mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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373512ec5c
Reviewed-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Steve French <steve.french@primarydata.com>
642 lines
18 KiB
C
642 lines
18 KiB
C
/*
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* fs/cifs/misc.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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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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#ifdef CONFIG_CIFS_SMB2
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#include "smb2pdu.h"
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#endif
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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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/* 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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_get_xid(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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/* keep high water mark for number of simultaneous ops in filesystem */
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if (GlobalTotalActiveXid > GlobalMaxActiveXid)
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GlobalMaxActiveXid = GlobalTotalActiveXid;
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if (GlobalTotalActiveXid > 65000)
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cifs_dbg(FYI, "warning: more than 65000 requests active\n");
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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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_free_xid(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 cifs_ses *
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sesInfoAlloc(void)
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{
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struct cifs_ses *ret_buf;
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ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
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if (ret_buf) {
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atomic_inc(&sesInfoAllocCount);
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ret_buf->status = CifsNew;
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++ret_buf->ses_count;
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INIT_LIST_HEAD(&ret_buf->smb_ses_list);
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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mutex_init(&ret_buf->session_mutex);
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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 cifs_ses *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
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return;
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}
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atomic_dec(&sesInfoAllocCount);
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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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if (buf_to_free->password) {
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memset(buf_to_free->password, 0, strlen(buf_to_free->password));
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kfree(buf_to_free->password);
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}
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kfree(buf_to_free->user_name);
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kfree(buf_to_free->domainName);
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kfree(buf_to_free->auth_key.response);
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kfree(buf_to_free);
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}
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struct cifs_tcon *
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tconInfoAlloc(void)
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{
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struct cifs_tcon *ret_buf;
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ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
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if (ret_buf) {
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atomic_inc(&tconInfoAllocCount);
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ret_buf->tidStatus = CifsNew;
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++ret_buf->tc_count;
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INIT_LIST_HEAD(&ret_buf->openFileList);
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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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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}
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return ret_buf;
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}
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void
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tconInfoFree(struct cifs_tcon *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
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return;
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}
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atomic_dec(&tconInfoAllocCount);
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kfree(buf_to_free->nativeFileSystem);
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if (buf_to_free->password) {
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memset(buf_to_free->password, 0, strlen(buf_to_free->password));
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kfree(buf_to_free->password);
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}
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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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size_t buf_size = sizeof(struct smb_hdr);
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#ifdef CONFIG_CIFS_SMB2
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/*
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* SMB2 header is bigger than CIFS one - no problems to clean some
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* more bytes for CIFS.
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*/
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buf_size = sizeof(struct smb2_hdr);
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#endif
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/*
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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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*/
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ret_buf = mempool_alloc(cifs_req_poolp, GFP_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, buf_size + 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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/* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
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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 = mempool_alloc(cifs_sm_req_poolp, GFP_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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cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
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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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void
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free_rsp_buf(int resp_buftype, void *rsp)
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{
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if (resp_buftype == CIFS_SMALL_BUFFER)
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cifs_small_buf_release(rsp);
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else if (resp_buftype == CIFS_LARGE_BUFFER)
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cifs_buf_release(rsp);
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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 cifs_tcon *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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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 = cpu_to_be32(
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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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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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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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/* Uid is not converted */
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buffer->Uid = treeCon->ses->Suid;
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buffer->Mid = get_next_mid(treeCon->ses->server);
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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->sign)
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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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static int
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check_smb_hdr(struct smb_hdr *smb)
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{
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/* does it have the right SMB "signature" ? */
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if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
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cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
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*(unsigned int *)smb->Protocol);
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return 1;
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}
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/* if it's a response then accept */
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if (smb->Flags & SMBFLG_RESPONSE)
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return 0;
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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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cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
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get_mid(smb));
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return 1;
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}
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int
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checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
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{
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struct smb_hdr *smb = (struct smb_hdr *)buf;
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__u32 rfclen = be32_to_cpu(smb->smb_buf_length);
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__u32 clc_len; /* calculated length */
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cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
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total_read, rfclen);
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/* is this frame too small to even get to a BCC? */
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if (total_read < 2 + sizeof(struct smb_hdr)) {
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if ((total_read >= sizeof(struct smb_hdr) - 1)
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&& (smb->Status.CifsError != 0)) {
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/* it's an error return */
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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 if ((total_read == sizeof(struct smb_hdr) + 1) &&
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(smb->WordCount == 0)) {
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char *tmp = (char *)smb;
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/* Need to work around a bug in two servers here */
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/* First, check if the part of bcc they sent was zero */
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if (tmp[sizeof(struct smb_hdr)] == 0) {
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/* some servers return only half of bcc
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* on simple responses (wct, bcc both zero)
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* in particular have seen this on
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* ulogoffX and FindClose. This leaves
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* one byte of bcc potentially unitialized
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*/
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/* zero rest of bcc */
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tmp[sizeof(struct smb_hdr)+1] = 0;
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return 0;
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}
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cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
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} else {
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cifs_dbg(VFS, "Length less than smb header size\n");
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}
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return -EIO;
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}
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/* otherwise, there is enough to get to the BCC */
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if (check_smb_hdr(smb))
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return -EIO;
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clc_len = smbCalcSize(smb);
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if (4 + rfclen != total_read) {
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cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
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rfclen);
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return -EIO;
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}
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if (4 + rfclen != clc_len) {
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__u16 mid = get_mid(smb);
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/* check if bcc wrapped around for large read responses */
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if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
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/* check if lengths match mod 64K */
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if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
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return 0; /* bcc wrapped */
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}
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cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
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clc_len, 4 + rfclen, mid);
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if (4 + rfclen < clc_len) {
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cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
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rfclen, mid);
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return -EIO;
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} else if (rfclen > clc_len + 512) {
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/*
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* Some servers (Windows XP in particular) send more
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* data than the lengths in the SMB packet would
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* indicate on certain calls (byte range locks and
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* trans2 find first calls in particular). While the
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* client can handle such a frame by ignoring the
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* trailing data, we choose limit the amount of extra
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* data to 512 bytes.
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*/
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cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
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rfclen, mid);
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return -EIO;
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}
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}
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return 0;
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}
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bool
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is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
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{
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struct smb_hdr *buf = (struct smb_hdr *)buffer;
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struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
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struct list_head *tmp, *tmp1, *tmp2;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct cifsInodeInfo *pCifsInode;
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struct cifsFileInfo *netfile;
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cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
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if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
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(pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
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struct smb_com_transaction_change_notify_rsp *pSMBr =
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(struct smb_com_transaction_change_notify_rsp *)buf;
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struct file_notify_information *pnotify;
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__u32 data_offset = 0;
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if (get_bcc(buf) > sizeof(struct file_notify_information)) {
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data_offset = le32_to_cpu(pSMBr->DataOffset);
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pnotify = (struct file_notify_information *)
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((char *)&pSMBr->hdr.Protocol + data_offset);
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cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
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pnotify->FileName, pnotify->Action);
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/* cifs_dump_mem("Rcvd notify Data: ",buf,
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sizeof(struct smb_hdr)+60); */
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return true;
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}
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if (pSMBr->hdr.Status.CifsError) {
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cifs_dbg(FYI, "notify err 0x%x\n",
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pSMBr->hdr.Status.CifsError);
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return true;
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}
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return false;
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}
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if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
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return false;
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if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
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/* no sense logging error on invalid handle on oplock
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break - harmless race between close request and oplock
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break response is expected from time to time writing out
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large dirty files cached on the client */
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if ((NT_STATUS_INVALID_HANDLE) ==
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le32_to_cpu(pSMB->hdr.Status.CifsError)) {
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cifs_dbg(FYI, "invalid handle on oplock break\n");
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return true;
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} else if (ERRbadfid ==
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le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
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return true;
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} else {
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return false; /* on valid oplock brk we get "request" */
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}
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}
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if (pSMB->hdr.WordCount != 8)
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return false;
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cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
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pSMB->LockType, pSMB->OplockLevel);
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if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
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return false;
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/* look up tcon based on tid & uid */
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each(tmp, &srv->smb_ses_list) {
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ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
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list_for_each(tmp1, &ses->tcon_list) {
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tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
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if (tcon->tid != buf->Tid)
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continue;
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cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
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spin_lock(&cifs_file_list_lock);
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list_for_each(tmp2, &tcon->openFileList) {
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netfile = list_entry(tmp2, struct cifsFileInfo,
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tlist);
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if (pSMB->Fid != netfile->fid.netfid)
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continue;
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|
|
cifs_dbg(FYI, "file id match, oplock break\n");
|
|
pCifsInode = CIFS_I(d_inode(netfile->dentry));
|
|
|
|
set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
|
|
&pCifsInode->flags);
|
|
|
|
/*
|
|
* Set flag if the server downgrades the oplock
|
|
* to L2 else clear.
|
|
*/
|
|
if (pSMB->OplockLevel)
|
|
set_bit(
|
|
CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
|
|
&pCifsInode->flags);
|
|
else
|
|
clear_bit(
|
|
CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
|
|
&pCifsInode->flags);
|
|
|
|
queue_work(cifsiod_wq,
|
|
&netfile->oplock_break);
|
|
netfile->oplock_break_cancelled = false;
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "No matching file for oplock break\n");
|
|
return true;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
|
|
return true;
|
|
}
|
|
|
|
void
|
|
dump_smb(void *buf, int smb_buf_length)
|
|
{
|
|
if (traceSMB == 0)
|
|
return;
|
|
|
|
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
|
|
smb_buf_length, true);
|
|
}
|
|
|
|
void
|
|
cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
|
|
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
|
|
cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n",
|
|
cifs_sb_master_tcon(cifs_sb)->treeName);
|
|
}
|
|
}
|
|
|
|
void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
|
|
{
|
|
oplock &= 0xF;
|
|
|
|
if (oplock == OPLOCK_EXCLUSIVE) {
|
|
cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
|
|
cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
|
|
&cinode->vfs_inode);
|
|
} else if (oplock == OPLOCK_READ) {
|
|
cinode->oplock = CIFS_CACHE_READ_FLG;
|
|
cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
|
|
&cinode->vfs_inode);
|
|
} else
|
|
cinode->oplock = 0;
|
|
}
|
|
|
|
/*
|
|
* We wait for oplock breaks to be processed before we attempt to perform
|
|
* writes.
|
|
*/
|
|
int cifs_get_writer(struct cifsInodeInfo *cinode)
|
|
{
|
|
int rc;
|
|
|
|
start:
|
|
rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
|
|
TASK_KILLABLE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
spin_lock(&cinode->writers_lock);
|
|
if (!cinode->writers)
|
|
set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
|
|
cinode->writers++;
|
|
/* Check to see if we have started servicing an oplock break */
|
|
if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
|
|
cinode->writers--;
|
|
if (cinode->writers == 0) {
|
|
clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
|
|
wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
|
|
}
|
|
spin_unlock(&cinode->writers_lock);
|
|
goto start;
|
|
}
|
|
spin_unlock(&cinode->writers_lock);
|
|
return 0;
|
|
}
|
|
|
|
void cifs_put_writer(struct cifsInodeInfo *cinode)
|
|
{
|
|
spin_lock(&cinode->writers_lock);
|
|
cinode->writers--;
|
|
if (cinode->writers == 0) {
|
|
clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
|
|
wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
|
|
}
|
|
spin_unlock(&cinode->writers_lock);
|
|
}
|
|
|
|
void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
|
|
{
|
|
clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
|
|
wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
|
|
}
|
|
|
|
bool
|
|
backup_cred(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
|
|
if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid()))
|
|
return true;
|
|
}
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
|
|
if (in_group_p(cifs_sb->mnt_backupgid))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
cifs_del_pending_open(struct cifs_pending_open *open)
|
|
{
|
|
spin_lock(&cifs_file_list_lock);
|
|
list_del(&open->olist);
|
|
spin_unlock(&cifs_file_list_lock);
|
|
}
|
|
|
|
void
|
|
cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
|
|
struct cifs_pending_open *open)
|
|
{
|
|
#ifdef CONFIG_CIFS_SMB2
|
|
memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
|
|
#endif
|
|
open->oplock = CIFS_OPLOCK_NO_CHANGE;
|
|
open->tlink = tlink;
|
|
fid->pending_open = open;
|
|
list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
|
|
}
|
|
|
|
void
|
|
cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
|
|
struct cifs_pending_open *open)
|
|
{
|
|
spin_lock(&cifs_file_list_lock);
|
|
cifs_add_pending_open_locked(fid, tlink, open);
|
|
spin_unlock(&cifs_file_list_lock);
|
|
}
|