Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18

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

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