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1d87c28e68
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: cifs: Cleanup: check return codes of crypto api calls CIFS: Fix oops while mounting with prefixpath [CIFS] Redundant null check after dereference cifs: use cifs_dirent in cifs_save_resume_key cifs: use cifs_dirent to replace cifs_get_name_from_search_buf cifs: introduce cifs_dirent cifs: cleanup cifs_filldir
825 lines
23 KiB
C
825 lines
23 KiB
C
/*
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* fs/cifs/readdir.c
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*
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* Directory search handling
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*
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* Copyright (C) International Business Machines Corp., 2004, 2008
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* Copyright (C) Red Hat, Inc., 2011
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "cifsfs.h"
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/*
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* To be safe - for UCS to UTF-8 with strings loaded with the rare long
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* characters alloc more to account for such multibyte target UTF-8
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* characters.
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*/
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#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
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#ifdef CONFIG_CIFS_DEBUG2
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static void dump_cifs_file_struct(struct file *file, char *label)
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{
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struct cifsFileInfo *cf;
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if (file) {
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cf = file->private_data;
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if (cf == NULL) {
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cFYI(1, "empty cifs private file data");
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return;
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}
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if (cf->invalidHandle)
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cFYI(1, "invalid handle");
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if (cf->srch_inf.endOfSearch)
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cFYI(1, "end of search");
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if (cf->srch_inf.emptyDir)
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cFYI(1, "empty dir");
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}
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}
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#else
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static inline void dump_cifs_file_struct(struct file *file, char *label)
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{
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}
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#endif /* DEBUG2 */
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/*
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* Find the dentry that matches "name". If there isn't one, create one. If it's
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* a negative dentry or the uniqueid changed, then drop it and recreate it.
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*/
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static struct dentry *
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cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
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struct cifs_fattr *fattr)
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{
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struct dentry *dentry, *alias;
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struct inode *inode;
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struct super_block *sb = parent->d_inode->i_sb;
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cFYI(1, "For %s", name->name);
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if (parent->d_op && parent->d_op->d_hash)
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parent->d_op->d_hash(parent, parent->d_inode, name);
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else
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name->hash = full_name_hash(name->name, name->len);
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dentry = d_lookup(parent, name);
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if (dentry) {
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/* FIXME: check for inode number changes? */
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if (dentry->d_inode != NULL)
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return dentry;
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d_drop(dentry);
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dput(dentry);
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}
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dentry = d_alloc(parent, name);
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if (dentry == NULL)
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return NULL;
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inode = cifs_iget(sb, fattr);
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if (!inode) {
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dput(dentry);
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return NULL;
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}
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alias = d_materialise_unique(dentry, inode);
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if (alias != NULL) {
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dput(dentry);
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if (IS_ERR(alias))
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return NULL;
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dentry = alias;
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}
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return dentry;
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}
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static void
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cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
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{
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fattr->cf_uid = cifs_sb->mnt_uid;
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fattr->cf_gid = cifs_sb->mnt_gid;
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if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
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fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
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fattr->cf_dtype = DT_DIR;
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} else {
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fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
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fattr->cf_dtype = DT_REG;
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}
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if (fattr->cf_cifsattrs & ATTR_READONLY)
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fattr->cf_mode &= ~S_IWUGO;
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
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fattr->cf_cifsattrs & ATTR_SYSTEM) {
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if (fattr->cf_eof == 0) {
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fattr->cf_mode &= ~S_IFMT;
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fattr->cf_mode |= S_IFIFO;
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fattr->cf_dtype = DT_FIFO;
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} else {
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/*
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* trying to get the type and mode via SFU can be slow,
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* so just call those regular files for now, and mark
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* for reval
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*/
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fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
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}
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}
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}
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static void
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cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
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struct cifs_sb_info *cifs_sb)
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{
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memset(fattr, 0, sizeof(*fattr));
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fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
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fattr->cf_eof = le64_to_cpu(info->EndOfFile);
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fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
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fattr->cf_createtime = le64_to_cpu(info->CreationTime);
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fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
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fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
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fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
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cifs_fill_common_info(fattr, cifs_sb);
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}
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static void
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cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
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struct cifs_sb_info *cifs_sb)
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{
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int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
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memset(fattr, 0, sizeof(*fattr));
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fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
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info->LastAccessTime, offset);
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fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
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info->LastWriteTime, offset);
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fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
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info->LastWriteTime, offset);
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fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
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fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
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fattr->cf_eof = le32_to_cpu(info->DataSize);
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cifs_fill_common_info(fattr, cifs_sb);
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}
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/* BB eventually need to add the following helper function to
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resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
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we try to do FindFirst on (NTFS) directory symlinks */
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/*
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int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
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int xid)
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{
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__u16 fid;
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int len;
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int oplock = 0;
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int rc;
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struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
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char *tmpbuffer;
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rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
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OPEN_REPARSE_POINT, &fid, &oplock, NULL,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (!rc) {
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tmpbuffer = kmalloc(maxpath);
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rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
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tmpbuffer,
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maxpath -1,
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fid,
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cifs_sb->local_nls);
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if (CIFSSMBClose(xid, ptcon, fid)) {
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cFYI(1, "Error closing temporary reparsepoint open");
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}
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}
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}
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*/
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static int initiate_cifs_search(const int xid, struct file *file)
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{
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int rc = 0;
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char *full_path = NULL;
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struct cifsFileInfo *cifsFile;
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struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
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struct tcon_link *tlink = NULL;
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struct cifs_tcon *pTcon;
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if (file->private_data == NULL) {
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tlink = cifs_sb_tlink(cifs_sb);
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if (IS_ERR(tlink))
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return PTR_ERR(tlink);
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cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
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if (cifsFile == NULL) {
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rc = -ENOMEM;
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goto error_exit;
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}
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file->private_data = cifsFile;
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cifsFile->tlink = cifs_get_tlink(tlink);
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pTcon = tlink_tcon(tlink);
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} else {
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cifsFile = file->private_data;
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pTcon = tlink_tcon(cifsFile->tlink);
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}
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cifsFile->invalidHandle = true;
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cifsFile->srch_inf.endOfSearch = false;
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full_path = build_path_from_dentry(file->f_path.dentry);
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if (full_path == NULL) {
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rc = -ENOMEM;
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goto error_exit;
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}
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cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
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ffirst_retry:
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/* test for Unix extensions */
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/* but now check for them on the share/mount not on the SMB session */
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/* if (pTcon->ses->capabilities & CAP_UNIX) { */
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if (pTcon->unix_ext)
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
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else if ((pTcon->ses->capabilities &
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(CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
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} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
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} else /* not srvinos - BB fixme add check for backlevel? */ {
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cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
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}
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rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
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&cifsFile->netfid, &cifsFile->srch_inf,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
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if (rc == 0)
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cifsFile->invalidHandle = false;
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/* BB add following call to handle readdir on new NTFS symlink errors
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else if STATUS_STOPPED_ON_SYMLINK
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call get_symlink_reparse_path and retry with new path */
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else if ((rc == -EOPNOTSUPP) &&
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(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
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cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
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goto ffirst_retry;
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}
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error_exit:
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kfree(full_path);
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cifs_put_tlink(tlink);
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return rc;
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}
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/* return length of unicode string in bytes */
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static int cifs_unicode_bytelen(const char *str)
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{
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int len;
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const __le16 *ustr = (const __le16 *)str;
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for (len = 0; len <= PATH_MAX; len++) {
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if (ustr[len] == 0)
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return len << 1;
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}
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cFYI(1, "Unicode string longer than PATH_MAX found");
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return len << 1;
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}
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static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
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{
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char *new_entry;
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FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
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if (level == SMB_FIND_FILE_INFO_STANDARD) {
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FIND_FILE_STANDARD_INFO *pfData;
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pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
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new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
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pfData->FileNameLength;
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} else
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new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
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cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
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/* validate that new_entry is not past end of SMB */
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if (new_entry >= end_of_smb) {
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cERROR(1, "search entry %p began after end of SMB %p old entry %p",
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new_entry, end_of_smb, old_entry);
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return NULL;
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} else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
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(new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
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|| ((level != SMB_FIND_FILE_INFO_STANDARD) &&
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(new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
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cERROR(1, "search entry %p extends after end of SMB %p",
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new_entry, end_of_smb);
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return NULL;
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} else
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return new_entry;
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}
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struct cifs_dirent {
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const char *name;
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size_t namelen;
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u32 resume_key;
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u64 ino;
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};
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static void cifs_fill_dirent_unix(struct cifs_dirent *de,
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const FILE_UNIX_INFO *info, bool is_unicode)
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{
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de->name = &info->FileName[0];
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if (is_unicode)
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de->namelen = cifs_unicode_bytelen(de->name);
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else
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de->namelen = strnlen(de->name, PATH_MAX);
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de->resume_key = info->ResumeKey;
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de->ino = le64_to_cpu(info->basic.UniqueId);
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}
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static void cifs_fill_dirent_dir(struct cifs_dirent *de,
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const FILE_DIRECTORY_INFO *info)
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{
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de->name = &info->FileName[0];
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de->namelen = le32_to_cpu(info->FileNameLength);
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de->resume_key = info->FileIndex;
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}
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static void cifs_fill_dirent_full(struct cifs_dirent *de,
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const FILE_FULL_DIRECTORY_INFO *info)
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{
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de->name = &info->FileName[0];
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de->namelen = le32_to_cpu(info->FileNameLength);
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de->resume_key = info->FileIndex;
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}
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static void cifs_fill_dirent_search(struct cifs_dirent *de,
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const SEARCH_ID_FULL_DIR_INFO *info)
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{
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de->name = &info->FileName[0];
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de->namelen = le32_to_cpu(info->FileNameLength);
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de->resume_key = info->FileIndex;
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de->ino = le64_to_cpu(info->UniqueId);
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}
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static void cifs_fill_dirent_both(struct cifs_dirent *de,
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const FILE_BOTH_DIRECTORY_INFO *info)
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{
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de->name = &info->FileName[0];
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de->namelen = le32_to_cpu(info->FileNameLength);
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de->resume_key = info->FileIndex;
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}
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static void cifs_fill_dirent_std(struct cifs_dirent *de,
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const FIND_FILE_STANDARD_INFO *info)
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{
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de->name = &info->FileName[0];
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/* one byte length, no endianess conversion */
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de->namelen = info->FileNameLength;
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de->resume_key = info->ResumeKey;
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}
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static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
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u16 level, bool is_unicode)
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{
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memset(de, 0, sizeof(*de));
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switch (level) {
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case SMB_FIND_FILE_UNIX:
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cifs_fill_dirent_unix(de, info, is_unicode);
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break;
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case SMB_FIND_FILE_DIRECTORY_INFO:
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cifs_fill_dirent_dir(de, info);
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break;
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case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
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cifs_fill_dirent_full(de, info);
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break;
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case SMB_FIND_FILE_ID_FULL_DIR_INFO:
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cifs_fill_dirent_search(de, info);
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break;
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case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
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cifs_fill_dirent_both(de, info);
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break;
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case SMB_FIND_FILE_INFO_STANDARD:
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cifs_fill_dirent_std(de, info);
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break;
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default:
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cFYI(1, "Unknown findfirst level %d", level);
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return -EINVAL;
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}
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return 0;
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}
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#define UNICODE_DOT cpu_to_le16(0x2e)
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/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
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static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
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{
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int rc = 0;
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if (!de->name)
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return 0;
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if (is_unicode) {
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__le16 *ufilename = (__le16 *)de->name;
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if (de->namelen == 2) {
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/* check for . */
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if (ufilename[0] == UNICODE_DOT)
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rc = 1;
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} else if (de->namelen == 4) {
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/* check for .. */
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if (ufilename[0] == UNICODE_DOT &&
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ufilename[1] == UNICODE_DOT)
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rc = 2;
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}
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} else /* ASCII */ {
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if (de->namelen == 1) {
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if (de->name[0] == '.')
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rc = 1;
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} else if (de->namelen == 2) {
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if (de->name[0] == '.' && de->name[1] == '.')
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|
rc = 2;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Check if directory that we are searching has changed so we can decide
|
|
whether we can use the cached search results from the previous search */
|
|
static int is_dir_changed(struct file *file)
|
|
{
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
|
|
|
|
if (cifsInfo->time == 0)
|
|
return 1; /* directory was changed, perhaps due to unlink */
|
|
else
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int cifs_save_resume_key(const char *current_entry,
|
|
struct cifsFileInfo *file_info)
|
|
{
|
|
struct cifs_dirent de;
|
|
int rc;
|
|
|
|
rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
|
|
file_info->srch_inf.unicode);
|
|
if (!rc) {
|
|
file_info->srch_inf.presume_name = de.name;
|
|
file_info->srch_inf.resume_name_len = de.namelen;
|
|
file_info->srch_inf.resume_key = de.resume_key;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/* find the corresponding entry in the search */
|
|
/* Note that the SMB server returns search entries for . and .. which
|
|
complicates logic here if we choose to parse for them and we do not
|
|
assume that they are located in the findfirst return buffer.*/
|
|
/* We start counting in the buffer with entry 2 and increment for every
|
|
entry (do not increment for . or .. entry) */
|
|
static int find_cifs_entry(const int xid, struct cifs_tcon *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");
|
|
spin_lock(&cifs_file_list_lock);
|
|
if (!cifsFile->srch_inf.endOfSearch &&
|
|
!cifsFile->invalidHandle) {
|
|
cifsFile->invalidHandle = true;
|
|
spin_unlock(&cifs_file_list_lock);
|
|
CIFSFindClose(xid, pTcon, cifsFile->netfid);
|
|
} else
|
|
spin_unlock(&cifs_file_list_lock);
|
|
if (cifsFile->srch_inf.ntwrk_buf_start) {
|
|
cFYI(1, "freeing SMB ff cache buf on search rewind");
|
|
if (cifsFile->srch_inf.smallBuf)
|
|
cifs_small_buf_release(cifsFile->srch_inf.
|
|
ntwrk_buf_start);
|
|
else
|
|
cifs_buf_release(cifsFile->srch_inf.
|
|
ntwrk_buf_start);
|
|
cifsFile->srch_inf.ntwrk_buf_start = NULL;
|
|
}
|
|
rc = initiate_cifs_search(xid, file);
|
|
if (rc) {
|
|
cFYI(1, "error %d reinitiating a search on rewind",
|
|
rc);
|
|
return rc;
|
|
}
|
|
cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
|
|
}
|
|
|
|
while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
|
|
(rc == 0) && !cifsFile->srch_inf.endOfSearch) {
|
|
cFYI(1, "calling findnext2");
|
|
rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
|
|
&cifsFile->srch_inf);
|
|
cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
|
|
if (rc)
|
|
return -ENOENT;
|
|
}
|
|
if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
|
|
/* we found the buffer that contains the entry */
|
|
/* scan and find it */
|
|
int i;
|
|
char *current_entry;
|
|
char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
|
|
smbCalcSize((struct smb_hdr *)
|
|
cifsFile->srch_inf.ntwrk_buf_start);
|
|
|
|
current_entry = cifsFile->srch_inf.srch_entries_start;
|
|
first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
|
|
- cifsFile->srch_inf.entries_in_buffer;
|
|
pos_in_buf = index_to_find - first_entry_in_buffer;
|
|
cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
|
|
|
|
for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
|
|
/* go entry by entry figuring out which is first */
|
|
current_entry = nxt_dir_entry(current_entry, end_of_smb,
|
|
cifsFile->srch_inf.info_level);
|
|
}
|
|
if ((current_entry == NULL) && (i < pos_in_buf)) {
|
|
/* BB fixme - check if we should flag this error */
|
|
cERROR(1, "reached end of buf searching for pos in buf"
|
|
" %d index to find %lld rc %d",
|
|
pos_in_buf, index_to_find, rc);
|
|
}
|
|
rc = 0;
|
|
*ppCurrentEntry = current_entry;
|
|
} else {
|
|
cFYI(1, "index not in buffer - could not findnext into it");
|
|
return 0;
|
|
}
|
|
|
|
if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
|
|
cFYI(1, "can not return entries pos_in_buf beyond last");
|
|
*num_to_ret = 0;
|
|
} else
|
|
*num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
|
|
void *dirent, char *scratch_buf, unsigned int max_len)
|
|
{
|
|
struct cifsFileInfo *file_info = file->private_data;
|
|
struct super_block *sb = file->f_path.dentry->d_sb;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
|
|
struct cifs_dirent de = { NULL, };
|
|
struct cifs_fattr fattr;
|
|
struct dentry *dentry;
|
|
struct qstr name;
|
|
int rc = 0;
|
|
ino_t ino;
|
|
|
|
rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
|
|
file_info->srch_inf.unicode);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (de.namelen > max_len) {
|
|
cERROR(1, "bad search response length %zd past smb end",
|
|
de.namelen);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* skip . and .. since we added them first */
|
|
if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
|
|
return 0;
|
|
|
|
if (file_info->srch_inf.unicode) {
|
|
struct nls_table *nlt = cifs_sb->local_nls;
|
|
|
|
name.name = scratch_buf;
|
|
name.len =
|
|
cifs_from_ucs2((char *)name.name, (__le16 *)de.name,
|
|
UNICODE_NAME_MAX,
|
|
min(de.namelen, (size_t)max_len), nlt,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
name.len -= nls_nullsize(nlt);
|
|
} else {
|
|
name.name = de.name;
|
|
name.len = de.namelen;
|
|
}
|
|
|
|
switch (file_info->srch_inf.info_level) {
|
|
case SMB_FIND_FILE_UNIX:
|
|
cifs_unix_basic_to_fattr(&fattr,
|
|
&((FILE_UNIX_INFO *)find_entry)->basic,
|
|
cifs_sb);
|
|
break;
|
|
case SMB_FIND_FILE_INFO_STANDARD:
|
|
cifs_std_info_to_fattr(&fattr,
|
|
(FIND_FILE_STANDARD_INFO *)find_entry,
|
|
cifs_sb);
|
|
break;
|
|
default:
|
|
cifs_dir_info_to_fattr(&fattr,
|
|
(FILE_DIRECTORY_INFO *)find_entry,
|
|
cifs_sb);
|
|
break;
|
|
}
|
|
|
|
if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
|
|
fattr.cf_uniqueid = de.ino;
|
|
} else {
|
|
fattr.cf_uniqueid = iunique(sb, ROOT_I);
|
|
cifs_autodisable_serverino(cifs_sb);
|
|
}
|
|
|
|
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
|
|
CIFSCouldBeMFSymlink(&fattr))
|
|
/*
|
|
* trying to get the type and mode can be slow,
|
|
* so just call those regular files for now, and mark
|
|
* for reval
|
|
*/
|
|
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
|
|
|
|
ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
|
|
dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
|
|
|
|
rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
|
|
fattr.cf_dtype);
|
|
|
|
dput(dentry);
|
|
return rc;
|
|
}
|
|
|
|
|
|
int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
|
|
{
|
|
int rc = 0;
|
|
int xid, i;
|
|
struct cifs_tcon *pTcon;
|
|
struct cifsFileInfo *cifsFile = NULL;
|
|
char *current_entry;
|
|
int num_to_fill = 0;
|
|
char *tmp_buf = NULL;
|
|
char *end_of_smb;
|
|
unsigned int max_len;
|
|
|
|
xid = GetXid();
|
|
|
|
/*
|
|
* Ensure FindFirst doesn't fail before doing filldir() for '.' and
|
|
* '..'. Otherwise we won't be able to notify VFS in case of failure.
|
|
*/
|
|
if (file->private_data == NULL) {
|
|
rc = initiate_cifs_search(xid, file);
|
|
cFYI(1, "initiate cifs search rc %d", rc);
|
|
if (rc)
|
|
goto rddir2_exit;
|
|
}
|
|
|
|
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,
|
|
parent_ino(file->f_path.dentry), 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 = -EINVAL;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
cifsFile = file->private_data;
|
|
if (cifsFile->srch_inf.endOfSearch) {
|
|
if (cifsFile->srch_inf.emptyDir) {
|
|
cFYI(1, "End of search, empty dir");
|
|
rc = 0;
|
|
break;
|
|
}
|
|
} /* else {
|
|
cifsFile->invalidHandle = true;
|
|
CIFSFindClose(xid, pTcon, cifsFile->netfid);
|
|
} */
|
|
|
|
pTcon = tlink_tcon(cifsFile->tlink);
|
|
rc = find_cifs_entry(xid, pTcon, file,
|
|
¤t_entry, &num_to_fill);
|
|
if (rc) {
|
|
cFYI(1, "fce error %d", rc);
|
|
goto rddir2_exit;
|
|
} else if (current_entry != NULL) {
|
|
cFYI(1, "entry %lld found", file->f_pos);
|
|
} else {
|
|
cFYI(1, "could not find entry");
|
|
goto rddir2_exit;
|
|
}
|
|
cFYI(1, "loop through %d times filling dir for net buf %p",
|
|
num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
|
|
max_len = smbCalcSize((struct smb_hdr *)
|
|
cifsFile->srch_inf.ntwrk_buf_start);
|
|
end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
|
|
|
|
tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
|
|
if (tmp_buf == NULL) {
|
|
rc = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
|
|
if (current_entry == NULL) {
|
|
/* evaluate whether this case is an error */
|
|
cERROR(1, "past SMB end, num to fill %d i %d",
|
|
num_to_fill, i);
|
|
break;
|
|
}
|
|
/* if buggy server returns . and .. late do
|
|
we want to check for that here? */
|
|
rc = cifs_filldir(current_entry, file,
|
|
filldir, direntry, tmp_buf, max_len);
|
|
if (rc == -EOVERFLOW) {
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
file->f_pos++;
|
|
if (file->f_pos ==
|
|
cifsFile->srch_inf.index_of_last_entry) {
|
|
cFYI(1, "last entry in buf at pos %lld %s",
|
|
file->f_pos, tmp_buf);
|
|
cifs_save_resume_key(current_entry, cifsFile);
|
|
break;
|
|
} else
|
|
current_entry =
|
|
nxt_dir_entry(current_entry, end_of_smb,
|
|
cifsFile->srch_inf.info_level);
|
|
}
|
|
kfree(tmp_buf);
|
|
break;
|
|
} /* end switch */
|
|
|
|
rddir2_exit:
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|