1 /* 2 * linux/fs/nfs/inode.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * nfs inode and superblock handling functions 7 * 8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs. 10 * 11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. 12 * J.S.Peatfield@damtp.cam.ac.uk 13 * 14 */ 15 16 #include <linux/config.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 20 #include <linux/time.h> 21 #include <linux/kernel.h> 22 #include <linux/mm.h> 23 #include <linux/string.h> 24 #include <linux/stat.h> 25 #include <linux/errno.h> 26 #include <linux/unistd.h> 27 #include <linux/sunrpc/clnt.h> 28 #include <linux/sunrpc/stats.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/smp_lock.h> 34 #include <linux/seq_file.h> 35 #include <linux/mount.h> 36 #include <linux/nfs_idmap.h> 37 #include <linux/vfs.h> 38 39 #include <asm/system.h> 40 #include <asm/uaccess.h> 41 42 #include "delegation.h" 43 44 #define NFSDBG_FACILITY NFSDBG_VFS 45 #define NFS_PARANOIA 1 46 47 /* Maximum number of readahead requests 48 * FIXME: this should really be a sysctl so that users may tune it to suit 49 * their needs. People that do NFS over a slow network, might for 50 * instance want to reduce it to something closer to 1 for improved 51 * interactive response. 52 */ 53 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 54 55 static void nfs_invalidate_inode(struct inode *); 56 static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long); 57 58 static struct inode *nfs_alloc_inode(struct super_block *sb); 59 static void nfs_destroy_inode(struct inode *); 60 static int nfs_write_inode(struct inode *,int); 61 static void nfs_delete_inode(struct inode *); 62 static void nfs_clear_inode(struct inode *); 63 static void nfs_umount_begin(struct super_block *); 64 static int nfs_statfs(struct super_block *, struct kstatfs *); 65 static int nfs_show_options(struct seq_file *, struct vfsmount *); 66 67 static struct rpc_program nfs_program; 68 69 static struct super_operations nfs_sops = { 70 .alloc_inode = nfs_alloc_inode, 71 .destroy_inode = nfs_destroy_inode, 72 .write_inode = nfs_write_inode, 73 .delete_inode = nfs_delete_inode, 74 .statfs = nfs_statfs, 75 .clear_inode = nfs_clear_inode, 76 .umount_begin = nfs_umount_begin, 77 .show_options = nfs_show_options, 78 }; 79 80 /* 81 * RPC cruft for NFS 82 */ 83 static struct rpc_stat nfs_rpcstat = { 84 .program = &nfs_program 85 }; 86 static struct rpc_version * nfs_version[] = { 87 NULL, 88 NULL, 89 &nfs_version2, 90 #if defined(CONFIG_NFS_V3) 91 &nfs_version3, 92 #elif defined(CONFIG_NFS_V4) 93 NULL, 94 #endif 95 #if defined(CONFIG_NFS_V4) 96 &nfs_version4, 97 #endif 98 }; 99 100 static struct rpc_program nfs_program = { 101 .name = "nfs", 102 .number = NFS_PROGRAM, 103 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]), 104 .version = nfs_version, 105 .stats = &nfs_rpcstat, 106 .pipe_dir_name = "/nfs", 107 }; 108 109 static inline unsigned long 110 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 111 { 112 return nfs_fileid_to_ino_t(fattr->fileid); 113 } 114 115 static int 116 nfs_write_inode(struct inode *inode, int sync) 117 { 118 int flags = sync ? FLUSH_WAIT : 0; 119 int ret; 120 121 ret = nfs_commit_inode(inode, 0, 0, flags); 122 if (ret < 0) 123 return ret; 124 return 0; 125 } 126 127 static void 128 nfs_delete_inode(struct inode * inode) 129 { 130 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); 131 132 nfs_wb_all(inode); 133 /* 134 * The following should never happen... 135 */ 136 if (nfs_have_writebacks(inode)) { 137 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino); 138 } 139 140 clear_inode(inode); 141 } 142 143 /* 144 * For the moment, the only task for the NFS clear_inode method is to 145 * release the mmap credential 146 */ 147 static void 148 nfs_clear_inode(struct inode *inode) 149 { 150 struct nfs_inode *nfsi = NFS_I(inode); 151 struct rpc_cred *cred; 152 153 nfs_wb_all(inode); 154 BUG_ON (!list_empty(&nfsi->open_files)); 155 cred = nfsi->cache_access.cred; 156 if (cred) 157 put_rpccred(cred); 158 BUG_ON(atomic_read(&nfsi->data_updates) != 0); 159 } 160 161 void 162 nfs_umount_begin(struct super_block *sb) 163 { 164 struct nfs_server *server = NFS_SB(sb); 165 struct rpc_clnt *rpc; 166 167 /* -EIO all pending I/O */ 168 if ((rpc = server->client) != NULL) 169 rpc_killall_tasks(rpc); 170 } 171 172 173 static inline unsigned long 174 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 175 { 176 /* make sure blocksize is a power of two */ 177 if ((bsize & (bsize - 1)) || nrbitsp) { 178 unsigned char nrbits; 179 180 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 181 ; 182 bsize = 1 << nrbits; 183 if (nrbitsp) 184 *nrbitsp = nrbits; 185 } 186 187 return bsize; 188 } 189 190 /* 191 * Calculate the number of 512byte blocks used. 192 */ 193 static inline unsigned long 194 nfs_calc_block_size(u64 tsize) 195 { 196 loff_t used = (tsize + 511) >> 9; 197 return (used > ULONG_MAX) ? ULONG_MAX : used; 198 } 199 200 /* 201 * Compute and set NFS server blocksize 202 */ 203 static inline unsigned long 204 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 205 { 206 if (bsize < 1024) 207 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE; 208 else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE) 209 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE; 210 211 return nfs_block_bits(bsize, nrbitsp); 212 } 213 214 /* 215 * Obtain the root inode of the file system. 216 */ 217 static struct inode * 218 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) 219 { 220 struct nfs_server *server = NFS_SB(sb); 221 struct inode *rooti; 222 int error; 223 224 error = server->rpc_ops->getroot(server, rootfh, fsinfo); 225 if (error < 0) { 226 dprintk("nfs_get_root: getattr error = %d\n", -error); 227 return ERR_PTR(error); 228 } 229 230 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr); 231 if (!rooti) 232 return ERR_PTR(-ENOMEM); 233 return rooti; 234 } 235 236 /* 237 * Do NFS version-independent mount processing, and sanity checking 238 */ 239 static int 240 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor) 241 { 242 struct nfs_server *server; 243 struct inode *root_inode; 244 struct nfs_fattr fattr; 245 struct nfs_fsinfo fsinfo = { 246 .fattr = &fattr, 247 }; 248 struct nfs_pathconf pathinfo = { 249 .fattr = &fattr, 250 }; 251 int no_root_error = 0; 252 unsigned long max_rpc_payload; 253 254 /* We probably want something more informative here */ 255 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 256 257 server = NFS_SB(sb); 258 259 sb->s_magic = NFS_SUPER_MAGIC; 260 261 root_inode = nfs_get_root(sb, &server->fh, &fsinfo); 262 /* Did getting the root inode fail? */ 263 if (IS_ERR(root_inode)) { 264 no_root_error = PTR_ERR(root_inode); 265 goto out_no_root; 266 } 267 sb->s_root = d_alloc_root(root_inode); 268 if (!sb->s_root) { 269 no_root_error = -ENOMEM; 270 goto out_no_root; 271 } 272 sb->s_root->d_op = server->rpc_ops->dentry_ops; 273 274 /* Get some general file system info */ 275 if (server->namelen == 0 && 276 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0) 277 server->namelen = pathinfo.max_namelen; 278 /* Work out a lot of parameters */ 279 if (server->rsize == 0) 280 server->rsize = nfs_block_size(fsinfo.rtpref, NULL); 281 if (server->wsize == 0) 282 server->wsize = nfs_block_size(fsinfo.wtpref, NULL); 283 284 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax) 285 server->rsize = nfs_block_size(fsinfo.rtmax, NULL); 286 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax) 287 server->wsize = nfs_block_size(fsinfo.wtmax, NULL); 288 289 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 290 if (server->rsize > max_rpc_payload) 291 server->rsize = max_rpc_payload; 292 if (server->wsize > max_rpc_payload) 293 server->wsize = max_rpc_payload; 294 295 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 296 if (server->rpages > NFS_READ_MAXIOV) { 297 server->rpages = NFS_READ_MAXIOV; 298 server->rsize = server->rpages << PAGE_CACHE_SHIFT; 299 } 300 301 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 302 if (server->wpages > NFS_WRITE_MAXIOV) { 303 server->wpages = NFS_WRITE_MAXIOV; 304 server->wsize = server->wpages << PAGE_CACHE_SHIFT; 305 } 306 307 if (sb->s_blocksize == 0) 308 sb->s_blocksize = nfs_block_bits(server->wsize, 309 &sb->s_blocksize_bits); 310 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL); 311 312 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL); 313 if (server->dtsize > PAGE_CACHE_SIZE) 314 server->dtsize = PAGE_CACHE_SIZE; 315 if (server->dtsize > server->rsize) 316 server->dtsize = server->rsize; 317 318 if (server->flags & NFS_MOUNT_NOAC) { 319 server->acregmin = server->acregmax = 0; 320 server->acdirmin = server->acdirmax = 0; 321 sb->s_flags |= MS_SYNCHRONOUS; 322 } 323 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 324 325 sb->s_maxbytes = fsinfo.maxfilesize; 326 if (sb->s_maxbytes > MAX_LFS_FILESIZE) 327 sb->s_maxbytes = MAX_LFS_FILESIZE; 328 329 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; 330 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; 331 332 /* We're airborne Set socket buffersize */ 333 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 334 return 0; 335 /* Yargs. It didn't work out. */ 336 out_no_root: 337 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error); 338 if (!IS_ERR(root_inode)) 339 iput(root_inode); 340 return no_root_error; 341 } 342 343 /* 344 * Create an RPC client handle. 345 */ 346 static struct rpc_clnt * 347 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) 348 { 349 struct rpc_timeout timeparms; 350 struct rpc_xprt *xprt = NULL; 351 struct rpc_clnt *clnt = NULL; 352 int tcp = (data->flags & NFS_MOUNT_TCP); 353 354 /* Initialize timeout values */ 355 timeparms.to_initval = data->timeo * HZ / 10; 356 timeparms.to_retries = data->retrans; 357 timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT; 358 timeparms.to_exponential = 1; 359 360 if (!timeparms.to_initval) 361 timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10; 362 if (!timeparms.to_retries) 363 timeparms.to_retries = 5; 364 365 /* create transport and client */ 366 xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP, 367 &server->addr, &timeparms); 368 if (IS_ERR(xprt)) { 369 printk(KERN_WARNING "NFS: cannot create RPC transport.\n"); 370 return (struct rpc_clnt *)xprt; 371 } 372 clnt = rpc_create_client(xprt, server->hostname, &nfs_program, 373 server->rpc_ops->version, data->pseudoflavor); 374 if (IS_ERR(clnt)) { 375 printk(KERN_WARNING "NFS: cannot create RPC client.\n"); 376 goto out_fail; 377 } 378 379 clnt->cl_intr = 1; 380 clnt->cl_softrtry = 1; 381 clnt->cl_chatty = 1; 382 383 return clnt; 384 385 out_fail: 386 xprt_destroy(xprt); 387 return clnt; 388 } 389 390 /* 391 * The way this works is that the mount process passes a structure 392 * in the data argument which contains the server's IP address 393 * and the root file handle obtained from the server's mount 394 * daemon. We stash these away in the private superblock fields. 395 */ 396 static int 397 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) 398 { 399 struct nfs_server *server; 400 rpc_authflavor_t authflavor; 401 402 server = NFS_SB(sb); 403 sb->s_blocksize_bits = 0; 404 sb->s_blocksize = 0; 405 if (data->bsize) 406 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 407 if (data->rsize) 408 server->rsize = nfs_block_size(data->rsize, NULL); 409 if (data->wsize) 410 server->wsize = nfs_block_size(data->wsize, NULL); 411 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 412 413 server->acregmin = data->acregmin*HZ; 414 server->acregmax = data->acregmax*HZ; 415 server->acdirmin = data->acdirmin*HZ; 416 server->acdirmax = data->acdirmax*HZ; 417 418 /* Start lockd here, before we might error out */ 419 if (!(server->flags & NFS_MOUNT_NONLM)) 420 lockd_up(); 421 422 server->namelen = data->namlen; 423 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL); 424 if (!server->hostname) 425 return -ENOMEM; 426 strcpy(server->hostname, data->hostname); 427 428 /* Check NFS protocol revision and initialize RPC op vector 429 * and file handle pool. */ 430 if (server->flags & NFS_MOUNT_VER3) { 431 #ifdef CONFIG_NFS_V3 432 server->rpc_ops = &nfs_v3_clientops; 433 server->caps |= NFS_CAP_READDIRPLUS; 434 if (data->version < 4) { 435 printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n"); 436 return -EIO; 437 } 438 #else 439 printk(KERN_NOTICE "NFS: NFSv3 not supported.\n"); 440 return -EIO; 441 #endif 442 } else { 443 server->rpc_ops = &nfs_v2_clientops; 444 } 445 446 /* Fill in pseudoflavor for mount version < 5 */ 447 if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) 448 data->pseudoflavor = RPC_AUTH_UNIX; 449 authflavor = data->pseudoflavor; /* save for sb_init() */ 450 /* XXX maybe we want to add a server->pseudoflavor field */ 451 452 /* Create RPC client handles */ 453 server->client = nfs_create_client(server, data); 454 if (IS_ERR(server->client)) 455 return PTR_ERR(server->client); 456 /* RFC 2623, sec 2.3.2 */ 457 if (authflavor != RPC_AUTH_UNIX) { 458 server->client_sys = rpc_clone_client(server->client); 459 if (IS_ERR(server->client_sys)) 460 return PTR_ERR(server->client_sys); 461 if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys)) 462 return -ENOMEM; 463 } else { 464 atomic_inc(&server->client->cl_count); 465 server->client_sys = server->client; 466 } 467 468 if (server->flags & NFS_MOUNT_VER3) { 469 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 470 server->namelen = NFS3_MAXNAMLEN; 471 sb->s_time_gran = 1; 472 } else { 473 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 474 server->namelen = NFS2_MAXNAMLEN; 475 } 476 477 sb->s_op = &nfs_sops; 478 return nfs_sb_init(sb, authflavor); 479 } 480 481 static int 482 nfs_statfs(struct super_block *sb, struct kstatfs *buf) 483 { 484 struct nfs_server *server = NFS_SB(sb); 485 unsigned char blockbits; 486 unsigned long blockres; 487 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode); 488 struct nfs_fattr fattr; 489 struct nfs_fsstat res = { 490 .fattr = &fattr, 491 }; 492 int error; 493 494 lock_kernel(); 495 496 error = server->rpc_ops->statfs(server, rootfh, &res); 497 buf->f_type = NFS_SUPER_MAGIC; 498 if (error < 0) 499 goto out_err; 500 501 /* 502 * Current versions of glibc do not correctly handle the 503 * case where f_frsize != f_bsize. Eventually we want to 504 * report the value of wtmult in this field. 505 */ 506 buf->f_frsize = sb->s_blocksize; 507 508 /* 509 * On most *nix systems, f_blocks, f_bfree, and f_bavail 510 * are reported in units of f_frsize. Linux hasn't had 511 * an f_frsize field in its statfs struct until recently, 512 * thus historically Linux's sys_statfs reports these 513 * fields in units of f_bsize. 514 */ 515 buf->f_bsize = sb->s_blocksize; 516 blockbits = sb->s_blocksize_bits; 517 blockres = (1 << blockbits) - 1; 518 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 519 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 520 buf->f_bavail = (res.abytes + blockres) >> blockbits; 521 522 buf->f_files = res.tfiles; 523 buf->f_ffree = res.afiles; 524 525 buf->f_namelen = server->namelen; 526 out: 527 unlock_kernel(); 528 529 return 0; 530 531 out_err: 532 printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error); 533 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; 534 goto out; 535 536 } 537 538 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 539 { 540 static struct proc_nfs_info { 541 int flag; 542 char *str; 543 char *nostr; 544 } nfs_info[] = { 545 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 546 { NFS_MOUNT_INTR, ",intr", "" }, 547 { NFS_MOUNT_POSIX, ",posix", "" }, 548 { NFS_MOUNT_TCP, ",tcp", ",udp" }, 549 { NFS_MOUNT_NOCTO, ",nocto", "" }, 550 { NFS_MOUNT_NOAC, ",noac", "" }, 551 { NFS_MOUNT_NONLM, ",nolock", ",lock" }, 552 { 0, NULL, NULL } 553 }; 554 struct proc_nfs_info *nfs_infop; 555 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 556 557 seq_printf(m, ",v%d", nfss->rpc_ops->version); 558 seq_printf(m, ",rsize=%d", nfss->rsize); 559 seq_printf(m, ",wsize=%d", nfss->wsize); 560 if (nfss->acregmin != 3*HZ) 561 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); 562 if (nfss->acregmax != 60*HZ) 563 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); 564 if (nfss->acdirmin != 30*HZ) 565 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); 566 if (nfss->acdirmax != 60*HZ) 567 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); 568 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 569 if (nfss->flags & nfs_infop->flag) 570 seq_puts(m, nfs_infop->str); 571 else 572 seq_puts(m, nfs_infop->nostr); 573 } 574 seq_puts(m, ",addr="); 575 seq_escape(m, nfss->hostname, " \t\n\\"); 576 return 0; 577 } 578 579 /* 580 * Invalidate the local caches 581 */ 582 void 583 nfs_zap_caches(struct inode *inode) 584 { 585 struct nfs_inode *nfsi = NFS_I(inode); 586 int mode = inode->i_mode; 587 588 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); 589 NFS_ATTRTIMEO_UPDATE(inode) = jiffies; 590 591 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 592 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 593 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS; 594 else 595 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; 596 } 597 598 /* 599 * Invalidate, but do not unhash, the inode 600 */ 601 static void 602 nfs_invalidate_inode(struct inode *inode) 603 { 604 umode_t save_mode = inode->i_mode; 605 606 make_bad_inode(inode); 607 inode->i_mode = save_mode; 608 nfs_zap_caches(inode); 609 } 610 611 struct nfs_find_desc { 612 struct nfs_fh *fh; 613 struct nfs_fattr *fattr; 614 }; 615 616 /* 617 * In NFSv3 we can have 64bit inode numbers. In order to support 618 * this, and re-exported directories (also seen in NFSv2) 619 * we are forced to allow 2 different inodes to have the same 620 * i_ino. 621 */ 622 static int 623 nfs_find_actor(struct inode *inode, void *opaque) 624 { 625 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 626 struct nfs_fh *fh = desc->fh; 627 struct nfs_fattr *fattr = desc->fattr; 628 629 if (NFS_FILEID(inode) != fattr->fileid) 630 return 0; 631 if (nfs_compare_fh(NFS_FH(inode), fh)) 632 return 0; 633 if (is_bad_inode(inode) || NFS_STALE(inode)) 634 return 0; 635 return 1; 636 } 637 638 static int 639 nfs_init_locked(struct inode *inode, void *opaque) 640 { 641 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 642 struct nfs_fattr *fattr = desc->fattr; 643 644 NFS_FILEID(inode) = fattr->fileid; 645 nfs_copy_fh(NFS_FH(inode), desc->fh); 646 return 0; 647 } 648 649 /* Don't use READDIRPLUS on directories that we believe are too large */ 650 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) 651 652 /* 653 * This is our front-end to iget that looks up inodes by file handle 654 * instead of inode number. 655 */ 656 struct inode * 657 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 658 { 659 struct nfs_find_desc desc = { 660 .fh = fh, 661 .fattr = fattr 662 }; 663 struct inode *inode = NULL; 664 unsigned long hash; 665 666 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 667 goto out_no_inode; 668 669 if (!fattr->nlink) { 670 printk("NFS: Buggy server - nlink == 0!\n"); 671 goto out_no_inode; 672 } 673 674 hash = nfs_fattr_to_ino_t(fattr); 675 676 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc))) 677 goto out_no_inode; 678 679 if (inode->i_state & I_NEW) { 680 struct nfs_inode *nfsi = NFS_I(inode); 681 682 /* We set i_ino for the few things that still rely on it, 683 * such as stat(2) */ 684 inode->i_ino = hash; 685 686 /* We can't support update_atime(), since the server will reset it */ 687 inode->i_flags |= S_NOATIME|S_NOCMTIME; 688 inode->i_mode = fattr->mode; 689 /* Why so? Because we want revalidate for devices/FIFOs, and 690 * that's precisely what we have in nfs_file_inode_operations. 691 */ 692 inode->i_op = &nfs_file_inode_operations; 693 if (S_ISREG(inode->i_mode)) { 694 inode->i_fop = &nfs_file_operations; 695 inode->i_data.a_ops = &nfs_file_aops; 696 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 697 } else if (S_ISDIR(inode->i_mode)) { 698 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops; 699 inode->i_fop = &nfs_dir_operations; 700 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) 701 && fattr->size <= NFS_LIMIT_READDIRPLUS) 702 NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS; 703 } else if (S_ISLNK(inode->i_mode)) 704 inode->i_op = &nfs_symlink_inode_operations; 705 else 706 init_special_inode(inode, inode->i_mode, fattr->rdev); 707 708 nfsi->read_cache_jiffies = fattr->timestamp; 709 inode->i_atime = fattr->atime; 710 inode->i_mtime = fattr->mtime; 711 inode->i_ctime = fattr->ctime; 712 if (fattr->valid & NFS_ATTR_FATTR_V4) 713 nfsi->change_attr = fattr->change_attr; 714 inode->i_size = nfs_size_to_loff_t(fattr->size); 715 inode->i_nlink = fattr->nlink; 716 inode->i_uid = fattr->uid; 717 inode->i_gid = fattr->gid; 718 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 719 /* 720 * report the blocks in 512byte units 721 */ 722 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 723 inode->i_blksize = inode->i_sb->s_blocksize; 724 } else { 725 inode->i_blocks = fattr->du.nfs2.blocks; 726 inode->i_blksize = fattr->du.nfs2.blocksize; 727 } 728 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 729 nfsi->attrtimeo_timestamp = jiffies; 730 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 731 nfsi->cache_access.cred = NULL; 732 733 unlock_new_inode(inode); 734 } else 735 nfs_refresh_inode(inode, fattr); 736 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", 737 inode->i_sb->s_id, 738 (long long)NFS_FILEID(inode), 739 atomic_read(&inode->i_count)); 740 741 out: 742 return inode; 743 744 out_no_inode: 745 printk("nfs_fhget: iget failed\n"); 746 goto out; 747 } 748 749 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) 750 751 int 752 nfs_setattr(struct dentry *dentry, struct iattr *attr) 753 { 754 struct inode *inode = dentry->d_inode; 755 struct nfs_fattr fattr; 756 int error; 757 758 if (attr->ia_valid & ATTR_SIZE) { 759 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 760 attr->ia_valid &= ~ATTR_SIZE; 761 } 762 763 /* Optimization: if the end result is no change, don't RPC */ 764 attr->ia_valid &= NFS_VALID_ATTRS; 765 if (attr->ia_valid == 0) 766 return 0; 767 768 lock_kernel(); 769 nfs_begin_data_update(inode); 770 /* Write all dirty data if we're changing file permissions or size */ 771 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) { 772 if (filemap_fdatawrite(inode->i_mapping) == 0) 773 filemap_fdatawait(inode->i_mapping); 774 nfs_wb_all(inode); 775 } 776 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); 777 if (error == 0) { 778 nfs_refresh_inode(inode, &fattr); 779 if ((attr->ia_valid & ATTR_MODE) != 0) { 780 int mode; 781 mode = inode->i_mode & ~S_IALLUGO; 782 mode |= attr->ia_mode & S_IALLUGO; 783 inode->i_mode = mode; 784 } 785 if ((attr->ia_valid & ATTR_UID) != 0) 786 inode->i_uid = attr->ia_uid; 787 if ((attr->ia_valid & ATTR_GID) != 0) 788 inode->i_gid = attr->ia_gid; 789 if ((attr->ia_valid & ATTR_SIZE) != 0) { 790 inode->i_size = attr->ia_size; 791 vmtruncate(inode, attr->ia_size); 792 } 793 } 794 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 795 NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS; 796 nfs_end_data_update(inode); 797 unlock_kernel(); 798 return error; 799 } 800 801 /* 802 * Wait for the inode to get unlocked. 803 * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING). 804 */ 805 static int 806 nfs_wait_on_inode(struct inode *inode, int flag) 807 { 808 struct rpc_clnt *clnt = NFS_CLIENT(inode); 809 struct nfs_inode *nfsi = NFS_I(inode); 810 811 int error; 812 if (!(NFS_FLAGS(inode) & flag)) 813 return 0; 814 atomic_inc(&inode->i_count); 815 error = nfs_wait_event(clnt, nfsi->nfs_i_wait, 816 !(NFS_FLAGS(inode) & flag)); 817 iput(inode); 818 return error; 819 } 820 821 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 822 { 823 struct inode *inode = dentry->d_inode; 824 struct nfs_inode *nfsi = NFS_I(inode); 825 int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME; 826 int err; 827 828 if (__IS_FLG(inode, MS_NOATIME)) 829 need_atime = 0; 830 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode)) 831 need_atime = 0; 832 /* We may force a getattr if the user cares about atime */ 833 if (need_atime) 834 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 835 else 836 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 837 if (!err) 838 generic_fillattr(inode, stat); 839 return err; 840 } 841 842 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred) 843 { 844 struct nfs_open_context *ctx; 845 846 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL); 847 if (ctx != NULL) { 848 atomic_set(&ctx->count, 1); 849 ctx->dentry = dget(dentry); 850 ctx->cred = get_rpccred(cred); 851 ctx->state = NULL; 852 ctx->lockowner = current->files; 853 ctx->error = 0; 854 init_waitqueue_head(&ctx->waitq); 855 } 856 return ctx; 857 } 858 859 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 860 { 861 if (ctx != NULL) 862 atomic_inc(&ctx->count); 863 return ctx; 864 } 865 866 void put_nfs_open_context(struct nfs_open_context *ctx) 867 { 868 if (atomic_dec_and_test(&ctx->count)) { 869 if (!list_empty(&ctx->list)) { 870 struct inode *inode = ctx->dentry->d_inode; 871 spin_lock(&inode->i_lock); 872 list_del(&ctx->list); 873 spin_unlock(&inode->i_lock); 874 } 875 if (ctx->state != NULL) 876 nfs4_close_state(ctx->state, ctx->mode); 877 if (ctx->cred != NULL) 878 put_rpccred(ctx->cred); 879 dput(ctx->dentry); 880 kfree(ctx); 881 } 882 } 883 884 /* 885 * Ensure that mmap has a recent RPC credential for use when writing out 886 * shared pages 887 */ 888 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 889 { 890 struct inode *inode = filp->f_dentry->d_inode; 891 struct nfs_inode *nfsi = NFS_I(inode); 892 893 filp->private_data = get_nfs_open_context(ctx); 894 spin_lock(&inode->i_lock); 895 list_add(&ctx->list, &nfsi->open_files); 896 spin_unlock(&inode->i_lock); 897 } 898 899 struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode) 900 { 901 struct nfs_inode *nfsi = NFS_I(inode); 902 struct nfs_open_context *pos, *ctx = NULL; 903 904 spin_lock(&inode->i_lock); 905 list_for_each_entry(pos, &nfsi->open_files, list) { 906 if ((pos->mode & mode) == mode) { 907 ctx = get_nfs_open_context(pos); 908 break; 909 } 910 } 911 spin_unlock(&inode->i_lock); 912 return ctx; 913 } 914 915 void nfs_file_clear_open_context(struct file *filp) 916 { 917 struct inode *inode = filp->f_dentry->d_inode; 918 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data; 919 920 if (ctx) { 921 filp->private_data = NULL; 922 spin_lock(&inode->i_lock); 923 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 924 spin_unlock(&inode->i_lock); 925 put_nfs_open_context(ctx); 926 } 927 } 928 929 /* 930 * These allocate and release file read/write context information. 931 */ 932 int nfs_open(struct inode *inode, struct file *filp) 933 { 934 struct nfs_open_context *ctx; 935 struct rpc_cred *cred; 936 937 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); 938 if (IS_ERR(cred)) 939 return PTR_ERR(cred); 940 ctx = alloc_nfs_open_context(filp->f_dentry, cred); 941 put_rpccred(cred); 942 if (ctx == NULL) 943 return -ENOMEM; 944 ctx->mode = filp->f_mode; 945 nfs_file_set_open_context(filp, ctx); 946 put_nfs_open_context(ctx); 947 if ((filp->f_mode & FMODE_WRITE) != 0) 948 nfs_begin_data_update(inode); 949 return 0; 950 } 951 952 int nfs_release(struct inode *inode, struct file *filp) 953 { 954 if ((filp->f_mode & FMODE_WRITE) != 0) 955 nfs_end_data_update(inode); 956 nfs_file_clear_open_context(filp); 957 return 0; 958 } 959 960 /* 961 * This function is called whenever some part of NFS notices that 962 * the cached attributes have to be refreshed. 963 */ 964 int 965 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 966 { 967 int status = -ESTALE; 968 struct nfs_fattr fattr; 969 struct nfs_inode *nfsi = NFS_I(inode); 970 unsigned long verifier; 971 unsigned int flags; 972 973 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 974 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 975 976 lock_kernel(); 977 if (!inode || is_bad_inode(inode)) 978 goto out_nowait; 979 if (NFS_STALE(inode)) 980 goto out_nowait; 981 982 while (NFS_REVALIDATING(inode)) { 983 status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING); 984 if (status < 0) 985 goto out_nowait; 986 if (NFS_ATTRTIMEO(inode) == 0) 987 continue; 988 if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) 989 continue; 990 status = NFS_STALE(inode) ? -ESTALE : 0; 991 goto out_nowait; 992 } 993 NFS_FLAGS(inode) |= NFS_INO_REVALIDATING; 994 995 /* Protect against RPC races by saving the change attribute */ 996 verifier = nfs_save_change_attribute(inode); 997 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); 998 if (status != 0) { 999 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 1000 inode->i_sb->s_id, 1001 (long long)NFS_FILEID(inode), status); 1002 if (status == -ESTALE) { 1003 nfs_zap_caches(inode); 1004 if (!S_ISDIR(inode->i_mode)) 1005 NFS_FLAGS(inode) |= NFS_INO_STALE; 1006 } 1007 goto out; 1008 } 1009 1010 status = nfs_update_inode(inode, &fattr, verifier); 1011 if (status) { 1012 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 1013 inode->i_sb->s_id, 1014 (long long)NFS_FILEID(inode), status); 1015 goto out; 1016 } 1017 flags = nfsi->flags; 1018 /* 1019 * We may need to keep the attributes marked as invalid if 1020 * we raced with nfs_end_attr_update(). 1021 */ 1022 if (verifier == nfsi->cache_change_attribute) 1023 nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME); 1024 /* Do the page cache invalidation */ 1025 if (flags & NFS_INO_INVALID_DATA) { 1026 if (S_ISREG(inode->i_mode)) { 1027 if (filemap_fdatawrite(inode->i_mapping) == 0) 1028 filemap_fdatawait(inode->i_mapping); 1029 nfs_wb_all(inode); 1030 } 1031 nfsi->flags &= ~NFS_INO_INVALID_DATA; 1032 invalidate_inode_pages2(inode->i_mapping); 1033 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 1034 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 1035 inode->i_sb->s_id, 1036 (long long)NFS_FILEID(inode)); 1037 /* This ensures we revalidate dentries */ 1038 nfsi->cache_change_attribute++; 1039 } 1040 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 1041 inode->i_sb->s_id, 1042 (long long)NFS_FILEID(inode)); 1043 1044 out: 1045 NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING; 1046 wake_up(&nfsi->nfs_i_wait); 1047 out_nowait: 1048 unlock_kernel(); 1049 return status; 1050 } 1051 1052 int nfs_attribute_timeout(struct inode *inode) 1053 { 1054 struct nfs_inode *nfsi = NFS_I(inode); 1055 1056 if (nfs_have_delegation(inode, FMODE_READ)) 1057 return 0; 1058 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo); 1059 } 1060 1061 /** 1062 * nfs_revalidate_inode - Revalidate the inode attributes 1063 * @server - pointer to nfs_server struct 1064 * @inode - pointer to inode struct 1065 * 1066 * Updates inode attribute information by retrieving the data from the server. 1067 */ 1068 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1069 { 1070 if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) 1071 && !nfs_attribute_timeout(inode)) 1072 return NFS_STALE(inode) ? -ESTALE : 0; 1073 return __nfs_revalidate_inode(server, inode); 1074 } 1075 1076 /** 1077 * nfs_begin_data_update 1078 * @inode - pointer to inode 1079 * Declare that a set of operations will update file data on the server 1080 */ 1081 void nfs_begin_data_update(struct inode *inode) 1082 { 1083 atomic_inc(&NFS_I(inode)->data_updates); 1084 } 1085 1086 /** 1087 * nfs_end_data_update 1088 * @inode - pointer to inode 1089 * Declare end of the operations that will update file data 1090 * This will mark the inode as immediately needing revalidation 1091 * of its attribute cache. 1092 */ 1093 void nfs_end_data_update(struct inode *inode) 1094 { 1095 struct nfs_inode *nfsi = NFS_I(inode); 1096 1097 if (!nfs_have_delegation(inode, FMODE_READ)) { 1098 /* Mark the attribute cache for revalidation */ 1099 nfsi->flags |= NFS_INO_INVALID_ATTR; 1100 /* Directories and symlinks: invalidate page cache too */ 1101 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) 1102 nfsi->flags |= NFS_INO_INVALID_DATA; 1103 } 1104 nfsi->cache_change_attribute ++; 1105 atomic_dec(&nfsi->data_updates); 1106 } 1107 1108 /** 1109 * nfs_end_data_update_defer 1110 * @inode - pointer to inode 1111 * Declare end of the operations that will update file data 1112 * This will defer marking the inode as needing revalidation 1113 * unless there are no other pending updates. 1114 */ 1115 void nfs_end_data_update_defer(struct inode *inode) 1116 { 1117 struct nfs_inode *nfsi = NFS_I(inode); 1118 1119 if (atomic_dec_and_test(&nfsi->data_updates)) { 1120 /* Mark the attribute cache for revalidation */ 1121 nfsi->flags |= NFS_INO_INVALID_ATTR; 1122 /* Directories and symlinks: invalidate page cache too */ 1123 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) 1124 nfsi->flags |= NFS_INO_INVALID_DATA; 1125 nfsi->cache_change_attribute ++; 1126 } 1127 } 1128 1129 /** 1130 * nfs_refresh_inode - verify consistency of the inode attribute cache 1131 * @inode - pointer to inode 1132 * @fattr - updated attributes 1133 * 1134 * Verifies the attribute cache. If we have just changed the attributes, 1135 * so that fattr carries weak cache consistency data, then it may 1136 * also update the ctime/mtime/change_attribute. 1137 */ 1138 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1139 { 1140 struct nfs_inode *nfsi = NFS_I(inode); 1141 loff_t cur_size, new_isize; 1142 int data_unstable; 1143 1144 /* Do we hold a delegation? */ 1145 if (nfs_have_delegation(inode, FMODE_READ)) 1146 return 0; 1147 1148 /* Are we in the process of updating data on the server? */ 1149 data_unstable = nfs_caches_unstable(inode); 1150 1151 if (fattr->valid & NFS_ATTR_FATTR_V4) { 1152 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0 1153 && nfsi->change_attr == fattr->pre_change_attr) 1154 nfsi->change_attr = fattr->change_attr; 1155 if (!data_unstable && nfsi->change_attr != fattr->change_attr) 1156 nfsi->flags |= NFS_INO_INVALID_ATTR; 1157 } 1158 1159 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1160 return 0; 1161 1162 /* Has the inode gone and changed behind our back? */ 1163 if (nfsi->fileid != fattr->fileid 1164 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1165 return -EIO; 1166 1167 cur_size = i_size_read(inode); 1168 new_isize = nfs_size_to_loff_t(fattr->size); 1169 1170 /* If we have atomic WCC data, we may update some attributes */ 1171 if ((fattr->valid & NFS_ATTR_WCC) != 0) { 1172 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) 1173 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1174 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) 1175 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1176 } 1177 1178 /* Verify a few of the more important attributes */ 1179 if (!data_unstable) { 1180 if (!timespec_equal(&inode->i_mtime, &fattr->mtime) 1181 || cur_size != new_isize) 1182 nfsi->flags |= NFS_INO_INVALID_ATTR; 1183 } else if (S_ISREG(inode->i_mode) && new_isize > cur_size) 1184 nfsi->flags |= NFS_INO_INVALID_ATTR; 1185 1186 /* Have any file permissions changed? */ 1187 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) 1188 || inode->i_uid != fattr->uid 1189 || inode->i_gid != fattr->gid) 1190 nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS; 1191 1192 /* Has the link count changed? */ 1193 if (inode->i_nlink != fattr->nlink) 1194 nfsi->flags |= NFS_INO_INVALID_ATTR; 1195 1196 if (!timespec_equal(&inode->i_atime, &fattr->atime)) 1197 nfsi->flags |= NFS_INO_INVALID_ATIME; 1198 1199 nfsi->read_cache_jiffies = fattr->timestamp; 1200 return 0; 1201 } 1202 1203 /* 1204 * Many nfs protocol calls return the new file attributes after 1205 * an operation. Here we update the inode to reflect the state 1206 * of the server's inode. 1207 * 1208 * This is a bit tricky because we have to make sure all dirty pages 1209 * have been sent off to the server before calling invalidate_inode_pages. 1210 * To make sure no other process adds more write requests while we try 1211 * our best to flush them, we make them sleep during the attribute refresh. 1212 * 1213 * A very similar scenario holds for the dir cache. 1214 */ 1215 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier) 1216 { 1217 struct nfs_inode *nfsi = NFS_I(inode); 1218 __u64 new_size; 1219 loff_t new_isize; 1220 unsigned int invalid = 0; 1221 loff_t cur_isize; 1222 int data_unstable; 1223 1224 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", 1225 __FUNCTION__, inode->i_sb->s_id, inode->i_ino, 1226 atomic_read(&inode->i_count), fattr->valid); 1227 1228 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1229 return 0; 1230 1231 if (nfsi->fileid != fattr->fileid) { 1232 printk(KERN_ERR "%s: inode number mismatch\n" 1233 "expected (%s/0x%Lx), got (%s/0x%Lx)\n", 1234 __FUNCTION__, 1235 inode->i_sb->s_id, (long long)nfsi->fileid, 1236 inode->i_sb->s_id, (long long)fattr->fileid); 1237 goto out_err; 1238 } 1239 1240 /* 1241 * Make sure the inode's type hasn't changed. 1242 */ 1243 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1244 goto out_changed; 1245 1246 /* 1247 * Update the read time so we don't revalidate too often. 1248 */ 1249 nfsi->read_cache_jiffies = fattr->timestamp; 1250 1251 /* Are we racing with known updates of the metadata on the server? */ 1252 data_unstable = ! nfs_verify_change_attribute(inode, verifier); 1253 1254 /* Check if the file size agrees */ 1255 new_size = fattr->size; 1256 new_isize = nfs_size_to_loff_t(fattr->size); 1257 cur_isize = i_size_read(inode); 1258 if (cur_isize != new_size) { 1259 #ifdef NFS_DEBUG_VERBOSE 1260 printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); 1261 #endif 1262 /* 1263 * If we have pending writebacks, things can get 1264 * messy. 1265 */ 1266 if (S_ISREG(inode->i_mode) && data_unstable) { 1267 if (new_isize > cur_isize) { 1268 inode->i_size = new_isize; 1269 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1270 } 1271 } else { 1272 inode->i_size = new_isize; 1273 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1274 } 1275 } 1276 1277 /* 1278 * Note: we don't check inode->i_mtime since pipes etc. 1279 * can change this value in VFS without requiring a 1280 * cache revalidation. 1281 */ 1282 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 1283 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1284 #ifdef NFS_DEBUG_VERBOSE 1285 printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); 1286 #endif 1287 if (!data_unstable) 1288 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1289 } 1290 1291 if ((fattr->valid & NFS_ATTR_FATTR_V4) 1292 && nfsi->change_attr != fattr->change_attr) { 1293 #ifdef NFS_DEBUG_VERBOSE 1294 printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n", 1295 inode->i_sb->s_id, inode->i_ino); 1296 #endif 1297 nfsi->change_attr = fattr->change_attr; 1298 if (!data_unstable) 1299 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS; 1300 } 1301 1302 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1303 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1304 1305 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || 1306 inode->i_uid != fattr->uid || 1307 inode->i_gid != fattr->gid) 1308 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; 1309 1310 inode->i_mode = fattr->mode; 1311 inode->i_nlink = fattr->nlink; 1312 inode->i_uid = fattr->uid; 1313 inode->i_gid = fattr->gid; 1314 1315 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 1316 /* 1317 * report the blocks in 512byte units 1318 */ 1319 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1320 inode->i_blksize = inode->i_sb->s_blocksize; 1321 } else { 1322 inode->i_blocks = fattr->du.nfs2.blocks; 1323 inode->i_blksize = fattr->du.nfs2.blocksize; 1324 } 1325 1326 /* Update attrtimeo value if we're out of the unstable period */ 1327 if (invalid & NFS_INO_INVALID_ATTR) { 1328 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1329 nfsi->attrtimeo_timestamp = jiffies; 1330 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) { 1331 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1332 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1333 nfsi->attrtimeo_timestamp = jiffies; 1334 } 1335 /* Don't invalidate the data if we were to blame */ 1336 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1337 || S_ISLNK(inode->i_mode))) 1338 invalid &= ~NFS_INO_INVALID_DATA; 1339 if (!nfs_have_delegation(inode, FMODE_READ)) 1340 nfsi->flags |= invalid; 1341 1342 return 0; 1343 out_changed: 1344 /* 1345 * Big trouble! The inode has become a different object. 1346 */ 1347 #ifdef NFS_PARANOIA 1348 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", 1349 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); 1350 #endif 1351 /* 1352 * No need to worry about unhashing the dentry, as the 1353 * lookup validation will know that the inode is bad. 1354 * (But we fall through to invalidate the caches.) 1355 */ 1356 nfs_invalidate_inode(inode); 1357 out_err: 1358 NFS_FLAGS(inode) |= NFS_INO_STALE; 1359 return -ESTALE; 1360 } 1361 1362 /* 1363 * File system information 1364 */ 1365 1366 static int nfs_set_super(struct super_block *s, void *data) 1367 { 1368 s->s_fs_info = data; 1369 return set_anon_super(s, data); 1370 } 1371 1372 static int nfs_compare_super(struct super_block *sb, void *data) 1373 { 1374 struct nfs_server *server = data; 1375 struct nfs_server *old = NFS_SB(sb); 1376 1377 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) 1378 return 0; 1379 if (old->addr.sin_port != server->addr.sin_port) 1380 return 0; 1381 return !nfs_compare_fh(&old->fh, &server->fh); 1382 } 1383 1384 static struct super_block *nfs_get_sb(struct file_system_type *fs_type, 1385 int flags, const char *dev_name, void *raw_data) 1386 { 1387 int error; 1388 struct nfs_server *server; 1389 struct super_block *s; 1390 struct nfs_fh *root; 1391 struct nfs_mount_data *data = raw_data; 1392 1393 if (!data) { 1394 printk("nfs_read_super: missing data argument\n"); 1395 return ERR_PTR(-EINVAL); 1396 } 1397 1398 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); 1399 if (!server) 1400 return ERR_PTR(-ENOMEM); 1401 memset(server, 0, sizeof(struct nfs_server)); 1402 /* Zero out the NFS state stuff */ 1403 init_nfsv4_state(server); 1404 1405 if (data->version != NFS_MOUNT_VERSION) { 1406 printk("nfs warning: mount version %s than kernel\n", 1407 data->version < NFS_MOUNT_VERSION ? "older" : "newer"); 1408 if (data->version < 2) 1409 data->namlen = 0; 1410 if (data->version < 3) 1411 data->bsize = 0; 1412 if (data->version < 4) { 1413 data->flags &= ~NFS_MOUNT_VER3; 1414 data->root.size = NFS2_FHSIZE; 1415 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1416 } 1417 if (data->version < 5) 1418 data->flags &= ~NFS_MOUNT_SECFLAVOUR; 1419 } 1420 1421 root = &server->fh; 1422 if (data->flags & NFS_MOUNT_VER3) 1423 root->size = data->root.size; 1424 else 1425 root->size = NFS2_FHSIZE; 1426 if (root->size > sizeof(root->data)) { 1427 printk("nfs_get_sb: invalid root filehandle\n"); 1428 kfree(server); 1429 return ERR_PTR(-EINVAL); 1430 } 1431 memcpy(root->data, data->root.data, root->size); 1432 1433 /* We now require that the mount process passes the remote address */ 1434 memcpy(&server->addr, &data->addr, sizeof(server->addr)); 1435 if (server->addr.sin_addr.s_addr == INADDR_ANY) { 1436 printk("NFS: mount program didn't pass remote address!\n"); 1437 kfree(server); 1438 return ERR_PTR(-EINVAL); 1439 } 1440 1441 s = sget(fs_type, nfs_compare_super, nfs_set_super, server); 1442 1443 if (IS_ERR(s) || s->s_root) { 1444 kfree(server); 1445 return s; 1446 } 1447 1448 s->s_flags = flags; 1449 1450 /* Fire up rpciod if not yet running */ 1451 if (rpciod_up() != 0) { 1452 printk(KERN_WARNING "NFS: couldn't start rpciod!\n"); 1453 kfree(server); 1454 return ERR_PTR(-EIO); 1455 } 1456 1457 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); 1458 if (error) { 1459 up_write(&s->s_umount); 1460 deactivate_super(s); 1461 return ERR_PTR(error); 1462 } 1463 s->s_flags |= MS_ACTIVE; 1464 return s; 1465 } 1466 1467 static void nfs_kill_super(struct super_block *s) 1468 { 1469 struct nfs_server *server = NFS_SB(s); 1470 1471 kill_anon_super(s); 1472 1473 if (server->client != NULL && !IS_ERR(server->client)) 1474 rpc_shutdown_client(server->client); 1475 if (server->client_sys != NULL && !IS_ERR(server->client_sys)) 1476 rpc_shutdown_client(server->client_sys); 1477 1478 if (!(server->flags & NFS_MOUNT_NONLM)) 1479 lockd_down(); /* release rpc.lockd */ 1480 1481 rpciod_down(); /* release rpciod */ 1482 1483 if (server->hostname != NULL) 1484 kfree(server->hostname); 1485 kfree(server); 1486 } 1487 1488 static struct file_system_type nfs_fs_type = { 1489 .owner = THIS_MODULE, 1490 .name = "nfs", 1491 .get_sb = nfs_get_sb, 1492 .kill_sb = nfs_kill_super, 1493 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 1494 }; 1495 1496 #ifdef CONFIG_NFS_V4 1497 1498 static void nfs4_clear_inode(struct inode *); 1499 1500 1501 static struct super_operations nfs4_sops = { 1502 .alloc_inode = nfs_alloc_inode, 1503 .destroy_inode = nfs_destroy_inode, 1504 .write_inode = nfs_write_inode, 1505 .delete_inode = nfs_delete_inode, 1506 .statfs = nfs_statfs, 1507 .clear_inode = nfs4_clear_inode, 1508 .umount_begin = nfs_umount_begin, 1509 .show_options = nfs_show_options, 1510 }; 1511 1512 /* 1513 * Clean out any remaining NFSv4 state that might be left over due 1514 * to open() calls that passed nfs_atomic_lookup, but failed to call 1515 * nfs_open(). 1516 */ 1517 static void nfs4_clear_inode(struct inode *inode) 1518 { 1519 struct nfs_inode *nfsi = NFS_I(inode); 1520 1521 /* If we are holding a delegation, return it! */ 1522 if (nfsi->delegation != NULL) 1523 nfs_inode_return_delegation(inode); 1524 /* First call standard NFS clear_inode() code */ 1525 nfs_clear_inode(inode); 1526 /* Now clear out any remaining state */ 1527 while (!list_empty(&nfsi->open_states)) { 1528 struct nfs4_state *state; 1529 1530 state = list_entry(nfsi->open_states.next, 1531 struct nfs4_state, 1532 inode_states); 1533 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n", 1534 __FUNCTION__, 1535 inode->i_sb->s_id, 1536 (long long)NFS_FILEID(inode), 1537 state); 1538 BUG_ON(atomic_read(&state->count) != 1); 1539 nfs4_close_state(state, state->state); 1540 } 1541 } 1542 1543 1544 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) 1545 { 1546 struct nfs_server *server; 1547 struct nfs4_client *clp = NULL; 1548 struct rpc_xprt *xprt = NULL; 1549 struct rpc_clnt *clnt = NULL; 1550 struct rpc_timeout timeparms; 1551 rpc_authflavor_t authflavour; 1552 int proto, err = -EIO; 1553 1554 sb->s_blocksize_bits = 0; 1555 sb->s_blocksize = 0; 1556 server = NFS_SB(sb); 1557 if (data->rsize != 0) 1558 server->rsize = nfs_block_size(data->rsize, NULL); 1559 if (data->wsize != 0) 1560 server->wsize = nfs_block_size(data->wsize, NULL); 1561 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 1562 server->caps = NFS_CAP_ATOMIC_OPEN; 1563 1564 server->acregmin = data->acregmin*HZ; 1565 server->acregmax = data->acregmax*HZ; 1566 server->acdirmin = data->acdirmin*HZ; 1567 server->acdirmax = data->acdirmax*HZ; 1568 1569 server->rpc_ops = &nfs_v4_clientops; 1570 /* Initialize timeout values */ 1571 1572 timeparms.to_initval = data->timeo * HZ / 10; 1573 timeparms.to_retries = data->retrans; 1574 timeparms.to_exponential = 1; 1575 if (!timeparms.to_retries) 1576 timeparms.to_retries = 5; 1577 1578 proto = data->proto; 1579 /* Which IP protocol do we use? */ 1580 switch (proto) { 1581 case IPPROTO_TCP: 1582 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT; 1583 if (!timeparms.to_initval) 1584 timeparms.to_initval = 600 * HZ / 10; 1585 break; 1586 case IPPROTO_UDP: 1587 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT; 1588 if (!timeparms.to_initval) 1589 timeparms.to_initval = 11 * HZ / 10; 1590 break; 1591 default: 1592 return -EINVAL; 1593 } 1594 1595 clp = nfs4_get_client(&server->addr.sin_addr); 1596 if (!clp) { 1597 printk(KERN_WARNING "NFS: failed to create NFS4 client.\n"); 1598 return -EIO; 1599 } 1600 1601 /* Now create transport and client */ 1602 authflavour = RPC_AUTH_UNIX; 1603 if (data->auth_flavourlen != 0) { 1604 if (data->auth_flavourlen > 1) 1605 printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n"); 1606 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { 1607 err = -EFAULT; 1608 goto out_fail; 1609 } 1610 } 1611 1612 down_write(&clp->cl_sem); 1613 if (clp->cl_rpcclient == NULL) { 1614 xprt = xprt_create_proto(proto, &server->addr, &timeparms); 1615 if (IS_ERR(xprt)) { 1616 up_write(&clp->cl_sem); 1617 printk(KERN_WARNING "NFS: cannot create RPC transport.\n"); 1618 err = PTR_ERR(xprt); 1619 goto out_fail; 1620 } 1621 clnt = rpc_create_client(xprt, server->hostname, &nfs_program, 1622 server->rpc_ops->version, authflavour); 1623 if (IS_ERR(clnt)) { 1624 up_write(&clp->cl_sem); 1625 printk(KERN_WARNING "NFS: cannot create RPC client.\n"); 1626 xprt_destroy(xprt); 1627 err = PTR_ERR(clnt); 1628 goto out_fail; 1629 } 1630 clnt->cl_intr = 1; 1631 clnt->cl_softrtry = 1; 1632 clnt->cl_chatty = 1; 1633 clp->cl_rpcclient = clnt; 1634 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0); 1635 if (IS_ERR(clp->cl_cred)) { 1636 up_write(&clp->cl_sem); 1637 err = PTR_ERR(clp->cl_cred); 1638 clp->cl_cred = NULL; 1639 goto out_fail; 1640 } 1641 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); 1642 nfs_idmap_new(clp); 1643 } 1644 if (list_empty(&clp->cl_superblocks)) { 1645 err = nfs4_init_client(clp); 1646 if (err != 0) { 1647 up_write(&clp->cl_sem); 1648 goto out_fail; 1649 } 1650 } 1651 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); 1652 clnt = rpc_clone_client(clp->cl_rpcclient); 1653 if (!IS_ERR(clnt)) 1654 server->nfs4_state = clp; 1655 up_write(&clp->cl_sem); 1656 clp = NULL; 1657 1658 if (IS_ERR(clnt)) { 1659 printk(KERN_WARNING "NFS: cannot create RPC client.\n"); 1660 return PTR_ERR(clnt); 1661 } 1662 1663 server->client = clnt; 1664 1665 if (server->nfs4_state->cl_idmap == NULL) { 1666 printk(KERN_WARNING "NFS: failed to create idmapper.\n"); 1667 return -ENOMEM; 1668 } 1669 1670 if (clnt->cl_auth->au_flavor != authflavour) { 1671 if (rpcauth_create(authflavour, clnt) == NULL) { 1672 printk(KERN_WARNING "NFS: couldn't create credcache!\n"); 1673 return -ENOMEM; 1674 } 1675 } 1676 1677 sb->s_time_gran = 1; 1678 1679 sb->s_op = &nfs4_sops; 1680 err = nfs_sb_init(sb, authflavour); 1681 if (err == 0) 1682 return 0; 1683 out_fail: 1684 if (clp) 1685 nfs4_put_client(clp); 1686 return err; 1687 } 1688 1689 static int nfs4_compare_super(struct super_block *sb, void *data) 1690 { 1691 struct nfs_server *server = data; 1692 struct nfs_server *old = NFS_SB(sb); 1693 1694 if (strcmp(server->hostname, old->hostname) != 0) 1695 return 0; 1696 if (strcmp(server->mnt_path, old->mnt_path) != 0) 1697 return 0; 1698 return 1; 1699 } 1700 1701 static void * 1702 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) 1703 { 1704 void *p = NULL; 1705 1706 if (!src->len) 1707 return ERR_PTR(-EINVAL); 1708 if (src->len < maxlen) 1709 maxlen = src->len; 1710 if (dst == NULL) { 1711 p = dst = kmalloc(maxlen + 1, GFP_KERNEL); 1712 if (p == NULL) 1713 return ERR_PTR(-ENOMEM); 1714 } 1715 if (copy_from_user(dst, src->data, maxlen)) { 1716 if (p != NULL) 1717 kfree(p); 1718 return ERR_PTR(-EFAULT); 1719 } 1720 dst[maxlen] = '\0'; 1721 return dst; 1722 } 1723 1724 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type, 1725 int flags, const char *dev_name, void *raw_data) 1726 { 1727 int error; 1728 struct nfs_server *server; 1729 struct super_block *s; 1730 struct nfs4_mount_data *data = raw_data; 1731 void *p; 1732 1733 if (!data) { 1734 printk("nfs_read_super: missing data argument\n"); 1735 return ERR_PTR(-EINVAL); 1736 } 1737 1738 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); 1739 if (!server) 1740 return ERR_PTR(-ENOMEM); 1741 memset(server, 0, sizeof(struct nfs_server)); 1742 /* Zero out the NFS state stuff */ 1743 init_nfsv4_state(server); 1744 1745 if (data->version != NFS4_MOUNT_VERSION) { 1746 printk("nfs warning: mount version %s than kernel\n", 1747 data->version < NFS4_MOUNT_VERSION ? "older" : "newer"); 1748 } 1749 1750 p = nfs_copy_user_string(NULL, &data->hostname, 256); 1751 if (IS_ERR(p)) 1752 goto out_err; 1753 server->hostname = p; 1754 1755 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); 1756 if (IS_ERR(p)) 1757 goto out_err; 1758 server->mnt_path = p; 1759 1760 p = nfs_copy_user_string(server->ip_addr, &data->client_addr, 1761 sizeof(server->ip_addr) - 1); 1762 if (IS_ERR(p)) 1763 goto out_err; 1764 1765 /* We now require that the mount process passes the remote address */ 1766 if (data->host_addrlen != sizeof(server->addr)) { 1767 s = ERR_PTR(-EINVAL); 1768 goto out_free; 1769 } 1770 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { 1771 s = ERR_PTR(-EFAULT); 1772 goto out_free; 1773 } 1774 if (server->addr.sin_family != AF_INET || 1775 server->addr.sin_addr.s_addr == INADDR_ANY) { 1776 printk("NFS: mount program didn't pass remote IP address!\n"); 1777 s = ERR_PTR(-EINVAL); 1778 goto out_free; 1779 } 1780 1781 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); 1782 1783 if (IS_ERR(s) || s->s_root) 1784 goto out_free; 1785 1786 s->s_flags = flags; 1787 1788 /* Fire up rpciod if not yet running */ 1789 if (rpciod_up() != 0) { 1790 printk(KERN_WARNING "NFS: couldn't start rpciod!\n"); 1791 s = ERR_PTR(-EIO); 1792 goto out_free; 1793 } 1794 1795 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); 1796 if (error) { 1797 up_write(&s->s_umount); 1798 deactivate_super(s); 1799 return ERR_PTR(error); 1800 } 1801 s->s_flags |= MS_ACTIVE; 1802 return s; 1803 out_err: 1804 s = (struct super_block *)p; 1805 out_free: 1806 if (server->mnt_path) 1807 kfree(server->mnt_path); 1808 if (server->hostname) 1809 kfree(server->hostname); 1810 kfree(server); 1811 return s; 1812 } 1813 1814 static void nfs4_kill_super(struct super_block *sb) 1815 { 1816 struct nfs_server *server = NFS_SB(sb); 1817 1818 nfs_return_all_delegations(sb); 1819 kill_anon_super(sb); 1820 1821 nfs4_renewd_prepare_shutdown(server); 1822 1823 if (server->client != NULL && !IS_ERR(server->client)) 1824 rpc_shutdown_client(server->client); 1825 rpciod_down(); /* release rpciod */ 1826 1827 destroy_nfsv4_state(server); 1828 1829 if (server->hostname != NULL) 1830 kfree(server->hostname); 1831 kfree(server); 1832 } 1833 1834 static struct file_system_type nfs4_fs_type = { 1835 .owner = THIS_MODULE, 1836 .name = "nfs4", 1837 .get_sb = nfs4_get_sb, 1838 .kill_sb = nfs4_kill_super, 1839 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 1840 }; 1841 1842 #define nfs4_init_once(nfsi) \ 1843 do { \ 1844 INIT_LIST_HEAD(&(nfsi)->open_states); \ 1845 nfsi->delegation = NULL; \ 1846 nfsi->delegation_state = 0; \ 1847 init_rwsem(&nfsi->rwsem); \ 1848 } while(0) 1849 #define register_nfs4fs() register_filesystem(&nfs4_fs_type) 1850 #define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type) 1851 #else 1852 #define nfs4_init_once(nfsi) \ 1853 do { } while (0) 1854 #define register_nfs4fs() (0) 1855 #define unregister_nfs4fs() 1856 #endif 1857 1858 extern int nfs_init_nfspagecache(void); 1859 extern void nfs_destroy_nfspagecache(void); 1860 extern int nfs_init_readpagecache(void); 1861 extern void nfs_destroy_readpagecache(void); 1862 extern int nfs_init_writepagecache(void); 1863 extern void nfs_destroy_writepagecache(void); 1864 #ifdef CONFIG_NFS_DIRECTIO 1865 extern int nfs_init_directcache(void); 1866 extern void nfs_destroy_directcache(void); 1867 #endif 1868 1869 static kmem_cache_t * nfs_inode_cachep; 1870 1871 static struct inode *nfs_alloc_inode(struct super_block *sb) 1872 { 1873 struct nfs_inode *nfsi; 1874 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL); 1875 if (!nfsi) 1876 return NULL; 1877 nfsi->flags = 0; 1878 return &nfsi->vfs_inode; 1879 } 1880 1881 static void nfs_destroy_inode(struct inode *inode) 1882 { 1883 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1884 } 1885 1886 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 1887 { 1888 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1889 1890 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 1891 SLAB_CTOR_CONSTRUCTOR) { 1892 inode_init_once(&nfsi->vfs_inode); 1893 spin_lock_init(&nfsi->req_lock); 1894 INIT_LIST_HEAD(&nfsi->dirty); 1895 INIT_LIST_HEAD(&nfsi->commit); 1896 INIT_LIST_HEAD(&nfsi->open_files); 1897 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); 1898 atomic_set(&nfsi->data_updates, 0); 1899 nfsi->ndirty = 0; 1900 nfsi->ncommit = 0; 1901 nfsi->npages = 0; 1902 init_waitqueue_head(&nfsi->nfs_i_wait); 1903 nfs4_init_once(nfsi); 1904 } 1905 } 1906 1907 int nfs_init_inodecache(void) 1908 { 1909 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1910 sizeof(struct nfs_inode), 1911 0, SLAB_RECLAIM_ACCOUNT, 1912 init_once, NULL); 1913 if (nfs_inode_cachep == NULL) 1914 return -ENOMEM; 1915 1916 return 0; 1917 } 1918 1919 void nfs_destroy_inodecache(void) 1920 { 1921 if (kmem_cache_destroy(nfs_inode_cachep)) 1922 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n"); 1923 } 1924 1925 /* 1926 * Initialize NFS 1927 */ 1928 static int __init init_nfs_fs(void) 1929 { 1930 int err; 1931 1932 err = nfs_init_nfspagecache(); 1933 if (err) 1934 goto out4; 1935 1936 err = nfs_init_inodecache(); 1937 if (err) 1938 goto out3; 1939 1940 err = nfs_init_readpagecache(); 1941 if (err) 1942 goto out2; 1943 1944 err = nfs_init_writepagecache(); 1945 if (err) 1946 goto out1; 1947 1948 #ifdef CONFIG_NFS_DIRECTIO 1949 err = nfs_init_directcache(); 1950 if (err) 1951 goto out0; 1952 #endif 1953 1954 #ifdef CONFIG_PROC_FS 1955 rpc_proc_register(&nfs_rpcstat); 1956 #endif 1957 err = register_filesystem(&nfs_fs_type); 1958 if (err) 1959 goto out; 1960 if ((err = register_nfs4fs()) != 0) 1961 goto out; 1962 return 0; 1963 out: 1964 #ifdef CONFIG_PROC_FS 1965 rpc_proc_unregister("nfs"); 1966 #endif 1967 nfs_destroy_writepagecache(); 1968 #ifdef CONFIG_NFS_DIRECTIO 1969 out0: 1970 nfs_destroy_directcache(); 1971 #endif 1972 out1: 1973 nfs_destroy_readpagecache(); 1974 out2: 1975 nfs_destroy_inodecache(); 1976 out3: 1977 nfs_destroy_nfspagecache(); 1978 out4: 1979 return err; 1980 } 1981 1982 static void __exit exit_nfs_fs(void) 1983 { 1984 #ifdef CONFIG_NFS_DIRECTIO 1985 nfs_destroy_directcache(); 1986 #endif 1987 nfs_destroy_writepagecache(); 1988 nfs_destroy_readpagecache(); 1989 nfs_destroy_inodecache(); 1990 nfs_destroy_nfspagecache(); 1991 #ifdef CONFIG_PROC_FS 1992 rpc_proc_unregister("nfs"); 1993 #endif 1994 unregister_filesystem(&nfs_fs_type); 1995 unregister_nfs4fs(); 1996 } 1997 1998 /* Not quite true; I just maintain it */ 1999 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2000 MODULE_LICENSE("GPL"); 2001 2002 module_init(init_nfs_fs) 2003 module_exit(exit_nfs_fs) 2004