| /* |
| * fs/cifs/readdir.c |
| * |
| * Directory search handling |
| * |
| * Copyright (C) International Business Machines Corp., 2004, 2007 |
| * 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")); |
| } |
| |
| } |
| } |
| #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, 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 */ |
| /* 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; |
| 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); |
| else if ((tmp_inode->i_mode & S_IWUGO) == 0) |
| /* the ATTR_READONLY flag may have been changed on */ |
| /* server -- set any w bits allowed by mnt_file_mode */ |
| tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode); |
| } /* 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); |
| } |
| |
| 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, 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 */ |
| 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 = 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 */ |
| |
| #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")); |
| *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 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); |
| } |
| 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); |
| 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; |
| } |