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 */
  63static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
  64
  65static int nfs_update_inode(struct inode *, struct nfs_fattr *);
  66
  67static struct kmem_cache * nfs_inode_cachep;
  68
  69static inline unsigned long
  70nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
  71{
  72	return nfs_fileid_to_ino_t(fattr->fileid);
  73}
  74
  75static int nfs_wait_killable(int mode)
  76{
  77	freezable_schedule_unsafe();
  78	if (signal_pending_state(mode, current))
  79		return -ERESTARTSYS;
  80	return 0;
  81}
  82
  83int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
  84{
  85	return nfs_wait_killable(mode);
  86}
  87EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
  88
  89/**
  90 * nfs_compat_user_ino64 - returns the user-visible inode number
  91 * @fileid: 64-bit fileid
  92 *
  93 * This function returns a 32-bit inode number if the boot parameter
  94 * nfs.enable_ino64 is zero.
  95 */
  96u64 nfs_compat_user_ino64(u64 fileid)
  97{
  98#ifdef CONFIG_COMPAT
  99	compat_ulong_t ino;
 100#else	
 101	unsigned long ino;
 102#endif
 103
 104	if (enable_ino64)
 105		return fileid;
 106	ino = fileid;
 107	if (sizeof(ino) < sizeof(fileid))
 108		ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
 109	return ino;
 110}
 111
 112int nfs_drop_inode(struct inode *inode)
 113{
 114	return NFS_STALE(inode) || generic_drop_inode(inode);
 115}
 116EXPORT_SYMBOL_GPL(nfs_drop_inode);
 117
 118void nfs_clear_inode(struct inode *inode)
 119{
 120	/*
 121	 * The following should never happen...
 122	 */
 123	WARN_ON_ONCE(nfs_have_writebacks(inode));
 124	WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
 125	nfs_zap_acl_cache(inode);
 126	nfs_access_zap_cache(inode);
 127	nfs_fscache_clear_inode(inode);
 128}
 129EXPORT_SYMBOL_GPL(nfs_clear_inode);
 130
 131void nfs_evict_inode(struct inode *inode)
 132{
 133	truncate_inode_pages_final(&inode->i_data);
 134	clear_inode(inode);
 135	nfs_clear_inode(inode);
 136}
 137
 138int nfs_sync_inode(struct inode *inode)
 139{
 140	inode_dio_wait(inode);
 141	return nfs_wb_all(inode);
 142}
 143EXPORT_SYMBOL_GPL(nfs_sync_inode);
 144
 145/**
 146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
 147 * @mapping: pointer to struct address_space
 148 */
 149int nfs_sync_mapping(struct address_space *mapping)
 150{
 151	int ret = 0;
 152
 153	if (mapping->nrpages != 0) {
 154		unmap_mapping_range(mapping, 0, 0, 0);
 155		ret = nfs_wb_all(mapping->host);
 156	}
 157	return ret;
 158}
 159
 160static int nfs_attribute_timeout(struct inode *inode)
 161{
 162	struct nfs_inode *nfsi = NFS_I(inode);
 163
 164	return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
 165}
 166
 167static bool nfs_check_cache_flags_invalid(struct inode *inode,
 168					  unsigned long flags)
 169{
 170	unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 171
 172	return (cache_validity & flags) != 0;
 173}
 174
 175bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
 176{
 177	if (nfs_check_cache_flags_invalid(inode, flags))
 178		return true;
 179	return nfs_attribute_cache_expired(inode);
 180}
 181EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
 182
 183#ifdef CONFIG_NFS_V4_2
 184static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
 185{
 186	return nfsi->xattr_cache != NULL;
 187}
 188#else
 189static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
 190{
 191	return false;
 192}
 193#endif
 194
 195void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
 196{
 197	struct nfs_inode *nfsi = NFS_I(inode);
 198	bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
 199
 200	if (have_delegation) {
 201		if (!(flags & NFS_INO_REVAL_FORCED))
 202			flags &= ~(NFS_INO_INVALID_MODE |
 203				   NFS_INO_INVALID_OTHER |
 204				   NFS_INO_INVALID_XATTR);
 205		flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
 206	} else if (flags & NFS_INO_REVAL_PAGECACHE)
 207		flags |= NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE;
 208
 209	if (!nfs_has_xattr_cache(nfsi))
 210		flags &= ~NFS_INO_INVALID_XATTR;
 211	if (flags & NFS_INO_INVALID_DATA)
 212		nfs_fscache_invalidate(inode);
 213	if (inode->i_mapping->nrpages == 0)
 214		flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
 215	flags &= ~(NFS_INO_REVAL_PAGECACHE | NFS_INO_REVAL_FORCED);
 216	nfsi->cache_validity |= flags;
 
 
 
 
 
 
 
 217}
 218EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
 219
 220/*
 221 * Invalidate the local caches
 222 */
 223static void nfs_zap_caches_locked(struct inode *inode)
 224{
 225	struct nfs_inode *nfsi = NFS_I(inode);
 226	int mode = inode->i_mode;
 227
 228	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 229
 230	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 231	nfsi->attrtimeo_timestamp = jiffies;
 232
 233	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
 234		nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
 235					| NFS_INO_INVALID_DATA
 236					| NFS_INO_INVALID_ACCESS
 237					| NFS_INO_INVALID_ACL
 238					| NFS_INO_INVALID_XATTR
 239					| NFS_INO_REVAL_PAGECACHE);
 240	} else
 241		nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
 242					| NFS_INO_INVALID_ACCESS
 243					| NFS_INO_INVALID_ACL
 244					| NFS_INO_INVALID_XATTR
 245					| NFS_INO_REVAL_PAGECACHE);
 246	nfs_zap_label_cache_locked(nfsi);
 247}
 248
 249void nfs_zap_caches(struct inode *inode)
 250{
 251	spin_lock(&inode->i_lock);
 252	nfs_zap_caches_locked(inode);
 253	spin_unlock(&inode->i_lock);
 254}
 255
 256void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
 257{
 258	if (mapping->nrpages != 0) {
 259		spin_lock(&inode->i_lock);
 260		nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
 261		spin_unlock(&inode->i_lock);
 262	}
 263}
 264
 265void nfs_zap_acl_cache(struct inode *inode)
 266{
 267	void (*clear_acl_cache)(struct inode *);
 268
 269	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
 270	if (clear_acl_cache != NULL)
 271		clear_acl_cache(inode);
 272	spin_lock(&inode->i_lock);
 273	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
 274	spin_unlock(&inode->i_lock);
 275}
 276EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
 277
 278void nfs_invalidate_atime(struct inode *inode)
 279{
 280	spin_lock(&inode->i_lock);
 281	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 282	spin_unlock(&inode->i_lock);
 283}
 284EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
 285
 286/*
 287 * Invalidate, but do not unhash, the inode.
 288 * NB: must be called with inode->i_lock held!
 289 */
 290static void nfs_set_inode_stale_locked(struct inode *inode)
 291{
 292	set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 293	nfs_zap_caches_locked(inode);
 294	trace_nfs_set_inode_stale(inode);
 295}
 296
 297void nfs_set_inode_stale(struct inode *inode)
 298{
 299	spin_lock(&inode->i_lock);
 300	nfs_set_inode_stale_locked(inode);
 301	spin_unlock(&inode->i_lock);
 302}
 303
 304struct nfs_find_desc {
 305	struct nfs_fh		*fh;
 306	struct nfs_fattr	*fattr;
 307};
 308
 309/*
 310 * In NFSv3 we can have 64bit inode numbers. In order to support
 311 * this, and re-exported directories (also seen in NFSv2)
 312 * we are forced to allow 2 different inodes to have the same
 313 * i_ino.
 314 */
 315static int
 316nfs_find_actor(struct inode *inode, void *opaque)
 317{
 318	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
 319	struct nfs_fh		*fh = desc->fh;
 320	struct nfs_fattr	*fattr = desc->fattr;
 321
 322	if (NFS_FILEID(inode) != fattr->fileid)
 323		return 0;
 324	if (inode_wrong_type(inode, fattr->mode))
 325		return 0;
 326	if (nfs_compare_fh(NFS_FH(inode), fh))
 327		return 0;
 328	if (is_bad_inode(inode) || NFS_STALE(inode))
 329		return 0;
 330	return 1;
 331}
 332
 333static int
 334nfs_init_locked(struct inode *inode, void *opaque)
 335{
 336	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
 337	struct nfs_fattr	*fattr = desc->fattr;
 338
 339	set_nfs_fileid(inode, fattr->fileid);
 340	inode->i_mode = fattr->mode;
 341	nfs_copy_fh(NFS_FH(inode), desc->fh);
 342	return 0;
 343}
 344
 345#ifdef CONFIG_NFS_V4_SECURITY_LABEL
 346static void nfs_clear_label_invalid(struct inode *inode)
 347{
 348	spin_lock(&inode->i_lock);
 349	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
 350	spin_unlock(&inode->i_lock);
 351}
 352
 353void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 354					struct nfs4_label *label)
 355{
 356	int error;
 357
 358	if (label == NULL)
 359		return;
 360
 361	if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
 362		error = security_inode_notifysecctx(inode, label->label,
 363				label->len);
 364		if (error)
 365			printk(KERN_ERR "%s() %s %d "
 366					"security_inode_notifysecctx() %d\n",
 367					__func__,
 368					(char *)label->label,
 369					label->len, error);
 370		nfs_clear_label_invalid(inode);
 371	}
 372}
 373
 374struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
 375{
 376	struct nfs4_label *label = NULL;
 377	int minor_version = server->nfs_client->cl_minorversion;
 378
 379	if (minor_version < 2)
 380		return label;
 381
 382	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
 383		return label;
 384
 385	label = kzalloc(sizeof(struct nfs4_label), flags);
 386	if (label == NULL)
 387		return ERR_PTR(-ENOMEM);
 388
 389	label->label = kzalloc(NFS4_MAXLABELLEN, flags);
 390	if (label->label == NULL) {
 391		kfree(label);
 392		return ERR_PTR(-ENOMEM);
 393	}
 394	label->len = NFS4_MAXLABELLEN;
 395
 396	return label;
 397}
 398EXPORT_SYMBOL_GPL(nfs4_label_alloc);
 399#else
 400void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 401					struct nfs4_label *label)
 402{
 403}
 404#endif
 405EXPORT_SYMBOL_GPL(nfs_setsecurity);
 406
 407/* Search for inode identified by fh, fileid and i_mode in inode cache. */
 408struct inode *
 409nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
 410{
 411	struct nfs_find_desc desc = {
 412		.fh	= fh,
 413		.fattr	= fattr,
 414	};
 415	struct inode *inode;
 416	unsigned long hash;
 417
 418	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
 419	    !(fattr->valid & NFS_ATTR_FATTR_TYPE))
 420		return NULL;
 421
 422	hash = nfs_fattr_to_ino_t(fattr);
 423	inode = ilookup5(sb, hash, nfs_find_actor, &desc);
 424
 425	dprintk("%s: returning %p\n", __func__, inode);
 426	return inode;
 427}
 428
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 429/*
 430 * This is our front-end to iget that looks up inodes by file handle
 431 * instead of inode number.
 432 */
 433struct inode *
 434nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
 435{
 436	struct nfs_find_desc desc = {
 437		.fh	= fh,
 438		.fattr	= fattr
 439	};
 440	struct inode *inode = ERR_PTR(-ENOENT);
 441	u64 fattr_supported = NFS_SB(sb)->fattr_valid;
 442	unsigned long hash;
 443
 444	nfs_attr_check_mountpoint(sb, fattr);
 445
 446	if (nfs_attr_use_mounted_on_fileid(fattr))
 447		fattr->fileid = fattr->mounted_on_fileid;
 448	else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
 449		goto out_no_inode;
 450	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
 451		goto out_no_inode;
 452
 453	hash = nfs_fattr_to_ino_t(fattr);
 454
 455	inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
 456	if (inode == NULL) {
 457		inode = ERR_PTR(-ENOMEM);
 458		goto out_no_inode;
 459	}
 460
 461	if (inode->i_state & I_NEW) {
 462		struct nfs_inode *nfsi = NFS_I(inode);
 463		unsigned long now = jiffies;
 464
 465		/* We set i_ino for the few things that still rely on it,
 466		 * such as stat(2) */
 467		inode->i_ino = hash;
 468
 469		/* We can't support update_atime(), since the server will reset it */
 470		inode->i_flags |= S_NOATIME|S_NOCMTIME;
 471		inode->i_mode = fattr->mode;
 472		nfsi->cache_validity = 0;
 473		if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
 474				&& (fattr_supported & NFS_ATTR_FATTR_MODE))
 475			nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
 476		/* Why so? Because we want revalidate for devices/FIFOs, and
 477		 * that's precisely what we have in nfs_file_inode_operations.
 478		 */
 479		inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
 480		if (S_ISREG(inode->i_mode)) {
 481			inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
 482			inode->i_data.a_ops = &nfs_file_aops;
 
 483		} else if (S_ISDIR(inode->i_mode)) {
 484			inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
 485			inode->i_fop = &nfs_dir_operations;
 486			inode->i_data.a_ops = &nfs_dir_aops;
 
 487			/* Deal with crossing mountpoints */
 488			if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
 489					fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
 490				if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
 491					inode->i_op = &nfs_referral_inode_operations;
 492				else
 493					inode->i_op = &nfs_mountpoint_inode_operations;
 494				inode->i_fop = NULL;
 495				inode->i_flags |= S_AUTOMOUNT;
 496			}
 497		} else if (S_ISLNK(inode->i_mode)) {
 498			inode->i_op = &nfs_symlink_inode_operations;
 499			inode_nohighmem(inode);
 500		} else
 501			init_special_inode(inode, inode->i_mode, fattr->rdev);
 502
 503		memset(&inode->i_atime, 0, sizeof(inode->i_atime));
 504		memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
 505		memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
 506		inode_set_iversion_raw(inode, 0);
 507		inode->i_size = 0;
 508		clear_nlink(inode);
 509		inode->i_uid = make_kuid(&init_user_ns, -2);
 510		inode->i_gid = make_kgid(&init_user_ns, -2);
 511		inode->i_blocks = 0;
 512		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 513		nfsi->write_io = 0;
 514		nfsi->read_io = 0;
 515
 516		nfsi->read_cache_jiffies = fattr->time_start;
 517		nfsi->attr_gencount = fattr->gencount;
 518		if (fattr->valid & NFS_ATTR_FATTR_ATIME)
 519			inode->i_atime = fattr->atime;
 520		else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
 521			nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 522		if (fattr->valid & NFS_ATTR_FATTR_MTIME)
 523			inode->i_mtime = fattr->mtime;
 524		else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
 525			nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 526		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 527			inode->i_ctime = fattr->ctime;
 528		else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
 529			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
 530		if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
 531			inode_set_iversion_raw(inode, fattr->change_attr);
 532		else
 533			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
 534		if (fattr->valid & NFS_ATTR_FATTR_SIZE)
 535			inode->i_size = nfs_size_to_loff_t(fattr->size);
 536		else
 537			nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
 538		if (fattr->valid & NFS_ATTR_FATTR_NLINK)
 539			set_nlink(inode, fattr->nlink);
 540		else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
 541			nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
 542		if (fattr->valid & NFS_ATTR_FATTR_OWNER)
 543			inode->i_uid = fattr->uid;
 544		else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
 545			nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 546		if (fattr->valid & NFS_ATTR_FATTR_GROUP)
 547			inode->i_gid = fattr->gid;
 548		else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
 549			nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 550		if (nfs_server_capable(inode, NFS_CAP_XATTR))
 551			nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
 552		if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
 553			inode->i_blocks = fattr->du.nfs2.blocks;
 554		else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
 555			 fattr->size != 0)
 556			nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
 557		if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
 558			/*
 559			 * report the blocks in 512byte units
 560			 */
 561			inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
 562		} else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
 563			   fattr->size != 0)
 564			nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
 565
 566		nfs_setsecurity(inode, fattr, label);
 567
 568		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 569		nfsi->attrtimeo_timestamp = now;
 570		nfsi->access_cache = RB_ROOT;
 571
 572		nfs_fscache_init_inode(inode);
 573
 574		unlock_new_inode(inode);
 575	} else {
 576		int err = nfs_refresh_inode(inode, fattr);
 577		if (err < 0) {
 578			iput(inode);
 579			inode = ERR_PTR(err);
 580			goto out_no_inode;
 581		}
 582	}
 583	dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
 584		inode->i_sb->s_id,
 585		(unsigned long long)NFS_FILEID(inode),
 586		nfs_display_fhandle_hash(fh),
 587		atomic_read(&inode->i_count));
 588
 589out:
 590	return inode;
 591
 592out_no_inode:
 593	dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
 594	goto out;
 595}
 596EXPORT_SYMBOL_GPL(nfs_fhget);
 597
 598#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)
 599
 600int
 601nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 602	    struct iattr *attr)
 603{
 604	struct inode *inode = d_inode(dentry);
 605	struct nfs_fattr *fattr;
 606	int error = 0;
 607
 608	nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
 609
 610	/* skip mode change if it's just for clearing setuid/setgid */
 611	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 612		attr->ia_valid &= ~ATTR_MODE;
 613
 614	if (attr->ia_valid & ATTR_SIZE) {
 615		BUG_ON(!S_ISREG(inode->i_mode));
 616
 617		error = inode_newsize_ok(inode, attr->ia_size);
 618		if (error)
 619			return error;
 620
 621		if (attr->ia_size == i_size_read(inode))
 622			attr->ia_valid &= ~ATTR_SIZE;
 623	}
 624
 625	/* Optimization: if the end result is no change, don't RPC */
 626	if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
 627		return 0;
 628
 629	trace_nfs_setattr_enter(inode);
 630
 631	/* Write all dirty data */
 632	if (S_ISREG(inode->i_mode))
 633		nfs_sync_inode(inode);
 634
 635	fattr = nfs_alloc_fattr();
 636	if (fattr == NULL) {
 637		error = -ENOMEM;
 638		goto out;
 639	}
 640
 641	error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
 642	if (error == 0)
 643		error = nfs_refresh_inode(inode, fattr);
 644	nfs_free_fattr(fattr);
 645out:
 646	trace_nfs_setattr_exit(inode, error);
 647	return error;
 648}
 649EXPORT_SYMBOL_GPL(nfs_setattr);
 650
 651/**
 652 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
 653 * @inode: inode of the file used
 654 * @offset: file offset to start truncating
 655 *
 656 * This is a copy of the common vmtruncate, but with the locking
 657 * corrected to take into account the fact that NFS requires
 658 * inode->i_size to be updated under the inode->i_lock.
 659 * Note: must be called with inode->i_lock held!
 660 */
 661static int nfs_vmtruncate(struct inode * inode, loff_t offset)
 662{
 663	int err;
 664
 665	err = inode_newsize_ok(inode, offset);
 666	if (err)
 667		goto out;
 668
 
 669	i_size_write(inode, offset);
 670	/* Optimisation */
 671	if (offset == 0)
 672		NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
 673				NFS_INO_DATA_INVAL_DEFER);
 674	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
 675
 676	spin_unlock(&inode->i_lock);
 677	truncate_pagecache(inode, offset);
 678	spin_lock(&inode->i_lock);
 679out:
 680	return err;
 681}
 682
 683/**
 684 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 685 * @inode: pointer to struct inode
 686 * @attr: pointer to struct iattr
 687 * @fattr: pointer to struct nfs_fattr
 688 *
 689 * Note: we do this in the *proc.c in order to ensure that
 690 *       it works for things like exclusive creates too.
 691 */
 692void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
 693		struct nfs_fattr *fattr)
 694{
 695	/* Barrier: bump the attribute generation count. */
 696	nfs_fattr_set_barrier(fattr);
 697
 698	spin_lock(&inode->i_lock);
 699	NFS_I(inode)->attr_gencount = fattr->gencount;
 700	if ((attr->ia_valid & ATTR_SIZE) != 0) {
 701		nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
 702						     NFS_INO_INVALID_BLOCKS);
 703		nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
 704		nfs_vmtruncate(inode, attr->ia_size);
 705	}
 706	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
 707		NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
 708		if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
 709		    inode->i_mode & S_ISUID)
 710			inode->i_mode &= ~S_ISUID;
 711		if ((attr->ia_valid & ATTR_KILL_SGID) != 0 &&
 712		    (inode->i_mode & (S_ISGID | S_IXGRP)) ==
 713		     (S_ISGID | S_IXGRP))
 714			inode->i_mode &= ~S_ISGID;
 715		if ((attr->ia_valid & ATTR_MODE) != 0) {
 716			int mode = attr->ia_mode & S_IALLUGO;
 717			mode |= inode->i_mode & ~S_IALLUGO;
 718			inode->i_mode = mode;
 719		}
 720		if ((attr->ia_valid & ATTR_UID) != 0)
 721			inode->i_uid = attr->ia_uid;
 722		if ((attr->ia_valid & ATTR_GID) != 0)
 723			inode->i_gid = attr->ia_gid;
 724		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 725			inode->i_ctime = fattr->ctime;
 726		else
 727			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 728					| NFS_INO_INVALID_CTIME);
 729		nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
 730				| NFS_INO_INVALID_ACL);
 731	}
 732	if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
 733		NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
 734				| NFS_INO_INVALID_CTIME);
 735		if (fattr->valid & NFS_ATTR_FATTR_ATIME)
 736			inode->i_atime = fattr->atime;
 737		else if (attr->ia_valid & ATTR_ATIME_SET)
 738			inode->i_atime = attr->ia_atime;
 739		else
 740			nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 741
 742		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 743			inode->i_ctime = fattr->ctime;
 744		else
 745			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 746					| NFS_INO_INVALID_CTIME);
 747	}
 748	if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
 749		NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
 750				| NFS_INO_INVALID_CTIME);
 751		if (fattr->valid & NFS_ATTR_FATTR_MTIME)
 752			inode->i_mtime = fattr->mtime;
 753		else if (attr->ia_valid & ATTR_MTIME_SET)
 754			inode->i_mtime = attr->ia_mtime;
 755		else
 756			nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 757
 758		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 759			inode->i_ctime = fattr->ctime;
 760		else
 761			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 762					| NFS_INO_INVALID_CTIME);
 763	}
 764	if (fattr->valid)
 765		nfs_update_inode(inode, fattr);
 766	spin_unlock(&inode->i_lock);
 767}
 768EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
 769
 770static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
 
 
 
 
 771{
 772	struct dentry *parent;
 
 
 773
 774	if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
 775		return;
 776	parent = dget_parent(dentry);
 777	nfs_force_use_readdirplus(d_inode(parent));
 778	dput(parent);
 
 
 779}
 780
 781static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
 782{
 783	struct dentry *parent;
 784
 785	if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
 786		return;
 787	parent = dget_parent(dentry);
 788	nfs_advise_use_readdirplus(d_inode(parent));
 789	dput(parent);
 790}
 791
 792static u32 nfs_get_valid_attrmask(struct inode *inode)
 793{
 794	unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 795	u32 reply_mask = STATX_INO | STATX_TYPE;
 796
 797	if (!(cache_validity & NFS_INO_INVALID_ATIME))
 798		reply_mask |= STATX_ATIME;
 799	if (!(cache_validity & NFS_INO_INVALID_CTIME))
 800		reply_mask |= STATX_CTIME;
 801	if (!(cache_validity & NFS_INO_INVALID_MTIME))
 802		reply_mask |= STATX_MTIME;
 803	if (!(cache_validity & NFS_INO_INVALID_SIZE))
 804		reply_mask |= STATX_SIZE;
 805	if (!(cache_validity & NFS_INO_INVALID_NLINK))
 806		reply_mask |= STATX_NLINK;
 807	if (!(cache_validity & NFS_INO_INVALID_MODE))
 808		reply_mask |= STATX_MODE;
 809	if (!(cache_validity & NFS_INO_INVALID_OTHER))
 810		reply_mask |= STATX_UID | STATX_GID;
 811	if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
 812		reply_mask |= STATX_BLOCKS;
 813	return reply_mask;
 814}
 815
 816int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 817		struct kstat *stat, u32 request_mask, unsigned int query_flags)
 818{
 819	struct inode *inode = d_inode(path->dentry);
 820	struct nfs_server *server = NFS_SERVER(inode);
 821	unsigned long cache_validity;
 822	int err = 0;
 823	bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
 824	bool do_update = false;
 
 825
 826	trace_nfs_getattr_enter(inode);
 827
 828	request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
 829			STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
 830			STATX_INO | STATX_SIZE | STATX_BLOCKS;
 831
 832	if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
 833		nfs_readdirplus_parent_cache_hit(path->dentry);
 
 834		goto out_no_revalidate;
 835	}
 836
 837	/* Flush out writes to the server in order to update c/mtime.  */
 838	if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
 839			S_ISREG(inode->i_mode)) {
 840		err = filemap_write_and_wait(inode->i_mapping);
 841		if (err)
 842			goto out;
 843	}
 844
 845	/*
 846	 * We may force a getattr if the user cares about atime.
 847	 *
 848	 * Note that we only have to check the vfsmount flags here:
 849	 *  - NFS always sets S_NOATIME by so checking it would give a
 850	 *    bogus result
 851	 *  - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
 852	 *    no point in checking those.
 853	 */
 854	if ((path->mnt->mnt_flags & MNT_NOATIME) ||
 855	    ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 856		request_mask &= ~STATX_ATIME;
 857
 858	/* Is the user requesting attributes that might need revalidation? */
 859	if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
 860					STATX_MTIME|STATX_UID|STATX_GID|
 861					STATX_SIZE|STATX_BLOCKS)))
 862		goto out_no_revalidate;
 863
 864	/* Check whether the cached attributes are stale */
 865	do_update |= force_sync || nfs_attribute_cache_expired(inode);
 866	cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 867	do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
 868	if (request_mask & STATX_ATIME)
 869		do_update |= cache_validity & NFS_INO_INVALID_ATIME;
 870	if (request_mask & STATX_CTIME)
 871		do_update |= cache_validity & NFS_INO_INVALID_CTIME;
 872	if (request_mask & STATX_MTIME)
 873		do_update |= cache_validity & NFS_INO_INVALID_MTIME;
 874	if (request_mask & STATX_SIZE)
 875		do_update |= cache_validity & NFS_INO_INVALID_SIZE;
 876	if (request_mask & STATX_NLINK)
 877		do_update |= cache_validity & NFS_INO_INVALID_NLINK;
 878	if (request_mask & STATX_MODE)
 879		do_update |= cache_validity & NFS_INO_INVALID_MODE;
 880	if (request_mask & (STATX_UID | STATX_GID))
 881		do_update |= cache_validity & NFS_INO_INVALID_OTHER;
 882	if (request_mask & STATX_BLOCKS)
 883		do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
 884
 885	if (do_update) {
 886		/* Update the attribute cache */
 887		if (!(server->flags & NFS_MOUNT_NOAC))
 888			nfs_readdirplus_parent_cache_miss(path->dentry);
 889		else
 890			nfs_readdirplus_parent_cache_hit(path->dentry);
 891		err = __nfs_revalidate_inode(server, inode);
 892		if (err)
 893			goto out;
 894	} else
 895		nfs_readdirplus_parent_cache_hit(path->dentry);
 896out_no_revalidate:
 897	/* Only return attributes that were revalidated. */
 898	stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
 899
 900	generic_fillattr(&init_user_ns, inode, stat);
 901	stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
 902	if (S_ISDIR(inode->i_mode))
 903		stat->blksize = NFS_SERVER(inode)->dtsize;
 904out:
 905	trace_nfs_getattr_exit(inode, err);
 906	return err;
 907}
 908EXPORT_SYMBOL_GPL(nfs_getattr);
 909
 910static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
 911{
 912	refcount_set(&l_ctx->count, 1);
 913	l_ctx->lockowner = current->files;
 914	INIT_LIST_HEAD(&l_ctx->list);
 915	atomic_set(&l_ctx->io_count, 0);
 916}
 917
 918static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
 919{
 920	struct nfs_lock_context *pos;
 921
 922	list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
 923		if (pos->lockowner != current->files)
 924			continue;
 925		if (refcount_inc_not_zero(&pos->count))
 926			return pos;
 927	}
 928	return NULL;
 929}
 930
 931struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
 932{
 933	struct nfs_lock_context *res, *new = NULL;
 934	struct inode *inode = d_inode(ctx->dentry);
 935
 936	rcu_read_lock();
 937	res = __nfs_find_lock_context(ctx);
 938	rcu_read_unlock();
 939	if (res == NULL) {
 940		new = kmalloc(sizeof(*new), GFP_KERNEL);
 941		if (new == NULL)
 942			return ERR_PTR(-ENOMEM);
 943		nfs_init_lock_context(new);
 944		spin_lock(&inode->i_lock);
 945		res = __nfs_find_lock_context(ctx);
 946		if (res == NULL) {
 947			new->open_context = get_nfs_open_context(ctx);
 948			if (new->open_context) {
 949				list_add_tail_rcu(&new->list,
 950						&ctx->lock_context.list);
 951				res = new;
 952				new = NULL;
 953			} else
 954				res = ERR_PTR(-EBADF);
 955		}
 956		spin_unlock(&inode->i_lock);
 957		kfree(new);
 958	}
 959	return res;
 960}
 961EXPORT_SYMBOL_GPL(nfs_get_lock_context);
 962
 963void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
 964{
 965	struct nfs_open_context *ctx = l_ctx->open_context;
 966	struct inode *inode = d_inode(ctx->dentry);
 967
 968	if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
 969		return;
 970	list_del_rcu(&l_ctx->list);
 971	spin_unlock(&inode->i_lock);
 972	put_nfs_open_context(ctx);
 973	kfree_rcu(l_ctx, rcu_head);
 974}
 975EXPORT_SYMBOL_GPL(nfs_put_lock_context);
 976
 977/**
 978 * nfs_close_context - Common close_context() routine NFSv2/v3
 979 * @ctx: pointer to context
 980 * @is_sync: is this a synchronous close
 981 *
 982 * Ensure that the attributes are up to date if we're mounted
 983 * with close-to-open semantics and we have cached data that will
 984 * need to be revalidated on open.
 985 */
 986void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
 987{
 988	struct nfs_inode *nfsi;
 989	struct inode *inode;
 990
 991	if (!(ctx->mode & FMODE_WRITE))
 992		return;
 993	if (!is_sync)
 994		return;
 995	inode = d_inode(ctx->dentry);
 996	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
 997		return;
 998	nfsi = NFS_I(inode);
 999	if (inode->i_mapping->nrpages == 0)
1000		return;
1001	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1002		return;
1003	if (!list_empty(&nfsi->open_files))
1004		return;
1005	if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1006		return;
1007	nfs_revalidate_inode(inode,
1008			     NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1009}
1010EXPORT_SYMBOL_GPL(nfs_close_context);
1011
1012struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1013						fmode_t f_mode,
1014						struct file *filp)
1015{
1016	struct nfs_open_context *ctx;
1017
1018	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1019	if (!ctx)
1020		return ERR_PTR(-ENOMEM);
1021	nfs_sb_active(dentry->d_sb);
1022	ctx->dentry = dget(dentry);
1023	if (filp)
1024		ctx->cred = get_cred(filp->f_cred);
1025	else
1026		ctx->cred = get_current_cred();
1027	ctx->ll_cred = NULL;
1028	ctx->state = NULL;
1029	ctx->mode = f_mode;
1030	ctx->flags = 0;
1031	ctx->error = 0;
1032	ctx->flock_owner = (fl_owner_t)filp;
1033	nfs_init_lock_context(&ctx->lock_context);
1034	ctx->lock_context.open_context = ctx;
1035	INIT_LIST_HEAD(&ctx->list);
1036	ctx->mdsthreshold = NULL;
1037	return ctx;
1038}
1039EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1040
1041struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1042{
1043	if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1044		return ctx;
1045	return NULL;
1046}
1047EXPORT_SYMBOL_GPL(get_nfs_open_context);
1048
1049static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1050{
1051	struct inode *inode = d_inode(ctx->dentry);
1052	struct super_block *sb = ctx->dentry->d_sb;
1053
1054	if (!refcount_dec_and_test(&ctx->lock_context.count))
1055		return;
1056	if (!list_empty(&ctx->list)) {
1057		spin_lock(&inode->i_lock);
1058		list_del_rcu(&ctx->list);
1059		spin_unlock(&inode->i_lock);
1060	}
1061	if (inode != NULL)
1062		NFS_PROTO(inode)->close_context(ctx, is_sync);
1063	put_cred(ctx->cred);
1064	dput(ctx->dentry);
1065	nfs_sb_deactive(sb);
1066	put_rpccred(ctx->ll_cred);
1067	kfree(ctx->mdsthreshold);
1068	kfree_rcu(ctx, rcu_head);
1069}
1070
1071void put_nfs_open_context(struct nfs_open_context *ctx)
1072{
1073	__put_nfs_open_context(ctx, 0);
1074}
1075EXPORT_SYMBOL_GPL(put_nfs_open_context);
1076
1077static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1078{
1079	__put_nfs_open_context(ctx, 1);
1080}
1081
1082/*
1083 * Ensure that mmap has a recent RPC credential for use when writing out
1084 * shared pages
1085 */
1086void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1087{
1088	struct inode *inode = d_inode(ctx->dentry);
1089	struct nfs_inode *nfsi = NFS_I(inode);
1090
1091	spin_lock(&inode->i_lock);
1092	if (list_empty(&nfsi->open_files) &&
1093	    (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1094		nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1095						     NFS_INO_REVAL_FORCED);
1096	list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1097	spin_unlock(&inode->i_lock);
1098}
1099EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1100
1101void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1102{
1103	filp->private_data = get_nfs_open_context(ctx);
1104	set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1105	if (list_empty(&ctx->list))
1106		nfs_inode_attach_open_context(ctx);
1107}
1108EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1109
1110/*
1111 * Given an inode, search for an open context with the desired characteristics
1112 */
1113struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1114{
1115	struct nfs_inode *nfsi = NFS_I(inode);
1116	struct nfs_open_context *pos, *ctx = NULL;
1117
1118	rcu_read_lock();
1119	list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1120		if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1121			continue;
1122		if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1123			continue;
1124		if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1125			continue;
1126		ctx = get_nfs_open_context(pos);
1127		if (ctx)
1128			break;
1129	}
1130	rcu_read_unlock();
1131	return ctx;
1132}
1133
1134void nfs_file_clear_open_context(struct file *filp)
1135{
1136	struct nfs_open_context *ctx = nfs_file_open_context(filp);
1137
1138	if (ctx) {
1139		struct inode *inode = d_inode(ctx->dentry);
1140
1141		clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1142		/*
1143		 * We fatal error on write before. Try to writeback
1144		 * every page again.
1145		 */
1146		if (ctx->error < 0)
1147			invalidate_inode_pages2(inode->i_mapping);
1148		filp->private_data = NULL;
1149		put_nfs_open_context_sync(ctx);
1150	}
1151}
1152
1153/*
1154 * These allocate and release file read/write context information.
1155 */
1156int nfs_open(struct inode *inode, struct file *filp)
1157{
1158	struct nfs_open_context *ctx;
1159
1160	ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
 
1161	if (IS_ERR(ctx))
1162		return PTR_ERR(ctx);
1163	nfs_file_set_open_context(filp, ctx);
1164	put_nfs_open_context(ctx);
1165	nfs_fscache_open_file(inode, filp);
1166	return 0;
1167}
1168EXPORT_SYMBOL_GPL(nfs_open);
1169
1170/*
1171 * This function is called whenever some part of NFS notices that
1172 * the cached attributes have to be refreshed.
1173 */
1174int
1175__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1176{
1177	int		 status = -ESTALE;
1178	struct nfs4_label *label = NULL;
1179	struct nfs_fattr *fattr = NULL;
1180	struct nfs_inode *nfsi = NFS_I(inode);
1181
1182	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1183		inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1184
1185	trace_nfs_revalidate_inode_enter(inode);
1186
1187	if (is_bad_inode(inode))
1188		goto out;
1189	if (NFS_STALE(inode))
1190		goto out;
1191
1192	/* pNFS: Attributes aren't updated until we layoutcommit */
1193	if (S_ISREG(inode->i_mode)) {
1194		status = pnfs_sync_inode(inode, false);
1195		if (status)
1196			goto out;
1197	}
1198
1199	status = -ENOMEM;
1200	fattr = nfs_alloc_fattr();
1201	if (fattr == NULL)
1202		goto out;
1203
1204	nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1205
1206	label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1207	if (IS_ERR(label)) {
1208		status = PTR_ERR(label);
1209		goto out;
1210	}
1211
1212	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1213			label, inode);
1214	if (status != 0) {
1215		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1216			 inode->i_sb->s_id,
1217			 (unsigned long long)NFS_FILEID(inode), status);
1218		switch (status) {
1219		case -ETIMEDOUT:
1220			/* A soft timeout occurred. Use cached information? */
1221			if (server->flags & NFS_MOUNT_SOFTREVAL)
1222				status = 0;
1223			break;
1224		case -ESTALE:
1225			if (!S_ISDIR(inode->i_mode))
1226				nfs_set_inode_stale(inode);
1227			else
1228				nfs_zap_caches(inode);
1229		}
1230		goto err_out;
1231	}
1232
1233	status = nfs_refresh_inode(inode, fattr);
1234	if (status) {
1235		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1236			 inode->i_sb->s_id,
1237			 (unsigned long long)NFS_FILEID(inode), status);
1238		goto err_out;
1239	}
1240
1241	if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1242		nfs_zap_acl_cache(inode);
1243
1244	nfs_setsecurity(inode, fattr, label);
1245
1246	dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1247		inode->i_sb->s_id,
1248		(unsigned long long)NFS_FILEID(inode));
1249
1250err_out:
1251	nfs4_label_free(label);
1252out:
1253	nfs_free_fattr(fattr);
1254	trace_nfs_revalidate_inode_exit(inode, status);
1255	return status;
1256}
1257
1258int nfs_attribute_cache_expired(struct inode *inode)
1259{
1260	if (nfs_have_delegated_attributes(inode))
1261		return 0;
1262	return nfs_attribute_timeout(inode);
1263}
1264
1265/**
1266 * nfs_revalidate_inode - Revalidate the inode attributes
1267 * @inode: pointer to inode struct
1268 * @flags: cache flags to check
1269 *
1270 * Updates inode attribute information by retrieving the data from the server.
1271 */
1272int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1273{
1274	if (!nfs_check_cache_invalid(inode, flags))
1275		return NFS_STALE(inode) ? -ESTALE : 0;
1276	return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1277}
1278EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1279
1280static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1281{
1282	int ret;
1283
 
1284	if (mapping->nrpages != 0) {
1285		if (S_ISREG(inode->i_mode)) {
1286			ret = nfs_sync_mapping(mapping);
1287			if (ret < 0)
1288				return ret;
1289		}
1290		ret = invalidate_inode_pages2(mapping);
1291		if (ret < 0)
1292			return ret;
1293	}
1294	nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1295	nfs_fscache_wait_on_invalidate(inode);
1296
1297	dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1298			inode->i_sb->s_id,
1299			(unsigned long long)NFS_FILEID(inode));
1300	return 0;
1301}
1302
1303/**
1304 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1305 * @mapping: pointer to mapping
1306 *
1307 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1308 */
1309int nfs_clear_invalid_mapping(struct address_space *mapping)
1310{
1311	struct inode *inode = mapping->host;
1312	struct nfs_inode *nfsi = NFS_I(inode);
1313	unsigned long *bitlock = &nfsi->flags;
1314	int ret = 0;
1315
1316	/*
1317	 * We must clear NFS_INO_INVALID_DATA first to ensure that
1318	 * invalidations that come in while we're shooting down the mappings
1319	 * are respected. But, that leaves a race window where one revalidator
1320	 * can clear the flag, and then another checks it before the mapping
1321	 * gets invalidated. Fix that by serializing access to this part of
1322	 * the function.
1323	 *
1324	 * At the same time, we need to allow other tasks to see whether we
1325	 * might be in the middle of invalidating the pages, so we only set
1326	 * the bit lock here if it looks like we're going to be doing that.
1327	 */
1328	for (;;) {
1329		ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1330					 nfs_wait_bit_killable, TASK_KILLABLE);
 
1331		if (ret)
1332			goto out;
1333		spin_lock(&inode->i_lock);
1334		if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1335			spin_unlock(&inode->i_lock);
1336			continue;
1337		}
1338		if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1339			break;
1340		spin_unlock(&inode->i_lock);
1341		goto out;
1342	}
1343
1344	set_bit(NFS_INO_INVALIDATING, bitlock);
1345	smp_wmb();
1346	nfsi->cache_validity &=
1347		~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER);
1348	spin_unlock(&inode->i_lock);
1349	trace_nfs_invalidate_mapping_enter(inode);
1350	ret = nfs_invalidate_mapping(inode, mapping);
1351	trace_nfs_invalidate_mapping_exit(inode, ret);
1352
1353	clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1354	smp_mb__after_atomic();
1355	wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1356out:
1357	return ret;
1358}
1359
1360bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1361{
1362	return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1363		NFS_STALE(inode);
1364}
1365
1366int nfs_revalidate_mapping_rcu(struct inode *inode)
1367{
1368	struct nfs_inode *nfsi = NFS_I(inode);
1369	unsigned long *bitlock = &nfsi->flags;
1370	int ret = 0;
1371
1372	if (IS_SWAPFILE(inode))
1373		goto out;
1374	if (nfs_mapping_need_revalidate_inode(inode)) {
1375		ret = -ECHILD;
1376		goto out;
1377	}
1378	spin_lock(&inode->i_lock);
1379	if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1380	    (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1381		ret = -ECHILD;
1382	spin_unlock(&inode->i_lock);
1383out:
1384	return ret;
1385}
1386
1387/**
1388 * nfs_revalidate_mapping - Revalidate the pagecache
1389 * @inode: pointer to host inode
1390 * @mapping: pointer to mapping
1391 */
1392int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1393{
1394	/* swapfiles are not supposed to be shared. */
1395	if (IS_SWAPFILE(inode))
1396		return 0;
1397
1398	if (nfs_mapping_need_revalidate_inode(inode)) {
1399		int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1400		if (ret < 0)
1401			return ret;
1402	}
1403
1404	return nfs_clear_invalid_mapping(mapping);
1405}
1406
1407static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1408{
1409	struct inode *inode = &nfsi->vfs_inode;
1410
1411	if (!S_ISREG(inode->i_mode))
1412		return false;
1413	if (list_empty(&nfsi->open_files))
1414		return false;
1415	return inode_is_open_for_write(inode);
1416}
1417
1418static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1419{
1420	return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1421}
1422
1423static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1424{
1425	struct timespec64 ts;
1426
1427	if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1428			&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1429			&& inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1430		inode_set_iversion_raw(inode, fattr->change_attr);
1431		if (S_ISDIR(inode->i_mode))
1432			nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1433		else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1434			nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1435	}
1436	/* If we have atomic WCC data, we may update some attributes */
1437	ts = inode->i_ctime;
1438	if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1439			&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
1440			&& timespec64_equal(&ts, &fattr->pre_ctime)) {
1441		inode->i_ctime = fattr->ctime;
1442	}
1443
1444	ts = inode->i_mtime;
1445	if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1446			&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
1447			&& timespec64_equal(&ts, &fattr->pre_mtime)) {
1448		inode->i_mtime = fattr->mtime;
1449		if (S_ISDIR(inode->i_mode))
1450			nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1451	}
1452	if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1453			&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
1454			&& i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1455			&& !nfs_have_writebacks(inode)) {
 
1456		i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1457	}
1458}
1459
1460/**
1461 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1462 * @inode: pointer to inode
1463 * @fattr: updated attributes
1464 *
1465 * Verifies the attribute cache. If we have just changed the attributes,
1466 * so that fattr carries weak cache consistency data, then it may
1467 * also update the ctime/mtime/change_attribute.
1468 */
1469static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1470{
1471	struct nfs_inode *nfsi = NFS_I(inode);
1472	loff_t cur_size, new_isize;
1473	unsigned long invalid = 0;
1474	struct timespec64 ts;
1475
1476	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1477		return 0;
1478
1479	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1480		/* Only a mounted-on-fileid? Just exit */
1481		if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1482			return 0;
1483	/* Has the inode gone and changed behind our back? */
1484	} else if (nfsi->fileid != fattr->fileid) {
1485		/* Is this perhaps the mounted-on fileid? */
1486		if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1487		    nfsi->fileid == fattr->mounted_on_fileid)
1488			return 0;
1489		return -ESTALE;
1490	}
1491	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1492		return -ESTALE;
1493
1494
1495	if (!nfs_file_has_buffered_writers(nfsi)) {
1496		/* Verify a few of the more important attributes */
1497		if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1498			invalid |= NFS_INO_INVALID_CHANGE;
1499
1500		ts = inode->i_mtime;
1501		if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1502			invalid |= NFS_INO_INVALID_MTIME;
1503
1504		ts = inode->i_ctime;
1505		if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1506			invalid |= NFS_INO_INVALID_CTIME;
1507
1508		if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1509			cur_size = i_size_read(inode);
1510			new_isize = nfs_size_to_loff_t(fattr->size);
1511			if (cur_size != new_isize)
1512				invalid |= NFS_INO_INVALID_SIZE;
1513		}
1514	}
1515
1516	/* Have any file permissions changed? */
1517	if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1518		invalid |= NFS_INO_INVALID_MODE;
1519	if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1520		invalid |= NFS_INO_INVALID_OTHER;
1521	if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1522		invalid |= NFS_INO_INVALID_OTHER;
1523
1524	/* Has the link count changed? */
1525	if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1526		invalid |= NFS_INO_INVALID_NLINK;
1527
1528	ts = inode->i_atime;
1529	if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1530		invalid |= NFS_INO_INVALID_ATIME;
1531
1532	if (invalid != 0)
1533		nfs_set_cache_invalid(inode, invalid);
1534
1535	nfsi->read_cache_jiffies = fattr->time_start;
1536	return 0;
1537}
1538
1539static atomic_long_t nfs_attr_generation_counter;
1540
1541static unsigned long nfs_read_attr_generation_counter(void)
1542{
1543	return atomic_long_read(&nfs_attr_generation_counter);
1544}
1545
1546unsigned long nfs_inc_attr_generation_counter(void)
1547{
1548	return atomic_long_inc_return(&nfs_attr_generation_counter);
1549}
1550EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1551
1552void nfs_fattr_init(struct nfs_fattr *fattr)
1553{
1554	fattr->valid = 0;
1555	fattr->time_start = jiffies;
1556	fattr->gencount = nfs_inc_attr_generation_counter();
1557	fattr->owner_name = NULL;
1558	fattr->group_name = NULL;
1559}
1560EXPORT_SYMBOL_GPL(nfs_fattr_init);
1561
1562/**
1563 * nfs_fattr_set_barrier
1564 * @fattr: attributes
1565 *
1566 * Used to set a barrier after an attribute was updated. This
1567 * barrier ensures that older attributes from RPC calls that may
1568 * have raced with our update cannot clobber these new values.
1569 * Note that you are still responsible for ensuring that other
1570 * operations which change the attribute on the server do not
1571 * collide.
1572 */
1573void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1574{
1575	fattr->gencount = nfs_inc_attr_generation_counter();
1576}
1577
1578struct nfs_fattr *nfs_alloc_fattr(void)
1579{
1580	struct nfs_fattr *fattr;
1581
1582	fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1583	if (fattr != NULL)
1584		nfs_fattr_init(fattr);
 
 
1585	return fattr;
1586}
1587EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1588
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1589struct nfs_fh *nfs_alloc_fhandle(void)
1590{
1591	struct nfs_fh *fh;
1592
1593	fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1594	if (fh != NULL)
1595		fh->size = 0;
1596	return fh;
1597}
1598EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1599
1600#ifdef NFS_DEBUG
1601/*
1602 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1603 *                             in the same way that wireshark does
1604 *
1605 * @fh: file handle
1606 *
1607 * For debugging only.
1608 */
1609u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1610{
1611	/* wireshark uses 32-bit AUTODIN crc and does a bitwise
1612	 * not on the result */
1613	return nfs_fhandle_hash(fh);
1614}
1615EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1616
1617/*
1618 * _nfs_display_fhandle - display an NFS file handle on the console
1619 *
1620 * @fh: file handle to display
1621 * @caption: display caption
1622 *
1623 * For debugging only.
1624 */
1625void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1626{
1627	unsigned short i;
1628
1629	if (fh == NULL || fh->size == 0) {
1630		printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1631		return;
1632	}
1633
1634	printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1635	       caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1636	for (i = 0; i < fh->size; i += 16) {
1637		__be32 *pos = (__be32 *)&fh->data[i];
1638
1639		switch ((fh->size - i - 1) >> 2) {
1640		case 0:
1641			printk(KERN_DEFAULT " %08x\n",
1642				be32_to_cpup(pos));
1643			break;
1644		case 1:
1645			printk(KERN_DEFAULT " %08x %08x\n",
1646				be32_to_cpup(pos), be32_to_cpup(pos + 1));
1647			break;
1648		case 2:
1649			printk(KERN_DEFAULT " %08x %08x %08x\n",
1650				be32_to_cpup(pos), be32_to_cpup(pos + 1),
1651				be32_to_cpup(pos + 2));
1652			break;
1653		default:
1654			printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1655				be32_to_cpup(pos), be32_to_cpup(pos + 1),
1656				be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1657		}
1658	}
1659}
1660EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1661#endif
1662
1663/**
1664 * nfs_inode_attrs_cmp_generic - compare attributes
1665 * @fattr: attributes
1666 * @inode: pointer to inode
1667 *
1668 * Attempt to divine whether or not an RPC call reply carrying stale
1669 * attributes got scheduled after another call carrying updated ones.
1670 * Note also the check for wraparound of 'attr_gencount'
1671 *
1672 * The function returns '1' if it thinks the attributes in @fattr are
1673 * more recent than the ones cached in @inode. Otherwise it returns
1674 * the value '0'.
1675 */
1676static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1677				       const struct inode *inode)
1678{
1679	unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1680
1681	return (long)(fattr->gencount - attr_gencount) > 0 ||
1682	       (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1683}
1684
1685/**
1686 * nfs_inode_attrs_cmp_monotonic - compare attributes
1687 * @fattr: attributes
1688 * @inode: pointer to inode
1689 *
1690 * Attempt to divine whether or not an RPC call reply carrying stale
1691 * attributes got scheduled after another call carrying updated ones.
1692 *
1693 * We assume that the server observes monotonic semantics for
1694 * the change attribute, so a larger value means that the attributes in
1695 * @fattr are more recent, in which case the function returns the
1696 * value '1'.
1697 * A return value of '0' indicates no measurable change
1698 * A return value of '-1' means that the attributes in @inode are
1699 * more recent.
1700 */
1701static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1702					 const struct inode *inode)
1703{
1704	s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1705	if (diff > 0)
1706		return 1;
1707	return diff == 0 ? 0 : -1;
1708}
1709
1710/**
1711 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1712 * @fattr: attributes
1713 * @inode: pointer to inode
1714 *
1715 * Attempt to divine whether or not an RPC call reply carrying stale
1716 * attributes got scheduled after another call carrying updated ones.
1717 *
1718 * We assume that the server observes strictly monotonic semantics for
1719 * the change attribute, so a larger value means that the attributes in
1720 * @fattr are more recent, in which case the function returns the
1721 * value '1'.
1722 * A return value of '-1' means that the attributes in @inode are
1723 * more recent or unchanged.
1724 */
1725static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1726						const struct inode *inode)
1727{
1728	return  nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1729}
1730
1731/**
1732 * nfs_inode_attrs_cmp - compare attributes
1733 * @fattr: attributes
1734 * @inode: pointer to inode
1735 *
1736 * This function returns '1' if it thinks the attributes in @fattr are
1737 * more recent than the ones cached in @inode. It returns '-1' if
1738 * the attributes in @inode are more recent than the ones in @fattr,
1739 * and it returns 0 if not sure.
1740 */
1741static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1742			       const struct inode *inode)
1743{
1744	if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1745		return 1;
1746	switch (NFS_SERVER(inode)->change_attr_type) {
1747	case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1748		break;
1749	case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1750		if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1751			break;
1752		return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1753	default:
1754		if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1755			break;
1756		return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1757	}
1758	return 0;
1759}
1760
1761/**
1762 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1763 * @fattr: attributes
1764 * @inode: pointer to inode
1765 *
1766 * Returns '1' if the last attribute update left the inode cached
1767 * attributes in a partially unrevalidated state, and @fattr
1768 * matches the change attribute of that partial update.
1769 * Otherwise returns '0'.
1770 */
1771static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1772						const struct inode *inode)
1773{
1774	const unsigned long check_valid =
1775		NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1776		NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1777		NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1778		NFS_INO_INVALID_NLINK;
1779	unsigned long cache_validity = NFS_I(inode)->cache_validity;
 
1780
1781	if (!(cache_validity & NFS_INO_INVALID_CHANGE) &&
 
1782	    (cache_validity & check_valid) != 0 &&
1783	    (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1784	    nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1785		return 1;
1786	return 0;
1787}
1788
1789static int nfs_refresh_inode_locked(struct inode *inode,
1790				    struct nfs_fattr *fattr)
1791{
1792	int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1793	int ret = 0;
1794
1795	trace_nfs_refresh_inode_enter(inode);
1796
1797	if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1798		ret = nfs_update_inode(inode, fattr);
1799	else if (attr_cmp == 0)
1800		ret = nfs_check_inode_attributes(inode, fattr);
1801
1802	trace_nfs_refresh_inode_exit(inode, ret);
1803	return ret;
1804}
1805
1806/**
1807 * nfs_refresh_inode - try to update the inode attribute cache
1808 * @inode: pointer to inode
1809 * @fattr: updated attributes
1810 *
1811 * Check that an RPC call that returned attributes has not overlapped with
1812 * other recent updates of the inode metadata, then decide whether it is
1813 * safe to do a full update of the inode attributes, or whether just to
1814 * call nfs_check_inode_attributes.
1815 */
1816int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1817{
1818	int status;
1819
1820	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1821		return 0;
1822	spin_lock(&inode->i_lock);
1823	status = nfs_refresh_inode_locked(inode, fattr);
1824	spin_unlock(&inode->i_lock);
1825
1826	return status;
1827}
1828EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1829
1830static int nfs_post_op_update_inode_locked(struct inode *inode,
1831		struct nfs_fattr *fattr, unsigned int invalid)
1832{
1833	if (S_ISDIR(inode->i_mode))
1834		invalid |= NFS_INO_INVALID_DATA;
1835	nfs_set_cache_invalid(inode, invalid);
1836	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1837		return 0;
1838	return nfs_refresh_inode_locked(inode, fattr);
1839}
1840
1841/**
1842 * nfs_post_op_update_inode - try to update the inode attribute cache
1843 * @inode: pointer to inode
1844 * @fattr: updated attributes
1845 *
1846 * After an operation that has changed the inode metadata, mark the
1847 * attribute cache as being invalid, then try to update it.
1848 *
1849 * NB: if the server didn't return any post op attributes, this
1850 * function will force the retrieval of attributes before the next
1851 * NFS request.  Thus it should be used only for operations that
1852 * are expected to change one or more attributes, to avoid
1853 * unnecessary NFS requests and trips through nfs_update_inode().
1854 */
1855int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1856{
1857	int status;
1858
1859	spin_lock(&inode->i_lock);
1860	nfs_fattr_set_barrier(fattr);
1861	status = nfs_post_op_update_inode_locked(inode, fattr,
1862			NFS_INO_INVALID_CHANGE
1863			| NFS_INO_INVALID_CTIME
1864			| NFS_INO_REVAL_FORCED);
1865	spin_unlock(&inode->i_lock);
1866
1867	return status;
1868}
1869EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1870
1871/**
1872 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1873 * @inode: pointer to inode
1874 * @fattr: updated attributes
1875 *
1876 * After an operation that has changed the inode metadata, mark the
1877 * attribute cache as being invalid, then try to update it. Fake up
1878 * weak cache consistency data, if none exist.
1879 *
1880 * This function is mainly designed to be used by the ->write_done() functions.
1881 */
1882int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1883{
1884	int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1885	int status;
1886
1887	/* Don't do a WCC update if these attributes are already stale */
1888	if (attr_cmp < 0)
1889		return 0;
1890	if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
1891		fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1892				| NFS_ATTR_FATTR_PRESIZE
1893				| NFS_ATTR_FATTR_PREMTIME
1894				| NFS_ATTR_FATTR_PRECTIME);
1895		goto out_noforce;
1896	}
1897	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1898			(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1899		fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1900		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1901	}
1902	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1903			(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1904		fattr->pre_ctime = inode->i_ctime;
1905		fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1906	}
1907	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1908			(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1909		fattr->pre_mtime = inode->i_mtime;
1910		fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1911	}
1912	if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1913			(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1914		fattr->pre_size = i_size_read(inode);
1915		fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1916	}
1917out_noforce:
1918	status = nfs_post_op_update_inode_locked(inode, fattr,
1919			NFS_INO_INVALID_CHANGE
1920			| NFS_INO_INVALID_CTIME
1921			| NFS_INO_INVALID_MTIME
1922			| NFS_INO_INVALID_BLOCKS);
1923	return status;
1924}
1925
1926/**
1927 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1928 * @inode: pointer to inode
1929 * @fattr: updated attributes
1930 *
1931 * After an operation that has changed the inode metadata, mark the
1932 * attribute cache as being invalid, then try to update it. Fake up
1933 * weak cache consistency data, if none exist.
1934 *
1935 * This function is mainly designed to be used by the ->write_done() functions.
1936 */
1937int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1938{
1939	int status;
1940
1941	spin_lock(&inode->i_lock);
1942	nfs_fattr_set_barrier(fattr);
1943	status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1944	spin_unlock(&inode->i_lock);
1945	return status;
1946}
1947EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1948
1949
1950/*
1951 * Many nfs protocol calls return the new file attributes after
1952 * an operation.  Here we update the inode to reflect the state
1953 * of the server's inode.
1954 *
1955 * This is a bit tricky because we have to make sure all dirty pages
1956 * have been sent off to the server before calling invalidate_inode_pages.
1957 * To make sure no other process adds more write requests while we try
1958 * our best to flush them, we make them sleep during the attribute refresh.
1959 *
1960 * A very similar scenario holds for the dir cache.
1961 */
1962static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1963{
1964	struct nfs_server *server = NFS_SERVER(inode);
1965	struct nfs_inode *nfsi = NFS_I(inode);
1966	loff_t cur_isize, new_isize;
1967	u64 fattr_supported = server->fattr_valid;
1968	unsigned long invalid = 0;
1969	unsigned long now = jiffies;
1970	unsigned long save_cache_validity;
1971	bool have_writers = nfs_file_has_buffered_writers(nfsi);
1972	bool cache_revalidated = true;
1973	bool attr_changed = false;
1974	bool have_delegation;
1975
1976	dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1977			__func__, inode->i_sb->s_id, inode->i_ino,
1978			nfs_display_fhandle_hash(NFS_FH(inode)),
1979			atomic_read(&inode->i_count), fattr->valid);
1980
1981	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1982		/* Only a mounted-on-fileid? Just exit */
1983		if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1984			return 0;
1985	/* Has the inode gone and changed behind our back? */
1986	} else if (nfsi->fileid != fattr->fileid) {
1987		/* Is this perhaps the mounted-on fileid? */
1988		if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1989		    nfsi->fileid == fattr->mounted_on_fileid)
1990			return 0;
1991		printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1992			"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1993			NFS_SERVER(inode)->nfs_client->cl_hostname,
1994			inode->i_sb->s_id, (long long)nfsi->fileid,
1995			(long long)fattr->fileid);
1996		goto out_err;
1997	}
1998
1999	/*
2000	 * Make sure the inode's type hasn't changed.
2001	 */
2002	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2003		/*
2004		* Big trouble! The inode has become a different object.
2005		*/
2006		printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2007				__func__, inode->i_ino, inode->i_mode, fattr->mode);
2008		goto out_err;
2009	}
2010
2011	/* Update the fsid? */
2012	if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2013			!nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2014			!IS_AUTOMOUNT(inode))
2015		server->fsid = fattr->fsid;
2016
2017	/* Save the delegation state before clearing cache_validity */
2018	have_delegation = nfs_have_delegated_attributes(inode);
2019
2020	/*
2021	 * Update the read time so we don't revalidate too often.
2022	 */
2023	nfsi->read_cache_jiffies = fattr->time_start;
2024
2025	save_cache_validity = nfsi->cache_validity;
2026	nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2027			| NFS_INO_INVALID_ATIME
2028			| NFS_INO_REVAL_FORCED
2029			| NFS_INO_INVALID_BLOCKS);
2030
2031	/* Do atomic weak cache consistency updates */
2032	nfs_wcc_update_inode(inode, fattr);
2033
2034	if (pnfs_layoutcommit_outstanding(inode)) {
2035		nfsi->cache_validity |=
2036			save_cache_validity &
2037			(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2038			 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2039			 NFS_INO_INVALID_BLOCKS);
2040		cache_revalidated = false;
2041	}
2042
2043	/* More cache consistency checks */
2044	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2045		if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2046			/* Could it be a race with writeback? */
2047			if (!(have_writers || have_delegation)) {
2048				invalid |= NFS_INO_INVALID_DATA
2049					| NFS_INO_INVALID_ACCESS
2050					| NFS_INO_INVALID_ACL
2051					| NFS_INO_INVALID_XATTR;
2052				/* Force revalidate of all attributes */
2053				save_cache_validity |= NFS_INO_INVALID_CTIME
2054					| NFS_INO_INVALID_MTIME
2055					| NFS_INO_INVALID_SIZE
2056					| NFS_INO_INVALID_BLOCKS
2057					| NFS_INO_INVALID_NLINK
2058					| NFS_INO_INVALID_MODE
2059					| NFS_INO_INVALID_OTHER;
2060				if (S_ISDIR(inode->i_mode))
2061					nfs_force_lookup_revalidate(inode);
2062				attr_changed = true;
2063				dprintk("NFS: change_attr change on server for file %s/%ld\n",
2064						inode->i_sb->s_id,
2065						inode->i_ino);
2066			} else if (!have_delegation)
2067				nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2068			inode_set_iversion_raw(inode, fattr->change_attr);
2069		}
2070	} else {
2071		nfsi->cache_validity |=
2072			save_cache_validity & NFS_INO_INVALID_CHANGE;
2073		if (!have_delegation ||
2074		    (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2075			cache_revalidated = false;
2076	}
2077
2078	if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2079		inode->i_mtime = fattr->mtime;
2080	else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2081		nfsi->cache_validity |=
2082			save_cache_validity & NFS_INO_INVALID_MTIME;
2083
2084	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2085		inode->i_ctime = fattr->ctime;
2086	else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2087		nfsi->cache_validity |=
2088			save_cache_validity & NFS_INO_INVALID_CTIME;
2089
2090	/* Check if our cached file size is stale */
2091	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2092		new_isize = nfs_size_to_loff_t(fattr->size);
2093		cur_isize = i_size_read(inode);
2094		if (new_isize != cur_isize && !have_delegation) {
2095			/* Do we perhaps have any outstanding writes, or has
2096			 * the file grown beyond our last write? */
2097			if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
 
2098				i_size_write(inode, new_isize);
2099				if (!have_writers)
2100					invalid |= NFS_INO_INVALID_DATA;
2101			}
2102			dprintk("NFS: isize change on server for file %s/%ld "
2103					"(%Ld to %Ld)\n",
2104					inode->i_sb->s_id,
2105					inode->i_ino,
2106					(long long)cur_isize,
2107					(long long)new_isize);
2108		}
2109		if (new_isize == 0 &&
2110		    !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2111				      NFS_ATTR_FATTR_BLOCKS_USED))) {
2112			fattr->du.nfs3.used = 0;
2113			fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2114		}
2115	} else
2116		nfsi->cache_validity |=
2117			save_cache_validity & NFS_INO_INVALID_SIZE;
2118
2119	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2120		inode->i_atime = fattr->atime;
2121	else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2122		nfsi->cache_validity |=
2123			save_cache_validity & NFS_INO_INVALID_ATIME;
2124
2125	if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2126		if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2127			umode_t newmode = inode->i_mode & S_IFMT;
2128			newmode |= fattr->mode & S_IALLUGO;
2129			inode->i_mode = newmode;
2130			invalid |= NFS_INO_INVALID_ACCESS
2131				| NFS_INO_INVALID_ACL;
2132		}
2133	} else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2134		nfsi->cache_validity |=
2135			save_cache_validity & NFS_INO_INVALID_MODE;
2136
2137	if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2138		if (!uid_eq(inode->i_uid, fattr->uid)) {
2139			invalid |= NFS_INO_INVALID_ACCESS
2140				| NFS_INO_INVALID_ACL;
2141			inode->i_uid = fattr->uid;
2142		}
2143	} else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2144		nfsi->cache_validity |=
2145			save_cache_validity & NFS_INO_INVALID_OTHER;
2146
2147	if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2148		if (!gid_eq(inode->i_gid, fattr->gid)) {
2149			invalid |= NFS_INO_INVALID_ACCESS
2150				| NFS_INO_INVALID_ACL;
2151			inode->i_gid = fattr->gid;
2152		}
2153	} else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2154		nfsi->cache_validity |=
2155			save_cache_validity & NFS_INO_INVALID_OTHER;
2156
2157	if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2158		if (inode->i_nlink != fattr->nlink) {
2159			if (S_ISDIR(inode->i_mode))
2160				invalid |= NFS_INO_INVALID_DATA;
2161			set_nlink(inode, fattr->nlink);
2162		}
2163	} else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2164		nfsi->cache_validity |=
2165			save_cache_validity & NFS_INO_INVALID_NLINK;
2166
2167	if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2168		/*
2169		 * report the blocks in 512byte units
2170		 */
2171		inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2172	} else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2173		nfsi->cache_validity |=
2174			save_cache_validity & NFS_INO_INVALID_BLOCKS;
2175
2176	if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2177		inode->i_blocks = fattr->du.nfs2.blocks;
2178	else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2179		nfsi->cache_validity |=
2180			save_cache_validity & NFS_INO_INVALID_BLOCKS;
2181
2182	/* Update attrtimeo value if we're out of the unstable period */
2183	if (attr_changed) {
2184		nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2185		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2186		nfsi->attrtimeo_timestamp = now;
2187		/* Set barrier to be more recent than all outstanding updates */
2188		nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2189	} else {
2190		if (cache_revalidated) {
2191			if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2192				nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2193				nfsi->attrtimeo <<= 1;
2194				if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2195					nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2196			}
2197			nfsi->attrtimeo_timestamp = now;
2198		}
2199		/* Set the barrier to be more recent than this fattr */
2200		if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2201			nfsi->attr_gencount = fattr->gencount;
2202	}
2203
2204	/* Don't invalidate the data if we were to blame */
2205	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2206				|| S_ISLNK(inode->i_mode)))
2207		invalid &= ~NFS_INO_INVALID_DATA;
2208	nfs_set_cache_invalid(inode, invalid);
2209
2210	return 0;
2211 out_err:
2212	/*
2213	 * No need to worry about unhashing the dentry, as the
2214	 * lookup validation will know that the inode is bad.
2215	 * (But we fall through to invalidate the caches.)
2216	 */
2217	nfs_set_inode_stale_locked(inode);
2218	return -ESTALE;
2219}
2220
2221struct inode *nfs_alloc_inode(struct super_block *sb)
2222{
2223	struct nfs_inode *nfsi;
2224	nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2225	if (!nfsi)
2226		return NULL;
2227	nfsi->flags = 0UL;
2228	nfsi->cache_validity = 0UL;
2229#if IS_ENABLED(CONFIG_NFS_V4)
2230	nfsi->nfs4_acl = NULL;
2231#endif /* CONFIG_NFS_V4 */
2232#ifdef CONFIG_NFS_V4_2
2233	nfsi->xattr_cache = NULL;
2234#endif
2235	return &nfsi->vfs_inode;
2236}
2237EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2238
2239void nfs_free_inode(struct inode *inode)
2240{
2241	kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2242}
2243EXPORT_SYMBOL_GPL(nfs_free_inode);
2244
2245static inline void nfs4_init_once(struct nfs_inode *nfsi)
2246{
2247#if IS_ENABLED(CONFIG_NFS_V4)
2248	INIT_LIST_HEAD(&nfsi->open_states);
2249	nfsi->delegation = NULL;
2250	init_rwsem(&nfsi->rwsem);
2251	nfsi->layout = NULL;
2252#endif
2253}
2254
2255static void init_once(void *foo)
2256{
2257	struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2258
2259	inode_init_once(&nfsi->vfs_inode);
2260	INIT_LIST_HEAD(&nfsi->open_files);
2261	INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2262	INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2263	INIT_LIST_HEAD(&nfsi->commit_info.list);
2264	atomic_long_set(&nfsi->nrequests, 0);
2265	atomic_long_set(&nfsi->commit_info.ncommit, 0);
2266	atomic_set(&nfsi->commit_info.rpcs_out, 0);
2267	init_rwsem(&nfsi->rmdir_sem);
2268	mutex_init(&nfsi->commit_mutex);
2269	nfs4_init_once(nfsi);
2270	nfsi->cache_change_attribute = 0;
2271}
2272
2273static int __init nfs_init_inodecache(void)
2274{
2275	nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2276					     sizeof(struct nfs_inode),
2277					     0, (SLAB_RECLAIM_ACCOUNT|
2278						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2279					     init_once);
2280	if (nfs_inode_cachep == NULL)
2281		return -ENOMEM;
2282
2283	return 0;
2284}
2285
2286static void nfs_destroy_inodecache(void)
2287{
2288	/*
2289	 * Make sure all delayed rcu free inodes are flushed before we
2290	 * destroy cache.
2291	 */
2292	rcu_barrier();
2293	kmem_cache_destroy(nfs_inode_cachep);
2294}
2295
2296struct workqueue_struct *nfsiod_workqueue;
2297EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2298
2299/*
2300 * start up the nfsiod workqueue
2301 */
2302static int nfsiod_start(void)
2303{
2304	struct workqueue_struct *wq;
2305	dprintk("RPC:       creating workqueue nfsiod\n");
2306	wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2307	if (wq == NULL)
2308		return -ENOMEM;
2309	nfsiod_workqueue = wq;
2310	return 0;
2311}
2312
2313/*
2314 * Destroy the nfsiod workqueue
2315 */
2316static void nfsiod_stop(void)
2317{
2318	struct workqueue_struct *wq;
2319
2320	wq = nfsiod_workqueue;
2321	if (wq == NULL)
2322		return;
2323	nfsiod_workqueue = NULL;
2324	destroy_workqueue(wq);
2325}
2326
2327unsigned int nfs_net_id;
2328EXPORT_SYMBOL_GPL(nfs_net_id);
2329
2330static int nfs_net_init(struct net *net)
2331{
2332	nfs_clients_init(net);
2333	return nfs_fs_proc_net_init(net);
2334}
2335
2336static void nfs_net_exit(struct net *net)
2337{
2338	nfs_fs_proc_net_exit(net);
2339	nfs_clients_exit(net);
2340}
2341
2342static struct pernet_operations nfs_net_ops = {
2343	.init = nfs_net_init,
2344	.exit = nfs_net_exit,
2345	.id   = &nfs_net_id,
2346	.size = sizeof(struct nfs_net),
2347};
2348
2349/*
2350 * Initialize NFS
2351 */
2352static int __init init_nfs_fs(void)
2353{
2354	int err;
2355
2356	err = nfs_sysfs_init();
2357	if (err < 0)
2358		goto out10;
2359
2360	err = register_pernet_subsys(&nfs_net_ops);
2361	if (err < 0)
2362		goto out9;
2363
2364	err = nfs_fscache_register();
2365	if (err < 0)
2366		goto out8;
2367
2368	err = nfsiod_start();
2369	if (err)
2370		goto out7;
2371
2372	err = nfs_fs_proc_init();
2373	if (err)
2374		goto out6;
2375
2376	err = nfs_init_nfspagecache();
2377	if (err)
2378		goto out5;
2379
2380	err = nfs_init_inodecache();
2381	if (err)
2382		goto out4;
2383
2384	err = nfs_init_readpagecache();
2385	if (err)
2386		goto out3;
2387
2388	err = nfs_init_writepagecache();
2389	if (err)
2390		goto out2;
2391
2392	err = nfs_init_directcache();
2393	if (err)
2394		goto out1;
2395
2396	rpc_proc_register(&init_net, &nfs_rpcstat);
2397
2398	err = register_nfs_fs();
2399	if (err)
2400		goto out0;
2401
2402	return 0;
2403out0:
2404	rpc_proc_unregister(&init_net, "nfs");
2405	nfs_destroy_directcache();
2406out1:
2407	nfs_destroy_writepagecache();
2408out2:
2409	nfs_destroy_readpagecache();
2410out3:
2411	nfs_destroy_inodecache();
2412out4:
2413	nfs_destroy_nfspagecache();
2414out5:
2415	nfs_fs_proc_exit();
2416out6:
2417	nfsiod_stop();
2418out7:
2419	nfs_fscache_unregister();
2420out8:
2421	unregister_pernet_subsys(&nfs_net_ops);
2422out9:
2423	nfs_sysfs_exit();
2424out10:
2425	return err;
2426}
2427
2428static void __exit exit_nfs_fs(void)
2429{
2430	nfs_destroy_directcache();
2431	nfs_destroy_writepagecache();
2432	nfs_destroy_readpagecache();
2433	nfs_destroy_inodecache();
2434	nfs_destroy_nfspagecache();
2435	nfs_fscache_unregister();
2436	unregister_pernet_subsys(&nfs_net_ops);
2437	rpc_proc_unregister(&init_net, "nfs");
2438	unregister_nfs_fs();
2439	nfs_fs_proc_exit();
2440	nfsiod_stop();
2441	nfs_sysfs_exit();
2442}
2443
2444/* Not quite true; I just maintain it */
2445MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2446MODULE_LICENSE("GPL");
2447module_param(enable_ino64, bool, 0644);
2448
2449module_init(init_nfs_fs)
2450module_exit(exit_nfs_fs)