path: root/fs/cifs/readdir.c

/*
 *   fs/cifs/readdir.c
 *
 *   Directory search handling
 *
 *   Copyright (C) International Business Machines  Corp., 2004, 2008
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifsfs.h"

#ifdef CONFIG_CIFS_DEBUG2
static void dump_cifs_file_struct(struct file *file, char *label)
{
	struct cifsFileInfo *cf;

	if (file) {
		cf = file->private_data;
		if (cf == NULL) {
			cFYI(1, ("empty cifs private file data"));
			return;
		}
		if (cf->invalidHandle)
			cFYI(1, ("invalid handle"));
		if (cf->srch_inf.endOfSearch)
			cFYI(1, ("end of search"));
		if (cf->srch_inf.emptyDir)
			cFYI(1, ("empty dir"));
	}
}
#else
static inline void dump_cifs_file_struct(struct file *file, char *label)
{
}
#endif /* DEBUG2 */

/* Returns one if new inode created (which therefore needs to be hashed) */
/* Might check in the future if inode number changed so we can rehash inode */
static int construct_dentry(struct qstr *qstring, struct file *file,
	struct inode **ptmp_inode, struct dentry **pnew_dentry)
{
	struct dentry *tmp_dentry;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	int rc = 0;

	cFYI(1, ("For %s", qstring->name));
	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
	pTcon = cifs_sb->tcon;

	qstring->hash = full_name_hash(qstring->name, qstring->len);
	tmp_dentry = d_lookup(file->f_path.dentry, qstring);
	if (tmp_dentry) {
		cFYI(0, ("existing dentry with inode 0x%p",
			 tmp_dentry->d_inode));
		*ptmp_inode = tmp_dentry->d_inode;
/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
		if (*ptmp_inode == NULL) {
			*ptmp_inode = new_inode(file->f_path.dentry->d_sb);
			if (*ptmp_inode == NULL)
				return rc;
			rc = 1;
		}
		if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
			(*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
	} else {
		tmp_dentry = d_alloc(file->f_path.dentry, qstring);
		if (tmp_dentry == NULL) {
			cERROR(1, ("Failed allocating dentry"));
			*ptmp_inode = NULL;
			return rc;
		}

		*ptmp_inode = new_inode(file->f_path.dentry->d_sb);
		if (pTcon->nocase)
			tmp_dentry->d_op = &cifs_ci_dentry_ops;
		else
			tmp_dentry->d_op = &cifs_dentry_ops;
		if (*ptmp_inode == NULL)
			return rc;
		if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
			(*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
		rc = 2;
	}

	tmp_dentry->d_time = jiffies;
	*pnew_dentry = tmp_dentry;
	return rc;
}

static void AdjustForTZ(struct