nfs4callback.c 34 KB

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  1. /*
  2. * Copyright (c) 2001 The Regents of the University of Michigan.
  3. * All rights reserved.
  4. *
  5. * Kendrick Smith <kmsmith@umich.edu>
  6. * Andy Adamson <andros@umich.edu>
  7. *
  8. * Redistribution and use in source and binary forms, with or without
  9. * modification, are permitted provided that the following conditions
  10. * are met:
  11. *
  12. * 1. Redistributions of source code must retain the above copyright
  13. * notice, this list of conditions and the following disclaimer.
  14. * 2. Redistributions in binary form must reproduce the above copyright
  15. * notice, this list of conditions and the following disclaimer in the
  16. * documentation and/or other materials provided with the distribution.
  17. * 3. Neither the name of the University nor the names of its
  18. * contributors may be used to endorse or promote products derived
  19. * from this software without specific prior written permission.
  20. *
  21. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24. * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26. * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27. * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28. * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29. * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30. * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32. */
  33. #include <linux/sunrpc/clnt.h>
  34. #include <linux/sunrpc/xprt.h>
  35. #include <linux/sunrpc/svc_xprt.h>
  36. #include <linux/slab.h>
  37. #include "nfsd.h"
  38. #include "state.h"
  39. #include "netns.h"
  40. #include "trace.h"
  41. #include "xdr4cb.h"
  42. #include "xdr4.h"
  43. #define NFSDDBG_FACILITY NFSDDBG_PROC
  44. static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
  45. #define NFSPROC4_CB_NULL 0
  46. #define NFSPROC4_CB_COMPOUND 1
  47. /* Index of predefined Linux callback client operations */
  48. struct nfs4_cb_compound_hdr {
  49. /* args */
  50. u32 ident; /* minorversion 0 only */
  51. u32 nops;
  52. __be32 *nops_p;
  53. u32 minorversion;
  54. /* res */
  55. int status;
  56. };
  57. static __be32 *xdr_encode_empty_array(__be32 *p)
  58. {
  59. *p++ = xdr_zero;
  60. return p;
  61. }
  62. /*
  63. * Encode/decode NFSv4 CB basic data types
  64. *
  65. * Basic NFSv4 callback data types are defined in section 15 of RFC
  66. * 3530: "Network File System (NFS) version 4 Protocol" and section
  67. * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
  68. * 1 Protocol"
  69. */
  70. /*
  71. * nfs_cb_opnum4
  72. *
  73. * enum nfs_cb_opnum4 {
  74. * OP_CB_GETATTR = 3,
  75. * ...
  76. * };
  77. */
  78. enum nfs_cb_opnum4 {
  79. OP_CB_GETATTR = 3,
  80. OP_CB_RECALL = 4,
  81. OP_CB_LAYOUTRECALL = 5,
  82. OP_CB_NOTIFY = 6,
  83. OP_CB_PUSH_DELEG = 7,
  84. OP_CB_RECALL_ANY = 8,
  85. OP_CB_RECALLABLE_OBJ_AVAIL = 9,
  86. OP_CB_RECALL_SLOT = 10,
  87. OP_CB_SEQUENCE = 11,
  88. OP_CB_WANTS_CANCELLED = 12,
  89. OP_CB_NOTIFY_LOCK = 13,
  90. OP_CB_NOTIFY_DEVICEID = 14,
  91. OP_CB_OFFLOAD = 15,
  92. OP_CB_ILLEGAL = 10044
  93. };
  94. static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
  95. {
  96. __be32 *p;
  97. p = xdr_reserve_space(xdr, 4);
  98. *p = cpu_to_be32(op);
  99. }
  100. /*
  101. * nfs_fh4
  102. *
  103. * typedef opaque nfs_fh4<NFS4_FHSIZE>;
  104. */
  105. static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
  106. {
  107. u32 length = fh->fh_size;
  108. __be32 *p;
  109. BUG_ON(length > NFS4_FHSIZE);
  110. p = xdr_reserve_space(xdr, 4 + length);
  111. xdr_encode_opaque(p, &fh->fh_base, length);
  112. }
  113. /*
  114. * stateid4
  115. *
  116. * struct stateid4 {
  117. * uint32_t seqid;
  118. * opaque other[12];
  119. * };
  120. */
  121. static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
  122. {
  123. __be32 *p;
  124. p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
  125. *p++ = cpu_to_be32(sid->si_generation);
  126. xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
  127. }
  128. /*
  129. * sessionid4
  130. *
  131. * typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
  132. */
  133. static void encode_sessionid4(struct xdr_stream *xdr,
  134. const struct nfsd4_session *session)
  135. {
  136. __be32 *p;
  137. p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
  138. xdr_encode_opaque_fixed(p, session->se_sessionid.data,
  139. NFS4_MAX_SESSIONID_LEN);
  140. }
  141. /*
  142. * nfsstat4
  143. */
  144. static const struct {
  145. int stat;
  146. int errno;
  147. } nfs_cb_errtbl[] = {
  148. { NFS4_OK, 0 },
  149. { NFS4ERR_PERM, -EPERM },
  150. { NFS4ERR_NOENT, -ENOENT },
  151. { NFS4ERR_IO, -EIO },
  152. { NFS4ERR_NXIO, -ENXIO },
  153. { NFS4ERR_ACCESS, -EACCES },
  154. { NFS4ERR_EXIST, -EEXIST },
  155. { NFS4ERR_XDEV, -EXDEV },
  156. { NFS4ERR_NOTDIR, -ENOTDIR },
  157. { NFS4ERR_ISDIR, -EISDIR },
  158. { NFS4ERR_INVAL, -EINVAL },
  159. { NFS4ERR_FBIG, -EFBIG },
  160. { NFS4ERR_NOSPC, -ENOSPC },
  161. { NFS4ERR_ROFS, -EROFS },
  162. { NFS4ERR_MLINK, -EMLINK },
  163. { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
  164. { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
  165. { NFS4ERR_DQUOT, -EDQUOT },
  166. { NFS4ERR_STALE, -ESTALE },
  167. { NFS4ERR_BADHANDLE, -EBADHANDLE },
  168. { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
  169. { NFS4ERR_NOTSUPP, -ENOTSUPP },
  170. { NFS4ERR_TOOSMALL, -ETOOSMALL },
  171. { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
  172. { NFS4ERR_BADTYPE, -EBADTYPE },
  173. { NFS4ERR_LOCKED, -EAGAIN },
  174. { NFS4ERR_RESOURCE, -EREMOTEIO },
  175. { NFS4ERR_SYMLINK, -ELOOP },
  176. { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
  177. { NFS4ERR_DEADLOCK, -EDEADLK },
  178. { -1, -EIO }
  179. };
  180. /*
  181. * If we cannot translate the error, the recovery routines should
  182. * handle it.
  183. *
  184. * Note: remaining NFSv4 error codes have values > 10000, so should
  185. * not conflict with native Linux error codes.
  186. */
  187. static int nfs_cb_stat_to_errno(int status)
  188. {
  189. int i;
  190. for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
  191. if (nfs_cb_errtbl[i].stat == status)
  192. return nfs_cb_errtbl[i].errno;
  193. }
  194. dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
  195. return -status;
  196. }
  197. static int decode_cb_op_status(struct xdr_stream *xdr,
  198. enum nfs_cb_opnum4 expected, int *status)
  199. {
  200. __be32 *p;
  201. u32 op;
  202. p = xdr_inline_decode(xdr, 4 + 4);
  203. if (unlikely(p == NULL))
  204. goto out_overflow;
  205. op = be32_to_cpup(p++);
  206. if (unlikely(op != expected))
  207. goto out_unexpected;
  208. *status = nfs_cb_stat_to_errno(be32_to_cpup(p));
  209. return 0;
  210. out_overflow:
  211. return -EIO;
  212. out_unexpected:
  213. dprintk("NFSD: Callback server returned operation %d but "
  214. "we issued a request for %d\n", op, expected);
  215. return -EIO;
  216. }
  217. /*
  218. * CB_COMPOUND4args
  219. *
  220. * struct CB_COMPOUND4args {
  221. * utf8str_cs tag;
  222. * uint32_t minorversion;
  223. * uint32_t callback_ident;
  224. * nfs_cb_argop4 argarray<>;
  225. * };
  226. */
  227. static void encode_cb_compound4args(struct xdr_stream *xdr,
  228. struct nfs4_cb_compound_hdr *hdr)
  229. {
  230. __be32 * p;
  231. p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
  232. p = xdr_encode_empty_array(p); /* empty tag */
  233. *p++ = cpu_to_be32(hdr->minorversion);
  234. *p++ = cpu_to_be32(hdr->ident);
  235. hdr->nops_p = p;
  236. *p = cpu_to_be32(hdr->nops); /* argarray element count */
  237. }
  238. /*
  239. * Update argarray element count
  240. */
  241. static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
  242. {
  243. BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
  244. *hdr->nops_p = cpu_to_be32(hdr->nops);
  245. }
  246. /*
  247. * CB_COMPOUND4res
  248. *
  249. * struct CB_COMPOUND4res {
  250. * nfsstat4 status;
  251. * utf8str_cs tag;
  252. * nfs_cb_resop4 resarray<>;
  253. * };
  254. */
  255. static int decode_cb_compound4res(struct xdr_stream *xdr,
  256. struct nfs4_cb_compound_hdr *hdr)
  257. {
  258. u32 length;
  259. __be32 *p;
  260. p = xdr_inline_decode(xdr, 4 + 4);
  261. if (unlikely(p == NULL))
  262. goto out_overflow;
  263. hdr->status = be32_to_cpup(p++);
  264. /* Ignore the tag */
  265. length = be32_to_cpup(p++);
  266. p = xdr_inline_decode(xdr, length + 4);
  267. if (unlikely(p == NULL))
  268. goto out_overflow;
  269. p += XDR_QUADLEN(length);
  270. hdr->nops = be32_to_cpup(p);
  271. return 0;
  272. out_overflow:
  273. return -EIO;
  274. }
  275. /*
  276. * CB_RECALL4args
  277. *
  278. * struct CB_RECALL4args {
  279. * stateid4 stateid;
  280. * bool truncate;
  281. * nfs_fh4 fh;
  282. * };
  283. */
  284. static void encode_cb_recall4args(struct xdr_stream *xdr,
  285. const struct nfs4_delegation *dp,
  286. struct nfs4_cb_compound_hdr *hdr)
  287. {
  288. __be32 *p;
  289. encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
  290. encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
  291. p = xdr_reserve_space(xdr, 4);
  292. *p++ = xdr_zero; /* truncate */
  293. encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
  294. hdr->nops++;
  295. }
  296. /*
  297. * CB_SEQUENCE4args
  298. *
  299. * struct CB_SEQUENCE4args {
  300. * sessionid4 csa_sessionid;
  301. * sequenceid4 csa_sequenceid;
  302. * slotid4 csa_slotid;
  303. * slotid4 csa_highest_slotid;
  304. * bool csa_cachethis;
  305. * referring_call_list4 csa_referring_call_lists<>;
  306. * };
  307. */
  308. static void encode_cb_sequence4args(struct xdr_stream *xdr,
  309. const struct nfsd4_callback *cb,
  310. struct nfs4_cb_compound_hdr *hdr)
  311. {
  312. struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
  313. __be32 *p;
  314. if (hdr->minorversion == 0)
  315. return;
  316. encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
  317. encode_sessionid4(xdr, session);
  318. p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
  319. *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
  320. *p++ = xdr_zero; /* csa_slotid */
  321. *p++ = xdr_zero; /* csa_highest_slotid */
  322. *p++ = xdr_zero; /* csa_cachethis */
  323. xdr_encode_empty_array(p); /* csa_referring_call_lists */
  324. hdr->nops++;
  325. }
  326. /*
  327. * CB_SEQUENCE4resok
  328. *
  329. * struct CB_SEQUENCE4resok {
  330. * sessionid4 csr_sessionid;
  331. * sequenceid4 csr_sequenceid;
  332. * slotid4 csr_slotid;
  333. * slotid4 csr_highest_slotid;
  334. * slotid4 csr_target_highest_slotid;
  335. * };
  336. *
  337. * union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
  338. * case NFS4_OK:
  339. * CB_SEQUENCE4resok csr_resok4;
  340. * default:
  341. * void;
  342. * };
  343. *
  344. * Our current back channel implmentation supports a single backchannel
  345. * with a single slot.
  346. */
  347. static int decode_cb_sequence4resok(struct xdr_stream *xdr,
  348. struct nfsd4_callback *cb)
  349. {
  350. struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
  351. int status = -ESERVERFAULT;
  352. __be32 *p;
  353. u32 dummy;
  354. /*
  355. * If the server returns different values for sessionID, slotID or
  356. * sequence number, the server is looney tunes.
  357. */
  358. p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
  359. if (unlikely(p == NULL))
  360. goto out_overflow;
  361. if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
  362. dprintk("NFS: %s Invalid session id\n", __func__);
  363. goto out;
  364. }
  365. p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
  366. dummy = be32_to_cpup(p++);
  367. if (dummy != session->se_cb_seq_nr) {
  368. dprintk("NFS: %s Invalid sequence number\n", __func__);
  369. goto out;
  370. }
  371. dummy = be32_to_cpup(p++);
  372. if (dummy != 0) {
  373. dprintk("NFS: %s Invalid slotid\n", __func__);
  374. goto out;
  375. }
  376. /*
  377. * FIXME: process highest slotid and target highest slotid
  378. */
  379. status = 0;
  380. out:
  381. cb->cb_seq_status = status;
  382. return status;
  383. out_overflow:
  384. status = -EIO;
  385. goto out;
  386. }
  387. static int decode_cb_sequence4res(struct xdr_stream *xdr,
  388. struct nfsd4_callback *cb)
  389. {
  390. int status;
  391. if (cb->cb_clp->cl_minorversion == 0)
  392. return 0;
  393. status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
  394. if (unlikely(status || cb->cb_seq_status))
  395. return status;
  396. return decode_cb_sequence4resok(xdr, cb);
  397. }
  398. /*
  399. * NFSv4.0 and NFSv4.1 XDR encode functions
  400. *
  401. * NFSv4.0 callback argument types are defined in section 15 of RFC
  402. * 3530: "Network File System (NFS) version 4 Protocol" and section 20
  403. * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
  404. * Protocol".
  405. */
  406. /*
  407. * NB: Without this zero space reservation, callbacks over krb5p fail
  408. */
  409. static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
  410. const void *__unused)
  411. {
  412. xdr_reserve_space(xdr, 0);
  413. }
  414. /*
  415. * 20.2. Operation 4: CB_RECALL - Recall a Delegation
  416. */
  417. static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
  418. const void *data)
  419. {
  420. const struct nfsd4_callback *cb = data;
  421. const struct nfs4_delegation *dp = cb_to_delegation(cb);
  422. struct nfs4_cb_compound_hdr hdr = {
  423. .ident = cb->cb_clp->cl_cb_ident,
  424. .minorversion = cb->cb_clp->cl_minorversion,
  425. };
  426. encode_cb_compound4args(xdr, &hdr);
  427. encode_cb_sequence4args(xdr, cb, &hdr);
  428. encode_cb_recall4args(xdr, dp, &hdr);
  429. encode_cb_nops(&hdr);
  430. }
  431. /*
  432. * NFSv4.0 and NFSv4.1 XDR decode functions
  433. *
  434. * NFSv4.0 callback result types are defined in section 15 of RFC
  435. * 3530: "Network File System (NFS) version 4 Protocol" and section 20
  436. * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
  437. * Protocol".
  438. */
  439. static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
  440. void *__unused)
  441. {
  442. return 0;
  443. }
  444. /*
  445. * 20.2. Operation 4: CB_RECALL - Recall a Delegation
  446. */
  447. static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
  448. struct xdr_stream *xdr,
  449. void *data)
  450. {
  451. struct nfsd4_callback *cb = data;
  452. struct nfs4_cb_compound_hdr hdr;
  453. int status;
  454. status = decode_cb_compound4res(xdr, &hdr);
  455. if (unlikely(status))
  456. return status;
  457. status = decode_cb_sequence4res(xdr, cb);
  458. if (unlikely(status || cb->cb_seq_status))
  459. return status;
  460. return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
  461. }
  462. #ifdef CONFIG_NFSD_PNFS
  463. /*
  464. * CB_LAYOUTRECALL4args
  465. *
  466. * struct layoutrecall_file4 {
  467. * nfs_fh4 lor_fh;
  468. * offset4 lor_offset;
  469. * length4 lor_length;
  470. * stateid4 lor_stateid;
  471. * };
  472. *
  473. * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) {
  474. * case LAYOUTRECALL4_FILE:
  475. * layoutrecall_file4 lor_layout;
  476. * case LAYOUTRECALL4_FSID:
  477. * fsid4 lor_fsid;
  478. * case LAYOUTRECALL4_ALL:
  479. * void;
  480. * };
  481. *
  482. * struct CB_LAYOUTRECALL4args {
  483. * layouttype4 clora_type;
  484. * layoutiomode4 clora_iomode;
  485. * bool clora_changed;
  486. * layoutrecall4 clora_recall;
  487. * };
  488. */
  489. static void encode_cb_layout4args(struct xdr_stream *xdr,
  490. const struct nfs4_layout_stateid *ls,
  491. struct nfs4_cb_compound_hdr *hdr)
  492. {
  493. __be32 *p;
  494. BUG_ON(hdr->minorversion == 0);
  495. p = xdr_reserve_space(xdr, 5 * 4);
  496. *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
  497. *p++ = cpu_to_be32(ls->ls_layout_type);
  498. *p++ = cpu_to_be32(IOMODE_ANY);
  499. *p++ = cpu_to_be32(1);
  500. *p = cpu_to_be32(RETURN_FILE);
  501. encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);
  502. p = xdr_reserve_space(xdr, 2 * 8);
  503. p = xdr_encode_hyper(p, 0);
  504. xdr_encode_hyper(p, NFS4_MAX_UINT64);
  505. encode_stateid4(xdr, &ls->ls_recall_sid);
  506. hdr->nops++;
  507. }
  508. static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
  509. struct xdr_stream *xdr,
  510. const void *data)
  511. {
  512. const struct nfsd4_callback *cb = data;
  513. const struct nfs4_layout_stateid *ls =
  514. container_of(cb, struct nfs4_layout_stateid, ls_recall);
  515. struct nfs4_cb_compound_hdr hdr = {
  516. .ident = 0,
  517. .minorversion = cb->cb_clp->cl_minorversion,
  518. };
  519. encode_cb_compound4args(xdr, &hdr);
  520. encode_cb_sequence4args(xdr, cb, &hdr);
  521. encode_cb_layout4args(xdr, ls, &hdr);
  522. encode_cb_nops(&hdr);
  523. }
  524. static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
  525. struct xdr_stream *xdr,
  526. void *data)
  527. {
  528. struct nfsd4_callback *cb = data;
  529. struct nfs4_cb_compound_hdr hdr;
  530. int status;
  531. status = decode_cb_compound4res(xdr, &hdr);
  532. if (unlikely(status))
  533. return status;
  534. status = decode_cb_sequence4res(xdr, cb);
  535. if (unlikely(status || cb->cb_seq_status))
  536. return status;
  537. return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
  538. }
  539. #endif /* CONFIG_NFSD_PNFS */
  540. static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
  541. {
  542. __be32 *p;
  543. p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
  544. p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
  545. xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
  546. }
  547. static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
  548. struct xdr_stream *xdr,
  549. const void *data)
  550. {
  551. const struct nfsd4_callback *cb = data;
  552. const struct nfsd4_blocked_lock *nbl =
  553. container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
  554. struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
  555. struct nfs4_cb_compound_hdr hdr = {
  556. .ident = 0,
  557. .minorversion = cb->cb_clp->cl_minorversion,
  558. };
  559. __be32 *p;
  560. BUG_ON(hdr.minorversion == 0);
  561. encode_cb_compound4args(xdr, &hdr);
  562. encode_cb_sequence4args(xdr, cb, &hdr);
  563. p = xdr_reserve_space(xdr, 4);
  564. *p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
  565. encode_nfs_fh4(xdr, &nbl->nbl_fh);
  566. encode_stateowner(xdr, &lo->lo_owner);
  567. hdr.nops++;
  568. encode_cb_nops(&hdr);
  569. }
  570. static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
  571. struct xdr_stream *xdr,
  572. void *data)
  573. {
  574. struct nfsd4_callback *cb = data;
  575. struct nfs4_cb_compound_hdr hdr;
  576. int status;
  577. status = decode_cb_compound4res(xdr, &hdr);
  578. if (unlikely(status))
  579. return status;
  580. status = decode_cb_sequence4res(xdr, cb);
  581. if (unlikely(status || cb->cb_seq_status))
  582. return status;
  583. return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
  584. }
  585. /*
  586. * struct write_response4 {
  587. * stateid4 wr_callback_id<1>;
  588. * length4 wr_count;
  589. * stable_how4 wr_committed;
  590. * verifier4 wr_writeverf;
  591. * };
  592. * union offload_info4 switch (nfsstat4 coa_status) {
  593. * case NFS4_OK:
  594. * write_response4 coa_resok4;
  595. * default:
  596. * length4 coa_bytes_copied;
  597. * };
  598. * struct CB_OFFLOAD4args {
  599. * nfs_fh4 coa_fh;
  600. * stateid4 coa_stateid;
  601. * offload_info4 coa_offload_info;
  602. * };
  603. */
  604. static void encode_offload_info4(struct xdr_stream *xdr,
  605. __be32 nfserr,
  606. const struct nfsd4_copy *cp)
  607. {
  608. __be32 *p;
  609. p = xdr_reserve_space(xdr, 4);
  610. *p++ = nfserr;
  611. if (!nfserr) {
  612. p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
  613. p = xdr_encode_empty_array(p);
  614. p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written);
  615. *p++ = cpu_to_be32(cp->cp_res.wr_stable_how);
  616. p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data,
  617. NFS4_VERIFIER_SIZE);
  618. } else {
  619. p = xdr_reserve_space(xdr, 8);
  620. /* We always return success if bytes were written */
  621. p = xdr_encode_hyper(p, 0);
  622. }
  623. }
  624. static void encode_cb_offload4args(struct xdr_stream *xdr,
  625. __be32 nfserr,
  626. const struct knfsd_fh *fh,
  627. const struct nfsd4_copy *cp,
  628. struct nfs4_cb_compound_hdr *hdr)
  629. {
  630. __be32 *p;
  631. p = xdr_reserve_space(xdr, 4);
  632. *p++ = cpu_to_be32(OP_CB_OFFLOAD);
  633. encode_nfs_fh4(xdr, fh);
  634. encode_stateid4(xdr, &cp->cp_res.cb_stateid);
  635. encode_offload_info4(xdr, nfserr, cp);
  636. hdr->nops++;
  637. }
  638. static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
  639. struct xdr_stream *xdr,
  640. const void *data)
  641. {
  642. const struct nfsd4_callback *cb = data;
  643. const struct nfsd4_copy *cp =
  644. container_of(cb, struct nfsd4_copy, cp_cb);
  645. struct nfs4_cb_compound_hdr hdr = {
  646. .ident = 0,
  647. .minorversion = cb->cb_clp->cl_minorversion,
  648. };
  649. encode_cb_compound4args(xdr, &hdr);
  650. encode_cb_sequence4args(xdr, cb, &hdr);
  651. encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr);
  652. encode_cb_nops(&hdr);
  653. }
  654. static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp,
  655. struct xdr_stream *xdr,
  656. void *data)
  657. {
  658. struct nfsd4_callback *cb = data;
  659. struct nfs4_cb_compound_hdr hdr;
  660. int status;
  661. status = decode_cb_compound4res(xdr, &hdr);
  662. if (unlikely(status))
  663. return status;
  664. status = decode_cb_sequence4res(xdr, cb);
  665. if (unlikely(status || cb->cb_seq_status))
  666. return status;
  667. return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status);
  668. }
  669. /*
  670. * RPC procedure tables
  671. */
  672. #define PROC(proc, call, argtype, restype) \
  673. [NFSPROC4_CLNT_##proc] = { \
  674. .p_proc = NFSPROC4_CB_##call, \
  675. .p_encode = nfs4_xdr_enc_##argtype, \
  676. .p_decode = nfs4_xdr_dec_##restype, \
  677. .p_arglen = NFS4_enc_##argtype##_sz, \
  678. .p_replen = NFS4_dec_##restype##_sz, \
  679. .p_statidx = NFSPROC4_CB_##call, \
  680. .p_name = #proc, \
  681. }
  682. static const struct rpc_procinfo nfs4_cb_procedures[] = {
  683. PROC(CB_NULL, NULL, cb_null, cb_null),
  684. PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
  685. #ifdef CONFIG_NFSD_PNFS
  686. PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout),
  687. #endif
  688. PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
  689. PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
  690. };
  691. static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
  692. static const struct rpc_version nfs_cb_version4 = {
  693. /*
  694. * Note on the callback rpc program version number: despite language in rfc
  695. * 5661 section 18.36.3 requiring servers to use 4 in this field, the
  696. * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
  697. * in practice that appears to be what implementations use. The section
  698. * 18.36.3 language is expected to be fixed in an erratum.
  699. */
  700. .number = 1,
  701. .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
  702. .procs = nfs4_cb_procedures,
  703. .counts = nfs4_cb_counts,
  704. };
  705. static const struct rpc_version *nfs_cb_version[2] = {
  706. [1] = &nfs_cb_version4,
  707. };
  708. static const struct rpc_program cb_program;
  709. static struct rpc_stat cb_stats = {
  710. .program = &cb_program
  711. };
  712. #define NFS4_CALLBACK 0x40000000
  713. static const struct rpc_program cb_program = {
  714. .name = "nfs4_cb",
  715. .number = NFS4_CALLBACK,
  716. .nrvers = ARRAY_SIZE(nfs_cb_version),
  717. .version = nfs_cb_version,
  718. .stats = &cb_stats,
  719. .pipe_dir_name = "nfsd4_cb",
  720. };
  721. static int max_cb_time(struct net *net)
  722. {
  723. struct nfsd_net *nn = net_generic(net, nfsd_net_id);
  724. /*
  725. * nfsd4_lease is set to at most one hour in __nfsd4_write_time,
  726. * so we can use 32-bit math on it. Warn if that assumption
  727. * ever stops being true.
  728. */
  729. if (WARN_ON_ONCE(nn->nfsd4_lease > 3600))
  730. return 360 * HZ;
  731. return max(((u32)nn->nfsd4_lease)/10, 1u) * HZ;
  732. }
  733. static struct workqueue_struct *callback_wq;
  734. static bool nfsd4_queue_cb(struct nfsd4_callback *cb)
  735. {
  736. return queue_work(callback_wq, &cb->cb_work);
  737. }
  738. static void nfsd41_cb_inflight_begin(struct nfs4_client *clp)
  739. {
  740. atomic_inc(&clp->cl_cb_inflight);
  741. }
  742. static void nfsd41_cb_inflight_end(struct nfs4_client *clp)
  743. {
  744. if (atomic_dec_and_test(&clp->cl_cb_inflight))
  745. wake_up_var(&clp->cl_cb_inflight);
  746. }
  747. static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp)
  748. {
  749. wait_var_event(&clp->cl_cb_inflight,
  750. !atomic_read(&clp->cl_cb_inflight));
  751. }
  752. static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
  753. {
  754. if (clp->cl_minorversion == 0) {
  755. client->cl_principal = clp->cl_cred.cr_targ_princ ?
  756. clp->cl_cred.cr_targ_princ : "nfs";
  757. return get_cred(rpc_machine_cred());
  758. } else {
  759. struct cred *kcred;
  760. kcred = prepare_kernel_cred(NULL);
  761. if (!kcred)
  762. return NULL;
  763. kcred->uid = ses->se_cb_sec.uid;
  764. kcred->gid = ses->se_cb_sec.gid;
  765. return kcred;
  766. }
  767. }
  768. static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
  769. {
  770. int maxtime = max_cb_time(clp->net);
  771. struct rpc_timeout timeparms = {
  772. .to_initval = maxtime,
  773. .to_retries = 0,
  774. .to_maxval = maxtime,
  775. };
  776. struct rpc_create_args args = {
  777. .net = clp->net,
  778. .address = (struct sockaddr *) &conn->cb_addr,
  779. .addrsize = conn->cb_addrlen,
  780. .saddress = (struct sockaddr *) &conn->cb_saddr,
  781. .timeout = &timeparms,
  782. .program = &cb_program,
  783. .version = 1,
  784. .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
  785. .cred = current_cred(),
  786. };
  787. struct rpc_clnt *client;
  788. const struct cred *cred;
  789. if (clp->cl_minorversion == 0) {
  790. if (!clp->cl_cred.cr_principal &&
  791. (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) {
  792. trace_nfsd_cb_setup_err(clp, -EINVAL);
  793. return -EINVAL;
  794. }
  795. args.client_name = clp->cl_cred.cr_principal;
  796. args.prognumber = conn->cb_prog;
  797. args.protocol = XPRT_TRANSPORT_TCP;
  798. args.authflavor = clp->cl_cred.cr_flavor;
  799. clp->cl_cb_ident = conn->cb_ident;
  800. } else {
  801. if (!conn->cb_xprt) {
  802. trace_nfsd_cb_setup_err(clp, -EINVAL);
  803. return -EINVAL;
  804. }
  805. clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
  806. clp->cl_cb_session = ses;
  807. args.bc_xprt = conn->cb_xprt;
  808. args.prognumber = clp->cl_cb_session->se_cb_prog;
  809. args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
  810. XPRT_TRANSPORT_BC;
  811. args.authflavor = ses->se_cb_sec.flavor;
  812. }
  813. /* Create RPC client */
  814. client = rpc_create(&args);
  815. if (IS_ERR(client)) {
  816. trace_nfsd_cb_setup_err(clp, PTR_ERR(client));
  817. return PTR_ERR(client);
  818. }
  819. cred = get_backchannel_cred(clp, client, ses);
  820. if (!cred) {
  821. trace_nfsd_cb_setup_err(clp, -ENOMEM);
  822. rpc_shutdown_client(client);
  823. return -ENOMEM;
  824. }
  825. clp->cl_cb_client = client;
  826. clp->cl_cb_cred = cred;
  827. trace_nfsd_cb_setup(clp);
  828. return 0;
  829. }
  830. static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
  831. {
  832. if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
  833. return;
  834. clp->cl_cb_state = NFSD4_CB_DOWN;
  835. trace_nfsd_cb_state(clp);
  836. }
  837. static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
  838. {
  839. if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
  840. return;
  841. clp->cl_cb_state = NFSD4_CB_FAULT;
  842. trace_nfsd_cb_state(clp);
  843. }
  844. static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
  845. {
  846. struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
  847. trace_nfsd_cb_done(clp, task->tk_status);
  848. if (task->tk_status)
  849. nfsd4_mark_cb_down(clp, task->tk_status);
  850. else {
  851. clp->cl_cb_state = NFSD4_CB_UP;
  852. trace_nfsd_cb_state(clp);
  853. }
  854. }
  855. static void nfsd4_cb_probe_release(void *calldata)
  856. {
  857. struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
  858. nfsd41_cb_inflight_end(clp);
  859. }
  860. static const struct rpc_call_ops nfsd4_cb_probe_ops = {
  861. /* XXX: release method to ensure we set the cb channel down if
  862. * necessary on early failure? */
  863. .rpc_call_done = nfsd4_cb_probe_done,
  864. .rpc_release = nfsd4_cb_probe_release,
  865. };
  866. /*
  867. * Poke the callback thread to process any updates to the callback
  868. * parameters, and send a null probe.
  869. */
  870. void nfsd4_probe_callback(struct nfs4_client *clp)
  871. {
  872. clp->cl_cb_state = NFSD4_CB_UNKNOWN;
  873. trace_nfsd_cb_state(clp);
  874. set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
  875. nfsd4_run_cb(&clp->cl_cb_null);
  876. }
  877. void nfsd4_probe_callback_sync(struct nfs4_client *clp)
  878. {
  879. nfsd4_probe_callback(clp);
  880. flush_workqueue(callback_wq);
  881. }
  882. void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
  883. {
  884. clp->cl_cb_state = NFSD4_CB_UNKNOWN;
  885. spin_lock(&clp->cl_lock);
  886. memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
  887. spin_unlock(&clp->cl_lock);
  888. trace_nfsd_cb_state(clp);
  889. }
  890. /*
  891. * There's currently a single callback channel slot.
  892. * If the slot is available, then mark it busy. Otherwise, set the
  893. * thread for sleeping on the callback RPC wait queue.
  894. */
  895. static bool nfsd41_cb_get_slot(struct nfsd4_callback *cb, struct rpc_task *task)
  896. {
  897. struct nfs4_client *clp = cb->cb_clp;
  898. if (!cb->cb_holds_slot &&
  899. test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
  900. rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
  901. /* Race breaker */
  902. if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
  903. dprintk("%s slot is busy\n", __func__);
  904. return false;
  905. }
  906. rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
  907. }
  908. cb->cb_holds_slot = true;
  909. return true;
  910. }
  911. static void nfsd41_cb_release_slot(struct nfsd4_callback *cb)
  912. {
  913. struct nfs4_client *clp = cb->cb_clp;
  914. if (cb->cb_holds_slot) {
  915. cb->cb_holds_slot = false;
  916. clear_bit(0, &clp->cl_cb_slot_busy);
  917. rpc_wake_up_next(&clp->cl_cb_waitq);
  918. }
  919. }
  920. static void nfsd41_destroy_cb(struct nfsd4_callback *cb)
  921. {
  922. struct nfs4_client *clp = cb->cb_clp;
  923. nfsd41_cb_release_slot(cb);
  924. if (cb->cb_ops && cb->cb_ops->release)
  925. cb->cb_ops->release(cb);
  926. nfsd41_cb_inflight_end(clp);
  927. }
  928. /*
  929. * TODO: cb_sequence should support referring call lists, cachethis, multiple
  930. * slots, and mark callback channel down on communication errors.
  931. */
  932. static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
  933. {
  934. struct nfsd4_callback *cb = calldata;
  935. struct nfs4_client *clp = cb->cb_clp;
  936. u32 minorversion = clp->cl_minorversion;
  937. /*
  938. * cb_seq_status is only set in decode_cb_sequence4res,
  939. * and so will remain 1 if an rpc level failure occurs.
  940. */
  941. cb->cb_seq_status = 1;
  942. cb->cb_status = 0;
  943. if (minorversion && !nfsd41_cb_get_slot(cb, task))
  944. return;
  945. rpc_call_start(task);
  946. }
  947. static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
  948. {
  949. struct nfs4_client *clp = cb->cb_clp;
  950. struct nfsd4_session *session = clp->cl_cb_session;
  951. bool ret = true;
  952. if (!clp->cl_minorversion) {
  953. /*
  954. * If the backchannel connection was shut down while this
  955. * task was queued, we need to resubmit it after setting up
  956. * a new backchannel connection.
  957. *
  958. * Note that if we lost our callback connection permanently
  959. * the submission code will error out, so we don't need to
  960. * handle that case here.
  961. */
  962. if (RPC_SIGNALLED(task))
  963. goto need_restart;
  964. return true;
  965. }
  966. if (!cb->cb_holds_slot)
  967. goto need_restart;
  968. switch (cb->cb_seq_status) {
  969. case 0:
  970. /*
  971. * No need for lock, access serialized in nfsd4_cb_prepare
  972. *
  973. * RFC5661 20.9.3
  974. * If CB_SEQUENCE returns an error, then the state of the slot
  975. * (sequence ID, cached reply) MUST NOT change.
  976. */
  977. ++session->se_cb_seq_nr;
  978. break;
  979. case -ESERVERFAULT:
  980. ++session->se_cb_seq_nr;
  981. fallthrough;
  982. case 1:
  983. case -NFS4ERR_BADSESSION:
  984. nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
  985. ret = false;
  986. break;
  987. case -NFS4ERR_DELAY:
  988. if (!rpc_restart_call(task))
  989. goto out;
  990. rpc_delay(task, 2 * HZ);
  991. return false;
  992. case -NFS4ERR_BADSLOT:
  993. goto retry_nowait;
  994. case -NFS4ERR_SEQ_MISORDERED:
  995. if (session->se_cb_seq_nr != 1) {
  996. session->se_cb_seq_nr = 1;
  997. goto retry_nowait;
  998. }
  999. break;
  1000. default:
  1001. nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
  1002. dprintk("%s: unprocessed error %d\n", __func__,
  1003. cb->cb_seq_status);
  1004. }
  1005. nfsd41_cb_release_slot(cb);
  1006. dprintk("%s: freed slot, new seqid=%d\n", __func__,
  1007. clp->cl_cb_session->se_cb_seq_nr);
  1008. if (RPC_SIGNALLED(task))
  1009. goto need_restart;
  1010. out:
  1011. return ret;
  1012. retry_nowait:
  1013. if (rpc_restart_call_prepare(task))
  1014. ret = false;
  1015. goto out;
  1016. need_restart:
  1017. if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
  1018. task->tk_status = 0;
  1019. cb->cb_need_restart = true;
  1020. }
  1021. return false;
  1022. }
  1023. static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
  1024. {
  1025. struct nfsd4_callback *cb = calldata;
  1026. struct nfs4_client *clp = cb->cb_clp;
  1027. trace_nfsd_cb_done(clp, task->tk_status);
  1028. if (!nfsd4_cb_sequence_done(task, cb))
  1029. return;
  1030. if (cb->cb_status) {
  1031. WARN_ON_ONCE(task->tk_status);
  1032. task->tk_status = cb->cb_status;
  1033. }
  1034. switch (cb->cb_ops->done(cb, task)) {
  1035. case 0:
  1036. task->tk_status = 0;
  1037. rpc_restart_call_prepare(task);
  1038. return;
  1039. case 1:
  1040. switch (task->tk_status) {
  1041. case -EIO:
  1042. case -ETIMEDOUT:
  1043. case -EACCES:
  1044. nfsd4_mark_cb_down(clp, task->tk_status);
  1045. }
  1046. break;
  1047. default:
  1048. BUG();
  1049. }
  1050. }
  1051. static void nfsd4_cb_release(void *calldata)
  1052. {
  1053. struct nfsd4_callback *cb = calldata;
  1054. if (cb->cb_need_restart)
  1055. nfsd4_queue_cb(cb);
  1056. else
  1057. nfsd41_destroy_cb(cb);
  1058. }
  1059. static const struct rpc_call_ops nfsd4_cb_ops = {
  1060. .rpc_call_prepare = nfsd4_cb_prepare,
  1061. .rpc_call_done = nfsd4_cb_done,
  1062. .rpc_release = nfsd4_cb_release,
  1063. };
  1064. int nfsd4_create_callback_queue(void)
  1065. {
  1066. callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
  1067. if (!callback_wq)
  1068. return -ENOMEM;
  1069. return 0;
  1070. }
  1071. void nfsd4_destroy_callback_queue(void)
  1072. {
  1073. destroy_workqueue(callback_wq);
  1074. }
  1075. /* must be called under the state lock */
  1076. void nfsd4_shutdown_callback(struct nfs4_client *clp)
  1077. {
  1078. set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
  1079. /*
  1080. * Note this won't actually result in a null callback;
  1081. * instead, nfsd4_run_cb_null() will detect the killed
  1082. * client, destroy the rpc client, and stop:
  1083. */
  1084. nfsd4_run_cb(&clp->cl_cb_null);
  1085. flush_workqueue(callback_wq);
  1086. nfsd41_cb_inflight_wait_complete(clp);
  1087. }
  1088. /* requires cl_lock: */
  1089. static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
  1090. {
  1091. struct nfsd4_session *s;
  1092. struct nfsd4_conn *c;
  1093. list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
  1094. list_for_each_entry(c, &s->se_conns, cn_persession) {
  1095. if (c->cn_flags & NFS4_CDFC4_BACK)
  1096. return c;
  1097. }
  1098. }
  1099. return NULL;
  1100. }
  1101. /*
  1102. * Note there isn't a lot of locking in this code; instead we depend on
  1103. * the fact that it is run from the callback_wq, which won't run two
  1104. * work items at once. So, for example, callback_wq handles all access
  1105. * of cl_cb_client and all calls to rpc_create or rpc_shutdown_client.
  1106. */
  1107. static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
  1108. {
  1109. struct nfs4_cb_conn conn;
  1110. struct nfs4_client *clp = cb->cb_clp;
  1111. struct nfsd4_session *ses = NULL;
  1112. struct nfsd4_conn *c;
  1113. int err;
  1114. /*
  1115. * This is either an update, or the client dying; in either case,
  1116. * kill the old client:
  1117. */
  1118. if (clp->cl_cb_client) {
  1119. trace_nfsd_cb_shutdown(clp);
  1120. rpc_shutdown_client(clp->cl_cb_client);
  1121. clp->cl_cb_client = NULL;
  1122. put_cred(clp->cl_cb_cred);
  1123. clp->cl_cb_cred = NULL;
  1124. }
  1125. if (clp->cl_cb_conn.cb_xprt) {
  1126. svc_xprt_put(clp->cl_cb_conn.cb_xprt);
  1127. clp->cl_cb_conn.cb_xprt = NULL;
  1128. }
  1129. if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
  1130. return;
  1131. spin_lock(&clp->cl_lock);
  1132. /*
  1133. * Only serialized callback code is allowed to clear these
  1134. * flags; main nfsd code can only set them:
  1135. */
  1136. BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
  1137. clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
  1138. memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
  1139. c = __nfsd4_find_backchannel(clp);
  1140. if (c) {
  1141. svc_xprt_get(c->cn_xprt);
  1142. conn.cb_xprt = c->cn_xprt;
  1143. ses = c->cn_session;
  1144. }
  1145. spin_unlock(&clp->cl_lock);
  1146. err = setup_callback_client(clp, &conn, ses);
  1147. if (err) {
  1148. nfsd4_mark_cb_down(clp, err);
  1149. if (c)
  1150. svc_xprt_put(c->cn_xprt);
  1151. return;
  1152. }
  1153. }
  1154. static void
  1155. nfsd4_run_cb_work(struct work_struct *work)
  1156. {
  1157. struct nfsd4_callback *cb =
  1158. container_of(work, struct nfsd4_callback, cb_work);
  1159. struct nfs4_client *clp = cb->cb_clp;
  1160. struct rpc_clnt *clnt;
  1161. int flags;
  1162. trace_nfsd_cb_work(clp, cb->cb_msg.rpc_proc->p_name);
  1163. if (cb->cb_need_restart) {
  1164. cb->cb_need_restart = false;
  1165. } else {
  1166. if (cb->cb_ops && cb->cb_ops->prepare)
  1167. cb->cb_ops->prepare(cb);
  1168. }
  1169. if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
  1170. nfsd4_process_cb_update(cb);
  1171. clnt = clp->cl_cb_client;
  1172. if (!clnt) {
  1173. /* Callback channel broken, or client killed; give up: */
  1174. nfsd41_destroy_cb(cb);
  1175. return;
  1176. }
  1177. /*
  1178. * Don't send probe messages for 4.1 or later.
  1179. */
  1180. if (!cb->cb_ops && clp->cl_minorversion) {
  1181. clp->cl_cb_state = NFSD4_CB_UP;
  1182. nfsd41_destroy_cb(cb);
  1183. return;
  1184. }
  1185. cb->cb_msg.rpc_cred = clp->cl_cb_cred;
  1186. flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN;
  1187. rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags,
  1188. cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);
  1189. }
  1190. void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
  1191. const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op)
  1192. {
  1193. cb->cb_clp = clp;
  1194. cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
  1195. cb->cb_msg.rpc_argp = cb;
  1196. cb->cb_msg.rpc_resp = cb;
  1197. cb->cb_ops = ops;
  1198. INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
  1199. cb->cb_seq_status = 1;
  1200. cb->cb_status = 0;
  1201. cb->cb_need_restart = false;
  1202. cb->cb_holds_slot = false;
  1203. }
  1204. void nfsd4_run_cb(struct nfsd4_callback *cb)
  1205. {
  1206. struct nfs4_client *clp = cb->cb_clp;
  1207. nfsd41_cb_inflight_begin(clp);
  1208. if (!nfsd4_queue_cb(cb))
  1209. nfsd41_cb_inflight_end(clp);
  1210. }