| 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 <kandros@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 <linux/file.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/namei.h> |
| 39 | #include <linux/swap.h> |
| 40 | #include <linux/pagemap.h> |
| 41 | #include <linux/sunrpc/svcauth_gss.h> |
| 42 | #include <linux/sunrpc/clnt.h> |
| 43 | #include "xdr4.h" |
| 44 | #include "vfs.h" |
| 45 | #include "current_stateid.h" |
| 46 | |
| 47 | #define NFSDDBG_FACILITY NFSDDBG_PROC |
| 48 | |
| 49 | /* Globals */ |
| 50 | time_t nfsd4_lease = 90; /* default lease time */ |
| 51 | time_t nfsd4_grace = 90; |
| 52 | static time_t boot_time; |
| 53 | |
| 54 | #define all_ones {{~0,~0},~0} |
| 55 | static const stateid_t one_stateid = { |
| 56 | .si_generation = ~0, |
| 57 | .si_opaque = all_ones, |
| 58 | }; |
| 59 | static const stateid_t zero_stateid = { |
| 60 | /* all fields zero */ |
| 61 | }; |
| 62 | static const stateid_t currentstateid = { |
| 63 | .si_generation = 1, |
| 64 | }; |
| 65 | |
| 66 | static u64 current_sessionid = 1; |
| 67 | |
| 68 | #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t))) |
| 69 | #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t))) |
| 70 | #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t))) |
| 71 | |
| 72 | /* forward declarations */ |
| 73 | static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner); |
| 74 | |
| 75 | /* Locking: */ |
| 76 | |
| 77 | /* Currently used for almost all code touching nfsv4 state: */ |
| 78 | static DEFINE_MUTEX(client_mutex); |
| 79 | |
| 80 | /* |
| 81 | * Currently used for the del_recall_lru and file hash table. In an |
| 82 | * effort to decrease the scope of the client_mutex, this spinlock may |
| 83 | * eventually cover more: |
| 84 | */ |
| 85 | static DEFINE_SPINLOCK(recall_lock); |
| 86 | |
| 87 | static struct kmem_cache *openowner_slab = NULL; |
| 88 | static struct kmem_cache *lockowner_slab = NULL; |
| 89 | static struct kmem_cache *file_slab = NULL; |
| 90 | static struct kmem_cache *stateid_slab = NULL; |
| 91 | static struct kmem_cache *deleg_slab = NULL; |
| 92 | |
| 93 | void |
| 94 | nfs4_lock_state(void) |
| 95 | { |
| 96 | mutex_lock(&client_mutex); |
| 97 | } |
| 98 | |
| 99 | static void free_session(struct kref *); |
| 100 | |
| 101 | /* Must be called under the client_lock */ |
| 102 | static void nfsd4_put_session_locked(struct nfsd4_session *ses) |
| 103 | { |
| 104 | kref_put(&ses->se_ref, free_session); |
| 105 | } |
| 106 | |
| 107 | static void nfsd4_get_session(struct nfsd4_session *ses) |
| 108 | { |
| 109 | kref_get(&ses->se_ref); |
| 110 | } |
| 111 | |
| 112 | void |
| 113 | nfs4_unlock_state(void) |
| 114 | { |
| 115 | mutex_unlock(&client_mutex); |
| 116 | } |
| 117 | |
| 118 | static inline u32 |
| 119 | opaque_hashval(const void *ptr, int nbytes) |
| 120 | { |
| 121 | unsigned char *cptr = (unsigned char *) ptr; |
| 122 | |
| 123 | u32 x = 0; |
| 124 | while (nbytes--) { |
| 125 | x *= 37; |
| 126 | x += *cptr++; |
| 127 | } |
| 128 | return x; |
| 129 | } |
| 130 | |
| 131 | static struct list_head del_recall_lru; |
| 132 | |
| 133 | static void nfsd4_free_file(struct nfs4_file *f) |
| 134 | { |
| 135 | kmem_cache_free(file_slab, f); |
| 136 | } |
| 137 | |
| 138 | static inline void |
| 139 | put_nfs4_file(struct nfs4_file *fi) |
| 140 | { |
| 141 | if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { |
| 142 | list_del(&fi->fi_hash); |
| 143 | spin_unlock(&recall_lock); |
| 144 | iput(fi->fi_inode); |
| 145 | nfsd4_free_file(fi); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | static inline void |
| 150 | get_nfs4_file(struct nfs4_file *fi) |
| 151 | { |
| 152 | atomic_inc(&fi->fi_ref); |
| 153 | } |
| 154 | |
| 155 | static int num_delegations; |
| 156 | unsigned int max_delegations; |
| 157 | |
| 158 | /* |
| 159 | * Open owner state (share locks) |
| 160 | */ |
| 161 | |
| 162 | /* hash tables for lock and open owners */ |
| 163 | #define OWNER_HASH_BITS 8 |
| 164 | #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) |
| 165 | #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) |
| 166 | |
| 167 | static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername) |
| 168 | { |
| 169 | unsigned int ret; |
| 170 | |
| 171 | ret = opaque_hashval(ownername->data, ownername->len); |
| 172 | ret += clientid; |
| 173 | return ret & OWNER_HASH_MASK; |
| 174 | } |
| 175 | |
| 176 | static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; |
| 177 | |
| 178 | /* hash table for nfs4_file */ |
| 179 | #define FILE_HASH_BITS 8 |
| 180 | #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) |
| 181 | |
| 182 | static unsigned int file_hashval(struct inode *ino) |
| 183 | { |
| 184 | /* XXX: why are we hashing on inode pointer, anyway? */ |
| 185 | return hash_ptr(ino, FILE_HASH_BITS); |
| 186 | } |
| 187 | |
| 188 | static struct list_head file_hashtbl[FILE_HASH_SIZE]; |
| 189 | |
| 190 | static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag) |
| 191 | { |
| 192 | BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR])); |
| 193 | atomic_inc(&fp->fi_access[oflag]); |
| 194 | } |
| 195 | |
| 196 | static void nfs4_file_get_access(struct nfs4_file *fp, int oflag) |
| 197 | { |
| 198 | if (oflag == O_RDWR) { |
| 199 | __nfs4_file_get_access(fp, O_RDONLY); |
| 200 | __nfs4_file_get_access(fp, O_WRONLY); |
| 201 | } else |
| 202 | __nfs4_file_get_access(fp, oflag); |
| 203 | } |
| 204 | |
| 205 | static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag) |
| 206 | { |
| 207 | if (fp->fi_fds[oflag]) { |
| 208 | fput(fp->fi_fds[oflag]); |
| 209 | fp->fi_fds[oflag] = NULL; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) |
| 214 | { |
| 215 | if (atomic_dec_and_test(&fp->fi_access[oflag])) { |
| 216 | nfs4_file_put_fd(fp, oflag); |
| 217 | /* |
| 218 | * It's also safe to get rid of the RDWR open *if* |
| 219 | * we no longer have need of the other kind of access |
| 220 | * or if we already have the other kind of open: |
| 221 | */ |
| 222 | if (fp->fi_fds[1-oflag] |
| 223 | || atomic_read(&fp->fi_access[1 - oflag]) == 0) |
| 224 | nfs4_file_put_fd(fp, O_RDWR); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | static void nfs4_file_put_access(struct nfs4_file *fp, int oflag) |
| 229 | { |
| 230 | if (oflag == O_RDWR) { |
| 231 | __nfs4_file_put_access(fp, O_RDONLY); |
| 232 | __nfs4_file_put_access(fp, O_WRONLY); |
| 233 | } else |
| 234 | __nfs4_file_put_access(fp, oflag); |
| 235 | } |
| 236 | |
| 237 | static inline int get_new_stid(struct nfs4_stid *stid) |
| 238 | { |
| 239 | static int min_stateid = 0; |
| 240 | struct idr *stateids = &stid->sc_client->cl_stateids; |
| 241 | int new_stid; |
| 242 | int error; |
| 243 | |
| 244 | error = idr_get_new_above(stateids, stid, min_stateid, &new_stid); |
| 245 | /* |
| 246 | * Note: the necessary preallocation was done in |
| 247 | * nfs4_alloc_stateid(). The idr code caps the number of |
| 248 | * preallocations that can exist at a time, but the state lock |
| 249 | * prevents anyone from using ours before we get here: |
| 250 | */ |
| 251 | BUG_ON(error); |
| 252 | /* |
| 253 | * It shouldn't be a problem to reuse an opaque stateid value. |
| 254 | * I don't think it is for 4.1. But with 4.0 I worry that, for |
| 255 | * example, a stray write retransmission could be accepted by |
| 256 | * the server when it should have been rejected. Therefore, |
| 257 | * adopt a trick from the sctp code to attempt to maximize the |
| 258 | * amount of time until an id is reused, by ensuring they always |
| 259 | * "increase" (mod INT_MAX): |
| 260 | */ |
| 261 | |
| 262 | min_stateid = new_stid+1; |
| 263 | if (min_stateid == INT_MAX) |
| 264 | min_stateid = 0; |
| 265 | return new_stid; |
| 266 | } |
| 267 | |
| 268 | static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type) |
| 269 | { |
| 270 | stateid_t *s = &stid->sc_stateid; |
| 271 | int new_id; |
| 272 | |
| 273 | stid->sc_type = type; |
| 274 | stid->sc_client = cl; |
| 275 | s->si_opaque.so_clid = cl->cl_clientid; |
| 276 | new_id = get_new_stid(stid); |
| 277 | s->si_opaque.so_id = (u32)new_id; |
| 278 | /* Will be incremented before return to client: */ |
| 279 | s->si_generation = 0; |
| 280 | } |
| 281 | |
| 282 | static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab) |
| 283 | { |
| 284 | struct idr *stateids = &cl->cl_stateids; |
| 285 | |
| 286 | if (!idr_pre_get(stateids, GFP_KERNEL)) |
| 287 | return NULL; |
| 288 | /* |
| 289 | * Note: if we fail here (or any time between now and the time |
| 290 | * we actually get the new idr), we won't need to undo the idr |
| 291 | * preallocation, since the idr code caps the number of |
| 292 | * preallocated entries. |
| 293 | */ |
| 294 | return kmem_cache_alloc(slab, GFP_KERNEL); |
| 295 | } |
| 296 | |
| 297 | static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp) |
| 298 | { |
| 299 | return openlockstateid(nfs4_alloc_stid(clp, stateid_slab)); |
| 300 | } |
| 301 | |
| 302 | static struct nfs4_delegation * |
| 303 | alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type) |
| 304 | { |
| 305 | struct nfs4_delegation *dp; |
| 306 | struct nfs4_file *fp = stp->st_file; |
| 307 | |
| 308 | dprintk("NFSD alloc_init_deleg\n"); |
| 309 | /* |
| 310 | * Major work on the lease subsystem (for example, to support |
| 311 | * calbacks on stat) will be required before we can support |
| 312 | * write delegations properly. |
| 313 | */ |
| 314 | if (type != NFS4_OPEN_DELEGATE_READ) |
| 315 | return NULL; |
| 316 | if (fp->fi_had_conflict) |
| 317 | return NULL; |
| 318 | if (num_delegations > max_delegations) |
| 319 | return NULL; |
| 320 | dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab)); |
| 321 | if (dp == NULL) |
| 322 | return dp; |
| 323 | init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID); |
| 324 | /* |
| 325 | * delegation seqid's are never incremented. The 4.1 special |
| 326 | * meaning of seqid 0 isn't meaningful, really, but let's avoid |
| 327 | * 0 anyway just for consistency and use 1: |
| 328 | */ |
| 329 | dp->dl_stid.sc_stateid.si_generation = 1; |
| 330 | num_delegations++; |
| 331 | INIT_LIST_HEAD(&dp->dl_perfile); |
| 332 | INIT_LIST_HEAD(&dp->dl_perclnt); |
| 333 | INIT_LIST_HEAD(&dp->dl_recall_lru); |
| 334 | get_nfs4_file(fp); |
| 335 | dp->dl_file = fp; |
| 336 | dp->dl_type = type; |
| 337 | fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle); |
| 338 | dp->dl_time = 0; |
| 339 | atomic_set(&dp->dl_count, 1); |
| 340 | INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc); |
| 341 | return dp; |
| 342 | } |
| 343 | |
| 344 | void |
| 345 | nfs4_put_delegation(struct nfs4_delegation *dp) |
| 346 | { |
| 347 | if (atomic_dec_and_test(&dp->dl_count)) { |
| 348 | dprintk("NFSD: freeing dp %p\n",dp); |
| 349 | put_nfs4_file(dp->dl_file); |
| 350 | kmem_cache_free(deleg_slab, dp); |
| 351 | num_delegations--; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | static void nfs4_put_deleg_lease(struct nfs4_file *fp) |
| 356 | { |
| 357 | if (atomic_dec_and_test(&fp->fi_delegees)) { |
| 358 | vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease); |
| 359 | fp->fi_lease = NULL; |
| 360 | fput(fp->fi_deleg_file); |
| 361 | fp->fi_deleg_file = NULL; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | static void unhash_stid(struct nfs4_stid *s) |
| 366 | { |
| 367 | struct idr *stateids = &s->sc_client->cl_stateids; |
| 368 | |
| 369 | idr_remove(stateids, s->sc_stateid.si_opaque.so_id); |
| 370 | } |
| 371 | |
| 372 | /* Called under the state lock. */ |
| 373 | static void |
| 374 | unhash_delegation(struct nfs4_delegation *dp) |
| 375 | { |
| 376 | unhash_stid(&dp->dl_stid); |
| 377 | list_del_init(&dp->dl_perclnt); |
| 378 | spin_lock(&recall_lock); |
| 379 | list_del_init(&dp->dl_perfile); |
| 380 | list_del_init(&dp->dl_recall_lru); |
| 381 | spin_unlock(&recall_lock); |
| 382 | nfs4_put_deleg_lease(dp->dl_file); |
| 383 | nfs4_put_delegation(dp); |
| 384 | } |
| 385 | |
| 386 | /* |
| 387 | * SETCLIENTID state |
| 388 | */ |
| 389 | |
| 390 | /* client_lock protects the client lru list and session hash table */ |
| 391 | static DEFINE_SPINLOCK(client_lock); |
| 392 | |
| 393 | /* Hash tables for nfs4_clientid state */ |
| 394 | #define CLIENT_HASH_BITS 4 |
| 395 | #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) |
| 396 | #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) |
| 397 | |
| 398 | static unsigned int clientid_hashval(u32 id) |
| 399 | { |
| 400 | return id & CLIENT_HASH_MASK; |
| 401 | } |
| 402 | |
| 403 | static unsigned int clientstr_hashval(const char *name) |
| 404 | { |
| 405 | return opaque_hashval(name, 8) & CLIENT_HASH_MASK; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * reclaim_str_hashtbl[] holds known client info from previous reset/reboot |
| 410 | * used in reboot/reset lease grace period processing |
| 411 | * |
| 412 | * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed |
| 413 | * setclientid_confirmed info. |
| 414 | * |
| 415 | * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed |
| 416 | * setclientid info. |
| 417 | * |
| 418 | * client_lru holds client queue ordered by nfs4_client.cl_time |
| 419 | * for lease renewal. |
| 420 | * |
| 421 | * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time |
| 422 | * for last close replay. |
| 423 | */ |
| 424 | static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; |
| 425 | static int reclaim_str_hashtbl_size = 0; |
| 426 | static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; |
| 427 | static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; |
| 428 | static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; |
| 429 | static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; |
| 430 | static struct list_head client_lru; |
| 431 | static struct list_head close_lru; |
| 432 | |
| 433 | /* |
| 434 | * We store the NONE, READ, WRITE, and BOTH bits separately in the |
| 435 | * st_{access,deny}_bmap field of the stateid, in order to track not |
| 436 | * only what share bits are currently in force, but also what |
| 437 | * combinations of share bits previous opens have used. This allows us |
| 438 | * to enforce the recommendation of rfc 3530 14.2.19 that the server |
| 439 | * return an error if the client attempt to downgrade to a combination |
| 440 | * of share bits not explicable by closing some of its previous opens. |
| 441 | * |
| 442 | * XXX: This enforcement is actually incomplete, since we don't keep |
| 443 | * track of access/deny bit combinations; so, e.g., we allow: |
| 444 | * |
| 445 | * OPEN allow read, deny write |
| 446 | * OPEN allow both, deny none |
| 447 | * DOWNGRADE allow read, deny none |
| 448 | * |
| 449 | * which we should reject. |
| 450 | */ |
| 451 | static unsigned int |
| 452 | bmap_to_share_mode(unsigned long bmap) { |
| 453 | int i; |
| 454 | unsigned int access = 0; |
| 455 | |
| 456 | for (i = 1; i < 4; i++) { |
| 457 | if (test_bit(i, &bmap)) |
| 458 | access |= i; |
| 459 | } |
| 460 | return access; |
| 461 | } |
| 462 | |
| 463 | static bool |
| 464 | test_share(struct nfs4_ol_stateid *stp, struct nfsd4_open *open) { |
| 465 | unsigned int access, deny; |
| 466 | |
| 467 | access = bmap_to_share_mode(stp->st_access_bmap); |
| 468 | deny = bmap_to_share_mode(stp->st_deny_bmap); |
| 469 | if ((access & open->op_share_deny) || (deny & open->op_share_access)) |
| 470 | return false; |
| 471 | return true; |
| 472 | } |
| 473 | |
| 474 | /* set share access for a given stateid */ |
| 475 | static inline void |
| 476 | set_access(u32 access, struct nfs4_ol_stateid *stp) |
| 477 | { |
| 478 | __set_bit(access, &stp->st_access_bmap); |
| 479 | } |
| 480 | |
| 481 | /* clear share access for a given stateid */ |
| 482 | static inline void |
| 483 | clear_access(u32 access, struct nfs4_ol_stateid *stp) |
| 484 | { |
| 485 | __clear_bit(access, &stp->st_access_bmap); |
| 486 | } |
| 487 | |
| 488 | /* test whether a given stateid has access */ |
| 489 | static inline bool |
| 490 | test_access(u32 access, struct nfs4_ol_stateid *stp) |
| 491 | { |
| 492 | return test_bit(access, &stp->st_access_bmap); |
| 493 | } |
| 494 | |
| 495 | /* set share deny for a given stateid */ |
| 496 | static inline void |
| 497 | set_deny(u32 access, struct nfs4_ol_stateid *stp) |
| 498 | { |
| 499 | __set_bit(access, &stp->st_deny_bmap); |
| 500 | } |
| 501 | |
| 502 | /* clear share deny for a given stateid */ |
| 503 | static inline void |
| 504 | clear_deny(u32 access, struct nfs4_ol_stateid *stp) |
| 505 | { |
| 506 | __clear_bit(access, &stp->st_deny_bmap); |
| 507 | } |
| 508 | |
| 509 | /* test whether a given stateid is denying specific access */ |
| 510 | static inline bool |
| 511 | test_deny(u32 access, struct nfs4_ol_stateid *stp) |
| 512 | { |
| 513 | return test_bit(access, &stp->st_deny_bmap); |
| 514 | } |
| 515 | |
| 516 | static int nfs4_access_to_omode(u32 access) |
| 517 | { |
| 518 | switch (access & NFS4_SHARE_ACCESS_BOTH) { |
| 519 | case NFS4_SHARE_ACCESS_READ: |
| 520 | return O_RDONLY; |
| 521 | case NFS4_SHARE_ACCESS_WRITE: |
| 522 | return O_WRONLY; |
| 523 | case NFS4_SHARE_ACCESS_BOTH: |
| 524 | return O_RDWR; |
| 525 | } |
| 526 | BUG(); |
| 527 | } |
| 528 | |
| 529 | /* release all access and file references for a given stateid */ |
| 530 | static void |
| 531 | release_all_access(struct nfs4_ol_stateid *stp) |
| 532 | { |
| 533 | int i; |
| 534 | |
| 535 | for (i = 1; i < 4; i++) { |
| 536 | if (test_access(i, stp)) |
| 537 | nfs4_file_put_access(stp->st_file, |
| 538 | nfs4_access_to_omode(i)); |
| 539 | clear_access(i, stp); |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | static void unhash_generic_stateid(struct nfs4_ol_stateid *stp) |
| 544 | { |
| 545 | list_del(&stp->st_perfile); |
| 546 | list_del(&stp->st_perstateowner); |
| 547 | } |
| 548 | |
| 549 | static void close_generic_stateid(struct nfs4_ol_stateid *stp) |
| 550 | { |
| 551 | release_all_access(stp); |
| 552 | put_nfs4_file(stp->st_file); |
| 553 | stp->st_file = NULL; |
| 554 | } |
| 555 | |
| 556 | static void free_generic_stateid(struct nfs4_ol_stateid *stp) |
| 557 | { |
| 558 | kmem_cache_free(stateid_slab, stp); |
| 559 | } |
| 560 | |
| 561 | static void release_lock_stateid(struct nfs4_ol_stateid *stp) |
| 562 | { |
| 563 | struct file *file; |
| 564 | |
| 565 | unhash_generic_stateid(stp); |
| 566 | unhash_stid(&stp->st_stid); |
| 567 | file = find_any_file(stp->st_file); |
| 568 | if (file) |
| 569 | locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner)); |
| 570 | close_generic_stateid(stp); |
| 571 | free_generic_stateid(stp); |
| 572 | } |
| 573 | |
| 574 | static void unhash_lockowner(struct nfs4_lockowner *lo) |
| 575 | { |
| 576 | struct nfs4_ol_stateid *stp; |
| 577 | |
| 578 | list_del(&lo->lo_owner.so_strhash); |
| 579 | list_del(&lo->lo_perstateid); |
| 580 | list_del(&lo->lo_owner_ino_hash); |
| 581 | while (!list_empty(&lo->lo_owner.so_stateids)) { |
| 582 | stp = list_first_entry(&lo->lo_owner.so_stateids, |
| 583 | struct nfs4_ol_stateid, st_perstateowner); |
| 584 | release_lock_stateid(stp); |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | static void release_lockowner(struct nfs4_lockowner *lo) |
| 589 | { |
| 590 | unhash_lockowner(lo); |
| 591 | nfs4_free_lockowner(lo); |
| 592 | } |
| 593 | |
| 594 | static void |
| 595 | release_stateid_lockowners(struct nfs4_ol_stateid *open_stp) |
| 596 | { |
| 597 | struct nfs4_lockowner *lo; |
| 598 | |
| 599 | while (!list_empty(&open_stp->st_lockowners)) { |
| 600 | lo = list_entry(open_stp->st_lockowners.next, |
| 601 | struct nfs4_lockowner, lo_perstateid); |
| 602 | release_lockowner(lo); |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | static void unhash_open_stateid(struct nfs4_ol_stateid *stp) |
| 607 | { |
| 608 | unhash_generic_stateid(stp); |
| 609 | release_stateid_lockowners(stp); |
| 610 | close_generic_stateid(stp); |
| 611 | } |
| 612 | |
| 613 | static void release_open_stateid(struct nfs4_ol_stateid *stp) |
| 614 | { |
| 615 | unhash_open_stateid(stp); |
| 616 | unhash_stid(&stp->st_stid); |
| 617 | free_generic_stateid(stp); |
| 618 | } |
| 619 | |
| 620 | static void unhash_openowner(struct nfs4_openowner *oo) |
| 621 | { |
| 622 | struct nfs4_ol_stateid *stp; |
| 623 | |
| 624 | list_del(&oo->oo_owner.so_strhash); |
| 625 | list_del(&oo->oo_perclient); |
| 626 | while (!list_empty(&oo->oo_owner.so_stateids)) { |
| 627 | stp = list_first_entry(&oo->oo_owner.so_stateids, |
| 628 | struct nfs4_ol_stateid, st_perstateowner); |
| 629 | release_open_stateid(stp); |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | static void release_last_closed_stateid(struct nfs4_openowner *oo) |
| 634 | { |
| 635 | struct nfs4_ol_stateid *s = oo->oo_last_closed_stid; |
| 636 | |
| 637 | if (s) { |
| 638 | unhash_stid(&s->st_stid); |
| 639 | free_generic_stateid(s); |
| 640 | oo->oo_last_closed_stid = NULL; |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | static void release_openowner(struct nfs4_openowner *oo) |
| 645 | { |
| 646 | unhash_openowner(oo); |
| 647 | list_del(&oo->oo_close_lru); |
| 648 | release_last_closed_stateid(oo); |
| 649 | nfs4_free_openowner(oo); |
| 650 | } |
| 651 | |
| 652 | #define SESSION_HASH_SIZE 512 |
| 653 | static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE]; |
| 654 | |
| 655 | static inline int |
| 656 | hash_sessionid(struct nfs4_sessionid *sessionid) |
| 657 | { |
| 658 | struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; |
| 659 | |
| 660 | return sid->sequence % SESSION_HASH_SIZE; |
| 661 | } |
| 662 | |
| 663 | #ifdef NFSD_DEBUG |
| 664 | static inline void |
| 665 | dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) |
| 666 | { |
| 667 | u32 *ptr = (u32 *)(&sessionid->data[0]); |
| 668 | dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); |
| 669 | } |
| 670 | #else |
| 671 | static inline void |
| 672 | dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) |
| 673 | { |
| 674 | } |
| 675 | #endif |
| 676 | |
| 677 | |
| 678 | static void |
| 679 | gen_sessionid(struct nfsd4_session *ses) |
| 680 | { |
| 681 | struct nfs4_client *clp = ses->se_client; |
| 682 | struct nfsd4_sessionid *sid; |
| 683 | |
| 684 | sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; |
| 685 | sid->clientid = clp->cl_clientid; |
| 686 | sid->sequence = current_sessionid++; |
| 687 | sid->reserved = 0; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * The protocol defines ca_maxresponssize_cached to include the size of |
| 692 | * the rpc header, but all we need to cache is the data starting after |
| 693 | * the end of the initial SEQUENCE operation--the rest we regenerate |
| 694 | * each time. Therefore we can advertise a ca_maxresponssize_cached |
| 695 | * value that is the number of bytes in our cache plus a few additional |
| 696 | * bytes. In order to stay on the safe side, and not promise more than |
| 697 | * we can cache, those additional bytes must be the minimum possible: 24 |
| 698 | * bytes of rpc header (xid through accept state, with AUTH_NULL |
| 699 | * verifier), 12 for the compound header (with zero-length tag), and 44 |
| 700 | * for the SEQUENCE op response: |
| 701 | */ |
| 702 | #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) |
| 703 | |
| 704 | static void |
| 705 | free_session_slots(struct nfsd4_session *ses) |
| 706 | { |
| 707 | int i; |
| 708 | |
| 709 | for (i = 0; i < ses->se_fchannel.maxreqs; i++) |
| 710 | kfree(ses->se_slots[i]); |
| 711 | } |
| 712 | |
| 713 | /* |
| 714 | * We don't actually need to cache the rpc and session headers, so we |
| 715 | * can allocate a little less for each slot: |
| 716 | */ |
| 717 | static inline int slot_bytes(struct nfsd4_channel_attrs *ca) |
| 718 | { |
| 719 | return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; |
| 720 | } |
| 721 | |
| 722 | static int nfsd4_sanitize_slot_size(u32 size) |
| 723 | { |
| 724 | size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */ |
| 725 | size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE); |
| 726 | |
| 727 | return size; |
| 728 | } |
| 729 | |
| 730 | /* |
| 731 | * XXX: If we run out of reserved DRC memory we could (up to a point) |
| 732 | * re-negotiate active sessions and reduce their slot usage to make |
| 733 | * room for new connections. For now we just fail the create session. |
| 734 | */ |
| 735 | static int nfsd4_get_drc_mem(int slotsize, u32 num) |
| 736 | { |
| 737 | int avail; |
| 738 | |
| 739 | num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION); |
| 740 | |
| 741 | spin_lock(&nfsd_drc_lock); |
| 742 | avail = min_t(int, NFSD_MAX_MEM_PER_SESSION, |
| 743 | nfsd_drc_max_mem - nfsd_drc_mem_used); |
| 744 | num = min_t(int, num, avail / slotsize); |
| 745 | nfsd_drc_mem_used += num * slotsize; |
| 746 | spin_unlock(&nfsd_drc_lock); |
| 747 | |
| 748 | return num; |
| 749 | } |
| 750 | |
| 751 | static void nfsd4_put_drc_mem(int slotsize, int num) |
| 752 | { |
| 753 | spin_lock(&nfsd_drc_lock); |
| 754 | nfsd_drc_mem_used -= slotsize * num; |
| 755 | spin_unlock(&nfsd_drc_lock); |
| 756 | } |
| 757 | |
| 758 | static struct nfsd4_session *alloc_session(int slotsize, int numslots) |
| 759 | { |
| 760 | struct nfsd4_session *new; |
| 761 | int mem, i; |
| 762 | |
| 763 | BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *) |
| 764 | + sizeof(struct nfsd4_session) > PAGE_SIZE); |
| 765 | mem = numslots * sizeof(struct nfsd4_slot *); |
| 766 | |
| 767 | new = kzalloc(sizeof(*new) + mem, GFP_KERNEL); |
| 768 | if (!new) |
| 769 | return NULL; |
| 770 | /* allocate each struct nfsd4_slot and data cache in one piece */ |
| 771 | for (i = 0; i < numslots; i++) { |
| 772 | mem = sizeof(struct nfsd4_slot) + slotsize; |
| 773 | new->se_slots[i] = kzalloc(mem, GFP_KERNEL); |
| 774 | if (!new->se_slots[i]) |
| 775 | goto out_free; |
| 776 | } |
| 777 | return new; |
| 778 | out_free: |
| 779 | while (i--) |
| 780 | kfree(new->se_slots[i]); |
| 781 | kfree(new); |
| 782 | return NULL; |
| 783 | } |
| 784 | |
| 785 | static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize) |
| 786 | { |
| 787 | u32 maxrpc = nfsd_serv->sv_max_mesg; |
| 788 | |
| 789 | new->maxreqs = numslots; |
| 790 | new->maxresp_cached = min_t(u32, req->maxresp_cached, |
| 791 | slotsize + NFSD_MIN_HDR_SEQ_SZ); |
| 792 | new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc); |
| 793 | new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc); |
| 794 | new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND); |
| 795 | } |
| 796 | |
| 797 | static void free_conn(struct nfsd4_conn *c) |
| 798 | { |
| 799 | svc_xprt_put(c->cn_xprt); |
| 800 | kfree(c); |
| 801 | } |
| 802 | |
| 803 | static void nfsd4_conn_lost(struct svc_xpt_user *u) |
| 804 | { |
| 805 | struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); |
| 806 | struct nfs4_client *clp = c->cn_session->se_client; |
| 807 | |
| 808 | spin_lock(&clp->cl_lock); |
| 809 | if (!list_empty(&c->cn_persession)) { |
| 810 | list_del(&c->cn_persession); |
| 811 | free_conn(c); |
| 812 | } |
| 813 | spin_unlock(&clp->cl_lock); |
| 814 | nfsd4_probe_callback(clp); |
| 815 | } |
| 816 | |
| 817 | static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) |
| 818 | { |
| 819 | struct nfsd4_conn *conn; |
| 820 | |
| 821 | conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL); |
| 822 | if (!conn) |
| 823 | return NULL; |
| 824 | svc_xprt_get(rqstp->rq_xprt); |
| 825 | conn->cn_xprt = rqstp->rq_xprt; |
| 826 | conn->cn_flags = flags; |
| 827 | INIT_LIST_HEAD(&conn->cn_xpt_user.list); |
| 828 | return conn; |
| 829 | } |
| 830 | |
| 831 | static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) |
| 832 | { |
| 833 | conn->cn_session = ses; |
| 834 | list_add(&conn->cn_persession, &ses->se_conns); |
| 835 | } |
| 836 | |
| 837 | static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) |
| 838 | { |
| 839 | struct nfs4_client *clp = ses->se_client; |
| 840 | |
| 841 | spin_lock(&clp->cl_lock); |
| 842 | __nfsd4_hash_conn(conn, ses); |
| 843 | spin_unlock(&clp->cl_lock); |
| 844 | } |
| 845 | |
| 846 | static int nfsd4_register_conn(struct nfsd4_conn *conn) |
| 847 | { |
| 848 | conn->cn_xpt_user.callback = nfsd4_conn_lost; |
| 849 | return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); |
| 850 | } |
| 851 | |
| 852 | static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses, u32 dir) |
| 853 | { |
| 854 | struct nfsd4_conn *conn; |
| 855 | int ret; |
| 856 | |
| 857 | conn = alloc_conn(rqstp, dir); |
| 858 | if (!conn) |
| 859 | return nfserr_jukebox; |
| 860 | nfsd4_hash_conn(conn, ses); |
| 861 | ret = nfsd4_register_conn(conn); |
| 862 | if (ret) |
| 863 | /* oops; xprt is already down: */ |
| 864 | nfsd4_conn_lost(&conn->cn_xpt_user); |
| 865 | return nfs_ok; |
| 866 | } |
| 867 | |
| 868 | static __be32 nfsd4_new_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_session *ses) |
| 869 | { |
| 870 | u32 dir = NFS4_CDFC4_FORE; |
| 871 | |
| 872 | if (ses->se_flags & SESSION4_BACK_CHAN) |
| 873 | dir |= NFS4_CDFC4_BACK; |
| 874 | |
| 875 | return nfsd4_new_conn(rqstp, ses, dir); |
| 876 | } |
| 877 | |
| 878 | /* must be called under client_lock */ |
| 879 | static void nfsd4_del_conns(struct nfsd4_session *s) |
| 880 | { |
| 881 | struct nfs4_client *clp = s->se_client; |
| 882 | struct nfsd4_conn *c; |
| 883 | |
| 884 | spin_lock(&clp->cl_lock); |
| 885 | while (!list_empty(&s->se_conns)) { |
| 886 | c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); |
| 887 | list_del_init(&c->cn_persession); |
| 888 | spin_unlock(&clp->cl_lock); |
| 889 | |
| 890 | unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); |
| 891 | free_conn(c); |
| 892 | |
| 893 | spin_lock(&clp->cl_lock); |
| 894 | } |
| 895 | spin_unlock(&clp->cl_lock); |
| 896 | } |
| 897 | |
| 898 | static void free_session(struct kref *kref) |
| 899 | { |
| 900 | struct nfsd4_session *ses; |
| 901 | int mem; |
| 902 | |
| 903 | BUG_ON(!spin_is_locked(&client_lock)); |
| 904 | ses = container_of(kref, struct nfsd4_session, se_ref); |
| 905 | nfsd4_del_conns(ses); |
| 906 | spin_lock(&nfsd_drc_lock); |
| 907 | mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel); |
| 908 | nfsd_drc_mem_used -= mem; |
| 909 | spin_unlock(&nfsd_drc_lock); |
| 910 | free_session_slots(ses); |
| 911 | kfree(ses); |
| 912 | } |
| 913 | |
| 914 | void nfsd4_put_session(struct nfsd4_session *ses) |
| 915 | { |
| 916 | spin_lock(&client_lock); |
| 917 | nfsd4_put_session_locked(ses); |
| 918 | spin_unlock(&client_lock); |
| 919 | } |
| 920 | |
| 921 | static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses) |
| 922 | { |
| 923 | struct nfsd4_session *new; |
| 924 | struct nfsd4_channel_attrs *fchan = &cses->fore_channel; |
| 925 | int numslots, slotsize; |
| 926 | __be32 status; |
| 927 | int idx; |
| 928 | |
| 929 | /* |
| 930 | * Note decreasing slot size below client's request may |
| 931 | * make it difficult for client to function correctly, whereas |
| 932 | * decreasing the number of slots will (just?) affect |
| 933 | * performance. When short on memory we therefore prefer to |
| 934 | * decrease number of slots instead of their size. |
| 935 | */ |
| 936 | slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached); |
| 937 | numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs); |
| 938 | if (numslots < 1) |
| 939 | return NULL; |
| 940 | |
| 941 | new = alloc_session(slotsize, numslots); |
| 942 | if (!new) { |
| 943 | nfsd4_put_drc_mem(slotsize, fchan->maxreqs); |
| 944 | return NULL; |
| 945 | } |
| 946 | init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize); |
| 947 | |
| 948 | new->se_client = clp; |
| 949 | gen_sessionid(new); |
| 950 | |
| 951 | INIT_LIST_HEAD(&new->se_conns); |
| 952 | |
| 953 | new->se_cb_seq_nr = 1; |
| 954 | new->se_flags = cses->flags; |
| 955 | new->se_cb_prog = cses->callback_prog; |
| 956 | kref_init(&new->se_ref); |
| 957 | idx = hash_sessionid(&new->se_sessionid); |
| 958 | spin_lock(&client_lock); |
| 959 | list_add(&new->se_hash, &sessionid_hashtbl[idx]); |
| 960 | spin_lock(&clp->cl_lock); |
| 961 | list_add(&new->se_perclnt, &clp->cl_sessions); |
| 962 | spin_unlock(&clp->cl_lock); |
| 963 | spin_unlock(&client_lock); |
| 964 | |
| 965 | status = nfsd4_new_conn_from_crses(rqstp, new); |
| 966 | /* whoops: benny points out, status is ignored! (err, or bogus) */ |
| 967 | if (status) { |
| 968 | spin_lock(&client_lock); |
| 969 | free_session(&new->se_ref); |
| 970 | spin_unlock(&client_lock); |
| 971 | return NULL; |
| 972 | } |
| 973 | if (cses->flags & SESSION4_BACK_CHAN) { |
| 974 | struct sockaddr *sa = svc_addr(rqstp); |
| 975 | /* |
| 976 | * This is a little silly; with sessions there's no real |
| 977 | * use for the callback address. Use the peer address |
| 978 | * as a reasonable default for now, but consider fixing |
| 979 | * the rpc client not to require an address in the |
| 980 | * future: |
| 981 | */ |
| 982 | rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); |
| 983 | clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); |
| 984 | } |
| 985 | nfsd4_probe_callback(clp); |
| 986 | return new; |
| 987 | } |
| 988 | |
| 989 | /* caller must hold client_lock */ |
| 990 | static struct nfsd4_session * |
| 991 | find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid) |
| 992 | { |
| 993 | struct nfsd4_session *elem; |
| 994 | int idx; |
| 995 | |
| 996 | dump_sessionid(__func__, sessionid); |
| 997 | idx = hash_sessionid(sessionid); |
| 998 | /* Search in the appropriate list */ |
| 999 | list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) { |
| 1000 | if (!memcmp(elem->se_sessionid.data, sessionid->data, |
| 1001 | NFS4_MAX_SESSIONID_LEN)) { |
| 1002 | return elem; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | dprintk("%s: session not found\n", __func__); |
| 1007 | return NULL; |
| 1008 | } |
| 1009 | |
| 1010 | /* caller must hold client_lock */ |
| 1011 | static void |
| 1012 | unhash_session(struct nfsd4_session *ses) |
| 1013 | { |
| 1014 | list_del(&ses->se_hash); |
| 1015 | spin_lock(&ses->se_client->cl_lock); |
| 1016 | list_del(&ses->se_perclnt); |
| 1017 | spin_unlock(&ses->se_client->cl_lock); |
| 1018 | } |
| 1019 | |
| 1020 | /* must be called under the client_lock */ |
| 1021 | static inline void |
| 1022 | renew_client_locked(struct nfs4_client *clp) |
| 1023 | { |
| 1024 | if (is_client_expired(clp)) { |
| 1025 | dprintk("%s: client (clientid %08x/%08x) already expired\n", |
| 1026 | __func__, |
| 1027 | clp->cl_clientid.cl_boot, |
| 1028 | clp->cl_clientid.cl_id); |
| 1029 | return; |
| 1030 | } |
| 1031 | |
| 1032 | dprintk("renewing client (clientid %08x/%08x)\n", |
| 1033 | clp->cl_clientid.cl_boot, |
| 1034 | clp->cl_clientid.cl_id); |
| 1035 | list_move_tail(&clp->cl_lru, &client_lru); |
| 1036 | clp->cl_time = get_seconds(); |
| 1037 | } |
| 1038 | |
| 1039 | static inline void |
| 1040 | renew_client(struct nfs4_client *clp) |
| 1041 | { |
| 1042 | spin_lock(&client_lock); |
| 1043 | renew_client_locked(clp); |
| 1044 | spin_unlock(&client_lock); |
| 1045 | } |
| 1046 | |
| 1047 | /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ |
| 1048 | static int |
| 1049 | STALE_CLIENTID(clientid_t *clid) |
| 1050 | { |
| 1051 | if (clid->cl_boot == boot_time) |
| 1052 | return 0; |
| 1053 | dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", |
| 1054 | clid->cl_boot, clid->cl_id, boot_time); |
| 1055 | return 1; |
| 1056 | } |
| 1057 | |
| 1058 | /* |
| 1059 | * XXX Should we use a slab cache ? |
| 1060 | * This type of memory management is somewhat inefficient, but we use it |
| 1061 | * anyway since SETCLIENTID is not a common operation. |
| 1062 | */ |
| 1063 | static struct nfs4_client *alloc_client(struct xdr_netobj name) |
| 1064 | { |
| 1065 | struct nfs4_client *clp; |
| 1066 | |
| 1067 | clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); |
| 1068 | if (clp == NULL) |
| 1069 | return NULL; |
| 1070 | clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL); |
| 1071 | if (clp->cl_name.data == NULL) { |
| 1072 | kfree(clp); |
| 1073 | return NULL; |
| 1074 | } |
| 1075 | clp->cl_name.len = name.len; |
| 1076 | return clp; |
| 1077 | } |
| 1078 | |
| 1079 | static inline void |
| 1080 | free_client(struct nfs4_client *clp) |
| 1081 | { |
| 1082 | BUG_ON(!spin_is_locked(&client_lock)); |
| 1083 | while (!list_empty(&clp->cl_sessions)) { |
| 1084 | struct nfsd4_session *ses; |
| 1085 | ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, |
| 1086 | se_perclnt); |
| 1087 | list_del(&ses->se_perclnt); |
| 1088 | nfsd4_put_session_locked(ses); |
| 1089 | } |
| 1090 | if (clp->cl_cred.cr_group_info) |
| 1091 | put_group_info(clp->cl_cred.cr_group_info); |
| 1092 | kfree(clp->cl_principal); |
| 1093 | kfree(clp->cl_name.data); |
| 1094 | kfree(clp); |
| 1095 | } |
| 1096 | |
| 1097 | void |
| 1098 | release_session_client(struct nfsd4_session *session) |
| 1099 | { |
| 1100 | struct nfs4_client *clp = session->se_client; |
| 1101 | |
| 1102 | if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock)) |
| 1103 | return; |
| 1104 | if (is_client_expired(clp)) { |
| 1105 | free_client(clp); |
| 1106 | session->se_client = NULL; |
| 1107 | } else |
| 1108 | renew_client_locked(clp); |
| 1109 | spin_unlock(&client_lock); |
| 1110 | } |
| 1111 | |
| 1112 | /* must be called under the client_lock */ |
| 1113 | static inline void |
| 1114 | unhash_client_locked(struct nfs4_client *clp) |
| 1115 | { |
| 1116 | struct nfsd4_session *ses; |
| 1117 | |
| 1118 | mark_client_expired(clp); |
| 1119 | list_del(&clp->cl_lru); |
| 1120 | spin_lock(&clp->cl_lock); |
| 1121 | list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) |
| 1122 | list_del_init(&ses->se_hash); |
| 1123 | spin_unlock(&clp->cl_lock); |
| 1124 | } |
| 1125 | |
| 1126 | static void |
| 1127 | expire_client(struct nfs4_client *clp) |
| 1128 | { |
| 1129 | struct nfs4_openowner *oo; |
| 1130 | struct nfs4_delegation *dp; |
| 1131 | struct list_head reaplist; |
| 1132 | |
| 1133 | INIT_LIST_HEAD(&reaplist); |
| 1134 | spin_lock(&recall_lock); |
| 1135 | while (!list_empty(&clp->cl_delegations)) { |
| 1136 | dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); |
| 1137 | list_del_init(&dp->dl_perclnt); |
| 1138 | list_move(&dp->dl_recall_lru, &reaplist); |
| 1139 | } |
| 1140 | spin_unlock(&recall_lock); |
| 1141 | while (!list_empty(&reaplist)) { |
| 1142 | dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); |
| 1143 | unhash_delegation(dp); |
| 1144 | } |
| 1145 | while (!list_empty(&clp->cl_openowners)) { |
| 1146 | oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient); |
| 1147 | release_openowner(oo); |
| 1148 | } |
| 1149 | nfsd4_shutdown_callback(clp); |
| 1150 | if (clp->cl_cb_conn.cb_xprt) |
| 1151 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); |
| 1152 | list_del(&clp->cl_idhash); |
| 1153 | list_del(&clp->cl_strhash); |
| 1154 | spin_lock(&client_lock); |
| 1155 | unhash_client_locked(clp); |
| 1156 | if (atomic_read(&clp->cl_refcount) == 0) |
| 1157 | free_client(clp); |
| 1158 | spin_unlock(&client_lock); |
| 1159 | } |
| 1160 | |
| 1161 | static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) |
| 1162 | { |
| 1163 | memcpy(target->cl_verifier.data, source->data, |
| 1164 | sizeof(target->cl_verifier.data)); |
| 1165 | } |
| 1166 | |
| 1167 | static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) |
| 1168 | { |
| 1169 | target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; |
| 1170 | target->cl_clientid.cl_id = source->cl_clientid.cl_id; |
| 1171 | } |
| 1172 | |
| 1173 | static void copy_cred(struct svc_cred *target, struct svc_cred *source) |
| 1174 | { |
| 1175 | target->cr_uid = source->cr_uid; |
| 1176 | target->cr_gid = source->cr_gid; |
| 1177 | target->cr_group_info = source->cr_group_info; |
| 1178 | get_group_info(target->cr_group_info); |
| 1179 | } |
| 1180 | |
| 1181 | static int same_name(const char *n1, const char *n2) |
| 1182 | { |
| 1183 | return 0 == memcmp(n1, n2, HEXDIR_LEN); |
| 1184 | } |
| 1185 | |
| 1186 | static int |
| 1187 | same_verf(nfs4_verifier *v1, nfs4_verifier *v2) |
| 1188 | { |
| 1189 | return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); |
| 1190 | } |
| 1191 | |
| 1192 | static int |
| 1193 | same_clid(clientid_t *cl1, clientid_t *cl2) |
| 1194 | { |
| 1195 | return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); |
| 1196 | } |
| 1197 | |
| 1198 | /* XXX what about NGROUP */ |
| 1199 | static int |
| 1200 | same_creds(struct svc_cred *cr1, struct svc_cred *cr2) |
| 1201 | { |
| 1202 | return cr1->cr_uid == cr2->cr_uid; |
| 1203 | } |
| 1204 | |
| 1205 | static void gen_clid(struct nfs4_client *clp) |
| 1206 | { |
| 1207 | static u32 current_clientid = 1; |
| 1208 | |
| 1209 | clp->cl_clientid.cl_boot = boot_time; |
| 1210 | clp->cl_clientid.cl_id = current_clientid++; |
| 1211 | } |
| 1212 | |
| 1213 | static void gen_confirm(struct nfs4_client *clp) |
| 1214 | { |
| 1215 | __be32 verf[2]; |
| 1216 | static u32 i; |
| 1217 | |
| 1218 | verf[0] = (__be32)get_seconds(); |
| 1219 | verf[1] = (__be32)i++; |
| 1220 | memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data)); |
| 1221 | } |
| 1222 | |
| 1223 | static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t) |
| 1224 | { |
| 1225 | return idr_find(&cl->cl_stateids, t->si_opaque.so_id); |
| 1226 | } |
| 1227 | |
| 1228 | static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask) |
| 1229 | { |
| 1230 | struct nfs4_stid *s; |
| 1231 | |
| 1232 | s = find_stateid(cl, t); |
| 1233 | if (!s) |
| 1234 | return NULL; |
| 1235 | if (typemask & s->sc_type) |
| 1236 | return s; |
| 1237 | return NULL; |
| 1238 | } |
| 1239 | |
| 1240 | static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir, |
| 1241 | struct svc_rqst *rqstp, nfs4_verifier *verf) |
| 1242 | { |
| 1243 | struct nfs4_client *clp; |
| 1244 | struct sockaddr *sa = svc_addr(rqstp); |
| 1245 | char *princ; |
| 1246 | |
| 1247 | clp = alloc_client(name); |
| 1248 | if (clp == NULL) |
| 1249 | return NULL; |
| 1250 | |
| 1251 | INIT_LIST_HEAD(&clp->cl_sessions); |
| 1252 | |
| 1253 | princ = svc_gss_principal(rqstp); |
| 1254 | if (princ) { |
| 1255 | clp->cl_principal = kstrdup(princ, GFP_KERNEL); |
| 1256 | if (clp->cl_principal == NULL) { |
| 1257 | spin_lock(&client_lock); |
| 1258 | free_client(clp); |
| 1259 | spin_unlock(&client_lock); |
| 1260 | return NULL; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | idr_init(&clp->cl_stateids); |
| 1265 | memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); |
| 1266 | atomic_set(&clp->cl_refcount, 0); |
| 1267 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
| 1268 | INIT_LIST_HEAD(&clp->cl_idhash); |
| 1269 | INIT_LIST_HEAD(&clp->cl_strhash); |
| 1270 | INIT_LIST_HEAD(&clp->cl_openowners); |
| 1271 | INIT_LIST_HEAD(&clp->cl_delegations); |
| 1272 | INIT_LIST_HEAD(&clp->cl_lru); |
| 1273 | INIT_LIST_HEAD(&clp->cl_callbacks); |
| 1274 | spin_lock_init(&clp->cl_lock); |
| 1275 | INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc); |
| 1276 | clp->cl_time = get_seconds(); |
| 1277 | clear_bit(0, &clp->cl_cb_slot_busy); |
| 1278 | rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); |
| 1279 | copy_verf(clp, verf); |
| 1280 | rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); |
| 1281 | clp->cl_flavor = rqstp->rq_flavor; |
| 1282 | copy_cred(&clp->cl_cred, &rqstp->rq_cred); |
| 1283 | gen_confirm(clp); |
| 1284 | clp->cl_cb_session = NULL; |
| 1285 | return clp; |
| 1286 | } |
| 1287 | |
| 1288 | static void |
| 1289 | add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) |
| 1290 | { |
| 1291 | unsigned int idhashval; |
| 1292 | |
| 1293 | list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); |
| 1294 | idhashval = clientid_hashval(clp->cl_clientid.cl_id); |
| 1295 | list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); |
| 1296 | renew_client(clp); |
| 1297 | } |
| 1298 | |
| 1299 | static void |
| 1300 | move_to_confirmed(struct nfs4_client *clp) |
| 1301 | { |
| 1302 | unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); |
| 1303 | unsigned int strhashval; |
| 1304 | |
| 1305 | dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); |
| 1306 | list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); |
| 1307 | strhashval = clientstr_hashval(clp->cl_recdir); |
| 1308 | list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); |
| 1309 | renew_client(clp); |
| 1310 | } |
| 1311 | |
| 1312 | static struct nfs4_client * |
| 1313 | find_confirmed_client(clientid_t *clid) |
| 1314 | { |
| 1315 | struct nfs4_client *clp; |
| 1316 | unsigned int idhashval = clientid_hashval(clid->cl_id); |
| 1317 | |
| 1318 | list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { |
| 1319 | if (same_clid(&clp->cl_clientid, clid)) { |
| 1320 | renew_client(clp); |
| 1321 | return clp; |
| 1322 | } |
| 1323 | } |
| 1324 | return NULL; |
| 1325 | } |
| 1326 | |
| 1327 | static struct nfs4_client * |
| 1328 | find_unconfirmed_client(clientid_t *clid) |
| 1329 | { |
| 1330 | struct nfs4_client *clp; |
| 1331 | unsigned int idhashval = clientid_hashval(clid->cl_id); |
| 1332 | |
| 1333 | list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { |
| 1334 | if (same_clid(&clp->cl_clientid, clid)) |
| 1335 | return clp; |
| 1336 | } |
| 1337 | return NULL; |
| 1338 | } |
| 1339 | |
| 1340 | static bool clp_used_exchangeid(struct nfs4_client *clp) |
| 1341 | { |
| 1342 | return clp->cl_exchange_flags != 0; |
| 1343 | } |
| 1344 | |
| 1345 | static struct nfs4_client * |
| 1346 | find_confirmed_client_by_str(const char *dname, unsigned int hashval) |
| 1347 | { |
| 1348 | struct nfs4_client *clp; |
| 1349 | |
| 1350 | list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { |
| 1351 | if (same_name(clp->cl_recdir, dname)) |
| 1352 | return clp; |
| 1353 | } |
| 1354 | return NULL; |
| 1355 | } |
| 1356 | |
| 1357 | static struct nfs4_client * |
| 1358 | find_unconfirmed_client_by_str(const char *dname, unsigned int hashval) |
| 1359 | { |
| 1360 | struct nfs4_client *clp; |
| 1361 | |
| 1362 | list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { |
| 1363 | if (same_name(clp->cl_recdir, dname)) |
| 1364 | return clp; |
| 1365 | } |
| 1366 | return NULL; |
| 1367 | } |
| 1368 | |
| 1369 | static void |
| 1370 | gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp) |
| 1371 | { |
| 1372 | struct nfs4_cb_conn *conn = &clp->cl_cb_conn; |
| 1373 | struct sockaddr *sa = svc_addr(rqstp); |
| 1374 | u32 scopeid = rpc_get_scope_id(sa); |
| 1375 | unsigned short expected_family; |
| 1376 | |
| 1377 | /* Currently, we only support tcp and tcp6 for the callback channel */ |
| 1378 | if (se->se_callback_netid_len == 3 && |
| 1379 | !memcmp(se->se_callback_netid_val, "tcp", 3)) |
| 1380 | expected_family = AF_INET; |
| 1381 | else if (se->se_callback_netid_len == 4 && |
| 1382 | !memcmp(se->se_callback_netid_val, "tcp6", 4)) |
| 1383 | expected_family = AF_INET6; |
| 1384 | else |
| 1385 | goto out_err; |
| 1386 | |
| 1387 | conn->cb_addrlen = rpc_uaddr2sockaddr(&init_net, se->se_callback_addr_val, |
| 1388 | se->se_callback_addr_len, |
| 1389 | (struct sockaddr *)&conn->cb_addr, |
| 1390 | sizeof(conn->cb_addr)); |
| 1391 | |
| 1392 | if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) |
| 1393 | goto out_err; |
| 1394 | |
| 1395 | if (conn->cb_addr.ss_family == AF_INET6) |
| 1396 | ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; |
| 1397 | |
| 1398 | conn->cb_prog = se->se_callback_prog; |
| 1399 | conn->cb_ident = se->se_callback_ident; |
| 1400 | memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen); |
| 1401 | return; |
| 1402 | out_err: |
| 1403 | conn->cb_addr.ss_family = AF_UNSPEC; |
| 1404 | conn->cb_addrlen = 0; |
| 1405 | dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " |
| 1406 | "will not receive delegations\n", |
| 1407 | clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); |
| 1408 | |
| 1409 | return; |
| 1410 | } |
| 1411 | |
| 1412 | /* |
| 1413 | * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size. |
| 1414 | */ |
| 1415 | void |
| 1416 | nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) |
| 1417 | { |
| 1418 | struct nfsd4_slot *slot = resp->cstate.slot; |
| 1419 | unsigned int base; |
| 1420 | |
| 1421 | dprintk("--> %s slot %p\n", __func__, slot); |
| 1422 | |
| 1423 | slot->sl_opcnt = resp->opcnt; |
| 1424 | slot->sl_status = resp->cstate.status; |
| 1425 | |
| 1426 | slot->sl_flags |= NFSD4_SLOT_INITIALIZED; |
| 1427 | if (nfsd4_not_cached(resp)) { |
| 1428 | slot->sl_datalen = 0; |
| 1429 | return; |
| 1430 | } |
| 1431 | slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap; |
| 1432 | base = (char *)resp->cstate.datap - |
| 1433 | (char *)resp->xbuf->head[0].iov_base; |
| 1434 | if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data, |
| 1435 | slot->sl_datalen)) |
| 1436 | WARN("%s: sessions DRC could not cache compound\n", __func__); |
| 1437 | return; |
| 1438 | } |
| 1439 | |
| 1440 | /* |
| 1441 | * Encode the replay sequence operation from the slot values. |
| 1442 | * If cachethis is FALSE encode the uncached rep error on the next |
| 1443 | * operation which sets resp->p and increments resp->opcnt for |
| 1444 | * nfs4svc_encode_compoundres. |
| 1445 | * |
| 1446 | */ |
| 1447 | static __be32 |
| 1448 | nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, |
| 1449 | struct nfsd4_compoundres *resp) |
| 1450 | { |
| 1451 | struct nfsd4_op *op; |
| 1452 | struct nfsd4_slot *slot = resp->cstate.slot; |
| 1453 | |
| 1454 | /* Encode the replayed sequence operation */ |
| 1455 | op = &args->ops[resp->opcnt - 1]; |
| 1456 | nfsd4_encode_operation(resp, op); |
| 1457 | |
| 1458 | /* Return nfserr_retry_uncached_rep in next operation. */ |
| 1459 | if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) { |
| 1460 | op = &args->ops[resp->opcnt++]; |
| 1461 | op->status = nfserr_retry_uncached_rep; |
| 1462 | nfsd4_encode_operation(resp, op); |
| 1463 | } |
| 1464 | return op->status; |
| 1465 | } |
| 1466 | |
| 1467 | /* |
| 1468 | * The sequence operation is not cached because we can use the slot and |
| 1469 | * session values. |
| 1470 | */ |
| 1471 | __be32 |
| 1472 | nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, |
| 1473 | struct nfsd4_sequence *seq) |
| 1474 | { |
| 1475 | struct nfsd4_slot *slot = resp->cstate.slot; |
| 1476 | __be32 status; |
| 1477 | |
| 1478 | dprintk("--> %s slot %p\n", __func__, slot); |
| 1479 | |
| 1480 | /* Either returns 0 or nfserr_retry_uncached */ |
| 1481 | status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); |
| 1482 | if (status == nfserr_retry_uncached_rep) |
| 1483 | return status; |
| 1484 | |
| 1485 | /* The sequence operation has been encoded, cstate->datap set. */ |
| 1486 | memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen); |
| 1487 | |
| 1488 | resp->opcnt = slot->sl_opcnt; |
| 1489 | resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen); |
| 1490 | status = slot->sl_status; |
| 1491 | |
| 1492 | return status; |
| 1493 | } |
| 1494 | |
| 1495 | /* |
| 1496 | * Set the exchange_id flags returned by the server. |
| 1497 | */ |
| 1498 | static void |
| 1499 | nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) |
| 1500 | { |
| 1501 | /* pNFS is not supported */ |
| 1502 | new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; |
| 1503 | |
| 1504 | /* Referrals are supported, Migration is not. */ |
| 1505 | new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; |
| 1506 | |
| 1507 | /* set the wire flags to return to client. */ |
| 1508 | clid->flags = new->cl_exchange_flags; |
| 1509 | } |
| 1510 | |
| 1511 | __be32 |
| 1512 | nfsd4_exchange_id(struct svc_rqst *rqstp, |
| 1513 | struct nfsd4_compound_state *cstate, |
| 1514 | struct nfsd4_exchange_id *exid) |
| 1515 | { |
| 1516 | struct nfs4_client *unconf, *conf, *new; |
| 1517 | __be32 status; |
| 1518 | unsigned int strhashval; |
| 1519 | char dname[HEXDIR_LEN]; |
| 1520 | char addr_str[INET6_ADDRSTRLEN]; |
| 1521 | nfs4_verifier verf = exid->verifier; |
| 1522 | struct sockaddr *sa = svc_addr(rqstp); |
| 1523 | |
| 1524 | rpc_ntop(sa, addr_str, sizeof(addr_str)); |
| 1525 | dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " |
| 1526 | "ip_addr=%s flags %x, spa_how %d\n", |
| 1527 | __func__, rqstp, exid, exid->clname.len, exid->clname.data, |
| 1528 | addr_str, exid->flags, exid->spa_how); |
| 1529 | |
| 1530 | if (exid->flags & ~EXCHGID4_FLAG_MASK_A) |
| 1531 | return nfserr_inval; |
| 1532 | |
| 1533 | /* Currently only support SP4_NONE */ |
| 1534 | switch (exid->spa_how) { |
| 1535 | case SP4_NONE: |
| 1536 | break; |
| 1537 | case SP4_SSV: |
| 1538 | return nfserr_serverfault; |
| 1539 | default: |
| 1540 | BUG(); /* checked by xdr code */ |
| 1541 | case SP4_MACH_CRED: |
| 1542 | return nfserr_serverfault; /* no excuse :-/ */ |
| 1543 | } |
| 1544 | |
| 1545 | status = nfs4_make_rec_clidname(dname, &exid->clname); |
| 1546 | |
| 1547 | if (status) |
| 1548 | return status; |
| 1549 | |
| 1550 | strhashval = clientstr_hashval(dname); |
| 1551 | |
| 1552 | nfs4_lock_state(); |
| 1553 | conf = find_confirmed_client_by_str(dname, strhashval); |
| 1554 | if (conf) { |
| 1555 | if (!clp_used_exchangeid(conf)) { |
| 1556 | if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { |
| 1557 | status = nfserr_inval; /* buggy client */ |
| 1558 | goto out; |
| 1559 | } |
| 1560 | } |
| 1561 | if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { |
| 1562 | /* 18.35.4 case 9 */ |
| 1563 | if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) |
| 1564 | status = nfserr_perm; |
| 1565 | else /* case 3 */ |
| 1566 | status = nfserr_clid_inuse; |
| 1567 | goto out; |
| 1568 | } |
| 1569 | if (!same_verf(&verf, &conf->cl_verifier)) { |
| 1570 | /* 18.35.4 case 8 */ |
| 1571 | if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { |
| 1572 | status = nfserr_not_same; |
| 1573 | goto out; |
| 1574 | } |
| 1575 | /* Client reboot: destroy old state */ |
| 1576 | expire_client(conf); |
| 1577 | goto out_new; |
| 1578 | } |
| 1579 | if (!clp_used_exchangeid(conf)) { |
| 1580 | status = nfserr_inval; |
| 1581 | goto out; |
| 1582 | } |
| 1583 | /* |
| 1584 | * Set bit when the owner id and verifier map to an already |
| 1585 | * confirmed client id (18.35.3). |
| 1586 | */ |
| 1587 | exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; |
| 1588 | |
| 1589 | /* |
| 1590 | * Falling into 18.35.4 case 2, possible router replay. |
| 1591 | * Leave confirmed record intact and return same result. |
| 1592 | */ |
| 1593 | new = conf; |
| 1594 | goto out_copy; |
| 1595 | } |
| 1596 | |
| 1597 | /* 18.35.4 case 7 */ |
| 1598 | if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { |
| 1599 | status = nfserr_noent; |
| 1600 | goto out; |
| 1601 | } |
| 1602 | |
| 1603 | unconf = find_unconfirmed_client_by_str(dname, strhashval); |
| 1604 | if (unconf) { |
| 1605 | /* |
| 1606 | * Possible retry or client restart. Per 18.35.4 case 4, |
| 1607 | * a new unconfirmed record should be generated regardless |
| 1608 | * of whether any properties have changed. |
| 1609 | */ |
| 1610 | expire_client(unconf); |
| 1611 | } |
| 1612 | |
| 1613 | out_new: |
| 1614 | /* Normal case */ |
| 1615 | new = create_client(exid->clname, dname, rqstp, &verf); |
| 1616 | if (new == NULL) { |
| 1617 | status = nfserr_jukebox; |
| 1618 | goto out; |
| 1619 | } |
| 1620 | |
| 1621 | gen_clid(new); |
| 1622 | add_to_unconfirmed(new, strhashval); |
| 1623 | out_copy: |
| 1624 | exid->clientid.cl_boot = new->cl_clientid.cl_boot; |
| 1625 | exid->clientid.cl_id = new->cl_clientid.cl_id; |
| 1626 | |
| 1627 | exid->seqid = 1; |
| 1628 | nfsd4_set_ex_flags(new, exid); |
| 1629 | |
| 1630 | dprintk("nfsd4_exchange_id seqid %d flags %x\n", |
| 1631 | new->cl_cs_slot.sl_seqid, new->cl_exchange_flags); |
| 1632 | status = nfs_ok; |
| 1633 | |
| 1634 | out: |
| 1635 | nfs4_unlock_state(); |
| 1636 | return status; |
| 1637 | } |
| 1638 | |
| 1639 | static __be32 |
| 1640 | check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) |
| 1641 | { |
| 1642 | dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, |
| 1643 | slot_seqid); |
| 1644 | |
| 1645 | /* The slot is in use, and no response has been sent. */ |
| 1646 | if (slot_inuse) { |
| 1647 | if (seqid == slot_seqid) |
| 1648 | return nfserr_jukebox; |
| 1649 | else |
| 1650 | return nfserr_seq_misordered; |
| 1651 | } |
| 1652 | /* Note unsigned 32-bit arithmetic handles wraparound: */ |
| 1653 | if (likely(seqid == slot_seqid + 1)) |
| 1654 | return nfs_ok; |
| 1655 | if (seqid == slot_seqid) |
| 1656 | return nfserr_replay_cache; |
| 1657 | return nfserr_seq_misordered; |
| 1658 | } |
| 1659 | |
| 1660 | /* |
| 1661 | * Cache the create session result into the create session single DRC |
| 1662 | * slot cache by saving the xdr structure. sl_seqid has been set. |
| 1663 | * Do this for solo or embedded create session operations. |
| 1664 | */ |
| 1665 | static void |
| 1666 | nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, |
| 1667 | struct nfsd4_clid_slot *slot, __be32 nfserr) |
| 1668 | { |
| 1669 | slot->sl_status = nfserr; |
| 1670 | memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); |
| 1671 | } |
| 1672 | |
| 1673 | static __be32 |
| 1674 | nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, |
| 1675 | struct nfsd4_clid_slot *slot) |
| 1676 | { |
| 1677 | memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); |
| 1678 | return slot->sl_status; |
| 1679 | } |
| 1680 | |
| 1681 | #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\ |
| 1682 | 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \ |
| 1683 | 1 + /* MIN tag is length with zero, only length */ \ |
| 1684 | 3 + /* version, opcount, opcode */ \ |
| 1685 | XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ |
| 1686 | /* seqid, slotID, slotID, cache */ \ |
| 1687 | 4 ) * sizeof(__be32)) |
| 1688 | |
| 1689 | #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\ |
| 1690 | 2 + /* verifier: AUTH_NULL, length 0 */\ |
| 1691 | 1 + /* status */ \ |
| 1692 | 1 + /* MIN tag is length with zero, only length */ \ |
| 1693 | 3 + /* opcount, opcode, opstatus*/ \ |
| 1694 | XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ |
| 1695 | /* seqid, slotID, slotID, slotID, status */ \ |
| 1696 | 5 ) * sizeof(__be32)) |
| 1697 | |
| 1698 | static bool check_forechannel_attrs(struct nfsd4_channel_attrs fchannel) |
| 1699 | { |
| 1700 | return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ |
| 1701 | || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ; |
| 1702 | } |
| 1703 | |
| 1704 | __be32 |
| 1705 | nfsd4_create_session(struct svc_rqst *rqstp, |
| 1706 | struct nfsd4_compound_state *cstate, |
| 1707 | struct nfsd4_create_session *cr_ses) |
| 1708 | { |
| 1709 | struct sockaddr *sa = svc_addr(rqstp); |
| 1710 | struct nfs4_client *conf, *unconf; |
| 1711 | struct nfsd4_session *new; |
| 1712 | struct nfsd4_clid_slot *cs_slot = NULL; |
| 1713 | bool confirm_me = false; |
| 1714 | __be32 status = 0; |
| 1715 | |
| 1716 | if (cr_ses->flags & ~SESSION4_FLAG_MASK_A) |
| 1717 | return nfserr_inval; |
| 1718 | |
| 1719 | nfs4_lock_state(); |
| 1720 | unconf = find_unconfirmed_client(&cr_ses->clientid); |
| 1721 | conf = find_confirmed_client(&cr_ses->clientid); |
| 1722 | |
| 1723 | if (conf) { |
| 1724 | cs_slot = &conf->cl_cs_slot; |
| 1725 | status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); |
| 1726 | if (status == nfserr_replay_cache) { |
| 1727 | dprintk("Got a create_session replay! seqid= %d\n", |
| 1728 | cs_slot->sl_seqid); |
| 1729 | /* Return the cached reply status */ |
| 1730 | status = nfsd4_replay_create_session(cr_ses, cs_slot); |
| 1731 | goto out; |
| 1732 | } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) { |
| 1733 | status = nfserr_seq_misordered; |
| 1734 | dprintk("Sequence misordered!\n"); |
| 1735 | dprintk("Expected seqid= %d but got seqid= %d\n", |
| 1736 | cs_slot->sl_seqid, cr_ses->seqid); |
| 1737 | goto out; |
| 1738 | } |
| 1739 | } else if (unconf) { |
| 1740 | if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || |
| 1741 | !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { |
| 1742 | status = nfserr_clid_inuse; |
| 1743 | goto out; |
| 1744 | } |
| 1745 | |
| 1746 | cs_slot = &unconf->cl_cs_slot; |
| 1747 | status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); |
| 1748 | if (status) { |
| 1749 | /* an unconfirmed replay returns misordered */ |
| 1750 | status = nfserr_seq_misordered; |
| 1751 | goto out; |
| 1752 | } |
| 1753 | |
| 1754 | confirm_me = true; |
| 1755 | conf = unconf; |
| 1756 | } else { |
| 1757 | status = nfserr_stale_clientid; |
| 1758 | goto out; |
| 1759 | } |
| 1760 | |
| 1761 | /* |
| 1762 | * XXX: we should probably set this at creation time, and check |
| 1763 | * for consistent minorversion use throughout: |
| 1764 | */ |
| 1765 | conf->cl_minorversion = 1; |
| 1766 | /* |
| 1767 | * We do not support RDMA or persistent sessions |
| 1768 | */ |
| 1769 | cr_ses->flags &= ~SESSION4_PERSIST; |
| 1770 | cr_ses->flags &= ~SESSION4_RDMA; |
| 1771 | |
| 1772 | status = nfserr_toosmall; |
| 1773 | if (check_forechannel_attrs(cr_ses->fore_channel)) |
| 1774 | goto out; |
| 1775 | |
| 1776 | status = nfserr_jukebox; |
| 1777 | new = alloc_init_session(rqstp, conf, cr_ses); |
| 1778 | if (!new) |
| 1779 | goto out; |
| 1780 | status = nfs_ok; |
| 1781 | memcpy(cr_ses->sessionid.data, new->se_sessionid.data, |
| 1782 | NFS4_MAX_SESSIONID_LEN); |
| 1783 | memcpy(&cr_ses->fore_channel, &new->se_fchannel, |
| 1784 | sizeof(struct nfsd4_channel_attrs)); |
| 1785 | cs_slot->sl_seqid++; |
| 1786 | cr_ses->seqid = cs_slot->sl_seqid; |
| 1787 | |
| 1788 | /* cache solo and embedded create sessions under the state lock */ |
| 1789 | nfsd4_cache_create_session(cr_ses, cs_slot, status); |
| 1790 | if (confirm_me) |
| 1791 | move_to_confirmed(conf); |
| 1792 | out: |
| 1793 | nfs4_unlock_state(); |
| 1794 | dprintk("%s returns %d\n", __func__, ntohl(status)); |
| 1795 | return status; |
| 1796 | } |
| 1797 | |
| 1798 | static bool nfsd4_last_compound_op(struct svc_rqst *rqstp) |
| 1799 | { |
| 1800 | struct nfsd4_compoundres *resp = rqstp->rq_resp; |
| 1801 | struct nfsd4_compoundargs *argp = rqstp->rq_argp; |
| 1802 | |
| 1803 | return argp->opcnt == resp->opcnt; |
| 1804 | } |
| 1805 | |
| 1806 | static __be32 nfsd4_map_bcts_dir(u32 *dir) |
| 1807 | { |
| 1808 | switch (*dir) { |
| 1809 | case NFS4_CDFC4_FORE: |
| 1810 | case NFS4_CDFC4_BACK: |
| 1811 | return nfs_ok; |
| 1812 | case NFS4_CDFC4_FORE_OR_BOTH: |
| 1813 | case NFS4_CDFC4_BACK_OR_BOTH: |
| 1814 | *dir = NFS4_CDFC4_BOTH; |
| 1815 | return nfs_ok; |
| 1816 | }; |
| 1817 | return nfserr_inval; |
| 1818 | } |
| 1819 | |
| 1820 | __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, |
| 1821 | struct nfsd4_compound_state *cstate, |
| 1822 | struct nfsd4_bind_conn_to_session *bcts) |
| 1823 | { |
| 1824 | __be32 status; |
| 1825 | |
| 1826 | if (!nfsd4_last_compound_op(rqstp)) |
| 1827 | return nfserr_not_only_op; |
| 1828 | spin_lock(&client_lock); |
| 1829 | cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid); |
| 1830 | /* Sorta weird: we only need the refcnt'ing because new_conn acquires |
| 1831 | * client_lock iself: */ |
| 1832 | if (cstate->session) { |
| 1833 | nfsd4_get_session(cstate->session); |
| 1834 | atomic_inc(&cstate->session->se_client->cl_refcount); |
| 1835 | } |
| 1836 | spin_unlock(&client_lock); |
| 1837 | if (!cstate->session) |
| 1838 | return nfserr_badsession; |
| 1839 | |
| 1840 | status = nfsd4_map_bcts_dir(&bcts->dir); |
| 1841 | if (!status) |
| 1842 | nfsd4_new_conn(rqstp, cstate->session, bcts->dir); |
| 1843 | return status; |
| 1844 | } |
| 1845 | |
| 1846 | static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) |
| 1847 | { |
| 1848 | if (!session) |
| 1849 | return 0; |
| 1850 | return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); |
| 1851 | } |
| 1852 | |
| 1853 | __be32 |
| 1854 | nfsd4_destroy_session(struct svc_rqst *r, |
| 1855 | struct nfsd4_compound_state *cstate, |
| 1856 | struct nfsd4_destroy_session *sessionid) |
| 1857 | { |
| 1858 | struct nfsd4_session *ses; |
| 1859 | __be32 status = nfserr_badsession; |
| 1860 | |
| 1861 | /* Notes: |
| 1862 | * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid |
| 1863 | * - Should we return nfserr_back_chan_busy if waiting for |
| 1864 | * callbacks on to-be-destroyed session? |
| 1865 | * - Do we need to clear any callback info from previous session? |
| 1866 | */ |
| 1867 | |
| 1868 | if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { |
| 1869 | if (!nfsd4_last_compound_op(r)) |
| 1870 | return nfserr_not_only_op; |
| 1871 | } |
| 1872 | dump_sessionid(__func__, &sessionid->sessionid); |
| 1873 | spin_lock(&client_lock); |
| 1874 | ses = find_in_sessionid_hashtbl(&sessionid->sessionid); |
| 1875 | if (!ses) { |
| 1876 | spin_unlock(&client_lock); |
| 1877 | goto out; |
| 1878 | } |
| 1879 | |
| 1880 | unhash_session(ses); |
| 1881 | spin_unlock(&client_lock); |
| 1882 | |
| 1883 | nfs4_lock_state(); |
| 1884 | nfsd4_probe_callback_sync(ses->se_client); |
| 1885 | nfs4_unlock_state(); |
| 1886 | |
| 1887 | spin_lock(&client_lock); |
| 1888 | nfsd4_del_conns(ses); |
| 1889 | nfsd4_put_session_locked(ses); |
| 1890 | spin_unlock(&client_lock); |
| 1891 | status = nfs_ok; |
| 1892 | out: |
| 1893 | dprintk("%s returns %d\n", __func__, ntohl(status)); |
| 1894 | return status; |
| 1895 | } |
| 1896 | |
| 1897 | static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) |
| 1898 | { |
| 1899 | struct nfsd4_conn *c; |
| 1900 | |
| 1901 | list_for_each_entry(c, &s->se_conns, cn_persession) { |
| 1902 | if (c->cn_xprt == xpt) { |
| 1903 | return c; |
| 1904 | } |
| 1905 | } |
| 1906 | return NULL; |
| 1907 | } |
| 1908 | |
| 1909 | static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) |
| 1910 | { |
| 1911 | struct nfs4_client *clp = ses->se_client; |
| 1912 | struct nfsd4_conn *c; |
| 1913 | int ret; |
| 1914 | |
| 1915 | spin_lock(&clp->cl_lock); |
| 1916 | c = __nfsd4_find_conn(new->cn_xprt, ses); |
| 1917 | if (c) { |
| 1918 | spin_unlock(&clp->cl_lock); |
| 1919 | free_conn(new); |
| 1920 | return; |
| 1921 | } |
| 1922 | __nfsd4_hash_conn(new, ses); |
| 1923 | spin_unlock(&clp->cl_lock); |
| 1924 | ret = nfsd4_register_conn(new); |
| 1925 | if (ret) |
| 1926 | /* oops; xprt is already down: */ |
| 1927 | nfsd4_conn_lost(&new->cn_xpt_user); |
| 1928 | return; |
| 1929 | } |
| 1930 | |
| 1931 | static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session) |
| 1932 | { |
| 1933 | struct nfsd4_compoundargs *args = rqstp->rq_argp; |
| 1934 | |
| 1935 | return args->opcnt > session->se_fchannel.maxops; |
| 1936 | } |
| 1937 | |
| 1938 | static bool nfsd4_request_too_big(struct svc_rqst *rqstp, |
| 1939 | struct nfsd4_session *session) |
| 1940 | { |
| 1941 | struct xdr_buf *xb = &rqstp->rq_arg; |
| 1942 | |
| 1943 | return xb->len > session->se_fchannel.maxreq_sz; |
| 1944 | } |
| 1945 | |
| 1946 | __be32 |
| 1947 | nfsd4_sequence(struct svc_rqst *rqstp, |
| 1948 | struct nfsd4_compound_state *cstate, |
| 1949 | struct nfsd4_sequence *seq) |
| 1950 | { |
| 1951 | struct nfsd4_compoundres *resp = rqstp->rq_resp; |
| 1952 | struct nfsd4_session *session; |
| 1953 | struct nfsd4_slot *slot; |
| 1954 | struct nfsd4_conn *conn; |
| 1955 | __be32 status; |
| 1956 | |
| 1957 | if (resp->opcnt != 1) |
| 1958 | return nfserr_sequence_pos; |
| 1959 | |
| 1960 | /* |
| 1961 | * Will be either used or freed by nfsd4_sequence_check_conn |
| 1962 | * below. |
| 1963 | */ |
| 1964 | conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); |
| 1965 | if (!conn) |
| 1966 | return nfserr_jukebox; |
| 1967 | |
| 1968 | spin_lock(&client_lock); |
| 1969 | status = nfserr_badsession; |
| 1970 | session = find_in_sessionid_hashtbl(&seq->sessionid); |
| 1971 | if (!session) |
| 1972 | goto out; |
| 1973 | |
| 1974 | status = nfserr_too_many_ops; |
| 1975 | if (nfsd4_session_too_many_ops(rqstp, session)) |
| 1976 | goto out; |
| 1977 | |
| 1978 | status = nfserr_req_too_big; |
| 1979 | if (nfsd4_request_too_big(rqstp, session)) |
| 1980 | goto out; |
| 1981 | |
| 1982 | status = nfserr_badslot; |
| 1983 | if (seq->slotid >= session->se_fchannel.maxreqs) |
| 1984 | goto out; |
| 1985 | |
| 1986 | slot = session->se_slots[seq->slotid]; |
| 1987 | dprintk("%s: slotid %d\n", __func__, seq->slotid); |
| 1988 | |
| 1989 | /* We do not negotiate the number of slots yet, so set the |
| 1990 | * maxslots to the session maxreqs which is used to encode |
| 1991 | * sr_highest_slotid and the sr_target_slot id to maxslots */ |
| 1992 | seq->maxslots = session->se_fchannel.maxreqs; |
| 1993 | |
| 1994 | status = check_slot_seqid(seq->seqid, slot->sl_seqid, |
| 1995 | slot->sl_flags & NFSD4_SLOT_INUSE); |
| 1996 | if (status == nfserr_replay_cache) { |
| 1997 | status = nfserr_seq_misordered; |
| 1998 | if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED)) |
| 1999 | goto out; |
| 2000 | cstate->slot = slot; |
| 2001 | cstate->session = session; |
| 2002 | /* Return the cached reply status and set cstate->status |
| 2003 | * for nfsd4_proc_compound processing */ |
| 2004 | status = nfsd4_replay_cache_entry(resp, seq); |
| 2005 | cstate->status = nfserr_replay_cache; |
| 2006 | goto out; |
| 2007 | } |
| 2008 | if (status) |
| 2009 | goto out; |
| 2010 | |
| 2011 | nfsd4_sequence_check_conn(conn, session); |
| 2012 | conn = NULL; |
| 2013 | |
| 2014 | /* Success! bump slot seqid */ |
| 2015 | slot->sl_seqid = seq->seqid; |
| 2016 | slot->sl_flags |= NFSD4_SLOT_INUSE; |
| 2017 | if (seq->cachethis) |
| 2018 | slot->sl_flags |= NFSD4_SLOT_CACHETHIS; |
| 2019 | else |
| 2020 | slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS; |
| 2021 | |
| 2022 | cstate->slot = slot; |
| 2023 | cstate->session = session; |
| 2024 | |
| 2025 | out: |
| 2026 | /* Hold a session reference until done processing the compound. */ |
| 2027 | if (cstate->session) { |
| 2028 | struct nfs4_client *clp = session->se_client; |
| 2029 | |
| 2030 | nfsd4_get_session(cstate->session); |
| 2031 | atomic_inc(&clp->cl_refcount); |
| 2032 | switch (clp->cl_cb_state) { |
| 2033 | case NFSD4_CB_DOWN: |
| 2034 | seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN; |
| 2035 | break; |
| 2036 | case NFSD4_CB_FAULT: |
| 2037 | seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT; |
| 2038 | break; |
| 2039 | default: |
| 2040 | seq->status_flags = 0; |
| 2041 | } |
| 2042 | } |
| 2043 | kfree(conn); |
| 2044 | spin_unlock(&client_lock); |
| 2045 | dprintk("%s: return %d\n", __func__, ntohl(status)); |
| 2046 | return status; |
| 2047 | } |
| 2048 | |
| 2049 | static inline bool has_resources(struct nfs4_client *clp) |
| 2050 | { |
| 2051 | return !list_empty(&clp->cl_openowners) |
| 2052 | || !list_empty(&clp->cl_delegations) |
| 2053 | || !list_empty(&clp->cl_sessions); |
| 2054 | } |
| 2055 | |
| 2056 | __be32 |
| 2057 | nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc) |
| 2058 | { |
| 2059 | struct nfs4_client *conf, *unconf, *clp; |
| 2060 | __be32 status = 0; |
| 2061 | |
| 2062 | nfs4_lock_state(); |
| 2063 | unconf = find_unconfirmed_client(&dc->clientid); |
| 2064 | conf = find_confirmed_client(&dc->clientid); |
| 2065 | |
| 2066 | if (conf) { |
| 2067 | clp = conf; |
| 2068 | |
| 2069 | if (!is_client_expired(conf) && has_resources(conf)) { |
| 2070 | status = nfserr_clientid_busy; |
| 2071 | goto out; |
| 2072 | } |
| 2073 | |
| 2074 | /* rfc5661 18.50.3 */ |
| 2075 | if (cstate->session && conf == cstate->session->se_client) { |
| 2076 | status = nfserr_clientid_busy; |
| 2077 | goto out; |
| 2078 | } |
| 2079 | } else if (unconf) |
| 2080 | clp = unconf; |
| 2081 | else { |
| 2082 | status = nfserr_stale_clientid; |
| 2083 | goto out; |
| 2084 | } |
| 2085 | |
| 2086 | expire_client(clp); |
| 2087 | out: |
| 2088 | nfs4_unlock_state(); |
| 2089 | dprintk("%s return %d\n", __func__, ntohl(status)); |
| 2090 | return status; |
| 2091 | } |
| 2092 | |
| 2093 | __be32 |
| 2094 | nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc) |
| 2095 | { |
| 2096 | __be32 status = 0; |
| 2097 | |
| 2098 | if (rc->rca_one_fs) { |
| 2099 | if (!cstate->current_fh.fh_dentry) |
| 2100 | return nfserr_nofilehandle; |
| 2101 | /* |
| 2102 | * We don't take advantage of the rca_one_fs case. |
| 2103 | * That's OK, it's optional, we can safely ignore it. |
| 2104 | */ |
| 2105 | return nfs_ok; |
| 2106 | } |
| 2107 | |
| 2108 | nfs4_lock_state(); |
| 2109 | status = nfserr_complete_already; |
| 2110 | if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, |
| 2111 | &cstate->session->se_client->cl_flags)) |
| 2112 | goto out; |
| 2113 | |
| 2114 | status = nfserr_stale_clientid; |
| 2115 | if (is_client_expired(cstate->session->se_client)) |
| 2116 | /* |
| 2117 | * The following error isn't really legal. |
| 2118 | * But we only get here if the client just explicitly |
| 2119 | * destroyed the client. Surely it no longer cares what |
| 2120 | * error it gets back on an operation for the dead |
| 2121 | * client. |
| 2122 | */ |
| 2123 | goto out; |
| 2124 | |
| 2125 | status = nfs_ok; |
| 2126 | nfsd4_client_record_create(cstate->session->se_client); |
| 2127 | out: |
| 2128 | nfs4_unlock_state(); |
| 2129 | return status; |
| 2130 | } |
| 2131 | |
| 2132 | __be32 |
| 2133 | nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 2134 | struct nfsd4_setclientid *setclid) |
| 2135 | { |
| 2136 | struct xdr_netobj clname = setclid->se_name; |
| 2137 | nfs4_verifier clverifier = setclid->se_verf; |
| 2138 | unsigned int strhashval; |
| 2139 | struct nfs4_client *conf, *unconf, *new; |
| 2140 | __be32 status; |
| 2141 | char dname[HEXDIR_LEN]; |
| 2142 | |
| 2143 | status = nfs4_make_rec_clidname(dname, &clname); |
| 2144 | if (status) |
| 2145 | return status; |
| 2146 | |
| 2147 | /* |
| 2148 | * XXX The Duplicate Request Cache (DRC) has been checked (??) |
| 2149 | * We get here on a DRC miss. |
| 2150 | */ |
| 2151 | |
| 2152 | strhashval = clientstr_hashval(dname); |
| 2153 | |
| 2154 | nfs4_lock_state(); |
| 2155 | conf = find_confirmed_client_by_str(dname, strhashval); |
| 2156 | if (conf) { |
| 2157 | /* RFC 3530 14.2.33 CASE 0: */ |
| 2158 | status = nfserr_clid_inuse; |
| 2159 | if (clp_used_exchangeid(conf)) |
| 2160 | goto out; |
| 2161 | if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { |
| 2162 | char addr_str[INET6_ADDRSTRLEN]; |
| 2163 | rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, |
| 2164 | sizeof(addr_str)); |
| 2165 | dprintk("NFSD: setclientid: string in use by client " |
| 2166 | "at %s\n", addr_str); |
| 2167 | goto out; |
| 2168 | } |
| 2169 | } |
| 2170 | /* |
| 2171 | * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION") |
| 2172 | * has a description of SETCLIENTID request processing consisting |
| 2173 | * of 5 bullet points, labeled as CASE0 - CASE4 below. |
| 2174 | */ |
| 2175 | unconf = find_unconfirmed_client_by_str(dname, strhashval); |
| 2176 | status = nfserr_jukebox; |
| 2177 | if (!conf) { |
| 2178 | /* |
| 2179 | * RFC 3530 14.2.33 CASE 4: |
| 2180 | * placed first, because it is the normal case |
| 2181 | */ |
| 2182 | if (unconf) |
| 2183 | expire_client(unconf); |
| 2184 | new = create_client(clname, dname, rqstp, &clverifier); |
| 2185 | if (new == NULL) |
| 2186 | goto out; |
| 2187 | gen_clid(new); |
| 2188 | } else if (same_verf(&conf->cl_verifier, &clverifier)) { |
| 2189 | /* |
| 2190 | * RFC 3530 14.2.33 CASE 1: |
| 2191 | * probable callback update |
| 2192 | */ |
| 2193 | if (unconf) { |
| 2194 | /* Note this is removing unconfirmed {*x***}, |
| 2195 | * which is stronger than RFC recommended {vxc**}. |
| 2196 | * This has the advantage that there is at most |
| 2197 | * one {*x***} in either list at any time. |
| 2198 | */ |
| 2199 | expire_client(unconf); |
| 2200 | } |
| 2201 | new = create_client(clname, dname, rqstp, &clverifier); |
| 2202 | if (new == NULL) |
| 2203 | goto out; |
| 2204 | copy_clid(new, conf); |
| 2205 | } else if (!unconf) { |
| 2206 | /* |
| 2207 | * RFC 3530 14.2.33 CASE 2: |
| 2208 | * probable client reboot; state will be removed if |
| 2209 | * confirmed. |
| 2210 | */ |
| 2211 | new = create_client(clname, dname, rqstp, &clverifier); |
| 2212 | if (new == NULL) |
| 2213 | goto out; |
| 2214 | gen_clid(new); |
| 2215 | } else { |
| 2216 | /* |
| 2217 | * RFC 3530 14.2.33 CASE 3: |
| 2218 | * probable client reboot; state will be removed if |
| 2219 | * confirmed. |
| 2220 | */ |
| 2221 | expire_client(unconf); |
| 2222 | new = create_client(clname, dname, rqstp, &clverifier); |
| 2223 | if (new == NULL) |
| 2224 | goto out; |
| 2225 | gen_clid(new); |
| 2226 | } |
| 2227 | /* |
| 2228 | * XXX: we should probably set this at creation time, and check |
| 2229 | * for consistent minorversion use throughout: |
| 2230 | */ |
| 2231 | new->cl_minorversion = 0; |
| 2232 | gen_callback(new, setclid, rqstp); |
| 2233 | add_to_unconfirmed(new, strhashval); |
| 2234 | setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; |
| 2235 | setclid->se_clientid.cl_id = new->cl_clientid.cl_id; |
| 2236 | memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); |
| 2237 | status = nfs_ok; |
| 2238 | out: |
| 2239 | nfs4_unlock_state(); |
| 2240 | return status; |
| 2241 | } |
| 2242 | |
| 2243 | |
| 2244 | /* |
| 2245 | * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has |
| 2246 | * a description of SETCLIENTID_CONFIRM request processing consisting of 4 |
| 2247 | * bullets, labeled as CASE1 - CASE4 below. |
| 2248 | */ |
| 2249 | __be32 |
| 2250 | nfsd4_setclientid_confirm(struct svc_rqst *rqstp, |
| 2251 | struct nfsd4_compound_state *cstate, |
| 2252 | struct nfsd4_setclientid_confirm *setclientid_confirm) |
| 2253 | { |
| 2254 | struct nfs4_client *conf, *unconf; |
| 2255 | nfs4_verifier confirm = setclientid_confirm->sc_confirm; |
| 2256 | clientid_t * clid = &setclientid_confirm->sc_clientid; |
| 2257 | __be32 status; |
| 2258 | |
| 2259 | if (STALE_CLIENTID(clid)) |
| 2260 | return nfserr_stale_clientid; |
| 2261 | /* |
| 2262 | * XXX The Duplicate Request Cache (DRC) has been checked (??) |
| 2263 | * We get here on a DRC miss. |
| 2264 | */ |
| 2265 | |
| 2266 | nfs4_lock_state(); |
| 2267 | |
| 2268 | conf = find_confirmed_client(clid); |
| 2269 | unconf = find_unconfirmed_client(clid); |
| 2270 | |
| 2271 | /* |
| 2272 | * section 14.2.34 of RFC 3530 has a description of |
| 2273 | * SETCLIENTID_CONFIRM request processing consisting |
| 2274 | * of 4 bullet points, labeled as CASE1 - CASE4 below. |
| 2275 | */ |
| 2276 | status = nfserr_clid_inuse; |
| 2277 | if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) { |
| 2278 | /* |
| 2279 | * RFC 3530 14.2.34 CASE 1: |
| 2280 | * callback update |
| 2281 | */ |
| 2282 | if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) |
| 2283 | status = nfserr_clid_inuse; |
| 2284 | else { |
| 2285 | nfsd4_change_callback(conf, &unconf->cl_cb_conn); |
| 2286 | nfsd4_probe_callback(conf); |
| 2287 | expire_client(unconf); |
| 2288 | status = nfs_ok; |
| 2289 | } |
| 2290 | } else if (conf && !unconf) { |
| 2291 | /* |
| 2292 | * RFC 3530 14.2.34 CASE 2: |
| 2293 | * probable retransmitted request; play it safe and |
| 2294 | * do nothing. |
| 2295 | */ |
| 2296 | if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) |
| 2297 | status = nfserr_clid_inuse; |
| 2298 | else |
| 2299 | status = nfs_ok; |
| 2300 | } else if (!conf && unconf |
| 2301 | && same_verf(&unconf->cl_confirm, &confirm)) { |
| 2302 | /* |
| 2303 | * RFC 3530 14.2.34 CASE 3: |
| 2304 | * Normal case; new or rebooted client: |
| 2305 | */ |
| 2306 | if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { |
| 2307 | status = nfserr_clid_inuse; |
| 2308 | } else { |
| 2309 | unsigned int hash = |
| 2310 | clientstr_hashval(unconf->cl_recdir); |
| 2311 | conf = find_confirmed_client_by_str(unconf->cl_recdir, |
| 2312 | hash); |
| 2313 | if (conf) { |
| 2314 | nfsd4_client_record_remove(conf); |
| 2315 | expire_client(conf); |
| 2316 | } |
| 2317 | move_to_confirmed(unconf); |
| 2318 | conf = unconf; |
| 2319 | nfsd4_probe_callback(conf); |
| 2320 | status = nfs_ok; |
| 2321 | } |
| 2322 | } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) |
| 2323 | && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, |
| 2324 | &confirm)))) { |
| 2325 | /* |
| 2326 | * RFC 3530 14.2.34 CASE 4: |
| 2327 | * Client probably hasn't noticed that we rebooted yet. |
| 2328 | */ |
| 2329 | status = nfserr_stale_clientid; |
| 2330 | } |
| 2331 | |
| 2332 | nfs4_unlock_state(); |
| 2333 | return status; |
| 2334 | } |
| 2335 | |
| 2336 | static struct nfs4_file *nfsd4_alloc_file(void) |
| 2337 | { |
| 2338 | return kmem_cache_alloc(file_slab, GFP_KERNEL); |
| 2339 | } |
| 2340 | |
| 2341 | /* OPEN Share state helper functions */ |
| 2342 | static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino) |
| 2343 | { |
| 2344 | unsigned int hashval = file_hashval(ino); |
| 2345 | |
| 2346 | atomic_set(&fp->fi_ref, 1); |
| 2347 | INIT_LIST_HEAD(&fp->fi_hash); |
| 2348 | INIT_LIST_HEAD(&fp->fi_stateids); |
| 2349 | INIT_LIST_HEAD(&fp->fi_delegations); |
| 2350 | fp->fi_inode = igrab(ino); |
| 2351 | fp->fi_had_conflict = false; |
| 2352 | fp->fi_lease = NULL; |
| 2353 | memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); |
| 2354 | memset(fp->fi_access, 0, sizeof(fp->fi_access)); |
| 2355 | spin_lock(&recall_lock); |
| 2356 | list_add(&fp->fi_hash, &file_hashtbl[hashval]); |
| 2357 | spin_unlock(&recall_lock); |
| 2358 | } |
| 2359 | |
| 2360 | static void |
| 2361 | nfsd4_free_slab(struct kmem_cache **slab) |
| 2362 | { |
| 2363 | if (*slab == NULL) |
| 2364 | return; |
| 2365 | kmem_cache_destroy(*slab); |
| 2366 | *slab = NULL; |
| 2367 | } |
| 2368 | |
| 2369 | void |
| 2370 | nfsd4_free_slabs(void) |
| 2371 | { |
| 2372 | nfsd4_free_slab(&openowner_slab); |
| 2373 | nfsd4_free_slab(&lockowner_slab); |
| 2374 | nfsd4_free_slab(&file_slab); |
| 2375 | nfsd4_free_slab(&stateid_slab); |
| 2376 | nfsd4_free_slab(&deleg_slab); |
| 2377 | } |
| 2378 | |
| 2379 | int |
| 2380 | nfsd4_init_slabs(void) |
| 2381 | { |
| 2382 | openowner_slab = kmem_cache_create("nfsd4_openowners", |
| 2383 | sizeof(struct nfs4_openowner), 0, 0, NULL); |
| 2384 | if (openowner_slab == NULL) |
| 2385 | goto out_nomem; |
| 2386 | lockowner_slab = kmem_cache_create("nfsd4_lockowners", |
| 2387 | sizeof(struct nfs4_openowner), 0, 0, NULL); |
| 2388 | if (lockowner_slab == NULL) |
| 2389 | goto out_nomem; |
| 2390 | file_slab = kmem_cache_create("nfsd4_files", |
| 2391 | sizeof(struct nfs4_file), 0, 0, NULL); |
| 2392 | if (file_slab == NULL) |
| 2393 | goto out_nomem; |
| 2394 | stateid_slab = kmem_cache_create("nfsd4_stateids", |
| 2395 | sizeof(struct nfs4_ol_stateid), 0, 0, NULL); |
| 2396 | if (stateid_slab == NULL) |
| 2397 | goto out_nomem; |
| 2398 | deleg_slab = kmem_cache_create("nfsd4_delegations", |
| 2399 | sizeof(struct nfs4_delegation), 0, 0, NULL); |
| 2400 | if (deleg_slab == NULL) |
| 2401 | goto out_nomem; |
| 2402 | return 0; |
| 2403 | out_nomem: |
| 2404 | nfsd4_free_slabs(); |
| 2405 | dprintk("nfsd4: out of memory while initializing nfsv4\n"); |
| 2406 | return -ENOMEM; |
| 2407 | } |
| 2408 | |
| 2409 | void nfs4_free_openowner(struct nfs4_openowner *oo) |
| 2410 | { |
| 2411 | kfree(oo->oo_owner.so_owner.data); |
| 2412 | kmem_cache_free(openowner_slab, oo); |
| 2413 | } |
| 2414 | |
| 2415 | void nfs4_free_lockowner(struct nfs4_lockowner *lo) |
| 2416 | { |
| 2417 | kfree(lo->lo_owner.so_owner.data); |
| 2418 | kmem_cache_free(lockowner_slab, lo); |
| 2419 | } |
| 2420 | |
| 2421 | static void init_nfs4_replay(struct nfs4_replay *rp) |
| 2422 | { |
| 2423 | rp->rp_status = nfserr_serverfault; |
| 2424 | rp->rp_buflen = 0; |
| 2425 | rp->rp_buf = rp->rp_ibuf; |
| 2426 | } |
| 2427 | |
| 2428 | static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp) |
| 2429 | { |
| 2430 | struct nfs4_stateowner *sop; |
| 2431 | |
| 2432 | sop = kmem_cache_alloc(slab, GFP_KERNEL); |
| 2433 | if (!sop) |
| 2434 | return NULL; |
| 2435 | |
| 2436 | sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL); |
| 2437 | if (!sop->so_owner.data) { |
| 2438 | kmem_cache_free(slab, sop); |
| 2439 | return NULL; |
| 2440 | } |
| 2441 | sop->so_owner.len = owner->len; |
| 2442 | |
| 2443 | INIT_LIST_HEAD(&sop->so_stateids); |
| 2444 | sop->so_client = clp; |
| 2445 | init_nfs4_replay(&sop->so_replay); |
| 2446 | return sop; |
| 2447 | } |
| 2448 | |
| 2449 | static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval) |
| 2450 | { |
| 2451 | list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]); |
| 2452 | list_add(&oo->oo_perclient, &clp->cl_openowners); |
| 2453 | } |
| 2454 | |
| 2455 | static struct nfs4_openowner * |
| 2456 | alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { |
| 2457 | struct nfs4_openowner *oo; |
| 2458 | |
| 2459 | oo = alloc_stateowner(openowner_slab, &open->op_owner, clp); |
| 2460 | if (!oo) |
| 2461 | return NULL; |
| 2462 | oo->oo_owner.so_is_open_owner = 1; |
| 2463 | oo->oo_owner.so_seqid = open->op_seqid; |
| 2464 | oo->oo_flags = NFS4_OO_NEW; |
| 2465 | oo->oo_time = 0; |
| 2466 | oo->oo_last_closed_stid = NULL; |
| 2467 | INIT_LIST_HEAD(&oo->oo_close_lru); |
| 2468 | hash_openowner(oo, clp, strhashval); |
| 2469 | return oo; |
| 2470 | } |
| 2471 | |
| 2472 | static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { |
| 2473 | struct nfs4_openowner *oo = open->op_openowner; |
| 2474 | struct nfs4_client *clp = oo->oo_owner.so_client; |
| 2475 | |
| 2476 | init_stid(&stp->st_stid, clp, NFS4_OPEN_STID); |
| 2477 | INIT_LIST_HEAD(&stp->st_lockowners); |
| 2478 | list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids); |
| 2479 | list_add(&stp->st_perfile, &fp->fi_stateids); |
| 2480 | stp->st_stateowner = &oo->oo_owner; |
| 2481 | get_nfs4_file(fp); |
| 2482 | stp->st_file = fp; |
| 2483 | stp->st_access_bmap = 0; |
| 2484 | stp->st_deny_bmap = 0; |
| 2485 | set_access(open->op_share_access, stp); |
| 2486 | set_deny(open->op_share_deny, stp); |
| 2487 | stp->st_openstp = NULL; |
| 2488 | } |
| 2489 | |
| 2490 | static void |
| 2491 | move_to_close_lru(struct nfs4_openowner *oo) |
| 2492 | { |
| 2493 | dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo); |
| 2494 | |
| 2495 | list_move_tail(&oo->oo_close_lru, &close_lru); |
| 2496 | oo->oo_time = get_seconds(); |
| 2497 | } |
| 2498 | |
| 2499 | static int |
| 2500 | same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, |
| 2501 | clientid_t *clid) |
| 2502 | { |
| 2503 | return (sop->so_owner.len == owner->len) && |
| 2504 | 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && |
| 2505 | (sop->so_client->cl_clientid.cl_id == clid->cl_id); |
| 2506 | } |
| 2507 | |
| 2508 | static struct nfs4_openowner * |
| 2509 | find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) |
| 2510 | { |
| 2511 | struct nfs4_stateowner *so; |
| 2512 | struct nfs4_openowner *oo; |
| 2513 | |
| 2514 | list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { |
| 2515 | if (!so->so_is_open_owner) |
| 2516 | continue; |
| 2517 | if (same_owner_str(so, &open->op_owner, &open->op_clientid)) { |
| 2518 | oo = openowner(so); |
| 2519 | renew_client(oo->oo_owner.so_client); |
| 2520 | return oo; |
| 2521 | } |
| 2522 | } |
| 2523 | return NULL; |
| 2524 | } |
| 2525 | |
| 2526 | /* search file_hashtbl[] for file */ |
| 2527 | static struct nfs4_file * |
| 2528 | find_file(struct inode *ino) |
| 2529 | { |
| 2530 | unsigned int hashval = file_hashval(ino); |
| 2531 | struct nfs4_file *fp; |
| 2532 | |
| 2533 | spin_lock(&recall_lock); |
| 2534 | list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { |
| 2535 | if (fp->fi_inode == ino) { |
| 2536 | get_nfs4_file(fp); |
| 2537 | spin_unlock(&recall_lock); |
| 2538 | return fp; |
| 2539 | } |
| 2540 | } |
| 2541 | spin_unlock(&recall_lock); |
| 2542 | return NULL; |
| 2543 | } |
| 2544 | |
| 2545 | /* |
| 2546 | * Called to check deny when READ with all zero stateid or |
| 2547 | * WRITE with all zero or all one stateid |
| 2548 | */ |
| 2549 | static __be32 |
| 2550 | nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) |
| 2551 | { |
| 2552 | struct inode *ino = current_fh->fh_dentry->d_inode; |
| 2553 | struct nfs4_file *fp; |
| 2554 | struct nfs4_ol_stateid *stp; |
| 2555 | __be32 ret; |
| 2556 | |
| 2557 | dprintk("NFSD: nfs4_share_conflict\n"); |
| 2558 | |
| 2559 | fp = find_file(ino); |
| 2560 | if (!fp) |
| 2561 | return nfs_ok; |
| 2562 | ret = nfserr_locked; |
| 2563 | /* Search for conflicting share reservations */ |
| 2564 | list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { |
| 2565 | if (test_deny(deny_type, stp) || |
| 2566 | test_deny(NFS4_SHARE_DENY_BOTH, stp)) |
| 2567 | goto out; |
| 2568 | } |
| 2569 | ret = nfs_ok; |
| 2570 | out: |
| 2571 | put_nfs4_file(fp); |
| 2572 | return ret; |
| 2573 | } |
| 2574 | |
| 2575 | static void nfsd_break_one_deleg(struct nfs4_delegation *dp) |
| 2576 | { |
| 2577 | /* We're assuming the state code never drops its reference |
| 2578 | * without first removing the lease. Since we're in this lease |
| 2579 | * callback (and since the lease code is serialized by the kernel |
| 2580 | * lock) we know the server hasn't removed the lease yet, we know |
| 2581 | * it's safe to take a reference: */ |
| 2582 | atomic_inc(&dp->dl_count); |
| 2583 | |
| 2584 | list_add_tail(&dp->dl_recall_lru, &del_recall_lru); |
| 2585 | |
| 2586 | /* only place dl_time is set. protected by lock_flocks*/ |
| 2587 | dp->dl_time = get_seconds(); |
| 2588 | |
| 2589 | nfsd4_cb_recall(dp); |
| 2590 | } |
| 2591 | |
| 2592 | /* Called from break_lease() with lock_flocks() held. */ |
| 2593 | static void nfsd_break_deleg_cb(struct file_lock *fl) |
| 2594 | { |
| 2595 | struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner; |
| 2596 | struct nfs4_delegation *dp; |
| 2597 | |
| 2598 | BUG_ON(!fp); |
| 2599 | /* We assume break_lease is only called once per lease: */ |
| 2600 | BUG_ON(fp->fi_had_conflict); |
| 2601 | /* |
| 2602 | * We don't want the locks code to timeout the lease for us; |
| 2603 | * we'll remove it ourself if a delegation isn't returned |
| 2604 | * in time: |
| 2605 | */ |
| 2606 | fl->fl_break_time = 0; |
| 2607 | |
| 2608 | spin_lock(&recall_lock); |
| 2609 | fp->fi_had_conflict = true; |
| 2610 | list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) |
| 2611 | nfsd_break_one_deleg(dp); |
| 2612 | spin_unlock(&recall_lock); |
| 2613 | } |
| 2614 | |
| 2615 | static |
| 2616 | int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) |
| 2617 | { |
| 2618 | if (arg & F_UNLCK) |
| 2619 | return lease_modify(onlist, arg); |
| 2620 | else |
| 2621 | return -EAGAIN; |
| 2622 | } |
| 2623 | |
| 2624 | static const struct lock_manager_operations nfsd_lease_mng_ops = { |
| 2625 | .lm_break = nfsd_break_deleg_cb, |
| 2626 | .lm_change = nfsd_change_deleg_cb, |
| 2627 | }; |
| 2628 | |
| 2629 | static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid) |
| 2630 | { |
| 2631 | if (nfsd4_has_session(cstate)) |
| 2632 | return nfs_ok; |
| 2633 | if (seqid == so->so_seqid - 1) |
| 2634 | return nfserr_replay_me; |
| 2635 | if (seqid == so->so_seqid) |
| 2636 | return nfs_ok; |
| 2637 | return nfserr_bad_seqid; |
| 2638 | } |
| 2639 | |
| 2640 | __be32 |
| 2641 | nfsd4_process_open1(struct nfsd4_compound_state *cstate, |
| 2642 | struct nfsd4_open *open) |
| 2643 | { |
| 2644 | clientid_t *clientid = &open->op_clientid; |
| 2645 | struct nfs4_client *clp = NULL; |
| 2646 | unsigned int strhashval; |
| 2647 | struct nfs4_openowner *oo = NULL; |
| 2648 | __be32 status; |
| 2649 | |
| 2650 | if (STALE_CLIENTID(&open->op_clientid)) |
| 2651 | return nfserr_stale_clientid; |
| 2652 | /* |
| 2653 | * In case we need it later, after we've already created the |
| 2654 | * file and don't want to risk a further failure: |
| 2655 | */ |
| 2656 | open->op_file = nfsd4_alloc_file(); |
| 2657 | if (open->op_file == NULL) |
| 2658 | return nfserr_jukebox; |
| 2659 | |
| 2660 | strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner); |
| 2661 | oo = find_openstateowner_str(strhashval, open); |
| 2662 | open->op_openowner = oo; |
| 2663 | if (!oo) { |
| 2664 | clp = find_confirmed_client(clientid); |
| 2665 | if (clp == NULL) |
| 2666 | return nfserr_expired; |
| 2667 | goto new_owner; |
| 2668 | } |
| 2669 | if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) { |
| 2670 | /* Replace unconfirmed owners without checking for replay. */ |
| 2671 | clp = oo->oo_owner.so_client; |
| 2672 | release_openowner(oo); |
| 2673 | open->op_openowner = NULL; |
| 2674 | goto new_owner; |
| 2675 | } |
| 2676 | status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid); |
| 2677 | if (status) |
| 2678 | return status; |
| 2679 | clp = oo->oo_owner.so_client; |
| 2680 | goto alloc_stateid; |
| 2681 | new_owner: |
| 2682 | oo = alloc_init_open_stateowner(strhashval, clp, open); |
| 2683 | if (oo == NULL) |
| 2684 | return nfserr_jukebox; |
| 2685 | open->op_openowner = oo; |
| 2686 | alloc_stateid: |
| 2687 | open->op_stp = nfs4_alloc_stateid(clp); |
| 2688 | if (!open->op_stp) |
| 2689 | return nfserr_jukebox; |
| 2690 | return nfs_ok; |
| 2691 | } |
| 2692 | |
| 2693 | static inline __be32 |
| 2694 | nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) |
| 2695 | { |
| 2696 | if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) |
| 2697 | return nfserr_openmode; |
| 2698 | else |
| 2699 | return nfs_ok; |
| 2700 | } |
| 2701 | |
| 2702 | static int share_access_to_flags(u32 share_access) |
| 2703 | { |
| 2704 | return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; |
| 2705 | } |
| 2706 | |
| 2707 | static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s) |
| 2708 | { |
| 2709 | struct nfs4_stid *ret; |
| 2710 | |
| 2711 | ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID); |
| 2712 | if (!ret) |
| 2713 | return NULL; |
| 2714 | return delegstateid(ret); |
| 2715 | } |
| 2716 | |
| 2717 | static bool nfsd4_is_deleg_cur(struct nfsd4_open *open) |
| 2718 | { |
| 2719 | return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR || |
| 2720 | open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH; |
| 2721 | } |
| 2722 | |
| 2723 | static __be32 |
| 2724 | nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open, |
| 2725 | struct nfs4_delegation **dp) |
| 2726 | { |
| 2727 | int flags; |
| 2728 | __be32 status = nfserr_bad_stateid; |
| 2729 | |
| 2730 | *dp = find_deleg_stateid(cl, &open->op_delegate_stateid); |
| 2731 | if (*dp == NULL) |
| 2732 | goto out; |
| 2733 | flags = share_access_to_flags(open->op_share_access); |
| 2734 | status = nfs4_check_delegmode(*dp, flags); |
| 2735 | if (status) |
| 2736 | *dp = NULL; |
| 2737 | out: |
| 2738 | if (!nfsd4_is_deleg_cur(open)) |
| 2739 | return nfs_ok; |
| 2740 | if (status) |
| 2741 | return status; |
| 2742 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; |
| 2743 | return nfs_ok; |
| 2744 | } |
| 2745 | |
| 2746 | static __be32 |
| 2747 | nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp) |
| 2748 | { |
| 2749 | struct nfs4_ol_stateid *local; |
| 2750 | struct nfs4_openowner *oo = open->op_openowner; |
| 2751 | |
| 2752 | list_for_each_entry(local, &fp->fi_stateids, st_perfile) { |
| 2753 | /* ignore lock owners */ |
| 2754 | if (local->st_stateowner->so_is_open_owner == 0) |
| 2755 | continue; |
| 2756 | /* remember if we have seen this open owner */ |
| 2757 | if (local->st_stateowner == &oo->oo_owner) |
| 2758 | *stpp = local; |
| 2759 | /* check for conflicting share reservations */ |
| 2760 | if (!test_share(local, open)) |
| 2761 | return nfserr_share_denied; |
| 2762 | } |
| 2763 | return nfs_ok; |
| 2764 | } |
| 2765 | |
| 2766 | static void nfs4_free_stateid(struct nfs4_ol_stateid *s) |
| 2767 | { |
| 2768 | kmem_cache_free(stateid_slab, s); |
| 2769 | } |
| 2770 | |
| 2771 | static inline int nfs4_access_to_access(u32 nfs4_access) |
| 2772 | { |
| 2773 | int flags = 0; |
| 2774 | |
| 2775 | if (nfs4_access & NFS4_SHARE_ACCESS_READ) |
| 2776 | flags |= NFSD_MAY_READ; |
| 2777 | if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) |
| 2778 | flags |= NFSD_MAY_WRITE; |
| 2779 | return flags; |
| 2780 | } |
| 2781 | |
| 2782 | static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp, |
| 2783 | struct svc_fh *cur_fh, struct nfsd4_open *open) |
| 2784 | { |
| 2785 | __be32 status; |
| 2786 | int oflag = nfs4_access_to_omode(open->op_share_access); |
| 2787 | int access = nfs4_access_to_access(open->op_share_access); |
| 2788 | |
| 2789 | if (!fp->fi_fds[oflag]) { |
| 2790 | status = nfsd_open(rqstp, cur_fh, S_IFREG, access, |
| 2791 | &fp->fi_fds[oflag]); |
| 2792 | if (status) |
| 2793 | return status; |
| 2794 | } |
| 2795 | nfs4_file_get_access(fp, oflag); |
| 2796 | |
| 2797 | return nfs_ok; |
| 2798 | } |
| 2799 | |
| 2800 | static inline __be32 |
| 2801 | nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, |
| 2802 | struct nfsd4_open *open) |
| 2803 | { |
| 2804 | struct iattr iattr = { |
| 2805 | .ia_valid = ATTR_SIZE, |
| 2806 | .ia_size = 0, |
| 2807 | }; |
| 2808 | if (!open->op_truncate) |
| 2809 | return 0; |
| 2810 | if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) |
| 2811 | return nfserr_inval; |
| 2812 | return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); |
| 2813 | } |
| 2814 | |
| 2815 | static __be32 |
| 2816 | nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open) |
| 2817 | { |
| 2818 | u32 op_share_access = open->op_share_access; |
| 2819 | bool new_access; |
| 2820 | __be32 status; |
| 2821 | |
| 2822 | new_access = !test_access(op_share_access, stp); |
| 2823 | if (new_access) { |
| 2824 | status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open); |
| 2825 | if (status) |
| 2826 | return status; |
| 2827 | } |
| 2828 | status = nfsd4_truncate(rqstp, cur_fh, open); |
| 2829 | if (status) { |
| 2830 | if (new_access) { |
| 2831 | int oflag = nfs4_access_to_omode(op_share_access); |
| 2832 | nfs4_file_put_access(fp, oflag); |
| 2833 | } |
| 2834 | return status; |
| 2835 | } |
| 2836 | /* remember the open */ |
| 2837 | set_access(op_share_access, stp); |
| 2838 | set_deny(open->op_share_deny, stp); |
| 2839 | |
| 2840 | return nfs_ok; |
| 2841 | } |
| 2842 | |
| 2843 | |
| 2844 | static void |
| 2845 | nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session) |
| 2846 | { |
| 2847 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; |
| 2848 | } |
| 2849 | |
| 2850 | /* Should we give out recallable state?: */ |
| 2851 | static bool nfsd4_cb_channel_good(struct nfs4_client *clp) |
| 2852 | { |
| 2853 | if (clp->cl_cb_state == NFSD4_CB_UP) |
| 2854 | return true; |
| 2855 | /* |
| 2856 | * In the sessions case, since we don't have to establish a |
| 2857 | * separate connection for callbacks, we assume it's OK |
| 2858 | * until we hear otherwise: |
| 2859 | */ |
| 2860 | return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN; |
| 2861 | } |
| 2862 | |
| 2863 | static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag) |
| 2864 | { |
| 2865 | struct file_lock *fl; |
| 2866 | |
| 2867 | fl = locks_alloc_lock(); |
| 2868 | if (!fl) |
| 2869 | return NULL; |
| 2870 | locks_init_lock(fl); |
| 2871 | fl->fl_lmops = &nfsd_lease_mng_ops; |
| 2872 | fl->fl_flags = FL_LEASE; |
| 2873 | fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; |
| 2874 | fl->fl_end = OFFSET_MAX; |
| 2875 | fl->fl_owner = (fl_owner_t)(dp->dl_file); |
| 2876 | fl->fl_pid = current->tgid; |
| 2877 | return fl; |
| 2878 | } |
| 2879 | |
| 2880 | static int nfs4_setlease(struct nfs4_delegation *dp, int flag) |
| 2881 | { |
| 2882 | struct nfs4_file *fp = dp->dl_file; |
| 2883 | struct file_lock *fl; |
| 2884 | int status; |
| 2885 | |
| 2886 | fl = nfs4_alloc_init_lease(dp, flag); |
| 2887 | if (!fl) |
| 2888 | return -ENOMEM; |
| 2889 | fl->fl_file = find_readable_file(fp); |
| 2890 | list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations); |
| 2891 | status = vfs_setlease(fl->fl_file, fl->fl_type, &fl); |
| 2892 | if (status) { |
| 2893 | list_del_init(&dp->dl_perclnt); |
| 2894 | locks_free_lock(fl); |
| 2895 | return -ENOMEM; |
| 2896 | } |
| 2897 | fp->fi_lease = fl; |
| 2898 | fp->fi_deleg_file = fl->fl_file; |
| 2899 | get_file(fp->fi_deleg_file); |
| 2900 | atomic_set(&fp->fi_delegees, 1); |
| 2901 | list_add(&dp->dl_perfile, &fp->fi_delegations); |
| 2902 | return 0; |
| 2903 | } |
| 2904 | |
| 2905 | static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag) |
| 2906 | { |
| 2907 | struct nfs4_file *fp = dp->dl_file; |
| 2908 | |
| 2909 | if (!fp->fi_lease) |
| 2910 | return nfs4_setlease(dp, flag); |
| 2911 | spin_lock(&recall_lock); |
| 2912 | if (fp->fi_had_conflict) { |
| 2913 | spin_unlock(&recall_lock); |
| 2914 | return -EAGAIN; |
| 2915 | } |
| 2916 | atomic_inc(&fp->fi_delegees); |
| 2917 | list_add(&dp->dl_perfile, &fp->fi_delegations); |
| 2918 | spin_unlock(&recall_lock); |
| 2919 | list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations); |
| 2920 | return 0; |
| 2921 | } |
| 2922 | |
| 2923 | static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status) |
| 2924 | { |
| 2925 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; |
| 2926 | if (status == -EAGAIN) |
| 2927 | open->op_why_no_deleg = WND4_CONTENTION; |
| 2928 | else { |
| 2929 | open->op_why_no_deleg = WND4_RESOURCE; |
| 2930 | switch (open->op_deleg_want) { |
| 2931 | case NFS4_SHARE_WANT_READ_DELEG: |
| 2932 | case NFS4_SHARE_WANT_WRITE_DELEG: |
| 2933 | case NFS4_SHARE_WANT_ANY_DELEG: |
| 2934 | break; |
| 2935 | case NFS4_SHARE_WANT_CANCEL: |
| 2936 | open->op_why_no_deleg = WND4_CANCELLED; |
| 2937 | break; |
| 2938 | case NFS4_SHARE_WANT_NO_DELEG: |
| 2939 | BUG(); /* not supposed to get here */ |
| 2940 | } |
| 2941 | } |
| 2942 | } |
| 2943 | |
| 2944 | /* |
| 2945 | * Attempt to hand out a delegation. |
| 2946 | */ |
| 2947 | static void |
| 2948 | nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp) |
| 2949 | { |
| 2950 | struct nfs4_delegation *dp; |
| 2951 | struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner); |
| 2952 | int cb_up; |
| 2953 | int status = 0, flag = 0; |
| 2954 | |
| 2955 | cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client); |
| 2956 | flag = NFS4_OPEN_DELEGATE_NONE; |
| 2957 | open->op_recall = 0; |
| 2958 | switch (open->op_claim_type) { |
| 2959 | case NFS4_OPEN_CLAIM_PREVIOUS: |
| 2960 | if (!cb_up) |
| 2961 | open->op_recall = 1; |
| 2962 | flag = open->op_delegate_type; |
| 2963 | if (flag == NFS4_OPEN_DELEGATE_NONE) |
| 2964 | goto out; |
| 2965 | break; |
| 2966 | case NFS4_OPEN_CLAIM_NULL: |
| 2967 | /* Let's not give out any delegations till everyone's |
| 2968 | * had the chance to reclaim theirs.... */ |
| 2969 | if (locks_in_grace()) |
| 2970 | goto out; |
| 2971 | if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED)) |
| 2972 | goto out; |
| 2973 | if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) |
| 2974 | flag = NFS4_OPEN_DELEGATE_WRITE; |
| 2975 | else |
| 2976 | flag = NFS4_OPEN_DELEGATE_READ; |
| 2977 | break; |
| 2978 | default: |
| 2979 | goto out; |
| 2980 | } |
| 2981 | |
| 2982 | dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh, flag); |
| 2983 | if (dp == NULL) |
| 2984 | goto out_no_deleg; |
| 2985 | status = nfs4_set_delegation(dp, flag); |
| 2986 | if (status) |
| 2987 | goto out_free; |
| 2988 | |
| 2989 | memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid)); |
| 2990 | |
| 2991 | dprintk("NFSD: delegation stateid=" STATEID_FMT "\n", |
| 2992 | STATEID_VAL(&dp->dl_stid.sc_stateid)); |
| 2993 | out: |
| 2994 | open->op_delegate_type = flag; |
| 2995 | if (flag == NFS4_OPEN_DELEGATE_NONE) { |
| 2996 | if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS && |
| 2997 | open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) |
| 2998 | dprintk("NFSD: WARNING: refusing delegation reclaim\n"); |
| 2999 | |
| 3000 | /* 4.1 client asking for a delegation? */ |
| 3001 | if (open->op_deleg_want) |
| 3002 | nfsd4_open_deleg_none_ext(open, status); |
| 3003 | } |
| 3004 | return; |
| 3005 | out_free: |
| 3006 | nfs4_put_delegation(dp); |
| 3007 | out_no_deleg: |
| 3008 | flag = NFS4_OPEN_DELEGATE_NONE; |
| 3009 | goto out; |
| 3010 | } |
| 3011 | |
| 3012 | static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open, |
| 3013 | struct nfs4_delegation *dp) |
| 3014 | { |
| 3015 | if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG && |
| 3016 | dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { |
| 3017 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; |
| 3018 | open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE; |
| 3019 | } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG && |
| 3020 | dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) { |
| 3021 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; |
| 3022 | open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE; |
| 3023 | } |
| 3024 | /* Otherwise the client must be confused wanting a delegation |
| 3025 | * it already has, therefore we don't return |
| 3026 | * NFS4_OPEN_DELEGATE_NONE_EXT and reason. |
| 3027 | */ |
| 3028 | } |
| 3029 | |
| 3030 | /* |
| 3031 | * called with nfs4_lock_state() held. |
| 3032 | */ |
| 3033 | __be32 |
| 3034 | nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) |
| 3035 | { |
| 3036 | struct nfsd4_compoundres *resp = rqstp->rq_resp; |
| 3037 | struct nfs4_client *cl = open->op_openowner->oo_owner.so_client; |
| 3038 | struct nfs4_file *fp = NULL; |
| 3039 | struct inode *ino = current_fh->fh_dentry->d_inode; |
| 3040 | struct nfs4_ol_stateid *stp = NULL; |
| 3041 | struct nfs4_delegation *dp = NULL; |
| 3042 | __be32 status; |
| 3043 | |
| 3044 | /* |
| 3045 | * Lookup file; if found, lookup stateid and check open request, |
| 3046 | * and check for delegations in the process of being recalled. |
| 3047 | * If not found, create the nfs4_file struct |
| 3048 | */ |
| 3049 | fp = find_file(ino); |
| 3050 | if (fp) { |
| 3051 | if ((status = nfs4_check_open(fp, open, &stp))) |
| 3052 | goto out; |
| 3053 | status = nfs4_check_deleg(cl, fp, open, &dp); |
| 3054 | if (status) |
| 3055 | goto out; |
| 3056 | } else { |
| 3057 | status = nfserr_bad_stateid; |
| 3058 | if (nfsd4_is_deleg_cur(open)) |
| 3059 | goto out; |
| 3060 | status = nfserr_jukebox; |
| 3061 | fp = open->op_file; |
| 3062 | open->op_file = NULL; |
| 3063 | nfsd4_init_file(fp, ino); |
| 3064 | } |
| 3065 | |
| 3066 | /* |
| 3067 | * OPEN the file, or upgrade an existing OPEN. |
| 3068 | * If truncate fails, the OPEN fails. |
| 3069 | */ |
| 3070 | if (stp) { |
| 3071 | /* Stateid was found, this is an OPEN upgrade */ |
| 3072 | status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); |
| 3073 | if (status) |
| 3074 | goto out; |
| 3075 | } else { |
| 3076 | status = nfs4_get_vfs_file(rqstp, fp, current_fh, open); |
| 3077 | if (status) |
| 3078 | goto out; |
| 3079 | stp = open->op_stp; |
| 3080 | open->op_stp = NULL; |
| 3081 | init_open_stateid(stp, fp, open); |
| 3082 | status = nfsd4_truncate(rqstp, current_fh, open); |
| 3083 | if (status) { |
| 3084 | release_open_stateid(stp); |
| 3085 | goto out; |
| 3086 | } |
| 3087 | } |
| 3088 | update_stateid(&stp->st_stid.sc_stateid); |
| 3089 | memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); |
| 3090 | |
| 3091 | if (nfsd4_has_session(&resp->cstate)) { |
| 3092 | open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED; |
| 3093 | |
| 3094 | if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) { |
| 3095 | open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT; |
| 3096 | open->op_why_no_deleg = WND4_NOT_WANTED; |
| 3097 | goto nodeleg; |
| 3098 | } |
| 3099 | } |
| 3100 | |
| 3101 | /* |
| 3102 | * Attempt to hand out a delegation. No error return, because the |
| 3103 | * OPEN succeeds even if we fail. |
| 3104 | */ |
| 3105 | nfs4_open_delegation(current_fh, open, stp); |
| 3106 | nodeleg: |
| 3107 | status = nfs_ok; |
| 3108 | |
| 3109 | dprintk("%s: stateid=" STATEID_FMT "\n", __func__, |
| 3110 | STATEID_VAL(&stp->st_stid.sc_stateid)); |
| 3111 | out: |
| 3112 | /* 4.1 client trying to upgrade/downgrade delegation? */ |
| 3113 | if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp && |
| 3114 | open->op_deleg_want) |
| 3115 | nfsd4_deleg_xgrade_none_ext(open, dp); |
| 3116 | |
| 3117 | if (fp) |
| 3118 | put_nfs4_file(fp); |
| 3119 | if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) |
| 3120 | nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate)); |
| 3121 | /* |
| 3122 | * To finish the open response, we just need to set the rflags. |
| 3123 | */ |
| 3124 | open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; |
| 3125 | if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) && |
| 3126 | !nfsd4_has_session(&resp->cstate)) |
| 3127 | open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; |
| 3128 | |
| 3129 | return status; |
| 3130 | } |
| 3131 | |
| 3132 | void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status) |
| 3133 | { |
| 3134 | if (open->op_openowner) { |
| 3135 | struct nfs4_openowner *oo = open->op_openowner; |
| 3136 | |
| 3137 | if (!list_empty(&oo->oo_owner.so_stateids)) |
| 3138 | list_del_init(&oo->oo_close_lru); |
| 3139 | if (oo->oo_flags & NFS4_OO_NEW) { |
| 3140 | if (status) { |
| 3141 | release_openowner(oo); |
| 3142 | open->op_openowner = NULL; |
| 3143 | } else |
| 3144 | oo->oo_flags &= ~NFS4_OO_NEW; |
| 3145 | } |
| 3146 | } |
| 3147 | if (open->op_file) |
| 3148 | nfsd4_free_file(open->op_file); |
| 3149 | if (open->op_stp) |
| 3150 | nfs4_free_stateid(open->op_stp); |
| 3151 | } |
| 3152 | |
| 3153 | __be32 |
| 3154 | nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 3155 | clientid_t *clid) |
| 3156 | { |
| 3157 | struct nfs4_client *clp; |
| 3158 | __be32 status; |
| 3159 | |
| 3160 | nfs4_lock_state(); |
| 3161 | dprintk("process_renew(%08x/%08x): starting\n", |
| 3162 | clid->cl_boot, clid->cl_id); |
| 3163 | status = nfserr_stale_clientid; |
| 3164 | if (STALE_CLIENTID(clid)) |
| 3165 | goto out; |
| 3166 | clp = find_confirmed_client(clid); |
| 3167 | status = nfserr_expired; |
| 3168 | if (clp == NULL) { |
| 3169 | /* We assume the client took too long to RENEW. */ |
| 3170 | dprintk("nfsd4_renew: clientid not found!\n"); |
| 3171 | goto out; |
| 3172 | } |
| 3173 | status = nfserr_cb_path_down; |
| 3174 | if (!list_empty(&clp->cl_delegations) |
| 3175 | && clp->cl_cb_state != NFSD4_CB_UP) |
| 3176 | goto out; |
| 3177 | status = nfs_ok; |
| 3178 | out: |
| 3179 | nfs4_unlock_state(); |
| 3180 | return status; |
| 3181 | } |
| 3182 | |
| 3183 | static struct lock_manager nfsd4_manager = { |
| 3184 | }; |
| 3185 | |
| 3186 | static bool grace_ended; |
| 3187 | |
| 3188 | static void |
| 3189 | nfsd4_end_grace(void) |
| 3190 | { |
| 3191 | /* do nothing if grace period already ended */ |
| 3192 | if (grace_ended) |
| 3193 | return; |
| 3194 | |
| 3195 | dprintk("NFSD: end of grace period\n"); |
| 3196 | grace_ended = true; |
| 3197 | nfsd4_record_grace_done(&init_net, boot_time); |
| 3198 | locks_end_grace(&nfsd4_manager); |
| 3199 | /* |
| 3200 | * Now that every NFSv4 client has had the chance to recover and |
| 3201 | * to see the (possibly new, possibly shorter) lease time, we |
| 3202 | * can safely set the next grace time to the current lease time: |
| 3203 | */ |
| 3204 | nfsd4_grace = nfsd4_lease; |
| 3205 | } |
| 3206 | |
| 3207 | static time_t |
| 3208 | nfs4_laundromat(void) |
| 3209 | { |
| 3210 | struct nfs4_client *clp; |
| 3211 | struct nfs4_openowner *oo; |
| 3212 | struct nfs4_delegation *dp; |
| 3213 | struct list_head *pos, *next, reaplist; |
| 3214 | time_t cutoff = get_seconds() - nfsd4_lease; |
| 3215 | time_t t, clientid_val = nfsd4_lease; |
| 3216 | time_t u, test_val = nfsd4_lease; |
| 3217 | |
| 3218 | nfs4_lock_state(); |
| 3219 | |
| 3220 | dprintk("NFSD: laundromat service - starting\n"); |
| 3221 | nfsd4_end_grace(); |
| 3222 | INIT_LIST_HEAD(&reaplist); |
| 3223 | spin_lock(&client_lock); |
| 3224 | list_for_each_safe(pos, next, &client_lru) { |
| 3225 | clp = list_entry(pos, struct nfs4_client, cl_lru); |
| 3226 | if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) { |
| 3227 | t = clp->cl_time - cutoff; |
| 3228 | if (clientid_val > t) |
| 3229 | clientid_val = t; |
| 3230 | break; |
| 3231 | } |
| 3232 | if (atomic_read(&clp->cl_refcount)) { |
| 3233 | dprintk("NFSD: client in use (clientid %08x)\n", |
| 3234 | clp->cl_clientid.cl_id); |
| 3235 | continue; |
| 3236 | } |
| 3237 | unhash_client_locked(clp); |
| 3238 | list_add(&clp->cl_lru, &reaplist); |
| 3239 | } |
| 3240 | spin_unlock(&client_lock); |
| 3241 | list_for_each_safe(pos, next, &reaplist) { |
| 3242 | clp = list_entry(pos, struct nfs4_client, cl_lru); |
| 3243 | dprintk("NFSD: purging unused client (clientid %08x)\n", |
| 3244 | clp->cl_clientid.cl_id); |
| 3245 | nfsd4_client_record_remove(clp); |
| 3246 | expire_client(clp); |
| 3247 | } |
| 3248 | spin_lock(&recall_lock); |
| 3249 | list_for_each_safe(pos, next, &del_recall_lru) { |
| 3250 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); |
| 3251 | if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) { |
| 3252 | u = dp->dl_time - cutoff; |
| 3253 | if (test_val > u) |
| 3254 | test_val = u; |
| 3255 | break; |
| 3256 | } |
| 3257 | list_move(&dp->dl_recall_lru, &reaplist); |
| 3258 | } |
| 3259 | spin_unlock(&recall_lock); |
| 3260 | list_for_each_safe(pos, next, &reaplist) { |
| 3261 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); |
| 3262 | unhash_delegation(dp); |
| 3263 | } |
| 3264 | test_val = nfsd4_lease; |
| 3265 | list_for_each_safe(pos, next, &close_lru) { |
| 3266 | oo = container_of(pos, struct nfs4_openowner, oo_close_lru); |
| 3267 | if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) { |
| 3268 | u = oo->oo_time - cutoff; |
| 3269 | if (test_val > u) |
| 3270 | test_val = u; |
| 3271 | break; |
| 3272 | } |
| 3273 | release_openowner(oo); |
| 3274 | } |
| 3275 | if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) |
| 3276 | clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; |
| 3277 | nfs4_unlock_state(); |
| 3278 | return clientid_val; |
| 3279 | } |
| 3280 | |
| 3281 | static struct workqueue_struct *laundry_wq; |
| 3282 | static void laundromat_main(struct work_struct *); |
| 3283 | static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); |
| 3284 | |
| 3285 | static void |
| 3286 | laundromat_main(struct work_struct *not_used) |
| 3287 | { |
| 3288 | time_t t; |
| 3289 | |
| 3290 | t = nfs4_laundromat(); |
| 3291 | dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); |
| 3292 | queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); |
| 3293 | } |
| 3294 | |
| 3295 | static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp) |
| 3296 | { |
| 3297 | if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode) |
| 3298 | return nfserr_bad_stateid; |
| 3299 | return nfs_ok; |
| 3300 | } |
| 3301 | |
| 3302 | static int |
| 3303 | STALE_STATEID(stateid_t *stateid) |
| 3304 | { |
| 3305 | if (stateid->si_opaque.so_clid.cl_boot == boot_time) |
| 3306 | return 0; |
| 3307 | dprintk("NFSD: stale stateid " STATEID_FMT "!\n", |
| 3308 | STATEID_VAL(stateid)); |
| 3309 | return 1; |
| 3310 | } |
| 3311 | |
| 3312 | static inline int |
| 3313 | access_permit_read(struct nfs4_ol_stateid *stp) |
| 3314 | { |
| 3315 | return test_access(NFS4_SHARE_ACCESS_READ, stp) || |
| 3316 | test_access(NFS4_SHARE_ACCESS_BOTH, stp) || |
| 3317 | test_access(NFS4_SHARE_ACCESS_WRITE, stp); |
| 3318 | } |
| 3319 | |
| 3320 | static inline int |
| 3321 | access_permit_write(struct nfs4_ol_stateid *stp) |
| 3322 | { |
| 3323 | return test_access(NFS4_SHARE_ACCESS_WRITE, stp) || |
| 3324 | test_access(NFS4_SHARE_ACCESS_BOTH, stp); |
| 3325 | } |
| 3326 | |
| 3327 | static |
| 3328 | __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags) |
| 3329 | { |
| 3330 | __be32 status = nfserr_openmode; |
| 3331 | |
| 3332 | /* For lock stateid's, we test the parent open, not the lock: */ |
| 3333 | if (stp->st_openstp) |
| 3334 | stp = stp->st_openstp; |
| 3335 | if ((flags & WR_STATE) && !access_permit_write(stp)) |
| 3336 | goto out; |
| 3337 | if ((flags & RD_STATE) && !access_permit_read(stp)) |
| 3338 | goto out; |
| 3339 | status = nfs_ok; |
| 3340 | out: |
| 3341 | return status; |
| 3342 | } |
| 3343 | |
| 3344 | static inline __be32 |
| 3345 | check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) |
| 3346 | { |
| 3347 | if (ONE_STATEID(stateid) && (flags & RD_STATE)) |
| 3348 | return nfs_ok; |
| 3349 | else if (locks_in_grace()) { |
| 3350 | /* Answer in remaining cases depends on existence of |
| 3351 | * conflicting state; so we must wait out the grace period. */ |
| 3352 | return nfserr_grace; |
| 3353 | } else if (flags & WR_STATE) |
| 3354 | return nfs4_share_conflict(current_fh, |
| 3355 | NFS4_SHARE_DENY_WRITE); |
| 3356 | else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ |
| 3357 | return nfs4_share_conflict(current_fh, |
| 3358 | NFS4_SHARE_DENY_READ); |
| 3359 | } |
| 3360 | |
| 3361 | /* |
| 3362 | * Allow READ/WRITE during grace period on recovered state only for files |
| 3363 | * that are not able to provide mandatory locking. |
| 3364 | */ |
| 3365 | static inline int |
| 3366 | grace_disallows_io(struct inode *inode) |
| 3367 | { |
| 3368 | return locks_in_grace() && mandatory_lock(inode); |
| 3369 | } |
| 3370 | |
| 3371 | /* Returns true iff a is later than b: */ |
| 3372 | static bool stateid_generation_after(stateid_t *a, stateid_t *b) |
| 3373 | { |
| 3374 | return (s32)a->si_generation - (s32)b->si_generation > 0; |
| 3375 | } |
| 3376 | |
| 3377 | static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session) |
| 3378 | { |
| 3379 | /* |
| 3380 | * When sessions are used the stateid generation number is ignored |
| 3381 | * when it is zero. |
| 3382 | */ |
| 3383 | if (has_session && in->si_generation == 0) |
| 3384 | return nfs_ok; |
| 3385 | |
| 3386 | if (in->si_generation == ref->si_generation) |
| 3387 | return nfs_ok; |
| 3388 | |
| 3389 | /* If the client sends us a stateid from the future, it's buggy: */ |
| 3390 | if (stateid_generation_after(in, ref)) |
| 3391 | return nfserr_bad_stateid; |
| 3392 | /* |
| 3393 | * However, we could see a stateid from the past, even from a |
| 3394 | * non-buggy client. For example, if the client sends a lock |
| 3395 | * while some IO is outstanding, the lock may bump si_generation |
| 3396 | * while the IO is still in flight. The client could avoid that |
| 3397 | * situation by waiting for responses on all the IO requests, |
| 3398 | * but better performance may result in retrying IO that |
| 3399 | * receives an old_stateid error if requests are rarely |
| 3400 | * reordered in flight: |
| 3401 | */ |
| 3402 | return nfserr_old_stateid; |
| 3403 | } |
| 3404 | |
| 3405 | __be32 nfs4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid) |
| 3406 | { |
| 3407 | struct nfs4_stid *s; |
| 3408 | struct nfs4_ol_stateid *ols; |
| 3409 | __be32 status; |
| 3410 | |
| 3411 | if (STALE_STATEID(stateid)) |
| 3412 | return nfserr_stale_stateid; |
| 3413 | |
| 3414 | s = find_stateid(cl, stateid); |
| 3415 | if (!s) |
| 3416 | return nfserr_stale_stateid; |
| 3417 | status = check_stateid_generation(stateid, &s->sc_stateid, 1); |
| 3418 | if (status) |
| 3419 | return status; |
| 3420 | if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID))) |
| 3421 | return nfs_ok; |
| 3422 | ols = openlockstateid(s); |
| 3423 | if (ols->st_stateowner->so_is_open_owner |
| 3424 | && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED)) |
| 3425 | return nfserr_bad_stateid; |
| 3426 | return nfs_ok; |
| 3427 | } |
| 3428 | |
| 3429 | static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s) |
| 3430 | { |
| 3431 | struct nfs4_client *cl; |
| 3432 | |
| 3433 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) |
| 3434 | return nfserr_bad_stateid; |
| 3435 | if (STALE_STATEID(stateid)) |
| 3436 | return nfserr_stale_stateid; |
| 3437 | cl = find_confirmed_client(&stateid->si_opaque.so_clid); |
| 3438 | if (!cl) |
| 3439 | return nfserr_expired; |
| 3440 | *s = find_stateid_by_type(cl, stateid, typemask); |
| 3441 | if (!*s) |
| 3442 | return nfserr_bad_stateid; |
| 3443 | return nfs_ok; |
| 3444 | |
| 3445 | } |
| 3446 | |
| 3447 | /* |
| 3448 | * Checks for stateid operations |
| 3449 | */ |
| 3450 | __be32 |
| 3451 | nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate, |
| 3452 | stateid_t *stateid, int flags, struct file **filpp) |
| 3453 | { |
| 3454 | struct nfs4_stid *s; |
| 3455 | struct nfs4_ol_stateid *stp = NULL; |
| 3456 | struct nfs4_delegation *dp = NULL; |
| 3457 | struct svc_fh *current_fh = &cstate->current_fh; |
| 3458 | struct inode *ino = current_fh->fh_dentry->d_inode; |
| 3459 | __be32 status; |
| 3460 | |
| 3461 | if (filpp) |
| 3462 | *filpp = NULL; |
| 3463 | |
| 3464 | if (grace_disallows_io(ino)) |
| 3465 | return nfserr_grace; |
| 3466 | |
| 3467 | if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) |
| 3468 | return check_special_stateids(current_fh, stateid, flags); |
| 3469 | |
| 3470 | status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s); |
| 3471 | if (status) |
| 3472 | return status; |
| 3473 | status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate)); |
| 3474 | if (status) |
| 3475 | goto out; |
| 3476 | switch (s->sc_type) { |
| 3477 | case NFS4_DELEG_STID: |
| 3478 | dp = delegstateid(s); |
| 3479 | status = nfs4_check_delegmode(dp, flags); |
| 3480 | if (status) |
| 3481 | goto out; |
| 3482 | if (filpp) { |
| 3483 | *filpp = dp->dl_file->fi_deleg_file; |
| 3484 | BUG_ON(!*filpp); |
| 3485 | } |
| 3486 | break; |
| 3487 | case NFS4_OPEN_STID: |
| 3488 | case NFS4_LOCK_STID: |
| 3489 | stp = openlockstateid(s); |
| 3490 | status = nfs4_check_fh(current_fh, stp); |
| 3491 | if (status) |
| 3492 | goto out; |
| 3493 | if (stp->st_stateowner->so_is_open_owner |
| 3494 | && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED)) |
| 3495 | goto out; |
| 3496 | status = nfs4_check_openmode(stp, flags); |
| 3497 | if (status) |
| 3498 | goto out; |
| 3499 | if (filpp) { |
| 3500 | if (flags & RD_STATE) |
| 3501 | *filpp = find_readable_file(stp->st_file); |
| 3502 | else |
| 3503 | *filpp = find_writeable_file(stp->st_file); |
| 3504 | } |
| 3505 | break; |
| 3506 | default: |
| 3507 | return nfserr_bad_stateid; |
| 3508 | } |
| 3509 | status = nfs_ok; |
| 3510 | out: |
| 3511 | return status; |
| 3512 | } |
| 3513 | |
| 3514 | static __be32 |
| 3515 | nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp) |
| 3516 | { |
| 3517 | if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner))) |
| 3518 | return nfserr_locks_held; |
| 3519 | release_lock_stateid(stp); |
| 3520 | return nfs_ok; |
| 3521 | } |
| 3522 | |
| 3523 | /* |
| 3524 | * Test if the stateid is valid |
| 3525 | */ |
| 3526 | __be32 |
| 3527 | nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 3528 | struct nfsd4_test_stateid *test_stateid) |
| 3529 | { |
| 3530 | struct nfsd4_test_stateid_id *stateid; |
| 3531 | struct nfs4_client *cl = cstate->session->se_client; |
| 3532 | |
| 3533 | nfs4_lock_state(); |
| 3534 | list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list) |
| 3535 | stateid->ts_id_status = nfs4_validate_stateid(cl, &stateid->ts_id_stateid); |
| 3536 | nfs4_unlock_state(); |
| 3537 | |
| 3538 | return nfs_ok; |
| 3539 | } |
| 3540 | |
| 3541 | __be32 |
| 3542 | nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 3543 | struct nfsd4_free_stateid *free_stateid) |
| 3544 | { |
| 3545 | stateid_t *stateid = &free_stateid->fr_stateid; |
| 3546 | struct nfs4_stid *s; |
| 3547 | struct nfs4_client *cl = cstate->session->se_client; |
| 3548 | __be32 ret = nfserr_bad_stateid; |
| 3549 | |
| 3550 | nfs4_lock_state(); |
| 3551 | s = find_stateid(cl, stateid); |
| 3552 | if (!s) |
| 3553 | goto out; |
| 3554 | switch (s->sc_type) { |
| 3555 | case NFS4_DELEG_STID: |
| 3556 | ret = nfserr_locks_held; |
| 3557 | goto out; |
| 3558 | case NFS4_OPEN_STID: |
| 3559 | case NFS4_LOCK_STID: |
| 3560 | ret = check_stateid_generation(stateid, &s->sc_stateid, 1); |
| 3561 | if (ret) |
| 3562 | goto out; |
| 3563 | if (s->sc_type == NFS4_LOCK_STID) |
| 3564 | ret = nfsd4_free_lock_stateid(openlockstateid(s)); |
| 3565 | else |
| 3566 | ret = nfserr_locks_held; |
| 3567 | break; |
| 3568 | default: |
| 3569 | ret = nfserr_bad_stateid; |
| 3570 | } |
| 3571 | out: |
| 3572 | nfs4_unlock_state(); |
| 3573 | return ret; |
| 3574 | } |
| 3575 | |
| 3576 | static inline int |
| 3577 | setlkflg (int type) |
| 3578 | { |
| 3579 | return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? |
| 3580 | RD_STATE : WR_STATE; |
| 3581 | } |
| 3582 | |
| 3583 | static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp) |
| 3584 | { |
| 3585 | struct svc_fh *current_fh = &cstate->current_fh; |
| 3586 | struct nfs4_stateowner *sop = stp->st_stateowner; |
| 3587 | __be32 status; |
| 3588 | |
| 3589 | status = nfsd4_check_seqid(cstate, sop, seqid); |
| 3590 | if (status) |
| 3591 | return status; |
| 3592 | if (stp->st_stid.sc_type == NFS4_CLOSED_STID) |
| 3593 | /* |
| 3594 | * "Closed" stateid's exist *only* to return |
| 3595 | * nfserr_replay_me from the previous step. |
| 3596 | */ |
| 3597 | return nfserr_bad_stateid; |
| 3598 | status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate)); |
| 3599 | if (status) |
| 3600 | return status; |
| 3601 | return nfs4_check_fh(current_fh, stp); |
| 3602 | } |
| 3603 | |
| 3604 | /* |
| 3605 | * Checks for sequence id mutating operations. |
| 3606 | */ |
| 3607 | static __be32 |
| 3608 | nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, |
| 3609 | stateid_t *stateid, char typemask, |
| 3610 | struct nfs4_ol_stateid **stpp) |
| 3611 | { |
| 3612 | __be32 status; |
| 3613 | struct nfs4_stid *s; |
| 3614 | |
| 3615 | dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, |
| 3616 | seqid, STATEID_VAL(stateid)); |
| 3617 | |
| 3618 | *stpp = NULL; |
| 3619 | status = nfsd4_lookup_stateid(stateid, typemask, &s); |
| 3620 | if (status) |
| 3621 | return status; |
| 3622 | *stpp = openlockstateid(s); |
| 3623 | cstate->replay_owner = (*stpp)->st_stateowner; |
| 3624 | |
| 3625 | return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp); |
| 3626 | } |
| 3627 | |
| 3628 | static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp) |
| 3629 | { |
| 3630 | __be32 status; |
| 3631 | struct nfs4_openowner *oo; |
| 3632 | |
| 3633 | status = nfs4_preprocess_seqid_op(cstate, seqid, stateid, |
| 3634 | NFS4_OPEN_STID, stpp); |
| 3635 | if (status) |
| 3636 | return status; |
| 3637 | oo = openowner((*stpp)->st_stateowner); |
| 3638 | if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) |
| 3639 | return nfserr_bad_stateid; |
| 3640 | return nfs_ok; |
| 3641 | } |
| 3642 | |
| 3643 | __be32 |
| 3644 | nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 3645 | struct nfsd4_open_confirm *oc) |
| 3646 | { |
| 3647 | __be32 status; |
| 3648 | struct nfs4_openowner *oo; |
| 3649 | struct nfs4_ol_stateid *stp; |
| 3650 | |
| 3651 | dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", |
| 3652 | (int)cstate->current_fh.fh_dentry->d_name.len, |
| 3653 | cstate->current_fh.fh_dentry->d_name.name); |
| 3654 | |
| 3655 | status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); |
| 3656 | if (status) |
| 3657 | return status; |
| 3658 | |
| 3659 | nfs4_lock_state(); |
| 3660 | |
| 3661 | status = nfs4_preprocess_seqid_op(cstate, |
| 3662 | oc->oc_seqid, &oc->oc_req_stateid, |
| 3663 | NFS4_OPEN_STID, &stp); |
| 3664 | if (status) |
| 3665 | goto out; |
| 3666 | oo = openowner(stp->st_stateowner); |
| 3667 | status = nfserr_bad_stateid; |
| 3668 | if (oo->oo_flags & NFS4_OO_CONFIRMED) |
| 3669 | goto out; |
| 3670 | oo->oo_flags |= NFS4_OO_CONFIRMED; |
| 3671 | update_stateid(&stp->st_stid.sc_stateid); |
| 3672 | memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); |
| 3673 | dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", |
| 3674 | __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid)); |
| 3675 | |
| 3676 | nfsd4_client_record_create(oo->oo_owner.so_client); |
| 3677 | status = nfs_ok; |
| 3678 | out: |
| 3679 | if (!cstate->replay_owner) |
| 3680 | nfs4_unlock_state(); |
| 3681 | return status; |
| 3682 | } |
| 3683 | |
| 3684 | static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access) |
| 3685 | { |
| 3686 | if (!test_access(access, stp)) |
| 3687 | return; |
| 3688 | nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access)); |
| 3689 | clear_access(access, stp); |
| 3690 | } |
| 3691 | |
| 3692 | static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access) |
| 3693 | { |
| 3694 | switch (to_access) { |
| 3695 | case NFS4_SHARE_ACCESS_READ: |
| 3696 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE); |
| 3697 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); |
| 3698 | break; |
| 3699 | case NFS4_SHARE_ACCESS_WRITE: |
| 3700 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ); |
| 3701 | nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH); |
| 3702 | break; |
| 3703 | case NFS4_SHARE_ACCESS_BOTH: |
| 3704 | break; |
| 3705 | default: |
| 3706 | BUG(); |
| 3707 | } |
| 3708 | } |
| 3709 | |
| 3710 | static void |
| 3711 | reset_union_bmap_deny(unsigned long deny, struct nfs4_ol_stateid *stp) |
| 3712 | { |
| 3713 | int i; |
| 3714 | for (i = 0; i < 4; i++) { |
| 3715 | if ((i & deny) != i) |
| 3716 | clear_deny(i, stp); |
| 3717 | } |
| 3718 | } |
| 3719 | |
| 3720 | __be32 |
| 3721 | nfsd4_open_downgrade(struct svc_rqst *rqstp, |
| 3722 | struct nfsd4_compound_state *cstate, |
| 3723 | struct nfsd4_open_downgrade *od) |
| 3724 | { |
| 3725 | __be32 status; |
| 3726 | struct nfs4_ol_stateid *stp; |
| 3727 | |
| 3728 | dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", |
| 3729 | (int)cstate->current_fh.fh_dentry->d_name.len, |
| 3730 | cstate->current_fh.fh_dentry->d_name.name); |
| 3731 | |
| 3732 | /* We don't yet support WANT bits: */ |
| 3733 | if (od->od_deleg_want) |
| 3734 | dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__, |
| 3735 | od->od_deleg_want); |
| 3736 | |
| 3737 | nfs4_lock_state(); |
| 3738 | status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid, |
| 3739 | &od->od_stateid, &stp); |
| 3740 | if (status) |
| 3741 | goto out; |
| 3742 | status = nfserr_inval; |
| 3743 | if (!test_access(od->od_share_access, stp)) { |
| 3744 | dprintk("NFSD: access not a subset current bitmap: 0x%lx, input access=%08x\n", |
| 3745 | stp->st_access_bmap, od->od_share_access); |
| 3746 | goto out; |
| 3747 | } |
| 3748 | if (!test_deny(od->od_share_deny, stp)) { |
| 3749 | dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", |
| 3750 | stp->st_deny_bmap, od->od_share_deny); |
| 3751 | goto out; |
| 3752 | } |
| 3753 | nfs4_stateid_downgrade(stp, od->od_share_access); |
| 3754 | |
| 3755 | reset_union_bmap_deny(od->od_share_deny, stp); |
| 3756 | |
| 3757 | update_stateid(&stp->st_stid.sc_stateid); |
| 3758 | memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); |
| 3759 | status = nfs_ok; |
| 3760 | out: |
| 3761 | if (!cstate->replay_owner) |
| 3762 | nfs4_unlock_state(); |
| 3763 | return status; |
| 3764 | } |
| 3765 | |
| 3766 | void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so) |
| 3767 | { |
| 3768 | struct nfs4_openowner *oo; |
| 3769 | struct nfs4_ol_stateid *s; |
| 3770 | |
| 3771 | if (!so->so_is_open_owner) |
| 3772 | return; |
| 3773 | oo = openowner(so); |
| 3774 | s = oo->oo_last_closed_stid; |
| 3775 | if (!s) |
| 3776 | return; |
| 3777 | if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) { |
| 3778 | /* Release the last_closed_stid on the next seqid bump: */ |
| 3779 | oo->oo_flags |= NFS4_OO_PURGE_CLOSE; |
| 3780 | return; |
| 3781 | } |
| 3782 | oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE; |
| 3783 | release_last_closed_stateid(oo); |
| 3784 | } |
| 3785 | |
| 3786 | static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s) |
| 3787 | { |
| 3788 | unhash_open_stateid(s); |
| 3789 | s->st_stid.sc_type = NFS4_CLOSED_STID; |
| 3790 | } |
| 3791 | |
| 3792 | /* |
| 3793 | * nfs4_unlock_state() called after encode |
| 3794 | */ |
| 3795 | __be32 |
| 3796 | nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 3797 | struct nfsd4_close *close) |
| 3798 | { |
| 3799 | __be32 status; |
| 3800 | struct nfs4_openowner *oo; |
| 3801 | struct nfs4_ol_stateid *stp; |
| 3802 | |
| 3803 | dprintk("NFSD: nfsd4_close on file %.*s\n", |
| 3804 | (int)cstate->current_fh.fh_dentry->d_name.len, |
| 3805 | cstate->current_fh.fh_dentry->d_name.name); |
| 3806 | |
| 3807 | nfs4_lock_state(); |
| 3808 | status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid, |
| 3809 | &close->cl_stateid, |
| 3810 | NFS4_OPEN_STID|NFS4_CLOSED_STID, |
| 3811 | &stp); |
| 3812 | if (status) |
| 3813 | goto out; |
| 3814 | oo = openowner(stp->st_stateowner); |
| 3815 | status = nfs_ok; |
| 3816 | update_stateid(&stp->st_stid.sc_stateid); |
| 3817 | memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); |
| 3818 | |
| 3819 | nfsd4_close_open_stateid(stp); |
| 3820 | oo->oo_last_closed_stid = stp; |
| 3821 | |
| 3822 | /* place unused nfs4_stateowners on so_close_lru list to be |
| 3823 | * released by the laundromat service after the lease period |
| 3824 | * to enable us to handle CLOSE replay |
| 3825 | */ |
| 3826 | if (list_empty(&oo->oo_owner.so_stateids)) |
| 3827 | move_to_close_lru(oo); |
| 3828 | out: |
| 3829 | if (!cstate->replay_owner) |
| 3830 | nfs4_unlock_state(); |
| 3831 | return status; |
| 3832 | } |
| 3833 | |
| 3834 | __be32 |
| 3835 | nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 3836 | struct nfsd4_delegreturn *dr) |
| 3837 | { |
| 3838 | struct nfs4_delegation *dp; |
| 3839 | stateid_t *stateid = &dr->dr_stateid; |
| 3840 | struct nfs4_stid *s; |
| 3841 | struct inode *inode; |
| 3842 | __be32 status; |
| 3843 | |
| 3844 | if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) |
| 3845 | return status; |
| 3846 | inode = cstate->current_fh.fh_dentry->d_inode; |
| 3847 | |
| 3848 | nfs4_lock_state(); |
| 3849 | status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s); |
| 3850 | if (status) |
| 3851 | goto out; |
| 3852 | dp = delegstateid(s); |
| 3853 | status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate)); |
| 3854 | if (status) |
| 3855 | goto out; |
| 3856 | |
| 3857 | unhash_delegation(dp); |
| 3858 | out: |
| 3859 | nfs4_unlock_state(); |
| 3860 | |
| 3861 | return status; |
| 3862 | } |
| 3863 | |
| 3864 | |
| 3865 | #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) |
| 3866 | |
| 3867 | #define LOCKOWNER_INO_HASH_BITS 8 |
| 3868 | #define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS) |
| 3869 | #define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1) |
| 3870 | |
| 3871 | static inline u64 |
| 3872 | end_offset(u64 start, u64 len) |
| 3873 | { |
| 3874 | u64 end; |
| 3875 | |
| 3876 | end = start + len; |
| 3877 | return end >= start ? end: NFS4_MAX_UINT64; |
| 3878 | } |
| 3879 | |
| 3880 | /* last octet in a range */ |
| 3881 | static inline u64 |
| 3882 | last_byte_offset(u64 start, u64 len) |
| 3883 | { |
| 3884 | u64 end; |
| 3885 | |
| 3886 | BUG_ON(!len); |
| 3887 | end = start + len; |
| 3888 | return end > start ? end - 1: NFS4_MAX_UINT64; |
| 3889 | } |
| 3890 | |
| 3891 | static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername) |
| 3892 | { |
| 3893 | return (file_hashval(inode) + cl_id |
| 3894 | + opaque_hashval(ownername->data, ownername->len)) |
| 3895 | & LOCKOWNER_INO_HASH_MASK; |
| 3896 | } |
| 3897 | |
| 3898 | static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE]; |
| 3899 | |
| 3900 | /* |
| 3901 | * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that |
| 3902 | * we can't properly handle lock requests that go beyond the (2^63 - 1)-th |
| 3903 | * byte, because of sign extension problems. Since NFSv4 calls for 64-bit |
| 3904 | * locking, this prevents us from being completely protocol-compliant. The |
| 3905 | * real solution to this problem is to start using unsigned file offsets in |
| 3906 | * the VFS, but this is a very deep change! |
| 3907 | */ |
| 3908 | static inline void |
| 3909 | nfs4_transform_lock_offset(struct file_lock *lock) |
| 3910 | { |
| 3911 | if (lock->fl_start < 0) |
| 3912 | lock->fl_start = OFFSET_MAX; |
| 3913 | if (lock->fl_end < 0) |
| 3914 | lock->fl_end = OFFSET_MAX; |
| 3915 | } |
| 3916 | |
| 3917 | /* Hack!: For now, we're defining this just so we can use a pointer to it |
| 3918 | * as a unique cookie to identify our (NFSv4's) posix locks. */ |
| 3919 | static const struct lock_manager_operations nfsd_posix_mng_ops = { |
| 3920 | }; |
| 3921 | |
| 3922 | static inline void |
| 3923 | nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) |
| 3924 | { |
| 3925 | struct nfs4_lockowner *lo; |
| 3926 | |
| 3927 | if (fl->fl_lmops == &nfsd_posix_mng_ops) { |
| 3928 | lo = (struct nfs4_lockowner *) fl->fl_owner; |
| 3929 | deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data, |
| 3930 | lo->lo_owner.so_owner.len, GFP_KERNEL); |
| 3931 | if (!deny->ld_owner.data) |
| 3932 | /* We just don't care that much */ |
| 3933 | goto nevermind; |
| 3934 | deny->ld_owner.len = lo->lo_owner.so_owner.len; |
| 3935 | deny->ld_clientid = lo->lo_owner.so_client->cl_clientid; |
| 3936 | } else { |
| 3937 | nevermind: |
| 3938 | deny->ld_owner.len = 0; |
| 3939 | deny->ld_owner.data = NULL; |
| 3940 | deny->ld_clientid.cl_boot = 0; |
| 3941 | deny->ld_clientid.cl_id = 0; |
| 3942 | } |
| 3943 | deny->ld_start = fl->fl_start; |
| 3944 | deny->ld_length = NFS4_MAX_UINT64; |
| 3945 | if (fl->fl_end != NFS4_MAX_UINT64) |
| 3946 | deny->ld_length = fl->fl_end - fl->fl_start + 1; |
| 3947 | deny->ld_type = NFS4_READ_LT; |
| 3948 | if (fl->fl_type != F_RDLCK) |
| 3949 | deny->ld_type = NFS4_WRITE_LT; |
| 3950 | } |
| 3951 | |
| 3952 | static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner) |
| 3953 | { |
| 3954 | struct nfs4_ol_stateid *lst; |
| 3955 | |
| 3956 | if (!same_owner_str(&lo->lo_owner, owner, clid)) |
| 3957 | return false; |
| 3958 | lst = list_first_entry(&lo->lo_owner.so_stateids, |
| 3959 | struct nfs4_ol_stateid, st_perstateowner); |
| 3960 | return lst->st_file->fi_inode == inode; |
| 3961 | } |
| 3962 | |
| 3963 | static struct nfs4_lockowner * |
| 3964 | find_lockowner_str(struct inode *inode, clientid_t *clid, |
| 3965 | struct xdr_netobj *owner) |
| 3966 | { |
| 3967 | unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner); |
| 3968 | struct nfs4_lockowner *lo; |
| 3969 | |
| 3970 | list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) { |
| 3971 | if (same_lockowner_ino(lo, inode, clid, owner)) |
| 3972 | return lo; |
| 3973 | } |
| 3974 | return NULL; |
| 3975 | } |
| 3976 | |
| 3977 | static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp) |
| 3978 | { |
| 3979 | struct inode *inode = open_stp->st_file->fi_inode; |
| 3980 | unsigned int inohash = lockowner_ino_hashval(inode, |
| 3981 | clp->cl_clientid.cl_id, &lo->lo_owner.so_owner); |
| 3982 | |
| 3983 | list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]); |
| 3984 | list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]); |
| 3985 | list_add(&lo->lo_perstateid, &open_stp->st_lockowners); |
| 3986 | } |
| 3987 | |
| 3988 | /* |
| 3989 | * Alloc a lock owner structure. |
| 3990 | * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has |
| 3991 | * occurred. |
| 3992 | * |
| 3993 | * strhashval = ownerstr_hashval |
| 3994 | */ |
| 3995 | |
| 3996 | static struct nfs4_lockowner * |
| 3997 | alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) { |
| 3998 | struct nfs4_lockowner *lo; |
| 3999 | |
| 4000 | lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp); |
| 4001 | if (!lo) |
| 4002 | return NULL; |
| 4003 | INIT_LIST_HEAD(&lo->lo_owner.so_stateids); |
| 4004 | lo->lo_owner.so_is_open_owner = 0; |
| 4005 | /* It is the openowner seqid that will be incremented in encode in the |
| 4006 | * case of new lockowners; so increment the lock seqid manually: */ |
| 4007 | lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1; |
| 4008 | hash_lockowner(lo, strhashval, clp, open_stp); |
| 4009 | return lo; |
| 4010 | } |
| 4011 | |
| 4012 | static struct nfs4_ol_stateid * |
| 4013 | alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp) |
| 4014 | { |
| 4015 | struct nfs4_ol_stateid *stp; |
| 4016 | struct nfs4_client *clp = lo->lo_owner.so_client; |
| 4017 | |
| 4018 | stp = nfs4_alloc_stateid(clp); |
| 4019 | if (stp == NULL) |
| 4020 | return NULL; |
| 4021 | init_stid(&stp->st_stid, clp, NFS4_LOCK_STID); |
| 4022 | list_add(&stp->st_perfile, &fp->fi_stateids); |
| 4023 | list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids); |
| 4024 | stp->st_stateowner = &lo->lo_owner; |
| 4025 | get_nfs4_file(fp); |
| 4026 | stp->st_file = fp; |
| 4027 | stp->st_access_bmap = 0; |
| 4028 | stp->st_deny_bmap = open_stp->st_deny_bmap; |
| 4029 | stp->st_openstp = open_stp; |
| 4030 | return stp; |
| 4031 | } |
| 4032 | |
| 4033 | static int |
| 4034 | check_lock_length(u64 offset, u64 length) |
| 4035 | { |
| 4036 | return ((length == 0) || ((length != NFS4_MAX_UINT64) && |
| 4037 | LOFF_OVERFLOW(offset, length))); |
| 4038 | } |
| 4039 | |
| 4040 | static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access) |
| 4041 | { |
| 4042 | struct nfs4_file *fp = lock_stp->st_file; |
| 4043 | int oflag = nfs4_access_to_omode(access); |
| 4044 | |
| 4045 | if (test_access(access, lock_stp)) |
| 4046 | return; |
| 4047 | nfs4_file_get_access(fp, oflag); |
| 4048 | set_access(access, lock_stp); |
| 4049 | } |
| 4050 | |
| 4051 | static __be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new) |
| 4052 | { |
| 4053 | struct nfs4_file *fi = ost->st_file; |
| 4054 | struct nfs4_openowner *oo = openowner(ost->st_stateowner); |
| 4055 | struct nfs4_client *cl = oo->oo_owner.so_client; |
| 4056 | struct nfs4_lockowner *lo; |
| 4057 | unsigned int strhashval; |
| 4058 | |
| 4059 | lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner); |
| 4060 | if (lo) { |
| 4061 | if (!cstate->minorversion) |
| 4062 | return nfserr_bad_seqid; |
| 4063 | /* XXX: a lockowner always has exactly one stateid: */ |
| 4064 | *lst = list_first_entry(&lo->lo_owner.so_stateids, |
| 4065 | struct nfs4_ol_stateid, st_perstateowner); |
| 4066 | return nfs_ok; |
| 4067 | } |
| 4068 | strhashval = ownerstr_hashval(cl->cl_clientid.cl_id, |
| 4069 | &lock->v.new.owner); |
| 4070 | lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock); |
| 4071 | if (lo == NULL) |
| 4072 | return nfserr_jukebox; |
| 4073 | *lst = alloc_init_lock_stateid(lo, fi, ost); |
| 4074 | if (*lst == NULL) { |
| 4075 | release_lockowner(lo); |
| 4076 | return nfserr_jukebox; |
| 4077 | } |
| 4078 | *new = true; |
| 4079 | return nfs_ok; |
| 4080 | } |
| 4081 | |
| 4082 | /* |
| 4083 | * LOCK operation |
| 4084 | */ |
| 4085 | __be32 |
| 4086 | nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 4087 | struct nfsd4_lock *lock) |
| 4088 | { |
| 4089 | struct nfs4_openowner *open_sop = NULL; |
| 4090 | struct nfs4_lockowner *lock_sop = NULL; |
| 4091 | struct nfs4_ol_stateid *lock_stp; |
| 4092 | struct file *filp = NULL; |
| 4093 | struct file_lock file_lock; |
| 4094 | struct file_lock conflock; |
| 4095 | __be32 status = 0; |
| 4096 | bool new_state = false; |
| 4097 | int lkflg; |
| 4098 | int err; |
| 4099 | |
| 4100 | dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", |
| 4101 | (long long) lock->lk_offset, |
| 4102 | (long long) lock->lk_length); |
| 4103 | |
| 4104 | if (check_lock_length(lock->lk_offset, lock->lk_length)) |
| 4105 | return nfserr_inval; |
| 4106 | |
| 4107 | if ((status = fh_verify(rqstp, &cstate->current_fh, |
| 4108 | S_IFREG, NFSD_MAY_LOCK))) { |
| 4109 | dprintk("NFSD: nfsd4_lock: permission denied!\n"); |
| 4110 | return status; |
| 4111 | } |
| 4112 | |
| 4113 | nfs4_lock_state(); |
| 4114 | |
| 4115 | if (lock->lk_is_new) { |
| 4116 | /* |
| 4117 | * Client indicates that this is a new lockowner. |
| 4118 | * Use open owner and open stateid to create lock owner and |
| 4119 | * lock stateid. |
| 4120 | */ |
| 4121 | struct nfs4_ol_stateid *open_stp = NULL; |
| 4122 | |
| 4123 | if (nfsd4_has_session(cstate)) |
| 4124 | /* See rfc 5661 18.10.3: given clientid is ignored: */ |
| 4125 | memcpy(&lock->v.new.clientid, |
| 4126 | &cstate->session->se_client->cl_clientid, |
| 4127 | sizeof(clientid_t)); |
| 4128 | |
| 4129 | status = nfserr_stale_clientid; |
| 4130 | if (STALE_CLIENTID(&lock->lk_new_clientid)) |
| 4131 | goto out; |
| 4132 | |
| 4133 | /* validate and update open stateid and open seqid */ |
| 4134 | status = nfs4_preprocess_confirmed_seqid_op(cstate, |
| 4135 | lock->lk_new_open_seqid, |
| 4136 | &lock->lk_new_open_stateid, |
| 4137 | &open_stp); |
| 4138 | if (status) |
| 4139 | goto out; |
| 4140 | open_sop = openowner(open_stp->st_stateowner); |
| 4141 | status = nfserr_bad_stateid; |
| 4142 | if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid, |
| 4143 | &lock->v.new.clientid)) |
| 4144 | goto out; |
| 4145 | status = lookup_or_create_lock_state(cstate, open_stp, lock, |
| 4146 | &lock_stp, &new_state); |
| 4147 | if (status) |
| 4148 | goto out; |
| 4149 | } else { |
| 4150 | /* lock (lock owner + lock stateid) already exists */ |
| 4151 | status = nfs4_preprocess_seqid_op(cstate, |
| 4152 | lock->lk_old_lock_seqid, |
| 4153 | &lock->lk_old_lock_stateid, |
| 4154 | NFS4_LOCK_STID, &lock_stp); |
| 4155 | if (status) |
| 4156 | goto out; |
| 4157 | } |
| 4158 | lock_sop = lockowner(lock_stp->st_stateowner); |
| 4159 | |
| 4160 | lkflg = setlkflg(lock->lk_type); |
| 4161 | status = nfs4_check_openmode(lock_stp, lkflg); |
| 4162 | if (status) |
| 4163 | goto out; |
| 4164 | |
| 4165 | status = nfserr_grace; |
| 4166 | if (locks_in_grace() && !lock->lk_reclaim) |
| 4167 | goto out; |
| 4168 | status = nfserr_no_grace; |
| 4169 | if (!locks_in_grace() && lock->lk_reclaim) |
| 4170 | goto out; |
| 4171 | |
| 4172 | locks_init_lock(&file_lock); |
| 4173 | switch (lock->lk_type) { |
| 4174 | case NFS4_READ_LT: |
| 4175 | case NFS4_READW_LT: |
| 4176 | filp = find_readable_file(lock_stp->st_file); |
| 4177 | if (filp) |
| 4178 | get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ); |
| 4179 | file_lock.fl_type = F_RDLCK; |
| 4180 | break; |
| 4181 | case NFS4_WRITE_LT: |
| 4182 | case NFS4_WRITEW_LT: |
| 4183 | filp = find_writeable_file(lock_stp->st_file); |
| 4184 | if (filp) |
| 4185 | get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE); |
| 4186 | file_lock.fl_type = F_WRLCK; |
| 4187 | break; |
| 4188 | default: |
| 4189 | status = nfserr_inval; |
| 4190 | goto out; |
| 4191 | } |
| 4192 | if (!filp) { |
| 4193 | status = nfserr_openmode; |
| 4194 | goto out; |
| 4195 | } |
| 4196 | file_lock.fl_owner = (fl_owner_t)lock_sop; |
| 4197 | file_lock.fl_pid = current->tgid; |
| 4198 | file_lock.fl_file = filp; |
| 4199 | file_lock.fl_flags = FL_POSIX; |
| 4200 | file_lock.fl_lmops = &nfsd_posix_mng_ops; |
| 4201 | |
| 4202 | file_lock.fl_start = lock->lk_offset; |
| 4203 | file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); |
| 4204 | nfs4_transform_lock_offset(&file_lock); |
| 4205 | |
| 4206 | /* |
| 4207 | * Try to lock the file in the VFS. |
| 4208 | * Note: locks.c uses the BKL to protect the inode's lock list. |
| 4209 | */ |
| 4210 | |
| 4211 | err = vfs_lock_file(filp, F_SETLK, &file_lock, &conflock); |
| 4212 | switch (-err) { |
| 4213 | case 0: /* success! */ |
| 4214 | update_stateid(&lock_stp->st_stid.sc_stateid); |
| 4215 | memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid, |
| 4216 | sizeof(stateid_t)); |
| 4217 | status = 0; |
| 4218 | break; |
| 4219 | case (EAGAIN): /* conflock holds conflicting lock */ |
| 4220 | status = nfserr_denied; |
| 4221 | dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); |
| 4222 | nfs4_set_lock_denied(&conflock, &lock->lk_denied); |
| 4223 | break; |
| 4224 | case (EDEADLK): |
| 4225 | status = nfserr_deadlock; |
| 4226 | break; |
| 4227 | default: |
| 4228 | dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); |
| 4229 | status = nfserrno(err); |
| 4230 | break; |
| 4231 | } |
| 4232 | out: |
| 4233 | if (status && new_state) |
| 4234 | release_lockowner(lock_sop); |
| 4235 | if (!cstate->replay_owner) |
| 4236 | nfs4_unlock_state(); |
| 4237 | return status; |
| 4238 | } |
| 4239 | |
| 4240 | /* |
| 4241 | * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, |
| 4242 | * so we do a temporary open here just to get an open file to pass to |
| 4243 | * vfs_test_lock. (Arguably perhaps test_lock should be done with an |
| 4244 | * inode operation.) |
| 4245 | */ |
| 4246 | static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) |
| 4247 | { |
| 4248 | struct file *file; |
| 4249 | int err; |
| 4250 | |
| 4251 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
| 4252 | if (err) |
| 4253 | return err; |
| 4254 | err = vfs_test_lock(file, lock); |
| 4255 | nfsd_close(file); |
| 4256 | return err; |
| 4257 | } |
| 4258 | |
| 4259 | /* |
| 4260 | * LOCKT operation |
| 4261 | */ |
| 4262 | __be32 |
| 4263 | nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 4264 | struct nfsd4_lockt *lockt) |
| 4265 | { |
| 4266 | struct inode *inode; |
| 4267 | struct file_lock file_lock; |
| 4268 | struct nfs4_lockowner *lo; |
| 4269 | int error; |
| 4270 | __be32 status; |
| 4271 | |
| 4272 | if (locks_in_grace()) |
| 4273 | return nfserr_grace; |
| 4274 | |
| 4275 | if (check_lock_length(lockt->lt_offset, lockt->lt_length)) |
| 4276 | return nfserr_inval; |
| 4277 | |
| 4278 | nfs4_lock_state(); |
| 4279 | |
| 4280 | status = nfserr_stale_clientid; |
| 4281 | if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid)) |
| 4282 | goto out; |
| 4283 | |
| 4284 | if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) |
| 4285 | goto out; |
| 4286 | |
| 4287 | inode = cstate->current_fh.fh_dentry->d_inode; |
| 4288 | locks_init_lock(&file_lock); |
| 4289 | switch (lockt->lt_type) { |
| 4290 | case NFS4_READ_LT: |
| 4291 | case NFS4_READW_LT: |
| 4292 | file_lock.fl_type = F_RDLCK; |
| 4293 | break; |
| 4294 | case NFS4_WRITE_LT: |
| 4295 | case NFS4_WRITEW_LT: |
| 4296 | file_lock.fl_type = F_WRLCK; |
| 4297 | break; |
| 4298 | default: |
| 4299 | dprintk("NFSD: nfs4_lockt: bad lock type!\n"); |
| 4300 | status = nfserr_inval; |
| 4301 | goto out; |
| 4302 | } |
| 4303 | |
| 4304 | lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner); |
| 4305 | if (lo) |
| 4306 | file_lock.fl_owner = (fl_owner_t)lo; |
| 4307 | file_lock.fl_pid = current->tgid; |
| 4308 | file_lock.fl_flags = FL_POSIX; |
| 4309 | |
| 4310 | file_lock.fl_start = lockt->lt_offset; |
| 4311 | file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); |
| 4312 | |
| 4313 | nfs4_transform_lock_offset(&file_lock); |
| 4314 | |
| 4315 | status = nfs_ok; |
| 4316 | error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock); |
| 4317 | if (error) { |
| 4318 | status = nfserrno(error); |
| 4319 | goto out; |
| 4320 | } |
| 4321 | if (file_lock.fl_type != F_UNLCK) { |
| 4322 | status = nfserr_denied; |
| 4323 | nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); |
| 4324 | } |
| 4325 | out: |
| 4326 | nfs4_unlock_state(); |
| 4327 | return status; |
| 4328 | } |
| 4329 | |
| 4330 | __be32 |
| 4331 | nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| 4332 | struct nfsd4_locku *locku) |
| 4333 | { |
| 4334 | struct nfs4_ol_stateid *stp; |
| 4335 | struct file *filp = NULL; |
| 4336 | struct file_lock file_lock; |
| 4337 | __be32 status; |
| 4338 | int err; |
| 4339 | |
| 4340 | dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", |
| 4341 | (long long) locku->lu_offset, |
| 4342 | (long long) locku->lu_length); |
| 4343 | |
| 4344 | if (check_lock_length(locku->lu_offset, locku->lu_length)) |
| 4345 | return nfserr_inval; |
| 4346 | |
| 4347 | nfs4_lock_state(); |
| 4348 | |
| 4349 | status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid, |
| 4350 | &locku->lu_stateid, NFS4_LOCK_STID, &stp); |
| 4351 | if (status) |
| 4352 | goto out; |
| 4353 | filp = find_any_file(stp->st_file); |
| 4354 | if (!filp) { |
| 4355 | status = nfserr_lock_range; |
| 4356 | goto out; |
| 4357 | } |
| 4358 | BUG_ON(!filp); |
| 4359 | locks_init_lock(&file_lock); |
| 4360 | file_lock.fl_type = F_UNLCK; |
| 4361 | file_lock.fl_owner = (fl_owner_t)lockowner(stp->st_stateowner); |
| 4362 | file_lock.fl_pid = current->tgid; |
| 4363 | file_lock.fl_file = filp; |
| 4364 | file_lock.fl_flags = FL_POSIX; |
| 4365 | file_lock.fl_lmops = &nfsd_posix_mng_ops; |
| 4366 | file_lock.fl_start = locku->lu_offset; |
| 4367 | |
| 4368 | file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length); |
| 4369 | nfs4_transform_lock_offset(&file_lock); |
| 4370 | |
| 4371 | /* |
| 4372 | * Try to unlock the file in the VFS. |
| 4373 | */ |
| 4374 | err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); |
| 4375 | if (err) { |
| 4376 | dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); |
| 4377 | goto out_nfserr; |
| 4378 | } |
| 4379 | /* |
| 4380 | * OK, unlock succeeded; the only thing left to do is update the stateid. |
| 4381 | */ |
| 4382 | update_stateid(&stp->st_stid.sc_stateid); |
| 4383 | memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); |
| 4384 | |
| 4385 | out: |
| 4386 | if (!cstate->replay_owner) |
| 4387 | nfs4_unlock_state(); |
| 4388 | return status; |
| 4389 | |
| 4390 | out_nfserr: |
| 4391 | status = nfserrno(err); |
| 4392 | goto out; |
| 4393 | } |
| 4394 | |
| 4395 | /* |
| 4396 | * returns |
| 4397 | * 1: locks held by lockowner |
| 4398 | * 0: no locks held by lockowner |
| 4399 | */ |
| 4400 | static int |
| 4401 | check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner) |
| 4402 | { |
| 4403 | struct file_lock **flpp; |
| 4404 | struct inode *inode = filp->fi_inode; |
| 4405 | int status = 0; |
| 4406 | |
| 4407 | lock_flocks(); |
| 4408 | for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) { |
| 4409 | if ((*flpp)->fl_owner == (fl_owner_t)lowner) { |
| 4410 | status = 1; |
| 4411 | goto out; |
| 4412 | } |
| 4413 | } |
| 4414 | out: |
| 4415 | unlock_flocks(); |
| 4416 | return status; |
| 4417 | } |
| 4418 | |
| 4419 | __be32 |
| 4420 | nfsd4_release_lockowner(struct svc_rqst *rqstp, |
| 4421 | struct nfsd4_compound_state *cstate, |
| 4422 | struct nfsd4_release_lockowner *rlockowner) |
| 4423 | { |
| 4424 | clientid_t *clid = &rlockowner->rl_clientid; |
| 4425 | struct nfs4_stateowner *sop; |
| 4426 | struct nfs4_lockowner *lo; |
| 4427 | struct nfs4_ol_stateid *stp; |
| 4428 | struct xdr_netobj *owner = &rlockowner->rl_owner; |
| 4429 | struct list_head matches; |
| 4430 | unsigned int hashval = ownerstr_hashval(clid->cl_id, owner); |
| 4431 | __be32 status; |
| 4432 | |
| 4433 | dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", |
| 4434 | clid->cl_boot, clid->cl_id); |
| 4435 | |
| 4436 | /* XXX check for lease expiration */ |
| 4437 | |
| 4438 | status = nfserr_stale_clientid; |
| 4439 | if (STALE_CLIENTID(clid)) |
| 4440 | return status; |
| 4441 | |
| 4442 | nfs4_lock_state(); |
| 4443 | |
| 4444 | status = nfserr_locks_held; |
| 4445 | INIT_LIST_HEAD(&matches); |
| 4446 | |
| 4447 | list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) { |
| 4448 | if (sop->so_is_open_owner) |
| 4449 | continue; |
| 4450 | if (!same_owner_str(sop, owner, clid)) |
| 4451 | continue; |
| 4452 | list_for_each_entry(stp, &sop->so_stateids, |
| 4453 | st_perstateowner) { |
| 4454 | lo = lockowner(sop); |
| 4455 | if (check_for_locks(stp->st_file, lo)) |
| 4456 | goto out; |
| 4457 | list_add(&lo->lo_list, &matches); |
| 4458 | } |
| 4459 | } |
| 4460 | /* Clients probably won't expect us to return with some (but not all) |
| 4461 | * of the lockowner state released; so don't release any until all |
| 4462 | * have been checked. */ |
| 4463 | status = nfs_ok; |
| 4464 | while (!list_empty(&matches)) { |
| 4465 | lo = list_entry(matches.next, struct nfs4_lockowner, |
| 4466 | lo_list); |
| 4467 | /* unhash_stateowner deletes so_perclient only |
| 4468 | * for openowners. */ |
| 4469 | list_del(&lo->lo_list); |
| 4470 | release_lockowner(lo); |
| 4471 | } |
| 4472 | out: |
| 4473 | nfs4_unlock_state(); |
| 4474 | return status; |
| 4475 | } |
| 4476 | |
| 4477 | static inline struct nfs4_client_reclaim * |
| 4478 | alloc_reclaim(void) |
| 4479 | { |
| 4480 | return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); |
| 4481 | } |
| 4482 | |
| 4483 | int |
| 4484 | nfs4_has_reclaimed_state(const char *name, bool use_exchange_id) |
| 4485 | { |
| 4486 | unsigned int strhashval = clientstr_hashval(name); |
| 4487 | struct nfs4_client *clp; |
| 4488 | |
| 4489 | clp = find_confirmed_client_by_str(name, strhashval); |
| 4490 | if (!clp) |
| 4491 | return 0; |
| 4492 | return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 4493 | } |
| 4494 | |
| 4495 | /* |
| 4496 | * failure => all reset bets are off, nfserr_no_grace... |
| 4497 | */ |
| 4498 | int |
| 4499 | nfs4_client_to_reclaim(const char *name) |
| 4500 | { |
| 4501 | unsigned int strhashval; |
| 4502 | struct nfs4_client_reclaim *crp = NULL; |
| 4503 | |
| 4504 | dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); |
| 4505 | crp = alloc_reclaim(); |
| 4506 | if (!crp) |
| 4507 | return 0; |
| 4508 | strhashval = clientstr_hashval(name); |
| 4509 | INIT_LIST_HEAD(&crp->cr_strhash); |
| 4510 | list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); |
| 4511 | memcpy(crp->cr_recdir, name, HEXDIR_LEN); |
| 4512 | reclaim_str_hashtbl_size++; |
| 4513 | return 1; |
| 4514 | } |
| 4515 | |
| 4516 | void |
| 4517 | nfs4_release_reclaim(void) |
| 4518 | { |
| 4519 | struct nfs4_client_reclaim *crp = NULL; |
| 4520 | int i; |
| 4521 | |
| 4522 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { |
| 4523 | while (!list_empty(&reclaim_str_hashtbl[i])) { |
| 4524 | crp = list_entry(reclaim_str_hashtbl[i].next, |
| 4525 | struct nfs4_client_reclaim, cr_strhash); |
| 4526 | list_del(&crp->cr_strhash); |
| 4527 | kfree(crp); |
| 4528 | reclaim_str_hashtbl_size--; |
| 4529 | } |
| 4530 | } |
| 4531 | BUG_ON(reclaim_str_hashtbl_size); |
| 4532 | } |
| 4533 | |
| 4534 | /* |
| 4535 | * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ |
| 4536 | struct nfs4_client_reclaim * |
| 4537 | nfsd4_find_reclaim_client(struct nfs4_client *clp) |
| 4538 | { |
| 4539 | unsigned int strhashval; |
| 4540 | struct nfs4_client_reclaim *crp = NULL; |
| 4541 | |
| 4542 | dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", |
| 4543 | clp->cl_name.len, clp->cl_name.data, |
| 4544 | clp->cl_recdir); |
| 4545 | |
| 4546 | /* find clp->cl_name in reclaim_str_hashtbl */ |
| 4547 | strhashval = clientstr_hashval(clp->cl_recdir); |
| 4548 | list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { |
| 4549 | if (same_name(crp->cr_recdir, clp->cl_recdir)) { |
| 4550 | return crp; |
| 4551 | } |
| 4552 | } |
| 4553 | return NULL; |
| 4554 | } |
| 4555 | |
| 4556 | /* |
| 4557 | * Called from OPEN. Look for clientid in reclaim list. |
| 4558 | */ |
| 4559 | __be32 |
| 4560 | nfs4_check_open_reclaim(clientid_t *clid) |
| 4561 | { |
| 4562 | struct nfs4_client *clp; |
| 4563 | |
| 4564 | /* find clientid in conf_id_hashtbl */ |
| 4565 | clp = find_confirmed_client(clid); |
| 4566 | if (clp == NULL) |
| 4567 | return nfserr_reclaim_bad; |
| 4568 | |
| 4569 | return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok; |
| 4570 | } |
| 4571 | |
| 4572 | #ifdef CONFIG_NFSD_FAULT_INJECTION |
| 4573 | |
| 4574 | void nfsd_forget_clients(u64 num) |
| 4575 | { |
| 4576 | struct nfs4_client *clp, *next; |
| 4577 | int count = 0; |
| 4578 | |
| 4579 | nfs4_lock_state(); |
| 4580 | list_for_each_entry_safe(clp, next, &client_lru, cl_lru) { |
| 4581 | nfsd4_client_record_remove(clp); |
| 4582 | expire_client(clp); |
| 4583 | if (++count == num) |
| 4584 | break; |
| 4585 | } |
| 4586 | nfs4_unlock_state(); |
| 4587 | |
| 4588 | printk(KERN_INFO "NFSD: Forgot %d clients", count); |
| 4589 | } |
| 4590 | |
| 4591 | static void release_lockowner_sop(struct nfs4_stateowner *sop) |
| 4592 | { |
| 4593 | release_lockowner(lockowner(sop)); |
| 4594 | } |
| 4595 | |
| 4596 | static void release_openowner_sop(struct nfs4_stateowner *sop) |
| 4597 | { |
| 4598 | release_openowner(openowner(sop)); |
| 4599 | } |
| 4600 | |
| 4601 | static int nfsd_release_n_owners(u64 num, bool is_open_owner, |
| 4602 | void (*release_sop)(struct nfs4_stateowner *)) |
| 4603 | { |
| 4604 | int i, count = 0; |
| 4605 | struct nfs4_stateowner *sop, *next; |
| 4606 | |
| 4607 | for (i = 0; i < OWNER_HASH_SIZE; i++) { |
| 4608 | list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) { |
| 4609 | if (sop->so_is_open_owner != is_open_owner) |
| 4610 | continue; |
| 4611 | release_sop(sop); |
| 4612 | if (++count == num) |
| 4613 | return count; |
| 4614 | } |
| 4615 | } |
| 4616 | return count; |
| 4617 | } |
| 4618 | |
| 4619 | void nfsd_forget_locks(u64 num) |
| 4620 | { |
| 4621 | int count; |
| 4622 | |
| 4623 | nfs4_lock_state(); |
| 4624 | count = nfsd_release_n_owners(num, false, release_lockowner_sop); |
| 4625 | nfs4_unlock_state(); |
| 4626 | |
| 4627 | printk(KERN_INFO "NFSD: Forgot %d locks", count); |
| 4628 | } |
| 4629 | |
| 4630 | void nfsd_forget_openowners(u64 num) |
| 4631 | { |
| 4632 | int count; |
| 4633 | |
| 4634 | nfs4_lock_state(); |
| 4635 | count = nfsd_release_n_owners(num, true, release_openowner_sop); |
| 4636 | nfs4_unlock_state(); |
| 4637 | |
| 4638 | printk(KERN_INFO "NFSD: Forgot %d open owners", count); |
| 4639 | } |
| 4640 | |
| 4641 | int nfsd_process_n_delegations(u64 num, void (*deleg_func)(struct nfs4_delegation *)) |
| 4642 | { |
| 4643 | int i, count = 0; |
| 4644 | struct nfs4_file *fp, *fnext; |
| 4645 | struct nfs4_delegation *dp, *dnext; |
| 4646 | |
| 4647 | for (i = 0; i < FILE_HASH_SIZE; i++) { |
| 4648 | list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) { |
| 4649 | list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) { |
| 4650 | deleg_func(dp); |
| 4651 | if (++count == num) |
| 4652 | return count; |
| 4653 | } |
| 4654 | } |
| 4655 | } |
| 4656 | |
| 4657 | return count; |
| 4658 | } |
| 4659 | |
| 4660 | void nfsd_forget_delegations(u64 num) |
| 4661 | { |
| 4662 | unsigned int count; |
| 4663 | |
| 4664 | nfs4_lock_state(); |
| 4665 | count = nfsd_process_n_delegations(num, unhash_delegation); |
| 4666 | nfs4_unlock_state(); |
| 4667 | |
| 4668 | printk(KERN_INFO "NFSD: Forgot %d delegations", count); |
| 4669 | } |
| 4670 | |
| 4671 | void nfsd_recall_delegations(u64 num) |
| 4672 | { |
| 4673 | unsigned int count; |
| 4674 | |
| 4675 | nfs4_lock_state(); |
| 4676 | spin_lock(&recall_lock); |
| 4677 | count = nfsd_process_n_delegations(num, nfsd_break_one_deleg); |
| 4678 | spin_unlock(&recall_lock); |
| 4679 | nfs4_unlock_state(); |
| 4680 | |
| 4681 | printk(KERN_INFO "NFSD: Recalled %d delegations", count); |
| 4682 | } |
| 4683 | |
| 4684 | #endif /* CONFIG_NFSD_FAULT_INJECTION */ |
| 4685 | |
| 4686 | /* initialization to perform at module load time: */ |
| 4687 | |
| 4688 | void |
| 4689 | nfs4_state_init(void) |
| 4690 | { |
| 4691 | int i; |
| 4692 | |
| 4693 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { |
| 4694 | INIT_LIST_HEAD(&conf_id_hashtbl[i]); |
| 4695 | INIT_LIST_HEAD(&conf_str_hashtbl[i]); |
| 4696 | INIT_LIST_HEAD(&unconf_str_hashtbl[i]); |
| 4697 | INIT_LIST_HEAD(&unconf_id_hashtbl[i]); |
| 4698 | INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); |
| 4699 | } |
| 4700 | for (i = 0; i < SESSION_HASH_SIZE; i++) |
| 4701 | INIT_LIST_HEAD(&sessionid_hashtbl[i]); |
| 4702 | for (i = 0; i < FILE_HASH_SIZE; i++) { |
| 4703 | INIT_LIST_HEAD(&file_hashtbl[i]); |
| 4704 | } |
| 4705 | for (i = 0; i < OWNER_HASH_SIZE; i++) { |
| 4706 | INIT_LIST_HEAD(&ownerstr_hashtbl[i]); |
| 4707 | } |
| 4708 | for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++) |
| 4709 | INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]); |
| 4710 | INIT_LIST_HEAD(&close_lru); |
| 4711 | INIT_LIST_HEAD(&client_lru); |
| 4712 | INIT_LIST_HEAD(&del_recall_lru); |
| 4713 | reclaim_str_hashtbl_size = 0; |
| 4714 | } |
| 4715 | |
| 4716 | /* |
| 4717 | * Since the lifetime of a delegation isn't limited to that of an open, a |
| 4718 | * client may quite reasonably hang on to a delegation as long as it has |
| 4719 | * the inode cached. This becomes an obvious problem the first time a |
| 4720 | * client's inode cache approaches the size of the server's total memory. |
| 4721 | * |
| 4722 | * For now we avoid this problem by imposing a hard limit on the number |
| 4723 | * of delegations, which varies according to the server's memory size. |
| 4724 | */ |
| 4725 | static void |
| 4726 | set_max_delegations(void) |
| 4727 | { |
| 4728 | /* |
| 4729 | * Allow at most 4 delegations per megabyte of RAM. Quick |
| 4730 | * estimates suggest that in the worst case (where every delegation |
| 4731 | * is for a different inode), a delegation could take about 1.5K, |
| 4732 | * giving a worst case usage of about 6% of memory. |
| 4733 | */ |
| 4734 | max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); |
| 4735 | } |
| 4736 | |
| 4737 | /* initialization to perform when the nfsd service is started: */ |
| 4738 | |
| 4739 | int |
| 4740 | nfs4_state_start(void) |
| 4741 | { |
| 4742 | int ret; |
| 4743 | |
| 4744 | /* |
| 4745 | * FIXME: For now, we hang most of the pernet global stuff off of |
| 4746 | * init_net until nfsd is fully containerized. Eventually, we'll |
| 4747 | * need to pass a net pointer into this function, take a reference |
| 4748 | * to that instead and then do most of the rest of this on a per-net |
| 4749 | * basis. |
| 4750 | */ |
| 4751 | get_net(&init_net); |
| 4752 | nfsd4_client_tracking_init(&init_net); |
| 4753 | boot_time = get_seconds(); |
| 4754 | locks_start_grace(&nfsd4_manager); |
| 4755 | grace_ended = false; |
| 4756 | printk(KERN_INFO "NFSD: starting %ld-second grace period\n", |
| 4757 | nfsd4_grace); |
| 4758 | ret = set_callback_cred(); |
| 4759 | if (ret) { |
| 4760 | ret = -ENOMEM; |
| 4761 | goto out_recovery; |
| 4762 | } |
| 4763 | laundry_wq = create_singlethread_workqueue("nfsd4"); |
| 4764 | if (laundry_wq == NULL) { |
| 4765 | ret = -ENOMEM; |
| 4766 | goto out_recovery; |
| 4767 | } |
| 4768 | ret = nfsd4_create_callback_queue(); |
| 4769 | if (ret) |
| 4770 | goto out_free_laundry; |
| 4771 | queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ); |
| 4772 | set_max_delegations(); |
| 4773 | return 0; |
| 4774 | out_free_laundry: |
| 4775 | destroy_workqueue(laundry_wq); |
| 4776 | out_recovery: |
| 4777 | nfsd4_client_tracking_exit(&init_net); |
| 4778 | put_net(&init_net); |
| 4779 | return ret; |
| 4780 | } |
| 4781 | |
| 4782 | static void |
| 4783 | __nfs4_state_shutdown(void) |
| 4784 | { |
| 4785 | int i; |
| 4786 | struct nfs4_client *clp = NULL; |
| 4787 | struct nfs4_delegation *dp = NULL; |
| 4788 | struct list_head *pos, *next, reaplist; |
| 4789 | |
| 4790 | for (i = 0; i < CLIENT_HASH_SIZE; i++) { |
| 4791 | while (!list_empty(&conf_id_hashtbl[i])) { |
| 4792 | clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); |
| 4793 | expire_client(clp); |
| 4794 | } |
| 4795 | while (!list_empty(&unconf_str_hashtbl[i])) { |
| 4796 | clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); |
| 4797 | expire_client(clp); |
| 4798 | } |
| 4799 | } |
| 4800 | INIT_LIST_HEAD(&reaplist); |
| 4801 | spin_lock(&recall_lock); |
| 4802 | list_for_each_safe(pos, next, &del_recall_lru) { |
| 4803 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); |
| 4804 | list_move(&dp->dl_recall_lru, &reaplist); |
| 4805 | } |
| 4806 | spin_unlock(&recall_lock); |
| 4807 | list_for_each_safe(pos, next, &reaplist) { |
| 4808 | dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); |
| 4809 | unhash_delegation(dp); |
| 4810 | } |
| 4811 | |
| 4812 | nfsd4_client_tracking_exit(&init_net); |
| 4813 | put_net(&init_net); |
| 4814 | } |
| 4815 | |
| 4816 | void |
| 4817 | nfs4_state_shutdown(void) |
| 4818 | { |
| 4819 | cancel_delayed_work_sync(&laundromat_work); |
| 4820 | destroy_workqueue(laundry_wq); |
| 4821 | locks_end_grace(&nfsd4_manager); |
| 4822 | nfs4_lock_state(); |
| 4823 | __nfs4_state_shutdown(); |
| 4824 | nfs4_unlock_state(); |
| 4825 | nfsd4_destroy_callback_queue(); |
| 4826 | } |
| 4827 | |
| 4828 | static void |
| 4829 | get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) |
| 4830 | { |
| 4831 | if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid)) |
| 4832 | memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t)); |
| 4833 | } |
| 4834 | |
| 4835 | static void |
| 4836 | put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid) |
| 4837 | { |
| 4838 | if (cstate->minorversion) { |
| 4839 | memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t)); |
| 4840 | SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); |
| 4841 | } |
| 4842 | } |
| 4843 | |
| 4844 | void |
| 4845 | clear_current_stateid(struct nfsd4_compound_state *cstate) |
| 4846 | { |
| 4847 | CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG); |
| 4848 | } |
| 4849 | |
| 4850 | /* |
| 4851 | * functions to set current state id |
| 4852 | */ |
| 4853 | void |
| 4854 | nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp) |
| 4855 | { |
| 4856 | put_stateid(cstate, &odp->od_stateid); |
| 4857 | } |
| 4858 | |
| 4859 | void |
| 4860 | nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open) |
| 4861 | { |
| 4862 | put_stateid(cstate, &open->op_stateid); |
| 4863 | } |
| 4864 | |
| 4865 | void |
| 4866 | nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close) |
| 4867 | { |
| 4868 | put_stateid(cstate, &close->cl_stateid); |
| 4869 | } |
| 4870 | |
| 4871 | void |
| 4872 | nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock) |
| 4873 | { |
| 4874 | put_stateid(cstate, &lock->lk_resp_stateid); |
| 4875 | } |
| 4876 | |
| 4877 | /* |
| 4878 | * functions to consume current state id |
| 4879 | */ |
| 4880 | |
| 4881 | void |
| 4882 | nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp) |
| 4883 | { |
| 4884 | get_stateid(cstate, &odp->od_stateid); |
| 4885 | } |
| 4886 | |
| 4887 | void |
| 4888 | nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp) |
| 4889 | { |
| 4890 | get_stateid(cstate, &drp->dr_stateid); |
| 4891 | } |
| 4892 | |
| 4893 | void |
| 4894 | nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp) |
| 4895 | { |
| 4896 | get_stateid(cstate, &fsp->fr_stateid); |
| 4897 | } |
| 4898 | |
| 4899 | void |
| 4900 | nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr) |
| 4901 | { |
| 4902 | get_stateid(cstate, &setattr->sa_stateid); |
| 4903 | } |
| 4904 | |
| 4905 | void |
| 4906 | nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close) |
| 4907 | { |
| 4908 | get_stateid(cstate, &close->cl_stateid); |
| 4909 | } |
| 4910 | |
| 4911 | void |
| 4912 | nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku) |
| 4913 | { |
| 4914 | get_stateid(cstate, &locku->lu_stateid); |
| 4915 | } |
| 4916 | |
| 4917 | void |
| 4918 | nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read) |
| 4919 | { |
| 4920 | get_stateid(cstate, &read->rd_stateid); |
| 4921 | } |
| 4922 | |
| 4923 | void |
| 4924 | nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write) |
| 4925 | { |
| 4926 | get_stateid(cstate, &write->wr_stateid); |
| 4927 | } |