original development tree for Linux kernel GTP module; now long in mainline.
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  1. /*
  2. * fs/cifs/smb2misc.c
  3. *
  4. * Copyright (C) International Business Machines Corp., 2002,2011
  5. * Etersoft, 2012
  6. * Author(s): Steve French (sfrench@us.ibm.com)
  7. * Pavel Shilovsky (pshilovsky@samba.org) 2012
  8. *
  9. * This library is free software; you can redistribute it and/or modify
  10. * it under the terms of the GNU Lesser General Public License as published
  11. * by the Free Software Foundation; either version 2.1 of the License, or
  12. * (at your option) any later version.
  13. *
  14. * This library is distributed in the hope that it will be useful,
  15. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
  17. * the GNU Lesser General Public License for more details.
  18. *
  19. * You should have received a copy of the GNU Lesser General Public License
  20. * along with this library; if not, write to the Free Software
  21. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22. */
  23. #include <linux/ctype.h>
  24. #include "smb2pdu.h"
  25. #include "cifsglob.h"
  26. #include "cifsproto.h"
  27. #include "smb2proto.h"
  28. #include "cifs_debug.h"
  29. #include "cifs_unicode.h"
  30. #include "smb2status.h"
  31. static int
  32. check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid)
  33. {
  34. /*
  35. * Make sure that this really is an SMB, that it is a response,
  36. * and that the message ids match.
  37. */
  38. if ((*(__le32 *)hdr->ProtocolId == SMB2_PROTO_NUMBER) &&
  39. (mid == hdr->MessageId)) {
  40. if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
  41. return 0;
  42. else {
  43. /* only one valid case where server sends us request */
  44. if (hdr->Command == SMB2_OPLOCK_BREAK)
  45. return 0;
  46. else
  47. cifs_dbg(VFS, "Received Request not response\n");
  48. }
  49. } else { /* bad signature or mid */
  50. if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
  51. cifs_dbg(VFS, "Bad protocol string signature header %x\n",
  52. *(unsigned int *) hdr->ProtocolId);
  53. if (mid != hdr->MessageId)
  54. cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
  55. mid, hdr->MessageId);
  56. }
  57. cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", hdr->MessageId);
  58. return 1;
  59. }
  60. /*
  61. * The following table defines the expected "StructureSize" of SMB2 responses
  62. * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
  63. *
  64. * Note that commands are defined in smb2pdu.h in le16 but the array below is
  65. * indexed by command in host byte order
  66. */
  67. static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  68. /* SMB2_NEGOTIATE */ __constant_cpu_to_le16(65),
  69. /* SMB2_SESSION_SETUP */ __constant_cpu_to_le16(9),
  70. /* SMB2_LOGOFF */ __constant_cpu_to_le16(4),
  71. /* SMB2_TREE_CONNECT */ __constant_cpu_to_le16(16),
  72. /* SMB2_TREE_DISCONNECT */ __constant_cpu_to_le16(4),
  73. /* SMB2_CREATE */ __constant_cpu_to_le16(89),
  74. /* SMB2_CLOSE */ __constant_cpu_to_le16(60),
  75. /* SMB2_FLUSH */ __constant_cpu_to_le16(4),
  76. /* SMB2_READ */ __constant_cpu_to_le16(17),
  77. /* SMB2_WRITE */ __constant_cpu_to_le16(17),
  78. /* SMB2_LOCK */ __constant_cpu_to_le16(4),
  79. /* SMB2_IOCTL */ __constant_cpu_to_le16(49),
  80. /* BB CHECK this ... not listed in documentation */
  81. /* SMB2_CANCEL */ __constant_cpu_to_le16(0),
  82. /* SMB2_ECHO */ __constant_cpu_to_le16(4),
  83. /* SMB2_QUERY_DIRECTORY */ __constant_cpu_to_le16(9),
  84. /* SMB2_CHANGE_NOTIFY */ __constant_cpu_to_le16(9),
  85. /* SMB2_QUERY_INFO */ __constant_cpu_to_le16(9),
  86. /* SMB2_SET_INFO */ __constant_cpu_to_le16(2),
  87. /* BB FIXME can also be 44 for lease break */
  88. /* SMB2_OPLOCK_BREAK */ __constant_cpu_to_le16(24)
  89. };
  90. int
  91. smb2_check_message(char *buf, unsigned int length)
  92. {
  93. struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
  94. struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  95. __u64 mid = hdr->MessageId;
  96. __u32 len = get_rfc1002_length(buf);
  97. __u32 clc_len; /* calculated length */
  98. int command;
  99. /* BB disable following printk later */
  100. cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
  101. __func__, length, len);
  102. /*
  103. * Add function to do table lookup of StructureSize by command
  104. * ie Validate the wct via smb2_struct_sizes table above
  105. */
  106. if (length < sizeof(struct smb2_pdu)) {
  107. if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
  108. pdu->StructureSize2 = 0;
  109. /*
  110. * As with SMB/CIFS, on some error cases servers may
  111. * not return wct properly
  112. */
  113. return 0;
  114. } else {
  115. cifs_dbg(VFS, "Length less than SMB header size\n");
  116. }
  117. return 1;
  118. }
  119. if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
  120. cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
  121. mid);
  122. return 1;
  123. }
  124. if (check_smb2_hdr(hdr, mid))
  125. return 1;
  126. if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
  127. cifs_dbg(VFS, "Illegal structure size %u\n",
  128. le16_to_cpu(hdr->StructureSize));
  129. return 1;
  130. }
  131. command = le16_to_cpu(hdr->Command);
  132. if (command >= NUMBER_OF_SMB2_COMMANDS) {
  133. cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
  134. return 1;
  135. }
  136. if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
  137. if (command != SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0 ||
  138. pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
  139. /* error packets have 9 byte structure size */
  140. cifs_dbg(VFS, "Illegal response size %u for command %d\n",
  141. le16_to_cpu(pdu->StructureSize2), command);
  142. return 1;
  143. } else if (command == SMB2_OPLOCK_BREAK_HE && (hdr->Status == 0)
  144. && (le16_to_cpu(pdu->StructureSize2) != 44)
  145. && (le16_to_cpu(pdu->StructureSize2) != 36)) {
  146. /* special case for SMB2.1 lease break message */
  147. cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
  148. le16_to_cpu(pdu->StructureSize2));
  149. return 1;
  150. }
  151. }
  152. if (4 + len != length) {
  153. cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
  154. length, 4 + len, mid);
  155. return 1;
  156. }
  157. clc_len = smb2_calc_size(hdr);
  158. if (4 + len != clc_len) {
  159. cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
  160. clc_len, 4 + len, mid);
  161. /* create failed on symlink */
  162. if (command == SMB2_CREATE_HE &&
  163. hdr->Status == STATUS_STOPPED_ON_SYMLINK)
  164. return 0;
  165. /* Windows 7 server returns 24 bytes more */
  166. if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
  167. return 0;
  168. /* server can return one byte more */
  169. if (clc_len == 4 + len + 1)
  170. return 0;
  171. return 1;
  172. }
  173. return 0;
  174. }
  175. /*
  176. * The size of the variable area depends on the offset and length fields
  177. * located in different fields for various SMB2 responses. SMB2 responses
  178. * with no variable length info, show an offset of zero for the offset field.
  179. */
  180. static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
  181. /* SMB2_NEGOTIATE */ true,
  182. /* SMB2_SESSION_SETUP */ true,
  183. /* SMB2_LOGOFF */ false,
  184. /* SMB2_TREE_CONNECT */ false,
  185. /* SMB2_TREE_DISCONNECT */ false,
  186. /* SMB2_CREATE */ true,
  187. /* SMB2_CLOSE */ false,
  188. /* SMB2_FLUSH */ false,
  189. /* SMB2_READ */ true,
  190. /* SMB2_WRITE */ false,
  191. /* SMB2_LOCK */ false,
  192. /* SMB2_IOCTL */ true,
  193. /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
  194. /* SMB2_ECHO */ false,
  195. /* SMB2_QUERY_DIRECTORY */ true,
  196. /* SMB2_CHANGE_NOTIFY */ true,
  197. /* SMB2_QUERY_INFO */ true,
  198. /* SMB2_SET_INFO */ false,
  199. /* SMB2_OPLOCK_BREAK */ false
  200. };
  201. /*
  202. * Returns the pointer to the beginning of the data area. Length of the data
  203. * area and the offset to it (from the beginning of the smb are also returned.
  204. */
  205. char *
  206. smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
  207. {
  208. *off = 0;
  209. *len = 0;
  210. /* error responses do not have data area */
  211. if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
  212. (((struct smb2_err_rsp *)hdr)->StructureSize) ==
  213. SMB2_ERROR_STRUCTURE_SIZE2)
  214. return NULL;
  215. /*
  216. * Following commands have data areas so we have to get the location
  217. * of the data buffer offset and data buffer length for the particular
  218. * command.
  219. */
  220. switch (hdr->Command) {
  221. case SMB2_NEGOTIATE:
  222. *off = le16_to_cpu(
  223. ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
  224. *len = le16_to_cpu(
  225. ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
  226. break;
  227. case SMB2_SESSION_SETUP:
  228. *off = le16_to_cpu(
  229. ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
  230. *len = le16_to_cpu(
  231. ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
  232. break;
  233. case SMB2_CREATE:
  234. *off = le32_to_cpu(
  235. ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
  236. *len = le32_to_cpu(
  237. ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
  238. break;
  239. case SMB2_QUERY_INFO:
  240. *off = le16_to_cpu(
  241. ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
  242. *len = le32_to_cpu(
  243. ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
  244. break;
  245. case SMB2_READ:
  246. *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
  247. *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
  248. break;
  249. case SMB2_QUERY_DIRECTORY:
  250. *off = le16_to_cpu(
  251. ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
  252. *len = le32_to_cpu(
  253. ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
  254. break;
  255. case SMB2_IOCTL:
  256. *off = le32_to_cpu(
  257. ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
  258. *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
  259. break;
  260. case SMB2_CHANGE_NOTIFY:
  261. default:
  262. /* BB FIXME for unimplemented cases above */
  263. cifs_dbg(VFS, "no length check for command\n");
  264. break;
  265. }
  266. /*
  267. * Invalid length or offset probably means data area is invalid, but
  268. * we have little choice but to ignore the data area in this case.
  269. */
  270. if (*off > 4096) {
  271. cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
  272. *len = 0;
  273. *off = 0;
  274. } else if (*off < 0) {
  275. cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
  276. *off);
  277. *off = 0;
  278. *len = 0;
  279. } else if (*len < 0) {
  280. cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
  281. *len);
  282. *len = 0;
  283. } else if (*len > 128 * 1024) {
  284. cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
  285. *len = 0;
  286. }
  287. /* return pointer to beginning of data area, ie offset from SMB start */
  288. if ((*off != 0) && (*len != 0))
  289. return hdr->ProtocolId + *off;
  290. else
  291. return NULL;
  292. }
  293. /*
  294. * Calculate the size of the SMB message based on the fixed header
  295. * portion, the number of word parameters and the data portion of the message.
  296. */
  297. unsigned int
  298. smb2_calc_size(void *buf)
  299. {
  300. struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
  301. struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  302. int offset; /* the offset from the beginning of SMB to data area */
  303. int data_length; /* the length of the variable length data area */
  304. /* Structure Size has already been checked to make sure it is 64 */
  305. int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
  306. /*
  307. * StructureSize2, ie length of fixed parameter area has already
  308. * been checked to make sure it is the correct length.
  309. */
  310. len += le16_to_cpu(pdu->StructureSize2);
  311. if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
  312. goto calc_size_exit;
  313. smb2_get_data_area_len(&offset, &data_length, hdr);
  314. cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
  315. if (data_length > 0) {
  316. /*
  317. * Check to make sure that data area begins after fixed area,
  318. * Note that last byte of the fixed area is part of data area
  319. * for some commands, typically those with odd StructureSize,
  320. * so we must add one to the calculation (and 4 to account for
  321. * the size of the RFC1001 hdr.
  322. */
  323. if (offset + 4 + 1 < len) {
  324. cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
  325. offset + 4 + 1, len);
  326. data_length = 0;
  327. } else {
  328. len = 4 + offset + data_length;
  329. }
  330. }
  331. calc_size_exit:
  332. cifs_dbg(FYI, "SMB2 len %d\n", len);
  333. return len;
  334. }
  335. /* Note: caller must free return buffer */
  336. __le16 *
  337. cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
  338. {
  339. int len;
  340. const char *start_of_path;
  341. __le16 *to;
  342. /* Windows doesn't allow paths beginning with \ */
  343. if (from[0] == '\\')
  344. start_of_path = from + 1;
  345. else
  346. start_of_path = from;
  347. to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
  348. cifs_sb->local_nls,
  349. cifs_sb->mnt_cifs_flags &
  350. CIFS_MOUNT_MAP_SPECIAL_CHR);
  351. return to;
  352. }
  353. __le32
  354. smb2_get_lease_state(struct cifsInodeInfo *cinode)
  355. {
  356. __le32 lease = 0;
  357. if (CIFS_CACHE_WRITE(cinode))
  358. lease |= SMB2_LEASE_WRITE_CACHING;
  359. if (CIFS_CACHE_HANDLE(cinode))
  360. lease |= SMB2_LEASE_HANDLE_CACHING;
  361. if (CIFS_CACHE_READ(cinode))
  362. lease |= SMB2_LEASE_READ_CACHING;
  363. return lease;
  364. }
  365. struct smb2_lease_break_work {
  366. struct work_struct lease_break;
  367. struct tcon_link *tlink;
  368. __u8 lease_key[16];
  369. __le32 lease_state;
  370. };
  371. static void
  372. cifs_ses_oplock_break(struct work_struct *work)
  373. {
  374. struct smb2_lease_break_work *lw = container_of(work,
  375. struct smb2_lease_break_work, lease_break);
  376. int rc;
  377. rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
  378. lw->lease_state);
  379. cifs_dbg(FYI, "Lease release rc %d\n", rc);
  380. cifs_put_tlink(lw->tlink);
  381. kfree(lw);
  382. }
  383. static bool
  384. smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
  385. struct smb2_lease_break_work *lw)
  386. {
  387. bool found;
  388. __u8 lease_state;
  389. struct list_head *tmp;
  390. struct cifsFileInfo *cfile;
  391. struct TCP_Server_Info *server = tcon->ses->server;
  392. struct cifs_pending_open *open;
  393. struct cifsInodeInfo *cinode;
  394. int ack_req = le32_to_cpu(rsp->Flags &
  395. SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
  396. lease_state = le32_to_cpu(rsp->NewLeaseState);
  397. list_for_each(tmp, &tcon->openFileList) {
  398. cfile = list_entry(tmp, struct cifsFileInfo, tlist);
  399. cinode = CIFS_I(cfile->dentry->d_inode);
  400. if (memcmp(cinode->lease_key, rsp->LeaseKey,
  401. SMB2_LEASE_KEY_SIZE))
  402. continue;
  403. cifs_dbg(FYI, "found in the open list\n");
  404. cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
  405. le32_to_cpu(rsp->NewLeaseState));
  406. server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
  407. if (ack_req)
  408. cfile->oplock_break_cancelled = false;
  409. else
  410. cfile->oplock_break_cancelled = true;
  411. queue_work(cifsiod_wq, &cfile->oplock_break);
  412. kfree(lw);
  413. return true;
  414. }
  415. found = false;
  416. list_for_each_entry(open, &tcon->pending_opens, olist) {
  417. if (memcmp(open->lease_key, rsp->LeaseKey,
  418. SMB2_LEASE_KEY_SIZE))
  419. continue;
  420. if (!found && ack_req) {
  421. found = true;
  422. memcpy(lw->lease_key, open->lease_key,
  423. SMB2_LEASE_KEY_SIZE);
  424. lw->tlink = cifs_get_tlink(open->tlink);
  425. queue_work(cifsiod_wq, &lw->lease_break);
  426. }
  427. cifs_dbg(FYI, "found in the pending open list\n");
  428. cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
  429. le32_to_cpu(rsp->NewLeaseState));
  430. open->oplock = lease_state;
  431. }
  432. return found;
  433. }
  434. static bool
  435. smb2_is_valid_lease_break(char *buffer)
  436. {
  437. struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
  438. struct list_head *tmp, *tmp1, *tmp2;
  439. struct TCP_Server_Info *server;
  440. struct cifs_ses *ses;
  441. struct cifs_tcon *tcon;
  442. struct smb2_lease_break_work *lw;
  443. lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
  444. if (!lw)
  445. return false;
  446. INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
  447. lw->lease_state = rsp->NewLeaseState;
  448. cifs_dbg(FYI, "Checking for lease break\n");
  449. /* look up tcon based on tid & uid */
  450. spin_lock(&cifs_tcp_ses_lock);
  451. list_for_each(tmp, &cifs_tcp_ses_list) {
  452. server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
  453. list_for_each(tmp1, &server->smb_ses_list) {
  454. ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
  455. spin_lock(&cifs_file_list_lock);
  456. list_for_each(tmp2, &ses->tcon_list) {
  457. tcon = list_entry(tmp2, struct cifs_tcon,
  458. tcon_list);
  459. cifs_stats_inc(
  460. &tcon->stats.cifs_stats.num_oplock_brks);
  461. if (smb2_tcon_has_lease(tcon, rsp, lw)) {
  462. spin_unlock(&cifs_file_list_lock);
  463. spin_unlock(&cifs_tcp_ses_lock);
  464. return true;
  465. }
  466. }
  467. spin_unlock(&cifs_file_list_lock);
  468. }
  469. }
  470. spin_unlock(&cifs_tcp_ses_lock);
  471. kfree(lw);
  472. cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
  473. return false;
  474. }
  475. bool
  476. smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
  477. {
  478. struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
  479. struct list_head *tmp, *tmp1, *tmp2;
  480. struct cifs_ses *ses;
  481. struct cifs_tcon *tcon;
  482. struct cifsInodeInfo *cinode;
  483. struct cifsFileInfo *cfile;
  484. cifs_dbg(FYI, "Checking for oplock break\n");
  485. if (rsp->hdr.Command != SMB2_OPLOCK_BREAK)
  486. return false;
  487. if (rsp->StructureSize !=
  488. smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
  489. if (le16_to_cpu(rsp->StructureSize) == 44)
  490. return smb2_is_valid_lease_break(buffer);
  491. else
  492. return false;
  493. }
  494. cifs_dbg(FYI, "oplock level 0x%d\n", rsp->OplockLevel);
  495. /* look up tcon based on tid & uid */
  496. spin_lock(&cifs_tcp_ses_lock);
  497. list_for_each(tmp, &server->smb_ses_list) {
  498. ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
  499. list_for_each(tmp1, &ses->tcon_list) {
  500. tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
  501. cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
  502. spin_lock(&cifs_file_list_lock);
  503. list_for_each(tmp2, &tcon->openFileList) {
  504. cfile = list_entry(tmp2, struct cifsFileInfo,
  505. tlist);
  506. if (rsp->PersistentFid !=
  507. cfile->fid.persistent_fid ||
  508. rsp->VolatileFid !=
  509. cfile->fid.volatile_fid)
  510. continue;
  511. cifs_dbg(FYI, "file id match, oplock break\n");
  512. cinode = CIFS_I(cfile->dentry->d_inode);
  513. if (!CIFS_CACHE_WRITE(cinode) &&
  514. rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
  515. cfile->oplock_break_cancelled = true;
  516. else
  517. cfile->oplock_break_cancelled = false;
  518. server->ops->set_oplock_level(cinode,
  519. rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0,
  520. 0, NULL);
  521. queue_work(cifsiod_wq, &cfile->oplock_break);
  522. spin_unlock(&cifs_file_list_lock);
  523. spin_unlock(&cifs_tcp_ses_lock);
  524. return true;
  525. }
  526. spin_unlock(&cifs_file_list_lock);
  527. spin_unlock(&cifs_tcp_ses_lock);
  528. cifs_dbg(FYI, "No matching file for oplock break\n");
  529. return true;
  530. }
  531. }
  532. spin_unlock(&cifs_tcp_ses_lock);
  533. cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
  534. return false;
  535. }