fs/nfs/inode.c

   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         truncate_inode_pages(&inode->i_data, 0);
 150
 151         nfs_wb_all(inode);
 152         /*
 153          * The following should never happen...
 154          */
 155         if (nfs_have_writebacks(inode)) {
 156                 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
 157         }
 158
 159         clear_inode(inode);
 160 }
 161
 162 static void
 163 nfs_clear_inode(struct inode *inode)
 164 {
 165         struct nfs_inode *nfsi = NFS_I(inode);
 166         struct rpc_cred *cred;
 167
 168         nfs_wb_all(inode);
 169         BUG_ON (!list_empty(&nfsi->open_files));
 170         nfs_zap_acl_cache(inode);
 171         cred = nfsi->cache_access.cred;
 172         if (cred)
 173                 put_rpccred(cred);
 174         BUG_ON(atomic_read(&nfsi->data_updates) != 0);
 175 }
 176
 177 void
 178 nfs_umount_begin(struct super_block *sb)
 179 {
 180         struct rpc_clnt *rpc = NFS_SB(sb)->client;
 181
 182         /* -EIO all pending I/O */
 183         if (!IS_ERR(rpc))
 184                 rpc_killall_tasks(rpc);
 185         rpc = NFS_SB(sb)->client_acl;
 186         if (!IS_ERR(rpc))
 187                 rpc_killall_tasks(rpc);
 188 }
 189
 190
 191 static inline unsigned long
 192 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 193 {
 194         /* make sure blocksize is a power of two */
 195         if ((bsize & (bsize - 1)) || nrbitsp) {
 196                 unsigned char   nrbits;
 197
 198                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 199                         ;
 200                 bsize = 1 << nrbits;
 201                 if (nrbitsp)
 202                         *nrbitsp = nrbits;
 203         }
 204
 205         return bsize;
 206 }
 207
 208 /*
 209  * Calculate the number of 512byte blocks used.
 210  */
 211 static inline unsigned long
 212 nfs_calc_block_size(u64 tsize)
 213 {
 214         loff_t used = (tsize + 511) >> 9;
 215         return (used > ULONG_MAX) ? ULONG_MAX : used;
 216 }
 217
 218 /*
 219  * Compute and set NFS server blocksize
 220  */
 221 static inline unsigned long
 222 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 223 {
 224         if (bsize < 1024)
 225                 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
 226         else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
 227                 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
 228
 229         return nfs_block_bits(bsize, nrbitsp);
 230 }
 231
 232 /*
 233  * Obtain the root inode of the file system.
 234  */
 235 static struct inode *
 236 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
 237 {
 238         struct nfs_server       *server = NFS_SB(sb);
 239         struct inode *rooti;
 240         int                     error;
 241
 242         error = server->rpc_ops->getroot(server, rootfh, fsinfo);
 243         if (error < 0) {
 244                 dprintk("nfs_get_root: getattr error = %d\n", -error);
 245                 return ERR_PTR(error);
 246         }
 247
 248         rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
 249         if (!rooti)
 250                 return ERR_PTR(-ENOMEM);
 251         return rooti;
 252 }
 253
 254 /*
 255  * Do NFS version-independent mount processing, and sanity checking
 256  */
 257 static int
 258 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
 259 {
 260         struct nfs_server       *server;
 261         struct inode            *root_inode;
 262         struct nfs_fattr        fattr;
 263         struct nfs_fsinfo       fsinfo = {
 264                                         .fattr = &fattr,
 265                                 };
 266         struct nfs_pathconf pathinfo = {
 267                         .fattr = &fattr,
 268         };
 269         int no_root_error = 0;
 270         unsigned long max_rpc_payload;
 271
 272         /* We probably want something more informative here */
 273         snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
 274
 275         server = NFS_SB(sb);
 276
 277         sb->s_magic      = NFS_SUPER_MAGIC;
 278
 279         root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
 280         /* Did getting the root inode fail? */
 281         if (IS_ERR(root_inode)) {
 282                 no_root_error = PTR_ERR(root_inode);
 283                 goto out_no_root;
 284         }
 285         sb->s_root = d_alloc_root(root_inode);
 286         if (!sb->s_root) {
 287                 no_root_error = -ENOMEM;
 288                 goto out_no_root;
 289         }
 290         sb->s_root->d_op = server->rpc_ops->dentry_ops;
 291
 292         /* Get some general file system info */
 293         if (server->namelen == 0 &&
 294             server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
 295                 server->namelen = pathinfo.max_namelen;
 296         /* Work out a lot of parameters */
 297         if (server->rsize == 0)
 298                 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
 299         if (server->wsize == 0)
 300                 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
 301
 302         if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
 303                 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
 304         if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
 305                 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
 306
 307         max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
 308         if (server->rsize > max_rpc_payload)
 309                 server->rsize = max_rpc_payload;
 310         if (server->wsize > max_rpc_payload)
 311                 server->wsize = max_rpc_payload;
 312
 313         server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 314         if (server->rpages > NFS_READ_MAXIOV) {
 315                 server->rpages = NFS_READ_MAXIOV;
 316                 server->rsize = server->rpages << PAGE_CACHE_SHIFT;
 317         }
 318
 319         server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 320         if (server->wpages > NFS_WRITE_MAXIOV) {
 321                 server->wpages = NFS_WRITE_MAXIOV;
 322                 server->wsize = server->wpages << PAGE_CACHE_SHIFT;
 323         }
 324
 325         if (sb->s_blocksize == 0)
 326                 sb->s_blocksize = nfs_block_bits(server->wsize,
 327                                                          &sb->s_blocksize_bits);
 328         server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
 329
 330         server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
 331         if (server->dtsize > PAGE_CACHE_SIZE)
 332                 server->dtsize = PAGE_CACHE_SIZE;
 333         if (server->dtsize > server->rsize)
 334                 server->dtsize = server->rsize;
 335
 336         if (server->flags & NFS_MOUNT_NOAC) {
 337                 server->acregmin = server->acregmax = 0;
 338                 server->acdirmin = server->acdirmax = 0;
 339                 sb->s_flags |= MS_SYNCHRONOUS;
 340         }
 341         server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
 342
 343         sb->s_maxbytes = fsinfo.maxfilesize;
 344         if (sb->s_maxbytes > MAX_LFS_FILESIZE)
 345                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 346
 347         server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
 348         server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
 349
 350         /* We're airborne Set socket buffersize */
 351         rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
 352         return 0;
 353         /* Yargs. It didn't work out. */
 354 out_no_root:
 355         dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
 356         if (!IS_ERR(root_inode))
 357                 iput(root_inode);
 358         return no_root_error;
 359 }
 360
 361 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
 362 {
 363         to->to_initval = timeo * HZ / 10;
 364         to->to_retries = retrans;
 365         if (!to->to_retries)
 366                 to->to_retries = 2;
 367
 368         switch (proto) {
 369         case IPPROTO_TCP:
 370                 if (!to->to_initval)
 371                         to->to_initval = 60 * HZ;
 372                 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
 373                         to->to_initval = NFS_MAX_TCP_TIMEOUT;
 374                 to->to_increment = to->to_initval;
 375                 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
 376                 to->to_exponential = 0;
 377                 break;
 378         case IPPROTO_UDP:
 379         default:
 380                 if (!to->to_initval)
 381                         to->to_initval = 11 * HZ / 10;
 382                 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
 383                         to->to_initval = NFS_MAX_UDP_TIMEOUT;
 384                 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
 385                 to->to_exponential = 1;
 386                 break;
 387         }
 388 }
 389
 390 /*
 391  * Create an RPC client handle.
 392  */
 393 static struct rpc_clnt *
 394 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
 395 {
 396         struct rpc_timeout      timeparms;
 397         struct rpc_xprt         *xprt = NULL;
 398         struct rpc_clnt         *clnt = NULL;
 399         int                     proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
 400
 401         nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
 402
 403         /* create transport and client */
 404         xprt = xprt_create_proto(proto, &server->addr, &timeparms);
 405         if (IS_ERR(xprt)) {
 406                 dprintk("%s: cannot create RPC transport. Error = %ld\n",
 407                                 __FUNCTION__, PTR_ERR(xprt));
 408                 return (struct rpc_clnt *)xprt;
 409         }
 410         clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
 411                                  server->rpc_ops->version, data->pseudoflavor);
 412         if (IS_ERR(clnt)) {
 413                 dprintk("%s: cannot create RPC client. Error = %ld\n",
 414                                 __FUNCTION__, PTR_ERR(xprt));
 415                 goto out_fail;
 416         }
 417
 418         clnt->cl_intr     = 1;
 419         clnt->cl_softrtry = 1;
 420         clnt->cl_chatty   = 1;
 421
 422         return clnt;
 423
 424 out_fail:
 425         return clnt;
 426 }
 427
 428 /*
 429  * The way this works is that the mount process passes a structure
 430  * in the data argument which contains the server's IP address
 431  * and the root file handle obtained from the server's mount
 432  * daemon. We stash these away in the private superblock fields.
 433  */
 434 static int
 435 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
 436 {
 437         struct nfs_server       *server;
 438         rpc_authflavor_t        authflavor;
 439
 440         server           = NFS_SB(sb);
 441         sb->s_blocksize_bits = 0;
 442         sb->s_blocksize = 0;
 443         if (data->bsize)
 444                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
 445         if (data->rsize)
 446                 server->rsize = nfs_block_size(data->rsize, NULL);
 447         if (data->wsize)
 448                 server->wsize = nfs_block_size(data->wsize, NULL);
 449         server->flags    = data->flags & NFS_MOUNT_FLAGMASK;
 450
 451         server->acregmin = data->acregmin*HZ;
 452         server->acregmax = data->acregmax*HZ;
 453         server->acdirmin = data->acdirmin*HZ;
 454         server->acdirmax = data->acdirmax*HZ;
 455
 456         /* Start lockd here, before we might error out */
 457         if (!(server->flags & NFS_MOUNT_NONLM))
 458                 lockd_up();
 459
 460         server->namelen  = data->namlen;
 461         server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
 462         if (!server->hostname)
 463                 return -ENOMEM;
 464         strcpy(server->hostname, data->hostname);
 465
 466         /* Check NFS protocol revision and initialize RPC op vector
 467          * and file handle pool. */
 468 #ifdef CONFIG_NFS_V3
 469         if (server->flags & NFS_MOUNT_VER3) {
 470                 server->rpc_ops = &nfs_v3_clientops;
 471                 server->caps |= NFS_CAP_READDIRPLUS;
 472         } else {
 473                 server->rpc_ops = &nfs_v2_clientops;
 474         }
 475 #else
 476         server->rpc_ops = &nfs_v2_clientops;
 477 #endif
 478
 479         /* Fill in pseudoflavor for mount version < 5 */
 480         if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
 481                 data->pseudoflavor = RPC_AUTH_UNIX;
 482         authflavor = data->pseudoflavor;        /* save for sb_init() */
 483         /* XXX maybe we want to add a server->pseudoflavor field */
 484
 485         /* Create RPC client handles */
 486         server->client = nfs_create_client(server, data);
 487         if (IS_ERR(server->client))
 488                 return PTR_ERR(server->client);
 489         /* RFC 2623, sec 2.3.2 */
 490         if (authflavor != RPC_AUTH_UNIX) {
 491                 struct rpc_auth *auth;
 492
 493                 server->client_sys = rpc_clone_client(server->client);
 494                 if (IS_ERR(server->client_sys))
 495                         return PTR_ERR(server->client_sys);
 496                 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
 497                 if (IS_ERR(auth))
 498                         return PTR_ERR(auth);
 499         } else {
 500                 atomic_inc(&server->client->cl_count);
 501                 server->client_sys = server->client;
 502         }
 503         if (server->flags & NFS_MOUNT_VER3) {
 504 #ifdef CONFIG_NFS_V3_ACL
 505                 if (!(server->flags & NFS_MOUNT_NOACL)) {
 506                         server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
 507                         /* No errors! Assume that Sun nfsacls are supported */
 508                         if (!IS_ERR(server->client_acl))
 509                                 server->caps |= NFS_CAP_ACLS;
 510                 }
 511 #else
 512                 server->flags &= ~NFS_MOUNT_NOACL;
 513 #endif /* CONFIG_NFS_V3_ACL */
 514                 /*
 515                  * The VFS shouldn't apply the umask to mode bits. We will
 516                  * do so ourselves when necessary.
 517                  */
 518                 sb->s_flags |= MS_POSIXACL;
 519                 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
 520                         server->namelen = NFS3_MAXNAMLEN;
 521                 sb->s_time_gran = 1;
 522         } else {
 523                 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
 524                         server->namelen = NFS2_MAXNAMLEN;
 525         }
 526
 527         sb->s_op = &nfs_sops;
 528         return nfs_sb_init(sb, authflavor);
 529 }
 530
 531 static int
 532 nfs_statfs(struct super_block *sb, struct kstatfs *buf)
 533 {
 534         struct nfs_server *server = NFS_SB(sb);
 535         unsigned char blockbits;
 536         unsigned long blockres;
 537         struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
 538         struct nfs_fattr fattr;
 539         struct nfs_fsstat res = {
 540                         .fattr = &fattr,
 541         };
 542         int error;
 543
 544         lock_kernel();
 545
 546         error = server->rpc_ops->statfs(server, rootfh, &res);
 547         buf->f_type = NFS_SUPER_MAGIC;
 548         if (error < 0)
 549                 goto out_err;
 550
 551         /*
 552          * Current versions of glibc do not correctly handle the
 553          * case where f_frsize != f_bsize.  Eventually we want to
 554          * report the value of wtmult in this field.
 555          */
 556         buf->f_frsize = sb->s_blocksize;
 557
 558         /*
 559          * On most *nix systems, f_blocks, f_bfree, and f_bavail
 560          * are reported in units of f_frsize.  Linux hasn't had
 561          * an f_frsize field in its statfs struct until recently,
 562          * thus historically Linux's sys_statfs reports these
 563          * fields in units of f_bsize.
 564          */
 565         buf->f_bsize = sb->s_blocksize;
 566         blockbits = sb->s_blocksize_bits;
 567         blockres = (1 << blockbits) - 1;
 568         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
 569         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
 570         buf->f_bavail = (res.abytes + blockres) >> blockbits;
 571
 572         buf->f_files = res.tfiles;
 573         buf->f_ffree = res.afiles;
 574
 575         buf->f_namelen = server->namelen;
 576  out:
 577         unlock_kernel();
 578
 579         return 0;
 580
 581  out_err:
 582         printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
 583         buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
 584         goto out;
 585
 586 }
 587
 588 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
 589 {
 590         static struct proc_nfs_info {
 591                 int flag;
 592                 char *str;
 593                 char *nostr;
 594         } nfs_info[] = {
 595                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
 596                 { NFS_MOUNT_INTR, ",intr", "" },
 597                 { NFS_MOUNT_POSIX, ",posix", "" },
 598                 { NFS_MOUNT_NOCTO, ",nocto", "" },
 599                 { NFS_MOUNT_NOAC, ",noac", "" },
 600                 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
 601                 { NFS_MOUNT_NOACL, ",noacl", "" },
 602                 { 0, NULL, NULL }
 603         };
 604         struct proc_nfs_info *nfs_infop;
 605         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
 606         char buf[12];
 607         char *proto;
 608
 609         seq_printf(m, ",v%d", nfss->rpc_ops->version);
 610         seq_printf(m, ",rsize=%d", nfss->rsize);
 611         seq_printf(m, ",wsize=%d", nfss->wsize);
 612         if (nfss->acregmin != 3*HZ)
 613                 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
 614         if (nfss->acregmax != 60*HZ)
 615                 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
 616         if (nfss->acdirmin != 30*HZ)
 617                 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
 618         if (nfss->acdirmax != 60*HZ)
 619                 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
 620         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
 621                 if (nfss->flags & nfs_infop->flag)
 622                         seq_puts(m, nfs_infop->str);
 623                 else
 624                         seq_puts(m, nfs_infop->nostr);
 625         }
 626         switch (nfss->client->cl_xprt->prot) {
 627                 case IPPROTO_TCP:
 628                         proto = "tcp";
 629                         break;
 630                 case IPPROTO_UDP:
 631                         proto = "udp";
 632                         break;
 633                 default:
 634                         snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
 635                         proto = buf;
 636         }
 637         seq_printf(m, ",proto=%s", proto);
 638         seq_puts(m, ",addr=");
 639         seq_escape(m, nfss->hostname, " \t\n\\");
 640         return 0;
 641 }
 642
 643 /*
 644  * Invalidate the local caches
 645  */
 646 void
 647 nfs_zap_caches(struct inode *inode)
 648 {
 649         struct nfs_inode *nfsi = NFS_I(inode);
 650         int mode = inode->i_mode;
 651
 652         spin_lock(&inode->i_lock);
 653
 654         NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
 655         NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
 656
 657         memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
 658         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
 659                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
 660         else
 661                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
 662
 663         spin_unlock(&inode->i_lock);
 664 }
 665
 666 static void nfs_zap_acl_cache(struct inode *inode)
 667 {
 668         void (*clear_acl_cache)(struct inode *);
 669
 670         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
 671         if (clear_acl_cache != NULL)
 672                 clear_acl_cache(inode);
 673         spin_lock(&inode->i_lock);
 674         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
 675         spin_unlock(&inode->i_lock);
 676 }
 677
 678 /*
 679  * Invalidate, but do not unhash, the inode
 680  */
 681 static void
 682 nfs_invalidate_inode(struct inode *inode)
 683 {
 684         umode_t save_mode = inode->i_mode;
 685
 686         make_bad_inode(inode);
 687         inode->i_mode = save_mode;
 688         nfs_zap_caches(inode);
 689 }
 690
 691 struct nfs_find_desc {
 692         struct nfs_fh           *fh;
 693         struct nfs_fattr        *fattr;
 694 };
 695
 696 /*
 697  * In NFSv3 we can have 64bit inode numbers. In order to support
 698  * this, and re-exported directories (also seen in NFSv2)
 699  * we are forced to allow 2 different inodes to have the same
 700  * i_ino.
 701  */
 702 static int
 703 nfs_find_actor(struct inode *inode, void *opaque)
 704 {
 705         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
 706         struct nfs_fh           *fh = desc->fh;
 707         struct nfs_fattr        *fattr = desc->fattr;
 708
 709         if (NFS_FILEID(inode) != fattr->fileid)
 710                 return 0;
 711         if (nfs_compare_fh(NFS_FH(inode), fh))
 712                 return 0;
 713         if (is_bad_inode(inode) || NFS_STALE(inode))
 714                 return 0;
 715         return 1;
 716 }
 717
 718 static int
 719 nfs_init_locked(struct inode *inode, void *opaque)
 720 {
 721         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
 722         struct nfs_fattr        *fattr = desc->fattr;
 723
 724         NFS_FILEID(inode) = fattr->fileid;
 725         nfs_copy_fh(NFS_FH(inode), desc->fh);
 726         return 0;
 727 }
 728
 729 /* Don't use READDIRPLUS on directories that we believe are too large */
 730 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
 731
 732 /*
 733  * This is our front-end to iget that looks up inodes by file handle
 734  * instead of inode number.
 735  */
 736 struct inode *
 737 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
 738 {
 739         struct nfs_find_desc desc = {
 740                 .fh     = fh,
 741                 .fattr  = fattr
 742         };
 743         struct inode *inode = NULL;
 744         unsigned long hash;
 745
 746         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
 747                 goto out_no_inode;
 748
 749         if (!fattr->nlink) {
 750                 printk("NFS: Buggy server - nlink == 0!\n");
 751                 goto out_no_inode;
 752         }
 753
 754         hash = nfs_fattr_to_ino_t(fattr);
 755
 756         if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
 757                 goto out_no_inode;
 758
 759         if (inode->i_state & I_NEW) {
 760                 struct nfs_inode *nfsi = NFS_I(inode);
 761
 762                 /* We set i_ino for the few things that still rely on it,
 763                  * such as stat(2) */
 764                 inode->i_ino = hash;
 765
 766                 /* We can't support update_atime(), since the server will reset it */
 767                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
 768                 inode->i_mode = fattr->mode;
 769                 /* Why so? Because we want revalidate for devices/FIFOs, and
 770                  * that's precisely what we have in nfs_file_inode_operations.
 771                  */
 772                 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
 773                 if (S_ISREG(inode->i_mode)) {
 774                         inode->i_fop = &nfs_file_operations;
 775                         inode->i_data.a_ops = &nfs_file_aops;
 776                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
 777                 } else if (S_ISDIR(inode->i_mode)) {
 778                         inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
 779                         inode->i_fop = &nfs_dir_operations;
 780                         if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
 781                             && fattr->size <= NFS_LIMIT_READDIRPLUS)
 782                                 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
 783                 } else if (S_ISLNK(inode->i_mode))
 784                         inode->i_op = &nfs_symlink_inode_operations;
 785                 else
 786                         init_special_inode(inode, inode->i_mode, fattr->rdev);
 787
 788                 nfsi->read_cache_jiffies = fattr->timestamp;
 789                 inode->i_atime = fattr->atime;
 790                 inode->i_mtime = fattr->mtime;
 791                 inode->i_ctime = fattr->ctime;
 792                 if (fattr->valid & NFS_ATTR_FATTR_V4)
 793                         nfsi->change_attr = fattr->change_attr;
 794                 inode->i_size = nfs_size_to_loff_t(fattr->size);
 795                 inode->i_nlink = fattr->nlink;
 796                 inode->i_uid = fattr->uid;
 797                 inode->i_gid = fattr->gid;
 798                 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
 799                         /*
 800                          * report the blocks in 512byte units
 801                          */
 802                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
 803                         inode->i_blksize = inode->i_sb->s_blocksize;
 804                 } else {
 805                         inode->i_blocks = fattr->du.nfs2.blocks;
 806                         inode->i_blksize = fattr->du.nfs2.blocksize;
 807                 }
 808                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 809                 nfsi->attrtimeo_timestamp = jiffies;
 810                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 811                 nfsi->cache_access.cred = NULL;
 812
 813                 unlock_new_inode(inode);
 814         } else
 815                 nfs_refresh_inode(inode, fattr);
 816         dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
 817                 inode->i_sb->s_id,
 818                 (long long)NFS_FILEID(inode),
 819                 atomic_read(&inode->i_count));
 820
 821 out:
 822         return inode;
 823
 824 out_no_inode:
 825         printk("nfs_fhget: iget failed\n");
 826         goto out;
 827 }
 828
 829 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
 830
 831 int
 832 nfs_setattr(struct dentry *dentry, struct iattr *attr)
 833 {
 834         struct inode *inode = dentry->d_inode;
 835         struct nfs_fattr fattr;
 836         int error;
 837
 838         if (attr->ia_valid & ATTR_SIZE) {
 839                 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
 840                         attr->ia_valid &= ~ATTR_SIZE;
 841         }
 842
 843         /* Optimization: if the end result is no change, don't RPC */
 844         attr->ia_valid &= NFS_VALID_ATTRS;
 845         if (attr->ia_valid == 0)
 846                 return 0;
 847
 848         lock_kernel();
 849         nfs_begin_data_update(inode);
 850         /* Write all dirty data if we're changing file permissions or size */
 851         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
 852                 if (filemap_fdatawrite(inode->i_mapping) == 0)
 853                         filemap_fdatawait(inode->i_mapping);
 854                 nfs_wb_all(inode);
 855         }
 856         error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
 857         if (error == 0)
 858                 nfs_refresh_inode(inode, &fattr);
 859         nfs_end_data_update(inode);
 860         unlock_kernel();
 861         return error;
 862 }
 863
 864 /**
 865  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 866  * @inode: pointer to struct inode
 867  * @attr: pointer to struct iattr
 868  *
 869  * Note: we do this in the *proc.c in order to ensure that
 870  *       it works for things like exclusive creates too.
 871  */
 872 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
 873 {
 874         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
 875                 if ((attr->ia_valid & ATTR_MODE) != 0) {
 876                         int mode = attr->ia_mode & S_IALLUGO;
 877                         mode |= inode->i_mode & ~S_IALLUGO;
 878                         inode->i_mode = mode;
 879                 }
 880                 if ((attr->ia_valid & ATTR_UID) != 0)
 881                         inode->i_uid = attr->ia_uid;
 882                 if ((attr->ia_valid & ATTR_GID) != 0)
 883                         inode->i_gid = attr->ia_gid;
 884                 spin_lock(&inode->i_lock);
 885                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
 886                 spin_unlock(&inode->i_lock);
 887         }
 888         if ((attr->ia_valid & ATTR_SIZE) != 0) {
 889                 inode->i_size = attr->ia_size;
 890                 vmtruncate(inode, attr->ia_size);
 891         }
 892 }
 893
 894 static int nfs_wait_schedule(void *word)
 895 {
 896         if (signal_pending(current))
 897                 return -ERESTARTSYS;
 898         schedule();
 899         return 0;
 900 }
 901
 902 /*
 903  * Wait for the inode to get unlocked.
 904  */
 905 static int nfs_wait_on_inode(struct inode *inode)
 906 {
 907         struct rpc_clnt *clnt = NFS_CLIENT(inode);
 908         struct nfs_inode *nfsi = NFS_I(inode);
 909         sigset_t oldmask;
 910         int error;
 911
 912         atomic_inc(&inode->i_count);
 913         rpc_clnt_sigmask(clnt, &oldmask);
 914         error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
 915                                         nfs_wait_schedule, TASK_INTERRUPTIBLE);
 916         rpc_clnt_sigunmask(clnt, &oldmask);
 917         iput(inode);
 918
 919         return error;
 920 }
 921
 922 static void nfs_wake_up_inode(struct inode *inode)
 923 {
 924         struct nfs_inode *nfsi = NFS_I(inode);
 925
 926         clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
 927         smp_mb__after_clear_bit();
 928         wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
 929 }
 930
 931 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 932 {
 933         struct inode *inode = dentry->d_inode;
 934         int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
 935         int err;
 936
 937         if (__IS_FLG(inode, MS_NOATIME))
 938                 need_atime = 0;
 939         else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
 940                 need_atime = 0;
 941         /* We may force a getattr if the user cares about atime */
 942         if (need_atime)
 943                 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
 944         else
 945                 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
 946         if (!err)
 947                 generic_fillattr(inode, stat);
 948         return err;
 949 }
 950
 951 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
 952 {
 953         struct nfs_open_context *ctx;
 954
 955         ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
 956         if (ctx != NULL) {
 957                 atomic_set(&ctx->count, 1);
 958                 ctx->dentry = dget(dentry);
 959                 ctx->cred = get_rpccred(cred);
 960                 ctx->state = NULL;
 961                 ctx->lockowner = current->files;
 962                 ctx->error = 0;
 963                 ctx->dir_cookie = 0;
 964         }
 965         return ctx;
 966 }
 967
 968 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
 969 {
 970         if (ctx != NULL)
 971                 atomic_inc(&ctx->count);
 972         return ctx;
 973 }
 974
 975 void put_nfs_open_context(struct nfs_open_context *ctx)
 976 {
 977         if (atomic_dec_and_test(&ctx->count)) {
 978                 if (!list_empty(&ctx->list)) {
 979                         struct inode *inode = ctx->dentry->d_inode;
 980                         spin_lock(&inode->i_lock);
 981                         list_del(&ctx->list);
 982                         spin_unlock(&inode->i_lock);
 983                 }
 984                 if (ctx->state != NULL)
 985                         nfs4_close_state(ctx->state, ctx->mode);
 986                 if (ctx->cred != NULL)
 987                         put_rpccred(ctx->cred);
 988                 dput(ctx->dentry);
 989                 kfree(ctx);
 990         }
 991 }
 992
 993 /*
 994  * Ensure that mmap has a recent RPC credential for use when writing out
 995  * shared pages
 996  */
 997 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
 998 {
 999         struct inode *inode = filp->f_dentry->d_inode;
1000         struct nfs_inode *nfsi = NFS_I(inode);
1001
1002         filp->private_data = get_nfs_open_context(ctx);
1003         spin_lock(&inode->i_lock);
1004         list_add(&ctx->list, &nfsi->open_files);
1005         spin_unlock(&inode->i_lock);
1006 }
1007
1008 struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
1009 {
1010         struct nfs_inode *nfsi = NFS_I(inode);
1011         struct nfs_open_context *pos, *ctx = NULL;
1012
1013         spin_lock(&inode->i_lock);
1014         list_for_each_entry(pos, &nfsi->open_files, list) {
1015                 if ((pos->mode & mode) == mode) {
1016                         ctx = get_nfs_open_context(pos);
1017                         break;
1018                 }
1019         }
1020         spin_unlock(&inode->i_lock);
1021         return ctx;
1022 }
1023
1024 void nfs_file_clear_open_context(struct file *filp)
1025 {
1026         struct inode *inode = filp->f_dentry->d_inode;
1027         struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
1028
1029         if (ctx) {
1030                 filp->private_data = NULL;
1031                 spin_lock(&inode->i_lock);
1032                 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1033                 spin_unlock(&inode->i_lock);
1034                 put_nfs_open_context(ctx);
1035         }
1036 }
1037
1038 /*
1039  * These allocate and release file read/write context information.
1040  */
1041 int nfs_open(struct inode *inode, struct file *filp)
1042 {
1043         struct nfs_open_context *ctx;
1044         struct rpc_cred *cred;
1045
1046         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1047         if (IS_ERR(cred))
1048                 return PTR_ERR(cred);
1049         ctx = alloc_nfs_open_context(filp->f_dentry, cred);
1050         put_rpccred(cred);
1051         if (ctx == NULL)
1052                 return -ENOMEM;
1053         ctx->mode = filp->f_mode;
1054         nfs_file_set_open_context(filp, ctx);
1055         put_nfs_open_context(ctx);
1056         if ((filp->f_mode & FMODE_WRITE) != 0)
1057                 nfs_begin_data_update(inode);
1058         return 0;
1059 }
1060
1061 int nfs_release(struct inode *inode, struct file *filp)
1062 {
1063         if ((filp->f_mode & FMODE_WRITE) != 0)
1064                 nfs_end_data_update(inode);
1065         nfs_file_clear_open_context(filp);
1066         return 0;
1067 }
1068
1069 /*
1070  * This function is called whenever some part of NFS notices that
1071  * the cached attributes have to be refreshed.
1072  */
1073 int
1074 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1075 {
1076         int              status = -ESTALE;
1077         struct nfs_fattr fattr;
1078         struct nfs_inode *nfsi = NFS_I(inode);
1079         unsigned long verifier;
1080         unsigned long cache_validity;
1081
1082         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1083                 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1084
1085         lock_kernel();
1086         if (!inode || is_bad_inode(inode))
1087                 goto out_nowait;
1088         if (NFS_STALE(inode))
1089                 goto out_nowait;
1090
1091         status = nfs_wait_on_inode(inode);
1092         if (status < 0)
1093                 goto out;
1094         if (NFS_STALE(inode)) {
1095                 status = -ESTALE;
1096                 /* Do we trust the cached ESTALE? */
1097                 if (NFS_ATTRTIMEO(inode) != 0) {
1098                         if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1099                                 /* no */
1100                         } else
1101                                 goto out;
1102                 }
1103         }
1104
1105         /* Protect against RPC races by saving the change attribute */
1106         verifier = nfs_save_change_attribute(inode);
1107         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1108         if (status != 0) {
1109                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1110                          inode->i_sb->s_id,
1111                          (long long)NFS_FILEID(inode), status);
1112                 if (status == -ESTALE) {
1113                         nfs_zap_caches(inode);
1114                         if (!S_ISDIR(inode->i_mode))
1115                                 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1116                 }
1117                 goto out;
1118         }
1119
1120         status = nfs_update_inode(inode, &fattr, verifier);
1121         if (status) {
1122                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1123                          inode->i_sb->s_id,
1124                          (long long)NFS_FILEID(inode), status);
1125                 goto out;
1126         }
1127         spin_lock(&inode->i_lock);
1128         cache_validity = nfsi->cache_validity;
1129         nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1130
1131         /*
1132          * We may need to keep the attributes marked as invalid if
1133          * we raced with nfs_end_attr_update().
1134          */
1135         if (verifier == nfsi->cache_change_attribute)
1136                 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1137         spin_unlock(&inode->i_lock);
1138
1139         nfs_revalidate_mapping(inode, inode->i_mapping);
1140
1141         if (cache_validity & NFS_INO_INVALID_ACL)
1142                 nfs_zap_acl_cache(inode);
1143
1144         dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1145                 inode->i_sb->s_id,
1146                 (long long)NFS_FILEID(inode));
1147
1148  out:
1149         nfs_wake_up_inode(inode);
1150
1151  out_nowait:
1152         unlock_kernel();
1153         return status;
1154 }
1155
1156 int nfs_attribute_timeout(struct inode *inode)
1157 {
1158         struct nfs_inode *nfsi = NFS_I(inode);
1159
1160         if (nfs_have_delegation(inode, FMODE_READ))
1161                 return 0;
1162         return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1163 }
1164
1165 /**
1166  * nfs_revalidate_inode - Revalidate the inode attributes
1167  * @server - pointer to nfs_server struct
1168  * @inode - pointer to inode struct
1169  *
1170  * Updates inode attribute information by retrieving the data from the server.
1171  */
1172 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1173 {
1174         if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1175                         && !nfs_attribute_timeout(inode))
1176                 return NFS_STALE(inode) ? -ESTALE : 0;
1177         return __nfs_revalidate_inode(server, inode);
1178 }
1179
1180 /**
1181  * nfs_revalidate_mapping - Revalidate the pagecache
1182  * @inode - pointer to host inode
1183  * @mapping - pointer to mapping
1184  */
1185 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1186 {
1187         struct nfs_inode *nfsi = NFS_I(inode);
1188
1189         if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
1190                 if (S_ISREG(inode->i_mode)) {
1191                         if (filemap_fdatawrite(mapping) == 0)
1192                                 filemap_fdatawait(mapping);
1193                         nfs_wb_all(inode);
1194                 }
1195                 invalidate_inode_pages2(mapping);
1196
1197                 spin_lock(&inode->i_lock);
1198                 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1199                 if (S_ISDIR(inode->i_mode)) {
1200                         memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1201                         /* This ensures we revalidate child dentries */
1202                         nfsi->cache_change_attribute++;
1203                 }
1204                 spin_unlock(&inode->i_lock);
1205
1206                 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1207                                 inode->i_sb->s_id,
1208                                 (long long)NFS_FILEID(inode));
1209         }
1210 }
1211
1212 /**
1213  * nfs_begin_data_update
1214  * @inode - pointer to inode
1215  * Declare that a set of operations will update file data on the server
1216  */
1217 void nfs_begin_data_update(struct inode *inode)
1218 {
1219         atomic_inc(&NFS_I(inode)->data_updates);
1220 }
1221
1222 /**
1223  * nfs_end_data_update
1224  * @inode - pointer to inode
1225  * Declare end of the operations that will update file data
1226  * This will mark the inode as immediately needing revalidation
1227  * of its attribute cache.
1228  */
1229 void nfs_end_data_update(struct inode *inode)
1230 {
1231         struct nfs_inode *nfsi = NFS_I(inode);
1232
1233         if (!nfs_have_delegation(inode, FMODE_READ)) {
1234                 /* Mark the attribute cache for revalidation */
1235                 spin_lock(&inode->i_lock);
1236                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1237                 /* Directories and symlinks: invalidate page cache too */
1238                 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1239                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1240                 spin_unlock(&inode->i_lock);
1241         }
1242         nfsi->cache_change_attribute ++;
1243         atomic_dec(&nfsi->data_updates);
1244 }
1245
1246 /**
1247  * nfs_refresh_inode - verify consistency of the inode attribute cache
1248  * @inode - pointer to inode
1249  * @fattr - updated attributes
1250  *
1251  * Verifies the attribute cache. If we have just changed the attributes,
1252  * so that fattr carries weak cache consistency data, then it may
1253  * also update the ctime/mtime/change_attribute.
1254  */
1255 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1256 {
1257         struct nfs_inode *nfsi = NFS_I(inode);
1258         loff_t cur_size, new_isize;
1259         int data_unstable;
1260
1261         /* Do we hold a delegation? */
1262         if (nfs_have_delegation(inode, FMODE_READ))
1263                 return 0;
1264
1265         spin_lock(&inode->i_lock);
1266
1267         /* Are we in the process of updating data on the server? */
1268         data_unstable = nfs_caches_unstable(inode);
1269
1270         if (fattr->valid & NFS_ATTR_FATTR_V4) {
1271                 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1272                                 && nfsi->change_attr == fattr->pre_change_attr)
1273                         nfsi->change_attr = fattr->change_attr;
1274                 if (nfsi->change_attr != fattr->change_attr) {
1275                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1276                         if (!data_unstable)
1277                                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1278                 }
1279         }
1280
1281         if ((fattr->valid & NFS_ATTR_FATTR) == 0) {
1282                 spin_unlock(&inode->i_lock);
1283                 return 0;
1284         }
1285
1286         /* Has the inode gone and changed behind our back? */
1287         if (nfsi->fileid != fattr->fileid
1288                         || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1289                 spin_unlock(&inode->i_lock);
1290                 return -EIO;
1291         }
1292
1293         cur_size = i_size_read(inode);
1294         new_isize = nfs_size_to_loff_t(fattr->size);
1295
1296         /* If we have atomic WCC data, we may update some attributes */
1297         if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1298                 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
1299                         memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1300                 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
1301                         memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1302         }
1303
1304         /* Verify a few of the more important attributes */
1305         if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1306                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1307                 if (!data_unstable)
1308                         nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1309         }
1310         if (cur_size != new_isize) {
1311                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1312                 if (nfsi->npages == 0)
1313                         nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1314         }
1315
1316         /* Have any file permissions changed? */
1317         if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1318                         || inode->i_uid != fattr->uid
1319                         || inode->i_gid != fattr->gid)
1320                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1321
1322         /* Has the link count changed? */
1323         if (inode->i_nlink != fattr->nlink)
1324                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1325
1326         if (!timespec_equal(&inode->i_atime, &fattr->atime))
1327                 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1328
1329         nfsi->read_cache_jiffies = fattr->timestamp;
1330         spin_unlock(&inode->i_lock);
1331         return 0;
1332 }
1333
1334 /*
1335  * Many nfs protocol calls return the new file attributes after
1336  * an operation.  Here we update the inode to reflect the state
1337  * of the server's inode.
1338  *
1339  * This is a bit tricky because we have to make sure all dirty pages
1340  * have been sent off to the server before calling invalidate_inode_pages.
1341  * To make sure no other process adds more write requests while we try
1342  * our best to flush them, we make them sleep during the attribute refresh.
1343  *
1344  * A very similar scenario holds for the dir cache.
1345  */
1346 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
1347 {
1348         struct nfs_inode *nfsi = NFS_I(inode);
1349         loff_t cur_isize, new_isize;
1350         unsigned int    invalid = 0;
1351         int data_unstable;
1352
1353         dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1354                         __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1355                         atomic_read(&inode->i_count), fattr->valid);
1356
1357         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1358                 return 0;
1359
1360         if (nfsi->fileid != fattr->fileid) {
1361                 printk(KERN_ERR "%s: inode number mismatch\n"
1362                        "expected (%s/0x%Lx), got (%s/0x%Lx)\n",
1363                        __FUNCTION__,
1364                        inode->i_sb->s_id, (long long)nfsi->fileid,
1365                        inode->i_sb->s_id, (long long)fattr->fileid);
1366                 goto out_err;
1367         }
1368
1369         spin_lock(&inode->i_lock);
1370
1371         /*
1372          * Make sure the inode's type hasn't changed.
1373          */
1374         if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1375                 spin_unlock(&inode->i_lock);
1376                 goto out_changed;
1377         }
1378
1379         /*
1380          * Update the read time so we don't revalidate too often.
1381          */
1382         nfsi->read_cache_jiffies = fattr->timestamp;
1383
1384         /* Are we racing with known updates of the metadata on the server? */
1385         data_unstable = ! nfs_verify_change_attribute(inode, verifier);
1386
1387         /* Check if our cached file size is stale */
1388         new_isize = nfs_size_to_loff_t(fattr->size);
1389         cur_isize = i_size_read(inode);
1390         if (new_isize != cur_isize) {
1391                 /* Do we perhaps have any outstanding writes? */
1392                 if (nfsi->npages == 0) {
1393                         /* No, but did we race with nfs_end_data_update()? */
1394                         if (verifier  ==  nfsi->cache_change_attribute) {
1395                                 inode->i_size = new_isize;
1396                                 invalid |= NFS_INO_INVALID_DATA;
1397                         }
1398                         invalid |= NFS_INO_INVALID_ATTR;
1399                 } else if (new_isize > cur_isize) {
1400                         inode->i_size = new_isize;
1401                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1402                 }
1403                 dprintk("NFS: isize change on server for file %s/%ld\n",
1404                                 inode->i_sb->s_id, inode->i_ino);
1405         }
1406
1407         /* Check if the mtime agrees */
1408         if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1409                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1410                 dprintk("NFS: mtime change on server for file %s/%ld\n",
1411                                 inode->i_sb->s_id, inode->i_ino);
1412                 if (!data_unstable)
1413                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1414         }
1415
1416         if ((fattr->valid & NFS_ATTR_FATTR_V4)
1417             && nfsi->change_attr != fattr->change_attr) {
1418                 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1419                        inode->i_sb->s_id, inode->i_ino);
1420                 nfsi->change_attr = fattr->change_attr;
1421                 if (!data_unstable)
1422                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1423         }
1424
1425         /* If ctime has changed we should definitely clear access+acl caches */
1426         if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1427                 if (!data_unstable)
1428                         invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1429                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1430         }
1431         memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1432
1433         if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1434             inode->i_uid != fattr->uid ||
1435             inode->i_gid != fattr->gid)
1436                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1437
1438         inode->i_mode = fattr->mode;
1439         inode->i_nlink = fattr->nlink;
1440         inode->i_uid = fattr->uid;
1441         inode->i_gid = fattr->gid;
1442
1443         if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1444                 /*
1445                  * report the blocks in 512byte units
1446                  */
1447                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1448                 inode->i_blksize = inode->i_sb->s_blocksize;
1449         } else {
1450                 inode->i_blocks = fattr->du.nfs2.blocks;
1451                 inode->i_blksize = fattr->du.nfs2.blocksize;
1452         }
1453
1454         /* Update attrtimeo value if we're out of the unstable period */
1455         if (invalid & NFS_INO_INVALID_ATTR) {
1456                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1457                 nfsi->attrtimeo_timestamp = jiffies;
1458         } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1459                 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1460                         nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1461                 nfsi->attrtimeo_timestamp = jiffies;
1462         }
1463         /* Don't invalidate the data if we were to blame */
1464         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1465                                 || S_ISLNK(inode->i_mode)))
1466                 invalid &= ~NFS_INO_INVALID_DATA;
1467         if (!nfs_have_delegation(inode, FMODE_READ))
1468                 nfsi->cache_validity |= invalid;
1469
1470         spin_unlock(&inode->i_lock);
1471         return 0;
1472  out_changed:
1473         /*
1474          * Big trouble! The inode has become a different object.
1475          */
1476 #ifdef NFS_PARANOIA
1477         printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1478                         __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1479 #endif
1480         /*
1481          * No need to worry about unhashing the dentry, as the
1482          * lookup validation will know that the inode is bad.
1483          * (But we fall through to invalidate the caches.)
1484          */
1485         nfs_invalidate_inode(inode);
1486  out_err:
1487         set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1488         return -ESTALE;
1489 }
1490
1491 /*
1492  * File system information
1493  */
1494
1495 static int nfs_set_super(struct super_block *s, void *data)
1496 {
1497         s->s_fs_info = data;
1498         return set_anon_super(s, data);
1499 }
1500
1501 static int nfs_compare_super(struct super_block *sb, void *data)
1502 {
1503         struct nfs_server *server = data;
1504         struct nfs_server *old = NFS_SB(sb);
1505
1506         if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1507                 return 0;
1508         if (old->addr.sin_port != server->addr.sin_port)
1509                 return 0;
1510         return !nfs_compare_fh(&old->fh, &server->fh);
1511 }
1512
1513 static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1514         int flags, const char *dev_name, void *raw_data)
1515 {
1516         int error;
1517         struct nfs_server *server = NULL;
1518         struct super_block *s;
1519         struct nfs_fh *root;
1520         struct nfs_mount_data *data = raw_data;
1521
1522         s = ERR_PTR(-EINVAL);
1523         if (data == NULL) {
1524                 dprintk("%s: missing data argument\n", __FUNCTION__);
1525                 goto out_err;
1526         }
1527         if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1528                 dprintk("%s: bad mount version\n", __FUNCTION__);
1529                 goto out_err;
1530         }
1531         switch (data->version) {
1532                 case 1:
1533                         data->namlen = 0;
1534                 case 2:
1535                         data->bsize  = 0;
1536                 case 3:
1537                         if (data->flags & NFS_MOUNT_VER3) {
1538                                 dprintk("%s: mount structure version %d does not support NFSv3\n",
1539                                                 __FUNCTION__,
1540                                                 data->version);
1541                                 goto out_err;
1542                         }
1543                         data->root.size = NFS2_FHSIZE;
1544                         memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1545                 case 4:
1546                         if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1547                                 dprintk("%s: mount structure version %d does not support strong security\n",
1548                                                 __FUNCTION__,
1549                                                 data->version);
1550                                 goto out_err;
1551                         }
1552                 case 5:
1553                         memset(data->context, 0, sizeof(data->context));
1554         }
1555 #ifndef CONFIG_NFS_V3
1556         /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1557         s = ERR_PTR(-EPROTONOSUPPORT);
1558         if (data->flags & NFS_MOUNT_VER3) {
1559                 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1560                 goto out_err;
1561         }
1562 #endif /* CONFIG_NFS_V3 */
1563
1564         s = ERR_PTR(-ENOMEM);
1565         server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1566         if (!server)
1567                 goto out_err;
1568         memset(server, 0, sizeof(struct nfs_server));
1569         /* Zero out the NFS state stuff */
1570         init_nfsv4_state(server);
1571         server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1572
1573         root = &server->fh;
1574         if (data->flags & NFS_MOUNT_VER3)
1575                 root->size = data->root.size;
1576         else
1577                 root->size = NFS2_FHSIZE;
1578         s = ERR_PTR(-EINVAL);
1579         if (root->size > sizeof(root->data)) {
1580                 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1581                 goto out_err;
1582         }
1583         memcpy(root->data, data->root.data, root->size);
1584
1585         /* We now require that the mount process passes the remote address */
1586         memcpy(&server->addr, &data->addr, sizeof(server->addr));
1587         if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1588                 dprintk("%s: mount program didn't pass remote address!\n",
1589                                 __FUNCTION__);
1590                 goto out_err;
1591         }
1592
1593         /* Fire up rpciod if not yet running */
1594         s = ERR_PTR(rpciod_up());
1595         if (IS_ERR(s)) {
1596                 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1597                                 __FUNCTION__, PTR_ERR(s));
1598                 goto out_err;
1599         }
1600
1601         s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1602         if (IS_ERR(s) || s->s_root)
1603                 goto out_rpciod_down;
1604
1605         s->s_flags = flags;
1606
1607         error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1608         if (error) {
1609                 up_write(&s->s_umount);
1610                 deactivate_super(s);
1611                 return ERR_PTR(error);
1612         }
1613         s->s_flags |= MS_ACTIVE;
1614         return s;
1615 out_rpciod_down:
1616         rpciod_down();
1617 out_err:
1618         kfree(server);
1619         return s;
1620 }
1621
1622 static void nfs_kill_super(struct super_block *s)
1623 {
1624         struct nfs_server *server = NFS_SB(s);
1625
1626         kill_anon_super(s);
1627
1628         if (!IS_ERR(server->client))
1629                 rpc_shutdown_client(server->client);
1630         if (!IS_ERR(server->client_sys))
1631                 rpc_shutdown_client(server->client_sys);
1632         if (!IS_ERR(server->client_acl))
1633                 rpc_shutdown_client(server->client_acl);
1634
1635         if (!(server->flags & NFS_MOUNT_NONLM))
1636                 lockd_down();   /* release rpc.lockd */
1637
1638         rpciod_down();          /* release rpciod */
1639
1640         if (server->hostname != NULL)
1641                 kfree(server->hostname);
1642         kfree(server);
1643 }
1644
1645 static struct file_system_type nfs_fs_type = {
1646         .owner          = THIS_MODULE,
1647         .name           = "nfs",
1648         .get_sb         = nfs_get_sb,
1649         .kill_sb        = nfs_kill_super,
1650         .fs_flags       = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1651 };
1652
1653 #ifdef CONFIG_NFS_V4
1654
1655 static void nfs4_clear_inode(struct inode *);
1656
1657
1658 static struct super_operations nfs4_sops = {
1659         .alloc_inode    = nfs_alloc_inode,
1660         .destroy_inode  = nfs_destroy_inode,
1661         .write_inode    = nfs_write_inode,
1662         .delete_inode   = nfs_delete_inode,
1663         .statfs         = nfs_statfs,
1664         .clear_inode    = nfs4_clear_inode,
1665         .umount_begin   = nfs_umount_begin,
1666         .show_options   = nfs_show_options,
1667 };
1668
1669 /*
1670  * Clean out any remaining NFSv4 state that might be left over due
1671  * to open() calls that passed nfs_atomic_lookup, but failed to call
1672  * nfs_open().
1673  */
1674 static void nfs4_clear_inode(struct inode *inode)
1675 {
1676         struct nfs_inode *nfsi = NFS_I(inode);
1677
1678         /* If we are holding a delegation, return it! */
1679         if (nfsi->delegation != NULL)
1680                 nfs_inode_return_delegation(inode);
1681         /* First call standard NFS clear_inode() code */
1682         nfs_clear_inode(inode);
1683         /* Now clear out any remaining state */
1684         while (!list_empty(&nfsi->open_states)) {
1685                 struct nfs4_state *state;
1686
1687                 state = list_entry(nfsi->open_states.next,
1688                                 struct nfs4_state,
1689                                 inode_states);
1690                 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1691                                 __FUNCTION__,
1692                                 inode->i_sb->s_id,
1693                                 (long long)NFS_FILEID(inode),
1694                                 state);
1695                 BUG_ON(atomic_read(&state->count) != 1);
1696                 nfs4_close_state(state, state->state);
1697         }
1698 }
1699
1700
1701 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1702 {
1703         struct nfs_server *server;
1704         struct nfs4_client *clp = NULL;
1705         struct rpc_xprt *xprt = NULL;
1706         struct rpc_clnt *clnt = NULL;
1707         struct rpc_timeout timeparms;
1708         rpc_authflavor_t authflavour;
1709         int err = -EIO;
1710
1711         sb->s_blocksize_bits = 0;
1712         sb->s_blocksize = 0;
1713         server = NFS_SB(sb);
1714         if (data->rsize != 0)
1715                 server->rsize = nfs_block_size(data->rsize, NULL);
1716         if (data->wsize != 0)
1717                 server->wsize = nfs_block_size(data->wsize, NULL);
1718         server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1719         server->caps = NFS_CAP_ATOMIC_OPEN;
1720
1721         server->acregmin = data->acregmin*HZ;
1722         server->acregmax = data->acregmax*HZ;
1723         server->acdirmin = data->acdirmin*HZ;
1724         server->acdirmax = data->acdirmax*HZ;
1725
1726         server->rpc_ops = &nfs_v4_clientops;
1727
1728         nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1729
1730         clp = nfs4_get_client(&server->addr.sin_addr);
1731         if (!clp) {
1732                 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1733                 return -EIO;
1734         }
1735
1736         /* Now create transport and client */
1737         authflavour = RPC_AUTH_UNIX;
1738         if (data->auth_flavourlen != 0) {
1739                 if (data->auth_flavourlen != 1) {
1740                         dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1741                                         __FUNCTION__, data->auth_flavourlen);
1742                         err = -EINVAL;
1743                         goto out_fail;
1744                 }
1745                 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1746                         err = -EFAULT;
1747                         goto out_fail;
1748                 }
1749         }
1750
1751         down_write(&clp->cl_sem);
1752         if (IS_ERR(clp->cl_rpcclient)) {
1753                 xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
1754                 if (IS_ERR(xprt)) {
1755                         up_write(&clp->cl_sem);
1756                         err = PTR_ERR(xprt);
1757                         dprintk("%s: cannot create RPC transport. Error = %d\n",
1758                                         __FUNCTION__, err);
1759                         goto out_fail;
1760                 }
1761                 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1762                                 server->rpc_ops->version, authflavour);
1763                 if (IS_ERR(clnt)) {
1764                         up_write(&clp->cl_sem);
1765                         err = PTR_ERR(clnt);
1766                         dprintk("%s: cannot create RPC client. Error = %d\n",
1767                                         __FUNCTION__, err);
1768                         goto out_fail;
1769                 }
1770                 clnt->cl_intr     = 1;
1771                 clnt->cl_softrtry = 1;
1772                 clnt->cl_chatty   = 1;
1773                 clp->cl_rpcclient = clnt;
1774                 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
1775                 if (IS_ERR(clp->cl_cred)) {
1776                         up_write(&clp->cl_sem);
1777                         err = PTR_ERR(clp->cl_cred);
1778                         clp->cl_cred = NULL;
1779                         goto out_fail;
1780                 }
1781                 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1782                 nfs_idmap_new(clp);
1783         }
1784         if (list_empty(&clp->cl_superblocks)) {
1785                 err = nfs4_init_client(clp);
1786                 if (err != 0) {
1787                         up_write(&clp->cl_sem);
1788                         goto out_fail;
1789                 }
1790         }
1791         list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1792         clnt = rpc_clone_client(clp->cl_rpcclient);
1793         if (!IS_ERR(clnt))
1794                         server->nfs4_state = clp;
1795         up_write(&clp->cl_sem);
1796         clp = NULL;
1797
1798         if (IS_ERR(clnt)) {
1799                 err = PTR_ERR(clnt);
1800                 dprintk("%s: cannot create RPC client. Error = %d\n",
1801                                 __FUNCTION__, err);
1802                 return err;
1803         }
1804
1805         server->client    = clnt;
1806
1807         if (server->nfs4_state->cl_idmap == NULL) {
1808                 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1809                 return -ENOMEM;
1810         }
1811
1812         if (clnt->cl_auth->au_flavor != authflavour) {
1813                 struct rpc_auth *auth;
1814
1815                 auth = rpcauth_create(authflavour, clnt);
1816                 if (IS_ERR(auth)) {
1817                         dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1818                         return PTR_ERR(auth);
1819                 }
1820         }
1821
1822         sb->s_time_gran = 1;
1823
1824         sb->s_op = &nfs4_sops;
1825         err = nfs_sb_init(sb, authflavour);
1826         if (err == 0)
1827                 return 0;
1828 out_fail:
1829         if (clp)
1830                 nfs4_put_client(clp);
1831         return err;
1832 }
1833
1834 static int nfs4_compare_super(struct super_block *sb, void *data)
1835 {
1836         struct nfs_server *server = data;
1837         struct nfs_server *old = NFS_SB(sb);
1838
1839         if (strcmp(server->hostname, old->hostname) != 0)
1840                 return 0;
1841         if (strcmp(server->mnt_path, old->mnt_path) != 0)
1842                 return 0;
1843         return 1;
1844 }
1845
1846 static void *
1847 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1848 {
1849         void *p = NULL;
1850
1851         if (!src->len)
1852                 return ERR_PTR(-EINVAL);
1853         if (src->len < maxlen)
1854                 maxlen = src->len;
1855         if (dst == NULL) {
1856                 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1857                 if (p == NULL)
1858                         return ERR_PTR(-ENOMEM);
1859         }
1860         if (copy_from_user(dst, src->data, maxlen)) {
1861                 if (p != NULL)
1862                         kfree(p);
1863                 return ERR_PTR(-EFAULT);
1864         }
1865         dst[maxlen] = '\0';
1866         return dst;
1867 }
1868
1869 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1870         int flags, const char *dev_name, void *raw_data)
1871 {
1872         int error;
1873         struct nfs_server *server;
1874         struct super_block *s;
1875         struct nfs4_mount_data *data = raw_data;
1876         void *p;
1877
1878         if (data == NULL) {
1879                 dprintk("%s: missing data argument\n", __FUNCTION__);
1880                 return ERR_PTR(-EINVAL);
1881         }
1882         if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1883                 dprintk("%s: bad mount version\n", __FUNCTION__);
1884                 return ERR_PTR(-EINVAL);
1885         }
1886
1887         server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1888         if (!server)
1889                 return ERR_PTR(-ENOMEM);
1890         memset(server, 0, sizeof(struct nfs_server));
1891         /* Zero out the NFS state stuff */
1892         init_nfsv4_state(server);
1893         server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1894
1895         p = nfs_copy_user_string(NULL, &data->hostname, 256);
1896         if (IS_ERR(p))
1897                 goto out_err;
1898         server->hostname = p;
1899
1900         p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1901         if (IS_ERR(p))
1902                 goto out_err;
1903         server->mnt_path = p;
1904
1905         p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1906                         sizeof(server->ip_addr) - 1);
1907         if (IS_ERR(p))
1908                 goto out_err;
1909
1910         /* We now require that the mount process passes the remote address */
1911         if (data->host_addrlen != sizeof(server->addr)) {
1912                 s = ERR_PTR(-EINVAL);
1913                 goto out_free;
1914         }
1915         if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1916                 s = ERR_PTR(-EFAULT);
1917                 goto out_free;
1918         }
1919         if (server->addr.sin_family != AF_INET ||
1920             server->addr.sin_addr.s_addr == INADDR_ANY) {
1921                 dprintk("%s: mount program didn't pass remote IP address!\n",
1922                                 __FUNCTION__);
1923                 s = ERR_PTR(-EINVAL);
1924                 goto out_free;
1925         }
1926
1927         /* Fire up rpciod if not yet running */
1928         s = ERR_PTR(rpciod_up());
1929         if (IS_ERR(s)) {
1930                 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1931                                 __FUNCTION__, PTR_ERR(s));
1932                 goto out_free;
1933         }
1934
1935         s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1936
1937         if (IS_ERR(s) || s->s_root)
1938                 goto out_free;
1939
1940         s->s_flags = flags;
1941
1942         error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1943         if (error) {
1944                 up_write(&s->s_umount);
1945                 deactivate_super(s);
1946                 return ERR_PTR(error);
1947         }
1948         s->s_flags |= MS_ACTIVE;
1949         return s;
1950 out_err:
1951         s = (struct super_block *)p;
1952 out_free:
1953         if (server->mnt_path)
1954                 kfree(server->mnt_path);
1955         if (server->hostname)
1956                 kfree(server->hostname);
1957         kfree(server);
1958         return s;
1959 }
1960
1961 static void nfs4_kill_super(struct super_block *sb)
1962 {
1963         struct nfs_server *server = NFS_SB(sb);
1964
1965         nfs_return_all_delegations(sb);
1966         kill_anon_super(sb);
1967
1968         nfs4_renewd_prepare_shutdown(server);
1969
1970         if (server->client != NULL && !IS_ERR(server->client))
1971                 rpc_shutdown_client(server->client);
1972         rpciod_down();          /* release rpciod */
1973
1974         destroy_nfsv4_state(server);
1975
1976         if (server->hostname != NULL)
1977                 kfree(server->hostname);
1978         kfree(server);
1979 }
1980
1981 static struct file_system_type nfs4_fs_type = {
1982         .owner          = THIS_MODULE,
1983         .name           = "nfs4",
1984         .get_sb         = nfs4_get_sb,
1985         .kill_sb        = nfs4_kill_super,
1986         .fs_flags       = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1987 };
1988
1989 #define nfs4_init_once(nfsi) \
1990         do { \
1991                 INIT_LIST_HEAD(&(nfsi)->open_states); \
1992                 nfsi->delegation = NULL; \
1993                 nfsi->delegation_state = 0; \
1994                 init_rwsem(&nfsi->rwsem); \
1995         } while(0)
1996 #define register_nfs4fs() register_filesystem(&nfs4_fs_type)
1997 #define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
1998 #else
1999 #define nfs4_init_once(nfsi) \
2000         do { } while (0)
2001 #define register_nfs4fs() (0)
2002 #define unregister_nfs4fs()
2003 #endif
2004
2005 extern int nfs_init_nfspagecache(void);
2006 extern void nfs_destroy_nfspagecache(void);
2007 extern int nfs_init_readpagecache(void);
2008 extern void nfs_destroy_readpagecache(void);
2009 extern int nfs_init_writepagecache(void);
2010 extern void nfs_destroy_writepagecache(void);
2011 #ifdef CONFIG_NFS_DIRECTIO
2012 extern int nfs_init_directcache(void);
2013 extern void nfs_destroy_directcache(void);
2014 #endif
2015
2016 static kmem_cache_t * nfs_inode_cachep;
2017
2018 static struct inode *nfs_alloc_inode(struct super_block *sb)
2019 {
2020         struct nfs_inode *nfsi;
2021         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2022         if (!nfsi)
2023                 return NULL;
2024         nfsi->flags = 0UL;
2025         nfsi->cache_validity = 0UL;
2026 #ifdef CONFIG_NFS_V3_ACL
2027         nfsi->acl_access = ERR_PTR(-EAGAIN);
2028         nfsi->acl_default = ERR_PTR(-EAGAIN);
2029 #endif
2030 #ifdef CONFIG_NFS_V4
2031         nfsi->nfs4_acl = NULL;
2032 #endif /* CONFIG_NFS_V4 */
2033         return &nfsi->vfs_inode;
2034 }
2035
2036 static void nfs_destroy_inode(struct inode *inode)
2037 {
2038         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2039 }
2040
2041 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2042 {
2043         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2044
2045         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2046             SLAB_CTOR_CONSTRUCTOR) {
2047                 inode_init_once(&nfsi->vfs_inode);
2048                 spin_lock_init(&nfsi->req_lock);
2049                 INIT_LIST_HEAD(&nfsi->dirty);
2050                 INIT_LIST_HEAD(&nfsi->commit);
2051                 INIT_LIST_HEAD(&nfsi->open_files);
2052                 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2053                 atomic_set(&nfsi->data_updates, 0);
2054                 nfsi->ndirty = 0;
2055                 nfsi->ncommit = 0;
2056                 nfsi->npages = 0;
2057                 nfs4_init_once(nfsi);
2058         }
2059 }
2060
2061 static int nfs_init_inodecache(void)
2062 {
2063         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2064                                              sizeof(struct nfs_inode),
2065                                              0, SLAB_RECLAIM_ACCOUNT,
2066                                              init_once, NULL);
2067         if (nfs_inode_cachep == NULL)
2068                 return -ENOMEM;
2069
2070         return 0;
2071 }
2072
2073 static void nfs_destroy_inodecache(void)
2074 {
2075         if (kmem_cache_destroy(nfs_inode_cachep))
2076                 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2077 }
2078
2079 /*
2080  * Initialize NFS
2081  */
2082 static int __init init_nfs_fs(void)
2083 {
2084         int err;
2085
2086         err = nfs_init_nfspagecache();
2087         if (err)
2088                 goto out4;
2089
2090         err = nfs_init_inodecache();
2091         if (err)
2092                 goto out3;
2093
2094         err = nfs_init_readpagecache();
2095         if (err)
2096                 goto out2;
2097
2098         err = nfs_init_writepagecache();
2099         if (err)
2100                 goto out1;
2101
2102 #ifdef CONFIG_NFS_DIRECTIO
2103         err = nfs_init_directcache();
2104         if (err)
2105                 goto out0;
2106 #endif
2107
2108 #ifdef CONFIG_PROC_FS
2109         rpc_proc_register(&nfs_rpcstat);
2110 #endif
2111         err = register_filesystem(&nfs_fs_type);
2112         if (err)
2113                 goto out;
2114         if ((err = register_nfs4fs()) != 0)
2115                 goto out;
2116         return 0;
2117 out:
2118 #ifdef CONFIG_PROC_FS
2119         rpc_proc_unregister("nfs");
2120 #endif
2121         nfs_destroy_writepagecache();
2122 #ifdef CONFIG_NFS_DIRECTIO
2123 out0:
2124         nfs_destroy_directcache();
2125 #endif
2126 out1:
2127         nfs_destroy_readpagecache();
2128 out2:
2129         nfs_destroy_inodecache();
2130 out3:
2131         nfs_destroy_nfspagecache();
2132 out4:
2133         return err;
2134 }
2135
2136 static void __exit exit_nfs_fs(void)
2137 {
2138 #ifdef CONFIG_NFS_DIRECTIO
2139         nfs_destroy_directcache();
2140 #endif
2141         nfs_destroy_writepagecache();
2142         nfs_destroy_readpagecache();
2143         nfs_destroy_inodecache();
2144         nfs_destroy_nfspagecache();
2145 #ifdef CONFIG_PROC_FS
2146         rpc_proc_unregister("nfs");
2147 #endif
2148         unregister_filesystem(&nfs_fs_type);
2149         unregister_nfs4fs();
2150 }
2151
2152 /* Not quite true; I just maintain it */
2153 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2154 MODULE_LICENSE("GPL");
2155
2156 module_init(init_nfs_fs)
2157 module_exit(exit_nfs_fs)