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 "nfs4_fs.h" 43 #include "delegation.h" 44 45 #define NFSDBG_FACILITY NFSDBG_VFS 46 #define NFS_PARANOIA 1 47 48 /* Maximum number of readahead requests 49 * FIXME: this should really be a sysctl so that users may tune it to suit 50 * their needs. People that do NFS over a slow network, might for 51 * instance want to reduce it to something closer to 1 for improved 52 * interactive response. 53 */ 54 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 55 56 static void nfs_invalidate_inode(struct inode *); 57 static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long); 58 59 static struct inode *nfs_alloc_inode(struct super_block *sb); 60 static void nfs_destroy_inode(struct inode *); 61 static int nfs_write_inode(struct inode *,int); 62 static void nfs_delete_inode(struct inode *); 63 static void nfs_clear_inode(struct inode *); 64 static void nfs_umount_begin(struct super_block *); 65 static int nfs_statfs(struct super_block *, struct kstatfs *); 66 static int nfs_show_options(struct seq_file *, struct vfsmount *); 67 static void nfs_zap_acl_cache(struct inode *); 68 69 static struct rpc_program nfs_program; 70 71 static struct super_operations nfs_sops = { 72 .alloc_inode = nfs_alloc_inode, 73 .destroy_inode = nfs_destroy_inode, 74 .write_inode = nfs_write_inode, 75 .delete_inode = nfs_delete_inode, 76 .statfs = nfs_statfs, 77 .clear_inode = nfs_clear_inode, 78 .umount_begin = nfs_umount_begin, 79 .show_options = nfs_show_options, 80 }; 81 82 /* 83 * RPC cruft for NFS 84 */ 85 static struct rpc_stat nfs_rpcstat = { 86 .program = &nfs_program 87 }; 88 static struct rpc_version * nfs_version[] = { 89 NULL, 90 NULL, 91 &nfs_version2, 92 #if defined(CONFIG_NFS_V3) 93 &nfs_version3, 94 #elif defined(CONFIG_NFS_V4) 95 NULL, 96 #endif 97 #if defined(CONFIG_NFS_V4) 98 &nfs_version4, 99 #endif 100 }; 101 102 static struct rpc_program nfs_program = { 103 .name = "nfs", 104 .number = NFS_PROGRAM, 105 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]), 106 .version = nfs_version, 107 .stats = &nfs_rpcstat, 108 .pipe_dir_name = "/nfs", 109 }; 110 111 #ifdef CONFIG_NFS_V3_ACL 112 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 113 static struct rpc_version * nfsacl_version[] = { 114 [3] = &nfsacl_version3, 115 }; 116 117 struct rpc_program nfsacl_program = { 118 .name = "nfsacl", 119 .number = NFS_ACL_PROGRAM, 120 .nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]), 121 .version = nfsacl_version, 122 .stats = &nfsacl_rpcstat, 123 }; 124 #endif /* CONFIG_NFS_V3_ACL */ 125 126 static inline unsigned long 127 nfs_fattr_to_ino_t(struct nfs_fattr *fattr) 128 { 129 return nfs_fileid_to_ino_t(fattr->fileid); 130 } 131 132 static int 133 nfs_write_inode(struct inode *inode, int sync) 134 { 135 int flags = sync ? FLUSH_WAIT : 0; 136 int ret; 137 138 ret = nfs_commit_inode(inode, flags); 139 if (ret < 0) 140 return ret; 141 return 0; 142 } 143 144 static void 145 nfs_delete_inode(struct inode * inode) 146 { 147 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); 148 149 nfs_wb_all(inode); 150 /* 151 * The following should never happen... 152 */ 153 if (nfs_have_writebacks(inode)) { 154 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino); 155 } 156 157 clear_inode(inode); 158 } 159 160 static void 161 nfs_clear_inode(struct inode *inode) 162 { 163 struct nfs_inode *nfsi = NFS_I(inode); 164 struct rpc_cred *cred; 165 166 nfs_wb_all(inode); 167 BUG_ON (!list_empty(&nfsi->open_files)); 168 nfs_zap_acl_cache(inode); 169 cred = nfsi->cache_access.cred; 170 if (cred) 171 put_rpccred(cred); 172 BUG_ON(atomic_read(&nfsi->data_updates) != 0); 173 } 174 175 void 176 nfs_umount_begin(struct super_block *sb) 177 { 178 struct rpc_clnt *rpc = NFS_SB(sb)->client; 179 180 /* -EIO all pending I/O */ 181 if (!IS_ERR(rpc)) 182 rpc_killall_tasks(rpc); 183 rpc = NFS_SB(sb)->client_acl; 184 if (!IS_ERR(rpc)) 185 rpc_killall_tasks(rpc); 186 } 187 188 189 static inline unsigned long 190 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 191 { 192 /* make sure blocksize is a power of two */ 193 if ((bsize & (bsize - 1)) || nrbitsp) { 194 unsigned char nrbits; 195 196 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 197 ; 198 bsize = 1 << nrbits; 199 if (nrbitsp) 200 *nrbitsp = nrbits; 201 } 202 203 return bsize; 204 } 205 206 /* 207 * Calculate the number of 512byte blocks used. 208 */ 209 static inline unsigned long 210 nfs_calc_block_size(u64 tsize) 211 { 212 loff_t used = (tsize + 511) >> 9; 213 return (used > ULONG_MAX) ? ULONG_MAX : used; 214 } 215 216 /* 217 * Compute and set NFS server blocksize 218 */ 219 static inline unsigned long 220 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 221 { 222 if (bsize < 1024) 223 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE; 224 else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE) 225 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE; 226 227 return nfs_block_bits(bsize, nrbitsp); 228 } 229 230 /* 231 * Obtain the root inode of the file system. 232 */ 233 static struct inode * 234 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) 235 { 236 struct nfs_server *server = NFS_SB(sb); 237 struct inode *rooti; 238 int error; 239 240 error = server->rpc_ops->getroot(server, rootfh, fsinfo); 241 if (error < 0) { 242 dprintk("nfs_get_root: getattr error = %d\n", -error); 243 return ERR_PTR(error); 244 } 245 246 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr); 247 if (!rooti) 248 return ERR_PTR(-ENOMEM); 249 return rooti; 250 } 251 252 /* 253 * Do NFS version-independent mount processing, and sanity checking 254 */ 255 static int 256 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor) 257 { 258 struct nfs_server *server; 259 struct inode *root_inode; 260 struct nfs_fattr fattr; 261 struct nfs_fsinfo fsinfo = { 262 .fattr = &fattr, 263 }; 264 struct nfs_pathconf pathinfo = { 265 .fattr = &fattr, 266 }; 267 int no_root_error = 0; 268 unsigned long max_rpc_payload; 269 270 /* We probably want something more informative here */ 271 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); 272 273 server = NFS_SB(sb); 274 275 sb->s_magic = NFS_SUPER_MAGIC; 276 277 root_inode = nfs_get_root(sb, &server->fh, &fsinfo); 278 /* Did getting the root inode fail? */ 279 if (IS_ERR(root_inode)) { 280 no_root_error = PTR_ERR(root_inode); 281 goto out_no_root; 282 } 283 sb->s_root = d_alloc_root(root_inode); 284 if (!sb->s_root) { 285 no_root_error = -ENOMEM; 286 goto out_no_root; 287 } 288 sb->s_root->d_op = server->rpc_ops->dentry_ops; 289 290 /* Get some general file system info */ 291 if (server->namelen == 0 && 292 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0) 293 server->namelen = pathinfo.max_namelen; 294 /* Work out a lot of parameters */ 295 if (server->rsize == 0) 296 server->rsize = nfs_block_size(fsinfo.rtpref, NULL); 297 if (server->wsize == 0) 298 server->wsize = nfs_block_size(fsinfo.wtpref, NULL); 299 300 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax) 301 server->rsize = nfs_block_size(fsinfo.rtmax, NULL); 302 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax) 303 server->wsize = nfs_block_size(fsinfo.wtmax, NULL); 304 305 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 306 if (server->rsize > max_rpc_payload) 307 server->rsize = max_rpc_payload; 308 if (server->wsize > max_rpc_payload) 309 server->wsize = max_rpc_payload; 310 311 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 312 if (server->rpages > NFS_READ_MAXIOV) { 313 server->rpages = NFS_READ_MAXIOV; 314 server->rsize = server->rpages << PAGE_CACHE_SHIFT; 315 } 316 317 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 318 if (server->wpages > NFS_WRITE_MAXIOV) { 319 server->wpages = NFS_WRITE_MAXIOV; 320 server->wsize = server->wpages << PAGE_CACHE_SHIFT; 321 } 322 323 if (sb->s_blocksize == 0) 324 sb->s_blocksize = nfs_block_bits(server->wsize, 325 &sb->s_blocksize_bits); 326 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL); 327 328 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL); 329 if (server->dtsize > PAGE_CACHE_SIZE) 330 server->dtsize = PAGE_CACHE_SIZE; 331 if (server->dtsize > server->rsize) 332 server->dtsize = server->rsize; 333 334 if (server->flags & NFS_MOUNT_NOAC) { 335 server->acregmin = server->acregmax = 0; 336 server->acdirmin = server->acdirmax = 0; 337 sb->s_flags |= MS_SYNCHRONOUS; 338 } 339 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 340 341 sb->s_maxbytes = fsinfo.maxfilesize; 342 if (sb->s_maxbytes > MAX_LFS_FILESIZE) 343 sb->s_maxbytes = MAX_LFS_FILESIZE; 344 345 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; 346 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; 347 348 /* We're airborne Set socket buffersize */ 349 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 350 return 0; 351 /* Yargs. It didn't work out. */ 352 out_no_root: 353 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error); 354 if (!IS_ERR(root_inode)) 355 iput(root_inode); 356 return no_root_error; 357 } 358 359 /* 360 * Create an RPC client handle. 361 */ 362 static struct rpc_clnt * 363 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) 364 { 365 struct rpc_timeout timeparms; 366 struct rpc_xprt *xprt = NULL; 367 struct rpc_clnt *clnt = NULL; 368 int tcp = (data->flags & NFS_MOUNT_TCP); 369 370 /* Initialize timeout values */ 371 timeparms.to_initval = data->timeo * HZ / 10; 372 timeparms.to_retries = data->retrans; 373 timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT; 374 timeparms.to_exponential = 1; 375 376 if (!timeparms.to_initval) 377 timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10; 378 if (!timeparms.to_retries) 379 timeparms.to_retries = 5; 380 381 /* create transport and client */ 382 xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP, 383 &server->addr, &timeparms); 384 if (IS_ERR(xprt)) { 385 dprintk("%s: cannot create RPC transport. Error = %ld\n", 386 __FUNCTION__, PTR_ERR(xprt)); 387 return (struct rpc_clnt *)xprt; 388 } 389 clnt = rpc_create_client(xprt, server->hostname, &nfs_program, 390 server->rpc_ops->version, data->pseudoflavor); 391 if (IS_ERR(clnt)) { 392 dprintk("%s: cannot create RPC client. Error = %ld\n", 393 __FUNCTION__, PTR_ERR(xprt)); 394 goto out_fail; 395 } 396 397 clnt->cl_intr = 1; 398 clnt->cl_softrtry = 1; 399 clnt->cl_chatty = 1; 400 401 return clnt; 402 403 out_fail: 404 return clnt; 405 } 406 407 /* 408 * The way this works is that the mount process passes a structure 409 * in the data argument which contains the server's IP address 410 * and the root file handle obtained from the server's mount 411 * daemon. We stash these away in the private superblock fields. 412 */ 413 static int 414 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) 415 { 416 struct nfs_server *server; 417 rpc_authflavor_t authflavor; 418 419 server = NFS_SB(sb); 420 sb->s_blocksize_bits = 0; 421 sb->s_blocksize = 0; 422 if (data->bsize) 423 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); 424 if (data->rsize) 425 server->rsize = nfs_block_size(data->rsize, NULL); 426 if (data->wsize) 427 server->wsize = nfs_block_size(data->wsize, NULL); 428 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 429 430 server->acregmin = data->acregmin*HZ; 431 server->acregmax = data->acregmax*HZ; 432 server->acdirmin = data->acdirmin*HZ; 433 server->acdirmax = data->acdirmax*HZ; 434 435 /* Start lockd here, before we might error out */ 436 if (!(server->flags & NFS_MOUNT_NONLM)) 437 lockd_up(); 438 439 server->namelen = data->namlen; 440 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL); 441 if (!server->hostname) 442 return -ENOMEM; 443 strcpy(server->hostname, data->hostname); 444 445 /* Check NFS protocol revision and initialize RPC op vector 446 * and file handle pool. */ 447 #ifdef CONFIG_NFS_V3 448 if (server->flags & NFS_MOUNT_VER3) { 449 server->rpc_ops = &nfs_v3_clientops; 450 server->caps |= NFS_CAP_READDIRPLUS; 451 } else { 452 server->rpc_ops = &nfs_v2_clientops; 453 } 454 #else 455 server->rpc_ops = &nfs_v2_clientops; 456 #endif 457 458 /* Fill in pseudoflavor for mount version < 5 */ 459 if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) 460 data->pseudoflavor = RPC_AUTH_UNIX; 461 authflavor = data->pseudoflavor; /* save for sb_init() */ 462 /* XXX maybe we want to add a server->pseudoflavor field */ 463 464 /* Create RPC client handles */ 465 server->client = nfs_create_client(server, data); 466 if (IS_ERR(server->client)) 467 return PTR_ERR(server->client); 468 /* RFC 2623, sec 2.3.2 */ 469 if (authflavor != RPC_AUTH_UNIX) { 470 struct rpc_auth *auth; 471 472 server->client_sys = rpc_clone_client(server->client); 473 if (IS_ERR(server->client_sys)) 474 return PTR_ERR(server->client_sys); 475 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys); 476 if (IS_ERR(auth)) 477 return PTR_ERR(auth); 478 } else { 479 atomic_inc(&server->client->cl_count); 480 server->client_sys = server->client; 481 } 482 if (server->flags & NFS_MOUNT_VER3) { 483 #ifdef CONFIG_NFS_V3_ACL 484 if (!(server->flags & NFS_MOUNT_NOACL)) { 485 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 486 /* No errors! Assume that Sun nfsacls are supported */ 487 if (!IS_ERR(server->client_acl)) 488 server->caps |= NFS_CAP_ACLS; 489 } 490 #else 491 server->flags &= ~NFS_MOUNT_NOACL; 492 #endif /* CONFIG_NFS_V3_ACL */ 493 /* 494 * The VFS shouldn't apply the umask to mode bits. We will 495 * do so ourselves when necessary. 496 */ 497 sb->s_flags |= MS_POSIXACL; 498 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 499 server->namelen = NFS3_MAXNAMLEN; 500 sb->s_time_gran = 1; 501 } else { 502 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 503 server->namelen = NFS2_MAXNAMLEN; 504 } 505 506 sb->s_op = &nfs_sops; 507 return nfs_sb_init(sb, authflavor); 508 } 509 510 static int 511 nfs_statfs(struct super_block *sb, struct kstatfs *buf) 512 { 513 struct nfs_server *server = NFS_SB(sb); 514 unsigned char blockbits; 515 unsigned long blockres; 516 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode); 517 struct nfs_fattr fattr; 518 struct nfs_fsstat res = { 519 .fattr = &fattr, 520 }; 521 int error; 522 523 lock_kernel(); 524 525 error = server->rpc_ops->statfs(server, rootfh, &res); 526 buf->f_type = NFS_SUPER_MAGIC; 527 if (error < 0) 528 goto out_err; 529 530 /* 531 * Current versions of glibc do not correctly handle the 532 * case where f_frsize != f_bsize. Eventually we want to 533 * report the value of wtmult in this field. 534 */ 535 buf->f_frsize = sb->s_blocksize; 536 537 /* 538 * On most *nix systems, f_blocks, f_bfree, and f_bavail 539 * are reported in units of f_frsize. Linux hasn't had 540 * an f_frsize field in its statfs struct until recently, 541 * thus historically Linux's sys_statfs reports these 542 * fields in units of f_bsize. 543 */ 544 buf->f_bsize = sb->s_blocksize; 545 blockbits = sb->s_blocksize_bits; 546 blockres = (1 << blockbits) - 1; 547 buf->f_blocks = (res.tbytes + blockres) >> blockbits; 548 buf->f_bfree = (res.fbytes + blockres) >> blockbits; 549 buf->f_bavail = (res.abytes + blockres) >> blockbits; 550 551 buf->f_files = res.tfiles; 552 buf->f_ffree = res.afiles; 553 554 buf->f_namelen = server->namelen; 555 out: 556 unlock_kernel(); 557 558 return 0; 559 560 out_err: 561 printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error); 562 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; 563 goto out; 564 565 } 566 567 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) 568 { 569 static struct proc_nfs_info { 570 int flag; 571 char *str; 572 char *nostr; 573 } nfs_info[] = { 574 { NFS_MOUNT_SOFT, ",soft", ",hard" }, 575 { NFS_MOUNT_INTR, ",intr", "" }, 576 { NFS_MOUNT_POSIX, ",posix", "" }, 577 { NFS_MOUNT_TCP, ",tcp", ",udp" }, 578 { NFS_MOUNT_NOCTO, ",nocto", "" }, 579 { NFS_MOUNT_NOAC, ",noac", "" }, 580 { NFS_MOUNT_NONLM, ",nolock", ",lock" }, 581 { NFS_MOUNT_NOACL, ",noacl", "" }, 582 { 0, NULL, NULL } 583 }; 584 struct proc_nfs_info *nfs_infop; 585 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); 586 587 seq_printf(m, ",v%d", nfss->rpc_ops->version); 588 seq_printf(m, ",rsize=%d", nfss->rsize); 589 seq_printf(m, ",wsize=%d", nfss->wsize); 590 if (nfss->acregmin != 3*HZ) 591 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); 592 if (nfss->acregmax != 60*HZ) 593 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); 594 if (nfss->acdirmin != 30*HZ) 595 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); 596 if (nfss->acdirmax != 60*HZ) 597 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); 598 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { 599 if (nfss->flags & nfs_infop->flag) 600 seq_puts(m, nfs_infop->str); 601 else 602 seq_puts(m, nfs_infop->nostr); 603 } 604 seq_puts(m, ",addr="); 605 seq_escape(m, nfss->hostname, " \t\n\\"); 606 return 0; 607 } 608 609 /* 610 * Invalidate the local caches 611 */ 612 void 613 nfs_zap_caches(struct inode *inode) 614 { 615 struct nfs_inode *nfsi = NFS_I(inode); 616 int mode = inode->i_mode; 617 618 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); 619 NFS_ATTRTIMEO_UPDATE(inode) = jiffies; 620 621 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); 622 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) 623 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 624 else 625 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; 626 } 627 628 static void nfs_zap_acl_cache(struct inode *inode) 629 { 630 void (*clear_acl_cache)(struct inode *); 631 632 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; 633 if (clear_acl_cache != NULL) 634 clear_acl_cache(inode); 635 NFS_I(inode)->flags &= ~NFS_INO_INVALID_ACL; 636 } 637 638 /* 639 * Invalidate, but do not unhash, the inode 640 */ 641 static void 642 nfs_invalidate_inode(struct inode *inode) 643 { 644 umode_t save_mode = inode->i_mode; 645 646 make_bad_inode(inode); 647 inode->i_mode = save_mode; 648 nfs_zap_caches(inode); 649 } 650 651 struct nfs_find_desc { 652 struct nfs_fh *fh; 653 struct nfs_fattr *fattr; 654 }; 655 656 /* 657 * In NFSv3 we can have 64bit inode numbers. In order to support 658 * this, and re-exported directories (also seen in NFSv2) 659 * we are forced to allow 2 different inodes to have the same 660 * i_ino. 661 */ 662 static int 663 nfs_find_actor(struct inode *inode, void *opaque) 664 { 665 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 666 struct nfs_fh *fh = desc->fh; 667 struct nfs_fattr *fattr = desc->fattr; 668 669 if (NFS_FILEID(inode) != fattr->fileid) 670 return 0; 671 if (nfs_compare_fh(NFS_FH(inode), fh)) 672 return 0; 673 if (is_bad_inode(inode) || NFS_STALE(inode)) 674 return 0; 675 return 1; 676 } 677 678 static int 679 nfs_init_locked(struct inode *inode, void *opaque) 680 { 681 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; 682 struct nfs_fattr *fattr = desc->fattr; 683 684 NFS_FILEID(inode) = fattr->fileid; 685 nfs_copy_fh(NFS_FH(inode), desc->fh); 686 return 0; 687 } 688 689 /* Don't use READDIRPLUS on directories that we believe are too large */ 690 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) 691 692 /* 693 * This is our front-end to iget that looks up inodes by file handle 694 * instead of inode number. 695 */ 696 struct inode * 697 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) 698 { 699 struct nfs_find_desc desc = { 700 .fh = fh, 701 .fattr = fattr 702 }; 703 struct inode *inode = NULL; 704 unsigned long hash; 705 706 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 707 goto out_no_inode; 708 709 if (!fattr->nlink) { 710 printk("NFS: Buggy server - nlink == 0!\n"); 711 goto out_no_inode; 712 } 713 714 hash = nfs_fattr_to_ino_t(fattr); 715 716 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc))) 717 goto out_no_inode; 718 719 if (inode->i_state & I_NEW) { 720 struct nfs_inode *nfsi = NFS_I(inode); 721 722 /* We set i_ino for the few things that still rely on it, 723 * such as stat(2) */ 724 inode->i_ino = hash; 725 726 /* We can't support update_atime(), since the server will reset it */ 727 inode->i_flags |= S_NOATIME|S_NOCMTIME; 728 inode->i_mode = fattr->mode; 729 /* Why so? Because we want revalidate for devices/FIFOs, and 730 * that's precisely what we have in nfs_file_inode_operations. 731 */ 732 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops; 733 if (S_ISREG(inode->i_mode)) { 734 inode->i_fop = &nfs_file_operations; 735 inode->i_data.a_ops = &nfs_file_aops; 736 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; 737 } else if (S_ISDIR(inode->i_mode)) { 738 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops; 739 inode->i_fop = &nfs_dir_operations; 740 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) 741 && fattr->size <= NFS_LIMIT_READDIRPLUS) 742 NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS; 743 } else if (S_ISLNK(inode->i_mode)) 744 inode->i_op = &nfs_symlink_inode_operations; 745 else 746 init_special_inode(inode, inode->i_mode, fattr->rdev); 747 748 nfsi->read_cache_jiffies = fattr->timestamp; 749 inode->i_atime = fattr->atime; 750 inode->i_mtime = fattr->mtime; 751 inode->i_ctime = fattr->ctime; 752 if (fattr->valid & NFS_ATTR_FATTR_V4) 753 nfsi->change_attr = fattr->change_attr; 754 inode->i_size = nfs_size_to_loff_t(fattr->size); 755 inode->i_nlink = fattr->nlink; 756 inode->i_uid = fattr->uid; 757 inode->i_gid = fattr->gid; 758 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 759 /* 760 * report the blocks in 512byte units 761 */ 762 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 763 inode->i_blksize = inode->i_sb->s_blocksize; 764 } else { 765 inode->i_blocks = fattr->du.nfs2.blocks; 766 inode->i_blksize = fattr->du.nfs2.blocksize; 767 } 768 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 769 nfsi->attrtimeo_timestamp = jiffies; 770 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 771 nfsi->cache_access.cred = NULL; 772 773 unlock_new_inode(inode); 774 } else 775 nfs_refresh_inode(inode, fattr); 776 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", 777 inode->i_sb->s_id, 778 (long long)NFS_FILEID(inode), 779 atomic_read(&inode->i_count)); 780 781 out: 782 return inode; 783 784 out_no_inode: 785 printk("nfs_fhget: iget failed\n"); 786 goto out; 787 } 788 789 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) 790 791 int 792 nfs_setattr(struct dentry *dentry, struct iattr *attr) 793 { 794 struct inode *inode = dentry->d_inode; 795 struct nfs_fattr fattr; 796 int error; 797 798 if (attr->ia_valid & ATTR_SIZE) { 799 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) 800 attr->ia_valid &= ~ATTR_SIZE; 801 } 802 803 /* Optimization: if the end result is no change, don't RPC */ 804 attr->ia_valid &= NFS_VALID_ATTRS; 805 if (attr->ia_valid == 0) 806 return 0; 807 808 lock_kernel(); 809 nfs_begin_data_update(inode); 810 /* Write all dirty data if we're changing file permissions or size */ 811 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) { 812 if (filemap_fdatawrite(inode->i_mapping) == 0) 813 filemap_fdatawait(inode->i_mapping); 814 nfs_wb_all(inode); 815 } 816 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); 817 if (error == 0) { 818 nfs_refresh_inode(inode, &fattr); 819 if ((attr->ia_valid & ATTR_MODE) != 0) { 820 int mode; 821 mode = inode->i_mode & ~S_IALLUGO; 822 mode |= attr->ia_mode & S_IALLUGO; 823 inode->i_mode = mode; 824 } 825 if ((attr->ia_valid & ATTR_UID) != 0) 826 inode->i_uid = attr->ia_uid; 827 if ((attr->ia_valid & ATTR_GID) != 0) 828 inode->i_gid = attr->ia_gid; 829 if ((attr->ia_valid & ATTR_SIZE) != 0) { 830 inode->i_size = attr->ia_size; 831 vmtruncate(inode, attr->ia_size); 832 } 833 } 834 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 835 NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 836 nfs_end_data_update(inode); 837 unlock_kernel(); 838 return error; 839 } 840 841 /* 842 * Wait for the inode to get unlocked. 843 * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING). 844 */ 845 static int 846 nfs_wait_on_inode(struct inode *inode, int flag) 847 { 848 struct rpc_clnt *clnt = NFS_CLIENT(inode); 849 struct nfs_inode *nfsi = NFS_I(inode); 850 851 int error; 852 if (!(NFS_FLAGS(inode) & flag)) 853 return 0; 854 atomic_inc(&inode->i_count); 855 error = nfs_wait_event(clnt, nfsi->nfs_i_wait, 856 !(NFS_FLAGS(inode) & flag)); 857 iput(inode); 858 return error; 859 } 860 861 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 862 { 863 struct inode *inode = dentry->d_inode; 864 struct nfs_inode *nfsi = NFS_I(inode); 865 int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME; 866 int err; 867 868 if (__IS_FLG(inode, MS_NOATIME)) 869 need_atime = 0; 870 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode)) 871 need_atime = 0; 872 /* We may force a getattr if the user cares about atime */ 873 if (need_atime) 874 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 875 else 876 err = nfs_revalidate_inode(NFS_SERVER(inode), inode); 877 if (!err) 878 generic_fillattr(inode, stat); 879 return err; 880 } 881 882 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred) 883 { 884 struct nfs_open_context *ctx; 885 886 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL); 887 if (ctx != NULL) { 888 atomic_set(&ctx->count, 1); 889 ctx->dentry = dget(dentry); 890 ctx->cred = get_rpccred(cred); 891 ctx->state = NULL; 892 ctx->lockowner = current->files; 893 ctx->error = 0; 894 ctx->dir_cookie = 0; 895 } 896 return ctx; 897 } 898 899 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) 900 { 901 if (ctx != NULL) 902 atomic_inc(&ctx->count); 903 return ctx; 904 } 905 906 void put_nfs_open_context(struct nfs_open_context *ctx) 907 { 908 if (atomic_dec_and_test(&ctx->count)) { 909 if (!list_empty(&ctx->list)) { 910 struct inode *inode = ctx->dentry->d_inode; 911 spin_lock(&inode->i_lock); 912 list_del(&ctx->list); 913 spin_unlock(&inode->i_lock); 914 } 915 if (ctx->state != NULL) 916 nfs4_close_state(ctx->state, ctx->mode); 917 if (ctx->cred != NULL) 918 put_rpccred(ctx->cred); 919 dput(ctx->dentry); 920 kfree(ctx); 921 } 922 } 923 924 /* 925 * Ensure that mmap has a recent RPC credential for use when writing out 926 * shared pages 927 */ 928 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) 929 { 930 struct inode *inode = filp->f_dentry->d_inode; 931 struct nfs_inode *nfsi = NFS_I(inode); 932 933 filp->private_data = get_nfs_open_context(ctx); 934 spin_lock(&inode->i_lock); 935 list_add(&ctx->list, &nfsi->open_files); 936 spin_unlock(&inode->i_lock); 937 } 938 939 struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode) 940 { 941 struct nfs_inode *nfsi = NFS_I(inode); 942 struct nfs_open_context *pos, *ctx = NULL; 943 944 spin_lock(&inode->i_lock); 945 list_for_each_entry(pos, &nfsi->open_files, list) { 946 if ((pos->mode & mode) == mode) { 947 ctx = get_nfs_open_context(pos); 948 break; 949 } 950 } 951 spin_unlock(&inode->i_lock); 952 return ctx; 953 } 954 955 void nfs_file_clear_open_context(struct file *filp) 956 { 957 struct inode *inode = filp->f_dentry->d_inode; 958 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data; 959 960 if (ctx) { 961 filp->private_data = NULL; 962 spin_lock(&inode->i_lock); 963 list_move_tail(&ctx->list, &NFS_I(inode)->open_files); 964 spin_unlock(&inode->i_lock); 965 put_nfs_open_context(ctx); 966 } 967 } 968 969 /* 970 * These allocate and release file read/write context information. 971 */ 972 int nfs_open(struct inode *inode, struct file *filp) 973 { 974 struct nfs_open_context *ctx; 975 struct rpc_cred *cred; 976 977 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); 978 if (IS_ERR(cred)) 979 return PTR_ERR(cred); 980 ctx = alloc_nfs_open_context(filp->f_dentry, cred); 981 put_rpccred(cred); 982 if (ctx == NULL) 983 return -ENOMEM; 984 ctx->mode = filp->f_mode; 985 nfs_file_set_open_context(filp, ctx); 986 put_nfs_open_context(ctx); 987 if ((filp->f_mode & FMODE_WRITE) != 0) 988 nfs_begin_data_update(inode); 989 return 0; 990 } 991 992 int nfs_release(struct inode *inode, struct file *filp) 993 { 994 if ((filp->f_mode & FMODE_WRITE) != 0) 995 nfs_end_data_update(inode); 996 nfs_file_clear_open_context(filp); 997 return 0; 998 } 999 1000 /* 1001 * This function is called whenever some part of NFS notices that 1002 * the cached attributes have to be refreshed. 1003 */ 1004 int 1005 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1006 { 1007 int status = -ESTALE; 1008 struct nfs_fattr fattr; 1009 struct nfs_inode *nfsi = NFS_I(inode); 1010 unsigned long verifier; 1011 unsigned int flags; 1012 1013 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", 1014 inode->i_sb->s_id, (long long)NFS_FILEID(inode)); 1015 1016 lock_kernel(); 1017 if (!inode || is_bad_inode(inode)) 1018 goto out_nowait; 1019 if (NFS_STALE(inode)) 1020 goto out_nowait; 1021 1022 while (NFS_REVALIDATING(inode)) { 1023 status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING); 1024 if (status < 0) 1025 goto out_nowait; 1026 if (NFS_ATTRTIMEO(inode) == 0) 1027 continue; 1028 if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) 1029 continue; 1030 status = NFS_STALE(inode) ? -ESTALE : 0; 1031 goto out_nowait; 1032 } 1033 NFS_FLAGS(inode) |= NFS_INO_REVALIDATING; 1034 1035 /* Protect against RPC races by saving the change attribute */ 1036 verifier = nfs_save_change_attribute(inode); 1037 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); 1038 if (status != 0) { 1039 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", 1040 inode->i_sb->s_id, 1041 (long long)NFS_FILEID(inode), status); 1042 if (status == -ESTALE) { 1043 nfs_zap_caches(inode); 1044 if (!S_ISDIR(inode->i_mode)) 1045 NFS_FLAGS(inode) |= NFS_INO_STALE; 1046 } 1047 goto out; 1048 } 1049 1050 status = nfs_update_inode(inode, &fattr, verifier); 1051 if (status) { 1052 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", 1053 inode->i_sb->s_id, 1054 (long long)NFS_FILEID(inode), status); 1055 goto out; 1056 } 1057 flags = nfsi->flags; 1058 nfsi->flags &= ~NFS_INO_REVAL_PAGECACHE; 1059 /* 1060 * We may need to keep the attributes marked as invalid if 1061 * we raced with nfs_end_attr_update(). 1062 */ 1063 if (verifier == nfsi->cache_change_attribute) 1064 nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME); 1065 /* Do the page cache invalidation */ 1066 nfs_revalidate_mapping(inode, inode->i_mapping); 1067 if (flags & NFS_INO_INVALID_ACL) 1068 nfs_zap_acl_cache(inode); 1069 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", 1070 inode->i_sb->s_id, 1071 (long long)NFS_FILEID(inode)); 1072 1073 out: 1074 NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING; 1075 wake_up(&nfsi->nfs_i_wait); 1076 out_nowait: 1077 unlock_kernel(); 1078 return status; 1079 } 1080 1081 int nfs_attribute_timeout(struct inode *inode) 1082 { 1083 struct nfs_inode *nfsi = NFS_I(inode); 1084 1085 if (nfs_have_delegation(inode, FMODE_READ)) 1086 return 0; 1087 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo); 1088 } 1089 1090 /** 1091 * nfs_revalidate_inode - Revalidate the inode attributes 1092 * @server - pointer to nfs_server struct 1093 * @inode - pointer to inode struct 1094 * 1095 * Updates inode attribute information by retrieving the data from the server. 1096 */ 1097 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) 1098 { 1099 if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) 1100 && !nfs_attribute_timeout(inode)) 1101 return NFS_STALE(inode) ? -ESTALE : 0; 1102 return __nfs_revalidate_inode(server, inode); 1103 } 1104 1105 /** 1106 * nfs_revalidate_mapping - Revalidate the pagecache 1107 * @inode - pointer to host inode 1108 * @mapping - pointer to mapping 1109 */ 1110 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) 1111 { 1112 struct nfs_inode *nfsi = NFS_I(inode); 1113 1114 if (nfsi->flags & NFS_INO_INVALID_DATA) { 1115 if (S_ISREG(inode->i_mode)) { 1116 if (filemap_fdatawrite(mapping) == 0) 1117 filemap_fdatawait(mapping); 1118 nfs_wb_all(inode); 1119 } 1120 invalidate_inode_pages2(mapping); 1121 nfsi->flags &= ~NFS_INO_INVALID_DATA; 1122 if (S_ISDIR(inode->i_mode)) { 1123 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); 1124 /* This ensures we revalidate child dentries */ 1125 nfsi->cache_change_attribute++; 1126 } 1127 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", 1128 inode->i_sb->s_id, 1129 (long long)NFS_FILEID(inode)); 1130 } 1131 } 1132 1133 /** 1134 * nfs_begin_data_update 1135 * @inode - pointer to inode 1136 * Declare that a set of operations will update file data on the server 1137 */ 1138 void nfs_begin_data_update(struct inode *inode) 1139 { 1140 atomic_inc(&NFS_I(inode)->data_updates); 1141 } 1142 1143 /** 1144 * nfs_end_data_update 1145 * @inode - pointer to inode 1146 * Declare end of the operations that will update file data 1147 * This will mark the inode as immediately needing revalidation 1148 * of its attribute cache. 1149 */ 1150 void nfs_end_data_update(struct inode *inode) 1151 { 1152 struct nfs_inode *nfsi = NFS_I(inode); 1153 1154 if (!nfs_have_delegation(inode, FMODE_READ)) { 1155 /* Mark the attribute cache for revalidation */ 1156 nfsi->flags |= NFS_INO_INVALID_ATTR; 1157 /* Directories and symlinks: invalidate page cache too */ 1158 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) 1159 nfsi->flags |= NFS_INO_INVALID_DATA; 1160 } 1161 nfsi->cache_change_attribute ++; 1162 atomic_dec(&nfsi->data_updates); 1163 } 1164 1165 /** 1166 * nfs_refresh_inode - verify consistency of the inode attribute cache 1167 * @inode - pointer to inode 1168 * @fattr - updated attributes 1169 * 1170 * Verifies the attribute cache. If we have just changed the attributes, 1171 * so that fattr carries weak cache consistency data, then it may 1172 * also update the ctime/mtime/change_attribute. 1173 */ 1174 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) 1175 { 1176 struct nfs_inode *nfsi = NFS_I(inode); 1177 loff_t cur_size, new_isize; 1178 int data_unstable; 1179 1180 /* Do we hold a delegation? */ 1181 if (nfs_have_delegation(inode, FMODE_READ)) 1182 return 0; 1183 1184 /* Are we in the process of updating data on the server? */ 1185 data_unstable = nfs_caches_unstable(inode); 1186 1187 if (fattr->valid & NFS_ATTR_FATTR_V4) { 1188 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0 1189 && nfsi->change_attr == fattr->pre_change_attr) 1190 nfsi->change_attr = fattr->change_attr; 1191 if (nfsi->change_attr != fattr->change_attr) { 1192 nfsi->flags |= NFS_INO_INVALID_ATTR; 1193 if (!data_unstable) 1194 nfsi->flags |= NFS_INO_REVAL_PAGECACHE; 1195 } 1196 } 1197 1198 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1199 return 0; 1200 1201 /* Has the inode gone and changed behind our back? */ 1202 if (nfsi->fileid != fattr->fileid 1203 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1204 return -EIO; 1205 1206 cur_size = i_size_read(inode); 1207 new_isize = nfs_size_to_loff_t(fattr->size); 1208 1209 /* If we have atomic WCC data, we may update some attributes */ 1210 if ((fattr->valid & NFS_ATTR_WCC) != 0) { 1211 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) 1212 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1213 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) 1214 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1215 } 1216 1217 /* Verify a few of the more important attributes */ 1218 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 1219 nfsi->flags |= NFS_INO_INVALID_ATTR; 1220 if (!data_unstable) 1221 nfsi->flags |= NFS_INO_REVAL_PAGECACHE; 1222 } 1223 if (cur_size != new_isize) { 1224 nfsi->flags |= NFS_INO_INVALID_ATTR; 1225 if (nfsi->npages == 0) 1226 nfsi->flags |= NFS_INO_REVAL_PAGECACHE; 1227 } 1228 1229 /* Have any file permissions changed? */ 1230 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) 1231 || inode->i_uid != fattr->uid 1232 || inode->i_gid != fattr->gid) 1233 nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; 1234 1235 /* Has the link count changed? */ 1236 if (inode->i_nlink != fattr->nlink) 1237 nfsi->flags |= NFS_INO_INVALID_ATTR; 1238 1239 if (!timespec_equal(&inode->i_atime, &fattr->atime)) 1240 nfsi->flags |= NFS_INO_INVALID_ATIME; 1241 1242 nfsi->read_cache_jiffies = fattr->timestamp; 1243 return 0; 1244 } 1245 1246 /* 1247 * Many nfs protocol calls return the new file attributes after 1248 * an operation. Here we update the inode to reflect the state 1249 * of the server's inode. 1250 * 1251 * This is a bit tricky because we have to make sure all dirty pages 1252 * have been sent off to the server before calling invalidate_inode_pages. 1253 * To make sure no other process adds more write requests while we try 1254 * our best to flush them, we make them sleep during the attribute refresh. 1255 * 1256 * A very similar scenario holds for the dir cache. 1257 */ 1258 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier) 1259 { 1260 struct nfs_inode *nfsi = NFS_I(inode); 1261 loff_t cur_isize, new_isize; 1262 unsigned int invalid = 0; 1263 int data_unstable; 1264 1265 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", 1266 __FUNCTION__, inode->i_sb->s_id, inode->i_ino, 1267 atomic_read(&inode->i_count), fattr->valid); 1268 1269 if ((fattr->valid & NFS_ATTR_FATTR) == 0) 1270 return 0; 1271 1272 if (nfsi->fileid != fattr->fileid) { 1273 printk(KERN_ERR "%s: inode number mismatch\n" 1274 "expected (%s/0x%Lx), got (%s/0x%Lx)\n", 1275 __FUNCTION__, 1276 inode->i_sb->s_id, (long long)nfsi->fileid, 1277 inode->i_sb->s_id, (long long)fattr->fileid); 1278 goto out_err; 1279 } 1280 1281 /* 1282 * Make sure the inode's type hasn't changed. 1283 */ 1284 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) 1285 goto out_changed; 1286 1287 /* 1288 * Update the read time so we don't revalidate too often. 1289 */ 1290 nfsi->read_cache_jiffies = fattr->timestamp; 1291 1292 /* Are we racing with known updates of the metadata on the server? */ 1293 data_unstable = ! nfs_verify_change_attribute(inode, verifier); 1294 1295 /* Check if our cached file size is stale */ 1296 new_isize = nfs_size_to_loff_t(fattr->size); 1297 cur_isize = i_size_read(inode); 1298 if (new_isize != cur_isize) { 1299 /* Do we perhaps have any outstanding writes? */ 1300 if (nfsi->npages == 0) { 1301 /* No, but did we race with nfs_end_data_update()? */ 1302 if (verifier == nfsi->cache_change_attribute) { 1303 inode->i_size = new_isize; 1304 invalid |= NFS_INO_INVALID_DATA; 1305 } 1306 invalid |= NFS_INO_INVALID_ATTR; 1307 } else if (new_isize > cur_isize) { 1308 inode->i_size = new_isize; 1309 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1310 } 1311 dprintk("NFS: isize change on server for file %s/%ld\n", 1312 inode->i_sb->s_id, inode->i_ino); 1313 } 1314 1315 /* Check if the mtime agrees */ 1316 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { 1317 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); 1318 dprintk("NFS: mtime change on server for file %s/%ld\n", 1319 inode->i_sb->s_id, inode->i_ino); 1320 if (!data_unstable) 1321 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; 1322 } 1323 1324 if ((fattr->valid & NFS_ATTR_FATTR_V4) 1325 && nfsi->change_attr != fattr->change_attr) { 1326 dprintk("NFS: change_attr change on server for file %s/%ld\n", 1327 inode->i_sb->s_id, inode->i_ino); 1328 nfsi->change_attr = fattr->change_attr; 1329 if (!data_unstable) 1330 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1331 } 1332 1333 /* If ctime has changed we should definitely clear access+acl caches */ 1334 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { 1335 if (!data_unstable) 1336 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1337 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 1338 } 1339 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); 1340 1341 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || 1342 inode->i_uid != fattr->uid || 1343 inode->i_gid != fattr->gid) 1344 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; 1345 1346 inode->i_mode = fattr->mode; 1347 inode->i_nlink = fattr->nlink; 1348 inode->i_uid = fattr->uid; 1349 inode->i_gid = fattr->gid; 1350 1351 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { 1352 /* 1353 * report the blocks in 512byte units 1354 */ 1355 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); 1356 inode->i_blksize = inode->i_sb->s_blocksize; 1357 } else { 1358 inode->i_blocks = fattr->du.nfs2.blocks; 1359 inode->i_blksize = fattr->du.nfs2.blocksize; 1360 } 1361 1362 /* Update attrtimeo value if we're out of the unstable period */ 1363 if (invalid & NFS_INO_INVALID_ATTR) { 1364 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1365 nfsi->attrtimeo_timestamp = jiffies; 1366 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) { 1367 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) 1368 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); 1369 nfsi->attrtimeo_timestamp = jiffies; 1370 } 1371 /* Don't invalidate the data if we were to blame */ 1372 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) 1373 || S_ISLNK(inode->i_mode))) 1374 invalid &= ~NFS_INO_INVALID_DATA; 1375 if (!nfs_have_delegation(inode, FMODE_READ)) 1376 nfsi->flags |= invalid; 1377 1378 return 0; 1379 out_changed: 1380 /* 1381 * Big trouble! The inode has become a different object. 1382 */ 1383 #ifdef NFS_PARANOIA 1384 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", 1385 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); 1386 #endif 1387 /* 1388 * No need to worry about unhashing the dentry, as the 1389 * lookup validation will know that the inode is bad. 1390 * (But we fall through to invalidate the caches.) 1391 */ 1392 nfs_invalidate_inode(inode); 1393 out_err: 1394 NFS_FLAGS(inode) |= NFS_INO_STALE; 1395 return -ESTALE; 1396 } 1397 1398 /* 1399 * File system information 1400 */ 1401 1402 static int nfs_set_super(struct super_block *s, void *data) 1403 { 1404 s->s_fs_info = data; 1405 return set_anon_super(s, data); 1406 } 1407 1408 static int nfs_compare_super(struct super_block *sb, void *data) 1409 { 1410 struct nfs_server *server = data; 1411 struct nfs_server *old = NFS_SB(sb); 1412 1413 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) 1414 return 0; 1415 if (old->addr.sin_port != server->addr.sin_port) 1416 return 0; 1417 return !nfs_compare_fh(&old->fh, &server->fh); 1418 } 1419 1420 static struct super_block *nfs_get_sb(struct file_system_type *fs_type, 1421 int flags, const char *dev_name, void *raw_data) 1422 { 1423 int error; 1424 struct nfs_server *server = NULL; 1425 struct super_block *s; 1426 struct nfs_fh *root; 1427 struct nfs_mount_data *data = raw_data; 1428 1429 s = ERR_PTR(-EINVAL); 1430 if (data == NULL) { 1431 dprintk("%s: missing data argument\n", __FUNCTION__); 1432 goto out_err; 1433 } 1434 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { 1435 dprintk("%s: bad mount version\n", __FUNCTION__); 1436 goto out_err; 1437 } 1438 switch (data->version) { 1439 case 1: 1440 data->namlen = 0; 1441 case 2: 1442 data->bsize = 0; 1443 case 3: 1444 if (data->flags & NFS_MOUNT_VER3) { 1445 dprintk("%s: mount structure version %d does not support NFSv3\n", 1446 __FUNCTION__, 1447 data->version); 1448 goto out_err; 1449 } 1450 data->root.size = NFS2_FHSIZE; 1451 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 1452 case 4: 1453 if (data->flags & NFS_MOUNT_SECFLAVOUR) { 1454 dprintk("%s: mount structure version %d does not support strong security\n", 1455 __FUNCTION__, 1456 data->version); 1457 goto out_err; 1458 } 1459 case 5: 1460 memset(data->context, 0, sizeof(data->context)); 1461 } 1462 #ifndef CONFIG_NFS_V3 1463 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ 1464 s = ERR_PTR(-EPROTONOSUPPORT); 1465 if (data->flags & NFS_MOUNT_VER3) { 1466 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); 1467 goto out_err; 1468 } 1469 #endif /* CONFIG_NFS_V3 */ 1470 1471 s = ERR_PTR(-ENOMEM); 1472 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); 1473 if (!server) 1474 goto out_err; 1475 memset(server, 0, sizeof(struct nfs_server)); 1476 /* Zero out the NFS state stuff */ 1477 init_nfsv4_state(server); 1478 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); 1479 1480 root = &server->fh; 1481 if (data->flags & NFS_MOUNT_VER3) 1482 root->size = data->root.size; 1483 else 1484 root->size = NFS2_FHSIZE; 1485 s = ERR_PTR(-EINVAL); 1486 if (root->size > sizeof(root->data)) { 1487 dprintk("%s: invalid root filehandle\n", __FUNCTION__); 1488 goto out_err; 1489 } 1490 memcpy(root->data, data->root.data, root->size); 1491 1492 /* We now require that the mount process passes the remote address */ 1493 memcpy(&server->addr, &data->addr, sizeof(server->addr)); 1494 if (server->addr.sin_addr.s_addr == INADDR_ANY) { 1495 dprintk("%s: mount program didn't pass remote address!\n", 1496 __FUNCTION__); 1497 goto out_err; 1498 } 1499 1500 /* Fire up rpciod if not yet running */ 1501 s = ERR_PTR(rpciod_up()); 1502 if (IS_ERR(s)) { 1503 dprintk("%s: couldn't start rpciod! Error = %ld\n", 1504 __FUNCTION__, PTR_ERR(s)); 1505 goto out_err; 1506 } 1507 1508 s = sget(fs_type, nfs_compare_super, nfs_set_super, server); 1509 if (IS_ERR(s) || s->s_root) 1510 goto out_rpciod_down; 1511 1512 s->s_flags = flags; 1513 1514 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); 1515 if (error) { 1516 up_write(&s->s_umount); 1517 deactivate_super(s); 1518 return ERR_PTR(error); 1519 } 1520 s->s_flags |= MS_ACTIVE; 1521 return s; 1522 out_rpciod_down: 1523 rpciod_down(); 1524 out_err: 1525 kfree(server); 1526 return s; 1527 } 1528 1529 static void nfs_kill_super(struct super_block *s) 1530 { 1531 struct nfs_server *server = NFS_SB(s); 1532 1533 kill_anon_super(s); 1534 1535 if (!IS_ERR(server->client)) 1536 rpc_shutdown_client(server->client); 1537 if (!IS_ERR(server->client_sys)) 1538 rpc_shutdown_client(server->client_sys); 1539 if (!IS_ERR(server->client_acl)) 1540 rpc_shutdown_client(server->client_acl); 1541 1542 if (!(server->flags & NFS_MOUNT_NONLM)) 1543 lockd_down(); /* release rpc.lockd */ 1544 1545 rpciod_down(); /* release rpciod */ 1546 1547 if (server->hostname != NULL) 1548 kfree(server->hostname); 1549 kfree(server); 1550 } 1551 1552 static struct file_system_type nfs_fs_type = { 1553 .owner = THIS_MODULE, 1554 .name = "nfs", 1555 .get_sb = nfs_get_sb, 1556 .kill_sb = nfs_kill_super, 1557 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 1558 }; 1559 1560 #ifdef CONFIG_NFS_V4 1561 1562 static void nfs4_clear_inode(struct inode *); 1563 1564 1565 static struct super_operations nfs4_sops = { 1566 .alloc_inode = nfs_alloc_inode, 1567 .destroy_inode = nfs_destroy_inode, 1568 .write_inode = nfs_write_inode, 1569 .delete_inode = nfs_delete_inode, 1570 .statfs = nfs_statfs, 1571 .clear_inode = nfs4_clear_inode, 1572 .umount_begin = nfs_umount_begin, 1573 .show_options = nfs_show_options, 1574 }; 1575 1576 /* 1577 * Clean out any remaining NFSv4 state that might be left over due 1578 * to open() calls that passed nfs_atomic_lookup, but failed to call 1579 * nfs_open(). 1580 */ 1581 static void nfs4_clear_inode(struct inode *inode) 1582 { 1583 struct nfs_inode *nfsi = NFS_I(inode); 1584 1585 /* If we are holding a delegation, return it! */ 1586 if (nfsi->delegation != NULL) 1587 nfs_inode_return_delegation(inode); 1588 /* First call standard NFS clear_inode() code */ 1589 nfs_clear_inode(inode); 1590 /* Now clear out any remaining state */ 1591 while (!list_empty(&nfsi->open_states)) { 1592 struct nfs4_state *state; 1593 1594 state = list_entry(nfsi->open_states.next, 1595 struct nfs4_state, 1596 inode_states); 1597 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n", 1598 __FUNCTION__, 1599 inode->i_sb->s_id, 1600 (long long)NFS_FILEID(inode), 1601 state); 1602 BUG_ON(atomic_read(&state->count) != 1); 1603 nfs4_close_state(state, state->state); 1604 } 1605 } 1606 1607 1608 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) 1609 { 1610 struct nfs_server *server; 1611 struct nfs4_client *clp = NULL; 1612 struct rpc_xprt *xprt = NULL; 1613 struct rpc_clnt *clnt = NULL; 1614 struct rpc_timeout timeparms; 1615 rpc_authflavor_t authflavour; 1616 int proto, err = -EIO; 1617 1618 sb->s_blocksize_bits = 0; 1619 sb->s_blocksize = 0; 1620 server = NFS_SB(sb); 1621 if (data->rsize != 0) 1622 server->rsize = nfs_block_size(data->rsize, NULL); 1623 if (data->wsize != 0) 1624 server->wsize = nfs_block_size(data->wsize, NULL); 1625 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 1626 server->caps = NFS_CAP_ATOMIC_OPEN; 1627 1628 server->acregmin = data->acregmin*HZ; 1629 server->acregmax = data->acregmax*HZ; 1630 server->acdirmin = data->acdirmin*HZ; 1631 server->acdirmax = data->acdirmax*HZ; 1632 1633 server->rpc_ops = &nfs_v4_clientops; 1634 /* Initialize timeout values */ 1635 1636 timeparms.to_initval = data->timeo * HZ / 10; 1637 timeparms.to_retries = data->retrans; 1638 timeparms.to_exponential = 1; 1639 if (!timeparms.to_retries) 1640 timeparms.to_retries = 5; 1641 1642 proto = data->proto; 1643 /* Which IP protocol do we use? */ 1644 switch (proto) { 1645 case IPPROTO_TCP: 1646 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT; 1647 if (!timeparms.to_initval) 1648 timeparms.to_initval = 600 * HZ / 10; 1649 break; 1650 case IPPROTO_UDP: 1651 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT; 1652 if (!timeparms.to_initval) 1653 timeparms.to_initval = 11 * HZ / 10; 1654 break; 1655 default: 1656 return -EINVAL; 1657 } 1658 1659 clp = nfs4_get_client(&server->addr.sin_addr); 1660 if (!clp) { 1661 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); 1662 return -EIO; 1663 } 1664 1665 /* Now create transport and client */ 1666 authflavour = RPC_AUTH_UNIX; 1667 if (data->auth_flavourlen != 0) { 1668 if (data->auth_flavourlen != 1) { 1669 dprintk("%s: Invalid number of RPC auth flavours %d.\n", 1670 __FUNCTION__, data->auth_flavourlen); 1671 err = -EINVAL; 1672 goto out_fail; 1673 } 1674 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { 1675 err = -EFAULT; 1676 goto out_fail; 1677 } 1678 } 1679 1680 down_write(&clp->cl_sem); 1681 if (IS_ERR(clp->cl_rpcclient)) { 1682 xprt = xprt_create_proto(proto, &server->addr, &timeparms); 1683 if (IS_ERR(xprt)) { 1684 up_write(&clp->cl_sem); 1685 err = PTR_ERR(xprt); 1686 dprintk("%s: cannot create RPC transport. Error = %d\n", 1687 __FUNCTION__, err); 1688 goto out_fail; 1689 } 1690 clnt = rpc_create_client(xprt, server->hostname, &nfs_program, 1691 server->rpc_ops->version, authflavour); 1692 if (IS_ERR(clnt)) { 1693 up_write(&clp->cl_sem); 1694 err = PTR_ERR(clnt); 1695 dprintk("%s: cannot create RPC client. Error = %d\n", 1696 __FUNCTION__, err); 1697 goto out_fail; 1698 } 1699 clnt->cl_intr = 1; 1700 clnt->cl_softrtry = 1; 1701 clnt->cl_chatty = 1; 1702 clp->cl_rpcclient = clnt; 1703 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0); 1704 if (IS_ERR(clp->cl_cred)) { 1705 up_write(&clp->cl_sem); 1706 err = PTR_ERR(clp->cl_cred); 1707 clp->cl_cred = NULL; 1708 goto out_fail; 1709 } 1710 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); 1711 nfs_idmap_new(clp); 1712 } 1713 if (list_empty(&clp->cl_superblocks)) { 1714 err = nfs4_init_client(clp); 1715 if (err != 0) { 1716 up_write(&clp->cl_sem); 1717 goto out_fail; 1718 } 1719 } 1720 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); 1721 clnt = rpc_clone_client(clp->cl_rpcclient); 1722 if (!IS_ERR(clnt)) 1723 server->nfs4_state = clp; 1724 up_write(&clp->cl_sem); 1725 clp = NULL; 1726 1727 if (IS_ERR(clnt)) { 1728 err = PTR_ERR(clnt); 1729 dprintk("%s: cannot create RPC client. Error = %d\n", 1730 __FUNCTION__, err); 1731 return err; 1732 } 1733 1734 server->client = clnt; 1735 1736 if (server->nfs4_state->cl_idmap == NULL) { 1737 dprintk("%s: failed to create idmapper.\n", __FUNCTION__); 1738 return -ENOMEM; 1739 } 1740 1741 if (clnt->cl_auth->au_flavor != authflavour) { 1742 struct rpc_auth *auth; 1743 1744 auth = rpcauth_create(authflavour, clnt); 1745 if (IS_ERR(auth)) { 1746 dprintk("%s: couldn't create credcache!\n", __FUNCTION__); 1747 return PTR_ERR(auth); 1748 } 1749 } 1750 1751 sb->s_time_gran = 1; 1752 1753 sb->s_op = &nfs4_sops; 1754 err = nfs_sb_init(sb, authflavour); 1755 if (err == 0) 1756 return 0; 1757 out_fail: 1758 if (clp) 1759 nfs4_put_client(clp); 1760 return err; 1761 } 1762 1763 static int nfs4_compare_super(struct super_block *sb, void *data) 1764 { 1765 struct nfs_server *server = data; 1766 struct nfs_server *old = NFS_SB(sb); 1767 1768 if (strcmp(server->hostname, old->hostname) != 0) 1769 return 0; 1770 if (strcmp(server->mnt_path, old->mnt_path) != 0) 1771 return 0; 1772 return 1; 1773 } 1774 1775 static void * 1776 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) 1777 { 1778 void *p = NULL; 1779 1780 if (!src->len) 1781 return ERR_PTR(-EINVAL); 1782 if (src->len < maxlen) 1783 maxlen = src->len; 1784 if (dst == NULL) { 1785 p = dst = kmalloc(maxlen + 1, GFP_KERNEL); 1786 if (p == NULL) 1787 return ERR_PTR(-ENOMEM); 1788 } 1789 if (copy_from_user(dst, src->data, maxlen)) { 1790 if (p != NULL) 1791 kfree(p); 1792 return ERR_PTR(-EFAULT); 1793 } 1794 dst[maxlen] = '\0'; 1795 return dst; 1796 } 1797 1798 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type, 1799 int flags, const char *dev_name, void *raw_data) 1800 { 1801 int error; 1802 struct nfs_server *server; 1803 struct super_block *s; 1804 struct nfs4_mount_data *data = raw_data; 1805 void *p; 1806 1807 if (data == NULL) { 1808 dprintk("%s: missing data argument\n", __FUNCTION__); 1809 return ERR_PTR(-EINVAL); 1810 } 1811 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { 1812 dprintk("%s: bad mount version\n", __FUNCTION__); 1813 return ERR_PTR(-EINVAL); 1814 } 1815 1816 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); 1817 if (!server) 1818 return ERR_PTR(-ENOMEM); 1819 memset(server, 0, sizeof(struct nfs_server)); 1820 /* Zero out the NFS state stuff */ 1821 init_nfsv4_state(server); 1822 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); 1823 1824 p = nfs_copy_user_string(NULL, &data->hostname, 256); 1825 if (IS_ERR(p)) 1826 goto out_err; 1827 server->hostname = p; 1828 1829 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); 1830 if (IS_ERR(p)) 1831 goto out_err; 1832 server->mnt_path = p; 1833 1834 p = nfs_copy_user_string(server->ip_addr, &data->client_addr, 1835 sizeof(server->ip_addr) - 1); 1836 if (IS_ERR(p)) 1837 goto out_err; 1838 1839 /* We now require that the mount process passes the remote address */ 1840 if (data->host_addrlen != sizeof(server->addr)) { 1841 s = ERR_PTR(-EINVAL); 1842 goto out_free; 1843 } 1844 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { 1845 s = ERR_PTR(-EFAULT); 1846 goto out_free; 1847 } 1848 if (server->addr.sin_family != AF_INET || 1849 server->addr.sin_addr.s_addr == INADDR_ANY) { 1850 dprintk("%s: mount program didn't pass remote IP address!\n", 1851 __FUNCTION__); 1852 s = ERR_PTR(-EINVAL); 1853 goto out_free; 1854 } 1855 1856 /* Fire up rpciod if not yet running */ 1857 s = ERR_PTR(rpciod_up()); 1858 if (IS_ERR(s)) { 1859 dprintk("%s: couldn't start rpciod! Error = %ld\n", 1860 __FUNCTION__, PTR_ERR(s)); 1861 goto out_free; 1862 } 1863 1864 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); 1865 1866 if (IS_ERR(s) || s->s_root) 1867 goto out_free; 1868 1869 s->s_flags = flags; 1870 1871 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); 1872 if (error) { 1873 up_write(&s->s_umount); 1874 deactivate_super(s); 1875 return ERR_PTR(error); 1876 } 1877 s->s_flags |= MS_ACTIVE; 1878 return s; 1879 out_err: 1880 s = (struct super_block *)p; 1881 out_free: 1882 if (server->mnt_path) 1883 kfree(server->mnt_path); 1884 if (server->hostname) 1885 kfree(server->hostname); 1886 kfree(server); 1887 return s; 1888 } 1889 1890 static void nfs4_kill_super(struct super_block *sb) 1891 { 1892 struct nfs_server *server = NFS_SB(sb); 1893 1894 nfs_return_all_delegations(sb); 1895 kill_anon_super(sb); 1896 1897 nfs4_renewd_prepare_shutdown(server); 1898 1899 if (server->client != NULL && !IS_ERR(server->client)) 1900 rpc_shutdown_client(server->client); 1901 rpciod_down(); /* release rpciod */ 1902 1903 destroy_nfsv4_state(server); 1904 1905 if (server->hostname != NULL) 1906 kfree(server->hostname); 1907 kfree(server); 1908 } 1909 1910 static struct file_system_type nfs4_fs_type = { 1911 .owner = THIS_MODULE, 1912 .name = "nfs4", 1913 .get_sb = nfs4_get_sb, 1914 .kill_sb = nfs4_kill_super, 1915 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, 1916 }; 1917 1918 #define nfs4_init_once(nfsi) \ 1919 do { \ 1920 INIT_LIST_HEAD(&(nfsi)->open_states); \ 1921 nfsi->delegation = NULL; \ 1922 nfsi->delegation_state = 0; \ 1923 init_rwsem(&nfsi->rwsem); \ 1924 } while(0) 1925 #define register_nfs4fs() register_filesystem(&nfs4_fs_type) 1926 #define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type) 1927 #else 1928 #define nfs4_init_once(nfsi) \ 1929 do { } while (0) 1930 #define register_nfs4fs() (0) 1931 #define unregister_nfs4fs() 1932 #endif 1933 1934 extern int nfs_init_nfspagecache(void); 1935 extern void nfs_destroy_nfspagecache(void); 1936 extern int nfs_init_readpagecache(void); 1937 extern void nfs_destroy_readpagecache(void); 1938 extern int nfs_init_writepagecache(void); 1939 extern void nfs_destroy_writepagecache(void); 1940 #ifdef CONFIG_NFS_DIRECTIO 1941 extern int nfs_init_directcache(void); 1942 extern void nfs_destroy_directcache(void); 1943 #endif 1944 1945 static kmem_cache_t * nfs_inode_cachep; 1946 1947 static struct inode *nfs_alloc_inode(struct super_block *sb) 1948 { 1949 struct nfs_inode *nfsi; 1950 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL); 1951 if (!nfsi) 1952 return NULL; 1953 nfsi->flags = 0; 1954 #ifdef CONFIG_NFS_V3_ACL 1955 nfsi->acl_access = ERR_PTR(-EAGAIN); 1956 nfsi->acl_default = ERR_PTR(-EAGAIN); 1957 #endif 1958 #ifdef CONFIG_NFS_V4 1959 nfsi->nfs4_acl = NULL; 1960 #endif /* CONFIG_NFS_V4 */ 1961 return &nfsi->vfs_inode; 1962 } 1963 1964 static void nfs_destroy_inode(struct inode *inode) 1965 { 1966 kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); 1967 } 1968 1969 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 1970 { 1971 struct nfs_inode *nfsi = (struct nfs_inode *) foo; 1972 1973 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 1974 SLAB_CTOR_CONSTRUCTOR) { 1975 inode_init_once(&nfsi->vfs_inode); 1976 spin_lock_init(&nfsi->req_lock); 1977 INIT_LIST_HEAD(&nfsi->dirty); 1978 INIT_LIST_HEAD(&nfsi->commit); 1979 INIT_LIST_HEAD(&nfsi->open_files); 1980 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); 1981 atomic_set(&nfsi->data_updates, 0); 1982 nfsi->ndirty = 0; 1983 nfsi->ncommit = 0; 1984 nfsi->npages = 0; 1985 init_waitqueue_head(&nfsi->nfs_i_wait); 1986 nfs4_init_once(nfsi); 1987 } 1988 } 1989 1990 static int nfs_init_inodecache(void) 1991 { 1992 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", 1993 sizeof(struct nfs_inode), 1994 0, SLAB_RECLAIM_ACCOUNT, 1995 init_once, NULL); 1996 if (nfs_inode_cachep == NULL) 1997 return -ENOMEM; 1998 1999 return 0; 2000 } 2001 2002 static void nfs_destroy_inodecache(void) 2003 { 2004 if (kmem_cache_destroy(nfs_inode_cachep)) 2005 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n"); 2006 } 2007 2008 /* 2009 * Initialize NFS 2010 */ 2011 static int __init init_nfs_fs(void) 2012 { 2013 int err; 2014 2015 err = nfs_init_nfspagecache(); 2016 if (err) 2017 goto out4; 2018 2019 err = nfs_init_inodecache(); 2020 if (err) 2021 goto out3; 2022 2023 err = nfs_init_readpagecache(); 2024 if (err) 2025 goto out2; 2026 2027 err = nfs_init_writepagecache(); 2028 if (err) 2029 goto out1; 2030 2031 #ifdef CONFIG_NFS_DIRECTIO 2032 err = nfs_init_directcache(); 2033 if (err) 2034 goto out0; 2035 #endif 2036 2037 #ifdef CONFIG_PROC_FS 2038 rpc_proc_register(&nfs_rpcstat); 2039 #endif 2040 err = register_filesystem(&nfs_fs_type); 2041 if (err) 2042 goto out; 2043 if ((err = register_nfs4fs()) != 0) 2044 goto out; 2045 return 0; 2046 out: 2047 #ifdef CONFIG_PROC_FS 2048 rpc_proc_unregister("nfs"); 2049 #endif 2050 nfs_destroy_writepagecache(); 2051 #ifdef CONFIG_NFS_DIRECTIO 2052 out0: 2053 nfs_destroy_directcache(); 2054 #endif 2055 out1: 2056 nfs_destroy_readpagecache(); 2057 out2: 2058 nfs_destroy_inodecache(); 2059 out3: 2060 nfs_destroy_nfspagecache(); 2061 out4: 2062 return err; 2063 } 2064 2065 static void __exit exit_nfs_fs(void) 2066 { 2067 #ifdef CONFIG_NFS_DIRECTIO 2068 nfs_destroy_directcache(); 2069 #endif 2070 nfs_destroy_writepagecache(); 2071 nfs_destroy_readpagecache(); 2072 nfs_destroy_inodecache(); 2073 nfs_destroy_nfspagecache(); 2074 #ifdef CONFIG_PROC_FS 2075 rpc_proc_unregister("nfs"); 2076 #endif 2077 unregister_filesystem(&nfs_fs_type); 2078 unregister_nfs4fs(); 2079 } 2080 2081 /* Not quite true; I just maintain it */ 2082 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 2083 MODULE_LICENSE("GPL"); 2084 2085 module_init(init_nfs_fs) 2086 module_exit(exit_nfs_fs) 2087