/* * fs/cifs/readdir.c * * Directory search handling * * Copyright (C) International Business Machines Corp., 2004, 2008 * Copyright (C) Red Hat, Inc., 2011 * Author(s): Steve French (sfrench@us.ibm.com) * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include "cifspdu.h" #include "cifsglob.h" #include "cifsproto.h" #include "cifs_unicode.h" #include "cifs_debug.h" #include "cifs_fs_sb.h" #include "cifsfs.h" /* * To be safe - for UCS to UTF-8 with strings loaded with the rare long * characters alloc more to account for such multibyte target UTF-8 * characters. */ #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2) #ifdef CONFIG_CIFS_DEBUG2 static void dump_cifs_file_struct(struct file *file, char *label) { struct cifsFileInfo *cf; if (file) { cf = file->private_data; if (cf == NULL) { cFYI(1, "empty cifs private file data"); return; } if (cf->invalidHandle) cFYI(1, "invalid handle"); if (cf->srch_inf.endOfSearch) cFYI(1, "end of search"); if (cf->srch_inf.emptyDir) cFYI(1, "empty dir"); } } #else static inline void dump_cifs_file_struct(struct file *file, char *label) { } #endif /* DEBUG2 */ /* * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT * * Find the dentry that matches "name". If there isn't one, create one. If it's * a negative dentry or the uniqueid changed, then drop it and recreate it. */ static void cifs_prime_dcache(struct dentry *parent, struct qstr *name, struct cifs_fattr *fattr) { struct dentry *dentry, *alias; struct inode *inode; struct super_block *sb = parent->d_inode->i_sb; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); cFYI(1, "%s: for %s", __func__, name->name); if (parent->d_op && parent->d_op->d_hash) parent->d_op->d_hash(parent, parent->d_inode, name); else name->hash = full_name_hash(name->name, name->len); dentry = d_lookup(parent, name); if (dentry) { int err; inode = dentry->d_inode; if (inode) { /* * If we're generating inode numbers, then we don't * want to clobber the existing one with the one that * the readdir code created. */ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) fattr->cf_uniqueid = CIFS_I(inode)->uniqueid; /* update inode in place if i_ino didn't change */ if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { cifs_fattr_to_inode(inode, fattr); goto out; } } err = d_invalidate(dentry); dput(dentry); if (err) return; } dentry = d_alloc(parent, name); if (!dentry) return; inode = cifs_iget(sb, fattr); if (!inode) goto out; alias = d_materialise_unique(dentry, inode); if (alias && !IS_ERR(alias)) dput(alias); out: dput(dentry); } static void cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) { fattr->cf_uid = cifs_sb->mnt_uid; fattr->cf_gid = cifs_sb->mnt_gid; if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; fattr->cf_dtype = DT_DIR; } else { fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; fattr->cf_dtype = DT_REG; } if (fattr->cf_cifsattrs & ATTR_READONLY) fattr->cf_mode &= ~S_IWUGO; /* * We of course don't get ACL info in FIND_FIRST/NEXT results, so * mark it for revalidation so that "ls -l" will look right. It might * be super-slow, but if we don't do this then the ownership of files * may look wrong since the inodes may not have timed out by the time * "ls" does a stat() call on them. */ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && fattr->cf_cifsattrs & ATTR_SYSTEM) { if (fattr->cf_eof == 0) { fattr->cf_mode &= ~S_IFMT; fattr->cf_mode |= S_IFIFO; fattr->cf_dtype = DT_FIFO; } else { /* * trying to get the type and mode via SFU can be slow, * so just call those regular files for now, and mark * for reval */ fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; } } } void cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, struct cifs_sb_info *cifs_sb) { memset(fattr, 0, sizeof(*fattr)); fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes); fattr->cf_eof = le64_to_cpu(info->EndOfFile); fattr->cf_bytes = le64_to_cpu(info->AllocationSize); fattr->cf_createtime = le64_to_cpu(info->CreationTime); fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); cifs_fill_common_info(fattr, cifs_sb); } static void cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, struct cifs_sb_info *cifs_sb) { int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; memset(fattr, 0, sizeof(*fattr)); fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, info->LastAccessTime, offset); fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, info->LastWriteTime, offset); fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, info->LastWriteTime, offset); fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); fattr->cf_bytes = le32_to_cpu(info->AllocationSize); fattr->cf_eof = le32_to_cpu(info->DataSize); cifs_fill_common_info(fattr, cifs_sb); } /* BB eventually need to add the following helper function to resolve NT_STATUS_STOPPED_ON_SYMLINK return code when we try to do FindFirst on (NTFS) directory symlinks */ /* int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, unsigned int xid) { __u16 fid; int len; int oplock = 0; int rc; struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); char *tmpbuffer; rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, OPEN_REPARSE_POINT, &fid, &oplock, NULL, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); if (!rc) { tmpbuffer = kmalloc(maxpath); rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, tmpbuffer, maxpath -1, fid, cifs_sb->local_nls); if (CIFSSMBClose(xid, ptcon, fid)) { cFYI(1, "Error closing temporary reparsepoint open"); } } } */ static int initiate_cifs_search(const unsigned int xid, struct file *file) { __u16 search_flags; int rc = 0; char *full_path = NULL; struct cifsFileInfo *cifsFile; struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); struct tcon_link *tlink = NULL; struct cifs_tcon *tcon; struct TCP_Server_Info *server; if (file->private_data == NULL) { tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); if (cifsFile == NULL) { rc = -ENOMEM; goto error_exit; } file->private_data = cifsFile; cifsFile->tlink = cifs_get_tlink(tlink); tcon = tlink_tcon(tlink); } else { cifsFile = file->private_data; tcon = tlink_tcon(cifsFile->tlink); } server = tcon->ses->server; if (!server->ops->query_dir_first) { rc = -ENOSYS; goto error_exit; } cifsFile->invalidHandle = true; cifsFile->srch_inf.endOfSearch = false; full_path = build_path_from_dentry(file->f_path.dentry); if (full_path == NULL) { rc = -ENOMEM; goto error_exit; } cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos); ffirst_retry: /* test for Unix extensions */ /* but now check for them on the share/mount not on the SMB session */ /* if (cap_unix(tcon->ses) { */ if (tcon->unix_ext) cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; else if ((tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find) == 0) { cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; } else /* not srvinos - BB fixme add check for backlevel? */ { cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; } search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; if (backup_cred(cifs_sb)) search_flags |= CIFS_SEARCH_BACKUP_SEARCH; rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb, &cifsFile->fid, search_flags, &cifsFile->srch_inf); if (rc == 0) cifsFile->invalidHandle = false; /* BB add following call to handle readdir on new NTFS symlink errors else if STATUS_STOPPED_ON_SYMLINK call get_symlink_reparse_path and retry with new path */ else if ((rc == -EOPNOTSUPP) && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; goto ffirst_retry; } error_exit: kfree(full_path); cifs_put_tlink(tlink); return rc; } /* return length of unicode string in bytes */ static int cifs_unicode_bytelen(const char *str) { int len; const __le16 *ustr = (const __le16 *)str; for (len = 0; len <= PATH_MAX; len++) { if (ustr[len] == 0) return len << 1; } cFYI(1, "Unicode string longer than PATH_MAX found"); return len << 1; } static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) { char *new_entry; FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; if (level == SMB_FIND_FILE_INFO_STANDARD) { FIND_FILE_STANDARD_INFO *pfData; pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + pfData->FileNameLength; } else new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset); cFYI(1, "new entry %p old entry %p", new_entry, old_entry); /* validate that new_entry is not past end of SMB */ if (new_entry >= end_of_smb) { cERROR(1, "search entry %p began after end of SMB %p old entry %p", new_entry, end_of_smb, old_entry); return NULL; } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) || ((level != SMB_FIND_FILE_INFO_STANDARD) && (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { cERROR(1, "search entry %p extends after end of SMB %p", new_entry, end_of_smb); return NULL; } else return new_entry; } struct cifs_dirent { const char *name; size_t namelen; u32 resume_key; u64 ino; }; static void cifs_fill_dirent_unix(struct cifs_dirent *de, const FILE_UNIX_INFO *info, bool is_unicode) { de->name = &info->FileName[0]; if (is_unicode) de->namelen = cifs_unicode_bytelen(de->name); else de->namelen = strnlen(de->name, PATH_MAX); de->resume_key = info->ResumeKey; de->ino = le64_to_cpu(info->basic.UniqueId); } static void cifs_fill_dirent_dir(struct cifs_dirent *de, const FILE_DIRECTORY_INFO *info) { de->name = &info->FileName[0]; de->namelen = le32_to_cpu(info->FileNameLength); de->resume_key = info->FileIndex; } static void cifs_fill_dirent_full(struct cifs_dirent *de, const FILE_FULL_DIRECTORY_INFO *info) { de->name = &info->FileName[0]; de->namelen = le32_to_cpu(info->FileNameLength); de->resume_key = info->FileIndex; } static void cifs_fill_dirent_search(struct cifs_dirent *de, const SEARCH_ID_FULL_DIR_INFO *info) { de->name = &info->FileName[0]; de->namelen = le32_to_cpu(info->FileNameLength); de->resume_key = info->FileIndex; de->ino = le64_to_cpu(info->UniqueId); } static void cifs_fill_dirent_both(struct cifs_dirent *de, const FILE_BOTH_DIRECTORY_INFO *info) { de->name = &info->FileName[0]; de->namelen = le32_to_cpu(info->FileNameLength); de->resume_key = info->FileIndex; } static void cifs_fill_dirent_std(struct cifs_dirent *de, const FIND_FILE_STANDARD_INFO *info) { de->name = &info->FileName[0]; /* one byte length, no endianess conversion */ de->namelen = info->FileNameLength; de->resume_key = info->ResumeKey; } static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, u16 level, bool is_unicode) { memset(de, 0, sizeof(*de)); switch (level) { case SMB_FIND_FILE_UNIX: cifs_fill_dirent_unix(de, info, is_unicode); break; case SMB_FIND_FILE_DIRECTORY_INFO: cifs_fill_dirent_dir(de, info); break; case SMB_FIND_FILE_FULL_DIRECTORY_INFO: cifs_fill_dirent_full(de, info); break; case SMB_FIND_FILE_ID_FULL_DIR_INFO: cifs_fill_dirent_search(de, info); break; case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: cifs_fill_dirent_both(de, info); break; case SMB_FIND_FILE_INFO_STANDARD: cifs_fill_dirent_std(de, info); break; default: cFYI(1, "Unknown findfirst level %d", level); return -EINVAL; } return 0; } #define UNICODE_DOT cpu_to_le16(0x2e) /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) { int rc = 0; if (!de->name) return 0; if (is_unicode) { __le16 *ufilename = (__le16 *)de->name; if (de->namelen == 2) { /* check for . */ if (ufilename[0] == UNICODE_DOT) rc = 1; } else if (de->namelen == 4) { /* check for .. */ if (ufilename[0] == UNICODE_DOT && ufilename[1] == UNICODE_DOT) rc = 2; } } else /* ASCII */ { if (de->namelen == 1) { if (de->name[0] == '.') rc = 1; } else if (de->namelen == 2) { if (de->name[0] == '.' && de->name[1] == '.') rc = 2; } } return rc; } /* Check if directory that we are searching has changed so we can decide whether we can use the cached search results from the previous search */ static int is_dir_changed(struct file *file) { struct inode *inode = file_inode(file); struct cifsInodeInfo *cifsInfo = CIFS_I(inode); if (cifsInfo->time == 0) return 1; /* directory was changed, perhaps due to unlink */ else return 0; } static int cifs_save_resume_key(const char *current_entry, struct cifsFileInfo *file_info) { struct cifs_dirent de; int rc; rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, file_info->srch_inf.unicode); if (!rc) { file_info->srch_inf.presume_name = de.name; file_info->srch_inf.resume_name_len = de.namelen; file_info->srch_inf.resume_key = de.resume_key; } return rc; } /* * Find the corresponding entry in the search. Note that the SMB server returns * search entries for . and .. which complicates logic here if we choose to * parse for them and we do not assume that they are located in the findfirst * return buffer. We start counting in the buffer with entry 2 and increment for * every entry (do not increment for . or .. entry). */ static int find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, struct file *file, char **current_entry, int *num_to_ret) { __u16 search_flags; int rc = 0; int pos_in_buf = 0; loff_t first_entry_in_buffer; loff_t index_to_find = file->f_pos; struct cifsFileInfo *cfile = file->private_data; struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); struct TCP_Server_Info *server = tcon->ses->server; /* check if index in the buffer */ if (!server->ops->query_dir_first || !server->ops->query_dir_next) return -ENOSYS; if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL)) return -ENOENT; *current_entry = NULL; first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - cfile->srch_inf.entries_in_buffer; /* * If first entry in buf is zero then is first buffer * in search response data which means it is likely . and .. * will be in this buffer, although some servers do not return * . and .. for the root of a drive and for those we need * to start two entries earlier. */ dump_cifs_file_struct(file, "In fce "); if (((index_to_find < cfile->srch_inf.index_of_last_entry) && is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) { /* close and restart search */ cFYI(1, "search backing up - close and restart search"); spin_lock(&cifs_file_list_lock); if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { cfile->invalidHandle = true; spin_unlock(&cifs_file_list_lock); if (server->ops->close) server->ops->close(xid, tcon, &cfile->fid); } else spin_unlock(&cifs_file_list_lock); if (cfile->srch_inf.ntwrk_buf_start) { cFYI(1, "freeing SMB ff cache buf on search rewind"); if (cfile->srch_inf.smallBuf) cifs_small_buf_release(cfile->srch_inf. ntwrk_buf_start); else cifs_buf_release(cfile->srch_inf. ntwrk_buf_start); cfile->srch_inf.ntwrk_buf_start = NULL; } rc = initiate_cifs_search(xid, file); if (rc) { cFYI(1, "error %d reinitiating a search on rewind", rc); return rc; } /* FindFirst/Next set last_entry to NULL on malformed reply */ if (cfile->srch_inf.last_entry) cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); } search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; if (backup_cred(cifs_sb)) search_flags |= CIFS_SEARCH_BACKUP_SEARCH; while ((index_to_find >= cfile->srch_inf.index_of_last_entry) && (rc == 0) && !cfile->srch_inf.endOfSearch) { cFYI(1, "calling findnext2"); rc = server->ops->query_dir_next(xid, tcon, &cfile->fid, search_flags, &cfile->srch_inf); /* FindFirst/Next set last_entry to NULL on malformed reply */ if (cfile->srch_inf.last_entry) cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); if (rc) return -ENOENT; } if (index_to_find < cfile->srch_inf.index_of_last_entry) { /* we found the buffer that contains the entry */ /* scan and find it */ int i; char *cur_ent; char *end_of_smb = cfile->srch_inf.ntwrk_buf_start + server->ops->calc_smb_size( cfile->srch_inf.ntwrk_buf_start); cur_ent = cfile->srch_inf.srch_entries_start; first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - cfile->srch_inf.entries_in_buffer; pos_in_buf = index_to_find - first_entry_in_buffer; cFYI(1, "found entry - pos_in_buf %d", pos_in_buf); for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) { /* go entry by entry figuring out which is first */ cur_ent = nxt_dir_entry(cur_ent, end_of_smb, cfile->srch_inf.info_level); } if ((cur_ent == NULL) && (i < pos_in_buf)) { /* BB fixme - check if we should flag this error */ cERROR(1, "reached end of buf searching for pos in buf" " %d index to find %lld rc %d", pos_in_buf, index_to_find, rc); } rc = 0; *current_entry = cur_ent; } else { cFYI(1, "index not in buffer - could not findnext into it"); return 0; } if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) { cFYI(1, "can not return entries pos_in_buf beyond last"); *num_to_ret = 0; } else *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf; return rc; } static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir, void *dirent, char *scratch_buf, unsigned int max_len) { struct cifsFileInfo *file_info = file->private_data; struct super_block *sb = file->f_path.dentry->d_sb; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); struct cifs_dirent de = { NULL, }; struct cifs_fattr fattr; struct qstr name; int rc = 0; ino_t ino; rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, file_info->srch_inf.unicode); if (rc) return rc; if (de.namelen > max_len) { cERROR(1, "bad search response length %zd past smb end", de.namelen); return -EINVAL; } /* skip . and .. since we added them first */ if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) return 0; if (file_info->srch_inf.unicode) { struct nls_table *nlt = cifs_sb->local_nls; name.name = scratch_buf; name.len = cifs_from_utf16((char *)name.name, (__le16 *)de.name, UNICODE_NAME_MAX, min_t(size_t, de.namelen, (size_t)max_len), nlt, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); name.len -= nls_nullsize(nlt); } else { name.name = de.name; name.len = de.namelen; } switch (file_info->srch_inf.info_level) { case SMB_FIND_FILE_UNIX: cifs_unix_basic_to_fattr(&fattr, &((FILE_UNIX_INFO *)find_entry)->basic, cifs_sb); break; case SMB_FIND_FILE_INFO_STANDARD: cifs_std_info_to_fattr(&fattr, (FIND_FILE_STANDARD_INFO *)find_entry, cifs_sb); break; default: cifs_dir_info_to_fattr(&fattr, (FILE_DIRECTORY_INFO *)find_entry, cifs_sb); break; } if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { fattr.cf_uniqueid = de.ino; } else { fattr.cf_uniqueid = iunique(sb, ROOT_I); cifs_autodisable_serverino(cifs_sb); } if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && CIFSCouldBeMFSymlink(&fattr)) /* * trying to get the type and mode can be slow, * so just call those regular files for now, and mark * for reval */ fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; cifs_prime_dcache(file->f_dentry, &name, &fattr); ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); rc = filldir(dirent, name.name, name.len, file->f_pos, ino, fattr.cf_dtype); return rc; } int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) { int rc = 0; unsigned int xid; int i; struct cifs_tcon *tcon; struct cifsFileInfo *cifsFile = NULL; char *current_entry; int num_to_fill = 0; char *tmp_buf = NULL; char *end_of_smb; unsigned int max_len; xid = get_xid(); /* * Ensure FindFirst doesn't fail before doing filldir() for '.' and * '..'. Otherwise we won't be able to notify VFS in case of failure. */ if (file->private_data == NULL) { rc = initiate_cifs_search(xid, file); cFYI(1, "initiate cifs search rc %d", rc); if (rc) goto rddir2_exit; } switch ((int) file->f_pos) { case 0: if (filldir(direntry, ".", 1, file->f_pos, file_inode(file)->i_ino, DT_DIR) < 0) { cERROR(1, "Filldir for current dir failed"); rc = -ENOMEM; break; } file->f_pos++; case 1: if (filldir(direntry, "..", 2, file->f_pos, parent_ino(file->f_path.dentry), DT_DIR) < 0) { cERROR(1, "Filldir for parent dir failed"); rc = -ENOMEM; break; } file->f_pos++; default: /* 1) If search is active, is in current search buffer? if it before then restart search if after then keep searching till find it */ if (file->private_data == NULL) { rc = -EINVAL; free_xid(xid); return rc; } cifsFile = file->private_data; if (cifsFile->srch_inf.endOfSearch) { if (cifsFile->srch_inf.emptyDir) { cFYI(1, "End of search, empty dir"); rc = 0; break; } } /* else { cifsFile->invalidHandle = true; tcon->ses->server->close(xid, tcon, &cifsFile->fid); } */ tcon = tlink_tcon(cifsFile->tlink); rc = find_cifs_entry(xid, tcon, file, ¤t_entry, &num_to_fill); if (rc) { cFYI(1, "fce error %d", rc); goto rddir2_exit; } else if (current_entry != NULL) { cFYI(1, "entry %lld found", file->f_pos); } else { cFYI(1, "could not find entry"); goto rddir2_exit; } cFYI(1, "loop through %d times filling dir for net buf %p", num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); max_len = tcon->ses->server->ops->calc_smb_size( cifsFile->srch_inf.ntwrk_buf_start); end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); if (tmp_buf == NULL) { rc = -ENOMEM; break; } for (i = 0; (i < num_to_fill) && (rc == 0); i++) { if (current_entry == NULL) { /* evaluate whether this case is an error */ cERROR(1, "past SMB end, num to fill %d i %d", num_to_fill, i); break; } /* * if buggy server returns . and .. late do we want to * check for that here? */ rc = cifs_filldir(current_entry, file, filldir, direntry, tmp_buf, max_len); if (rc == -EOVERFLOW) { rc = 0; break; } file->f_pos++; if (file->f_pos == cifsFile->srch_inf.index_of_last_entry) { cFYI(1, "last entry in buf at pos %lld %s", file->f_pos, tmp_buf); cifs_save_resume_key(current_entry, cifsFile); break; } else current_entry = nxt_dir_entry(current_entry, end_of_smb, cifsFile->srch_inf.info_level); } kfree(tmp_buf); break; } /* end switch */ rddir2_exit: free_xid(xid); return rc; }