smb1ops.c 29 KB

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  1. /*
  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. #include <linux/pagemap.h>
  20. #include <linux/vfs.h>
  21. #include "cifsglob.h"
  22. #include "cifsproto.h"
  23. #include "cifs_debug.h"
  24. #include "cifspdu.h"
  25. /*
  26. * An NT cancel request header looks just like the original request except:
  27. *
  28. * The Command is SMB_COM_NT_CANCEL
  29. * The WordCount is zeroed out
  30. * The ByteCount is zeroed out
  31. *
  32. * This function mangles an existing request buffer into a
  33. * SMB_COM_NT_CANCEL request and then sends it.
  34. */
  35. static int
  36. send_nt_cancel(struct TCP_Server_Info *server, void *buf,
  37. struct mid_q_entry *mid)
  38. {
  39. int rc = 0;
  40. struct smb_hdr *in_buf = (struct smb_hdr *)buf;
  41. /* -4 for RFC1001 length and +2 for BCC field */
  42. in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
  43. in_buf->Command = SMB_COM_NT_CANCEL;
  44. in_buf->WordCount = 0;
  45. put_bcc(0, in_buf);
  46. mutex_lock(&server->srv_mutex);
  47. rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
  48. if (rc) {
  49. mutex_unlock(&server->srv_mutex);
  50. return rc;
  51. }
  52. /*
  53. * The response to this call was already factored into the sequence
  54. * number when the call went out, so we must adjust it back downward
  55. * after signing here.
  56. */
  57. --server->sequence_number;
  58. rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
  59. if (rc < 0)
  60. server->sequence_number--;
  61. mutex_unlock(&server->srv_mutex);
  62. cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
  63. in_buf->Mid, rc);
  64. return rc;
  65. }
  66. static bool
  67. cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
  68. {
  69. return ob1->fid.netfid == ob2->fid.netfid;
  70. }
  71. static unsigned int
  72. cifs_read_data_offset(char *buf)
  73. {
  74. READ_RSP *rsp = (READ_RSP *)buf;
  75. return le16_to_cpu(rsp->DataOffset);
  76. }
  77. static unsigned int
  78. cifs_read_data_length(char *buf)
  79. {
  80. READ_RSP *rsp = (READ_RSP *)buf;
  81. return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
  82. le16_to_cpu(rsp->DataLength);
  83. }
  84. static struct mid_q_entry *
  85. cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
  86. {
  87. struct smb_hdr *buf = (struct smb_hdr *)buffer;
  88. struct mid_q_entry *mid;
  89. spin_lock(&GlobalMid_Lock);
  90. list_for_each_entry(mid, &server->pending_mid_q, qhead) {
  91. if (mid->mid == buf->Mid &&
  92. mid->mid_state == MID_REQUEST_SUBMITTED &&
  93. le16_to_cpu(mid->command) == buf->Command) {
  94. spin_unlock(&GlobalMid_Lock);
  95. return mid;
  96. }
  97. }
  98. spin_unlock(&GlobalMid_Lock);
  99. return NULL;
  100. }
  101. static void
  102. cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
  103. const int optype)
  104. {
  105. spin_lock(&server->req_lock);
  106. server->credits += add;
  107. server->in_flight--;
  108. spin_unlock(&server->req_lock);
  109. wake_up(&server->request_q);
  110. }
  111. static void
  112. cifs_set_credits(struct TCP_Server_Info *server, const int val)
  113. {
  114. spin_lock(&server->req_lock);
  115. server->credits = val;
  116. server->oplocks = val > 1 ? enable_oplocks : false;
  117. spin_unlock(&server->req_lock);
  118. }
  119. static int *
  120. cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
  121. {
  122. return &server->credits;
  123. }
  124. static unsigned int
  125. cifs_get_credits(struct mid_q_entry *mid)
  126. {
  127. return 1;
  128. }
  129. /*
  130. * Find a free multiplex id (SMB mid). Otherwise there could be
  131. * mid collisions which might cause problems, demultiplexing the
  132. * wrong response to this request. Multiplex ids could collide if
  133. * one of a series requests takes much longer than the others, or
  134. * if a very large number of long lived requests (byte range
  135. * locks or FindNotify requests) are pending. No more than
  136. * 64K-1 requests can be outstanding at one time. If no
  137. * mids are available, return zero. A future optimization
  138. * could make the combination of mids and uid the key we use
  139. * to demultiplex on (rather than mid alone).
  140. * In addition to the above check, the cifs demultiplex
  141. * code already used the command code as a secondary
  142. * check of the frame and if signing is negotiated the
  143. * response would be discarded if the mid were the same
  144. * but the signature was wrong. Since the mid is not put in the
  145. * pending queue until later (when it is about to be dispatched)
  146. * we do have to limit the number of outstanding requests
  147. * to somewhat less than 64K-1 although it is hard to imagine
  148. * so many threads being in the vfs at one time.
  149. */
  150. static __u64
  151. cifs_get_next_mid(struct TCP_Server_Info *server)
  152. {
  153. __u64 mid = 0;
  154. __u16 last_mid, cur_mid;
  155. bool collision;
  156. spin_lock(&GlobalMid_Lock);
  157. /* mid is 16 bit only for CIFS/SMB */
  158. cur_mid = (__u16)((server->CurrentMid) & 0xffff);
  159. /* we do not want to loop forever */
  160. last_mid = cur_mid;
  161. cur_mid++;
  162. /*
  163. * This nested loop looks more expensive than it is.
  164. * In practice the list of pending requests is short,
  165. * fewer than 50, and the mids are likely to be unique
  166. * on the first pass through the loop unless some request
  167. * takes longer than the 64 thousand requests before it
  168. * (and it would also have to have been a request that
  169. * did not time out).
  170. */
  171. while (cur_mid != last_mid) {
  172. struct mid_q_entry *mid_entry;
  173. unsigned int num_mids;
  174. collision = false;
  175. if (cur_mid == 0)
  176. cur_mid++;
  177. num_mids = 0;
  178. list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
  179. ++num_mids;
  180. if (mid_entry->mid == cur_mid &&
  181. mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
  182. /* This mid is in use, try a different one */
  183. collision = true;
  184. break;
  185. }
  186. }
  187. /*
  188. * if we have more than 32k mids in the list, then something
  189. * is very wrong. Possibly a local user is trying to DoS the
  190. * box by issuing long-running calls and SIGKILL'ing them. If
  191. * we get to 2^16 mids then we're in big trouble as this
  192. * function could loop forever.
  193. *
  194. * Go ahead and assign out the mid in this situation, but force
  195. * an eventual reconnect to clean out the pending_mid_q.
  196. */
  197. if (num_mids > 32768)
  198. server->tcpStatus = CifsNeedReconnect;
  199. if (!collision) {
  200. mid = (__u64)cur_mid;
  201. server->CurrentMid = mid;
  202. break;
  203. }
  204. cur_mid++;
  205. }
  206. spin_unlock(&GlobalMid_Lock);
  207. return mid;
  208. }
  209. /*
  210. return codes:
  211. 0 not a transact2, or all data present
  212. >0 transact2 with that much data missing
  213. -EINVAL invalid transact2
  214. */
  215. static int
  216. check2ndT2(char *buf)
  217. {
  218. struct smb_hdr *pSMB = (struct smb_hdr *)buf;
  219. struct smb_t2_rsp *pSMBt;
  220. int remaining;
  221. __u16 total_data_size, data_in_this_rsp;
  222. if (pSMB->Command != SMB_COM_TRANSACTION2)
  223. return 0;
  224. /* check for plausible wct, bcc and t2 data and parm sizes */
  225. /* check for parm and data offset going beyond end of smb */
  226. if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
  227. cifs_dbg(FYI, "invalid transact2 word count\n");
  228. return -EINVAL;
  229. }
  230. pSMBt = (struct smb_t2_rsp *)pSMB;
  231. total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
  232. data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
  233. if (total_data_size == data_in_this_rsp)
  234. return 0;
  235. else if (total_data_size < data_in_this_rsp) {
  236. cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
  237. total_data_size, data_in_this_rsp);
  238. return -EINVAL;
  239. }
  240. remaining = total_data_size - data_in_this_rsp;
  241. cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
  242. remaining);
  243. if (total_data_size > CIFSMaxBufSize) {
  244. cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
  245. total_data_size, CIFSMaxBufSize);
  246. return -EINVAL;
  247. }
  248. return remaining;
  249. }
  250. static int
  251. coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
  252. {
  253. struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
  254. struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
  255. char *data_area_of_tgt;
  256. char *data_area_of_src;
  257. int remaining;
  258. unsigned int byte_count, total_in_tgt;
  259. __u16 tgt_total_cnt, src_total_cnt, total_in_src;
  260. src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
  261. tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
  262. if (tgt_total_cnt != src_total_cnt)
  263. cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
  264. src_total_cnt, tgt_total_cnt);
  265. total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
  266. remaining = tgt_total_cnt - total_in_tgt;
  267. if (remaining < 0) {
  268. cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n",
  269. tgt_total_cnt, total_in_tgt);
  270. return -EPROTO;
  271. }
  272. if (remaining == 0) {
  273. /* nothing to do, ignore */
  274. cifs_dbg(FYI, "no more data remains\n");
  275. return 0;
  276. }
  277. total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
  278. if (remaining < total_in_src)
  279. cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
  280. /* find end of first SMB data area */
  281. data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
  282. get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
  283. /* validate target area */
  284. data_area_of_src = (char *)&pSMBs->hdr.Protocol +
  285. get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
  286. data_area_of_tgt += total_in_tgt;
  287. total_in_tgt += total_in_src;
  288. /* is the result too big for the field? */
  289. if (total_in_tgt > USHRT_MAX) {
  290. cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
  291. total_in_tgt);
  292. return -EPROTO;
  293. }
  294. put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
  295. /* fix up the BCC */
  296. byte_count = get_bcc(target_hdr);
  297. byte_count += total_in_src;
  298. /* is the result too big for the field? */
  299. if (byte_count > USHRT_MAX) {
  300. cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
  301. return -EPROTO;
  302. }
  303. put_bcc(byte_count, target_hdr);
  304. byte_count = be32_to_cpu(target_hdr->smb_buf_length);
  305. byte_count += total_in_src;
  306. /* don't allow buffer to overflow */
  307. if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
  308. cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
  309. byte_count);
  310. return -ENOBUFS;
  311. }
  312. target_hdr->smb_buf_length = cpu_to_be32(byte_count);
  313. /* copy second buffer into end of first buffer */
  314. memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
  315. if (remaining != total_in_src) {
  316. /* more responses to go */
  317. cifs_dbg(FYI, "waiting for more secondary responses\n");
  318. return 1;
  319. }
  320. /* we are done */
  321. cifs_dbg(FYI, "found the last secondary response\n");
  322. return 0;
  323. }
  324. static bool
  325. cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
  326. char *buf, int malformed)
  327. {
  328. if (malformed)
  329. return false;
  330. if (check2ndT2(buf) <= 0)
  331. return false;
  332. mid->multiRsp = true;
  333. if (mid->resp_buf) {
  334. /* merge response - fix up 1st*/
  335. malformed = coalesce_t2(buf, mid->resp_buf);
  336. if (malformed > 0)
  337. return true;
  338. /* All parts received or packet is malformed. */
  339. mid->multiEnd = true;
  340. dequeue_mid(mid, malformed);
  341. return true;
  342. }
  343. if (!server->large_buf) {
  344. /*FIXME: switch to already allocated largebuf?*/
  345. cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
  346. } else {
  347. /* Have first buffer */
  348. mid->resp_buf = buf;
  349. mid->large_buf = true;
  350. server->bigbuf = NULL;
  351. }
  352. return true;
  353. }
  354. static bool
  355. cifs_need_neg(struct TCP_Server_Info *server)
  356. {
  357. return server->maxBuf == 0;
  358. }
  359. static int
  360. cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
  361. {
  362. int rc;
  363. rc = CIFSSMBNegotiate(xid, ses);
  364. if (rc == -EAGAIN) {
  365. /* retry only once on 1st time connection */
  366. set_credits(ses->server, 1);
  367. rc = CIFSSMBNegotiate(xid, ses);
  368. if (rc == -EAGAIN)
  369. rc = -EHOSTDOWN;
  370. }
  371. return rc;
  372. }
  373. static unsigned int
  374. cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
  375. {
  376. __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
  377. struct TCP_Server_Info *server = tcon->ses->server;
  378. unsigned int wsize;
  379. /* start with specified wsize, or default */
  380. if (volume_info->wsize)
  381. wsize = volume_info->wsize;
  382. else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
  383. wsize = CIFS_DEFAULT_IOSIZE;
  384. else
  385. wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
  386. /* can server support 24-bit write sizes? (via UNIX extensions) */
  387. if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
  388. wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
  389. /*
  390. * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
  391. * Limit it to max buffer offered by the server, minus the size of the
  392. * WRITEX header, not including the 4 byte RFC1001 length.
  393. */
  394. if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
  395. (!(server->capabilities & CAP_UNIX) &&
  396. (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
  397. wsize = min_t(unsigned int, wsize,
  398. server->maxBuf - sizeof(WRITE_REQ) + 4);
  399. /* hard limit of CIFS_MAX_WSIZE */
  400. wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
  401. return wsize;
  402. }
  403. static unsigned int
  404. cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
  405. {
  406. __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
  407. struct TCP_Server_Info *server = tcon->ses->server;
  408. unsigned int rsize, defsize;
  409. /*
  410. * Set default value...
  411. *
  412. * HACK alert! Ancient servers have very small buffers. Even though
  413. * MS-CIFS indicates that servers are only limited by the client's
  414. * bufsize for reads, testing against win98se shows that it throws
  415. * INVALID_PARAMETER errors if you try to request too large a read.
  416. * OS/2 just sends back short reads.
  417. *
  418. * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
  419. * it can't handle a read request larger than its MaxBufferSize either.
  420. */
  421. if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
  422. defsize = CIFS_DEFAULT_IOSIZE;
  423. else if (server->capabilities & CAP_LARGE_READ_X)
  424. defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
  425. else
  426. defsize = server->maxBuf - sizeof(READ_RSP);
  427. rsize = volume_info->rsize ? volume_info->rsize : defsize;
  428. /*
  429. * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
  430. * the client's MaxBufferSize.
  431. */
  432. if (!(server->capabilities & CAP_LARGE_READ_X))
  433. rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
  434. /* hard limit of CIFS_MAX_RSIZE */
  435. rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
  436. return rsize;
  437. }
  438. static void
  439. cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
  440. {
  441. CIFSSMBQFSDeviceInfo(xid, tcon);
  442. CIFSSMBQFSAttributeInfo(xid, tcon);
  443. }
  444. static int
  445. cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
  446. struct cifs_sb_info *cifs_sb, const char *full_path)
  447. {
  448. int rc;
  449. FILE_ALL_INFO *file_info;
  450. file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
  451. if (file_info == NULL)
  452. return -ENOMEM;
  453. rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
  454. 0 /* not legacy */, cifs_sb->local_nls,
  455. cifs_sb->mnt_cifs_flags &
  456. CIFS_MOUNT_MAP_SPECIAL_CHR);
  457. if (rc == -EOPNOTSUPP || rc == -EINVAL)
  458. rc = SMBQueryInformation(xid, tcon, full_path, file_info,
  459. cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  460. CIFS_MOUNT_MAP_SPECIAL_CHR);
  461. kfree(file_info);
  462. return rc;
  463. }
  464. static int
  465. cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
  466. struct cifs_sb_info *cifs_sb, const char *full_path,
  467. FILE_ALL_INFO *data, bool *adjustTZ)
  468. {
  469. int rc;
  470. /* could do find first instead but this returns more info */
  471. rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
  472. cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  473. CIFS_MOUNT_MAP_SPECIAL_CHR);
  474. /*
  475. * BB optimize code so we do not make the above call when server claims
  476. * no NT SMB support and the above call failed at least once - set flag
  477. * in tcon or mount.
  478. */
  479. if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
  480. rc = SMBQueryInformation(xid, tcon, full_path, data,
  481. cifs_sb->local_nls,
  482. cifs_sb->mnt_cifs_flags &
  483. CIFS_MOUNT_MAP_SPECIAL_CHR);
  484. *adjustTZ = true;
  485. }
  486. return rc;
  487. }
  488. static int
  489. cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
  490. struct cifs_sb_info *cifs_sb, const char *full_path,
  491. u64 *uniqueid, FILE_ALL_INFO *data)
  492. {
  493. /*
  494. * We can not use the IndexNumber field by default from Windows or
  495. * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
  496. * CIFS spec claims that this value is unique within the scope of a
  497. * share, and the windows docs hint that it's actually unique
  498. * per-machine.
  499. *
  500. * There may be higher info levels that work but are there Windows
  501. * server or network appliances for which IndexNumber field is not
  502. * guaranteed unique?
  503. */
  504. return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
  505. cifs_sb->local_nls,
  506. cifs_sb->mnt_cifs_flags &
  507. CIFS_MOUNT_MAP_SPECIAL_CHR);
  508. }
  509. static int
  510. cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
  511. struct cifs_fid *fid, FILE_ALL_INFO *data)
  512. {
  513. return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
  514. }
  515. static void
  516. cifs_clear_stats(struct cifs_tcon *tcon)
  517. {
  518. #ifdef CONFIG_CIFS_STATS
  519. atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
  520. atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
  521. atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
  522. atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
  523. atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
  524. atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
  525. atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
  526. atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
  527. atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
  528. atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
  529. atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
  530. atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
  531. atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
  532. atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
  533. atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
  534. atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
  535. atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
  536. atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
  537. atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
  538. atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
  539. atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
  540. #endif
  541. }
  542. static void
  543. cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
  544. {
  545. #ifdef CONFIG_CIFS_STATS
  546. seq_printf(m, " Oplocks breaks: %d",
  547. atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
  548. seq_printf(m, "\nReads: %d Bytes: %llu",
  549. atomic_read(&tcon->stats.cifs_stats.num_reads),
  550. (long long)(tcon->bytes_read));
  551. seq_printf(m, "\nWrites: %d Bytes: %llu",
  552. atomic_read(&tcon->stats.cifs_stats.num_writes),
  553. (long long)(tcon->bytes_written));
  554. seq_printf(m, "\nFlushes: %d",
  555. atomic_read(&tcon->stats.cifs_stats.num_flushes));
  556. seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
  557. atomic_read(&tcon->stats.cifs_stats.num_locks),
  558. atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
  559. atomic_read(&tcon->stats.cifs_stats.num_symlinks));
  560. seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
  561. atomic_read(&tcon->stats.cifs_stats.num_opens),
  562. atomic_read(&tcon->stats.cifs_stats.num_closes),
  563. atomic_read(&tcon->stats.cifs_stats.num_deletes));
  564. seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
  565. atomic_read(&tcon->stats.cifs_stats.num_posixopens),
  566. atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
  567. seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
  568. atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
  569. atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
  570. seq_printf(m, "\nRenames: %d T2 Renames %d",
  571. atomic_read(&tcon->stats.cifs_stats.num_renames),
  572. atomic_read(&tcon->stats.cifs_stats.num_t2renames));
  573. seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
  574. atomic_read(&tcon->stats.cifs_stats.num_ffirst),
  575. atomic_read(&tcon->stats.cifs_stats.num_fnext),
  576. atomic_read(&tcon->stats.cifs_stats.num_fclose));
  577. #endif
  578. }
  579. static void
  580. cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
  581. struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
  582. const unsigned int xid)
  583. {
  584. FILE_BASIC_INFO info;
  585. struct cifsInodeInfo *cifsInode;
  586. u32 dosattrs;
  587. int rc;
  588. memset(&info, 0, sizeof(info));
  589. cifsInode = CIFS_I(inode);
  590. dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
  591. info.Attributes = cpu_to_le32(dosattrs);
  592. rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
  593. cifs_sb->mnt_cifs_flags &
  594. CIFS_MOUNT_MAP_SPECIAL_CHR);
  595. if (rc == 0)
  596. cifsInode->cifsAttrs = dosattrs;
  597. }
  598. static int
  599. cifs_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
  600. int disposition, int desired_access, int create_options,
  601. struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
  602. struct cifs_sb_info *cifs_sb)
  603. {
  604. if (!(tcon->ses->capabilities & CAP_NT_SMBS))
  605. return SMBLegacyOpen(xid, tcon, path, disposition,
  606. desired_access, create_options,
  607. &fid->netfid, oplock, buf,
  608. cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
  609. & CIFS_MOUNT_MAP_SPECIAL_CHR);
  610. return CIFSSMBOpen(xid, tcon, path, disposition, desired_access,
  611. create_options, &fid->netfid, oplock, buf,
  612. cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
  613. CIFS_MOUNT_MAP_SPECIAL_CHR);
  614. }
  615. static void
  616. cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
  617. {
  618. struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
  619. cfile->fid.netfid = fid->netfid;
  620. cifs_set_oplock_level(cinode, oplock);
  621. cinode->can_cache_brlcks = cinode->clientCanCacheAll;
  622. }
  623. static void
  624. cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
  625. struct cifs_fid *fid)
  626. {
  627. CIFSSMBClose(xid, tcon, fid->netfid);
  628. }
  629. static int
  630. cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
  631. struct cifs_fid *fid)
  632. {
  633. return CIFSSMBFlush(xid, tcon, fid->netfid);
  634. }
  635. static int
  636. cifs_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
  637. struct cifs_io_parms *parms, unsigned int *bytes_read,
  638. char **buf, int *buf_type)
  639. {
  640. parms->netfid = cfile->fid.netfid;
  641. return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
  642. }
  643. static int
  644. cifs_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
  645. struct cifs_io_parms *parms, unsigned int *written,
  646. struct kvec *iov, unsigned long nr_segs)
  647. {
  648. parms->netfid = cfile->fid.netfid;
  649. return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
  650. }
  651. static int
  652. smb_set_file_info(struct inode *inode, const char *full_path,
  653. FILE_BASIC_INFO *buf, const unsigned int xid)
  654. {
  655. int oplock = 0;
  656. int rc;
  657. __u16 netfid;
  658. __u32 netpid;
  659. struct cifsFileInfo *open_file;
  660. struct cifsInodeInfo *cinode = CIFS_I(inode);
  661. struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  662. struct tcon_link *tlink = NULL;
  663. struct cifs_tcon *tcon;
  664. /* if the file is already open for write, just use that fileid */
  665. open_file = find_writable_file(cinode, true);
  666. if (open_file) {
  667. netfid = open_file->fid.netfid;
  668. netpid = open_file->pid;
  669. tcon = tlink_tcon(open_file->tlink);
  670. goto set_via_filehandle;
  671. }
  672. tlink = cifs_sb_tlink(cifs_sb);
  673. if (IS_ERR(tlink)) {
  674. rc = PTR_ERR(tlink);
  675. tlink = NULL;
  676. goto out;
  677. }
  678. tcon = tlink_tcon(tlink);
  679. /*
  680. * NT4 apparently returns success on this call, but it doesn't really
  681. * work.
  682. */
  683. if (!(tcon->ses->flags & CIFS_SES_NT4)) {
  684. rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf,
  685. cifs_sb->local_nls,
  686. cifs_sb->mnt_cifs_flags &
  687. CIFS_MOUNT_MAP_SPECIAL_CHR);
  688. if (rc == 0) {
  689. cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
  690. goto out;
  691. } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
  692. goto out;
  693. }
  694. cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
  695. rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
  696. SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
  697. &netfid, &oplock, NULL, cifs_sb->local_nls,
  698. cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
  699. if (rc != 0) {
  700. if (rc == -EIO)
  701. rc = -EINVAL;
  702. goto out;
  703. }
  704. netpid = current->tgid;
  705. set_via_filehandle:
  706. rc = CIFSSMBSetFileInfo(xid, tcon, buf, netfid, netpid);
  707. if (!rc)
  708. cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
  709. if (open_file == NULL)
  710. CIFSSMBClose(xid, tcon, netfid);
  711. else
  712. cifsFileInfo_put(open_file);
  713. out:
  714. if (tlink != NULL)
  715. cifs_put_tlink(tlink);
  716. return rc;
  717. }
  718. static int
  719. cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
  720. const char *path, struct cifs_sb_info *cifs_sb,
  721. struct cifs_fid *fid, __u16 search_flags,
  722. struct cifs_search_info *srch_inf)
  723. {
  724. return CIFSFindFirst(xid, tcon, path, cifs_sb,
  725. &fid->netfid, search_flags, srch_inf, true);
  726. }
  727. static int
  728. cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
  729. struct cifs_fid *fid, __u16 search_flags,
  730. struct cifs_search_info *srch_inf)
  731. {
  732. return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
  733. }
  734. static int
  735. cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
  736. struct cifs_fid *fid)
  737. {
  738. return CIFSFindClose(xid, tcon, fid->netfid);
  739. }
  740. static int
  741. cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
  742. struct cifsInodeInfo *cinode)
  743. {
  744. return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
  745. LOCKING_ANDX_OPLOCK_RELEASE, false,
  746. cinode->clientCanCacheRead ? 1 : 0);
  747. }
  748. static int
  749. cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
  750. struct kstatfs *buf)
  751. {
  752. int rc = -EOPNOTSUPP;
  753. buf->f_type = CIFS_MAGIC_NUMBER;
  754. /*
  755. * We could add a second check for a QFS Unix capability bit
  756. */
  757. if ((tcon->ses->capabilities & CAP_UNIX) &&
  758. (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
  759. rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
  760. /*
  761. * Only need to call the old QFSInfo if failed on newer one,
  762. * e.g. by OS/2.
  763. **/
  764. if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
  765. rc = CIFSSMBQFSInfo(xid, tcon, buf);
  766. /*
  767. * Some old Windows servers also do not support level 103, retry with
  768. * older level one if old server failed the previous call or we
  769. * bypassed it because we detected that this was an older LANMAN sess
  770. */
  771. if (rc)
  772. rc = SMBOldQFSInfo(xid, tcon, buf);
  773. return rc;
  774. }
  775. static int
  776. cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
  777. __u64 length, __u32 type, int lock, int unlock, bool wait)
  778. {
  779. return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
  780. current->tgid, length, offset, unlock, lock,
  781. (__u8)type, wait, 0);
  782. }
  783. struct smb_version_operations smb1_operations = {
  784. .send_cancel = send_nt_cancel,
  785. .compare_fids = cifs_compare_fids,
  786. .setup_request = cifs_setup_request,
  787. .setup_async_request = cifs_setup_async_request,
  788. .check_receive = cifs_check_receive,
  789. .add_credits = cifs_add_credits,
  790. .set_credits = cifs_set_credits,
  791. .get_credits_field = cifs_get_credits_field,
  792. .get_credits = cifs_get_credits,
  793. .get_next_mid = cifs_get_next_mid,
  794. .read_data_offset = cifs_read_data_offset,
  795. .read_data_length = cifs_read_data_length,
  796. .map_error = map_smb_to_linux_error,
  797. .find_mid = cifs_find_mid,
  798. .check_message = checkSMB,
  799. .dump_detail = cifs_dump_detail,
  800. .clear_stats = cifs_clear_stats,
  801. .print_stats = cifs_print_stats,
  802. .is_oplock_break = is_valid_oplock_break,
  803. .check_trans2 = cifs_check_trans2,
  804. .need_neg = cifs_need_neg,
  805. .negotiate = cifs_negotiate,
  806. .negotiate_wsize = cifs_negotiate_wsize,
  807. .negotiate_rsize = cifs_negotiate_rsize,
  808. .sess_setup = CIFS_SessSetup,
  809. .logoff = CIFSSMBLogoff,
  810. .tree_connect = CIFSTCon,
  811. .tree_disconnect = CIFSSMBTDis,
  812. .get_dfs_refer = CIFSGetDFSRefer,
  813. .qfs_tcon = cifs_qfs_tcon,
  814. .is_path_accessible = cifs_is_path_accessible,
  815. .query_path_info = cifs_query_path_info,
  816. .query_file_info = cifs_query_file_info,
  817. .get_srv_inum = cifs_get_srv_inum,
  818. .set_path_size = CIFSSMBSetEOF,
  819. .set_file_size = CIFSSMBSetFileSize,
  820. .set_file_info = smb_set_file_info,
  821. .echo = CIFSSMBEcho,
  822. .mkdir = CIFSSMBMkDir,
  823. .mkdir_setinfo = cifs_mkdir_setinfo,
  824. .rmdir = CIFSSMBRmDir,
  825. .unlink = CIFSSMBDelFile,
  826. .rename_pending_delete = cifs_rename_pending_delete,
  827. .rename = CIFSSMBRename,
  828. .create_hardlink = CIFSCreateHardLink,
  829. .open = cifs_open_file,
  830. .set_fid = cifs_set_fid,
  831. .close = cifs_close_file,
  832. .flush = cifs_flush_file,
  833. .async_readv = cifs_async_readv,
  834. .async_writev = cifs_async_writev,
  835. .sync_read = cifs_sync_read,
  836. .sync_write = cifs_sync_write,
  837. .query_dir_first = cifs_query_dir_first,
  838. .query_dir_next = cifs_query_dir_next,
  839. .close_dir = cifs_close_dir,
  840. .calc_smb_size = smbCalcSize,
  841. .oplock_response = cifs_oplock_response,
  842. .queryfs = cifs_queryfs,
  843. .mand_lock = cifs_mand_lock,
  844. .mand_unlock_range = cifs_unlock_range,
  845. .push_mand_locks = cifs_push_mandatory_locks,
  846. };
  847. struct smb_version_values smb1_values = {
  848. .version_string = SMB1_VERSION_STRING,
  849. .large_lock_type = LOCKING_ANDX_LARGE_FILES,
  850. .exclusive_lock_type = 0,
  851. .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
  852. .unlock_lock_type = 0,
  853. .header_size = sizeof(struct smb_hdr),
  854. .max_header_size = MAX_CIFS_HDR_SIZE,
  855. .read_rsp_size = sizeof(READ_RSP),
  856. .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
  857. .cap_unix = CAP_UNIX,
  858. .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
  859. .cap_large_files = CAP_LARGE_FILES,
  860. .oplock_read = OPLOCK_READ,
  861. };