[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;

	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;
	}

	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;

	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);

			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	}
	181
	182	rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
	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);
a9d02ad4 SF	186	if(rc == -EIO) {
	187	/* old server, retry the open legacy style */
	188	rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
	189	desiredAccess, CREATE_NOT_DIR,
	190	&fileHandle, &oplock, buf, cifs_sb->local_nls,
	191	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	192	}
1da177e4	193	if (rc) {
26a21b98	194	cFYI(1, ("cifs_create returned 0x%x", rc));
1da177e4 LT	195	} else {
	196	/* If Open reported that we actually created a file
	197	then we now have to set the mode if possible */
	198	if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
	199	(oplock & CIFS_CREATE_ACTION))
	200	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
	201	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
83451879 SF	202	(__u64)current->fsuid,
83451879 SF	203	(__u64)current->fsgid,
1da177e4	204	0 /* dev */,
737b758c SF	205	cifs_sb->local_nls,
	206	cifs_sb->mnt_cifs_flags &
	207	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	208	} else {
	209	CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
	210	(__u64)-1,
	211	(__u64)-1,
	212	0 /* dev */,
737b758c SF	213	cifs_sb->local_nls,
	214	cifs_sb->mnt_cifs_flags &
	215	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	216	}
1da177e4 LT	217	else {
d7245c2c	218	/* BB implement mode setting via Windows security descriptors */
1da177e4 LT	219	/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
	220	/* could set r/o dos attribute if mode & 0222 == 0 */
	221	}
	222
	223	/* BB server might mask mode so we have to query for Unix case*/
	224	if (pTcon->ses->capabilities & CAP_UNIX)
	225	rc = cifs_get_inode_info_unix(&newinode, full_path,
	226	inode->i_sb,xid);
	227	else {
	228	rc = cifs_get_inode_info(&newinode, full_path,
	229	buf, inode->i_sb,xid);
6473a559	230	if(newinode) {
1da177e4	231	newinode->i_mode = mode;
6473a559 SF	232	if((oplock & CIFS_CREATE_ACTION) &&
	233	(cifs_sb->mnt_cifs_flags &
	234	CIFS_MOUNT_SET_UID)) {
	235	newinode->i_uid = current->fsuid;
	236	newinode->i_gid = current->fsgid;
	237	}
	238	}
1da177e4 LT	239	}
	240
	241	if (rc != 0) {
4a6d87f1 SF	242	cFYI(1,
4a6d87f1 SF	243	("Create worked but get_inode_info failed rc = %d",
1da177e4 LT	244	rc));
1da177e4 LT	245	} else {
b92327fe SF	246	if (pTcon->nocase)
	247	direntry->d_op = &cifs_ci_dentry_ops;
	248	else
	249	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	250	d_instantiate(direntry, newinode);
	251	}
	252	if((nd->flags & LOOKUP_OPEN) == FALSE) {
	253	/* mknod case - do not leave file open */
	254	CIFSSMBClose(xid, pTcon, fileHandle);
	255	} else if(newinode) {
d14537f1	256	pCifsFile =
a048d7a8	257	kzalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
d14537f1 SF	258
	259	if(pCifsFile == NULL)
	260	goto cifs_create_out;
d14537f1 SF	261	pCifsFile->netfid = fileHandle;
	262	pCifsFile->pid = current->tgid;
	263	pCifsFile->pInode = newinode;
	264	pCifsFile->invalidHandle = FALSE;
	265	pCifsFile->closePend = FALSE;
	266	init_MUTEX(&pCifsFile->fh_sem);
	267	/* set the following in open now
	268	pCifsFile->pfile = file; */
	269	write_lock(&GlobalSMBSeslock);
	270	list_add(&pCifsFile->tlist,&pTcon->openFileList);
	271	pCifsInode = CIFS_I(newinode);
	272	if(pCifsInode) {
1da177e4	273	/* if readable file instance put first in list*/
d14537f1 SF	274	if (write_only == TRUE) {
	275	list_add_tail(&pCifsFile->flist,
	276	&pCifsInode->openFileList);
	277	} else {
	278	list_add(&pCifsFile->flist,
	279	&pCifsInode->openFileList);
1da177e4	280	}
d14537f1 SF	281	if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
	282	pCifsInode->clientCanCacheAll = TRUE;
	283	pCifsInode->clientCanCacheRead = TRUE;
	284	cFYI(1,("Exclusive Oplock for inode %p",
	285	newinode));
	286	} else if((oplock & 0xF) == OPLOCK_READ)
	287	pCifsInode->clientCanCacheRead = TRUE;
1da177e4	288	}
d14537f1	289	write_unlock(&GlobalSMBSeslock);
1da177e4 LT	290	}
1da177e4 LT	291	}
d14537f1 SF	292	cifs_create_out:
	293	kfree(buf);
	294	kfree(full_path);
1da177e4	295	FreeXid(xid);
1da177e4 LT	296	return rc;
	297	}
	298
86c96b4b SF	299	int cifs_mknod(struct inode inode, struct dentry direntry, int mode,
86c96b4b SF	300	dev_t device_number)
1da177e4 LT	301	{
	302	int rc = -EPERM;
	303	int xid;
	304	struct cifs_sb_info *cifs_sb;
	305	struct cifsTconInfo *pTcon;
	306	char *full_path = NULL;
	307	struct inode * newinode = NULL;
	308
	309	if (!old_valid_dev(device_number))
	310	return -EINVAL;
	311
	312	xid = GetXid();
	313
	314	cifs_sb = CIFS_SB(inode->i_sb);
	315	pTcon = cifs_sb->tcon;
	316
1da177e4	317	full_path = build_path_from_dentry(direntry);
1da177e4 LT	318	if(full_path == NULL)
1da177e4 LT	319	rc = -ENOMEM;
4a6d87f1	320	else if (pTcon->ses->capabilities & CAP_UNIX) {
1da177e4 LT	321	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4 LT	322	rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
83451879	323	mode,(__u64)current->fsuid,(__u64)current->fsgid,
737b758c SF	324	device_number, cifs_sb->local_nls,
	325	cifs_sb->mnt_cifs_flags &
	326	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	327	} else {
	328	rc = CIFSSMBUnixSetPerms(xid, pTcon,
	329	full_path, mode, (__u64)-1, (__u64)-1,
737b758c SF	330	device_number, cifs_sb->local_nls,
	331	cifs_sb->mnt_cifs_flags &
	332	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	333	}
	334
	335	if(!rc) {
	336	rc = cifs_get_inode_info_unix(&newinode, full_path,
	337	inode->i_sb,xid);
b92327fe SF	338	if (pTcon->nocase)
	339	direntry->d_op = &cifs_ci_dentry_ops;
	340	else
	341	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	342	if(rc == 0)
	343	d_instantiate(direntry, newinode);
	344	}
d7245c2c	345	} else {
eda3c029 SF	346	if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
	347	int oplock = 0;
	348	u16 fileHandle;
	349	FILE_ALL_INFO * buf;
d7245c2c SF	350
d7245c2c SF	351	cFYI(1,("sfu compat create special file"));
d7245c2c	352
eda3c029 SF	353	buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
	354	if(buf == NULL) {
	355	kfree(full_path);
	356	FreeXid(xid);
	357	return -ENOMEM;
	358	}
	359
	360	rc = CIFSSMBOpen(xid, pTcon, full_path,
	361	FILE_CREATE, /* fail if exists */
	362	GENERIC_WRITE /* BB would
	363	WRITE_OWNER \| WRITE_DAC be better? */,
	364	/* Create a file and set the
	365	file attribute to SYSTEM */
	366	CREATE_NOT_DIR \| CREATE_OPTION_SPECIAL,
	367	&fileHandle, &oplock, buf,
	368	cifs_sb->local_nls,
	369	cifs_sb->mnt_cifs_flags &
	370	CIFS_MOUNT_MAP_SPECIAL_CHR);
	371
	372	if(!rc) {
	373	/* BB Do not bother to decode buf since no
86c96b4b SF	374	local inode yet to put timestamps in,
	375	but we can reuse it safely */
	376	int bytes_written;
	377	struct win_dev *pdev;
	378	pdev = (struct win_dev *)buf;
	379	if(S_ISCHR(mode)) {
	380	memcpy(pdev->type, "IntxCHR", 8);
	381	pdev->major =
	382	cpu_to_le64(MAJOR(device_number));
	383	pdev->minor =
	384	cpu_to_le64(MINOR(device_number));
	385	rc = CIFSSMBWrite(xid, pTcon,
	386	fileHandle,
	387	sizeof(struct win_dev),
	388	0, &bytes_written, (char *)pdev,
	389	NULL, 0);
	390	} else if(S_ISBLK(mode)) {
	391	memcpy(pdev->type, "IntxBLK", 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_ISFIFO */
eda3c029 SF	402	CIFSSMBClose(xid, pTcon, fileHandle);
	403	d_drop(direntry);
	404	}
	405	kfree(buf);
d7245c2c SF	406	/* add code here to set EAs */
d7245c2c SF	407	}
1da177e4 LT	408	}
1da177e4 LT	409
d14537f1	410	kfree(full_path);
1da177e4	411	FreeXid(xid);
1da177e4 LT	412	return rc;
	413	}
	414
	415
	416	struct dentry *
	417	cifs_lookup(struct inode parent_dir_inode, struct dentry direntry, struct nameidata *nd)
	418	{
	419	int xid;
	420	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	421	struct cifs_sb_info *cifs_sb;
	422	struct cifsTconInfo *pTcon;
	423	struct inode *newInode = NULL;
	424	char *full_path = NULL;
	425
	426	xid = GetXid();
	427
	428	cFYI(1,
	429	(" parent inode = 0x%p name is: %s and dentry = 0x%p",
	430	parent_dir_inode, direntry->d_name.name, direntry));
	431
	432	/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
	433
	434	/* check whether path exists */
	435
	436	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	437	pTcon = cifs_sb->tcon;
	438
296034f7 SF	439	/*
	440	* Don't allow the separator character in a path component.
	441	* The VFS will not allow "/", but "\" is allowed by posix.
	442	*/
	443	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
	444	int i;
	445	for (i = 0; i < direntry->d_name.len; i++)
	446	if (direntry->d_name.name[i] == '\\') {
	447	cFYI(1, ("Invalid file name"));
	448	FreeXid(xid);
	449	return ERR_PTR(-EINVAL);
	450	}
	451	}
	452
1da177e4 LT	453	/* can not grab the rename sem here since it would
	454	deadlock in the cases (beginning of sys_rename itself)
	455	in which we already have the sb rename sem */
	456	full_path = build_path_from_dentry(direntry);
	457	if(full_path == NULL) {
	458	FreeXid(xid);
	459	return ERR_PTR(-ENOMEM);
	460	}
	461
	462	if (direntry->d_inode != NULL) {
	463	cFYI(1, (" non-NULL inode in lookup"));
	464	} else {
	465	cFYI(1, (" NULL inode in lookup"));
	466	}
	467	cFYI(1,
	468	(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
	469
	470	if (pTcon->ses->capabilities & CAP_UNIX)
	471	rc = cifs_get_inode_info_unix(&newInode, full_path,
	472	parent_dir_inode->i_sb,xid);
	473	else
	474	rc = cifs_get_inode_info(&newInode, full_path, NULL,
	475	parent_dir_inode->i_sb,xid);
	476
	477	if ((rc == 0) && (newInode != NULL)) {
b92327fe SF	478	if (pTcon->nocase)
	479	direntry->d_op = &cifs_ci_dentry_ops;
	480	else
	481	direntry->d_op = &cifs_dentry_ops;
1da177e4 LT	482	d_add(direntry, newInode);
1da177e4 LT	483
3abb9272 SF	484	/* since paths are not looked up by component - the parent
3abb9272 SF	485	directories are presumed to be good here */
1da177e4 LT	486	renew_parental_timestamps(direntry);
	487
	488	} else if (rc == -ENOENT) {
	489	rc = 0;
3abb9272 SF	490	direntry->d_time = jiffies;
	491	if (pTcon->nocase)
	492	direntry->d_op = &cifs_ci_dentry_ops;
	493	else
	494	direntry->d_op = &cifs_dentry_ops;
1da177e4	495	d_add(direntry, NULL);
3abb9272 SF	496	/* if it was once a directory (but how can we tell?) we could do
3abb9272 SF	497	shrink_dcache_parent(direntry); */
1da177e4	498	} else {
b2aeb9d5 SF	499	cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
b2aeb9d5 SF	500	rc,full_path));
1da177e4 LT	501	/* BB special case check for Access Denied - watch security
	502	exposure of returning dir info implicitly via different rc
	503	if file exists or not but no access BB */
	504	}
	505
d14537f1	506	kfree(full_path);
1da177e4 LT	507	FreeXid(xid);
	508	return ERR_PTR(rc);
	509	}
	510
1da177e4 LT	511	static int
	512	cifs_d_revalidate(struct dentry direntry, struct nameidata nd)
	513	{
	514	int isValid = 1;
	515
1da177e4 LT	516	if (direntry->d_inode) {
1da177e4 LT	517	if (cifs_revalidate(direntry)) {
1da177e4 LT	518	return 0;
	519	}
	520	} else {
3abb9272 SF	521	cFYI(1, ("neg dentry 0x%p name = %s",
	522	direntry, direntry->d_name.name));
	523	if(time_after(jiffies, direntry->d_time + HZ) \|\|
	524	!lookupCacheEnabled) {
	525	d_drop(direntry);
	526	isValid = 0;
	527	}
1da177e4 LT	528	}
1da177e4 LT	529
1da177e4 LT	530	return isValid;
	531	}
	532
	533	/* static int cifs_d_delete(struct dentry *direntry)
	534	{
	535	int rc = 0;
	536
	537	cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
	538
	539	return rc;
	540	} */
	541
	542	struct dentry_operations cifs_dentry_ops = {
	543	.d_revalidate = cifs_d_revalidate,
	544	/* d_delete: cifs_d_delete, // not needed except for debugging */
	545	/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
	546	};
b92327fe SF	547
	548	static int cifs_ci_hash(struct dentry dentry, struct qstr q)
	549	{
	550	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	551	unsigned long hash;
	552	int i;
	553
	554	hash = init_name_hash();
	555	for (i = 0; i < q->len; i++)
	556	hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
	557	hash);
	558	q->hash = end_name_hash(hash);
	559
	560	return 0;
	561	}
	562
	563	static int cifs_ci_compare(struct dentry dentry, struct qstr a,
	564	struct qstr *b)
	565	{
	566	struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls;
	567
	568	if ((a->len == b->len) &&
	569	(nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) {
	570	/*
	571	* To preserve case, don't let an existing negative dentry's
	572	* case take precedence. If a is not a negative dentry, this
	573	* should have no side effects
	574	*/
	575	memcpy((unsigned char *)a->name, b->name, a->len);
	576	return 0;
	577	}
	578	return 1;
	579	}
	580
	581	struct dentry_operations cifs_ci_dentry_ops = {
	582	.d_revalidate = cifs_d_revalidate,
	583	.d_hash = cifs_ci_hash,
	584	.d_compare = cifs_ci_compare,
	585	};