/* * fs/cifs/readdir.c * * Directory search handling * * Copyright (C) International Business Machines Corp., 2004, 2005 * 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 <linux/smp_lock.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")); } } } #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_dentry->d_sb); pTcon = cifs_sb->tcon; qstring->hash = full_name_hash(qstring->name, qstring->len); tmp_dentry = d_lookup(file->f_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_dentry->d_sb); if(*ptmp_inode == NULL) return rc; rc = 1; } } else { tmp_dentry = d_alloc(file->f_dentry, qstring); if(tmp_dentry == NULL) { cERROR(1,("Failed allocating dentry")); *ptmp_inode = NULL; return rc; } *ptmp_inode = new_inode(file->f_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; rc = 2; } tmp_dentry->d_time = jiffies; *pnew_dentry = tmp_dentry; return rc; } static void fill_in_inode(struct inode *tmp_inode, int new_buf_type, char * buf, 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; /* 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 */ FIND_FILE_STANDARD_INFO * pfindData = (FIND_FILE_STANDARD_INFO *)buf; attr = le16_to_cpu(pfindData->Attributes); allocation_size = le32_to_cpu(pfindData->AllocationSize); end_of_file = le32_to_cpu(pfindData->DataSize); tmp_inode->i_atime = CURRENT_TIME; /* tmp_inode->i_mtime = BB FIXME - add dos time handling tmp_inode->i_ctime = 0; BB FIXME */ } /* Linux can not store file creation time unfortunately so ignore it */ cifsInfo->cifsAttrs = attr; 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; /* set default mode. will override for dirs below */ tmp_inode->i_mode = cifs_sb->mnt_file_mode; } else { /* mask off the type bits since it gets set below and we do not want to get two type bits set */ tmp_inode->i_mode &= ~S_IFMT; } if (attr & ATTR_DIRECTORY) { *pobject_type = DT_DIR; /* override default perms since we do not lock dirs */ if(atomic_read(&cifsInfo->inUse) == 0) { tmp_inode->i_mode = cifs_sb->mnt_dir_mode; } tmp_inode->i_mode |= S_IFDIR; } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) && (attr & ATTR_SYSTEM)) { if (end_of_file == 0) { *pobject_type = DT_FIFO; tmp_inode->i_mode |= S_IFIFO; } else { /* rather than get the type here, we mark the inode as needing revalidate and get the real type (blk vs chr vs. symlink) later ie in lookup */ *pobject_type = DT_REG; tmp_inode->i_mode |= S_IFREG; cifsInfo->time = 0; } /* we no longer mark these because we could not follow them */ /* } else if (attr & ATTR_REPARSE) { *pobject_type = DT_LNK; tmp_inode->i_mode |= S_IFLNK; */ } else { *pobject_type = DT_REG; tmp_inode->i_mode |= S_IFREG; if (attr & ATTR_READONLY) tmp_inode->i_mode &= ~(S_IWUGO); } /* could add code here - to validate if device or weird share type? */ /* can not fill in nlink here as in qpathinfo version and Unx search */ if (atomic_read(&cifsInfo->inUse) == 0) { atomic_set(&cifsInfo->inUse, 1); } if (is_size_safe_to_change(cifsInfo)) { /* 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; } 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, 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)); } tmp_inode->i_uid = le64_to_cpu(pfindData->Uid); tmp_inode->i_gid = le64_to_cpu(pfindData->Gid); tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks); if (is_size_safe_to_change(cifsInfo)) { /* 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; } 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 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 = kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL); } if(file->private_data == NULL) { return -ENOMEM; } else { memset(file->private_data,0,sizeof(struct cifsFileInfo)); } cifsFile = file->private_data; cifsFile->invalidHandle = TRUE; cifsFile->srch_inf.endOfSearch = FALSE; if(file->f_dentry == NULL) return -ENOENT; cifs_sb = CIFS_SB(file->f_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_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 */ if (pTcon->ses->capabilities & CAP_UNIX) { 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; struct cifsInodeInfo *cifsInfo; if(file->f_dentry == NULL) return 0; inode = file->f_dentry->d_inode; if(inode == NULL) return 0; 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 */ #ifdef CONFIG_CIFS_DEBUG2 dump_cifs_file_struct(file, "In fce "); #endif 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")); cifsFile->invalidHandle = TRUE; CIFSFindClose(xid, pTcon, cifsFile->netfid); kfree(cifsFile->search_resume_name); cifsFile->search_resume_name = NULL; 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 == FALSE)){ 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 entry")); *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 fixme */ 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 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; if(file->f_dentry == 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_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)); } 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; } 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(); if(file->f_dentry == NULL) { FreeXid(xid); return -EIO; } cifs_sb = CIFS_SB(file->f_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_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_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); } kfree(cifsFile->search_resume_name); cifsFile->search_resume_name = NULL; */ 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 end of SMB 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); 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; }