 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid, 1799 current->tgid)) 1800 cifsInode->cifsAttrs = origattr; 1801 } 1802 1803 goto out_close; 1804 } 1805 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1806 1807 /* copied from fs/nfs/dir.c with small changes */ 1808 static void 1809 cifs_drop_nlink(struct inode *inode) 1810 { 1811 spin_lock(&inode->i_lock); 1812 if (inode->i_nlink > 0) 1813 drop_nlink(inode); 1814 spin_unlock(&inode->i_lock); 1815 } 1816 1817 /* 1818 * If d_inode(dentry) is null (usually meaning the cached dentry 1819 * is a negative dentry) then we would attempt a standard SMB delete, but 1820 * if that fails we can not attempt the fall back mechanisms on EACCES 1821 * but will return the EACCES to the caller. Note that the VFS does not call 1822 * unlink on negative dentries currently. 1823 */ 1824 int cifs_unlink(struct inode *dir, struct dentry *dentry) 1825 { 1826 int rc = 0; 1827 unsigned int xid; 1828 const char *full_path; 1829 void *page; 1830 struct inode *inode = d_inode(dentry); 1831 struct cifsInodeInfo *cifs_inode; 1832 struct super_block *sb = dir->i_sb; 1833 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 1834 struct tcon_link *tlink; 1835 struct cifs_tcon *tcon; 1836 struct TCP_Server_Info *server; 1837 struct iattr *attrs = NULL; 1838 __u32 dosattr = 0, origattr = 0; 1839 1840 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry); 1841 1842 if (unlikely(cifs_forced_shutdown(cifs_sb))) 1843 return -EIO; 1844 1845 tlink = cifs_sb_tlink(cifs_sb); 1846 if (IS_ERR(tlink)) 1847 return PTR_ERR(tlink); 1848 tcon = tlink_tcon(tlink); 1849 server = tcon->ses->server; 1850 1851 xid = get_xid(); 1852 page = alloc_dentry_path(); 1853 1854 if (tcon->nodelete) { 1855 rc = -EACCES; 1856 goto unlink_out; 1857 } 1858 1859 /* Unlink can be called from rename so we can not take the 1860 * sb->s_vfs_rename_mutex here */ 1861 full_path = build_path_from_dentry(dentry, page); 1862 if (IS_ERR(full_path)) { 1863 rc = PTR_ERR(full_path); 1864 goto unlink_out; 1865 } 1866 1867 cifs_close_deferred_file_under_dentry(tcon, full_path); 1868 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1869 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & 1870 le64_to_cpu(tcon->fsUnixInfo.Capability))) { 1871 rc = CIFSPOSIXDelFile(xid, tcon, full_path, 1872 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls, 1873 cifs_remap(cifs_sb)); 1874 cifs_dbg(FYI, "posix del rc %d\n", rc); 1875 if ((rc == 0) || (rc == -ENOENT)) 1876 goto psx_del_no_retry; 1877 } 1878 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1879 1880 retry_std_delete: 1881 if (!server->ops->unlink) { 1882 rc = -ENOSYS; 1883 goto psx_del_no_retry; 1884 } 1885 1886 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb, dentry); 1887 1888 psx_del_no_retry: 1889 if (!rc) { 1890 if (inode) { 1891 cifs_mark_open_handles_for_deleted_file(inode, full_path); 1892 cifs_drop_nlink(inode); 1893 } 1894 } else if (rc == -ENOENT) { 1895 d_drop(dentry); 1896 } else if (rc == -EBUSY) { 1897 if (server->ops->rename_pending_delete) { 1898 rc = server->ops->rename_pending_delete(full_path, 1899 dentry, xid); 1900 if (rc == 0) { 1901 cifs_mark_open_handles_for_deleted_file(inode, full_path); 1902 cifs_drop_nlink(inode); 1903 } 1904 } 1905 } else if ((rc == -EACCES) && (dosattr == 0) && inode) { 1906 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); 1907 if (attrs == NULL) { 1908 rc = -ENOMEM; 1909 goto out_reval; 1910 } 1911 1912 /* try to reset dos attributes */ 1913 cifs_inode = CIFS_I(inode); 1914 origattr = cifs_inode->cifsAttrs; 1915 if (origattr == 0) 1916 origattr |= ATTR_NORMAL; 1917 dosattr = origattr & ~ATTR_READONLY; 1918 if (dosattr == 0) 1919 dosattr |= ATTR_NORMAL; 1920 dosattr |= ATTR_HIDDEN; 1921 1922 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr); 1923 if (rc != 0) 1924 goto out_reval; 1925 1926 goto retry_std_delete; 1927 } 1928 1929 /* undo the setattr if we errored out and it's needed */ 1930 if (rc != 0 && dosattr != 0) 1931 cifs_set_file_info(inode, attrs, xid, full_path, origattr); 1932 1933 out_reval: 1934 if (inode) { 1935 cifs_inode = CIFS_I(inode); 1936 cifs_inode->time = 0; /* will force revalidate to get info 1937 when needed */ 1938 inode_set_ctime_current(inode); 1939 } 1940 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1941 cifs_inode = CIFS_I(dir); 1942 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */ 1943 unlink_out: 1944 free_dentry_path(page); 1945 kfree(attrs); 1946 free_xid(xid); 1947 cifs_put_tlink(tlink); 1948 return rc; 1949 } 1950 1951 static int 1952 cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode, 1953 const char *full_path, struct cifs_sb_info *cifs_sb, 1954 struct cifs_tcon *tcon, const unsigned int xid) 1955 { 1956 int rc = 0; 1957 struct inode *inode = NULL; 1958 1959 if (tcon->posix_extensions) { 1960 rc = smb311_posix_get_inode_info(&inode, full_path, 1961 NULL, parent->i_sb, xid); 1962 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1963 } else if (tcon->unix_ext) { 1964 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb, 1965 xid); 1966 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1967 } else { 1968 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb, 1969 xid, NULL); 1970 } 1971 1972 if (rc) 1973 return rc; 1974 1975 if (!S_ISDIR(inode->i_mode)) { 1976 /* 1977 * mkdir succeeded, but another client has managed to remove the 1978 * sucker and replace it with non-directory. Return success, 1979 * but don't leave the child in dcache. 1980 */ 1981 iput(inode); 1982 d_drop(dentry); 1983 return 0; 1984 } 1985 /* 1986 * setting nlink not necessary except in cases where we failed to get it 1987 * from the server or was set bogus. Also, since this is a brand new 1988 * inode, no need to grab the i_lock before setting the i_nlink. 1989 */ 1990 if (inode->i_nlink < 2) 1991 set_nlink(inode, 2); 1992 mode &= ~current_umask(); 1993 /* must turn on setgid bit if parent dir has it */ 1994 if (parent->i_mode & S_ISGID) 1995 mode |= S_ISGID; 1996 1997 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1998 if (tcon->unix_ext) { 1999 struct cifs_unix_set_info_args args = { 2000 .mode = mode, 2001 .ctime = NO_CHANGE_64, 2002 .atime = NO_CHANGE_64, 2003 .mtime = NO_CHANGE_64, 2004 .device = 0, 2005 }; 2006 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { 2007 args.uid = current_fsuid(); 2008 if (parent->i_mode & S_ISGID) 2009 args.gid = parent->i_gid; 2010 else 2011 args.gid = current_fsgid(); 2012 } else { 2013 args.uid = INVALID_UID; /* no change */ 2014 args.gid = INVALID_GID; /* no change */ 2015 } 2016 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, 2017 cifs_sb->local_nls, 2018 cifs_remap(cifs_sb)); 2019 } else { 2020 #else 2021 { 2022 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2023 struct TCP_Server_Info *server = tcon->ses->server; 2024 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) && 2025 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo) 2026 server->ops->mkdir_setinfo(inode, full_path, cifs_sb, 2027 tcon, xid); 2028 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) 2029 inode->i_mode = (mode | S_IFDIR); 2030 2031 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { 2032 inode->i_uid = current_fsuid(); 2033 if (inode->i_mode & S_ISGID) 2034 inode->i_gid = parent->i_gid; 2035 else 2036 inode->i_gid = current_fsgid(); 2037 } 2038 } 2039 d_instantiate(dentry, inode); 2040 return 0; 2041 } 2042 2043 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2044 static int 2045 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode, 2046 const char *full_path, struct cifs_sb_info *cifs_sb, 2047 struct cifs_tcon *tcon, const unsigned int xid) 2048 { 2049 int rc = 0; 2050 u32 oplock = 0; 2051 FILE_UNIX_BASIC_INFO *info = NULL; 2052 struct inode *newinode = NULL; 2053 struct cifs_fattr fattr; 2054 2055 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); 2056 if (info == NULL) { 2057 rc = -ENOMEM; 2058 goto posix_mkdir_out; 2059 } 2060 2061 mode &= ~current_umask(); 2062 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode, 2063 NULL /* netfid */, info, &oplock, full_path, 2064 cifs_sb->local_nls, cifs_remap(cifs_sb)); 2065 if (rc == -EOPNOTSUPP) 2066 goto posix_mkdir_out; 2067 else if (rc) { 2068 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc); 2069 d_drop(dentry); 2070 goto posix_mkdir_out; 2071 } 2072 2073 if (info->Type == cpu_to_le32(-1)) 2074 /* no return info, go query for it */ 2075 goto posix_mkdir_get_info; 2076 /* 2077 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if 2078 * need to set uid/gid. 2079 */ 2080 2081 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb); 2082 cifs_fill_uniqueid(inode->i_sb, &fattr); 2083 newinode = cifs_iget(inode->i_sb, &fattr); 2084 if (!newinode) 2085 goto posix_mkdir_get_info; 2086 2087 d_instantiate(dentry, newinode); 2088 2089 #ifdef CONFIG_CIFS_DEBUG2 2090 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n", 2091 dentry, dentry, newinode); 2092 2093 if (newinode->i_nlink != 2) 2094 cifs_dbg(FYI, "unexpected number of links %d\n", 2095 newinode->i_nlink); 2096 #endif 2097 2098 posix_mkdir_out: 2099 kfree(info); 2100 return rc; 2101 posix_mkdir_get_info: 2102 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon, 2103 xid); 2104 goto posix_mkdir_out; 2105 } 2106 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2107 2108 int cifs_mkdir(struct mnt_idmap *idmap, struct inode *inode, 2109 struct dentry *direntry, umode_t mode) 2110 { 2111 int rc = 0; 2112 unsigned int xid; 2113 struct cifs_sb_info *cifs_sb; 2114 struct tcon_link *tlink; 2115 struct cifs_tcon *tcon; 2116 struct TCP_Server_Info *server; 2117 const char *full_path; 2118 void *page; 2119 2120 cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n", 2121 mode, inode); 2122 2123 cifs_sb = CIFS_SB(inode->i_sb); 2124 if (unlikely(cifs_forced_shutdown(cifs_sb))) 2125 return -EIO; 2126 tlink = cifs_sb_tlink(cifs_sb); 2127 if (IS_ERR(tlink)) 2128 return PTR_ERR(tlink); 2129 tcon = tlink_tcon(tlink); 2130 2131 xid = get_xid(); 2132 2133 page = alloc_dentry_path(); 2134 full_path = build_path_from_dentry(direntry, page); 2135 if (IS_ERR(full_path)) { 2136 rc = PTR_ERR(full_path); 2137 goto mkdir_out; 2138 } 2139 2140 server = tcon->ses->server; 2141 2142 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) { 2143 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path, 2144 cifs_sb); 2145 d_drop(direntry); /* for time being always refresh inode info */ 2146 goto mkdir_out; 2147 } 2148 2149 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2150 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & 2151 le64_to_cpu(tcon->fsUnixInfo.Capability))) { 2152 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb, 2153 tcon, xid); 2154 if (rc != -EOPNOTSUPP) 2155 goto mkdir_out; 2156 } 2157 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2158 2159 if (!server->ops->mkdir) { 2160 rc = -ENOSYS; 2161 goto mkdir_out; 2162 } 2163 2164 /* BB add setting the equivalent of mode via CreateX w/ACLs */ 2165 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb); 2166 if (rc) { 2167 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc); 2168 d_drop(direntry); 2169 goto mkdir_out; 2170 } 2171 2172 /* TODO: skip this for smb2/smb3 */ 2173 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon, 2174 xid); 2175 mkdir_out: 2176 /* 2177 * Force revalidate to get parent dir info when needed since cached 2178 * attributes are invalid now. 2179 */ 2180 CIFS_I(inode)->time = 0; 2181 free_dentry_path(page); 2182 free_xid(xid); 2183 cifs_put_tlink(tlink); 2184 return rc; 2185 } 2186 2187 int cifs_rmdir(struct inode *inode, struct dentry *direntry) 2188 { 2189 int rc = 0; 2190 unsigned int xid; 2191 struct cifs_sb_info *cifs_sb; 2192 struct tcon_link *tlink; 2193 struct cifs_tcon *tcon; 2194 struct TCP_Server_Info *server; 2195 const char *full_path; 2196 void *page = alloc_dentry_path(); 2197 struct cifsInodeInfo *cifsInode; 2198 2199 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode); 2200 2201 xid = get_xid(); 2202 2203 full_path = build_path_from_dentry(direntry, page); 2204 if (IS_ERR(full_path)) { 2205 rc = PTR_ERR(full_path); 2206 goto rmdir_exit; 2207 } 2208 2209 cifs_sb = CIFS_SB(inode->i_sb); 2210 if (unlikely(cifs_forced_shutdown(cifs_sb))) { 2211 rc = -EIO; 2212 goto rmdir_exit; 2213 } 2214 2215 tlink = cifs_sb_tlink(cifs_sb); 2216 if (IS_ERR(tlink)) { 2217 rc = PTR_ERR(tlink); 2218 goto rmdir_exit; 2219 } 2220 tcon = tlink_tcon(tlink); 2221 server = tcon->ses->server; 2222 2223 if (!server->ops->rmdir) { 2224 rc = -ENOSYS; 2225 cifs_put_tlink(tlink); 2226 goto rmdir_exit; 2227 } 2228 2229 if (tcon->nodelete) { 2230 rc = -EACCES; 2231 cifs_put_tlink(tlink); 2232 goto rmdir_exit; 2233 } 2234 2235 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb); 2236 cifs_put_tlink(tlink); 2237 2238 if (!rc) { 2239 spin_lock(&d_inode(direntry)->i_lock); 2240 i_size_write(d_inode(direntry), 0); 2241 clear_nlink(d_inode(direntry)); 2242 spin_unlock(&d_inode(direntry)->i_lock); 2243 } 2244 2245 cifsInode = CIFS_I(d_inode(direntry)); 2246 /* force revalidate to go get info when needed */ 2247 cifsInode->time = 0; 2248 2249 cifsInode = CIFS_I(inode); 2250 /* 2251 * Force revalidate to get parent dir info when needed since cached 2252 * attributes are invalid now. 2253 */ 2254 cifsInode->time = 0; 2255 2256 inode_set_ctime_current(d_inode(direntry)); 2257 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); 2258 2259 rmdir_exit: 2260 free_dentry_path(page); 2261 free_xid(xid); 2262 return rc; 2263 } 2264 2265 static int 2266 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry, 2267 const char *from_path, struct dentry *to_dentry, 2268 const char *to_path) 2269 { 2270 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb); 2271 struct tcon_link *tlink; 2272 struct cifs_tcon *tcon; 2273 struct TCP_Server_Info *server; 2274 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2275 struct cifs_fid fid; 2276 struct cifs_open_parms oparms; 2277 int oplock; 2278 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2279 int rc; 2280 2281 tlink = cifs_sb_tlink(cifs_sb); 2282 if (IS_ERR(tlink)) 2283 return PTR_ERR(tlink); 2284 tcon = tlink_tcon(tlink); 2285 server = tcon->ses->server; 2286 2287 if (!server->ops->rename) 2288 return -ENOSYS; 2289 2290 /* try path-based rename first */ 2291 rc = server->ops->rename(xid, tcon, from_dentry, 2292 from_path, to_path, cifs_sb); 2293 2294 /* 2295 * Don't bother with rename by filehandle unless file is busy and 2296 * source. Note that cross directory moves do not work with 2297 * rename by filehandle to various Windows servers. 2298 */ 2299 if (rc == 0 || rc != -EBUSY) 2300 goto do_rename_exit; 2301 2302 /* Don't fall back to using SMB on SMB 2+ mount */ 2303 if (server->vals->protocol_id != 0) 2304 goto do_rename_exit; 2305 2306 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2307 /* open-file renames don't work across directories */ 2308 if (to_dentry->d_parent != from_dentry->d_parent) 2309 goto do_rename_exit; 2310 2311 oparms = (struct cifs_open_parms) { 2312 .tcon = tcon, 2313 .cifs_sb = cifs_sb, 2314 /* open the file to be renamed -- we need DELETE perms */ 2315 .desired_access = DELETE, 2316 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR), 2317 .disposition = FILE_OPEN, 2318 .path = from_path, 2319 .fid = &fid, 2320 }; 2321 2322 rc = CIFS_open(xid, &oparms, &oplock, NULL); 2323 if (rc == 0) { 2324 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, 2325 (const char *) to_dentry->d_name.name, 2326 cifs_sb->local_nls, cifs_remap(cifs_sb)); 2327 CIFSSMBClose(xid, tcon, fid.netfid); 2328 } 2329 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2330 do_rename_exit: 2331 if (rc == 0) 2332 d_move(from_dentry, to_dentry); 2333 cifs_put_tlink(tlink); 2334 return rc; 2335 } 2336 2337 int 2338 cifs_rename2(struct mnt_idmap *idmap, struct inode *source_dir, 2339 struct dentry *source_dentry, struct inode *target_dir, 2340 struct dentry *target_dentry, unsigned int flags) 2341 { 2342 const char *from_name, *to_name; 2343 void *page1, *page2; 2344 struct cifs_sb_info *cifs_sb; 2345 struct tcon_link *tlink; 2346 struct cifs_tcon *tcon; 2347 unsigned int xid; 2348 int rc, tmprc; 2349 int retry_count = 0; 2350 FILE_UNIX_BASIC_INFO *info_buf_source = NULL; 2351 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2352 FILE_UNIX_BASIC_INFO *info_buf_target; 2353 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2354 2355 if (flags & ~RENAME_NOREPLACE) 2356 return -EINVAL; 2357 2358 cifs_sb = CIFS_SB(source_dir->i_sb); 2359 if (unlikely(cifs_forced_shutdown(cifs_sb))) 2360 return -EIO; 2361 2362 tlink = cifs_sb_tlink(cifs_sb); 2363 if (IS_ERR(tlink)) 2364 return PTR_ERR(tlink); 2365 tcon = tlink_tcon(tlink); 2366 2367 page1 = alloc_dentry_path(); 2368 page2 = alloc_dentry_path(); 2369 xid = get_xid(); 2370 2371 from_name = build_path_from_dentry(source_dentry, page1); 2372 if (IS_ERR(from_name)) { 2373 rc = PTR_ERR(from_name); 2374 goto cifs_rename_exit; 2375 } 2376 2377 to_name = build_path_from_dentry(target_dentry, page2); 2378 if (IS_ERR(to_name)) { 2379 rc = PTR_ERR(to_name); 2380 goto cifs_rename_exit; 2381 } 2382 2383 cifs_close_deferred_file_under_dentry(tcon, from_name); 2384 if (d_inode(target_dentry) != NULL) 2385 cifs_close_deferred_file_under_dentry(tcon, to_name); 2386 2387 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry, 2388 to_name); 2389 2390 if (rc == -EACCES) { 2391 while (retry_count < 3) { 2392 cifs_close_all_deferred_files(tcon); 2393 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry, 2394 to_name); 2395 if (rc != -EACCES) 2396 break; 2397 retry_count++; 2398 } 2399 } 2400 2401 /* 2402 * No-replace is the natural behavior for CIFS, so skip unlink hacks. 2403 */ 2404 if (flags & RENAME_NOREPLACE) 2405 goto cifs_rename_exit; 2406 2407 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2408 if (rc == -EEXIST && tcon->unix_ext) { 2409 /* 2410 * Are src and dst hardlinks of same inode? We can only tell 2411 * with unix extensions enabled. 2412 */ 2413 info_buf_source = 2414 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO), 2415 GFP_KERNEL); 2416 if (info_buf_source == NULL) { 2417 rc = -ENOMEM; 2418 goto cifs_rename_exit; 2419 } 2420 2421 info_buf_target = info_buf_source + 1; 2422 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name, 2423 info_buf_source, 2424 cifs_sb->local_nls, 2425 cifs_remap(cifs_sb)); 2426 if (tmprc != 0) 2427 goto unlink_target; 2428 2429 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name, 2430 info_buf_target, 2431 cifs_sb->local_nls, 2432 cifs_remap(cifs_sb)); 2433 2434 if (tmprc == 0 && (info_buf_source->UniqueId == 2435 info_buf_target->UniqueId)) { 2436 /* same file, POSIX says that this is a noop */ 2437 rc = 0; 2438 goto cifs_rename_exit; 2439 } 2440 } 2441 /* 2442 * else ... BB we could add the same check for Windows by 2443 * checking the UniqueId via FILE_INTERNAL_INFO 2444 */ 2445 2446 unlink_target: 2447 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2448 2449 /* Try unlinking the target dentry if it's not negative */ 2450 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) { 2451 if (d_is_dir(target_dentry)) 2452 tmprc = cifs_rmdir(target_dir, target_dentry); 2453 else 2454 tmprc = cifs_unlink(target_dir, target_dentry); 2455 if (tmprc) 2456 goto cifs_rename_exit; 2457 rc = cifs_do_rename(xid, source_dentry, from_name, 2458 target_dentry, to_name); 2459 } 2460 2461 /* force revalidate to go get info when needed */ 2462 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0; 2463 2464 cifs_rename_exit: 2465 kfree(info_buf_source); 2466 free_dentry_path(page2); 2467 free_dentry_path(page1); 2468 free_xid(xid); 2469 cifs_put_tlink(tlink); 2470 return rc; 2471 } 2472 2473 static bool 2474 cifs_dentry_needs_reval(struct dentry *dentry) 2475 { 2476 struct inode *inode = d_inode(dentry); 2477 struct cifsInodeInfo *cifs_i = CIFS_I(inode); 2478 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2479 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 2480 struct cached_fid *cfid = NULL; 2481 2482 if (cifs_i->time == 0) 2483 return true; 2484 2485 if (CIFS_CACHE_READ(cifs_i)) 2486 return false; 2487 2488 if (!lookupCacheEnabled) 2489 return true; 2490 2491 if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) { 2492 if (cfid->time && cifs_i->time > cfid->time) { 2493 close_cached_dir(cfid); 2494 return false; 2495 } 2496 close_cached_dir(cfid); 2497 } 2498 /* 2499 * depending on inode type, check if attribute caching disabled for 2500 * files or directories 2501 */ 2502 if (S_ISDIR(inode->i_mode)) { 2503 if (!cifs_sb->ctx->acdirmax) 2504 return true; 2505 if (!time_in_range(jiffies, cifs_i->time, 2506 cifs_i->time + cifs_sb->ctx->acdirmax)) 2507 return true; 2508 } else { /* file */ 2509 if (!cifs_sb->ctx->acregmax) 2510 return true; 2511 if (!time_in_range(jiffies, cifs_i->time, 2512 cifs_i->time + cifs_sb->ctx->acregmax)) 2513 return true; 2514 } 2515 2516 /* hardlinked files w/ noserverino get "special" treatment */ 2517 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) && 2518 S_ISREG(inode->i_mode) && inode->i_nlink != 1) 2519 return true; 2520 2521 return false; 2522 } 2523 2524 /* 2525 * Zap the cache. Called when invalid_mapping flag is set. 2526 */ 2527 int 2528 cifs_invalidate_mapping(struct inode *inode) 2529 { 2530 int rc = 0; 2531 2532 if (inode->i_mapping && inode->i_mapping->nrpages != 0) { 2533 rc = invalidate_inode_pages2(inode->i_mapping); 2534 if (rc) 2535 cifs_dbg(VFS, "%s: invalidate inode %p failed with rc %d\n", 2536 __func__, inode, rc); 2537 } 2538 2539 return rc; 2540 } 2541 2542 /** 2543 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks 2544 * 2545 * @key: currently unused 2546 * @mode: the task state to sleep in 2547 */ 2548 static int 2549 cifs_wait_bit_killable(struct wait_bit_key *key, int mode) 2550 { 2551 schedule(); 2552 if (signal_pending_state(mode, current)) 2553 return -ERESTARTSYS; 2554 return 0; 2555 } 2556 2557 int 2558 cifs_revalidate_mapping(struct inode *inode) 2559 { 2560 int rc; 2561 unsigned long *flags = &CIFS_I(inode)->flags; 2562 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2563 2564 /* swapfiles are not supposed to be shared */ 2565 if (IS_SWAPFILE(inode)) 2566 return 0; 2567 2568 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable, 2569 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 2570 if (rc) 2571 return rc; 2572 2573 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) { 2574 /* for cache=singleclient, do not invalidate */ 2575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE) 2576 goto skip_invalidate; 2577 2578 rc = cifs_invalidate_mapping(inode); 2579 if (rc) 2580 set_bit(CIFS_INO_INVALID_MAPPING, flags); 2581 } 2582 2583 skip_invalidate: 2584 clear_bit_unlock(CIFS_INO_LOCK, flags); 2585 smp_mb__after_atomic(); 2586 wake_up_bit(flags, CIFS_INO_LOCK); 2587 2588 return rc; 2589 } 2590 2591 int 2592 cifs_zap_mapping(struct inode *inode) 2593 { 2594 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags); 2595 return cifs_revalidate_mapping(inode); 2596 } 2597 2598 int cifs_revalidate_file_attr(struct file *filp) 2599 { 2600 int rc = 0; 2601 struct dentry *dentry = file_dentry(filp); 2602 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2603 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data; 2604 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2605 2606 if (!cifs_dentry_needs_reval(dentry)) 2607 return rc; 2608 2609 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2610 if (tlink_tcon(cfile->tlink)->unix_ext) 2611 rc = cifs_get_file_info_unix(filp); 2612 else 2613 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2614 rc = cifs_get_file_info(filp); 2615 2616 return rc; 2617 } 2618 2619 int cifs_revalidate_dentry_attr(struct dentry *dentry) 2620 { 2621 unsigned int xid; 2622 int rc = 0; 2623 struct inode *inode = d_inode(dentry); 2624 struct super_block *sb = dentry->d_sb; 2625 const char *full_path; 2626 void *page; 2627 int count = 0; 2628 2629 if (inode == NULL) 2630 return -ENOENT; 2631 2632 if (!cifs_dentry_needs_reval(dentry)) 2633 return rc; 2634 2635 xid = get_xid(); 2636 2637 page = alloc_dentry_path(); 2638 full_path = build_path_from_dentry(dentry, page); 2639 if (IS_ERR(full_path)) { 2640 rc = PTR_ERR(full_path); 2641 goto out; 2642 } 2643 2644 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n", 2645 full_path, inode, inode->i_count.counter, 2646 dentry, cifs_get_time(dentry), jiffies); 2647 2648 again: 2649 if (cifs_sb_master_tcon(CIFS_SB(sb))->posix_extensions) { 2650 rc = smb311_posix_get_inode_info(&inode, full_path, 2651 NULL, sb, xid); 2652 } else if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext) { 2653 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid); 2654 } else { 2655 rc = cifs_get_inode_info(&inode, full_path, NULL, sb, 2656 xid, NULL); 2657 } 2658 if (rc == -EAGAIN && count++ < 10) 2659 goto again; 2660 out: 2661 free_dentry_path(page); 2662 free_xid(xid); 2663 2664 return rc; 2665 } 2666 2667 int cifs_revalidate_file(struct file *filp) 2668 { 2669 int rc; 2670 struct inode *inode = file_inode(filp); 2671 2672 rc = cifs_revalidate_file_attr(filp); 2673 if (rc) 2674 return rc; 2675 2676 return cifs_revalidate_mapping(inode); 2677 } 2678 2679 /* revalidate a dentry's inode attributes */ 2680 int cifs_revalidate_dentry(struct dentry *dentry) 2681 { 2682 int rc; 2683 struct inode *inode = d_inode(dentry); 2684 2685 rc = cifs_revalidate_dentry_attr(dentry); 2686 if (rc) 2687 return rc; 2688 2689 return cifs_revalidate_mapping(inode); 2690 } 2691 2692 int cifs_getattr(struct mnt_idmap *idmap, const struct path *path, 2693 struct kstat *stat, u32 request_mask, unsigned int flags) 2694 { 2695 struct dentry *dentry = path->dentry; 2696 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb); 2697 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 2698 struct inode *inode = d_inode(dentry); 2699 int rc; 2700 2701 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) 2702 return -EIO; 2703 2704 /* 2705 * We need to be sure that all dirty pages are written and the server 2706 * has actual ctime, mtime and file length. 2707 */ 2708 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) && 2709 !CIFS_CACHE_READ(CIFS_I(inode)) && 2710 inode->i_mapping && inode->i_mapping->nrpages != 0) { 2711 rc = filemap_fdatawait(inode->i_mapping); 2712 if (rc) { 2713 mapping_set_error(inode->i_mapping, rc); 2714 return rc; 2715 } 2716 } 2717 2718 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_FORCE_SYNC) 2719 CIFS_I(inode)->time = 0; /* force revalidate */ 2720 2721 /* 2722 * If the caller doesn't require syncing, only sync if 2723 * necessary (e.g. due to earlier truncate or setattr 2724 * invalidating the cached metadata) 2725 */ 2726 if (((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) || 2727 (CIFS_I(inode)->time == 0)) { 2728 rc = cifs_revalidate_dentry_attr(dentry); 2729 if (rc) 2730 return rc; 2731 } 2732 2733 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2734 stat->blksize = cifs_sb->ctx->bsize; 2735 stat->ino = CIFS_I(inode)->uniqueid; 2736 2737 /* old CIFS Unix Extensions doesn't return create time */ 2738 if (CIFS_I(inode)->createtime) { 2739 stat->result_mask |= STATX_BTIME; 2740 stat->btime = 2741 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime)); 2742 } 2743 2744 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED); 2745 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED) 2746 stat->attributes |= STATX_ATTR_COMPRESSED; 2747 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED) 2748 stat->attributes |= STATX_ATTR_ENCRYPTED; 2749 2750 /* 2751 * If on a multiuser mount without unix extensions or cifsacl being 2752 * enabled, and the admin hasn't overridden them, set the ownership 2753 * to the fsuid/fsgid of the current process. 2754 */ 2755 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) && 2756 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) && 2757 !tcon->unix_ext) { 2758 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) 2759 stat->uid = current_fsuid(); 2760 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) 2761 stat->gid = current_fsgid(); 2762 } 2763 return 0; 2764 } 2765 2766 int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start, 2767 u64 len) 2768 { 2769 struct cifsInodeInfo *cifs_i = CIFS_I(inode); 2770 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->netfs.inode.i_sb); 2771 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); 2772 struct TCP_Server_Info *server = tcon->ses->server; 2773 struct cifsFileInfo *cfile; 2774 int rc; 2775 2776 if (unlikely(cifs_forced_shutdown(cifs_sb))) 2777 return -EIO; 2778 2779 /* 2780 * We need to be sure that all dirty pages are written as they 2781 * might fill holes on the server. 2782 */ 2783 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping && 2784 inode->i_mapping->nrpages != 0) { 2785 rc = filemap_fdatawait(inode->i_mapping); 2786 if (rc) { 2787 mapping_set_error(inode->i_mapping, rc); 2788 return rc; 2789 } 2790 } 2791 2792 cfile = find_readable_file(cifs_i, false); 2793 if (cfile == NULL) 2794 return -EINVAL; 2795 2796 if (server->ops->fiemap) { 2797 rc = server->ops->fiemap(tcon, cfile, fei, start, len); 2798 cifsFileInfo_put(cfile); 2799 return rc; 2800 } 2801 2802 cifsFileInfo_put(cfile); 2803 return -EOPNOTSUPP; 2804 } 2805 2806 int cifs_truncate_page(struct address_space *mapping, loff_t from) 2807 { 2808 pgoff_t index = from >> PAGE_SHIFT; 2809 unsigned offset = from & (PAGE_SIZE - 1); 2810 struct page *page; 2811 int rc = 0; 2812 2813 page = grab_cache_page(mapping, index); 2814 if (!page) 2815 return -ENOMEM; 2816 2817 zero_user_segment(page, offset, PAGE_SIZE); 2818 unlock_page(page); 2819 put_page(page); 2820 return rc; 2821 } 2822 2823 void cifs_setsize(struct inode *inode, loff_t offset) 2824 { 2825 struct cifsInodeInfo *cifs_i = CIFS_I(inode); 2826 2827 spin_lock(&inode->i_lock); 2828 i_size_write(inode, offset); 2829 spin_unlock(&inode->i_lock); 2830 2831 /* Cached inode must be refreshed on truncate */ 2832 cifs_i->time = 0; 2833 truncate_pagecache(inode, offset); 2834 } 2835 2836 static int 2837 cifs_set_file_size(struct inode *inode, struct iattr *attrs, 2838 unsigned int xid, const char *full_path, struct dentry *dentry) 2839 { 2840 int rc; 2841 struct cifsFileInfo *open_file; 2842 struct cifsInodeInfo *cifsInode = CIFS_I(inode); 2843 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2844 struct tcon_link *tlink = NULL; 2845 struct cifs_tcon *tcon = NULL; 2846 struct TCP_Server_Info *server; 2847 2848 /* 2849 * To avoid spurious oplock breaks from server, in the case of 2850 * inodes that we already have open, avoid doing path based 2851 * setting of file size if we can do it by handle. 2852 * This keeps our caching token (oplock) and avoids timeouts 2853 * when the local oplock break takes longer to flush 2854 * writebehind data than the SMB timeout for the SetPathInfo 2855 * request would allow 2856 */ 2857 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY); 2858 if (open_file) { 2859 tcon = tlink_tcon(open_file->tlink); 2860 server = tcon->ses->server; 2861 if (server->ops->set_file_size) 2862 rc = server->ops->set_file_size(xid, tcon, open_file, 2863 attrs->ia_size, false); 2864 else 2865 rc = -ENOSYS; 2866 cifsFileInfo_put(open_file); 2867 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc); 2868 } else 2869 rc = -EINVAL; 2870 2871 if (!rc) 2872 goto set_size_out; 2873 2874 if (tcon == NULL) { 2875 tlink = cifs_sb_tlink(cifs_sb); 2876 if (IS_ERR(tlink)) 2877 return PTR_ERR(tlink); 2878 tcon = tlink_tcon(tlink); 2879 server = tcon->ses->server; 2880 } 2881 2882 /* 2883 * Set file size by pathname rather than by handle either because no 2884 * valid, writeable file handle for it was found or because there was 2885 * an error setting it by handle. 2886 */ 2887 if (server->ops->set_path_size) 2888 rc = server->ops->set_path_size(xid, tcon, full_path, 2889 attrs->ia_size, cifs_sb, false, dentry); 2890 else 2891 rc = -ENOSYS; 2892 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc); 2893 2894 if (tlink) 2895 cifs_put_tlink(tlink); 2896 2897 set_size_out: 2898 if (rc == 0) { 2899 cifsInode->server_eof = attrs->ia_size; 2900 cifs_setsize(inode, attrs->ia_size); 2901 /* 2902 * i_blocks is not related to (i_size / i_blksize), but instead 2903 * 512 byte (2**9) size is required for calculating num blocks. 2904 * Until we can query the server for actual allocation size, 2905 * this is best estimate we have for blocks allocated for a file 2906 * Number of blocks must be rounded up so size 1 is not 0 blocks 2907 */ 2908 inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9; 2909 2910 /* 2911 * The man page of truncate says if the size changed, 2912 * then the st_ctime and st_mtime fields for the file 2913 * are updated. 2914 */ 2915 attrs->ia_ctime = attrs->ia_mtime = current_time(inode); 2916 attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME; 2917 2918 cifs_truncate_page(inode->i_mapping, inode->i_size); 2919 } 2920 2921 return rc; 2922 } 2923 2924 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2925 static int 2926 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs) 2927 { 2928 int rc; 2929 unsigned int xid; 2930 const char *full_path; 2931 void *page = alloc_dentry_path(); 2932 struct inode *inode = d_inode(direntry); 2933 struct cifsInodeInfo *cifsInode = CIFS_I(inode); 2934 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 2935 struct tcon_link *tlink; 2936 struct cifs_tcon *pTcon; 2937 struct cifs_unix_set_info_args *args = NULL; 2938 struct cifsFileInfo *open_file; 2939 2940 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n", 2941 direntry, attrs->ia_valid); 2942 2943 xid = get_xid(); 2944 2945 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) 2946 attrs->ia_valid |= ATTR_FORCE; 2947 2948 rc = setattr_prepare(&nop_mnt_idmap, direntry, attrs); 2949 if (rc < 0) 2950 goto out; 2951 2952 full_path = build_path_from_dentry(direntry, page); 2953 if (IS_ERR(full_path)) { 2954 rc = PTR_ERR(full_path); 2955 goto out; 2956 } 2957 2958 /* 2959 * Attempt to flush data before changing attributes. We need to do 2960 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the 2961 * ownership or mode then we may also need to do this. Here, we take 2962 * the safe way out and just do the flush on all setattr requests. If 2963 * the flush returns error, store it to report later and continue. 2964 * 2965 * BB: This should be smarter. Why bother flushing pages that 2966 * will be truncated anyway? Also, should we error out here if 2967 * the flush returns error? 2968 */ 2969 rc = filemap_write_and_wait(inode->i_mapping); 2970 if (is_interrupt_error(rc)) { 2971 rc = -ERESTARTSYS; 2972 goto out; 2973 } 2974 2975 mapping_set_error(inode->i_mapping, rc); 2976 rc = 0; 2977 2978 if (attrs->ia_valid & ATTR_SIZE) { 2979 rc = cifs_set_file_size(inode, attrs, xid, full_path, direntry); 2980 if (rc != 0) 2981 goto out; 2982 } 2983 2984 /* skip mode change if it's just for clearing setuid/setgid */ 2985 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) 2986 attrs->ia_valid &= ~ATTR_MODE; 2987 2988 args = kmalloc(sizeof(*args), GFP_KERNEL); 2989 if (args == NULL) { 2990 rc = -ENOMEM; 2991 goto out; 2992 } 2993 2994 /* set up the struct */ 2995 if (attrs->ia_valid & ATTR_MODE) 2996 args->mode = attrs->ia_mode; 2997 else 2998 args->mode = NO_CHANGE_64; 2999 3000 if (attrs->ia_valid & ATTR_UID) 3001 args->uid = attrs->ia_uid; 3002 else 3003 args->uid = INVALID_UID; /* no change */ 3004 3005 if (attrs->ia_valid & ATTR_GID) 3006 args->gid = attrs->ia_gid; 3007 else 3008 args->gid = INVALID_GID; /* no change */ 3009 3010 if (attrs->ia_valid & ATTR_ATIME) 3011 args->atime = cifs_UnixTimeToNT(attrs->ia_atime); 3012 else 3013 args->atime = NO_CHANGE_64; 3014 3015 if (attrs->ia_valid & ATTR_MTIME) 3016 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime); 3017 else 3018 args->mtime = NO_CHANGE_64; 3019 3020 if (attrs->ia_valid & ATTR_CTIME) 3021 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime); 3022 else 3023 args->ctime = NO_CHANGE_64; 3024 3025 args->device = 0; 3026 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY); 3027 if (open_file) { 3028 u16 nfid = open_file->fid.netfid; 3029 u32 npid = open_file->pid; 3030 pTcon = tlink_tcon(open_file->tlink); 3031 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid); 3032 cifsFileInfo_put(open_file); 3033 } else { 3034 tlink = cifs_sb_tlink(cifs_sb); 3035 if (IS_ERR(tlink)) { 3036 rc = PTR_ERR(tlink); 3037 goto out; 3038 } 3039 pTcon = tlink_tcon(tlink); 3040 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args, 3041 cifs_sb->local_nls, 3042 cifs_remap(cifs_sb)); 3043 cifs_put_tlink(tlink); 3044 } 3045 3046 if (rc) 3047 goto out; 3048 3049 if ((attrs->ia_valid & ATTR_SIZE) && 3050 attrs->ia_size != i_size_read(inode)) { 3051 truncate_setsize(inode, attrs->ia_size); 3052 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size); 3053 } 3054 3055 setattr_copy(&nop_mnt_idmap, inode, attrs); 3056 mark_inode_dirty(inode); 3057 3058 /* force revalidate when any of these times are set since some 3059 of the fs types (eg ext3, fat) do not have fine enough 3060 time granularity to match protocol, and we do not have a 3061 a way (yet) to query the server fs's time granularity (and 3062 whether it rounds times down). 3063 */ 3064 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME)) 3065 cifsInode->time = 0; 3066 out: 3067 kfree(args); 3068 free_dentry_path(page); 3069 free_xid(xid); 3070 return rc; 3071 } 3072 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 3073 3074 static int 3075 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs) 3076 { 3077 unsigned int xid; 3078 kuid_t uid = INVALID_UID; 3079 kgid_t gid = INVALID_GID; 3080 struct inode *inode = d_inode(direntry); 3081 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 3082 struct cifsInodeInfo *cifsInode = CIFS_I(inode); 3083 struct cifsFileInfo *wfile; 3084 struct cifs_tcon *tcon; 3085 const char *full_path; 3086 void *page = alloc_dentry_path(); 3087 int rc = -EACCES; 3088 __u32 dosattr = 0; 3089 __u64 mode = NO_CHANGE_64; 3090 3091 xid = get_xid(); 3092 3093 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n", 3094 direntry, attrs->ia_valid); 3095 3096 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) 3097 attrs->ia_valid |= ATTR_FORCE; 3098 3099 rc = setattr_prepare(&nop_mnt_idmap, direntry, attrs); 3100 if (rc < 0) 3101 goto cifs_setattr_exit; 3102 3103 full_path = build_path_from_dentry(direntry, page); 3104 if (IS_ERR(full_path)) { 3105 rc = PTR_ERR(full_path); 3106 goto cifs_setattr_exit; 3107 } 3108 3109 /* 3110 * Attempt to flush data before changing attributes. We need to do 3111 * this for ATTR_SIZE and ATTR_MTIME. If the flush of the data 3112 * returns error, store it to report later and continue. 3113 * 3114 * BB: This should be smarter. Why bother flushing pages that 3115 * will be truncated anyway? Also, should we error out here if 3116 * the flush returns error? Do we need to check for ATTR_MTIME_SET flag? 3117 */ 3118 if (attrs->ia_valid & (ATTR_MTIME | ATTR_SIZE | ATTR_CTIME)) { 3119 rc = filemap_write_and_wait(inode->i_mapping); 3120 if (is_interrupt_error(rc)) { 3121 rc = -ERESTARTSYS; 3122 goto cifs_setattr_exit; 3123 } 3124 mapping_set_error(inode->i_mapping, rc); 3125 } 3126 3127 rc = 0; 3128 3129 if ((attrs->ia_valid & ATTR_MTIME) && 3130 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { 3131 rc = cifs_get_writable_file(cifsInode, FIND_WR_ANY, &wfile); 3132 if (!rc) { 3133 tcon = tlink_tcon(wfile->tlink); 3134 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid); 3135 cifsFileInfo_put(wfile); 3136 if (rc) 3137 goto cifs_setattr_exit; 3138 } else if (rc != -EBADF) 3139 goto cifs_setattr_exit; 3140 else 3141 rc = 0; 3142 } 3143 3144 if (attrs->ia_valid & ATTR_SIZE) { 3145 rc = cifs_set_file_size(inode, attrs, xid, full_path, direntry); 3146 if (rc != 0) 3147 goto cifs_setattr_exit; 3148 } 3149 3150 if (attrs->ia_valid & ATTR_UID) 3151 uid = attrs->ia_uid; 3152 3153 if (attrs->ia_valid & ATTR_GID) 3154 gid = attrs->ia_gid; 3155 3156 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) || 3157 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) { 3158 if (uid_valid(uid) || gid_valid(gid)) { 3159 mode = NO_CHANGE_64; 3160 rc = id_mode_to_cifs_acl(inode, full_path, &mode, 3161 uid, gid); 3162 if (rc) { 3163 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n", 3164 __func__, rc); 3165 goto cifs_setattr_exit; 3166 } 3167 } 3168 } else 3169 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) 3170 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID); 3171 3172 /* skip mode change if it's just for clearing setuid/setgid */ 3173 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) 3174 attrs->ia_valid &= ~ATTR_MODE; 3175 3176 if (attrs->ia_valid & ATTR_MODE) { 3177 mode = attrs->ia_mode; 3178 rc = 0; 3179 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) || 3180 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) { 3181 rc = id_mode_to_cifs_acl(inode, full_path, &mode, 3182 INVALID_UID, INVALID_GID); 3183 if (rc) { 3184 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n", 3185 __func__, rc); 3186 goto cifs_setattr_exit; 3187 } 3188 3189 /* 3190 * In case of CIFS_MOUNT_CIFS_ACL, we cannot support all modes. 3191 * Pick up the actual mode bits that were set. 3192 */ 3193 if (mode != attrs->ia_mode) 3194 attrs->ia_mode = mode; 3195 } else 3196 if (((mode & S_IWUGO) == 0) && 3197 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) { 3198 3199 dosattr = cifsInode->cifsAttrs | ATTR_READONLY; 3200 3201 /* fix up mode if we're not using dynperm */ 3202 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0) 3203 attrs->ia_mode = inode->i_mode & ~S_IWUGO; 3204 } else if ((mode & S_IWUGO) && 3205 (cifsInode->cifsAttrs & ATTR_READONLY)) { 3206 3207 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY; 3208 /* Attributes of 0 are ignored */ 3209 if (dosattr == 0) 3210 dosattr |= ATTR_NORMAL; 3211 3212 /* reset local inode permissions to normal */ 3213 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) { 3214 attrs->ia_mode &= ~(S_IALLUGO); 3215 if (S_ISDIR(inode->i_mode)) 3216 attrs->ia_mode |= 3217 cifs_sb->ctx->dir_mode; 3218 else 3219 attrs->ia_mode |= 3220 cifs_sb->ctx->file_mode; 3221 } 3222 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) { 3223 /* ignore mode change - ATTR_READONLY hasn't changed */ 3224 attrs->ia_valid &= ~ATTR_MODE; 3225 } 3226 } 3227 3228 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) || 3229 ((attrs->ia_valid & ATTR_MODE) && dosattr)) { 3230 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr); 3231 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */ 3232 3233 /* Even if error on time set, no sense failing the call if 3234 the server would set the time to a reasonable value anyway, 3235 and this check ensures that we are not being called from 3236 sys_utimes in which case we ought to fail the call back to 3237 the user when the server rejects the call */ 3238 if ((rc) && (attrs->ia_valid & 3239 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE))) 3240 rc = 0; 3241 } 3242 3243 /* do not need local check to inode_check_ok since the server does 3244 that */ 3245 if (rc) 3246 goto cifs_setattr_exit; 3247 3248 if ((attrs->ia_valid & ATTR_SIZE) && 3249 attrs->ia_size != i_size_read(inode)) { 3250 truncate_setsize(inode, attrs->ia_size); 3251 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size); 3252 } 3253 3254 setattr_copy(&nop_mnt_idmap, inode, attrs); 3255 mark_inode_dirty(inode); 3256 3257 cifs_setattr_exit: 3258 free_xid(xid); 3259 free_dentry_path(page); 3260 return rc; 3261 } 3262 3263 int 3264 cifs_setattr(struct mnt_idmap *idmap, struct dentry *direntry, 3265 struct iattr *attrs) 3266 { 3267 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); 3268 int rc, retries = 0; 3269 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 3270 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb); 3271 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 3272 3273 if (unlikely(cifs_forced_shutdown(cifs_sb))) 3274 return -EIO; 3275 3276 do { 3277 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 3278 if (pTcon->unix_ext) 3279 rc = cifs_setattr_unix(direntry, attrs); 3280 else 3281 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 3282 rc = cifs_setattr_nounix(direntry, attrs); 3283 retries++; 3284 } while (is_retryable_error(rc) && retries < 2); 3285 3286 /* BB: add cifs_setattr_legacy for really old servers */ 3287 return rc; 3288 } 3289