/* * 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/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" #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 */ /* Returns one if new inode created (which therefore needs to be hashed) */ /* Might check in the future if inode number changed so we can rehash inode */ static int construct_dentry(struct qstr *qstring, struct file *file, struct inode **ptmp_inode, struct dentry **pnew_dentry) { struct dentry *tmp_dentry; struct cifs_sb_info *cifs_sb; struct cifsTconInfo *pTcon; int rc = 0; cFYI(1, ("For %s", qstring->name)); cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); pTcon = cifs_sb->tcon; qstring->hash = full_name_hash(qstring->name, qstring->len); tmp_dentry = d_lookup(file->f_path.dentry, qstring); if (tmp_dentry) { cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode)); *ptmp_inode = tmp_dentry->d_inode; /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/ if (*ptmp_inode == NULL) { *ptmp_inode = new_inode(file->f_path.dentry->d_sb); if (*ptmp_inode == NULL) return rc; rc = 1; } if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME) (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME; } else { tmp_dentry = d_alloc(file->f_path.dentry, qstring); if (tmp_dentry == NULL) { cERROR(1, ("Failed allocating dentry")); *ptmp_inode = NULL; return rc; } *ptmp_inode = new_inode(file->f_path.dentry->d_sb); if (pTcon->nocase) tmp_dentry->d_op = &cifs_ci_dentry_ops; else tmp_dentry->d_op = &cifs_dentry_ops; if (*ptmp_inode == NULL) return rc; if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME) (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME; rc = 2; } tmp_dentry->d_time = jiffies; *pnew_dentry = tmp_dentry; return rc; } static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode) { if ((tcon) && (tcon->ses) && (tcon->ses->server)) { inode->i_ctime.tv_sec += tcon->ses->server->timeAdj; inode->i_mtime.tv_sec += tcon->ses->server->timeAdj; inode->i_atime.tv_sec += tcon->ses->server->timeAdj; } return; } static void fill_in_inode(struct inode *tmp_inode, int new_buf_type, char *buf, unsigned int *pobject_type, int isNewInode) { loff_t local_size; struct timespec local_mtime; struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode); struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb); __u32 attr; __u64 allocation_size; __u64 end_of_file; umode_t default_mode; /* save mtime and size */ local_mtime = tmp_inode->i_mtime; local_size = tmp_inode->i_size; if (new_buf_type) { FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf; attr = le32_to_cpu(pfindData->ExtFileAttributes); allocation_size = le64_to_cpu(pfindData->AllocationSize); end_of_file = le64_to_cpu(pfindData->EndOfFile); tmp_inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime)); tmp_inode->i_mtime = cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime)); tmp_inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime)); } else { /* legacy, OS2 and DOS style */ /* struct timespec ts;*/ FIND_FILE_STANDARD_INFO *pfindData = (FIND_FILE_STANDARD_INFO *)buf; tmp_inode->i_mtime = cnvrtDosUnixTm( le16_to_cpu(pfindData->LastWriteDate), le16_to_cpu(pfindData->LastWriteTime)); tmp_inode->i_atime = cnvrtDosUnixTm( le16_to_cpu(pfindData->LastAccessDate), le16_to_cpu(pfindData->LastAccessTime)); tmp_inode->i_ctime = cnvrtDosUnixTm( le16_to_cpu(pfindData->LastWriteDate), le16_to_cpu(pfindData->LastWriteTime)); AdjustForTZ(cifs_sb->tcon, tmp_inode); attr = le16_to_cpu(pfindData->Attributes); allocation_size = le32_to_cpu(pfindData->AllocationSize); end_of_file = le32_to_cpu(pfindData->DataSize); } /* Linux can not store file creation time unfortunately so ignore it */ cifsInfo->cifsAttrs = attr; #ifdef CONFIG_CIFS_EXPERIMENTAL if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) { /* get more accurate mode via ACL - so force inode refresh */ cifsInfo->time = 0; } else #endif /* CONFIG_CIFS_EXPERIMENTAL */ cifsInfo->time = jiffies; /* treat dos attribute of read-only as read-only mode bit e.g. 555? */ /* 2767 perms - indicate mandatory locking */ /* BB fill in uid and gid here? with help from winbind? or retrieve from NTFS stream extended attribute */ if (atomic_read(&cifsInfo->inUse) == 0) { tmp_inode->i_uid = cifs_sb->mnt_uid; tmp_inode->i_gid = cifs_sb->mnt_gid; } if (attr & ATTR_DIRECTORY) default_mode = cifs_sb->mnt_dir_mode; else default_mode = cifs_sb->mnt_file_mode; /* set initial permissions */ if ((atomic_read(&cifsInfo->inUse) == 0) || (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0) tmp_inode->i_mode = default_mode; else { /* just reenable write bits if !ATTR_READONLY */ if ((tmp_inode->i_mode & S_IWUGO) == 0 && (attr & ATTR_READONLY) == 0) tmp_inode->i_mode |= (S_IWUGO & default_mode); tmp_inode->i_mode &= ~S_IFMT; } /* clear write bits if ATTR_READONLY is set */ if (attr & ATTR_READONLY) tmp_inode->i_mode &= ~S_IWUGO; /* set inode type */ if ((attr & ATTR_SYSTEM) && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) { if (end_of_file == 0) { tmp_inode->i_mode |= S_IFIFO; *pobject_type = DT_FIFO; } else { /* * trying to get the type can be slow, so just call * this a regular file for now, and mark for reval */ tmp_inode->i_mode |= S_IFREG; *pobject_type = DT_REG; cifsInfo->time = 0; } } else { if (attr & ATTR_DIRECTORY) { tmp_inode->i_mode |= S_IFDIR; *pobject_type = DT_DIR; } else { tmp_inode->i_mode |= S_IFREG; *pobject_type = DT_REG; } } /* can not fill in nlink here as in qpathinfo version and Unx search */ if (atomic_read(&cifsInfo->inUse) == 0) atomic_set(&cifsInfo->inUse, 1); spin_lock(&tmp_inode->i_lock); if (is_size_safe_to_change(cifsInfo, end_of_file)) { /* can not safely change the file size here if the client is writing to it due to potential races */ i_size_write(tmp_inode, end_of_file); /* 512 bytes (2**9) is the fake blocksize that must be used */ /* for this calculation, even though the reported blocksize is larger */ tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9; } spin_unlock(&tmp_inode->i_lock); if (allocation_size < end_of_file) cFYI(1, ("May be sparse file, allocation less than file size")); cFYI(1, ("File Size %ld and blocks %llu", (unsigned long)tmp_inode->i_size, (unsigned long long)tmp_inode->i_blocks)); if (S_ISREG(tmp_inode->i_mode)) { cFYI(1, ("File inode")); tmp_inode->i_op = &cifs_file_inode_ops; if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) tmp_inode->i_fop = &cifs_file_direct_nobrl_ops; else tmp_inode->i_fop = &cifs_file_direct_ops; } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) tmp_inode->i_fop = &cifs_file_nobrl_ops; else tmp_inode->i_fop = &cifs_file_ops; if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server->maxBuf < PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)) tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf; else tmp_inode->i_data.a_ops = &cifs_addr_ops; if (isNewInode) return; /* No sense invalidating pages for new inode since have not started caching readahead file data yet */ if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) && (local_size == tmp_inode->i_size)) { cFYI(1, ("inode exists but unchanged")); } else { /* file may have changed on server */ cFYI(1, ("invalidate inode, readdir detected change")); invalidate_remote_inode(tmp_inode); } } else if (S_ISDIR(tmp_inode->i_mode)) { cFYI(1, ("Directory inode")); tmp_inode->i_op = &cifs_dir_inode_ops; tmp_inode->i_fop = &cifs_dir_ops; } else if (S_ISLNK(tmp_inode->i_mode)) { cFYI(1, ("Symbolic Link inode")); tmp_inode->i_op = &cifs_symlink_inode_ops; } else { cFYI(1, ("Init special inode")); init_special_inode(tmp_inode, tmp_inode->i_mode, tmp_inode->i_rdev); } } static void unix_fill_in_inode(struct inode *tmp_inode, FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode) { loff_t local_size; struct timespec local_mtime; struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode); struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb); __u32 type = le32_to_cpu(pfindData->Type); __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes); __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile); cifsInfo->time = jiffies; atomic_inc(&cifsInfo->inUse); /* save mtime and size */ local_mtime = tmp_inode->i_mtime; local_size = tmp_inode->i_size; tmp_inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime)); tmp_inode->i_mtime = cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime)); tmp_inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange)); tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions); /* since we set the inode type below we need to mask off type to avoid strange results if bits above were corrupt */ tmp_inode->i_mode &= ~S_IFMT; if (type == UNIX_FILE) { *pobject_type = DT_REG; tmp_inode->i_mode |= S_IFREG; } else if (type == UNIX_SYMLINK) { *pobject_type = DT_LNK; tmp_inode->i_mode |= S_IFLNK; } else if (type == UNIX_DIR) { *pobject_type = DT_DIR; tmp_inode->i_mode |= S_IFDIR; } else if (type == UNIX_CHARDEV) { *pobject_type = DT_CHR; tmp_inode->i_mode |= S_IFCHR; tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor), le64_to_cpu(pfindData->DevMinor) & MINORMASK); } else if (type == UNIX_BLOCKDEV) { *pobject_type = DT_BLK; tmp_inode->i_mode |= S_IFBLK; tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor), le64_to_cpu(pfindData->DevMinor) & MINORMASK); } else if (type == UNIX_FIFO) { *pobject_type = DT_FIFO; tmp_inode->i_mode |= S_IFIFO; } else if (type == UNIX_SOCKET) { *pobject_type = DT_SOCK; tmp_inode->i_mode |= S_IFSOCK; } else { /* safest to just call it a file */ *pobject_type = DT_REG; tmp_inode->i_mode |= S_IFREG; cFYI(1, ("unknown inode type %d", type)); } if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) tmp_inode->i_uid = cifs_sb->mnt_uid; else tmp_inode->i_uid = le64_to_cpu(pfindData->Uid); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) tmp_inode->i_gid = cifs_sb->mnt_gid; else tmp_inode->i_gid = le64_to_cpu(pfindData->Gid); tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks); spin_lock(&tmp_inode->i_lock); if (is_size_safe_to_change(cifsInfo, end_of_file)) { /* can not safely change the file size here if the client is writing to it due to potential races */ i_size_write(tmp_inode, end_of_file); /* 512 bytes (2**9) is the fake blocksize that must be used */ /* for this calculation, not the real blocksize */ tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9; } spin_unlock(&tmp_inode->i_lock); if (S_ISREG(tmp_inode->i_mode)) { cFYI(1, ("File inode")); tmp_inode->i_op = &cifs_file_inode_ops; if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) tmp_inode->i_fop = &cifs_file_direct_nobrl_ops; else tmp_inode->i_fop = &cifs_file_direct_ops; } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) tmp_inode->i_fop = &cifs_file_nobrl_ops; else tmp_inode->i_fop = &cifs_file_ops; if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server->maxBuf < PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)) tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf; else tmp_inode->i_data.a_ops = &cifs_addr_ops; if (isNewInode) return; /* No sense invalidating pages for new inode since we have not started caching readahead file data for it yet */ if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) && (local_size == tmp_inode->i_size)) { cFYI(1, ("inode exists but unchanged")); } else { /* file may have changed on server */ cFYI(1, ("invalidate inode, readdir detected change")); invalidate_remote_inode(tmp_inode); } } else if (S_ISDIR(tmp_inode->i_mode)) { cFYI(1, ("Directory inode")); tmp_inode->i_op = &cifs_dir_inode_ops; tmp_inode->i_fop = &cifs_dir_ops; } else if (S_ISLNK(tmp_inode->i_mode)) { cFYI(1, ("Symbolic Link inode")); tmp_inode->i_op = &cifs_symlink_inode_ops; /* tmp_inode->i_fop = *//* do not need to set to anything */ } else { cFYI(1, ("Special inode")); init_special_inode(tmp_inode, tmp_inode->i_mode, tmp_inode->i_rdev); } } 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; 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; } /* 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")); if (!cifsFile->srch_inf.endOfSearch && !cifsFile->invalidHandle) { cifsFile->invalidHandle = true; CIFSFindClose(xid, pTcon, cifsFile->netfid); } 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); } rc = initiate_cifs_search(xid, file); if (rc) { cFYI(1, ("error %d reinitiating a search on rewind", rc)); return rc; } } 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); 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, int max_len, ino_t *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); } /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) *pinum = pFindData->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 = 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) { /* BB fixme - test with long names */ /* Note converted filename can be longer than in unicode */ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) pqst->len = cifs_convertUCSpath((char *)pqst->name, (__le16 *)filename, len/2, nlt); else pqst->len = cifs_strfromUCS_le((char *)pqst->name, (__le16 *)filename, len/2, nlt); } else { pqst->name = filename; pqst->len = len; } pqst->hash = full_name_hash(pqst->name, pqst->len); /* cFYI(1, ("filldir on %s",pqst->name)); */ return rc; } static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir, void *direntry, char *scratch_buf, int max_len) { int rc = 0; struct qstr qstring; struct cifsFileInfo *pCifsF; unsigned int obj_type; ino_t inum; struct cifs_sb_info *cifs_sb; struct inode *tmp_inode; struct dentry *tmp_dentry; /* 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; cifs_sb = CIFS_SB(file->f_path.dentry->d_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; rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry); if ((tmp_inode == NULL) || (tmp_dentry == NULL)) return -ENOMEM; if (rc) { /* inode created, we need to hash it with right inode number */ if (inum != 0) { /* BB fixme - hash the 2 32 quantities bits together if * necessary BB */ tmp_inode->i_ino = inum; } insert_inode_hash(tmp_inode); } /* we pass in rc below, indicating whether it is a new inode, so we can figure out whether to invalidate the inode cached data if the file has changed */ if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) unix_fill_in_inode(tmp_inode, (FILE_UNIX_INFO *)pfindEntry, &obj_type, rc); else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */, pfindEntry, &obj_type, rc); else fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc); if (rc) /* new inode - needs to be tied to dentry */ { d_instantiate(tmp_dentry, tmp_inode); if (rc == 2) d_rehash(tmp_dentry); } rc = filldir(direntry, qstring.name, qstring.len, file->f_pos, tmp_inode->i_ino, obj_type); if (rc) { cFYI(1, ("filldir rc = %d", rc)); /* 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 */ rc = -EOVERFLOW; } dput(tmp_dentry); return rc; } 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; } 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; 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; /* 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. cifs_unicode.c, which actually does the conversion, has the same limit */ tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL); 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; }