4 * Copyright (C) International Business Machines Corp., 2002,2011
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
41 #include <keys/user-type.h>
43 #include <linux/parser.h>
47 #include "cifsproto.h"
48 #include "cifs_unicode.h"
49 #include "cifs_debug.h"
50 #include "cifs_fs_sb.h"
53 #include "rfc1002pdu.h"
57 #define RFC1001_PORT 139
59 extern mempool_t *cifs_req_poolp;
61 /* FIXME: should these be tunable? */
62 #define TLINK_ERROR_EXPIRE (1 * HZ)
63 #define TLINK_IDLE_EXPIRE (600 * HZ)
67 /* Mount options that take no arguments */
68 Opt_user_xattr, Opt_nouser_xattr,
69 Opt_forceuid, Opt_noforceuid,
70 Opt_forcegid, Opt_noforcegid,
71 Opt_noblocksend, Opt_noautotune,
72 Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
73 Opt_mapposix, Opt_nomapposix,
74 Opt_mapchars, Opt_nomapchars, Opt_sfu,
75 Opt_nosfu, Opt_nodfs, Opt_posixpaths,
76 Opt_noposixpaths, Opt_nounix,
79 Opt_forcemandatorylock, Opt_setuids,
80 Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
81 Opt_nohard, Opt_nosoft,
83 Opt_nostrictsync, Opt_strictsync,
84 Opt_serverino, Opt_noserverino,
85 Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
86 Opt_acl, Opt_noacl, Opt_locallease,
87 Opt_sign, Opt_seal, Opt_noac,
88 Opt_fsc, Opt_mfsymlinks,
89 Opt_multiuser, Opt_sloppy, Opt_nosharesock,
91 /* Mount options which take numeric value */
92 Opt_backupuid, Opt_backupgid, Opt_uid,
93 Opt_cruid, Opt_gid, Opt_file_mode,
94 Opt_dirmode, Opt_port,
95 Opt_rsize, Opt_wsize, Opt_actimeo,
97 /* Mount options which take string value */
98 Opt_user, Opt_pass, Opt_ip,
99 Opt_domain, Opt_srcaddr, Opt_iocharset,
100 Opt_netbiosname, Opt_servern,
101 Opt_ver, Opt_vers, Opt_sec, Opt_cache,
103 /* Mount options to be ignored */
106 /* Options which could be blank */
114 static const match_table_t cifs_mount_option_tokens = {
116 { Opt_user_xattr, "user_xattr" },
117 { Opt_nouser_xattr, "nouser_xattr" },
118 { Opt_forceuid, "forceuid" },
119 { Opt_noforceuid, "noforceuid" },
120 { Opt_forcegid, "forcegid" },
121 { Opt_noforcegid, "noforcegid" },
122 { Opt_noblocksend, "noblocksend" },
123 { Opt_noautotune, "noautotune" },
124 { Opt_hard, "hard" },
125 { Opt_soft, "soft" },
126 { Opt_perm, "perm" },
127 { Opt_noperm, "noperm" },
128 { Opt_mapchars, "mapchars" }, /* SFU style */
129 { Opt_nomapchars, "nomapchars" },
130 { Opt_mapposix, "mapposix" }, /* SFM style */
131 { Opt_nomapposix, "nomapposix" },
133 { Opt_nosfu, "nosfu" },
134 { Opt_nodfs, "nodfs" },
135 { Opt_posixpaths, "posixpaths" },
136 { Opt_noposixpaths, "noposixpaths" },
137 { Opt_nounix, "nounix" },
138 { Opt_nounix, "nolinux" },
139 { Opt_nocase, "nocase" },
140 { Opt_nocase, "ignorecase" },
142 { Opt_nobrl, "nobrl" },
143 { Opt_nobrl, "nolock" },
144 { Opt_forcemandatorylock, "forcemandatorylock" },
145 { Opt_forcemandatorylock, "forcemand" },
146 { Opt_setuids, "setuids" },
147 { Opt_nosetuids, "nosetuids" },
148 { Opt_dynperm, "dynperm" },
149 { Opt_nodynperm, "nodynperm" },
150 { Opt_nohard, "nohard" },
151 { Opt_nosoft, "nosoft" },
152 { Opt_nointr, "nointr" },
153 { Opt_intr, "intr" },
154 { Opt_nostrictsync, "nostrictsync" },
155 { Opt_strictsync, "strictsync" },
156 { Opt_serverino, "serverino" },
157 { Opt_noserverino, "noserverino" },
158 { Opt_rwpidforward, "rwpidforward" },
159 { Opt_cifsacl, "cifsacl" },
160 { Opt_nocifsacl, "nocifsacl" },
162 { Opt_noacl, "noacl" },
163 { Opt_locallease, "locallease" },
164 { Opt_sign, "sign" },
165 { Opt_seal, "seal" },
166 { Opt_noac, "noac" },
168 { Opt_mfsymlinks, "mfsymlinks" },
169 { Opt_multiuser, "multiuser" },
170 { Opt_sloppy, "sloppy" },
171 { Opt_nosharesock, "nosharesock" },
173 { Opt_backupuid, "backupuid=%s" },
174 { Opt_backupgid, "backupgid=%s" },
175 { Opt_uid, "uid=%s" },
176 { Opt_cruid, "cruid=%s" },
177 { Opt_gid, "gid=%s" },
178 { Opt_file_mode, "file_mode=%s" },
179 { Opt_dirmode, "dirmode=%s" },
180 { Opt_dirmode, "dir_mode=%s" },
181 { Opt_port, "port=%s" },
182 { Opt_rsize, "rsize=%s" },
183 { Opt_wsize, "wsize=%s" },
184 { Opt_actimeo, "actimeo=%s" },
186 { Opt_blank_user, "user=" },
187 { Opt_blank_user, "username=" },
188 { Opt_user, "user=%s" },
189 { Opt_user, "username=%s" },
190 { Opt_blank_pass, "pass=" },
191 { Opt_blank_pass, "password=" },
192 { Opt_pass, "pass=%s" },
193 { Opt_pass, "password=%s" },
194 { Opt_blank_ip, "ip=" },
195 { Opt_blank_ip, "addr=" },
197 { Opt_ip, "addr=%s" },
198 { Opt_ignore, "unc=%s" },
199 { Opt_ignore, "target=%s" },
200 { Opt_ignore, "path=%s" },
201 { Opt_domain, "dom=%s" },
202 { Opt_domain, "domain=%s" },
203 { Opt_domain, "workgroup=%s" },
204 { Opt_srcaddr, "srcaddr=%s" },
205 { Opt_ignore, "prefixpath=%s" },
206 { Opt_iocharset, "iocharset=%s" },
207 { Opt_netbiosname, "netbiosname=%s" },
208 { Opt_servern, "servern=%s" },
209 { Opt_ver, "ver=%s" },
210 { Opt_vers, "vers=%s" },
211 { Opt_sec, "sec=%s" },
212 { Opt_cache, "cache=%s" },
214 { Opt_ignore, "cred" },
215 { Opt_ignore, "credentials" },
216 { Opt_ignore, "cred=%s" },
217 { Opt_ignore, "credentials=%s" },
218 { Opt_ignore, "guest" },
219 { Opt_ignore, "rw" },
220 { Opt_ignore, "ro" },
221 { Opt_ignore, "suid" },
222 { Opt_ignore, "nosuid" },
223 { Opt_ignore, "exec" },
224 { Opt_ignore, "noexec" },
225 { Opt_ignore, "nodev" },
226 { Opt_ignore, "noauto" },
227 { Opt_ignore, "dev" },
228 { Opt_ignore, "mand" },
229 { Opt_ignore, "nomand" },
230 { Opt_ignore, "_netdev" },
236 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
237 Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
238 Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
239 Opt_sec_ntlmv2i, Opt_sec_lanman,
245 static const match_table_t cifs_secflavor_tokens = {
246 { Opt_sec_krb5, "krb5" },
247 { Opt_sec_krb5i, "krb5i" },
248 { Opt_sec_krb5p, "krb5p" },
249 { Opt_sec_ntlmsspi, "ntlmsspi" },
250 { Opt_sec_ntlmssp, "ntlmssp" },
251 { Opt_ntlm, "ntlm" },
252 { Opt_sec_ntlmi, "ntlmi" },
253 { Opt_sec_ntlmv2, "nontlm" },
254 { Opt_sec_ntlmv2, "ntlmv2" },
255 { Opt_sec_ntlmv2i, "ntlmv2i" },
256 { Opt_sec_lanman, "lanman" },
257 { Opt_sec_none, "none" },
259 { Opt_sec_err, NULL }
270 static const match_table_t cifs_cacheflavor_tokens = {
271 { Opt_cache_loose, "loose" },
272 { Opt_cache_strict, "strict" },
273 { Opt_cache_none, "none" },
274 { Opt_cache_err, NULL }
277 static const match_table_t cifs_smb_version_tokens = {
278 { Smb_1, SMB1_VERSION_STRING },
279 { Smb_20, SMB20_VERSION_STRING},
280 { Smb_21, SMB21_VERSION_STRING },
281 { Smb_30, SMB30_VERSION_STRING },
282 { Smb_302, SMB302_VERSION_STRING },
285 static int ip_connect(struct TCP_Server_Info *server);
286 static int generic_ip_connect(struct TCP_Server_Info *server);
287 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
288 static void cifs_prune_tlinks(struct work_struct *work);
289 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
290 const char *devname);
293 * cifs tcp session reconnection
295 * mark tcp session as reconnecting so temporarily locked
296 * mark all smb sessions as reconnecting for tcp session
297 * reconnect tcp session
298 * wake up waiters on reconnection? - (not needed currently)
301 cifs_reconnect(struct TCP_Server_Info *server)
304 struct list_head *tmp, *tmp2;
305 struct cifs_ses *ses;
306 struct cifs_tcon *tcon;
307 struct mid_q_entry *mid_entry;
308 struct list_head retry_list;
310 spin_lock(&GlobalMid_Lock);
311 if (server->tcpStatus == CifsExiting) {
312 /* the demux thread will exit normally
313 next time through the loop */
314 spin_unlock(&GlobalMid_Lock);
317 server->tcpStatus = CifsNeedReconnect;
318 spin_unlock(&GlobalMid_Lock);
320 #ifdef CONFIG_CIFS_SMB2
321 server->max_read = 0;
324 cifs_dbg(FYI, "Reconnecting tcp session\n");
326 /* before reconnecting the tcp session, mark the smb session (uid)
327 and the tid bad so they are not used until reconnected */
328 cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
330 spin_lock(&cifs_tcp_ses_lock);
331 list_for_each(tmp, &server->smb_ses_list) {
332 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
333 ses->need_reconnect = true;
335 list_for_each(tmp2, &ses->tcon_list) {
336 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
337 tcon->need_reconnect = true;
340 spin_unlock(&cifs_tcp_ses_lock);
342 /* do not want to be sending data on a socket we are freeing */
343 cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
344 mutex_lock(&server->srv_mutex);
345 if (server->ssocket) {
346 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
347 server->ssocket->state, server->ssocket->flags);
348 kernel_sock_shutdown(server->ssocket, SHUT_WR);
349 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
350 server->ssocket->state, server->ssocket->flags);
351 sock_release(server->ssocket);
352 server->ssocket = NULL;
354 server->sequence_number = 0;
355 server->session_estab = false;
356 kfree(server->session_key.response);
357 server->session_key.response = NULL;
358 server->session_key.len = 0;
359 server->lstrp = jiffies;
360 mutex_unlock(&server->srv_mutex);
362 /* mark submitted MIDs for retry and issue callback */
363 INIT_LIST_HEAD(&retry_list);
364 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
365 spin_lock(&GlobalMid_Lock);
366 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
367 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
368 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
369 mid_entry->mid_state = MID_RETRY_NEEDED;
370 list_move(&mid_entry->qhead, &retry_list);
372 spin_unlock(&GlobalMid_Lock);
374 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
375 list_for_each_safe(tmp, tmp2, &retry_list) {
376 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
377 list_del_init(&mid_entry->qhead);
378 mid_entry->callback(mid_entry);
384 /* we should try only the port we connected to before */
385 mutex_lock(&server->srv_mutex);
386 rc = generic_ip_connect(server);
388 cifs_dbg(FYI, "reconnect error %d\n", rc);
391 atomic_inc(&tcpSesReconnectCount);
392 spin_lock(&GlobalMid_Lock);
393 if (server->tcpStatus != CifsExiting)
394 server->tcpStatus = CifsNeedNegotiate;
395 spin_unlock(&GlobalMid_Lock);
397 mutex_unlock(&server->srv_mutex);
398 } while (server->tcpStatus == CifsNeedReconnect);
404 cifs_echo_request(struct work_struct *work)
407 struct TCP_Server_Info *server = container_of(work,
408 struct TCP_Server_Info, echo.work);
411 * We cannot send an echo if it is disabled or until the
412 * NEGOTIATE_PROTOCOL request is done, which is indicated by
413 * server->ops->need_neg() == true. Also, no need to ping if
414 * we got a response recently.
416 if (!server->ops->need_neg || server->ops->need_neg(server) ||
417 (server->ops->can_echo && !server->ops->can_echo(server)) ||
418 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
421 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
423 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
427 queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
431 allocate_buffers(struct TCP_Server_Info *server)
433 if (!server->bigbuf) {
434 server->bigbuf = (char *)cifs_buf_get();
435 if (!server->bigbuf) {
436 cifs_dbg(VFS, "No memory for large SMB response\n");
438 /* retry will check if exiting */
441 } else if (server->large_buf) {
442 /* we are reusing a dirty large buf, clear its start */
443 memset(server->bigbuf, 0, HEADER_SIZE(server));
446 if (!server->smallbuf) {
447 server->smallbuf = (char *)cifs_small_buf_get();
448 if (!server->smallbuf) {
449 cifs_dbg(VFS, "No memory for SMB response\n");
451 /* retry will check if exiting */
454 /* beginning of smb buffer is cleared in our buf_get */
456 /* if existing small buf clear beginning */
457 memset(server->smallbuf, 0, HEADER_SIZE(server));
464 server_unresponsive(struct TCP_Server_Info *server)
467 * We need to wait 2 echo intervals to make sure we handle such
469 * 1s client sends a normal SMB request
470 * 2s client gets a response
471 * 30s echo workqueue job pops, and decides we got a response recently
472 * and don't need to send another
474 * 65s kernel_recvmsg times out, and we see that we haven't gotten
475 * a response in >60s.
477 if (server->tcpStatus == CifsGood &&
478 time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
479 cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n",
480 server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ);
481 cifs_reconnect(server);
482 wake_up(&server->response_q);
490 * kvec_array_init - clone a kvec array, and advance into it
491 * @new: pointer to memory for cloned array
492 * @iov: pointer to original array
493 * @nr_segs: number of members in original array
494 * @bytes: number of bytes to advance into the cloned array
496 * This function will copy the array provided in iov to a section of memory
497 * and advance the specified number of bytes into the new array. It returns
498 * the number of segments in the new array. "new" must be at least as big as
499 * the original iov array.
502 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
507 while (bytes || !iov->iov_len) {
508 int copy = min(bytes, iov->iov_len);
512 if (iov->iov_len == base) {
518 memcpy(new, iov, sizeof(*iov) * nr_segs);
519 new->iov_base += base;
520 new->iov_len -= base;
525 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
527 struct kvec *new_iov;
529 if (server->iov && nr_segs <= server->nr_iov)
532 /* not big enough -- allocate a new one and release the old */
533 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
536 server->iov = new_iov;
537 server->nr_iov = nr_segs;
543 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
544 unsigned int nr_segs, unsigned int to_read)
549 struct msghdr smb_msg;
552 iov = get_server_iovec(server, nr_segs);
556 smb_msg.msg_control = NULL;
557 smb_msg.msg_controllen = 0;
559 for (total_read = 0; to_read; total_read += length, to_read -= length) {
562 if (server_unresponsive(server)) {
563 total_read = -ECONNABORTED;
567 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
569 length = kernel_recvmsg(server->ssocket, &smb_msg,
570 iov, segs, to_read, 0);
572 if (server->tcpStatus == CifsExiting) {
573 total_read = -ESHUTDOWN;
575 } else if (server->tcpStatus == CifsNeedReconnect) {
576 cifs_reconnect(server);
577 total_read = -ECONNABORTED;
579 } else if (length == -ERESTARTSYS ||
583 * Minimum sleep to prevent looping, allowing socket
584 * to clear and app threads to set tcpStatus
585 * CifsNeedReconnect if server hung.
587 usleep_range(1000, 2000);
590 } else if (length <= 0) {
591 cifs_dbg(FYI, "Received no data or error: expecting %d\n"
592 "got %d", to_read, length);
593 cifs_reconnect(server);
594 total_read = -ECONNABORTED;
602 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
603 unsigned int to_read)
608 iov.iov_len = to_read;
610 return cifs_readv_from_socket(server, &iov, 1, to_read);
614 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
617 * The first byte big endian of the length field,
618 * is actually not part of the length but the type
619 * with the most common, zero, as regular data.
622 case RFC1002_SESSION_MESSAGE:
623 /* Regular SMB response */
625 case RFC1002_SESSION_KEEP_ALIVE:
626 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
628 case RFC1002_POSITIVE_SESSION_RESPONSE:
629 cifs_dbg(FYI, "RFC 1002 positive session response\n");
631 case RFC1002_NEGATIVE_SESSION_RESPONSE:
633 * We get this from Windows 98 instead of an error on
634 * SMB negprot response.
636 cifs_dbg(FYI, "RFC 1002 negative session response\n");
637 /* give server a second to clean up */
640 * Always try 445 first on reconnect since we get NACK
641 * on some if we ever connected to port 139 (the NACK
642 * is since we do not begin with RFC1001 session
645 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
646 cifs_reconnect(server);
647 wake_up(&server->response_q);
650 cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
651 cifs_reconnect(server);
658 dequeue_mid(struct mid_q_entry *mid, bool malformed)
660 #ifdef CONFIG_CIFS_STATS2
661 mid->when_received = jiffies;
663 spin_lock(&GlobalMid_Lock);
665 mid->mid_state = MID_RESPONSE_RECEIVED;
667 mid->mid_state = MID_RESPONSE_MALFORMED;
668 list_del_init(&mid->qhead);
669 spin_unlock(&GlobalMid_Lock);
673 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
674 char *buf, int malformed)
676 if (server->ops->check_trans2 &&
677 server->ops->check_trans2(mid, server, buf, malformed))
680 mid->large_buf = server->large_buf;
681 /* Was previous buf put in mpx struct for multi-rsp? */
682 if (!mid->multiRsp) {
683 /* smb buffer will be freed by user thread */
684 if (server->large_buf)
685 server->bigbuf = NULL;
687 server->smallbuf = NULL;
689 dequeue_mid(mid, malformed);
692 static void clean_demultiplex_info(struct TCP_Server_Info *server)
696 /* take it off the list, if it's not already */
697 spin_lock(&cifs_tcp_ses_lock);
698 list_del_init(&server->tcp_ses_list);
699 spin_unlock(&cifs_tcp_ses_lock);
701 spin_lock(&GlobalMid_Lock);
702 server->tcpStatus = CifsExiting;
703 spin_unlock(&GlobalMid_Lock);
704 wake_up_all(&server->response_q);
706 /* check if we have blocked requests that need to free */
707 spin_lock(&server->req_lock);
708 if (server->credits <= 0)
710 spin_unlock(&server->req_lock);
712 * Although there should not be any requests blocked on this queue it
713 * can not hurt to be paranoid and try to wake up requests that may
714 * haven been blocked when more than 50 at time were on the wire to the
715 * same server - they now will see the session is in exit state and get
716 * out of SendReceive.
718 wake_up_all(&server->request_q);
719 /* give those requests time to exit */
722 if (server->ssocket) {
723 sock_release(server->ssocket);
724 server->ssocket = NULL;
727 if (!list_empty(&server->pending_mid_q)) {
728 struct list_head dispose_list;
729 struct mid_q_entry *mid_entry;
730 struct list_head *tmp, *tmp2;
732 INIT_LIST_HEAD(&dispose_list);
733 spin_lock(&GlobalMid_Lock);
734 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
735 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
736 cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
737 mid_entry->mid_state = MID_SHUTDOWN;
738 list_move(&mid_entry->qhead, &dispose_list);
740 spin_unlock(&GlobalMid_Lock);
742 /* now walk dispose list and issue callbacks */
743 list_for_each_safe(tmp, tmp2, &dispose_list) {
744 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
745 cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
746 list_del_init(&mid_entry->qhead);
747 mid_entry->callback(mid_entry);
749 /* 1/8th of sec is more than enough time for them to exit */
753 if (!list_empty(&server->pending_mid_q)) {
755 * mpx threads have not exited yet give them at least the smb
756 * send timeout time for long ops.
758 * Due to delays on oplock break requests, we need to wait at
759 * least 45 seconds before giving up on a request getting a
760 * response and going ahead and killing cifsd.
762 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
765 * If threads still have not exited they are probably never
766 * coming home not much else we can do but free the memory.
770 kfree(server->hostname);
774 length = atomic_dec_return(&tcpSesAllocCount);
776 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
781 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
784 char *buf = server->smallbuf;
785 unsigned int pdu_length = get_rfc1002_length(buf);
787 /* make sure this will fit in a large buffer */
788 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
789 cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
790 cifs_reconnect(server);
791 wake_up(&server->response_q);
792 return -ECONNABORTED;
795 /* switch to large buffer if too big for a small one */
796 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
797 server->large_buf = true;
798 memcpy(server->bigbuf, buf, server->total_read);
799 buf = server->bigbuf;
802 /* now read the rest */
803 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
804 pdu_length - HEADER_SIZE(server) + 1 + 4);
807 server->total_read += length;
809 dump_smb(buf, server->total_read);
812 * We know that we received enough to get to the MID as we
813 * checked the pdu_length earlier. Now check to see
814 * if the rest of the header is OK. We borrow the length
815 * var for the rest of the loop to avoid a new stack var.
817 * 48 bytes is enough to display the header and a little bit
818 * into the payload for debugging purposes.
820 length = server->ops->check_message(buf, server->total_read);
822 cifs_dump_mem("Bad SMB: ", buf,
823 min_t(unsigned int, server->total_read, 48));
825 if (server->ops->is_status_pending &&
826 server->ops->is_status_pending(buf, server, length))
832 handle_mid(mid, server, buf, length);
837 cifs_demultiplex_thread(void *p)
840 struct TCP_Server_Info *server = p;
841 unsigned int pdu_length;
843 struct task_struct *task_to_wake = NULL;
844 struct mid_q_entry *mid_entry;
846 current->flags |= PF_MEMALLOC;
847 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
849 length = atomic_inc_return(&tcpSesAllocCount);
851 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
855 while (server->tcpStatus != CifsExiting) {
859 if (!allocate_buffers(server))
862 server->large_buf = false;
863 buf = server->smallbuf;
864 pdu_length = 4; /* enough to get RFC1001 header */
866 length = cifs_read_from_socket(server, buf, pdu_length);
869 server->total_read = length;
872 * The right amount was read from socket - 4 bytes,
873 * so we can now interpret the length field.
875 pdu_length = get_rfc1002_length(buf);
877 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
878 if (!is_smb_response(server, buf[0]))
881 /* make sure we have enough to get to the MID */
882 if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
883 cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
885 cifs_reconnect(server);
886 wake_up(&server->response_q);
890 /* read down to the MID */
891 length = cifs_read_from_socket(server, buf + 4,
892 HEADER_SIZE(server) - 1 - 4);
895 server->total_read += length;
897 mid_entry = server->ops->find_mid(server, buf);
899 if (!mid_entry || !mid_entry->receive)
900 length = standard_receive3(server, mid_entry);
902 length = mid_entry->receive(server, mid_entry);
907 if (server->large_buf)
908 buf = server->bigbuf;
910 server->lstrp = jiffies;
911 if (mid_entry != NULL) {
912 if (!mid_entry->multiRsp || mid_entry->multiEnd)
913 mid_entry->callback(mid_entry);
914 } else if (!server->ops->is_oplock_break ||
915 !server->ops->is_oplock_break(buf, server)) {
916 cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
917 atomic_read(&midCount));
918 cifs_dump_mem("Received Data is: ", buf,
919 HEADER_SIZE(server));
920 #ifdef CONFIG_CIFS_DEBUG2
921 if (server->ops->dump_detail)
922 server->ops->dump_detail(buf);
923 cifs_dump_mids(server);
924 #endif /* CIFS_DEBUG2 */
927 } /* end while !EXITING */
929 /* buffer usually freed in free_mid - need to free it here on exit */
930 cifs_buf_release(server->bigbuf);
931 if (server->smallbuf) /* no sense logging a debug message if NULL */
932 cifs_small_buf_release(server->smallbuf);
934 task_to_wake = xchg(&server->tsk, NULL);
935 clean_demultiplex_info(server);
937 /* if server->tsk was NULL then wait for a signal before exiting */
939 set_current_state(TASK_INTERRUPTIBLE);
940 while (!signal_pending(current)) {
942 set_current_state(TASK_INTERRUPTIBLE);
944 set_current_state(TASK_RUNNING);
947 module_put_and_exit(0);
950 /* extract the host portion of the UNC string */
952 extract_hostname(const char *unc)
958 /* skip double chars at beginning of string */
959 /* BB: check validity of these bytes? */
962 /* delimiter between hostname and sharename is always '\\' now */
963 delim = strchr(src, '\\');
965 return ERR_PTR(-EINVAL);
968 dst = kmalloc((len + 1), GFP_KERNEL);
970 return ERR_PTR(-ENOMEM);
972 memcpy(dst, src, len);
978 static int get_option_ul(substring_t args[], unsigned long *option)
983 string = match_strdup(args);
986 rc = kstrtoul(string, 0, option);
992 static int get_option_uid(substring_t args[], kuid_t *result)
998 rc = get_option_ul(args, &value);
1002 uid = make_kuid(current_user_ns(), value);
1003 if (!uid_valid(uid))
1010 static int get_option_gid(substring_t args[], kgid_t *result)
1012 unsigned long value;
1016 rc = get_option_ul(args, &value);
1020 gid = make_kgid(current_user_ns(), value);
1021 if (!gid_valid(gid))
1028 static int cifs_parse_security_flavors(char *value,
1029 struct smb_vol *vol)
1032 substring_t args[MAX_OPT_ARGS];
1035 * With mount options, the last one should win. Reset any existing
1036 * settings back to default.
1038 vol->sectype = Unspecified;
1041 switch (match_token(value, cifs_secflavor_tokens, args)) {
1043 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1049 vol->sectype = Kerberos;
1051 case Opt_sec_ntlmsspi:
1054 case Opt_sec_ntlmssp:
1055 vol->sectype = RawNTLMSSP;
1061 vol->sectype = NTLM;
1063 case Opt_sec_ntlmv2i:
1066 case Opt_sec_ntlmv2:
1067 vol->sectype = NTLMv2;
1069 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1070 case Opt_sec_lanman:
1071 vol->sectype = LANMAN;
1078 cifs_dbg(VFS, "bad security option: %s\n", value);
1086 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1088 substring_t args[MAX_OPT_ARGS];
1090 switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1091 case Opt_cache_loose:
1092 vol->direct_io = false;
1093 vol->strict_io = false;
1095 case Opt_cache_strict:
1096 vol->direct_io = false;
1097 vol->strict_io = true;
1099 case Opt_cache_none:
1100 vol->direct_io = true;
1101 vol->strict_io = false;
1104 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1111 cifs_parse_smb_version(char *value, struct smb_vol *vol)
1113 substring_t args[MAX_OPT_ARGS];
1115 switch (match_token(value, cifs_smb_version_tokens, args)) {
1117 vol->ops = &smb1_operations;
1118 vol->vals = &smb1_values;
1120 #ifdef CONFIG_CIFS_SMB2
1122 vol->ops = &smb20_operations;
1123 vol->vals = &smb20_values;
1126 vol->ops = &smb21_operations;
1127 vol->vals = &smb21_values;
1130 vol->ops = &smb30_operations;
1131 vol->vals = &smb30_values;
1134 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1135 vol->vals = &smb302_values;
1139 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1146 * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1147 * fields with the result. Returns 0 on success and an error otherwise.
1150 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1153 const char *delims = "/\\";
1156 /* make sure we have a valid UNC double delimiter prefix */
1157 len = strspn(devname, delims);
1161 /* find delimiter between host and sharename */
1162 pos = strpbrk(devname + 2, delims);
1166 /* skip past delimiter */
1169 /* now go until next delimiter or end of string */
1170 len = strcspn(pos, delims);
1172 /* move "pos" up to delimiter or NULL */
1174 vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1178 convert_delimiter(vol->UNC, '\\');
1180 /* If pos is NULL, or is a bogus trailing delimiter then no prepath */
1181 if (!*pos++ || !*pos)
1184 vol->prepath = kstrdup(pos, GFP_KERNEL);
1192 cifs_parse_mount_options(const char *mountdata, const char *devname,
1193 struct smb_vol *vol)
1196 char *mountdata_copy = NULL, *options;
1197 unsigned int temp_len, i, j;
1199 short int override_uid = -1;
1200 short int override_gid = -1;
1201 bool uid_specified = false;
1202 bool gid_specified = false;
1203 bool sloppy = false;
1204 char *invalid = NULL;
1205 char *nodename = utsname()->nodename;
1206 char *string = NULL;
1207 char *tmp_end, *value;
1209 bool got_ip = false;
1210 unsigned short port = 0;
1211 struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1215 delim = separator[0];
1217 /* ensure we always start with zeroed-out smb_vol */
1218 memset(vol, 0, sizeof(*vol));
1221 * does not have to be perfect mapping since field is
1222 * informational, only used for servers that do not support
1223 * port 445 and it can be overridden at mount time
1225 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1226 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1227 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1229 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1230 /* null target name indicates to use *SMBSERVR default called name
1231 if we end up sending RFC1001 session initialize */
1232 vol->target_rfc1001_name[0] = 0;
1233 vol->cred_uid = current_uid();
1234 vol->linux_uid = current_uid();
1235 vol->linux_gid = current_gid();
1238 * default to SFM style remapping of seven reserved characters
1239 * unless user overrides it or we negotiate CIFS POSIX where
1240 * it is unnecessary. Can not simultaneously use more than one mapping
1241 * since then readdir could list files that open could not open
1245 /* default to only allowing write access to owner of the mount */
1246 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1248 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1249 /* default is always to request posix paths. */
1250 vol->posix_paths = 1;
1251 /* default to using server inode numbers where available */
1252 vol->server_ino = 1;
1254 /* default is to use strict cifs caching semantics */
1255 vol->strict_io = true;
1257 vol->actimeo = CIFS_DEF_ACTIMEO;
1259 /* FIXME: add autonegotiation -- for now, SMB1 is default */
1260 vol->ops = &smb1_operations;
1261 vol->vals = &smb1_values;
1264 goto cifs_parse_mount_err;
1266 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1267 if (!mountdata_copy)
1268 goto cifs_parse_mount_err;
1270 options = mountdata_copy;
1271 end = options + strlen(options);
1273 if (strncmp(options, "sep=", 4) == 0) {
1274 if (options[4] != 0) {
1275 separator[0] = options[4];
1278 cifs_dbg(FYI, "Null separator not allowed\n");
1281 vol->backupuid_specified = false; /* no backup intent for a user */
1282 vol->backupgid_specified = false; /* no backup intent for a group */
1284 switch (cifs_parse_devname(devname, vol)) {
1288 cifs_dbg(VFS, "Unable to allocate memory for devname.\n");
1289 goto cifs_parse_mount_err;
1291 cifs_dbg(VFS, "Malformed UNC in devname.\n");
1292 goto cifs_parse_mount_err;
1294 cifs_dbg(VFS, "Unknown error parsing devname.\n");
1295 goto cifs_parse_mount_err;
1298 while ((data = strsep(&options, separator)) != NULL) {
1299 substring_t args[MAX_OPT_ARGS];
1300 unsigned long option;
1306 token = match_token(data, cifs_mount_option_tokens, args);
1310 /* Ingnore the following */
1314 /* Boolean values */
1315 case Opt_user_xattr:
1318 case Opt_nouser_xattr:
1324 case Opt_noforceuid:
1330 case Opt_noforcegid:
1333 case Opt_noblocksend:
1334 vol->noblocksnd = 1;
1336 case Opt_noautotune:
1337 vol->noautotune = 1;
1352 vol->sfu_remap = true;
1353 vol->remap = false; /* disable SFM mapping */
1355 case Opt_nomapchars:
1356 vol->sfu_remap = false;
1360 vol->sfu_remap = false; /* disable SFU mapping */
1362 case Opt_nomapposix:
1374 case Opt_posixpaths:
1375 vol->posix_paths = 1;
1377 case Opt_noposixpaths:
1378 vol->posix_paths = 0;
1381 vol->no_linux_ext = 1;
1392 * turn off mandatory locking in mode
1393 * if remote locking is turned off since the
1394 * local vfs will do advisory
1396 if (vol->file_mode ==
1397 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1398 vol->file_mode = S_IALLUGO;
1400 case Opt_forcemandatorylock:
1410 vol->dynperm = true;
1413 vol->dynperm = false;
1427 case Opt_nostrictsync:
1428 vol->nostrictsync = 1;
1430 case Opt_strictsync:
1431 vol->nostrictsync = 0;
1434 vol->server_ino = 1;
1436 case Opt_noserverino:
1437 vol->server_ino = 0;
1439 case Opt_rwpidforward:
1440 vol->rwpidforward = 1;
1449 vol->no_psx_acl = 0;
1452 vol->no_psx_acl = 1;
1454 case Opt_locallease:
1455 vol->local_lease = 1;
1461 /* we do not do the following in secFlags because seal
1462 * is a per tree connection (mount) not a per socket
1463 * or per-smb connection option in the protocol
1464 * vol->secFlg |= CIFSSEC_MUST_SEAL;
1469 pr_warn("CIFS: Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1472 #ifndef CONFIG_CIFS_FSCACHE
1473 cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1474 goto cifs_parse_mount_err;
1478 case Opt_mfsymlinks:
1479 vol->mfsymlinks = true;
1482 vol->multiuser = true;
1487 case Opt_nosharesock:
1488 vol->nosharesock = true;
1491 /* Numeric Values */
1493 if (get_option_uid(args, &vol->backupuid)) {
1494 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1496 goto cifs_parse_mount_err;
1498 vol->backupuid_specified = true;
1501 if (get_option_gid(args, &vol->backupgid)) {
1502 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1504 goto cifs_parse_mount_err;
1506 vol->backupgid_specified = true;
1509 if (get_option_uid(args, &vol->linux_uid)) {
1510 cifs_dbg(VFS, "%s: Invalid uid value\n",
1512 goto cifs_parse_mount_err;
1514 uid_specified = true;
1517 if (get_option_uid(args, &vol->cred_uid)) {
1518 cifs_dbg(VFS, "%s: Invalid cruid value\n",
1520 goto cifs_parse_mount_err;
1524 if (get_option_gid(args, &vol->linux_gid)) {
1525 cifs_dbg(VFS, "%s: Invalid gid value\n",
1527 goto cifs_parse_mount_err;
1529 gid_specified = true;
1532 if (get_option_ul(args, &option)) {
1533 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
1535 goto cifs_parse_mount_err;
1537 vol->file_mode = option;
1540 if (get_option_ul(args, &option)) {
1541 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
1543 goto cifs_parse_mount_err;
1545 vol->dir_mode = option;
1548 if (get_option_ul(args, &option) ||
1549 option > USHRT_MAX) {
1550 cifs_dbg(VFS, "%s: Invalid port value\n",
1552 goto cifs_parse_mount_err;
1554 port = (unsigned short)option;
1557 if (get_option_ul(args, &option)) {
1558 cifs_dbg(VFS, "%s: Invalid rsize value\n",
1560 goto cifs_parse_mount_err;
1562 vol->rsize = option;
1565 if (get_option_ul(args, &option)) {
1566 cifs_dbg(VFS, "%s: Invalid wsize value\n",
1568 goto cifs_parse_mount_err;
1570 vol->wsize = option;
1573 if (get_option_ul(args, &option)) {
1574 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
1576 goto cifs_parse_mount_err;
1578 vol->actimeo = HZ * option;
1579 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1580 cifs_dbg(VFS, "attribute cache timeout too large\n");
1581 goto cifs_parse_mount_err;
1585 /* String Arguments */
1587 case Opt_blank_user:
1588 /* null user, ie. anonymous authentication */
1590 vol->username = NULL;
1593 string = match_strdup(args);
1597 if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
1598 CIFS_MAX_USERNAME_LEN) {
1599 pr_warn("CIFS: username too long\n");
1600 goto cifs_parse_mount_err;
1603 kfree(vol->username);
1604 vol->username = kstrdup(string, GFP_KERNEL);
1606 goto cifs_parse_mount_err;
1608 case Opt_blank_pass:
1609 /* passwords have to be handled differently
1610 * to allow the character used for deliminator
1611 * to be passed within them
1615 * Check if this is a case where the password
1616 * starts with a delimiter
1618 tmp_end = strchr(data, '=');
1620 if (!(tmp_end < end && tmp_end[1] == delim)) {
1621 /* No it is not. Set the password to NULL */
1622 kfree(vol->password);
1623 vol->password = NULL;
1626 /* Yes it is. Drop down to Opt_pass below.*/
1628 /* Obtain the value string */
1629 value = strchr(data, '=');
1632 /* Set tmp_end to end of the string */
1633 tmp_end = (char *) value + strlen(value);
1635 /* Check if following character is the deliminator
1636 * If yes, we have encountered a double deliminator
1637 * reset the NULL character to the deliminator
1639 if (tmp_end < end && tmp_end[1] == delim) {
1642 /* Keep iterating until we get to a single
1643 * deliminator OR the end
1645 while ((tmp_end = strchr(tmp_end, delim))
1646 != NULL && (tmp_end[1] == delim)) {
1647 tmp_end = (char *) &tmp_end[2];
1650 /* Reset var options to point to next element */
1653 options = (char *) &tmp_end[1];
1655 /* Reached the end of the mount option
1660 kfree(vol->password);
1661 /* Now build new password string */
1662 temp_len = strlen(value);
1663 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1664 if (vol->password == NULL) {
1665 pr_warn("CIFS: no memory for password\n");
1666 goto cifs_parse_mount_err;
1669 for (i = 0, j = 0; i < temp_len; i++, j++) {
1670 vol->password[j] = value[i];
1671 if ((value[i] == delim) &&
1672 value[i+1] == delim)
1673 /* skip the second deliminator */
1676 vol->password[j] = '\0';
1679 /* FIXME: should this be an error instead? */
1683 string = match_strdup(args);
1687 if (!cifs_convert_address(dstaddr, string,
1689 pr_err("CIFS: bad ip= option (%s).\n", string);
1690 goto cifs_parse_mount_err;
1695 string = match_strdup(args);
1699 if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
1700 == CIFS_MAX_DOMAINNAME_LEN) {
1701 pr_warn("CIFS: domain name too long\n");
1702 goto cifs_parse_mount_err;
1705 kfree(vol->domainname);
1706 vol->domainname = kstrdup(string, GFP_KERNEL);
1707 if (!vol->domainname) {
1708 pr_warn("CIFS: no memory for domainname\n");
1709 goto cifs_parse_mount_err;
1711 cifs_dbg(FYI, "Domain name set\n");
1714 string = match_strdup(args);
1718 if (!cifs_convert_address(
1719 (struct sockaddr *)&vol->srcaddr,
1720 string, strlen(string))) {
1721 pr_warn("CIFS: Could not parse srcaddr: %s\n",
1723 goto cifs_parse_mount_err;
1727 string = match_strdup(args);
1731 if (strnlen(string, 1024) >= 65) {
1732 pr_warn("CIFS: iocharset name too long.\n");
1733 goto cifs_parse_mount_err;
1736 if (strncasecmp(string, "default", 7) != 0) {
1737 kfree(vol->iocharset);
1738 vol->iocharset = kstrdup(string,
1740 if (!vol->iocharset) {
1741 pr_warn("CIFS: no memory for charset\n");
1742 goto cifs_parse_mount_err;
1745 /* if iocharset not set then load_nls_default
1748 cifs_dbg(FYI, "iocharset set to %s\n", string);
1750 case Opt_netbiosname:
1751 string = match_strdup(args);
1755 memset(vol->source_rfc1001_name, 0x20,
1758 * FIXME: are there cases in which a comma can
1759 * be valid in workstation netbios name (and
1760 * need special handling)?
1762 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1763 /* don't ucase netbiosname for user */
1766 vol->source_rfc1001_name[i] = string[i];
1768 /* The string has 16th byte zero still from
1769 * set at top of the function
1771 if (i == RFC1001_NAME_LEN && string[i] != 0)
1772 pr_warn("CIFS: netbiosname longer than 15 truncated.\n");
1775 /* servernetbiosname specified override *SMBSERVER */
1776 string = match_strdup(args);
1780 /* last byte, type, is 0x20 for servr type */
1781 memset(vol->target_rfc1001_name, 0x20,
1782 RFC1001_NAME_LEN_WITH_NULL);
1784 /* BB are there cases in which a comma can be
1785 valid in this workstation netbios name
1786 (and need special handling)? */
1788 /* user or mount helper must uppercase the
1790 for (i = 0; i < 15; i++) {
1793 vol->target_rfc1001_name[i] = string[i];
1795 /* The string has 16th byte zero still from
1796 set at top of the function */
1797 if (i == RFC1001_NAME_LEN && string[i] != 0)
1798 pr_warn("CIFS: server netbiosname longer than 15 truncated.\n");
1801 string = match_strdup(args);
1805 if (strncasecmp(string, "1", 1) == 0) {
1806 /* This is the default */
1809 /* For all other value, error */
1810 pr_warn("CIFS: Invalid version specified\n");
1811 goto cifs_parse_mount_err;
1813 string = match_strdup(args);
1817 if (cifs_parse_smb_version(string, vol) != 0)
1818 goto cifs_parse_mount_err;
1821 string = match_strdup(args);
1825 if (cifs_parse_security_flavors(string, vol) != 0)
1826 goto cifs_parse_mount_err;
1829 string = match_strdup(args);
1833 if (cifs_parse_cache_flavor(string, vol) != 0)
1834 goto cifs_parse_mount_err;
1838 * An option we don't recognize. Save it off for later
1839 * if we haven't already found one
1845 /* Free up any allocated string */
1850 if (!sloppy && invalid) {
1851 pr_err("CIFS: Unknown mount option \"%s\"\n", invalid);
1852 goto cifs_parse_mount_err;
1856 /* Muliuser mounts require CONFIG_KEYS support */
1857 if (vol->multiuser) {
1858 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
1859 goto cifs_parse_mount_err;
1863 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
1864 goto cifs_parse_mount_err;
1867 /* make sure UNC has a share name */
1868 if (!strchr(vol->UNC + 3, '\\')) {
1869 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
1870 goto cifs_parse_mount_err;
1874 /* No ip= option specified? Try to get it from UNC */
1875 if (!cifs_convert_address(dstaddr, &vol->UNC[2],
1876 strlen(&vol->UNC[2]))) {
1877 pr_err("Unable to determine destination address.\n");
1878 goto cifs_parse_mount_err;
1882 /* set the port that we got earlier */
1883 cifs_set_port(dstaddr, port);
1886 vol->override_uid = override_uid;
1887 else if (override_uid == 1)
1888 pr_notice("CIFS: ignoring forceuid mount option specified with no uid= option.\n");
1891 vol->override_gid = override_gid;
1892 else if (override_gid == 1)
1893 pr_notice("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
1895 kfree(mountdata_copy);
1899 pr_warn("Could not allocate temporary buffer\n");
1900 cifs_parse_mount_err:
1902 kfree(mountdata_copy);
1906 /** Returns true if srcaddr isn't specified and rhs isn't
1907 * specified, or if srcaddr is specified and
1908 * matches the IP address of the rhs argument.
1911 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1913 switch (srcaddr->sa_family) {
1915 return (rhs->sa_family == AF_UNSPEC);
1917 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1918 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1919 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1922 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1923 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
1924 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1928 return false; /* don't expect to be here */
1933 * If no port is specified in addr structure, we try to match with 445 port
1934 * and if it fails - with 139 ports. It should be called only if address
1935 * families of server and addr are equal.
1938 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1940 __be16 port, *sport;
1942 switch (addr->sa_family) {
1944 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1945 port = ((struct sockaddr_in *) addr)->sin_port;
1948 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1949 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1957 port = htons(CIFS_PORT);
1961 port = htons(RFC1001_PORT);
1964 return port == *sport;
1968 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1969 struct sockaddr *srcaddr)
1971 switch (addr->sa_family) {
1973 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1974 struct sockaddr_in *srv_addr4 =
1975 (struct sockaddr_in *)&server->dstaddr;
1977 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1982 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1983 struct sockaddr_in6 *srv_addr6 =
1984 (struct sockaddr_in6 *)&server->dstaddr;
1986 if (!ipv6_addr_equal(&addr6->sin6_addr,
1987 &srv_addr6->sin6_addr))
1989 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1995 return false; /* don't expect to be here */
1998 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
2005 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2008 * The select_sectype function should either return the vol->sectype
2009 * that was specified, or "Unspecified" if that sectype was not
2010 * compatible with the given NEGOTIATE request.
2012 if (select_sectype(server, vol->sectype) == Unspecified)
2016 * Now check if signing mode is acceptable. No need to check
2017 * global_secflags at this point since if MUST_SIGN is set then
2018 * the server->sign had better be too.
2020 if (vol->sign && !server->sign)
2026 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2028 struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2030 if (vol->nosharesock)
2033 if ((server->vals != vol->vals) || (server->ops != vol->ops))
2036 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2039 if (!match_address(server, addr,
2040 (struct sockaddr *)&vol->srcaddr))
2043 if (!match_port(server, addr))
2046 if (!match_security(server, vol))
2052 static struct TCP_Server_Info *
2053 cifs_find_tcp_session(struct smb_vol *vol)
2055 struct TCP_Server_Info *server;
2057 spin_lock(&cifs_tcp_ses_lock);
2058 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2059 if (!match_server(server, vol))
2062 ++server->srv_count;
2063 spin_unlock(&cifs_tcp_ses_lock);
2064 cifs_dbg(FYI, "Existing tcp session with server found\n");
2067 spin_unlock(&cifs_tcp_ses_lock);
2072 cifs_put_tcp_session(struct TCP_Server_Info *server)
2074 struct task_struct *task;
2076 spin_lock(&cifs_tcp_ses_lock);
2077 if (--server->srv_count > 0) {
2078 spin_unlock(&cifs_tcp_ses_lock);
2082 put_net(cifs_net_ns(server));
2084 list_del_init(&server->tcp_ses_list);
2085 spin_unlock(&cifs_tcp_ses_lock);
2087 cancel_delayed_work_sync(&server->echo);
2089 spin_lock(&GlobalMid_Lock);
2090 server->tcpStatus = CifsExiting;
2091 spin_unlock(&GlobalMid_Lock);
2093 cifs_crypto_shash_release(server);
2094 cifs_fscache_release_client_cookie(server);
2096 kfree(server->session_key.response);
2097 server->session_key.response = NULL;
2098 server->session_key.len = 0;
2100 task = xchg(&server->tsk, NULL);
2102 force_sig(SIGKILL, task);
2105 static struct TCP_Server_Info *
2106 cifs_get_tcp_session(struct smb_vol *volume_info)
2108 struct TCP_Server_Info *tcp_ses = NULL;
2111 cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2113 /* see if we already have a matching tcp_ses */
2114 tcp_ses = cifs_find_tcp_session(volume_info);
2118 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2124 tcp_ses->ops = volume_info->ops;
2125 tcp_ses->vals = volume_info->vals;
2126 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2127 tcp_ses->hostname = extract_hostname(volume_info->UNC);
2128 if (IS_ERR(tcp_ses->hostname)) {
2129 rc = PTR_ERR(tcp_ses->hostname);
2130 goto out_err_crypto_release;
2133 tcp_ses->noblocksnd = volume_info->noblocksnd;
2134 tcp_ses->noautotune = volume_info->noautotune;
2135 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2136 tcp_ses->in_flight = 0;
2137 tcp_ses->credits = 1;
2138 init_waitqueue_head(&tcp_ses->response_q);
2139 init_waitqueue_head(&tcp_ses->request_q);
2140 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2141 mutex_init(&tcp_ses->srv_mutex);
2142 memcpy(tcp_ses->workstation_RFC1001_name,
2143 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2144 memcpy(tcp_ses->server_RFC1001_name,
2145 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2146 tcp_ses->session_estab = false;
2147 tcp_ses->sequence_number = 0;
2148 tcp_ses->lstrp = jiffies;
2149 spin_lock_init(&tcp_ses->req_lock);
2150 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2151 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2152 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2153 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2154 sizeof(tcp_ses->srcaddr));
2155 memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2156 sizeof(tcp_ses->dstaddr));
2157 #ifdef CONFIG_CIFS_SMB2
2158 get_random_bytes(tcp_ses->client_guid, SMB2_CLIENT_GUID_SIZE);
2161 * at this point we are the only ones with the pointer
2162 * to the struct since the kernel thread not created yet
2163 * no need to spinlock this init of tcpStatus or srv_count
2165 tcp_ses->tcpStatus = CifsNew;
2166 ++tcp_ses->srv_count;
2168 rc = ip_connect(tcp_ses);
2170 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2171 goto out_err_crypto_release;
2175 * since we're in a cifs function already, we know that
2176 * this will succeed. No need for try_module_get().
2178 __module_get(THIS_MODULE);
2179 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2181 if (IS_ERR(tcp_ses->tsk)) {
2182 rc = PTR_ERR(tcp_ses->tsk);
2183 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2184 module_put(THIS_MODULE);
2185 goto out_err_crypto_release;
2187 tcp_ses->tcpStatus = CifsNeedNegotiate;
2189 /* thread spawned, put it on the list */
2190 spin_lock(&cifs_tcp_ses_lock);
2191 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2192 spin_unlock(&cifs_tcp_ses_lock);
2194 cifs_fscache_get_client_cookie(tcp_ses);
2196 /* queue echo request delayed work */
2197 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
2201 out_err_crypto_release:
2202 cifs_crypto_shash_release(tcp_ses);
2204 put_net(cifs_net_ns(tcp_ses));
2208 if (!IS_ERR(tcp_ses->hostname))
2209 kfree(tcp_ses->hostname);
2210 if (tcp_ses->ssocket)
2211 sock_release(tcp_ses->ssocket);
2217 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2219 if (vol->sectype != Unspecified &&
2220 vol->sectype != ses->sectype)
2223 switch (ses->sectype) {
2225 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2229 /* NULL username means anonymous session */
2230 if (ses->user_name == NULL) {
2236 /* anything else takes username/password */
2237 if (strncmp(ses->user_name,
2238 vol->username ? vol->username : "",
2239 CIFS_MAX_USERNAME_LEN))
2241 if ((vol->username && strlen(vol->username) != 0) &&
2242 ses->password != NULL &&
2243 strncmp(ses->password,
2244 vol->password ? vol->password : "",
2245 CIFS_MAX_PASSWORD_LEN))
2251 static struct cifs_ses *
2252 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2254 struct cifs_ses *ses;
2256 spin_lock(&cifs_tcp_ses_lock);
2257 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2258 if (ses->status == CifsExiting)
2260 if (!match_session(ses, vol))
2263 spin_unlock(&cifs_tcp_ses_lock);
2266 spin_unlock(&cifs_tcp_ses_lock);
2271 cifs_put_smb_ses(struct cifs_ses *ses)
2273 unsigned int rc, xid;
2274 struct TCP_Server_Info *server = ses->server;
2276 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
2278 spin_lock(&cifs_tcp_ses_lock);
2279 if (ses->status == CifsExiting) {
2280 spin_unlock(&cifs_tcp_ses_lock);
2283 if (--ses->ses_count > 0) {
2284 spin_unlock(&cifs_tcp_ses_lock);
2287 if (ses->status == CifsGood)
2288 ses->status = CifsExiting;
2289 spin_unlock(&cifs_tcp_ses_lock);
2291 if (ses->status == CifsExiting && server->ops->logoff) {
2293 rc = server->ops->logoff(xid, ses);
2295 cifs_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
2300 spin_lock(&cifs_tcp_ses_lock);
2301 list_del_init(&ses->smb_ses_list);
2302 spin_unlock(&cifs_tcp_ses_lock);
2305 cifs_put_tcp_session(server);
2310 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
2311 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
2313 /* Populate username and pw fields from keyring if possible */
2315 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
2318 char *desc, *delim, *payload;
2321 struct TCP_Server_Info *server = ses->server;
2322 struct sockaddr_in *sa;
2323 struct sockaddr_in6 *sa6;
2324 struct user_key_payload *upayload;
2326 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
2330 /* try to find an address key first */
2331 switch (server->dstaddr.ss_family) {
2333 sa = (struct sockaddr_in *)&server->dstaddr;
2334 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
2337 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
2338 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
2341 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
2342 server->dstaddr.ss_family);
2347 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2348 key = request_key(&key_type_logon, desc, "");
2350 if (!ses->domainName) {
2351 cifs_dbg(FYI, "domainName is NULL\n");
2356 /* didn't work, try to find a domain key */
2357 sprintf(desc, "cifs:d:%s", ses->domainName);
2358 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
2359 key = request_key(&key_type_logon, desc, "");
2366 down_read(&key->sem);
2367 upayload = key->payload.data;
2368 if (IS_ERR_OR_NULL(upayload)) {
2369 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
2373 /* find first : in payload */
2374 payload = (char *)upayload->data;
2375 delim = strnchr(payload, upayload->datalen, ':');
2376 cifs_dbg(FYI, "payload=%s\n", payload);
2378 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
2384 len = delim - payload;
2385 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
2386 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
2392 vol->username = kstrndup(payload, len, GFP_KERNEL);
2393 if (!vol->username) {
2394 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
2399 cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
2401 len = key->datalen - (len + 1);
2402 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
2403 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
2405 kfree(vol->username);
2406 vol->username = NULL;
2411 vol->password = kstrndup(delim, len, GFP_KERNEL);
2412 if (!vol->password) {
2413 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
2416 kfree(vol->username);
2417 vol->username = NULL;
2426 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
2429 #else /* ! CONFIG_KEYS */
2431 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
2432 struct cifs_ses *ses __attribute__((unused)))
2436 #endif /* CONFIG_KEYS */
2438 static struct cifs_ses *
2439 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2443 struct cifs_ses *ses;
2444 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2445 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2449 ses = cifs_find_smb_ses(server, volume_info);
2451 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
2454 mutex_lock(&ses->session_mutex);
2455 rc = cifs_negotiate_protocol(xid, ses);
2457 mutex_unlock(&ses->session_mutex);
2458 /* problem -- put our ses reference */
2459 cifs_put_smb_ses(ses);
2463 if (ses->need_reconnect) {
2464 cifs_dbg(FYI, "Session needs reconnect\n");
2465 rc = cifs_setup_session(xid, ses,
2466 volume_info->local_nls);
2468 mutex_unlock(&ses->session_mutex);
2469 /* problem -- put our reference */
2470 cifs_put_smb_ses(ses);
2475 mutex_unlock(&ses->session_mutex);
2477 /* existing SMB ses has a server reference already */
2478 cifs_put_tcp_session(server);
2483 cifs_dbg(FYI, "Existing smb sess not found\n");
2484 ses = sesInfoAlloc();
2488 /* new SMB session uses our server ref */
2489 ses->server = server;
2490 if (server->dstaddr.ss_family == AF_INET6)
2491 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2493 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2495 if (volume_info->username) {
2496 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2497 if (!ses->user_name)
2501 /* volume_info->password freed at unmount */
2502 if (volume_info->password) {
2503 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2507 if (volume_info->domainname) {
2508 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2509 if (!ses->domainName)
2512 ses->cred_uid = volume_info->cred_uid;
2513 ses->linux_uid = volume_info->linux_uid;
2515 ses->sectype = volume_info->sectype;
2516 ses->sign = volume_info->sign;
2518 mutex_lock(&ses->session_mutex);
2519 rc = cifs_negotiate_protocol(xid, ses);
2521 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2522 mutex_unlock(&ses->session_mutex);
2526 /* success, put it on the list */
2527 spin_lock(&cifs_tcp_ses_lock);
2528 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2529 spin_unlock(&cifs_tcp_ses_lock);
2540 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2542 if (tcon->tidStatus == CifsExiting)
2544 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2549 static struct cifs_tcon *
2550 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2552 struct list_head *tmp;
2553 struct cifs_tcon *tcon;
2555 spin_lock(&cifs_tcp_ses_lock);
2556 list_for_each(tmp, &ses->tcon_list) {
2557 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2558 if (!match_tcon(tcon, unc))
2561 spin_unlock(&cifs_tcp_ses_lock);
2564 spin_unlock(&cifs_tcp_ses_lock);
2569 cifs_put_tcon(struct cifs_tcon *tcon)
2572 struct cifs_ses *ses = tcon->ses;
2574 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2575 spin_lock(&cifs_tcp_ses_lock);
2576 if (--tcon->tc_count > 0) {
2577 spin_unlock(&cifs_tcp_ses_lock);
2581 list_del_init(&tcon->tcon_list);
2582 spin_unlock(&cifs_tcp_ses_lock);
2585 if (ses->server->ops->tree_disconnect)
2586 ses->server->ops->tree_disconnect(xid, tcon);
2589 cifs_fscache_release_super_cookie(tcon);
2591 cifs_put_smb_ses(ses);
2594 static struct cifs_tcon *
2595 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2598 struct cifs_tcon *tcon;
2600 tcon = cifs_find_tcon(ses, volume_info->UNC);
2602 cifs_dbg(FYI, "Found match on UNC path\n");
2603 /* existing tcon already has a reference */
2604 cifs_put_smb_ses(ses);
2605 if (tcon->seal != volume_info->seal)
2606 cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n");
2610 if (!ses->server->ops->tree_connect) {
2615 tcon = tconInfoAlloc();
2622 if (volume_info->password) {
2623 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2624 if (!tcon->password) {
2631 * BB Do we need to wrap session_mutex around this TCon call and Unix
2632 * SetFS as we do on SessSetup and reconnect?
2635 rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
2636 volume_info->local_nls);
2638 cifs_dbg(FYI, "Tcon rc = %d\n", rc);
2642 if (volume_info->nodfs) {
2643 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2644 cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags);
2646 tcon->seal = volume_info->seal;
2648 * We can have only one retry value for a connection to a share so for
2649 * resources mounted more than once to the same server share the last
2650 * value passed in for the retry flag is used.
2652 tcon->retry = volume_info->retry;
2653 tcon->nocase = volume_info->nocase;
2654 tcon->local_lease = volume_info->local_lease;
2655 INIT_LIST_HEAD(&tcon->pending_opens);
2657 spin_lock(&cifs_tcp_ses_lock);
2658 list_add(&tcon->tcon_list, &ses->tcon_list);
2659 spin_unlock(&cifs_tcp_ses_lock);
2661 cifs_fscache_get_super_cookie(tcon);
2671 cifs_put_tlink(struct tcon_link *tlink)
2673 if (!tlink || IS_ERR(tlink))
2676 if (!atomic_dec_and_test(&tlink->tl_count) ||
2677 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2678 tlink->tl_time = jiffies;
2682 if (!IS_ERR(tlink_tcon(tlink)))
2683 cifs_put_tcon(tlink_tcon(tlink));
2688 static inline struct tcon_link *
2689 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2691 return cifs_sb->master_tlink;
2695 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2697 struct cifs_sb_info *old = CIFS_SB(sb);
2698 struct cifs_sb_info *new = mnt_data->cifs_sb;
2700 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2703 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2704 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2708 * We want to share sb only if we don't specify an r/wsize or
2709 * specified r/wsize is greater than or equal to existing one.
2711 if (new->wsize && new->wsize < old->wsize)
2714 if (new->rsize && new->rsize < old->rsize)
2717 if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
2720 if (old->mnt_file_mode != new->mnt_file_mode ||
2721 old->mnt_dir_mode != new->mnt_dir_mode)
2724 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2727 if (old->actimeo != new->actimeo)
2734 cifs_match_super(struct super_block *sb, void *data)
2736 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2737 struct smb_vol *volume_info;
2738 struct cifs_sb_info *cifs_sb;
2739 struct TCP_Server_Info *tcp_srv;
2740 struct cifs_ses *ses;
2741 struct cifs_tcon *tcon;
2742 struct tcon_link *tlink;
2745 spin_lock(&cifs_tcp_ses_lock);
2746 cifs_sb = CIFS_SB(sb);
2747 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2748 if (IS_ERR(tlink)) {
2749 spin_unlock(&cifs_tcp_ses_lock);
2752 tcon = tlink_tcon(tlink);
2754 tcp_srv = ses->server;
2756 volume_info = mnt_data->vol;
2758 if (!match_server(tcp_srv, volume_info) ||
2759 !match_session(ses, volume_info) ||
2760 !match_tcon(tcon, volume_info->UNC)) {
2765 rc = compare_mount_options(sb, mnt_data);
2767 spin_unlock(&cifs_tcp_ses_lock);
2768 cifs_put_tlink(tlink);
2773 get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path,
2774 const struct nls_table *nls_codepage, unsigned int *num_referrals,
2775 struct dfs_info3_param **referrals, int remap)
2780 if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer)
2786 if (ses->ipc_tid == 0) {
2787 temp_unc = kmalloc(2 /* for slashes */ +
2788 strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
2789 + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
2790 if (temp_unc == NULL)
2794 strcpy(temp_unc + 2, ses->serverName);
2795 strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
2796 rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
2798 cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid);
2802 rc = ses->server->ops->get_dfs_refer(xid, ses, old_path,
2803 referrals, num_referrals,
2804 nls_codepage, remap);
2806 * BB - map targetUNCs to dfs_info3 structures, here or in
2807 * ses->server->ops->get_dfs_refer.
2813 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2814 static struct lock_class_key cifs_key[2];
2815 static struct lock_class_key cifs_slock_key[2];
2818 cifs_reclassify_socket4(struct socket *sock)
2820 struct sock *sk = sock->sk;
2821 BUG_ON(sock_owned_by_user(sk));
2822 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2823 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2827 cifs_reclassify_socket6(struct socket *sock)
2829 struct sock *sk = sock->sk;
2830 BUG_ON(sock_owned_by_user(sk));
2831 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2832 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2836 cifs_reclassify_socket4(struct socket *sock)
2841 cifs_reclassify_socket6(struct socket *sock)
2846 /* See RFC1001 section 14 on representation of Netbios names */
2847 static void rfc1002mangle(char *target, char *source, unsigned int length)
2851 for (i = 0, j = 0; i < (length); i++) {
2852 /* mask a nibble at a time and encode */
2853 target[j] = 'A' + (0x0F & (source[i] >> 4));
2854 target[j+1] = 'A' + (0x0F & source[i]);
2861 bind_socket(struct TCP_Server_Info *server)
2864 if (server->srcaddr.ss_family != AF_UNSPEC) {
2865 /* Bind to the specified local IP address */
2866 struct socket *socket = server->ssocket;
2867 rc = socket->ops->bind(socket,
2868 (struct sockaddr *) &server->srcaddr,
2869 sizeof(server->srcaddr));
2871 struct sockaddr_in *saddr4;
2872 struct sockaddr_in6 *saddr6;
2873 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2874 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2875 if (saddr6->sin6_family == AF_INET6)
2876 cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
2877 &saddr6->sin6_addr, rc);
2879 cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
2880 &saddr4->sin_addr.s_addr, rc);
2887 ip_rfc1001_connect(struct TCP_Server_Info *server)
2891 * some servers require RFC1001 sessinit before sending
2892 * negprot - BB check reconnection in case where second
2893 * sessinit is sent but no second negprot
2895 struct rfc1002_session_packet *ses_init_buf;
2896 struct smb_hdr *smb_buf;
2897 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2900 ses_init_buf->trailer.session_req.called_len = 32;
2902 if (server->server_RFC1001_name &&
2903 server->server_RFC1001_name[0] != 0)
2904 rfc1002mangle(ses_init_buf->trailer.
2905 session_req.called_name,
2906 server->server_RFC1001_name,
2907 RFC1001_NAME_LEN_WITH_NULL);
2909 rfc1002mangle(ses_init_buf->trailer.
2910 session_req.called_name,
2911 DEFAULT_CIFS_CALLED_NAME,
2912 RFC1001_NAME_LEN_WITH_NULL);
2914 ses_init_buf->trailer.session_req.calling_len = 32;
2917 * calling name ends in null (byte 16) from old smb
2920 if (server->workstation_RFC1001_name[0] != 0)
2921 rfc1002mangle(ses_init_buf->trailer.
2922 session_req.calling_name,
2923 server->workstation_RFC1001_name,
2924 RFC1001_NAME_LEN_WITH_NULL);
2926 rfc1002mangle(ses_init_buf->trailer.
2927 session_req.calling_name,
2929 RFC1001_NAME_LEN_WITH_NULL);
2931 ses_init_buf->trailer.session_req.scope1 = 0;
2932 ses_init_buf->trailer.session_req.scope2 = 0;
2933 smb_buf = (struct smb_hdr *)ses_init_buf;
2935 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2936 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2937 rc = smb_send(server, smb_buf, 0x44);
2938 kfree(ses_init_buf);
2940 * RFC1001 layer in at least one server
2941 * requires very short break before negprot
2942 * presumably because not expecting negprot
2943 * to follow so fast. This is a simple
2944 * solution that works without
2945 * complicating the code and causes no
2946 * significant slowing down on mount
2949 usleep_range(1000, 2000);
2952 * else the negprot may still work without this
2953 * even though malloc failed
2960 generic_ip_connect(struct TCP_Server_Info *server)
2965 struct socket *socket = server->ssocket;
2966 struct sockaddr *saddr;
2968 saddr = (struct sockaddr *) &server->dstaddr;
2970 if (server->dstaddr.ss_family == AF_INET6) {
2971 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2972 slen = sizeof(struct sockaddr_in6);
2975 sport = ((struct sockaddr_in *) saddr)->sin_port;
2976 slen = sizeof(struct sockaddr_in);
2980 if (socket == NULL) {
2981 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2982 IPPROTO_TCP, &socket, 1);
2984 cifs_dbg(VFS, "Error %d creating socket\n", rc);
2985 server->ssocket = NULL;
2989 /* BB other socket options to set KEEPALIVE, NODELAY? */
2990 cifs_dbg(FYI, "Socket created\n");
2991 server->ssocket = socket;
2992 socket->sk->sk_allocation = GFP_NOFS;
2993 if (sfamily == AF_INET6)
2994 cifs_reclassify_socket6(socket);
2996 cifs_reclassify_socket4(socket);
2999 rc = bind_socket(server);
3004 * Eventually check for other socket options to change from
3005 * the default. sock_setsockopt not used because it expects
3008 socket->sk->sk_rcvtimeo = 7 * HZ;
3009 socket->sk->sk_sndtimeo = 5 * HZ;
3011 /* make the bufsizes depend on wsize/rsize and max requests */
3012 if (server->noautotune) {
3013 if (socket->sk->sk_sndbuf < (200 * 1024))
3014 socket->sk->sk_sndbuf = 200 * 1024;
3015 if (socket->sk->sk_rcvbuf < (140 * 1024))
3016 socket->sk->sk_rcvbuf = 140 * 1024;
3019 if (server->tcp_nodelay) {
3021 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
3022 (char *)&val, sizeof(val));
3024 cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
3028 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3029 socket->sk->sk_sndbuf,
3030 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3032 rc = socket->ops->connect(socket, saddr, slen, 0);
3034 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3035 sock_release(socket);
3036 server->ssocket = NULL;
3040 if (sport == htons(RFC1001_PORT))
3041 rc = ip_rfc1001_connect(server);
3047 ip_connect(struct TCP_Server_Info *server)
3050 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3051 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3053 if (server->dstaddr.ss_family == AF_INET6)
3054 sport = &addr6->sin6_port;
3056 sport = &addr->sin_port;
3061 /* try with 445 port at first */
3062 *sport = htons(CIFS_PORT);
3064 rc = generic_ip_connect(server);
3068 /* if it failed, try with 139 port */
3069 *sport = htons(RFC1001_PORT);
3072 return generic_ip_connect(server);
3075 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3076 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3078 /* if we are reconnecting then should we check to see if
3079 * any requested capabilities changed locally e.g. via
3080 * remount but we can not do much about it here
3081 * if they have (even if we could detect it by the following)
3082 * Perhaps we could add a backpointer to array of sb from tcon
3083 * or if we change to make all sb to same share the same
3084 * sb as NFS - then we only have one backpointer to sb.
3085 * What if we wanted to mount the server share twice once with
3086 * and once without posixacls or posix paths? */
3087 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3089 if (vol_info && vol_info->no_linux_ext) {
3090 tcon->fsUnixInfo.Capability = 0;
3091 tcon->unix_ext = 0; /* Unix Extensions disabled */
3092 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
3094 } else if (vol_info)
3095 tcon->unix_ext = 1; /* Unix Extensions supported */
3097 if (tcon->unix_ext == 0) {
3098 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
3102 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
3103 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
3104 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
3105 /* check for reconnect case in which we do not
3106 want to change the mount behavior if we can avoid it */
3107 if (vol_info == NULL) {
3108 /* turn off POSIX ACL and PATHNAMES if not set
3109 originally at mount time */
3110 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
3111 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3112 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3113 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3114 cifs_dbg(VFS, "POSIXPATH support change\n");
3115 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3116 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
3117 cifs_dbg(VFS, "possible reconnect error\n");
3118 cifs_dbg(VFS, "server disabled POSIX path support\n");
3122 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3123 cifs_dbg(VFS, "per-share encryption not supported yet\n");
3125 cap &= CIFS_UNIX_CAP_MASK;
3126 if (vol_info && vol_info->no_psx_acl)
3127 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
3128 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
3129 cifs_dbg(FYI, "negotiated posix acl support\n");
3131 cifs_sb->mnt_cifs_flags |=
3132 CIFS_MOUNT_POSIXACL;
3135 if (vol_info && vol_info->posix_paths == 0)
3136 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
3137 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
3138 cifs_dbg(FYI, "negotiate posix pathnames\n");
3140 cifs_sb->mnt_cifs_flags |=
3141 CIFS_MOUNT_POSIX_PATHS;
3144 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
3145 #ifdef CONFIG_CIFS_DEBUG2
3146 if (cap & CIFS_UNIX_FCNTL_CAP)
3147 cifs_dbg(FYI, "FCNTL cap\n");
3148 if (cap & CIFS_UNIX_EXTATTR_CAP)
3149 cifs_dbg(FYI, "EXTATTR cap\n");
3150 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
3151 cifs_dbg(FYI, "POSIX path cap\n");
3152 if (cap & CIFS_UNIX_XATTR_CAP)
3153 cifs_dbg(FYI, "XATTR cap\n");
3154 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
3155 cifs_dbg(FYI, "POSIX ACL cap\n");
3156 if (cap & CIFS_UNIX_LARGE_READ_CAP)
3157 cifs_dbg(FYI, "very large read cap\n");
3158 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
3159 cifs_dbg(FYI, "very large write cap\n");
3160 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
3161 cifs_dbg(FYI, "transport encryption cap\n");
3162 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
3163 cifs_dbg(FYI, "mandatory transport encryption cap\n");
3164 #endif /* CIFS_DEBUG2 */
3165 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
3166 if (vol_info == NULL) {
3167 cifs_dbg(FYI, "resetting capabilities failed\n");
3169 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
3175 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
3176 struct cifs_sb_info *cifs_sb)
3178 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
3180 spin_lock_init(&cifs_sb->tlink_tree_lock);
3181 cifs_sb->tlink_tree = RB_ROOT;
3184 * Temporarily set r/wsize for matching superblock. If we end up using
3185 * new sb then client will later negotiate it downward if needed.
3187 cifs_sb->rsize = pvolume_info->rsize;
3188 cifs_sb->wsize = pvolume_info->wsize;
3190 cifs_sb->mnt_uid = pvolume_info->linux_uid;
3191 cifs_sb->mnt_gid = pvolume_info->linux_gid;
3192 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
3193 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
3194 cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n",
3195 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
3197 cifs_sb->actimeo = pvolume_info->actimeo;
3198 cifs_sb->local_nls = pvolume_info->local_nls;
3200 if (pvolume_info->noperm)
3201 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
3202 if (pvolume_info->setuids)
3203 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
3204 if (pvolume_info->server_ino)
3205 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
3206 if (pvolume_info->remap)
3207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
3208 if (pvolume_info->sfu_remap)
3209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
3210 if (pvolume_info->no_xattr)
3211 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
3212 if (pvolume_info->sfu_emul)
3213 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
3214 if (pvolume_info->nobrl)
3215 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
3216 if (pvolume_info->nostrictsync)
3217 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
3218 if (pvolume_info->mand_lock)
3219 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
3220 if (pvolume_info->rwpidforward)
3221 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
3222 if (pvolume_info->cifs_acl)
3223 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
3224 if (pvolume_info->backupuid_specified) {
3225 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
3226 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
3228 if (pvolume_info->backupgid_specified) {
3229 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
3230 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
3232 if (pvolume_info->override_uid)
3233 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
3234 if (pvolume_info->override_gid)
3235 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
3236 if (pvolume_info->dynperm)
3237 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
3238 if (pvolume_info->fsc)
3239 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
3240 if (pvolume_info->multiuser)
3241 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
3242 CIFS_MOUNT_NO_PERM);
3243 if (pvolume_info->strict_io)
3244 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
3245 if (pvolume_info->direct_io) {
3246 cifs_dbg(FYI, "mounting share using direct i/o\n");
3247 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
3249 if (pvolume_info->mfsymlinks) {
3250 if (pvolume_info->sfu_emul) {
3252 * Our SFU ("Services for Unix" emulation does not allow
3253 * creating symlinks but does allow reading existing SFU
3254 * symlinks (it does allow both creating and reading SFU
3255 * style mknod and FIFOs though). When "mfsymlinks" and
3256 * "sfu" are both enabled at the same time, it allows
3257 * reading both types of symlinks, but will only create
3258 * them with mfsymlinks format. This allows better
3259 * Apple compatibility (probably better for Samba too)
3260 * while still recognizing old Windows style symlinks.
3262 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
3264 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
3267 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
3268 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
3272 cleanup_volume_info_contents(struct smb_vol *volume_info)
3274 kfree(volume_info->username);
3275 kzfree(volume_info->password);
3276 kfree(volume_info->UNC);
3277 kfree(volume_info->domainname);
3278 kfree(volume_info->iocharset);
3279 kfree(volume_info->prepath);
3283 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3287 cleanup_volume_info_contents(volume_info);
3292 #ifdef CONFIG_CIFS_DFS_UPCALL
3294 * cifs_build_path_to_root returns full path to root when we do not have an
3295 * exiting connection (tcon)
3298 build_unc_path_to_root(const struct smb_vol *vol,
3299 const struct cifs_sb_info *cifs_sb)
3301 char *full_path, *pos;
3302 unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
3303 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3305 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3306 if (full_path == NULL)
3307 return ERR_PTR(-ENOMEM);
3309 strncpy(full_path, vol->UNC, unc_len);
3310 pos = full_path + unc_len;
3313 *pos = CIFS_DIR_SEP(cifs_sb);
3314 strncpy(pos + 1, vol->prepath, pplen);
3318 *pos = '\0'; /* add trailing null */
3319 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3320 cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
3325 * Perform a dfs referral query for a share and (optionally) prefix
3327 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3328 * to a string containing updated options for the submount. Otherwise it
3329 * will be left untouched.
3331 * Returns the rc from get_dfs_path to the caller, which can be used to
3332 * determine whether there were referrals.
3335 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
3336 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3340 unsigned int num_referrals = 0;
3341 struct dfs_info3_param *referrals = NULL;
3342 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3344 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3345 if (IS_ERR(full_path))
3346 return PTR_ERR(full_path);
3348 /* For DFS paths, skip the first '\' of the UNC */
3349 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3351 rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls,
3352 &num_referrals, &referrals, cifs_remap(cifs_sb));
3354 if (!rc && num_referrals > 0) {
3355 char *fake_devname = NULL;
3357 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3358 full_path + 1, referrals,
3361 free_dfs_info_array(referrals, num_referrals);
3363 if (IS_ERR(mdata)) {
3364 rc = PTR_ERR(mdata);
3367 cleanup_volume_info_contents(volume_info);
3368 rc = cifs_setup_volume_info(volume_info, mdata,
3371 kfree(fake_devname);
3372 kfree(cifs_sb->mountdata);
3373 cifs_sb->mountdata = mdata;
3381 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3382 const char *devname)
3386 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3389 if (volume_info->nullauth) {
3390 cifs_dbg(FYI, "Anonymous login\n");
3391 kfree(volume_info->username);
3392 volume_info->username = NULL;
3393 } else if (volume_info->username) {
3394 /* BB fixme parse for domain name here */
3395 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
3397 cifs_dbg(VFS, "No username specified\n");
3398 /* In userspace mount helper we can get user name from alternate
3399 locations such as env variables and files on disk */
3403 /* this is needed for ASCII cp to Unicode converts */
3404 if (volume_info->iocharset == NULL) {
3405 /* load_nls_default cannot return null */
3406 volume_info->local_nls = load_nls_default();
3408 volume_info->local_nls = load_nls(volume_info->iocharset);
3409 if (volume_info->local_nls == NULL) {
3410 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
3411 volume_info->iocharset);
3420 cifs_get_volume_info(char *mount_data, const char *devname)
3423 struct smb_vol *volume_info;
3425 volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
3427 return ERR_PTR(-ENOMEM);
3429 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3431 cifs_cleanup_volume_info(volume_info);
3432 volume_info = ERR_PTR(rc);
3439 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3443 struct cifs_ses *ses;
3444 struct cifs_tcon *tcon;
3445 struct TCP_Server_Info *server;
3447 struct tcon_link *tlink;
3448 #ifdef CONFIG_CIFS_DFS_UPCALL
3449 int referral_walks_count = 0;
3452 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs");
3456 #ifdef CONFIG_CIFS_DFS_UPCALL
3458 /* cleanup activities if we're chasing a referral */
3459 if (referral_walks_count) {
3461 cifs_put_tcon(tcon);
3463 cifs_put_smb_ses(ses);
3477 /* get a reference to a tcp session */
3478 server = cifs_get_tcp_session(volume_info);
3479 if (IS_ERR(server)) {
3480 rc = PTR_ERR(server);
3481 bdi_destroy(&cifs_sb->bdi);
3485 /* get a reference to a SMB session */
3486 ses = cifs_get_smb_ses(server, volume_info);
3490 goto mount_fail_check;
3493 /* search for existing tcon to this server share */
3494 tcon = cifs_get_tcon(ses, volume_info);
3498 goto remote_path_check;
3501 /* tell server which Unix caps we support */
3502 if (cap_unix(tcon->ses)) {
3503 /* reset of caps checks mount to see if unix extensions
3504 disabled for just this mount */
3505 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3506 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3507 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3508 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3510 goto mount_fail_check;
3513 tcon->unix_ext = 0; /* server does not support them */
3515 /* do not care if a following call succeed - informational */
3516 if (!tcon->ipc && server->ops->qfs_tcon)
3517 server->ops->qfs_tcon(xid, tcon);
3519 cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info);
3520 cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info);
3522 /* tune readahead according to rsize */
3523 cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3526 #ifdef CONFIG_CIFS_DFS_UPCALL
3528 * Perform an unconditional check for whether there are DFS
3529 * referrals for this path without prefix, to provide support
3530 * for DFS referrals from w2k8 servers which don't seem to respond
3531 * with PATH_NOT_COVERED to requests that include the prefix.
3532 * Chase the referral if found, otherwise continue normally.
3534 if (referral_walks_count == 0) {
3535 int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb,
3538 referral_walks_count++;
3539 goto try_mount_again;
3544 /* check if a whole path is not remote */
3546 if (!server->ops->is_path_accessible) {
3548 goto mount_fail_check;
3551 * cifs_build_path_to_root works only when we have a valid tcon
3553 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3554 if (full_path == NULL) {
3556 goto mount_fail_check;
3558 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
3560 if (rc != 0 && rc != -EREMOTE) {
3562 goto mount_fail_check;
3567 /* get referral if needed */
3568 if (rc == -EREMOTE) {
3569 #ifdef CONFIG_CIFS_DFS_UPCALL
3570 if (referral_walks_count > MAX_NESTED_LINKS) {
3572 * BB: when we implement proper loop detection,
3573 * we will remove this check. But now we need it
3574 * to prevent an indefinite loop if 'DFS tree' is
3575 * misconfigured (i.e. has loops).
3578 goto mount_fail_check;
3581 rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true);
3584 referral_walks_count++;
3585 goto try_mount_again;
3587 goto mount_fail_check;
3588 #else /* No DFS support, return error on mount */
3594 goto mount_fail_check;
3596 /* now, hang the tcon off of the superblock */
3597 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3598 if (tlink == NULL) {
3600 goto mount_fail_check;
3603 tlink->tl_uid = ses->linux_uid;
3604 tlink->tl_tcon = tcon;
3605 tlink->tl_time = jiffies;
3606 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3607 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3609 cifs_sb->master_tlink = tlink;
3610 spin_lock(&cifs_sb->tlink_tree_lock);
3611 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3612 spin_unlock(&cifs_sb->tlink_tree_lock);
3614 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
3618 /* on error free sesinfo and tcon struct if needed */
3620 /* If find_unc succeeded then rc == 0 so we can not end */
3621 /* up accidentally freeing someone elses tcon struct */
3623 cifs_put_tcon(tcon);
3625 cifs_put_smb_ses(ses);
3627 cifs_put_tcp_session(server);
3628 bdi_destroy(&cifs_sb->bdi);
3637 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3638 * pointer may be NULL.
3641 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
3642 const char *tree, struct cifs_tcon *tcon,
3643 const struct nls_table *nls_codepage)
3645 struct smb_hdr *smb_buffer;
3646 struct smb_hdr *smb_buffer_response;
3649 unsigned char *bcc_ptr;
3652 __u16 bytes_left, count;
3657 smb_buffer = cifs_buf_get();
3658 if (smb_buffer == NULL)
3661 smb_buffer_response = smb_buffer;
3663 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3664 NULL /*no tid */ , 4 /*wct */ );
3666 smb_buffer->Mid = get_next_mid(ses->server);
3667 smb_buffer->Uid = ses->Suid;
3668 pSMB = (TCONX_REQ *) smb_buffer;
3669 pSMBr = (TCONX_RSP *) smb_buffer_response;
3671 pSMB->AndXCommand = 0xFF;
3672 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3673 bcc_ptr = &pSMB->Password[0];
3674 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3675 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3676 *bcc_ptr = 0; /* password is null byte */
3677 bcc_ptr++; /* skip password */
3678 /* already aligned so no need to do it below */
3680 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3681 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3682 specified as required (when that support is added to
3683 the vfs in the future) as only NTLM or the much
3684 weaker LANMAN (which we do not send by default) is accepted
3685 by Samba (not sure whether other servers allow
3686 NTLMv2 password here) */
3687 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3688 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3689 (ses->sectype == LANMAN))
3690 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3691 ses->server->sec_mode &
3692 SECMODE_PW_ENCRYPT ? true : false,
3695 #endif /* CIFS_WEAK_PW_HASH */
3696 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3697 bcc_ptr, nls_codepage);
3699 cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
3701 cifs_buf_release(smb_buffer);
3705 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3706 if (ses->capabilities & CAP_UNICODE) {
3707 /* must align unicode strings */
3708 *bcc_ptr = 0; /* null byte password */
3713 if (ses->server->sign)
3714 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3716 if (ses->capabilities & CAP_STATUS32) {
3717 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3719 if (ses->capabilities & CAP_DFS) {
3720 smb_buffer->Flags2 |= SMBFLG2_DFS;
3722 if (ses->capabilities & CAP_UNICODE) {
3723 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3725 cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
3726 6 /* max utf8 char length in bytes */ *
3727 (/* server len*/ + 256 /* share len */), nls_codepage);
3728 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3729 bcc_ptr += 2; /* skip trailing null */
3730 } else { /* ASCII */
3731 strcpy(bcc_ptr, tree);
3732 bcc_ptr += strlen(tree) + 1;
3734 strcpy(bcc_ptr, "?????");
3735 bcc_ptr += strlen("?????");
3737 count = bcc_ptr - &pSMB->Password[0];
3738 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3739 pSMB->hdr.smb_buf_length) + count);
3740 pSMB->ByteCount = cpu_to_le16(count);
3742 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3745 /* above now done in SendReceive */
3746 if ((rc == 0) && (tcon != NULL)) {
3749 tcon->tidStatus = CifsGood;
3750 tcon->need_reconnect = false;
3751 tcon->tid = smb_buffer_response->Tid;
3752 bcc_ptr = pByteArea(smb_buffer_response);
3753 bytes_left = get_bcc(smb_buffer_response);
3754 length = strnlen(bcc_ptr, bytes_left - 2);
3755 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3761 /* skip service field (NB: this field is always ASCII) */
3763 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3764 (bcc_ptr[2] == 'C')) {
3765 cifs_dbg(FYI, "IPC connection\n");
3768 } else if (length == 2) {
3769 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3770 /* the most common case */
3771 cifs_dbg(FYI, "disk share connection\n");
3774 bcc_ptr += length + 1;
3775 bytes_left -= (length + 1);
3776 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
3778 /* mostly informational -- no need to fail on error here */
3779 kfree(tcon->nativeFileSystem);
3780 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
3781 bytes_left, is_unicode,
3784 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
3786 if ((smb_buffer_response->WordCount == 3) ||
3787 (smb_buffer_response->WordCount == 7))
3788 /* field is in same location */
3789 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3792 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
3793 } else if ((rc == 0) && tcon == NULL) {
3794 /* all we need to save for IPC$ connection */
3795 ses->ipc_tid = smb_buffer_response->Tid;
3798 cifs_buf_release(smb_buffer);
3802 static void delayed_free(struct rcu_head *p)
3804 struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
3805 unload_nls(sbi->local_nls);
3810 cifs_umount(struct cifs_sb_info *cifs_sb)
3812 struct rb_root *root = &cifs_sb->tlink_tree;
3813 struct rb_node *node;
3814 struct tcon_link *tlink;
3816 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3818 spin_lock(&cifs_sb->tlink_tree_lock);
3819 while ((node = rb_first(root))) {
3820 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3821 cifs_get_tlink(tlink);
3822 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3823 rb_erase(node, root);
3825 spin_unlock(&cifs_sb->tlink_tree_lock);
3826 cifs_put_tlink(tlink);
3827 spin_lock(&cifs_sb->tlink_tree_lock);
3829 spin_unlock(&cifs_sb->tlink_tree_lock);
3831 bdi_destroy(&cifs_sb->bdi);
3832 kfree(cifs_sb->mountdata);
3833 call_rcu(&cifs_sb->rcu, delayed_free);
3837 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
3840 struct TCP_Server_Info *server = ses->server;
3842 if (!server->ops->need_neg || !server->ops->negotiate)
3845 /* only send once per connect */
3846 if (!server->ops->need_neg(server))
3849 set_credits(server, 1);
3851 rc = server->ops->negotiate(xid, ses);
3853 spin_lock(&GlobalMid_Lock);
3854 if (server->tcpStatus == CifsNeedNegotiate)
3855 server->tcpStatus = CifsGood;
3858 spin_unlock(&GlobalMid_Lock);
3865 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
3866 struct nls_table *nls_info)
3869 struct TCP_Server_Info *server = ses->server;
3871 ses->capabilities = server->capabilities;
3872 if (linuxExtEnabled == 0)
3873 ses->capabilities &= (~server->vals->cap_unix);
3875 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
3876 server->sec_mode, server->capabilities, server->timeAdj);
3878 if (server->ops->sess_setup)
3879 rc = server->ops->sess_setup(xid, ses, nls_info);
3882 cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc);
3888 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
3890 vol->sectype = ses->sectype;
3892 /* krb5 is special, since we don't need username or pw */
3893 if (vol->sectype == Kerberos)
3896 return cifs_set_cifscreds(vol, ses);
3899 static struct cifs_tcon *
3900 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
3903 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3904 struct cifs_ses *ses;
3905 struct cifs_tcon *tcon = NULL;
3906 struct smb_vol *vol_info;
3908 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3909 if (vol_info == NULL)
3910 return ERR_PTR(-ENOMEM);
3912 vol_info->local_nls = cifs_sb->local_nls;
3913 vol_info->linux_uid = fsuid;
3914 vol_info->cred_uid = fsuid;
3915 vol_info->UNC = master_tcon->treeName;
3916 vol_info->retry = master_tcon->retry;
3917 vol_info->nocase = master_tcon->nocase;
3918 vol_info->local_lease = master_tcon->local_lease;
3919 vol_info->no_linux_ext = !master_tcon->unix_ext;
3920 vol_info->sectype = master_tcon->ses->sectype;
3921 vol_info->sign = master_tcon->ses->sign;
3923 rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
3929 /* get a reference for the same TCP session */
3930 spin_lock(&cifs_tcp_ses_lock);
3931 ++master_tcon->ses->server->srv_count;
3932 spin_unlock(&cifs_tcp_ses_lock);
3934 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3936 tcon = (struct cifs_tcon *)ses;
3937 cifs_put_tcp_session(master_tcon->ses->server);
3941 tcon = cifs_get_tcon(ses, vol_info);
3943 cifs_put_smb_ses(ses);
3948 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3950 kfree(vol_info->username);
3951 kfree(vol_info->password);
3958 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3960 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3963 /* find and return a tlink with given uid */
3964 static struct tcon_link *
3965 tlink_rb_search(struct rb_root *root, kuid_t uid)
3967 struct rb_node *node = root->rb_node;
3968 struct tcon_link *tlink;
3971 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3973 if (uid_gt(tlink->tl_uid, uid))
3974 node = node->rb_left;
3975 else if (uid_lt(tlink->tl_uid, uid))
3976 node = node->rb_right;
3983 /* insert a tcon_link into the tree */
3985 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3987 struct rb_node **new = &(root->rb_node), *parent = NULL;
3988 struct tcon_link *tlink;
3991 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3994 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
3995 new = &((*new)->rb_left);
3997 new = &((*new)->rb_right);
4000 rb_link_node(&new_tlink->tl_rbnode, parent, new);
4001 rb_insert_color(&new_tlink->tl_rbnode, root);
4005 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
4008 * If the superblock doesn't refer to a multiuser mount, then just return
4009 * the master tcon for the mount.
4011 * First, search the rbtree for an existing tcon for this fsuid. If one
4012 * exists, then check to see if it's pending construction. If it is then wait
4013 * for construction to complete. Once it's no longer pending, check to see if
4014 * it failed and either return an error or retry construction, depending on
4017 * If one doesn't exist then insert a new tcon_link struct into the tree and
4018 * try to construct a new one.
4021 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
4024 kuid_t fsuid = current_fsuid();
4025 struct tcon_link *tlink, *newtlink;
4027 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
4028 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
4030 spin_lock(&cifs_sb->tlink_tree_lock);
4031 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4033 cifs_get_tlink(tlink);
4034 spin_unlock(&cifs_sb->tlink_tree_lock);
4036 if (tlink == NULL) {
4037 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4038 if (newtlink == NULL)
4039 return ERR_PTR(-ENOMEM);
4040 newtlink->tl_uid = fsuid;
4041 newtlink->tl_tcon = ERR_PTR(-EACCES);
4042 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
4043 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
4044 cifs_get_tlink(newtlink);
4046 spin_lock(&cifs_sb->tlink_tree_lock);
4047 /* was one inserted after previous search? */
4048 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
4050 cifs_get_tlink(tlink);
4051 spin_unlock(&cifs_sb->tlink_tree_lock);
4053 goto wait_for_construction;
4056 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4057 spin_unlock(&cifs_sb->tlink_tree_lock);
4059 wait_for_construction:
4060 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
4061 TASK_INTERRUPTIBLE);
4063 cifs_put_tlink(tlink);
4064 return ERR_PTR(-ERESTARTSYS);
4067 /* if it's good, return it */
4068 if (!IS_ERR(tlink->tl_tcon))
4071 /* return error if we tried this already recently */
4072 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
4073 cifs_put_tlink(tlink);
4074 return ERR_PTR(-EACCES);
4077 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
4078 goto wait_for_construction;
4081 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
4082 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
4083 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
4085 if (IS_ERR(tlink->tl_tcon)) {
4086 cifs_put_tlink(tlink);
4087 return ERR_PTR(-EACCES);
4094 * periodic workqueue job that scans tcon_tree for a superblock and closes
4098 cifs_prune_tlinks(struct work_struct *work)
4100 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
4102 struct rb_root *root = &cifs_sb->tlink_tree;
4103 struct rb_node *node = rb_first(root);
4104 struct rb_node *tmp;
4105 struct tcon_link *tlink;
4108 * Because we drop the spinlock in the loop in order to put the tlink
4109 * it's not guarded against removal of links from the tree. The only
4110 * places that remove entries from the tree are this function and
4111 * umounts. Because this function is non-reentrant and is canceled
4112 * before umount can proceed, this is safe.
4114 spin_lock(&cifs_sb->tlink_tree_lock);
4115 node = rb_first(root);
4116 while (node != NULL) {
4118 node = rb_next(tmp);
4119 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
4121 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
4122 atomic_read(&tlink->tl_count) != 0 ||
4123 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
4126 cifs_get_tlink(tlink);
4127 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4128 rb_erase(tmp, root);
4130 spin_unlock(&cifs_sb->tlink_tree_lock);
4131 cifs_put_tlink(tlink);
4132 spin_lock(&cifs_sb->tlink_tree_lock);
4134 spin_unlock(&cifs_sb->tlink_tree_lock);
4136 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,