1/*
   2 *  linux/fs/nfs/inode.c
   3 *
   4 *  Copyright (C) 1992  Rick Sladkey
   5 *
   6 *  nfs inode and superblock handling functions
   7 *
   8 *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
   9 *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
  10 *
  11 *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
  12 *  J.S.Peatfield@damtp.cam.ac.uk
  13 *
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/sched/signal.h>
  19#include <linux/time.h>
  20#include <linux/kernel.h>
  21#include <linux/mm.h>
  22#include <linux/string.h>
  23#include <linux/stat.h>
  24#include <linux/errno.h>
  25#include <linux/unistd.h>
  26#include <linux/sunrpc/clnt.h>
  27#include <linux/sunrpc/stats.h>
  28#include <linux/sunrpc/metrics.h>
  29#include <linux/nfs_fs.h>
  30#include <linux/nfs_mount.h>
  31#include <linux/nfs4_mount.h>
  32#include <linux/lockd/bind.h>
  33#include <linux/seq_file.h>
  34#include <linux/mount.h>
  35#include <linux/vfs.h>
  36#include <linux/inet.h>
  37#include <linux/nfs_xdr.h>
  38#include <linux/slab.h>
  39#include <linux/compat.h>
  40#include <linux/freezer.h>
  41#include <linux/uaccess.h>
  42#include <linux/iversion.h>
  43
  44#include "nfs4_fs.h"
  45#include "callback.h"
  46#include "delegation.h"
  47#include "iostat.h"
  48#include "internal.h"
  49#include "fscache.h"
  50#include "pnfs.h"
  51#include "nfs.h"
  52#include "netns.h"
 
  53
  54#include "nfstrace.h"
  55
  56#define NFSDBG_FACILITY		NFSDBG_VFS
  57
  58#define NFS_64_BIT_INODE_NUMBERS_ENABLED	1
  59
  60/* Default is to see 64-bit inode numbers */
  61static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
  62
  63static void nfs_invalidate_inode(struct inode *);
  64static int nfs_update_inode(struct inode *, struct nfs_fattr *);
  65
  66static struct kmem_cache * nfs_inode_cachep;
  67
  68static inline unsigned long
  69nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
  70{
  71	return nfs_fileid_to_ino_t(fattr->fileid);
  72}
  73
  74static int nfs_wait_killable(int mode)
  75{
  76	freezable_schedule_unsafe();
  77	if (signal_pending_state(mode, current))
  78		return -ERESTARTSYS;
  79	return 0;
  80}
  81
  82int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
  83{
  84	return nfs_wait_killable(mode);
  85}
  86EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
  87
  88/**
  89 * nfs_compat_user_ino64 - returns the user-visible inode number
  90 * @fileid: 64-bit fileid
  91 *
  92 * This function returns a 32-bit inode number if the boot parameter
  93 * nfs.enable_ino64 is zero.
  94 */
  95u64 nfs_compat_user_ino64(u64 fileid)
  96{
  97#ifdef CONFIG_COMPAT
  98	compat_ulong_t ino;
  99#else	
 100	unsigned long ino;
 101#endif
 102
 103	if (enable_ino64)
 104		return fileid;
 105	ino = fileid;
 106	if (sizeof(ino) < sizeof(fileid))
 107		ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
 108	return ino;
 109}
 110
 111int nfs_drop_inode(struct inode *inode)
 112{
 113	return NFS_STALE(inode) || generic_drop_inode(inode);
 114}
 115EXPORT_SYMBOL_GPL(nfs_drop_inode);
 116
 117void nfs_clear_inode(struct inode *inode)
 118{
 119	/*
 120	 * The following should never happen...
 121	 */
 122	WARN_ON_ONCE(nfs_have_writebacks(inode));
 123	WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
 124	nfs_zap_acl_cache(inode);
 125	nfs_access_zap_cache(inode);
 126	nfs_fscache_clear_inode(inode);
 127}
 128EXPORT_SYMBOL_GPL(nfs_clear_inode);
 129
 130void nfs_evict_inode(struct inode *inode)
 131{
 132	truncate_inode_pages_final(&inode->i_data);
 133	clear_inode(inode);
 134	nfs_clear_inode(inode);
 135}
 136
 137int nfs_sync_inode(struct inode *inode)
 138{
 139	inode_dio_wait(inode);
 140	return nfs_wb_all(inode);
 141}
 142EXPORT_SYMBOL_GPL(nfs_sync_inode);
 143
 144/**
 145 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
 
 146 */
 147int nfs_sync_mapping(struct address_space *mapping)
 148{
 149	int ret = 0;
 150
 151	if (mapping->nrpages != 0) {
 152		unmap_mapping_range(mapping, 0, 0, 0);
 153		ret = nfs_wb_all(mapping->host);
 154	}
 155	return ret;
 156}
 157
 158static int nfs_attribute_timeout(struct inode *inode)
 159{
 160	struct nfs_inode *nfsi = NFS_I(inode);
 161
 162	return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
 163}
 164
 165static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
 
 166{
 167	unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 168
 169	/* Special case for the pagecache or access cache */
 170	if (flags == NFS_INO_REVAL_PAGECACHE &&
 171	    !(cache_validity & NFS_INO_REVAL_FORCED))
 172		return false;
 173	return (cache_validity & flags) != 0;
 174}
 175
 176static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
 177{
 178	unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 179
 180	if ((cache_validity & flags) != 0)
 181		return true;
 182	if (nfs_attribute_timeout(inode))
 183		return true;
 184	return false;
 185}
 
 186
 187bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
 
 188{
 189	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
 190		return nfs_check_cache_invalid_delegated(inode, flags);
 191
 192	return nfs_check_cache_invalid_not_delegated(inode, flags);
 193}
 
 
 
 
 
 
 194
 195static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
 196{
 197	struct nfs_inode *nfsi = NFS_I(inode);
 198	bool have_delegation = nfs_have_delegated_attributes(inode);
 199
 200	if (have_delegation)
 201		flags &= ~(NFS_INO_INVALID_CHANGE|NFS_INO_REVAL_PAGECACHE);
 
 
 
 
 
 
 
 
 
 
 
 
 
 202	if (inode->i_mapping->nrpages == 0)
 203		flags &= ~NFS_INO_INVALID_DATA;
 204	nfsi->cache_validity |= flags;
 205	if (flags & NFS_INO_INVALID_DATA)
 206		nfs_fscache_invalidate(inode);
 
 
 
 
 
 
 207}
 
 208
 209/*
 210 * Invalidate the local caches
 211 */
 212static void nfs_zap_caches_locked(struct inode *inode)
 213{
 214	struct nfs_inode *nfsi = NFS_I(inode);
 215	int mode = inode->i_mode;
 216
 217	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
 218
 219	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 220	nfsi->attrtimeo_timestamp = jiffies;
 221
 222	memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
 223	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
 224		nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
 225					| NFS_INO_INVALID_DATA
 226					| NFS_INO_INVALID_ACCESS
 227					| NFS_INO_INVALID_ACL
 228					| NFS_INO_REVAL_PAGECACHE);
 229	} else
 230		nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
 231					| NFS_INO_INVALID_ACCESS
 232					| NFS_INO_INVALID_ACL
 233					| NFS_INO_REVAL_PAGECACHE);
 234	nfs_zap_label_cache_locked(nfsi);
 235}
 236
 237void nfs_zap_caches(struct inode *inode)
 238{
 239	spin_lock(&inode->i_lock);
 240	nfs_zap_caches_locked(inode);
 241	spin_unlock(&inode->i_lock);
 242}
 243
 244void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
 245{
 246	if (mapping->nrpages != 0) {
 247		spin_lock(&inode->i_lock);
 248		nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
 249		spin_unlock(&inode->i_lock);
 250	}
 251}
 252
 253void nfs_zap_acl_cache(struct inode *inode)
 254{
 255	void (*clear_acl_cache)(struct inode *);
 256
 257	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
 258	if (clear_acl_cache != NULL)
 259		clear_acl_cache(inode);
 260	spin_lock(&inode->i_lock);
 261	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
 262	spin_unlock(&inode->i_lock);
 263}
 264EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
 265
 266void nfs_invalidate_atime(struct inode *inode)
 267{
 
 
 268	spin_lock(&inode->i_lock);
 269	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 270	spin_unlock(&inode->i_lock);
 271}
 272EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
 273
 274/*
 275 * Invalidate, but do not unhash, the inode.
 276 * NB: must be called with inode->i_lock held!
 277 */
 278static void nfs_invalidate_inode(struct inode *inode)
 279{
 280	set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 281	nfs_zap_caches_locked(inode);
 
 
 
 
 
 
 
 
 282}
 283
 284struct nfs_find_desc {
 285	struct nfs_fh		*fh;
 286	struct nfs_fattr	*fattr;
 287};
 288
 289/*
 290 * In NFSv3 we can have 64bit inode numbers. In order to support
 291 * this, and re-exported directories (also seen in NFSv2)
 292 * we are forced to allow 2 different inodes to have the same
 293 * i_ino.
 294 */
 295static int
 296nfs_find_actor(struct inode *inode, void *opaque)
 297{
 298	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
 299	struct nfs_fh		*fh = desc->fh;
 300	struct nfs_fattr	*fattr = desc->fattr;
 301
 302	if (NFS_FILEID(inode) != fattr->fileid)
 303		return 0;
 304	if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
 305		return 0;
 306	if (nfs_compare_fh(NFS_FH(inode), fh))
 307		return 0;
 308	if (is_bad_inode(inode) || NFS_STALE(inode))
 309		return 0;
 310	return 1;
 311}
 312
 313static int
 314nfs_init_locked(struct inode *inode, void *opaque)
 315{
 316	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
 317	struct nfs_fattr	*fattr = desc->fattr;
 318
 319	set_nfs_fileid(inode, fattr->fileid);
 320	inode->i_mode = fattr->mode;
 321	nfs_copy_fh(NFS_FH(inode), desc->fh);
 322	return 0;
 323}
 324
 325#ifdef CONFIG_NFS_V4_SECURITY_LABEL
 326static void nfs_clear_label_invalid(struct inode *inode)
 327{
 328	spin_lock(&inode->i_lock);
 329	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
 330	spin_unlock(&inode->i_lock);
 331}
 332
 333void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 334					struct nfs4_label *label)
 335{
 336	int error;
 337
 338	if (label == NULL)
 339		return;
 340
 341	if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
 342		error = security_inode_notifysecctx(inode, label->label,
 343				label->len);
 344		if (error)
 345			printk(KERN_ERR "%s() %s %d "
 346					"security_inode_notifysecctx() %d\n",
 347					__func__,
 348					(char *)label->label,
 349					label->len, error);
 350		nfs_clear_label_invalid(inode);
 351	}
 352}
 353
 354struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
 355{
 356	struct nfs4_label *label = NULL;
 357	int minor_version = server->nfs_client->cl_minorversion;
 358
 359	if (minor_version < 2)
 360		return label;
 361
 362	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
 363		return label;
 364
 365	label = kzalloc(sizeof(struct nfs4_label), flags);
 366	if (label == NULL)
 367		return ERR_PTR(-ENOMEM);
 368
 369	label->label = kzalloc(NFS4_MAXLABELLEN, flags);
 370	if (label->label == NULL) {
 371		kfree(label);
 372		return ERR_PTR(-ENOMEM);
 373	}
 374	label->len = NFS4_MAXLABELLEN;
 375
 376	return label;
 377}
 378EXPORT_SYMBOL_GPL(nfs4_label_alloc);
 379#else
 380void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 381					struct nfs4_label *label)
 382{
 383}
 384#endif
 385EXPORT_SYMBOL_GPL(nfs_setsecurity);
 386
 387/* Search for inode identified by fh, fileid and i_mode in inode cache. */
 388struct inode *
 389nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
 390{
 391	struct nfs_find_desc desc = {
 392		.fh	= fh,
 393		.fattr	= fattr,
 394	};
 395	struct inode *inode;
 396	unsigned long hash;
 397
 398	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
 399	    !(fattr->valid & NFS_ATTR_FATTR_TYPE))
 400		return NULL;
 401
 402	hash = nfs_fattr_to_ino_t(fattr);
 403	inode = ilookup5(sb, hash, nfs_find_actor, &desc);
 404
 405	dprintk("%s: returning %p\n", __func__, inode);
 406	return inode;
 407}
 408
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 409/*
 410 * This is our front-end to iget that looks up inodes by file handle
 411 * instead of inode number.
 412 */
 413struct inode *
 414nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
 415{
 416	struct nfs_find_desc desc = {
 417		.fh	= fh,
 418		.fattr	= fattr
 419	};
 420	struct inode *inode = ERR_PTR(-ENOENT);
 
 421	unsigned long hash;
 422
 423	nfs_attr_check_mountpoint(sb, fattr);
 424
 425	if (nfs_attr_use_mounted_on_fileid(fattr))
 426		fattr->fileid = fattr->mounted_on_fileid;
 427	else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
 428		goto out_no_inode;
 429	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
 430		goto out_no_inode;
 431
 432	hash = nfs_fattr_to_ino_t(fattr);
 433
 434	inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
 435	if (inode == NULL) {
 436		inode = ERR_PTR(-ENOMEM);
 437		goto out_no_inode;
 438	}
 439
 440	if (inode->i_state & I_NEW) {
 441		struct nfs_inode *nfsi = NFS_I(inode);
 442		unsigned long now = jiffies;
 443
 444		/* We set i_ino for the few things that still rely on it,
 445		 * such as stat(2) */
 446		inode->i_ino = hash;
 447
 448		/* We can't support update_atime(), since the server will reset it */
 449		inode->i_flags |= S_NOATIME|S_NOCMTIME;
 450		inode->i_mode = fattr->mode;
 
 451		if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
 452				&& nfs_server_capable(inode, NFS_CAP_MODE))
 453			nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 454		/* Why so? Because we want revalidate for devices/FIFOs, and
 455		 * that's precisely what we have in nfs_file_inode_operations.
 456		 */
 457		inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
 458		if (S_ISREG(inode->i_mode)) {
 459			inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
 460			inode->i_data.a_ops = &nfs_file_aops;
 
 
 461		} else if (S_ISDIR(inode->i_mode)) {
 462			inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
 463			inode->i_fop = &nfs_dir_operations;
 464			inode->i_data.a_ops = &nfs_dir_aops;
 
 465			/* Deal with crossing mountpoints */
 466			if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
 467					fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
 468				if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
 469					inode->i_op = &nfs_referral_inode_operations;
 470				else
 471					inode->i_op = &nfs_mountpoint_inode_operations;
 472				inode->i_fop = NULL;
 473				inode->i_flags |= S_AUTOMOUNT;
 474			}
 475		} else if (S_ISLNK(inode->i_mode)) {
 476			inode->i_op = &nfs_symlink_inode_operations;
 477			inode_nohighmem(inode);
 478		} else
 479			init_special_inode(inode, inode->i_mode, fattr->rdev);
 480
 481		memset(&inode->i_atime, 0, sizeof(inode->i_atime));
 482		memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
 483		memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
 484		inode_set_iversion_raw(inode, 0);
 485		inode->i_size = 0;
 486		clear_nlink(inode);
 487		inode->i_uid = make_kuid(&init_user_ns, -2);
 488		inode->i_gid = make_kgid(&init_user_ns, -2);
 489		inode->i_blocks = 0;
 490		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
 491		nfsi->write_io = 0;
 492		nfsi->read_io = 0;
 493
 494		nfsi->read_cache_jiffies = fattr->time_start;
 495		nfsi->attr_gencount = fattr->gencount;
 496		if (fattr->valid & NFS_ATTR_FATTR_ATIME)
 497			inode->i_atime = fattr->atime;
 498		else if (nfs_server_capable(inode, NFS_CAP_ATIME))
 499			nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
 500		if (fattr->valid & NFS_ATTR_FATTR_MTIME)
 501			inode->i_mtime = fattr->mtime;
 502		else if (nfs_server_capable(inode, NFS_CAP_MTIME))
 503			nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 504		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
 505			inode->i_ctime = fattr->ctime;
 506		else if (nfs_server_capable(inode, NFS_CAP_CTIME))
 507			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
 508		if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
 509			inode_set_iversion_raw(inode, fattr->change_attr);
 510		else
 511			nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
 512		if (fattr->valid & NFS_ATTR_FATTR_SIZE)
 513			inode->i_size = nfs_size_to_loff_t(fattr->size);
 514		else
 515			nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
 516		if (fattr->valid & NFS_ATTR_FATTR_NLINK)
 517			set_nlink(inode, fattr->nlink);
 518		else if (nfs_server_capable(inode, NFS_CAP_NLINK))
 519			nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 520		if (fattr->valid & NFS_ATTR_FATTR_OWNER)
 521			inode->i_uid = fattr->uid;
 522		else if (nfs_server_capable(inode, NFS_CAP_OWNER))
 523			nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 524		if (fattr->valid & NFS_ATTR_FATTR_GROUP)
 525			inode->i_gid = fattr->gid;
 526		else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
 527			nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
 528		if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
 529			inode->i_blocks = fattr->du.nfs2.blocks;
 
 
 
 530		if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
 531			/*
 532			 * report the blocks in 512byte units
 533			 */
 534			inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
 535		}
 
 
 536
 537		nfs_setsecurity(inode, fattr, label);
 538
 539		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
 540		nfsi->attrtimeo_timestamp = now;
 541		nfsi->access_cache = RB_ROOT;
 542
 543		nfs_fscache_init_inode(inode);
 544
 545		unlock_new_inode(inode);
 546	} else {
 547		int err = nfs_refresh_inode(inode, fattr);
 548		if (err < 0) {
 549			iput(inode);
 550			inode = ERR_PTR(err);
 551			goto out_no_inode;
 552		}
 553	}
 554	dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
 555		inode->i_sb->s_id,
 556		(unsigned long long)NFS_FILEID(inode),
 557		nfs_display_fhandle_hash(fh),
 558		atomic_read(&inode->i_count));
 559
 560out:
 561	return inode;
 562
 563out_no_inode:
 564	dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
 565	goto out;
 566}
 567EXPORT_SYMBOL_GPL(nfs_fhget);
 568
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 569#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)
 570
 571int
 572nfs_setattr(struct dentry *dentry, struct iattr *attr)
 
 573{
 574	struct inode *inode = d_inode(dentry);
 575	struct nfs_fattr *fattr;
 576	int error = 0;
 577
 578	nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
 579
 580	/* skip mode change if it's just for clearing setuid/setgid */
 581	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
 582		attr->ia_valid &= ~ATTR_MODE;
 583
 584	if (attr->ia_valid & ATTR_SIZE) {
 585		BUG_ON(!S_ISREG(inode->i_mode));
 586
 587		error = inode_newsize_ok(inode, attr->ia_size);
 588		if (error)
 589			return error;
 590
 591		if (attr->ia_size == i_size_read(inode))
 592			attr->ia_valid &= ~ATTR_SIZE;
 593	}
 594
 
 
 
 
 
 
 
 
 
 
 
 
 595	/* Optimization: if the end result is no change, don't RPC */
 596	attr->ia_valid &= NFS_VALID_ATTRS;
 597	if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
 598		return 0;
 599
 600	trace_nfs_setattr_enter(inode);
 601
 602	/* Write all dirty data */
 603	if (S_ISREG(inode->i_mode))
 604		nfs_sync_inode(inode);
 605
 606	fattr = nfs_alloc_fattr();
 607	if (fattr == NULL) {
 608		error = -ENOMEM;
 609		goto out;
 610	}
 611
 612	error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
 613	if (error == 0)
 614		error = nfs_refresh_inode(inode, fattr);
 615	nfs_free_fattr(fattr);
 616out:
 617	trace_nfs_setattr_exit(inode, error);
 618	return error;
 619}
 620EXPORT_SYMBOL_GPL(nfs_setattr);
 621
 622/**
 623 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
 624 * @inode: inode of the file used
 625 * @offset: file offset to start truncating
 626 *
 627 * This is a copy of the common vmtruncate, but with the locking
 628 * corrected to take into account the fact that NFS requires
 629 * inode->i_size to be updated under the inode->i_lock.
 630 * Note: must be called with inode->i_lock held!
 631 */
 632static int nfs_vmtruncate(struct inode * inode, loff_t offset)
 633{
 634	int err;
 635
 636	err = inode_newsize_ok(inode, offset);
 637	if (err)
 638		goto out;
 639
 
 640	i_size_write(inode, offset);
 641	/* Optimisation */
 642	if (offset == 0)
 643		NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
 
 
 644	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
 645
 646	spin_unlock(&inode->i_lock);
 647	truncate_pagecache(inode, offset);
 
 648	spin_lock(&inode->i_lock);
 649out:
 650	return err;
 651}
 652
 653/**
 654 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 655 * @inode: pointer to struct inode
 656 * @attr: pointer to struct iattr
 657 * @fattr: pointer to struct nfs_fattr
 658 *
 659 * Note: we do this in the *proc.c in order to ensure that
 660 *       it works for things like exclusive creates too.
 661 */
 662void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
 663		struct nfs_fattr *fattr)
 664{
 665	/* Barrier: bump the attribute generation count. */
 666	nfs_fattr_set_barrier(fattr);
 667
 668	spin_lock(&inode->i_lock);
 669	NFS_I(inode)->attr_gencount = fattr->gencount;
 670	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
 671			| NFS_INO_INVALID_CTIME);
 
 
 
 
 
 672	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
 
 
 
 
 
 
 673		if ((attr->ia_valid & ATTR_MODE) != 0) {
 674			int mode = attr->ia_mode & S_IALLUGO;
 675			mode |= inode->i_mode & ~S_IALLUGO;
 676			inode->i_mode = mode;
 677		}
 678		if ((attr->ia_valid & ATTR_UID) != 0)
 679			inode->i_uid = attr->ia_uid;
 680		if ((attr->ia_valid & ATTR_GID) != 0)
 681			inode->i_gid = attr->ia_gid;
 
 
 
 
 
 682		nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
 683				| NFS_INO_INVALID_ACL);
 684	}
 685	if ((attr->ia_valid & ATTR_SIZE) != 0) {
 686		nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
 687		nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
 688		nfs_vmtruncate(inode, attr->ia_size);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 689	}
 690	if (fattr->valid)
 691		nfs_update_inode(inode, fattr);
 692	spin_unlock(&inode->i_lock);
 693}
 694EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
 695
 696static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
 
 
 
 
 697{
 698	struct dentry *parent;
 
 
 699
 700	if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
 701		return;
 702	parent = dget_parent(dentry);
 703	nfs_force_use_readdirplus(d_inode(parent));
 704	dput(parent);
 
 
 705}
 706
 707static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
 708{
 709	struct dentry *parent;
 710
 711	if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
 712		return;
 713	parent = dget_parent(dentry);
 714	nfs_advise_use_readdirplus(d_inode(parent));
 715	dput(parent);
 716}
 717
 718static bool nfs_need_revalidate_inode(struct inode *inode)
 719{
 720	if (NFS_I(inode)->cache_validity &
 721			(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
 722		return true;
 723	if (nfs_attribute_cache_expired(inode))
 724		return true;
 725	return false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 726}
 727
 728int nfs_getattr(const struct path *path, struct kstat *stat,
 729		u32 request_mask, unsigned int query_flags)
 730{
 731	struct inode *inode = d_inode(path->dentry);
 732	struct nfs_server *server = NFS_SERVER(inode);
 733	unsigned long cache_validity;
 734	int err = 0;
 735	bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
 736	bool do_update = false;
 
 737
 738	trace_nfs_getattr_enter(inode);
 739
 740	if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
 741		goto out_no_update;
 
 
 742
 743	/* Flush out writes to the server in order to update c/mtime.  */
 744	if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
 745			S_ISREG(inode->i_mode)) {
 746		err = filemap_write_and_wait(inode->i_mapping);
 747		if (err)
 748			goto out;
 
 
 
 
 
 
 
 749	}
 750
 751	/*
 752	 * We may force a getattr if the user cares about atime.
 753	 *
 754	 * Note that we only have to check the vfsmount flags here:
 755	 *  - NFS always sets S_NOATIME by so checking it would give a
 756	 *    bogus result
 757	 *  - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
 758	 *    no point in checking those.
 759	 */
 760	if ((path->mnt->mnt_flags & MNT_NOATIME) ||
 761	    ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
 762		request_mask &= ~STATX_ATIME;
 763
 764	/* Is the user requesting attributes that might need revalidation? */
 765	if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
 766					STATX_MTIME|STATX_UID|STATX_GID|
 767					STATX_SIZE|STATX_BLOCKS)))
 
 768		goto out_no_revalidate;
 769
 770	/* Check whether the cached attributes are stale */
 771	do_update |= force_sync || nfs_attribute_cache_expired(inode);
 772	cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 773	do_update |= cache_validity &
 774		(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
 775	if (request_mask & STATX_ATIME)
 776		do_update |= cache_validity & NFS_INO_INVALID_ATIME;
 777	if (request_mask & (STATX_CTIME|STATX_MTIME))
 778		do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
 
 
 
 
 
 
 
 
 
 
 
 
 
 779	if (do_update) {
 780		/* Update the attribute cache */
 781		if (!(server->flags & NFS_MOUNT_NOAC))
 782			nfs_readdirplus_parent_cache_miss(path->dentry);
 783		else
 784			nfs_readdirplus_parent_cache_hit(path->dentry);
 785		err = __nfs_revalidate_inode(server, inode);
 786		if (err)
 787			goto out;
 788	} else
 789		nfs_readdirplus_parent_cache_hit(path->dentry);
 790out_no_revalidate:
 791	/* Only return attributes that were revalidated. */
 792	stat->result_mask &= request_mask;
 793out_no_update:
 794	generic_fillattr(inode, stat);
 795	stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
 
 
 
 
 796	if (S_ISDIR(inode->i_mode))
 797		stat->blksize = NFS_SERVER(inode)->dtsize;
 798out:
 799	trace_nfs_getattr_exit(inode, err);
 800	return err;
 801}
 802EXPORT_SYMBOL_GPL(nfs_getattr);
 803
 804static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
 805{
 806	refcount_set(&l_ctx->count, 1);
 807	l_ctx->lockowner = current->files;
 808	INIT_LIST_HEAD(&l_ctx->list);
 809	atomic_set(&l_ctx->io_count, 0);
 810}
 811
 812static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
 813{
 814	struct nfs_lock_context *head = &ctx->lock_context;
 815	struct nfs_lock_context *pos = head;
 816
 817	do {
 818		if (pos->lockowner != current->files)
 819			continue;
 820		refcount_inc(&pos->count);
 821		return pos;
 822	} while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
 823	return NULL;
 824}
 825
 826struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
 827{
 828	struct nfs_lock_context *res, *new = NULL;
 829	struct inode *inode = d_inode(ctx->dentry);
 830
 831	spin_lock(&inode->i_lock);
 832	res = __nfs_find_lock_context(ctx);
 
 833	if (res == NULL) {
 834		spin_unlock(&inode->i_lock);
 835		new = kmalloc(sizeof(*new), GFP_KERNEL);
 836		if (new == NULL)
 837			return ERR_PTR(-ENOMEM);
 838		nfs_init_lock_context(new);
 839		spin_lock(&inode->i_lock);
 840		res = __nfs_find_lock_context(ctx);
 841		if (res == NULL) {
 842			list_add_tail(&new->list, &ctx->lock_context.list);
 843			new->open_context = ctx;
 844			res = new;
 845			new = NULL;
 
 
 
 
 846		}
 
 
 847	}
 848	spin_unlock(&inode->i_lock);
 849	kfree(new);
 850	return res;
 851}
 852EXPORT_SYMBOL_GPL(nfs_get_lock_context);
 853
 854void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
 855{
 856	struct nfs_open_context *ctx = l_ctx->open_context;
 857	struct inode *inode = d_inode(ctx->dentry);
 858
 859	if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
 860		return;
 861	list_del(&l_ctx->list);
 862	spin_unlock(&inode->i_lock);
 863	kfree(l_ctx);
 
 864}
 865EXPORT_SYMBOL_GPL(nfs_put_lock_context);
 866
 867/**
 868 * nfs_close_context - Common close_context() routine NFSv2/v3
 869 * @ctx: pointer to context
 870 * @is_sync: is this a synchronous close
 871 *
 872 * Ensure that the attributes are up to date if we're mounted
 873 * with close-to-open semantics and we have cached data that will
 874 * need to be revalidated on open.
 875 */
 876void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
 877{
 878	struct nfs_inode *nfsi;
 879	struct inode *inode;
 880	struct nfs_server *server;
 881
 882	if (!(ctx->mode & FMODE_WRITE))
 883		return;
 884	if (!is_sync)
 885		return;
 886	inode = d_inode(ctx->dentry);
 887	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
 888		return;
 889	nfsi = NFS_I(inode);
 890	if (inode->i_mapping->nrpages == 0)
 891		return;
 892	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
 893		return;
 894	if (!list_empty(&nfsi->open_files))
 895		return;
 896	server = NFS_SERVER(inode);
 897	if (server->flags & NFS_MOUNT_NOCTO)
 898		return;
 899	nfs_revalidate_inode(server, inode);
 
 900}
 901EXPORT_SYMBOL_GPL(nfs_close_context);
 902
 903struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
 904						fmode_t f_mode,
 905						struct file *filp)
 906{
 907	struct nfs_open_context *ctx;
 908	struct rpc_cred *cred = rpc_lookup_cred();
 909	if (IS_ERR(cred))
 910		return ERR_CAST(cred);
 911
 912	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 913	if (!ctx) {
 914		put_rpccred(cred);
 915		return ERR_PTR(-ENOMEM);
 916	}
 917	nfs_sb_active(dentry->d_sb);
 918	ctx->dentry = dget(dentry);
 919	ctx->cred = cred;
 
 
 
 
 920	ctx->state = NULL;
 921	ctx->mode = f_mode;
 922	ctx->flags = 0;
 923	ctx->error = 0;
 924	ctx->flock_owner = (fl_owner_t)filp;
 925	nfs_init_lock_context(&ctx->lock_context);
 926	ctx->lock_context.open_context = ctx;
 927	INIT_LIST_HEAD(&ctx->list);
 928	ctx->mdsthreshold = NULL;
 929	return ctx;
 930}
 931EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
 932
 933struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
 934{
 935	if (ctx != NULL)
 936		refcount_inc(&ctx->lock_context.count);
 937	return ctx;
 938}
 939EXPORT_SYMBOL_GPL(get_nfs_open_context);
 940
 941static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
 942{
 943	struct inode *inode = d_inode(ctx->dentry);
 944	struct super_block *sb = ctx->dentry->d_sb;
 945
 
 
 946	if (!list_empty(&ctx->list)) {
 947		if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
 948			return;
 949		list_del(&ctx->list);
 950		spin_unlock(&inode->i_lock);
 951	} else if (!refcount_dec_and_test(&ctx->lock_context.count))
 952		return;
 953	if (inode != NULL)
 954		NFS_PROTO(inode)->close_context(ctx, is_sync);
 955	if (ctx->cred != NULL)
 956		put_rpccred(ctx->cred);
 957	dput(ctx->dentry);
 958	nfs_sb_deactive(sb);
 
 959	kfree(ctx->mdsthreshold);
 960	kfree(ctx);
 961}
 962
 963void put_nfs_open_context(struct nfs_open_context *ctx)
 964{
 965	__put_nfs_open_context(ctx, 0);
 966}
 967EXPORT_SYMBOL_GPL(put_nfs_open_context);
 968
 969static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
 970{
 971	__put_nfs_open_context(ctx, 1);
 972}
 973
 974/*
 975 * Ensure that mmap has a recent RPC credential for use when writing out
 976 * shared pages
 977 */
 978void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
 979{
 980	struct inode *inode = d_inode(ctx->dentry);
 981	struct nfs_inode *nfsi = NFS_I(inode);
 982
 983	spin_lock(&inode->i_lock);
 984	if (ctx->mode & FMODE_WRITE)
 985		list_add(&ctx->list, &nfsi->open_files);
 986	else
 987		list_add_tail(&ctx->list, &nfsi->open_files);
 
 988	spin_unlock(&inode->i_lock);
 989}
 990EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
 991
 992void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
 993{
 994	filp->private_data = get_nfs_open_context(ctx);
 
 995	if (list_empty(&ctx->list))
 996		nfs_inode_attach_open_context(ctx);
 997}
 998EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
 999
1000/*
1001 * Given an inode, search for an open context with the desired characteristics
1002 */
1003struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1004{
1005	struct nfs_inode *nfsi = NFS_I(inode);
1006	struct nfs_open_context *pos, *ctx = NULL;
1007
1008	spin_lock(&inode->i_lock);
1009	list_for_each_entry(pos, &nfsi->open_files, list) {
1010		if (cred != NULL && pos->cred != cred)
1011			continue;
1012		if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1013			continue;
 
 
1014		ctx = get_nfs_open_context(pos);
1015		break;
 
1016	}
1017	spin_unlock(&inode->i_lock);
1018	return ctx;
1019}
1020
1021void nfs_file_clear_open_context(struct file *filp)
1022{
1023	struct nfs_open_context *ctx = nfs_file_open_context(filp);
1024
1025	if (ctx) {
1026		struct inode *inode = d_inode(ctx->dentry);
1027
 
1028		/*
1029		 * We fatal error on write before. Try to writeback
1030		 * every page again.
1031		 */
1032		if (ctx->error < 0)
1033			invalidate_inode_pages2(inode->i_mapping);
1034		filp->private_data = NULL;
1035		spin_lock(&inode->i_lock);
1036		list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1037		spin_unlock(&inode->i_lock);
1038		put_nfs_open_context_sync(ctx);
1039	}
1040}
1041
1042/*
1043 * These allocate and release file read/write context information.
1044 */
1045int nfs_open(struct inode *inode, struct file *filp)
1046{
1047	struct nfs_open_context *ctx;
1048
1049	ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
 
1050	if (IS_ERR(ctx))
1051		return PTR_ERR(ctx);
1052	nfs_file_set_open_context(filp, ctx);
1053	put_nfs_open_context(ctx);
1054	nfs_fscache_open_file(inode, filp);
1055	return 0;
1056}
1057
1058/*
1059 * This function is called whenever some part of NFS notices that
1060 * the cached attributes have to be refreshed.
1061 */
1062int
1063__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1064{
1065	int		 status = -ESTALE;
1066	struct nfs4_label *label = NULL;
1067	struct nfs_fattr *fattr = NULL;
1068	struct nfs_inode *nfsi = NFS_I(inode);
1069
1070	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1071		inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1072
1073	trace_nfs_revalidate_inode_enter(inode);
1074
1075	if (is_bad_inode(inode))
1076		goto out;
1077	if (NFS_STALE(inode))
1078		goto out;
1079
1080	/* pNFS: Attributes aren't updated until we layoutcommit */
1081	if (S_ISREG(inode->i_mode)) {
1082		status = pnfs_sync_inode(inode, false);
1083		if (status)
1084			goto out;
1085	}
1086
1087	status = -ENOMEM;
1088	fattr = nfs_alloc_fattr();
1089	if (fattr == NULL)
1090		goto out;
1091
1092	nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1093
1094	label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1095	if (IS_ERR(label)) {
1096		status = PTR_ERR(label);
1097		goto out;
1098	}
1099
1100	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1101	if (status != 0) {
1102		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1103			 inode->i_sb->s_id,
1104			 (unsigned long long)NFS_FILEID(inode), status);
1105		if (status == -ESTALE) {
1106			nfs_zap_caches(inode);
 
 
 
 
 
1107			if (!S_ISDIR(inode->i_mode))
1108				set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 
 
1109		}
1110		goto err_out;
1111	}
1112
1113	status = nfs_refresh_inode(inode, fattr);
1114	if (status) {
1115		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1116			 inode->i_sb->s_id,
1117			 (unsigned long long)NFS_FILEID(inode), status);
1118		goto err_out;
1119	}
1120
1121	if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1122		nfs_zap_acl_cache(inode);
1123
1124	nfs_setsecurity(inode, fattr, label);
1125
1126	dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1127		inode->i_sb->s_id,
1128		(unsigned long long)NFS_FILEID(inode));
1129
1130err_out:
1131	nfs4_label_free(label);
1132out:
1133	nfs_free_fattr(fattr);
1134	trace_nfs_revalidate_inode_exit(inode, status);
1135	return status;
1136}
1137
1138int nfs_attribute_cache_expired(struct inode *inode)
1139{
1140	if (nfs_have_delegated_attributes(inode))
1141		return 0;
1142	return nfs_attribute_timeout(inode);
1143}
1144
1145/**
1146 * nfs_revalidate_inode - Revalidate the inode attributes
1147 * @server - pointer to nfs_server struct
1148 * @inode - pointer to inode struct
1149 *
1150 * Updates inode attribute information by retrieving the data from the server.
1151 */
1152int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1153{
1154	if (!nfs_need_revalidate_inode(inode))
1155		return NFS_STALE(inode) ? -ESTALE : 0;
1156	return __nfs_revalidate_inode(server, inode);
1157}
1158EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1159
1160static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1161{
1162	struct nfs_inode *nfsi = NFS_I(inode);
1163	int ret;
1164
 
1165	if (mapping->nrpages != 0) {
1166		if (S_ISREG(inode->i_mode)) {
1167			ret = nfs_sync_mapping(mapping);
1168			if (ret < 0)
1169				return ret;
1170		}
1171		ret = invalidate_inode_pages2(mapping);
1172		if (ret < 0)
1173			return ret;
1174	}
1175	if (S_ISDIR(inode->i_mode)) {
1176		spin_lock(&inode->i_lock);
1177		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1178		spin_unlock(&inode->i_lock);
1179	}
1180	nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1181	nfs_fscache_wait_on_invalidate(inode);
1182
1183	dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1184			inode->i_sb->s_id,
1185			(unsigned long long)NFS_FILEID(inode));
1186	return 0;
1187}
1188
1189bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1190{
1191	return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1192		NFS_STALE(inode);
1193}
1194
1195int nfs_revalidate_mapping_rcu(struct inode *inode)
1196{
1197	struct nfs_inode *nfsi = NFS_I(inode);
1198	unsigned long *bitlock = &nfsi->flags;
1199	int ret = 0;
1200
1201	if (IS_SWAPFILE(inode))
1202		goto out;
1203	if (nfs_mapping_need_revalidate_inode(inode)) {
1204		ret = -ECHILD;
1205		goto out;
1206	}
1207	spin_lock(&inode->i_lock);
1208	if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1209	    (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1210		ret = -ECHILD;
1211	spin_unlock(&inode->i_lock);
1212out:
1213	return ret;
1214}
1215
1216/**
1217 * nfs_revalidate_mapping - Revalidate the pagecache
1218 * @inode - pointer to host inode
1219 * @mapping - pointer to mapping
 
1220 */
1221int nfs_revalidate_mapping(struct inode *inode,
1222		struct address_space *mapping)
1223{
 
1224	struct nfs_inode *nfsi = NFS_I(inode);
1225	unsigned long *bitlock = &nfsi->flags;
1226	int ret = 0;
1227
1228	/* swapfiles are not supposed to be shared. */
1229	if (IS_SWAPFILE(inode))
1230		goto out;
1231
1232	if (nfs_mapping_need_revalidate_inode(inode)) {
1233		ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1234		if (ret < 0)
1235			goto out;
1236	}
1237
1238	/*
1239	 * We must clear NFS_INO_INVALID_DATA first to ensure that
1240	 * invalidations that come in while we're shooting down the mappings
1241	 * are respected. But, that leaves a race window where one revalidator
1242	 * can clear the flag, and then another checks it before the mapping
1243	 * gets invalidated. Fix that by serializing access to this part of
1244	 * the function.
1245	 *
1246	 * At the same time, we need to allow other tasks to see whether we
1247	 * might be in the middle of invalidating the pages, so we only set
1248	 * the bit lock here if it looks like we're going to be doing that.
1249	 */
1250	for (;;) {
1251		ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1252					 nfs_wait_bit_killable, TASK_KILLABLE);
 
1253		if (ret)
1254			goto out;
 
 
 
 
 
 
 
1255		spin_lock(&inode->i_lock);
1256		if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1257			spin_unlock(&inode->i_lock);
1258			continue;
1259		}
1260		if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1261			break;
1262		spin_unlock(&inode->i_lock);
1263		goto out;
1264	}
1265
1266	set_bit(NFS_INO_INVALIDATING, bitlock);
1267	smp_wmb();
1268	nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
 
1269	spin_unlock(&inode->i_lock);
1270	trace_nfs_invalidate_mapping_enter(inode);
1271	ret = nfs_invalidate_mapping(inode, mapping);
1272	trace_nfs_invalidate_mapping_exit(inode, ret);
1273
1274	clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1275	smp_mb__after_atomic();
1276	wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1277out:
1278	return ret;
1279}
1280
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1281static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1282{
1283	struct inode *inode = &nfsi->vfs_inode;
1284
1285	assert_spin_locked(&inode->i_lock);
1286
1287	if (!S_ISREG(inode->i_mode))
1288		return false;
1289	if (list_empty(&nfsi->open_files))
1290		return false;
1291	/* Note: This relies on nfsi->open_files being ordered with writers
1292	 *       being placed at the head of the list.
1293	 *       See nfs_inode_attach_open_context()
1294	 */
1295	return (list_first_entry(&nfsi->open_files,
1296			struct nfs_open_context,
1297			list)->mode & FMODE_WRITE) == FMODE_WRITE;
1298}
1299
1300static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1301{
1302	return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1303}
1304
1305static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1306{
 
 
1307	if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1308			&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1309			&& inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1310		inode_set_iversion_raw(inode, fattr->change_attr);
1311		if (S_ISDIR(inode->i_mode))
1312			nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
 
 
1313	}
1314	/* If we have atomic WCC data, we may update some attributes */
 
1315	if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1316			&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
1317			&& timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1318		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1319	}
1320
 
1321	if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1322			&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
1323			&& timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1324		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1325		if (S_ISDIR(inode->i_mode))
1326			nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1327	}
1328	if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1329			&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
1330			&& i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1331			&& !nfs_have_writebacks(inode)) {
 
1332		i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1333	}
1334}
1335
1336/**
1337 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1338 * @inode - pointer to inode
1339 * @fattr - updated attributes
1340 *
1341 * Verifies the attribute cache. If we have just changed the attributes,
1342 * so that fattr carries weak cache consistency data, then it may
1343 * also update the ctime/mtime/change_attribute.
1344 */
1345static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1346{
1347	struct nfs_inode *nfsi = NFS_I(inode);
1348	loff_t cur_size, new_isize;
1349	unsigned long invalid = 0;
1350
1351
1352	if (nfs_have_delegated_attributes(inode))
1353		return 0;
 
 
 
 
 
1354	/* Has the inode gone and changed behind our back? */
1355	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
 
 
 
 
1356		return -ESTALE;
1357	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
 
1358		return -ESTALE;
1359
 
1360	if (!nfs_file_has_buffered_writers(nfsi)) {
1361		/* Verify a few of the more important attributes */
1362		if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1363			invalid |= NFS_INO_INVALID_CHANGE
1364				| NFS_INO_REVAL_PAGECACHE;
1365
1366		if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
 
1367			invalid |= NFS_INO_INVALID_MTIME;
1368
1369		if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
 
1370			invalid |= NFS_INO_INVALID_CTIME;
1371
1372		if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1373			cur_size = i_size_read(inode);
1374			new_isize = nfs_size_to_loff_t(fattr->size);
1375			if (cur_size != new_isize)
1376				invalid |= NFS_INO_INVALID_SIZE
1377					| NFS_INO_REVAL_PAGECACHE;
1378		}
1379	}
1380
1381	/* Have any file permissions changed? */
1382	if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1383		invalid |= NFS_INO_INVALID_ACCESS
1384			| NFS_INO_INVALID_ACL
1385			| NFS_INO_INVALID_OTHER;
1386	if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1387		invalid |= NFS_INO_INVALID_ACCESS
1388			| NFS_INO_INVALID_ACL
1389			| NFS_INO_INVALID_OTHER;
1390	if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1391		invalid |= NFS_INO_INVALID_ACCESS
1392			| NFS_INO_INVALID_ACL
1393			| NFS_INO_INVALID_OTHER;
1394
1395	/* Has the link count changed? */
1396	if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1397		invalid |= NFS_INO_INVALID_OTHER;
1398
1399	if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
 
1400		invalid |= NFS_INO_INVALID_ATIME;
1401
1402	if (invalid != 0)
1403		nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1404
1405	nfsi->read_cache_jiffies = fattr->time_start;
1406	return 0;
1407}
1408
1409static atomic_long_t nfs_attr_generation_counter;
1410
1411static unsigned long nfs_read_attr_generation_counter(void)
1412{
1413	return atomic_long_read(&nfs_attr_generation_counter);
1414}
1415
1416unsigned long nfs_inc_attr_generation_counter(void)
1417{
1418	return atomic_long_inc_return(&nfs_attr_generation_counter);
1419}
1420EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1421
1422void nfs_fattr_init(struct nfs_fattr *fattr)
1423{
1424	fattr->valid = 0;
1425	fattr->time_start = jiffies;
1426	fattr->gencount = nfs_inc_attr_generation_counter();
1427	fattr->owner_name = NULL;
1428	fattr->group_name = NULL;
 
1429}
1430EXPORT_SYMBOL_GPL(nfs_fattr_init);
1431
1432/**
1433 * nfs_fattr_set_barrier
1434 * @fattr: attributes
1435 *
1436 * Used to set a barrier after an attribute was updated. This
1437 * barrier ensures that older attributes from RPC calls that may
1438 * have raced with our update cannot clobber these new values.
1439 * Note that you are still responsible for ensuring that other
1440 * operations which change the attribute on the server do not
1441 * collide.
1442 */
1443void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1444{
1445	fattr->gencount = nfs_inc_attr_generation_counter();
1446}
1447
1448struct nfs_fattr *nfs_alloc_fattr(void)
1449{
1450	struct nfs_fattr *fattr;
1451
1452	fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1453	if (fattr != NULL)
1454		nfs_fattr_init(fattr);
 
 
1455	return fattr;
1456}
1457EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1458
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1459struct nfs_fh *nfs_alloc_fhandle(void)
1460{
1461	struct nfs_fh *fh;
1462
1463	fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1464	if (fh != NULL)
1465		fh->size = 0;
1466	return fh;
1467}
1468EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1469
1470#ifdef NFS_DEBUG
1471/*
1472 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1473 *                             in the same way that wireshark does
1474 *
1475 * @fh: file handle
1476 *
1477 * For debugging only.
1478 */
1479u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1480{
1481	/* wireshark uses 32-bit AUTODIN crc and does a bitwise
1482	 * not on the result */
1483	return nfs_fhandle_hash(fh);
1484}
1485EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1486
1487/*
1488 * _nfs_display_fhandle - display an NFS file handle on the console
1489 *
1490 * @fh: file handle to display
1491 * @caption: display caption
1492 *
1493 * For debugging only.
1494 */
1495void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1496{
1497	unsigned short i;
1498
1499	if (fh == NULL || fh->size == 0) {
1500		printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1501		return;
1502	}
1503
1504	printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1505	       caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1506	for (i = 0; i < fh->size; i += 16) {
1507		__be32 *pos = (__be32 *)&fh->data[i];
1508
1509		switch ((fh->size - i - 1) >> 2) {
1510		case 0:
1511			printk(KERN_DEFAULT " %08x\n",
1512				be32_to_cpup(pos));
1513			break;
1514		case 1:
1515			printk(KERN_DEFAULT " %08x %08x\n",
1516				be32_to_cpup(pos), be32_to_cpup(pos + 1));
1517			break;
1518		case 2:
1519			printk(KERN_DEFAULT " %08x %08x %08x\n",
1520				be32_to_cpup(pos), be32_to_cpup(pos + 1),
1521				be32_to_cpup(pos + 2));
1522			break;
1523		default:
1524			printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1525				be32_to_cpup(pos), be32_to_cpup(pos + 1),
1526				be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1527		}
1528	}
1529}
1530EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1531#endif
1532
1533/**
1534 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1535 * @inode - pointer to inode
1536 * @fattr - attributes
1537 *
1538 * Attempt to divine whether or not an RPC call reply carrying stale
1539 * attributes got scheduled after another call carrying updated ones.
1540 *
1541 * To do so, the function first assumes that a more recent ctime means
1542 * that the attributes in fattr are newer, however it also attempt to
1543 * catch the case where ctime either didn't change, or went backwards
1544 * (if someone reset the clock on the server) by looking at whether
1545 * or not this RPC call was started after the inode was last updated.
1546 * Note also the check for wraparound of 'attr_gencount'
1547 *
1548 * The function returns 'true' if it thinks the attributes in 'fattr' are
1549 * more recent than the ones cached in the inode.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1550 *
 
 
 
 
 
 
 
 
 
1551 */
1552static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
 
1553{
1554	const struct nfs_inode *nfsi = NFS_I(inode);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1555
1556	return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1557		((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1558}
1559
1560static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
 
1561{
1562	int ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1563
1564	trace_nfs_refresh_inode_enter(inode);
1565
1566	if (nfs_inode_attrs_need_update(inode, fattr))
1567		ret = nfs_update_inode(inode, fattr);
1568	else
1569		ret = nfs_check_inode_attributes(inode, fattr);
 
 
 
 
1570
1571	trace_nfs_refresh_inode_exit(inode, ret);
1572	return ret;
1573}
1574
1575/**
1576 * nfs_refresh_inode - try to update the inode attribute cache
1577 * @inode - pointer to inode
1578 * @fattr - updated attributes
1579 *
1580 * Check that an RPC call that returned attributes has not overlapped with
1581 * other recent updates of the inode metadata, then decide whether it is
1582 * safe to do a full update of the inode attributes, or whether just to
1583 * call nfs_check_inode_attributes.
1584 */
1585int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1586{
1587	int status;
1588
1589	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1590		return 0;
1591	spin_lock(&inode->i_lock);
1592	status = nfs_refresh_inode_locked(inode, fattr);
1593	spin_unlock(&inode->i_lock);
1594
1595	return status;
1596}
1597EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1598
1599static int nfs_post_op_update_inode_locked(struct inode *inode,
1600		struct nfs_fattr *fattr, unsigned int invalid)
1601{
1602	if (S_ISDIR(inode->i_mode))
1603		invalid |= NFS_INO_INVALID_DATA;
1604	nfs_set_cache_invalid(inode, invalid);
1605	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1606		return 0;
1607	return nfs_refresh_inode_locked(inode, fattr);
1608}
1609
1610/**
1611 * nfs_post_op_update_inode - try to update the inode attribute cache
1612 * @inode - pointer to inode
1613 * @fattr - updated attributes
1614 *
1615 * After an operation that has changed the inode metadata, mark the
1616 * attribute cache as being invalid, then try to update it.
1617 *
1618 * NB: if the server didn't return any post op attributes, this
1619 * function will force the retrieval of attributes before the next
1620 * NFS request.  Thus it should be used only for operations that
1621 * are expected to change one or more attributes, to avoid
1622 * unnecessary NFS requests and trips through nfs_update_inode().
1623 */
1624int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1625{
1626	int status;
1627
1628	spin_lock(&inode->i_lock);
1629	nfs_fattr_set_barrier(fattr);
1630	status = nfs_post_op_update_inode_locked(inode, fattr,
1631			NFS_INO_INVALID_CHANGE
1632			| NFS_INO_INVALID_CTIME);
 
1633	spin_unlock(&inode->i_lock);
1634
1635	return status;
1636}
1637EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1638
1639/**
1640 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1641 * @inode - pointer to inode
1642 * @fattr - updated attributes
1643 *
1644 * After an operation that has changed the inode metadata, mark the
1645 * attribute cache as being invalid, then try to update it. Fake up
1646 * weak cache consistency data, if none exist.
1647 *
1648 * This function is mainly designed to be used by the ->write_done() functions.
1649 */
1650int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1651{
 
1652	int status;
1653
1654	/* Don't do a WCC update if these attributes are already stale */
1655	if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1656			!nfs_inode_attrs_need_update(inode, fattr)) {
 
 
 
1657		fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1658				| NFS_ATTR_FATTR_PRESIZE
1659				| NFS_ATTR_FATTR_PREMTIME
1660				| NFS_ATTR_FATTR_PRECTIME);
1661		goto out_noforce;
1662	}
1663	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1664			(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1665		fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1666		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1667	}
1668	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1669			(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1670		memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1671		fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1672	}
1673	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1674			(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1675		memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1676		fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1677	}
1678	if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1679			(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1680		fattr->pre_size = i_size_read(inode);
1681		fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1682	}
1683out_noforce:
1684	status = nfs_post_op_update_inode_locked(inode, fattr,
1685			NFS_INO_INVALID_CHANGE
1686			| NFS_INO_INVALID_CTIME
1687			| NFS_INO_INVALID_MTIME);
 
1688	return status;
1689}
1690
1691/**
1692 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1693 * @inode - pointer to inode
1694 * @fattr - updated attributes
1695 *
1696 * After an operation that has changed the inode metadata, mark the
1697 * attribute cache as being invalid, then try to update it. Fake up
1698 * weak cache consistency data, if none exist.
1699 *
1700 * This function is mainly designed to be used by the ->write_done() functions.
1701 */
1702int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1703{
1704	int status;
1705
1706	spin_lock(&inode->i_lock);
1707	nfs_fattr_set_barrier(fattr);
1708	status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1709	spin_unlock(&inode->i_lock);
1710	return status;
1711}
1712EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1713
1714
1715static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1716				    struct nfs_fattr *fattr)
1717{
1718	bool ret1 = true, ret2 = true;
1719
1720	if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1721		ret1 = (nfsi->fileid == fattr->fileid);
1722	if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1723		ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1724	return ret1 || ret2;
1725}
1726
1727/*
1728 * Many nfs protocol calls return the new file attributes after
1729 * an operation.  Here we update the inode to reflect the state
1730 * of the server's inode.
1731 *
1732 * This is a bit tricky because we have to make sure all dirty pages
1733 * have been sent off to the server before calling invalidate_inode_pages.
1734 * To make sure no other process adds more write requests while we try
1735 * our best to flush them, we make them sleep during the attribute refresh.
1736 *
1737 * A very similar scenario holds for the dir cache.
1738 */
1739static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1740{
1741	struct nfs_server *server;
1742	struct nfs_inode *nfsi = NFS_I(inode);
1743	loff_t cur_isize, new_isize;
 
1744	unsigned long invalid = 0;
1745	unsigned long now = jiffies;
1746	unsigned long save_cache_validity;
1747	bool have_writers = nfs_file_has_buffered_writers(nfsi);
1748	bool cache_revalidated = true;
 
 
1749
1750	dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1751			__func__, inode->i_sb->s_id, inode->i_ino,
1752			nfs_display_fhandle_hash(NFS_FH(inode)),
1753			atomic_read(&inode->i_count), fattr->valid);
1754
1755	if (!nfs_fileid_valid(nfsi, fattr)) {
 
 
 
 
 
 
 
 
 
1756		printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1757			"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1758			NFS_SERVER(inode)->nfs_client->cl_hostname,
1759			inode->i_sb->s_id, (long long)nfsi->fileid,
1760			(long long)fattr->fileid);
1761		goto out_err;
1762	}
1763
1764	/*
1765	 * Make sure the inode's type hasn't changed.
1766	 */
1767	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1768		/*
1769		* Big trouble! The inode has become a different object.
1770		*/
1771		printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1772				__func__, inode->i_ino, inode->i_mode, fattr->mode);
1773		goto out_err;
1774	}
1775
1776	server = NFS_SERVER(inode);
1777	/* Update the fsid? */
1778	if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1779			!nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1780			!IS_AUTOMOUNT(inode))
1781		server->fsid = fattr->fsid;
1782
 
 
 
1783	/*
1784	 * Update the read time so we don't revalidate too often.
1785	 */
1786	nfsi->read_cache_jiffies = fattr->time_start;
1787
 
 
 
1788	save_cache_validity = nfsi->cache_validity;
1789	nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1790			| NFS_INO_INVALID_ATIME
1791			| NFS_INO_REVAL_FORCED
1792			| NFS_INO_REVAL_PAGECACHE);
1793
1794	/* Do atomic weak cache consistency updates */
1795	nfs_wcc_update_inode(inode, fattr);
1796
1797	if (pnfs_layoutcommit_outstanding(inode)) {
1798		nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
 
 
 
 
1799		cache_revalidated = false;
1800	}
1801
1802	/* More cache consistency checks */
1803	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
 
 
 
 
 
 
 
 
 
1804		if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1805			dprintk("NFS: change_attr change on server for file %s/%ld\n",
1806					inode->i_sb->s_id, inode->i_ino);
1807			/* Could it be a race with writeback? */
1808			if (!have_writers) {
1809				invalid |= NFS_INO_INVALID_CHANGE
1810					| NFS_INO_INVALID_DATA
1811					| NFS_INO_INVALID_ACCESS
1812					| NFS_INO_INVALID_ACL;
 
1813				/* Force revalidate of all attributes */
1814				save_cache_validity |= NFS_INO_INVALID_CTIME
1815					| NFS_INO_INVALID_MTIME
1816					| NFS_INO_INVALID_SIZE
 
 
 
1817					| NFS_INO_INVALID_OTHER;
1818				if (S_ISDIR(inode->i_mode))
1819					nfs_force_lookup_revalidate(inode);
 
 
 
 
 
 
 
 
1820			}
1821			inode_set_iversion_raw(inode, fattr->change_attr);
1822		}
1823	} else {
1824		nfsi->cache_validity |= save_cache_validity &
1825				(NFS_INO_INVALID_CHANGE
1826				| NFS_INO_REVAL_PAGECACHE
1827				| NFS_INO_REVAL_FORCED);
1828		cache_revalidated = false;
1829	}
1830
1831	if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1832		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1833	} else if (server->caps & NFS_CAP_MTIME) {
1834		nfsi->cache_validity |= save_cache_validity &
1835				(NFS_INO_INVALID_MTIME
1836				| NFS_INO_REVAL_FORCED);
1837		cache_revalidated = false;
1838	}
1839
1840	if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1841		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1842	} else if (server->caps & NFS_CAP_CTIME) {
1843		nfsi->cache_validity |= save_cache_validity &
1844				(NFS_INO_INVALID_CTIME
1845				| NFS_INO_REVAL_FORCED);
1846		cache_revalidated = false;
1847	}
1848
1849	/* Check if our cached file size is stale */
1850	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1851		new_isize = nfs_size_to_loff_t(fattr->size);
1852		cur_isize = i_size_read(inode);
1853		if (new_isize != cur_isize) {
1854			/* Do we perhaps have any outstanding writes, or has
1855			 * the file grown beyond our last write? */
1856			if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
 
1857				i_size_write(inode, new_isize);
1858				if (!have_writers)
1859					invalid |= NFS_INO_INVALID_DATA;
1860			}
1861			dprintk("NFS: isize change on server for file %s/%ld "
1862					"(%Ld to %Ld)\n",
1863					inode->i_sb->s_id,
1864					inode->i_ino,
1865					(long long)cur_isize,
1866					(long long)new_isize);
1867		}
1868	} else {
1869		nfsi->cache_validity |= save_cache_validity &
1870				(NFS_INO_INVALID_SIZE
1871				| NFS_INO_REVAL_PAGECACHE
1872				| NFS_INO_REVAL_FORCED);
1873		cache_revalidated = false;
1874	}
1875
 
1876
1877	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1878		memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1879	else if (server->caps & NFS_CAP_ATIME) {
1880		nfsi->cache_validity |= save_cache_validity &
1881				(NFS_INO_INVALID_ATIME
1882				| NFS_INO_REVAL_FORCED);
1883		cache_revalidated = false;
1884	}
1885
1886	if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1887		if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1888			umode_t newmode = inode->i_mode & S_IFMT;
1889			newmode |= fattr->mode & S_IALLUGO;
1890			inode->i_mode = newmode;
1891			invalid |= NFS_INO_INVALID_ACCESS
1892				| NFS_INO_INVALID_ACL
1893				| NFS_INO_INVALID_OTHER;
1894		}
1895	} else if (server->caps & NFS_CAP_MODE) {
1896		nfsi->cache_validity |= save_cache_validity &
1897				(NFS_INO_INVALID_ACCESS
1898				| NFS_INO_INVALID_ACL
1899				| NFS_INO_INVALID_OTHER
1900				| NFS_INO_REVAL_FORCED);
1901		cache_revalidated = false;
1902	}
1903
1904	if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1905		if (!uid_eq(inode->i_uid, fattr->uid)) {
1906			invalid |= NFS_INO_INVALID_ACCESS
1907				| NFS_INO_INVALID_ACL
1908				| NFS_INO_INVALID_OTHER;
1909			inode->i_uid = fattr->uid;
1910		}
1911	} else if (server->caps & NFS_CAP_OWNER) {
1912		nfsi->cache_validity |= save_cache_validity &
1913				(NFS_INO_INVALID_ACCESS
1914				| NFS_INO_INVALID_ACL
1915				| NFS_INO_INVALID_OTHER
1916				| NFS_INO_REVAL_FORCED);
1917		cache_revalidated = false;
1918	}
1919
1920	if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1921		if (!gid_eq(inode->i_gid, fattr->gid)) {
1922			invalid |= NFS_INO_INVALID_ACCESS
1923				| NFS_INO_INVALID_ACL
1924				| NFS_INO_INVALID_OTHER;
1925			inode->i_gid = fattr->gid;
1926		}
1927	} else if (server->caps & NFS_CAP_OWNER_GROUP) {
1928		nfsi->cache_validity |= save_cache_validity &
1929				(NFS_INO_INVALID_ACCESS
1930				| NFS_INO_INVALID_ACL
1931				| NFS_INO_INVALID_OTHER
1932				| NFS_INO_REVAL_FORCED);
1933		cache_revalidated = false;
1934	}
1935
1936	if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1937		if (inode->i_nlink != fattr->nlink) {
1938			invalid |= NFS_INO_INVALID_OTHER;
1939			if (S_ISDIR(inode->i_mode))
1940				invalid |= NFS_INO_INVALID_DATA;
1941			set_nlink(inode, fattr->nlink);
1942		}
1943	} else if (server->caps & NFS_CAP_NLINK) {
1944		nfsi->cache_validity |= save_cache_validity &
1945				(NFS_INO_INVALID_OTHER
1946				| NFS_INO_REVAL_FORCED);
1947		cache_revalidated = false;
1948	}
1949
1950	if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1951		/*
1952		 * report the blocks in 512byte units
1953		 */
1954		inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1955	} else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
 
 
 
 
1956		inode->i_blocks = fattr->du.nfs2.blocks;
1957	else
1958		cache_revalidated = false;
 
1959
1960	/* Update attrtimeo value if we're out of the unstable period */
1961	if (invalid & NFS_INO_INVALID_ATTR) {
1962		invalid &= ~NFS_INO_INVALID_ATTR;
1963		nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1964		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1965		nfsi->attrtimeo_timestamp = now;
1966		/* Set barrier to be more recent than all outstanding updates */
1967		nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1968	} else {
1969		if (cache_revalidated) {
1970			if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1971				nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1972				nfsi->attrtimeo <<= 1;
1973				if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1974					nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1975			}
1976			nfsi->attrtimeo_timestamp = now;
1977		}
1978		/* Set the barrier to be more recent than this fattr */
1979		if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1980			nfsi->attr_gencount = fattr->gencount;
1981	}
1982
1983	/* Don't invalidate the data if we were to blame */
1984	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1985				|| S_ISLNK(inode->i_mode)))
1986		invalid &= ~NFS_INO_INVALID_DATA;
1987	if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1988			(save_cache_validity & NFS_INO_REVAL_FORCED))
1989		nfs_set_cache_invalid(inode, invalid);
1990
1991	return 0;
1992 out_err:
1993	/*
1994	 * No need to worry about unhashing the dentry, as the
1995	 * lookup validation will know that the inode is bad.
1996	 * (But we fall through to invalidate the caches.)
1997	 */
1998	nfs_invalidate_inode(inode);
1999	return -ESTALE;
2000}
2001
2002struct inode *nfs_alloc_inode(struct super_block *sb)
2003{
2004	struct nfs_inode *nfsi;
2005	nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2006	if (!nfsi)
2007		return NULL;
2008	nfsi->flags = 0UL;
2009	nfsi->cache_validity = 0UL;
 
2010#if IS_ENABLED(CONFIG_NFS_V4)
2011	nfsi->nfs4_acl = NULL;
2012#endif /* CONFIG_NFS_V4 */
 
 
 
 
 
2013	return &nfsi->vfs_inode;
2014}
2015EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2016
2017static void nfs_i_callback(struct rcu_head *head)
2018{
2019	struct inode *inode = container_of(head, struct inode, i_rcu);
2020	kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2021}
2022
2023void nfs_destroy_inode(struct inode *inode)
2024{
2025	call_rcu(&inode->i_rcu, nfs_i_callback);
2026}
2027EXPORT_SYMBOL_GPL(nfs_destroy_inode);
2028
2029static inline void nfs4_init_once(struct nfs_inode *nfsi)
2030{
2031#if IS_ENABLED(CONFIG_NFS_V4)
2032	INIT_LIST_HEAD(&nfsi->open_states);
2033	nfsi->delegation = NULL;
2034	init_rwsem(&nfsi->rwsem);
2035	nfsi->layout = NULL;
2036#endif
2037}
2038
2039static void init_once(void *foo)
2040{
2041	struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2042
2043	inode_init_once(&nfsi->vfs_inode);
2044	INIT_LIST_HEAD(&nfsi->open_files);
2045	INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2046	INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2047	INIT_LIST_HEAD(&nfsi->commit_info.list);
2048	atomic_long_set(&nfsi->nrequests, 0);
2049	atomic_long_set(&nfsi->commit_info.ncommit, 0);
2050	atomic_set(&nfsi->commit_info.rpcs_out, 0);
2051	init_rwsem(&nfsi->rmdir_sem);
2052	mutex_init(&nfsi->commit_mutex);
2053	nfs4_init_once(nfsi);
2054}
2055
2056static int __init nfs_init_inodecache(void)
2057{
2058	nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2059					     sizeof(struct nfs_inode),
2060					     0, (SLAB_RECLAIM_ACCOUNT|
2061						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2062					     init_once);
2063	if (nfs_inode_cachep == NULL)
2064		return -ENOMEM;
2065
2066	return 0;
2067}
2068
2069static void nfs_destroy_inodecache(void)
2070{
2071	/*
2072	 * Make sure all delayed rcu free inodes are flushed before we
2073	 * destroy cache.
2074	 */
2075	rcu_barrier();
2076	kmem_cache_destroy(nfs_inode_cachep);
2077}
2078
 
2079struct workqueue_struct *nfsiod_workqueue;
2080EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2081
2082/*
2083 * start up the nfsiod workqueue
2084 */
2085static int nfsiod_start(void)
2086{
2087	struct workqueue_struct *wq;
2088	dprintk("RPC:       creating workqueue nfsiod\n");
2089	wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2090	if (wq == NULL)
2091		return -ENOMEM;
2092	nfsiod_workqueue = wq;
2093	return 0;
 
 
 
 
 
 
 
2094}
2095
2096/*
2097 * Destroy the nfsiod workqueue
2098 */
2099static void nfsiod_stop(void)
2100{
2101	struct workqueue_struct *wq;
2102
2103	wq = nfsiod_workqueue;
2104	if (wq == NULL)
2105		return;
2106	nfsiod_workqueue = NULL;
2107	destroy_workqueue(wq);
 
 
 
 
 
 
 
 
 
 
 
2108}
2109
2110unsigned int nfs_net_id;
2111EXPORT_SYMBOL_GPL(nfs_net_id);
2112
2113static int nfs_net_init(struct net *net)
2114{
 
 
2115	nfs_clients_init(net);
 
 
 
 
 
 
2116	return nfs_fs_proc_net_init(net);
2117}
2118
2119static void nfs_net_exit(struct net *net)
2120{
2121	struct nfs_net *nn = net_generic(net, nfs_net_id);
2122
2123	nfs_fs_proc_net_exit(net);
2124	nfs_cleanup_cb_ident_idr(net);
2125	WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2126	WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
2127}
2128
2129static struct pernet_operations nfs_net_ops = {
2130	.init = nfs_net_init,
2131	.exit = nfs_net_exit,
2132	.id   = &nfs_net_id,
2133	.size = sizeof(struct nfs_net),
2134};
2135
2136/*
2137 * Initialize NFS
2138 */
2139static int __init init_nfs_fs(void)
2140{
2141	int err;
2142
2143	err = register_pernet_subsys(&nfs_net_ops);
2144	if (err < 0)
2145		goto out9;
2146
2147	err = nfs_fscache_register();
2148	if (err < 0)
2149		goto out8;
2150
2151	err = nfsiod_start();
2152	if (err)
2153		goto out7;
2154
2155	err = nfs_fs_proc_init();
2156	if (err)
2157		goto out6;
2158
2159	err = nfs_init_nfspagecache();
2160	if (err)
2161		goto out5;
2162
2163	err = nfs_init_inodecache();
2164	if (err)
2165		goto out4;
2166
2167	err = nfs_init_readpagecache();
2168	if (err)
2169		goto out3;
2170
2171	err = nfs_init_writepagecache();
2172	if (err)
2173		goto out2;
2174
2175	err = nfs_init_directcache();
2176	if (err)
2177		goto out1;
2178
2179	rpc_proc_register(&init_net, &nfs_rpcstat);
2180
2181	err = register_nfs_fs();
2182	if (err)
2183		goto out0;
2184
2185	return 0;
2186out0:
2187	rpc_proc_unregister(&init_net, "nfs");
2188	nfs_destroy_directcache();
2189out1:
2190	nfs_destroy_writepagecache();
2191out2:
2192	nfs_destroy_readpagecache();
2193out3:
2194	nfs_destroy_inodecache();
2195out4:
2196	nfs_destroy_nfspagecache();
2197out5:
2198	nfs_fs_proc_exit();
2199out6:
2200	nfsiod_stop();
2201out7:
2202	nfs_fscache_unregister();
2203out8:
2204	unregister_pernet_subsys(&nfs_net_ops);
2205out9:
 
 
2206	return err;
2207}
2208
2209static void __exit exit_nfs_fs(void)
2210{
2211	nfs_destroy_directcache();
2212	nfs_destroy_writepagecache();
2213	nfs_destroy_readpagecache();
2214	nfs_destroy_inodecache();
2215	nfs_destroy_nfspagecache();
2216	nfs_fscache_unregister();
2217	unregister_pernet_subsys(&nfs_net_ops);
2218	rpc_proc_unregister(&init_net, "nfs");
2219	unregister_nfs_fs();
2220	nfs_fs_proc_exit();
2221	nfsiod_stop();
 
2222}
2223
2224/* Not quite true; I just maintain it */
2225MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 
2226MODULE_LICENSE("GPL");
2227module_param(enable_ino64, bool, 0644);
2228
2229module_init(init_nfs_fs)
2230module_exit(exit_nfs_fs)