1 /* 2 * linux/fs/nfs/callback_proc.c 3 * 4 * Copyright (C) 2004 Trond Myklebust 5 * 6 * NFSv4 callback procedures 7 */ 8 #include <linux/nfs4.h> 9 #include <linux/nfs_fs.h> 10 #include <linux/slab.h> 11 #include "nfs4_fs.h" 12 #include "callback.h" 13 #include "delegation.h" 14 #include "internal.h" 15 #include "pnfs.h" 16 17 #ifdef NFS_DEBUG 18 #define NFSDBG_FACILITY NFSDBG_CALLBACK 19 #endif 20 21 __be32 nfs4_callback_getattr(struct cb_getattrargs *args, 22 struct cb_getattrres *res, 23 struct cb_process_state *cps) 24 { 25 struct nfs_delegation *delegation; 26 struct nfs_inode *nfsi; 27 struct inode *inode; 28 29 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 30 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 31 goto out; 32 33 res->bitmap[0] = res->bitmap[1] = 0; 34 res->status = htonl(NFS4ERR_BADHANDLE); 35 36 dprintk("NFS: GETATTR callback request from %s\n", 37 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 38 39 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 40 if (inode == NULL) 41 goto out; 42 nfsi = NFS_I(inode); 43 rcu_read_lock(); 44 delegation = rcu_dereference(nfsi->delegation); 45 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) 46 goto out_iput; 47 res->size = i_size_read(inode); 48 res->change_attr = delegation->change_attr; 49 if (nfsi->npages != 0) 50 res->change_attr++; 51 res->ctime = inode->i_ctime; 52 res->mtime = inode->i_mtime; 53 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & 54 args->bitmap[0]; 55 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & 56 args->bitmap[1]; 57 res->status = 0; 58 out_iput: 59 rcu_read_unlock(); 60 iput(inode); 61 out: 62 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); 63 return res->status; 64 } 65 66 __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy, 67 struct cb_process_state *cps) 68 { 69 struct inode *inode; 70 __be32 res; 71 72 res = htonl(NFS4ERR_OP_NOT_IN_SESSION); 73 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 74 goto out; 75 76 dprintk("NFS: RECALL callback request from %s\n", 77 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 78 79 res = htonl(NFS4ERR_BADHANDLE); 80 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 81 if (inode == NULL) 82 goto out; 83 /* Set up a helper thread to actually return the delegation */ 84 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { 85 case 0: 86 res = 0; 87 break; 88 case -ENOENT: 89 if (res != 0) 90 res = htonl(NFS4ERR_BAD_STATEID); 91 break; 92 default: 93 res = htonl(NFS4ERR_RESOURCE); 94 } 95 iput(inode); 96 out: 97 dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); 98 return res; 99 } 100 101 int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) 102 { 103 if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data, 104 sizeof(delegation->stateid.data)) != 0) 105 return 0; 106 return 1; 107 } 108 109 #if defined(CONFIG_NFS_V4_1) 110 111 static u32 initiate_file_draining(struct nfs_client *clp, 112 struct cb_layoutrecallargs *args) 113 { 114 struct pnfs_layout_hdr *lo; 115 struct inode *ino; 116 bool found = false; 117 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 118 LIST_HEAD(free_me_list); 119 120 spin_lock(&clp->cl_lock); 121 list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) { 122 if (nfs_compare_fh(&args->cbl_fh, 123 &NFS_I(lo->plh_inode)->fh)) 124 continue; 125 ino = igrab(lo->plh_inode); 126 if (!ino) 127 continue; 128 found = true; 129 /* Without this, layout can be freed as soon 130 * as we release cl_lock. 131 */ 132 get_layout_hdr(lo); 133 break; 134 } 135 spin_unlock(&clp->cl_lock); 136 if (!found) 137 return NFS4ERR_NOMATCHING_LAYOUT; 138 139 spin_lock(&ino->i_lock); 140 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || 141 mark_matching_lsegs_invalid(lo, &free_me_list, 142 args->cbl_range.iomode)) 143 rv = NFS4ERR_DELAY; 144 else 145 rv = NFS4ERR_NOMATCHING_LAYOUT; 146 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); 147 spin_unlock(&ino->i_lock); 148 pnfs_free_lseg_list(&free_me_list); 149 put_layout_hdr(lo); 150 iput(ino); 151 return rv; 152 } 153 154 static u32 initiate_bulk_draining(struct nfs_client *clp, 155 struct cb_layoutrecallargs *args) 156 { 157 struct pnfs_layout_hdr *lo; 158 struct inode *ino; 159 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 160 struct pnfs_layout_hdr *tmp; 161 LIST_HEAD(recall_list); 162 LIST_HEAD(free_me_list); 163 struct pnfs_layout_range range = { 164 .iomode = IOMODE_ANY, 165 .offset = 0, 166 .length = NFS4_MAX_UINT64, 167 }; 168 169 spin_lock(&clp->cl_lock); 170 list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) { 171 if ((args->cbl_recall_type == RETURN_FSID) && 172 memcmp(&NFS_SERVER(lo->plh_inode)->fsid, 173 &args->cbl_fsid, sizeof(struct nfs_fsid))) 174 continue; 175 if (!igrab(lo->plh_inode)) 176 continue; 177 get_layout_hdr(lo); 178 BUG_ON(!list_empty(&lo->plh_bulk_recall)); 179 list_add(&lo->plh_bulk_recall, &recall_list); 180 } 181 spin_unlock(&clp->cl_lock); 182 list_for_each_entry_safe(lo, tmp, 183 &recall_list, plh_bulk_recall) { 184 ino = lo->plh_inode; 185 spin_lock(&ino->i_lock); 186 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 187 if (mark_matching_lsegs_invalid(lo, &free_me_list, range.iomode)) 188 rv = NFS4ERR_DELAY; 189 list_del_init(&lo->plh_bulk_recall); 190 spin_unlock(&ino->i_lock); 191 put_layout_hdr(lo); 192 iput(ino); 193 } 194 pnfs_free_lseg_list(&free_me_list); 195 return rv; 196 } 197 198 static u32 do_callback_layoutrecall(struct nfs_client *clp, 199 struct cb_layoutrecallargs *args) 200 { 201 u32 res = NFS4ERR_DELAY; 202 203 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type); 204 if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state)) 205 goto out; 206 if (args->cbl_recall_type == RETURN_FILE) 207 res = initiate_file_draining(clp, args); 208 else 209 res = initiate_bulk_draining(clp, args); 210 clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state); 211 out: 212 dprintk("%s returning %i\n", __func__, res); 213 return res; 214 215 } 216 217 __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args, 218 void *dummy, struct cb_process_state *cps) 219 { 220 u32 res; 221 222 dprintk("%s: -->\n", __func__); 223 224 if (cps->clp) 225 res = do_callback_layoutrecall(cps->clp, args); 226 else 227 res = NFS4ERR_OP_NOT_IN_SESSION; 228 229 dprintk("%s: exit with status = %d\n", __func__, res); 230 return cpu_to_be32(res); 231 } 232 233 static void pnfs_recall_all_layouts(struct nfs_client *clp) 234 { 235 struct cb_layoutrecallargs args; 236 237 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 238 memset(&args, 0, sizeof(args)); 239 args.cbl_recall_type = RETURN_ALL; 240 /* FIXME we ignore errors, what should we do? */ 241 do_callback_layoutrecall(clp, &args); 242 } 243 244 int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) 245 { 246 if (delegation == NULL) 247 return 0; 248 249 if (stateid->stateid.seqid != 0) 250 return 0; 251 if (memcmp(&delegation->stateid.stateid.other, 252 &stateid->stateid.other, 253 NFS4_STATEID_OTHER_SIZE)) 254 return 0; 255 256 return 1; 257 } 258 259 /* 260 * Validate the sequenceID sent by the server. 261 * Return success if the sequenceID is one more than what we last saw on 262 * this slot, accounting for wraparound. Increments the slot's sequence. 263 * 264 * We don't yet implement a duplicate request cache, instead we set the 265 * back channel ca_maxresponsesize_cached to zero. This is OK for now 266 * since we only currently implement idempotent callbacks anyway. 267 * 268 * We have a single slot backchannel at this time, so we don't bother 269 * checking the used_slots bit array on the table. The lower layer guarantees 270 * a single outstanding callback request at a time. 271 */ 272 static __be32 273 validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args) 274 { 275 struct nfs4_slot *slot; 276 277 dprintk("%s enter. slotid %d seqid %d\n", 278 __func__, args->csa_slotid, args->csa_sequenceid); 279 280 if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS) 281 return htonl(NFS4ERR_BADSLOT); 282 283 slot = tbl->slots + args->csa_slotid; 284 dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr); 285 286 /* Normal */ 287 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) { 288 slot->seq_nr++; 289 return htonl(NFS4_OK); 290 } 291 292 /* Replay */ 293 if (args->csa_sequenceid == slot->seq_nr) { 294 dprintk("%s seqid %d is a replay\n", 295 __func__, args->csa_sequenceid); 296 /* Signal process_op to set this error on next op */ 297 if (args->csa_cachethis == 0) 298 return htonl(NFS4ERR_RETRY_UNCACHED_REP); 299 300 /* The ca_maxresponsesize_cached is 0 with no DRC */ 301 else if (args->csa_cachethis == 1) 302 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 303 } 304 305 /* Wraparound */ 306 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) { 307 slot->seq_nr = 1; 308 return htonl(NFS4_OK); 309 } 310 311 /* Misordered request */ 312 return htonl(NFS4ERR_SEQ_MISORDERED); 313 } 314 315 /* 316 * For each referring call triple, check the session's slot table for 317 * a match. If the slot is in use and the sequence numbers match, the 318 * client is still waiting for a response to the original request. 319 */ 320 static bool referring_call_exists(struct nfs_client *clp, 321 uint32_t nrclists, 322 struct referring_call_list *rclists) 323 { 324 bool status = 0; 325 int i, j; 326 struct nfs4_session *session; 327 struct nfs4_slot_table *tbl; 328 struct referring_call_list *rclist; 329 struct referring_call *ref; 330 331 /* 332 * XXX When client trunking is implemented, this becomes 333 * a session lookup from within the loop 334 */ 335 session = clp->cl_session; 336 tbl = &session->fc_slot_table; 337 338 for (i = 0; i < nrclists; i++) { 339 rclist = &rclists[i]; 340 if (memcmp(session->sess_id.data, 341 rclist->rcl_sessionid.data, 342 NFS4_MAX_SESSIONID_LEN) != 0) 343 continue; 344 345 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 346 ref = &rclist->rcl_refcalls[j]; 347 348 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u " 349 "slotid %u\n", __func__, 350 ((u32 *)&rclist->rcl_sessionid.data)[0], 351 ((u32 *)&rclist->rcl_sessionid.data)[1], 352 ((u32 *)&rclist->rcl_sessionid.data)[2], 353 ((u32 *)&rclist->rcl_sessionid.data)[3], 354 ref->rc_sequenceid, ref->rc_slotid); 355 356 spin_lock(&tbl->slot_tbl_lock); 357 status = (test_bit(ref->rc_slotid, tbl->used_slots) && 358 tbl->slots[ref->rc_slotid].seq_nr == 359 ref->rc_sequenceid); 360 spin_unlock(&tbl->slot_tbl_lock); 361 if (status) 362 goto out; 363 } 364 } 365 366 out: 367 return status; 368 } 369 370 __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, 371 struct cb_sequenceres *res, 372 struct cb_process_state *cps) 373 { 374 struct nfs_client *clp; 375 int i; 376 __be32 status; 377 378 cps->clp = NULL; 379 380 status = htonl(NFS4ERR_BADSESSION); 381 /* Incoming session must match the callback session */ 382 if (memcmp(&args->csa_sessionid, cps->svc_sid, NFS4_MAX_SESSIONID_LEN)) 383 goto out; 384 385 clp = nfs4_find_client_sessionid(args->csa_addr, 386 &args->csa_sessionid, 1); 387 if (clp == NULL) 388 goto out; 389 390 /* state manager is resetting the session */ 391 if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) { 392 status = NFS4ERR_DELAY; 393 goto out; 394 } 395 396 status = validate_seqid(&clp->cl_session->bc_slot_table, args); 397 if (status) 398 goto out; 399 400 /* 401 * Check for pending referring calls. If a match is found, a 402 * related callback was received before the response to the original 403 * call. 404 */ 405 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) { 406 status = htonl(NFS4ERR_DELAY); 407 goto out; 408 } 409 410 memcpy(&res->csr_sessionid, &args->csa_sessionid, 411 sizeof(res->csr_sessionid)); 412 res->csr_sequenceid = args->csa_sequenceid; 413 res->csr_slotid = args->csa_slotid; 414 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; 415 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; 416 nfs4_cb_take_slot(clp); 417 cps->clp = clp; /* put in nfs4_callback_compound */ 418 419 out: 420 for (i = 0; i < args->csa_nrclists; i++) 421 kfree(args->csa_rclists[i].rcl_refcalls); 422 kfree(args->csa_rclists); 423 424 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 425 cps->drc_status = status; 426 status = 0; 427 } else 428 res->csr_status = status; 429 430 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__, 431 ntohl(status), ntohl(res->csr_status)); 432 return status; 433 } 434 435 static bool 436 validate_bitmap_values(unsigned long mask) 437 { 438 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 439 } 440 441 __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy, 442 struct cb_process_state *cps) 443 { 444 __be32 status; 445 fmode_t flags = 0; 446 447 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 448 if (!cps->clp) /* set in cb_sequence */ 449 goto out; 450 451 dprintk("NFS: RECALL_ANY callback request from %s\n", 452 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 453 454 status = cpu_to_be32(NFS4ERR_INVAL); 455 if (!validate_bitmap_values(args->craa_type_mask)) 456 goto out; 457 458 status = cpu_to_be32(NFS4_OK); 459 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *) 460 &args->craa_type_mask)) 461 flags = FMODE_READ; 462 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *) 463 &args->craa_type_mask)) 464 flags |= FMODE_WRITE; 465 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *) 466 &args->craa_type_mask)) 467 pnfs_recall_all_layouts(cps->clp); 468 if (flags) 469 nfs_expire_all_delegation_types(cps->clp, flags); 470 out: 471 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 472 return status; 473 } 474 475 /* Reduce the fore channel's max_slots to the target value */ 476 __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy, 477 struct cb_process_state *cps) 478 { 479 struct nfs4_slot_table *fc_tbl; 480 __be32 status; 481 482 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 483 if (!cps->clp) /* set in cb_sequence */ 484 goto out; 485 486 dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n", 487 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 488 args->crsa_target_max_slots); 489 490 fc_tbl = &cps->clp->cl_session->fc_slot_table; 491 492 status = htonl(NFS4ERR_BAD_HIGH_SLOT); 493 if (args->crsa_target_max_slots > fc_tbl->max_slots || 494 args->crsa_target_max_slots < 1) 495 goto out; 496 497 status = htonl(NFS4_OK); 498 if (args->crsa_target_max_slots == fc_tbl->max_slots) 499 goto out; 500 501 fc_tbl->target_max_slots = args->crsa_target_max_slots; 502 nfs41_handle_recall_slot(cps->clp); 503 out: 504 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 505 return status; 506 } 507 #endif /* CONFIG_NFS_V4_1 */ 508