blob: 34cea27983335fbf9dea43697cc8663ecf5aa091 [file] [log] [blame]
Jeff Layton23db65f2012-05-15 12:20:51 -04001/*
2 * SMB1 (CIFS) version specific operations
3 *
4 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License v2 as published
8 * by the Free Software Foundation.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
Pavel Shilovsky24985c52012-09-18 16:20:28 -070020#include <linux/pagemap.h>
Pavel Shilovsky76ec5e32012-09-18 16:20:33 -070021#include <linux/vfs.h>
Jeff Layton23db65f2012-05-15 12:20:51 -040022#include "cifsglob.h"
Jeff Layton121b0462012-05-15 12:21:10 -040023#include "cifsproto.h"
24#include "cifs_debug.h"
Pavel Shilovsky106dc532012-02-28 14:23:34 +030025#include "cifspdu.h"
Jeff Layton121b0462012-05-15 12:21:10 -040026
27/*
28 * An NT cancel request header looks just like the original request except:
29 *
30 * The Command is SMB_COM_NT_CANCEL
31 * The WordCount is zeroed out
32 * The ByteCount is zeroed out
33 *
34 * This function mangles an existing request buffer into a
35 * SMB_COM_NT_CANCEL request and then sends it.
36 */
37static int
38send_nt_cancel(struct TCP_Server_Info *server, void *buf,
39 struct mid_q_entry *mid)
40{
41 int rc = 0;
42 struct smb_hdr *in_buf = (struct smb_hdr *)buf;
43
44 /* -4 for RFC1001 length and +2 for BCC field */
45 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
46 in_buf->Command = SMB_COM_NT_CANCEL;
47 in_buf->WordCount = 0;
48 put_bcc(0, in_buf);
49
50 mutex_lock(&server->srv_mutex);
51 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
52 if (rc) {
53 mutex_unlock(&server->srv_mutex);
54 return rc;
55 }
56 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
57 mutex_unlock(&server->srv_mutex);
58
59 cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
60 in_buf->Mid, rc);
61
62 return rc;
63}
Jeff Layton23db65f2012-05-15 12:20:51 -040064
Pavel Shilovsky55157df2012-02-28 14:04:17 +030065static bool
66cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
67{
Pavel Shilovsky4b4de762012-09-18 16:20:26 -070068 return ob1->fid.netfid == ob2->fid.netfid;
Pavel Shilovsky55157df2012-02-28 14:04:17 +030069}
70
Pavel Shilovskyeb378712012-05-17 13:02:51 +040071static unsigned int
72cifs_read_data_offset(char *buf)
73{
74 READ_RSP *rsp = (READ_RSP *)buf;
75 return le16_to_cpu(rsp->DataOffset);
76}
77
78static unsigned int
79cifs_read_data_length(char *buf)
80{
81 READ_RSP *rsp = (READ_RSP *)buf;
82 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
83 le16_to_cpu(rsp->DataLength);
84}
85
Pavel Shilovsky8aa26f32012-05-17 13:25:35 +040086static struct mid_q_entry *
87cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
88{
89 struct smb_hdr *buf = (struct smb_hdr *)buffer;
90 struct mid_q_entry *mid;
91
92 spin_lock(&GlobalMid_Lock);
93 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
94 if (mid->mid == buf->Mid &&
95 mid->mid_state == MID_REQUEST_SUBMITTED &&
96 le16_to_cpu(mid->command) == buf->Command) {
97 spin_unlock(&GlobalMid_Lock);
98 return mid;
99 }
100 }
101 spin_unlock(&GlobalMid_Lock);
102 return NULL;
103}
104
Pavel Shilovsky45275782012-05-17 17:53:29 +0400105static void
Pavel Shilovskya891f0f2012-05-23 16:14:34 +0400106cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
107 const int optype)
Pavel Shilovsky45275782012-05-17 17:53:29 +0400108{
109 spin_lock(&server->req_lock);
110 server->credits += add;
111 server->in_flight--;
112 spin_unlock(&server->req_lock);
113 wake_up(&server->request_q);
114}
115
116static void
117cifs_set_credits(struct TCP_Server_Info *server, const int val)
118{
119 spin_lock(&server->req_lock);
120 server->credits = val;
121 server->oplocks = val > 1 ? enable_oplocks : false;
122 spin_unlock(&server->req_lock);
123}
124
125static int *
Pavel Shilovskya891f0f2012-05-23 16:14:34 +0400126cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
Pavel Shilovsky45275782012-05-17 17:53:29 +0400127{
128 return &server->credits;
129}
130
Pavel Shilovskya891f0f2012-05-23 16:14:34 +0400131static unsigned int
132cifs_get_credits(struct mid_q_entry *mid)
133{
134 return 1;
135}
136
Pavel Shilovsky88257362012-05-23 14:01:59 +0400137/*
138 * Find a free multiplex id (SMB mid). Otherwise there could be
139 * mid collisions which might cause problems, demultiplexing the
140 * wrong response to this request. Multiplex ids could collide if
141 * one of a series requests takes much longer than the others, or
142 * if a very large number of long lived requests (byte range
143 * locks or FindNotify requests) are pending. No more than
144 * 64K-1 requests can be outstanding at one time. If no
145 * mids are available, return zero. A future optimization
146 * could make the combination of mids and uid the key we use
147 * to demultiplex on (rather than mid alone).
148 * In addition to the above check, the cifs demultiplex
149 * code already used the command code as a secondary
150 * check of the frame and if signing is negotiated the
151 * response would be discarded if the mid were the same
152 * but the signature was wrong. Since the mid is not put in the
153 * pending queue until later (when it is about to be dispatched)
154 * we do have to limit the number of outstanding requests
155 * to somewhat less than 64K-1 although it is hard to imagine
156 * so many threads being in the vfs at one time.
157 */
158static __u64
159cifs_get_next_mid(struct TCP_Server_Info *server)
160{
161 __u64 mid = 0;
162 __u16 last_mid, cur_mid;
163 bool collision;
164
165 spin_lock(&GlobalMid_Lock);
166
167 /* mid is 16 bit only for CIFS/SMB */
168 cur_mid = (__u16)((server->CurrentMid) & 0xffff);
169 /* we do not want to loop forever */
170 last_mid = cur_mid;
171 cur_mid++;
172
173 /*
174 * This nested loop looks more expensive than it is.
175 * In practice the list of pending requests is short,
176 * fewer than 50, and the mids are likely to be unique
177 * on the first pass through the loop unless some request
178 * takes longer than the 64 thousand requests before it
179 * (and it would also have to have been a request that
180 * did not time out).
181 */
182 while (cur_mid != last_mid) {
183 struct mid_q_entry *mid_entry;
184 unsigned int num_mids;
185
186 collision = false;
187 if (cur_mid == 0)
188 cur_mid++;
189
190 num_mids = 0;
191 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
192 ++num_mids;
193 if (mid_entry->mid == cur_mid &&
194 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
195 /* This mid is in use, try a different one */
196 collision = true;
197 break;
198 }
199 }
200
201 /*
202 * if we have more than 32k mids in the list, then something
203 * is very wrong. Possibly a local user is trying to DoS the
204 * box by issuing long-running calls and SIGKILL'ing them. If
205 * we get to 2^16 mids then we're in big trouble as this
206 * function could loop forever.
207 *
208 * Go ahead and assign out the mid in this situation, but force
209 * an eventual reconnect to clean out the pending_mid_q.
210 */
211 if (num_mids > 32768)
212 server->tcpStatus = CifsNeedReconnect;
213
214 if (!collision) {
215 mid = (__u64)cur_mid;
216 server->CurrentMid = mid;
217 break;
218 }
219 cur_mid++;
220 }
221 spin_unlock(&GlobalMid_Lock);
222 return mid;
223}
224
Pavel Shilovsky316cf942012-05-23 14:31:03 +0400225/*
226 return codes:
227 0 not a transact2, or all data present
228 >0 transact2 with that much data missing
229 -EINVAL invalid transact2
230 */
231static int
232check2ndT2(char *buf)
233{
234 struct smb_hdr *pSMB = (struct smb_hdr *)buf;
235 struct smb_t2_rsp *pSMBt;
236 int remaining;
237 __u16 total_data_size, data_in_this_rsp;
238
239 if (pSMB->Command != SMB_COM_TRANSACTION2)
240 return 0;
241
242 /* check for plausible wct, bcc and t2 data and parm sizes */
243 /* check for parm and data offset going beyond end of smb */
244 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
245 cFYI(1, "invalid transact2 word count");
246 return -EINVAL;
247 }
248
249 pSMBt = (struct smb_t2_rsp *)pSMB;
250
251 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
252 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
253
254 if (total_data_size == data_in_this_rsp)
255 return 0;
256 else if (total_data_size < data_in_this_rsp) {
257 cFYI(1, "total data %d smaller than data in frame %d",
258 total_data_size, data_in_this_rsp);
259 return -EINVAL;
260 }
261
262 remaining = total_data_size - data_in_this_rsp;
263
264 cFYI(1, "missing %d bytes from transact2, check next response",
265 remaining);
266 if (total_data_size > CIFSMaxBufSize) {
267 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
268 total_data_size, CIFSMaxBufSize);
269 return -EINVAL;
270 }
271 return remaining;
272}
273
274static int
275coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
276{
277 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
278 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
279 char *data_area_of_tgt;
280 char *data_area_of_src;
281 int remaining;
282 unsigned int byte_count, total_in_tgt;
283 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
284
285 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
286 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
287
288 if (tgt_total_cnt != src_total_cnt)
289 cFYI(1, "total data count of primary and secondary t2 differ "
290 "source=%hu target=%hu", src_total_cnt, tgt_total_cnt);
291
292 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
293
294 remaining = tgt_total_cnt - total_in_tgt;
295
296 if (remaining < 0) {
297 cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
298 "total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
299 return -EPROTO;
300 }
301
302 if (remaining == 0) {
303 /* nothing to do, ignore */
304 cFYI(1, "no more data remains");
305 return 0;
306 }
307
308 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
309 if (remaining < total_in_src)
310 cFYI(1, "transact2 2nd response contains too much data");
311
312 /* find end of first SMB data area */
313 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
314 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
315
316 /* validate target area */
317 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
318 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
319
320 data_area_of_tgt += total_in_tgt;
321
322 total_in_tgt += total_in_src;
323 /* is the result too big for the field? */
324 if (total_in_tgt > USHRT_MAX) {
325 cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
326 return -EPROTO;
327 }
328 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
329
330 /* fix up the BCC */
331 byte_count = get_bcc(target_hdr);
332 byte_count += total_in_src;
333 /* is the result too big for the field? */
334 if (byte_count > USHRT_MAX) {
335 cFYI(1, "coalesced BCC too large (%u)", byte_count);
336 return -EPROTO;
337 }
338 put_bcc(byte_count, target_hdr);
339
340 byte_count = be32_to_cpu(target_hdr->smb_buf_length);
341 byte_count += total_in_src;
342 /* don't allow buffer to overflow */
343 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
344 cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
345 return -ENOBUFS;
346 }
347 target_hdr->smb_buf_length = cpu_to_be32(byte_count);
348
349 /* copy second buffer into end of first buffer */
350 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
351
352 if (remaining != total_in_src) {
353 /* more responses to go */
354 cFYI(1, "waiting for more secondary responses");
355 return 1;
356 }
357
358 /* we are done */
359 cFYI(1, "found the last secondary response");
360 return 0;
361}
362
363static bool
364cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
365 char *buf, int malformed)
366{
367 if (malformed)
368 return false;
369 if (check2ndT2(buf) <= 0)
370 return false;
371 mid->multiRsp = true;
372 if (mid->resp_buf) {
373 /* merge response - fix up 1st*/
374 malformed = coalesce_t2(buf, mid->resp_buf);
375 if (malformed > 0)
376 return true;
377 /* All parts received or packet is malformed. */
378 mid->multiEnd = true;
379 dequeue_mid(mid, malformed);
380 return true;
381 }
382 if (!server->large_buf) {
383 /*FIXME: switch to already allocated largebuf?*/
384 cERROR(1, "1st trans2 resp needs bigbuf");
385 } else {
386 /* Have first buffer */
387 mid->resp_buf = buf;
388 mid->large_buf = true;
389 server->bigbuf = NULL;
390 }
391 return true;
392}
393
Pavel Shilovsky286170a2012-05-25 10:43:58 +0400394static bool
395cifs_need_neg(struct TCP_Server_Info *server)
396{
397 return server->maxBuf == 0;
398}
399
400static int
401cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
402{
403 int rc;
404 rc = CIFSSMBNegotiate(xid, ses);
405 if (rc == -EAGAIN) {
406 /* retry only once on 1st time connection */
407 set_credits(ses->server, 1);
408 rc = CIFSSMBNegotiate(xid, ses);
409 if (rc == -EAGAIN)
410 rc = -EHOSTDOWN;
411 }
412 return rc;
413}
414
Pavel Shilovsky24985c52012-09-18 16:20:28 -0700415static unsigned int
416cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
417{
418 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
419 struct TCP_Server_Info *server = tcon->ses->server;
420 unsigned int wsize;
421
422 /* start with specified wsize, or default */
423 if (volume_info->wsize)
424 wsize = volume_info->wsize;
425 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
426 wsize = CIFS_DEFAULT_IOSIZE;
427 else
428 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
429
430 /* can server support 24-bit write sizes? (via UNIX extensions) */
431 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
432 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
433
434 /*
435 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
436 * Limit it to max buffer offered by the server, minus the size of the
437 * WRITEX header, not including the 4 byte RFC1001 length.
438 */
439 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
440 (!(server->capabilities & CAP_UNIX) &&
441 (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
442 wsize = min_t(unsigned int, wsize,
443 server->maxBuf - sizeof(WRITE_REQ) + 4);
444
Pavel Shilovsky24985c52012-09-18 16:20:28 -0700445 /* hard limit of CIFS_MAX_WSIZE */
446 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
447
448 return wsize;
449}
450
451static unsigned int
452cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
453{
454 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
455 struct TCP_Server_Info *server = tcon->ses->server;
456 unsigned int rsize, defsize;
457
458 /*
459 * Set default value...
460 *
461 * HACK alert! Ancient servers have very small buffers. Even though
462 * MS-CIFS indicates that servers are only limited by the client's
463 * bufsize for reads, testing against win98se shows that it throws
464 * INVALID_PARAMETER errors if you try to request too large a read.
465 * OS/2 just sends back short reads.
466 *
467 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
468 * it can't handle a read request larger than its MaxBufferSize either.
469 */
470 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
471 defsize = CIFS_DEFAULT_IOSIZE;
472 else if (server->capabilities & CAP_LARGE_READ_X)
473 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
474 else
475 defsize = server->maxBuf - sizeof(READ_RSP);
476
477 rsize = volume_info->rsize ? volume_info->rsize : defsize;
478
479 /*
480 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
481 * the client's MaxBufferSize.
482 */
483 if (!(server->capabilities & CAP_LARGE_READ_X))
484 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
485
Pavel Shilovsky24985c52012-09-18 16:20:28 -0700486 /* hard limit of CIFS_MAX_RSIZE */
487 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
488
489 return rsize;
490}
491
Pavel Shilovskyaf4281d2012-05-27 20:48:35 +0400492static void
493cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
494{
495 CIFSSMBQFSDeviceInfo(xid, tcon);
496 CIFSSMBQFSAttributeInfo(xid, tcon);
497}
498
Pavel Shilovsky68889f22012-05-25 14:40:22 +0400499static int
500cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
501 struct cifs_sb_info *cifs_sb, const char *full_path)
502{
503 int rc;
504 FILE_ALL_INFO *file_info;
505
506 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
507 if (file_info == NULL)
508 return -ENOMEM;
509
510 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
511 0 /* not legacy */, cifs_sb->local_nls,
512 cifs_sb->mnt_cifs_flags &
513 CIFS_MOUNT_MAP_SPECIAL_CHR);
514
515 if (rc == -EOPNOTSUPP || rc == -EINVAL)
516 rc = SMBQueryInformation(xid, tcon, full_path, file_info,
517 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
518 CIFS_MOUNT_MAP_SPECIAL_CHR);
519 kfree(file_info);
520 return rc;
521}
522
Pavel Shilovsky1208ef12012-05-27 17:34:43 +0400523static int
524cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
525 struct cifs_sb_info *cifs_sb, const char *full_path,
526 FILE_ALL_INFO *data, bool *adjustTZ)
527{
528 int rc;
529
530 /* could do find first instead but this returns more info */
531 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
532 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
533 CIFS_MOUNT_MAP_SPECIAL_CHR);
534 /*
535 * BB optimize code so we do not make the above call when server claims
536 * no NT SMB support and the above call failed at least once - set flag
537 * in tcon or mount.
538 */
539 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
540 rc = SMBQueryInformation(xid, tcon, full_path, data,
541 cifs_sb->local_nls,
542 cifs_sb->mnt_cifs_flags &
543 CIFS_MOUNT_MAP_SPECIAL_CHR);
544 *adjustTZ = true;
545 }
546 return rc;
547}
548
549static int
550cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
551 struct cifs_sb_info *cifs_sb, const char *full_path,
552 u64 *uniqueid, FILE_ALL_INFO *data)
553{
554 /*
555 * We can not use the IndexNumber field by default from Windows or
556 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
557 * CIFS spec claims that this value is unique within the scope of a
558 * share, and the windows docs hint that it's actually unique
559 * per-machine.
560 *
561 * There may be higher info levels that work but are there Windows
562 * server or network appliances for which IndexNumber field is not
563 * guaranteed unique?
564 */
565 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
566 cifs_sb->local_nls,
567 cifs_sb->mnt_cifs_flags &
568 CIFS_MOUNT_MAP_SPECIAL_CHR);
569}
570
Pavel Shilovsky4ad65042012-09-18 16:20:26 -0700571static int
572cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
573 struct cifs_fid *fid, FILE_ALL_INFO *data)
574{
575 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
576}
577
Pavel Shilovsky9224dfc2012-05-27 20:39:52 +0400578static char *
579cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
580 struct cifs_tcon *tcon)
581{
582 int pplen = vol->prepath ? strlen(vol->prepath) : 0;
583 int dfsplen;
584 char *full_path = NULL;
585
586 /* if no prefix path, simply set path to the root of share to "" */
587 if (pplen == 0) {
588 full_path = kzalloc(1, GFP_KERNEL);
589 return full_path;
590 }
591
592 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
593 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
594 else
595 dfsplen = 0;
596
597 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
598 if (full_path == NULL)
599 return full_path;
600
601 if (dfsplen)
602 strncpy(full_path, tcon->treeName, dfsplen);
603 strncpy(full_path + dfsplen, vol->prepath, pplen);
604 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
605 full_path[dfsplen + pplen] = 0; /* add trailing null */
606 return full_path;
607}
608
Pavel Shilovsky44c58182012-05-28 14:16:31 +0400609static void
610cifs_clear_stats(struct cifs_tcon *tcon)
611{
612#ifdef CONFIG_CIFS_STATS
613 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
614 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
615 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
616 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
617 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
618 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
619 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
620 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
621 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
622 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
623 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
624 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
625 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
626 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
627 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
628 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
629 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
630 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
631 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
632 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
633 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
634#endif
635}
636
637static void
638cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
639{
640#ifdef CONFIG_CIFS_STATS
641 seq_printf(m, " Oplocks breaks: %d",
642 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
643 seq_printf(m, "\nReads: %d Bytes: %llu",
644 atomic_read(&tcon->stats.cifs_stats.num_reads),
645 (long long)(tcon->bytes_read));
646 seq_printf(m, "\nWrites: %d Bytes: %llu",
647 atomic_read(&tcon->stats.cifs_stats.num_writes),
648 (long long)(tcon->bytes_written));
649 seq_printf(m, "\nFlushes: %d",
650 atomic_read(&tcon->stats.cifs_stats.num_flushes));
651 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
652 atomic_read(&tcon->stats.cifs_stats.num_locks),
653 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
654 atomic_read(&tcon->stats.cifs_stats.num_symlinks));
655 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
656 atomic_read(&tcon->stats.cifs_stats.num_opens),
657 atomic_read(&tcon->stats.cifs_stats.num_closes),
658 atomic_read(&tcon->stats.cifs_stats.num_deletes));
659 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
660 atomic_read(&tcon->stats.cifs_stats.num_posixopens),
661 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
662 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
663 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
664 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
665 seq_printf(m, "\nRenames: %d T2 Renames %d",
666 atomic_read(&tcon->stats.cifs_stats.num_renames),
667 atomic_read(&tcon->stats.cifs_stats.num_t2renames));
668 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
669 atomic_read(&tcon->stats.cifs_stats.num_ffirst),
670 atomic_read(&tcon->stats.cifs_stats.num_fnext),
671 atomic_read(&tcon->stats.cifs_stats.num_fclose));
672#endif
673}
674
Pavel Shilovskyf4367202012-03-17 11:41:12 +0300675static void
676cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
677 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
678 const unsigned int xid)
679{
680 FILE_BASIC_INFO info;
681 struct cifsInodeInfo *cifsInode;
682 u32 dosattrs;
683 int rc;
684
685 memset(&info, 0, sizeof(info));
686 cifsInode = CIFS_I(inode);
687 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
688 info.Attributes = cpu_to_le32(dosattrs);
689 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
690 cifs_sb->mnt_cifs_flags &
691 CIFS_MOUNT_MAP_SPECIAL_CHR);
692 if (rc == 0)
693 cifsInode->cifsAttrs = dosattrs;
694}
695
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700696static int
697cifs_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
698 int disposition, int desired_access, int create_options,
699 struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
700 struct cifs_sb_info *cifs_sb)
701{
702 if (!(tcon->ses->capabilities & CAP_NT_SMBS))
703 return SMBLegacyOpen(xid, tcon, path, disposition,
Pavel Shilovsky25364132012-09-18 16:20:27 -0700704 desired_access, create_options,
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700705 &fid->netfid, oplock, buf,
706 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
707 & CIFS_MOUNT_MAP_SPECIAL_CHR);
708 return CIFSSMBOpen(xid, tcon, path, disposition, desired_access,
709 create_options, &fid->netfid, oplock, buf,
710 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
711 CIFS_MOUNT_MAP_SPECIAL_CHR);
712}
713
714static void
715cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
716{
717 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
718 cfile->fid.netfid = fid->netfid;
719 cifs_set_oplock_level(cinode, oplock);
720 cinode->can_cache_brlcks = cinode->clientCanCacheAll;
721}
722
Pavel Shilovsky760ad0c2012-09-25 11:00:07 +0400723static void
Pavel Shilovsky0ff78a22012-09-18 16:20:26 -0700724cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
725 struct cifs_fid *fid)
726{
Pavel Shilovsky760ad0c2012-09-25 11:00:07 +0400727 CIFSSMBClose(xid, tcon, fid->netfid);
Pavel Shilovsky0ff78a22012-09-18 16:20:26 -0700728}
729
Pavel Shilovsky1d8c4c02012-09-18 16:20:27 -0700730static int
731cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
732 struct cifs_fid *fid)
733{
734 return CIFSSMBFlush(xid, tcon, fid->netfid);
735}
736
Pavel Shilovskyf9c6e232012-09-18 16:20:29 -0700737static int
738cifs_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
739 struct cifs_io_parms *parms, unsigned int *bytes_read,
740 char **buf, int *buf_type)
741{
742 parms->netfid = cfile->fid.netfid;
743 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
744}
745
Pavel Shilovskyba9ad7252012-09-18 16:20:30 -0700746static int
747cifs_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
748 struct cifs_io_parms *parms, unsigned int *written,
749 struct kvec *iov, unsigned long nr_segs)
750{
751
752 parms->netfid = cfile->fid.netfid;
753 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
754}
755
Pavel Shilovsky6bdf6db2012-09-18 16:20:32 -0700756static int
757smb_set_file_info(struct inode *inode, const char *full_path,
758 FILE_BASIC_INFO *buf, const unsigned int xid)
759{
760 int oplock = 0;
761 int rc;
762 __u16 netfid;
763 __u32 netpid;
764 struct cifsFileInfo *open_file;
765 struct cifsInodeInfo *cinode = CIFS_I(inode);
766 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
767 struct tcon_link *tlink = NULL;
768 struct cifs_tcon *tcon;
Pavel Shilovsky6bdf6db2012-09-18 16:20:32 -0700769
770 /* if the file is already open for write, just use that fileid */
771 open_file = find_writable_file(cinode, true);
772 if (open_file) {
773 netfid = open_file->fid.netfid;
774 netpid = open_file->pid;
775 tcon = tlink_tcon(open_file->tlink);
776 goto set_via_filehandle;
777 }
778
779 tlink = cifs_sb_tlink(cifs_sb);
780 if (IS_ERR(tlink)) {
781 rc = PTR_ERR(tlink);
782 tlink = NULL;
783 goto out;
784 }
785 tcon = tlink_tcon(tlink);
786
787 /*
788 * NT4 apparently returns success on this call, but it doesn't really
789 * work.
790 */
791 if (!(tcon->ses->flags & CIFS_SES_NT4)) {
792 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf,
793 cifs_sb->local_nls,
794 cifs_sb->mnt_cifs_flags &
795 CIFS_MOUNT_MAP_SPECIAL_CHR);
796 if (rc == 0) {
797 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
798 goto out;
799 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
800 goto out;
801 }
802
803 cFYI(1, "calling SetFileInfo since SetPathInfo for times not supported "
804 "by this server");
805 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
806 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
807 &netfid, &oplock, NULL, cifs_sb->local_nls,
808 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
809
810 if (rc != 0) {
811 if (rc == -EIO)
812 rc = -EINVAL;
813 goto out;
814 }
815
816 netpid = current->tgid;
817
818set_via_filehandle:
Pavel Shilovskyc772aa92012-11-28 15:27:54 +0400819 rc = CIFSSMBSetFileInfo(xid, tcon, buf, netfid, netpid);
Pavel Shilovsky6bdf6db2012-09-18 16:20:32 -0700820 if (!rc)
821 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
822
823 if (open_file == NULL)
824 CIFSSMBClose(xid, tcon, netfid);
825 else
826 cifsFileInfo_put(open_file);
827out:
828 if (tlink != NULL)
829 cifs_put_tlink(tlink);
830 return rc;
831}
832
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700833static int
834cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
835 const char *path, struct cifs_sb_info *cifs_sb,
836 struct cifs_fid *fid, __u16 search_flags,
837 struct cifs_search_info *srch_inf)
838{
Shirish Pargaonkarc052e2b2012-09-28 12:21:14 -0500839 return CIFSFindFirst(xid, tcon, path, cifs_sb,
840 &fid->netfid, search_flags, srch_inf, true);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700841}
842
843static int
844cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
845 struct cifs_fid *fid, __u16 search_flags,
846 struct cifs_search_info *srch_inf)
847{
848 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
849}
850
851static int
852cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
853 struct cifs_fid *fid)
854{
855 return CIFSFindClose(xid, tcon, fid->netfid);
856}
857
Pavel Shilovsky95a3f2f2012-09-18 16:20:33 -0700858static int
859cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
860 struct cifsInodeInfo *cinode)
861{
862 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
863 LOCKING_ANDX_OPLOCK_RELEASE, false,
864 cinode->clientCanCacheRead ? 1 : 0);
865}
866
Pavel Shilovsky76ec5e32012-09-18 16:20:33 -0700867static int
868cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
869 struct kstatfs *buf)
870{
871 int rc = -EOPNOTSUPP;
872
873 buf->f_type = CIFS_MAGIC_NUMBER;
874
875 /*
876 * We could add a second check for a QFS Unix capability bit
877 */
878 if ((tcon->ses->capabilities & CAP_UNIX) &&
879 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
880 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
881
882 /*
883 * Only need to call the old QFSInfo if failed on newer one,
884 * e.g. by OS/2.
885 **/
886 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
887 rc = CIFSSMBQFSInfo(xid, tcon, buf);
888
889 /*
890 * Some old Windows servers also do not support level 103, retry with
891 * older level one if old server failed the previous call or we
892 * bypassed it because we detected that this was an older LANMAN sess
893 */
894 if (rc)
895 rc = SMBOldQFSInfo(xid, tcon, buf);
896 return rc;
897}
898
Pavel Shilovskyd39a4f72012-09-19 06:22:43 -0700899static int
900cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
901 __u64 length, __u32 type, int lock, int unlock, bool wait)
902{
903 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
904 current->tgid, length, offset, unlock, lock,
905 (__u8)type, wait, 0);
906}
907
Jeff Layton23db65f2012-05-15 12:20:51 -0400908struct smb_version_operations smb1_operations = {
Jeff Layton121b0462012-05-15 12:21:10 -0400909 .send_cancel = send_nt_cancel,
Pavel Shilovsky55157df2012-02-28 14:04:17 +0300910 .compare_fids = cifs_compare_fids,
Pavel Shilovsky082d0642012-05-17 12:18:21 +0400911 .setup_request = cifs_setup_request,
Pavel Shilovsky45740842012-06-01 14:26:18 +0400912 .setup_async_request = cifs_setup_async_request,
Pavel Shilovsky082d0642012-05-17 12:18:21 +0400913 .check_receive = cifs_check_receive,
Pavel Shilovsky45275782012-05-17 17:53:29 +0400914 .add_credits = cifs_add_credits,
915 .set_credits = cifs_set_credits,
916 .get_credits_field = cifs_get_credits_field,
Pavel Shilovskya891f0f2012-05-23 16:14:34 +0400917 .get_credits = cifs_get_credits,
Pavel Shilovsky88257362012-05-23 14:01:59 +0400918 .get_next_mid = cifs_get_next_mid,
Pavel Shilovskyeb378712012-05-17 13:02:51 +0400919 .read_data_offset = cifs_read_data_offset,
920 .read_data_length = cifs_read_data_length,
921 .map_error = map_smb_to_linux_error,
Pavel Shilovsky8aa26f32012-05-17 13:25:35 +0400922 .find_mid = cifs_find_mid,
923 .check_message = checkSMB,
924 .dump_detail = cifs_dump_detail,
Pavel Shilovsky44c58182012-05-28 14:16:31 +0400925 .clear_stats = cifs_clear_stats,
926 .print_stats = cifs_print_stats,
Pavel Shilovsky8aa26f32012-05-17 13:25:35 +0400927 .is_oplock_break = is_valid_oplock_break,
Pavel Shilovsky316cf942012-05-23 14:31:03 +0400928 .check_trans2 = cifs_check_trans2,
Pavel Shilovsky286170a2012-05-25 10:43:58 +0400929 .need_neg = cifs_need_neg,
930 .negotiate = cifs_negotiate,
Pavel Shilovsky24985c52012-09-18 16:20:28 -0700931 .negotiate_wsize = cifs_negotiate_wsize,
932 .negotiate_rsize = cifs_negotiate_rsize,
Pavel Shilovsky58c45c52012-05-25 10:54:49 +0400933 .sess_setup = CIFS_SessSetup,
934 .logoff = CIFSSMBLogoff,
Pavel Shilovsky2e6e02a2012-05-25 11:11:39 +0400935 .tree_connect = CIFSTCon,
936 .tree_disconnect = CIFSSMBTDis,
Pavel Shilovskyb669f332012-05-27 20:21:53 +0400937 .get_dfs_refer = CIFSGetDFSRefer,
Pavel Shilovskyaf4281d2012-05-27 20:48:35 +0400938 .qfs_tcon = cifs_qfs_tcon,
Pavel Shilovsky68889f22012-05-25 14:40:22 +0400939 .is_path_accessible = cifs_is_path_accessible,
Pavel Shilovsky1208ef12012-05-27 17:34:43 +0400940 .query_path_info = cifs_query_path_info,
Pavel Shilovsky4ad65042012-09-18 16:20:26 -0700941 .query_file_info = cifs_query_file_info,
Pavel Shilovsky1208ef12012-05-27 17:34:43 +0400942 .get_srv_inum = cifs_get_srv_inum,
Pavel Shilovskyd1433412012-09-18 16:20:31 -0700943 .set_path_size = CIFSSMBSetEOF,
944 .set_file_size = CIFSSMBSetFileSize,
Pavel Shilovsky6bdf6db2012-09-18 16:20:32 -0700945 .set_file_info = smb_set_file_info,
Pavel Shilovsky9224dfc2012-05-27 20:39:52 +0400946 .build_path_to_root = cifs_build_path_to_root,
Pavel Shilovskyf6d76172012-05-25 14:47:16 +0400947 .echo = CIFSSMBEcho,
Pavel Shilovskyf4367202012-03-17 11:41:12 +0300948 .mkdir = CIFSSMBMkDir,
949 .mkdir_setinfo = cifs_mkdir_setinfo,
Pavel Shilovskyf958ca52012-07-10 16:14:18 +0400950 .rmdir = CIFSSMBRmDir,
Pavel Shilovskyed6875e2012-09-18 16:20:25 -0700951 .unlink = CIFSSMBDelFile,
952 .rename_pending_delete = cifs_rename_pending_delete,
Pavel Shilovsky8ceb9842012-09-18 16:20:30 -0700953 .rename = CIFSSMBRename,
Steve Frenchd6e906f2012-09-18 16:20:31 -0700954 .create_hardlink = CIFSCreateHardLink,
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700955 .open = cifs_open_file,
956 .set_fid = cifs_set_fid,
Pavel Shilovsky0ff78a22012-09-18 16:20:26 -0700957 .close = cifs_close_file,
Pavel Shilovsky1d8c4c02012-09-18 16:20:27 -0700958 .flush = cifs_flush_file,
Pavel Shilovskyfc9c5962012-09-18 16:20:28 -0700959 .async_readv = cifs_async_readv,
Pavel Shilovskyc9de5c82012-09-18 16:20:29 -0700960 .async_writev = cifs_async_writev,
Pavel Shilovskyf9c6e232012-09-18 16:20:29 -0700961 .sync_read = cifs_sync_read,
Pavel Shilovskyba9ad7252012-09-18 16:20:30 -0700962 .sync_write = cifs_sync_write,
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700963 .query_dir_first = cifs_query_dir_first,
964 .query_dir_next = cifs_query_dir_next,
965 .close_dir = cifs_close_dir,
966 .calc_smb_size = smbCalcSize,
Pavel Shilovsky95a3f2f2012-09-18 16:20:33 -0700967 .oplock_response = cifs_oplock_response,
Pavel Shilovsky76ec5e32012-09-18 16:20:33 -0700968 .queryfs = cifs_queryfs,
Pavel Shilovskyd39a4f72012-09-19 06:22:43 -0700969 .mand_lock = cifs_mand_lock,
970 .mand_unlock_range = cifs_unlock_range,
971 .push_mand_locks = cifs_push_mandatory_locks,
Jeff Layton23db65f2012-05-15 12:20:51 -0400972};
973
974struct smb_version_values smb1_values = {
975 .version_string = SMB1_VERSION_STRING,
Pavel Shilovsky106dc532012-02-28 14:23:34 +0300976 .large_lock_type = LOCKING_ANDX_LARGE_FILES,
977 .exclusive_lock_type = 0,
978 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
979 .unlock_lock_type = 0,
Pavel Shilovsky1887f602012-05-17 12:45:31 +0400980 .header_size = sizeof(struct smb_hdr),
981 .max_header_size = MAX_CIFS_HDR_SIZE,
Pavel Shilovskyeb378712012-05-17 13:02:51 +0400982 .read_rsp_size = sizeof(READ_RSP),
Pavel Shilovsky2dc7e1c2011-12-26 22:53:34 +0400983 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400984 .cap_unix = CAP_UNIX,
985 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
986 .cap_large_files = CAP_LARGE_FILES,
Jeff Layton23db65f2012-05-15 12:20:51 -0400987};