1/* 2 * fs/cifs/readdir.c 3 * 4 * Directory search handling 5 * 6 * Copyright (C) International Business Machines Corp., 2004, 2008 7 * Copyright (C) Red Hat, Inc., 2011 8 * Author(s): Steve French (sfrench@us.ibm.com) 9 * 10 * This library is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU Lesser General Public License as published 12 * by the Free Software Foundation; either version 2.1 of the License, or 13 * (at your option) any later version. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 18 * the GNU Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public License 21 * along with this library; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24#include <linux/fs.h> 25#include <linux/pagemap.h> 26#include <linux/slab.h> 27#include <linux/stat.h> 28#include "cifspdu.h" 29#include "cifsglob.h" 30#include "cifsproto.h" 31#include "cifs_unicode.h" 32#include "cifs_debug.h" 33#include "cifs_fs_sb.h" 34#include "cifsfs.h" 35#include "smb2proto.h" 36 37/* 38 * To be safe - for UCS to UTF-8 with strings loaded with the rare long 39 * characters alloc more to account for such multibyte target UTF-8 40 * characters. 41 */ 42#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2) 43 44#ifdef CONFIG_CIFS_DEBUG2 45static void dump_cifs_file_struct(struct file *file, char *label) 46{ 47 struct cifsFileInfo *cf; 48 49 if (file) { 50 cf = file->private_data; 51 if (cf == NULL) { 52 cifs_dbg(FYI, "empty cifs private file data\n"); 53 return; 54 } 55 if (cf->invalidHandle) 56 cifs_dbg(FYI, "Invalid handle\n"); 57 if (cf->srch_inf.endOfSearch) 58 cifs_dbg(FYI, "end of search\n"); 59 if (cf->srch_inf.emptyDir) 60 cifs_dbg(FYI, "empty dir\n"); 61 } 62} 63#else 64static inline void dump_cifs_file_struct(struct file *file, char *label) 65{ 66} 67#endif /* DEBUG2 */ 68 69/* 70 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT 71 * 72 * Find the dentry that matches "name". If there isn't one, create one. If it's 73 * a negative dentry or the uniqueid or filetype(mode) changed, 74 * then drop it and recreate it. 75 */ 76static void 77cifs_prime_dcache(struct dentry *parent, struct qstr *name, 78 struct cifs_fattr *fattr) 79{ 80 struct dentry *dentry, *alias; 81 struct inode *inode; 82 struct super_block *sb = parent->d_sb; 83 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 84 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 85 86 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name); 87 88 dentry = d_hash_and_lookup(parent, name); 89 if (!dentry) { 90 /* 91 * If we know that the inode will need to be revalidated 92 * immediately, then don't create a new dentry for it. 93 * We'll end up doing an on the wire call either way and 94 * this spares us an invalidation. 95 */ 96 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL) 97 return; 98retry: 99 dentry = d_alloc_parallel(parent, name, &wq); 100 } 101 if (IS_ERR(dentry)) 102 return; 103 if (!d_in_lookup(dentry)) { 104 inode = d_inode(dentry); 105 if (inode) { 106 if (d_mountpoint(dentry)) { 107 dput(dentry); 108 return; 109 } 110 /* 111 * If we're generating inode numbers, then we don't 112 * want to clobber the existing one with the one that 113 * the readdir code created. 114 */ 115 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) 116 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid; 117 118 /* update inode in place 119 * if both i_ino and i_mode didn't change */ 120 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid && 121 (inode->i_mode & S_IFMT) == 122 (fattr->cf_mode & S_IFMT)) { 123 cifs_fattr_to_inode(inode, fattr); 124 dput(dentry); 125 return; 126 } 127 } 128 d_invalidate(dentry); 129 dput(dentry); 130 goto retry; 131 } else { 132 inode = cifs_iget(sb, fattr); 133 if (!inode) 134 inode = ERR_PTR(-ENOMEM); 135 alias = d_splice_alias(inode, dentry); 136 d_lookup_done(dentry); 137 if (alias && !IS_ERR(alias)) 138 dput(alias); 139 } 140 dput(dentry); 141} 142 143static bool reparse_file_needs_reval(const struct cifs_fattr *fattr) 144{ 145 if (!(fattr->cf_cifsattrs & ATTR_REPARSE)) 146 return false; 147 /* 148 * The DFS tags should be only intepreted by server side as per 149 * MS-FSCC 2.1.2.1, but let's include them anyway. 150 * 151 * Besides, if cf_cifstag is unset (0), then we still need it to be 152 * revalidated to know exactly what reparse point it is. 153 */ 154 switch (fattr->cf_cifstag) { 155 case IO_REPARSE_TAG_DFS: 156 case IO_REPARSE_TAG_DFSR: 157 case IO_REPARSE_TAG_SYMLINK: 158 case IO_REPARSE_TAG_NFS: 159 case 0: 160 return true; 161 } 162 return false; 163} 164 165static void 166cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) 167{ 168 fattr->cf_uid = cifs_sb->mnt_uid; 169 fattr->cf_gid = cifs_sb->mnt_gid; 170 171 /* 172 * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they 173 * are preferred by the Linux client in some cases since, unlike 174 * the NFS reparse tag (or EAs), they don't require an extra query 175 * to determine which type of special file they represent. 176 * TODO: go through all documented reparse tags to see if we can 177 * reasonably map some of them to directories vs. files vs. symlinks 178 */ 179 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { 180 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; 181 fattr->cf_dtype = DT_DIR; 182 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_SYMLINK) { 183 fattr->cf_mode |= S_IFLNK | cifs_sb->mnt_file_mode; 184 fattr->cf_dtype = DT_LNK; 185 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_FIFO) { 186 fattr->cf_mode |= S_IFIFO | cifs_sb->mnt_file_mode; 187 fattr->cf_dtype = DT_FIFO; 188 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_AF_UNIX) { 189 fattr->cf_mode |= S_IFSOCK | cifs_sb->mnt_file_mode; 190 fattr->cf_dtype = DT_SOCK; 191 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_CHR) { 192 fattr->cf_mode |= S_IFCHR | cifs_sb->mnt_file_mode; 193 fattr->cf_dtype = DT_CHR; 194 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_BLK) { 195 fattr->cf_mode |= S_IFBLK | cifs_sb->mnt_file_mode; 196 fattr->cf_dtype = DT_BLK; 197 } else { /* TODO: should we mark some other reparse points (like DFSR) as directories? */ 198 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; 199 fattr->cf_dtype = DT_REG; 200 } 201 202 /* 203 * We need to revalidate it further to make a decision about whether it 204 * is a symbolic link, DFS referral or a reparse point with a direct 205 * access like junctions, deduplicated files, NFS symlinks. 206 */ 207 if (reparse_file_needs_reval(fattr)) 208 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; 209 210 /* non-unix readdir doesn't provide nlink */ 211 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK; 212 213 if (fattr->cf_cifsattrs & ATTR_READONLY) 214 fattr->cf_mode &= ~S_IWUGO; 215 216 /* 217 * We of course don't get ACL info in FIND_FIRST/NEXT results, so 218 * mark it for revalidation so that "ls -l" will look right. It might 219 * be super-slow, but if we don't do this then the ownership of files 220 * may look wrong since the inodes may not have timed out by the time 221 * "ls" does a stat() call on them. 222 */ 223 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) || 224 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) 225 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; 226 227 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && 228 fattr->cf_cifsattrs & ATTR_SYSTEM) { 229 if (fattr->cf_eof == 0) { 230 fattr->cf_mode &= ~S_IFMT; 231 fattr->cf_mode |= S_IFIFO; 232 fattr->cf_dtype = DT_FIFO; 233 } else { 234 /* 235 * trying to get the type and mode via SFU can be slow, 236 * so just call those regular files for now, and mark 237 * for reval 238 */ 239 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; 240 } 241 } 242} 243 244/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */ 245static void 246cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info, 247 struct cifs_sb_info *cifs_sb) 248{ 249 struct smb2_posix_info_parsed parsed; 250 251 posix_info_parse(info, NULL, &parsed); 252 253 memset(fattr, 0, sizeof(*fattr)); 254 fattr->cf_uniqueid = le64_to_cpu(info->Inode); 255 fattr->cf_bytes = le64_to_cpu(info->AllocationSize); 256 fattr->cf_eof = le64_to_cpu(info->EndOfFile); 257 258 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); 259 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); 260 fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime); 261 262 fattr->cf_nlink = le32_to_cpu(info->HardLinks); 263 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes); 264 265 /* 266 * Since we set the inode type below we need to mask off 267 * to avoid strange results if bits set above. 268 * XXX: why not make server&client use the type bits? 269 */ 270 fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT; 271 272 cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n", 273 le32_to_cpu(info->DeviceId), 274 le32_to_cpu(info->ReparseTag), 275 le32_to_cpu(info->Mode)); 276 277 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { 278 fattr->cf_mode |= S_IFDIR; 279 fattr->cf_dtype = DT_DIR; 280 } else { 281 /* 282 * mark anything that is not a dir as regular 283 * file. special files should have the REPARSE 284 * attribute and will be marked as needing revaluation 285 */ 286 fattr->cf_mode |= S_IFREG; 287 fattr->cf_dtype = DT_REG; 288 } 289 290 if (reparse_file_needs_reval(fattr)) 291 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; 292 293 sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER); 294 sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP); 295} 296 297static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info) 298{ 299 const FILE_DIRECTORY_INFO *fi = info; 300 301 memset(fattr, 0, sizeof(*fattr)); 302 fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes); 303 fattr->cf_eof = le64_to_cpu(fi->EndOfFile); 304 fattr->cf_bytes = le64_to_cpu(fi->AllocationSize); 305 fattr->cf_createtime = le64_to_cpu(fi->CreationTime); 306 fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime); 307 fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime); 308 fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime); 309} 310 311void 312cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, 313 struct cifs_sb_info *cifs_sb) 314{ 315 __dir_info_to_fattr(fattr, info); 316 cifs_fill_common_info(fattr, cifs_sb); 317} 318 319static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr, 320 SEARCH_ID_FULL_DIR_INFO *info, 321 struct cifs_sb_info *cifs_sb) 322{ 323 __dir_info_to_fattr(fattr, info); 324 325 /* See MS-FSCC 2.4.18 FileIdFullDirectoryInformation */ 326 if (fattr->cf_cifsattrs & ATTR_REPARSE) 327 fattr->cf_cifstag = le32_to_cpu(info->EaSize); 328 cifs_fill_common_info(fattr, cifs_sb); 329} 330 331static void 332cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, 333 struct cifs_sb_info *cifs_sb) 334{ 335 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; 336 337 memset(fattr, 0, sizeof(*fattr)); 338 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, 339 info->LastAccessTime, offset); 340 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, 341 info->LastWriteTime, offset); 342 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, 343 info->LastWriteTime, offset); 344 345 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); 346 fattr->cf_bytes = le32_to_cpu(info->AllocationSize); 347 fattr->cf_eof = le32_to_cpu(info->DataSize); 348 349 cifs_fill_common_info(fattr, cifs_sb); 350} 351 352/* BB eventually need to add the following helper function to 353 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when 354 we try to do FindFirst on (NTFS) directory symlinks */ 355/* 356int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, 357 unsigned int xid) 358{ 359 __u16 fid; 360 int len; 361 int oplock = 0; 362 int rc; 363 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); 364 char *tmpbuffer; 365 366 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, 367 OPEN_REPARSE_POINT, &fid, &oplock, NULL, 368 cifs_sb->local_nls, 369 cifs_remap(cifs_sb); 370 if (!rc) { 371 tmpbuffer = kmalloc(maxpath); 372 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, 373 tmpbuffer, 374 maxpath -1, 375 fid, 376 cifs_sb->local_nls); 377 if (CIFSSMBClose(xid, ptcon, fid)) { 378 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n"); 379 } 380 } 381} 382 */ 383 384static int 385initiate_cifs_search(const unsigned int xid, struct file *file, 386 char *full_path) 387{ 388 __u16 search_flags; 389 int rc = 0; 390 struct cifsFileInfo *cifsFile; 391 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); 392 struct tcon_link *tlink = NULL; 393 struct cifs_tcon *tcon; 394 struct TCP_Server_Info *server; 395 396 if (file->private_data == NULL) { 397 tlink = cifs_sb_tlink(cifs_sb); 398 if (IS_ERR(tlink)) 399 return PTR_ERR(tlink); 400 401 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); 402 if (cifsFile == NULL) { 403 rc = -ENOMEM; 404 goto error_exit; 405 } 406 spin_lock_init(&cifsFile->file_info_lock); 407 file->private_data = cifsFile; 408 cifsFile->tlink = cifs_get_tlink(tlink); 409 tcon = tlink_tcon(tlink); 410 } else { 411 cifsFile = file->private_data; 412 tcon = tlink_tcon(cifsFile->tlink); 413 } 414 415 server = tcon->ses->server; 416 417 if (!server->ops->query_dir_first) { 418 rc = -ENOSYS; 419 goto error_exit; 420 } 421 422 cifsFile->invalidHandle = true; 423 cifsFile->srch_inf.endOfSearch = false; 424 425 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos); 426 427ffirst_retry: 428 /* test for Unix extensions */ 429 /* but now check for them on the share/mount not on the SMB session */ 430 /* if (cap_unix(tcon->ses) { */ 431 if (tcon->unix_ext) 432 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 433 else if (tcon->posix_extensions) 434 cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO; 435 else if ((tcon->ses->capabilities & 436 tcon->ses->server->vals->cap_nt_find) == 0) { 437 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; 438 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { 439 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; 440 } else /* not srvinos - BB fixme add check for backlevel? */ { 441 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; 442 } 443 444 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; 445 if (backup_cred(cifs_sb)) 446 search_flags |= CIFS_SEARCH_BACKUP_SEARCH; 447 448 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb, 449 &cifsFile->fid, search_flags, 450 &cifsFile->srch_inf); 451 452 if (rc == 0) 453 cifsFile->invalidHandle = false; 454 /* BB add following call to handle readdir on new NTFS symlink errors 455 else if STATUS_STOPPED_ON_SYMLINK 456 call get_symlink_reparse_path and retry with new path */ 457 else if ((rc == -EOPNOTSUPP) && 458 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { 459 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; 460 goto ffirst_retry; 461 } 462error_exit: 463 cifs_put_tlink(tlink); 464 return rc; 465} 466 467/* return length of unicode string in bytes */ 468static int cifs_unicode_bytelen(const char *str) 469{ 470 int len; 471 const __le16 *ustr = (const __le16 *)str; 472 473 for (len = 0; len <= PATH_MAX; len++) { 474 if (ustr[len] == 0) 475 return len << 1; 476 } 477 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n"); 478 return len << 1; 479} 480 481static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) 482{ 483 char *new_entry; 484 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; 485 486 if (level == SMB_FIND_FILE_INFO_STANDARD) { 487 FIND_FILE_STANDARD_INFO *pfData; 488 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; 489 490 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + 491 pfData->FileNameLength; 492 } else { 493 u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset); 494 495 if (old_entry + next_offset < old_entry) { 496 cifs_dbg(VFS, "Invalid offset %u\n", next_offset); 497 return NULL; 498 } 499 new_entry = old_entry + next_offset; 500 } 501 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry); 502 /* validate that new_entry is not past end of SMB */ 503 if (new_entry >= end_of_smb) { 504 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n", 505 new_entry, end_of_smb, old_entry); 506 return NULL; 507 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && 508 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) 509 || ((level != SMB_FIND_FILE_INFO_STANDARD) && 510 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { 511 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n", 512 new_entry, end_of_smb); 513 return NULL; 514 } else 515 return new_entry; 516 517} 518 519struct cifs_dirent { 520 const char *name; 521 size_t namelen; 522 u32 resume_key; 523 u64 ino; 524}; 525 526static void cifs_fill_dirent_posix(struct cifs_dirent *de, 527 const struct smb2_posix_info *info) 528{ 529 struct smb2_posix_info_parsed parsed; 530 531 /* payload should have already been checked at this point */ 532 if (posix_info_parse(info, NULL, &parsed) < 0) { 533 cifs_dbg(VFS, "Invalid POSIX info payload\n"); 534 return; 535 } 536 537 de->name = parsed.name; 538 de->namelen = parsed.name_len; 539 de->resume_key = info->Ignored; 540 de->ino = le64_to_cpu(info->Inode); 541} 542 543static void cifs_fill_dirent_unix(struct cifs_dirent *de, 544 const FILE_UNIX_INFO *info, bool is_unicode) 545{ 546 de->name = &info->FileName[0]; 547 if (is_unicode) 548 de->namelen = cifs_unicode_bytelen(de->name); 549 else 550 de->namelen = strnlen(de->name, PATH_MAX); 551 de->resume_key = info->ResumeKey; 552 de->ino = le64_to_cpu(info->basic.UniqueId); 553} 554 555static void cifs_fill_dirent_dir(struct cifs_dirent *de, 556 const FILE_DIRECTORY_INFO *info) 557{ 558 de->name = &info->FileName[0]; 559 de->namelen = le32_to_cpu(info->FileNameLength); 560 de->resume_key = info->FileIndex; 561} 562 563static void cifs_fill_dirent_full(struct cifs_dirent *de, 564 const FILE_FULL_DIRECTORY_INFO *info) 565{ 566 de->name = &info->FileName[0]; 567 de->namelen = le32_to_cpu(info->FileNameLength); 568 de->resume_key = info->FileIndex; 569} 570 571static void cifs_fill_dirent_search(struct cifs_dirent *de, 572 const SEARCH_ID_FULL_DIR_INFO *info) 573{ 574 de->name = &info->FileName[0]; 575 de->namelen = le32_to_cpu(info->FileNameLength); 576 de->resume_key = info->FileIndex; 577 de->ino = le64_to_cpu(info->UniqueId); 578} 579 580static void cifs_fill_dirent_both(struct cifs_dirent *de, 581 const FILE_BOTH_DIRECTORY_INFO *info) 582{ 583 de->name = &info->FileName[0]; 584 de->namelen = le32_to_cpu(info->FileNameLength); 585 de->resume_key = info->FileIndex; 586} 587 588static void cifs_fill_dirent_std(struct cifs_dirent *de, 589 const FIND_FILE_STANDARD_INFO *info) 590{ 591 de->name = &info->FileName[0]; 592 /* one byte length, no endianess conversion */ 593 de->namelen = info->FileNameLength; 594 de->resume_key = info->ResumeKey; 595} 596 597static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, 598 u16 level, bool is_unicode) 599{ 600 memset(de, 0, sizeof(*de)); 601 602 switch (level) { 603 case SMB_FIND_FILE_POSIX_INFO: 604 cifs_fill_dirent_posix(de, info); 605 break; 606 case SMB_FIND_FILE_UNIX: 607 cifs_fill_dirent_unix(de, info, is_unicode); 608 break; 609 case SMB_FIND_FILE_DIRECTORY_INFO: 610 cifs_fill_dirent_dir(de, info); 611 break; 612 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 613 cifs_fill_dirent_full(de, info); 614 break; 615 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 616 cifs_fill_dirent_search(de, info); 617 break; 618 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: 619 cifs_fill_dirent_both(de, info); 620 break; 621 case SMB_FIND_FILE_INFO_STANDARD: 622 cifs_fill_dirent_std(de, info); 623 break; 624 default: 625 cifs_dbg(FYI, "Unknown findfirst level %d\n", level); 626 return -EINVAL; 627 } 628 629 return 0; 630} 631 632#define UNICODE_DOT cpu_to_le16(0x2e) 633 634/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ 635static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) 636{ 637 int rc = 0; 638 639 if (!de->name) 640 return 0; 641 642 if (is_unicode) { 643 __le16 *ufilename = (__le16 *)de->name; 644 if (de->namelen == 2) { 645 /* check for . */ 646 if (ufilename[0] == UNICODE_DOT) 647 rc = 1; 648 } else if (de->namelen == 4) { 649 /* check for .. */ 650 if (ufilename[0] == UNICODE_DOT && 651 ufilename[1] == UNICODE_DOT) 652 rc = 2; 653 } 654 } else /* ASCII */ { 655 if (de->namelen == 1) { 656 if (de->name[0] == '.') 657 rc = 1; 658 } else if (de->namelen == 2) { 659 if (de->name[0] == '.' && de->name[1] == '.') 660 rc = 2; 661 } 662 } 663 664 return rc; 665} 666 667/* Check if directory that we are searching has changed so we can decide 668 whether we can use the cached search results from the previous search */ 669static int is_dir_changed(struct file *file) 670{ 671 struct inode *inode = file_inode(file); 672 struct cifsInodeInfo *cifsInfo = CIFS_I(inode); 673 674 if (cifsInfo->time == 0) 675 return 1; /* directory was changed, perhaps due to unlink */ 676 else 677 return 0; 678 679} 680 681static int cifs_save_resume_key(const char *current_entry, 682 struct cifsFileInfo *file_info) 683{ 684 struct cifs_dirent de; 685 int rc; 686 687 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, 688 file_info->srch_inf.unicode); 689 if (!rc) { 690 file_info->srch_inf.presume_name = de.name; 691 file_info->srch_inf.resume_name_len = de.namelen; 692 file_info->srch_inf.resume_key = de.resume_key; 693 } 694 return rc; 695} 696 697/* 698 * Find the corresponding entry in the search. Note that the SMB server returns 699 * search entries for . and .. which complicates logic here if we choose to 700 * parse for them and we do not assume that they are located in the findfirst 701 * return buffer. We start counting in the buffer with entry 2 and increment for 702 * every entry (do not increment for . or .. entry). 703 */ 704static int 705find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos, 706 struct file *file, char *full_path, 707 char **current_entry, int *num_to_ret) 708{ 709 __u16 search_flags; 710 int rc = 0; 711 int pos_in_buf = 0; 712 loff_t first_entry_in_buffer; 713 loff_t index_to_find = pos; 714 struct cifsFileInfo *cfile = file->private_data; 715 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); 716 struct TCP_Server_Info *server = tcon->ses->server; 717 /* check if index in the buffer */ 718 719 if (!server->ops->query_dir_first || !server->ops->query_dir_next) 720 return -ENOSYS; 721 722 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL)) 723 return -ENOENT; 724 725 *current_entry = NULL; 726 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - 727 cfile->srch_inf.entries_in_buffer; 728 729 /* 730 * If first entry in buf is zero then is first buffer 731 * in search response data which means it is likely . and .. 732 * will be in this buffer, although some servers do not return 733 * . and .. for the root of a drive and for those we need 734 * to start two entries earlier. 735 */ 736 737 dump_cifs_file_struct(file, "In fce "); 738 if (((index_to_find < cfile->srch_inf.index_of_last_entry) && 739 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) { 740 /* close and restart search */ 741 cifs_dbg(FYI, "search backing up - close and restart search\n"); 742 spin_lock(&cfile->file_info_lock); 743 if (server->ops->dir_needs_close(cfile)) { 744 cfile->invalidHandle = true; 745 spin_unlock(&cfile->file_info_lock); 746 if (server->ops->close_dir) 747 server->ops->close_dir(xid, tcon, &cfile->fid); 748 } else 749 spin_unlock(&cfile->file_info_lock); 750 if (cfile->srch_inf.ntwrk_buf_start) { 751 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n"); 752 if (cfile->srch_inf.smallBuf) 753 cifs_small_buf_release(cfile->srch_inf. 754 ntwrk_buf_start); 755 else 756 cifs_buf_release(cfile->srch_inf. 757 ntwrk_buf_start); 758 cfile->srch_inf.ntwrk_buf_start = NULL; 759 } 760 rc = initiate_cifs_search(xid, file, full_path); 761 if (rc) { 762 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n", 763 rc); 764 return rc; 765 } 766 /* FindFirst/Next set last_entry to NULL on malformed reply */ 767 if (cfile->srch_inf.last_entry) 768 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); 769 } 770 771 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; 772 if (backup_cred(cifs_sb)) 773 search_flags |= CIFS_SEARCH_BACKUP_SEARCH; 774 775 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) && 776 (rc == 0) && !cfile->srch_inf.endOfSearch) { 777 cifs_dbg(FYI, "calling findnext2\n"); 778 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid, 779 search_flags, 780 &cfile->srch_inf); 781 /* FindFirst/Next set last_entry to NULL on malformed reply */ 782 if (cfile->srch_inf.last_entry) 783 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); 784 if (rc) 785 return -ENOENT; 786 } 787 if (index_to_find < cfile->srch_inf.index_of_last_entry) { 788 /* we found the buffer that contains the entry */ 789 /* scan and find it */ 790 int i; 791 char *cur_ent; 792 char *end_of_smb; 793 794 if (cfile->srch_inf.ntwrk_buf_start == NULL) { 795 cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n"); 796 return -EIO; 797 } 798 799 end_of_smb = cfile->srch_inf.ntwrk_buf_start + 800 server->ops->calc_smb_size( 801 cfile->srch_inf.ntwrk_buf_start, 802 server); 803 804 cur_ent = cfile->srch_inf.srch_entries_start; 805 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry 806 - cfile->srch_inf.entries_in_buffer; 807 pos_in_buf = index_to_find - first_entry_in_buffer; 808 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf); 809 810 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) { 811 /* go entry by entry figuring out which is first */ 812 cur_ent = nxt_dir_entry(cur_ent, end_of_smb, 813 cfile->srch_inf.info_level); 814 } 815 if ((cur_ent == NULL) && (i < pos_in_buf)) { 816 /* BB fixme - check if we should flag this error */ 817 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n", 818 pos_in_buf, index_to_find, rc); 819 } 820 rc = 0; 821 *current_entry = cur_ent; 822 } else { 823 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n"); 824 return 0; 825 } 826 827 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) { 828 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n"); 829 *num_to_ret = 0; 830 } else 831 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf; 832 833 return rc; 834} 835 836static int cifs_filldir(char *find_entry, struct file *file, 837 struct dir_context *ctx, 838 char *scratch_buf, unsigned int max_len) 839{ 840 struct cifsFileInfo *file_info = file->private_data; 841 struct super_block *sb = file_inode(file)->i_sb; 842 struct cifs_sb_info *cifs_sb = CIFS_SB(sb); 843 struct cifs_dirent de = { NULL, }; 844 struct cifs_fattr fattr; 845 struct qstr name; 846 int rc = 0; 847 ino_t ino; 848 849 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, 850 file_info->srch_inf.unicode); 851 if (rc) 852 return rc; 853 854 if (de.namelen > max_len) { 855 cifs_dbg(VFS, "bad search response length %zd past smb end\n", 856 de.namelen); 857 return -EINVAL; 858 } 859 860 /* skip . and .. since we added them first */ 861 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) 862 return 0; 863 864 if (file_info->srch_inf.unicode) { 865 struct nls_table *nlt = cifs_sb->local_nls; 866 int map_type; 867 868 map_type = cifs_remap(cifs_sb); 869 name.name = scratch_buf; 870 name.len = 871 cifs_from_utf16((char *)name.name, (__le16 *)de.name, 872 UNICODE_NAME_MAX, 873 min_t(size_t, de.namelen, 874 (size_t)max_len), nlt, map_type); 875 name.len -= nls_nullsize(nlt); 876 } else { 877 name.name = de.name; 878 name.len = de.namelen; 879 } 880 881 switch (file_info->srch_inf.info_level) { 882 case SMB_FIND_FILE_POSIX_INFO: 883 cifs_posix_to_fattr(&fattr, 884 (struct smb2_posix_info *)find_entry, 885 cifs_sb); 886 break; 887 case SMB_FIND_FILE_UNIX: 888 cifs_unix_basic_to_fattr(&fattr, 889 &((FILE_UNIX_INFO *)find_entry)->basic, 890 cifs_sb); 891 break; 892 case SMB_FIND_FILE_INFO_STANDARD: 893 cifs_std_info_to_fattr(&fattr, 894 (FIND_FILE_STANDARD_INFO *)find_entry, 895 cifs_sb); 896 break; 897 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 898 cifs_fulldir_info_to_fattr(&fattr, 899 (SEARCH_ID_FULL_DIR_INFO *)find_entry, 900 cifs_sb); 901 break; 902 default: 903 cifs_dir_info_to_fattr(&fattr, 904 (FILE_DIRECTORY_INFO *)find_entry, 905 cifs_sb); 906 break; 907 } 908 909 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { 910 fattr.cf_uniqueid = de.ino; 911 } else { 912 fattr.cf_uniqueid = iunique(sb, ROOT_I); 913 cifs_autodisable_serverino(cifs_sb); 914 } 915 916 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && 917 couldbe_mf_symlink(&fattr)) 918 /* 919 * trying to get the type and mode can be slow, 920 * so just call those regular files for now, and mark 921 * for reval 922 */ 923 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; 924 925 cifs_prime_dcache(file_dentry(file), &name, &fattr); 926 927 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); 928 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype); 929} 930 931 932int cifs_readdir(struct file *file, struct dir_context *ctx) 933{ 934 int rc = 0; 935 unsigned int xid; 936 int i; 937 struct cifs_tcon *tcon; 938 struct cifsFileInfo *cifsFile = NULL; 939 char *current_entry; 940 int num_to_fill = 0; 941 char *tmp_buf = NULL; 942 char *end_of_smb; 943 unsigned int max_len; 944 char *full_path = NULL; 945 946 xid = get_xid(); 947 948 full_path = build_path_from_dentry(file_dentry(file)); 949 if (full_path == NULL) { 950 rc = -ENOMEM; 951 goto rddir2_exit; 952 } 953 954 /* 955 * Ensure FindFirst doesn't fail before doing filldir() for '.' and 956 * '..'. Otherwise we won't be able to notify VFS in case of failure. 957 */ 958 if (file->private_data == NULL) { 959 rc = initiate_cifs_search(xid, file, full_path); 960 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc); 961 if (rc) 962 goto rddir2_exit; 963 } 964 965 if (!dir_emit_dots(file, ctx)) 966 goto rddir2_exit; 967 968 /* 1) If search is active, 969 is in current search buffer? 970 if it before then restart search 971 if after then keep searching till find it */ 972 973 cifsFile = file->private_data; 974 if (cifsFile->srch_inf.endOfSearch) { 975 if (cifsFile->srch_inf.emptyDir) { 976 cifs_dbg(FYI, "End of search, empty dir\n"); 977 rc = 0; 978 goto rddir2_exit; 979 } 980 } /* else { 981 cifsFile->invalidHandle = true; 982 tcon->ses->server->close(xid, tcon, &cifsFile->fid); 983 } */ 984 985 tcon = tlink_tcon(cifsFile->tlink); 986 rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path, 987 ¤t_entry, &num_to_fill); 988 if (rc) { 989 cifs_dbg(FYI, "fce error %d\n", rc); 990 goto rddir2_exit; 991 } else if (current_entry != NULL) { 992 cifs_dbg(FYI, "entry %lld found\n", ctx->pos); 993 } else { 994 cifs_dbg(FYI, "Could not find entry\n"); 995 goto rddir2_exit; 996 } 997 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n", 998 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); 999 max_len = tcon->ses->server->ops->calc_smb_size( 1000 cifsFile->srch_inf.ntwrk_buf_start, 1001 tcon->ses->server); 1002 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; 1003 1004 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); 1005 if (tmp_buf == NULL) { 1006 rc = -ENOMEM; 1007 goto rddir2_exit; 1008 } 1009 1010 for (i = 0; i < num_to_fill; i++) { 1011 if (current_entry == NULL) { 1012 /* evaluate whether this case is an error */ 1013 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n", 1014 num_to_fill, i); 1015 break; 1016 } 1017 /* 1018 * if buggy server returns . and .. late do we want to 1019 * check for that here? 1020 */ 1021 *tmp_buf = 0; 1022 rc = cifs_filldir(current_entry, file, ctx, 1023 tmp_buf, max_len); 1024 if (rc) { 1025 if (rc > 0) 1026 rc = 0; 1027 break; 1028 } 1029 1030 ctx->pos++; 1031 if (ctx->pos == 1032 cifsFile->srch_inf.index_of_last_entry) { 1033 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n", 1034 ctx->pos, tmp_buf); 1035 cifs_save_resume_key(current_entry, cifsFile); 1036 break; 1037 } else 1038 current_entry = 1039 nxt_dir_entry(current_entry, end_of_smb, 1040 cifsFile->srch_inf.info_level); 1041 } 1042 kfree(tmp_buf); 1043 1044rddir2_exit: 1045 kfree(full_path); 1046 free_xid(xid); 1047 return rc; 1048} 1049