[net-next-2.6.git] / fs / cifs / dir.c

/*
 *   fs/cifs/dir.c
 *
 *   vfs operations that deal with dentries
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2008
 *   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/stat.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

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

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
	int pplen;
	int dfsplen;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb;

	if (direntry == NULL)
		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 */

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

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if (full_path == NULL)
		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 {
			full_path[namelen] = dirsep;
			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
			cFYI(0, ("name: %s", full_path + namelen));
		}
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, ("corrupt dentry"));
			kfree(full_path);
			return NULL;
		}
	}
	if (namelen != pplen + dfsplen) {
		cERROR(1,
		       ("did not end path lookup where expected namelen is %d",
			namelen));
		/* presumably this is only possible if racing with a rename
		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;
	}
	/* 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 */

	if (dfsplen) {
		strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
		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);
	return full_path;
}

/* Inode operations in similar order to how they appear in Linux file fs.h */

int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	int create_options = CREATE_NOT_DIR;
	int oplock = 0;
	int desiredAccess = GENERIC_READ | GENERIC_WRITE;
	__u16 fileHandle;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	struct cifsFileInfo *pCifsFile = NULL;
	struct cifsInodeInfo *pCifsInode;
	int disposition = FILE_OVERWRITE_IF;
	bool write_only = false;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if (nd && (nd->flags & LOOKUP_OPEN)) {
		int oflags = nd->intent.open.flags;

		desiredAccess = 0;
		if (oflags & FMODE_READ)
			desiredAccess |= GENERIC_READ;
		if (oflags & FMODE_WRITE) {
			desiredAccess |= GENERIC_WRITE;
			if (!(oflags & FMODE_READ))
				write_only = true;
		}

		if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if ((oflags & O_CREAT) == O_CREAT)
			disposition = FILE_OPEN_IF;
		else
			cFYI(1, ("Create flag not set in create function"));
	}

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */
	if (oplockEnabled)
		oplock = REQ_OPLOCK;

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

	mode &= ~current->fs->umask;

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!pTcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

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

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
			desiredAccess, create_options,
			&fileHandle, &oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, ("cifs_create returned 0x%x", rc));
	} else {
		/* If Open reported that we actually created a file
		then we now have to set the mode if possible */
		if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
			struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
			};

			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				args.uid = (__u64) current->fsuid;
				args.gid = (__u64) current->fsgid;
			} else {
				args.uid = NO_CHANGE_64;
				args.gid = NO_CHANGE_64;
			}

			CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		} else {
			/* BB implement mode setting via Windows security
			   descriptors e.g. */
			/* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/

			/* Could set r/o dos attribute if mode & 0222 == 0 */
		}

		/* server might mask mode so we have to query for it */
		if (pTcon->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;
					newinode->i_gid = current->fsgid;
				}
			}
		}

		if (rc != 0) {
			cFYI(1,
			     ("Create worked but get_inode_info failed rc = %d",
			      rc));
		} else {
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			d_instantiate(direntry, newinode);
		}
		if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
			(!(nd->flags & LOOKUP_OPEN))) {
			/* mknod case - do not leave file open */
			CIFSSMBClose(xid, pTcon, fileHandle);
		} else if (newinode) {
			pCifsFile =
			   kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);

			if (pCifsFile == NULL)
				goto cifs_create_out;
			pCifsFile->netfid = fileHandle;
			pCifsFile->pid = current->tgid;
			pCifsFile->pInode = newinode;
			pCifsFile->invalidHandle = false;
			pCifsFile->closePend     = false;
			init_MUTEX(&pCifsFile->fh_sem);
			mutex_init(&pCifsFile->lock_mutex);
			INIT_LIST_HEAD(&pCifsFile->llist);
			atomic_set(&pCifsFile->wrtPending, 0);

			/* set the following in open now
				pCifsFile->pfile = file; */
			write_lock(&GlobalSMBSeslock);
			list_add(&pCifsFile->tlist, &pTcon->openFileList);
			pCifsInode = CIFS_I(newinode);
			if (pCifsInode) {
				/* if readable file instance put first in list*/
				if (write_only) {
					list_add_tail(&pCifsFile->flist,
						&pCifsInode->openFileList);
				} else {
					list_add(&pCifsFile->flist,
						&pCifsInode->openFileList);
				}
				if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
					pCifsInode->clientCanCacheAll = true;
					pCifsInode->clientCanCacheRead = true;
					cFYI(1, ("Exclusive Oplock inode %p",
						newinode));
				} else if ((oplock & 0xF) == OPLOCK_READ)
					pCifsInode->clientCanCacheRead = true;
			}
			write_unlock(&GlobalSMBSeslock);
		}
	}
cifs_create_out:
	kfree(buf);
	kfree(full_path);
	FreeXid(xid);
	return rc;
}

int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
		dev_t device_number)
{
	int rc = -EPERM;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;
	struct inode *newinode = NULL;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	xid = GetXid();

	cifs_sb = CIFS_SB(inode->i_sb);
	pTcon = cifs_sb->tcon;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL)
		rc = -ENOMEM;
	else if (pTcon->unix_ext) {
		struct cifs_unix_set_info_args args = {
			.mode	= mode & ~current->fs->umask,
			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= device_number,
		};
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current->fsuid;
			args.gid = (__u64) current->fsgid;
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path,
			&args, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags &
				CIFS_MOUNT_MAP_SPECIAL_CHR);

		if (!rc) {
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);
			if (pTcon->nocase)
				direntry->d_op = &cifs_ci_dentry_ops;
			else
				direntry->d_op = &cifs_dentry_ops;
			if (rc == 0)
				d_instantiate(direntry, newinode);
		}
	} else {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
			int oplock = 0;
			u16 fileHandle;
			FILE_ALL_INFO *buf;

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

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

			rc = CIFSSMBOpen(xid, pTcon, full_path,
					 FILE_CREATE, /* fail if exists */
					 GENERIC_WRITE /* BB would
					  WRITE_OWNER | WRITE_DAC be better? */,
					 /* Create a file and set the
					    file attribute to SYSTEM */
					 CREATE_NOT_DIR | CREATE_OPTION_SPECIAL,
					 &fileHandle, &oplock, buf,
					 cifs_sb->local_nls,
					 cifs_sb->mnt_cifs_flags &
					    CIFS_MOUNT_MAP_SPECIAL_CHR);

			/* BB FIXME - add handling for backlevel servers
			   which need legacy open and check for all
			   calls to SMBOpen for fallback to SMBLeagcyOpen */
			if (!rc) {
				/* BB Do not bother to decode buf since no
				   local inode yet to put timestamps in,
				   but we can reuse it safely */
				unsigned int bytes_written;
				struct win_dev *pdev;
				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);
			}
			kfree(buf);
			/* add code here to set EAs */
		}
	}

	kfree(full_path);
	FreeXid(xid);
	return rc;
}


struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = GetXid();

	cFYI(1, (" parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry));

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	pTcon = cifs_sb->tcon;

	/*
	 * 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] == '\\') {
				cFYI(1, ("Invalid file name"));
				FreeXid(xid);
				return ERR_PTR(-EINVAL);
			}
	}

	/* 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);
	if (full_path == NULL) {
		FreeXid(xid);
		return ERR_PTR(-ENOMEM);
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, (" non-NULL inode in lookup"));
	} else {
		cFYI(1, (" NULL inode in lookup"));
	}
	cFYI(1,
	     (" Full path: %s inode = 0x%p", full_path, direntry->d_inode));

	if (pTcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newInode, full_path,
					      parent_dir_inode->i_sb, xid);
	else
		rc = cifs_get_inode_info(&newInode, full_path, NULL,
					 parent_dir_inode->i_sb, xid, NULL);

	if ((rc == 0) && (newInode != NULL)) {
		if (pTcon->nocase)
			direntry->d_op = &cifs_ci_dentry_ops;
		else
			direntry->d_op = &cifs_dentry_ops;
		d_add(direntry, newInode);

		/* since paths are not looked up by component - the parent
		   directories are presumed to be good here */
		renew_parental_timestamps(direntry);

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

	kfree(full_path);
	FreeXid(xid);
	return ERR_PTR(rc);
}

static int
cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
{
	int isValid = 1;

	if (direntry->d_inode) {
		if (cifs_revalidate(direntry))
			return 0;
	} else {
		cFYI(1, ("neg dentry 0x%p name = %s",
			 direntry, direntry->d_name.name));
		if (time_after(jiffies, direntry->d_time + HZ) ||
			!lookupCacheEnabled) {
			d_drop(direntry);
			isValid = 0;
		}
	}

	return isValid;
}

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

	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));

	return rc;
}     */

struct dentry_operations cifs_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
/* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
};

static int cifs_ci_hash(struct dentry *dentry, struct qstr *q)
{
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	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;
}

static int cifs_ci_compare(struct dentry *dentry, struct qstr *a,
			   struct qstr *b)
{
	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;

	if ((a->len == b->len) &&
	    (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
		/*
		 * To preserve case, don't let an existing negative dentry's
		 * case take precedence.  If a is not a negative dentry, this
		 * should have no side effects
		 */
		memcpy((void *)a->name, b->name, a->len);
		return 0;
	}
	return 1;
}

struct dentry_operations cifs_ci_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
	.d_hash = cifs_ci_hash,
	.d_compare = cifs_ci_compare,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/dir.c
	3	*
	4	* vfs operations that deal with dentries
5fdae1f6	5	*
ad7a2926	6	* Copyright (C) International Business Machines Corp., 2002,2008
1da177e4 LT	7	* Author(s): Steve French (sfrench@us.ibm.com)
	8	*
	9	* This library is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU Lesser General Public License as published
	11	* by the Free Software Foundation; either version 2.1 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	17	* the GNU Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public License
	20	* along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*/
	23	#include <linux/fs.h>
	24	#include <linux/stat.h>
	25	#include <linux/slab.h>
	26	#include <linux/namei.h>
	27	#include "cifsfs.h"
	28	#include "cifspdu.h"
	29	#include "cifsglob.h"
	30	#include "cifsproto.h"
	31	#include "cifs_debug.h"
	32	#include "cifs_fs_sb.h"
	33
99ee4dbd	34	static void
1da177e4 LT	35	renew_parental_timestamps(struct dentry *direntry)
1da177e4 LT	36	{
5fdae1f6 SF	37	/* BB check if there is a way to get the kernel to do this or if we
5fdae1f6 SF	38	really need this */
1da177e4 LT	39	do {
	40	direntry->d_time = jiffies;
	41	direntry = direntry->d_parent;
5fdae1f6	42	} while (!IS_ROOT(direntry));
1da177e4 LT	43	}
	44
	45	/* Note: caller must free return buffer */
	46	char *
	47	build_path_from_dentry(struct dentry *direntry)
	48	{
	49	struct dentry *temp;
2fe87f02 SF	50	int namelen;
2fe87f02 SF	51	int pplen;
646dd539	52	int dfsplen;
1da177e4	53	char *full_path;
88274815	54	char dirsep;
646dd539	55	struct cifs_sb_info *cifs_sb;
1da177e4	56
5fdae1f6	57	if (direntry == NULL)
1da177e4 LT	58	return NULL; /* not much we can do if dentry is freed and
	59	we need to reopen the file after it was closed implicitly
	60	when the server crashed */
	61
646dd539 SF	62	cifs_sb = CIFS_SB(direntry->d_sb);
	63	dirsep = CIFS_DIR_SEP(cifs_sb);
	64	pplen = cifs_sb->prepathlen;
	65	if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS))
	66	dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1);
	67	else
	68	dfsplen = 0;
1da177e4	69	cifs_bp_rename_retry:
646dd539	70	namelen = pplen + dfsplen;
1da177e4 LT	71	for (temp = direntry; !IS_ROOT(temp);) {
	72	namelen += (1 + temp->d_name.len);
	73	temp = temp->d_parent;
5fdae1f6 SF	74	if (temp == NULL) {
5fdae1f6 SF	75	cERROR(1, ("corrupt dentry"));
1da177e4 LT	76	return NULL;
	77	}
	78	}
	79
	80	full_path = kmalloc(namelen+1, GFP_KERNEL);
5fdae1f6	81	if (full_path == NULL)
1da177e4 LT	82	return full_path;
1da177e4 LT	83	full_path[namelen] = 0; /* trailing null */
1da177e4 LT	84	for (temp = direntry; !IS_ROOT(temp);) {
	85	namelen -= 1 + temp->d_name.len;
	86	if (namelen < 0) {
	87	break;
	88	} else {
7f57356b	89	full_path[namelen] = dirsep;
1da177e4 LT	90	strncpy(full_path + namelen + 1, temp->d_name.name,
1da177e4 LT	91	temp->d_name.len);
2fe87f02	92	cFYI(0, ("name: %s", full_path + namelen));
1da177e4 LT	93	}
1da177e4 LT	94	temp = temp->d_parent;
5fdae1f6 SF	95	if (temp == NULL) {
5fdae1f6 SF	96	cERROR(1, ("corrupt dentry"));
1da177e4 LT	97	kfree(full_path);
	98	return NULL;
	99	}
	100	}
646dd539	101	if (namelen != pplen + dfsplen) {
1da177e4	102	cERROR(1,
2fe87f02	103	("did not end path lookup where expected namelen is %d",
1da177e4	104	namelen));
5fdae1f6	105	/* presumably this is only possible if racing with a rename
1da177e4 LT	106	of one of the parent directories (we can not lock the dentries
	107	above us to prevent this, but retrying should be harmless) */
	108	kfree(full_path);
1da177e4 LT	109	goto cifs_bp_rename_retry;
1da177e4 LT	110	}
2fe87f02 SF	111	/* DIR_SEP already set for byte 0 / vs \ but not for
	112	subsequent slashes in prepath which currently must
	113	be entered the right way - not sure if there is an alternative
	114	since the '\' is a valid posix character so we can not switch
	115	those safely to '/' if any are found in the middle of the prepath */
	116	/* BB test paths to Windows with '/' in the midst of prepath */
646dd539 SF	117
	118	if (dfsplen) {
	119	strncpy(full_path, cifs_sb->tcon->treeName, dfsplen);
	120	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
	121	int i;
	122	for (i = 0; i < dfsplen; i++) {
	123	if (full_path[i] == '\\')
	124	full_path[i] = '/';
	125	}
	126	}
	127	}
	128	strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen);
1da177e4 LT	129	return full_path;
	130	}
	131
3979877e	132	/* Inode operations in similar order to how they appear in Linux file fs.h */
1da177e4 LT	133
	134	int
	135	cifs_create(struct inode inode, struct dentry direntry, int mode,
	136	struct nameidata *nd)
	137	{
	138	int rc = -ENOENT;
	139	int xid;
67750fb9	140	int create_options = CREATE_NOT_DIR;
1da177e4 LT	141	int oplock = 0;
	142	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	143	__u16 fileHandle;
	144	struct cifs_sb_info *cifs_sb;
	145	struct cifsTconInfo *pTcon;
	146	char *full_path = NULL;
fb8c4b14	147	FILE_ALL_INFO *buf = NULL;
1da177e4	148	struct inode *newinode = NULL;
fb8c4b14 SF	149	struct cifsFileInfo *pCifsFile = NULL;
fb8c4b14 SF	150	struct cifsInodeInfo *pCifsInode;
1da177e4	151	int disposition = FILE_OVERWRITE_IF;
4b18f2a9	152	bool write_only = false;
1da177e4 LT	153
	154	xid = GetXid();
	155
	156	cifs_sb = CIFS_SB(inode->i_sb);
	157	pTcon = cifs_sb->tcon;
	158
1da177e4	159	full_path = build_path_from_dentry(direntry);
5fdae1f6	160	if (full_path == NULL) {
1da177e4 LT	161	FreeXid(xid);
	162	return -ENOMEM;
	163	}
	164
5fdae1f6	165	if (nd && (nd->flags & LOOKUP_OPEN)) {
e08fc045 MS	166	int oflags = nd->intent.open.flags;
	167
	168	desiredAccess = 0;
	169	if (oflags & FMODE_READ)
	170	desiredAccess \|= GENERIC_READ;
	171	if (oflags & FMODE_WRITE) {
	172	desiredAccess \|= GENERIC_WRITE;
	173	if (!(oflags & FMODE_READ))
4b18f2a9	174	write_only = true;
1da177e4 LT	175	}
1da177e4 LT	176
5fdae1f6	177	if ((oflags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
1da177e4	178	disposition = FILE_CREATE;
5fdae1f6	179	else if ((oflags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
1da177e4	180	disposition = FILE_OVERWRITE_IF;
5fdae1f6	181	else if ((oflags & O_CREAT) == O_CREAT)
1da177e4	182	disposition = FILE_OPEN_IF;
ad7a2926	183	else
5fdae1f6	184	cFYI(1, ("Create flag not set in create function"));
1da177e4 LT	185	}
1da177e4 LT	186
5fdae1f6 SF	187	/* BB add processing to set equivalent of mode - e.g. via CreateX with
5fdae1f6 SF	188	ACLs */
1da177e4 LT	189	if (oplockEnabled)
	190	oplock = REQ_OPLOCK;
	191
5fdae1f6 SF	192	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5fdae1f6 SF	193	if (buf == NULL) {
1da177e4 LT	194	kfree(full_path);
	195	FreeXid(xid);
	196	return -ENOMEM;
	197	}
67750fb9 JL	198
	199	mode &= ~current->fs->umask;
	200
	201	/*
	202	* if we're not using unix extensions, see if we need to set
	203	* ATTR_READONLY on the create call
	204	*/
	205	if (!pTcon->unix_ext && (mode & S_IWUGO) == 0)
	206	create_options \|= CREATE_OPTION_READONLY;
	207
5fdae1f6	208	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
5bafd765	209	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
67750fb9	210	desiredAccess, create_options,
737b758c SF	211	&fileHandle, &oplock, buf, cifs_sb->local_nls,
737b758c SF	212	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5bafd765 SF	213	else
	214	rc = -EIO; /* no NT SMB support fall into legacy open below */
	215
5fdae1f6	216	if (rc == -EIO) {
a9d02ad4 SF	217	/* old server, retry the open legacy style */
a9d02ad4 SF	218	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
67750fb9	219	desiredAccess, create_options,
a9d02ad4 SF	220	&fileHandle, &oplock, buf, cifs_sb->local_nls,
a9d02ad4 SF	221	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5fdae1f6	222	}
1da177e4	223	if (rc) {
26a21b98	224	cFYI(1, ("cifs_create returned 0x%x", rc));
1da177e4 LT	225	} else {
	226	/* If Open reported that we actually created a file
	227	then we now have to set the mode if possible */
c18c842b	228	if ((pTcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
4e1e7fb9 JL	229	struct cifs_unix_set_info_args args = {
	230	.mode = mode,
	231	.ctime = NO_CHANGE_64,
	232	.atime = NO_CHANGE_64,
	233	.mtime = NO_CHANGE_64,
	234	.device = 0,
	235	};
	236
5fdae1f6	237	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
4e1e7fb9 JL	238	args.uid = (__u64) current->fsuid;
4e1e7fb9 JL	239	args.gid = (__u64) current->fsgid;
1da177e4	240	} else {
4e1e7fb9 JL	241	args.uid = NO_CHANGE_64;
4e1e7fb9 JL	242	args.gid = NO_CHANGE_64;
1da177e4	243	}
4e1e7fb9 JL	244
	245	CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
	246	cifs_sb->local_nls,
	247	cifs_sb->mnt_cifs_flags &
	248	CIFS_MOUNT_MAP_SPECIAL_CHR);
3ce53fc4	249	} else {
5fdae1f6 SF	250	/* BB implement mode setting via Windows security
	251	descriptors e.g. */
	252	/* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/
	253
	254	/* Could set r/o dos attribute if mode & 0222 == 0 */
1da177e4 LT	255	}
1da177e4 LT	256
c18c842b SF	257	/* server might mask mode so we have to query for it */
c18c842b SF	258	if (pTcon->unix_ext)
1da177e4	259	rc = cifs_get_inode_info_unix(&newinode, full_path,
5fdae1f6	260	inode->i_sb, xid);
1da177e4 LT	261	else {
1da177e4 LT	262	rc = cifs_get_inode_info(&newinode, full_path,
8b1327f6 SF	263	buf, inode->i_sb, xid,
8b1327f6 SF	264	&fileHandle);
5fdae1f6	265	if (newinode) {
b0fd30d3 JL	266	if (cifs_sb->mnt_cifs_flags &
	267	CIFS_MOUNT_DYNPERM)
	268	newinode->i_mode = mode;
5fdae1f6 SF	269	if ((oplock & CIFS_CREATE_ACTION) &&
5fdae1f6 SF	270	(cifs_sb->mnt_cifs_flags &
6473a559 SF	271	CIFS_MOUNT_SET_UID)) {
	272	newinode->i_uid = current->fsuid;
	273	newinode->i_gid = current->fsgid;
	274	}
	275	}
1da177e4 LT	276	}
	277
	278	if (rc != 0) {
4a6d87f1 SF	279	cFYI(1,
4a6d87f1 SF	280	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	281	rc));
1da177e4 LT	282	} else {
b92327fe SF	283	if (pTcon->nocase)
	284	direntry->d_op = &cifs_ci_dentry_ops;
	285	else
	286	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	287	d_instantiate(direntry, newinode);
1da177e4 LT	288	}
7521a3c5	289	if ((nd == NULL /* nfsd case - nfs srv does not set nd */) \|\|
4b18f2a9	290	(!(nd->flags & LOOKUP_OPEN))) {
1da177e4 LT	291	/* mknod case - do not leave file open */
1da177e4 LT	292	CIFSSMBClose(xid, pTcon, fileHandle);
5fdae1f6	293	} else if (newinode) {
d14537f1	294	pCifsFile =
92ad9b93	295	kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
221601c3	296
5fdae1f6	297	if (pCifsFile == NULL)
d14537f1	298	goto cifs_create_out;
d14537f1 SF	299	pCifsFile->netfid = fileHandle;
	300	pCifsFile->pid = current->tgid;
	301	pCifsFile->pInode = newinode;
4b18f2a9 SF	302	pCifsFile->invalidHandle = false;
4b18f2a9 SF	303	pCifsFile->closePend = false;
d14537f1	304	init_MUTEX(&pCifsFile->fh_sem);
796e5661	305	mutex_init(&pCifsFile->lock_mutex);
e466e487	306	INIT_LIST_HEAD(&pCifsFile->llist);
5fdae1f6	307	atomic_set(&pCifsFile->wrtPending, 0);
e466e487	308
5fdae1f6	309	/* set the following in open now
d14537f1 SF	310	pCifsFile->pfile = file; */
d14537f1 SF	311	write_lock(&GlobalSMBSeslock);
5fdae1f6	312	list_add(&pCifsFile->tlist, &pTcon->openFileList);
d14537f1	313	pCifsInode = CIFS_I(newinode);
5fdae1f6	314	if (pCifsInode) {
1da177e4	315	/* if readable file instance put first in list*/
4b18f2a9	316	if (write_only) {
5fdae1f6	317	list_add_tail(&pCifsFile->flist,
d14537f1 SF	318	&pCifsInode->openFileList);
	319	} else {
	320	list_add(&pCifsFile->flist,
	321	&pCifsInode->openFileList);
1da177e4	322	}
5fdae1f6	323	if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
4b18f2a9 SF	324	pCifsInode->clientCanCacheAll = true;
4b18f2a9 SF	325	pCifsInode->clientCanCacheRead = true;
221601c3	326	cFYI(1, ("Exclusive Oplock inode %p",
d14537f1	327	newinode));
5fdae1f6	328	} else if ((oplock & 0xF) == OPLOCK_READ)
4b18f2a9	329	pCifsInode->clientCanCacheRead = true;
1da177e4	330	}
d14537f1	331	write_unlock(&GlobalSMBSeslock);
1da177e4	332	}
5fdae1f6	333	}
d14537f1 SF	334	cifs_create_out:
	335	kfree(buf);
	336	kfree(full_path);
1da177e4	337	FreeXid(xid);
1da177e4 LT	338	return rc;
	339	}
	340
5fdae1f6 SF	341	int cifs_mknod(struct inode inode, struct dentry direntry, int mode,
5fdae1f6 SF	342	dev_t device_number)
1da177e4 LT	343	{
	344	int rc = -EPERM;
	345	int xid;
	346	struct cifs_sb_info *cifs_sb;
	347	struct cifsTconInfo *pTcon;
	348	char *full_path = NULL;
fb8c4b14	349	struct inode *newinode = NULL;
1da177e4 LT	350
	351	if (!old_valid_dev(device_number))
	352	return -EINVAL;
	353
	354	xid = GetXid();
	355
	356	cifs_sb = CIFS_SB(inode->i_sb);
	357	pTcon = cifs_sb->tcon;
	358
1da177e4	359	full_path = build_path_from_dentry(direntry);
5fdae1f6	360	if (full_path == NULL)
1da177e4	361	rc = -ENOMEM;
c18c842b	362	else if (pTcon->unix_ext) {
4e1e7fb9 JL	363	struct cifs_unix_set_info_args args = {
	364	.mode = mode & ~current->fs->umask,
	365	.ctime = NO_CHANGE_64,
	366	.atime = NO_CHANGE_64,
	367	.mtime = NO_CHANGE_64,
	368	.device = device_number,
	369	};
5fdae1f6	370	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
4e1e7fb9 JL	371	args.uid = (__u64) current->fsuid;
4e1e7fb9 JL	372	args.gid = (__u64) current->fsgid;
1da177e4	373	} else {
4e1e7fb9 JL	374	args.uid = NO_CHANGE_64;
4e1e7fb9 JL	375	args.gid = NO_CHANGE_64;
1da177e4	376	}
4e1e7fb9 JL	377	rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path,
	378	&args, cifs_sb->local_nls,
	379	cifs_sb->mnt_cifs_flags &
	380	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4	381
5fdae1f6	382	if (!rc) {
1da177e4	383	rc = cifs_get_inode_info_unix(&newinode, full_path,
5fdae1f6	384	inode->i_sb, xid);
b92327fe SF	385	if (pTcon->nocase)
	386	direntry->d_op = &cifs_ci_dentry_ops;
	387	else
	388	direntry->d_op = &cifs_dentry_ops;
5fdae1f6	389	if (rc == 0)
1da177e4 LT	390	d_instantiate(direntry, newinode);
1da177e4 LT	391	}
d7245c2c	392	} else {
5fdae1f6	393	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
eda3c029 SF	394	int oplock = 0;
eda3c029 SF	395	u16 fileHandle;
ad7a2926	396	FILE_ALL_INFO *buf;
d7245c2c	397
5fdae1f6	398	cFYI(1, ("sfu compat create special file"));
d7245c2c	399
5fdae1f6 SF	400	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5fdae1f6 SF	401	if (buf == NULL) {
eda3c029 SF	402	kfree(full_path);
	403	FreeXid(xid);
	404	return -ENOMEM;
	405	}
	406
	407	rc = CIFSSMBOpen(xid, pTcon, full_path,
	408	FILE_CREATE, /* fail if exists */
5fdae1f6	409	GENERIC_WRITE /* BB would
eda3c029 SF	410	WRITE_OWNER \| WRITE_DAC be better? */,
	411	/* Create a file and set the
	412	file attribute to SYSTEM */
	413	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	414	&fileHandle, &oplock, buf,
	415	cifs_sb->local_nls,
5fdae1f6	416	cifs_sb->mnt_cifs_flags &
eda3c029 SF	417	CIFS_MOUNT_MAP_SPECIAL_CHR);
eda3c029 SF	418
5bafd765 SF	419	/* BB FIXME - add handling for backlevel servers
5bafd765 SF	420	which need legacy open and check for all
5fdae1f6 SF	421	calls to SMBOpen for fallback to SMBLeagcyOpen */
5fdae1f6 SF	422	if (!rc) {
eda3c029	423	/* BB Do not bother to decode buf since no
86c96b4b SF	424	local inode yet to put timestamps in,
86c96b4b SF	425	but we can reuse it safely */
77159b4d	426	unsigned int bytes_written;
86c96b4b SF	427	struct win_dev *pdev;
86c96b4b SF	428	pdev = (struct win_dev *)buf;
5fdae1f6	429	if (S_ISCHR(mode)) {
86c96b4b SF	430	memcpy(pdev->type, "IntxCHR", 8);
	431	pdev->major =
	432	cpu_to_le64(MAJOR(device_number));
5fdae1f6	433	pdev->minor =
86c96b4b SF	434	cpu_to_le64(MINOR(device_number));
	435	rc = CIFSSMBWrite(xid, pTcon,
	436	fileHandle,
	437	sizeof(struct win_dev),
	438	0, &bytes_written, (char *)pdev,
	439	NULL, 0);
5fdae1f6	440	} else if (S_ISBLK(mode)) {
86c96b4b SF	441	memcpy(pdev->type, "IntxBLK", 8);
	442	pdev->major =
	443	cpu_to_le64(MAJOR(device_number));
	444	pdev->minor =
	445	cpu_to_le64(MINOR(device_number));
	446	rc = CIFSSMBWrite(xid, pTcon,
	447	fileHandle,
	448	sizeof(struct win_dev),
	449	0, &bytes_written, (char *)pdev,
	450	NULL, 0);
	451	} /* else if(S_ISFIFO */
eda3c029 SF	452	CIFSSMBClose(xid, pTcon, fileHandle);
	453	d_drop(direntry);
	454	}
	455	kfree(buf);
d7245c2c SF	456	/* add code here to set EAs */
d7245c2c SF	457	}
1da177e4 LT	458	}
1da177e4 LT	459
d14537f1	460	kfree(full_path);
1da177e4	461	FreeXid(xid);
1da177e4 LT	462	return rc;
	463	}
	464
	465
	466	struct dentry *
5fdae1f6 SF	467	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry,
5fdae1f6 SF	468	struct nameidata *nd)
1da177e4 LT	469	{
	470	int xid;
	471	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	472	struct cifs_sb_info *cifs_sb;
	473	struct cifsTconInfo *pTcon;
	474	struct inode *newInode = NULL;
	475	char *full_path = NULL;
	476
	477	xid = GetXid();
	478
92ad9b93	479	cFYI(1, (" parent inode = 0x%p name is: %s and dentry = 0x%p",
1da177e4 LT	480	parent_dir_inode, direntry->d_name.name, direntry));
1da177e4 LT	481
1da177e4 LT	482	/* check whether path exists */
	483
	484	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	485	pTcon = cifs_sb->tcon;
	486
296034f7 SF	487	/*
	488	* Don't allow the separator character in a path component.
	489	* The VFS will not allow "/", but "\" is allowed by posix.
	490	*/
	491	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
	492	int i;
	493	for (i = 0; i < direntry->d_name.len; i++)
	494	if (direntry->d_name.name[i] == '\\') {
	495	cFYI(1, ("Invalid file name"));
	496	FreeXid(xid);
	497	return ERR_PTR(-EINVAL);
	498	}
	499	}
	500
1da177e4 LT	501	/* can not grab the rename sem here since it would
	502	deadlock in the cases (beginning of sys_rename itself)
	503	in which we already have the sb rename sem */
	504	full_path = build_path_from_dentry(direntry);
5fdae1f6	505	if (full_path == NULL) {
1da177e4 LT	506	FreeXid(xid);
	507	return ERR_PTR(-ENOMEM);
	508	}
	509
	510	if (direntry->d_inode != NULL) {
	511	cFYI(1, (" non-NULL inode in lookup"));
	512	} else {
	513	cFYI(1, (" NULL inode in lookup"));
	514	}
	515	cFYI(1,
	516	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	517
c18c842b	518	if (pTcon->unix_ext)
1da177e4	519	rc = cifs_get_inode_info_unix(&newInode, full_path,
5fdae1f6	520	parent_dir_inode->i_sb, xid);
1da177e4 LT	521	else
1da177e4 LT	522	rc = cifs_get_inode_info(&newInode, full_path, NULL,
8b1327f6	523	parent_dir_inode->i_sb, xid, NULL);
1da177e4 LT	524
1da177e4 LT	525	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	526	if (pTcon->nocase)
	527	direntry->d_op = &cifs_ci_dentry_ops;
	528	else
	529	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	530	d_add(direntry, newInode);
1da177e4 LT	531
5fdae1f6	532	/* since paths are not looked up by component - the parent
3abb9272	533	directories are presumed to be good here */
1da177e4 LT	534	renew_parental_timestamps(direntry);
	535
	536	} else if (rc == -ENOENT) {
	537	rc = 0;
3abb9272 SF	538	direntry->d_time = jiffies;
	539	if (pTcon->nocase)
	540	direntry->d_op = &cifs_ci_dentry_ops;
	541	else
	542	direntry->d_op = &cifs_dentry_ops;
1da177e4	543	d_add(direntry, NULL);
5fdae1f6 SF	544	/* if it was once a directory (but how can we tell?) we could do
5fdae1f6 SF	545	shrink_dcache_parent(direntry); */
ed2b9170 SF	546	} else if (rc != -EACCES) {
	547	cERROR(1, ("Unexpected lookup error %d", rc));
	548	/* We special case check for Access Denied - since that
	549	is a common return code */
1da177e4 LT	550	}
1da177e4 LT	551
d14537f1	552	kfree(full_path);
1da177e4 LT	553	FreeXid(xid);
	554	return ERR_PTR(rc);
	555	}
	556
1da177e4 LT	557	static int
	558	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	559	{
	560	int isValid = 1;
	561
1da177e4	562	if (direntry->d_inode) {
ad7a2926	563	if (cifs_revalidate(direntry))
1da177e4	564	return 0;
1da177e4	565	} else {
3abb9272 SF	566	cFYI(1, ("neg dentry 0x%p name = %s",
3abb9272 SF	567	direntry, direntry->d_name.name));
5fdae1f6	568	if (time_after(jiffies, direntry->d_time + HZ) \|\|
3abb9272 SF	569	!lookupCacheEnabled) {
	570	d_drop(direntry);
	571	isValid = 0;
5fdae1f6	572	}
1da177e4 LT	573	}
1da177e4 LT	574
1da177e4 LT	575	return isValid;
	576	}
	577
	578	/* static int cifs_d_delete(struct dentry *direntry)
	579	{
	580	int rc = 0;
	581
	582	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	583
	584	return rc;
	585	} */
	586
	587	struct dentry_operations cifs_dentry_ops = {
	588	.d_revalidate = cifs_d_revalidate,
5fdae1f6	589	/* d_delete: cifs_d_delete, / / not needed except for debugging */
1da177e4	590	};
b92327fe SF	591
	592	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	593	{
	594	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	595	unsigned long hash;
	596	int i;
	597
	598	hash = init_name_hash();
	599	for (i = 0; i < q->len; i++)
	600	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	601	hash);
	602	q->hash = end_name_hash(hash);
	603
	604	return 0;
	605	}
	606
	607	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	608	struct qstr *b)
	609	{
	610	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	611
	612	if ((a->len == b->len) &&
	613	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	614	/*
	615	* To preserve case, don't let an existing negative dentry's
	616	* case take precedence. If a is not a negative dentry, this
	617	* should have no side effects
	618	*/
c3291637	619	memcpy((void *)a->name, b->name, a->len);
b92327fe SF	620	return 0;
	621	}
	622	return 1;
	623	}
	624
	625	struct dentry_operations cifs_ci_dentry_ops = {
	626	.d_revalidate = cifs_d_revalidate,
	627	.d_hash = cifs_ci_hash,
	628	.d_compare = cifs_ci_compare,
	629	};