![Miklos Szeredi](/assets/img/avatar_default.png)
cifs_create() did totally the wrong thing with nd->intent.open.flags: it interpreted nd->intent.open.flags as the original open flags, not the one transformed for open_namei(). Also it used the intent data even if it was not filled in (if called from sys_mknod()). Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Cc: <viro@parcelfarce.linux.theplanet.co.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Steven French <sfrench@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
443 lines
12 KiB
C
443 lines
12 KiB
C
/*
|
|
* fs/cifs/dir.c
|
|
*
|
|
* vfs operations that deal with dentries
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2002,2003
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
|
*
|
|
* This library is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published
|
|
* by the Free Software Foundation; either version 2.1 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
* the GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/namei.h>
|
|
#include "cifsfs.h"
|
|
#include "cifspdu.h"
|
|
#include "cifsglob.h"
|
|
#include "cifsproto.h"
|
|
#include "cifs_debug.h"
|
|
#include "cifs_fs_sb.h"
|
|
|
|
void
|
|
renew_parental_timestamps(struct dentry *direntry)
|
|
{
|
|
/* BB check if there is a way to get the kernel to do this or if we really need this */
|
|
do {
|
|
direntry->d_time = jiffies;
|
|
direntry = direntry->d_parent;
|
|
} while (!IS_ROOT(direntry));
|
|
}
|
|
|
|
/* Note: caller must free return buffer */
|
|
char *
|
|
build_path_from_dentry(struct dentry *direntry)
|
|
{
|
|
struct dentry *temp;
|
|
int namelen = 0;
|
|
char *full_path;
|
|
|
|
if(direntry == NULL)
|
|
return NULL; /* not much we can do if dentry is freed and
|
|
we need to reopen the file after it was closed implicitly
|
|
when the server crashed */
|
|
|
|
cifs_bp_rename_retry:
|
|
for (temp = direntry; !IS_ROOT(temp);) {
|
|
namelen += (1 + temp->d_name.len);
|
|
temp = temp->d_parent;
|
|
if(temp == NULL) {
|
|
cERROR(1,("corrupt dentry"));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
full_path = kmalloc(namelen+1, GFP_KERNEL);
|
|
if(full_path == NULL)
|
|
return full_path;
|
|
full_path[namelen] = 0; /* trailing null */
|
|
|
|
for (temp = direntry; !IS_ROOT(temp);) {
|
|
namelen -= 1 + temp->d_name.len;
|
|
if (namelen < 0) {
|
|
break;
|
|
} else {
|
|
full_path[namelen] = '\\';
|
|
strncpy(full_path + namelen + 1, temp->d_name.name,
|
|
temp->d_name.len);
|
|
cFYI(0, (" name: %s ", full_path + namelen));
|
|
}
|
|
temp = temp->d_parent;
|
|
if(temp == NULL) {
|
|
cERROR(1,("corrupt dentry"));
|
|
kfree(full_path);
|
|
return NULL;
|
|
}
|
|
}
|
|
if (namelen != 0) {
|
|
cERROR(1,
|
|
("We did not end path lookup where we expected namelen is %d",
|
|
namelen));
|
|
/* presumably this is only possible if we were racing with a rename
|
|
of one of the parent directories (we can not lock the dentries
|
|
above us to prevent this, but retrying should be harmless) */
|
|
kfree(full_path);
|
|
namelen = 0;
|
|
goto cifs_bp_rename_retry;
|
|
}
|
|
|
|
return full_path;
|
|
}
|
|
|
|
/* 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) {
|
|
cFYI(1, ("cifs_create returned 0x%x ", rc));
|
|
} else {
|
|
/* If Open reported that we actually created a file
|
|
then we now have to set the mode if possible */
|
|
if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
|
|
(oplock & CIFS_CREATE_ACTION))
|
|
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
|
|
CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
|
|
(__u64)current->euid,
|
|
(__u64)current->egid,
|
|
0 /* dev */,
|
|
cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
} else {
|
|
CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
|
|
(__u64)-1,
|
|
(__u64)-1,
|
|
0 /* dev */,
|
|
cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
}
|
|
else {
|
|
/* BB implement via Windows security descriptors */
|
|
/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
|
|
/* could set r/o dos attribute if mode & 0222 == 0 */
|
|
}
|
|
|
|
/* BB server might mask mode so we have to query for Unix case*/
|
|
if (pTcon->ses->capabilities & CAP_UNIX)
|
|
rc = cifs_get_inode_info_unix(&newinode, full_path,
|
|
inode->i_sb,xid);
|
|
else {
|
|
rc = cifs_get_inode_info(&newinode, full_path,
|
|
buf, inode->i_sb,xid);
|
|
if(newinode)
|
|
newinode->i_mode = mode;
|
|
}
|
|
|
|
if (rc != 0) {
|
|
cFYI(1,("Create worked but get_inode_info failed with rc = %d",
|
|
rc));
|
|
} else {
|
|
direntry->d_op = &cifs_dentry_ops;
|
|
d_instantiate(direntry, newinode);
|
|
}
|
|
if((nd->flags & LOOKUP_OPEN) == FALSE) {
|
|
/* mknod case - do not leave file open */
|
|
CIFSSMBClose(xid, pTcon, fileHandle);
|
|
} else if(newinode) {
|
|
pCifsFile =
|
|
kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
|
|
|
|
if(pCifsFile == NULL)
|
|
goto cifs_create_out;
|
|
memset((char *)pCifsFile, 0,
|
|
sizeof (struct cifsFileInfo));
|
|
pCifsFile->netfid = fileHandle;
|
|
pCifsFile->pid = current->tgid;
|
|
pCifsFile->pInode = newinode;
|
|
pCifsFile->invalidHandle = FALSE;
|
|
pCifsFile->closePend = FALSE;
|
|
init_MUTEX(&pCifsFile->fh_sem);
|
|
/* set the following in open now
|
|
pCifsFile->pfile = file; */
|
|
write_lock(&GlobalSMBSeslock);
|
|
list_add(&pCifsFile->tlist,&pTcon->openFileList);
|
|
pCifsInode = CIFS_I(newinode);
|
|
if(pCifsInode) {
|
|
/* if readable file instance put first in list*/
|
|
if (write_only == TRUE) {
|
|
list_add_tail(&pCifsFile->flist,
|
|
&pCifsInode->openFileList);
|
|
} else {
|
|
list_add(&pCifsFile->flist,
|
|
&pCifsInode->openFileList);
|
|
}
|
|
if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
|
|
pCifsInode->clientCanCacheAll = TRUE;
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
|
cFYI(1,("Exclusive Oplock for inode %p",
|
|
newinode));
|
|
} else if((oplock & 0xF) == OPLOCK_READ)
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
|
}
|
|
write_unlock(&GlobalSMBSeslock);
|
|
}
|
|
}
|
|
cifs_create_out:
|
|
kfree(buf);
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t device_number)
|
|
{
|
|
int rc = -EPERM;
|
|
int xid;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
char *full_path = NULL;
|
|
struct inode * newinode = NULL;
|
|
|
|
if (!old_valid_dev(device_number))
|
|
return -EINVAL;
|
|
|
|
xid = GetXid();
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
down(&direntry->d_sb->s_vfs_rename_sem);
|
|
full_path = build_path_from_dentry(direntry);
|
|
up(&direntry->d_sb->s_vfs_rename_sem);
|
|
if(full_path == NULL)
|
|
rc = -ENOMEM;
|
|
|
|
if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
|
|
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
|
|
rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
|
|
mode,(__u64)current->euid,(__u64)current->egid,
|
|
device_number, cifs_sb->local_nls,
|
|
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);
|
|
direntry->d_op = &cifs_dentry_ops;
|
|
if(rc == 0)
|
|
d_instantiate(direntry, newinode);
|
|
}
|
|
}
|
|
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
|
|
struct dentry *
|
|
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
|
|
{
|
|
int xid;
|
|
int rc = 0; /* to get around spurious gcc warning, set to zero here */
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
struct inode *newInode = NULL;
|
|
char *full_path = NULL;
|
|
|
|
xid = GetXid();
|
|
|
|
cFYI(1,
|
|
(" parent inode = 0x%p name is: %s and dentry = 0x%p",
|
|
parent_dir_inode, direntry->d_name.name, direntry));
|
|
|
|
/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
|
|
|
|
/* check whether path exists */
|
|
|
|
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
/* can not grab the rename sem here since it would
|
|
deadlock in the cases (beginning of sys_rename itself)
|
|
in which we already have the sb rename sem */
|
|
full_path = build_path_from_dentry(direntry);
|
|
if(full_path == NULL) {
|
|
FreeXid(xid);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
if (direntry->d_inode != NULL) {
|
|
cFYI(1, (" non-NULL inode in lookup"));
|
|
} else {
|
|
cFYI(1, (" NULL inode in lookup"));
|
|
}
|
|
cFYI(1,
|
|
(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
|
|
|
|
if (pTcon->ses->capabilities & CAP_UNIX)
|
|
rc = cifs_get_inode_info_unix(&newInode, full_path,
|
|
parent_dir_inode->i_sb,xid);
|
|
else
|
|
rc = cifs_get_inode_info(&newInode, full_path, NULL,
|
|
parent_dir_inode->i_sb,xid);
|
|
|
|
if ((rc == 0) && (newInode != NULL)) {
|
|
direntry->d_op = &cifs_dentry_ops;
|
|
d_add(direntry, newInode);
|
|
|
|
/* since paths are not looked up by component - the parent directories are presumed to be good here */
|
|
renew_parental_timestamps(direntry);
|
|
|
|
} else if (rc == -ENOENT) {
|
|
rc = 0;
|
|
d_add(direntry, NULL);
|
|
} else {
|
|
cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
|
|
rc,full_path));
|
|
/* BB special case check for Access Denied - watch security
|
|
exposure of returning dir info implicitly via different rc
|
|
if file exists or not but no access BB */
|
|
}
|
|
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static int
|
|
cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
|
|
{
|
|
int isValid = 1;
|
|
|
|
/* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */
|
|
|
|
if (direntry->d_inode) {
|
|
if (cifs_revalidate(direntry)) {
|
|
/* unlock_kernel(); */
|
|
return 0;
|
|
}
|
|
} else {
|
|
cFYI(1,
|
|
("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
|
|
direntry->d_name.name, direntry));
|
|
}
|
|
|
|
/* unlock_kernel(); */
|
|
|
|
return isValid;
|
|
}
|
|
|
|
/* static int cifs_d_delete(struct dentry *direntry)
|
|
{
|
|
int rc = 0;
|
|
|
|
cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
|
|
|
|
return rc;
|
|
} */
|
|
|
|
struct dentry_operations cifs_dentry_ops = {
|
|
.d_revalidate = cifs_d_revalidate,
|
|
/* d_delete: cifs_d_delete, *//* not needed except for debugging */
|
|
/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
|
|
};
|