nfssvc.c (91d2e9b56cf5c80f9efc530d494968369a8a0e0d) nfssvc.c (3988a57885eeac05ef89f0ab4d7e47b52fbcf630)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Central processing for nfsd.
4 *
5 * Authors: Olaf Kirch (okir@monad.swb.de)
6 *
7 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
8 */

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341}
342
343static bool nfsd_needs_lockd(struct nfsd_net *nn)
344{
345 return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST);
346}
347
348/**
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Central processing for nfsd.
4 *
5 * Authors: Olaf Kirch (okir@monad.swb.de)
6 *
7 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
8 */

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341}
342
343static bool nfsd_needs_lockd(struct nfsd_net *nn)
344{
345 return nfsd_vers(nn, 2, NFSD_TEST) || nfsd_vers(nn, 3, NFSD_TEST);
346}
347
348/**
349 * nfsd_copy_boot_verifier - Atomically copy a write verifier
349 * nfsd_copy_write_verifier - Atomically copy a write verifier
350 * @verf: buffer in which to receive the verifier cookie
351 * @nn: NFS net namespace
352 *
353 * This function provides a wait-free mechanism for copying the
350 * @verf: buffer in which to receive the verifier cookie
351 * @nn: NFS net namespace
352 *
353 * This function provides a wait-free mechanism for copying the
354 * namespace's boot verifier without tearing it.
354 * namespace's write verifier without tearing it.
355 */
355 */
356void nfsd_copy_boot_verifier(__be32 verf[2], struct nfsd_net *nn)
356void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn)
357{
358 int seq = 0;
359
360 do {
361 read_seqbegin_or_lock(&nn->writeverf_lock, &seq);
362 memcpy(verf, nn->writeverf, sizeof(*verf));
363 } while (need_seqretry(&nn->writeverf_lock, seq));
364 done_seqretry(&nn->writeverf_lock, seq);
365}
366
357{
358 int seq = 0;
359
360 do {
361 read_seqbegin_or_lock(&nn->writeverf_lock, &seq);
362 memcpy(verf, nn->writeverf, sizeof(*verf));
363 } while (need_seqretry(&nn->writeverf_lock, seq));
364 done_seqretry(&nn->writeverf_lock, seq);
365}
366
367static void nfsd_reset_boot_verifier_locked(struct nfsd_net *nn)
367static void nfsd_reset_write_verifier_locked(struct nfsd_net *nn)
368{
369 struct timespec64 now;
370 u64 verf;
371
372 /*
373 * Because the time value is hashed, y2038 time_t overflow
374 * is irrelevant in this usage.
375 */
376 ktime_get_raw_ts64(&now);
377 verf = siphash_2u64(now.tv_sec, now.tv_nsec, &nn->siphash_key);
378 memcpy(nn->writeverf, &verf, sizeof(nn->writeverf));
379}
380
381/**
368{
369 struct timespec64 now;
370 u64 verf;
371
372 /*
373 * Because the time value is hashed, y2038 time_t overflow
374 * is irrelevant in this usage.
375 */
376 ktime_get_raw_ts64(&now);
377 verf = siphash_2u64(now.tv_sec, now.tv_nsec, &nn->siphash_key);
378 memcpy(nn->writeverf, &verf, sizeof(nn->writeverf));
379}
380
381/**
382 * nfsd_reset_boot_verifier - Generate a new boot verifier
382 * nfsd_reset_write_verifier - Generate a new write verifier
383 * @nn: NFS net namespace
384 *
385 * This function updates the ->writeverf field of @nn. This field
386 * contains an opaque cookie that, according to Section 18.32.3 of
387 * RFC 8881, "the client can use to determine whether a server has
388 * changed instance state (e.g., server restart) between a call to
389 * WRITE and a subsequent call to either WRITE or COMMIT. This
390 * cookie MUST be unchanged during a single instance of the NFSv4.1
391 * server and MUST be unique between instances of the NFSv4.1
392 * server."
393 */
383 * @nn: NFS net namespace
384 *
385 * This function updates the ->writeverf field of @nn. This field
386 * contains an opaque cookie that, according to Section 18.32.3 of
387 * RFC 8881, "the client can use to determine whether a server has
388 * changed instance state (e.g., server restart) between a call to
389 * WRITE and a subsequent call to either WRITE or COMMIT. This
390 * cookie MUST be unchanged during a single instance of the NFSv4.1
391 * server and MUST be unique between instances of the NFSv4.1
392 * server."
393 */
394void nfsd_reset_boot_verifier(struct nfsd_net *nn)
394void nfsd_reset_write_verifier(struct nfsd_net *nn)
395{
396 write_seqlock(&nn->writeverf_lock);
395{
396 write_seqlock(&nn->writeverf_lock);
397 nfsd_reset_boot_verifier_locked(nn);
397 nfsd_reset_write_verifier_locked(nn);
398 write_sequnlock(&nn->writeverf_lock);
399}
400
401static int nfsd_startup_net(struct net *net, const struct cred *cred)
402{
403 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
404 int ret;
405

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678 set_max_drc();
679 /* check if the notifier is already set */
680 if (atomic_inc_return(&nfsd_notifier_refcount) == 1) {
681 register_inetaddr_notifier(&nfsd_inetaddr_notifier);
682#if IS_ENABLED(CONFIG_IPV6)
683 register_inet6addr_notifier(&nfsd_inet6addr_notifier);
684#endif
685 }
398 write_sequnlock(&nn->writeverf_lock);
399}
400
401static int nfsd_startup_net(struct net *net, const struct cred *cred)
402{
403 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
404 int ret;
405

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678 set_max_drc();
679 /* check if the notifier is already set */
680 if (atomic_inc_return(&nfsd_notifier_refcount) == 1) {
681 register_inetaddr_notifier(&nfsd_inetaddr_notifier);
682#if IS_ENABLED(CONFIG_IPV6)
683 register_inet6addr_notifier(&nfsd_inet6addr_notifier);
684#endif
685 }
686 nfsd_reset_boot_verifier(nn);
686 nfsd_reset_write_verifier(nn);
687 return 0;
688}
689
690int nfsd_nrpools(struct net *net)
691{
692 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
693
694 if (nn->nfsd_serv == NULL)

--- 454 unchanged lines hidden --- 		687 return 0;
688}
689
690int nfsd_nrpools(struct net *net)
691{
692 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
693
694 if (nn->nfsd_serv == NULL)

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