[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / cifs / dir.c

/*
 *   fs/cifs/dir.c
 *
 *   vfs operations that deal with dentries
 * 
 *   Copyright (C) International Business Machines  Corp., 2002,2005
 *   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)
{
	struct dentry *temp;
	int namelen = 0;
	char *full_path;
	char dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_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_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] = 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 != 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);
	up(&direntry->d_sb->s_vfs_rename_sem);
	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;
	}

	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 == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(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->fsuid,
					(__u64)current->fsgid,
					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((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->flags & LOOKUP_OPEN) == FALSE) {
			/* 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);
			/* 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;
	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->fsuid,(__u64)current->fsgid,
				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,
				   but we can reuse it safely */
				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));

	/* 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)) {
		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 {
		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;

	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 */
	/* 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	*
83451879	6	* Copyright (C) International Business Machines Corp., 2002,2005
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
	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;
7f57356b	51	char dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
1da177e4 LT	52
	53	if(direntry == NULL)
	54	return NULL; /* not much we can do if dentry is freed and
	55	we need to reopen the file after it was closed implicitly
	56	when the server crashed */
	57
	58	cifs_bp_rename_retry:
	59	for (temp = direntry; !IS_ROOT(temp);) {
	60	namelen += (1 + temp->d_name.len);
	61	temp = temp->d_parent;
	62	if(temp == NULL) {
	63	cERROR(1,("corrupt dentry"));
	64	return NULL;
	65	}
	66	}
	67
	68	full_path = kmalloc(namelen+1, GFP_KERNEL);
	69	if(full_path == NULL)
	70	return full_path;
	71	full_path[namelen] = 0; /* trailing null */
	72
	73	for (temp = direntry; !IS_ROOT(temp);) {
	74	namelen -= 1 + temp->d_name.len;
	75	if (namelen < 0) {
	76	break;
	77	} else {
7f57356b	78	full_path[namelen] = dirsep;
1da177e4 LT	79	strncpy(full_path + namelen + 1, temp->d_name.name,
	80	temp->d_name.len);
	81	cFYI(0, (" name: %s ", full_path + namelen));
	82	}
	83	temp = temp->d_parent;
	84	if(temp == NULL) {
	85	cERROR(1,("corrupt dentry"));
	86	kfree(full_path);
	87	return NULL;
	88	}
	89	}
	90	if (namelen != 0) {
	91	cERROR(1,
	92	("We did not end path lookup where we expected namelen is %d",
	93	namelen));
	94	/* presumably this is only possible if we were racing with a rename
	95	of one of the parent directories (we can not lock the dentries
	96	above us to prevent this, but retrying should be harmless) */
	97	kfree(full_path);
	98	namelen = 0;
	99	goto cifs_bp_rename_retry;
	100	}
	101
	102	return full_path;
	103	}
	104
737b758c	105	/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
1da177e4	106	{
1da177e4 LT	107	if(full_path == NULL)
	108	return full_path;
	109
	110	full_path[namelen] = '\\';
	111	full_path[namelen+1] = '*';
737b758c SF	112	full_path[namelen+2] = 0;
737b758c SF	113	BB remove above eight lines BB */
1da177e4 LT	114
	115	/* Inode operations in similar order to how they appear in the Linux file fs.h */
	116
	117	int
	118	cifs_create(struct inode inode, struct dentry direntry, int mode,
	119	struct nameidata *nd)
	120	{
	121	int rc = -ENOENT;
	122	int xid;
	123	int oplock = 0;
	124	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	125	__u16 fileHandle;
	126	struct cifs_sb_info *cifs_sb;
	127	struct cifsTconInfo *pTcon;
	128	char *full_path = NULL;
	129	FILE_ALL_INFO * buf = NULL;
	130	struct inode *newinode = NULL;
	131	struct cifsFileInfo * pCifsFile = NULL;
	132	struct cifsInodeInfo * pCifsInode;
	133	int disposition = FILE_OVERWRITE_IF;
	134	int write_only = FALSE;
	135
	136	xid = GetXid();
	137
	138	cifs_sb = CIFS_SB(inode->i_sb);
	139	pTcon = cifs_sb->tcon;
	140
	141	down(&direntry->d_sb->s_vfs_rename_sem);
	142	full_path = build_path_from_dentry(direntry);
	143	up(&direntry->d_sb->s_vfs_rename_sem);
	144	if(full_path == NULL) {
	145	FreeXid(xid);
	146	return -ENOMEM;
	147	}
	148
e08fc045 MS	149	if(nd && (nd->flags & LOOKUP_OPEN)) {
	150	int oflags = nd->intent.open.flags;
	151
	152	desiredAccess = 0;
	153	if (oflags & FMODE_READ)
	154	desiredAccess \|= GENERIC_READ;
	155	if (oflags & FMODE_WRITE) {
	156	desiredAccess \|= GENERIC_WRITE;
	157	if (!(oflags & FMODE_READ))
	158	write_only = TRUE;
1da177e4 LT	159	}
1da177e4 LT	160
e08fc045	161	if((oflags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
1da177e4	162	disposition = FILE_CREATE;
e08fc045	163	else if((oflags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
1da177e4	164	disposition = FILE_OVERWRITE_IF;
e08fc045	165	else if((oflags & O_CREAT) == O_CREAT)
1da177e4 LT	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);
a9d02ad4 SF	187	if(rc == -EIO) {
	188	/* old server, retry the open legacy style */
	189	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
	190	desiredAccess, CREATE_NOT_DIR,
	191	&fileHandle, &oplock, buf, cifs_sb->local_nls,
	192	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	193	}
1da177e4 LT	194	if (rc) {
	195	cFYI(1, ("cifs_create returned 0x%x ", rc));
	196	} else {
	197	/* If Open reported that we actually created a file
	198	then we now have to set the mode if possible */
	199	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
	200	(oplock & CIFS_CREATE_ACTION))
	201	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	202	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
83451879 SF	203	(__u64)current->fsuid,
83451879 SF	204	(__u64)current->fsgid,
1da177e4	205	0 /* dev */,
737b758c SF	206	cifs_sb->local_nls,
	207	cifs_sb->mnt_cifs_flags &
	208	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	209	} else {
	210	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	211	(__u64)-1,
	212	(__u64)-1,
	213	0 /* dev */,
737b758c SF	214	cifs_sb->local_nls,
	215	cifs_sb->mnt_cifs_flags &
	216	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	217	}
1da177e4 LT	218	else {
d7245c2c	219	/* BB implement mode setting via Windows security descriptors */
1da177e4 LT	220	/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
	221	/* could set r/o dos attribute if mode & 0222 == 0 */
	222	}
	223
	224	/* BB server might mask mode so we have to query for Unix case*/
	225	if (pTcon->ses->capabilities & CAP_UNIX)
	226	rc = cifs_get_inode_info_unix(&newinode, full_path,
	227	inode->i_sb,xid);
	228	else {
	229	rc = cifs_get_inode_info(&newinode, full_path,
	230	buf, inode->i_sb,xid);
6473a559	231	if(newinode) {
1da177e4	232	newinode->i_mode = mode;
6473a559 SF	233	if((oplock & CIFS_CREATE_ACTION) &&
	234	(cifs_sb->mnt_cifs_flags &
	235	CIFS_MOUNT_SET_UID)) {
	236	newinode->i_uid = current->fsuid;
	237	newinode->i_gid = current->fsgid;
	238	}
	239	}
1da177e4 LT	240	}
	241
	242	if (rc != 0) {
4a6d87f1 SF	243	cFYI(1,
4a6d87f1 SF	244	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	245	rc));
1da177e4 LT	246	} else {
b92327fe SF	247	if (pTcon->nocase)
	248	direntry->d_op = &cifs_ci_dentry_ops;
	249	else
	250	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	251	d_instantiate(direntry, newinode);
	252	}
	253	if((nd->flags & LOOKUP_OPEN) == FALSE) {
	254	/* mknod case - do not leave file open */
	255	CIFSSMBClose(xid, pTcon, fileHandle);
	256	} else if(newinode) {
d14537f1	257	pCifsFile =
a048d7a8	258	kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
d14537f1 SF	259
	260	if(pCifsFile == NULL)
	261	goto cifs_create_out;
d14537f1 SF	262	pCifsFile->netfid = fileHandle;
	263	pCifsFile->pid = current->tgid;
	264	pCifsFile->pInode = newinode;
	265	pCifsFile->invalidHandle = FALSE;
	266	pCifsFile->closePend = FALSE;
	267	init_MUTEX(&pCifsFile->fh_sem);
	268	/* set the following in open now
	269	pCifsFile->pfile = file; */
	270	write_lock(&GlobalSMBSeslock);
	271	list_add(&pCifsFile->tlist,&pTcon->openFileList);
	272	pCifsInode = CIFS_I(newinode);
	273	if(pCifsInode) {
1da177e4	274	/* if readable file instance put first in list*/
d14537f1 SF	275	if (write_only == TRUE) {
	276	list_add_tail(&pCifsFile->flist,
	277	&pCifsInode->openFileList);
	278	} else {
	279	list_add(&pCifsFile->flist,
	280	&pCifsInode->openFileList);
1da177e4	281	}
d14537f1 SF	282	if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
	283	pCifsInode->clientCanCacheAll = TRUE;
	284	pCifsInode->clientCanCacheRead = TRUE;
	285	cFYI(1,("Exclusive Oplock for inode %p",
	286	newinode));
	287	} else if((oplock & 0xF) == OPLOCK_READ)
	288	pCifsInode->clientCanCacheRead = TRUE;
1da177e4	289	}
d14537f1	290	write_unlock(&GlobalSMBSeslock);
1da177e4 LT	291	}
1da177e4 LT	292	}
d14537f1 SF	293	cifs_create_out:
	294	kfree(buf);
	295	kfree(full_path);
1da177e4	296	FreeXid(xid);
1da177e4 LT	297	return rc;
	298	}
	299
86c96b4b SF	300	int cifs_mknod(struct inode inode, struct dentry direntry, int mode,
86c96b4b SF	301	dev_t device_number)
1da177e4 LT	302	{
	303	int rc = -EPERM;
	304	int xid;
	305	struct cifs_sb_info *cifs_sb;
	306	struct cifsTconInfo *pTcon;
	307	char *full_path = NULL;
	308	struct inode * newinode = NULL;
	309
	310	if (!old_valid_dev(device_number))
	311	return -EINVAL;
	312
	313	xid = GetXid();
	314
	315	cifs_sb = CIFS_SB(inode->i_sb);
	316	pTcon = cifs_sb->tcon;
	317
	318	down(&direntry->d_sb->s_vfs_rename_sem);
	319	full_path = build_path_from_dentry(direntry);
	320	up(&direntry->d_sb->s_vfs_rename_sem);
	321	if(full_path == NULL)
	322	rc = -ENOMEM;
4a6d87f1	323	else if (pTcon->ses->capabilities & CAP_UNIX) {
1da177e4 LT	324	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4 LT	325	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
83451879	326	mode,(__u64)current->fsuid,(__u64)current->fsgid,
737b758c SF	327	device_number, cifs_sb->local_nls,
	328	cifs_sb->mnt_cifs_flags &
	329	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	330	} else {
	331	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	332	full_path, mode, (__u64)-1, (__u64)-1,
737b758c SF	333	device_number, cifs_sb->local_nls,
	334	cifs_sb->mnt_cifs_flags &
	335	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	336	}
	337
	338	if(!rc) {
	339	rc = cifs_get_inode_info_unix(&newinode, full_path,
	340	inode->i_sb,xid);
b92327fe SF	341	if (pTcon->nocase)
	342	direntry->d_op = &cifs_ci_dentry_ops;
	343	else
	344	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	345	if(rc == 0)
	346	d_instantiate(direntry, newinode);
	347	}
d7245c2c	348	} else {
eda3c029 SF	349	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
	350	int oplock = 0;
	351	u16 fileHandle;
	352	FILE_ALL_INFO * buf;
d7245c2c SF	353
d7245c2c SF	354	cFYI(1,("sfu compat create special file"));
d7245c2c	355
eda3c029 SF	356	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	357	if(buf == NULL) {
	358	kfree(full_path);
	359	FreeXid(xid);
	360	return -ENOMEM;
	361	}
	362
	363	rc = CIFSSMBOpen(xid, pTcon, full_path,
	364	FILE_CREATE, /* fail if exists */
	365	GENERIC_WRITE /* BB would
	366	WRITE_OWNER \| WRITE_DAC be better? */,
	367	/* Create a file and set the
	368	file attribute to SYSTEM */
	369	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	370	&fileHandle, &oplock, buf,
	371	cifs_sb->local_nls,
	372	cifs_sb->mnt_cifs_flags &
	373	CIFS_MOUNT_MAP_SPECIAL_CHR);
	374
	375	if(!rc) {
	376	/* BB Do not bother to decode buf since no
86c96b4b SF	377	local inode yet to put timestamps in,
	378	but we can reuse it safely */
	379	int bytes_written;
	380	struct win_dev *pdev;
	381	pdev = (struct win_dev *)buf;
	382	if(S_ISCHR(mode)) {
	383	memcpy(pdev->type, "IntxCHR", 8);
	384	pdev->major =
	385	cpu_to_le64(MAJOR(device_number));
	386	pdev->minor =
	387	cpu_to_le64(MINOR(device_number));
	388	rc = CIFSSMBWrite(xid, pTcon,
	389	fileHandle,
	390	sizeof(struct win_dev),
	391	0, &bytes_written, (char *)pdev,
	392	NULL, 0);
	393	} else if(S_ISBLK(mode)) {
	394	memcpy(pdev->type, "IntxBLK", 8);
	395	pdev->major =
	396	cpu_to_le64(MAJOR(device_number));
	397	pdev->minor =
	398	cpu_to_le64(MINOR(device_number));
	399	rc = CIFSSMBWrite(xid, pTcon,
	400	fileHandle,
	401	sizeof(struct win_dev),
	402	0, &bytes_written, (char *)pdev,
	403	NULL, 0);
	404	} /* else if(S_ISFIFO */
eda3c029 SF	405	CIFSSMBClose(xid, pTcon, fileHandle);
	406	d_drop(direntry);
	407	}
	408	kfree(buf);
d7245c2c SF	409	/* add code here to set EAs */
d7245c2c SF	410	}
1da177e4 LT	411	}
1da177e4 LT	412
d14537f1	413	kfree(full_path);
1da177e4	414	FreeXid(xid);
1da177e4 LT	415	return rc;
	416	}
	417
	418
	419	struct dentry *
	420	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry, struct nameidata *nd)
	421	{
	422	int xid;
	423	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	424	struct cifs_sb_info *cifs_sb;
	425	struct cifsTconInfo *pTcon;
	426	struct inode *newInode = NULL;
	427	char *full_path = NULL;
	428
	429	xid = GetXid();
	430
	431	cFYI(1,
	432	(" parent inode = 0x%p name is: %s and dentry = 0x%p",
	433	parent_dir_inode, direntry->d_name.name, direntry));
	434
	435	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
	436
	437	/* check whether path exists */
	438
	439	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	440	pTcon = cifs_sb->tcon;
	441
	442	/* can not grab the rename sem here since it would
	443	deadlock in the cases (beginning of sys_rename itself)
	444	in which we already have the sb rename sem */
	445	full_path = build_path_from_dentry(direntry);
	446	if(full_path == NULL) {
	447	FreeXid(xid);
	448	return ERR_PTR(-ENOMEM);
	449	}
	450
	451	if (direntry->d_inode != NULL) {
	452	cFYI(1, (" non-NULL inode in lookup"));
	453	} else {
	454	cFYI(1, (" NULL inode in lookup"));
	455	}
	456	cFYI(1,
	457	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	458
	459	if (pTcon->ses->capabilities & CAP_UNIX)
	460	rc = cifs_get_inode_info_unix(&newInode, full_path,
	461	parent_dir_inode->i_sb,xid);
	462	else
	463	rc = cifs_get_inode_info(&newInode, full_path, NULL,
	464	parent_dir_inode->i_sb,xid);
	465
	466	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	467	if (pTcon->nocase)
	468	direntry->d_op = &cifs_ci_dentry_ops;
	469	else
	470	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	471	d_add(direntry, newInode);
1da177e4 LT	472
3abb9272 SF	473	/* since paths are not looked up by component - the parent
3abb9272 SF	474	directories are presumed to be good here */
1da177e4 LT	475	renew_parental_timestamps(direntry);
	476
	477	} else if (rc == -ENOENT) {
	478	rc = 0;
3abb9272 SF	479	direntry->d_time = jiffies;
	480	if (pTcon->nocase)
	481	direntry->d_op = &cifs_ci_dentry_ops;
	482	else
	483	direntry->d_op = &cifs_dentry_ops;
1da177e4	484	d_add(direntry, NULL);
3abb9272 SF	485	/* if it was once a directory (but how can we tell?) we could do
3abb9272 SF	486	shrink_dcache_parent(direntry); */
1da177e4	487	} else {
b2aeb9d5 SF	488	cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
b2aeb9d5 SF	489	rc,full_path));
1da177e4 LT	490	/* BB special case check for Access Denied - watch security
	491	exposure of returning dir info implicitly via different rc
	492	if file exists or not but no access BB */
	493	}
	494
d14537f1	495	kfree(full_path);
1da177e4 LT	496	FreeXid(xid);
	497	return ERR_PTR(rc);
	498	}
	499
1da177e4 LT	500	static int
	501	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	502	{
	503	int isValid = 1;
	504
1da177e4 LT	505	if (direntry->d_inode) {
1da177e4 LT	506	if (cifs_revalidate(direntry)) {
1da177e4 LT	507	return 0;
	508	}
	509	} else {
3abb9272 SF	510	cFYI(1, ("neg dentry 0x%p name = %s",
	511	direntry, direntry->d_name.name));
	512	if(time_after(jiffies, direntry->d_time + HZ) \|\|
	513	!lookupCacheEnabled) {
	514	d_drop(direntry);
	515	isValid = 0;
	516	}
1da177e4 LT	517	}
1da177e4 LT	518
1da177e4 LT	519	return isValid;
	520	}
	521
	522	/* static int cifs_d_delete(struct dentry *direntry)
	523	{
	524	int rc = 0;
	525
	526	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	527
	528	return rc;
	529	} */
	530
	531	struct dentry_operations cifs_dentry_ops = {
	532	.d_revalidate = cifs_d_revalidate,
	533	/* d_delete: cifs_d_delete, // not needed except for debugging */
	534	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
	535	};
b92327fe SF	536
	537	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	538	{
	539	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	540	unsigned long hash;
	541	int i;
	542
	543	hash = init_name_hash();
	544	for (i = 0; i < q->len; i++)
	545	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	546	hash);
	547	q->hash = end_name_hash(hash);
	548
	549	return 0;
	550	}
	551
	552	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	553	struct qstr *b)
	554	{
	555	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	556
	557	if ((a->len == b->len) &&
	558	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	559	/*
	560	* To preserve case, don't let an existing negative dentry's
	561	* case take precedence. If a is not a negative dentry, this
	562	* should have no side effects
	563	*/
	564	memcpy((unsigned char *)a->name, b->name, a->len);
	565	return 0;
	566	}
	567	return 1;
	568	}
	569
	570	struct dentry_operations cifs_ci_dentry_ops = {
	571	.d_revalidate = cifs_d_revalidate,
	572	.d_hash = cifs_ci_hash,
	573	.d_compare = cifs_ci_compare,
	574	};