| /* |
| * 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_master_tcon(CIFS_SB(sb))->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_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, |
| int xid) |
| { |
| __u16 fid; |
| int len; |
| int oplock = 0; |
| int rc; |
| struct cifsTconInfo *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 int xid, struct file *file) |
| { |
| 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; |
| struct cifsTconInfo *pTcon; |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| pTcon = tlink_tcon(tlink); |
| |
| if (file->private_data == NULL) |
| file->private_data = |
| kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); |
| if (file->private_data == NULL) { |
| rc = -ENOMEM; |
| goto error_exit; |
| } |
| |
| cifsFile = file->private_data; |
| cifsFile->invalidHandle = true; |
| cifsFile->srch_inf.endOfSearch = false; |
| cifsFile->tlink = cifs_get_tlink(tlink); |
| |
| 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 (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; |
| } |
| error_exit: |
| kfree(full_path); |
| cifs_put_tlink(tlink); |
| 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); |
| } |
| |
| 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; |
| |
| 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); |
| |
| 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); |
| } */ |
| |
| pTcon = tlink_tcon(cifsFile->tlink); |
| 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; |
| } |