[linux.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 ([email protected])
 *
 *   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)
{
	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] = '\\';
			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;
}

/* Note: caller must free return buffer */
char *
build_wildcard_path_from_dentry(struct dentry *direntry)
{
	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_bwp_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+3, GFP_KERNEL);
	if(full_path == NULL)
		return full_path;

	full_path[namelen] = '\\';
	full_path[namelen+1] = '*';
	full_path[namelen+2] = 0;  /* trailing null */

	for (temp = direntry; !IS_ROOT(temp);) {
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			break;
		} else {
			full_path[namelen] = '\\';
			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_bwp_rename_retry;
	}

	return full_path;
}

/* 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);
	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);
	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);
			} else {
				CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
					(__u64)-1,
					(__u64)-1,
					0 /* dev */,
					cifs_sb->local_nls);
			}
		else {
			/* BB implement 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 with rc = %d",
			      rc));
		} 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);
	up(&direntry->d_sb->s_vfs_rename_sem);
	if(full_path == NULL)
		rc = -ENOMEM;
	
	if (full_path && (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);
		} else {
			rc = CIFSSMBUnixSetPerms(xid, pTcon,
				full_path, mode, (__u64)-1, (__u64)-1,
				device_number, cifs_sb->local_nls);
		}

		if(!rc) {
			rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb,xid);
			direntry->d_op = &cifs_dentry_ops;
			if(rc == 0)
				d_instantiate(direntry, newinode);
		}
	}

	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);
	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)) {
		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 or on cifs_get_inode_info in lookup",rc));
		/* 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);
}

int
cifs_dir_open(struct inode *inode, struct file *file)
{				/* NB: currently unused since searches are opened in readdir */
	int rc = 0;
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	char *full_path = NULL;

	xid = GetXid();

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

	if(file->f_dentry) {
		down(&file->f_dentry->d_sb->s_vfs_rename_sem);
		full_path = build_wildcard_path_from_dentry(file->f_dentry);
		up(&file->f_dentry->d_sb->s_vfs_rename_sem);
	} else {
		FreeXid(xid);
		return -EIO;
	}

	cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path));

	kfree(full_path);
	FreeXid(xid);
	return 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 */
};
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 ([email protected])
	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 *
	46	build_path_from_dentry(struct dentry *direntry)
	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 {
77	full_path[namelen] = '\\';
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
104	/* Note: caller must free return buffer */
105	char *
106	build_wildcard_path_from_dentry(struct dentry *direntry)
107	{
108	struct dentry *temp;
109	int namelen = 0;
110	char *full_path;
111
112	if(direntry == NULL)
113	return NULL; /* not much we can do if dentry is freed and
114	we need to reopen the file after it was closed implicitly
115	when the server crashed */
116
117	cifs_bwp_rename_retry:
118	for (temp = direntry; !IS_ROOT(temp);) {
119	namelen += (1 + temp->d_name.len);
120	temp = temp->d_parent;
121	if(temp == NULL) {
122	cERROR(1,("corrupt dentry"));
123	return NULL;
124	}
125	}
126
127	full_path = kmalloc(namelen+3, GFP_KERNEL);
128	if(full_path == NULL)
129	return full_path;
130
131	full_path[namelen] = '\\';
132	full_path[namelen+1] = '*';
133	full_path[namelen+2] = 0; /* trailing null */
134
135	for (temp = direntry; !IS_ROOT(temp);) {
136	namelen -= 1 + temp->d_name.len;
137	if (namelen < 0) {
138	break;
139	} else {
140	full_path[namelen] = '\\';
141	strncpy(full_path + namelen + 1, temp->d_name.name,
142	temp->d_name.len);
143	cFYI(0, (" name: %s ", full_path + namelen));
144	}
145	temp = temp->d_parent;
146	if(temp == NULL) {
147	cERROR(1,("corrupt dentry"));
148	kfree(full_path);
149	return NULL;
150	}
151	}
152	if (namelen != 0) {
153	cERROR(1,
154	("We did not end path lookup where we expected namelen is %d",
155	namelen));
156	/* presumably this is only possible if we were racing with a rename
157	of one of the parent directories (we can not lock the dentries
158	above us to prevent this, but retrying should be harmless) */
159	kfree(full_path);
160	namelen = 0;
161	goto cifs_bwp_rename_retry;
162	}
163
164	return full_path;
165	}
166
167	/* Inode operations in similar order to how they appear in the Linux file fs.h */
168
169	int
170	cifs_create(struct inode inode, struct dentry direntry, int mode,
171	struct nameidata *nd)
172	{
173	int rc = -ENOENT;
174	int xid;
175	int oplock = 0;
176	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
177	__u16 fileHandle;
178	struct cifs_sb_info *cifs_sb;
179	struct cifsTconInfo *pTcon;
180	char *full_path = NULL;
181	FILE_ALL_INFO * buf = NULL;
182	struct inode *newinode = NULL;
183	struct cifsFileInfo * pCifsFile = NULL;
184	struct cifsInodeInfo * pCifsInode;
185	int disposition = FILE_OVERWRITE_IF;
186	int write_only = FALSE;
187
188	xid = GetXid();
189
190	cifs_sb = CIFS_SB(inode->i_sb);
191	pTcon = cifs_sb->tcon;
192
193	down(&direntry->d_sb->s_vfs_rename_sem);
194	full_path = build_path_from_dentry(direntry);
195	up(&direntry->d_sb->s_vfs_rename_sem);
196	if(full_path == NULL) {
197	FreeXid(xid);
198	return -ENOMEM;
199	}
200
201	if(nd) {
202	if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
203	desiredAccess = GENERIC_READ;
204	else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
205	desiredAccess = GENERIC_WRITE;
206	write_only = TRUE;
207	} else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
208	/* GENERIC_ALL is too much permission to request */
209	/* can cause unnecessary access denied on create */
210	/* desiredAccess = GENERIC_ALL; */
211	desiredAccess = GENERIC_READ \| GENERIC_WRITE;
212	}
213
214	if((nd->intent.open.flags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
215	disposition = FILE_CREATE;
216	else if((nd->intent.open.flags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
217	disposition = FILE_OVERWRITE_IF;
218	else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
219	disposition = FILE_OPEN_IF;
220	else {
221	cFYI(1,("Create flag not set in create function"));
222	}
223	}
224
225	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
226	if (oplockEnabled)
227	oplock = REQ_OPLOCK;
228
229	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
230	if(buf == NULL) {
231	kfree(full_path);
232	FreeXid(xid);
233	return -ENOMEM;
234	}
235
236	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
237	desiredAccess, CREATE_NOT_DIR,
238	&fileHandle, &oplock, buf, cifs_sb->local_nls);
239	if (rc) {
240	cFYI(1, ("cifs_create returned 0x%x ", rc));
241	} else {
242	/* If Open reported that we actually created a file
243	then we now have to set the mode if possible */
244	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
245	(oplock & CIFS_CREATE_ACTION))
246	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
247	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
248	(__u64)current->euid,
249	(__u64)current->egid,
250	0 /* dev */,
251	cifs_sb->local_nls);
252	} else {
253	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
254	(__u64)-1,
255	(__u64)-1,
256	0 /* dev */,
257	cifs_sb->local_nls);
258	}
259	else {
260	/* BB implement via Windows security descriptors */
261	/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
262	/* could set r/o dos attribute if mode & 0222 == 0 */
263	}
264
265	/* BB server might mask mode so we have to query for Unix case*/
266	if (pTcon->ses->capabilities & CAP_UNIX)
267	rc = cifs_get_inode_info_unix(&newinode, full_path,
268	inode->i_sb,xid);
269	else {
270	rc = cifs_get_inode_info(&newinode, full_path,
271	buf, inode->i_sb,xid);
272	if(newinode)
273	newinode->i_mode = mode;
274	}
275
276	if (rc != 0) {
277	cFYI(1,("Create worked but get_inode_info failed with rc = %d",
278	rc));
279	} else {
280	direntry->d_op = &cifs_dentry_ops;
281	d_instantiate(direntry, newinode);
282	}
283	if((nd->flags & LOOKUP_OPEN) == FALSE) {
284	/* mknod case - do not leave file open */
285	CIFSSMBClose(xid, pTcon, fileHandle);
286	} else if(newinode) {
d14537f1	287	pCifsFile =
1da177e4	288	kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
d14537f1 SF	289
	290	if(pCifsFile == NULL)
	291	goto cifs_create_out;
	292	memset((char *)pCifsFile, 0,
	293	sizeof (struct cifsFileInfo));
	294	pCifsFile->netfid = fileHandle;
	295	pCifsFile->pid = current->tgid;
	296	pCifsFile->pInode = newinode;
	297	pCifsFile->invalidHandle = FALSE;
	298	pCifsFile->closePend = FALSE;
	299	init_MUTEX(&pCifsFile->fh_sem);
	300	/* set the following in open now
	301	pCifsFile->pfile = file; */
	302	write_lock(&GlobalSMBSeslock);
	303	list_add(&pCifsFile->tlist,&pTcon->openFileList);
	304	pCifsInode = CIFS_I(newinode);
	305	if(pCifsInode) {
1da177e4	306	/* if readable file instance put first in list*/
d14537f1 SF	307	if (write_only == TRUE) {
	308	list_add_tail(&pCifsFile->flist,
	309	&pCifsInode->openFileList);
	310	} else {
	311	list_add(&pCifsFile->flist,
	312	&pCifsInode->openFileList);
1da177e4	313	}
d14537f1 SF	314	if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
	315	pCifsInode->clientCanCacheAll = TRUE;
	316	pCifsInode->clientCanCacheRead = TRUE;
	317	cFYI(1,("Exclusive Oplock for inode %p",
	318	newinode));
	319	} else if((oplock & 0xF) == OPLOCK_READ)
	320	pCifsInode->clientCanCacheRead = TRUE;
1da177e4	321	}
d14537f1	322	write_unlock(&GlobalSMBSeslock);
1da177e4 LT	323	}
1da177e4 LT	324	}
d14537f1 SF	325	cifs_create_out:
	326	kfree(buf);
	327	kfree(full_path);
1da177e4	328	FreeXid(xid);
1da177e4 LT	329	return rc;
	330	}
	331
	332	int cifs_mknod(struct inode inode, struct dentry direntry, int mode, dev_t device_number)
	333	{
	334	int rc = -EPERM;
	335	int xid;
	336	struct cifs_sb_info *cifs_sb;
	337	struct cifsTconInfo *pTcon;
	338	char *full_path = NULL;
	339	struct inode * newinode = NULL;
	340
	341	if (!old_valid_dev(device_number))
	342	return -EINVAL;
	343
	344	xid = GetXid();
	345
	346	cifs_sb = CIFS_SB(inode->i_sb);
	347	pTcon = cifs_sb->tcon;
	348
	349	down(&direntry->d_sb->s_vfs_rename_sem);
	350	full_path = build_path_from_dentry(direntry);
	351	up(&direntry->d_sb->s_vfs_rename_sem);
	352	if(full_path == NULL)
	353	rc = -ENOMEM;
	354
	355	if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
	356	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	357	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
	358	mode,(__u64)current->euid,(__u64)current->egid,
	359	device_number, cifs_sb->local_nls);
	360	} else {
	361	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	362	full_path, mode, (__u64)-1, (__u64)-1,
	363	device_number, cifs_sb->local_nls);
	364	}
	365
	366	if(!rc) {
	367	rc = cifs_get_inode_info_unix(&newinode, full_path,
	368	inode->i_sb,xid);
	369	direntry->d_op = &cifs_dentry_ops;
	370	if(rc == 0)
	371	d_instantiate(direntry, newinode);
	372	}
	373	}
	374
d14537f1	375	kfree(full_path);
1da177e4	376	FreeXid(xid);
1da177e4 LT	377	return rc;
	378	}
	379
	380
	381	struct dentry *
	382	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry, struct nameidata *nd)
	383	{
	384	int xid;
	385	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	386	struct cifs_sb_info *cifs_sb;
	387	struct cifsTconInfo *pTcon;
	388	struct inode *newInode = NULL;
	389	char *full_path = NULL;
	390
	391	xid = GetXid();
	392
	393	cFYI(1,
	394	(" parent inode = 0x%p name is: %s and dentry = 0x%p",
	395	parent_dir_inode, direntry->d_name.name, direntry));
	396
	397	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
	398
	399	/* check whether path exists */
	400
	401	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	402	pTcon = cifs_sb->tcon;
	403
	404	/* can not grab the rename sem here since it would
	405	deadlock in the cases (beginning of sys_rename itself)
	406	in which we already have the sb rename sem */
	407	full_path = build_path_from_dentry(direntry);
	408	if(full_path == NULL) {
	409	FreeXid(xid);
	410	return ERR_PTR(-ENOMEM);
	411	}
	412
	413	if (direntry->d_inode != NULL) {
	414	cFYI(1, (" non-NULL inode in lookup"));
	415	} else {
	416	cFYI(1, (" NULL inode in lookup"));
	417	}
	418	cFYI(1,
	419	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	420
	421	if (pTcon->ses->capabilities & CAP_UNIX)
	422	rc = cifs_get_inode_info_unix(&newInode, full_path,
	423	parent_dir_inode->i_sb,xid);
	424	else
	425	rc = cifs_get_inode_info(&newInode, full_path, NULL,
	426	parent_dir_inode->i_sb,xid);
	427
	428	if ((rc == 0) && (newInode != NULL)) {
	429	direntry->d_op = &cifs_dentry_ops;
	430	d_add(direntry, newInode);
	431
	432	/* since paths are not looked up by component - the parent directories are presumed to be good here */
	433	renew_parental_timestamps(direntry);
	434
	435	} else if (rc == -ENOENT) {
	436	rc = 0;
	437	d_add(direntry, NULL);
	438	} else {
	439	cERROR(1,("Error 0x%x or on cifs_get_inode_info in lookup",rc));
	440	/* BB special case check for Access Denied - watch security
441	exposure of returning dir info implicitly via different rc
442	if file exists or not but no access BB */
443	}
444
d14537f1	445	kfree(full_path);
1da177e4 LT	446	FreeXid(xid);
	447	return ERR_PTR(rc);
	448	}
	449
	450	int
	451	cifs_dir_open(struct inode inode, struct file file)
	452	{ /* NB: currently unused since searches are opened in readdir */
	453	int rc = 0;
	454	int xid;
	455	struct cifs_sb_info *cifs_sb;
	456	struct cifsTconInfo *pTcon;
	457	char *full_path = NULL;
	458
	459	xid = GetXid();
	460
	461	cifs_sb = CIFS_SB(inode->i_sb);
	462	pTcon = cifs_sb->tcon;
	463
	464	if(file->f_dentry) {
	465	down(&file->f_dentry->d_sb->s_vfs_rename_sem);
	466	full_path = build_wildcard_path_from_dentry(file->f_dentry);
	467	up(&file->f_dentry->d_sb->s_vfs_rename_sem);
	468	} else {
	469	FreeXid(xid);
	470	return -EIO;
	471	}
	472
	473	cFYI(1, ("inode = 0x%p and full path is %s", inode, full_path));
	474
d14537f1	475	kfree(full_path);
1da177e4 LT	476	FreeXid(xid);
	477	return rc;
	478	}
	479
	480	static int
	481	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	482	{
	483	int isValid = 1;
	484
	485	/* lock_kernel(); // surely we do not want to lock the kernel for a whole network round trip which could take seconds */
	486
	487	if (direntry->d_inode) {
	488	if (cifs_revalidate(direntry)) {
	489	/* unlock_kernel(); */
	490	return 0;
	491	}
	492	} else {
	493	cFYI(1,
	494	("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
	495	direntry->d_name.name, direntry));
	496	}
	497
	498	/* unlock_kernel(); */
	499
	500	return isValid;
	501	}
	502
	503	/* static int cifs_d_delete(struct dentry *direntry)
	504	{
	505	int rc = 0;
	506
	507	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	508
	509	return rc;
	510	} */
	511
	512	struct dentry_operations cifs_dentry_ops = {
	513	.d_revalidate = cifs_d_revalidate,
	514	/* d_delete: cifs_d_delete, // not needed except for debugging */
	515	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
	516	};