/* * fs/cifs/readdir.c * * Directory search handling * * Copyright (C) International Business Machines Corp., 2004, 2008 * 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 <linux/fs.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/stat.h> #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 */ /* * 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 struct dentry * cifs_readdir_lookup(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; cFYI(1, "For %s", name->name); if (parent->d_op && parent->d_op->d_hash) parent->d_op->d_hash(parent, name); else name->hash = full_name_hash(name->name, name->len); dentry = d_lookup(parent, name); if (dentry) { /* FIXME: check for inode number changes? */ if (dentry->d_inode != NULL) return dentry; d_drop(dentry); dput(dentry); } dentry = d_alloc(parent, name); if (dentry == NULL) return NULL; inode = cifs_iget(sb, fattr); if (!inode) { dput(dentry); return NULL; } if (CIFS_SB(sb)->tcon->nocase) dentry->d_op = &cifs_ci_dentry_ops; else dentry->d_op = &cifs_dentry_ops; alias = d_materialise_unique(dentry, inode); if (alias != NULL) { dput(dentry); if (IS_ERR(alias)) return NULL; dentry = alias; } return 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; 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; } } } static 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_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->tcon->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, int xid) { __u16 fid; int len; int oplock = 0; int rc; struct cifsTconInfo *ptcon = cifs_sb->tcon; 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 int xid, struct file *file) { int rc = 0; char *full_path; struct cifsFileInfo *cifsFile; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; if (file->private_data == NULL) { file->private_data = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); } if (file->private_data == NULL) return -ENOMEM; cifsFile = file->private_data; cifsFile->invalidHandle = true; cifsFile->srch_inf.endOfSearch = false; cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); if (cifs_sb == NULL) return -EINVAL; pTcon = cifs_sb->tcon; if (pTcon == NULL) return -EINVAL; full_path = build_path_from_dentry(file->f_path.dentry); if (full_path == NULL) return -ENOMEM; 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 (pTcon->ses->capabilities & CAP_UNIX) { */ if (pTcon->unix_ext) cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; else if ((pTcon->ses->capabilities & (CAP_NT_SMBS | 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; } rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls, &cifsFile->netfid, &cifsFile->srch_inf, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb)); 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; } kfree(full_path); return rc; } /* return length of unicode string in bytes */ static int cifs_unicode_bytelen(char *str) { int len; __le16 *ustr = (__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; } #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(char *current_entry, struct cifsFileInfo *cfile) { int rc = 0; char *filename = NULL; int len = 0; if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) { FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry; filename = &pFindData->FileName[0]; if (cfile->srch_inf.unicode) { len = cifs_unicode_bytelen(filename); } else { /* BB should we make this strnlen of PATH_MAX? */ len = strnlen(filename, 5); } } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) { FILE_DIRECTORY_INFO *pFindData = (FILE_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) { FILE_FULL_DIRECTORY_INFO *pFindData = (FILE_FULL_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO) { SEARCH_ID_FULL_DIR_INFO *pFindData = (SEARCH_ID_FULL_DIR_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) { FILE_BOTH_DIRECTORY_INFO *pFindData = (FILE_BOTH_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) { FIND_FILE_STANDARD_INFO *pFindData = (FIND_FILE_STANDARD_INFO *)current_entry; filename = &pFindData->FileName[0]; len = pFindData->FileNameLength; } else { cFYI(1, "Unknown findfirst level %d", cfile->srch_inf.info_level); } if (filename) { if (cfile->srch_inf.unicode) { __le16 *ufilename = (__le16 *)filename; if (len == 2) { /* check for . */ if (ufilename[0] == UNICODE_DOT) rc = 1; } else if (len == 4) { /* check for .. */ if ((ufilename[0] == UNICODE_DOT) && (ufilename[1] == UNICODE_DOT)) rc = 2; } } else /* ASCII */ { if (len == 1) { if (filename[0] == '.') rc = 1; } else if (len == 2) { if ((filename[0] == '.') && (filename[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->f_path.dentry->d_inode; 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 *cifsFile) { int rc = 0; unsigned int len = 0; __u16 level; char *filename; if ((cifsFile == NULL) || (current_entry == NULL)) return -EINVAL; level = cifsFile->srch_inf.info_level; if (level == SMB_FIND_FILE_UNIX) { FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry; filename = &pFindData->FileName[0]; if (cifsFile->srch_inf.unicode) { len = cifs_unicode_bytelen(filename); } else { /* BB should we make this strnlen of PATH_MAX? */ len = strnlen(filename, PATH_MAX); } cifsFile->srch_inf.resume_key = pFindData->ResumeKey; } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) { FILE_DIRECTORY_INFO *pFindData = (FILE_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); cifsFile->srch_inf.resume_key = pFindData->FileIndex; } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) { FILE_FULL_DIRECTORY_INFO *pFindData = (FILE_FULL_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); cifsFile->srch_inf.resume_key = pFindData->FileIndex; } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) { SEARCH_ID_FULL_DIR_INFO *pFindData = (SEARCH_ID_FULL_DIR_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); cifsFile->srch_inf.resume_key = pFindData->FileIndex; } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) { FILE_BOTH_DIRECTORY_INFO *pFindData = (FILE_BOTH_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); cifsFile->srch_inf.resume_key = pFindData->FileIndex; } else if (level == SMB_FIND_FILE_INFO_STANDARD) { FIND_FILE_STANDARD_INFO *pFindData = (FIND_FILE_STANDARD_INFO *)current_entry; filename = &pFindData->FileName[0]; /* one byte length, no name conversion */ len = (unsigned int)pFindData->FileNameLength; cifsFile->srch_inf.resume_key = pFindData->ResumeKey; } else { cFYI(1, "Unknown findfirst level %d", level); return -EINVAL; } cifsFile->srch_inf.resume_name_len = len; cifsFile->srch_inf.presume_name = filename; 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 int xid, struct cifsTconInfo *pTcon, struct file *file, char **ppCurrentEntry, int *num_to_ret) { int rc = 0; int pos_in_buf = 0; loff_t first_entry_in_buffer; loff_t index_to_find = file->f_pos; struct cifsFileInfo *cifsFile = file->private_data; /* check if index in the buffer */ if ((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL)) return -ENOENT; *ppCurrentEntry = NULL; first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry - cifsFile->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 < cifsFile->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"); write_lock(&GlobalSMBSeslock); if (!cifsFile->srch_inf.endOfSearch && !cifsFile->invalidHandle) { cifsFile->invalidHandle = true; write_unlock(&GlobalSMBSeslock); CIFSFindClose(xid, pTcon, cifsFile->netfid); } else write_unlock(&GlobalSMBSeslock); if (cifsFile->srch_inf.ntwrk_buf_start) { cFYI(1, "freeing SMB ff cache buf on search rewind"); if (cifsFile->srch_inf.smallBuf) cifs_small_buf_release(cifsFile->srch_inf. ntwrk_buf_start); else cifs_buf_release(cifsFile->srch_inf. ntwrk_buf_start); cifsFile->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; } cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile); } while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) && (rc == 0) && !cifsFile->srch_inf.endOfSearch) { cFYI(1, "calling findnext2"); rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, &cifsFile->srch_inf); cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile); if (rc) return -ENOENT; } if (index_to_find < cifsFile->srch_inf.index_of_last_entry) { /* we found the buffer that contains the entry */ /* scan and find it */ int i; char *current_entry; char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + smbCalcSize((struct smb_hdr *) cifsFile->srch_inf.ntwrk_buf_start); current_entry = cifsFile->srch_inf.srch_entries_start; first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry - cifsFile->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)) && (current_entry != NULL); i++) { /* go entry by entry figuring out which is first */ current_entry = nxt_dir_entry(current_entry, end_of_smb, cifsFile->srch_inf.info_level); } if ((current_entry == 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; *ppCurrentEntry = current_entry; } else { cFYI(1, "index not in buffer - could not findnext into it"); return 0; } if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) { cFYI(1, "can not return entries pos_in_buf beyond last"); *num_to_ret = 0; } else *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf; return rc; } /* inode num, inode type and filename returned */ static int cifs_get_name_from_search_buf(struct qstr *pqst, char *current_entry, __u16 level, unsigned int unicode, struct cifs_sb_info *cifs_sb, unsigned int max_len, __u64 *pinum) { int rc = 0; unsigned int len = 0; char *filename; struct nls_table *nlt = cifs_sb->local_nls; *pinum = 0; if (level == SMB_FIND_FILE_UNIX) { FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry; filename = &pFindData->FileName[0]; if (unicode) { len = cifs_unicode_bytelen(filename); } else { /* BB should we make this strnlen of PATH_MAX? */ len = strnlen(filename, PATH_MAX); } *pinum = le64_to_cpu(pFindData->basic.UniqueId); } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) { FILE_DIRECTORY_INFO *pFindData = (FILE_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) { FILE_FULL_DIRECTORY_INFO *pFindData = (FILE_FULL_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) { SEARCH_ID_FULL_DIR_INFO *pFindData = (SEARCH_ID_FULL_DIR_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); *pinum = le64_to_cpu(pFindData->UniqueId); } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) { FILE_BOTH_DIRECTORY_INFO *pFindData = (FILE_BOTH_DIRECTORY_INFO *)current_entry; filename = &pFindData->FileName[0]; len = le32_to_cpu(pFindData->FileNameLength); } else if (level == SMB_FIND_FILE_INFO_STANDARD) { FIND_FILE_STANDARD_INFO *pFindData = (FIND_FILE_STANDARD_INFO *)current_entry; filename = &pFindData->FileName[0]; /* one byte length, no name conversion */ len = (unsigned int)pFindData->FileNameLength; } else { cFYI(1, "Unknown findfirst level %d", level); return -EINVAL; } if (len > max_len) { cERROR(1, "bad search response length %d past smb end", len); return -EINVAL; } if (unicode) { pqst->len = cifs_from_ucs2((char *) pqst->name, (__le16 *) filename, UNICODE_NAME_MAX, min(len, max_len), nlt, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); pqst->len -= nls_nullsize(nlt); } else { pqst->name = filename; pqst->len = len; } return rc; } static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir, void *direntry, char *scratch_buf, unsigned int max_len) { int rc = 0; struct qstr qstring; struct cifsFileInfo *pCifsF; u64 inum; ino_t ino; struct super_block *sb; struct cifs_sb_info *cifs_sb; struct dentry *tmp_dentry; struct cifs_fattr fattr; /* get filename and len into qstring */ /* get dentry */ /* decide whether to create and populate ionde */ if ((direntry == NULL) || (file == NULL)) return -EINVAL; pCifsF = file->private_data; if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL)) return -ENOENT; rc = cifs_entry_is_dot(pfindEntry, pCifsF); /* skip . and .. since we added them first */ if (rc != 0) return 0; sb = file->f_path.dentry->d_sb; cifs_sb = CIFS_SB(sb); qstring.name = scratch_buf; rc = cifs_get_name_from_search_buf(&qstring, pfindEntry, pCifsF->srch_inf.info_level, pCifsF->srch_inf.unicode, cifs_sb, max_len, &inum /* returned */); if (rc) return rc; if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) cifs_unix_basic_to_fattr(&fattr, &((FILE_UNIX_INFO *) pfindEntry)->basic, cifs_sb); else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) cifs_std_info_to_fattr(&fattr, (FIND_FILE_STANDARD_INFO *) pfindEntry, cifs_sb); else cifs_dir_info_to_fattr(&fattr, (FILE_DIRECTORY_INFO *) pfindEntry, cifs_sb); if (inum && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { fattr.cf_uniqueid = inum; } else { fattr.cf_uniqueid = iunique(sb, ROOT_I); cifs_autodisable_serverino(cifs_sb); } ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr); rc = filldir(direntry, qstring.name, qstring.len, file->f_pos, ino, fattr.cf_dtype); /* * we can not return filldir errors to the caller since they are * "normal" when the stat blocksize is too small - we return remapped * error instead * * FIXME: This looks bogus. filldir returns -EOVERFLOW in the above * case already. Why should we be clobbering other errors from it? */ if (rc) { cFYI(1, "filldir rc = %d", rc); rc = -EOVERFLOW; } dput(tmp_dentry); return rc; } int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) { int rc = 0; int xid, i; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; 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 = GetXid(); cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); pTcon = cifs_sb->tcon; if (pTcon == NULL) return -EINVAL; switch ((int) file->f_pos) { case 0: if (filldir(direntry, ".", 1, file->f_pos, file->f_path.dentry->d_inode->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, file->f_path.dentry->d_parent->d_inode->i_ino, 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 = initiate_cifs_search(xid, file); cFYI(1, "initiate cifs search rc %d", rc); if (rc) { FreeXid(xid); return rc; } } if (file->private_data == NULL) { rc = -EINVAL; FreeXid(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; CIFSFindClose(xid, pTcon, cifsFile->netfid); } */ rc = find_cifs_entry(xid, pTcon, 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 = smbCalcSize((struct smb_hdr *) 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: FreeXid(xid); return rc; }