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0001 // SPDX-License-Identifier: LGPL-2.1
0002 /*
0003  *
0004  *   Directory search handling
0005  *
0006  *   Copyright (C) International Business Machines  Corp., 2004, 2008
0007  *   Copyright (C) Red Hat, Inc., 2011
0008  *   Author(s): Steve French (sfrench@us.ibm.com)
0009  *
0010  */
0011 #include <linux/fs.h>
0012 #include <linux/pagemap.h>
0013 #include <linux/slab.h>
0014 #include <linux/stat.h>
0015 #include "cifspdu.h"
0016 #include "cifsglob.h"
0017 #include "cifsproto.h"
0018 #include "cifs_unicode.h"
0019 #include "cifs_debug.h"
0020 #include "cifs_fs_sb.h"
0021 #include "cifsfs.h"
0022 #include "smb2proto.h"
0023 #include "fs_context.h"
0024 #include "cached_dir.h"
0025 
0026 /*
0027  * To be safe - for UCS to UTF-8 with strings loaded with the rare long
0028  * characters alloc more to account for such multibyte target UTF-8
0029  * characters.
0030  */
0031 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
0032 
0033 #ifdef CONFIG_CIFS_DEBUG2
0034 static void dump_cifs_file_struct(struct file *file, char *label)
0035 {
0036     struct cifsFileInfo *cf;
0037 
0038     if (file) {
0039         cf = file->private_data;
0040         if (cf == NULL) {
0041             cifs_dbg(FYI, "empty cifs private file data\n");
0042             return;
0043         }
0044         if (cf->invalidHandle)
0045             cifs_dbg(FYI, "Invalid handle\n");
0046         if (cf->srch_inf.endOfSearch)
0047             cifs_dbg(FYI, "end of search\n");
0048         if (cf->srch_inf.emptyDir)
0049             cifs_dbg(FYI, "empty dir\n");
0050     }
0051 }
0052 #else
0053 static inline void dump_cifs_file_struct(struct file *file, char *label)
0054 {
0055 }
0056 #endif /* DEBUG2 */
0057 
0058 /*
0059  * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
0060  *
0061  * Find the dentry that matches "name". If there isn't one, create one. If it's
0062  * a negative dentry or the uniqueid or filetype(mode) changed,
0063  * then drop it and recreate it.
0064  */
0065 static void
0066 cifs_prime_dcache(struct dentry *parent, struct qstr *name,
0067             struct cifs_fattr *fattr)
0068 {
0069     struct dentry *dentry, *alias;
0070     struct inode *inode;
0071     struct super_block *sb = parent->d_sb;
0072     struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
0073     DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
0074 
0075     cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
0076 
0077     dentry = d_hash_and_lookup(parent, name);
0078     if (!dentry) {
0079         /*
0080          * If we know that the inode will need to be revalidated
0081          * immediately, then don't create a new dentry for it.
0082          * We'll end up doing an on the wire call either way and
0083          * this spares us an invalidation.
0084          */
0085         if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
0086             return;
0087 retry:
0088         dentry = d_alloc_parallel(parent, name, &wq);
0089     }
0090     if (IS_ERR(dentry))
0091         return;
0092     if (!d_in_lookup(dentry)) {
0093         inode = d_inode(dentry);
0094         if (inode) {
0095             if (d_mountpoint(dentry)) {
0096                 dput(dentry);
0097                 return;
0098             }
0099             /*
0100              * If we're generating inode numbers, then we don't
0101              * want to clobber the existing one with the one that
0102              * the readdir code created.
0103              */
0104             if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
0105                 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
0106 
0107             /* update inode in place
0108              * if both i_ino and i_mode didn't change */
0109             if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
0110                 cifs_fattr_to_inode(inode, fattr) == 0) {
0111                 dput(dentry);
0112                 return;
0113             }
0114         }
0115         d_invalidate(dentry);
0116         dput(dentry);
0117         goto retry;
0118     } else {
0119         inode = cifs_iget(sb, fattr);
0120         if (!inode)
0121             inode = ERR_PTR(-ENOMEM);
0122         alias = d_splice_alias(inode, dentry);
0123         d_lookup_done(dentry);
0124         if (alias && !IS_ERR(alias))
0125             dput(alias);
0126     }
0127     dput(dentry);
0128 }
0129 
0130 static bool reparse_file_needs_reval(const struct cifs_fattr *fattr)
0131 {
0132     if (!(fattr->cf_cifsattrs & ATTR_REPARSE))
0133         return false;
0134     /*
0135      * The DFS tags should be only intepreted by server side as per
0136      * MS-FSCC 2.1.2.1, but let's include them anyway.
0137      *
0138      * Besides, if cf_cifstag is unset (0), then we still need it to be
0139      * revalidated to know exactly what reparse point it is.
0140      */
0141     switch (fattr->cf_cifstag) {
0142     case IO_REPARSE_TAG_DFS:
0143     case IO_REPARSE_TAG_DFSR:
0144     case IO_REPARSE_TAG_SYMLINK:
0145     case IO_REPARSE_TAG_NFS:
0146     case 0:
0147         return true;
0148     }
0149     return false;
0150 }
0151 
0152 static void
0153 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
0154 {
0155     fattr->cf_uid = cifs_sb->ctx->linux_uid;
0156     fattr->cf_gid = cifs_sb->ctx->linux_gid;
0157 
0158     /*
0159      * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
0160      * are preferred by the Linux client in some cases since, unlike
0161      * the NFS reparse tag (or EAs), they don't require an extra query
0162      * to determine which type of special file they represent.
0163      * TODO: go through all documented  reparse tags to see if we can
0164      * reasonably map some of them to directories vs. files vs. symlinks
0165      */
0166     if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
0167         fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
0168         fattr->cf_dtype = DT_DIR;
0169     } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_SYMLINK) {
0170         fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
0171         fattr->cf_dtype = DT_LNK;
0172     } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_FIFO) {
0173         fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
0174         fattr->cf_dtype = DT_FIFO;
0175     } else if (fattr->cf_cifstag == IO_REPARSE_TAG_AF_UNIX) {
0176         fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
0177         fattr->cf_dtype = DT_SOCK;
0178     } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_CHR) {
0179         fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
0180         fattr->cf_dtype = DT_CHR;
0181     } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_BLK) {
0182         fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
0183         fattr->cf_dtype = DT_BLK;
0184     } else { /* TODO: should we mark some other reparse points (like DFSR) as directories? */
0185         fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
0186         fattr->cf_dtype = DT_REG;
0187     }
0188 
0189     /*
0190      * We need to revalidate it further to make a decision about whether it
0191      * is a symbolic link, DFS referral or a reparse point with a direct
0192      * access like junctions, deduplicated files, NFS symlinks.
0193      */
0194     if (reparse_file_needs_reval(fattr))
0195         fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
0196 
0197     /* non-unix readdir doesn't provide nlink */
0198     fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
0199 
0200     if (fattr->cf_cifsattrs & ATTR_READONLY)
0201         fattr->cf_mode &= ~S_IWUGO;
0202 
0203     /*
0204      * We of course don't get ACL info in FIND_FIRST/NEXT results, so
0205      * mark it for revalidation so that "ls -l" will look right. It might
0206      * be super-slow, but if we don't do this then the ownership of files
0207      * may look wrong since the inodes may not have timed out by the time
0208      * "ls" does a stat() call on them.
0209      */
0210     if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
0211         (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
0212         fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
0213 
0214     if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
0215         fattr->cf_cifsattrs & ATTR_SYSTEM) {
0216         if (fattr->cf_eof == 0)  {
0217             fattr->cf_mode &= ~S_IFMT;
0218             fattr->cf_mode |= S_IFIFO;
0219             fattr->cf_dtype = DT_FIFO;
0220         } else {
0221             /*
0222              * trying to get the type and mode via SFU can be slow,
0223              * so just call those regular files for now, and mark
0224              * for reval
0225              */
0226             fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
0227         }
0228     }
0229 }
0230 
0231 /* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
0232 static void
0233 cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
0234             struct cifs_sb_info *cifs_sb)
0235 {
0236     struct smb2_posix_info_parsed parsed;
0237 
0238     posix_info_parse(info, NULL, &parsed);
0239 
0240     memset(fattr, 0, sizeof(*fattr));
0241     fattr->cf_uniqueid = le64_to_cpu(info->Inode);
0242     fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
0243     fattr->cf_eof = le64_to_cpu(info->EndOfFile);
0244 
0245     fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
0246     fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
0247     fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
0248 
0249     fattr->cf_nlink = le32_to_cpu(info->HardLinks);
0250     fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
0251 
0252     /*
0253      * Since we set the inode type below we need to mask off
0254      * to avoid strange results if bits set above.
0255      * XXX: why not make server&client use the type bits?
0256      */
0257     fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT;
0258 
0259     cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
0260          le32_to_cpu(info->DeviceId),
0261          le32_to_cpu(info->ReparseTag),
0262          le32_to_cpu(info->Mode));
0263 
0264     if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
0265         fattr->cf_mode |= S_IFDIR;
0266         fattr->cf_dtype = DT_DIR;
0267     } else {
0268         /*
0269          * mark anything that is not a dir as regular
0270          * file. special files should have the REPARSE
0271          * attribute and will be marked as needing revaluation
0272          */
0273         fattr->cf_mode |= S_IFREG;
0274         fattr->cf_dtype = DT_REG;
0275     }
0276 
0277     if (reparse_file_needs_reval(fattr))
0278         fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
0279 
0280     sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
0281     sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
0282 }
0283 
0284 static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
0285 {
0286     const FILE_DIRECTORY_INFO *fi = info;
0287 
0288     memset(fattr, 0, sizeof(*fattr));
0289     fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
0290     fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
0291     fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
0292     fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
0293     fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
0294     fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
0295     fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
0296 }
0297 
0298 void
0299 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
0300                struct cifs_sb_info *cifs_sb)
0301 {
0302     __dir_info_to_fattr(fattr, info);
0303     cifs_fill_common_info(fattr, cifs_sb);
0304 }
0305 
0306 static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
0307                        SEARCH_ID_FULL_DIR_INFO *info,
0308                        struct cifs_sb_info *cifs_sb)
0309 {
0310     __dir_info_to_fattr(fattr, info);
0311 
0312     /* See MS-FSCC 2.4.19 FileIdFullDirectoryInformation */
0313     if (fattr->cf_cifsattrs & ATTR_REPARSE)
0314         fattr->cf_cifstag = le32_to_cpu(info->EaSize);
0315     cifs_fill_common_info(fattr, cifs_sb);
0316 }
0317 
0318 static void
0319 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
0320                struct cifs_sb_info *cifs_sb)
0321 {
0322     int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
0323 
0324     memset(fattr, 0, sizeof(*fattr));
0325     fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
0326                         info->LastAccessTime, offset);
0327     fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
0328                         info->LastWriteTime, offset);
0329     fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
0330                         info->LastWriteTime, offset);
0331 
0332     fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
0333     fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
0334     fattr->cf_eof = le32_to_cpu(info->DataSize);
0335 
0336     cifs_fill_common_info(fattr, cifs_sb);
0337 }
0338 
0339 /* BB eventually need to add the following helper function to
0340       resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
0341       we try to do FindFirst on (NTFS) directory symlinks */
0342 /*
0343 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
0344                  unsigned int xid)
0345 {
0346     __u16 fid;
0347     int len;
0348     int oplock = 0;
0349     int rc;
0350     struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
0351     char *tmpbuffer;
0352 
0353     rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
0354             OPEN_REPARSE_POINT, &fid, &oplock, NULL,
0355             cifs_sb->local_nls,
0356             cifs_remap(cifs_sb);
0357     if (!rc) {
0358         tmpbuffer = kmalloc(maxpath);
0359         rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
0360                 tmpbuffer,
0361                 maxpath -1,
0362                 fid,
0363                 cifs_sb->local_nls);
0364         if (CIFSSMBClose(xid, ptcon, fid)) {
0365             cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
0366         }
0367     }
0368 }
0369  */
0370 
0371 static int
0372 _initiate_cifs_search(const unsigned int xid, struct file *file,
0373              const char *full_path)
0374 {
0375     __u16 search_flags;
0376     int rc = 0;
0377     struct cifsFileInfo *cifsFile;
0378     struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
0379     struct tcon_link *tlink = NULL;
0380     struct cifs_tcon *tcon;
0381     struct TCP_Server_Info *server;
0382 
0383     if (file->private_data == NULL) {
0384         tlink = cifs_sb_tlink(cifs_sb);
0385         if (IS_ERR(tlink))
0386             return PTR_ERR(tlink);
0387 
0388         cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
0389         if (cifsFile == NULL) {
0390             rc = -ENOMEM;
0391             goto error_exit;
0392         }
0393         spin_lock_init(&cifsFile->file_info_lock);
0394         file->private_data = cifsFile;
0395         cifsFile->tlink = cifs_get_tlink(tlink);
0396         tcon = tlink_tcon(tlink);
0397     } else {
0398         cifsFile = file->private_data;
0399         tcon = tlink_tcon(cifsFile->tlink);
0400     }
0401 
0402     server = tcon->ses->server;
0403 
0404     if (!server->ops->query_dir_first) {
0405         rc = -ENOSYS;
0406         goto error_exit;
0407     }
0408 
0409     cifsFile->invalidHandle = true;
0410     cifsFile->srch_inf.endOfSearch = false;
0411 
0412     cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
0413 
0414 ffirst_retry:
0415     /* test for Unix extensions */
0416     /* but now check for them on the share/mount not on the SMB session */
0417     /* if (cap_unix(tcon->ses) { */
0418     if (tcon->unix_ext)
0419         cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
0420     else if (tcon->posix_extensions)
0421         cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
0422     else if ((tcon->ses->capabilities &
0423           tcon->ses->server->vals->cap_nt_find) == 0) {
0424         cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
0425     } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
0426         cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
0427     } else /* not srvinos - BB fixme add check for backlevel? */ {
0428         cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
0429     }
0430 
0431     search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
0432     if (backup_cred(cifs_sb))
0433         search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
0434 
0435     rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
0436                       &cifsFile->fid, search_flags,
0437                       &cifsFile->srch_inf);
0438 
0439     if (rc == 0)
0440         cifsFile->invalidHandle = false;
0441     /* BB add following call to handle readdir on new NTFS symlink errors
0442     else if STATUS_STOPPED_ON_SYMLINK
0443         call get_symlink_reparse_path and retry with new path */
0444     else if ((rc == -EOPNOTSUPP) &&
0445         (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
0446         cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
0447         goto ffirst_retry;
0448     }
0449 error_exit:
0450     cifs_put_tlink(tlink);
0451     return rc;
0452 }
0453 
0454 static int
0455 initiate_cifs_search(const unsigned int xid, struct file *file,
0456              const char *full_path)
0457 {
0458     int rc, retry_count = 0;
0459 
0460     do {
0461         rc = _initiate_cifs_search(xid, file, full_path);
0462         /*
0463          * If we don't have enough credits to start reading the
0464          * directory just try again after short wait.
0465          */
0466         if (rc != -EDEADLK)
0467             break;
0468 
0469         usleep_range(512, 2048);
0470     } while (retry_count++ < 5);
0471 
0472     return rc;
0473 }
0474 
0475 /* return length of unicode string in bytes */
0476 static int cifs_unicode_bytelen(const char *str)
0477 {
0478     int len;
0479     const __le16 *ustr = (const __le16 *)str;
0480 
0481     for (len = 0; len <= PATH_MAX; len++) {
0482         if (ustr[len] == 0)
0483             return len << 1;
0484     }
0485     cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
0486     return len << 1;
0487 }
0488 
0489 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
0490 {
0491     char *new_entry;
0492     FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
0493 
0494     if (level == SMB_FIND_FILE_INFO_STANDARD) {
0495         FIND_FILE_STANDARD_INFO *pfData;
0496         pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
0497 
0498         new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
0499                 pfData->FileNameLength;
0500     } else {
0501         u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
0502 
0503         if (old_entry + next_offset < old_entry) {
0504             cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
0505             return NULL;
0506         }
0507         new_entry = old_entry + next_offset;
0508     }
0509     cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
0510     /* validate that new_entry is not past end of SMB */
0511     if (new_entry >= end_of_smb) {
0512         cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
0513              new_entry, end_of_smb, old_entry);
0514         return NULL;
0515     } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
0516             (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
0517           || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
0518            (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
0519         cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
0520              new_entry, end_of_smb);
0521         return NULL;
0522     } else
0523         return new_entry;
0524 
0525 }
0526 
0527 struct cifs_dirent {
0528     const char  *name;
0529     size_t      namelen;
0530     u32     resume_key;
0531     u64     ino;
0532 };
0533 
0534 static void cifs_fill_dirent_posix(struct cifs_dirent *de,
0535                    const struct smb2_posix_info *info)
0536 {
0537     struct smb2_posix_info_parsed parsed;
0538 
0539     /* payload should have already been checked at this point */
0540     if (posix_info_parse(info, NULL, &parsed) < 0) {
0541         cifs_dbg(VFS, "Invalid POSIX info payload\n");
0542         return;
0543     }
0544 
0545     de->name = parsed.name;
0546     de->namelen = parsed.name_len;
0547     de->resume_key = info->Ignored;
0548     de->ino = le64_to_cpu(info->Inode);
0549 }
0550 
0551 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
0552         const FILE_UNIX_INFO *info, bool is_unicode)
0553 {
0554     de->name = &info->FileName[0];
0555     if (is_unicode)
0556         de->namelen = cifs_unicode_bytelen(de->name);
0557     else
0558         de->namelen = strnlen(de->name, PATH_MAX);
0559     de->resume_key = info->ResumeKey;
0560     de->ino = le64_to_cpu(info->basic.UniqueId);
0561 }
0562 
0563 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
0564         const FILE_DIRECTORY_INFO *info)
0565 {
0566     de->name = &info->FileName[0];
0567     de->namelen = le32_to_cpu(info->FileNameLength);
0568     de->resume_key = info->FileIndex;
0569 }
0570 
0571 static void cifs_fill_dirent_full(struct cifs_dirent *de,
0572         const FILE_FULL_DIRECTORY_INFO *info)
0573 {
0574     de->name = &info->FileName[0];
0575     de->namelen = le32_to_cpu(info->FileNameLength);
0576     de->resume_key = info->FileIndex;
0577 }
0578 
0579 static void cifs_fill_dirent_search(struct cifs_dirent *de,
0580         const SEARCH_ID_FULL_DIR_INFO *info)
0581 {
0582     de->name = &info->FileName[0];
0583     de->namelen = le32_to_cpu(info->FileNameLength);
0584     de->resume_key = info->FileIndex;
0585     de->ino = le64_to_cpu(info->UniqueId);
0586 }
0587 
0588 static void cifs_fill_dirent_both(struct cifs_dirent *de,
0589         const FILE_BOTH_DIRECTORY_INFO *info)
0590 {
0591     de->name = &info->FileName[0];
0592     de->namelen = le32_to_cpu(info->FileNameLength);
0593     de->resume_key = info->FileIndex;
0594 }
0595 
0596 static void cifs_fill_dirent_std(struct cifs_dirent *de,
0597         const FIND_FILE_STANDARD_INFO *info)
0598 {
0599     de->name = &info->FileName[0];
0600     /* one byte length, no endianess conversion */
0601     de->namelen = info->FileNameLength;
0602     de->resume_key = info->ResumeKey;
0603 }
0604 
0605 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
0606         u16 level, bool is_unicode)
0607 {
0608     memset(de, 0, sizeof(*de));
0609 
0610     switch (level) {
0611     case SMB_FIND_FILE_POSIX_INFO:
0612         cifs_fill_dirent_posix(de, info);
0613         break;
0614     case SMB_FIND_FILE_UNIX:
0615         cifs_fill_dirent_unix(de, info, is_unicode);
0616         break;
0617     case SMB_FIND_FILE_DIRECTORY_INFO:
0618         cifs_fill_dirent_dir(de, info);
0619         break;
0620     case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
0621         cifs_fill_dirent_full(de, info);
0622         break;
0623     case SMB_FIND_FILE_ID_FULL_DIR_INFO:
0624         cifs_fill_dirent_search(de, info);
0625         break;
0626     case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
0627         cifs_fill_dirent_both(de, info);
0628         break;
0629     case SMB_FIND_FILE_INFO_STANDARD:
0630         cifs_fill_dirent_std(de, info);
0631         break;
0632     default:
0633         cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
0634         return -EINVAL;
0635     }
0636 
0637     return 0;
0638 }
0639 
0640 #define UNICODE_DOT cpu_to_le16(0x2e)
0641 
0642 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
0643 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
0644 {
0645     int rc = 0;
0646 
0647     if (!de->name)
0648         return 0;
0649 
0650     if (is_unicode) {
0651         __le16 *ufilename = (__le16 *)de->name;
0652         if (de->namelen == 2) {
0653             /* check for . */
0654             if (ufilename[0] == UNICODE_DOT)
0655                 rc = 1;
0656         } else if (de->namelen == 4) {
0657             /* check for .. */
0658             if (ufilename[0] == UNICODE_DOT &&
0659                 ufilename[1] == UNICODE_DOT)
0660                 rc = 2;
0661         }
0662     } else /* ASCII */ {
0663         if (de->namelen == 1) {
0664             if (de->name[0] == '.')
0665                 rc = 1;
0666         } else if (de->namelen == 2) {
0667             if (de->name[0] == '.' && de->name[1] == '.')
0668                 rc = 2;
0669         }
0670     }
0671 
0672     return rc;
0673 }
0674 
0675 /* Check if directory that we are searching has changed so we can decide
0676    whether we can use the cached search results from the previous search */
0677 static int is_dir_changed(struct file *file)
0678 {
0679     struct inode *inode = file_inode(file);
0680     struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
0681 
0682     if (cifsInfo->time == 0)
0683         return 1; /* directory was changed, perhaps due to unlink */
0684     else
0685         return 0;
0686 
0687 }
0688 
0689 static int cifs_save_resume_key(const char *current_entry,
0690     struct cifsFileInfo *file_info)
0691 {
0692     struct cifs_dirent de;
0693     int rc;
0694 
0695     rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
0696                   file_info->srch_inf.unicode);
0697     if (!rc) {
0698         file_info->srch_inf.presume_name = de.name;
0699         file_info->srch_inf.resume_name_len = de.namelen;
0700         file_info->srch_inf.resume_key = de.resume_key;
0701     }
0702     return rc;
0703 }
0704 
0705 /*
0706  * Find the corresponding entry in the search. Note that the SMB server returns
0707  * search entries for . and .. which complicates logic here if we choose to
0708  * parse for them and we do not assume that they are located in the findfirst
0709  * return buffer. We start counting in the buffer with entry 2 and increment for
0710  * every entry (do not increment for . or .. entry).
0711  */
0712 static int
0713 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
0714         struct file *file, const char *full_path,
0715         char **current_entry, int *num_to_ret)
0716 {
0717     __u16 search_flags;
0718     int rc = 0;
0719     int pos_in_buf = 0;
0720     loff_t first_entry_in_buffer;
0721     loff_t index_to_find = pos;
0722     struct cifsFileInfo *cfile = file->private_data;
0723     struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
0724     struct TCP_Server_Info *server = tcon->ses->server;
0725     /* check if index in the buffer */
0726 
0727     if (!server->ops->query_dir_first || !server->ops->query_dir_next)
0728         return -ENOSYS;
0729 
0730     if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
0731         return -ENOENT;
0732 
0733     *current_entry = NULL;
0734     first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
0735                     cfile->srch_inf.entries_in_buffer;
0736 
0737     /*
0738      * If first entry in buf is zero then is first buffer
0739      * in search response data which means it is likely . and ..
0740      * will be in this buffer, although some servers do not return
0741      * . and .. for the root of a drive and for those we need
0742      * to start two entries earlier.
0743      */
0744 
0745     dump_cifs_file_struct(file, "In fce ");
0746     if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
0747          is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
0748         /* close and restart search */
0749         cifs_dbg(FYI, "search backing up - close and restart search\n");
0750         spin_lock(&cfile->file_info_lock);
0751         if (server->ops->dir_needs_close(cfile)) {
0752             cfile->invalidHandle = true;
0753             spin_unlock(&cfile->file_info_lock);
0754             if (server->ops->close_dir)
0755                 server->ops->close_dir(xid, tcon, &cfile->fid);
0756         } else
0757             spin_unlock(&cfile->file_info_lock);
0758         if (cfile->srch_inf.ntwrk_buf_start) {
0759             cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
0760             if (cfile->srch_inf.smallBuf)
0761                 cifs_small_buf_release(cfile->srch_inf.
0762                         ntwrk_buf_start);
0763             else
0764                 cifs_buf_release(cfile->srch_inf.
0765                         ntwrk_buf_start);
0766             cfile->srch_inf.ntwrk_buf_start = NULL;
0767         }
0768         rc = initiate_cifs_search(xid, file, full_path);
0769         if (rc) {
0770             cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
0771                  rc);
0772             return rc;
0773         }
0774         /* FindFirst/Next set last_entry to NULL on malformed reply */
0775         if (cfile->srch_inf.last_entry)
0776             cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
0777     }
0778 
0779     search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
0780     if (backup_cred(cifs_sb))
0781         search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
0782 
0783     while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
0784            (rc == 0) && !cfile->srch_inf.endOfSearch) {
0785         cifs_dbg(FYI, "calling findnext2\n");
0786         rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
0787                          search_flags,
0788                          &cfile->srch_inf);
0789         /* FindFirst/Next set last_entry to NULL on malformed reply */
0790         if (cfile->srch_inf.last_entry)
0791             cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
0792         if (rc)
0793             return -ENOENT;
0794     }
0795     if (index_to_find < cfile->srch_inf.index_of_last_entry) {
0796         /* we found the buffer that contains the entry */
0797         /* scan and find it */
0798         int i;
0799         char *cur_ent;
0800         char *end_of_smb;
0801 
0802         if (cfile->srch_inf.ntwrk_buf_start == NULL) {
0803             cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n");
0804             return -EIO;
0805         }
0806 
0807         end_of_smb = cfile->srch_inf.ntwrk_buf_start +
0808             server->ops->calc_smb_size(
0809                     cfile->srch_inf.ntwrk_buf_start);
0810 
0811         cur_ent = cfile->srch_inf.srch_entries_start;
0812         first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
0813                     - cfile->srch_inf.entries_in_buffer;
0814         pos_in_buf = index_to_find - first_entry_in_buffer;
0815         cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
0816 
0817         for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
0818             /* go entry by entry figuring out which is first */
0819             cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
0820                         cfile->srch_inf.info_level);
0821         }
0822         if ((cur_ent == NULL) && (i < pos_in_buf)) {
0823             /* BB fixme - check if we should flag this error */
0824             cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
0825                  pos_in_buf, index_to_find, rc);
0826         }
0827         rc = 0;
0828         *current_entry = cur_ent;
0829     } else {
0830         cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
0831         return 0;
0832     }
0833 
0834     if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
0835         cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
0836         *num_to_ret = 0;
0837     } else
0838         *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
0839 
0840     return rc;
0841 }
0842 
0843 static bool emit_cached_dirents(struct cached_dirents *cde,
0844                 struct dir_context *ctx)
0845 {
0846     struct cached_dirent *dirent;
0847     int rc;
0848 
0849     list_for_each_entry(dirent, &cde->entries, entry) {
0850         if (ctx->pos >= dirent->pos)
0851             continue;
0852         ctx->pos = dirent->pos;
0853         rc = dir_emit(ctx, dirent->name, dirent->namelen,
0854                   dirent->fattr.cf_uniqueid,
0855                   dirent->fattr.cf_dtype);
0856         if (!rc)
0857             return rc;
0858     }
0859     return true;
0860 }
0861 
0862 static void update_cached_dirents_count(struct cached_dirents *cde,
0863                     struct dir_context *ctx)
0864 {
0865     if (cde->ctx != ctx)
0866         return;
0867     if (cde->is_valid || cde->is_failed)
0868         return;
0869 
0870     cde->pos++;
0871 }
0872 
0873 static void finished_cached_dirents_count(struct cached_dirents *cde,
0874                     struct dir_context *ctx)
0875 {
0876     if (cde->ctx != ctx)
0877         return;
0878     if (cde->is_valid || cde->is_failed)
0879         return;
0880     if (ctx->pos != cde->pos)
0881         return;
0882 
0883     cde->is_valid = 1;
0884 }
0885 
0886 static void add_cached_dirent(struct cached_dirents *cde,
0887                   struct dir_context *ctx,
0888                   const char *name, int namelen,
0889                   struct cifs_fattr *fattr)
0890 {
0891     struct cached_dirent *de;
0892 
0893     if (cde->ctx != ctx)
0894         return;
0895     if (cde->is_valid || cde->is_failed)
0896         return;
0897     if (ctx->pos != cde->pos) {
0898         cde->is_failed = 1;
0899         return;
0900     }
0901     de = kzalloc(sizeof(*de), GFP_ATOMIC);
0902     if (de == NULL) {
0903         cde->is_failed = 1;
0904         return;
0905     }
0906     de->namelen = namelen;
0907     de->name = kstrndup(name, namelen, GFP_ATOMIC);
0908     if (de->name == NULL) {
0909         kfree(de);
0910         cde->is_failed = 1;
0911         return;
0912     }
0913     de->pos = ctx->pos;
0914 
0915     memcpy(&de->fattr, fattr, sizeof(struct cifs_fattr));
0916 
0917     list_add_tail(&de->entry, &cde->entries);
0918 }
0919 
0920 static bool cifs_dir_emit(struct dir_context *ctx,
0921               const char *name, int namelen,
0922               struct cifs_fattr *fattr,
0923               struct cached_fid *cfid)
0924 {
0925     bool rc;
0926     ino_t ino = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
0927 
0928     rc = dir_emit(ctx, name, namelen, ino, fattr->cf_dtype);
0929     if (!rc)
0930         return rc;
0931 
0932     if (cfid) {
0933         mutex_lock(&cfid->dirents.de_mutex);
0934         add_cached_dirent(&cfid->dirents, ctx, name, namelen,
0935                   fattr);
0936         mutex_unlock(&cfid->dirents.de_mutex);
0937     }
0938 
0939     return rc;
0940 }
0941 
0942 static int cifs_filldir(char *find_entry, struct file *file,
0943             struct dir_context *ctx,
0944             char *scratch_buf, unsigned int max_len,
0945             struct cached_fid *cfid)
0946 {
0947     struct cifsFileInfo *file_info = file->private_data;
0948     struct super_block *sb = file_inode(file)->i_sb;
0949     struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
0950     struct cifs_dirent de = { NULL, };
0951     struct cifs_fattr fattr;
0952     struct qstr name;
0953     int rc = 0;
0954 
0955     rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
0956                   file_info->srch_inf.unicode);
0957     if (rc)
0958         return rc;
0959 
0960     if (de.namelen > max_len) {
0961         cifs_dbg(VFS, "bad search response length %zd past smb end\n",
0962              de.namelen);
0963         return -EINVAL;
0964     }
0965 
0966     /* skip . and .. since we added them first */
0967     if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
0968         return 0;
0969 
0970     if (file_info->srch_inf.unicode) {
0971         struct nls_table *nlt = cifs_sb->local_nls;
0972         int map_type;
0973 
0974         map_type = cifs_remap(cifs_sb);
0975         name.name = scratch_buf;
0976         name.len =
0977             cifs_from_utf16((char *)name.name, (__le16 *)de.name,
0978                     UNICODE_NAME_MAX,
0979                     min_t(size_t, de.namelen,
0980                           (size_t)max_len), nlt, map_type);
0981         name.len -= nls_nullsize(nlt);
0982     } else {
0983         name.name = de.name;
0984         name.len = de.namelen;
0985     }
0986 
0987     switch (file_info->srch_inf.info_level) {
0988     case SMB_FIND_FILE_POSIX_INFO:
0989         cifs_posix_to_fattr(&fattr,
0990                     (struct smb2_posix_info *)find_entry,
0991                     cifs_sb);
0992         break;
0993     case SMB_FIND_FILE_UNIX:
0994         cifs_unix_basic_to_fattr(&fattr,
0995                      &((FILE_UNIX_INFO *)find_entry)->basic,
0996                      cifs_sb);
0997         break;
0998     case SMB_FIND_FILE_INFO_STANDARD:
0999         cifs_std_info_to_fattr(&fattr,
1000                        (FIND_FILE_STANDARD_INFO *)find_entry,
1001                        cifs_sb);
1002         break;
1003     case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1004         cifs_fulldir_info_to_fattr(&fattr,
1005                        (SEARCH_ID_FULL_DIR_INFO *)find_entry,
1006                        cifs_sb);
1007         break;
1008     default:
1009         cifs_dir_info_to_fattr(&fattr,
1010                        (FILE_DIRECTORY_INFO *)find_entry,
1011                        cifs_sb);
1012         break;
1013     }
1014 
1015     if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
1016         fattr.cf_uniqueid = de.ino;
1017     } else {
1018         fattr.cf_uniqueid = iunique(sb, ROOT_I);
1019         cifs_autodisable_serverino(cifs_sb);
1020     }
1021 
1022     if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
1023         couldbe_mf_symlink(&fattr))
1024         /*
1025          * trying to get the type and mode can be slow,
1026          * so just call those regular files for now, and mark
1027          * for reval
1028          */
1029         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1030 
1031     cifs_prime_dcache(file_dentry(file), &name, &fattr);
1032 
1033     return !cifs_dir_emit(ctx, name.name, name.len,
1034                   &fattr, cfid);
1035 }
1036 
1037 
1038 int cifs_readdir(struct file *file, struct dir_context *ctx)
1039 {
1040     int rc = 0;
1041     unsigned int xid;
1042     int i;
1043     struct tcon_link *tlink = NULL;
1044     struct cifs_tcon *tcon;
1045     struct cifsFileInfo *cifsFile;
1046     char *current_entry;
1047     int num_to_fill = 0;
1048     char *tmp_buf = NULL;
1049     char *end_of_smb;
1050     unsigned int max_len;
1051     const char *full_path;
1052     void *page = alloc_dentry_path();
1053     struct cached_fid *cfid = NULL;
1054     struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
1055 
1056     xid = get_xid();
1057 
1058     full_path = build_path_from_dentry(file_dentry(file), page);
1059     if (IS_ERR(full_path)) {
1060         rc = PTR_ERR(full_path);
1061         goto rddir2_exit;
1062     }
1063 
1064     if (file->private_data == NULL) {
1065         tlink = cifs_sb_tlink(cifs_sb);
1066         if (IS_ERR(tlink))
1067             goto cache_not_found;
1068         tcon = tlink_tcon(tlink);
1069     } else {
1070         cifsFile = file->private_data;
1071         tcon = tlink_tcon(cifsFile->tlink);
1072     }
1073 
1074     rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1075     cifs_put_tlink(tlink);
1076     if (rc)
1077         goto cache_not_found;
1078 
1079     mutex_lock(&cfid->dirents.de_mutex);
1080     /*
1081      * If this was reading from the start of the directory
1082      * we need to initialize scanning and storing the
1083      * directory content.
1084      */
1085     if (ctx->pos == 0 && cfid->dirents.ctx == NULL) {
1086         cfid->dirents.ctx = ctx;
1087         cfid->dirents.pos = 2;
1088     }
1089     /*
1090      * If we already have the entire directory cached then
1091      * we can just serve the cache.
1092      */
1093     if (cfid->dirents.is_valid) {
1094         if (!dir_emit_dots(file, ctx)) {
1095             mutex_unlock(&cfid->dirents.de_mutex);
1096             goto rddir2_exit;
1097         }
1098         emit_cached_dirents(&cfid->dirents, ctx);
1099         mutex_unlock(&cfid->dirents.de_mutex);
1100         goto rddir2_exit;
1101     }
1102     mutex_unlock(&cfid->dirents.de_mutex);
1103 
1104     /* Drop the cache while calling initiate_cifs_search and
1105      * find_cifs_entry in case there will be reconnects during
1106      * query_directory.
1107      */
1108     close_cached_dir(cfid);
1109     cfid = NULL;
1110 
1111  cache_not_found:
1112     /*
1113      * Ensure FindFirst doesn't fail before doing filldir() for '.' and
1114      * '..'. Otherwise we won't be able to notify VFS in case of failure.
1115      */
1116     if (file->private_data == NULL) {
1117         rc = initiate_cifs_search(xid, file, full_path);
1118         cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
1119         if (rc)
1120             goto rddir2_exit;
1121     }
1122 
1123     if (!dir_emit_dots(file, ctx))
1124         goto rddir2_exit;
1125 
1126     /* 1) If search is active,
1127         is in current search buffer?
1128         if it before then restart search
1129         if after then keep searching till find it */
1130     cifsFile = file->private_data;
1131     if (cifsFile->srch_inf.endOfSearch) {
1132         if (cifsFile->srch_inf.emptyDir) {
1133             cifs_dbg(FYI, "End of search, empty dir\n");
1134             rc = 0;
1135             goto rddir2_exit;
1136         }
1137     } /* else {
1138         cifsFile->invalidHandle = true;
1139         tcon->ses->server->close(xid, tcon, &cifsFile->fid);
1140     } */
1141 
1142     tcon = tlink_tcon(cifsFile->tlink);
1143     rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
1144                  &current_entry, &num_to_fill);
1145     open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1146     if (rc) {
1147         cifs_dbg(FYI, "fce error %d\n", rc);
1148         goto rddir2_exit;
1149     } else if (current_entry != NULL) {
1150         cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
1151     } else {
1152         if (cfid) {
1153             mutex_lock(&cfid->dirents.de_mutex);
1154             finished_cached_dirents_count(&cfid->dirents, ctx);
1155             mutex_unlock(&cfid->dirents.de_mutex);
1156         }
1157         cifs_dbg(FYI, "Could not find entry\n");
1158         goto rddir2_exit;
1159     }
1160     cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
1161          num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
1162     max_len = tcon->ses->server->ops->calc_smb_size(
1163             cifsFile->srch_inf.ntwrk_buf_start);
1164     end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1165 
1166     tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1167     if (tmp_buf == NULL) {
1168         rc = -ENOMEM;
1169         goto rddir2_exit;
1170     }
1171 
1172     for (i = 0; i < num_to_fill; i++) {
1173         if (current_entry == NULL) {
1174             /* evaluate whether this case is an error */
1175             cifs_dbg(VFS, "past SMB end,  num to fill %d i %d\n",
1176                  num_to_fill, i);
1177             break;
1178         }
1179         /*
1180          * if buggy server returns . and .. late do we want to
1181          * check for that here?
1182          */
1183         *tmp_buf = 0;
1184         rc = cifs_filldir(current_entry, file, ctx,
1185                   tmp_buf, max_len, cfid);
1186         if (rc) {
1187             if (rc > 0)
1188                 rc = 0;
1189             break;
1190         }
1191 
1192         ctx->pos++;
1193         if (cfid) {
1194             mutex_lock(&cfid->dirents.de_mutex);
1195             update_cached_dirents_count(&cfid->dirents, ctx);
1196             mutex_unlock(&cfid->dirents.de_mutex);
1197         }
1198 
1199         if (ctx->pos ==
1200             cifsFile->srch_inf.index_of_last_entry) {
1201             cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
1202                  ctx->pos, tmp_buf);
1203             cifs_save_resume_key(current_entry, cifsFile);
1204             break;
1205         } else
1206             current_entry =
1207                 nxt_dir_entry(current_entry, end_of_smb,
1208                     cifsFile->srch_inf.info_level);
1209     }
1210     kfree(tmp_buf);
1211 
1212 rddir2_exit:
1213     if (cfid)
1214         close_cached_dir(cfid);
1215     free_dentry_path(page);
1216     free_xid(xid);
1217     return rc;
1218 }
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