readdir.c

   1// SPDX-License-Identifier: LGPL-2.1
   2/*
   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 */
  11#include <linux/fs.h>
  12#include <linux/namei.h>
  13#include <linux/pagemap.h>
  14#include <linux/slab.h>
  15#include <linux/stat.h>
  16#include "cifspdu.h"
  17#include "cifsglob.h"
  18#include "cifsproto.h"
  19#include "cifs_unicode.h"
  20#include "cifs_debug.h"
  21#include "cifs_fs_sb.h"
  22#include "cifsfs.h"
  23#include "smb2proto.h"
  24#include "fs_context.h"
  25#include "cached_dir.h"
  26#include "reparse.h"
  27
  28/*
  29 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
  30 * characters alloc more to account for such multibyte target UTF-8
  31 * characters.
  32 */
  33#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
  34
  35#ifdef CONFIG_CIFS_DEBUG2
  36static void dump_cifs_file_struct(struct file *file, char *label)
  37{
  38	struct cifsFileInfo *cf;
  39
  40	if (file) {
  41		cf = file->private_data;
  42		if (cf == NULL) {
  43			cifs_dbg(FYI, "empty cifs private file data\n");
  44			return;
  45		}
  46		if (cf->invalidHandle)
  47			cifs_dbg(FYI, "Invalid handle\n");
  48		if (cf->srch_inf.endOfSearch)
  49			cifs_dbg(FYI, "end of search\n");
  50		if (cf->srch_inf.emptyDir)
  51			cifs_dbg(FYI, "empty dir\n");
  52	}
  53}
  54#else
  55static inline void dump_cifs_file_struct(struct file *file, char *label)
  56{
  57}
  58#endif /* DEBUG2 */
  59
  60/*
  61 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
  62 *
  63 * Find the dentry that matches "name". If there isn't one, create one. If it's
  64 * a negative dentry or the uniqueid or filetype(mode) changed,
  65 * then drop it and recreate it.
  66 */
  67static void
  68cifs_prime_dcache(struct dentry *parent, struct qstr *name,
  69		    struct cifs_fattr *fattr)
  70{
  71	struct dentry *dentry, *alias;
  72	struct inode *inode;
  73	struct super_block *sb = parent->d_sb;
  74	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
  75	bool posix = cifs_sb_master_tcon(cifs_sb)->posix_extensions;
  76	bool reparse_need_reval = false;
  77	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
  78	int rc;
  79
  80	cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
  81
  82	dentry = try_lookup_noperm(name, parent);
  83	if (!dentry) {
  84		/*
  85		 * If we know that the inode will need to be revalidated
  86		 * immediately, then don't create a new dentry for it.
  87		 * We'll end up doing an on the wire call either way and
  88		 * this spares us an invalidation.
  89		 */
  90retry:
  91		if (posix) {
  92			switch (fattr->cf_mode & S_IFMT) {
  93			case S_IFLNK:
  94			case S_IFBLK:
  95			case S_IFCHR:
  96				reparse_need_reval = true;
  97				break;
  98			default:
  99				break;
 100			}
 101		} else if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT) {
 102			reparse_need_reval = true;
 103		}
 104
 105		if (reparse_need_reval ||
 106		    (fattr->cf_flags & CIFS_FATTR_NEED_REVAL))
 107			return;
 108
 109		dentry = d_alloc_parallel(parent, name, &wq);
 110	}
 111	if (IS_ERR(dentry))
 112		return;
 113	if (!d_in_lookup(dentry)) {
 114		inode = d_inode(dentry);
 115		if (inode) {
 116			if (d_mountpoint(dentry)) {
 117				dput(dentry);
 118				return;
 119			}
 120			/*
 121			 * If we're generating inode numbers, then we don't
 122			 * want to clobber the existing one with the one that
 123			 * the readdir code created.
 124			 */
 125			if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
 126				fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
 127
 128			/*
 129			 * Update inode in place if both i_ino and i_mode didn't
 130			 * change.
 131			 */
 132			if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
 133				/*
 134				 * Query dir responses don't provide enough
 135				 * information about reparse points other than
 136				 * their reparse tags.  Save an invalidation by
 137				 * not clobbering some existing attributes when
 138				 * reparse tag and ctime haven't changed.
 139				 */
 140				rc = 0;
 141				if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT) {
 142					if (likely(reparse_inode_match(inode, fattr))) {
 143						fattr->cf_mode = inode->i_mode;
 144						fattr->cf_rdev = inode->i_rdev;
 145						fattr->cf_uid = inode->i_uid;
 146						fattr->cf_gid = inode->i_gid;
 147						fattr->cf_eof = CIFS_I(inode)->netfs.remote_i_size;
 148						fattr->cf_symlink_target = NULL;
 149					} else {
 150						CIFS_I(inode)->time = 0;
 151						rc = -ESTALE;
 152					}
 153				}
 154				if (!rc && !cifs_fattr_to_inode(inode, fattr, true)) {
 155					dput(dentry);
 156					return;
 157				}
 158			}
 159		}
 160		d_invalidate(dentry);
 161		dput(dentry);
 162		goto retry;
 163	} else {
 164		inode = cifs_iget(sb, fattr);
 165		if (!inode)
 166			inode = ERR_PTR(-ENOMEM);
 167		alias = d_splice_alias(inode, dentry);
 168		d_lookup_done(dentry);
 169		if (alias && !IS_ERR(alias))
 170			dput(alias);
 171	}
 172	dput(dentry);
 173}
 174
 175static void
 176cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
 177{
 178	struct cifs_open_info_data data = {
 179		.reparse = { .tag = fattr->cf_cifstag, },
 180	};
 181
 182	fattr->cf_uid = cifs_sb->ctx->linux_uid;
 183	fattr->cf_gid = cifs_sb->ctx->linux_gid;
 184
 185	/*
 186	 * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
 187	 * are preferred by the Linux client in some cases since, unlike
 188	 * the NFS reparse tag (or EAs), they don't require an extra query
 189	 * to determine which type of special file they represent.
 190	 * TODO: go through all documented  reparse tags to see if we can
 191	 * reasonably map some of them to directories vs. files vs. symlinks
 192	 */
 193	if ((fattr->cf_cifsattrs & ATTR_REPARSE_POINT) &&
 194	    cifs_reparse_point_to_fattr(cifs_sb, fattr, &data))
 195		goto out_reparse;
 196
 197	if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
 198		fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
 199		fattr->cf_dtype = DT_DIR;
 200	} else {
 201		fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
 202		fattr->cf_dtype = DT_REG;
 203	}
 204
 205out_reparse:
 206	/* non-unix readdir doesn't provide nlink */
 207	fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
 208
 209	if (fattr->cf_cifsattrs & ATTR_READONLY)
 210		fattr->cf_mode &= ~S_IWUGO;
 211
 212	/*
 213	 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
 214	 * mark it for revalidation so that "ls -l" will look right. It might
 215	 * be super-slow, but if we don't do this then the ownership of files
 216	 * may look wrong since the inodes may not have timed out by the time
 217	 * "ls" does a stat() call on them.
 218	 */
 219	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
 220	    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
 221		fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
 222
 223	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
 224	    fattr->cf_cifsattrs & ATTR_SYSTEM) {
 225		if (fattr->cf_eof == 0)  {
 226			fattr->cf_mode &= ~S_IFMT;
 227			fattr->cf_mode |= S_IFIFO;
 228			fattr->cf_dtype = DT_FIFO;
 229		} else {
 230			/*
 231			 * trying to get the type and mode via SFU can be slow,
 232			 * so just call those regular files for now, and mark
 233			 * for reval
 234			 */
 235			fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
 236		}
 237	}
 238}
 239
 240/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
 241static void
 242cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
 243		    struct cifs_sb_info *cifs_sb)
 244{
 245	struct smb2_posix_info_parsed parsed;
 246
 247	posix_info_parse(info, NULL, &parsed);
 248
 249	memset(fattr, 0, sizeof(*fattr));
 250	fattr->cf_uniqueid = le64_to_cpu(info->Inode);
 251	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
 252	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
 253
 254	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
 255	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
 256	fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
 257
 258	fattr->cf_nlink = le32_to_cpu(info->HardLinks);
 259	fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
 260
 261	if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT)
 262		fattr->cf_cifstag = le32_to_cpu(info->ReparseTag);
 263
 264	/* The Mode field in the response can now include the file type as well */
 265	fattr->cf_mode = wire_mode_to_posix(le32_to_cpu(info->Mode),
 266					    fattr->cf_cifsattrs & ATTR_DIRECTORY);
 267	fattr->cf_dtype = S_DT(fattr->cf_mode);
 268
 269	switch (fattr->cf_mode & S_IFMT) {
 270	case S_IFLNK:
 271	case S_IFBLK:
 272	case S_IFCHR:
 273		fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
 274		break;
 275	default:
 276		break;
 277	}
 278
 279	cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
 280		 le32_to_cpu(info->DeviceId),
 281		 le32_to_cpu(info->ReparseTag),
 282		 le32_to_cpu(info->Mode));
 283
 284	sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
 285	sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
 286}
 287
 288static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
 289{
 290	const FILE_DIRECTORY_INFO *fi = info;
 291
 292	memset(fattr, 0, sizeof(*fattr));
 293	fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
 294	fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
 295	fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
 296	fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
 297	fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
 298	fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
 299	fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
 300}
 301
 302void
 303cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
 304		       struct cifs_sb_info *cifs_sb)
 305{
 306	__dir_info_to_fattr(fattr, info);
 307	cifs_fill_common_info(fattr, cifs_sb);
 308}
 309
 310static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
 311				       const void *info,
 312				       struct cifs_sb_info *cifs_sb)
 313{
 314	const FILE_FULL_DIRECTORY_INFO *di = info;
 315
 316	__dir_info_to_fattr(fattr, info);
 317
 318	/* See MS-FSCC 2.4.14, 2.4.19 */
 319	if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT)
 320		fattr->cf_cifstag = le32_to_cpu(di->EaSize);
 321	cifs_fill_common_info(fattr, cifs_sb);
 322}
 323
 324static void
 325cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
 326		       struct cifs_sb_info *cifs_sb)
 327{
 328	int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
 329
 330	memset(fattr, 0, sizeof(*fattr));
 331	fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
 332					    info->LastAccessTime, offset);
 333	fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
 334					    info->LastWriteTime, offset);
 335	fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
 336					    info->LastWriteTime, offset);
 337
 338	fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
 339	fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
 340	fattr->cf_eof = le32_to_cpu(info->DataSize);
 341
 342	cifs_fill_common_info(fattr, cifs_sb);
 343}
 344
 345static int
 346_initiate_cifs_search(const unsigned int xid, struct file *file,
 347		     const char *full_path)
 348{
 349	__u16 search_flags;
 350	int rc = 0;
 351	struct cifsFileInfo *cifsFile;
 352	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 353	struct tcon_link *tlink = NULL;
 354	struct cifs_tcon *tcon;
 355	struct TCP_Server_Info *server;
 356
 357	if (file->private_data == NULL) {
 358		tlink = cifs_sb_tlink(cifs_sb);
 359		if (IS_ERR(tlink))
 360			return PTR_ERR(tlink);
 361
 362		cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
 363		if (cifsFile == NULL) {
 364			rc = -ENOMEM;
 365			goto error_exit;
 366		}
 367		spin_lock_init(&cifsFile->file_info_lock);
 368		file->private_data = cifsFile;
 369		cifsFile->tlink = cifs_get_tlink(tlink);
 370		tcon = tlink_tcon(tlink);
 371	} else {
 372		cifsFile = file->private_data;
 373		tcon = tlink_tcon(cifsFile->tlink);
 374	}
 375
 376	server = tcon->ses->server;
 377
 378	if (!server->ops->query_dir_first) {
 379		rc = -ENOSYS;
 380		goto error_exit;
 381	}
 382
 383	cifsFile->invalidHandle = true;
 384	cifsFile->srch_inf.endOfSearch = false;
 385
 386	cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
 387
 388ffirst_retry:
 389	/* test for Unix extensions */
 390	/* but now check for them on the share/mount not on the SMB session */
 391	/* if (cap_unix(tcon->ses) { */
 392	if (tcon->unix_ext)
 393		cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 394	else if (tcon->posix_extensions)
 395		cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
 396	else if ((tcon->ses->capabilities &
 397		  tcon->ses->server->vals->cap_nt_find) == 0) {
 398		cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
 399	} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 400		cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 401	} else /* not srvinos - BB fixme add check for backlevel? */ {
 402		cifsFile->srch_inf.info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
 403	}
 404
 405	search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
 406	if (backup_cred(cifs_sb))
 407		search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
 408
 409	rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
 410					  &cifsFile->fid, search_flags,
 411					  &cifsFile->srch_inf);
 412
 413	if (rc == 0) {
 414		cifsFile->invalidHandle = false;
 415	} else if ((rc == -EOPNOTSUPP) &&
 416		   (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 417		cifs_autodisable_serverino(cifs_sb);
 418		goto ffirst_retry;
 419	}
 420error_exit:
 421	cifs_put_tlink(tlink);
 422	return rc;
 423}
 424
 425static int
 426initiate_cifs_search(const unsigned int xid, struct file *file,
 427		     const char *full_path)
 428{
 429	int rc, retry_count = 0;
 430
 431	do {
 432		rc = _initiate_cifs_search(xid, file, full_path);
 433		/*
 434		 * If we don't have enough credits to start reading the
 435		 * directory just try again after short wait.
 436		 */
 437		if (rc != -EDEADLK)
 438			break;
 439
 440		usleep_range(512, 2048);
 441	} while (retry_count++ < 5);
 442
 443	return rc;
 444}
 445
 446/* return length of unicode string in bytes */
 447static int cifs_unicode_bytelen(const char *str)
 448{
 449	int len;
 450	const __le16 *ustr = (const __le16 *)str;
 451
 452	for (len = 0; len <= PATH_MAX; len++) {
 453		if (ustr[len] == 0)
 454			return len << 1;
 455	}
 456	cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
 457	return len << 1;
 458}
 459
 460static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
 461{
 462	char *new_entry;
 463	FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 464
 465	if (level == SMB_FIND_FILE_INFO_STANDARD) {
 466		FIND_FILE_STANDARD_INFO *pfData;
 467		pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 468
 469		new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 +
 470				pfData->FileNameLength;
 471	} else {
 472		u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
 473
 474		if (old_entry + next_offset < old_entry) {
 475			cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
 476			return NULL;
 477		}
 478		new_entry = old_entry + next_offset;
 479	}
 480	cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
 481	/* validate that new_entry is not past end of SMB */
 482	if (new_entry >= end_of_smb) {
 483		cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
 484			 new_entry, end_of_smb, old_entry);
 485		return NULL;
 486	} else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
 487		    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 > end_of_smb))
 488		  || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
 489		   (new_entry + sizeof(FILE_DIRECTORY_INFO) + 1 > end_of_smb)))  {
 490		cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
 491			 new_entry, end_of_smb);
 492		return NULL;
 493	} else
 494		return new_entry;
 495
 496}
 497
 498struct cifs_dirent {
 499	const char	*name;
 500	size_t		namelen;
 501	u32		resume_key;
 502	u64		ino;
 503};
 504
 505static void cifs_fill_dirent_posix(struct cifs_dirent *de,
 506				   const struct smb2_posix_info *info)
 507{
 508	struct smb2_posix_info_parsed parsed;
 509
 510	/* payload should have already been checked at this point */
 511	if (posix_info_parse(info, NULL, &parsed) < 0) {
 512		cifs_dbg(VFS, "Invalid POSIX info payload\n");
 513		return;
 514	}
 515
 516	de->name = parsed.name;
 517	de->namelen = parsed.name_len;
 518	de->resume_key = info->Ignored;
 519	de->ino = le64_to_cpu(info->Inode);
 520}
 521
 522static void cifs_fill_dirent_unix(struct cifs_dirent *de,
 523		const FILE_UNIX_INFO *info, bool is_unicode)
 524{
 525	de->name = &info->FileName[0];
 526	if (is_unicode)
 527		de->namelen = cifs_unicode_bytelen(de->name);
 528	else
 529		de->namelen = strnlen(de->name, PATH_MAX);
 530	de->resume_key = info->ResumeKey;
 531	de->ino = le64_to_cpu(info->basic.UniqueId);
 532}
 533
 534static void cifs_fill_dirent_dir(struct cifs_dirent *de,
 535		const FILE_DIRECTORY_INFO *info)
 536{
 537	de->name = &info->FileName[0];
 538	de->namelen = le32_to_cpu(info->FileNameLength);
 539	de->resume_key = info->FileIndex;
 540}
 541
 542static void cifs_fill_dirent_full(struct cifs_dirent *de,
 543		const FILE_FULL_DIRECTORY_INFO *info)
 544{
 545	de->name = &info->FileName[0];
 546	de->namelen = le32_to_cpu(info->FileNameLength);
 547	de->resume_key = info->FileIndex;
 548}
 549
 550static void cifs_fill_dirent_search(struct cifs_dirent *de,
 551		const FILE_ID_FULL_DIR_INFO *info)
 552{
 553	de->name = &info->FileName[0];
 554	de->namelen = le32_to_cpu(info->FileNameLength);
 555	de->resume_key = info->FileIndex;
 556	de->ino = le64_to_cpu(info->UniqueId);
 557}
 558
 559static void cifs_fill_dirent_both(struct cifs_dirent *de,
 560		const FILE_BOTH_DIRECTORY_INFO *info)
 561{
 562	de->name = &info->FileName[0];
 563	de->namelen = le32_to_cpu(info->FileNameLength);
 564	de->resume_key = info->FileIndex;
 565}
 566
 567static void cifs_fill_dirent_std(struct cifs_dirent *de,
 568		const FIND_FILE_STANDARD_INFO *info)
 569{
 570	de->name = &info->FileName[0];
 571	/* one byte length, no endianness conversion */
 572	de->namelen = info->FileNameLength;
 573	de->resume_key = info->ResumeKey;
 574}
 575
 576static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
 577		u16 level, bool is_unicode)
 578{
 579	memset(de, 0, sizeof(*de));
 580
 581	switch (level) {
 582	case SMB_FIND_FILE_POSIX_INFO:
 583		cifs_fill_dirent_posix(de, info);
 584		break;
 585	case SMB_FIND_FILE_UNIX:
 586		cifs_fill_dirent_unix(de, info, is_unicode);
 587		break;
 588	case SMB_FIND_FILE_DIRECTORY_INFO:
 589		cifs_fill_dirent_dir(de, info);
 590		break;
 591	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
 592		cifs_fill_dirent_full(de, info);
 593		break;
 594	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
 595		cifs_fill_dirent_search(de, info);
 596		break;
 597	case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
 598		cifs_fill_dirent_both(de, info);
 599		break;
 600	case SMB_FIND_FILE_INFO_STANDARD:
 601		cifs_fill_dirent_std(de, info);
 602		break;
 603	default:
 604		cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
 605		return -EINVAL;
 606	}
 607
 608	return 0;
 609}
 610
 611#define UNICODE_DOT cpu_to_le16(0x2e)
 612
 613/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 614static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
 615{
 616	int rc = 0;
 617
 618	if (!de->name)
 619		return 0;
 620
 621	if (is_unicode) {
 622		__le16 *ufilename = (__le16 *)de->name;
 623		if (de->namelen == 2) {
 624			/* check for . */
 625			if (ufilename[0] == UNICODE_DOT)
 626				rc = 1;
 627		} else if (de->namelen == 4) {
 628			/* check for .. */
 629			if (ufilename[0] == UNICODE_DOT &&
 630			    ufilename[1] == UNICODE_DOT)
 631				rc = 2;
 632		}
 633	} else /* ASCII */ {
 634		if (de->namelen == 1) {
 635			if (de->name[0] == '.')
 636				rc = 1;
 637		} else if (de->namelen == 2) {
 638			if (de->name[0] == '.' && de->name[1] == '.')
 639				rc = 2;
 640		}
 641	}
 642
 643	return rc;
 644}
 645
 646/* Check if directory that we are searching has changed so we can decide
 647   whether we can use the cached search results from the previous search */
 648static int is_dir_changed(struct file *file)
 649{
 650	struct inode *inode = file_inode(file);
 651	struct cifsInodeInfo *cifs_inode_info = CIFS_I(inode);
 652
 653	if (cifs_inode_info->time == 0)
 654		return 1; /* directory was changed, e.g. unlink or new file */
 655	else
 656		return 0;
 657
 658}
 659
 660static int cifs_save_resume_key(const char *current_entry,
 661	struct cifsFileInfo *file_info)
 662{
 663	struct cifs_dirent de;
 664	int rc;
 665
 666	rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
 667			      file_info->srch_inf.unicode);
 668	if (!rc) {
 669		file_info->srch_inf.presume_name = de.name;
 670		file_info->srch_inf.resume_name_len = de.namelen;
 671		file_info->srch_inf.resume_key = de.resume_key;
 672	}
 673	return rc;
 674}
 675
 676/*
 677 * Find the corresponding entry in the search. Note that the SMB server returns
 678 * search entries for . and .. which complicates logic here if we choose to
 679 * parse for them and we do not assume that they are located in the findfirst
 680 * return buffer. We start counting in the buffer with entry 2 and increment for
 681 * every entry (do not increment for . or .. entry).
 682 */
 683static int
 684find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
 685		struct file *file, const char *full_path,
 686		char **current_entry, int *num_to_ret)
 687{
 688	__u16 search_flags;
 689	int rc = 0;
 690	int pos_in_buf = 0;
 691	loff_t first_entry_in_buffer;
 692	loff_t index_to_find = pos;
 693	struct cifsFileInfo *cfile = file->private_data;
 694	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 695	struct TCP_Server_Info *server = tcon->ses->server;
 696	/* check if index in the buffer */
 697
 698	if (!server->ops->query_dir_first || !server->ops->query_dir_next)
 699		return -ENOSYS;
 700
 701	if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
 702		return -ENOENT;
 703
 704	*current_entry = NULL;
 705	first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
 706					cfile->srch_inf.entries_in_buffer;
 707
 708	/*
 709	 * If first entry in buf is zero then is first buffer
 710	 * in search response data which means it is likely . and ..
 711	 * will be in this buffer, although some servers do not return
 712	 * . and .. for the root of a drive and for those we need
 713	 * to start two entries earlier.
 714	 */
 715
 716	dump_cifs_file_struct(file, "In fce ");
 717	if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
 718	     is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
 719		/* close and restart search */
 720		cifs_dbg(FYI, "search backing up - close and restart search\n");
 721		spin_lock(&cfile->file_info_lock);
 722		if (server->ops->dir_needs_close(cfile)) {
 723			cfile->invalidHandle = true;
 724			spin_unlock(&cfile->file_info_lock);
 725			if (server->ops->close_dir)
 726				server->ops->close_dir(xid, tcon, &cfile->fid);
 727		} else
 728			spin_unlock(&cfile->file_info_lock);
 729		if (cfile->srch_inf.ntwrk_buf_start) {
 730			cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
 731			if (cfile->srch_inf.smallBuf)
 732				cifs_small_buf_release(cfile->srch_inf.
 733						ntwrk_buf_start);
 734			else
 735				cifs_buf_release(cfile->srch_inf.
 736						ntwrk_buf_start);
 737			/* Reset all pointers to the network buffer to prevent stale references */
 738			cfile->srch_inf.ntwrk_buf_start = NULL;
 739			cfile->srch_inf.srch_entries_start = NULL;
 740			cfile->srch_inf.last_entry = NULL;
 741		}
 742		rc = initiate_cifs_search(xid, file, full_path);
 743		if (rc) {
 744			cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
 745				 rc);
 746			return rc;
 747		}
 748		/* FindFirst/Next set last_entry to NULL on malformed reply */
 749		if (cfile->srch_inf.last_entry)
 750			cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
 751	}
 752
 753	search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
 754	if (backup_cred(cifs_sb))
 755		search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
 756
 757	while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
 758	       (rc == 0) && !cfile->srch_inf.endOfSearch) {
 759		cifs_dbg(FYI, "calling findnext2\n");
 760		rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
 761						 search_flags,
 762						 &cfile->srch_inf);
 763		if (rc)
 764			return -ENOENT;
 765		/* FindFirst/Next set last_entry to NULL on malformed reply */
 766		if (cfile->srch_inf.last_entry)
 767			cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
 768	}
 769	if (index_to_find < cfile->srch_inf.index_of_last_entry) {
 770		/* we found the buffer that contains the entry */
 771		/* scan and find it */
 772		int i;
 773		char *cur_ent;
 774		char *end_of_smb;
 775
 776		if (cfile->srch_inf.ntwrk_buf_start == NULL) {
 777			cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n");
 778			return smb_EIO(smb_eio_trace_null_pointers);
 779		}
 780
 781		end_of_smb = cfile->srch_inf.ntwrk_buf_start +
 782			server->ops->calc_smb_size(
 783					cfile->srch_inf.ntwrk_buf_start);
 784
 785		cur_ent = cfile->srch_inf.srch_entries_start;
 786		first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
 787					- cfile->srch_inf.entries_in_buffer;
 788		pos_in_buf = index_to_find - first_entry_in_buffer;
 789		cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
 790
 791		for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
 792			/* go entry by entry figuring out which is first */
 793			cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
 794						cfile->srch_inf.info_level);
 795		}
 796		if ((cur_ent == NULL) && (i < pos_in_buf)) {
 797			/* BB fixme - check if we should flag this error */
 798			cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
 799				 pos_in_buf, index_to_find, rc);
 800		}
 801		rc = 0;
 802		*current_entry = cur_ent;
 803	} else {
 804		cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
 805		return 0;
 806	}
 807
 808	if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
 809		cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
 810		*num_to_ret = 0;
 811	} else
 812		*num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
 813
 814	return rc;
 815}
 816
 817static bool emit_cached_dirents(struct cached_dirents *cde,
 818				struct dir_context *ctx)
 819{
 820	struct cached_dirent *dirent;
 821	bool rc;
 822
 823	list_for_each_entry(dirent, &cde->entries, entry) {
 824		/*
 825		 * Skip all early entries prior to the current lseek()
 826		 * position.
 827		 */
 828		if (ctx->pos > dirent->pos)
 829			continue;
 830		/*
 831		 * We recorded the current ->pos value for the dirent
 832		 * when we stored it in the cache.
 833		 * However, this sequence of ->pos values may have holes
 834		 * in it, for example dot-dirs returned from the server
 835		 * are suppressed.
 836		 * Handle this by forcing ctx->pos to be the same as the
 837		 * ->pos of the current dirent we emit from the cache.
 838		 * This means that when we emit these entries from the cache
 839		 * we now emit them with the same ->pos value as in the
 840		 * initial scan.
 841		 */
 842		ctx->pos = dirent->pos;
 843		rc = dir_emit(ctx, dirent->name, dirent->namelen,
 844			      dirent->fattr.cf_uniqueid,
 845			      dirent->fattr.cf_dtype);
 846		if (!rc)
 847			return rc;
 848		ctx->pos++;
 849	}
 850	return true;
 851}
 852
 853static void update_cached_dirents_count(struct cached_dirents *cde,
 854					struct file *file)
 855{
 856	if (cde->file != file)
 857		return;
 858	if (cde->is_valid || cde->is_failed)
 859		return;
 860
 861	cde->pos++;
 862}
 863
 864static void finished_cached_dirents_count(struct cached_dirents *cde,
 865					struct dir_context *ctx, struct file *file)
 866{
 867	if (cde->file != file)
 868		return;
 869	if (cde->is_valid || cde->is_failed)
 870		return;
 871	if (ctx->pos != cde->pos)
 872		return;
 873
 874	cde->is_valid = 1;
 875}
 876
 877static bool add_cached_dirent(struct cached_dirents *cde,
 878			      struct dir_context *ctx, const char *name,
 879			      int namelen, struct cifs_fattr *fattr,
 880			      struct file *file)
 881{
 882	struct cached_dirent *de;
 883
 884	if (cde->file != file)
 885		return false;
 886	if (cde->is_valid || cde->is_failed)
 887		return false;
 888	if (ctx->pos != cde->pos) {
 889		cde->is_failed = 1;
 890		return false;
 891	}
 892	de = kzalloc(sizeof(*de), GFP_ATOMIC);
 893	if (de == NULL) {
 894		cde->is_failed = 1;
 895		return false;
 896	}
 897	de->namelen = namelen;
 898	de->name = kstrndup(name, namelen, GFP_ATOMIC);
 899	if (de->name == NULL) {
 900		kfree(de);
 901		cde->is_failed = 1;
 902		return false;
 903	}
 904	de->pos = ctx->pos;
 905
 906	memcpy(&de->fattr, fattr, sizeof(struct cifs_fattr));
 907
 908	list_add_tail(&de->entry, &cde->entries);
 909	/* update accounting */
 910	cde->entries_count++;
 911	cde->bytes_used += sizeof(*de) + (size_t)namelen + 1;
 912	return true;
 913}
 914
 915static bool cifs_dir_emit(struct dir_context *ctx,
 916			  const char *name, int namelen,
 917			  struct cifs_fattr *fattr,
 918			  struct cached_fid *cfid,
 919			  struct file *file)
 920{
 921	size_t delta_bytes = 0;
 922	bool rc, added = false;
 923	ino_t ino = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
 924
 925	rc = dir_emit(ctx, name, namelen, ino, fattr->cf_dtype);
 926	if (!rc)
 927		return rc;
 928
 929	if (cfid) {
 930		/* Cost of this entry */
 931		delta_bytes = sizeof(struct cached_dirent) + (size_t)namelen + 1;
 932
 933		mutex_lock(&cfid->dirents.de_mutex);
 934		added = add_cached_dirent(&cfid->dirents, ctx, name, namelen,
 935					  fattr, file);
 936		mutex_unlock(&cfid->dirents.de_mutex);
 937
 938		if (added) {
 939			/* per-tcon then global for consistency with free path */
 940			atomic64_add((long long)delta_bytes, &cfid->cfids->total_dirents_bytes);
 941			atomic_long_inc(&cfid->cfids->total_dirents_entries);
 942			atomic64_add((long long)delta_bytes, &cifs_dircache_bytes_used);
 943		}
 944	}
 945
 946	return rc;
 947}
 948
 949static int cifs_filldir(char *find_entry, struct file *file,
 950			struct dir_context *ctx,
 951			char *scratch_buf, unsigned int max_len,
 952			struct cached_fid *cfid)
 953{
 954	struct cifsFileInfo *file_info = file->private_data;
 955	struct super_block *sb = file_inode(file)->i_sb;
 956	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 957	struct cifs_dirent de = { NULL, };
 958	struct cifs_fattr fattr;
 959	struct qstr name;
 960	int rc = 0;
 961
 962	rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
 963			      file_info->srch_inf.unicode);
 964	if (rc)
 965		return rc;
 966
 967	if (de.namelen > max_len) {
 968		cifs_dbg(VFS, "bad search response length %zd past smb end\n",
 969			 de.namelen);
 970		return -EINVAL;
 971	}
 972
 973	/* skip . and .. since we added them first */
 974	if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
 975		return 0;
 976
 977	if (file_info->srch_inf.unicode) {
 978		struct nls_table *nlt = cifs_sb->local_nls;
 979		int map_type;
 980
 981		map_type = cifs_remap(cifs_sb);
 982		name.name = scratch_buf;
 983		name.len =
 984			cifs_from_utf16((char *)name.name, (__le16 *)de.name,
 985					UNICODE_NAME_MAX,
 986					min_t(size_t, de.namelen,
 987					      (size_t)max_len), nlt, map_type);
 988		name.len -= nls_nullsize(nlt);
 989	} else {
 990		name.name = de.name;
 991		name.len = de.namelen;
 992	}
 993
 994	switch (file_info->srch_inf.info_level) {
 995	case SMB_FIND_FILE_POSIX_INFO:
 996		cifs_posix_to_fattr(&fattr,
 997				    (struct smb2_posix_info *)find_entry,
 998				    cifs_sb);
 999		break;
1000	case SMB_FIND_FILE_UNIX:
1001		cifs_unix_basic_to_fattr(&fattr,
1002					 &((FILE_UNIX_INFO *)find_entry)->basic,
1003					 cifs_sb);
1004		if (S_ISLNK(fattr.cf_mode))
1005			fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1006		break;
1007	case SMB_FIND_FILE_INFO_STANDARD:
1008		cifs_std_info_to_fattr(&fattr,
1009				       (FIND_FILE_STANDARD_INFO *)find_entry,
1010				       cifs_sb);
1011		break;
1012	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
1013	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1014		cifs_fulldir_info_to_fattr(&fattr, find_entry, cifs_sb);
1015		break;
1016	default:
1017		cifs_dir_info_to_fattr(&fattr,
1018				       (FILE_DIRECTORY_INFO *)find_entry,
1019				       cifs_sb);
1020		break;
1021	}
1022
1023	if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
1024		fattr.cf_uniqueid = de.ino;
1025	} else {
1026		fattr.cf_uniqueid = iunique(sb, ROOT_I);
1027		cifs_autodisable_serverino(cifs_sb);
1028	}
1029
1030	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
1031	    couldbe_mf_symlink(&fattr))
1032		/*
1033		 * trying to get the type and mode can be slow,
1034		 * so just call those regular files for now, and mark
1035		 * for reval
1036		 */
1037		fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1038
1039	cifs_prime_dcache(file_dentry(file), &name, &fattr);
1040
1041	return !cifs_dir_emit(ctx, name.name, name.len,
1042			      &fattr, cfid, file);
1043}
1044
1045
1046int cifs_readdir(struct file *file, struct dir_context *ctx)
1047{
1048	int rc = 0;
1049	unsigned int xid;
1050	int i;
1051	struct tcon_link *tlink = NULL;
1052	struct cifs_tcon *tcon;
1053	struct cifsFileInfo *cifsFile;
1054	char *current_entry;
1055	int num_to_fill = 0;
1056	char *tmp_buf = NULL;
1057	char *end_of_smb;
1058	unsigned int max_len;
1059	const char *full_path;
1060	void *page = alloc_dentry_path();
1061	struct cached_fid *cfid = NULL;
1062	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
1063
1064	xid = get_xid();
1065
1066	full_path = build_path_from_dentry(file_dentry(file), page);
1067	if (IS_ERR(full_path)) {
1068		rc = PTR_ERR(full_path);
1069		goto rddir2_exit;
1070	}
1071
1072	if (file->private_data == NULL) {
1073		tlink = cifs_sb_tlink(cifs_sb);
1074		if (IS_ERR(tlink))
1075			goto cache_not_found;
1076		tcon = tlink_tcon(tlink);
1077	} else {
1078		cifsFile = file->private_data;
1079		tcon = tlink_tcon(cifsFile->tlink);
1080	}
1081
1082	rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1083	cifs_put_tlink(tlink);
1084	if (rc)
1085		goto cache_not_found;
1086
1087	mutex_lock(&cfid->dirents.de_mutex);
1088	/*
1089	 * If this was reading from the start of the directory
1090	 * we need to initialize scanning and storing the
1091	 * directory content.
1092	 */
1093	if (ctx->pos == 0 && cfid->dirents.file == NULL) {
1094		cfid->dirents.file = file;
1095		cfid->dirents.pos = 2;
1096	}
1097	/*
1098	 * If we already have the entire directory cached then
1099	 * we can just serve the cache.
1100	 */
1101	if (cfid->dirents.is_valid) {
1102		if (!dir_emit_dots(file, ctx)) {
1103			mutex_unlock(&cfid->dirents.de_mutex);
1104			goto rddir2_exit;
1105		}
1106		emit_cached_dirents(&cfid->dirents, ctx);
1107		mutex_unlock(&cfid->dirents.de_mutex);
1108		goto rddir2_exit;
1109	}
1110	mutex_unlock(&cfid->dirents.de_mutex);
1111
1112	/* Drop the cache while calling initiate_cifs_search and
1113	 * find_cifs_entry in case there will be reconnects during
1114	 * query_directory.
1115	 */
1116	close_cached_dir(cfid);
1117	cfid = NULL;
1118
1119 cache_not_found:
1120	/*
1121	 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
1122	 * '..'. Otherwise we won't be able to notify VFS in case of failure.
1123	 */
1124	if (file->private_data == NULL) {
1125		rc = initiate_cifs_search(xid, file, full_path);
1126		cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
1127		if (rc)
1128			goto rddir2_exit;
1129	}
1130
1131	if (!dir_emit_dots(file, ctx))
1132		goto rddir2_exit;
1133
1134	/* 1) If search is active,
1135		is in current search buffer?
1136		if it before then restart search
1137		if after then keep searching till find it */
1138	cifsFile = file->private_data;
1139	if (cifsFile->srch_inf.endOfSearch) {
1140		if (cifsFile->srch_inf.emptyDir) {
1141			cifs_dbg(FYI, "End of search, empty dir\n");
1142			rc = 0;
1143			goto rddir2_exit;
1144		}
1145	} /* else {
1146		cifsFile->invalidHandle = true;
1147		tcon->ses->server->close(xid, tcon, &cifsFile->fid);
1148	} */
1149
1150	tcon = tlink_tcon(cifsFile->tlink);
1151	rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
1152			     &current_entry, &num_to_fill);
1153	open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1154	if (rc) {
1155		cifs_dbg(FYI, "fce error %d\n", rc);
1156		goto rddir2_exit;
1157	} else if (current_entry != NULL) {
1158		cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
1159	} else {
1160		if (cfid) {
1161			mutex_lock(&cfid->dirents.de_mutex);
1162			finished_cached_dirents_count(&cfid->dirents, ctx, file);
1163			mutex_unlock(&cfid->dirents.de_mutex);
1164		}
1165		cifs_dbg(FYI, "Could not find entry\n");
1166		goto rddir2_exit;
1167	}
1168	cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
1169		 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
1170	max_len = tcon->ses->server->ops->calc_smb_size(
1171			cifsFile->srch_inf.ntwrk_buf_start);
1172	end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1173
1174	tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1175	if (tmp_buf == NULL) {
1176		rc = -ENOMEM;
1177		goto rddir2_exit;
1178	}
1179
1180	for (i = 0; i < num_to_fill; i++) {
1181		if (current_entry == NULL) {
1182			/* evaluate whether this case is an error */
1183			cifs_dbg(VFS, "past SMB end,  num to fill %d i %d\n",
1184				 num_to_fill, i);
1185			break;
1186		}
1187		/*
1188		 * if buggy server returns . and .. late do we want to
1189		 * check for that here?
1190		 */
1191		*tmp_buf = 0;
1192		rc = cifs_filldir(current_entry, file, ctx,
1193				  tmp_buf, max_len, cfid);
1194		if (rc) {
1195			if (rc > 0)
1196				rc = 0;
1197			break;
1198		}
1199
1200		ctx->pos++;
1201		if (cfid) {
1202			mutex_lock(&cfid->dirents.de_mutex);
1203			update_cached_dirents_count(&cfid->dirents, file);
1204			mutex_unlock(&cfid->dirents.de_mutex);
1205		}
1206
1207		if (ctx->pos ==
1208			cifsFile->srch_inf.index_of_last_entry) {
1209			cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
1210				 ctx->pos, tmp_buf);
1211			cifs_save_resume_key(current_entry, cifsFile);
1212			break;
1213		}
1214		current_entry =
1215			nxt_dir_entry(current_entry, end_of_smb,
1216				      cifsFile->srch_inf.info_level);
1217	}
1218	kfree(tmp_buf);
1219
1220rddir2_exit:
1221	if (cfid)
1222		close_cached_dir(cfid);
1223	free_dentry_path(page);
1224	free_xid(xid);
1225	return rc;
1226}