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e77e6f3be9
session when multiply mounted. Fixes slow response when cifs client is mounted to shares on multiple servers and oplock break occurs (usually due to attempt to multiply open a file). When treeids on mutiple mounted shares match and we find the wrong match first, we searched for the wrong cached files to send oplock break response for which usually meant that no matching file was found and thus the server would have to timeout the notification. Oplock break timeout is about 20 seconds on some servers so this could cause significantly slower performance on file open calls in a few cases (in particular when multiple shares are mounted from multiple servers, tree ids match, and we have a cached file which is later opened multiple times). This was the most important of the bugs that was found and fixed at Connectathon (interoperability testing event) this week. Acked-by: Shaggy (shaggy@austin.ibm.com) Signed-off-by: Steve French (sfrench@us.ibm.com)
757 lines
23 KiB
C
757 lines
23 KiB
C
/*
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* fs/cifs/misc.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2005
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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/slab.h>
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#include <linux/ctype.h>
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#include <linux/mempool.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 "smberr.h"
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#include "nterr.h"
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#include "cifs_unicode.h"
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extern mempool_t *cifs_sm_req_poolp;
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extern mempool_t *cifs_req_poolp;
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extern struct task_struct * oplockThread;
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/* The xid serves as a useful identifier for each incoming vfs request,
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in a similar way to the mid which is useful to track each sent smb,
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and CurrentXid can also provide a running counter (although it
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will eventually wrap past zero) of the total vfs operations handled
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since the cifs fs was mounted */
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unsigned int
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_GetXid(void)
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{
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unsigned int xid;
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spin_lock(&GlobalMid_Lock);
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GlobalTotalActiveXid++;
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if (GlobalTotalActiveXid > GlobalMaxActiveXid)
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GlobalMaxActiveXid = GlobalTotalActiveXid; /* keep high water mark for number of simultaneous vfs ops in our filesystem */
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if(GlobalTotalActiveXid > 65000)
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cFYI(1,("warning: more than 65000 requests active"));
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xid = GlobalCurrentXid++;
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spin_unlock(&GlobalMid_Lock);
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return xid;
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}
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void
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_FreeXid(unsigned int xid)
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{
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spin_lock(&GlobalMid_Lock);
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/* if(GlobalTotalActiveXid == 0)
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BUG(); */
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GlobalTotalActiveXid--;
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spin_unlock(&GlobalMid_Lock);
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}
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struct cifsSesInfo *
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sesInfoAlloc(void)
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{
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struct cifsSesInfo *ret_buf;
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ret_buf =
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(struct cifsSesInfo *) kzalloc(sizeof (struct cifsSesInfo),
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GFP_KERNEL);
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if (ret_buf) {
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write_lock(&GlobalSMBSeslock);
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atomic_inc(&sesInfoAllocCount);
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ret_buf->status = CifsNew;
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list_add(&ret_buf->cifsSessionList, &GlobalSMBSessionList);
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init_MUTEX(&ret_buf->sesSem);
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write_unlock(&GlobalSMBSeslock);
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}
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return ret_buf;
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}
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void
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sesInfoFree(struct cifsSesInfo *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cFYI(1, ("Null buffer passed to sesInfoFree"));
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return;
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}
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write_lock(&GlobalSMBSeslock);
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atomic_dec(&sesInfoAllocCount);
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list_del(&buf_to_free->cifsSessionList);
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write_unlock(&GlobalSMBSeslock);
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kfree(buf_to_free->serverOS);
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kfree(buf_to_free->serverDomain);
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kfree(buf_to_free->serverNOS);
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kfree(buf_to_free->password);
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kfree(buf_to_free);
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}
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struct cifsTconInfo *
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tconInfoAlloc(void)
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{
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struct cifsTconInfo *ret_buf;
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ret_buf =
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(struct cifsTconInfo *) kzalloc(sizeof (struct cifsTconInfo),
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GFP_KERNEL);
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if (ret_buf) {
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write_lock(&GlobalSMBSeslock);
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atomic_inc(&tconInfoAllocCount);
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list_add(&ret_buf->cifsConnectionList,
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&GlobalTreeConnectionList);
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ret_buf->tidStatus = CifsNew;
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INIT_LIST_HEAD(&ret_buf->openFileList);
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init_MUTEX(&ret_buf->tconSem);
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#ifdef CONFIG_CIFS_STATS
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spin_lock_init(&ret_buf->stat_lock);
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#endif
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write_unlock(&GlobalSMBSeslock);
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}
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return ret_buf;
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}
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void
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tconInfoFree(struct cifsTconInfo *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cFYI(1, ("Null buffer passed to tconInfoFree"));
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return;
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}
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write_lock(&GlobalSMBSeslock);
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atomic_dec(&tconInfoAllocCount);
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list_del(&buf_to_free->cifsConnectionList);
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write_unlock(&GlobalSMBSeslock);
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kfree(buf_to_free->nativeFileSystem);
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kfree(buf_to_free);
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}
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struct smb_hdr *
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cifs_buf_get(void)
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{
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struct smb_hdr *ret_buf = NULL;
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/* We could use negotiated size instead of max_msgsize -
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but it may be more efficient to always alloc same size
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albeit slightly larger than necessary and maxbuffersize
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defaults to this and can not be bigger */
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ret_buf =
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(struct smb_hdr *) mempool_alloc(cifs_req_poolp, SLAB_KERNEL | SLAB_NOFS);
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/* clear the first few header bytes */
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/* for most paths, more is cleared in header_assemble */
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if (ret_buf) {
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memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
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atomic_inc(&bufAllocCount);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&totBufAllocCount);
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#endif /* CONFIG_CIFS_STATS2 */
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}
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return ret_buf;
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}
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void
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cifs_buf_release(void *buf_to_free)
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{
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if (buf_to_free == NULL) {
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/* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
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return;
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}
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mempool_free(buf_to_free,cifs_req_poolp);
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atomic_dec(&bufAllocCount);
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return;
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}
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struct smb_hdr *
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cifs_small_buf_get(void)
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{
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struct smb_hdr *ret_buf = NULL;
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/* We could use negotiated size instead of max_msgsize -
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but it may be more efficient to always alloc same size
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albeit slightly larger than necessary and maxbuffersize
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defaults to this and can not be bigger */
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ret_buf =
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(struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp, SLAB_KERNEL | SLAB_NOFS);
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if (ret_buf) {
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/* No need to clear memory here, cleared in header assemble */
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/* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
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atomic_inc(&smBufAllocCount);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&totSmBufAllocCount);
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#endif /* CONFIG_CIFS_STATS2 */
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}
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return ret_buf;
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}
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void
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cifs_small_buf_release(void *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
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return;
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}
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mempool_free(buf_to_free,cifs_sm_req_poolp);
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atomic_dec(&smBufAllocCount);
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return;
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}
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/*
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Find a free multiplex id (SMB mid). Otherwise there could be
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mid collisions which might cause problems, demultiplexing the
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wrong response to this request. Multiplex ids could collide if
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one of a series requests takes much longer than the others, or
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if a very large number of long lived requests (byte range
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locks or FindNotify requests) are pending. No more than
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64K-1 requests can be outstanding at one time. If no
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mids are available, return zero. A future optimization
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could make the combination of mids and uid the key we use
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to demultiplex on (rather than mid alone).
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In addition to the above check, the cifs demultiplex
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code already used the command code as a secondary
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check of the frame and if signing is negotiated the
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response would be discarded if the mid were the same
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but the signature was wrong. Since the mid is not put in the
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pending queue until later (when it is about to be dispatched)
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we do have to limit the number of outstanding requests
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to somewhat less than 64K-1 although it is hard to imagine
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so many threads being in the vfs at one time.
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*/
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__u16 GetNextMid(struct TCP_Server_Info *server)
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{
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__u16 mid = 0;
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__u16 last_mid;
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int collision;
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if(server == NULL)
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return mid;
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spin_lock(&GlobalMid_Lock);
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last_mid = server->CurrentMid; /* we do not want to loop forever */
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server->CurrentMid++;
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/* This nested loop looks more expensive than it is.
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In practice the list of pending requests is short,
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fewer than 50, and the mids are likely to be unique
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on the first pass through the loop unless some request
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takes longer than the 64 thousand requests before it
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(and it would also have to have been a request that
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did not time out) */
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while(server->CurrentMid != last_mid) {
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struct list_head *tmp;
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struct mid_q_entry *mid_entry;
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collision = 0;
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if(server->CurrentMid == 0)
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server->CurrentMid++;
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list_for_each(tmp, &server->pending_mid_q) {
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mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
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if ((mid_entry->mid == server->CurrentMid) &&
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(mid_entry->midState == MID_REQUEST_SUBMITTED)) {
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/* This mid is in use, try a different one */
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collision = 1;
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break;
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}
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}
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if(collision == 0) {
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mid = server->CurrentMid;
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break;
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}
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server->CurrentMid++;
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}
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spin_unlock(&GlobalMid_Lock);
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return mid;
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}
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/* NB: MID can not be set if treeCon not passed in, in that
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case it is responsbility of caller to set the mid */
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void
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header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
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const struct cifsTconInfo *treeCon, int word_count
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/* length of fixed section (word count) in two byte units */)
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{
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struct list_head* temp_item;
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struct cifsSesInfo * ses;
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char *temp = (char *) buffer;
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memset(temp,0,256); /* bigger than MAX_CIFS_HDR_SIZE */
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buffer->smb_buf_length =
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(2 * word_count) + sizeof (struct smb_hdr) -
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4 /* RFC 1001 length field does not count */ +
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2 /* for bcc field itself */ ;
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/* Note that this is the only network field that has to be converted
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to big endian and it is done just before we send it */
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buffer->Protocol[0] = 0xFF;
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buffer->Protocol[1] = 'S';
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buffer->Protocol[2] = 'M';
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buffer->Protocol[3] = 'B';
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buffer->Command = smb_command;
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buffer->Flags = 0x00; /* case sensitive */
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buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
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buffer->Pid = cpu_to_le16((__u16)current->tgid);
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buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
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spin_lock(&GlobalMid_Lock);
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spin_unlock(&GlobalMid_Lock);
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if (treeCon) {
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buffer->Tid = treeCon->tid;
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if (treeCon->ses) {
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if (treeCon->ses->capabilities & CAP_UNICODE)
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buffer->Flags2 |= SMBFLG2_UNICODE;
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if (treeCon->ses->capabilities & CAP_STATUS32) {
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buffer->Flags2 |= SMBFLG2_ERR_STATUS;
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}
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/* Uid is not converted */
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buffer->Uid = treeCon->ses->Suid;
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buffer->Mid = GetNextMid(treeCon->ses->server);
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if(multiuser_mount != 0) {
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/* For the multiuser case, there are few obvious technically */
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/* possible mechanisms to match the local linux user (uid) */
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/* to a valid remote smb user (smb_uid): */
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/* 1) Query Winbind (or other local pam/nss daemon */
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/* for userid/password/logon_domain or credential */
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/* 2) Query Winbind for uid to sid to username mapping */
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/* and see if we have a matching password for existing*/
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/* session for that user perhas getting password by */
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/* adding a new pam_cifs module that stores passwords */
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/* so that the cifs vfs can get at that for all logged*/
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/* on users */
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/* 3) (Which is the mechanism we have chosen) */
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/* Search through sessions to the same server for a */
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/* a match on the uid that was passed in on mount */
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/* with the current processes uid (or euid?) and use */
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/* that smb uid. If no existing smb session for */
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/* that uid found, use the default smb session ie */
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/* the smb session for the volume mounted which is */
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/* the same as would be used if the multiuser mount */
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/* flag were disabled. */
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/* BB Add support for establishing new tCon and SMB Session */
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/* with userid/password pairs found on the smb session */
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/* for other target tcp/ip addresses BB */
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if(current->fsuid != treeCon->ses->linux_uid) {
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cFYI(1,("Multiuser mode and UID did not match tcon uid"));
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read_lock(&GlobalSMBSeslock);
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list_for_each(temp_item, &GlobalSMBSessionList) {
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ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);
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if(ses->linux_uid == current->fsuid) {
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if(ses->server == treeCon->ses->server) {
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cFYI(1,("found matching uid substitute right smb_uid"));
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buffer->Uid = ses->Suid;
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break;
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} else {
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/* BB eventually call cifs_setup_session here */
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cFYI(1,("local UID found but smb sess with this server does not exist"));
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}
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}
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}
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read_unlock(&GlobalSMBSeslock);
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}
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}
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}
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if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
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buffer->Flags2 |= SMBFLG2_DFS;
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if (treeCon->nocase)
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buffer->Flags |= SMBFLG_CASELESS;
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if((treeCon->ses) && (treeCon->ses->server))
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if(treeCon->ses->server->secMode &
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(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
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buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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}
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/* endian conversion of flags is now done just before sending */
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buffer->WordCount = (char) word_count;
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return;
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}
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int
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checkSMBhdr(struct smb_hdr *smb, __u16 mid)
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{
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/* Make sure that this really is an SMB, that it is a response,
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and that the message ids match */
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if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&
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(mid == smb->Mid)) {
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if(smb->Flags & SMBFLG_RESPONSE)
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return 0;
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else {
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/* only one valid case where server sends us request */
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if(smb->Command == SMB_COM_LOCKING_ANDX)
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return 0;
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else
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cERROR(1, ("Rcvd Request not response"));
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}
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} else { /* bad signature or mid */
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if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
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cERROR(1,
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("Bad protocol string signature header %x",
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*(unsigned int *) smb->Protocol));
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if (mid != smb->Mid)
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cERROR(1, ("Mids do not match"));
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}
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cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));
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return 1;
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}
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int
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checkSMB(struct smb_hdr *smb, __u16 mid, int length)
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{
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__u32 len = smb->smb_buf_length;
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__u32 clc_len; /* calculated length */
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cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));
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if (((unsigned int)length < 2 + sizeof (struct smb_hdr)) ||
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(len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)) {
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if ((unsigned int)length < 2 + sizeof (struct smb_hdr)) {
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if (((unsigned int)length >=
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sizeof (struct smb_hdr) - 1)
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&& (smb->Status.CifsError != 0)) {
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smb->WordCount = 0;
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/* some error cases do not return wct and bcc */
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return 0;
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} else {
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cERROR(1, ("Length less than smb header size"));
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}
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}
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if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
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cERROR(1, ("smb length greater than MaxBufSize, mid=%d",
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smb->Mid));
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return 1;
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}
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if (checkSMBhdr(smb, mid))
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return 1;
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clc_len = smbCalcSize_LE(smb);
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if(4 + len != (unsigned int)length) {
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cERROR(1, ("Length read does not match RFC1001 length %d",len));
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return 1;
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}
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if (4 + len != clc_len) {
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/* check if bcc wrapped around for large read responses */
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if((len > 64 * 1024) && (len > clc_len)) {
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/* check if lengths match mod 64K */
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if(((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))
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return 0; /* bcc wrapped */
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}
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cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",
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clc_len, 4 + len, smb->Mid));
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/* Windows XP can return a few bytes too much, presumably
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an illegal pad, at the end of byte range lock responses
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so we allow for that three byte pad, as long as actual
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received length is as long or longer than calculated length */
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/* We have now had to extend this more, since there is a
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case in which it needs to be bigger still to handle a
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malformed response to transact2 findfirst from WinXP when
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access denied is returned and thus bcc and wct are zero
|
|
but server says length is 0x21 bytes too long as if the server
|
|
forget to reset the smb rfc1001 length when it reset the
|
|
wct and bcc to minimum size and drop the t2 parms and data */
|
|
if((4+len > clc_len) && (len <= clc_len + 512))
|
|
return 0;
|
|
else {
|
|
cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",
|
|
len, smb->Mid));
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
int
|
|
is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
|
|
{
|
|
struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)buf;
|
|
struct list_head *tmp;
|
|
struct list_head *tmp1;
|
|
struct cifsTconInfo *tcon;
|
|
struct cifsFileInfo *netfile;
|
|
|
|
cFYI(1,("Checking for oplock break or dnotify response"));
|
|
if((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
|
|
(pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
|
|
struct smb_com_transaction_change_notify_rsp * pSMBr =
|
|
(struct smb_com_transaction_change_notify_rsp *)buf;
|
|
struct file_notify_information * pnotify;
|
|
__u32 data_offset = 0;
|
|
if(pSMBr->ByteCount > sizeof(struct file_notify_information)) {
|
|
data_offset = le32_to_cpu(pSMBr->DataOffset);
|
|
|
|
pnotify = (struct file_notify_information *)((char *)&pSMBr->hdr.Protocol
|
|
+ data_offset);
|
|
cFYI(1,("dnotify on %s with action: 0x%x",pnotify->FileName,
|
|
pnotify->Action)); /* BB removeme BB */
|
|
/* cifs_dump_mem("Received notify Data is: ",buf,sizeof(struct smb_hdr)+60); */
|
|
return TRUE;
|
|
}
|
|
if(pSMBr->hdr.Status.CifsError) {
|
|
cFYI(1,("notify err 0x%d",pSMBr->hdr.Status.CifsError));
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
if(pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
|
|
return FALSE;
|
|
if(pSMB->hdr.Flags & SMBFLG_RESPONSE) {
|
|
/* no sense logging error on invalid handle on oplock
|
|
break - harmless race between close request and oplock
|
|
break response is expected from time to time writing out
|
|
large dirty files cached on the client */
|
|
if ((NT_STATUS_INVALID_HANDLE) ==
|
|
le32_to_cpu(pSMB->hdr.Status.CifsError)) {
|
|
cFYI(1,("invalid handle on oplock break"));
|
|
return TRUE;
|
|
} else if (ERRbadfid ==
|
|
le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
|
|
return TRUE;
|
|
} else {
|
|
return FALSE; /* on valid oplock brk we get "request" */
|
|
}
|
|
}
|
|
if(pSMB->hdr.WordCount != 8)
|
|
return FALSE;
|
|
|
|
cFYI(1,(" oplock type 0x%d level 0x%d",pSMB->LockType,pSMB->OplockLevel));
|
|
if(!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
|
|
return FALSE;
|
|
|
|
/* look up tcon based on tid & uid */
|
|
read_lock(&GlobalSMBSeslock);
|
|
list_for_each(tmp, &GlobalTreeConnectionList) {
|
|
tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
|
|
if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) {
|
|
cifs_stats_inc(&tcon->num_oplock_brks);
|
|
list_for_each(tmp1,&tcon->openFileList){
|
|
netfile = list_entry(tmp1,struct cifsFileInfo,
|
|
tlist);
|
|
if(pSMB->Fid == netfile->netfid) {
|
|
struct cifsInodeInfo *pCifsInode;
|
|
read_unlock(&GlobalSMBSeslock);
|
|
cFYI(1,("file id match, oplock break"));
|
|
pCifsInode =
|
|
CIFS_I(netfile->pInode);
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
|
if(pSMB->OplockLevel == 0)
|
|
pCifsInode->clientCanCacheRead
|
|
= FALSE;
|
|
pCifsInode->oplockPending = TRUE;
|
|
AllocOplockQEntry(netfile->pInode,
|
|
netfile->netfid,
|
|
tcon);
|
|
cFYI(1,("about to wake up oplock thd"));
|
|
if(oplockThread)
|
|
wake_up_process(oplockThread);
|
|
return TRUE;
|
|
}
|
|
}
|
|
read_unlock(&GlobalSMBSeslock);
|
|
cFYI(1,("No matching file for oplock break"));
|
|
return TRUE;
|
|
}
|
|
}
|
|
read_unlock(&GlobalSMBSeslock);
|
|
cFYI(1,("Can not process oplock break for non-existent connection"));
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
|
|
{
|
|
int i, j;
|
|
char debug_line[17];
|
|
unsigned char *buffer;
|
|
|
|
if (traceSMB == 0)
|
|
return;
|
|
|
|
buffer = (unsigned char *) smb_buf;
|
|
for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
|
|
if (i % 8 == 0) { /* have reached the beginning of line */
|
|
printk(KERN_DEBUG "| ");
|
|
j = 0;
|
|
}
|
|
printk("%0#4x ", buffer[i]);
|
|
debug_line[2 * j] = ' ';
|
|
if (isprint(buffer[i]))
|
|
debug_line[1 + (2 * j)] = buffer[i];
|
|
else
|
|
debug_line[1 + (2 * j)] = '_';
|
|
|
|
if (i % 8 == 7) { /* reached end of line, time to print ascii */
|
|
debug_line[16] = 0;
|
|
printk(" | %s\n", debug_line);
|
|
}
|
|
}
|
|
for (; j < 8; j++) {
|
|
printk(" ");
|
|
debug_line[2 * j] = ' ';
|
|
debug_line[1 + (2 * j)] = ' ';
|
|
}
|
|
printk( " | %s\n", debug_line);
|
|
return;
|
|
}
|
|
|
|
/* Windows maps these to the user defined 16 bit Unicode range since they are
|
|
reserved symbols (along with \ and /), otherwise illegal to store
|
|
in filenames in NTFS */
|
|
#define UNI_ASTERIK (__u16) ('*' + 0xF000)
|
|
#define UNI_QUESTION (__u16) ('?' + 0xF000)
|
|
#define UNI_COLON (__u16) (':' + 0xF000)
|
|
#define UNI_GRTRTHAN (__u16) ('>' + 0xF000)
|
|
#define UNI_LESSTHAN (__u16) ('<' + 0xF000)
|
|
#define UNI_PIPE (__u16) ('|' + 0xF000)
|
|
#define UNI_SLASH (__u16) ('\\' + 0xF000)
|
|
|
|
/* Convert 16 bit Unicode pathname from wire format to string in current code
|
|
page. Conversion may involve remapping up the seven characters that are
|
|
only legal in POSIX-like OS (if they are present in the string). Path
|
|
names are little endian 16 bit Unicode on the wire */
|
|
int
|
|
cifs_convertUCSpath(char *target, const __le16 * source, int maxlen,
|
|
const struct nls_table * cp)
|
|
{
|
|
int i,j,len;
|
|
__u16 src_char;
|
|
|
|
for(i = 0, j = 0; i < maxlen; i++) {
|
|
src_char = le16_to_cpu(source[i]);
|
|
switch (src_char) {
|
|
case 0:
|
|
goto cUCS_out; /* BB check this BB */
|
|
case UNI_COLON:
|
|
target[j] = ':';
|
|
break;
|
|
case UNI_ASTERIK:
|
|
target[j] = '*';
|
|
break;
|
|
case UNI_QUESTION:
|
|
target[j] = '?';
|
|
break;
|
|
/* BB We can not handle remapping slash until
|
|
all the calls to build_path_from_dentry
|
|
are modified, as they use slash as separator BB */
|
|
/* case UNI_SLASH:
|
|
target[j] = '\\';
|
|
break;*/
|
|
case UNI_PIPE:
|
|
target[j] = '|';
|
|
break;
|
|
case UNI_GRTRTHAN:
|
|
target[j] = '>';
|
|
break;
|
|
case UNI_LESSTHAN:
|
|
target[j] = '<';
|
|
break;
|
|
default:
|
|
len = cp->uni2char(src_char, &target[j],
|
|
NLS_MAX_CHARSET_SIZE);
|
|
if(len > 0) {
|
|
j += len;
|
|
continue;
|
|
} else {
|
|
target[j] = '?';
|
|
}
|
|
}
|
|
j++;
|
|
/* make sure we do not overrun callers allocated temp buffer */
|
|
if(j >= (2 * NAME_MAX))
|
|
break;
|
|
}
|
|
cUCS_out:
|
|
target[j] = 0;
|
|
return j;
|
|
}
|
|
|
|
/* Convert 16 bit Unicode pathname to wire format from string in current code
|
|
page. Conversion may involve remapping up the seven characters that are
|
|
only legal in POSIX-like OS (if they are present in the string). Path
|
|
names are little endian 16 bit Unicode on the wire */
|
|
int
|
|
cifsConvertToUCS(__le16 * target, const char *source, int maxlen,
|
|
const struct nls_table * cp, int mapChars)
|
|
{
|
|
int i,j,charlen;
|
|
int len_remaining = maxlen;
|
|
char src_char;
|
|
__u16 temp;
|
|
|
|
if(!mapChars)
|
|
return cifs_strtoUCS(target, source, PATH_MAX, cp);
|
|
|
|
for(i = 0, j = 0; i < maxlen; j++) {
|
|
src_char = source[i];
|
|
switch (src_char) {
|
|
case 0:
|
|
target[j] = 0;
|
|
goto ctoUCS_out;
|
|
case ':':
|
|
target[j] = cpu_to_le16(UNI_COLON);
|
|
break;
|
|
case '*':
|
|
target[j] = cpu_to_le16(UNI_ASTERIK);
|
|
break;
|
|
case '?':
|
|
target[j] = cpu_to_le16(UNI_QUESTION);
|
|
break;
|
|
case '<':
|
|
target[j] = cpu_to_le16(UNI_LESSTHAN);
|
|
break;
|
|
case '>':
|
|
target[j] = cpu_to_le16(UNI_GRTRTHAN);
|
|
break;
|
|
case '|':
|
|
target[j] = cpu_to_le16(UNI_PIPE);
|
|
break;
|
|
/* BB We can not handle remapping slash until
|
|
all the calls to build_path_from_dentry
|
|
are modified, as they use slash as separator BB */
|
|
/* case '\\':
|
|
target[j] = cpu_to_le16(UNI_SLASH);
|
|
break;*/
|
|
default:
|
|
charlen = cp->char2uni(source+i,
|
|
len_remaining, &temp);
|
|
/* if no match, use question mark, which
|
|
at least in some cases servers as wild card */
|
|
if(charlen < 1) {
|
|
target[j] = cpu_to_le16(0x003f);
|
|
charlen = 1;
|
|
} else
|
|
target[j] = cpu_to_le16(temp);
|
|
len_remaining -= charlen;
|
|
/* character may take more than one byte in the
|
|
the source string, but will take exactly two
|
|
bytes in the target string */
|
|
i+= charlen;
|
|
continue;
|
|
}
|
|
i++; /* move to next char in source string */
|
|
len_remaining--;
|
|
}
|
|
|
|
ctoUCS_out:
|
|
return i;
|
|
}
|