444 строки
12 KiB
C
444 строки
12 KiB
C
/*
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* fs/cifs/dir.c
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*
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* vfs operations that deal with dentries
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*
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* Copyright (C) International Business Machines Corp., 2002,2003
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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void
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renew_parental_timestamps(struct dentry *direntry)
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{
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/* BB check if there is a way to get the kernel to do this or if we really need this */
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do {
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direntry->d_time = jiffies;
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direntry = direntry->d_parent;
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} while (!IS_ROOT(direntry));
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}
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/* Note: caller must free return buffer */
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char *
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build_path_from_dentry(struct dentry *direntry)
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{
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struct dentry *temp;
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int namelen = 0;
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char *full_path;
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if(direntry == NULL)
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return NULL; /* not much we can do if dentry is freed and
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we need to reopen the file after it was closed implicitly
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when the server crashed */
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cifs_bp_rename_retry:
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for (temp = direntry; !IS_ROOT(temp);) {
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namelen += (1 + temp->d_name.len);
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temp = temp->d_parent;
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if(temp == NULL) {
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cERROR(1,("corrupt dentry"));
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return NULL;
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}
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}
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full_path = kmalloc(namelen+1, GFP_KERNEL);
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if(full_path == NULL)
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return full_path;
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full_path[namelen] = 0; /* trailing null */
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for (temp = direntry; !IS_ROOT(temp);) {
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namelen -= 1 + temp->d_name.len;
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if (namelen < 0) {
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break;
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} else {
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full_path[namelen] = '\\';
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strncpy(full_path + namelen + 1, temp->d_name.name,
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temp->d_name.len);
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cFYI(0, (" name: %s ", full_path + namelen));
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}
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temp = temp->d_parent;
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if(temp == NULL) {
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cERROR(1,("corrupt dentry"));
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kfree(full_path);
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return NULL;
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}
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}
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if (namelen != 0) {
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cERROR(1,
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("We did not end path lookup where we expected namelen is %d",
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namelen));
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/* presumably this is only possible if we were racing with a rename
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of one of the parent directories (we can not lock the dentries
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above us to prevent this, but retrying should be harmless) */
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kfree(full_path);
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namelen = 0;
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goto cifs_bp_rename_retry;
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}
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return full_path;
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}
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/* char * build_wildcard_path_from_dentry(struct dentry *direntry)
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{
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if(full_path == NULL)
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return full_path;
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full_path[namelen] = '\\';
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full_path[namelen+1] = '*';
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full_path[namelen+2] = 0;
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BB remove above eight lines BB */
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/* Inode operations in similar order to how they appear in the Linux file fs.h */
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int
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cifs_create(struct inode *inode, struct dentry *direntry, int mode,
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struct nameidata *nd)
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{
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int rc = -ENOENT;
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int xid;
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int oplock = 0;
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int desiredAccess = GENERIC_READ | GENERIC_WRITE;
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__u16 fileHandle;
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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char *full_path = NULL;
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FILE_ALL_INFO * buf = NULL;
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struct inode *newinode = NULL;
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struct cifsFileInfo * pCifsFile = NULL;
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struct cifsInodeInfo * pCifsInode;
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int disposition = FILE_OVERWRITE_IF;
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int write_only = FALSE;
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xid = GetXid();
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cifs_sb = CIFS_SB(inode->i_sb);
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pTcon = cifs_sb->tcon;
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down(&direntry->d_sb->s_vfs_rename_sem);
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full_path = build_path_from_dentry(direntry);
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up(&direntry->d_sb->s_vfs_rename_sem);
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if(full_path == NULL) {
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FreeXid(xid);
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return -ENOMEM;
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}
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if(nd) {
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if ((nd->intent.open.flags & O_ACCMODE) == O_RDONLY)
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desiredAccess = GENERIC_READ;
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else if ((nd->intent.open.flags & O_ACCMODE) == O_WRONLY) {
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desiredAccess = GENERIC_WRITE;
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write_only = TRUE;
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} else if ((nd->intent.open.flags & O_ACCMODE) == O_RDWR) {
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/* GENERIC_ALL is too much permission to request */
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/* can cause unnecessary access denied on create */
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/* desiredAccess = GENERIC_ALL; */
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desiredAccess = GENERIC_READ | GENERIC_WRITE;
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}
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if((nd->intent.open.flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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disposition = FILE_CREATE;
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else if((nd->intent.open.flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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disposition = FILE_OVERWRITE_IF;
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else if((nd->intent.open.flags & O_CREAT) == O_CREAT)
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disposition = FILE_OPEN_IF;
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else {
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cFYI(1,("Create flag not set in create function"));
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}
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}
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/* BB add processing to set equivalent of mode - e.g. via CreateX with ACLs */
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if (oplockEnabled)
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oplock = REQ_OPLOCK;
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buf = kmalloc(sizeof(FILE_ALL_INFO),GFP_KERNEL);
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if(buf == NULL) {
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kfree(full_path);
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FreeXid(xid);
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return -ENOMEM;
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}
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rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
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desiredAccess, CREATE_NOT_DIR,
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&fileHandle, &oplock, buf, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc) {
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cFYI(1, ("cifs_create returned 0x%x ", rc));
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} else {
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/* If Open reported that we actually created a file
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then we now have to set the mode if possible */
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if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
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(oplock & CIFS_CREATE_ACTION))
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if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
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(__u64)current->euid,
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(__u64)current->egid,
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0 /* dev */,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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} else {
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CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
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(__u64)-1,
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(__u64)-1,
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0 /* dev */,
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cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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}
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else {
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/* BB implement via Windows security descriptors */
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/* eg CIFSSMBWinSetPerms(xid,pTcon,full_path,mode,-1,-1,local_nls);*/
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/* could set r/o dos attribute if mode & 0222 == 0 */
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}
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/* BB server might mask mode so we have to query for Unix case*/
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if (pTcon->ses->capabilities & CAP_UNIX)
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rc = cifs_get_inode_info_unix(&newinode, full_path,
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inode->i_sb,xid);
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else {
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rc = cifs_get_inode_info(&newinode, full_path,
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buf, inode->i_sb,xid);
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if(newinode)
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newinode->i_mode = mode;
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}
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if (rc != 0) {
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cFYI(1,("Create worked but get_inode_info failed with rc = %d",
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rc));
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} else {
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direntry->d_op = &cifs_dentry_ops;
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d_instantiate(direntry, newinode);
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}
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if((nd->flags & LOOKUP_OPEN) == FALSE) {
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/* mknod case - do not leave file open */
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CIFSSMBClose(xid, pTcon, fileHandle);
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} else if(newinode) {
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pCifsFile =
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kmalloc(sizeof (struct cifsFileInfo), GFP_KERNEL);
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if(pCifsFile == NULL)
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goto cifs_create_out;
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memset((char *)pCifsFile, 0,
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sizeof (struct cifsFileInfo));
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pCifsFile->netfid = fileHandle;
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pCifsFile->pid = current->tgid;
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pCifsFile->pInode = newinode;
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pCifsFile->invalidHandle = FALSE;
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pCifsFile->closePend = FALSE;
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init_MUTEX(&pCifsFile->fh_sem);
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/* set the following in open now
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pCifsFile->pfile = file; */
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write_lock(&GlobalSMBSeslock);
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list_add(&pCifsFile->tlist,&pTcon->openFileList);
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pCifsInode = CIFS_I(newinode);
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if(pCifsInode) {
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/* if readable file instance put first in list*/
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if (write_only == TRUE) {
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list_add_tail(&pCifsFile->flist,
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&pCifsInode->openFileList);
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} else {
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list_add(&pCifsFile->flist,
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&pCifsInode->openFileList);
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}
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if((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
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pCifsInode->clientCanCacheAll = TRUE;
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pCifsInode->clientCanCacheRead = TRUE;
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cFYI(1,("Exclusive Oplock for inode %p",
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newinode));
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} else if((oplock & 0xF) == OPLOCK_READ)
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pCifsInode->clientCanCacheRead = TRUE;
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}
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write_unlock(&GlobalSMBSeslock);
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}
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}
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cifs_create_out:
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kfree(buf);
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kfree(full_path);
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FreeXid(xid);
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return rc;
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}
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int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t device_number)
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{
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int rc = -EPERM;
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int xid;
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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char *full_path = NULL;
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struct inode * newinode = NULL;
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if (!old_valid_dev(device_number))
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return -EINVAL;
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xid = GetXid();
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cifs_sb = CIFS_SB(inode->i_sb);
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pTcon = cifs_sb->tcon;
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down(&direntry->d_sb->s_vfs_rename_sem);
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full_path = build_path_from_dentry(direntry);
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up(&direntry->d_sb->s_vfs_rename_sem);
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if(full_path == NULL)
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rc = -ENOMEM;
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if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
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if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
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mode,(__u64)current->euid,(__u64)current->egid,
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device_number, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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} else {
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rc = CIFSSMBUnixSetPerms(xid, pTcon,
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full_path, mode, (__u64)-1, (__u64)-1,
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device_number, cifs_sb->local_nls,
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cifs_sb->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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}
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if(!rc) {
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rc = cifs_get_inode_info_unix(&newinode, full_path,
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inode->i_sb,xid);
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direntry->d_op = &cifs_dentry_ops;
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if(rc == 0)
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d_instantiate(direntry, newinode);
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}
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}
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kfree(full_path);
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FreeXid(xid);
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return rc;
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}
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struct dentry *
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cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
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{
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int xid;
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int rc = 0; /* to get around spurious gcc warning, set to zero here */
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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struct inode *newInode = NULL;
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char *full_path = NULL;
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xid = GetXid();
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cFYI(1,
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(" parent inode = 0x%p name is: %s and dentry = 0x%p",
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parent_dir_inode, direntry->d_name.name, direntry));
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/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
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/* check whether path exists */
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cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
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pTcon = cifs_sb->tcon;
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/* can not grab the rename sem here since it would
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deadlock in the cases (beginning of sys_rename itself)
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in which we already have the sb rename sem */
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full_path = build_path_from_dentry(direntry);
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if(full_path == NULL) {
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FreeXid(xid);
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return ERR_PTR(-ENOMEM);
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}
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if (direntry->d_inode != NULL) {
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cFYI(1, (" non-NULL inode in lookup"));
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} else {
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cFYI(1, (" NULL inode in lookup"));
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}
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cFYI(1,
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(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
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if (pTcon->ses->capabilities & CAP_UNIX)
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rc = cifs_get_inode_info_unix(&newInode, full_path,
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parent_dir_inode->i_sb,xid);
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else
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rc = cifs_get_inode_info(&newInode, full_path, NULL,
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parent_dir_inode->i_sb,xid);
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if ((rc == 0) && (newInode != NULL)) {
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direntry->d_op = &cifs_dentry_ops;
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d_add(direntry, newInode);
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/* since paths are not looked up by component - the parent directories are presumed to be good here */
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renew_parental_timestamps(direntry);
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} else if (rc == -ENOENT) {
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rc = 0;
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d_add(direntry, NULL);
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} else {
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cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
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rc,full_path));
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/* BB special case check for Access Denied - watch security
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exposure of returning dir info implicitly via different rc
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if file exists or not but no access BB */
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}
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kfree(full_path);
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FreeXid(xid);
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return ERR_PTR(rc);
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}
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static int
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cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
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{
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int isValid = 1;
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/* lock_kernel(); *//* surely we do not want to lock the kernel for a whole network round trip which could take seconds */
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if (direntry->d_inode) {
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if (cifs_revalidate(direntry)) {
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/* unlock_kernel(); */
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return 0;
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}
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} else {
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cFYI(1,
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("In cifs_d_revalidate with no inode but name = %s and dentry 0x%p",
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direntry->d_name.name, direntry));
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}
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/* unlock_kernel(); */
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return isValid;
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}
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/* static int cifs_d_delete(struct dentry *direntry)
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{
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int rc = 0;
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cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name));
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return rc;
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} */
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struct dentry_operations cifs_dentry_ops = {
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.d_revalidate = cifs_d_revalidate,
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/* d_delete: cifs_d_delete, *//* not needed except for debugging */
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/* no need for d_hash, d_compare, d_release, d_iput ... yet. BB confirm this BB */
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};
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