[deliverable/linux.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;

	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 */

	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
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 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;

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

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

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

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

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

	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	if(buf == NULL) {
		kfree(full_path);
		FreeXid(xid);
		return -ENOMEM;
	}
	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) 
		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);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if(rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
			desiredAccess, CREATE_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);
			init_MUTEX(&pCifsFile->lock_sem);
			INIT_LIST_HEAD(&pCifsFile->llist);
			atomic_set(&pCifsFile->wrtPending,0);

			/* set the following in open now 
				pCifsFile->pfile = file; */
			write_lock(&GlobalSMBSeslock);
			list_add(&pCifsFile->tlist,&pTcon->openFileList);
			pCifsInode = CIFS_I(newinode);
			if(pCifsInode) {
				/* if readable file instance put first in list*/
				if (write_only == 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;

	full_path = build_path_from_dentry(direntry);
	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);

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

	/*
	 * Don't allow the separator character in a path component.
	 * The VFS will not allow "/", but "\" is allowed by posix.
	 */
	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		int i;
		for (i = 0; i < direntry->d_name.len; i++)
			if (direntry->d_name.name[i] == '\\') {
				cFYI(1, ("Invalid file name"));
				FreeXid(xid);
				return ERR_PTR(-EINVAL);
			}
	}

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

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

	if (pTcon->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;
88274815	51	char dirsep;
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
88274815	58	dirsep = CIFS_DIR_SEP(CIFS_SB(direntry->d_sb));
1da177e4 LT	59	cifs_bp_rename_retry:
	60	for (temp = direntry; !IS_ROOT(temp);) {
	61	namelen += (1 + temp->d_name.len);
	62	temp = temp->d_parent;
	63	if(temp == NULL) {
	64	cERROR(1,("corrupt dentry"));
	65	return NULL;
	66	}
	67	}
	68
	69	full_path = kmalloc(namelen+1, GFP_KERNEL);
	70	if(full_path == NULL)
	71	return full_path;
	72	full_path[namelen] = 0; /* trailing null */
	73
	74	for (temp = direntry; !IS_ROOT(temp);) {
	75	namelen -= 1 + temp->d_name.len;
	76	if (namelen < 0) {
	77	break;
	78	} else {
7f57356b	79	full_path[namelen] = dirsep;
1da177e4 LT	80	strncpy(full_path + namelen + 1, temp->d_name.name,
	81	temp->d_name.len);
	82	cFYI(0, (" name: %s ", full_path + namelen));
	83	}
	84	temp = temp->d_parent;
	85	if(temp == NULL) {
	86	cERROR(1,("corrupt dentry"));
	87	kfree(full_path);
	88	return NULL;
	89	}
	90	}
	91	if (namelen != 0) {
	92	cERROR(1,
	93	("We did not end path lookup where we expected namelen is %d",
	94	namelen));
	95	/* presumably this is only possible if we were racing with a rename
	96	of one of the parent directories (we can not lock the dentries
	97	above us to prevent this, but retrying should be harmless) */
	98	kfree(full_path);
	99	namelen = 0;
	100	goto cifs_bp_rename_retry;
	101	}
	102
	103	return full_path;
	104	}
	105
737b758c	106	/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
1da177e4	107	{
1da177e4 LT	108	if(full_path == NULL)
	109	return full_path;
	110
	111	full_path[namelen] = '\\';
	112	full_path[namelen+1] = '*';
737b758c SF	113	full_path[namelen+2] = 0;
737b758c SF	114	BB remove above eight lines BB */
1da177e4	115
3979877e	116	/* Inode operations in similar order to how they appear in Linux file fs.h */
1da177e4 LT	117
	118	int
	119	cifs_create(struct inode inode, struct dentry direntry, int mode,
	120	struct nameidata *nd)
	121	{
	122	int rc = -ENOENT;
	123	int xid;
	124	int oplock = 0;
	125	int desiredAccess = GENERIC_READ \| GENERIC_WRITE;
	126	__u16 fileHandle;
	127	struct cifs_sb_info *cifs_sb;
	128	struct cifsTconInfo *pTcon;
	129	char *full_path = NULL;
	130	FILE_ALL_INFO * buf = NULL;
	131	struct inode *newinode = NULL;
	132	struct cifsFileInfo * pCifsFile = NULL;
	133	struct cifsInodeInfo * pCifsInode;
	134	int disposition = FILE_OVERWRITE_IF;
	135	int write_only = FALSE;
	136
	137	xid = GetXid();
	138
	139	cifs_sb = CIFS_SB(inode->i_sb);
	140	pTcon = cifs_sb->tcon;
	141
1da177e4	142	full_path = build_path_from_dentry(direntry);
1da177e4 LT	143	if(full_path == NULL) {
	144	FreeXid(xid);
	145	return -ENOMEM;
	146	}
	147
e08fc045 MS	148	if(nd && (nd->flags & LOOKUP_OPEN)) {
	149	int oflags = nd->intent.open.flags;
	150
	151	desiredAccess = 0;
	152	if (oflags & FMODE_READ)
	153	desiredAccess \|= GENERIC_READ;
	154	if (oflags & FMODE_WRITE) {
	155	desiredAccess \|= GENERIC_WRITE;
	156	if (!(oflags & FMODE_READ))
	157	write_only = TRUE;
1da177e4 LT	158	}
1da177e4 LT	159
e08fc045	160	if((oflags & (O_CREAT \| O_EXCL)) == (O_CREAT \| O_EXCL))
1da177e4	161	disposition = FILE_CREATE;
e08fc045	162	else if((oflags & (O_CREAT \| O_TRUNC)) == (O_CREAT \| O_TRUNC))
1da177e4	163	disposition = FILE_OVERWRITE_IF;
e08fc045	164	else if((oflags & O_CREAT) == O_CREAT)
1da177e4 LT	165	disposition = FILE_OPEN_IF;
	166	else {
	167	cFYI(1,("Create flag not set in create function"));
	168	}
	169	}
	170
	171	/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
	172	if (oplockEnabled)
	173	oplock = REQ_OPLOCK;
	174
	175	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	176	if(buf == NULL) {
	177	kfree(full_path);
	178	FreeXid(xid);
	179	return -ENOMEM;
	180	}
5bafd765 SF	181	if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
5bafd765 SF	182	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
1da177e4	183	desiredAccess, CREATE_NOT_DIR,
737b758c SF	184	&fileHandle, &oplock, buf, cifs_sb->local_nls,
737b758c SF	185	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
5bafd765 SF	186	else
	187	rc = -EIO; /* no NT SMB support fall into legacy open below */
	188
a9d02ad4 SF	189	if(rc == -EIO) {
	190	/* old server, retry the open legacy style */
	191	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
	192	desiredAccess, CREATE_NOT_DIR,
	193	&fileHandle, &oplock, buf, cifs_sb->local_nls,
	194	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	195	}
1da177e4	196	if (rc) {
26a21b98	197	cFYI(1, ("cifs_create returned 0x%x", rc));
1da177e4 LT	198	} else {
	199	/* If Open reported that we actually created a file
	200	then we now have to set the mode if possible */
	201	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
	202	(oplock & CIFS_CREATE_ACTION))
	203	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	204	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
83451879 SF	205	(__u64)current->fsuid,
83451879 SF	206	(__u64)current->fsgid,
1da177e4	207	0 /* dev */,
737b758c SF	208	cifs_sb->local_nls,
	209	cifs_sb->mnt_cifs_flags &
	210	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	211	} else {
	212	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	213	(__u64)-1,
	214	(__u64)-1,
	215	0 /* dev */,
737b758c SF	216	cifs_sb->local_nls,
	217	cifs_sb->mnt_cifs_flags &
	218	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	219	}
1da177e4 LT	220	else {
d7245c2c	221	/* BB implement mode setting via Windows security descriptors */
1da177e4 LT	222	/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
	223	/* could set r/o dos attribute if mode & 0222 == 0 */
	224	}
	225
	226	/* BB server might mask mode so we have to query for Unix case*/
	227	if (pTcon->ses->capabilities & CAP_UNIX)
	228	rc = cifs_get_inode_info_unix(&newinode, full_path,
	229	inode->i_sb,xid);
	230	else {
	231	rc = cifs_get_inode_info(&newinode, full_path,
	232	buf, inode->i_sb,xid);
6473a559	233	if(newinode) {
1da177e4	234	newinode->i_mode = mode;
6473a559 SF	235	if((oplock & CIFS_CREATE_ACTION) &&
	236	(cifs_sb->mnt_cifs_flags &
	237	CIFS_MOUNT_SET_UID)) {
	238	newinode->i_uid = current->fsuid;
	239	newinode->i_gid = current->fsgid;
	240	}
	241	}
1da177e4 LT	242	}
	243
	244	if (rc != 0) {
4a6d87f1 SF	245	cFYI(1,
4a6d87f1 SF	246	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	247	rc));
1da177e4 LT	248	} else {
b92327fe SF	249	if (pTcon->nocase)
	250	direntry->d_op = &cifs_ci_dentry_ops;
	251	else
	252	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	253	d_instantiate(direntry, newinode);
	254	}
	255	if((nd->flags & LOOKUP_OPEN) == FALSE) {
	256	/* mknod case - do not leave file open */
	257	CIFSSMBClose(xid, pTcon, fileHandle);
	258	} else if(newinode) {
d14537f1	259	pCifsFile =
a048d7a8	260	kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
d14537f1 SF	261
	262	if(pCifsFile == NULL)
	263	goto cifs_create_out;
d14537f1 SF	264	pCifsFile->netfid = fileHandle;
	265	pCifsFile->pid = current->tgid;
	266	pCifsFile->pInode = newinode;
	267	pCifsFile->invalidHandle = FALSE;
	268	pCifsFile->closePend = FALSE;
	269	init_MUTEX(&pCifsFile->fh_sem);
e466e487 SF	270	init_MUTEX(&pCifsFile->lock_sem);
	271	INIT_LIST_HEAD(&pCifsFile->llist);
	272	atomic_set(&pCifsFile->wrtPending,0);
	273
d14537f1 SF	274	/* set the following in open now
	275	pCifsFile->pfile = file; */
	276	write_lock(&GlobalSMBSeslock);
	277	list_add(&pCifsFile->tlist,&pTcon->openFileList);
	278	pCifsInode = CIFS_I(newinode);
	279	if(pCifsInode) {
1da177e4	280	/* if readable file instance put first in list*/
d14537f1 SF	281	if (write_only == TRUE) {
	282	list_add_tail(&pCifsFile->flist,
	283	&pCifsInode->openFileList);
	284	} else {
	285	list_add(&pCifsFile->flist,
	286	&pCifsInode->openFileList);
1da177e4	287	}
d14537f1 SF	288	if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
	289	pCifsInode->clientCanCacheAll = TRUE;
	290	pCifsInode->clientCanCacheRead = TRUE;
	291	cFYI(1,("Exclusive Oplock for inode %p",
	292	newinode));
	293	} else if((oplock & 0xF) == OPLOCK_READ)
	294	pCifsInode->clientCanCacheRead = TRUE;
1da177e4	295	}
d14537f1	296	write_unlock(&GlobalSMBSeslock);
1da177e4 LT	297	}
1da177e4 LT	298	}
d14537f1 SF	299	cifs_create_out:
	300	kfree(buf);
	301	kfree(full_path);
1da177e4	302	FreeXid(xid);
1da177e4 LT	303	return rc;
	304	}
	305
86c96b4b SF	306	int cifs_mknod(struct inode inode, struct dentry direntry, int mode,
86c96b4b SF	307	dev_t device_number)
1da177e4 LT	308	{
	309	int rc = -EPERM;
	310	int xid;
	311	struct cifs_sb_info *cifs_sb;
	312	struct cifsTconInfo *pTcon;
	313	char *full_path = NULL;
	314	struct inode * newinode = NULL;
	315
	316	if (!old_valid_dev(device_number))
	317	return -EINVAL;
	318
	319	xid = GetXid();
	320
	321	cifs_sb = CIFS_SB(inode->i_sb);
	322	pTcon = cifs_sb->tcon;
	323
1da177e4	324	full_path = build_path_from_dentry(direntry);
1da177e4 LT	325	if(full_path == NULL)
1da177e4 LT	326	rc = -ENOMEM;
4a6d87f1	327	else if (pTcon->ses->capabilities & CAP_UNIX) {
1da177e4 LT	328	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4 LT	329	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
83451879	330	mode,(__u64)current->fsuid,(__u64)current->fsgid,
737b758c SF	331	device_number, cifs_sb->local_nls,
	332	cifs_sb->mnt_cifs_flags &
	333	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	334	} else {
	335	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	336	full_path, mode, (__u64)-1, (__u64)-1,
737b758c SF	337	device_number, cifs_sb->local_nls,
	338	cifs_sb->mnt_cifs_flags &
	339	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	340	}
	341
	342	if(!rc) {
	343	rc = cifs_get_inode_info_unix(&newinode, full_path,
	344	inode->i_sb,xid);
b92327fe SF	345	if (pTcon->nocase)
	346	direntry->d_op = &cifs_ci_dentry_ops;
	347	else
	348	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	349	if(rc == 0)
	350	d_instantiate(direntry, newinode);
	351	}
d7245c2c	352	} else {
eda3c029 SF	353	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
	354	int oplock = 0;
	355	u16 fileHandle;
	356	FILE_ALL_INFO * buf;
d7245c2c SF	357
d7245c2c SF	358	cFYI(1,("sfu compat create special file"));
d7245c2c	359
eda3c029 SF	360	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	361	if(buf == NULL) {
	362	kfree(full_path);
	363	FreeXid(xid);
	364	return -ENOMEM;
	365	}
	366
	367	rc = CIFSSMBOpen(xid, pTcon, full_path,
	368	FILE_CREATE, /* fail if exists */
	369	GENERIC_WRITE /* BB would
	370	WRITE_OWNER \| WRITE_DAC be better? */,
	371	/* Create a file and set the
	372	file attribute to SYSTEM */
	373	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	374	&fileHandle, &oplock, buf,
	375	cifs_sb->local_nls,
	376	cifs_sb->mnt_cifs_flags &
	377	CIFS_MOUNT_MAP_SPECIAL_CHR);
	378
5bafd765 SF	379	/* BB FIXME - add handling for backlevel servers
	380	which need legacy open and check for all
	381	calls to SMBOpen for fallback to
	382	SMBLeagcyOpen */
eda3c029 SF	383	if(!rc) {
eda3c029 SF	384	/* BB Do not bother to decode buf since no
86c96b4b SF	385	local inode yet to put timestamps in,
	386	but we can reuse it safely */
	387	int bytes_written;
	388	struct win_dev *pdev;
	389	pdev = (struct win_dev *)buf;
	390	if(S_ISCHR(mode)) {
	391	memcpy(pdev->type, "IntxCHR", 8);
	392	pdev->major =
	393	cpu_to_le64(MAJOR(device_number));
	394	pdev->minor =
	395	cpu_to_le64(MINOR(device_number));
	396	rc = CIFSSMBWrite(xid, pTcon,
	397	fileHandle,
	398	sizeof(struct win_dev),
	399	0, &bytes_written, (char *)pdev,
	400	NULL, 0);
	401	} else if(S_ISBLK(mode)) {
	402	memcpy(pdev->type, "IntxBLK", 8);
	403	pdev->major =
	404	cpu_to_le64(MAJOR(device_number));
	405	pdev->minor =
	406	cpu_to_le64(MINOR(device_number));
	407	rc = CIFSSMBWrite(xid, pTcon,
	408	fileHandle,
	409	sizeof(struct win_dev),
	410	0, &bytes_written, (char *)pdev,
	411	NULL, 0);
	412	} /* else if(S_ISFIFO */
eda3c029 SF	413	CIFSSMBClose(xid, pTcon, fileHandle);
	414	d_drop(direntry);
	415	}
	416	kfree(buf);
d7245c2c SF	417	/* add code here to set EAs */
d7245c2c SF	418	}
1da177e4 LT	419	}
1da177e4 LT	420
d14537f1	421	kfree(full_path);
1da177e4	422	FreeXid(xid);
1da177e4 LT	423	return rc;
	424	}
	425
	426
	427	struct dentry *
	428	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry, struct nameidata *nd)
	429	{
	430	int xid;
	431	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	432	struct cifs_sb_info *cifs_sb;
	433	struct cifsTconInfo *pTcon;
	434	struct inode *newInode = NULL;
	435	char *full_path = NULL;
	436
	437	xid = GetXid();
	438
	439	cFYI(1,
	440	(" parent inode = 0x%p name is: %s and dentry = 0x%p",
	441	parent_dir_inode, direntry->d_name.name, direntry));
	442
	443	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
	444
	445	/* check whether path exists */
	446
	447	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	448	pTcon = cifs_sb->tcon;
	449
296034f7 SF	450	/*
	451	* Don't allow the separator character in a path component.
	452	* The VFS will not allow "/", but "\" is allowed by posix.
	453	*/
	454	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
	455	int i;
	456	for (i = 0; i < direntry->d_name.len; i++)
	457	if (direntry->d_name.name[i] == '\\') {
	458	cFYI(1, ("Invalid file name"));
	459	FreeXid(xid);
	460	return ERR_PTR(-EINVAL);
	461	}
	462	}
	463
1da177e4 LT	464	/* can not grab the rename sem here since it would
	465	deadlock in the cases (beginning of sys_rename itself)
	466	in which we already have the sb rename sem */
	467	full_path = build_path_from_dentry(direntry);
	468	if(full_path == NULL) {
	469	FreeXid(xid);
	470	return ERR_PTR(-ENOMEM);
	471	}
	472
	473	if (direntry->d_inode != NULL) {
	474	cFYI(1, (" non-NULL inode in lookup"));
	475	} else {
	476	cFYI(1, (" NULL inode in lookup"));
	477	}
	478	cFYI(1,
	479	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	480
	481	if (pTcon->ses->capabilities & CAP_UNIX)
	482	rc = cifs_get_inode_info_unix(&newInode, full_path,
	483	parent_dir_inode->i_sb,xid);
	484	else
	485	rc = cifs_get_inode_info(&newInode, full_path, NULL,
	486	parent_dir_inode->i_sb,xid);
	487
	488	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	489	if (pTcon->nocase)
	490	direntry->d_op = &cifs_ci_dentry_ops;
	491	else
	492	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	493	d_add(direntry, newInode);
1da177e4 LT	494
3abb9272 SF	495	/* since paths are not looked up by component - the parent
3abb9272 SF	496	directories are presumed to be good here */
1da177e4 LT	497	renew_parental_timestamps(direntry);
	498
	499	} else if (rc == -ENOENT) {
	500	rc = 0;
3abb9272 SF	501	direntry->d_time = jiffies;
	502	if (pTcon->nocase)
	503	direntry->d_op = &cifs_ci_dentry_ops;
	504	else
	505	direntry->d_op = &cifs_dentry_ops;
1da177e4	506	d_add(direntry, NULL);
3abb9272 SF	507	/* if it was once a directory (but how can we tell?) we could do
3abb9272 SF	508	shrink_dcache_parent(direntry); */
1da177e4	509	} else {
b2aeb9d5 SF	510	cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
b2aeb9d5 SF	511	rc,full_path));
1da177e4 LT	512	/* BB special case check for Access Denied - watch security
	513	exposure of returning dir info implicitly via different rc
	514	if file exists or not but no access BB */
	515	}
	516
d14537f1	517	kfree(full_path);
1da177e4 LT	518	FreeXid(xid);
	519	return ERR_PTR(rc);
	520	}
	521
1da177e4 LT	522	static int
	523	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	524	{
	525	int isValid = 1;
	526
1da177e4 LT	527	if (direntry->d_inode) {
1da177e4 LT	528	if (cifs_revalidate(direntry)) {
1da177e4 LT	529	return 0;
	530	}
	531	} else {
3abb9272 SF	532	cFYI(1, ("neg dentry 0x%p name = %s",
	533	direntry, direntry->d_name.name));
	534	if(time_after(jiffies, direntry->d_time + HZ) \|\|
	535	!lookupCacheEnabled) {
	536	d_drop(direntry);
	537	isValid = 0;
	538	}
1da177e4 LT	539	}
1da177e4 LT	540
1da177e4 LT	541	return isValid;
	542	}
	543
	544	/* static int cifs_d_delete(struct dentry *direntry)
	545	{
	546	int rc = 0;
	547
	548	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	549
	550	return rc;
	551	} */
	552
	553	struct dentry_operations cifs_dentry_ops = {
	554	.d_revalidate = cifs_d_revalidate,
	555	/* d_delete: cifs_d_delete, // not needed except for debugging */
	556	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
	557	};
b92327fe SF	558
	559	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	560	{
	561	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	562	unsigned long hash;
	563	int i;
	564
	565	hash = init_name_hash();
	566	for (i = 0; i < q->len; i++)
	567	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	568	hash);
	569	q->hash = end_name_hash(hash);
	570
	571	return 0;
	572	}
	573
	574	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	575	struct qstr *b)
	576	{
	577	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	578
	579	if ((a->len == b->len) &&
	580	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	581	/*
	582	* To preserve case, don't let an existing negative dentry's
	583	* case take precedence. If a is not a negative dentry, this
	584	* should have no side effects
	585	*/
	586	memcpy((unsigned char *)a->name, b->name, a->len);
	587	return 0;
	588	}
	589	return 1;
	590	}
	591
	592	struct dentry_operations cifs_ci_dentry_ops = {
	593	.d_revalidate = cifs_d_revalidate,
	594	.d_hash = cifs_ci_hash,
	595	.d_compare = cifs_ci_compare,
	596	};