[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., 2002,2003
 *   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"

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, const struct cifs_sb_info *cifs_sb)
{
	struct dentry *temp;
	int namelen = 0;
	char *full_path;

	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_bp_rename_retry:
	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] = CIFS_DIR_SEP(cifs_sb);
			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 != 0) {
		cERROR(1,
		       ("We did not end path lookup where we expected namelen is %d",
			namelen));
		/* presumably this is only possible if we were 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);
		namelen = 0;
		goto cifs_bp_rename_retry;
	}

	return full_path;
}

/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
{
	if(full_path == NULL)
		return full_path;

	full_path[namelen] = '\\';
	full_path[namelen+1] = '*';
	full_path[namelen+2] = 0;
BB remove above eight lines BB */

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

int
cifs_create(struct inode *inode, struct dentry *direntry, int mode,
		struct nameidata *nd)
{
	int rc = -ENOENT;
	int xid;
	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;
	int write_only = FALSE;

	xid = GetXid();

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

	down(&direntry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry, cifs_sb);
	up(&direntry->d_sb->s_vfs_rename_sem);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}

	if(nd) {
		if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
			desiredAccess = GENERIC_READ;
		else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
			desiredAccess = GENERIC_WRITE;
			write_only = TRUE;
		} else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
			/* GENERIC_ALL is too much permission to request */
			/* can cause unnecessary access denied on create */
			/* desiredAccess = GENERIC_ALL; */
			desiredAccess = GENERIC_READ | GENERIC_WRITE;
		}

		if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
			disposition = FILE_CREATE;
		else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
			disposition = FILE_OVERWRITE_IF;
		else if((nd->intent.open.flags & 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;
	}

	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
			 desiredAccess, CREATE_NOT_DIR,
			 &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 ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
			(oplock & CIFS_CREATE_ACTION))
			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)current->euid,
					(__u64)current->egid,
					0 /* dev */,
					cifs_sb->local_nls, 
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			} else {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)-1,
					(__u64)-1,
					0 /* dev */,
					cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			}
		else {
			/* BB implement mode setting via Windows security descriptors */
			/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
			/* could set r/o dos attribute if mode & 0222 == 0 */
		}

	/* BB server might mask mode so we have to query for Unix case*/
		if (pTcon->ses->capabilities & CAP_UNIX)
			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);
			if(newinode)
				newinode->i_mode = mode;
		}

		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->flags & LOOKUP_OPEN) == FALSE) {
			/* mknod case - do not leave file open */
			CIFSSMBClose(xid, pTcon, fileHandle);
		} else if(newinode) {
			pCifsFile =
			   kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
			
			if(pCifsFile == NULL)
				goto cifs_create_out;
			memset((char *)pCifsFile, 0,
			       sizeof (struct cifsFileInfo));
			pCifsFile->netfid = fileHandle;
			pCifsFile->pid = current->tgid;
			pCifsFile->pInode = newinode;
			pCifsFile->invalidHandle = FALSE;
			pCifsFile->closePend     = FALSE;
			init_MUTEX(&pCifsFile->fh_sem);
			/* 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 == TRUE) {
                                       	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 for 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;

	down(&direntry->d_sb->s_vfs_rename_sem);
	full_path = build_path_from_dentry(direntry, cifs_sb);
	up(&direntry->d_sb->s_vfs_rename_sem);
	if(full_path == NULL)
		rc = -ENOMEM;
	else if (pTcon->ses->capabilities & CAP_UNIX) {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
				mode,(__u64)current->euid,(__u64)current->egid,
				device_number, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
		} else {
			rc = CIFSSMBUnixSetPerms(xid, pTcon,
				full_path, mode, (__u64)-1, (__u64)-1,
				device_number, 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);

			if(!rc) {
				/* BB Do not bother to decode buf since no
				   local inode yet to put timestamps in */
				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));

	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */

	/* check whether path exists */

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

	/* 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, cifs_sb);
	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->ses->capabilities & CAP_UNIX)
		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);

	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;
		d_add(direntry, NULL);
	} else {
		cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
			   rc,full_path));
		/* BB special case check for Access Denied - watch security 
		exposure of returning dir info implicitly via different rc 
		if file exists or not but no access BB */
	}

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

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

/*	lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */

	if (direntry->d_inode) {
		if (cifs_revalidate(direntry)) {
			/* unlock_kernel(); */
			return 0;
		}
	} else {
		cFYI(1,
		     ("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
		      direntry->d_name.name, direntry));
	}

/*    unlock_kernel(); */

	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 */
	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
};

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((unsigned char *)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
	5	*
	6	* Copyright (C) International Business Machines Corp., 2002,2003
	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
	34	void
	35	renew_parental_timestamps(struct dentry *direntry)
	36	{
	37	/* BB check if there is a way to get the kernel to do this or if we really need this */
	38	do {
	39	direntry->d_time = jiffies;
	40	direntry = direntry->d_parent;
	41	} while (!IS_ROOT(direntry));
	42	}
	43
	44	/* Note: caller must free return buffer */
	45	char *
ac67055e	46	build_path_from_dentry(struct dentry direntry, const struct cifs_sb_info cifs_sb)
1da177e4 LT	47	{
	48	struct dentry *temp;
	49	int namelen = 0;
	50	char *full_path;
	51
	52	if(direntry == NULL)
	53	return NULL; /* not much we can do if dentry is freed and
	54	we need to reopen the file after it was closed implicitly
	55	when the server crashed */
	56
	57	cifs_bp_rename_retry:
	58	for (temp = direntry; !IS_ROOT(temp);) {
	59	namelen += (1 + temp->d_name.len);
	60	temp = temp->d_parent;
	61	if(temp == NULL) {
	62	cERROR(1,("corrupt dentry"));
	63	return NULL;
	64	}
	65	}
	66
	67	full_path = kmalloc(namelen+1, GFP_KERNEL);
	68	if(full_path == NULL)
	69	return full_path;
	70	full_path[namelen] = 0; /* trailing null */
	71
	72	for (temp = direntry; !IS_ROOT(temp);) {
	73	namelen -= 1 + temp->d_name.len;
	74	if (namelen < 0) {
	75	break;
	76	} else {
ac67055e	77	full_path[namelen] = CIFS_DIR_SEP(cifs_sb);
1da177e4 LT	78	strncpy(full_path + namelen + 1, temp->d_name.name,
	79	temp->d_name.len);
	80	cFYI(0, (" name: %s ", full_path + namelen));
	81	}
	82	temp = temp->d_parent;
	83	if(temp == NULL) {
	84	cERROR(1,("corrupt dentry"));
	85	kfree(full_path);
	86	return NULL;
	87	}
	88	}
	89	if (namelen != 0) {
	90	cERROR(1,
	91	("We did not end path lookup where we expected namelen is %d",
	92	namelen));
	93	/* presumably this is only possible if we were racing with a rename
	94	of one of the parent directories (we can not lock the dentries
	95	above us to prevent this, but retrying should be harmless) */
	96	kfree(full_path);
	97	namelen = 0;
	98	goto cifs_bp_rename_retry;
	99	}
	100
	101	return full_path;
	102	}
	103
737b758c	104	/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
1da177e4	105	{
1da177e4 LT	106	if(full_path == NULL)
	107	return full_path;
	108
	109	full_path[namelen] = '\\';
	110	full_path[namelen+1] = '*';
737b758c SF	111	full_path[namelen+2] = 0;
737b758c SF	112	BB remove above eight lines BB */
1da177e4 LT	113
	114	/* Inode operations in similar order to how they appear in the Linux file fs.h */
	115
	116	int
	117	cifs_create(struct inode inode, struct dentry direntry, int mode,
	118	struct nameidata *nd)
	119	{
	120	int rc = -ENOENT;
	121	int xid;
	122	int oplock = 0;
	123	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	124	__u16 fileHandle;
	125	struct cifs_sb_info *cifs_sb;
	126	struct cifsTconInfo *pTcon;
	127	char *full_path = NULL;
	128	FILE_ALL_INFO * buf = NULL;
	129	struct inode *newinode = NULL;
	130	struct cifsFileInfo * pCifsFile = NULL;
	131	struct cifsInodeInfo * pCifsInode;
	132	int disposition = FILE_OVERWRITE_IF;
	133	int write_only = FALSE;
	134
	135	xid = GetXid();
	136
	137	cifs_sb = CIFS_SB(inode->i_sb);
	138	pTcon = cifs_sb->tcon;
	139
	140	down(&direntry->d_sb->s_vfs_rename_sem);
ac67055e	141	full_path = build_path_from_dentry(direntry, cifs_sb);
1da177e4 LT	142	up(&direntry->d_sb->s_vfs_rename_sem);
	143	if(full_path == NULL) {
	144	FreeXid(xid);
	145	return -ENOMEM;
	146	}
	147
	148	if(nd) {
	149	if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
	150	desiredAccess = GENERIC_READ;
	151	else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
	152	desiredAccess = GENERIC_WRITE;
	153	write_only = TRUE;
	154	} else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
	155	/* GENERIC_ALL is too much permission to request */
	156	/* can cause unnecessary access denied on create */
	157	/* desiredAccess = GENERIC_ALL; */
	158	desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	159	}
	160
	161	if((nd->intent.open.flags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
	162	disposition = FILE_CREATE;
	163	else if((nd->intent.open.flags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
	164	disposition = FILE_OVERWRITE_IF;
	165	else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
	166	disposition = FILE_OPEN_IF;
	167	else {
	168	cFYI(1,("Create flag not set in create function"));
	169	}
	170	}
	171
	172	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
	173	if (oplockEnabled)
	174	oplock = REQ_OPLOCK;
	175
	176	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	177	if(buf == NULL) {
	178	kfree(full_path);
	179	FreeXid(xid);
	180	return -ENOMEM;
	181	}
	182
	183	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
	184	desiredAccess, CREATE_NOT_DIR,
737b758c SF	185	&fileHandle, &oplock, buf, cifs_sb->local_nls,
737b758c SF	186	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	187	if (rc) {
	188	cFYI(1, ("cifs_create returned 0x%x ", rc));
	189	} else {
	190	/* If Open reported that we actually created a file
	191	then we now have to set the mode if possible */
	192	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
	193	(oplock & CIFS_CREATE_ACTION))
	194	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	195	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	196	(__u64)current->euid,
	197	(__u64)current->egid,
	198	0 /* dev */,
737b758c SF	199	cifs_sb->local_nls,
	200	cifs_sb->mnt_cifs_flags &
	201	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	202	} else {
	203	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	204	(__u64)-1,
	205	(__u64)-1,
	206	0 /* dev */,
737b758c SF	207	cifs_sb->local_nls,
	208	cifs_sb->mnt_cifs_flags &
	209	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	210	}
1da177e4 LT	211	else {
d7245c2c	212	/* BB implement mode setting via Windows security descriptors */
1da177e4 LT	213	/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
	214	/* could set r/o dos attribute if mode & 0222 == 0 */
	215	}
	216
	217	/* BB server might mask mode so we have to query for Unix case*/
	218	if (pTcon->ses->capabilities & CAP_UNIX)
	219	rc = cifs_get_inode_info_unix(&newinode, full_path,
	220	inode->i_sb,xid);
	221	else {
	222	rc = cifs_get_inode_info(&newinode, full_path,
	223	buf, inode->i_sb,xid);
	224	if(newinode)
	225	newinode->i_mode = mode;
	226	}
	227
	228	if (rc != 0) {
4a6d87f1 SF	229	cFYI(1,
4a6d87f1 SF	230	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	231	rc));
1da177e4 LT	232	} else {
b92327fe SF	233	if (pTcon->nocase)
	234	direntry->d_op = &cifs_ci_dentry_ops;
	235	else
	236	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	237	d_instantiate(direntry, newinode);
	238	}
	239	if((nd->flags & LOOKUP_OPEN) == FALSE) {
	240	/* mknod case - do not leave file open */
	241	CIFSSMBClose(xid, pTcon, fileHandle);
	242	} else if(newinode) {
d14537f1	243	pCifsFile =
1da177e4	244	kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
d14537f1 SF	245
	246	if(pCifsFile == NULL)
	247	goto cifs_create_out;
	248	memset((char *)pCifsFile, 0,
	249	sizeof (struct cifsFileInfo));
	250	pCifsFile->netfid = fileHandle;
	251	pCifsFile->pid = current->tgid;
	252	pCifsFile->pInode = newinode;
	253	pCifsFile->invalidHandle = FALSE;
	254	pCifsFile->closePend = FALSE;
	255	init_MUTEX(&pCifsFile->fh_sem);
	256	/* set the following in open now
	257	pCifsFile->pfile = file; */
	258	write_lock(&GlobalSMBSeslock);
	259	list_add(&pCifsFile->tlist,&pTcon->openFileList);
	260	pCifsInode = CIFS_I(newinode);
	261	if(pCifsInode) {
1da177e4	262	/* if readable file instance put first in list*/
d14537f1 SF	263	if (write_only == TRUE) {
	264	list_add_tail(&pCifsFile->flist,
	265	&pCifsInode->openFileList);
	266	} else {
	267	list_add(&pCifsFile->flist,
	268	&pCifsInode->openFileList);
1da177e4	269	}
d14537f1 SF	270	if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
	271	pCifsInode->clientCanCacheAll = TRUE;
	272	pCifsInode->clientCanCacheRead = TRUE;
	273	cFYI(1,("Exclusive Oplock for inode %p",
	274	newinode));
	275	} else if((oplock & 0xF) == OPLOCK_READ)
	276	pCifsInode->clientCanCacheRead = TRUE;
1da177e4	277	}
d14537f1	278	write_unlock(&GlobalSMBSeslock);
1da177e4 LT	279	}
1da177e4 LT	280	}
d14537f1 SF	281	cifs_create_out:
	282	kfree(buf);
	283	kfree(full_path);
1da177e4	284	FreeXid(xid);
1da177e4 LT	285	return rc;
	286	}
	287
	288	int cifs_mknod(struct inode inode, struct dentry direntry, int mode, dev_t device_number)
	289	{
	290	int rc = -EPERM;
	291	int xid;
	292	struct cifs_sb_info *cifs_sb;
	293	struct cifsTconInfo *pTcon;
	294	char *full_path = NULL;
	295	struct inode * newinode = NULL;
	296
	297	if (!old_valid_dev(device_number))
	298	return -EINVAL;
	299
	300	xid = GetXid();
	301
	302	cifs_sb = CIFS_SB(inode->i_sb);
	303	pTcon = cifs_sb->tcon;
	304
	305	down(&direntry->d_sb->s_vfs_rename_sem);
ac67055e	306	full_path = build_path_from_dentry(direntry, cifs_sb);
1da177e4 LT	307	up(&direntry->d_sb->s_vfs_rename_sem);
	308	if(full_path == NULL)
	309	rc = -ENOMEM;
4a6d87f1	310	else if (pTcon->ses->capabilities & CAP_UNIX) {
1da177e4 LT	311	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	312	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
	313	mode,(__u64)current->euid,(__u64)current->egid,
737b758c SF	314	device_number, cifs_sb->local_nls,
	315	cifs_sb->mnt_cifs_flags &
	316	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	317	} else {
	318	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	319	full_path, mode, (__u64)-1, (__u64)-1,
737b758c SF	320	device_number, cifs_sb->local_nls,
	321	cifs_sb->mnt_cifs_flags &
	322	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	323	}
	324
	325	if(!rc) {
	326	rc = cifs_get_inode_info_unix(&newinode, full_path,
	327	inode->i_sb,xid);
b92327fe SF	328	if (pTcon->nocase)
	329	direntry->d_op = &cifs_ci_dentry_ops;
	330	else
	331	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	332	if(rc == 0)
	333	d_instantiate(direntry, newinode);
	334	}
d7245c2c	335	} else {
eda3c029 SF	336	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
	337	int oplock = 0;
	338	u16 fileHandle;
	339	FILE_ALL_INFO * buf;
d7245c2c SF	340
d7245c2c SF	341	cFYI(1,("sfu compat create special file"));
d7245c2c	342
eda3c029 SF	343	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	344	if(buf == NULL) {
	345	kfree(full_path);
	346	FreeXid(xid);
	347	return -ENOMEM;
	348	}
	349
	350	rc = CIFSSMBOpen(xid, pTcon, full_path,
	351	FILE_CREATE, /* fail if exists */
	352	GENERIC_WRITE /* BB would
	353	WRITE_OWNER \| WRITE_DAC be better? */,
	354	/* Create a file and set the
	355	file attribute to SYSTEM */
	356	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	357	&fileHandle, &oplock, buf,
	358	cifs_sb->local_nls,
	359	cifs_sb->mnt_cifs_flags &
	360	CIFS_MOUNT_MAP_SPECIAL_CHR);
	361
	362	if(!rc) {
	363	/* BB Do not bother to decode buf since no
	364	local inode yet to put timestamps in */
	365	CIFSSMBClose(xid, pTcon, fileHandle);
	366	d_drop(direntry);
	367	}
	368	kfree(buf);
d7245c2c SF	369	/* add code here to set EAs */
d7245c2c SF	370	}
1da177e4 LT	371	}
1da177e4 LT	372
d14537f1	373	kfree(full_path);
1da177e4	374	FreeXid(xid);
1da177e4 LT	375	return rc;
	376	}
	377
	378
	379	struct dentry *
	380	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry, struct nameidata *nd)
	381	{
	382	int xid;
	383	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	384	struct cifs_sb_info *cifs_sb;
	385	struct cifsTconInfo *pTcon;
	386	struct inode *newInode = NULL;
	387	char *full_path = NULL;
	388
	389	xid = GetXid();
	390
	391	cFYI(1,
	392	(" parent inode = 0x%p name is: %s and dentry = 0x%p",
	393	parent_dir_inode, direntry->d_name.name, direntry));
	394
	395	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
	396
	397	/* check whether path exists */
	398
	399	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	400	pTcon = cifs_sb->tcon;
	401
	402	/* can not grab the rename sem here since it would
	403	deadlock in the cases (beginning of sys_rename itself)
	404	in which we already have the sb rename sem */
ac67055e	405	full_path = build_path_from_dentry(direntry, cifs_sb);
1da177e4 LT	406	if(full_path == NULL) {
	407	FreeXid(xid);
	408	return ERR_PTR(-ENOMEM);
	409	}
	410
	411	if (direntry->d_inode != NULL) {
	412	cFYI(1, (" non-NULL inode in lookup"));
	413	} else {
	414	cFYI(1, (" NULL inode in lookup"));
	415	}
	416	cFYI(1,
	417	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	418
	419	if (pTcon->ses->capabilities & CAP_UNIX)
	420	rc = cifs_get_inode_info_unix(&newInode, full_path,
	421	parent_dir_inode->i_sb,xid);
	422	else
	423	rc = cifs_get_inode_info(&newInode, full_path, NULL,
	424	parent_dir_inode->i_sb,xid);
	425
	426	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	427	if (pTcon->nocase)
	428	direntry->d_op = &cifs_ci_dentry_ops;
	429	else
	430	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	431	d_add(direntry, newInode);
	432
	433	/* since paths are not looked up by component - the parent directories are presumed to be good here */
	434	renew_parental_timestamps(direntry);
	435
	436	} else if (rc == -ENOENT) {
	437	rc = 0;
	438	d_add(direntry, NULL);
	439	} else {
b2aeb9d5 SF	440	cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
b2aeb9d5 SF	441	rc,full_path));
1da177e4 LT	442	/* BB special case check for Access Denied - watch security
	443	exposure of returning dir info implicitly via different rc
	444	if file exists or not but no access BB */
	445	}
	446
d14537f1	447	kfree(full_path);
1da177e4 LT	448	FreeXid(xid);
	449	return ERR_PTR(rc);
	450	}
	451
1da177e4 LT	452	static int
	453	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	454	{
	455	int isValid = 1;
	456
	457	/* lock_kernel(); // surely we do not want to lock the kernel for a whole network round trip which could take seconds */
	458
	459	if (direntry->d_inode) {
	460	if (cifs_revalidate(direntry)) {
	461	/* unlock_kernel(); */
	462	return 0;
	463	}
	464	} else {
	465	cFYI(1,
	466	("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
	467	direntry->d_name.name, direntry));
	468	}
	469
	470	/* unlock_kernel(); */
	471
	472	return isValid;
	473	}
	474
	475	/* static int cifs_d_delete(struct dentry *direntry)
	476	{
	477	int rc = 0;
	478
	479	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	480
	481	return rc;
	482	} */
	483
	484	struct dentry_operations cifs_dentry_ops = {
	485	.d_revalidate = cifs_d_revalidate,
	486	/* d_delete: cifs_d_delete, // not needed except for debugging */
	487	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
	488	};
b92327fe SF	489
	490	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	491	{
	492	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	493	unsigned long hash;
	494	int i;
	495
	496	hash = init_name_hash();
	497	for (i = 0; i < q->len; i++)
	498	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	499	hash);
	500	q->hash = end_name_hash(hash);
	501
	502	return 0;
	503	}
	504
	505	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	506	struct qstr *b)
	507	{
	508	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	509
	510	if ((a->len == b->len) &&
	511	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	512	/*
	513	* To preserve case, don't let an existing negative dentry's
	514	* case take precedence. If a is not a negative dentry, this
	515	* should have no side effects
	516	*/
	517	memcpy((unsigned char *)a->name, b->name, a->len);
	518	return 0;
	519	}
	520	return 1;
	521	}
	522
	523	struct dentry_operations cifs_ci_dentry_ops = {
	524	.d_revalidate = cifs_d_revalidate,
	525	.d_hash = cifs_ci_hash,
	526	.d_compare = cifs_ci_compare,
	527	};