1/* 2* Copyright (c) 2004 The Regents of the University of Michigan. 3* Copyright (c) 2012 Jeff Layton <jlayton@redhat.com> 4* All rights reserved. 5* 6* Andy Adamson <andros@citi.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*/ 34 35#include <crypto/hash.h> 36#include <linux/file.h> 37#include <linux/slab.h> 38#include <linux/namei.h> 39#include <linux/sched.h> 40#include <linux/fs.h> 41#include <linux/module.h> 42#include <net/net_namespace.h> 43#include <linux/sunrpc/rpc_pipe_fs.h> 44#include <linux/sunrpc/clnt.h> 45#include <linux/nfsd/cld.h> 46 47#include "nfsd.h" 48#include "state.h" 49#include "vfs.h" 50#include "netns.h" 51 52#define NFSDDBG_FACILITY NFSDDBG_PROC 53 54/* Declarations */ 55struct nfsd4_client_tracking_ops { 56 int (*init)(struct net *); 57 void (*exit)(struct net *); 58 void (*create)(struct nfs4_client *); 59 void (*remove)(struct nfs4_client *); 60 int (*check)(struct nfs4_client *); 61 void (*grace_done)(struct nfsd_net *); 62 uint8_t version; 63 size_t msglen; 64}; 65 66static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops; 67static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2; 68 69#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 70/* Globals */ 71static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; 72 73static int 74nfs4_save_creds(const struct cred **original_creds) 75{ 76 struct cred *new; 77 78 new = prepare_creds(); 79 if (!new) 80 return -ENOMEM; 81 82 new->fsuid = GLOBAL_ROOT_UID; 83 new->fsgid = GLOBAL_ROOT_GID; 84 *original_creds = override_creds(new); 85 put_cred(new); 86 return 0; 87} 88 89static void 90nfs4_reset_creds(const struct cred *original) 91{ 92 revert_creds(original); 93} 94 95static void 96md5_to_hex(char *out, char *md5) 97{ 98 int i; 99 100 for (i=0; i<16; i++) { 101 unsigned char c = md5[i]; 102 103 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); 104 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); 105 } 106 *out = '\0'; 107} 108 109static int 110nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) 111{ 112 struct xdr_netobj cksum; 113 struct crypto_shash *tfm; 114 int status; 115 116 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", 117 clname->len, clname->data); 118 tfm = crypto_alloc_shash("md5", 0, 0); 119 if (IS_ERR(tfm)) { 120 status = PTR_ERR(tfm); 121 goto out_no_tfm; 122 } 123 124 cksum.len = crypto_shash_digestsize(tfm); 125 cksum.data = kmalloc(cksum.len, GFP_KERNEL); 126 if (cksum.data == NULL) { 127 status = -ENOMEM; 128 goto out; 129 } 130 131 status = crypto_shash_tfm_digest(tfm, clname->data, clname->len, 132 cksum.data); 133 if (status) 134 goto out; 135 136 md5_to_hex(dname, cksum.data); 137 138 status = 0; 139out: 140 kfree(cksum.data); 141 crypto_free_shash(tfm); 142out_no_tfm: 143 return status; 144} 145 146/* 147 * If we had an error generating the recdir name for the legacy tracker 148 * then warn the admin. If the error doesn't appear to be transient, 149 * then disable recovery tracking. 150 */ 151static void 152legacy_recdir_name_error(struct nfs4_client *clp, int error) 153{ 154 printk(KERN_ERR "NFSD: unable to generate recoverydir " 155 "name (%d).\n", error); 156 157 /* 158 * if the algorithm just doesn't exist, then disable the recovery 159 * tracker altogether. The crypto libs will generally return this if 160 * FIPS is enabled as well. 161 */ 162 if (error == -ENOENT) { 163 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " 164 "Reboot recovery will not function correctly!\n"); 165 nfsd4_client_tracking_exit(clp->net); 166 } 167} 168 169static void 170__nfsd4_create_reclaim_record_grace(struct nfs4_client *clp, 171 const char *dname, int len, struct nfsd_net *nn) 172{ 173 struct xdr_netobj name; 174 struct xdr_netobj princhash = { .len = 0, .data = NULL }; 175 struct nfs4_client_reclaim *crp; 176 177 name.data = kmemdup(dname, len, GFP_KERNEL); 178 if (!name.data) { 179 dprintk("%s: failed to allocate memory for name.data!\n", 180 __func__); 181 return; 182 } 183 name.len = len; 184 crp = nfs4_client_to_reclaim(name, princhash, nn); 185 if (!crp) { 186 kfree(name.data); 187 return; 188 } 189 crp->cr_clp = clp; 190} 191 192static void 193nfsd4_create_clid_dir(struct nfs4_client *clp) 194{ 195 const struct cred *original_cred; 196 char dname[HEXDIR_LEN]; 197 struct dentry *dir, *dentry; 198 int status; 199 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 200 201 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 202 return; 203 if (!nn->rec_file) 204 return; 205 206 status = nfs4_make_rec_clidname(dname, &clp->cl_name); 207 if (status) 208 return legacy_recdir_name_error(clp, status); 209 210 status = nfs4_save_creds(&original_cred); 211 if (status < 0) 212 return; 213 214 status = mnt_want_write_file(nn->rec_file); 215 if (status) 216 goto out_creds; 217 218 dir = nn->rec_file->f_path.dentry; 219 /* lock the parent */ 220 inode_lock(d_inode(dir)); 221 222 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); 223 if (IS_ERR(dentry)) { 224 status = PTR_ERR(dentry); 225 goto out_unlock; 226 } 227 if (d_really_is_positive(dentry)) 228 /* 229 * In the 4.1 case, where we're called from 230 * reclaim_complete(), records from the previous reboot 231 * may still be left, so this is OK. 232 * 233 * In the 4.0 case, we should never get here; but we may 234 * as well be forgiving and just succeed silently. 235 */ 236 goto out_put; 237 status = vfs_mkdir(&nop_mnt_idmap, d_inode(dir), dentry, S_IRWXU); 238out_put: 239 dput(dentry); 240out_unlock: 241 inode_unlock(d_inode(dir)); 242 if (status == 0) { 243 if (nn->in_grace) 244 __nfsd4_create_reclaim_record_grace(clp, dname, 245 HEXDIR_LEN, nn); 246 vfs_fsync(nn->rec_file, 0); 247 } else { 248 printk(KERN_ERR "NFSD: failed to write recovery record" 249 " (err %d); please check that %s exists" 250 " and is writeable", status, 251 user_recovery_dirname); 252 } 253 mnt_drop_write_file(nn->rec_file); 254out_creds: 255 nfs4_reset_creds(original_cred); 256} 257 258typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); 259 260struct name_list { 261 char name[HEXDIR_LEN]; 262 struct list_head list; 263}; 264 265struct nfs4_dir_ctx { 266 struct dir_context ctx; 267 struct list_head names; 268}; 269 270static bool 271nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen, 272 loff_t offset, u64 ino, unsigned int d_type) 273{ 274 struct nfs4_dir_ctx *ctx = 275 container_of(__ctx, struct nfs4_dir_ctx, ctx); 276 struct name_list *entry; 277 278 if (namlen != HEXDIR_LEN - 1) 279 return true; 280 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); 281 if (entry == NULL) 282 return false; 283 memcpy(entry->name, name, HEXDIR_LEN - 1); 284 entry->name[HEXDIR_LEN - 1] = '\0'; 285 list_add(&entry->list, &ctx->names); 286 return true; 287} 288 289static int 290nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) 291{ 292 const struct cred *original_cred; 293 struct dentry *dir = nn->rec_file->f_path.dentry; 294 struct nfs4_dir_ctx ctx = { 295 .ctx.actor = nfsd4_build_namelist, 296 .names = LIST_HEAD_INIT(ctx.names) 297 }; 298 struct name_list *entry, *tmp; 299 int status; 300 301 status = nfs4_save_creds(&original_cred); 302 if (status < 0) 303 return status; 304 305 status = vfs_llseek(nn->rec_file, 0, SEEK_SET); 306 if (status < 0) { 307 nfs4_reset_creds(original_cred); 308 return status; 309 } 310 311 status = iterate_dir(nn->rec_file, &ctx.ctx); 312 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); 313 314 list_for_each_entry_safe(entry, tmp, &ctx.names, list) { 315 if (!status) { 316 struct dentry *dentry; 317 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); 318 if (IS_ERR(dentry)) { 319 status = PTR_ERR(dentry); 320 break; 321 } 322 status = f(dir, dentry, nn); 323 dput(dentry); 324 } 325 list_del(&entry->list); 326 kfree(entry); 327 } 328 inode_unlock(d_inode(dir)); 329 nfs4_reset_creds(original_cred); 330 331 list_for_each_entry_safe(entry, tmp, &ctx.names, list) { 332 dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name); 333 list_del(&entry->list); 334 kfree(entry); 335 } 336 return status; 337} 338 339static int 340nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) 341{ 342 struct dentry *dir, *dentry; 343 int status; 344 345 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); 346 347 dir = nn->rec_file->f_path.dentry; 348 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); 349 dentry = lookup_one_len(name, dir, namlen); 350 if (IS_ERR(dentry)) { 351 status = PTR_ERR(dentry); 352 goto out_unlock; 353 } 354 status = -ENOENT; 355 if (d_really_is_negative(dentry)) 356 goto out; 357 status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry); 358out: 359 dput(dentry); 360out_unlock: 361 inode_unlock(d_inode(dir)); 362 return status; 363} 364 365static void 366__nfsd4_remove_reclaim_record_grace(const char *dname, int len, 367 struct nfsd_net *nn) 368{ 369 struct xdr_netobj name; 370 struct nfs4_client_reclaim *crp; 371 372 name.data = kmemdup(dname, len, GFP_KERNEL); 373 if (!name.data) { 374 dprintk("%s: failed to allocate memory for name.data!\n", 375 __func__); 376 return; 377 } 378 name.len = len; 379 crp = nfsd4_find_reclaim_client(name, nn); 380 kfree(name.data); 381 if (crp) 382 nfs4_remove_reclaim_record(crp, nn); 383} 384 385static void 386nfsd4_remove_clid_dir(struct nfs4_client *clp) 387{ 388 const struct cred *original_cred; 389 char dname[HEXDIR_LEN]; 390 int status; 391 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 392 393 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 394 return; 395 396 status = nfs4_make_rec_clidname(dname, &clp->cl_name); 397 if (status) 398 return legacy_recdir_name_error(clp, status); 399 400 status = mnt_want_write_file(nn->rec_file); 401 if (status) 402 goto out; 403 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 404 405 status = nfs4_save_creds(&original_cred); 406 if (status < 0) 407 goto out_drop_write; 408 409 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); 410 nfs4_reset_creds(original_cred); 411 if (status == 0) { 412 vfs_fsync(nn->rec_file, 0); 413 if (nn->in_grace) 414 __nfsd4_remove_reclaim_record_grace(dname, 415 HEXDIR_LEN, nn); 416 } 417out_drop_write: 418 mnt_drop_write_file(nn->rec_file); 419out: 420 if (status) 421 printk("NFSD: Failed to remove expired client state directory" 422 " %.*s\n", HEXDIR_LEN, dname); 423} 424 425static int 426purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) 427{ 428 int status; 429 struct xdr_netobj name; 430 431 if (child->d_name.len != HEXDIR_LEN - 1) { 432 printk("%s: illegal name %pd in recovery directory\n", 433 __func__, child); 434 /* Keep trying; maybe the others are OK: */ 435 return 0; 436 } 437 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL); 438 if (!name.data) { 439 dprintk("%s: failed to allocate memory for name.data!\n", 440 __func__); 441 goto out; 442 } 443 name.len = HEXDIR_LEN; 444 if (nfs4_has_reclaimed_state(name, nn)) 445 goto out_free; 446 447 status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child); 448 if (status) 449 printk("failed to remove client recovery directory %pd\n", 450 child); 451out_free: 452 kfree(name.data); 453out: 454 /* Keep trying, success or failure: */ 455 return 0; 456} 457 458static void 459nfsd4_recdir_purge_old(struct nfsd_net *nn) 460{ 461 int status; 462 463 nn->in_grace = false; 464 if (!nn->rec_file) 465 return; 466 status = mnt_want_write_file(nn->rec_file); 467 if (status) 468 goto out; 469 status = nfsd4_list_rec_dir(purge_old, nn); 470 if (status == 0) 471 vfs_fsync(nn->rec_file, 0); 472 mnt_drop_write_file(nn->rec_file); 473out: 474 nfs4_release_reclaim(nn); 475 if (status) 476 printk("nfsd4: failed to purge old clients from recovery" 477 " directory %pD\n", nn->rec_file); 478} 479 480static int 481load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) 482{ 483 struct xdr_netobj name; 484 struct xdr_netobj princhash = { .len = 0, .data = NULL }; 485 486 if (child->d_name.len != HEXDIR_LEN - 1) { 487 printk("%s: illegal name %pd in recovery directory\n", 488 __func__, child); 489 /* Keep trying; maybe the others are OK: */ 490 return 0; 491 } 492 name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL); 493 if (!name.data) { 494 dprintk("%s: failed to allocate memory for name.data!\n", 495 __func__); 496 goto out; 497 } 498 name.len = HEXDIR_LEN; 499 if (!nfs4_client_to_reclaim(name, princhash, nn)) 500 kfree(name.data); 501out: 502 return 0; 503} 504 505static int 506nfsd4_recdir_load(struct net *net) { 507 int status; 508 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 509 510 if (!nn->rec_file) 511 return 0; 512 513 status = nfsd4_list_rec_dir(load_recdir, nn); 514 if (status) 515 printk("nfsd4: failed loading clients from recovery" 516 " directory %pD\n", nn->rec_file); 517 return status; 518} 519 520/* 521 * Hold reference to the recovery directory. 522 */ 523 524static int 525nfsd4_init_recdir(struct net *net) 526{ 527 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 528 const struct cred *original_cred; 529 int status; 530 531 printk("NFSD: Using %s as the NFSv4 state recovery directory\n", 532 user_recovery_dirname); 533 534 BUG_ON(nn->rec_file); 535 536 status = nfs4_save_creds(&original_cred); 537 if (status < 0) { 538 printk("NFSD: Unable to change credentials to find recovery" 539 " directory: error %d\n", 540 status); 541 return status; 542 } 543 544 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); 545 if (IS_ERR(nn->rec_file)) { 546 printk("NFSD: unable to find recovery directory %s\n", 547 user_recovery_dirname); 548 status = PTR_ERR(nn->rec_file); 549 nn->rec_file = NULL; 550 } 551 552 nfs4_reset_creds(original_cred); 553 if (!status) 554 nn->in_grace = true; 555 return status; 556} 557 558static void 559nfsd4_shutdown_recdir(struct net *net) 560{ 561 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 562 563 if (!nn->rec_file) 564 return; 565 fput(nn->rec_file); 566 nn->rec_file = NULL; 567} 568 569static int 570nfs4_legacy_state_init(struct net *net) 571{ 572 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 573 int i; 574 575 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE, 576 sizeof(struct list_head), 577 GFP_KERNEL); 578 if (!nn->reclaim_str_hashtbl) 579 return -ENOMEM; 580 581 for (i = 0; i < CLIENT_HASH_SIZE; i++) 582 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); 583 nn->reclaim_str_hashtbl_size = 0; 584 585 return 0; 586} 587 588static void 589nfs4_legacy_state_shutdown(struct net *net) 590{ 591 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 592 593 kfree(nn->reclaim_str_hashtbl); 594} 595 596static int 597nfsd4_load_reboot_recovery_data(struct net *net) 598{ 599 int status; 600 601 status = nfsd4_init_recdir(net); 602 if (status) 603 return status; 604 605 status = nfsd4_recdir_load(net); 606 if (status) 607 nfsd4_shutdown_recdir(net); 608 609 return status; 610} 611 612static int 613nfsd4_legacy_tracking_init(struct net *net) 614{ 615 int status; 616 617 /* XXX: The legacy code won't work in a container */ 618 if (net != &init_net) { 619 pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n"); 620 return -EINVAL; 621 } 622 623 status = nfs4_legacy_state_init(net); 624 if (status) 625 return status; 626 627 status = nfsd4_load_reboot_recovery_data(net); 628 if (status) 629 goto err; 630 pr_info("NFSD: Using legacy client tracking operations.\n"); 631 return 0; 632 633err: 634 nfs4_legacy_state_shutdown(net); 635 return status; 636} 637 638static void 639nfsd4_legacy_tracking_exit(struct net *net) 640{ 641 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 642 643 nfs4_release_reclaim(nn); 644 nfsd4_shutdown_recdir(net); 645 nfs4_legacy_state_shutdown(net); 646} 647 648/* 649 * Change the NFSv4 recovery directory to recdir. 650 */ 651int 652nfs4_reset_recoverydir(char *recdir) 653{ 654 int status; 655 struct path path; 656 657 status = kern_path(recdir, LOOKUP_FOLLOW, &path); 658 if (status) 659 return status; 660 status = -ENOTDIR; 661 if (d_is_dir(path.dentry)) { 662 strcpy(user_recovery_dirname, recdir); 663 status = 0; 664 } 665 path_put(&path); 666 return status; 667} 668 669char * 670nfs4_recoverydir(void) 671{ 672 return user_recovery_dirname; 673} 674 675static int 676nfsd4_check_legacy_client(struct nfs4_client *clp) 677{ 678 int status; 679 char dname[HEXDIR_LEN]; 680 struct nfs4_client_reclaim *crp; 681 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 682 struct xdr_netobj name; 683 684 /* did we already find that this client is stable? */ 685 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 686 return 0; 687 688 status = nfs4_make_rec_clidname(dname, &clp->cl_name); 689 if (status) { 690 legacy_recdir_name_error(clp, status); 691 return status; 692 } 693 694 /* look for it in the reclaim hashtable otherwise */ 695 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); 696 if (!name.data) { 697 dprintk("%s: failed to allocate memory for name.data!\n", 698 __func__); 699 goto out_enoent; 700 } 701 name.len = HEXDIR_LEN; 702 crp = nfsd4_find_reclaim_client(name, nn); 703 kfree(name.data); 704 if (crp) { 705 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 706 crp->cr_clp = clp; 707 return 0; 708 } 709 710out_enoent: 711 return -ENOENT; 712} 713 714static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { 715 .init = nfsd4_legacy_tracking_init, 716 .exit = nfsd4_legacy_tracking_exit, 717 .create = nfsd4_create_clid_dir, 718 .remove = nfsd4_remove_clid_dir, 719 .check = nfsd4_check_legacy_client, 720 .grace_done = nfsd4_recdir_purge_old, 721 .version = 1, 722 .msglen = 0, 723}; 724#endif /* CONFIG_NFSD_LEGACY_CLIENT_TRACKING */ 725 726/* Globals */ 727#define NFSD_PIPE_DIR "nfsd" 728#define NFSD_CLD_PIPE "cld" 729 730/* per-net-ns structure for holding cld upcall info */ 731struct cld_net { 732 struct rpc_pipe *cn_pipe; 733 spinlock_t cn_lock; 734 struct list_head cn_list; 735 unsigned int cn_xid; 736 struct crypto_shash *cn_tfm; 737#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 738 bool cn_has_legacy; 739#endif 740}; 741 742struct cld_upcall { 743 struct list_head cu_list; 744 struct cld_net *cu_net; 745 struct completion cu_done; 746 union { 747 struct cld_msg_hdr cu_hdr; 748 struct cld_msg cu_msg; 749 struct cld_msg_v2 cu_msg_v2; 750 } cu_u; 751}; 752 753static int 754__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn) 755{ 756 int ret; 757 struct rpc_pipe_msg msg; 758 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u); 759 760 memset(&msg, 0, sizeof(msg)); 761 msg.data = cmsg; 762 msg.len = nn->client_tracking_ops->msglen; 763 764 ret = rpc_queue_upcall(pipe, &msg); 765 if (ret < 0) { 766 goto out; 767 } 768 769 wait_for_completion(&cup->cu_done); 770 771 if (msg.errno < 0) 772 ret = msg.errno; 773out: 774 return ret; 775} 776 777static int 778cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn) 779{ 780 int ret; 781 782 /* 783 * -EAGAIN occurs when pipe is closed and reopened while there are 784 * upcalls queued. 785 */ 786 do { 787 ret = __cld_pipe_upcall(pipe, cmsg, nn); 788 } while (ret == -EAGAIN); 789 790 return ret; 791} 792 793static ssize_t 794__cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg, 795 struct nfsd_net *nn) 796{ 797 uint8_t cmd, princhashlen; 798 struct xdr_netobj name, princhash = { .len = 0, .data = NULL }; 799 uint16_t namelen; 800 801 if (get_user(cmd, &cmsg->cm_cmd)) { 802 dprintk("%s: error when copying cmd from userspace", __func__); 803 return -EFAULT; 804 } 805 if (cmd == Cld_GraceStart) { 806 if (nn->client_tracking_ops->version >= 2) { 807 const struct cld_clntinfo __user *ci; 808 809 ci = &cmsg->cm_u.cm_clntinfo; 810 if (get_user(namelen, &ci->cc_name.cn_len)) 811 return -EFAULT; 812 name.data = memdup_user(&ci->cc_name.cn_id, namelen); 813 if (IS_ERR(name.data)) 814 return PTR_ERR(name.data); 815 name.len = namelen; 816 get_user(princhashlen, &ci->cc_princhash.cp_len); 817 if (princhashlen > 0) { 818 princhash.data = memdup_user( 819 &ci->cc_princhash.cp_data, 820 princhashlen); 821 if (IS_ERR(princhash.data)) { 822 kfree(name.data); 823 return PTR_ERR(princhash.data); 824 } 825 princhash.len = princhashlen; 826 } else 827 princhash.len = 0; 828 } else { 829 const struct cld_name __user *cnm; 830 831 cnm = &cmsg->cm_u.cm_name; 832 if (get_user(namelen, &cnm->cn_len)) 833 return -EFAULT; 834 name.data = memdup_user(&cnm->cn_id, namelen); 835 if (IS_ERR(name.data)) 836 return PTR_ERR(name.data); 837 name.len = namelen; 838 } 839#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 840 if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) { 841 struct cld_net *cn = nn->cld_net; 842 843 name.len = name.len - 5; 844 memmove(name.data, name.data + 5, name.len); 845 cn->cn_has_legacy = true; 846 } 847#endif 848 if (!nfs4_client_to_reclaim(name, princhash, nn)) { 849 kfree(name.data); 850 kfree(princhash.data); 851 return -EFAULT; 852 } 853 return nn->client_tracking_ops->msglen; 854 } 855 return -EFAULT; 856} 857 858static ssize_t 859cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 860{ 861 struct cld_upcall *tmp, *cup; 862 struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src; 863 struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src; 864 uint32_t xid; 865 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, 866 nfsd_net_id); 867 struct cld_net *cn = nn->cld_net; 868 int16_t status; 869 870 if (mlen != nn->client_tracking_ops->msglen) { 871 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, 872 nn->client_tracking_ops->msglen); 873 return -EINVAL; 874 } 875 876 /* copy just the xid so we can try to find that */ 877 if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) { 878 dprintk("%s: error when copying xid from userspace", __func__); 879 return -EFAULT; 880 } 881 882 /* 883 * copy the status so we know whether to remove the upcall from the 884 * list (for -EINPROGRESS, we just want to make sure the xid is 885 * valid, not remove the upcall from the list) 886 */ 887 if (get_user(status, &hdr->cm_status)) { 888 dprintk("%s: error when copying status from userspace", __func__); 889 return -EFAULT; 890 } 891 892 /* walk the list and find corresponding xid */ 893 cup = NULL; 894 spin_lock(&cn->cn_lock); 895 list_for_each_entry(tmp, &cn->cn_list, cu_list) { 896 if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) { 897 cup = tmp; 898 if (status != -EINPROGRESS) 899 list_del_init(&cup->cu_list); 900 break; 901 } 902 } 903 spin_unlock(&cn->cn_lock); 904 905 /* couldn't find upcall? */ 906 if (!cup) { 907 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); 908 return -EINVAL; 909 } 910 911 if (status == -EINPROGRESS) 912 return __cld_pipe_inprogress_downcall(cmsg, nn); 913 914 if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0) 915 return -EFAULT; 916 917 complete(&cup->cu_done); 918 return mlen; 919} 920 921static void 922cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) 923{ 924 struct cld_msg *cmsg = msg->data; 925 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, 926 cu_u.cu_msg); 927 928 /* errno >= 0 means we got a downcall */ 929 if (msg->errno >= 0) 930 return; 931 932 complete(&cup->cu_done); 933} 934 935static const struct rpc_pipe_ops cld_upcall_ops = { 936 .upcall = rpc_pipe_generic_upcall, 937 .downcall = cld_pipe_downcall, 938 .destroy_msg = cld_pipe_destroy_msg, 939}; 940 941static struct dentry * 942nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) 943{ 944 struct dentry *dir, *dentry; 945 946 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); 947 if (dir == NULL) 948 return ERR_PTR(-ENOENT); 949 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); 950 dput(dir); 951 return dentry; 952} 953 954static void 955nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) 956{ 957 if (pipe->dentry) 958 rpc_unlink(pipe->dentry); 959} 960 961static struct dentry * 962nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) 963{ 964 struct super_block *sb; 965 struct dentry *dentry; 966 967 sb = rpc_get_sb_net(net); 968 if (!sb) 969 return NULL; 970 dentry = nfsd4_cld_register_sb(sb, pipe); 971 rpc_put_sb_net(net); 972 return dentry; 973} 974 975static void 976nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) 977{ 978 struct super_block *sb; 979 980 sb = rpc_get_sb_net(net); 981 if (sb) { 982 nfsd4_cld_unregister_sb(pipe); 983 rpc_put_sb_net(net); 984 } 985} 986 987/* Initialize rpc_pipefs pipe for communication with client tracking daemon */ 988static int 989__nfsd4_init_cld_pipe(struct net *net) 990{ 991 int ret; 992 struct dentry *dentry; 993 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 994 struct cld_net *cn; 995 996 if (nn->cld_net) 997 return 0; 998 999 cn = kzalloc(sizeof(*cn), GFP_KERNEL); 1000 if (!cn) { 1001 ret = -ENOMEM; 1002 goto err; 1003 } 1004 1005 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); 1006 if (IS_ERR(cn->cn_pipe)) { 1007 ret = PTR_ERR(cn->cn_pipe); 1008 goto err; 1009 } 1010 spin_lock_init(&cn->cn_lock); 1011 INIT_LIST_HEAD(&cn->cn_list); 1012 1013 dentry = nfsd4_cld_register_net(net, cn->cn_pipe); 1014 if (IS_ERR(dentry)) { 1015 ret = PTR_ERR(dentry); 1016 goto err_destroy_data; 1017 } 1018 1019 cn->cn_pipe->dentry = dentry; 1020#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 1021 cn->cn_has_legacy = false; 1022#endif 1023 nn->cld_net = cn; 1024 return 0; 1025 1026err_destroy_data: 1027 rpc_destroy_pipe_data(cn->cn_pipe); 1028err: 1029 kfree(cn); 1030 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", 1031 ret); 1032 return ret; 1033} 1034 1035static int 1036nfsd4_init_cld_pipe(struct net *net) 1037{ 1038 int status; 1039 1040 status = __nfsd4_init_cld_pipe(net); 1041 if (!status) 1042 pr_info("NFSD: Using old nfsdcld client tracking operations.\n"); 1043 return status; 1044} 1045 1046static void 1047nfsd4_remove_cld_pipe(struct net *net) 1048{ 1049 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1050 struct cld_net *cn = nn->cld_net; 1051 1052 nfsd4_cld_unregister_net(net, cn->cn_pipe); 1053 rpc_destroy_pipe_data(cn->cn_pipe); 1054 if (cn->cn_tfm) 1055 crypto_free_shash(cn->cn_tfm); 1056 kfree(nn->cld_net); 1057 nn->cld_net = NULL; 1058} 1059 1060static struct cld_upcall * 1061alloc_cld_upcall(struct nfsd_net *nn) 1062{ 1063 struct cld_upcall *new, *tmp; 1064 struct cld_net *cn = nn->cld_net; 1065 1066 new = kzalloc(sizeof(*new), GFP_KERNEL); 1067 if (!new) 1068 return new; 1069 1070 /* FIXME: hard cap on number in flight? */ 1071restart_search: 1072 spin_lock(&cn->cn_lock); 1073 list_for_each_entry(tmp, &cn->cn_list, cu_list) { 1074 if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) { 1075 cn->cn_xid++; 1076 spin_unlock(&cn->cn_lock); 1077 goto restart_search; 1078 } 1079 } 1080 init_completion(&new->cu_done); 1081 new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version; 1082 put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid); 1083 new->cu_net = cn; 1084 list_add(&new->cu_list, &cn->cn_list); 1085 spin_unlock(&cn->cn_lock); 1086 1087 dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid); 1088 1089 return new; 1090} 1091 1092static void 1093free_cld_upcall(struct cld_upcall *victim) 1094{ 1095 struct cld_net *cn = victim->cu_net; 1096 1097 spin_lock(&cn->cn_lock); 1098 list_del(&victim->cu_list); 1099 spin_unlock(&cn->cn_lock); 1100 kfree(victim); 1101} 1102 1103/* Ask daemon to create a new record */ 1104static void 1105nfsd4_cld_create(struct nfs4_client *clp) 1106{ 1107 int ret; 1108 struct cld_upcall *cup; 1109 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1110 struct cld_net *cn = nn->cld_net; 1111 1112 /* Don't upcall if it's already stored */ 1113 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1114 return; 1115 1116 cup = alloc_cld_upcall(nn); 1117 if (!cup) { 1118 ret = -ENOMEM; 1119 goto out_err; 1120 } 1121 1122 cup->cu_u.cu_msg.cm_cmd = Cld_Create; 1123 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; 1124 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, 1125 clp->cl_name.len); 1126 1127 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1128 if (!ret) { 1129 ret = cup->cu_u.cu_msg.cm_status; 1130 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1131 } 1132 1133 free_cld_upcall(cup); 1134out_err: 1135 if (ret) 1136 printk(KERN_ERR "NFSD: Unable to create client " 1137 "record on stable storage: %d\n", ret); 1138} 1139 1140/* Ask daemon to create a new record */ 1141static void 1142nfsd4_cld_create_v2(struct nfs4_client *clp) 1143{ 1144 int ret; 1145 struct cld_upcall *cup; 1146 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1147 struct cld_net *cn = nn->cld_net; 1148 struct cld_msg_v2 *cmsg; 1149 struct crypto_shash *tfm = cn->cn_tfm; 1150 struct xdr_netobj cksum; 1151 char *principal = NULL; 1152 1153 /* Don't upcall if it's already stored */ 1154 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1155 return; 1156 1157 cup = alloc_cld_upcall(nn); 1158 if (!cup) { 1159 ret = -ENOMEM; 1160 goto out_err; 1161 } 1162 1163 cmsg = &cup->cu_u.cu_msg_v2; 1164 cmsg->cm_cmd = Cld_Create; 1165 cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len; 1166 memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data, 1167 clp->cl_name.len); 1168 if (clp->cl_cred.cr_raw_principal) 1169 principal = clp->cl_cred.cr_raw_principal; 1170 else if (clp->cl_cred.cr_principal) 1171 principal = clp->cl_cred.cr_principal; 1172 if (principal) { 1173 cksum.len = crypto_shash_digestsize(tfm); 1174 cksum.data = kmalloc(cksum.len, GFP_KERNEL); 1175 if (cksum.data == NULL) { 1176 ret = -ENOMEM; 1177 goto out; 1178 } 1179 ret = crypto_shash_tfm_digest(tfm, principal, strlen(principal), 1180 cksum.data); 1181 if (ret) { 1182 kfree(cksum.data); 1183 goto out; 1184 } 1185 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len; 1186 memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data, 1187 cksum.data, cksum.len); 1188 kfree(cksum.data); 1189 } else 1190 cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0; 1191 1192 ret = cld_pipe_upcall(cn->cn_pipe, cmsg, nn); 1193 if (!ret) { 1194 ret = cmsg->cm_status; 1195 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1196 } 1197 1198out: 1199 free_cld_upcall(cup); 1200out_err: 1201 if (ret) 1202 pr_err("NFSD: Unable to create client record on stable storage: %d\n", 1203 ret); 1204} 1205 1206/* Ask daemon to create a new record */ 1207static void 1208nfsd4_cld_remove(struct nfs4_client *clp) 1209{ 1210 int ret; 1211 struct cld_upcall *cup; 1212 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1213 struct cld_net *cn = nn->cld_net; 1214 1215 /* Don't upcall if it's already removed */ 1216 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1217 return; 1218 1219 cup = alloc_cld_upcall(nn); 1220 if (!cup) { 1221 ret = -ENOMEM; 1222 goto out_err; 1223 } 1224 1225 cup->cu_u.cu_msg.cm_cmd = Cld_Remove; 1226 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; 1227 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, 1228 clp->cl_name.len); 1229 1230 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1231 if (!ret) { 1232 ret = cup->cu_u.cu_msg.cm_status; 1233 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1234 } 1235 1236 free_cld_upcall(cup); 1237out_err: 1238 if (ret) 1239 printk(KERN_ERR "NFSD: Unable to remove client " 1240 "record from stable storage: %d\n", ret); 1241} 1242 1243/* 1244 * For older nfsdcld's that do not allow us to "slurp" the clients 1245 * from the tracking database during startup. 1246 * 1247 * Check for presence of a record, and update its timestamp 1248 */ 1249static int 1250nfsd4_cld_check_v0(struct nfs4_client *clp) 1251{ 1252 int ret; 1253 struct cld_upcall *cup; 1254 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1255 struct cld_net *cn = nn->cld_net; 1256 1257 /* Don't upcall if one was already stored during this grace pd */ 1258 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1259 return 0; 1260 1261 cup = alloc_cld_upcall(nn); 1262 if (!cup) { 1263 printk(KERN_ERR "NFSD: Unable to check client record on " 1264 "stable storage: %d\n", -ENOMEM); 1265 return -ENOMEM; 1266 } 1267 1268 cup->cu_u.cu_msg.cm_cmd = Cld_Check; 1269 cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; 1270 memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, 1271 clp->cl_name.len); 1272 1273 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1274 if (!ret) { 1275 ret = cup->cu_u.cu_msg.cm_status; 1276 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1277 } 1278 1279 free_cld_upcall(cup); 1280 return ret; 1281} 1282 1283/* 1284 * For newer nfsdcld's that allow us to "slurp" the clients 1285 * from the tracking database during startup. 1286 * 1287 * Check for presence of a record in the reclaim_str_hashtbl 1288 */ 1289static int 1290nfsd4_cld_check(struct nfs4_client *clp) 1291{ 1292 struct nfs4_client_reclaim *crp; 1293 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1294 1295 /* did we already find that this client is stable? */ 1296 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1297 return 0; 1298 1299 /* look for it in the reclaim hashtable otherwise */ 1300 crp = nfsd4_find_reclaim_client(clp->cl_name, nn); 1301 if (crp) 1302 goto found; 1303 1304#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 1305 if (nn->cld_net->cn_has_legacy) { 1306 int status; 1307 char dname[HEXDIR_LEN]; 1308 struct xdr_netobj name; 1309 1310 status = nfs4_make_rec_clidname(dname, &clp->cl_name); 1311 if (status) 1312 return -ENOENT; 1313 1314 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); 1315 if (!name.data) { 1316 dprintk("%s: failed to allocate memory for name.data!\n", 1317 __func__); 1318 return -ENOENT; 1319 } 1320 name.len = HEXDIR_LEN; 1321 crp = nfsd4_find_reclaim_client(name, nn); 1322 kfree(name.data); 1323 if (crp) 1324 goto found; 1325 1326 } 1327#endif 1328 return -ENOENT; 1329found: 1330 crp->cr_clp = clp; 1331 return 0; 1332} 1333 1334static int 1335nfsd4_cld_check_v2(struct nfs4_client *clp) 1336{ 1337 struct nfs4_client_reclaim *crp; 1338 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1339 struct cld_net *cn = nn->cld_net; 1340 int status; 1341 struct crypto_shash *tfm = cn->cn_tfm; 1342 struct xdr_netobj cksum; 1343 char *principal = NULL; 1344 1345 /* did we already find that this client is stable? */ 1346 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1347 return 0; 1348 1349 /* look for it in the reclaim hashtable otherwise */ 1350 crp = nfsd4_find_reclaim_client(clp->cl_name, nn); 1351 if (crp) 1352 goto found; 1353 1354#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 1355 if (cn->cn_has_legacy) { 1356 struct xdr_netobj name; 1357 char dname[HEXDIR_LEN]; 1358 1359 status = nfs4_make_rec_clidname(dname, &clp->cl_name); 1360 if (status) 1361 return -ENOENT; 1362 1363 name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); 1364 if (!name.data) { 1365 dprintk("%s: failed to allocate memory for name.data\n", 1366 __func__); 1367 return -ENOENT; 1368 } 1369 name.len = HEXDIR_LEN; 1370 crp = nfsd4_find_reclaim_client(name, nn); 1371 kfree(name.data); 1372 if (crp) 1373 goto found; 1374 1375 } 1376#endif 1377 return -ENOENT; 1378found: 1379 if (crp->cr_princhash.len) { 1380 if (clp->cl_cred.cr_raw_principal) 1381 principal = clp->cl_cred.cr_raw_principal; 1382 else if (clp->cl_cred.cr_principal) 1383 principal = clp->cl_cred.cr_principal; 1384 if (principal == NULL) 1385 return -ENOENT; 1386 cksum.len = crypto_shash_digestsize(tfm); 1387 cksum.data = kmalloc(cksum.len, GFP_KERNEL); 1388 if (cksum.data == NULL) 1389 return -ENOENT; 1390 status = crypto_shash_tfm_digest(tfm, principal, 1391 strlen(principal), cksum.data); 1392 if (status) { 1393 kfree(cksum.data); 1394 return -ENOENT; 1395 } 1396 if (memcmp(crp->cr_princhash.data, cksum.data, 1397 crp->cr_princhash.len)) { 1398 kfree(cksum.data); 1399 return -ENOENT; 1400 } 1401 kfree(cksum.data); 1402 } 1403 crp->cr_clp = clp; 1404 return 0; 1405} 1406 1407static int 1408nfsd4_cld_grace_start(struct nfsd_net *nn) 1409{ 1410 int ret; 1411 struct cld_upcall *cup; 1412 struct cld_net *cn = nn->cld_net; 1413 1414 cup = alloc_cld_upcall(nn); 1415 if (!cup) { 1416 ret = -ENOMEM; 1417 goto out_err; 1418 } 1419 1420 cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart; 1421 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1422 if (!ret) 1423 ret = cup->cu_u.cu_msg.cm_status; 1424 1425 free_cld_upcall(cup); 1426out_err: 1427 if (ret) 1428 dprintk("%s: Unable to get clients from userspace: %d\n", 1429 __func__, ret); 1430 return ret; 1431} 1432 1433/* For older nfsdcld's that need cm_gracetime */ 1434static void 1435nfsd4_cld_grace_done_v0(struct nfsd_net *nn) 1436{ 1437 int ret; 1438 struct cld_upcall *cup; 1439 struct cld_net *cn = nn->cld_net; 1440 1441 cup = alloc_cld_upcall(nn); 1442 if (!cup) { 1443 ret = -ENOMEM; 1444 goto out_err; 1445 } 1446 1447 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone; 1448 cup->cu_u.cu_msg.cm_u.cm_gracetime = nn->boot_time; 1449 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1450 if (!ret) 1451 ret = cup->cu_u.cu_msg.cm_status; 1452 1453 free_cld_upcall(cup); 1454out_err: 1455 if (ret) 1456 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); 1457} 1458 1459/* 1460 * For newer nfsdcld's that do not need cm_gracetime. We also need to call 1461 * nfs4_release_reclaim() to clear out the reclaim_str_hashtbl. 1462 */ 1463static void 1464nfsd4_cld_grace_done(struct nfsd_net *nn) 1465{ 1466 int ret; 1467 struct cld_upcall *cup; 1468 struct cld_net *cn = nn->cld_net; 1469 1470 cup = alloc_cld_upcall(nn); 1471 if (!cup) { 1472 ret = -ENOMEM; 1473 goto out_err; 1474 } 1475 1476 cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone; 1477 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1478 if (!ret) 1479 ret = cup->cu_u.cu_msg.cm_status; 1480 1481 free_cld_upcall(cup); 1482out_err: 1483 nfs4_release_reclaim(nn); 1484 if (ret) 1485 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); 1486} 1487 1488static int 1489nfs4_cld_state_init(struct net *net) 1490{ 1491 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1492 int i; 1493 1494 nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE, 1495 sizeof(struct list_head), 1496 GFP_KERNEL); 1497 if (!nn->reclaim_str_hashtbl) 1498 return -ENOMEM; 1499 1500 for (i = 0; i < CLIENT_HASH_SIZE; i++) 1501 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); 1502 nn->reclaim_str_hashtbl_size = 0; 1503 nn->track_reclaim_completes = true; 1504 atomic_set(&nn->nr_reclaim_complete, 0); 1505 1506 return 0; 1507} 1508 1509static void 1510nfs4_cld_state_shutdown(struct net *net) 1511{ 1512 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1513 1514 nn->track_reclaim_completes = false; 1515 kfree(nn->reclaim_str_hashtbl); 1516} 1517 1518static bool 1519cld_running(struct nfsd_net *nn) 1520{ 1521 struct cld_net *cn = nn->cld_net; 1522 struct rpc_pipe *pipe = cn->cn_pipe; 1523 1524 return pipe->nreaders || pipe->nwriters; 1525} 1526 1527static int 1528nfsd4_cld_get_version(struct nfsd_net *nn) 1529{ 1530 int ret = 0; 1531 struct cld_upcall *cup; 1532 struct cld_net *cn = nn->cld_net; 1533 uint8_t version; 1534 1535 cup = alloc_cld_upcall(nn); 1536 if (!cup) { 1537 ret = -ENOMEM; 1538 goto out_err; 1539 } 1540 cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion; 1541 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); 1542 if (!ret) { 1543 ret = cup->cu_u.cu_msg.cm_status; 1544 if (ret) 1545 goto out_free; 1546 version = cup->cu_u.cu_msg.cm_u.cm_version; 1547 dprintk("%s: userspace returned version %u\n", 1548 __func__, version); 1549 if (version < 1) 1550 version = 1; 1551 else if (version > CLD_UPCALL_VERSION) 1552 version = CLD_UPCALL_VERSION; 1553 1554 switch (version) { 1555 case 1: 1556 nn->client_tracking_ops = &nfsd4_cld_tracking_ops; 1557 break; 1558 case 2: 1559 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2; 1560 break; 1561 default: 1562 break; 1563 } 1564 } 1565out_free: 1566 free_cld_upcall(cup); 1567out_err: 1568 if (ret) 1569 dprintk("%s: Unable to get version from userspace: %d\n", 1570 __func__, ret); 1571 return ret; 1572} 1573 1574static int 1575nfsd4_cld_tracking_init(struct net *net) 1576{ 1577 int status; 1578 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1579 bool running; 1580 int retries = 10; 1581 struct crypto_shash *tfm; 1582 1583 status = nfs4_cld_state_init(net); 1584 if (status) 1585 return status; 1586 1587 status = __nfsd4_init_cld_pipe(net); 1588 if (status) 1589 goto err_shutdown; 1590 1591 /* 1592 * rpc pipe upcalls take 30 seconds to time out, so we don't want to 1593 * queue an upcall unless we know that nfsdcld is running (because we 1594 * want this to fail fast so that nfsd4_client_tracking_init() can try 1595 * the next client tracking method). nfsdcld should already be running 1596 * before nfsd is started, so the wait here is for nfsdcld to open the 1597 * pipefs file we just created. 1598 */ 1599 while (!(running = cld_running(nn)) && retries--) 1600 msleep(100); 1601 1602 if (!running) { 1603 status = -ETIMEDOUT; 1604 goto err_remove; 1605 } 1606 tfm = crypto_alloc_shash("sha256", 0, 0); 1607 if (IS_ERR(tfm)) { 1608 status = PTR_ERR(tfm); 1609 goto err_remove; 1610 } 1611 nn->cld_net->cn_tfm = tfm; 1612 1613 status = nfsd4_cld_get_version(nn); 1614 if (status == -EOPNOTSUPP) 1615 pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n"); 1616 1617 status = nfsd4_cld_grace_start(nn); 1618 if (status) { 1619 if (status == -EOPNOTSUPP) 1620 pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n"); 1621 nfs4_release_reclaim(nn); 1622 goto err_remove; 1623 } else 1624 pr_info("NFSD: Using nfsdcld client tracking operations.\n"); 1625 return 0; 1626 1627err_remove: 1628 nfsd4_remove_cld_pipe(net); 1629err_shutdown: 1630 nfs4_cld_state_shutdown(net); 1631 return status; 1632} 1633 1634static void 1635nfsd4_cld_tracking_exit(struct net *net) 1636{ 1637 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1638 1639 nfs4_release_reclaim(nn); 1640 nfsd4_remove_cld_pipe(net); 1641 nfs4_cld_state_shutdown(net); 1642} 1643 1644/* For older nfsdcld's */ 1645static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = { 1646 .init = nfsd4_init_cld_pipe, 1647 .exit = nfsd4_remove_cld_pipe, 1648 .create = nfsd4_cld_create, 1649 .remove = nfsd4_cld_remove, 1650 .check = nfsd4_cld_check_v0, 1651 .grace_done = nfsd4_cld_grace_done_v0, 1652 .version = 1, 1653 .msglen = sizeof(struct cld_msg), 1654}; 1655 1656/* For newer nfsdcld's */ 1657static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { 1658 .init = nfsd4_cld_tracking_init, 1659 .exit = nfsd4_cld_tracking_exit, 1660 .create = nfsd4_cld_create, 1661 .remove = nfsd4_cld_remove, 1662 .check = nfsd4_cld_check, 1663 .grace_done = nfsd4_cld_grace_done, 1664 .version = 1, 1665 .msglen = sizeof(struct cld_msg), 1666}; 1667 1668/* v2 create/check ops include the principal, if available */ 1669static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = { 1670 .init = nfsd4_cld_tracking_init, 1671 .exit = nfsd4_cld_tracking_exit, 1672 .create = nfsd4_cld_create_v2, 1673 .remove = nfsd4_cld_remove, 1674 .check = nfsd4_cld_check_v2, 1675 .grace_done = nfsd4_cld_grace_done, 1676 .version = 2, 1677 .msglen = sizeof(struct cld_msg_v2), 1678}; 1679 1680#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING 1681/* upcall via usermodehelper */ 1682static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; 1683module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), 1684 S_IRUGO|S_IWUSR); 1685MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); 1686 1687static bool cltrack_legacy_disable; 1688module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); 1689MODULE_PARM_DESC(cltrack_legacy_disable, 1690 "Disable legacy recoverydir conversion. Default: false"); 1691 1692#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" 1693#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" 1694#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION=" 1695#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START=" 1696 1697static char * 1698nfsd4_cltrack_legacy_topdir(void) 1699{ 1700 int copied; 1701 size_t len; 1702 char *result; 1703 1704 if (cltrack_legacy_disable) 1705 return NULL; 1706 1707 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + 1708 strlen(nfs4_recoverydir()) + 1; 1709 1710 result = kmalloc(len, GFP_KERNEL); 1711 if (!result) 1712 return result; 1713 1714 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", 1715 nfs4_recoverydir()); 1716 if (copied >= len) { 1717 /* just return nothing if output was truncated */ 1718 kfree(result); 1719 return NULL; 1720 } 1721 1722 return result; 1723} 1724 1725static char * 1726nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) 1727{ 1728 int copied; 1729 size_t len; 1730 char *result; 1731 1732 if (cltrack_legacy_disable) 1733 return NULL; 1734 1735 /* +1 is for '/' between "topdir" and "recdir" */ 1736 len = strlen(LEGACY_RECDIR_ENV_PREFIX) + 1737 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; 1738 1739 result = kmalloc(len, GFP_KERNEL); 1740 if (!result) 1741 return result; 1742 1743 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", 1744 nfs4_recoverydir()); 1745 if (copied > (len - HEXDIR_LEN)) { 1746 /* just return nothing if output will be truncated */ 1747 kfree(result); 1748 return NULL; 1749 } 1750 1751 copied = nfs4_make_rec_clidname(result + copied, name); 1752 if (copied) { 1753 kfree(result); 1754 return NULL; 1755 } 1756 1757 return result; 1758} 1759 1760static char * 1761nfsd4_cltrack_client_has_session(struct nfs4_client *clp) 1762{ 1763 int copied; 1764 size_t len; 1765 char *result; 1766 1767 /* prefix + Y/N character + terminating NULL */ 1768 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1; 1769 1770 result = kmalloc(len, GFP_KERNEL); 1771 if (!result) 1772 return result; 1773 1774 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c", 1775 clp->cl_minorversion ? 'Y' : 'N'); 1776 if (copied >= len) { 1777 /* just return nothing if output was truncated */ 1778 kfree(result); 1779 return NULL; 1780 } 1781 1782 return result; 1783} 1784 1785static char * 1786nfsd4_cltrack_grace_start(time64_t grace_start) 1787{ 1788 int copied; 1789 size_t len; 1790 char *result; 1791 1792 /* prefix + max width of int64_t string + terminating NULL */ 1793 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1; 1794 1795 result = kmalloc(len, GFP_KERNEL); 1796 if (!result) 1797 return result; 1798 1799 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%lld", 1800 grace_start); 1801 if (copied >= len) { 1802 /* just return nothing if output was truncated */ 1803 kfree(result); 1804 return NULL; 1805 } 1806 1807 return result; 1808} 1809 1810static int 1811nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1) 1812{ 1813 char *envp[3]; 1814 char *argv[4]; 1815 int ret; 1816 1817 if (unlikely(!cltrack_prog[0])) { 1818 dprintk("%s: cltrack_prog is disabled\n", __func__); 1819 return -EACCES; 1820 } 1821 1822 dprintk("%s: cmd: %s\n", __func__, cmd); 1823 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); 1824 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)"); 1825 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)"); 1826 1827 envp[0] = env0; 1828 envp[1] = env1; 1829 envp[2] = NULL; 1830 1831 argv[0] = (char *)cltrack_prog; 1832 argv[1] = cmd; 1833 argv[2] = arg; 1834 argv[3] = NULL; 1835 1836 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); 1837 /* 1838 * Disable the upcall mechanism if we're getting an ENOENT or EACCES 1839 * error. The admin can re-enable it on the fly by using sysfs 1840 * once the problem has been fixed. 1841 */ 1842 if (ret == -ENOENT || ret == -EACCES) { 1843 dprintk("NFSD: %s was not found or isn't executable (%d). " 1844 "Setting cltrack_prog to blank string!", 1845 cltrack_prog, ret); 1846 cltrack_prog[0] = '\0'; 1847 } 1848 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); 1849 1850 return ret; 1851} 1852 1853static char * 1854bin_to_hex_dup(const unsigned char *src, int srclen) 1855{ 1856 char *buf; 1857 1858 /* +1 for terminating NULL */ 1859 buf = kzalloc((srclen * 2) + 1, GFP_KERNEL); 1860 if (!buf) 1861 return buf; 1862 1863 bin2hex(buf, src, srclen); 1864 return buf; 1865} 1866 1867static int 1868nfsd4_umh_cltrack_init(struct net *net) 1869{ 1870 int ret; 1871 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 1872 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time); 1873 1874 /* XXX: The usermode helper s not working in container yet. */ 1875 if (net != &init_net) { 1876 pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n"); 1877 kfree(grace_start); 1878 return -EINVAL; 1879 } 1880 1881 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL); 1882 kfree(grace_start); 1883 if (!ret) 1884 pr_info("NFSD: Using UMH upcall client tracking operations.\n"); 1885 return ret; 1886} 1887 1888static void 1889nfsd4_cltrack_upcall_lock(struct nfs4_client *clp) 1890{ 1891 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK, 1892 TASK_UNINTERRUPTIBLE); 1893} 1894 1895static void 1896nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp) 1897{ 1898 smp_mb__before_atomic(); 1899 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags); 1900 smp_mb__after_atomic(); 1901 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK); 1902} 1903 1904static void 1905nfsd4_umh_cltrack_create(struct nfs4_client *clp) 1906{ 1907 char *hexid, *has_session, *grace_start; 1908 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 1909 1910 /* 1911 * With v4.0 clients, there's little difference in outcome between a 1912 * create and check operation, and we can end up calling into this 1913 * function multiple times per client (once for each openowner). So, 1914 * for v4.0 clients skip upcalling once the client has been recorded 1915 * on stable storage. 1916 * 1917 * For v4.1+ clients, the outcome of the two operations is different, 1918 * so we must ensure that we upcall for the create operation. v4.1+ 1919 * clients call this on RECLAIM_COMPLETE though, so we should only end 1920 * up doing a single create upcall per client. 1921 */ 1922 if (clp->cl_minorversion == 0 && 1923 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1924 return; 1925 1926 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); 1927 if (!hexid) { 1928 dprintk("%s: can't allocate memory for upcall!\n", __func__); 1929 return; 1930 } 1931 1932 has_session = nfsd4_cltrack_client_has_session(clp); 1933 grace_start = nfsd4_cltrack_grace_start(nn->boot_time); 1934 1935 nfsd4_cltrack_upcall_lock(clp); 1936 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start)) 1937 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1938 nfsd4_cltrack_upcall_unlock(clp); 1939 1940 kfree(has_session); 1941 kfree(grace_start); 1942 kfree(hexid); 1943} 1944 1945static void 1946nfsd4_umh_cltrack_remove(struct nfs4_client *clp) 1947{ 1948 char *hexid; 1949 1950 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1951 return; 1952 1953 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); 1954 if (!hexid) { 1955 dprintk("%s: can't allocate memory for upcall!\n", __func__); 1956 return; 1957 } 1958 1959 nfsd4_cltrack_upcall_lock(clp); 1960 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) && 1961 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0) 1962 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1963 nfsd4_cltrack_upcall_unlock(clp); 1964 1965 kfree(hexid); 1966} 1967 1968static int 1969nfsd4_umh_cltrack_check(struct nfs4_client *clp) 1970{ 1971 int ret; 1972 char *hexid, *has_session, *legacy; 1973 1974 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) 1975 return 0; 1976 1977 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); 1978 if (!hexid) { 1979 dprintk("%s: can't allocate memory for upcall!\n", __func__); 1980 return -ENOMEM; 1981 } 1982 1983 has_session = nfsd4_cltrack_client_has_session(clp); 1984 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); 1985 1986 nfsd4_cltrack_upcall_lock(clp); 1987 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) { 1988 ret = 0; 1989 } else { 1990 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); 1991 if (ret == 0) 1992 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); 1993 } 1994 nfsd4_cltrack_upcall_unlock(clp); 1995 kfree(has_session); 1996 kfree(legacy); 1997 kfree(hexid); 1998 1999 return ret; 2000} 2001 2002static void 2003nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn) 2004{ 2005 char *legacy; 2006 char timestr[22]; /* FIXME: better way to determine max size? */ 2007 2008 sprintf(timestr, "%lld", nn->boot_time); 2009 legacy = nfsd4_cltrack_legacy_topdir(); 2010 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL); 2011 kfree(legacy); 2012} 2013 2014static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { 2015 .init = nfsd4_umh_cltrack_init, 2016 .exit = NULL, 2017 .create = nfsd4_umh_cltrack_create, 2018 .remove = nfsd4_umh_cltrack_remove, 2019 .check = nfsd4_umh_cltrack_check, 2020 .grace_done = nfsd4_umh_cltrack_grace_done, 2021 .version = 1, 2022 .msglen = 0, 2023}; 2024 2025static inline int check_for_legacy_methods(int status, struct net *net) 2026{ 2027 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2028 struct path path; 2029 2030 /* 2031 * Next, try the UMH upcall. 2032 */ 2033 nn->client_tracking_ops = &nfsd4_umh_tracking_ops; 2034 status = nn->client_tracking_ops->init(net); 2035 if (!status) 2036 return status; 2037 2038 /* 2039 * Finally, See if the recoverydir exists and is a directory. 2040 * If it is, then use the legacy ops. 2041 */ 2042 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; 2043 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); 2044 if (!status) { 2045 status = !d_is_dir(path.dentry); 2046 path_put(&path); 2047 if (status) 2048 return -ENOTDIR; 2049 status = nn->client_tracking_ops->init(net); 2050 } 2051 return status; 2052} 2053#else 2054static inline int check_for_legacy_methods(int status, struct net *net) 2055{ 2056 return status; 2057} 2058#endif /* CONFIG_LEGACY_NFSD_CLIENT_TRACKING */ 2059 2060int 2061nfsd4_client_tracking_init(struct net *net) 2062{ 2063 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2064 int status; 2065 2066 /* just run the init if it the method is already decided */ 2067 if (nn->client_tracking_ops) 2068 goto do_init; 2069 2070 /* First, try to use nfsdcld */ 2071 nn->client_tracking_ops = &nfsd4_cld_tracking_ops; 2072 status = nn->client_tracking_ops->init(net); 2073 if (!status) 2074 return status; 2075 if (status != -ETIMEDOUT) { 2076 nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0; 2077 status = nn->client_tracking_ops->init(net); 2078 if (!status) 2079 return status; 2080 } 2081 2082 status = check_for_legacy_methods(status, net); 2083 if (status) 2084 goto out; 2085do_init: 2086 status = nn->client_tracking_ops->init(net); 2087out: 2088 if (status) { 2089 printk(KERN_WARNING "NFSD: Unable to initialize client " 2090 "recovery tracking! (%d)\n", status); 2091 nn->client_tracking_ops = NULL; 2092 } 2093 return status; 2094} 2095 2096void 2097nfsd4_client_tracking_exit(struct net *net) 2098{ 2099 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2100 2101 if (nn->client_tracking_ops) { 2102 if (nn->client_tracking_ops->exit) 2103 nn->client_tracking_ops->exit(net); 2104 nn->client_tracking_ops = NULL; 2105 } 2106} 2107 2108void 2109nfsd4_client_record_create(struct nfs4_client *clp) 2110{ 2111 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 2112 2113 if (nn->client_tracking_ops) 2114 nn->client_tracking_ops->create(clp); 2115} 2116 2117void 2118nfsd4_client_record_remove(struct nfs4_client *clp) 2119{ 2120 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 2121 2122 if (nn->client_tracking_ops) 2123 nn->client_tracking_ops->remove(clp); 2124} 2125 2126int 2127nfsd4_client_record_check(struct nfs4_client *clp) 2128{ 2129 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); 2130 2131 if (nn->client_tracking_ops) 2132 return nn->client_tracking_ops->check(clp); 2133 2134 return -EOPNOTSUPP; 2135} 2136 2137void 2138nfsd4_record_grace_done(struct nfsd_net *nn) 2139{ 2140 if (nn->client_tracking_ops) 2141 nn->client_tracking_ops->grace_done(nn); 2142} 2143 2144static int 2145rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) 2146{ 2147 struct super_block *sb = ptr; 2148 struct net *net = sb->s_fs_info; 2149 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 2150 struct cld_net *cn = nn->cld_net; 2151 struct dentry *dentry; 2152 int ret = 0; 2153 2154 if (!try_module_get(THIS_MODULE)) 2155 return 0; 2156 2157 if (!cn) { 2158 module_put(THIS_MODULE); 2159 return 0; 2160 } 2161 2162 switch (event) { 2163 case RPC_PIPEFS_MOUNT: 2164 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); 2165 if (IS_ERR(dentry)) { 2166 ret = PTR_ERR(dentry); 2167 break; 2168 } 2169 cn->cn_pipe->dentry = dentry; 2170 break; 2171 case RPC_PIPEFS_UMOUNT: 2172 if (cn->cn_pipe->dentry) 2173 nfsd4_cld_unregister_sb(cn->cn_pipe); 2174 break; 2175 default: 2176 ret = -ENOTSUPP; 2177 break; 2178 } 2179 module_put(THIS_MODULE); 2180 return ret; 2181} 2182 2183static struct notifier_block nfsd4_cld_block = { 2184 .notifier_call = rpc_pipefs_event, 2185}; 2186 2187int 2188register_cld_notifier(void) 2189{ 2190 WARN_ON(!nfsd_net_id); 2191 return rpc_pipefs_notifier_register(&nfsd4_cld_block); 2192} 2193 2194void 2195unregister_cld_notifier(void) 2196{ 2197 rpc_pipefs_notifier_unregister(&nfsd4_cld_block); 2198} 2199