?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / fs / cifs / misc.c
blobb578c6d0959759d3a5a25d7a8f92d266d5d77fc1
1 /*
2 * fs/cifs/misc.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include <linux/slab.h>
23 #include <linux/ctype.h>
24 #include <linux/mempool.h>
25 #include "cifspdu.h"
26 #include "cifsglob.h"
27 #include "cifsproto.h"
28 #include "cifs_debug.h"
29 #include "smberr.h"
30 #include "nterr.h"
31 #include "cifs_unicode.h"
32 #ifdef CONFIG_CIFS_SMB2
33 #include "smb2pdu.h"
34 #endif
35
36 extern mempool_t *cifs_sm_req_poolp;
37 extern mempool_t *cifs_req_poolp;
38
39 /* The xid serves as a useful identifier for each incoming vfs request,
40 in a similar way to the mid which is useful to track each sent smb,
41 and CurrentXid can also provide a running counter (although it
42 will eventually wrap past zero) of the total vfs operations handled
43 since the cifs fs was mounted */
44
45 unsigned int
46 _get_xid(void)
47 {
48 unsigned int xid;
49
50 spin_lock(&GlobalMid_Lock);
51 GlobalTotalActiveXid++;
52
53 /* keep high water mark for number of simultaneous ops in filesystem */
54 if (GlobalTotalActiveXid > GlobalMaxActiveXid)
55 GlobalMaxActiveXid = GlobalTotalActiveXid;
56 if (GlobalTotalActiveXid > 65000)
57 cifs_dbg(FYI, "warning: more than 65000 requests active\n");
58 xid = GlobalCurrentXid++;
59 spin_unlock(&GlobalMid_Lock);
60 return xid;
61 }
62
63 void
64 _free_xid(unsigned int xid)
65 {
66 spin_lock(&GlobalMid_Lock);
67 /* if (GlobalTotalActiveXid == 0)
68 BUG(); */
69 GlobalTotalActiveXid--;
70 spin_unlock(&GlobalMid_Lock);
71 }
72
73 struct cifs_ses *
74 sesInfoAlloc(void)
75 {
76 struct cifs_ses *ret_buf;
77
78 ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
79 if (ret_buf) {
80 atomic_inc(&sesInfoAllocCount);
81 ret_buf->status = CifsNew;
82 ++ret_buf->ses_count;
83 INIT_LIST_HEAD(&ret_buf->smb_ses_list);
84 INIT_LIST_HEAD(&ret_buf->tcon_list);
85 mutex_init(&ret_buf->session_mutex);
86 }
87 return ret_buf;
88 }
89
90 void
91 sesInfoFree(struct cifs_ses *buf_to_free)
92 {
93 if (buf_to_free == NULL) {
94 cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n");
95 return;
96 }
97
98 atomic_dec(&sesInfoAllocCount);
99 kfree(buf_to_free->serverOS);
100 kfree(buf_to_free->serverDomain);
101 kfree(buf_to_free->serverNOS);
102 if (buf_to_free->password) {
103 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
104 kfree(buf_to_free->password);
105 }
106 kfree(buf_to_free->user_name);
107 kfree(buf_to_free->domainName);
108 kfree(buf_to_free->auth_key.response);
109 kfree(buf_to_free);
110 }
111
112 struct cifs_tcon *
113 tconInfoAlloc(void)
114 {
115 struct cifs_tcon *ret_buf;
116 ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
117 if (ret_buf) {
118 atomic_inc(&tconInfoAllocCount);
119 ret_buf->tidStatus = CifsNew;
120 ++ret_buf->tc_count;
121 INIT_LIST_HEAD(&ret_buf->openFileList);
122 INIT_LIST_HEAD(&ret_buf->tcon_list);
123 spin_lock_init(&ret_buf->open_file_lock);
124 #ifdef CONFIG_CIFS_STATS
125 spin_lock_init(&ret_buf->stat_lock);
126 #endif
127 }
128 return ret_buf;
129 }
130
131 void
132 tconInfoFree(struct cifs_tcon *buf_to_free)
133 {
134 if (buf_to_free == NULL) {
135 cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
136 return;
137 }
138 atomic_dec(&tconInfoAllocCount);
139 kfree(buf_to_free->nativeFileSystem);
140 if (buf_to_free->password) {
141 memset(buf_to_free->password, 0, strlen(buf_to_free->password));
142 kfree(buf_to_free->password);
143 }
144 kfree(buf_to_free);
145 }
146
147 struct smb_hdr *
148 cifs_buf_get(void)
149 {
150 struct smb_hdr *ret_buf = NULL;
151 size_t buf_size = sizeof(struct smb_hdr);
152
153 #ifdef CONFIG_CIFS_SMB2
154 /*
155 * SMB2 header is bigger than CIFS one - no problems to clean some
156 * more bytes for CIFS.
157 */
158 buf_size = sizeof(struct smb2_hdr);
159 #endif
160 /*
161 * We could use negotiated size instead of max_msgsize -
162 * but it may be more efficient to always alloc same size
163 * albeit slightly larger than necessary and maxbuffersize
164 * defaults to this and can not be bigger.
165 */
166 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
167
168 /* clear the first few header bytes */
169 /* for most paths, more is cleared in header_assemble */
170 if (ret_buf) {
171 memset(ret_buf, 0, buf_size + 3);
172 atomic_inc(&bufAllocCount);
173 #ifdef CONFIG_CIFS_STATS2
174 atomic_inc(&totBufAllocCount);
175 #endif /* CONFIG_CIFS_STATS2 */
176 }
177
178 return ret_buf;
179 }
180
181 void
182 cifs_buf_release(void *buf_to_free)
183 {
184 if (buf_to_free == NULL) {
185 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
186 return;
187 }
188 mempool_free(buf_to_free, cifs_req_poolp);
189
190 atomic_dec(&bufAllocCount);
191 return;
192 }
193
194 struct smb_hdr *
195 cifs_small_buf_get(void)
196 {
197 struct smb_hdr *ret_buf = NULL;
198
199 /* We could use negotiated size instead of max_msgsize -
200 but it may be more efficient to always alloc same size
201 albeit slightly larger than necessary and maxbuffersize
202 defaults to this and can not be bigger */
203 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
204 if (ret_buf) {
205 /* No need to clear memory here, cleared in header assemble */
206 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
207 atomic_inc(&smBufAllocCount);
208 #ifdef CONFIG_CIFS_STATS2
209 atomic_inc(&totSmBufAllocCount);
210 #endif /* CONFIG_CIFS_STATS2 */
211
212 }
213 return ret_buf;
214 }
215
216 void
217 cifs_small_buf_release(void *buf_to_free)
218 {
219
220 if (buf_to_free == NULL) {
221 cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
222 return;
223 }
224 mempool_free(buf_to_free, cifs_sm_req_poolp);
225
226 atomic_dec(&smBufAllocCount);
227 return;
228 }
229
230 void
231 free_rsp_buf(int resp_buftype, void *rsp)
232 {
233 if (resp_buftype == CIFS_SMALL_BUFFER)
234 cifs_small_buf_release(rsp);
235 else if (resp_buftype == CIFS_LARGE_BUFFER)
236 cifs_buf_release(rsp);
237 }
238
239 /* NB: MID can not be set if treeCon not passed in, in that
240 case it is responsbility of caller to set the mid */
241 void
242 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
243 const struct cifs_tcon *treeCon, int word_count
244 /* length of fixed section (word count) in two byte units */)
245 {
246 char *temp = (char *) buffer;
247
248 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
249
250 buffer->smb_buf_length = cpu_to_be32(
251 (2 * word_count) + sizeof(struct smb_hdr) -
252 4 /* RFC 1001 length field does not count */ +
253 2 /* for bcc field itself */) ;
254
255 buffer->Protocol[0] = 0xFF;
256 buffer->Protocol[1] = 'S';
257 buffer->Protocol[2] = 'M';
258 buffer->Protocol[3] = 'B';
259 buffer->Command = smb_command;
260 buffer->Flags = 0x00; /* case sensitive */
261 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
262 buffer->Pid = cpu_to_le16((__u16)current->tgid);
263 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
264 if (treeCon) {
265 buffer->Tid = treeCon->tid;
266 if (treeCon->ses) {
267 if (treeCon->ses->capabilities & CAP_UNICODE)
268 buffer->Flags2 |= SMBFLG2_UNICODE;
269 if (treeCon->ses->capabilities & CAP_STATUS32)
270 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
271
272 /* Uid is not converted */
273 buffer->Uid = treeCon->ses->Suid;
274 buffer->Mid = get_next_mid(treeCon->ses->server);
275 }
276 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
277 buffer->Flags2 |= SMBFLG2_DFS;
278 if (treeCon->nocase)
279 buffer->Flags |= SMBFLG_CASELESS;
280 if ((treeCon->ses) && (treeCon->ses->server))
281 if (treeCon->ses->server->sign)
282 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
283 }
284
285 /* endian conversion of flags is now done just before sending */
286 buffer->WordCount = (char) word_count;
287 return;
288 }
289
290 static int
291 check_smb_hdr(struct smb_hdr *smb)
292 {
293 /* does it have the right SMB "signature" ? */
294 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
295 cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
296 *(unsigned int *)smb->Protocol);
297 return 1;
298 }
299
300 /* if it's a response then accept */
301 if (smb->Flags & SMBFLG_RESPONSE)
302 return 0;
303
304 /* only one valid case where server sends us request */
305 if (smb->Command == SMB_COM_LOCKING_ANDX)
306 return 0;
307
308 cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
309 get_mid(smb));
310 return 1;
311 }
312
313 int
314 checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
315 {
316 struct smb_hdr *smb = (struct smb_hdr *)buf;
317 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
318 __u32 clc_len; /* calculated length */
319 cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
320 total_read, rfclen);
321
322 /* is this frame too small to even get to a BCC? */
323 if (total_read < 2 + sizeof(struct smb_hdr)) {
324 if ((total_read >= sizeof(struct smb_hdr) - 1)
325 && (smb->Status.CifsError != 0)) {
326 /* it's an error return */
327 smb->WordCount = 0;
328 /* some error cases do not return wct and bcc */
329 return 0;
330 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
331 (smb->WordCount == 0)) {
332 char *tmp = (char *)smb;
333 /* Need to work around a bug in two servers here */
334 /* First, check if the part of bcc they sent was zero */
335 if (tmp[sizeof(struct smb_hdr)] == 0) {
336 /* some servers return only half of bcc
337 * on simple responses (wct, bcc both zero)
338 * in particular have seen this on
339 * ulogoffX and FindClose. This leaves
340 * one byte of bcc potentially unitialized
341 */
342 /* zero rest of bcc */
343 tmp[sizeof(struct smb_hdr)+1] = 0;
344 return 0;
345 }
346 cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
347 } else {
348 cifs_dbg(VFS, "Length less than smb header size\n");
349 }
350 return -EIO;
351 }
352
353 /* otherwise, there is enough to get to the BCC */
354 if (check_smb_hdr(smb))
355 return -EIO;
356 clc_len = smbCalcSize(smb);
357
358 if (4 + rfclen != total_read) {
359 cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
360 rfclen);
361 return -EIO;
362 }
363
364 if (4 + rfclen != clc_len) {
365 __u16 mid = get_mid(smb);
366 /* check if bcc wrapped around for large read responses */
367 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
368 /* check if lengths match mod 64K */
369 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
370 return 0; /* bcc wrapped */
371 }
372 cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
373 clc_len, 4 + rfclen, mid);
374
375 if (4 + rfclen < clc_len) {
376 cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
377 rfclen, mid);
378 return -EIO;
379 } else if (rfclen > clc_len + 512) {
380 /*
381 * Some servers (Windows XP in particular) send more
382 * data than the lengths in the SMB packet would
383 * indicate on certain calls (byte range locks and
384 * trans2 find first calls in particular). While the
385 * client can handle such a frame by ignoring the
386 * trailing data, we choose limit the amount of extra
387 * data to 512 bytes.
388 */
389 cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
390 rfclen, mid);
391 return -EIO;
392 }
393 }
394 return 0;
395 }
396
397 bool
398 is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
399 {
400 struct smb_hdr *buf = (struct smb_hdr *)buffer;
401 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
402 struct list_head *tmp, *tmp1, *tmp2;
403 struct cifs_ses *ses;
404 struct cifs_tcon *tcon;
405 struct cifsInodeInfo *pCifsInode;
406 struct cifsFileInfo *netfile;
407
408 cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
409 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
410 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
411 struct smb_com_transaction_change_notify_rsp *pSMBr =
412 (struct smb_com_transaction_change_notify_rsp *)buf;
413 struct file_notify_information *pnotify;
414 __u32 data_offset = 0;
415 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
416 data_offset = le32_to_cpu(pSMBr->DataOffset);
417
418 pnotify = (struct file_notify_information *)
419 ((char *)&pSMBr->hdr.Protocol + data_offset);
420 cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
421 pnotify->FileName, pnotify->Action);
422 /* cifs_dump_mem("Rcvd notify Data: ",buf,
423 sizeof(struct smb_hdr)+60); */
424 return true;
425 }
426 if (pSMBr->hdr.Status.CifsError) {
427 cifs_dbg(FYI, "notify err 0x%x\n",
428 pSMBr->hdr.Status.CifsError);
429 return true;
430 }
431 return false;
432 }
433 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
434 return false;
435 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
436 /* no sense logging error on invalid handle on oplock
437 break - harmless race between close request and oplock
438 break response is expected from time to time writing out
439 large dirty files cached on the client */
440 if ((NT_STATUS_INVALID_HANDLE) ==
441 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
442 cifs_dbg(FYI, "invalid handle on oplock break\n");
443 return true;
444 } else if (ERRbadfid ==
445 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
446 return true;
447 } else {
448 return false; /* on valid oplock brk we get "request" */
449 }
450 }
451 if (pSMB->hdr.WordCount != 8)
452 return false;
453
454 cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
455 pSMB->LockType, pSMB->OplockLevel);
456 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
457 return false;
458
459 /* look up tcon based on tid & uid */
460 spin_lock(&cifs_tcp_ses_lock);
461 list_for_each(tmp, &srv->smb_ses_list) {
462 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
463 list_for_each(tmp1, &ses->tcon_list) {
464 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
465 if (tcon->tid != buf->Tid)
466 continue;
467
468 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
469 spin_lock(&tcon->open_file_lock);
470 list_for_each(tmp2, &tcon->openFileList) {
471 netfile = list_entry(tmp2, struct cifsFileInfo,
472 tlist);
473 if (pSMB->Fid != netfile->fid.netfid)
474 continue;
475
476 cifs_dbg(FYI, "file id match, oplock break\n");
477 pCifsInode = CIFS_I(d_inode(netfile->dentry));
478
479 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
480 &pCifsInode->flags);
481
482 /*
483 * Set flag if the server downgrades the oplock
484 * to L2 else clear.
485 */
486 if (pSMB->OplockLevel)
487 set_bit(
488 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
489 &pCifsInode->flags);
490 else
491 clear_bit(
492 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
493 &pCifsInode->flags);
494
495 queue_work(cifsoplockd_wq,
496 &netfile->oplock_break);
497 netfile->oplock_break_cancelled = false;
498
499 spin_unlock(&tcon->open_file_lock);
500 spin_unlock(&cifs_tcp_ses_lock);
501 return true;
502 }
503 spin_unlock(&tcon->open_file_lock);
504 spin_unlock(&cifs_tcp_ses_lock);
505 cifs_dbg(FYI, "No matching file for oplock break\n");
506 return true;
507 }
508 }
509 spin_unlock(&cifs_tcp_ses_lock);
510 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
511 return true;
512 }
513
514 void
515 dump_smb(void *buf, int smb_buf_length)
516 {
517 if (traceSMB == 0)
518 return;
519
520 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
521 smb_buf_length, true);
522 }
523
524 void
525 cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
526 {
527 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
528 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
529 cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n",
530 cifs_sb_master_tcon(cifs_sb)->treeName);
531 }
532 }
533
534 void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
535 {
536 oplock &= 0xF;
537
538 if (oplock == OPLOCK_EXCLUSIVE) {
539 cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
540 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
541 &cinode->vfs_inode);
542 } else if (oplock == OPLOCK_READ) {
543 cinode->oplock = CIFS_CACHE_READ_FLG;
544 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
545 &cinode->vfs_inode);
546 } else
547 cinode->oplock = 0;
548 }
549
550 /*
551 * We wait for oplock breaks to be processed before we attempt to perform
552 * writes.
553 */
554 int cifs_get_writer(struct cifsInodeInfo *cinode)
555 {
556 int rc;
557
558 start:
559 rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
560 TASK_KILLABLE);
561 if (rc)
562 return rc;
563
564 spin_lock(&cinode->writers_lock);
565 if (!cinode->writers)
566 set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
567 cinode->writers++;
568 /* Check to see if we have started servicing an oplock break */
569 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
570 cinode->writers--;
571 if (cinode->writers == 0) {
572 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
573 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
574 }
575 spin_unlock(&cinode->writers_lock);
576 goto start;
577 }
578 spin_unlock(&cinode->writers_lock);
579 return 0;
580 }
581
582 void cifs_put_writer(struct cifsInodeInfo *cinode)
583 {
584 spin_lock(&cinode->writers_lock);
585 cinode->writers--;
586 if (cinode->writers == 0) {
587 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
588 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
589 }
590 spin_unlock(&cinode->writers_lock);
591 }
592
593 void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
594 {
595 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
596 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
597 }
598
599 bool
600 backup_cred(struct cifs_sb_info *cifs_sb)
601 {
602 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
603 if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid()))
604 return true;
605 }
606 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
607 if (in_group_p(cifs_sb->mnt_backupgid))
608 return true;
609 }
610
611 return false;
612 }
613
614 void
615 cifs_del_pending_open(struct cifs_pending_open *open)
616 {
617 spin_lock(&tlink_tcon(open->tlink)->open_file_lock);
618 list_del(&open->olist);
619 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
620 }
621
622 void
623 cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
624 struct cifs_pending_open *open)
625 {
626 #ifdef CONFIG_CIFS_SMB2
627 memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
628 #endif
629 open->oplock = CIFS_OPLOCK_NO_CHANGE;
630 open->tlink = tlink;
631 fid->pending_open = open;
632 list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
633 }
634
635 void
636 cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
637 struct cifs_pending_open *open)
638 {
639 spin_lock(&tlink_tcon(tlink)->open_file_lock);
640 cifs_add_pending_open_locked(fid, tlink, open);
641 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
642 }
643
644 /* parses DFS refferal V3 structure
645 * caller is responsible for freeing target_nodes
646 * returns:
647 * - on success - 0
648 * - on failure - errno
649 */
650 int
651 parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
652 unsigned int *num_of_nodes,
653 struct dfs_info3_param **target_nodes,
654 const struct nls_table *nls_codepage, int remap,
655 const char *searchName, bool is_unicode)
656 {
657 int i, rc = 0;
658 char *data_end;
659 struct dfs_referral_level_3 *ref;
660
661 *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals);
662
663 if (*num_of_nodes < 1) {
664 cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n",
665 *num_of_nodes);
666 rc = -EINVAL;
667 goto parse_DFS_referrals_exit;
668 }
669
670 ref = (struct dfs_referral_level_3 *) &(rsp->referrals);
671 if (ref->VersionNumber != cpu_to_le16(3)) {
672 cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
673 le16_to_cpu(ref->VersionNumber));
674 rc = -EINVAL;
675 goto parse_DFS_referrals_exit;
676 }
677
678 /* get the upper boundary of the resp buffer */
679 data_end = (char *)rsp + rsp_size;
680
681 cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
682 *num_of_nodes, le32_to_cpu(rsp->DFSFlags));
683
684 *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
685 GFP_KERNEL);
686 if (*target_nodes == NULL) {
687 rc = -ENOMEM;
688 goto parse_DFS_referrals_exit;
689 }
690
691 /* collect necessary data from referrals */
692 for (i = 0; i < *num_of_nodes; i++) {
693 char *temp;
694 int max_len;
695 struct dfs_info3_param *node = (*target_nodes)+i;
696
697 node->flags = le32_to_cpu(rsp->DFSFlags);
698 if (is_unicode) {
699 __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
700 GFP_KERNEL);
701 if (tmp == NULL) {
702 rc = -ENOMEM;
703 goto parse_DFS_referrals_exit;
704 }
705 cifsConvertToUTF16((__le16 *) tmp, searchName,
706 PATH_MAX, nls_codepage, remap);
707 node->path_consumed = cifs_utf16_bytes(tmp,
708 le16_to_cpu(rsp->PathConsumed),
709 nls_codepage);
710 kfree(tmp);
711 } else
712 node->path_consumed = le16_to_cpu(rsp->PathConsumed);
713
714 node->server_type = le16_to_cpu(ref->ServerType);
715 node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
716
717 /* copy DfsPath */
718 temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
719 max_len = data_end - temp;
720 node->path_name = cifs_strndup_from_utf16(temp, max_len,
721 is_unicode, nls_codepage);
722 if (!node->path_name) {
723 rc = -ENOMEM;
724 goto parse_DFS_referrals_exit;
725 }
726
727 /* copy link target UNC */
728 temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
729 max_len = data_end - temp;
730 node->node_name = cifs_strndup_from_utf16(temp, max_len,
731 is_unicode, nls_codepage);
732 if (!node->node_name) {
733 rc = -ENOMEM;
734 goto parse_DFS_referrals_exit;
735 }
736
737 ref++;
738 }
739
740 parse_DFS_referrals_exit:
741 if (rc) {
742 free_dfs_info_array(*target_nodes, *num_of_nodes);
743 *target_nodes = NULL;
744 *num_of_nodes = 0;
745 }
746 return rc;
747 }
Linux with added FPC-III support