dir.c 20.1 KB
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/*
 *   fs/cifs/dir.c
 *
 *   vfs operations that deal with dentries
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 *
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 *   Copyright (C) International Business Machines  Corp., 2002,2009
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 *   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/stat.h>
#include <linux/slab.h>
#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/file.h>
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#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

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static void
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renew_parental_timestamps(struct dentry *direntry)
{
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	/* BB check if there is a way to get the kernel to do this or if we
	   really need this */
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	do {
		direntry->d_time = jiffies;
		direntry = direntry->d_parent;
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	} while (!IS_ROOT(direntry));
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}

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
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	int namelen;
	int pplen;
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	int dfsplen;
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	char *full_path;
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	char dirsep;
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	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
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	if (direntry == NULL)
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		return NULL;  /* not much we can do if dentry is freed and
		we need to reopen the file after it was closed implicitly
		when the server crashed */

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	dirsep = CIFS_DIR_SEP(cifs_sb);
	pplen = cifs_sb->prepathlen;
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	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
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	else
		dfsplen = 0;
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cifs_bp_rename_retry:
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	namelen = pplen + dfsplen;
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	for (temp = direntry; !IS_ROOT(temp);) {
		namelen += (1 + temp->d_name.len);
		temp = temp->d_parent;
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		if (temp == NULL) {
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			cERROR(1, "corrupt dentry");
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			return NULL;
		}
	}

	full_path = kmalloc(namelen+1, GFP_KERNEL);
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	if (full_path == NULL)
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		return full_path;
	full_path[namelen] = 0;	/* trailing null */
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			break;
		} else {
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			full_path[namelen] = dirsep;
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			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
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			cFYI(0, "name: %s", full_path + namelen);
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		}
		temp = temp->d_parent;
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		if (temp == NULL) {
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			cERROR(1, "corrupt dentry");
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			kfree(full_path);
			return NULL;
		}
	}
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	if (namelen != pplen + dfsplen) {
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		cERROR(1, "did not end path lookup where expected namelen is %d",
			namelen);
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		/* presumably this is only possible if racing with a rename
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		of one of the parent directories  (we can not lock the dentries
		above us to prevent this, but retrying should be harmless) */
		kfree(full_path);
		goto cifs_bp_rename_retry;
	}
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	/* DIR_SEP already set for byte  0 / vs \ but not for
	   subsequent slashes in prepath which currently must
	   be entered the right way - not sure if there is an alternative
	   since the '\' is a valid posix character so we can not switch
	   those safely to '/' if any are found in the middle of the prepath */
	/* BB test paths to Windows with '/' in the midst of prepath */
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	if (dfsplen) {
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		strncpy(full_path, tcon->treeName, dfsplen);
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		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
			int i;
			for (i = 0; i < dfsplen; i++) {
				if (full_path[i] == '\\')
					full_path[i] = '/';
			}
		}
	}
	strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
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	return full_path;
}

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static void setup_cifs_dentry(struct cifsTconInfo *tcon,
			      struct dentry *direntry,
			      struct inode *newinode)
{
	if (tcon->nocase)
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		d_set_d_op(direntry, &cifs_ci_dentry_ops);
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	else
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		d_set_d_op(direntry, &cifs_dentry_ops);
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	d_instantiate(direntry, newinode);
}

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/* Inode operations in similar order to how they appear in Linux file fs.h */
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int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
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	int create_options = CREATE_NOT_DIR;
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	__u32 oplock = 0;
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	int oflags;
	/*
	 * BB below access is probably too much for mknod to request
	 *    but we have to do query and setpathinfo so requesting
	 *    less could fail (unless we want to request getatr and setatr
	 *    permissions (only).  At least for POSIX we do not have to
	 *    request so much.
	 */
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	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
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	struct tcon_link *tlink;
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	struct cifsTconInfo *tcon;
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	char *full_path = NULL;
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	FILE_ALL_INFO *buf = NULL;
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	struct inode *newinode = NULL;
	int disposition = FILE_OVERWRITE_IF;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
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	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		FreeXid(xid);
		return PTR_ERR(tlink);
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	}
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	tcon = tlink_tcon(tlink);
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	if (oplockEnabled)
		oplock = REQ_OPLOCK;
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	if (nd && (nd->flags & LOOKUP_OPEN))
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		oflags = nd->intent.open.file->f_flags;
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	else
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		oflags = O_RDONLY | O_CREAT;
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	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto cifs_create_out;
	}

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	if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
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		rc = cifs_posix_open(full_path, &newinode,
			inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
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		/* EIO could indicate that (posix open) operation is not
		   supported, despite what server claimed in capability
		   negotation.  EREMOTE indicates DFS junction, which is not
		   handled in posix open */

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		if (rc == 0) {
			if (newinode == NULL) /* query inode info */
				goto cifs_create_get_file_info;
			else /* success, no need to query */
				goto cifs_create_set_dentry;
		} else if ((rc != -EIO) && (rc != -EREMOTE) &&
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			 (rc != -EOPNOTSUPP) && (rc != -EINVAL))
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			goto cifs_create_out;
		/* else fallthrough to retry, using older open call, this is
		   case where server does not support this SMB level, and
		   falsely claims capability (also get here for DFS case
		   which should be rare for path not covered on files) */
	}
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	if (nd && (nd->flags & LOOKUP_OPEN)) {
		/* if the file is going to stay open, then we
		   need to set the desired access properly */
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		desiredAccess = 0;
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		if (OPEN_FMODE(oflags) & FMODE_READ)
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			desiredAccess |= GENERIC_READ; /* is this too little? */
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		if (OPEN_FMODE(oflags) & FMODE_WRITE)
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			desiredAccess |= GENERIC_WRITE;
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		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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			disposition = FILE_CREATE;
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		else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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			disposition = FILE_OVERWRITE_IF;
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		else if ((oflags & O_CREAT) == O_CREAT)
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			disposition = FILE_OPEN_IF;
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		else
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			cFYI(1, "Create flag not set in create function");
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	}

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	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */
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	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
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		rc = -ENOMEM;
		goto cifs_create_out;
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	}
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	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
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	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
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		create_options |= CREATE_OPTION_READONLY;

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	if (tcon->ses->capabilities & CAP_NT_SMBS)
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		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
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			 desiredAccess, create_options,
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			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

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	if (rc == -EIO) {
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		/* old server, retry the open legacy style */
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		rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
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			desiredAccess, create_options,
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			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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	}
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	if (rc) {
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		cFYI(1, "cifs_create returned 0x%x", rc);
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		goto cifs_create_out;
	}

	/* If Open reported that we actually created a file
	   then we now have to set the mode if possible */
	if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
		struct cifs_unix_set_info_args args = {
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				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
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		};

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			if (inode->i_mode & S_ISGID)
				args.gid = (__u64) inode->i_gid;
			else
				args.gid = (__u64) current_fsgid();
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		} else {
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			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
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		}
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		CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
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	} else {
		/* BB implement mode setting via Windows security
		   descriptors e.g. */
		/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/

		/* Could set r/o dos attribute if mode & 0222 == 0 */
	}
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cifs_create_get_file_info:
	/* server might mask mode so we have to query for it */
	if (tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newinode, full_path,
					      inode->i_sb, xid);
	else {
		rc = cifs_get_inode_info(&newinode, full_path, buf,
					 inode->i_sb, xid, &fileHandle);
		if (newinode) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
				newinode->i_mode = mode;
			if ((oplock & CIFS_CREATE_ACTION) &&
			    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
				newinode->i_uid = current_fsuid();
				if (inode->i_mode & S_ISGID)
					newinode->i_gid = inode->i_gid;
				else
					newinode->i_gid = current_fsgid();
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			}
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		}
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	}
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cifs_create_set_dentry:
	if (rc == 0)
		setup_cifs_dentry(tcon, direntry, newinode);
	else
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		cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
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	if (newinode && nd && (nd->flags & LOOKUP_OPEN)) {
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		struct cifsFileInfo *pfile_info;
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		struct file *filp;

		filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
		if (IS_ERR(filp)) {
			rc = PTR_ERR(filp);
			CIFSSMBClose(xid, tcon, fileHandle);
			goto cifs_create_out;
		}

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		pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
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		if (pfile_info == NULL) {
			fput(filp);
			CIFSSMBClose(xid, tcon, fileHandle);
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			rc = -ENOMEM;
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		}
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	} else {
		CIFSSMBClose(xid, tcon, fileHandle);
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	}
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cifs_create_out:
	kfree(buf);
	kfree(full_path);
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	cifs_put_tlink(tlink);
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	FreeXid(xid);
	return rc;
}

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int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
		dev_t device_number)
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{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
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	struct tcon_link *tlink;
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	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
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	struct inode *newinode = NULL;
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	int oplock = 0;
	u16 fileHandle;
	FILE_ALL_INFO *buf = NULL;
	unsigned int bytes_written;
	struct win_dev *pdev;
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	if (!old_valid_dev(device_number))
		return -EINVAL;

	cifs_sb = CIFS_SB(inode->i_sb);
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	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);

	pTcon = tlink_tcon(tlink);

	xid = GetXid();
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	full_path = build_path_from_dentry(direntry);
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	if (full_path == NULL) {
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		rc = -ENOMEM;
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		goto mknod_out;
	}

	if (pTcon->unix_ext) {
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		struct cifs_unix_set_info_args args = {
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			.mode	= mode & ~current_umask(),
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			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= device_number,
		};
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		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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			args.uid = (__u64) current_fsuid();
			args.gid = (__u64) current_fsgid();
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		} else {
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			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
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		}
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		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
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		if (rc)
			goto mknod_out;
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		rc = cifs_get_inode_info_unix(&newinode, full_path,
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						inode->i_sb, xid);
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		if (pTcon->nocase)
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			d_set_d_op(direntry, &cifs_ci_dentry_ops);
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		else
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			d_set_d_op(direntry, &cifs_dentry_ops);
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		if (rc == 0)
			d_instantiate(direntry, newinode);
		goto mknod_out;
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	}

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	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
		goto mknod_out;


	cFYI(1, "sfu compat create special file");

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		rc = -ENOMEM;
		FreeXid(xid);
		return rc;
	}

	/* FIXME: would WRITE_OWNER | WRITE_DAC be better? */
	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
			 GENERIC_WRITE, CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc)
		goto mknod_out;

	/* BB Do not bother to decode buf since no local inode yet to put
	 * timestamps in, but we can reuse it safely */

	pdev = (struct win_dev *)buf;
	if (S_ISCHR(mode)) {
		memcpy(pdev->type, "IntxCHR", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, pTcon,
			fileHandle,
			sizeof(struct win_dev),
			0, &bytes_written, (char *)pdev,
			NULL, 0);
	} else if (S_ISBLK(mode)) {
		memcpy(pdev->type, "IntxBLK", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, pTcon,
			fileHandle,
			sizeof(struct win_dev),
			0, &bytes_written, (char *)pdev,
			NULL, 0);
	} /* else if (S_ISFIFO) */
	CIFSSMBClose(xid, pTcon, fileHandle);
	d_drop(direntry);

	/* FIXME: add code here to set EAs */

mknod_out:
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	kfree(full_path);
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	kfree(buf);
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	FreeXid(xid);
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	cifs_put_tlink(tlink);
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	return rc;
}

struct dentry *
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cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    struct nameidata *nd)
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{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
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	__u32 oplock = 0;
502 503
	__u16 fileHandle = 0;
	bool posix_open = false;
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	struct cifs_sb_info *cifs_sb;
505
	struct tcon_link *tlink;
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	struct cifsTconInfo *pTcon;
507
	struct cifsFileInfo *cfile;
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	struct inode *newInode = NULL;
	char *full_path = NULL;
510
	struct file *filp;
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	xid = GetXid();

514 515
	cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry);
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	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
520 521 522 523 524 525
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		FreeXid(xid);
		return (struct dentry *)tlink;
	}
	pTcon = tlink_tcon(tlink);
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527 528 529 530 531 532 533 534
	/*
	 * Don't allow the separator character in a path component.
	 * The VFS will not allow "/", but "\" is allowed by posix.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		int i;
		for (i = 0; i < direntry->d_name.len; i++)
			if (direntry->d_name.name[i] == '\\') {
535
				cFYI(1, "Invalid file name");
536 537
				rc = -EINVAL;
				goto lookup_out;
538 539 540
			}
	}

541 542 543 544
	/*
	 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
	 * the VFS handle the create.
	 */
545
	if (nd && (nd->flags & LOOKUP_EXCL)) {
546
		d_instantiate(direntry, NULL);
547 548
		rc = 0;
		goto lookup_out;
549 550
	}

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	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
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	if (full_path == NULL) {
556 557
		rc = -ENOMEM;
		goto lookup_out;
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	}

	if (direntry->d_inode != NULL) {
561
		cFYI(1, "non-NULL inode in lookup");
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	} else {
563
		cFYI(1, "NULL inode in lookup");
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	}
565
	cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
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567 568 569 570 571 572 573 574 575 576
	/* Posix open is only called (at lookup time) for file create now.
	 * For opens (rather than creates), because we do not know if it
	 * is a file or directory yet, and current Samba no longer allows
	 * us to do posix open on dirs, we could end up wasting an open call
	 * on what turns out to be a dir. For file opens, we wait to call posix
	 * open till cifs_open.  It could be added here (lookup) in the future
	 * but the performance tradeoff of the extra network request when EISDIR
	 * or EACCES is returned would have to be weighed against the 50%
	 * reduction in network traffic in the other paths.
	 */
577
	if (pTcon->unix_ext) {
578
		if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
579
		     (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
580
		     (nd->intent.open.file->f_flags & O_CREAT)) {
581
			rc = cifs_posix_open(full_path, &newInode,
582
					parent_dir_inode->i_sb,
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					nd->intent.open.create_mode,
584
					nd->intent.open.file->f_flags, &oplock,
585
					&fileHandle, xid);
586 587 588 589 590 591 592 593 594 595 596
			/*
			 * The check below works around a bug in POSIX
			 * open in samba versions 3.3.1 and earlier where
			 * open could incorrectly fail with invalid parameter.
			 * If either that or op not supported returned, follow
			 * the normal lookup.
			 */
			if ((rc == 0) || (rc == -ENOENT))
				posix_open = true;
			else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
				pTcon->broken_posix_open = true;
597 598 599 600 601
		}
		if (!posix_open)
			rc = cifs_get_inode_info_unix(&newInode, full_path,
						parent_dir_inode->i_sb, xid);
	} else
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		rc = cifs_get_inode_info(&newInode, full_path, NULL,
603
				parent_dir_inode->i_sb, xid, NULL);
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	if ((rc == 0) && (newInode != NULL)) {
606
		if (pTcon->nocase)
607
			d_set_d_op(direntry, &cifs_ci_dentry_ops);
608
		else
609
			d_set_d_op(direntry, &cifs_dentry_ops);
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		d_add(direntry, newInode);
611
		if (posix_open) {
612 613 614 615 616 617 618 619
			filp = lookup_instantiate_filp(nd, direntry,
						       generic_file_open);
			if (IS_ERR(filp)) {
				rc = PTR_ERR(filp);
				CIFSSMBClose(xid, pTcon, fileHandle);
				goto lookup_out;
			}

620 621
			cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
						  oplock);
622
			if (cfile == NULL) {
623
				fput(filp);
624 625 626 627 628
				CIFSSMBClose(xid, pTcon, fileHandle);
				rc = -ENOMEM;
				goto lookup_out;
			}
		}
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		/* since paths are not looked up by component - the parent
630
		   directories are presumed to be good here */
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		renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
		rc = 0;
635 636
		direntry->d_time = jiffies;
		if (pTcon->nocase)
637
			d_set_d_op(direntry, &cifs_ci_dentry_ops);
638
		else
639
			d_set_d_op(direntry, &cifs_dentry_ops);
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		d_add(direntry, NULL);
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	/*	if it was once a directory (but how can we tell?) we could do
		shrink_dcache_parent(direntry); */
643
	} else if (rc != -EACCES) {
644
		cERROR(1, "Unexpected lookup error %d", rc);
645 646
		/* We special case check for Access Denied - since that
		is a common return code */
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647 648
	}

649
lookup_out:
650
	kfree(full_path);
651
	cifs_put_tlink(tlink);
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	FreeXid(xid);
	return ERR_PTR(rc);
}

static int
cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
{
	if (direntry->d_inode) {
660
		if (cifs_revalidate_dentry(direntry))
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			return 0;
662 663
		else
			return 1;
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	}

666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
	/*
	 * This may be nfsd (or something), anyway, we can't see the
	 * intent of this. So, since this can be for creation, drop it.
	 */
	if (!nd)
		return 0;

	/*
	 * Drop the negative dentry, in order to make sure to use the
	 * case sensitive name which is specified by user if this is
	 * for creation.
	 */
	if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
		if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
			return 0;
	}

	if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
		return 0;

	return 1;
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}

/* static int cifs_d_delete(struct dentry *direntry)
{
	int rc = 0;

693
	cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
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	return rc;
}     */

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const struct dentry_operations cifs_dentry_ops = {
L
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699
	.d_revalidate = cifs_d_revalidate,
S
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700
/* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
L
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701
};
702

N
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703 704
static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
		struct qstr *q)
705
{
N
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706
	struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
707 708 709 710 711 712 713 714 715 716 717 718
	unsigned long hash;
	int i;

	hash = init_name_hash();
	for (i = 0; i < q->len; i++)
		hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
					 hash);
	q->hash = end_name_hash(hash);

	return 0;
}

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static int cifs_ci_compare(const struct dentry *parent,
		const struct inode *pinode,
		const struct dentry *dentry, const struct inode *inode,
		unsigned int len, const char *str, const struct qstr *name)
723
{
N
Nick Piggin 已提交
724
	struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
725

N
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726 727
	if ((name->len == len) &&
	    (nls_strnicmp(codepage, name->name, str, len) == 0))
728 729 730 731
		return 0;
	return 1;
}

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const struct dentry_operations cifs_ci_dentry_ops = {
733 734 735 736
	.d_revalidate = cifs_d_revalidate,
	.d_hash = cifs_ci_hash,
	.d_compare = cifs_ci_compare,
};