xref: /openbmc/linux/fs/nfs/inode.c (revision ee8a99bd)
1 /*
2  *  linux/fs/nfs/inode.c
3  *
4  *  Copyright (C) 1992  Rick Sladkey
5  *
6  *  nfs inode and superblock handling functions
7  *
8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
10  *
11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12  *  J.S.Peatfield@damtp.cam.ac.uk
13  *
14  */
15 
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/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/crc32.h>
42 
43 #include <asm/uaccess.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 
55 #define NFSDBG_FACILITY		NFSDBG_VFS
56 
57 #define NFS_64_BIT_INODE_NUMBERS_ENABLED	1
58 
59 /* Default is to see 64-bit inode numbers */
60 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
61 
62 static void nfs_invalidate_inode(struct inode *);
63 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
64 
65 static struct kmem_cache * nfs_inode_cachep;
66 
67 static inline unsigned long
68 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
69 {
70 	return nfs_fileid_to_ino_t(fattr->fileid);
71 }
72 
73 /**
74  * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
75  * @word: long word containing the bit lock
76  */
77 int nfs_wait_bit_killable(void *word)
78 {
79 	if (fatal_signal_pending(current))
80 		return -ERESTARTSYS;
81 	freezable_schedule_unsafe();
82 	return 0;
83 }
84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
85 
86 /**
87  * nfs_compat_user_ino64 - returns the user-visible inode number
88  * @fileid: 64-bit fileid
89  *
90  * This function returns a 32-bit inode number if the boot parameter
91  * nfs.enable_ino64 is zero.
92  */
93 u64 nfs_compat_user_ino64(u64 fileid)
94 {
95 #ifdef CONFIG_COMPAT
96 	compat_ulong_t ino;
97 #else
98 	unsigned long ino;
99 #endif
100 
101 	if (enable_ino64)
102 		return fileid;
103 	ino = fileid;
104 	if (sizeof(ino) < sizeof(fileid))
105 		ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
106 	return ino;
107 }
108 
109 int nfs_drop_inode(struct inode *inode)
110 {
111 	return NFS_STALE(inode) || generic_drop_inode(inode);
112 }
113 EXPORT_SYMBOL_GPL(nfs_drop_inode);
114 
115 void nfs_clear_inode(struct inode *inode)
116 {
117 	/*
118 	 * The following should never happen...
119 	 */
120 	WARN_ON_ONCE(nfs_have_writebacks(inode));
121 	WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
122 	nfs_zap_acl_cache(inode);
123 	nfs_access_zap_cache(inode);
124 	nfs_fscache_release_inode_cookie(inode);
125 }
126 EXPORT_SYMBOL_GPL(nfs_clear_inode);
127 
128 void nfs_evict_inode(struct inode *inode)
129 {
130 	truncate_inode_pages(&inode->i_data, 0);
131 	clear_inode(inode);
132 	nfs_clear_inode(inode);
133 }
134 
135 /**
136  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
137  */
138 int nfs_sync_mapping(struct address_space *mapping)
139 {
140 	int ret = 0;
141 
142 	if (mapping->nrpages != 0) {
143 		unmap_mapping_range(mapping, 0, 0, 0);
144 		ret = nfs_wb_all(mapping->host);
145 	}
146 	return ret;
147 }
148 
149 /*
150  * Invalidate the local caches
151  */
152 static void nfs_zap_caches_locked(struct inode *inode)
153 {
154 	struct nfs_inode *nfsi = NFS_I(inode);
155 	int mode = inode->i_mode;
156 
157 	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
158 
159 	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
160 	nfsi->attrtimeo_timestamp = jiffies;
161 
162 	memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
163 	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
164 		nfs_fscache_invalidate(inode);
165 		nfsi->cache_validity |= NFS_INO_INVALID_ATTR
166 					| NFS_INO_INVALID_LABEL
167 					| NFS_INO_INVALID_DATA
168 					| NFS_INO_INVALID_ACCESS
169 					| NFS_INO_INVALID_ACL
170 					| NFS_INO_REVAL_PAGECACHE;
171 	} else
172 		nfsi->cache_validity |= NFS_INO_INVALID_ATTR
173 					| NFS_INO_INVALID_LABEL
174 					| NFS_INO_INVALID_ACCESS
175 					| NFS_INO_INVALID_ACL
176 					| NFS_INO_REVAL_PAGECACHE;
177 }
178 
179 void nfs_zap_caches(struct inode *inode)
180 {
181 	spin_lock(&inode->i_lock);
182 	nfs_zap_caches_locked(inode);
183 	spin_unlock(&inode->i_lock);
184 }
185 
186 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
187 {
188 	if (mapping->nrpages != 0) {
189 		spin_lock(&inode->i_lock);
190 		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
191 		nfs_fscache_invalidate(inode);
192 		spin_unlock(&inode->i_lock);
193 	}
194 }
195 
196 void nfs_zap_acl_cache(struct inode *inode)
197 {
198 	void (*clear_acl_cache)(struct inode *);
199 
200 	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
201 	if (clear_acl_cache != NULL)
202 		clear_acl_cache(inode);
203 	spin_lock(&inode->i_lock);
204 	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
205 	spin_unlock(&inode->i_lock);
206 }
207 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
208 
209 void nfs_invalidate_atime(struct inode *inode)
210 {
211 	spin_lock(&inode->i_lock);
212 	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
213 	spin_unlock(&inode->i_lock);
214 }
215 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
216 
217 /*
218  * Invalidate, but do not unhash, the inode.
219  * NB: must be called with inode->i_lock held!
220  */
221 static void nfs_invalidate_inode(struct inode *inode)
222 {
223 	set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
224 	nfs_zap_caches_locked(inode);
225 }
226 
227 struct nfs_find_desc {
228 	struct nfs_fh		*fh;
229 	struct nfs_fattr	*fattr;
230 };
231 
232 /*
233  * In NFSv3 we can have 64bit inode numbers. In order to support
234  * this, and re-exported directories (also seen in NFSv2)
235  * we are forced to allow 2 different inodes to have the same
236  * i_ino.
237  */
238 static int
239 nfs_find_actor(struct inode *inode, void *opaque)
240 {
241 	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
242 	struct nfs_fh		*fh = desc->fh;
243 	struct nfs_fattr	*fattr = desc->fattr;
244 
245 	if (NFS_FILEID(inode) != fattr->fileid)
246 		return 0;
247 	if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
248 		return 0;
249 	if (nfs_compare_fh(NFS_FH(inode), fh))
250 		return 0;
251 	if (is_bad_inode(inode) || NFS_STALE(inode))
252 		return 0;
253 	return 1;
254 }
255 
256 static int
257 nfs_init_locked(struct inode *inode, void *opaque)
258 {
259 	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
260 	struct nfs_fattr	*fattr = desc->fattr;
261 
262 	set_nfs_fileid(inode, fattr->fileid);
263 	nfs_copy_fh(NFS_FH(inode), desc->fh);
264 	return 0;
265 }
266 
267 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
268 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
269 					struct nfs4_label *label)
270 {
271 	int error;
272 
273 	if (label == NULL)
274 		return;
275 
276 	if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL) == 0)
277 		return;
278 
279 	if (NFS_SERVER(inode)->nfs_client->cl_minorversion < 2)
280 		return;
281 
282 	if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
283 		error = security_inode_notifysecctx(inode, label->label,
284 				label->len);
285 		if (error)
286 			printk(KERN_ERR "%s() %s %d "
287 					"security_inode_notifysecctx() %d\n",
288 					__func__,
289 					(char *)label->label,
290 					label->len, error);
291 	}
292 }
293 
294 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
295 {
296 	struct nfs4_label *label = NULL;
297 	int minor_version = server->nfs_client->cl_minorversion;
298 
299 	if (minor_version < 2)
300 		return label;
301 
302 	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
303 		return label;
304 
305 	label = kzalloc(sizeof(struct nfs4_label), flags);
306 	if (label == NULL)
307 		return ERR_PTR(-ENOMEM);
308 
309 	label->label = kzalloc(NFS4_MAXLABELLEN, flags);
310 	if (label->label == NULL) {
311 		kfree(label);
312 		return ERR_PTR(-ENOMEM);
313 	}
314 	label->len = NFS4_MAXLABELLEN;
315 
316 	return label;
317 }
318 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
319 #else
320 void inline nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
321 					struct nfs4_label *label)
322 {
323 }
324 #endif
325 EXPORT_SYMBOL_GPL(nfs_setsecurity);
326 
327 /*
328  * This is our front-end to iget that looks up inodes by file handle
329  * instead of inode number.
330  */
331 struct inode *
332 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
333 {
334 	struct nfs_find_desc desc = {
335 		.fh	= fh,
336 		.fattr	= fattr
337 	};
338 	struct inode *inode = ERR_PTR(-ENOENT);
339 	unsigned long hash;
340 
341 	nfs_attr_check_mountpoint(sb, fattr);
342 
343 	if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
344 	    !nfs_attr_use_mounted_on_fileid(fattr))
345 		goto out_no_inode;
346 	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
347 		goto out_no_inode;
348 
349 	hash = nfs_fattr_to_ino_t(fattr);
350 
351 	inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
352 	if (inode == NULL) {
353 		inode = ERR_PTR(-ENOMEM);
354 		goto out_no_inode;
355 	}
356 
357 	if (inode->i_state & I_NEW) {
358 		struct nfs_inode *nfsi = NFS_I(inode);
359 		unsigned long now = jiffies;
360 
361 		/* We set i_ino for the few things that still rely on it,
362 		 * such as stat(2) */
363 		inode->i_ino = hash;
364 
365 		/* We can't support update_atime(), since the server will reset it */
366 		inode->i_flags |= S_NOATIME|S_NOCMTIME;
367 		inode->i_mode = fattr->mode;
368 		if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
369 				&& nfs_server_capable(inode, NFS_CAP_MODE))
370 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
371 		/* Why so? Because we want revalidate for devices/FIFOs, and
372 		 * that's precisely what we have in nfs_file_inode_operations.
373 		 */
374 		inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
375 		if (S_ISREG(inode->i_mode)) {
376 			inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
377 			inode->i_data.a_ops = &nfs_file_aops;
378 			inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
379 		} else if (S_ISDIR(inode->i_mode)) {
380 			inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
381 			inode->i_fop = &nfs_dir_operations;
382 			inode->i_data.a_ops = &nfs_dir_aops;
383 			/* Deal with crossing mountpoints */
384 			if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
385 					fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
386 				if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
387 					inode->i_op = &nfs_referral_inode_operations;
388 				else
389 					inode->i_op = &nfs_mountpoint_inode_operations;
390 				inode->i_fop = NULL;
391 				inode->i_flags |= S_AUTOMOUNT;
392 			}
393 		} else if (S_ISLNK(inode->i_mode))
394 			inode->i_op = &nfs_symlink_inode_operations;
395 		else
396 			init_special_inode(inode, inode->i_mode, fattr->rdev);
397 
398 		memset(&inode->i_atime, 0, sizeof(inode->i_atime));
399 		memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
400 		memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
401 		inode->i_version = 0;
402 		inode->i_size = 0;
403 		clear_nlink(inode);
404 		inode->i_uid = make_kuid(&init_user_ns, -2);
405 		inode->i_gid = make_kgid(&init_user_ns, -2);
406 		inode->i_blocks = 0;
407 		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
408 		nfsi->write_io = 0;
409 		nfsi->read_io = 0;
410 
411 		nfsi->read_cache_jiffies = fattr->time_start;
412 		nfsi->attr_gencount = fattr->gencount;
413 		if (fattr->valid & NFS_ATTR_FATTR_ATIME)
414 			inode->i_atime = fattr->atime;
415 		else if (nfs_server_capable(inode, NFS_CAP_ATIME))
416 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
417 		if (fattr->valid & NFS_ATTR_FATTR_MTIME)
418 			inode->i_mtime = fattr->mtime;
419 		else if (nfs_server_capable(inode, NFS_CAP_MTIME))
420 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
421 		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
422 			inode->i_ctime = fattr->ctime;
423 		else if (nfs_server_capable(inode, NFS_CAP_CTIME))
424 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
425 		if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
426 			inode->i_version = fattr->change_attr;
427 		else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
428 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
429 		if (fattr->valid & NFS_ATTR_FATTR_SIZE)
430 			inode->i_size = nfs_size_to_loff_t(fattr->size);
431 		else
432 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR
433 				| NFS_INO_REVAL_PAGECACHE;
434 		if (fattr->valid & NFS_ATTR_FATTR_NLINK)
435 			set_nlink(inode, fattr->nlink);
436 		else if (nfs_server_capable(inode, NFS_CAP_NLINK))
437 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
438 		if (fattr->valid & NFS_ATTR_FATTR_OWNER)
439 			inode->i_uid = fattr->uid;
440 		else if (nfs_server_capable(inode, NFS_CAP_OWNER))
441 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
442 		if (fattr->valid & NFS_ATTR_FATTR_GROUP)
443 			inode->i_gid = fattr->gid;
444 		else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
445 			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
446 		if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
447 			inode->i_blocks = fattr->du.nfs2.blocks;
448 		if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
449 			/*
450 			 * report the blocks in 512byte units
451 			 */
452 			inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
453 		}
454 
455 		nfs_setsecurity(inode, fattr, label);
456 
457 		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
458 		nfsi->attrtimeo_timestamp = now;
459 		nfsi->access_cache = RB_ROOT;
460 
461 		nfs_fscache_init_inode_cookie(inode);
462 
463 		unlock_new_inode(inode);
464 	} else
465 		nfs_refresh_inode(inode, fattr);
466 	dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
467 		inode->i_sb->s_id,
468 		(long long)NFS_FILEID(inode),
469 		nfs_display_fhandle_hash(fh),
470 		atomic_read(&inode->i_count));
471 
472 out:
473 	return inode;
474 
475 out_no_inode:
476 	dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
477 	goto out;
478 }
479 EXPORT_SYMBOL_GPL(nfs_fhget);
480 
481 #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)
482 
483 int
484 nfs_setattr(struct dentry *dentry, struct iattr *attr)
485 {
486 	struct inode *inode = dentry->d_inode;
487 	struct nfs_fattr *fattr;
488 	int error = -ENOMEM;
489 
490 	nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
491 
492 	/* skip mode change if it's just for clearing setuid/setgid */
493 	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
494 		attr->ia_valid &= ~ATTR_MODE;
495 
496 	if (attr->ia_valid & ATTR_SIZE) {
497 		if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
498 			attr->ia_valid &= ~ATTR_SIZE;
499 	}
500 
501 	/* Optimization: if the end result is no change, don't RPC */
502 	attr->ia_valid &= NFS_VALID_ATTRS;
503 	if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
504 		return 0;
505 
506 	/* Write all dirty data */
507 	if (S_ISREG(inode->i_mode)) {
508 		nfs_inode_dio_wait(inode);
509 		nfs_wb_all(inode);
510 	}
511 
512 	fattr = nfs_alloc_fattr();
513 	if (fattr == NULL)
514 		goto out;
515 	/*
516 	 * Return any delegations if we're going to change ACLs
517 	 */
518 	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
519 		NFS_PROTO(inode)->return_delegation(inode);
520 	error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
521 	if (error == 0)
522 		error = nfs_refresh_inode(inode, fattr);
523 	nfs_free_fattr(fattr);
524 out:
525 	return error;
526 }
527 EXPORT_SYMBOL_GPL(nfs_setattr);
528 
529 /**
530  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
531  * @inode: inode of the file used
532  * @offset: file offset to start truncating
533  *
534  * This is a copy of the common vmtruncate, but with the locking
535  * corrected to take into account the fact that NFS requires
536  * inode->i_size to be updated under the inode->i_lock.
537  */
538 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
539 {
540 	loff_t oldsize;
541 	int err;
542 
543 	err = inode_newsize_ok(inode, offset);
544 	if (err)
545 		goto out;
546 
547 	spin_lock(&inode->i_lock);
548 	oldsize = inode->i_size;
549 	i_size_write(inode, offset);
550 	spin_unlock(&inode->i_lock);
551 
552 	truncate_pagecache(inode, oldsize, offset);
553 out:
554 	return err;
555 }
556 
557 /**
558  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
559  * @inode: pointer to struct inode
560  * @attr: pointer to struct iattr
561  *
562  * Note: we do this in the *proc.c in order to ensure that
563  *       it works for things like exclusive creates too.
564  */
565 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
566 {
567 	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
568 		spin_lock(&inode->i_lock);
569 		if ((attr->ia_valid & ATTR_MODE) != 0) {
570 			int mode = attr->ia_mode & S_IALLUGO;
571 			mode |= inode->i_mode & ~S_IALLUGO;
572 			inode->i_mode = mode;
573 		}
574 		if ((attr->ia_valid & ATTR_UID) != 0)
575 			inode->i_uid = attr->ia_uid;
576 		if ((attr->ia_valid & ATTR_GID) != 0)
577 			inode->i_gid = attr->ia_gid;
578 		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
579 		spin_unlock(&inode->i_lock);
580 	}
581 	if ((attr->ia_valid & ATTR_SIZE) != 0) {
582 		nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
583 		nfs_vmtruncate(inode, attr->ia_size);
584 	}
585 }
586 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
587 
588 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
589 {
590 	struct inode *inode = dentry->d_inode;
591 	int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
592 	int err;
593 
594 	/* Flush out writes to the server in order to update c/mtime.  */
595 	if (S_ISREG(inode->i_mode)) {
596 		nfs_inode_dio_wait(inode);
597 		err = filemap_write_and_wait(inode->i_mapping);
598 		if (err)
599 			goto out;
600 	}
601 
602 	/*
603 	 * We may force a getattr if the user cares about atime.
604 	 *
605 	 * Note that we only have to check the vfsmount flags here:
606 	 *  - NFS always sets S_NOATIME by so checking it would give a
607 	 *    bogus result
608 	 *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
609 	 *    no point in checking those.
610 	 */
611  	if ((mnt->mnt_flags & MNT_NOATIME) ||
612  	    ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
613 		need_atime = 0;
614 
615 	if (need_atime)
616 		err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
617 	else
618 		err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
619 	if (!err) {
620 		generic_fillattr(inode, stat);
621 		stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
622 	}
623 out:
624 	return err;
625 }
626 EXPORT_SYMBOL_GPL(nfs_getattr);
627 
628 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
629 {
630 	atomic_set(&l_ctx->count, 1);
631 	l_ctx->lockowner.l_owner = current->files;
632 	l_ctx->lockowner.l_pid = current->tgid;
633 	INIT_LIST_HEAD(&l_ctx->list);
634 	nfs_iocounter_init(&l_ctx->io_count);
635 }
636 
637 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
638 {
639 	struct nfs_lock_context *head = &ctx->lock_context;
640 	struct nfs_lock_context *pos = head;
641 
642 	do {
643 		if (pos->lockowner.l_owner != current->files)
644 			continue;
645 		if (pos->lockowner.l_pid != current->tgid)
646 			continue;
647 		atomic_inc(&pos->count);
648 		return pos;
649 	} while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
650 	return NULL;
651 }
652 
653 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
654 {
655 	struct nfs_lock_context *res, *new = NULL;
656 	struct inode *inode = ctx->dentry->d_inode;
657 
658 	spin_lock(&inode->i_lock);
659 	res = __nfs_find_lock_context(ctx);
660 	if (res == NULL) {
661 		spin_unlock(&inode->i_lock);
662 		new = kmalloc(sizeof(*new), GFP_KERNEL);
663 		if (new == NULL)
664 			return ERR_PTR(-ENOMEM);
665 		nfs_init_lock_context(new);
666 		spin_lock(&inode->i_lock);
667 		res = __nfs_find_lock_context(ctx);
668 		if (res == NULL) {
669 			list_add_tail(&new->list, &ctx->lock_context.list);
670 			new->open_context = ctx;
671 			res = new;
672 			new = NULL;
673 		}
674 	}
675 	spin_unlock(&inode->i_lock);
676 	kfree(new);
677 	return res;
678 }
679 
680 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
681 {
682 	struct nfs_open_context *ctx = l_ctx->open_context;
683 	struct inode *inode = ctx->dentry->d_inode;
684 
685 	if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
686 		return;
687 	list_del(&l_ctx->list);
688 	spin_unlock(&inode->i_lock);
689 	kfree(l_ctx);
690 }
691 
692 /**
693  * nfs_close_context - Common close_context() routine NFSv2/v3
694  * @ctx: pointer to context
695  * @is_sync: is this a synchronous close
696  *
697  * always ensure that the attributes are up to date if we're mounted
698  * with close-to-open semantics
699  */
700 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
701 {
702 	struct inode *inode;
703 	struct nfs_server *server;
704 
705 	if (!(ctx->mode & FMODE_WRITE))
706 		return;
707 	if (!is_sync)
708 		return;
709 	inode = ctx->dentry->d_inode;
710 	if (!list_empty(&NFS_I(inode)->open_files))
711 		return;
712 	server = NFS_SERVER(inode);
713 	if (server->flags & NFS_MOUNT_NOCTO)
714 		return;
715 	nfs_revalidate_inode(server, inode);
716 }
717 EXPORT_SYMBOL_GPL(nfs_close_context);
718 
719 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
720 {
721 	struct nfs_open_context *ctx;
722 	struct rpc_cred *cred = rpc_lookup_cred();
723 	if (IS_ERR(cred))
724 		return ERR_CAST(cred);
725 
726 	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
727 	if (!ctx) {
728 		put_rpccred(cred);
729 		return ERR_PTR(-ENOMEM);
730 	}
731 	nfs_sb_active(dentry->d_sb);
732 	ctx->dentry = dget(dentry);
733 	ctx->cred = cred;
734 	ctx->state = NULL;
735 	ctx->mode = f_mode;
736 	ctx->flags = 0;
737 	ctx->error = 0;
738 	nfs_init_lock_context(&ctx->lock_context);
739 	ctx->lock_context.open_context = ctx;
740 	INIT_LIST_HEAD(&ctx->list);
741 	ctx->mdsthreshold = NULL;
742 	return ctx;
743 }
744 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
745 
746 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
747 {
748 	if (ctx != NULL)
749 		atomic_inc(&ctx->lock_context.count);
750 	return ctx;
751 }
752 EXPORT_SYMBOL_GPL(get_nfs_open_context);
753 
754 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
755 {
756 	struct inode *inode = ctx->dentry->d_inode;
757 	struct super_block *sb = ctx->dentry->d_sb;
758 
759 	if (!list_empty(&ctx->list)) {
760 		if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
761 			return;
762 		list_del(&ctx->list);
763 		spin_unlock(&inode->i_lock);
764 	} else if (!atomic_dec_and_test(&ctx->lock_context.count))
765 		return;
766 	if (inode != NULL)
767 		NFS_PROTO(inode)->close_context(ctx, is_sync);
768 	if (ctx->cred != NULL)
769 		put_rpccred(ctx->cred);
770 	dput(ctx->dentry);
771 	nfs_sb_deactive(sb);
772 	kfree(ctx->mdsthreshold);
773 	kfree(ctx);
774 }
775 
776 void put_nfs_open_context(struct nfs_open_context *ctx)
777 {
778 	__put_nfs_open_context(ctx, 0);
779 }
780 EXPORT_SYMBOL_GPL(put_nfs_open_context);
781 
782 /*
783  * Ensure that mmap has a recent RPC credential for use when writing out
784  * shared pages
785  */
786 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
787 {
788 	struct inode *inode = ctx->dentry->d_inode;
789 	struct nfs_inode *nfsi = NFS_I(inode);
790 
791 	spin_lock(&inode->i_lock);
792 	list_add(&ctx->list, &nfsi->open_files);
793 	spin_unlock(&inode->i_lock);
794 }
795 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
796 
797 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
798 {
799 	filp->private_data = get_nfs_open_context(ctx);
800 	if (list_empty(&ctx->list))
801 		nfs_inode_attach_open_context(ctx);
802 }
803 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
804 
805 /*
806  * Given an inode, search for an open context with the desired characteristics
807  */
808 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
809 {
810 	struct nfs_inode *nfsi = NFS_I(inode);
811 	struct nfs_open_context *pos, *ctx = NULL;
812 
813 	spin_lock(&inode->i_lock);
814 	list_for_each_entry(pos, &nfsi->open_files, list) {
815 		if (cred != NULL && pos->cred != cred)
816 			continue;
817 		if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
818 			continue;
819 		ctx = get_nfs_open_context(pos);
820 		break;
821 	}
822 	spin_unlock(&inode->i_lock);
823 	return ctx;
824 }
825 
826 static void nfs_file_clear_open_context(struct file *filp)
827 {
828 	struct nfs_open_context *ctx = nfs_file_open_context(filp);
829 
830 	if (ctx) {
831 		struct inode *inode = ctx->dentry->d_inode;
832 
833 		filp->private_data = NULL;
834 		spin_lock(&inode->i_lock);
835 		list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
836 		spin_unlock(&inode->i_lock);
837 		__put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
838 	}
839 }
840 
841 /*
842  * These allocate and release file read/write context information.
843  */
844 int nfs_open(struct inode *inode, struct file *filp)
845 {
846 	struct nfs_open_context *ctx;
847 
848 	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
849 	if (IS_ERR(ctx))
850 		return PTR_ERR(ctx);
851 	nfs_file_set_open_context(filp, ctx);
852 	put_nfs_open_context(ctx);
853 	nfs_fscache_set_inode_cookie(inode, filp);
854 	return 0;
855 }
856 
857 int nfs_release(struct inode *inode, struct file *filp)
858 {
859 	nfs_file_clear_open_context(filp);
860 	return 0;
861 }
862 
863 /*
864  * This function is called whenever some part of NFS notices that
865  * the cached attributes have to be refreshed.
866  */
867 int
868 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
869 {
870 	int		 status = -ESTALE;
871 	struct nfs4_label *label = NULL;
872 	struct nfs_fattr *fattr = NULL;
873 	struct nfs_inode *nfsi = NFS_I(inode);
874 
875 	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
876 		inode->i_sb->s_id, (long long)NFS_FILEID(inode));
877 
878 	if (is_bad_inode(inode))
879 		goto out;
880 	if (NFS_STALE(inode))
881 		goto out;
882 
883 	status = -ENOMEM;
884 	fattr = nfs_alloc_fattr();
885 	if (fattr == NULL)
886 		goto out;
887 
888 	nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
889 
890 	label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
891 	if (IS_ERR(label)) {
892 		status = PTR_ERR(label);
893 		goto out;
894 	}
895 
896 	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
897 	if (status != 0) {
898 		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
899 			 inode->i_sb->s_id,
900 			 (long long)NFS_FILEID(inode), status);
901 		if (status == -ESTALE) {
902 			nfs_zap_caches(inode);
903 			if (!S_ISDIR(inode->i_mode))
904 				set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
905 		}
906 		goto err_out;
907 	}
908 
909 	status = nfs_refresh_inode(inode, fattr);
910 	if (status) {
911 		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
912 			 inode->i_sb->s_id,
913 			 (long long)NFS_FILEID(inode), status);
914 		goto err_out;
915 	}
916 
917 	if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
918 		nfs_zap_acl_cache(inode);
919 
920 	dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
921 		inode->i_sb->s_id,
922 		(long long)NFS_FILEID(inode));
923 
924 err_out:
925 	nfs4_label_free(label);
926 out:
927 	nfs_free_fattr(fattr);
928 	return status;
929 }
930 
931 int nfs_attribute_timeout(struct inode *inode)
932 {
933 	struct nfs_inode *nfsi = NFS_I(inode);
934 
935 	return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
936 }
937 
938 int nfs_attribute_cache_expired(struct inode *inode)
939 {
940 	if (nfs_have_delegated_attributes(inode))
941 		return 0;
942 	return nfs_attribute_timeout(inode);
943 }
944 
945 /**
946  * nfs_revalidate_inode - Revalidate the inode attributes
947  * @server - pointer to nfs_server struct
948  * @inode - pointer to inode struct
949  *
950  * Updates inode attribute information by retrieving the data from the server.
951  */
952 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
953 {
954 	if (!(NFS_I(inode)->cache_validity &
955 			(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
956 			&& !nfs_attribute_cache_expired(inode))
957 		return NFS_STALE(inode) ? -ESTALE : 0;
958 	return __nfs_revalidate_inode(server, inode);
959 }
960 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
961 
962 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
963 {
964 	struct nfs_inode *nfsi = NFS_I(inode);
965 	int ret;
966 
967 	if (mapping->nrpages != 0) {
968 		if (S_ISREG(inode->i_mode)) {
969 			ret = nfs_sync_mapping(mapping);
970 			if (ret < 0)
971 				return ret;
972 		}
973 		ret = invalidate_inode_pages2(mapping);
974 		if (ret < 0)
975 			return ret;
976 	}
977 	spin_lock(&inode->i_lock);
978 	nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
979 	if (S_ISDIR(inode->i_mode))
980 		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
981 	spin_unlock(&inode->i_lock);
982 	nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
983 	nfs_fscache_wait_on_invalidate(inode);
984 	dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
985 			inode->i_sb->s_id, (long long)NFS_FILEID(inode));
986 	return 0;
987 }
988 
989 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
990 {
991 	if (nfs_have_delegated_attributes(inode))
992 		return false;
993 	return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
994 		|| nfs_attribute_timeout(inode)
995 		|| NFS_STALE(inode);
996 }
997 
998 /**
999  * nfs_revalidate_mapping - Revalidate the pagecache
1000  * @inode - pointer to host inode
1001  * @mapping - pointer to mapping
1002  */
1003 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1004 {
1005 	struct nfs_inode *nfsi = NFS_I(inode);
1006 	int ret = 0;
1007 
1008 	/* swapfiles are not supposed to be shared. */
1009 	if (IS_SWAPFILE(inode))
1010 		goto out;
1011 
1012 	if (nfs_mapping_need_revalidate_inode(inode)) {
1013 		ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1014 		if (ret < 0)
1015 			goto out;
1016 	}
1017 	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1018 		ret = nfs_invalidate_mapping(inode, mapping);
1019 out:
1020 	return ret;
1021 }
1022 
1023 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1024 {
1025 	struct nfs_inode *nfsi = NFS_I(inode);
1026 	unsigned long ret = 0;
1027 
1028 	if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1029 			&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1030 			&& inode->i_version == fattr->pre_change_attr) {
1031 		inode->i_version = fattr->change_attr;
1032 		if (S_ISDIR(inode->i_mode))
1033 			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1034 		ret |= NFS_INO_INVALID_ATTR;
1035 	}
1036 	/* If we have atomic WCC data, we may update some attributes */
1037 	if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1038 			&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
1039 			&& timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1040 		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1041 		ret |= NFS_INO_INVALID_ATTR;
1042 	}
1043 
1044 	if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1045 			&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
1046 			&& timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1047 		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1048 		if (S_ISDIR(inode->i_mode))
1049 			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1050 		ret |= NFS_INO_INVALID_ATTR;
1051 	}
1052 	if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1053 			&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
1054 			&& i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1055 			&& nfsi->npages == 0) {
1056 		i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1057 		ret |= NFS_INO_INVALID_ATTR;
1058 	}
1059 
1060 	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1061 		nfs_fscache_invalidate(inode);
1062 
1063 	return ret;
1064 }
1065 
1066 /**
1067  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1068  * @inode - pointer to inode
1069  * @fattr - updated attributes
1070  *
1071  * Verifies the attribute cache. If we have just changed the attributes,
1072  * so that fattr carries weak cache consistency data, then it may
1073  * also update the ctime/mtime/change_attribute.
1074  */
1075 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1076 {
1077 	struct nfs_inode *nfsi = NFS_I(inode);
1078 	loff_t cur_size, new_isize;
1079 	unsigned long invalid = 0;
1080 
1081 
1082 	if (nfs_have_delegated_attributes(inode))
1083 		return 0;
1084 	/* Has the inode gone and changed behind our back? */
1085 	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1086 		return -EIO;
1087 	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1088 		return -EIO;
1089 
1090 	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1091 			inode->i_version != fattr->change_attr)
1092 		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1093 
1094 	/* Verify a few of the more important attributes */
1095 	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1096 		invalid |= NFS_INO_INVALID_ATTR;
1097 
1098 	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1099 		cur_size = i_size_read(inode);
1100 		new_isize = nfs_size_to_loff_t(fattr->size);
1101 		if (cur_size != new_isize && nfsi->npages == 0)
1102 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1103 	}
1104 
1105 	/* Have any file permissions changed? */
1106 	if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1107 		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1108 	if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1109 		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1110 	if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1111 		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1112 
1113 	/* Has the link count changed? */
1114 	if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1115 		invalid |= NFS_INO_INVALID_ATTR;
1116 
1117 	if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1118 		invalid |= NFS_INO_INVALID_ATIME;
1119 
1120 	if (invalid != 0)
1121 		nfsi->cache_validity |= invalid;
1122 
1123 	nfsi->read_cache_jiffies = fattr->time_start;
1124 	return 0;
1125 }
1126 
1127 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1128 {
1129 	if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1130 		return 0;
1131 	return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1132 }
1133 
1134 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1135 {
1136 	if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1137 		return 0;
1138 	return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1139 }
1140 
1141 static atomic_long_t nfs_attr_generation_counter;
1142 
1143 static unsigned long nfs_read_attr_generation_counter(void)
1144 {
1145 	return atomic_long_read(&nfs_attr_generation_counter);
1146 }
1147 
1148 unsigned long nfs_inc_attr_generation_counter(void)
1149 {
1150 	return atomic_long_inc_return(&nfs_attr_generation_counter);
1151 }
1152 
1153 void nfs_fattr_init(struct nfs_fattr *fattr)
1154 {
1155 	fattr->valid = 0;
1156 	fattr->time_start = jiffies;
1157 	fattr->gencount = nfs_inc_attr_generation_counter();
1158 	fattr->owner_name = NULL;
1159 	fattr->group_name = NULL;
1160 }
1161 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1162 
1163 struct nfs_fattr *nfs_alloc_fattr(void)
1164 {
1165 	struct nfs_fattr *fattr;
1166 
1167 	fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1168 	if (fattr != NULL)
1169 		nfs_fattr_init(fattr);
1170 	return fattr;
1171 }
1172 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1173 
1174 struct nfs_fh *nfs_alloc_fhandle(void)
1175 {
1176 	struct nfs_fh *fh;
1177 
1178 	fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1179 	if (fh != NULL)
1180 		fh->size = 0;
1181 	return fh;
1182 }
1183 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1184 
1185 #ifdef NFS_DEBUG
1186 /*
1187  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1188  *                             in the same way that wireshark does
1189  *
1190  * @fh: file handle
1191  *
1192  * For debugging only.
1193  */
1194 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1195 {
1196 	/* wireshark uses 32-bit AUTODIN crc and does a bitwise
1197 	 * not on the result */
1198 	return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1199 }
1200 
1201 /*
1202  * _nfs_display_fhandle - display an NFS file handle on the console
1203  *
1204  * @fh: file handle to display
1205  * @caption: display caption
1206  *
1207  * For debugging only.
1208  */
1209 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1210 {
1211 	unsigned short i;
1212 
1213 	if (fh == NULL || fh->size == 0) {
1214 		printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1215 		return;
1216 	}
1217 
1218 	printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1219 	       caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1220 	for (i = 0; i < fh->size; i += 16) {
1221 		__be32 *pos = (__be32 *)&fh->data[i];
1222 
1223 		switch ((fh->size - i - 1) >> 2) {
1224 		case 0:
1225 			printk(KERN_DEFAULT " %08x\n",
1226 				be32_to_cpup(pos));
1227 			break;
1228 		case 1:
1229 			printk(KERN_DEFAULT " %08x %08x\n",
1230 				be32_to_cpup(pos), be32_to_cpup(pos + 1));
1231 			break;
1232 		case 2:
1233 			printk(KERN_DEFAULT " %08x %08x %08x\n",
1234 				be32_to_cpup(pos), be32_to_cpup(pos + 1),
1235 				be32_to_cpup(pos + 2));
1236 			break;
1237 		default:
1238 			printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1239 				be32_to_cpup(pos), be32_to_cpup(pos + 1),
1240 				be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1241 		}
1242 	}
1243 }
1244 #endif
1245 
1246 /**
1247  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1248  * @inode - pointer to inode
1249  * @fattr - attributes
1250  *
1251  * Attempt to divine whether or not an RPC call reply carrying stale
1252  * attributes got scheduled after another call carrying updated ones.
1253  *
1254  * To do so, the function first assumes that a more recent ctime means
1255  * that the attributes in fattr are newer, however it also attempt to
1256  * catch the case where ctime either didn't change, or went backwards
1257  * (if someone reset the clock on the server) by looking at whether
1258  * or not this RPC call was started after the inode was last updated.
1259  * Note also the check for wraparound of 'attr_gencount'
1260  *
1261  * The function returns 'true' if it thinks the attributes in 'fattr' are
1262  * more recent than the ones cached in the inode.
1263  *
1264  */
1265 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1266 {
1267 	const struct nfs_inode *nfsi = NFS_I(inode);
1268 
1269 	return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1270 		nfs_ctime_need_update(inode, fattr) ||
1271 		nfs_size_need_update(inode, fattr) ||
1272 		((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1273 }
1274 
1275 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1276 {
1277 	if (nfs_inode_attrs_need_update(inode, fattr))
1278 		return nfs_update_inode(inode, fattr);
1279 	return nfs_check_inode_attributes(inode, fattr);
1280 }
1281 
1282 /**
1283  * nfs_refresh_inode - try to update the inode attribute cache
1284  * @inode - pointer to inode
1285  * @fattr - updated attributes
1286  *
1287  * Check that an RPC call that returned attributes has not overlapped with
1288  * other recent updates of the inode metadata, then decide whether it is
1289  * safe to do a full update of the inode attributes, or whether just to
1290  * call nfs_check_inode_attributes.
1291  */
1292 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1293 {
1294 	int status;
1295 
1296 	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1297 		return 0;
1298 	spin_lock(&inode->i_lock);
1299 	status = nfs_refresh_inode_locked(inode, fattr);
1300 	spin_unlock(&inode->i_lock);
1301 
1302 	return status;
1303 }
1304 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1305 
1306 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1307 {
1308 	struct nfs_inode *nfsi = NFS_I(inode);
1309 
1310 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1311 	if (S_ISDIR(inode->i_mode)) {
1312 		nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1313 		nfs_fscache_invalidate(inode);
1314 	}
1315 	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1316 		return 0;
1317 	return nfs_refresh_inode_locked(inode, fattr);
1318 }
1319 
1320 /**
1321  * nfs_post_op_update_inode - try to update the inode attribute cache
1322  * @inode - pointer to inode
1323  * @fattr - updated attributes
1324  *
1325  * After an operation that has changed the inode metadata, mark the
1326  * attribute cache as being invalid, then try to update it.
1327  *
1328  * NB: if the server didn't return any post op attributes, this
1329  * function will force the retrieval of attributes before the next
1330  * NFS request.  Thus it should be used only for operations that
1331  * are expected to change one or more attributes, to avoid
1332  * unnecessary NFS requests and trips through nfs_update_inode().
1333  */
1334 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1335 {
1336 	int status;
1337 
1338 	spin_lock(&inode->i_lock);
1339 	status = nfs_post_op_update_inode_locked(inode, fattr);
1340 	spin_unlock(&inode->i_lock);
1341 
1342 	return status;
1343 }
1344 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1345 
1346 /**
1347  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1348  * @inode - pointer to inode
1349  * @fattr - updated attributes
1350  *
1351  * After an operation that has changed the inode metadata, mark the
1352  * attribute cache as being invalid, then try to update it. Fake up
1353  * weak cache consistency data, if none exist.
1354  *
1355  * This function is mainly designed to be used by the ->write_done() functions.
1356  */
1357 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1358 {
1359 	int status;
1360 
1361 	spin_lock(&inode->i_lock);
1362 	/* Don't do a WCC update if these attributes are already stale */
1363 	if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1364 			!nfs_inode_attrs_need_update(inode, fattr)) {
1365 		fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1366 				| NFS_ATTR_FATTR_PRESIZE
1367 				| NFS_ATTR_FATTR_PREMTIME
1368 				| NFS_ATTR_FATTR_PRECTIME);
1369 		goto out_noforce;
1370 	}
1371 	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1372 			(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1373 		fattr->pre_change_attr = inode->i_version;
1374 		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1375 	}
1376 	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1377 			(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1378 		memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1379 		fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1380 	}
1381 	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1382 			(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1383 		memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1384 		fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1385 	}
1386 	if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1387 			(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1388 		fattr->pre_size = i_size_read(inode);
1389 		fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1390 	}
1391 out_noforce:
1392 	status = nfs_post_op_update_inode_locked(inode, fattr);
1393 	spin_unlock(&inode->i_lock);
1394 	return status;
1395 }
1396 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1397 
1398 /*
1399  * Many nfs protocol calls return the new file attributes after
1400  * an operation.  Here we update the inode to reflect the state
1401  * of the server's inode.
1402  *
1403  * This is a bit tricky because we have to make sure all dirty pages
1404  * have been sent off to the server before calling invalidate_inode_pages.
1405  * To make sure no other process adds more write requests while we try
1406  * our best to flush them, we make them sleep during the attribute refresh.
1407  *
1408  * A very similar scenario holds for the dir cache.
1409  */
1410 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1411 {
1412 	struct nfs_server *server;
1413 	struct nfs_inode *nfsi = NFS_I(inode);
1414 	loff_t cur_isize, new_isize;
1415 	unsigned long invalid = 0;
1416 	unsigned long now = jiffies;
1417 	unsigned long save_cache_validity;
1418 
1419 	dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1420 			__func__, inode->i_sb->s_id, inode->i_ino,
1421 			nfs_display_fhandle_hash(NFS_FH(inode)),
1422 			atomic_read(&inode->i_count), fattr->valid);
1423 
1424 	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1425 		printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1426 			"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1427 			NFS_SERVER(inode)->nfs_client->cl_hostname,
1428 			inode->i_sb->s_id, (long long)nfsi->fileid,
1429 			(long long)fattr->fileid);
1430 		goto out_err;
1431 	}
1432 
1433 	/*
1434 	 * Make sure the inode's type hasn't changed.
1435 	 */
1436 	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1437 		/*
1438 		* Big trouble! The inode has become a different object.
1439 		*/
1440 		printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1441 				__func__, inode->i_ino, inode->i_mode, fattr->mode);
1442 		goto out_err;
1443 	}
1444 
1445 	server = NFS_SERVER(inode);
1446 	/* Update the fsid? */
1447 	if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1448 			!nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1449 			!IS_AUTOMOUNT(inode))
1450 		server->fsid = fattr->fsid;
1451 
1452 	/*
1453 	 * Update the read time so we don't revalidate too often.
1454 	 */
1455 	nfsi->read_cache_jiffies = fattr->time_start;
1456 
1457 	save_cache_validity = nfsi->cache_validity;
1458 	nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1459 			| NFS_INO_INVALID_ATIME
1460 			| NFS_INO_REVAL_FORCED
1461 			| NFS_INO_REVAL_PAGECACHE);
1462 
1463 	/* Do atomic weak cache consistency updates */
1464 	invalid |= nfs_wcc_update_inode(inode, fattr);
1465 
1466 	/* More cache consistency checks */
1467 	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1468 		if (inode->i_version != fattr->change_attr) {
1469 			dprintk("NFS: change_attr change on server for file %s/%ld\n",
1470 					inode->i_sb->s_id, inode->i_ino);
1471 			invalid |= NFS_INO_INVALID_ATTR
1472 				| NFS_INO_INVALID_DATA
1473 				| NFS_INO_INVALID_ACCESS
1474 				| NFS_INO_INVALID_ACL
1475 				| NFS_INO_REVAL_PAGECACHE;
1476 			if (S_ISDIR(inode->i_mode))
1477 				nfs_force_lookup_revalidate(inode);
1478 			inode->i_version = fattr->change_attr;
1479 		}
1480 	} else if (server->caps & NFS_CAP_CHANGE_ATTR)
1481 		invalid |= save_cache_validity;
1482 
1483 	if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1484 		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1485 	} else if (server->caps & NFS_CAP_MTIME)
1486 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1487 				| NFS_INO_REVAL_FORCED);
1488 
1489 	if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1490 		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1491 	} else if (server->caps & NFS_CAP_CTIME)
1492 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1493 				| NFS_INO_REVAL_FORCED);
1494 
1495 	/* Check if our cached file size is stale */
1496 	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1497 		new_isize = nfs_size_to_loff_t(fattr->size);
1498 		cur_isize = i_size_read(inode);
1499 		if (new_isize != cur_isize) {
1500 			/* Do we perhaps have any outstanding writes, or has
1501 			 * the file grown beyond our last write? */
1502 			if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1503 			     new_isize > cur_isize) {
1504 				i_size_write(inode, new_isize);
1505 				invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1506 			}
1507 			dprintk("NFS: isize change on server for file %s/%ld "
1508 					"(%Ld to %Ld)\n",
1509 					inode->i_sb->s_id,
1510 					inode->i_ino,
1511 					(long long)cur_isize,
1512 					(long long)new_isize);
1513 		}
1514 	} else
1515 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1516 				| NFS_INO_REVAL_PAGECACHE
1517 				| NFS_INO_REVAL_FORCED);
1518 
1519 
1520 	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1521 		memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1522 	else if (server->caps & NFS_CAP_ATIME)
1523 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1524 				| NFS_INO_REVAL_FORCED);
1525 
1526 	if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1527 		if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1528 			umode_t newmode = inode->i_mode & S_IFMT;
1529 			newmode |= fattr->mode & S_IALLUGO;
1530 			inode->i_mode = newmode;
1531 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1532 		}
1533 	} else if (server->caps & NFS_CAP_MODE)
1534 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1535 				| NFS_INO_INVALID_ACCESS
1536 				| NFS_INO_INVALID_ACL
1537 				| NFS_INO_REVAL_FORCED);
1538 
1539 	if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1540 		if (!uid_eq(inode->i_uid, fattr->uid)) {
1541 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1542 			inode->i_uid = fattr->uid;
1543 		}
1544 	} else if (server->caps & NFS_CAP_OWNER)
1545 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1546 				| NFS_INO_INVALID_ACCESS
1547 				| NFS_INO_INVALID_ACL
1548 				| NFS_INO_REVAL_FORCED);
1549 
1550 	if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1551 		if (!gid_eq(inode->i_gid, fattr->gid)) {
1552 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1553 			inode->i_gid = fattr->gid;
1554 		}
1555 	} else if (server->caps & NFS_CAP_OWNER_GROUP)
1556 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1557 				| NFS_INO_INVALID_ACCESS
1558 				| NFS_INO_INVALID_ACL
1559 				| NFS_INO_REVAL_FORCED);
1560 
1561 	if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1562 		if (inode->i_nlink != fattr->nlink) {
1563 			invalid |= NFS_INO_INVALID_ATTR;
1564 			if (S_ISDIR(inode->i_mode))
1565 				invalid |= NFS_INO_INVALID_DATA;
1566 			set_nlink(inode, fattr->nlink);
1567 		}
1568 	} else if (server->caps & NFS_CAP_NLINK)
1569 		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1570 				| NFS_INO_REVAL_FORCED);
1571 
1572 	if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1573 		/*
1574 		 * report the blocks in 512byte units
1575 		 */
1576 		inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1577  	}
1578 	if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1579 		inode->i_blocks = fattr->du.nfs2.blocks;
1580 
1581 	/* Update attrtimeo value if we're out of the unstable period */
1582 	if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
1583 		nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1584 		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1585 		nfsi->attrtimeo_timestamp = now;
1586 		nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1587 	} else {
1588 		if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1589 			if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1590 				nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1591 			nfsi->attrtimeo_timestamp = now;
1592 		}
1593 	}
1594 	invalid &= ~NFS_INO_INVALID_ATTR;
1595 	invalid &= ~NFS_INO_INVALID_LABEL;
1596 	/* Don't invalidate the data if we were to blame */
1597 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1598 				|| S_ISLNK(inode->i_mode)))
1599 		invalid &= ~NFS_INO_INVALID_DATA;
1600 	if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1601 			(save_cache_validity & NFS_INO_REVAL_FORCED))
1602 		nfsi->cache_validity |= invalid;
1603 
1604 	if (invalid & NFS_INO_INVALID_DATA)
1605 		nfs_fscache_invalidate(inode);
1606 
1607 	return 0;
1608  out_err:
1609 	/*
1610 	 * No need to worry about unhashing the dentry, as the
1611 	 * lookup validation will know that the inode is bad.
1612 	 * (But we fall through to invalidate the caches.)
1613 	 */
1614 	nfs_invalidate_inode(inode);
1615 	return -ESTALE;
1616 }
1617 
1618 struct inode *nfs_alloc_inode(struct super_block *sb)
1619 {
1620 	struct nfs_inode *nfsi;
1621 	nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1622 	if (!nfsi)
1623 		return NULL;
1624 	nfsi->flags = 0UL;
1625 	nfsi->cache_validity = 0UL;
1626 #ifdef CONFIG_NFS_V3_ACL
1627 	nfsi->acl_access = ERR_PTR(-EAGAIN);
1628 	nfsi->acl_default = ERR_PTR(-EAGAIN);
1629 #endif
1630 #if IS_ENABLED(CONFIG_NFS_V4)
1631 	nfsi->nfs4_acl = NULL;
1632 #endif /* CONFIG_NFS_V4 */
1633 	return &nfsi->vfs_inode;
1634 }
1635 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1636 
1637 static void nfs_i_callback(struct rcu_head *head)
1638 {
1639 	struct inode *inode = container_of(head, struct inode, i_rcu);
1640 	kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1641 }
1642 
1643 void nfs_destroy_inode(struct inode *inode)
1644 {
1645 	call_rcu(&inode->i_rcu, nfs_i_callback);
1646 }
1647 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1648 
1649 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1650 {
1651 #if IS_ENABLED(CONFIG_NFS_V4)
1652 	INIT_LIST_HEAD(&nfsi->open_states);
1653 	nfsi->delegation = NULL;
1654 	nfsi->delegation_state = 0;
1655 	init_rwsem(&nfsi->rwsem);
1656 	nfsi->layout = NULL;
1657 #endif
1658 }
1659 
1660 static void init_once(void *foo)
1661 {
1662 	struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1663 
1664 	inode_init_once(&nfsi->vfs_inode);
1665 	INIT_LIST_HEAD(&nfsi->open_files);
1666 	INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1667 	INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1668 	INIT_LIST_HEAD(&nfsi->commit_info.list);
1669 	nfsi->npages = 0;
1670 	nfsi->commit_info.ncommit = 0;
1671 	atomic_set(&nfsi->commit_info.rpcs_out, 0);
1672 	atomic_set(&nfsi->silly_count, 1);
1673 	INIT_HLIST_HEAD(&nfsi->silly_list);
1674 	init_waitqueue_head(&nfsi->waitqueue);
1675 	nfs4_init_once(nfsi);
1676 }
1677 
1678 static int __init nfs_init_inodecache(void)
1679 {
1680 	nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1681 					     sizeof(struct nfs_inode),
1682 					     0, (SLAB_RECLAIM_ACCOUNT|
1683 						SLAB_MEM_SPREAD),
1684 					     init_once);
1685 	if (nfs_inode_cachep == NULL)
1686 		return -ENOMEM;
1687 
1688 	return 0;
1689 }
1690 
1691 static void nfs_destroy_inodecache(void)
1692 {
1693 	/*
1694 	 * Make sure all delayed rcu free inodes are flushed before we
1695 	 * destroy cache.
1696 	 */
1697 	rcu_barrier();
1698 	kmem_cache_destroy(nfs_inode_cachep);
1699 }
1700 
1701 struct workqueue_struct *nfsiod_workqueue;
1702 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1703 
1704 /*
1705  * start up the nfsiod workqueue
1706  */
1707 static int nfsiod_start(void)
1708 {
1709 	struct workqueue_struct *wq;
1710 	dprintk("RPC:       creating workqueue nfsiod\n");
1711 	wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1712 	if (wq == NULL)
1713 		return -ENOMEM;
1714 	nfsiod_workqueue = wq;
1715 	return 0;
1716 }
1717 
1718 /*
1719  * Destroy the nfsiod workqueue
1720  */
1721 static void nfsiod_stop(void)
1722 {
1723 	struct workqueue_struct *wq;
1724 
1725 	wq = nfsiod_workqueue;
1726 	if (wq == NULL)
1727 		return;
1728 	nfsiod_workqueue = NULL;
1729 	destroy_workqueue(wq);
1730 }
1731 
1732 int nfs_net_id;
1733 EXPORT_SYMBOL_GPL(nfs_net_id);
1734 
1735 static int nfs_net_init(struct net *net)
1736 {
1737 	nfs_clients_init(net);
1738 	return 0;
1739 }
1740 
1741 static void nfs_net_exit(struct net *net)
1742 {
1743 	nfs_cleanup_cb_ident_idr(net);
1744 }
1745 
1746 static struct pernet_operations nfs_net_ops = {
1747 	.init = nfs_net_init,
1748 	.exit = nfs_net_exit,
1749 	.id   = &nfs_net_id,
1750 	.size = sizeof(struct nfs_net),
1751 };
1752 
1753 /*
1754  * Initialize NFS
1755  */
1756 static int __init init_nfs_fs(void)
1757 {
1758 	int err;
1759 
1760 	err = register_pernet_subsys(&nfs_net_ops);
1761 	if (err < 0)
1762 		goto out9;
1763 
1764 	err = nfs_fscache_register();
1765 	if (err < 0)
1766 		goto out8;
1767 
1768 	err = nfsiod_start();
1769 	if (err)
1770 		goto out7;
1771 
1772 	err = nfs_fs_proc_init();
1773 	if (err)
1774 		goto out6;
1775 
1776 	err = nfs_init_nfspagecache();
1777 	if (err)
1778 		goto out5;
1779 
1780 	err = nfs_init_inodecache();
1781 	if (err)
1782 		goto out4;
1783 
1784 	err = nfs_init_readpagecache();
1785 	if (err)
1786 		goto out3;
1787 
1788 	err = nfs_init_writepagecache();
1789 	if (err)
1790 		goto out2;
1791 
1792 	err = nfs_init_directcache();
1793 	if (err)
1794 		goto out1;
1795 
1796 #ifdef CONFIG_PROC_FS
1797 	rpc_proc_register(&init_net, &nfs_rpcstat);
1798 #endif
1799 	if ((err = register_nfs_fs()) != 0)
1800 		goto out0;
1801 
1802 	return 0;
1803 out0:
1804 #ifdef CONFIG_PROC_FS
1805 	rpc_proc_unregister(&init_net, "nfs");
1806 #endif
1807 	nfs_destroy_directcache();
1808 out1:
1809 	nfs_destroy_writepagecache();
1810 out2:
1811 	nfs_destroy_readpagecache();
1812 out3:
1813 	nfs_destroy_inodecache();
1814 out4:
1815 	nfs_destroy_nfspagecache();
1816 out5:
1817 	nfs_fs_proc_exit();
1818 out6:
1819 	nfsiod_stop();
1820 out7:
1821 	nfs_fscache_unregister();
1822 out8:
1823 	unregister_pernet_subsys(&nfs_net_ops);
1824 out9:
1825 	return err;
1826 }
1827 
1828 static void __exit exit_nfs_fs(void)
1829 {
1830 	nfs_destroy_directcache();
1831 	nfs_destroy_writepagecache();
1832 	nfs_destroy_readpagecache();
1833 	nfs_destroy_inodecache();
1834 	nfs_destroy_nfspagecache();
1835 	nfs_fscache_unregister();
1836 	unregister_pernet_subsys(&nfs_net_ops);
1837 #ifdef CONFIG_PROC_FS
1838 	rpc_proc_unregister(&init_net, "nfs");
1839 #endif
1840 	unregister_nfs_fs();
1841 	nfs_fs_proc_exit();
1842 	nfsiod_stop();
1843 }
1844 
1845 /* Not quite true; I just maintain it */
1846 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1847 MODULE_LICENSE("GPL");
1848 module_param(enable_ino64, bool, 0644);
1849 
1850 module_init(init_nfs_fs)
1851 module_exit(exit_nfs_fs)
1852