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@lxorguk.ukuu.org.uk>, 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/module.h>
  17 #include <linux/init.h>
  18 #include <linux/sched.h>
  19 #include <linux/time.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mm.h>
  22 #include <linux/string.h>
  23 #include <linux/stat.h>
  24 #include <linux/errno.h>
  25 #include <linux/unistd.h>
  26 #include <linux/sunrpc/clnt.h>
  27 #include <linux/sunrpc/stats.h>
  28 #include <linux/sunrpc/metrics.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/seq_file.h>
  34 #include <linux/mount.h>
  35 #include <linux/nfs_idmap.h>
  36 #include <linux/vfs.h>
  37 #include <linux/inet.h>
  38 #include <linux/nfs_xdr.h>
  39 #include <linux/slab.h>
  40 #include <linux/compat.h>
  41 #include <linux/freezer.h>
  42 #include <linux/crc32.h>
  43
  44 #include <asm/uaccess.h>
  45
  46 #include "nfs4_fs.h"
  47 #include "callback.h"
  48 #include "delegation.h"
  49 #include "iostat.h"
  50 #include "internal.h"
  51 #include "fscache.h"
  52 #include "dns_resolve.h"
  53 #include "pnfs.h"
  54 #include "netns.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_VFS
  57
  58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
  59
  60 /* Default is to see 64-bit inode numbers */
  61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
  62
  63 static void nfs_invalidate_inode(struct inode *);
  64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
  65
  66 static struct kmem_cache * nfs_inode_cachep;
  67
  68 static inline unsigned long
  69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
  70 {
  71         return nfs_fileid_to_ino_t(fattr->fileid);
  72 }
  73
  74 /**
  75  * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
  76  * @word: long word containing the bit lock
  77  */
  78 int nfs_wait_bit_killable(void *word)
  79 {
  80         if (fatal_signal_pending(current))
  81                 return -ERESTARTSYS;
  82         freezable_schedule();
  83         return 0;
  84 }
  85
  86 /**
  87  * nfs_compat_user_ino64 - returns the user-visible inode number
  88  * @fileid: 64-bit fileid
  89  *
  90  * This function returns a 32-bit inode number if the boot parameter
  91  * nfs.enable_ino64 is zero.
  92  */
  93 u64 nfs_compat_user_ino64(u64 fileid)
  94 {
  95 #ifdef CONFIG_COMPAT
  96         compat_ulong_t ino;
  97 #else
  98         unsigned long ino;
  99 #endif
 100
 101         if (enable_ino64)
 102                 return fileid;
 103         ino = fileid;
 104         if (sizeof(ino) < sizeof(fileid))
 105                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
 106         return ino;
 107 }
 108
 109 static void nfs_clear_inode(struct inode *inode)
 110 {
 111         /*
 112          * The following should never happen...
 113          */
 114         BUG_ON(nfs_have_writebacks(inode));
 115         BUG_ON(!list_empty(&NFS_I(inode)->open_files));
 116         nfs_zap_acl_cache(inode);
 117         nfs_access_zap_cache(inode);
 118         nfs_fscache_release_inode_cookie(inode);
 119 }
 120
 121 void nfs_evict_inode(struct inode *inode)
 122 {
 123         truncate_inode_pages(&inode->i_data, 0);
 124         clear_inode(inode);
 125         nfs_clear_inode(inode);
 126 }
 127
 128 /**
 129  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
 130  */
 131 int nfs_sync_mapping(struct address_space *mapping)
 132 {
 133         int ret = 0;
 134
 135         if (mapping->nrpages != 0) {
 136                 unmap_mapping_range(mapping, 0, 0, 0);
 137                 ret = nfs_wb_all(mapping->host);
 138         }
 139         return ret;
 140 }
 141
 142 /*
 143  * Invalidate the local caches
 144  */
 145 static void nfs_zap_caches_locked(struct inode *inode)
 146 {
 147         struct nfs_inode *nfsi = NFS_I(inode);
 148         int mode = inode->i_mode;
 149
 150         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 151
 152         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 153         nfsi->attrtimeo_timestamp = jiffies;
 154
 155         memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
 156         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
 157                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
 158         else
 159                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
 160 }
 161
 162 void nfs_zap_caches(struct inode *inode)
 163 {
 164         spin_lock(&inode->i_lock);
 165         nfs_zap_caches_locked(inode);
 166         spin_unlock(&inode->i_lock);
 167 }
 168
 169 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
 170 {
 171         if (mapping->nrpages != 0) {
 172                 spin_lock(&inode->i_lock);
 173                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
 174                 spin_unlock(&inode->i_lock);
 175         }
 176 }
 177
 178 void nfs_zap_acl_cache(struct inode *inode)
 179 {
 180         void (*clear_acl_cache)(struct inode *);
 181
 182         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
 183         if (clear_acl_cache != NULL)
 184                 clear_acl_cache(inode);
 185         spin_lock(&inode->i_lock);
 186         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
 187         spin_unlock(&inode->i_lock);
 188 }
 189
 190 void nfs_invalidate_atime(struct inode *inode)
 191 {
 192         spin_lock(&inode->i_lock);
 193         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
 194         spin_unlock(&inode->i_lock);
 195 }
 196
 197 /*
 198  * Invalidate, but do not unhash, the inode.
 199  * NB: must be called with inode->i_lock held!
 200  */
 201 static void nfs_invalidate_inode(struct inode *inode)
 202 {
 203         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 204         nfs_zap_caches_locked(inode);
 205 }
 206
 207 struct nfs_find_desc {
 208         struct nfs_fh           *fh;
 209         struct nfs_fattr        *fattr;
 210 };
 211
 212 /*
 213  * In NFSv3 we can have 64bit inode numbers. In order to support
 214  * this, and re-exported directories (also seen in NFSv2)
 215  * we are forced to allow 2 different inodes to have the same
 216  * i_ino.
 217  */
 218 static int
 219 nfs_find_actor(struct inode *inode, void *opaque)
 220 {
 221         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
 222         struct nfs_fh           *fh = desc->fh;
 223         struct nfs_fattr        *fattr = desc->fattr;
 224
 225         if (NFS_FILEID(inode) != fattr->fileid)
 226                 return 0;
 227         if (nfs_compare_fh(NFS_FH(inode), fh))
 228                 return 0;
 229         if (is_bad_inode(inode) || NFS_STALE(inode))
 230                 return 0;
 231         return 1;
 232 }
 233
 234 static int
 235 nfs_init_locked(struct inode *inode, void *opaque)
 236 {
 237         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
 238         struct nfs_fattr        *fattr = desc->fattr;
 239
 240         set_nfs_fileid(inode, fattr->fileid);
 241         nfs_copy_fh(NFS_FH(inode), desc->fh);
 242         return 0;
 243 }
 244
 245 /*
 246  * This is our front-end to iget that looks up inodes by file handle
 247  * instead of inode number.
 248  */
 249 struct inode *
 250 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
 251 {
 252         struct nfs_find_desc desc = {
 253                 .fh     = fh,
 254                 .fattr  = fattr
 255         };
 256         struct inode *inode = ERR_PTR(-ENOENT);
 257         unsigned long hash;
 258
 259         nfs_attr_check_mountpoint(sb, fattr);
 260
 261         if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
 262             !nfs_attr_use_mounted_on_fileid(fattr))
 263                 goto out_no_inode;
 264         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
 265                 goto out_no_inode;
 266
 267         hash = nfs_fattr_to_ino_t(fattr);
 268
 269         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
 270         if (inode == NULL) {
 271                 inode = ERR_PTR(-ENOMEM);
 272                 goto out_no_inode;
 273         }
 274
 275         if (inode->i_state & I_NEW) {
 276                 struct nfs_inode *nfsi = NFS_I(inode);
 277                 unsigned long now = jiffies;
 278
 279                 /* We set i_ino for the few things that still rely on it,
 280                  * such as stat(2) */
 281                 inode->i_ino = hash;
 282
 283                 /* We can't support update_atime(), since the server will reset it */
 284                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
 285                 inode->i_mode = fattr->mode;
 286                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
 287                                 && nfs_server_capable(inode, NFS_CAP_MODE))
 288                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 289                 /* Why so? Because we want revalidate for devices/FIFOs, and
 290                  * that's precisely what we have in nfs_file_inode_operations.
 291                  */
 292                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
 293                 if (S_ISREG(inode->i_mode)) {
 294                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
 295                         inode->i_data.a_ops = &nfs_file_aops;
 296                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
 297                 } else if (S_ISDIR(inode->i_mode)) {
 298                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
 299                         inode->i_fop = &nfs_dir_operations;
 300                         inode->i_data.a_ops = &nfs_dir_aops;
 301                         /* Deal with crossing mountpoints */
 302                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
 303                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
 304                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
 305                                         inode->i_op = &nfs_referral_inode_operations;
 306                                 else
 307                                         inode->i_op = &nfs_mountpoint_inode_operations;
 308                                 inode->i_fop = NULL;
 309                                 inode->i_flags |= S_AUTOMOUNT;
 310                         }
 311                 } else if (S_ISLNK(inode->i_mode))
 312                         inode->i_op = &nfs_symlink_inode_operations;
 313                 else
 314                         init_special_inode(inode, inode->i_mode, fattr->rdev);
 315
 316                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
 317                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
 318                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
 319                 inode->i_version = 0;
 320                 inode->i_size = 0;
 321                 clear_nlink(inode);
 322                 inode->i_uid = -2;
 323                 inode->i_gid = -2;
 324                 inode->i_blocks = 0;
 325                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 326                 nfsi->write_io = 0;
 327                 nfsi->read_io = 0;
 328
 329                 nfsi->read_cache_jiffies = fattr->time_start;
 330                 nfsi->attr_gencount = fattr->gencount;
 331                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
 332                         inode->i_atime = fattr->atime;
 333                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
 334                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 335                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
 336                         inode->i_mtime = fattr->mtime;
 337                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
 338                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 339                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 340                         inode->i_ctime = fattr->ctime;
 341                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
 342                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 343                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
 344                         inode->i_version = fattr->change_attr;
 345                 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
 346                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 347                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
 348                         inode->i_size = nfs_size_to_loff_t(fattr->size);
 349                 else
 350                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR
 351                                 | NFS_INO_REVAL_PAGECACHE;
 352                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
 353                         set_nlink(inode, fattr->nlink);
 354                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
 355                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 356                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
 357                         inode->i_uid = fattr->uid;
 358                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
 359                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 360                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
 361                         inode->i_gid = fattr->gid;
 362                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
 363                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 364                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
 365                         inode->i_blocks = fattr->du.nfs2.blocks;
 366                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
 367                         /*
 368                          * report the blocks in 512byte units
 369                          */
 370                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
 371                 }
 372                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 373                 nfsi->attrtimeo_timestamp = now;
 374                 nfsi->access_cache = RB_ROOT;
 375
 376                 nfs_fscache_init_inode_cookie(inode);
 377
 378                 unlock_new_inode(inode);
 379         } else
 380                 nfs_refresh_inode(inode, fattr);
 381         dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
 382                 inode->i_sb->s_id,
 383                 (long long)NFS_FILEID(inode),
 384                 nfs_display_fhandle_hash(fh),
 385                 atomic_read(&inode->i_count));
 386
 387 out:
 388         return inode;
 389
 390 out_no_inode:
 391         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
 392         goto out;
 393 }
 394
 395 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
 396
 397 int
 398 nfs_setattr(struct dentry *dentry, struct iattr *attr)
 399 {
 400         struct inode *inode = dentry->d_inode;
 401         struct nfs_fattr *fattr;
 402         int error = -ENOMEM;
 403
 404         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
 405
 406         /* skip mode change if it's just for clearing setuid/setgid */
 407         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 408                 attr->ia_valid &= ~ATTR_MODE;
 409
 410         if (attr->ia_valid & ATTR_SIZE) {
 411                 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
 412                         attr->ia_valid &= ~ATTR_SIZE;
 413         }
 414
 415         /* Optimization: if the end result is no change, don't RPC */
 416         attr->ia_valid &= NFS_VALID_ATTRS;
 417         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
 418                 return 0;
 419
 420         /* Write all dirty data */
 421         if (S_ISREG(inode->i_mode))
 422                 nfs_wb_all(inode);
 423
 424         fattr = nfs_alloc_fattr();
 425         if (fattr == NULL)
 426                 goto out;
 427         /*
 428          * Return any delegations if we're going to change ACLs
 429          */
 430         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
 431                 nfs_inode_return_delegation(inode);
 432         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
 433         if (error == 0)
 434                 nfs_refresh_inode(inode, fattr);
 435         nfs_free_fattr(fattr);
 436 out:
 437         return error;
 438 }
 439
 440 /**
 441  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
 442  * @inode: inode of the file used
 443  * @offset: file offset to start truncating
 444  *
 445  * This is a copy of the common vmtruncate, but with the locking
 446  * corrected to take into account the fact that NFS requires
 447  * inode->i_size to be updated under the inode->i_lock.
 448  */
 449 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
 450 {
 451         loff_t oldsize;
 452         int err;
 453
 454         err = inode_newsize_ok(inode, offset);
 455         if (err)
 456                 goto out;
 457
 458         spin_lock(&inode->i_lock);
 459         oldsize = inode->i_size;
 460         i_size_write(inode, offset);
 461         spin_unlock(&inode->i_lock);
 462
 463         truncate_pagecache(inode, oldsize, offset);
 464 out:
 465         return err;
 466 }
 467
 468 /**
 469  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 470  * @inode: pointer to struct inode
 471  * @attr: pointer to struct iattr
 472  *
 473  * Note: we do this in the *proc.c in order to ensure that
 474  *       it works for things like exclusive creates too.
 475  */
 476 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
 477 {
 478         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
 479                 spin_lock(&inode->i_lock);
 480                 if ((attr->ia_valid & ATTR_MODE) != 0) {
 481                         int mode = attr->ia_mode & S_IALLUGO;
 482                         mode |= inode->i_mode & ~S_IALLUGO;
 483                         inode->i_mode = mode;
 484                 }
 485                 if ((attr->ia_valid & ATTR_UID) != 0)
 486                         inode->i_uid = attr->ia_uid;
 487                 if ((attr->ia_valid & ATTR_GID) != 0)
 488                         inode->i_gid = attr->ia_gid;
 489                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
 490                 spin_unlock(&inode->i_lock);
 491         }
 492         if ((attr->ia_valid & ATTR_SIZE) != 0) {
 493                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
 494                 nfs_vmtruncate(inode, attr->ia_size);
 495         }
 496 }
 497
 498 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 499 {
 500         struct inode *inode = dentry->d_inode;
 501         int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
 502         int err;
 503
 504         /* Flush out writes to the server in order to update c/mtime.  */
 505         if (S_ISREG(inode->i_mode)) {
 506                 err = filemap_write_and_wait(inode->i_mapping);
 507                 if (err)
 508                         goto out;
 509         }
 510
 511         /*
 512          * We may force a getattr if the user cares about atime.
 513          *
 514          * Note that we only have to check the vfsmount flags here:
 515          *  - NFS always sets S_NOATIME by so checking it would give a
 516          *    bogus result
 517          *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
 518          *    no point in checking those.
 519          */
 520         if ((mnt->mnt_flags & MNT_NOATIME) ||
 521             ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 522                 need_atime = 0;
 523
 524         if (need_atime)
 525                 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
 526         else
 527                 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
 528         if (!err) {
 529                 generic_fillattr(inode, stat);
 530                 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
 531         }
 532 out:
 533         return err;
 534 }
 535
 536 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
 537 {
 538         atomic_set(&l_ctx->count, 1);
 539         l_ctx->lockowner = current->files;
 540         l_ctx->pid = current->tgid;
 541         INIT_LIST_HEAD(&l_ctx->list);
 542 }
 543
 544 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
 545 {
 546         struct nfs_lock_context *pos;
 547
 548         list_for_each_entry(pos, &ctx->lock_context.list, list) {
 549                 if (pos->lockowner != current->files)
 550                         continue;
 551                 if (pos->pid != current->tgid)
 552                         continue;
 553                 atomic_inc(&pos->count);
 554                 return pos;
 555         }
 556         return NULL;
 557 }
 558
 559 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
 560 {
 561         struct nfs_lock_context *res, *new = NULL;
 562         struct inode *inode = ctx->dentry->d_inode;
 563
 564         spin_lock(&inode->i_lock);
 565         res = __nfs_find_lock_context(ctx);
 566         if (res == NULL) {
 567                 spin_unlock(&inode->i_lock);
 568                 new = kmalloc(sizeof(*new), GFP_KERNEL);
 569                 if (new == NULL)
 570                         return NULL;
 571                 nfs_init_lock_context(new);
 572                 spin_lock(&inode->i_lock);
 573                 res = __nfs_find_lock_context(ctx);
 574                 if (res == NULL) {
 575                         list_add_tail(&new->list, &ctx->lock_context.list);
 576                         new->open_context = ctx;
 577                         res = new;
 578                         new = NULL;
 579                 }
 580         }
 581         spin_unlock(&inode->i_lock);
 582         kfree(new);
 583         return res;
 584 }
 585
 586 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
 587 {
 588         struct nfs_open_context *ctx = l_ctx->open_context;
 589         struct inode *inode = ctx->dentry->d_inode;
 590
 591         if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
 592                 return;
 593         list_del(&l_ctx->list);
 594         spin_unlock(&inode->i_lock);
 595         kfree(l_ctx);
 596 }
 597
 598 /**
 599  * nfs_close_context - Common close_context() routine NFSv2/v3
 600  * @ctx: pointer to context
 601  * @is_sync: is this a synchronous close
 602  *
 603  * always ensure that the attributes are up to date if we're mounted
 604  * with close-to-open semantics
 605  */
 606 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
 607 {
 608         struct inode *inode;
 609         struct nfs_server *server;
 610
 611         if (!(ctx->mode & FMODE_WRITE))
 612                 return;
 613         if (!is_sync)
 614                 return;
 615         inode = ctx->dentry->d_inode;
 616         if (!list_empty(&NFS_I(inode)->open_files))
 617                 return;
 618         server = NFS_SERVER(inode);
 619         if (server->flags & NFS_MOUNT_NOCTO)
 620                 return;
 621         nfs_revalidate_inode(server, inode);
 622 }
 623
 624 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
 625 {
 626         struct nfs_open_context *ctx;
 627         struct rpc_cred *cred = rpc_lookup_cred();
 628         if (IS_ERR(cred))
 629                 return ERR_CAST(cred);
 630
 631         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 632         if (!ctx) {
 633                 put_rpccred(cred);
 634                 return ERR_PTR(-ENOMEM);
 635         }
 636         nfs_sb_active(dentry->d_sb);
 637         ctx->dentry = dget(dentry);
 638         ctx->cred = cred;
 639         ctx->state = NULL;
 640         ctx->mode = f_mode;
 641         ctx->flags = 0;
 642         ctx->error = 0;
 643         nfs_init_lock_context(&ctx->lock_context);
 644         ctx->lock_context.open_context = ctx;
 645         INIT_LIST_HEAD(&ctx->list);
 646         ctx->mdsthreshold = NULL;
 647         return ctx;
 648 }
 649
 650 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
 651 {
 652         if (ctx != NULL)
 653                 atomic_inc(&ctx->lock_context.count);
 654         return ctx;
 655 }
 656
 657 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
 658 {
 659         struct inode *inode = ctx->dentry->d_inode;
 660         struct super_block *sb = ctx->dentry->d_sb;
 661
 662         if (!list_empty(&ctx->list)) {
 663                 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
 664                         return;
 665                 list_del(&ctx->list);
 666                 spin_unlock(&inode->i_lock);
 667         } else if (!atomic_dec_and_test(&ctx->lock_context.count))
 668                 return;
 669         if (inode != NULL)
 670                 NFS_PROTO(inode)->close_context(ctx, is_sync);
 671         if (ctx->cred != NULL)
 672                 put_rpccred(ctx->cred);
 673         dput(ctx->dentry);
 674         nfs_sb_deactive(sb);
 675         kfree(ctx->mdsthreshold);
 676         kfree(ctx);
 677 }
 678
 679 void put_nfs_open_context(struct nfs_open_context *ctx)
 680 {
 681         __put_nfs_open_context(ctx, 0);
 682 }
 683
 684 /*
 685  * Ensure that mmap has a recent RPC credential for use when writing out
 686  * shared pages
 687  */
 688 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
 689 {
 690         struct inode *inode = filp->f_path.dentry->d_inode;
 691         struct nfs_inode *nfsi = NFS_I(inode);
 692
 693         filp->private_data = get_nfs_open_context(ctx);
 694         spin_lock(&inode->i_lock);
 695         list_add(&ctx->list, &nfsi->open_files);
 696         spin_unlock(&inode->i_lock);
 697 }
 698
 699 /*
 700  * Given an inode, search for an open context with the desired characteristics
 701  */
 702 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
 703 {
 704         struct nfs_inode *nfsi = NFS_I(inode);
 705         struct nfs_open_context *pos, *ctx = NULL;
 706
 707         spin_lock(&inode->i_lock);
 708         list_for_each_entry(pos, &nfsi->open_files, list) {
 709                 if (cred != NULL && pos->cred != cred)
 710                         continue;
 711                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
 712                         continue;
 713                 ctx = get_nfs_open_context(pos);
 714                 break;
 715         }
 716         spin_unlock(&inode->i_lock);
 717         return ctx;
 718 }
 719
 720 static void nfs_file_clear_open_context(struct file *filp)
 721 {
 722         struct inode *inode = filp->f_path.dentry->d_inode;
 723         struct nfs_open_context *ctx = nfs_file_open_context(filp);
 724
 725         if (ctx) {
 726                 filp->private_data = NULL;
 727                 spin_lock(&inode->i_lock);
 728                 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
 729                 spin_unlock(&inode->i_lock);
 730                 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
 731         }
 732 }
 733
 734 /*
 735  * These allocate and release file read/write context information.
 736  */
 737 int nfs_open(struct inode *inode, struct file *filp)
 738 {
 739         struct nfs_open_context *ctx;
 740
 741         ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
 742         if (IS_ERR(ctx))
 743                 return PTR_ERR(ctx);
 744         nfs_file_set_open_context(filp, ctx);
 745         put_nfs_open_context(ctx);
 746         nfs_fscache_set_inode_cookie(inode, filp);
 747         return 0;
 748 }
 749
 750 int nfs_release(struct inode *inode, struct file *filp)
 751 {
 752         nfs_file_clear_open_context(filp);
 753         return 0;
 754 }
 755
 756 /*
 757  * This function is called whenever some part of NFS notices that
 758  * the cached attributes have to be refreshed.
 759  */
 760 int
 761 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 762 {
 763         int              status = -ESTALE;
 764         struct nfs_fattr *fattr = NULL;
 765         struct nfs_inode *nfsi = NFS_I(inode);
 766
 767         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
 768                 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
 769
 770         if (is_bad_inode(inode))
 771                 goto out;
 772         if (NFS_STALE(inode))
 773                 goto out;
 774
 775         status = -ENOMEM;
 776         fattr = nfs_alloc_fattr();
 777         if (fattr == NULL)
 778                 goto out;
 779
 780         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
 781         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
 782         if (status != 0) {
 783                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
 784                          inode->i_sb->s_id,
 785                          (long long)NFS_FILEID(inode), status);
 786                 if (status == -ESTALE) {
 787                         nfs_zap_caches(inode);
 788                         if (!S_ISDIR(inode->i_mode))
 789                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 790                 }
 791                 goto out;
 792         }
 793
 794         status = nfs_refresh_inode(inode, fattr);
 795         if (status) {
 796                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
 797                          inode->i_sb->s_id,
 798                          (long long)NFS_FILEID(inode), status);
 799                 goto out;
 800         }
 801
 802         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
 803                 nfs_zap_acl_cache(inode);
 804
 805         dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
 806                 inode->i_sb->s_id,
 807                 (long long)NFS_FILEID(inode));
 808
 809  out:
 810         nfs_free_fattr(fattr);
 811         return status;
 812 }
 813
 814 int nfs_attribute_timeout(struct inode *inode)
 815 {
 816         struct nfs_inode *nfsi = NFS_I(inode);
 817
 818         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
 819 }
 820
 821 static int nfs_attribute_cache_expired(struct inode *inode)
 822 {
 823         if (nfs_have_delegated_attributes(inode))
 824                 return 0;
 825         return nfs_attribute_timeout(inode);
 826 }
 827
 828 /**
 829  * nfs_revalidate_inode - Revalidate the inode attributes
 830  * @server - pointer to nfs_server struct
 831  * @inode - pointer to inode struct
 832  *
 833  * Updates inode attribute information by retrieving the data from the server.
 834  */
 835 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 836 {
 837         if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
 838                         && !nfs_attribute_cache_expired(inode))
 839                 return NFS_STALE(inode) ? -ESTALE : 0;
 840         return __nfs_revalidate_inode(server, inode);
 841 }
 842
 843 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
 844 {
 845         struct nfs_inode *nfsi = NFS_I(inode);
 846
 847         if (mapping->nrpages != 0) {
 848                 int ret = invalidate_inode_pages2(mapping);
 849                 if (ret < 0)
 850                         return ret;
 851         }
 852         spin_lock(&inode->i_lock);
 853         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
 854         if (S_ISDIR(inode->i_mode))
 855                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 856         spin_unlock(&inode->i_lock);
 857         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
 858         nfs_fscache_reset_inode_cookie(inode);
 859         dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
 860                         inode->i_sb->s_id, (long long)NFS_FILEID(inode));
 861         return 0;
 862 }
 863
 864 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
 865 {
 866         if (nfs_have_delegated_attributes(inode))
 867                 return false;
 868         return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
 869                 || nfs_attribute_timeout(inode)
 870                 || NFS_STALE(inode);
 871 }
 872
 873 /**
 874  * nfs_revalidate_mapping - Revalidate the pagecache
 875  * @inode - pointer to host inode
 876  * @mapping - pointer to mapping
 877  */
 878 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
 879 {
 880         struct nfs_inode *nfsi = NFS_I(inode);
 881         int ret = 0;
 882
 883         if (nfs_mapping_need_revalidate_inode(inode)) {
 884                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
 885                 if (ret < 0)
 886                         goto out;
 887         }
 888         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
 889                 ret = nfs_invalidate_mapping(inode, mapping);
 890 out:
 891         return ret;
 892 }
 893
 894 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 895 {
 896         struct nfs_inode *nfsi = NFS_I(inode);
 897         unsigned long ret = 0;
 898
 899         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
 900                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
 901                         && inode->i_version == fattr->pre_change_attr) {
 902                 inode->i_version = fattr->change_attr;
 903                 if (S_ISDIR(inode->i_mode))
 904                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 905                 ret |= NFS_INO_INVALID_ATTR;
 906         }
 907         /* If we have atomic WCC data, we may update some attributes */
 908         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
 909                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
 910                         && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
 911                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
 912                 ret |= NFS_INO_INVALID_ATTR;
 913         }
 914
 915         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
 916                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
 917                         && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
 918                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
 919                 if (S_ISDIR(inode->i_mode))
 920                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 921                 ret |= NFS_INO_INVALID_ATTR;
 922         }
 923         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
 924                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
 925                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
 926                         && nfsi->npages == 0) {
 927                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
 928                 ret |= NFS_INO_INVALID_ATTR;
 929         }
 930         return ret;
 931 }
 932
 933 /**
 934  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
 935  * @inode - pointer to inode
 936  * @fattr - updated attributes
 937  *
 938  * Verifies the attribute cache. If we have just changed the attributes,
 939  * so that fattr carries weak cache consistency data, then it may
 940  * also update the ctime/mtime/change_attribute.
 941  */
 942 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
 943 {
 944         struct nfs_inode *nfsi = NFS_I(inode);
 945         loff_t cur_size, new_isize;
 946         unsigned long invalid = 0;
 947
 948
 949         if (nfs_have_delegated_attributes(inode))
 950                 return 0;
 951         /* Has the inode gone and changed behind our back? */
 952         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
 953                 return -EIO;
 954         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
 955                 return -EIO;
 956
 957         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
 958                         inode->i_version != fattr->change_attr)
 959                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 960
 961         /* Verify a few of the more important attributes */
 962         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
 963                 invalid |= NFS_INO_INVALID_ATTR;
 964
 965         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
 966                 cur_size = i_size_read(inode);
 967                 new_isize = nfs_size_to_loff_t(fattr->size);
 968                 if (cur_size != new_isize && nfsi->npages == 0)
 969                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
 970         }
 971
 972         /* Have any file permissions changed? */
 973         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
 974                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
 975         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
 976                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
 977         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
 978                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
 979
 980         /* Has the link count changed? */
 981         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
 982                 invalid |= NFS_INO_INVALID_ATTR;
 983
 984         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
 985                 invalid |= NFS_INO_INVALID_ATIME;
 986
 987         if (invalid != 0)
 988                 nfsi->cache_validity |= invalid;
 989
 990         nfsi->read_cache_jiffies = fattr->time_start;
 991         return 0;
 992 }
 993
 994 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
 995 {
 996         if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
 997                 return 0;
 998         return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
 999 }
1000
1001 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1002 {
1003         if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1004                 return 0;
1005         return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1006 }
1007
1008 static atomic_long_t nfs_attr_generation_counter;
1009
1010 static unsigned long nfs_read_attr_generation_counter(void)
1011 {
1012         return atomic_long_read(&nfs_attr_generation_counter);
1013 }
1014
1015 unsigned long nfs_inc_attr_generation_counter(void)
1016 {
1017         return atomic_long_inc_return(&nfs_attr_generation_counter);
1018 }
1019
1020 void nfs_fattr_init(struct nfs_fattr *fattr)
1021 {
1022         fattr->valid = 0;
1023         fattr->time_start = jiffies;
1024         fattr->gencount = nfs_inc_attr_generation_counter();
1025         fattr->owner_name = NULL;
1026         fattr->group_name = NULL;
1027 }
1028
1029 struct nfs_fattr *nfs_alloc_fattr(void)
1030 {
1031         struct nfs_fattr *fattr;
1032
1033         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1034         if (fattr != NULL)
1035                 nfs_fattr_init(fattr);
1036         return fattr;
1037 }
1038
1039 struct nfs_fh *nfs_alloc_fhandle(void)
1040 {
1041         struct nfs_fh *fh;
1042
1043         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1044         if (fh != NULL)
1045                 fh->size = 0;
1046         return fh;
1047 }
1048
1049 #ifdef NFS_DEBUG
1050 /*
1051  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1052  *                             in the same way that wireshark does
1053  *
1054  * @fh: file handle
1055  *
1056  * For debugging only.
1057  */
1058 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1059 {
1060         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1061          * not on the result */
1062         return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1063 }
1064
1065 /*
1066  * _nfs_display_fhandle - display an NFS file handle on the console
1067  *
1068  * @fh: file handle to display
1069  * @caption: display caption
1070  *
1071  * For debugging only.
1072  */
1073 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1074 {
1075         unsigned short i;
1076
1077         if (fh == NULL || fh->size == 0) {
1078                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1079                 return;
1080         }
1081
1082         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1083                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1084         for (i = 0; i < fh->size; i += 16) {
1085                 __be32 *pos = (__be32 *)&fh->data[i];
1086
1087                 switch ((fh->size - i - 1) >> 2) {
1088                 case 0:
1089                         printk(KERN_DEFAULT " %08x\n",
1090                                 be32_to_cpup(pos));
1091                         break;
1092                 case 1:
1093                         printk(KERN_DEFAULT " %08x %08x\n",
1094                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1095                         break;
1096                 case 2:
1097                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1098                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1099                                 be32_to_cpup(pos + 2));
1100                         break;
1101                 default:
1102                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1103                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1104                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1105                 }
1106         }
1107 }
1108 #endif
1109
1110 /**
1111  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1112  * @inode - pointer to inode
1113  * @fattr - attributes
1114  *
1115  * Attempt to divine whether or not an RPC call reply carrying stale
1116  * attributes got scheduled after another call carrying updated ones.
1117  *
1118  * To do so, the function first assumes that a more recent ctime means
1119  * that the attributes in fattr are newer, however it also attempt to
1120  * catch the case where ctime either didn't change, or went backwards
1121  * (if someone reset the clock on the server) by looking at whether
1122  * or not this RPC call was started after the inode was last updated.
1123  * Note also the check for wraparound of 'attr_gencount'
1124  *
1125  * The function returns 'true' if it thinks the attributes in 'fattr' are
1126  * more recent than the ones cached in the inode.
1127  *
1128  */
1129 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1130 {
1131         const struct nfs_inode *nfsi = NFS_I(inode);
1132
1133         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1134                 nfs_ctime_need_update(inode, fattr) ||
1135                 nfs_size_need_update(inode, fattr) ||
1136                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1137 }
1138
1139 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1140 {
1141         if (nfs_inode_attrs_need_update(inode, fattr))
1142                 return nfs_update_inode(inode, fattr);
1143         return nfs_check_inode_attributes(inode, fattr);
1144 }
1145
1146 /**
1147  * nfs_refresh_inode - try to update the inode attribute cache
1148  * @inode - pointer to inode
1149  * @fattr - updated attributes
1150  *
1151  * Check that an RPC call that returned attributes has not overlapped with
1152  * other recent updates of the inode metadata, then decide whether it is
1153  * safe to do a full update of the inode attributes, or whether just to
1154  * call nfs_check_inode_attributes.
1155  */
1156 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1157 {
1158         int status;
1159
1160         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1161                 return 0;
1162         spin_lock(&inode->i_lock);
1163         status = nfs_refresh_inode_locked(inode, fattr);
1164         spin_unlock(&inode->i_lock);
1165
1166         return status;
1167 }
1168
1169 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1170 {
1171         struct nfs_inode *nfsi = NFS_I(inode);
1172
1173         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1174         if (S_ISDIR(inode->i_mode))
1175                 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1176         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1177                 return 0;
1178         return nfs_refresh_inode_locked(inode, fattr);
1179 }
1180
1181 /**
1182  * nfs_post_op_update_inode - try to update the inode attribute cache
1183  * @inode - pointer to inode
1184  * @fattr - updated attributes
1185  *
1186  * After an operation that has changed the inode metadata, mark the
1187  * attribute cache as being invalid, then try to update it.
1188  *
1189  * NB: if the server didn't return any post op attributes, this
1190  * function will force the retrieval of attributes before the next
1191  * NFS request.  Thus it should be used only for operations that
1192  * are expected to change one or more attributes, to avoid
1193  * unnecessary NFS requests and trips through nfs_update_inode().
1194  */
1195 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1196 {
1197         int status;
1198
1199         spin_lock(&inode->i_lock);
1200         status = nfs_post_op_update_inode_locked(inode, fattr);
1201         spin_unlock(&inode->i_lock);
1202         return status;
1203 }
1204
1205 /**
1206  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1207  * @inode - pointer to inode
1208  * @fattr - updated attributes
1209  *
1210  * After an operation that has changed the inode metadata, mark the
1211  * attribute cache as being invalid, then try to update it. Fake up
1212  * weak cache consistency data, if none exist.
1213  *
1214  * This function is mainly designed to be used by the ->write_done() functions.
1215  */
1216 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1217 {
1218         int status;
1219
1220         spin_lock(&inode->i_lock);
1221         /* Don't do a WCC update if these attributes are already stale */
1222         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1223                         !nfs_inode_attrs_need_update(inode, fattr)) {
1224                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1225                                 | NFS_ATTR_FATTR_PRESIZE
1226                                 | NFS_ATTR_FATTR_PREMTIME
1227                                 | NFS_ATTR_FATTR_PRECTIME);
1228                 goto out_noforce;
1229         }
1230         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1231                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1232                 fattr->pre_change_attr = inode->i_version;
1233                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1234         }
1235         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1236                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1237                 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1238                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1239         }
1240         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1241                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1242                 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1243                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1244         }
1245         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1246                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1247                 fattr->pre_size = i_size_read(inode);
1248                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1249         }
1250 out_noforce:
1251         status = nfs_post_op_update_inode_locked(inode, fattr);
1252         spin_unlock(&inode->i_lock);
1253         return status;
1254 }
1255
1256 /*
1257  * Many nfs protocol calls return the new file attributes after
1258  * an operation.  Here we update the inode to reflect the state
1259  * of the server's inode.
1260  *
1261  * This is a bit tricky because we have to make sure all dirty pages
1262  * have been sent off to the server before calling invalidate_inode_pages.
1263  * To make sure no other process adds more write requests while we try
1264  * our best to flush them, we make them sleep during the attribute refresh.
1265  *
1266  * A very similar scenario holds for the dir cache.
1267  */
1268 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1269 {
1270         struct nfs_server *server;
1271         struct nfs_inode *nfsi = NFS_I(inode);
1272         loff_t cur_isize, new_isize;
1273         unsigned long invalid = 0;
1274         unsigned long now = jiffies;
1275         unsigned long save_cache_validity;
1276
1277         dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1278                         __func__, inode->i_sb->s_id, inode->i_ino,
1279                         nfs_display_fhandle_hash(NFS_FH(inode)),
1280                         atomic_read(&inode->i_count), fattr->valid);
1281
1282         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1283                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1284                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1285                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1286                         inode->i_sb->s_id, (long long)nfsi->fileid,
1287                         (long long)fattr->fileid);
1288                 goto out_err;
1289         }
1290
1291         /*
1292          * Make sure the inode's type hasn't changed.
1293          */
1294         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1295                 /*
1296                 * Big trouble! The inode has become a different object.
1297                 */
1298                 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1299                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1300                 goto out_err;
1301         }
1302
1303         server = NFS_SERVER(inode);
1304         /* Update the fsid? */
1305         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1306                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1307                         !IS_AUTOMOUNT(inode))
1308                 server->fsid = fattr->fsid;
1309
1310         /*
1311          * Update the read time so we don't revalidate too often.
1312          */
1313         nfsi->read_cache_jiffies = fattr->time_start;
1314
1315         save_cache_validity = nfsi->cache_validity;
1316         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1317                         | NFS_INO_INVALID_ATIME
1318                         | NFS_INO_REVAL_FORCED
1319                         | NFS_INO_REVAL_PAGECACHE);
1320
1321         /* Do atomic weak cache consistency updates */
1322         invalid |= nfs_wcc_update_inode(inode, fattr);
1323
1324         /* More cache consistency checks */
1325         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1326                 if (inode->i_version != fattr->change_attr) {
1327                         dprintk("NFS: change_attr change on server for file %s/%ld\n",
1328                                         inode->i_sb->s_id, inode->i_ino);
1329                         invalid |= NFS_INO_INVALID_ATTR
1330                                 | NFS_INO_INVALID_DATA
1331                                 | NFS_INO_INVALID_ACCESS
1332                                 | NFS_INO_INVALID_ACL
1333                                 | NFS_INO_REVAL_PAGECACHE;
1334                         if (S_ISDIR(inode->i_mode))
1335                                 nfs_force_lookup_revalidate(inode);
1336                         inode->i_version = fattr->change_attr;
1337                 }
1338         } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1339                 invalid |= save_cache_validity;
1340
1341         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1342                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1343         } else if (server->caps & NFS_CAP_MTIME)
1344                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1345                                 | NFS_INO_REVAL_FORCED);
1346
1347         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1348                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1349         } else if (server->caps & NFS_CAP_CTIME)
1350                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1351                                 | NFS_INO_REVAL_FORCED);
1352
1353         /* Check if our cached file size is stale */
1354         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1355                 new_isize = nfs_size_to_loff_t(fattr->size);
1356                 cur_isize = i_size_read(inode);
1357                 if (new_isize != cur_isize) {
1358                         /* Do we perhaps have any outstanding writes, or has
1359                          * the file grown beyond our last write? */
1360                         if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1361                              new_isize > cur_isize) {
1362                                 i_size_write(inode, new_isize);
1363                                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1364                         }
1365                         dprintk("NFS: isize change on server for file %s/%ld "
1366                                         "(%Ld to %Ld)\n",
1367                                         inode->i_sb->s_id,
1368                                         inode->i_ino,
1369                                         (long long)cur_isize,
1370                                         (long long)new_isize);
1371                 }
1372         } else
1373                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1374                                 | NFS_INO_REVAL_PAGECACHE
1375                                 | NFS_INO_REVAL_FORCED);
1376
1377
1378         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1379                 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1380         else if (server->caps & NFS_CAP_ATIME)
1381                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1382                                 | NFS_INO_REVAL_FORCED);
1383
1384         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1385                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1386                         umode_t newmode = inode->i_mode & S_IFMT;
1387                         newmode |= fattr->mode & S_IALLUGO;
1388                         inode->i_mode = newmode;
1389                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1390                 }
1391         } else if (server->caps & NFS_CAP_MODE)
1392                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1393                                 | NFS_INO_INVALID_ACCESS
1394                                 | NFS_INO_INVALID_ACL
1395                                 | NFS_INO_REVAL_FORCED);
1396
1397         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1398                 if (inode->i_uid != fattr->uid) {
1399                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1400                         inode->i_uid = fattr->uid;
1401                 }
1402         } else if (server->caps & NFS_CAP_OWNER)
1403                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1404                                 | NFS_INO_INVALID_ACCESS
1405                                 | NFS_INO_INVALID_ACL
1406                                 | NFS_INO_REVAL_FORCED);
1407
1408         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1409                 if (inode->i_gid != fattr->gid) {
1410                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1411                         inode->i_gid = fattr->gid;
1412                 }
1413         } else if (server->caps & NFS_CAP_OWNER_GROUP)
1414                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1415                                 | NFS_INO_INVALID_ACCESS
1416                                 | NFS_INO_INVALID_ACL
1417                                 | NFS_INO_REVAL_FORCED);
1418
1419         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1420                 if (inode->i_nlink != fattr->nlink) {
1421                         invalid |= NFS_INO_INVALID_ATTR;
1422                         if (S_ISDIR(inode->i_mode))
1423                                 invalid |= NFS_INO_INVALID_DATA;
1424                         set_nlink(inode, fattr->nlink);
1425                 }
1426         } else if (server->caps & NFS_CAP_NLINK)
1427                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1428                                 | NFS_INO_REVAL_FORCED);
1429
1430         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1431                 /*
1432                  * report the blocks in 512byte units
1433                  */
1434                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1435         }
1436         if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1437                 inode->i_blocks = fattr->du.nfs2.blocks;
1438
1439         /* Update attrtimeo value if we're out of the unstable period */
1440         if (invalid & NFS_INO_INVALID_ATTR) {
1441                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1442                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1443                 nfsi->attrtimeo_timestamp = now;
1444                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1445         } else {
1446                 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1447                         if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1448                                 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1449                         nfsi->attrtimeo_timestamp = now;
1450                 }
1451         }
1452         invalid &= ~NFS_INO_INVALID_ATTR;
1453         /* Don't invalidate the data if we were to blame */
1454         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1455                                 || S_ISLNK(inode->i_mode)))
1456                 invalid &= ~NFS_INO_INVALID_DATA;
1457         if (!nfs_have_delegation(inode, FMODE_READ) ||
1458                         (save_cache_validity & NFS_INO_REVAL_FORCED))
1459                 nfsi->cache_validity |= invalid;
1460
1461         return 0;
1462  out_err:
1463         /*
1464          * No need to worry about unhashing the dentry, as the
1465          * lookup validation will know that the inode is bad.
1466          * (But we fall through to invalidate the caches.)
1467          */
1468         nfs_invalidate_inode(inode);
1469         return -ESTALE;
1470 }
1471
1472
1473 #ifdef CONFIG_NFS_V4
1474
1475 /*
1476  * Clean out any remaining NFSv4 state that might be left over due
1477  * to open() calls that passed nfs_atomic_lookup, but failed to call
1478  * nfs_open().
1479  */
1480 void nfs4_evict_inode(struct inode *inode)
1481 {
1482         truncate_inode_pages(&inode->i_data, 0);
1483         clear_inode(inode);
1484         pnfs_return_layout(inode);
1485         pnfs_destroy_layout(NFS_I(inode));
1486         /* If we are holding a delegation, return it! */
1487         nfs_inode_return_delegation_noreclaim(inode);
1488         /* First call standard NFS clear_inode() code */
1489         nfs_clear_inode(inode);
1490 }
1491 #endif
1492
1493 struct inode *nfs_alloc_inode(struct super_block *sb)
1494 {
1495         struct nfs_inode *nfsi;
1496         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1497         if (!nfsi)
1498                 return NULL;
1499         nfsi->flags = 0UL;
1500         nfsi->cache_validity = 0UL;
1501 #ifdef CONFIG_NFS_V3_ACL
1502         nfsi->acl_access = ERR_PTR(-EAGAIN);
1503         nfsi->acl_default = ERR_PTR(-EAGAIN);
1504 #endif
1505 #ifdef CONFIG_NFS_V4
1506         nfsi->nfs4_acl = NULL;
1507 #endif /* CONFIG_NFS_V4 */
1508         return &nfsi->vfs_inode;
1509 }
1510
1511 static void nfs_i_callback(struct rcu_head *head)
1512 {
1513         struct inode *inode = container_of(head, struct inode, i_rcu);
1514         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1515 }
1516
1517 void nfs_destroy_inode(struct inode *inode)
1518 {
1519         call_rcu(&inode->i_rcu, nfs_i_callback);
1520 }
1521
1522 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1523 {
1524 #ifdef CONFIG_NFS_V4
1525         INIT_LIST_HEAD(&nfsi->open_states);
1526         nfsi->delegation = NULL;
1527         nfsi->delegation_state = 0;
1528         init_rwsem(&nfsi->rwsem);
1529         nfsi->layout = NULL;
1530         atomic_set(&nfsi->commit_info.rpcs_out, 0);
1531 #endif
1532 }
1533
1534 static void init_once(void *foo)
1535 {
1536         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1537
1538         inode_init_once(&nfsi->vfs_inode);
1539         INIT_LIST_HEAD(&nfsi->open_files);
1540         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1541         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1542         INIT_LIST_HEAD(&nfsi->commit_info.list);
1543         nfsi->npages = 0;
1544         nfsi->commit_info.ncommit = 0;
1545         atomic_set(&nfsi->silly_count, 1);
1546         INIT_HLIST_HEAD(&nfsi->silly_list);
1547         init_waitqueue_head(&nfsi->waitqueue);
1548         nfs4_init_once(nfsi);
1549 }
1550
1551 static int __init nfs_init_inodecache(void)
1552 {
1553         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1554                                              sizeof(struct nfs_inode),
1555                                              0, (SLAB_RECLAIM_ACCOUNT|
1556                                                 SLAB_MEM_SPREAD),
1557                                              init_once);
1558         if (nfs_inode_cachep == NULL)
1559                 return -ENOMEM;
1560
1561         return 0;
1562 }
1563
1564 static void nfs_destroy_inodecache(void)
1565 {
1566         kmem_cache_destroy(nfs_inode_cachep);
1567 }
1568
1569 struct workqueue_struct *nfsiod_workqueue;
1570
1571 /*
1572  * start up the nfsiod workqueue
1573  */
1574 static int nfsiod_start(void)
1575 {
1576         struct workqueue_struct *wq;
1577         dprintk("RPC:       creating workqueue nfsiod\n");
1578         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1579         if (wq == NULL)
1580                 return -ENOMEM;
1581         nfsiod_workqueue = wq;
1582         return 0;
1583 }
1584
1585 /*
1586  * Destroy the nfsiod workqueue
1587  */
1588 static void nfsiod_stop(void)
1589 {
1590         struct workqueue_struct *wq;
1591
1592         wq = nfsiod_workqueue;
1593         if (wq == NULL)
1594                 return;
1595         nfsiod_workqueue = NULL;
1596         destroy_workqueue(wq);
1597 }
1598
1599 int nfs_net_id;
1600 EXPORT_SYMBOL_GPL(nfs_net_id);
1601
1602 static int nfs_net_init(struct net *net)
1603 {
1604         nfs_clients_init(net);
1605         return nfs_dns_resolver_cache_init(net);
1606 }
1607
1608 static void nfs_net_exit(struct net *net)
1609 {
1610         nfs_dns_resolver_cache_destroy(net);
1611         nfs_cleanup_cb_ident_idr(net);
1612 }
1613
1614 static struct pernet_operations nfs_net_ops = {
1615         .init = nfs_net_init,
1616         .exit = nfs_net_exit,
1617         .id   = &nfs_net_id,
1618         .size = sizeof(struct nfs_net),
1619 };
1620
1621 /*
1622  * Initialize NFS
1623  */
1624 static int __init init_nfs_fs(void)
1625 {
1626         int err;
1627
1628         err = nfs_idmap_init();
1629         if (err < 0)
1630                 goto out10;
1631
1632         err = nfs_dns_resolver_init();
1633         if (err < 0)
1634                 goto out9;
1635
1636         err = register_pernet_subsys(&nfs_net_ops);
1637         if (err < 0)
1638                 goto out8;
1639
1640         err = nfs_fscache_register();
1641         if (err < 0)
1642                 goto out7;
1643
1644         err = nfsiod_start();
1645         if (err)
1646                 goto out6;
1647
1648         err = nfs_fs_proc_init();
1649         if (err)
1650                 goto out5;
1651
1652         err = nfs_init_nfspagecache();
1653         if (err)
1654                 goto out4;
1655
1656         err = nfs_init_inodecache();
1657         if (err)
1658                 goto out3;
1659
1660         err = nfs_init_readpagecache();
1661         if (err)
1662                 goto out2;
1663
1664         err = nfs_init_writepagecache();
1665         if (err)
1666                 goto out1;
1667
1668         err = nfs_init_directcache();
1669         if (err)
1670                 goto out0;
1671
1672 #ifdef CONFIG_PROC_FS
1673         rpc_proc_register(&init_net, &nfs_rpcstat);
1674 #endif
1675         if ((err = register_nfs_fs()) != 0)
1676                 goto out;
1677         return 0;
1678 out:
1679 #ifdef CONFIG_PROC_FS
1680         rpc_proc_unregister(&init_net, "nfs");
1681 #endif
1682         nfs_destroy_directcache();
1683 out0:
1684         nfs_destroy_writepagecache();
1685 out1:
1686         nfs_destroy_readpagecache();
1687 out2:
1688         nfs_destroy_inodecache();
1689 out3:
1690         nfs_destroy_nfspagecache();
1691 out4:
1692         nfs_fs_proc_exit();
1693 out5:
1694         nfsiod_stop();
1695 out6:
1696         nfs_fscache_unregister();
1697 out7:
1698         unregister_pernet_subsys(&nfs_net_ops);
1699 out8:
1700         nfs_dns_resolver_destroy();
1701 out9:
1702         nfs_idmap_quit();
1703 out10:
1704         return err;
1705 }
1706
1707 static void __exit exit_nfs_fs(void)
1708 {
1709         nfs_destroy_directcache();
1710         nfs_destroy_writepagecache();
1711         nfs_destroy_readpagecache();
1712         nfs_destroy_inodecache();
1713         nfs_destroy_nfspagecache();
1714         nfs_fscache_unregister();
1715         unregister_pernet_subsys(&nfs_net_ops);
1716         nfs_dns_resolver_destroy();
1717         nfs_idmap_quit();
1718 #ifdef CONFIG_PROC_FS
1719         rpc_proc_unregister(&init_net, "nfs");
1720 #endif
1721         unregister_nfs_fs();
1722         nfs_fs_proc_exit();
1723         nfsiod_stop();
1724 }
1725
1726 /* Not quite true; I just maintain it */
1727 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1728 MODULE_LICENSE("GPL");
1729 module_param(enable_ino64, bool, 0644);
1730
1731 module_init(init_nfs_fs)
1732 module_exit(exit_nfs_fs)