Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/fs/nfs/inode.c

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

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