fs/nfs/inode.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
nfs_fattr_to_ino_t
nfs_wait_killable
nfs_wait_bit_killable
nfs_compat_user_ino64
nfs_drop_inode
nfs_clear_inode
nfs_evict_inode
nfs_sync_inode
nfs_sync_mapping
nfs_attribute_timeout
nfs_check_cache_invalid_delegated
nfs_check_cache_invalid_not_delegated
nfs_check_cache_invalid
nfs_set_cache_invalid
nfs_zap_caches_locked
nfs_zap_caches
nfs_zap_mapping
nfs_zap_acl_cache
nfs_invalidate_atime
nfs_invalidate_inode
nfs_find_actor
nfs_init_locked
nfs_clear_label_invalid
nfs_setsecurity
nfs4_label_alloc
nfs_setsecurity
nfs_ilookup
nfs_fhget
nfs_setattr
nfs_vmtruncate
nfs_setattr_update_inode
nfs_readdirplus_parent_cache_miss
nfs_readdirplus_parent_cache_hit
nfs_need_revalidate_inode
nfs_getattr
nfs_init_lock_context
__nfs_find_lock_context
nfs_get_lock_context
nfs_put_lock_context
nfs_close_context
alloc_nfs_open_context
get_nfs_open_context
__put_nfs_open_context
put_nfs_open_context
put_nfs_open_context_sync
nfs_inode_attach_open_context
nfs_file_set_open_context
nfs_find_open_context
nfs_file_clear_open_context
nfs_open
__nfs_revalidate_inode
nfs_attribute_cache_expired
nfs_revalidate_inode
nfs_invalidate_mapping
nfs_mapping_need_revalidate_inode
nfs_revalidate_mapping_rcu
nfs_revalidate_mapping
nfs_file_has_writers
nfs_file_has_buffered_writers
nfs_wcc_update_inode
nfs_check_inode_attributes
nfs_read_attr_generation_counter
nfs_inc_attr_generation_counter
nfs_fattr_init
nfs_fattr_set_barrier
nfs_alloc_fattr
nfs_alloc_fhandle
_nfs_display_fhandle_hash
_nfs_display_fhandle
nfs_inode_attrs_need_update
nfs_refresh_inode_locked
nfs_refresh_inode
nfs_post_op_update_inode_locked
nfs_post_op_update_inode
nfs_post_op_update_inode_force_wcc_locked
nfs_post_op_update_inode_force_wcc
nfs_update_inode
nfs_alloc_inode
nfs_free_inode
nfs4_init_once
init_once
nfs_init_inodecache
nfs_destroy_inodecache
nfsiod_start
nfsiod_stop
nfs_net_init
nfs_net_exit
init_nfs_fs
exit_nfs_fs
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/nfs/inode.c
   4  *
   5  *  Copyright (C) 1992  Rick Sladkey
   6  *
   7  *  nfs inode and superblock handling functions
   8  *
   9  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  10  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  11  *
  12  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  13  *  J.S.Peatfield@damtp.cam.ac.uk
  14  *
  15  */
  16 
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/sched/signal.h>
  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/sunrpc/metrics.h>
  30 #include <linux/nfs_fs.h>
  31 #include <linux/nfs_mount.h>
  32 #include <linux/nfs4_mount.h>
  33 #include <linux/lockd/bind.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/mount.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/uaccess.h>
  43 #include <linux/iversion.h>
  44 
  45 #include "nfs4_fs.h"
  46 #include "callback.h"
  47 #include "delegation.h"
  48 #include "iostat.h"
  49 #include "internal.h"
  50 #include "fscache.h"
  51 #include "pnfs.h"
  52 #include "nfs.h"
  53 #include "netns.h"
  54 #include "sysfs.h"
  55 
  56 #include "nfstrace.h"
  57 
  58 #define NFSDBG_FACILITY         NFSDBG_VFS
  59 
  60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
  61 
  62 /* Default is to see 64-bit inode numbers */
  63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
  64 
  65 static void nfs_invalidate_inode(struct inode *);
  66 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
  67 
  68 static struct kmem_cache * nfs_inode_cachep;
  69 
  70 static inline unsigned long
  71 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
  72 {
  73         return nfs_fileid_to_ino_t(fattr->fileid);
  74 }
  75 
  76 static int nfs_wait_killable(int mode)
  77 {
  78         freezable_schedule_unsafe();
  79         if (signal_pending_state(mode, current))
  80                 return -ERESTARTSYS;
  81         return 0;
  82 }
  83 
  84 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
  85 {
  86         return nfs_wait_killable(mode);
  87 }
  88 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
  89 
  90 /**
  91  * nfs_compat_user_ino64 - returns the user-visible inode number
  92  * @fileid: 64-bit fileid
  93  *
  94  * This function returns a 32-bit inode number if the boot parameter
  95  * nfs.enable_ino64 is zero.
  96  */
  97 u64 nfs_compat_user_ino64(u64 fileid)
  98 {
  99 #ifdef CONFIG_COMPAT
 100         compat_ulong_t ino;
 101 #else   
 102         unsigned long ino;
 103 #endif
 104 
 105         if (enable_ino64)
 106                 return fileid;
 107         ino = fileid;
 108         if (sizeof(ino) < sizeof(fileid))
 109                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
 110         return ino;
 111 }
 112 
 113 int nfs_drop_inode(struct inode *inode)
 114 {
 115         return NFS_STALE(inode) || generic_drop_inode(inode);
 116 }
 117 EXPORT_SYMBOL_GPL(nfs_drop_inode);
 118 
 119 void nfs_clear_inode(struct inode *inode)
 120 {
 121         /*
 122          * The following should never happen...
 123          */
 124         WARN_ON_ONCE(nfs_have_writebacks(inode));
 125         WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
 126         nfs_zap_acl_cache(inode);
 127         nfs_access_zap_cache(inode);
 128         nfs_fscache_clear_inode(inode);
 129 }
 130 EXPORT_SYMBOL_GPL(nfs_clear_inode);
 131 
 132 void nfs_evict_inode(struct inode *inode)
 133 {
 134         truncate_inode_pages_final(&inode->i_data);
 135         clear_inode(inode);
 136         nfs_clear_inode(inode);
 137 }
 138 
 139 int nfs_sync_inode(struct inode *inode)
 140 {
 141         inode_dio_wait(inode);
 142         return nfs_wb_all(inode);
 143 }
 144 EXPORT_SYMBOL_GPL(nfs_sync_inode);
 145 
 146 /**
 147  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
 148  * @mapping: pointer to struct address_space
 149  */
 150 int nfs_sync_mapping(struct address_space *mapping)
 151 {
 152         int ret = 0;
 153 
 154         if (mapping->nrpages != 0) {
 155                 unmap_mapping_range(mapping, 0, 0, 0);
 156                 ret = nfs_wb_all(mapping->host);
 157         }
 158         return ret;
 159 }
 160 
 161 static int nfs_attribute_timeout(struct inode *inode)
 162 {
 163         struct nfs_inode *nfsi = NFS_I(inode);
 164 
 165         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
 166 }
 167 
 168 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
 169 {
 170         unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 171 
 172         /* Special case for the pagecache or access cache */
 173         if (flags == NFS_INO_REVAL_PAGECACHE &&
 174             !(cache_validity & NFS_INO_REVAL_FORCED))
 175                 return false;
 176         return (cache_validity & flags) != 0;
 177 }
 178 
 179 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
 180 {
 181         unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 182 
 183         if ((cache_validity & flags) != 0)
 184                 return true;
 185         if (nfs_attribute_timeout(inode))
 186                 return true;
 187         return false;
 188 }
 189 
 190 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
 191 {
 192         if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
 193                 return nfs_check_cache_invalid_delegated(inode, flags);
 194 
 195         return nfs_check_cache_invalid_not_delegated(inode, flags);
 196 }
 197 
 198 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
 199 {
 200         struct nfs_inode *nfsi = NFS_I(inode);
 201         bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
 202 
 203         if (have_delegation) {
 204                 if (!(flags & NFS_INO_REVAL_FORCED))
 205                         flags &= ~NFS_INO_INVALID_OTHER;
 206                 flags &= ~(NFS_INO_INVALID_CHANGE
 207                                 | NFS_INO_INVALID_SIZE
 208                                 | NFS_INO_REVAL_PAGECACHE);
 209         }
 210 
 211         if (inode->i_mapping->nrpages == 0)
 212                 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
 213         nfsi->cache_validity |= flags;
 214         if (flags & NFS_INO_INVALID_DATA)
 215                 nfs_fscache_invalidate(inode);
 216 }
 217 
 218 /*
 219  * Invalidate the local caches
 220  */
 221 static void nfs_zap_caches_locked(struct inode *inode)
 222 {
 223         struct nfs_inode *nfsi = NFS_I(inode);
 224         int mode = inode->i_mode;
 225 
 226         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 227 
 228         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 229         nfsi->attrtimeo_timestamp = jiffies;
 230 
 231         memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
 232         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
 233                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
 234                                         | NFS_INO_INVALID_DATA
 235                                         | NFS_INO_INVALID_ACCESS
 236                                         | NFS_INO_INVALID_ACL
 237                                         | NFS_INO_REVAL_PAGECACHE);
 238         } else
 239                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
 240                                         | NFS_INO_INVALID_ACCESS
 241                                         | NFS_INO_INVALID_ACL
 242                                         | NFS_INO_REVAL_PAGECACHE);
 243         nfs_zap_label_cache_locked(nfsi);
 244 }
 245 
 246 void nfs_zap_caches(struct inode *inode)
 247 {
 248         spin_lock(&inode->i_lock);
 249         nfs_zap_caches_locked(inode);
 250         spin_unlock(&inode->i_lock);
 251 }
 252 
 253 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
 254 {
 255         if (mapping->nrpages != 0) {
 256                 spin_lock(&inode->i_lock);
 257                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
 258                 spin_unlock(&inode->i_lock);
 259         }
 260 }
 261 
 262 void nfs_zap_acl_cache(struct inode *inode)
 263 {
 264         void (*clear_acl_cache)(struct inode *);
 265 
 266         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
 267         if (clear_acl_cache != NULL)
 268                 clear_acl_cache(inode);
 269         spin_lock(&inode->i_lock);
 270         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
 271         spin_unlock(&inode->i_lock);
 272 }
 273 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
 274 
 275 void nfs_invalidate_atime(struct inode *inode)
 276 {
 277         spin_lock(&inode->i_lock);
 278         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 279         spin_unlock(&inode->i_lock);
 280 }
 281 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
 282 
 283 /*
 284  * Invalidate, but do not unhash, the inode.
 285  * NB: must be called with inode->i_lock held!
 286  */
 287 static void nfs_invalidate_inode(struct inode *inode)
 288 {
 289         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 290         nfs_zap_caches_locked(inode);
 291 }
 292 
 293 struct nfs_find_desc {
 294         struct nfs_fh           *fh;
 295         struct nfs_fattr        *fattr;
 296 };
 297 
 298 /*
 299  * In NFSv3 we can have 64bit inode numbers. In order to support
 300  * this, and re-exported directories (also seen in NFSv2)
 301  * we are forced to allow 2 different inodes to have the same
 302  * i_ino.
 303  */
 304 static int
 305 nfs_find_actor(struct inode *inode, void *opaque)
 306 {
 307         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
 308         struct nfs_fh           *fh = desc->fh;
 309         struct nfs_fattr        *fattr = desc->fattr;
 310 
 311         if (NFS_FILEID(inode) != fattr->fileid)
 312                 return 0;
 313         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
 314                 return 0;
 315         if (nfs_compare_fh(NFS_FH(inode), fh))
 316                 return 0;
 317         if (is_bad_inode(inode) || NFS_STALE(inode))
 318                 return 0;
 319         return 1;
 320 }
 321 
 322 static int
 323 nfs_init_locked(struct inode *inode, void *opaque)
 324 {
 325         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
 326         struct nfs_fattr        *fattr = desc->fattr;
 327 
 328         set_nfs_fileid(inode, fattr->fileid);
 329         inode->i_mode = fattr->mode;
 330         nfs_copy_fh(NFS_FH(inode), desc->fh);
 331         return 0;
 332 }
 333 
 334 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 335 static void nfs_clear_label_invalid(struct inode *inode)
 336 {
 337         spin_lock(&inode->i_lock);
 338         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
 339         spin_unlock(&inode->i_lock);
 340 }
 341 
 342 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 343                                         struct nfs4_label *label)
 344 {
 345         int error;
 346 
 347         if (label == NULL)
 348                 return;
 349 
 350         if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
 351                 error = security_inode_notifysecctx(inode, label->label,
 352                                 label->len);
 353                 if (error)
 354                         printk(KERN_ERR "%s() %s %d "
 355                                         "security_inode_notifysecctx() %d\n",
 356                                         __func__,
 357                                         (char *)label->label,
 358                                         label->len, error);
 359                 nfs_clear_label_invalid(inode);
 360         }
 361 }
 362 
 363 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
 364 {
 365         struct nfs4_label *label = NULL;
 366         int minor_version = server->nfs_client->cl_minorversion;
 367 
 368         if (minor_version < 2)
 369                 return label;
 370 
 371         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
 372                 return label;
 373 
 374         label = kzalloc(sizeof(struct nfs4_label), flags);
 375         if (label == NULL)
 376                 return ERR_PTR(-ENOMEM);
 377 
 378         label->label = kzalloc(NFS4_MAXLABELLEN, flags);
 379         if (label->label == NULL) {
 380                 kfree(label);
 381                 return ERR_PTR(-ENOMEM);
 382         }
 383         label->len = NFS4_MAXLABELLEN;
 384 
 385         return label;
 386 }
 387 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
 388 #else
 389 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 390                                         struct nfs4_label *label)
 391 {
 392 }
 393 #endif
 394 EXPORT_SYMBOL_GPL(nfs_setsecurity);
 395 
 396 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
 397 struct inode *
 398 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
 399 {
 400         struct nfs_find_desc desc = {
 401                 .fh     = fh,
 402                 .fattr  = fattr,
 403         };
 404         struct inode *inode;
 405         unsigned long hash;
 406 
 407         if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
 408             !(fattr->valid & NFS_ATTR_FATTR_TYPE))
 409                 return NULL;
 410 
 411         hash = nfs_fattr_to_ino_t(fattr);
 412         inode = ilookup5(sb, hash, nfs_find_actor, &desc);
 413 
 414         dprintk("%s: returning %p\n", __func__, inode);
 415         return inode;
 416 }
 417 
 418 /*
 419  * This is our front-end to iget that looks up inodes by file handle
 420  * instead of inode number.
 421  */
 422 struct inode *
 423 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
 424 {
 425         struct nfs_find_desc desc = {
 426                 .fh     = fh,
 427                 .fattr  = fattr
 428         };
 429         struct inode *inode = ERR_PTR(-ENOENT);
 430         unsigned long hash;
 431 
 432         nfs_attr_check_mountpoint(sb, fattr);
 433 
 434         if (nfs_attr_use_mounted_on_fileid(fattr))
 435                 fattr->fileid = fattr->mounted_on_fileid;
 436         else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
 437                 goto out_no_inode;
 438         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
 439                 goto out_no_inode;
 440 
 441         hash = nfs_fattr_to_ino_t(fattr);
 442 
 443         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
 444         if (inode == NULL) {
 445                 inode = ERR_PTR(-ENOMEM);
 446                 goto out_no_inode;
 447         }
 448 
 449         if (inode->i_state & I_NEW) {
 450                 struct nfs_inode *nfsi = NFS_I(inode);
 451                 unsigned long now = jiffies;
 452 
 453                 /* We set i_ino for the few things that still rely on it,
 454                  * such as stat(2) */
 455                 inode->i_ino = hash;
 456 
 457                 /* We can't support update_atime(), since the server will reset it */
 458                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
 459                 inode->i_mode = fattr->mode;
 460                 nfsi->cache_validity = 0;
 461                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
 462                                 && nfs_server_capable(inode, NFS_CAP_MODE))
 463                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 464                 /* Why so? Because we want revalidate for devices/FIFOs, and
 465                  * that's precisely what we have in nfs_file_inode_operations.
 466                  */
 467                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
 468                 if (S_ISREG(inode->i_mode)) {
 469                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
 470                         inode->i_data.a_ops = &nfs_file_aops;
 471                 } else if (S_ISDIR(inode->i_mode)) {
 472                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
 473                         inode->i_fop = &nfs_dir_operations;
 474                         inode->i_data.a_ops = &nfs_dir_aops;
 475                         /* Deal with crossing mountpoints */
 476                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
 477                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
 478                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
 479                                         inode->i_op = &nfs_referral_inode_operations;
 480                                 else
 481                                         inode->i_op = &nfs_mountpoint_inode_operations;
 482                                 inode->i_fop = NULL;
 483                                 inode->i_flags |= S_AUTOMOUNT;
 484                         }
 485                 } else if (S_ISLNK(inode->i_mode)) {
 486                         inode->i_op = &nfs_symlink_inode_operations;
 487                         inode_nohighmem(inode);
 488                 } else
 489                         init_special_inode(inode, inode->i_mode, fattr->rdev);
 490 
 491                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
 492                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
 493                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
 494                 inode_set_iversion_raw(inode, 0);
 495                 inode->i_size = 0;
 496                 clear_nlink(inode);
 497                 inode->i_uid = make_kuid(&init_user_ns, -2);
 498                 inode->i_gid = make_kgid(&init_user_ns, -2);
 499                 inode->i_blocks = 0;
 500                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 501                 nfsi->write_io = 0;
 502                 nfsi->read_io = 0;
 503 
 504                 nfsi->read_cache_jiffies = fattr->time_start;
 505                 nfsi->attr_gencount = fattr->gencount;
 506                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
 507                         inode->i_atime = timespec_to_timespec64(fattr->atime);
 508                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
 509                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 510                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
 511                         inode->i_mtime = timespec_to_timespec64(fattr->mtime);
 512                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
 513                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 514                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 515                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
 516                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
 517                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
 518                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
 519                         inode_set_iversion_raw(inode, fattr->change_attr);
 520                 else
 521                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
 522                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
 523                         inode->i_size = nfs_size_to_loff_t(fattr->size);
 524                 else
 525                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
 526                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
 527                         set_nlink(inode, fattr->nlink);
 528                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
 529                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 530                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
 531                         inode->i_uid = fattr->uid;
 532                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
 533                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 534                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
 535                         inode->i_gid = fattr->gid;
 536                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
 537                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 538                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
 539                         inode->i_blocks = fattr->du.nfs2.blocks;
 540                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
 541                         /*
 542                          * report the blocks in 512byte units
 543                          */
 544                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
 545                 }
 546 
 547                 if (nfsi->cache_validity != 0)
 548                         nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
 549 
 550                 nfs_setsecurity(inode, fattr, label);
 551 
 552                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 553                 nfsi->attrtimeo_timestamp = now;
 554                 nfsi->access_cache = RB_ROOT;
 555 
 556                 nfs_fscache_init_inode(inode);
 557 
 558                 unlock_new_inode(inode);
 559         } else {
 560                 int err = nfs_refresh_inode(inode, fattr);
 561                 if (err < 0) {
 562                         iput(inode);
 563                         inode = ERR_PTR(err);
 564                         goto out_no_inode;
 565                 }
 566         }
 567         dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
 568                 inode->i_sb->s_id,
 569                 (unsigned long long)NFS_FILEID(inode),
 570                 nfs_display_fhandle_hash(fh),
 571                 atomic_read(&inode->i_count));
 572 
 573 out:
 574         return inode;
 575 
 576 out_no_inode:
 577         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
 578         goto out;
 579 }
 580 EXPORT_SYMBOL_GPL(nfs_fhget);
 581 
 582 #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)
 583 
 584 int
 585 nfs_setattr(struct dentry *dentry, struct iattr *attr)
 586 {
 587         struct inode *inode = d_inode(dentry);
 588         struct nfs_fattr *fattr;
 589         int error = 0;
 590 
 591         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
 592 
 593         /* skip mode change if it's just for clearing setuid/setgid */
 594         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 595                 attr->ia_valid &= ~ATTR_MODE;
 596 
 597         if (attr->ia_valid & ATTR_SIZE) {
 598                 BUG_ON(!S_ISREG(inode->i_mode));
 599 
 600                 error = inode_newsize_ok(inode, attr->ia_size);
 601                 if (error)
 602                         return error;
 603 
 604                 if (attr->ia_size == i_size_read(inode))
 605                         attr->ia_valid &= ~ATTR_SIZE;
 606         }
 607 
 608         /* Optimization: if the end result is no change, don't RPC */
 609         attr->ia_valid &= NFS_VALID_ATTRS;
 610         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
 611                 return 0;
 612 
 613         trace_nfs_setattr_enter(inode);
 614 
 615         /* Write all dirty data */
 616         if (S_ISREG(inode->i_mode))
 617                 nfs_sync_inode(inode);
 618 
 619         fattr = nfs_alloc_fattr();
 620         if (fattr == NULL) {
 621                 error = -ENOMEM;
 622                 goto out;
 623         }
 624 
 625         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
 626         if (error == 0)
 627                 error = nfs_refresh_inode(inode, fattr);
 628         nfs_free_fattr(fattr);
 629 out:
 630         trace_nfs_setattr_exit(inode, error);
 631         return error;
 632 }
 633 EXPORT_SYMBOL_GPL(nfs_setattr);
 634 
 635 /**
 636  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
 637  * @inode: inode of the file used
 638  * @offset: file offset to start truncating
 639  *
 640  * This is a copy of the common vmtruncate, but with the locking
 641  * corrected to take into account the fact that NFS requires
 642  * inode->i_size to be updated under the inode->i_lock.
 643  * Note: must be called with inode->i_lock held!
 644  */
 645 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
 646 {
 647         int err;
 648 
 649         err = inode_newsize_ok(inode, offset);
 650         if (err)
 651                 goto out;
 652 
 653         i_size_write(inode, offset);
 654         /* Optimisation */
 655         if (offset == 0)
 656                 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
 657                                 NFS_INO_DATA_INVAL_DEFER);
 658         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
 659 
 660         spin_unlock(&inode->i_lock);
 661         truncate_pagecache(inode, offset);
 662         spin_lock(&inode->i_lock);
 663 out:
 664         return err;
 665 }
 666 
 667 /**
 668  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 669  * @inode: pointer to struct inode
 670  * @attr: pointer to struct iattr
 671  * @fattr: pointer to struct nfs_fattr
 672  *
 673  * Note: we do this in the *proc.c in order to ensure that
 674  *       it works for things like exclusive creates too.
 675  */
 676 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
 677                 struct nfs_fattr *fattr)
 678 {
 679         /* Barrier: bump the attribute generation count. */
 680         nfs_fattr_set_barrier(fattr);
 681 
 682         spin_lock(&inode->i_lock);
 683         NFS_I(inode)->attr_gencount = fattr->gencount;
 684         if ((attr->ia_valid & ATTR_SIZE) != 0) {
 685                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 686                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
 687                 nfs_vmtruncate(inode, attr->ia_size);
 688         }
 689         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
 690                 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
 691                 if ((attr->ia_valid & ATTR_MODE) != 0) {
 692                         int mode = attr->ia_mode & S_IALLUGO;
 693                         mode |= inode->i_mode & ~S_IALLUGO;
 694                         inode->i_mode = mode;
 695                 }
 696                 if ((attr->ia_valid & ATTR_UID) != 0)
 697                         inode->i_uid = attr->ia_uid;
 698                 if ((attr->ia_valid & ATTR_GID) != 0)
 699                         inode->i_gid = attr->ia_gid;
 700                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 701                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
 702                 else
 703                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 704                                         | NFS_INO_INVALID_CTIME);
 705                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
 706                                 | NFS_INO_INVALID_ACL);
 707         }
 708         if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
 709                 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
 710                                 | NFS_INO_INVALID_CTIME);
 711                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
 712                         inode->i_atime = timespec_to_timespec64(fattr->atime);
 713                 else if (attr->ia_valid & ATTR_ATIME_SET)
 714                         inode->i_atime = attr->ia_atime;
 715                 else
 716                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 717 
 718                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 719                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
 720                 else
 721                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 722                                         | NFS_INO_INVALID_CTIME);
 723         }
 724         if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
 725                 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
 726                                 | NFS_INO_INVALID_CTIME);
 727                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
 728                         inode->i_mtime = timespec_to_timespec64(fattr->mtime);
 729                 else if (attr->ia_valid & ATTR_MTIME_SET)
 730                         inode->i_mtime = attr->ia_mtime;
 731                 else
 732                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 733 
 734                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 735                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
 736                 else
 737                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 738                                         | NFS_INO_INVALID_CTIME);
 739         }
 740         if (fattr->valid)
 741                 nfs_update_inode(inode, fattr);
 742         spin_unlock(&inode->i_lock);
 743 }
 744 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
 745 
 746 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
 747 {
 748         struct dentry *parent;
 749 
 750         if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
 751                 return;
 752         parent = dget_parent(dentry);
 753         nfs_force_use_readdirplus(d_inode(parent));
 754         dput(parent);
 755 }
 756 
 757 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
 758 {
 759         struct dentry *parent;
 760 
 761         if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
 762                 return;
 763         parent = dget_parent(dentry);
 764         nfs_advise_use_readdirplus(d_inode(parent));
 765         dput(parent);
 766 }
 767 
 768 static bool nfs_need_revalidate_inode(struct inode *inode)
 769 {
 770         if (NFS_I(inode)->cache_validity &
 771                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
 772                 return true;
 773         if (nfs_attribute_cache_expired(inode))
 774                 return true;
 775         return false;
 776 }
 777 
 778 int nfs_getattr(const struct path *path, struct kstat *stat,
 779                 u32 request_mask, unsigned int query_flags)
 780 {
 781         struct inode *inode = d_inode(path->dentry);
 782         struct nfs_server *server = NFS_SERVER(inode);
 783         unsigned long cache_validity;
 784         int err = 0;
 785         bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
 786         bool do_update = false;
 787 
 788         trace_nfs_getattr_enter(inode);
 789 
 790         if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
 791                 goto out_no_update;
 792 
 793         /* Flush out writes to the server in order to update c/mtime.  */
 794         if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
 795                         S_ISREG(inode->i_mode)) {
 796                 err = filemap_write_and_wait(inode->i_mapping);
 797                 if (err)
 798                         goto out;
 799         }
 800 
 801         /*
 802          * We may force a getattr if the user cares about atime.
 803          *
 804          * Note that we only have to check the vfsmount flags here:
 805          *  - NFS always sets S_NOATIME by so checking it would give a
 806          *    bogus result
 807          *  - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
 808          *    no point in checking those.
 809          */
 810         if ((path->mnt->mnt_flags & MNT_NOATIME) ||
 811             ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 812                 request_mask &= ~STATX_ATIME;
 813 
 814         /* Is the user requesting attributes that might need revalidation? */
 815         if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
 816                                         STATX_MTIME|STATX_UID|STATX_GID|
 817                                         STATX_SIZE|STATX_BLOCKS)))
 818                 goto out_no_revalidate;
 819 
 820         /* Check whether the cached attributes are stale */
 821         do_update |= force_sync || nfs_attribute_cache_expired(inode);
 822         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 823         do_update |= cache_validity &
 824                 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
 825         if (request_mask & STATX_ATIME)
 826                 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
 827         if (request_mask & (STATX_CTIME|STATX_MTIME))
 828                 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
 829         if (do_update) {
 830                 /* Update the attribute cache */
 831                 if (!(server->flags & NFS_MOUNT_NOAC))
 832                         nfs_readdirplus_parent_cache_miss(path->dentry);
 833                 else
 834                         nfs_readdirplus_parent_cache_hit(path->dentry);
 835                 err = __nfs_revalidate_inode(server, inode);
 836                 if (err)
 837                         goto out;
 838         } else
 839                 nfs_readdirplus_parent_cache_hit(path->dentry);
 840 out_no_revalidate:
 841         /* Only return attributes that were revalidated. */
 842         stat->result_mask &= request_mask;
 843 out_no_update:
 844         generic_fillattr(inode, stat);
 845         stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
 846         if (S_ISDIR(inode->i_mode))
 847                 stat->blksize = NFS_SERVER(inode)->dtsize;
 848 out:
 849         trace_nfs_getattr_exit(inode, err);
 850         return err;
 851 }
 852 EXPORT_SYMBOL_GPL(nfs_getattr);
 853 
 854 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
 855 {
 856         refcount_set(&l_ctx->count, 1);
 857         l_ctx->lockowner = current->files;
 858         INIT_LIST_HEAD(&l_ctx->list);
 859         atomic_set(&l_ctx->io_count, 0);
 860 }
 861 
 862 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
 863 {
 864         struct nfs_lock_context *pos;
 865 
 866         list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
 867                 if (pos->lockowner != current->files)
 868                         continue;
 869                 if (refcount_inc_not_zero(&pos->count))
 870                         return pos;
 871         }
 872         return NULL;
 873 }
 874 
 875 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
 876 {
 877         struct nfs_lock_context *res, *new = NULL;
 878         struct inode *inode = d_inode(ctx->dentry);
 879 
 880         rcu_read_lock();
 881         res = __nfs_find_lock_context(ctx);
 882         rcu_read_unlock();
 883         if (res == NULL) {
 884                 new = kmalloc(sizeof(*new), GFP_KERNEL);
 885                 if (new == NULL)
 886                         return ERR_PTR(-ENOMEM);
 887                 nfs_init_lock_context(new);
 888                 spin_lock(&inode->i_lock);
 889                 res = __nfs_find_lock_context(ctx);
 890                 if (res == NULL) {
 891                         new->open_context = get_nfs_open_context(ctx);
 892                         if (new->open_context) {
 893                                 list_add_tail_rcu(&new->list,
 894                                                 &ctx->lock_context.list);
 895                                 res = new;
 896                                 new = NULL;
 897                         } else
 898                                 res = ERR_PTR(-EBADF);
 899                 }
 900                 spin_unlock(&inode->i_lock);
 901                 kfree(new);
 902         }
 903         return res;
 904 }
 905 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
 906 
 907 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
 908 {
 909         struct nfs_open_context *ctx = l_ctx->open_context;
 910         struct inode *inode = d_inode(ctx->dentry);
 911 
 912         if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
 913                 return;
 914         list_del_rcu(&l_ctx->list);
 915         spin_unlock(&inode->i_lock);
 916         put_nfs_open_context(ctx);
 917         kfree_rcu(l_ctx, rcu_head);
 918 }
 919 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
 920 
 921 /**
 922  * nfs_close_context - Common close_context() routine NFSv2/v3
 923  * @ctx: pointer to context
 924  * @is_sync: is this a synchronous close
 925  *
 926  * Ensure that the attributes are up to date if we're mounted
 927  * with close-to-open semantics and we have cached data that will
 928  * need to be revalidated on open.
 929  */
 930 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
 931 {
 932         struct nfs_inode *nfsi;
 933         struct inode *inode;
 934         struct nfs_server *server;
 935 
 936         if (!(ctx->mode & FMODE_WRITE))
 937                 return;
 938         if (!is_sync)
 939                 return;
 940         inode = d_inode(ctx->dentry);
 941         if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
 942                 return;
 943         nfsi = NFS_I(inode);
 944         if (inode->i_mapping->nrpages == 0)
 945                 return;
 946         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
 947                 return;
 948         if (!list_empty(&nfsi->open_files))
 949                 return;
 950         server = NFS_SERVER(inode);
 951         if (server->flags & NFS_MOUNT_NOCTO)
 952                 return;
 953         nfs_revalidate_inode(server, inode);
 954 }
 955 EXPORT_SYMBOL_GPL(nfs_close_context);
 956 
 957 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
 958                                                 fmode_t f_mode,
 959                                                 struct file *filp)
 960 {
 961         struct nfs_open_context *ctx;
 962 
 963         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 964         if (!ctx)
 965                 return ERR_PTR(-ENOMEM);
 966         nfs_sb_active(dentry->d_sb);
 967         ctx->dentry = dget(dentry);
 968         if (filp)
 969                 ctx->cred = get_cred(filp->f_cred);
 970         else
 971                 ctx->cred = get_current_cred();
 972         ctx->ll_cred = NULL;
 973         ctx->state = NULL;
 974         ctx->mode = f_mode;
 975         ctx->flags = 0;
 976         ctx->error = 0;
 977         ctx->flock_owner = (fl_owner_t)filp;
 978         nfs_init_lock_context(&ctx->lock_context);
 979         ctx->lock_context.open_context = ctx;
 980         INIT_LIST_HEAD(&ctx->list);
 981         ctx->mdsthreshold = NULL;
 982         return ctx;
 983 }
 984 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
 985 
 986 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
 987 {
 988         if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
 989                 return ctx;
 990         return NULL;
 991 }
 992 EXPORT_SYMBOL_GPL(get_nfs_open_context);
 993 
 994 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
 995 {
 996         struct inode *inode = d_inode(ctx->dentry);
 997         struct super_block *sb = ctx->dentry->d_sb;
 998 
 999         if (!refcount_dec_and_test(&ctx->lock_context.count))
1000                 return;
1001         if (!list_empty(&ctx->list)) {
1002                 spin_lock(&inode->i_lock);
1003                 list_del_rcu(&ctx->list);
1004                 spin_unlock(&inode->i_lock);
1005         }
1006         if (inode != NULL)
1007                 NFS_PROTO(inode)->close_context(ctx, is_sync);
1008         put_cred(ctx->cred);
1009         dput(ctx->dentry);
1010         nfs_sb_deactive(sb);
1011         put_rpccred(ctx->ll_cred);
1012         kfree(ctx->mdsthreshold);
1013         kfree_rcu(ctx, rcu_head);
1014 }
1015 
1016 void put_nfs_open_context(struct nfs_open_context *ctx)
1017 {
1018         __put_nfs_open_context(ctx, 0);
1019 }
1020 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1021 
1022 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1023 {
1024         __put_nfs_open_context(ctx, 1);
1025 }
1026 
1027 /*
1028  * Ensure that mmap has a recent RPC credential for use when writing out
1029  * shared pages
1030  */
1031 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1032 {
1033         struct inode *inode = d_inode(ctx->dentry);
1034         struct nfs_inode *nfsi = NFS_I(inode);
1035 
1036         spin_lock(&inode->i_lock);
1037         if (list_empty(&nfsi->open_files) &&
1038             (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1039                 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1040                         NFS_INO_REVAL_FORCED;
1041         list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1042         spin_unlock(&inode->i_lock);
1043 }
1044 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1045 
1046 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1047 {
1048         filp->private_data = get_nfs_open_context(ctx);
1049         if (list_empty(&ctx->list))
1050                 nfs_inode_attach_open_context(ctx);
1051 }
1052 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1053 
1054 /*
1055  * Given an inode, search for an open context with the desired characteristics
1056  */
1057 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1058 {
1059         struct nfs_inode *nfsi = NFS_I(inode);
1060         struct nfs_open_context *pos, *ctx = NULL;
1061 
1062         rcu_read_lock();
1063         list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1064                 if (cred != NULL && pos->cred != cred)
1065                         continue;
1066                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1067                         continue;
1068                 ctx = get_nfs_open_context(pos);
1069                 if (ctx)
1070                         break;
1071         }
1072         rcu_read_unlock();
1073         return ctx;
1074 }
1075 
1076 void nfs_file_clear_open_context(struct file *filp)
1077 {
1078         struct nfs_open_context *ctx = nfs_file_open_context(filp);
1079 
1080         if (ctx) {
1081                 struct inode *inode = d_inode(ctx->dentry);
1082 
1083                 /*
1084                  * We fatal error on write before. Try to writeback
1085                  * every page again.
1086                  */
1087                 if (ctx->error < 0)
1088                         invalidate_inode_pages2(inode->i_mapping);
1089                 filp->private_data = NULL;
1090                 put_nfs_open_context_sync(ctx);
1091         }
1092 }
1093 
1094 /*
1095  * These allocate and release file read/write context information.
1096  */
1097 int nfs_open(struct inode *inode, struct file *filp)
1098 {
1099         struct nfs_open_context *ctx;
1100 
1101         ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1102         if (IS_ERR(ctx))
1103                 return PTR_ERR(ctx);
1104         nfs_file_set_open_context(filp, ctx);
1105         put_nfs_open_context(ctx);
1106         nfs_fscache_open_file(inode, filp);
1107         return 0;
1108 }
1109 EXPORT_SYMBOL_GPL(nfs_open);
1110 
1111 /*
1112  * This function is called whenever some part of NFS notices that
1113  * the cached attributes have to be refreshed.
1114  */
1115 int
1116 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1117 {
1118         int              status = -ESTALE;
1119         struct nfs4_label *label = NULL;
1120         struct nfs_fattr *fattr = NULL;
1121         struct nfs_inode *nfsi = NFS_I(inode);
1122 
1123         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1124                 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1125 
1126         trace_nfs_revalidate_inode_enter(inode);
1127 
1128         if (is_bad_inode(inode))
1129                 goto out;
1130         if (NFS_STALE(inode))
1131                 goto out;
1132 
1133         /* pNFS: Attributes aren't updated until we layoutcommit */
1134         if (S_ISREG(inode->i_mode)) {
1135                 status = pnfs_sync_inode(inode, false);
1136                 if (status)
1137                         goto out;
1138         }
1139 
1140         status = -ENOMEM;
1141         fattr = nfs_alloc_fattr();
1142         if (fattr == NULL)
1143                 goto out;
1144 
1145         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1146 
1147         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1148         if (IS_ERR(label)) {
1149                 status = PTR_ERR(label);
1150                 goto out;
1151         }
1152 
1153         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1154                         label, inode);
1155         if (status != 0) {
1156                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1157                          inode->i_sb->s_id,
1158                          (unsigned long long)NFS_FILEID(inode), status);
1159                 if (status == -ESTALE) {
1160                         nfs_zap_caches(inode);
1161                         if (!S_ISDIR(inode->i_mode))
1162                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1163                 }
1164                 goto err_out;
1165         }
1166 
1167         status = nfs_refresh_inode(inode, fattr);
1168         if (status) {
1169                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1170                          inode->i_sb->s_id,
1171                          (unsigned long long)NFS_FILEID(inode), status);
1172                 goto err_out;
1173         }
1174 
1175         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1176                 nfs_zap_acl_cache(inode);
1177 
1178         nfs_setsecurity(inode, fattr, label);
1179 
1180         dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1181                 inode->i_sb->s_id,
1182                 (unsigned long long)NFS_FILEID(inode));
1183 
1184 err_out:
1185         nfs4_label_free(label);
1186 out:
1187         nfs_free_fattr(fattr);
1188         trace_nfs_revalidate_inode_exit(inode, status);
1189         return status;
1190 }
1191 
1192 int nfs_attribute_cache_expired(struct inode *inode)
1193 {
1194         if (nfs_have_delegated_attributes(inode))
1195                 return 0;
1196         return nfs_attribute_timeout(inode);
1197 }
1198 
1199 /**
1200  * nfs_revalidate_inode - Revalidate the inode attributes
1201  * @server: pointer to nfs_server struct
1202  * @inode: pointer to inode struct
1203  *
1204  * Updates inode attribute information by retrieving the data from the server.
1205  */
1206 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1207 {
1208         if (!nfs_need_revalidate_inode(inode))
1209                 return NFS_STALE(inode) ? -ESTALE : 0;
1210         return __nfs_revalidate_inode(server, inode);
1211 }
1212 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1213 
1214 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1215 {
1216         struct nfs_inode *nfsi = NFS_I(inode);
1217         int ret;
1218 
1219         if (mapping->nrpages != 0) {
1220                 if (S_ISREG(inode->i_mode)) {
1221                         ret = nfs_sync_mapping(mapping);
1222                         if (ret < 0)
1223                                 return ret;
1224                 }
1225                 ret = invalidate_inode_pages2(mapping);
1226                 if (ret < 0)
1227                         return ret;
1228         }
1229         if (S_ISDIR(inode->i_mode)) {
1230                 spin_lock(&inode->i_lock);
1231                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1232                 spin_unlock(&inode->i_lock);
1233         }
1234         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1235         nfs_fscache_wait_on_invalidate(inode);
1236 
1237         dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1238                         inode->i_sb->s_id,
1239                         (unsigned long long)NFS_FILEID(inode));
1240         return 0;
1241 }
1242 
1243 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1244 {
1245         return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1246                 NFS_STALE(inode);
1247 }
1248 
1249 int nfs_revalidate_mapping_rcu(struct inode *inode)
1250 {
1251         struct nfs_inode *nfsi = NFS_I(inode);
1252         unsigned long *bitlock = &nfsi->flags;
1253         int ret = 0;
1254 
1255         if (IS_SWAPFILE(inode))
1256                 goto out;
1257         if (nfs_mapping_need_revalidate_inode(inode)) {
1258                 ret = -ECHILD;
1259                 goto out;
1260         }
1261         spin_lock(&inode->i_lock);
1262         if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1263             (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1264                 ret = -ECHILD;
1265         spin_unlock(&inode->i_lock);
1266 out:
1267         return ret;
1268 }
1269 
1270 /**
1271  * nfs_revalidate_mapping - Revalidate the pagecache
1272  * @inode: pointer to host inode
1273  * @mapping: pointer to mapping
1274  */
1275 int nfs_revalidate_mapping(struct inode *inode,
1276                 struct address_space *mapping)
1277 {
1278         struct nfs_inode *nfsi = NFS_I(inode);
1279         unsigned long *bitlock = &nfsi->flags;
1280         int ret = 0;
1281 
1282         /* swapfiles are not supposed to be shared. */
1283         if (IS_SWAPFILE(inode))
1284                 goto out;
1285 
1286         if (nfs_mapping_need_revalidate_inode(inode)) {
1287                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1288                 if (ret < 0)
1289                         goto out;
1290         }
1291 
1292         /*
1293          * We must clear NFS_INO_INVALID_DATA first to ensure that
1294          * invalidations that come in while we're shooting down the mappings
1295          * are respected. But, that leaves a race window where one revalidator
1296          * can clear the flag, and then another checks it before the mapping
1297          * gets invalidated. Fix that by serializing access to this part of
1298          * the function.
1299          *
1300          * At the same time, we need to allow other tasks to see whether we
1301          * might be in the middle of invalidating the pages, so we only set
1302          * the bit lock here if it looks like we're going to be doing that.
1303          */
1304         for (;;) {
1305                 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1306                                          nfs_wait_bit_killable, TASK_KILLABLE);
1307                 if (ret)
1308                         goto out;
1309                 spin_lock(&inode->i_lock);
1310                 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1311                         spin_unlock(&inode->i_lock);
1312                         continue;
1313                 }
1314                 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1315                         break;
1316                 spin_unlock(&inode->i_lock);
1317                 goto out;
1318         }
1319 
1320         set_bit(NFS_INO_INVALIDATING, bitlock);
1321         smp_wmb();
1322         nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1323                         NFS_INO_DATA_INVAL_DEFER);
1324         spin_unlock(&inode->i_lock);
1325         trace_nfs_invalidate_mapping_enter(inode);
1326         ret = nfs_invalidate_mapping(inode, mapping);
1327         trace_nfs_invalidate_mapping_exit(inode, ret);
1328 
1329         clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1330         smp_mb__after_atomic();
1331         wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1332 out:
1333         return ret;
1334 }
1335 
1336 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1337 {
1338         struct inode *inode = &nfsi->vfs_inode;
1339 
1340         if (!S_ISREG(inode->i_mode))
1341                 return false;
1342         if (list_empty(&nfsi->open_files))
1343                 return false;
1344         return inode_is_open_for_write(inode);
1345 }
1346 
1347 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1348 {
1349         return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1350 }
1351 
1352 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1353 {
1354         struct timespec ts;
1355 
1356         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1357                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1358                         && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1359                 inode_set_iversion_raw(inode, fattr->change_attr);
1360                 if (S_ISDIR(inode->i_mode))
1361                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1362         }
1363         /* If we have atomic WCC data, we may update some attributes */
1364         ts = timespec64_to_timespec(inode->i_ctime);
1365         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1366                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1367                         && timespec_equal(&ts, &fattr->pre_ctime)) {
1368                 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1369         }
1370 
1371         ts = timespec64_to_timespec(inode->i_mtime);
1372         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1373                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1374                         && timespec_equal(&ts, &fattr->pre_mtime)) {
1375                 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1376                 if (S_ISDIR(inode->i_mode))
1377                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1378         }
1379         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1380                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1381                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1382                         && !nfs_have_writebacks(inode)) {
1383                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1384         }
1385 }
1386 
1387 /**
1388  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1389  * @inode: pointer to inode
1390  * @fattr: updated attributes
1391  *
1392  * Verifies the attribute cache. If we have just changed the attributes,
1393  * so that fattr carries weak cache consistency data, then it may
1394  * also update the ctime/mtime/change_attribute.
1395  */
1396 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1397 {
1398         struct nfs_inode *nfsi = NFS_I(inode);
1399         loff_t cur_size, new_isize;
1400         unsigned long invalid = 0;
1401         struct timespec ts;
1402 
1403         if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1404                 return 0;
1405 
1406         if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1407                 /* Only a mounted-on-fileid? Just exit */
1408                 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1409                         return 0;
1410         /* Has the inode gone and changed behind our back? */
1411         } else if (nfsi->fileid != fattr->fileid) {
1412                 /* Is this perhaps the mounted-on fileid? */
1413                 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1414                     nfsi->fileid == fattr->mounted_on_fileid)
1415                         return 0;
1416                 return -ESTALE;
1417         }
1418         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1419                 return -ESTALE;
1420 
1421 
1422         if (!nfs_file_has_buffered_writers(nfsi)) {
1423                 /* Verify a few of the more important attributes */
1424                 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1425                         invalid |= NFS_INO_INVALID_CHANGE
1426                                 | NFS_INO_REVAL_PAGECACHE;
1427 
1428                 ts = timespec64_to_timespec(inode->i_mtime);
1429                 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
1430                         invalid |= NFS_INO_INVALID_MTIME;
1431 
1432                 ts = timespec64_to_timespec(inode->i_ctime);
1433                 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
1434                         invalid |= NFS_INO_INVALID_CTIME;
1435 
1436                 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1437                         cur_size = i_size_read(inode);
1438                         new_isize = nfs_size_to_loff_t(fattr->size);
1439                         if (cur_size != new_isize)
1440                                 invalid |= NFS_INO_INVALID_SIZE
1441                                         | NFS_INO_REVAL_PAGECACHE;
1442                 }
1443         }
1444 
1445         /* Have any file permissions changed? */
1446         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1447                 invalid |= NFS_INO_INVALID_ACCESS
1448                         | NFS_INO_INVALID_ACL
1449                         | NFS_INO_INVALID_OTHER;
1450         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1451                 invalid |= NFS_INO_INVALID_ACCESS
1452                         | NFS_INO_INVALID_ACL
1453                         | NFS_INO_INVALID_OTHER;
1454         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1455                 invalid |= NFS_INO_INVALID_ACCESS
1456                         | NFS_INO_INVALID_ACL
1457                         | NFS_INO_INVALID_OTHER;
1458 
1459         /* Has the link count changed? */
1460         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1461                 invalid |= NFS_INO_INVALID_OTHER;
1462 
1463         ts = timespec64_to_timespec(inode->i_atime);
1464         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
1465                 invalid |= NFS_INO_INVALID_ATIME;
1466 
1467         if (invalid != 0)
1468                 nfs_set_cache_invalid(inode, invalid);
1469 
1470         nfsi->read_cache_jiffies = fattr->time_start;
1471         return 0;
1472 }
1473 
1474 static atomic_long_t nfs_attr_generation_counter;
1475 
1476 static unsigned long nfs_read_attr_generation_counter(void)
1477 {
1478         return atomic_long_read(&nfs_attr_generation_counter);
1479 }
1480 
1481 unsigned long nfs_inc_attr_generation_counter(void)
1482 {
1483         return atomic_long_inc_return(&nfs_attr_generation_counter);
1484 }
1485 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1486 
1487 void nfs_fattr_init(struct nfs_fattr *fattr)
1488 {
1489         fattr->valid = 0;
1490         fattr->time_start = jiffies;
1491         fattr->gencount = nfs_inc_attr_generation_counter();
1492         fattr->owner_name = NULL;
1493         fattr->group_name = NULL;
1494 }
1495 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1496 
1497 /**
1498  * nfs_fattr_set_barrier
1499  * @fattr: attributes
1500  *
1501  * Used to set a barrier after an attribute was updated. This
1502  * barrier ensures that older attributes from RPC calls that may
1503  * have raced with our update cannot clobber these new values.
1504  * Note that you are still responsible for ensuring that other
1505  * operations which change the attribute on the server do not
1506  * collide.
1507  */
1508 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1509 {
1510         fattr->gencount = nfs_inc_attr_generation_counter();
1511 }
1512 
1513 struct nfs_fattr *nfs_alloc_fattr(void)
1514 {
1515         struct nfs_fattr *fattr;
1516 
1517         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1518         if (fattr != NULL)
1519                 nfs_fattr_init(fattr);
1520         return fattr;
1521 }
1522 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1523 
1524 struct nfs_fh *nfs_alloc_fhandle(void)
1525 {
1526         struct nfs_fh *fh;
1527 
1528         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1529         if (fh != NULL)
1530                 fh->size = 0;
1531         return fh;
1532 }
1533 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1534 
1535 #ifdef NFS_DEBUG
1536 /*
1537  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1538  *                             in the same way that wireshark does
1539  *
1540  * @fh: file handle
1541  *
1542  * For debugging only.
1543  */
1544 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1545 {
1546         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1547          * not on the result */
1548         return nfs_fhandle_hash(fh);
1549 }
1550 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1551 
1552 /*
1553  * _nfs_display_fhandle - display an NFS file handle on the console
1554  *
1555  * @fh: file handle to display
1556  * @caption: display caption
1557  *
1558  * For debugging only.
1559  */
1560 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1561 {
1562         unsigned short i;
1563 
1564         if (fh == NULL || fh->size == 0) {
1565                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1566                 return;
1567         }
1568 
1569         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1570                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1571         for (i = 0; i < fh->size; i += 16) {
1572                 __be32 *pos = (__be32 *)&fh->data[i];
1573 
1574                 switch ((fh->size - i - 1) >> 2) {
1575                 case 0:
1576                         printk(KERN_DEFAULT " %08x\n",
1577                                 be32_to_cpup(pos));
1578                         break;
1579                 case 1:
1580                         printk(KERN_DEFAULT " %08x %08x\n",
1581                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1582                         break;
1583                 case 2:
1584                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1585                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1586                                 be32_to_cpup(pos + 2));
1587                         break;
1588                 default:
1589                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1590                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1591                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1592                 }
1593         }
1594 }
1595 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1596 #endif
1597 
1598 /**
1599  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1600  * @inode: pointer to inode
1601  * @fattr: attributes
1602  *
1603  * Attempt to divine whether or not an RPC call reply carrying stale
1604  * attributes got scheduled after another call carrying updated ones.
1605  *
1606  * To do so, the function first assumes that a more recent ctime means
1607  * that the attributes in fattr are newer, however it also attempt to
1608  * catch the case where ctime either didn't change, or went backwards
1609  * (if someone reset the clock on the server) by looking at whether
1610  * or not this RPC call was started after the inode was last updated.
1611  * Note also the check for wraparound of 'attr_gencount'
1612  *
1613  * The function returns 'true' if it thinks the attributes in 'fattr' are
1614  * more recent than the ones cached in the inode.
1615  *
1616  */
1617 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1618 {
1619         const struct nfs_inode *nfsi = NFS_I(inode);
1620 
1621         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1622                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1623 }
1624 
1625 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1626 {
1627         int ret;
1628 
1629         trace_nfs_refresh_inode_enter(inode);
1630 
1631         if (nfs_inode_attrs_need_update(inode, fattr))
1632                 ret = nfs_update_inode(inode, fattr);
1633         else
1634                 ret = nfs_check_inode_attributes(inode, fattr);
1635 
1636         trace_nfs_refresh_inode_exit(inode, ret);
1637         return ret;
1638 }
1639 
1640 /**
1641  * nfs_refresh_inode - try to update the inode attribute cache
1642  * @inode: pointer to inode
1643  * @fattr: updated attributes
1644  *
1645  * Check that an RPC call that returned attributes has not overlapped with
1646  * other recent updates of the inode metadata, then decide whether it is
1647  * safe to do a full update of the inode attributes, or whether just to
1648  * call nfs_check_inode_attributes.
1649  */
1650 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1651 {
1652         int status;
1653 
1654         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1655                 return 0;
1656         spin_lock(&inode->i_lock);
1657         status = nfs_refresh_inode_locked(inode, fattr);
1658         spin_unlock(&inode->i_lock);
1659 
1660         return status;
1661 }
1662 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1663 
1664 static int nfs_post_op_update_inode_locked(struct inode *inode,
1665                 struct nfs_fattr *fattr, unsigned int invalid)
1666 {
1667         if (S_ISDIR(inode->i_mode))
1668                 invalid |= NFS_INO_INVALID_DATA;
1669         nfs_set_cache_invalid(inode, invalid);
1670         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1671                 return 0;
1672         return nfs_refresh_inode_locked(inode, fattr);
1673 }
1674 
1675 /**
1676  * nfs_post_op_update_inode - try to update the inode attribute cache
1677  * @inode: pointer to inode
1678  * @fattr: updated attributes
1679  *
1680  * After an operation that has changed the inode metadata, mark the
1681  * attribute cache as being invalid, then try to update it.
1682  *
1683  * NB: if the server didn't return any post op attributes, this
1684  * function will force the retrieval of attributes before the next
1685  * NFS request.  Thus it should be used only for operations that
1686  * are expected to change one or more attributes, to avoid
1687  * unnecessary NFS requests and trips through nfs_update_inode().
1688  */
1689 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1690 {
1691         int status;
1692 
1693         spin_lock(&inode->i_lock);
1694         nfs_fattr_set_barrier(fattr);
1695         status = nfs_post_op_update_inode_locked(inode, fattr,
1696                         NFS_INO_INVALID_CHANGE
1697                         | NFS_INO_INVALID_CTIME
1698                         | NFS_INO_REVAL_FORCED);
1699         spin_unlock(&inode->i_lock);
1700 
1701         return status;
1702 }
1703 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1704 
1705 /**
1706  * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1707  * @inode: pointer to inode
1708  * @fattr: updated attributes
1709  *
1710  * After an operation that has changed the inode metadata, mark the
1711  * attribute cache as being invalid, then try to update it. Fake up
1712  * weak cache consistency data, if none exist.
1713  *
1714  * This function is mainly designed to be used by the ->write_done() functions.
1715  */
1716 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1717 {
1718         int status;
1719 
1720         /* Don't do a WCC update if these attributes are already stale */
1721         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1722                         !nfs_inode_attrs_need_update(inode, fattr)) {
1723                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1724                                 | NFS_ATTR_FATTR_PRESIZE
1725                                 | NFS_ATTR_FATTR_PREMTIME
1726                                 | NFS_ATTR_FATTR_PRECTIME);
1727                 goto out_noforce;
1728         }
1729         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1730                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1731                 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1732                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1733         }
1734         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1735                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1736                 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
1737                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1738         }
1739         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1740                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1741                 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
1742                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1743         }
1744         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1745                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1746                 fattr->pre_size = i_size_read(inode);
1747                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1748         }
1749 out_noforce:
1750         status = nfs_post_op_update_inode_locked(inode, fattr,
1751                         NFS_INO_INVALID_CHANGE
1752                         | NFS_INO_INVALID_CTIME
1753                         | NFS_INO_INVALID_MTIME);
1754         return status;
1755 }
1756 
1757 /**
1758  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1759  * @inode: pointer to inode
1760  * @fattr: updated attributes
1761  *
1762  * After an operation that has changed the inode metadata, mark the
1763  * attribute cache as being invalid, then try to update it. Fake up
1764  * weak cache consistency data, if none exist.
1765  *
1766  * This function is mainly designed to be used by the ->write_done() functions.
1767  */
1768 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1769 {
1770         int status;
1771 
1772         spin_lock(&inode->i_lock);
1773         nfs_fattr_set_barrier(fattr);
1774         status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1775         spin_unlock(&inode->i_lock);
1776         return status;
1777 }
1778 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1779 
1780 
1781 /*
1782  * Many nfs protocol calls return the new file attributes after
1783  * an operation.  Here we update the inode to reflect the state
1784  * of the server's inode.
1785  *
1786  * This is a bit tricky because we have to make sure all dirty pages
1787  * have been sent off to the server before calling invalidate_inode_pages.
1788  * To make sure no other process adds more write requests while we try
1789  * our best to flush them, we make them sleep during the attribute refresh.
1790  *
1791  * A very similar scenario holds for the dir cache.
1792  */
1793 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1794 {
1795         struct nfs_server *server;
1796         struct nfs_inode *nfsi = NFS_I(inode);
1797         loff_t cur_isize, new_isize;
1798         unsigned long invalid = 0;
1799         unsigned long now = jiffies;
1800         unsigned long save_cache_validity;
1801         bool have_writers = nfs_file_has_buffered_writers(nfsi);
1802         bool cache_revalidated = true;
1803         bool attr_changed = false;
1804         bool have_delegation;
1805 
1806         dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1807                         __func__, inode->i_sb->s_id, inode->i_ino,
1808                         nfs_display_fhandle_hash(NFS_FH(inode)),
1809                         atomic_read(&inode->i_count), fattr->valid);
1810 
1811         if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1812                 /* Only a mounted-on-fileid? Just exit */
1813                 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1814                         return 0;
1815         /* Has the inode gone and changed behind our back? */
1816         } else if (nfsi->fileid != fattr->fileid) {
1817                 /* Is this perhaps the mounted-on fileid? */
1818                 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1819                     nfsi->fileid == fattr->mounted_on_fileid)
1820                         return 0;
1821                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1822                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1823                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1824                         inode->i_sb->s_id, (long long)nfsi->fileid,
1825                         (long long)fattr->fileid);
1826                 goto out_err;
1827         }
1828 
1829         /*
1830          * Make sure the inode's type hasn't changed.
1831          */
1832         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1833                 /*
1834                 * Big trouble! The inode has become a different object.
1835                 */
1836                 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1837                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1838                 goto out_err;
1839         }
1840 
1841         server = NFS_SERVER(inode);
1842         /* Update the fsid? */
1843         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1844                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1845                         !IS_AUTOMOUNT(inode))
1846                 server->fsid = fattr->fsid;
1847 
1848         /* Save the delegation state before clearing cache_validity */
1849         have_delegation = nfs_have_delegated_attributes(inode);
1850 
1851         /*
1852          * Update the read time so we don't revalidate too often.
1853          */
1854         nfsi->read_cache_jiffies = fattr->time_start;
1855 
1856         save_cache_validity = nfsi->cache_validity;
1857         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1858                         | NFS_INO_INVALID_ATIME
1859                         | NFS_INO_REVAL_FORCED
1860                         | NFS_INO_REVAL_PAGECACHE);
1861 
1862         /* Do atomic weak cache consistency updates */
1863         nfs_wcc_update_inode(inode, fattr);
1864 
1865         if (pnfs_layoutcommit_outstanding(inode)) {
1866                 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1867                 cache_revalidated = false;
1868         }
1869 
1870         /* More cache consistency checks */
1871         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1872                 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1873                         /* Could it be a race with writeback? */
1874                         if (!(have_writers || have_delegation)) {
1875                                 invalid |= NFS_INO_INVALID_DATA
1876                                         | NFS_INO_INVALID_ACCESS
1877                                         | NFS_INO_INVALID_ACL;
1878                                 /* Force revalidate of all attributes */
1879                                 save_cache_validity |= NFS_INO_INVALID_CTIME
1880                                         | NFS_INO_INVALID_MTIME
1881                                         | NFS_INO_INVALID_SIZE
1882                                         | NFS_INO_INVALID_OTHER;
1883                                 if (S_ISDIR(inode->i_mode))
1884                                         nfs_force_lookup_revalidate(inode);
1885                                 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1886                                                 inode->i_sb->s_id,
1887                                                 inode->i_ino);
1888                         } else if (!have_delegation)
1889                                 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1890                         inode_set_iversion_raw(inode, fattr->change_attr);
1891                         attr_changed = true;
1892                 }
1893         } else {
1894                 nfsi->cache_validity |= save_cache_validity &
1895                                 (NFS_INO_INVALID_CHANGE
1896                                 | NFS_INO_REVAL_PAGECACHE
1897                                 | NFS_INO_REVAL_FORCED);
1898                 cache_revalidated = false;
1899         }
1900 
1901         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1902                 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1903         } else if (server->caps & NFS_CAP_MTIME) {
1904                 nfsi->cache_validity |= save_cache_validity &
1905                                 (NFS_INO_INVALID_MTIME
1906                                 | NFS_INO_REVAL_FORCED);
1907                 cache_revalidated = false;
1908         }
1909 
1910         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1911                 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1912         } else if (server->caps & NFS_CAP_CTIME) {
1913                 nfsi->cache_validity |= save_cache_validity &
1914                                 (NFS_INO_INVALID_CTIME
1915                                 | NFS_INO_REVAL_FORCED);
1916                 cache_revalidated = false;
1917         }
1918 
1919         /* Check if our cached file size is stale */
1920         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1921                 new_isize = nfs_size_to_loff_t(fattr->size);
1922                 cur_isize = i_size_read(inode);
1923                 if (new_isize != cur_isize && !have_delegation) {
1924                         /* Do we perhaps have any outstanding writes, or has
1925                          * the file grown beyond our last write? */
1926                         if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1927                                 i_size_write(inode, new_isize);
1928                                 if (!have_writers)
1929                                         invalid |= NFS_INO_INVALID_DATA;
1930                                 attr_changed = true;
1931                         }
1932                         dprintk("NFS: isize change on server for file %s/%ld "
1933                                         "(%Ld to %Ld)\n",
1934                                         inode->i_sb->s_id,
1935                                         inode->i_ino,
1936                                         (long long)cur_isize,
1937                                         (long long)new_isize);
1938                 }
1939         } else {
1940                 nfsi->cache_validity |= save_cache_validity &
1941                                 (NFS_INO_INVALID_SIZE
1942                                 | NFS_INO_REVAL_PAGECACHE
1943                                 | NFS_INO_REVAL_FORCED);
1944                 cache_revalidated = false;
1945         }
1946 
1947 
1948         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1949                 inode->i_atime = timespec_to_timespec64(fattr->atime);
1950         else if (server->caps & NFS_CAP_ATIME) {
1951                 nfsi->cache_validity |= save_cache_validity &
1952                                 (NFS_INO_INVALID_ATIME
1953                                 | NFS_INO_REVAL_FORCED);
1954                 cache_revalidated = false;
1955         }
1956 
1957         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1958                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1959                         umode_t newmode = inode->i_mode & S_IFMT;
1960                         newmode |= fattr->mode & S_IALLUGO;
1961                         inode->i_mode = newmode;
1962                         invalid |= NFS_INO_INVALID_ACCESS
1963                                 | NFS_INO_INVALID_ACL;
1964                         attr_changed = true;
1965                 }
1966         } else if (server->caps & NFS_CAP_MODE) {
1967                 nfsi->cache_validity |= save_cache_validity &
1968                                 (NFS_INO_INVALID_OTHER
1969                                 | NFS_INO_REVAL_FORCED);
1970                 cache_revalidated = false;
1971         }
1972 
1973         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1974                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1975                         invalid |= NFS_INO_INVALID_ACCESS
1976                                 | NFS_INO_INVALID_ACL;
1977                         inode->i_uid = fattr->uid;
1978                         attr_changed = true;
1979                 }
1980         } else if (server->caps & NFS_CAP_OWNER) {
1981                 nfsi->cache_validity |= save_cache_validity &
1982                                 (NFS_INO_INVALID_OTHER
1983                                 | NFS_INO_REVAL_FORCED);
1984                 cache_revalidated = false;
1985         }
1986 
1987         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1988                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1989                         invalid |= NFS_INO_INVALID_ACCESS
1990                                 | NFS_INO_INVALID_ACL;
1991                         inode->i_gid = fattr->gid;
1992                         attr_changed = true;
1993                 }
1994         } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1995                 nfsi->cache_validity |= save_cache_validity &
1996                                 (NFS_INO_INVALID_OTHER
1997                                 | NFS_INO_REVAL_FORCED);
1998                 cache_revalidated = false;
1999         }
2000 
2001         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2002                 if (inode->i_nlink != fattr->nlink) {
2003                         if (S_ISDIR(inode->i_mode))
2004                                 invalid |= NFS_INO_INVALID_DATA;
2005                         set_nlink(inode, fattr->nlink);
2006                         attr_changed = true;
2007                 }
2008         } else if (server->caps & NFS_CAP_NLINK) {
2009                 nfsi->cache_validity |= save_cache_validity &
2010                                 (NFS_INO_INVALID_OTHER
2011                                 | NFS_INO_REVAL_FORCED);
2012                 cache_revalidated = false;
2013         }
2014 
2015         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2016                 /*
2017                  * report the blocks in 512byte units
2018                  */
2019                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2020         } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2021                 inode->i_blocks = fattr->du.nfs2.blocks;
2022         else
2023                 cache_revalidated = false;
2024 
2025         /* Update attrtimeo value if we're out of the unstable period */
2026         if (attr_changed) {
2027                 invalid &= ~NFS_INO_INVALID_ATTR;
2028                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2029                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2030                 nfsi->attrtimeo_timestamp = now;
2031                 /* Set barrier to be more recent than all outstanding updates */
2032                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2033         } else {
2034                 if (cache_revalidated) {
2035                         if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2036                                 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2037                                 nfsi->attrtimeo <<= 1;
2038                                 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2039                                         nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2040                         }
2041                         nfsi->attrtimeo_timestamp = now;
2042                 }
2043                 /* Set the barrier to be more recent than this fattr */
2044                 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2045                         nfsi->attr_gencount = fattr->gencount;
2046         }
2047 
2048         /* Don't invalidate the data if we were to blame */
2049         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2050                                 || S_ISLNK(inode->i_mode)))
2051                 invalid &= ~NFS_INO_INVALID_DATA;
2052         nfs_set_cache_invalid(inode, invalid);
2053 
2054         return 0;
2055  out_err:
2056         /*
2057          * No need to worry about unhashing the dentry, as the
2058          * lookup validation will know that the inode is bad.
2059          * (But we fall through to invalidate the caches.)
2060          */
2061         nfs_invalidate_inode(inode);
2062         return -ESTALE;
2063 }
2064 
2065 struct inode *nfs_alloc_inode(struct super_block *sb)
2066 {
2067         struct nfs_inode *nfsi;
2068         nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2069         if (!nfsi)
2070                 return NULL;
2071         nfsi->flags = 0UL;
2072         nfsi->cache_validity = 0UL;
2073 #if IS_ENABLED(CONFIG_NFS_V4)
2074         nfsi->nfs4_acl = NULL;
2075 #endif /* CONFIG_NFS_V4 */
2076         return &nfsi->vfs_inode;
2077 }
2078 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2079 
2080 void nfs_free_inode(struct inode *inode)
2081 {
2082         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2083 }
2084 EXPORT_SYMBOL_GPL(nfs_free_inode);
2085 
2086 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2087 {
2088 #if IS_ENABLED(CONFIG_NFS_V4)
2089         INIT_LIST_HEAD(&nfsi->open_states);
2090         nfsi->delegation = NULL;
2091         init_rwsem(&nfsi->rwsem);
2092         nfsi->layout = NULL;
2093 #endif
2094 }
2095 
2096 static void init_once(void *foo)
2097 {
2098         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2099 
2100         inode_init_once(&nfsi->vfs_inode);
2101         INIT_LIST_HEAD(&nfsi->open_files);
2102         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2103         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2104         INIT_LIST_HEAD(&nfsi->commit_info.list);
2105         atomic_long_set(&nfsi->nrequests, 0);
2106         atomic_long_set(&nfsi->commit_info.ncommit, 0);
2107         atomic_set(&nfsi->commit_info.rpcs_out, 0);
2108         init_rwsem(&nfsi->rmdir_sem);
2109         mutex_init(&nfsi->commit_mutex);
2110         nfs4_init_once(nfsi);
2111 }
2112 
2113 static int __init nfs_init_inodecache(void)
2114 {
2115         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2116                                              sizeof(struct nfs_inode),
2117                                              0, (SLAB_RECLAIM_ACCOUNT|
2118                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2119                                              init_once);
2120         if (nfs_inode_cachep == NULL)
2121                 return -ENOMEM;
2122 
2123         return 0;
2124 }
2125 
2126 static void nfs_destroy_inodecache(void)
2127 {
2128         /*
2129          * Make sure all delayed rcu free inodes are flushed before we
2130          * destroy cache.
2131          */
2132         rcu_barrier();
2133         kmem_cache_destroy(nfs_inode_cachep);
2134 }
2135 
2136 struct workqueue_struct *nfsiod_workqueue;
2137 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2138 
2139 /*
2140  * start up the nfsiod workqueue
2141  */
2142 static int nfsiod_start(void)
2143 {
2144         struct workqueue_struct *wq;
2145         dprintk("RPC:       creating workqueue nfsiod\n");
2146         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2147         if (wq == NULL)
2148                 return -ENOMEM;
2149         nfsiod_workqueue = wq;
2150         return 0;
2151 }
2152 
2153 /*
2154  * Destroy the nfsiod workqueue
2155  */
2156 static void nfsiod_stop(void)
2157 {
2158         struct workqueue_struct *wq;
2159 
2160         wq = nfsiod_workqueue;
2161         if (wq == NULL)
2162                 return;
2163         nfsiod_workqueue = NULL;
2164         destroy_workqueue(wq);
2165 }
2166 
2167 unsigned int nfs_net_id;
2168 EXPORT_SYMBOL_GPL(nfs_net_id);
2169 
2170 static int nfs_net_init(struct net *net)
2171 {
2172         nfs_clients_init(net);
2173         return nfs_fs_proc_net_init(net);
2174 }
2175 
2176 static void nfs_net_exit(struct net *net)
2177 {
2178         nfs_fs_proc_net_exit(net);
2179         nfs_clients_exit(net);
2180 }
2181 
2182 static struct pernet_operations nfs_net_ops = {
2183         .init = nfs_net_init,
2184         .exit = nfs_net_exit,
2185         .id   = &nfs_net_id,
2186         .size = sizeof(struct nfs_net),
2187 };
2188 
2189 /*
2190  * Initialize NFS
2191  */
2192 static int __init init_nfs_fs(void)
2193 {
2194         int err;
2195 
2196         err = nfs_sysfs_init();
2197         if (err < 0)
2198                 goto out10;
2199 
2200         err = register_pernet_subsys(&nfs_net_ops);
2201         if (err < 0)
2202                 goto out9;
2203 
2204         err = nfs_fscache_register();
2205         if (err < 0)
2206                 goto out8;
2207 
2208         err = nfsiod_start();
2209         if (err)
2210                 goto out7;
2211 
2212         err = nfs_fs_proc_init();
2213         if (err)
2214                 goto out6;
2215 
2216         err = nfs_init_nfspagecache();
2217         if (err)
2218                 goto out5;
2219 
2220         err = nfs_init_inodecache();
2221         if (err)
2222                 goto out4;
2223 
2224         err = nfs_init_readpagecache();
2225         if (err)
2226                 goto out3;
2227 
2228         err = nfs_init_writepagecache();
2229         if (err)
2230                 goto out2;
2231 
2232         err = nfs_init_directcache();
2233         if (err)
2234                 goto out1;
2235 
2236         rpc_proc_register(&init_net, &nfs_rpcstat);
2237 
2238         err = register_nfs_fs();
2239         if (err)
2240                 goto out0;
2241 
2242         return 0;
2243 out0:
2244         rpc_proc_unregister(&init_net, "nfs");
2245         nfs_destroy_directcache();
2246 out1:
2247         nfs_destroy_writepagecache();
2248 out2:
2249         nfs_destroy_readpagecache();
2250 out3:
2251         nfs_destroy_inodecache();
2252 out4:
2253         nfs_destroy_nfspagecache();
2254 out5:
2255         nfs_fs_proc_exit();
2256 out6:
2257         nfsiod_stop();
2258 out7:
2259         nfs_fscache_unregister();
2260 out8:
2261         unregister_pernet_subsys(&nfs_net_ops);
2262 out9:
2263         nfs_sysfs_exit();
2264 out10:
2265         return err;
2266 }
2267 
2268 static void __exit exit_nfs_fs(void)
2269 {
2270         nfs_destroy_directcache();
2271         nfs_destroy_writepagecache();
2272         nfs_destroy_readpagecache();
2273         nfs_destroy_inodecache();
2274         nfs_destroy_nfspagecache();
2275         nfs_fscache_unregister();
2276         unregister_pernet_subsys(&nfs_net_ops);
2277         rpc_proc_unregister(&init_net, "nfs");
2278         unregister_nfs_fs();
2279         nfs_fs_proc_exit();
2280         nfsiod_stop();
2281         nfs_sysfs_exit();
2282 }
2283 
2284 /* Not quite true; I just maintain it */
2285 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2286 MODULE_LICENSE("GPL");
2287 module_param(enable_ino64, bool, 0644);
2288 
2289 module_init(init_nfs_fs)
2290 module_exit(exit_nfs_fs)
/* [<][>][^][v][top][bottom][index][help] */
root/fs/nfs/inode.c

DEFINITIONS
