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
_get_xid(void)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
_free_xid(unsigned int xid)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 *
sesInfoAlloc(void)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
sesInfoFree(struct cifs_ses * buf_to_free)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 kzfree(buf_to_free->password);
103 kfree(buf_to_free->user_name);
104 kfree(buf_to_free->domainName);
105 kzfree(buf_to_free->auth_key.response);
106 kzfree(buf_to_free);
107 }
108
109 struct cifs_tcon *
tconInfoAlloc(void)110 tconInfoAlloc(void)
111 {
112 struct cifs_tcon *ret_buf;
113 ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
114 if (ret_buf) {
115 atomic_inc(&tconInfoAllocCount);
116 ret_buf->tidStatus = CifsNew;
117 ++ret_buf->tc_count;
118 INIT_LIST_HEAD(&ret_buf->openFileList);
119 INIT_LIST_HEAD(&ret_buf->tcon_list);
120 spin_lock_init(&ret_buf->open_file_lock);
121 #ifdef CONFIG_CIFS_STATS
122 spin_lock_init(&ret_buf->stat_lock);
123 #endif
124 }
125 return ret_buf;
126 }
127
128 void
tconInfoFree(struct cifs_tcon * buf_to_free)129 tconInfoFree(struct cifs_tcon *buf_to_free)
130 {
131 if (buf_to_free == NULL) {
132 cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n");
133 return;
134 }
135 atomic_dec(&tconInfoAllocCount);
136 kfree(buf_to_free->nativeFileSystem);
137 kzfree(buf_to_free->password);
138 kfree(buf_to_free);
139 }
140
141 struct smb_hdr *
cifs_buf_get(void)142 cifs_buf_get(void)
143 {
144 struct smb_hdr *ret_buf = NULL;
145 size_t buf_size = sizeof(struct smb_hdr);
146
147 #ifdef CONFIG_CIFS_SMB2
148 /*
149 * SMB2 header is bigger than CIFS one - no problems to clean some
150 * more bytes for CIFS.
151 */
152 buf_size = sizeof(struct smb2_hdr);
153 #endif
154 /*
155 * We could use negotiated size instead of max_msgsize -
156 * but it may be more efficient to always alloc same size
157 * albeit slightly larger than necessary and maxbuffersize
158 * defaults to this and can not be bigger.
159 */
160 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
161
162 /* clear the first few header bytes */
163 /* for most paths, more is cleared in header_assemble */
164 if (ret_buf) {
165 memset(ret_buf, 0, buf_size + 3);
166 atomic_inc(&bufAllocCount);
167 #ifdef CONFIG_CIFS_STATS2
168 atomic_inc(&totBufAllocCount);
169 #endif /* CONFIG_CIFS_STATS2 */
170 }
171
172 return ret_buf;
173 }
174
175 void
cifs_buf_release(void * buf_to_free)176 cifs_buf_release(void *buf_to_free)
177 {
178 if (buf_to_free == NULL) {
179 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
180 return;
181 }
182 mempool_free(buf_to_free, cifs_req_poolp);
183
184 atomic_dec(&bufAllocCount);
185 return;
186 }
187
188 struct smb_hdr *
cifs_small_buf_get(void)189 cifs_small_buf_get(void)
190 {
191 struct smb_hdr *ret_buf = NULL;
192
193 /* We could use negotiated size instead of max_msgsize -
194 but it may be more efficient to always alloc same size
195 albeit slightly larger than necessary and maxbuffersize
196 defaults to this and can not be bigger */
197 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
198 if (ret_buf) {
199 /* No need to clear memory here, cleared in header assemble */
200 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
201 atomic_inc(&smBufAllocCount);
202 #ifdef CONFIG_CIFS_STATS2
203 atomic_inc(&totSmBufAllocCount);
204 #endif /* CONFIG_CIFS_STATS2 */
205
206 }
207 return ret_buf;
208 }
209
210 void
cifs_small_buf_release(void * buf_to_free)211 cifs_small_buf_release(void *buf_to_free)
212 {
213
214 if (buf_to_free == NULL) {
215 cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n");
216 return;
217 }
218 mempool_free(buf_to_free, cifs_sm_req_poolp);
219
220 atomic_dec(&smBufAllocCount);
221 return;
222 }
223
224 void
free_rsp_buf(int resp_buftype,void * rsp)225 free_rsp_buf(int resp_buftype, void *rsp)
226 {
227 if (resp_buftype == CIFS_SMALL_BUFFER)
228 cifs_small_buf_release(rsp);
229 else if (resp_buftype == CIFS_LARGE_BUFFER)
230 cifs_buf_release(rsp);
231 }
232
233 /* NB: MID can not be set if treeCon not passed in, in that
234 case it is responsbility of caller to set the mid */
235 void
header_assemble(struct smb_hdr * buffer,char smb_command,const struct cifs_tcon * treeCon,int word_count)236 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
237 const struct cifs_tcon *treeCon, int word_count
238 /* length of fixed section (word count) in two byte units */)
239 {
240 char *temp = (char *) buffer;
241
242 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
243
244 buffer->smb_buf_length = cpu_to_be32(
245 (2 * word_count) + sizeof(struct smb_hdr) -
246 4 /* RFC 1001 length field does not count */ +
247 2 /* for bcc field itself */) ;
248
249 buffer->Protocol[0] = 0xFF;
250 buffer->Protocol[1] = 'S';
251 buffer->Protocol[2] = 'M';
252 buffer->Protocol[3] = 'B';
253 buffer->Command = smb_command;
254 buffer->Flags = 0x00; /* case sensitive */
255 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
256 buffer->Pid = cpu_to_le16((__u16)current->tgid);
257 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
258 if (treeCon) {
259 buffer->Tid = treeCon->tid;
260 if (treeCon->ses) {
261 if (treeCon->ses->capabilities & CAP_UNICODE)
262 buffer->Flags2 |= SMBFLG2_UNICODE;
263 if (treeCon->ses->capabilities & CAP_STATUS32)
264 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
265
266 /* Uid is not converted */
267 buffer->Uid = treeCon->ses->Suid;
268 buffer->Mid = get_next_mid(treeCon->ses->server);
269 }
270 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
271 buffer->Flags2 |= SMBFLG2_DFS;
272 if (treeCon->nocase)
273 buffer->Flags |= SMBFLG_CASELESS;
274 if ((treeCon->ses) && (treeCon->ses->server))
275 if (treeCon->ses->server->sign)
276 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
277 }
278
279 /* endian conversion of flags is now done just before sending */
280 buffer->WordCount = (char) word_count;
281 return;
282 }
283
284 static int
check_smb_hdr(struct smb_hdr * smb)285 check_smb_hdr(struct smb_hdr *smb)
286 {
287 /* does it have the right SMB "signature" ? */
288 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
289 cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n",
290 *(unsigned int *)smb->Protocol);
291 return 1;
292 }
293
294 /* if it's a response then accept */
295 if (smb->Flags & SMBFLG_RESPONSE)
296 return 0;
297
298 /* only one valid case where server sends us request */
299 if (smb->Command == SMB_COM_LOCKING_ANDX)
300 return 0;
301
302 cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
303 get_mid(smb));
304 return 1;
305 }
306
307 int
checkSMB(char * buf,unsigned int total_read,struct TCP_Server_Info * server)308 checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
309 {
310 struct smb_hdr *smb = (struct smb_hdr *)buf;
311 __u32 rfclen = be32_to_cpu(smb->smb_buf_length);
312 __u32 clc_len; /* calculated length */
313 cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n",
314 total_read, rfclen);
315
316 /* is this frame too small to even get to a BCC? */
317 if (total_read < 2 + sizeof(struct smb_hdr)) {
318 if ((total_read >= sizeof(struct smb_hdr) - 1)
319 && (smb->Status.CifsError != 0)) {
320 /* it's an error return */
321 smb->WordCount = 0;
322 /* some error cases do not return wct and bcc */
323 return 0;
324 } else if ((total_read == sizeof(struct smb_hdr) + 1) &&
325 (smb->WordCount == 0)) {
326 char *tmp = (char *)smb;
327 /* Need to work around a bug in two servers here */
328 /* First, check if the part of bcc they sent was zero */
329 if (tmp[sizeof(struct smb_hdr)] == 0) {
330 /* some servers return only half of bcc
331 * on simple responses (wct, bcc both zero)
332 * in particular have seen this on
333 * ulogoffX and FindClose. This leaves
334 * one byte of bcc potentially unitialized
335 */
336 /* zero rest of bcc */
337 tmp[sizeof(struct smb_hdr)+1] = 0;
338 return 0;
339 }
340 cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n");
341 } else {
342 cifs_dbg(VFS, "Length less than smb header size\n");
343 }
344 return -EIO;
345 }
346
347 /* otherwise, there is enough to get to the BCC */
348 if (check_smb_hdr(smb))
349 return -EIO;
350 clc_len = smbCalcSize(smb);
351
352 if (4 + rfclen != total_read) {
353 cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
354 rfclen);
355 return -EIO;
356 }
357
358 if (4 + rfclen != clc_len) {
359 __u16 mid = get_mid(smb);
360 /* check if bcc wrapped around for large read responses */
361 if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
362 /* check if lengths match mod 64K */
363 if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
364 return 0; /* bcc wrapped */
365 }
366 cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
367 clc_len, 4 + rfclen, mid);
368
369 if (4 + rfclen < clc_len) {
370 cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
371 rfclen, mid);
372 return -EIO;
373 } else if (rfclen > clc_len + 512) {
374 /*
375 * Some servers (Windows XP in particular) send more
376 * data than the lengths in the SMB packet would
377 * indicate on certain calls (byte range locks and
378 * trans2 find first calls in particular). While the
379 * client can handle such a frame by ignoring the
380 * trailing data, we choose limit the amount of extra
381 * data to 512 bytes.
382 */
383 cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
384 rfclen, mid);
385 return -EIO;
386 }
387 }
388 return 0;
389 }
390
391 bool
is_valid_oplock_break(char * buffer,struct TCP_Server_Info * srv)392 is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
393 {
394 struct smb_hdr *buf = (struct smb_hdr *)buffer;
395 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
396 struct list_head *tmp, *tmp1, *tmp2;
397 struct cifs_ses *ses;
398 struct cifs_tcon *tcon;
399 struct cifsInodeInfo *pCifsInode;
400 struct cifsFileInfo *netfile;
401
402 cifs_dbg(FYI, "Checking for oplock break or dnotify response\n");
403 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
404 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
405 struct smb_com_transaction_change_notify_rsp *pSMBr =
406 (struct smb_com_transaction_change_notify_rsp *)buf;
407 struct file_notify_information *pnotify;
408 __u32 data_offset = 0;
409 if (get_bcc(buf) > sizeof(struct file_notify_information)) {
410 data_offset = le32_to_cpu(pSMBr->DataOffset);
411
412 pnotify = (struct file_notify_information *)
413 ((char *)&pSMBr->hdr.Protocol + data_offset);
414 cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n",
415 pnotify->FileName, pnotify->Action);
416 /* cifs_dump_mem("Rcvd notify Data: ",buf,
417 sizeof(struct smb_hdr)+60); */
418 return true;
419 }
420 if (pSMBr->hdr.Status.CifsError) {
421 cifs_dbg(FYI, "notify err 0x%x\n",
422 pSMBr->hdr.Status.CifsError);
423 return true;
424 }
425 return false;
426 }
427 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
428 return false;
429 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
430 /* no sense logging error on invalid handle on oplock
431 break - harmless race between close request and oplock
432 break response is expected from time to time writing out
433 large dirty files cached on the client */
434 if ((NT_STATUS_INVALID_HANDLE) ==
435 le32_to_cpu(pSMB->hdr.Status.CifsError)) {
436 cifs_dbg(FYI, "invalid handle on oplock break\n");
437 return true;
438 } else if (ERRbadfid ==
439 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
440 return true;
441 } else {
442 return false; /* on valid oplock brk we get "request" */
443 }
444 }
445 if (pSMB->hdr.WordCount != 8)
446 return false;
447
448 cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n",
449 pSMB->LockType, pSMB->OplockLevel);
450 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
451 return false;
452
453 /* look up tcon based on tid & uid */
454 spin_lock(&cifs_tcp_ses_lock);
455 list_for_each(tmp, &srv->smb_ses_list) {
456 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
457 list_for_each(tmp1, &ses->tcon_list) {
458 tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
459 if (tcon->tid != buf->Tid)
460 continue;
461
462 cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
463 spin_lock(&tcon->open_file_lock);
464 list_for_each(tmp2, &tcon->openFileList) {
465 netfile = list_entry(tmp2, struct cifsFileInfo,
466 tlist);
467 if (pSMB->Fid != netfile->fid.netfid)
468 continue;
469
470 cifs_dbg(FYI, "file id match, oplock break\n");
471 pCifsInode = CIFS_I(d_inode(netfile->dentry));
472
473 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
474 &pCifsInode->flags);
475
476 /*
477 * Set flag if the server downgrades the oplock
478 * to L2 else clear.
479 */
480 if (pSMB->OplockLevel)
481 set_bit(
482 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
483 &pCifsInode->flags);
484 else
485 clear_bit(
486 CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
487 &pCifsInode->flags);
488
489 queue_work(cifsoplockd_wq,
490 &netfile->oplock_break);
491 netfile->oplock_break_cancelled = false;
492
493 spin_unlock(&tcon->open_file_lock);
494 spin_unlock(&cifs_tcp_ses_lock);
495 return true;
496 }
497 spin_unlock(&tcon->open_file_lock);
498 spin_unlock(&cifs_tcp_ses_lock);
499 cifs_dbg(FYI, "No matching file for oplock break\n");
500 return true;
501 }
502 }
503 spin_unlock(&cifs_tcp_ses_lock);
504 cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
505 return true;
506 }
507
508 void
dump_smb(void * buf,int smb_buf_length)509 dump_smb(void *buf, int smb_buf_length)
510 {
511 if (traceSMB == 0)
512 return;
513
514 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf,
515 smb_buf_length, true);
516 }
517
518 void
cifs_autodisable_serverino(struct cifs_sb_info * cifs_sb)519 cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
520 {
521 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
522 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
523 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",
524 cifs_sb_master_tcon(cifs_sb)->treeName);
525 }
526 }
527
cifs_set_oplock_level(struct cifsInodeInfo * cinode,__u32 oplock)528 void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
529 {
530 oplock &= 0xF;
531
532 if (oplock == OPLOCK_EXCLUSIVE) {
533 cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG;
534 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
535 &cinode->vfs_inode);
536 } else if (oplock == OPLOCK_READ) {
537 cinode->oplock = CIFS_CACHE_READ_FLG;
538 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
539 &cinode->vfs_inode);
540 } else
541 cinode->oplock = 0;
542 }
543
544 /*
545 * We wait for oplock breaks to be processed before we attempt to perform
546 * writes.
547 */
cifs_get_writer(struct cifsInodeInfo * cinode)548 int cifs_get_writer(struct cifsInodeInfo *cinode)
549 {
550 int rc;
551
552 start:
553 rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK,
554 TASK_KILLABLE);
555 if (rc)
556 return rc;
557
558 spin_lock(&cinode->writers_lock);
559 if (!cinode->writers)
560 set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
561 cinode->writers++;
562 /* Check to see if we have started servicing an oplock break */
563 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) {
564 cinode->writers--;
565 if (cinode->writers == 0) {
566 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
567 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
568 }
569 spin_unlock(&cinode->writers_lock);
570 goto start;
571 }
572 spin_unlock(&cinode->writers_lock);
573 return 0;
574 }
575
cifs_put_writer(struct cifsInodeInfo * cinode)576 void cifs_put_writer(struct cifsInodeInfo *cinode)
577 {
578 spin_lock(&cinode->writers_lock);
579 cinode->writers--;
580 if (cinode->writers == 0) {
581 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags);
582 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS);
583 }
584 spin_unlock(&cinode->writers_lock);
585 }
586
cifs_done_oplock_break(struct cifsInodeInfo * cinode)587 void cifs_done_oplock_break(struct cifsInodeInfo *cinode)
588 {
589 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
590 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK);
591 }
592
593 bool
backup_cred(struct cifs_sb_info * cifs_sb)594 backup_cred(struct cifs_sb_info *cifs_sb)
595 {
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
597 if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid()))
598 return true;
599 }
600 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
601 if (in_group_p(cifs_sb->mnt_backupgid))
602 return true;
603 }
604
605 return false;
606 }
607
608 void
cifs_del_pending_open(struct cifs_pending_open * open)609 cifs_del_pending_open(struct cifs_pending_open *open)
610 {
611 spin_lock(&tlink_tcon(open->tlink)->open_file_lock);
612 list_del(&open->olist);
613 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
614 }
615
616 void
cifs_add_pending_open_locked(struct cifs_fid * fid,struct tcon_link * tlink,struct cifs_pending_open * open)617 cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink,
618 struct cifs_pending_open *open)
619 {
620 #ifdef CONFIG_CIFS_SMB2
621 memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
622 #endif
623 open->oplock = CIFS_OPLOCK_NO_CHANGE;
624 open->tlink = tlink;
625 fid->pending_open = open;
626 list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens);
627 }
628
629 void
cifs_add_pending_open(struct cifs_fid * fid,struct tcon_link * tlink,struct cifs_pending_open * open)630 cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
631 struct cifs_pending_open *open)
632 {
633 spin_lock(&tlink_tcon(tlink)->open_file_lock);
634 cifs_add_pending_open_locked(fid, tlink, open);
635 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
636 }
637