Version:  2.0.40 2.2.26 2.4.37 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 3.19

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 EXPORT_SYMBOL_GPL(nfs_zap_caches);
196 
197 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
198 {
199         if (mapping->nrpages != 0) {
200                 spin_lock(&inode->i_lock);
201                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
202                 spin_unlock(&inode->i_lock);
203         }
204 }
205 
206 void nfs_zap_acl_cache(struct inode *inode)
207 {
208         void (*clear_acl_cache)(struct inode *);
209 
210         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
211         if (clear_acl_cache != NULL)
212                 clear_acl_cache(inode);
213         spin_lock(&inode->i_lock);
214         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
215         spin_unlock(&inode->i_lock);
216 }
217 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
218 
219 void nfs_invalidate_atime(struct inode *inode)
220 {
221         spin_lock(&inode->i_lock);
222         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
223         spin_unlock(&inode->i_lock);
224 }
225 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
226 
227 /*
228  * Invalidate, but do not unhash, the inode.
229  * NB: must be called with inode->i_lock held!
230  */
231 static void nfs_invalidate_inode(struct inode *inode)
232 {
233         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
234         nfs_zap_caches_locked(inode);
235 }
236 
237 struct nfs_find_desc {
238         struct nfs_fh           *fh;
239         struct nfs_fattr        *fattr;
240 };
241 
242 /*
243  * In NFSv3 we can have 64bit inode numbers. In order to support
244  * this, and re-exported directories (also seen in NFSv2)
245  * we are forced to allow 2 different inodes to have the same
246  * i_ino.
247  */
248 static int
249 nfs_find_actor(struct inode *inode, void *opaque)
250 {
251         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
252         struct nfs_fh           *fh = desc->fh;
253         struct nfs_fattr        *fattr = desc->fattr;
254 
255         if (NFS_FILEID(inode) != fattr->fileid)
256                 return 0;
257         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
258                 return 0;
259         if (nfs_compare_fh(NFS_FH(inode), fh))
260                 return 0;
261         if (is_bad_inode(inode) || NFS_STALE(inode))
262                 return 0;
263         return 1;
264 }
265 
266 static int
267 nfs_init_locked(struct inode *inode, void *opaque)
268 {
269         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
270         struct nfs_fattr        *fattr = desc->fattr;
271 
272         set_nfs_fileid(inode, fattr->fileid);
273         nfs_copy_fh(NFS_FH(inode), desc->fh);
274         return 0;
275 }
276 
277 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
278 static void nfs_clear_label_invalid(struct inode *inode)
279 {
280         spin_lock(&inode->i_lock);
281         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
282         spin_unlock(&inode->i_lock);
283 }
284 
285 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
286                                         struct nfs4_label *label)
287 {
288         int error;
289 
290         if (label == NULL)
291                 return;
292 
293         if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
294                 error = security_inode_notifysecctx(inode, label->label,
295                                 label->len);
296                 if (error)
297                         printk(KERN_ERR "%s() %s %d "
298                                         "security_inode_notifysecctx() %d\n",
299                                         __func__,
300                                         (char *)label->label,
301                                         label->len, error);
302                 nfs_clear_label_invalid(inode);
303         }
304 }
305 
306 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
307 {
308         struct nfs4_label *label = NULL;
309         int minor_version = server->nfs_client->cl_minorversion;
310 
311         if (minor_version < 2)
312                 return label;
313 
314         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
315                 return label;
316 
317         label = kzalloc(sizeof(struct nfs4_label), flags);
318         if (label == NULL)
319                 return ERR_PTR(-ENOMEM);
320 
321         label->label = kzalloc(NFS4_MAXLABELLEN, flags);
322         if (label->label == NULL) {
323                 kfree(label);
324                 return ERR_PTR(-ENOMEM);
325         }
326         label->len = NFS4_MAXLABELLEN;
327 
328         return label;
329 }
330 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
331 #else
332 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
333                                         struct nfs4_label *label)
334 {
335 }
336 #endif
337 EXPORT_SYMBOL_GPL(nfs_setsecurity);
338 
339 /*
340  * This is our front-end to iget that looks up inodes by file handle
341  * instead of inode number.
342  */
343 struct inode *
344 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
345 {
346         struct nfs_find_desc desc = {
347                 .fh     = fh,
348                 .fattr  = fattr
349         };
350         struct inode *inode = ERR_PTR(-ENOENT);
351         unsigned long hash;
352 
353         nfs_attr_check_mountpoint(sb, fattr);
354 
355         if (nfs_attr_use_mounted_on_fileid(fattr))
356                 fattr->fileid = fattr->mounted_on_fileid;
357         else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
358                 goto out_no_inode;
359         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
360                 goto out_no_inode;
361 
362         hash = nfs_fattr_to_ino_t(fattr);
363 
364         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
365         if (inode == NULL) {
366                 inode = ERR_PTR(-ENOMEM);
367                 goto out_no_inode;
368         }
369 
370         if (inode->i_state & I_NEW) {
371                 struct nfs_inode *nfsi = NFS_I(inode);
372                 unsigned long now = jiffies;
373 
374                 /* We set i_ino for the few things that still rely on it,
375                  * such as stat(2) */
376                 inode->i_ino = hash;
377 
378                 /* We can't support update_atime(), since the server will reset it */
379                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
380                 inode->i_mode = fattr->mode;
381                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
382                                 && nfs_server_capable(inode, NFS_CAP_MODE))
383                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
384                 /* Why so? Because we want revalidate for devices/FIFOs, and
385                  * that's precisely what we have in nfs_file_inode_operations.
386                  */
387                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
388                 if (S_ISREG(inode->i_mode)) {
389                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
390                         inode->i_data.a_ops = &nfs_file_aops;
391                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
392                 } else if (S_ISDIR(inode->i_mode)) {
393                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
394                         inode->i_fop = &nfs_dir_operations;
395                         inode->i_data.a_ops = &nfs_dir_aops;
396                         /* Deal with crossing mountpoints */
397                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
398                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
399                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
400                                         inode->i_op = &nfs_referral_inode_operations;
401                                 else
402                                         inode->i_op = &nfs_mountpoint_inode_operations;
403                                 inode->i_fop = NULL;
404                                 inode->i_flags |= S_AUTOMOUNT;
405                         }
406                 } else if (S_ISLNK(inode->i_mode))
407                         inode->i_op = &nfs_symlink_inode_operations;
408                 else
409                         init_special_inode(inode, inode->i_mode, fattr->rdev);
410 
411                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
412                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
413                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
414                 inode->i_version = 0;
415                 inode->i_size = 0;
416                 clear_nlink(inode);
417                 inode->i_uid = make_kuid(&init_user_ns, -2);
418                 inode->i_gid = make_kgid(&init_user_ns, -2);
419                 inode->i_blocks = 0;
420                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
421                 nfsi->write_io = 0;
422                 nfsi->read_io = 0;
423 
424                 nfsi->read_cache_jiffies = fattr->time_start;
425                 nfsi->attr_gencount = fattr->gencount;
426                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
427                         inode->i_atime = fattr->atime;
428                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
429                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
430                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
431                         inode->i_mtime = fattr->mtime;
432                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
433                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
434                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
435                         inode->i_ctime = fattr->ctime;
436                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
437                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
438                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
439                         inode->i_version = fattr->change_attr;
440                 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
441                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
442                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
443                         inode->i_size = nfs_size_to_loff_t(fattr->size);
444                 else
445                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
446                                 | NFS_INO_REVAL_PAGECACHE);
447                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
448                         set_nlink(inode, fattr->nlink);
449                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
450                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
451                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
452                         inode->i_uid = fattr->uid;
453                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
454                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
455                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
456                         inode->i_gid = fattr->gid;
457                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
458                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
459                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
460                         inode->i_blocks = fattr->du.nfs2.blocks;
461                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
462                         /*
463                          * report the blocks in 512byte units
464                          */
465                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
466                 }
467 
468                 nfs_setsecurity(inode, fattr, label);
469 
470                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
471                 nfsi->attrtimeo_timestamp = now;
472                 nfsi->access_cache = RB_ROOT;
473 
474                 nfs_fscache_init_inode(inode);
475 
476                 unlock_new_inode(inode);
477         } else
478                 nfs_refresh_inode(inode, fattr);
479         dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
480                 inode->i_sb->s_id,
481                 (unsigned long long)NFS_FILEID(inode),
482                 nfs_display_fhandle_hash(fh),
483                 atomic_read(&inode->i_count));
484 
485 out:
486         return inode;
487 
488 out_no_inode:
489         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
490         goto out;
491 }
492 EXPORT_SYMBOL_GPL(nfs_fhget);
493 
494 #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)
495 
496 int
497 nfs_setattr(struct dentry *dentry, struct iattr *attr)
498 {
499         struct inode *inode = dentry->d_inode;
500         struct nfs_fattr *fattr;
501         int error = -ENOMEM;
502 
503         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
504 
505         /* skip mode change if it's just for clearing setuid/setgid */
506         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
507                 attr->ia_valid &= ~ATTR_MODE;
508 
509         if (attr->ia_valid & ATTR_SIZE) {
510                 BUG_ON(!S_ISREG(inode->i_mode));
511 
512                 if (attr->ia_size == i_size_read(inode))
513                         attr->ia_valid &= ~ATTR_SIZE;
514         }
515 
516         /* Optimization: if the end result is no change, don't RPC */
517         attr->ia_valid &= NFS_VALID_ATTRS;
518         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
519                 return 0;
520 
521         trace_nfs_setattr_enter(inode);
522 
523         /* Write all dirty data */
524         if (S_ISREG(inode->i_mode)) {
525                 nfs_inode_dio_wait(inode);
526                 nfs_wb_all(inode);
527         }
528 
529         fattr = nfs_alloc_fattr();
530         if (fattr == NULL)
531                 goto out;
532         /*
533          * Return any delegations if we're going to change ACLs
534          */
535         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
536                 NFS_PROTO(inode)->return_delegation(inode);
537         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
538         if (error == 0)
539                 error = nfs_refresh_inode(inode, fattr);
540         nfs_free_fattr(fattr);
541 out:
542         trace_nfs_setattr_exit(inode, error);
543         return error;
544 }
545 EXPORT_SYMBOL_GPL(nfs_setattr);
546 
547 /**
548  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
549  * @inode: inode of the file used
550  * @offset: file offset to start truncating
551  *
552  * This is a copy of the common vmtruncate, but with the locking
553  * corrected to take into account the fact that NFS requires
554  * inode->i_size to be updated under the inode->i_lock.
555  */
556 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
557 {
558         int err;
559 
560         err = inode_newsize_ok(inode, offset);
561         if (err)
562                 goto out;
563 
564         spin_lock(&inode->i_lock);
565         i_size_write(inode, offset);
566         /* Optimisation */
567         if (offset == 0)
568                 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
569         spin_unlock(&inode->i_lock);
570 
571         truncate_pagecache(inode, offset);
572 out:
573         return err;
574 }
575 
576 /**
577  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
578  * @inode: pointer to struct inode
579  * @attr: pointer to struct iattr
580  *
581  * Note: we do this in the *proc.c in order to ensure that
582  *       it works for things like exclusive creates too.
583  */
584 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
585 {
586         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
587                 spin_lock(&inode->i_lock);
588                 if ((attr->ia_valid & ATTR_MODE) != 0) {
589                         int mode = attr->ia_mode & S_IALLUGO;
590                         mode |= inode->i_mode & ~S_IALLUGO;
591                         inode->i_mode = mode;
592                 }
593                 if ((attr->ia_valid & ATTR_UID) != 0)
594                         inode->i_uid = attr->ia_uid;
595                 if ((attr->ia_valid & ATTR_GID) != 0)
596                         inode->i_gid = attr->ia_gid;
597                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
598                                 | NFS_INO_INVALID_ACL);
599                 spin_unlock(&inode->i_lock);
600         }
601         if ((attr->ia_valid & ATTR_SIZE) != 0) {
602                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
603                 nfs_vmtruncate(inode, attr->ia_size);
604         }
605 }
606 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
607 
608 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
609 {
610         struct dentry *parent;
611 
612         parent = dget_parent(dentry);
613         nfs_force_use_readdirplus(parent->d_inode);
614         dput(parent);
615 }
616 
617 static bool nfs_need_revalidate_inode(struct inode *inode)
618 {
619         if (NFS_I(inode)->cache_validity &
620                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
621                 return true;
622         if (nfs_attribute_cache_expired(inode))
623                 return true;
624         return false;
625 }
626 
627 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
628 {
629         struct inode *inode = dentry->d_inode;
630         int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
631         int err = 0;
632 
633         trace_nfs_getattr_enter(inode);
634         /* Flush out writes to the server in order to update c/mtime.  */
635         if (S_ISREG(inode->i_mode)) {
636                 nfs_inode_dio_wait(inode);
637                 err = filemap_write_and_wait(inode->i_mapping);
638                 if (err)
639                         goto out;
640         }
641 
642         /*
643          * We may force a getattr if the user cares about atime.
644          *
645          * Note that we only have to check the vfsmount flags here:
646          *  - NFS always sets S_NOATIME by so checking it would give a
647          *    bogus result
648          *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
649          *    no point in checking those.
650          */
651         if ((mnt->mnt_flags & MNT_NOATIME) ||
652             ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
653                 need_atime = 0;
654 
655         if (need_atime || nfs_need_revalidate_inode(inode)) {
656                 struct nfs_server *server = NFS_SERVER(inode);
657 
658                 if (server->caps & NFS_CAP_READDIRPLUS)
659                         nfs_request_parent_use_readdirplus(dentry);
660                 err = __nfs_revalidate_inode(server, inode);
661         }
662         if (!err) {
663                 generic_fillattr(inode, stat);
664                 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
665         }
666 out:
667         trace_nfs_getattr_exit(inode, err);
668         return err;
669 }
670 EXPORT_SYMBOL_GPL(nfs_getattr);
671 
672 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
673 {
674         atomic_set(&l_ctx->count, 1);
675         l_ctx->lockowner.l_owner = current->files;
676         l_ctx->lockowner.l_pid = current->tgid;
677         INIT_LIST_HEAD(&l_ctx->list);
678         nfs_iocounter_init(&l_ctx->io_count);
679 }
680 
681 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
682 {
683         struct nfs_lock_context *head = &ctx->lock_context;
684         struct nfs_lock_context *pos = head;
685 
686         do {
687                 if (pos->lockowner.l_owner != current->files)
688                         continue;
689                 if (pos->lockowner.l_pid != current->tgid)
690                         continue;
691                 atomic_inc(&pos->count);
692                 return pos;
693         } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
694         return NULL;
695 }
696 
697 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
698 {
699         struct nfs_lock_context *res, *new = NULL;
700         struct inode *inode = ctx->dentry->d_inode;
701 
702         spin_lock(&inode->i_lock);
703         res = __nfs_find_lock_context(ctx);
704         if (res == NULL) {
705                 spin_unlock(&inode->i_lock);
706                 new = kmalloc(sizeof(*new), GFP_KERNEL);
707                 if (new == NULL)
708                         return ERR_PTR(-ENOMEM);
709                 nfs_init_lock_context(new);
710                 spin_lock(&inode->i_lock);
711                 res = __nfs_find_lock_context(ctx);
712                 if (res == NULL) {
713                         list_add_tail(&new->list, &ctx->lock_context.list);
714                         new->open_context = ctx;
715                         res = new;
716                         new = NULL;
717                 }
718         }
719         spin_unlock(&inode->i_lock);
720         kfree(new);
721         return res;
722 }
723 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
724 
725 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
726 {
727         struct nfs_open_context *ctx = l_ctx->open_context;
728         struct inode *inode = ctx->dentry->d_inode;
729 
730         if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
731                 return;
732         list_del(&l_ctx->list);
733         spin_unlock(&inode->i_lock);
734         kfree(l_ctx);
735 }
736 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
737 
738 /**
739  * nfs_close_context - Common close_context() routine NFSv2/v3
740  * @ctx: pointer to context
741  * @is_sync: is this a synchronous close
742  *
743  * always ensure that the attributes are up to date if we're mounted
744  * with close-to-open semantics
745  */
746 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
747 {
748         struct inode *inode;
749         struct nfs_server *server;
750 
751         if (!(ctx->mode & FMODE_WRITE))
752                 return;
753         if (!is_sync)
754                 return;
755         inode = ctx->dentry->d_inode;
756         if (!list_empty(&NFS_I(inode)->open_files))
757                 return;
758         server = NFS_SERVER(inode);
759         if (server->flags & NFS_MOUNT_NOCTO)
760                 return;
761         nfs_revalidate_inode(server, inode);
762 }
763 EXPORT_SYMBOL_GPL(nfs_close_context);
764 
765 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
766 {
767         struct nfs_open_context *ctx;
768         struct rpc_cred *cred = rpc_lookup_cred();
769         if (IS_ERR(cred))
770                 return ERR_CAST(cred);
771 
772         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
773         if (!ctx) {
774                 put_rpccred(cred);
775                 return ERR_PTR(-ENOMEM);
776         }
777         nfs_sb_active(dentry->d_sb);
778         ctx->dentry = dget(dentry);
779         ctx->cred = cred;
780         ctx->state = NULL;
781         ctx->mode = f_mode;
782         ctx->flags = 0;
783         ctx->error = 0;
784         nfs_init_lock_context(&ctx->lock_context);
785         ctx->lock_context.open_context = ctx;
786         INIT_LIST_HEAD(&ctx->list);
787         ctx->mdsthreshold = NULL;
788         return ctx;
789 }
790 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
791 
792 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
793 {
794         if (ctx != NULL)
795                 atomic_inc(&ctx->lock_context.count);
796         return ctx;
797 }
798 EXPORT_SYMBOL_GPL(get_nfs_open_context);
799 
800 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
801 {
802         struct inode *inode = ctx->dentry->d_inode;
803         struct super_block *sb = ctx->dentry->d_sb;
804 
805         if (!list_empty(&ctx->list)) {
806                 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
807                         return;
808                 list_del(&ctx->list);
809                 spin_unlock(&inode->i_lock);
810         } else if (!atomic_dec_and_test(&ctx->lock_context.count))
811                 return;
812         if (inode != NULL)
813                 NFS_PROTO(inode)->close_context(ctx, is_sync);
814         if (ctx->cred != NULL)
815                 put_rpccred(ctx->cred);
816         dput(ctx->dentry);
817         nfs_sb_deactive(sb);
818         kfree(ctx->mdsthreshold);
819         kfree(ctx);
820 }
821 
822 void put_nfs_open_context(struct nfs_open_context *ctx)
823 {
824         __put_nfs_open_context(ctx, 0);
825 }
826 EXPORT_SYMBOL_GPL(put_nfs_open_context);
827 
828 /*
829  * Ensure that mmap has a recent RPC credential for use when writing out
830  * shared pages
831  */
832 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
833 {
834         struct inode *inode = ctx->dentry->d_inode;
835         struct nfs_inode *nfsi = NFS_I(inode);
836 
837         spin_lock(&inode->i_lock);
838         list_add(&ctx->list, &nfsi->open_files);
839         spin_unlock(&inode->i_lock);
840 }
841 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
842 
843 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
844 {
845         filp->private_data = get_nfs_open_context(ctx);
846         if (list_empty(&ctx->list))
847                 nfs_inode_attach_open_context(ctx);
848 }
849 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
850 
851 /*
852  * Given an inode, search for an open context with the desired characteristics
853  */
854 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
855 {
856         struct nfs_inode *nfsi = NFS_I(inode);
857         struct nfs_open_context *pos, *ctx = NULL;
858 
859         spin_lock(&inode->i_lock);
860         list_for_each_entry(pos, &nfsi->open_files, list) {
861                 if (cred != NULL && pos->cred != cred)
862                         continue;
863                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
864                         continue;
865                 ctx = get_nfs_open_context(pos);
866                 break;
867         }
868         spin_unlock(&inode->i_lock);
869         return ctx;
870 }
871 
872 static void nfs_file_clear_open_context(struct file *filp)
873 {
874         struct nfs_open_context *ctx = nfs_file_open_context(filp);
875 
876         if (ctx) {
877                 struct inode *inode = ctx->dentry->d_inode;
878 
879                 filp->private_data = NULL;
880                 spin_lock(&inode->i_lock);
881                 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
882                 spin_unlock(&inode->i_lock);
883                 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
884         }
885 }
886 
887 /*
888  * These allocate and release file read/write context information.
889  */
890 int nfs_open(struct inode *inode, struct file *filp)
891 {
892         struct nfs_open_context *ctx;
893 
894         ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
895         if (IS_ERR(ctx))
896                 return PTR_ERR(ctx);
897         nfs_file_set_open_context(filp, ctx);
898         put_nfs_open_context(ctx);
899         nfs_fscache_open_file(inode, filp);
900         return 0;
901 }
902 
903 int nfs_release(struct inode *inode, struct file *filp)
904 {
905         nfs_file_clear_open_context(filp);
906         return 0;
907 }
908 
909 /*
910  * This function is called whenever some part of NFS notices that
911  * the cached attributes have to be refreshed.
912  */
913 int
914 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
915 {
916         int              status = -ESTALE;
917         struct nfs4_label *label = NULL;
918         struct nfs_fattr *fattr = NULL;
919         struct nfs_inode *nfsi = NFS_I(inode);
920 
921         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
922                 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
923 
924         trace_nfs_revalidate_inode_enter(inode);
925 
926         if (is_bad_inode(inode))
927                 goto out;
928         if (NFS_STALE(inode))
929                 goto out;
930 
931         status = -ENOMEM;
932         fattr = nfs_alloc_fattr();
933         if (fattr == NULL)
934                 goto out;
935 
936         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
937 
938         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
939         if (IS_ERR(label)) {
940                 status = PTR_ERR(label);
941                 goto out;
942         }
943 
944         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
945         if (status != 0) {
946                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
947                          inode->i_sb->s_id,
948                          (unsigned long long)NFS_FILEID(inode), status);
949                 if (status == -ESTALE) {
950                         nfs_zap_caches(inode);
951                         if (!S_ISDIR(inode->i_mode))
952                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
953                 }
954                 goto err_out;
955         }
956 
957         status = nfs_refresh_inode(inode, fattr);
958         if (status) {
959                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
960                          inode->i_sb->s_id,
961                          (unsigned long long)NFS_FILEID(inode), status);
962                 goto err_out;
963         }
964 
965         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
966                 nfs_zap_acl_cache(inode);
967 
968         nfs_setsecurity(inode, fattr, label);
969 
970         dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
971                 inode->i_sb->s_id,
972                 (unsigned long long)NFS_FILEID(inode));
973 
974 err_out:
975         nfs4_label_free(label);
976 out:
977         nfs_free_fattr(fattr);
978         trace_nfs_revalidate_inode_exit(inode, status);
979         return status;
980 }
981 
982 int nfs_attribute_timeout(struct inode *inode)
983 {
984         struct nfs_inode *nfsi = NFS_I(inode);
985 
986         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
987 }
988 
989 int nfs_attribute_cache_expired(struct inode *inode)
990 {
991         if (nfs_have_delegated_attributes(inode))
992                 return 0;
993         return nfs_attribute_timeout(inode);
994 }
995 
996 /**
997  * nfs_revalidate_inode - Revalidate the inode attributes
998  * @server - pointer to nfs_server struct
999  * @inode - pointer to inode struct
1000  *
1001  * Updates inode attribute information by retrieving the data from the server.
1002  */
1003 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1004 {
1005         if (!nfs_need_revalidate_inode(inode))
1006                 return NFS_STALE(inode) ? -ESTALE : 0;
1007         return __nfs_revalidate_inode(server, inode);
1008 }
1009 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1010 
1011 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode)
1012 {
1013         if (!(NFS_I(inode)->cache_validity &
1014                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
1015                         && !nfs_attribute_cache_expired(inode))
1016                 return NFS_STALE(inode) ? -ESTALE : 0;
1017         return -ECHILD;
1018 }
1019 
1020 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1021 {
1022         struct nfs_inode *nfsi = NFS_I(inode);
1023         int ret;
1024 
1025         if (mapping->nrpages != 0) {
1026                 if (S_ISREG(inode->i_mode)) {
1027                         ret = nfs_sync_mapping(mapping);
1028                         if (ret < 0)
1029                                 return ret;
1030                 }
1031                 ret = invalidate_inode_pages2(mapping);
1032                 if (ret < 0)
1033                         return ret;
1034         }
1035         if (S_ISDIR(inode->i_mode)) {
1036                 spin_lock(&inode->i_lock);
1037                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1038                 spin_unlock(&inode->i_lock);
1039         }
1040         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1041         nfs_fscache_wait_on_invalidate(inode);
1042 
1043         dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1044                         inode->i_sb->s_id,
1045                         (unsigned long long)NFS_FILEID(inode));
1046         return 0;
1047 }
1048 
1049 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1050 {
1051         if (nfs_have_delegated_attributes(inode))
1052                 return false;
1053         return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1054                 || nfs_attribute_timeout(inode)
1055                 || NFS_STALE(inode);
1056 }
1057 
1058 /**
1059  * nfs_revalidate_mapping - Revalidate the pagecache
1060  * @inode - pointer to host inode
1061  * @mapping - pointer to mapping
1062  */
1063 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1064 {
1065         struct nfs_inode *nfsi = NFS_I(inode);
1066         unsigned long *bitlock = &nfsi->flags;
1067         int ret = 0;
1068 
1069         /* swapfiles are not supposed to be shared. */
1070         if (IS_SWAPFILE(inode))
1071                 goto out;
1072 
1073         if (nfs_mapping_need_revalidate_inode(inode)) {
1074                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1075                 if (ret < 0)
1076                         goto out;
1077         }
1078 
1079         /*
1080          * We must clear NFS_INO_INVALID_DATA first to ensure that
1081          * invalidations that come in while we're shooting down the mappings
1082          * are respected. But, that leaves a race window where one revalidator
1083          * can clear the flag, and then another checks it before the mapping
1084          * gets invalidated. Fix that by serializing access to this part of
1085          * the function.
1086          *
1087          * At the same time, we need to allow other tasks to see whether we
1088          * might be in the middle of invalidating the pages, so we only set
1089          * the bit lock here if it looks like we're going to be doing that.
1090          */
1091         for (;;) {
1092                 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1093                                          nfs_wait_bit_killable, TASK_KILLABLE);
1094                 if (ret)
1095                         goto out;
1096                 spin_lock(&inode->i_lock);
1097                 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1098                         spin_unlock(&inode->i_lock);
1099                         continue;
1100                 }
1101                 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1102                         break;
1103                 spin_unlock(&inode->i_lock);
1104                 goto out;
1105         }
1106 
1107         set_bit(NFS_INO_INVALIDATING, bitlock);
1108         smp_wmb();
1109         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1110         spin_unlock(&inode->i_lock);
1111         trace_nfs_invalidate_mapping_enter(inode);
1112         ret = nfs_invalidate_mapping(inode, mapping);
1113         trace_nfs_invalidate_mapping_exit(inode, ret);
1114 
1115         clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1116         smp_mb__after_atomic();
1117         wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1118 out:
1119         return ret;
1120 }
1121 
1122 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1123 {
1124         struct nfs_inode *nfsi = NFS_I(inode);
1125         unsigned long ret = 0;
1126 
1127         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1128                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1129                         && inode->i_version == fattr->pre_change_attr) {
1130                 inode->i_version = fattr->change_attr;
1131                 if (S_ISDIR(inode->i_mode))
1132                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1133                 ret |= NFS_INO_INVALID_ATTR;
1134         }
1135         /* If we have atomic WCC data, we may update some attributes */
1136         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1137                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1138                         && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1139                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1140                 ret |= NFS_INO_INVALID_ATTR;
1141         }
1142 
1143         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1144                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1145                         && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1146                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1147                 if (S_ISDIR(inode->i_mode))
1148                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1149                 ret |= NFS_INO_INVALID_ATTR;
1150         }
1151         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1152                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1153                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1154                         && nfsi->nrequests == 0) {
1155                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1156                 ret |= NFS_INO_INVALID_ATTR;
1157         }
1158 
1159         return ret;
1160 }
1161 
1162 /**
1163  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1164  * @inode - pointer to inode
1165  * @fattr - updated attributes
1166  *
1167  * Verifies the attribute cache. If we have just changed the attributes,
1168  * so that fattr carries weak cache consistency data, then it may
1169  * also update the ctime/mtime/change_attribute.
1170  */
1171 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1172 {
1173         struct nfs_inode *nfsi = NFS_I(inode);
1174         loff_t cur_size, new_isize;
1175         unsigned long invalid = 0;
1176 
1177 
1178         if (nfs_have_delegated_attributes(inode))
1179                 return 0;
1180         /* Has the inode gone and changed behind our back? */
1181         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1182                 return -EIO;
1183         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1184                 return -EIO;
1185 
1186         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1187                         inode->i_version != fattr->change_attr)
1188                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1189 
1190         /* Verify a few of the more important attributes */
1191         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1192                 invalid |= NFS_INO_INVALID_ATTR;
1193 
1194         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1195                 cur_size = i_size_read(inode);
1196                 new_isize = nfs_size_to_loff_t(fattr->size);
1197                 if (cur_size != new_isize && nfsi->nrequests == 0)
1198                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1199         }
1200 
1201         /* Have any file permissions changed? */
1202         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1203                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1204         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1205                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1206         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1207                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1208 
1209         /* Has the link count changed? */
1210         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1211                 invalid |= NFS_INO_INVALID_ATTR;
1212 
1213         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1214                 invalid |= NFS_INO_INVALID_ATIME;
1215 
1216         if (invalid != 0)
1217                 nfs_set_cache_invalid(inode, invalid);
1218 
1219         nfsi->read_cache_jiffies = fattr->time_start;
1220         return 0;
1221 }
1222 
1223 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1224 {
1225         if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1226                 return 0;
1227         return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1228 }
1229 
1230 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1231 {
1232         if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1233                 return 0;
1234         return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1235 }
1236 
1237 static atomic_long_t nfs_attr_generation_counter;
1238 
1239 static unsigned long nfs_read_attr_generation_counter(void)
1240 {
1241         return atomic_long_read(&nfs_attr_generation_counter);
1242 }
1243 
1244 unsigned long nfs_inc_attr_generation_counter(void)
1245 {
1246         return atomic_long_inc_return(&nfs_attr_generation_counter);
1247 }
1248 
1249 void nfs_fattr_init(struct nfs_fattr *fattr)
1250 {
1251         fattr->valid = 0;
1252         fattr->time_start = jiffies;
1253         fattr->gencount = nfs_inc_attr_generation_counter();
1254         fattr->owner_name = NULL;
1255         fattr->group_name = NULL;
1256 }
1257 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1258 
1259 struct nfs_fattr *nfs_alloc_fattr(void)
1260 {
1261         struct nfs_fattr *fattr;
1262 
1263         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1264         if (fattr != NULL)
1265                 nfs_fattr_init(fattr);
1266         return fattr;
1267 }
1268 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1269 
1270 struct nfs_fh *nfs_alloc_fhandle(void)
1271 {
1272         struct nfs_fh *fh;
1273 
1274         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1275         if (fh != NULL)
1276                 fh->size = 0;
1277         return fh;
1278 }
1279 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1280 
1281 #ifdef NFS_DEBUG
1282 /*
1283  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1284  *                             in the same way that wireshark does
1285  *
1286  * @fh: file handle
1287  *
1288  * For debugging only.
1289  */
1290 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1291 {
1292         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1293          * not on the result */
1294         return nfs_fhandle_hash(fh);
1295 }
1296 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1297 
1298 /*
1299  * _nfs_display_fhandle - display an NFS file handle on the console
1300  *
1301  * @fh: file handle to display
1302  * @caption: display caption
1303  *
1304  * For debugging only.
1305  */
1306 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1307 {
1308         unsigned short i;
1309 
1310         if (fh == NULL || fh->size == 0) {
1311                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1312                 return;
1313         }
1314 
1315         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1316                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1317         for (i = 0; i < fh->size; i += 16) {
1318                 __be32 *pos = (__be32 *)&fh->data[i];
1319 
1320                 switch ((fh->size - i - 1) >> 2) {
1321                 case 0:
1322                         printk(KERN_DEFAULT " %08x\n",
1323                                 be32_to_cpup(pos));
1324                         break;
1325                 case 1:
1326                         printk(KERN_DEFAULT " %08x %08x\n",
1327                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1328                         break;
1329                 case 2:
1330                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1331                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1332                                 be32_to_cpup(pos + 2));
1333                         break;
1334                 default:
1335                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1336                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1337                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1338                 }
1339         }
1340 }
1341 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1342 #endif
1343 
1344 /**
1345  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1346  * @inode - pointer to inode
1347  * @fattr - attributes
1348  *
1349  * Attempt to divine whether or not an RPC call reply carrying stale
1350  * attributes got scheduled after another call carrying updated ones.
1351  *
1352  * To do so, the function first assumes that a more recent ctime means
1353  * that the attributes in fattr are newer, however it also attempt to
1354  * catch the case where ctime either didn't change, or went backwards
1355  * (if someone reset the clock on the server) by looking at whether
1356  * or not this RPC call was started after the inode was last updated.
1357  * Note also the check for wraparound of 'attr_gencount'
1358  *
1359  * The function returns 'true' if it thinks the attributes in 'fattr' are
1360  * more recent than the ones cached in the inode.
1361  *
1362  */
1363 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1364 {
1365         const struct nfs_inode *nfsi = NFS_I(inode);
1366 
1367         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1368                 nfs_ctime_need_update(inode, fattr) ||
1369                 nfs_size_need_update(inode, fattr) ||
1370                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1371 }
1372 
1373 /*
1374  * Don't trust the change_attribute, mtime, ctime or size if
1375  * a pnfs LAYOUTCOMMIT is outstanding
1376  */
1377 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1378                 struct nfs_fattr *fattr)
1379 {
1380         if (pnfs_layoutcommit_outstanding(inode))
1381                 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1382                                 NFS_ATTR_FATTR_MTIME |
1383                                 NFS_ATTR_FATTR_CTIME |
1384                                 NFS_ATTR_FATTR_SIZE);
1385 }
1386 
1387 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1388 {
1389         int ret;
1390 
1391         trace_nfs_refresh_inode_enter(inode);
1392 
1393         nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1394 
1395         if (nfs_inode_attrs_need_update(inode, fattr))
1396                 ret = nfs_update_inode(inode, fattr);
1397         else
1398                 ret = nfs_check_inode_attributes(inode, fattr);
1399 
1400         trace_nfs_refresh_inode_exit(inode, ret);
1401         return ret;
1402 }
1403 
1404 /**
1405  * nfs_refresh_inode - try to update the inode attribute cache
1406  * @inode - pointer to inode
1407  * @fattr - updated attributes
1408  *
1409  * Check that an RPC call that returned attributes has not overlapped with
1410  * other recent updates of the inode metadata, then decide whether it is
1411  * safe to do a full update of the inode attributes, or whether just to
1412  * call nfs_check_inode_attributes.
1413  */
1414 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1415 {
1416         int status;
1417 
1418         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1419                 return 0;
1420         spin_lock(&inode->i_lock);
1421         status = nfs_refresh_inode_locked(inode, fattr);
1422         spin_unlock(&inode->i_lock);
1423 
1424         return status;
1425 }
1426 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1427 
1428 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1429 {
1430         unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1431 
1432         if (S_ISDIR(inode->i_mode))
1433                 invalid |= NFS_INO_INVALID_DATA;
1434         nfs_set_cache_invalid(inode, invalid);
1435         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1436                 return 0;
1437         return nfs_refresh_inode_locked(inode, fattr);
1438 }
1439 
1440 /**
1441  * nfs_post_op_update_inode - try to update the inode attribute cache
1442  * @inode - pointer to inode
1443  * @fattr - updated attributes
1444  *
1445  * After an operation that has changed the inode metadata, mark the
1446  * attribute cache as being invalid, then try to update it.
1447  *
1448  * NB: if the server didn't return any post op attributes, this
1449  * function will force the retrieval of attributes before the next
1450  * NFS request.  Thus it should be used only for operations that
1451  * are expected to change one or more attributes, to avoid
1452  * unnecessary NFS requests and trips through nfs_update_inode().
1453  */
1454 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1455 {
1456         int status;
1457 
1458         spin_lock(&inode->i_lock);
1459         status = nfs_post_op_update_inode_locked(inode, fattr);
1460         spin_unlock(&inode->i_lock);
1461 
1462         return status;
1463 }
1464 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1465 
1466 /**
1467  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1468  * @inode - pointer to inode
1469  * @fattr - updated attributes
1470  *
1471  * After an operation that has changed the inode metadata, mark the
1472  * attribute cache as being invalid, then try to update it. Fake up
1473  * weak cache consistency data, if none exist.
1474  *
1475  * This function is mainly designed to be used by the ->write_done() functions.
1476  */
1477 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1478 {
1479         int status;
1480 
1481         spin_lock(&inode->i_lock);
1482         /* Don't do a WCC update if these attributes are already stale */
1483         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1484                         !nfs_inode_attrs_need_update(inode, fattr)) {
1485                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1486                                 | NFS_ATTR_FATTR_PRESIZE
1487                                 | NFS_ATTR_FATTR_PREMTIME
1488                                 | NFS_ATTR_FATTR_PRECTIME);
1489                 goto out_noforce;
1490         }
1491         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1492                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1493                 fattr->pre_change_attr = inode->i_version;
1494                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1495         }
1496         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1497                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1498                 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1499                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1500         }
1501         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1502                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1503                 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1504                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1505         }
1506         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1507                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1508                 fattr->pre_size = i_size_read(inode);
1509                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1510         }
1511 out_noforce:
1512         status = nfs_post_op_update_inode_locked(inode, fattr);
1513         spin_unlock(&inode->i_lock);
1514         return status;
1515 }
1516 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1517 
1518 /*
1519  * Many nfs protocol calls return the new file attributes after
1520  * an operation.  Here we update the inode to reflect the state
1521  * of the server's inode.
1522  *
1523  * This is a bit tricky because we have to make sure all dirty pages
1524  * have been sent off to the server before calling invalidate_inode_pages.
1525  * To make sure no other process adds more write requests while we try
1526  * our best to flush them, we make them sleep during the attribute refresh.
1527  *
1528  * A very similar scenario holds for the dir cache.
1529  */
1530 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1531 {
1532         struct nfs_server *server;
1533         struct nfs_inode *nfsi = NFS_I(inode);
1534         loff_t cur_isize, new_isize;
1535         unsigned long invalid = 0;
1536         unsigned long now = jiffies;
1537         unsigned long save_cache_validity;
1538 
1539         dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1540                         __func__, inode->i_sb->s_id, inode->i_ino,
1541                         nfs_display_fhandle_hash(NFS_FH(inode)),
1542                         atomic_read(&inode->i_count), fattr->valid);
1543 
1544         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1545                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1546                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1547                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1548                         inode->i_sb->s_id, (long long)nfsi->fileid,
1549                         (long long)fattr->fileid);
1550                 goto out_err;
1551         }
1552 
1553         /*
1554          * Make sure the inode's type hasn't changed.
1555          */
1556         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1557                 /*
1558                 * Big trouble! The inode has become a different object.
1559                 */
1560                 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1561                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1562                 goto out_err;
1563         }
1564 
1565         server = NFS_SERVER(inode);
1566         /* Update the fsid? */
1567         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1568                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1569                         !IS_AUTOMOUNT(inode))
1570                 server->fsid = fattr->fsid;
1571 
1572         /*
1573          * Update the read time so we don't revalidate too often.
1574          */
1575         nfsi->read_cache_jiffies = fattr->time_start;
1576 
1577         save_cache_validity = nfsi->cache_validity;
1578         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1579                         | NFS_INO_INVALID_ATIME
1580                         | NFS_INO_REVAL_FORCED
1581                         | NFS_INO_REVAL_PAGECACHE);
1582 
1583         /* Do atomic weak cache consistency updates */
1584         invalid |= nfs_wcc_update_inode(inode, fattr);
1585 
1586         /* More cache consistency checks */
1587         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1588                 if (inode->i_version != fattr->change_attr) {
1589                         dprintk("NFS: change_attr change on server for file %s/%ld\n",
1590                                         inode->i_sb->s_id, inode->i_ino);
1591                         invalid |= NFS_INO_INVALID_ATTR
1592                                 | NFS_INO_INVALID_DATA
1593                                 | NFS_INO_INVALID_ACCESS
1594                                 | NFS_INO_INVALID_ACL
1595                                 | NFS_INO_REVAL_PAGECACHE;
1596                         if (S_ISDIR(inode->i_mode))
1597                                 nfs_force_lookup_revalidate(inode);
1598                         inode->i_version = fattr->change_attr;
1599                 }
1600         } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1601                 nfsi->cache_validity |= save_cache_validity;
1602 
1603         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1604                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1605         } else if (server->caps & NFS_CAP_MTIME)
1606                 nfsi->cache_validity |= save_cache_validity &
1607                                 (NFS_INO_INVALID_ATTR
1608                                 | NFS_INO_REVAL_FORCED);
1609 
1610         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1611                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1612         } else if (server->caps & NFS_CAP_CTIME)
1613                 nfsi->cache_validity |= save_cache_validity &
1614                                 (NFS_INO_INVALID_ATTR
1615                                 | NFS_INO_REVAL_FORCED);
1616 
1617         /* Check if our cached file size is stale */
1618         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1619                 new_isize = nfs_size_to_loff_t(fattr->size);
1620                 cur_isize = i_size_read(inode);
1621                 if (new_isize != cur_isize) {
1622                         /* Do we perhaps have any outstanding writes, or has
1623                          * the file grown beyond our last write? */
1624                         if ((nfsi->nrequests == 0) || new_isize > cur_isize) {
1625                                 i_size_write(inode, new_isize);
1626                                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1627                                 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1628                         }
1629                         dprintk("NFS: isize change on server for file %s/%ld "
1630                                         "(%Ld to %Ld)\n",
1631                                         inode->i_sb->s_id,
1632                                         inode->i_ino,
1633                                         (long long)cur_isize,
1634                                         (long long)new_isize);
1635                 }
1636         } else
1637                 nfsi->cache_validity |= save_cache_validity &
1638                                 (NFS_INO_INVALID_ATTR
1639                                 | NFS_INO_REVAL_PAGECACHE
1640                                 | NFS_INO_REVAL_FORCED);
1641 
1642 
1643         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1644                 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1645         else if (server->caps & NFS_CAP_ATIME)
1646                 nfsi->cache_validity |= save_cache_validity &
1647                                 (NFS_INO_INVALID_ATIME
1648                                 | NFS_INO_REVAL_FORCED);
1649 
1650         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1651                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1652                         umode_t newmode = inode->i_mode & S_IFMT;
1653                         newmode |= fattr->mode & S_IALLUGO;
1654                         inode->i_mode = newmode;
1655                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1656                 }
1657         } else if (server->caps & NFS_CAP_MODE)
1658                 nfsi->cache_validity |= save_cache_validity &
1659                                 (NFS_INO_INVALID_ATTR
1660                                 | NFS_INO_INVALID_ACCESS
1661                                 | NFS_INO_INVALID_ACL
1662                                 | NFS_INO_REVAL_FORCED);
1663 
1664         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1665                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1666                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1667                         inode->i_uid = fattr->uid;
1668                 }
1669         } else if (server->caps & NFS_CAP_OWNER)
1670                 nfsi->cache_validity |= save_cache_validity &
1671                                 (NFS_INO_INVALID_ATTR
1672                                 | NFS_INO_INVALID_ACCESS
1673                                 | NFS_INO_INVALID_ACL
1674                                 | NFS_INO_REVAL_FORCED);
1675 
1676         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1677                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1678                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1679                         inode->i_gid = fattr->gid;
1680                 }
1681         } else if (server->caps & NFS_CAP_OWNER_GROUP)
1682                 nfsi->cache_validity |= save_cache_validity &
1683                                 (NFS_INO_INVALID_ATTR
1684                                 | NFS_INO_INVALID_ACCESS
1685                                 | NFS_INO_INVALID_ACL
1686                                 | NFS_INO_REVAL_FORCED);
1687 
1688         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1689                 if (inode->i_nlink != fattr->nlink) {
1690                         invalid |= NFS_INO_INVALID_ATTR;
1691                         if (S_ISDIR(inode->i_mode))
1692                                 invalid |= NFS_INO_INVALID_DATA;
1693                         set_nlink(inode, fattr->nlink);
1694                 }
1695         } else if (server->caps & NFS_CAP_NLINK)
1696                 nfsi->cache_validity |= save_cache_validity &
1697                                 (NFS_INO_INVALID_ATTR
1698                                 | NFS_INO_REVAL_FORCED);
1699 
1700         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1701                 /*
1702                  * report the blocks in 512byte units
1703                  */
1704                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1705         }
1706         if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1707                 inode->i_blocks = fattr->du.nfs2.blocks;
1708 
1709         /* Update attrtimeo value if we're out of the unstable period */
1710         if (invalid & NFS_INO_INVALID_ATTR) {
1711                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1712                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1713                 nfsi->attrtimeo_timestamp = now;
1714                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1715         } else {
1716                 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1717                         if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1718                                 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1719                         nfsi->attrtimeo_timestamp = now;
1720                 }
1721         }
1722         invalid &= ~NFS_INO_INVALID_ATTR;
1723         /* Don't invalidate the data if we were to blame */
1724         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1725                                 || S_ISLNK(inode->i_mode)))
1726                 invalid &= ~NFS_INO_INVALID_DATA;
1727         if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1728                         (save_cache_validity & NFS_INO_REVAL_FORCED))
1729                 nfs_set_cache_invalid(inode, invalid);
1730 
1731         return 0;
1732  out_err:
1733         /*
1734          * No need to worry about unhashing the dentry, as the
1735          * lookup validation will know that the inode is bad.
1736          * (But we fall through to invalidate the caches.)
1737          */
1738         nfs_invalidate_inode(inode);
1739         return -ESTALE;
1740 }
1741 
1742 struct inode *nfs_alloc_inode(struct super_block *sb)
1743 {
1744         struct nfs_inode *nfsi;
1745         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1746         if (!nfsi)
1747                 return NULL;
1748         nfsi->flags = 0UL;
1749         nfsi->cache_validity = 0UL;
1750 #if IS_ENABLED(CONFIG_NFS_V4)
1751         nfsi->nfs4_acl = NULL;
1752 #endif /* CONFIG_NFS_V4 */
1753         return &nfsi->vfs_inode;
1754 }
1755 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1756 
1757 static void nfs_i_callback(struct rcu_head *head)
1758 {
1759         struct inode *inode = container_of(head, struct inode, i_rcu);
1760         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1761 }
1762 
1763 void nfs_destroy_inode(struct inode *inode)
1764 {
1765         call_rcu(&inode->i_rcu, nfs_i_callback);
1766 }
1767 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1768 
1769 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1770 {
1771 #if IS_ENABLED(CONFIG_NFS_V4)
1772         INIT_LIST_HEAD(&nfsi->open_states);
1773         nfsi->delegation = NULL;
1774         nfsi->delegation_state = 0;
1775         init_rwsem(&nfsi->rwsem);
1776         nfsi->layout = NULL;
1777 #endif
1778 }
1779 
1780 static void init_once(void *foo)
1781 {
1782         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1783 
1784         inode_init_once(&nfsi->vfs_inode);
1785         INIT_LIST_HEAD(&nfsi->open_files);
1786         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1787         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1788         INIT_LIST_HEAD(&nfsi->commit_info.list);
1789         nfsi->nrequests = 0;
1790         nfsi->commit_info.ncommit = 0;
1791         atomic_set(&nfsi->commit_info.rpcs_out, 0);
1792         atomic_set(&nfsi->silly_count, 1);
1793         INIT_HLIST_HEAD(&nfsi->silly_list);
1794         init_waitqueue_head(&nfsi->waitqueue);
1795         nfs4_init_once(nfsi);
1796 }
1797 
1798 static int __init nfs_init_inodecache(void)
1799 {
1800         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1801                                              sizeof(struct nfs_inode),
1802                                              0, (SLAB_RECLAIM_ACCOUNT|
1803                                                 SLAB_MEM_SPREAD),
1804                                              init_once);
1805         if (nfs_inode_cachep == NULL)
1806                 return -ENOMEM;
1807 
1808         return 0;
1809 }
1810 
1811 static void nfs_destroy_inodecache(void)
1812 {
1813         /*
1814          * Make sure all delayed rcu free inodes are flushed before we
1815          * destroy cache.
1816          */
1817         rcu_barrier();
1818         kmem_cache_destroy(nfs_inode_cachep);
1819 }
1820 
1821 struct workqueue_struct *nfsiod_workqueue;
1822 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1823 
1824 /*
1825  * start up the nfsiod workqueue
1826  */
1827 static int nfsiod_start(void)
1828 {
1829         struct workqueue_struct *wq;
1830         dprintk("RPC:       creating workqueue nfsiod\n");
1831         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1832         if (wq == NULL)
1833                 return -ENOMEM;
1834         nfsiod_workqueue = wq;
1835         return 0;
1836 }
1837 
1838 /*
1839  * Destroy the nfsiod workqueue
1840  */
1841 static void nfsiod_stop(void)
1842 {
1843         struct workqueue_struct *wq;
1844 
1845         wq = nfsiod_workqueue;
1846         if (wq == NULL)
1847                 return;
1848         nfsiod_workqueue = NULL;
1849         destroy_workqueue(wq);
1850 }
1851 
1852 int nfs_net_id;
1853 EXPORT_SYMBOL_GPL(nfs_net_id);
1854 
1855 static int nfs_net_init(struct net *net)
1856 {
1857         nfs_clients_init(net);
1858         return nfs_fs_proc_net_init(net);
1859 }
1860 
1861 static void nfs_net_exit(struct net *net)
1862 {
1863         nfs_fs_proc_net_exit(net);
1864         nfs_cleanup_cb_ident_idr(net);
1865 }
1866 
1867 static struct pernet_operations nfs_net_ops = {
1868         .init = nfs_net_init,
1869         .exit = nfs_net_exit,
1870         .id   = &nfs_net_id,
1871         .size = sizeof(struct nfs_net),
1872 };
1873 
1874 /*
1875  * Initialize NFS
1876  */
1877 static int __init init_nfs_fs(void)
1878 {
1879         int err;
1880 
1881         err = register_pernet_subsys(&nfs_net_ops);
1882         if (err < 0)
1883                 goto out9;
1884 
1885         err = nfs_fscache_register();
1886         if (err < 0)
1887                 goto out8;
1888 
1889         err = nfsiod_start();
1890         if (err)
1891                 goto out7;
1892 
1893         err = nfs_fs_proc_init();
1894         if (err)
1895                 goto out6;
1896 
1897         err = nfs_init_nfspagecache();
1898         if (err)
1899                 goto out5;
1900 
1901         err = nfs_init_inodecache();
1902         if (err)
1903                 goto out4;
1904 
1905         err = nfs_init_readpagecache();
1906         if (err)
1907                 goto out3;
1908 
1909         err = nfs_init_writepagecache();
1910         if (err)
1911                 goto out2;
1912 
1913         err = nfs_init_directcache();
1914         if (err)
1915                 goto out1;
1916 
1917 #ifdef CONFIG_PROC_FS
1918         rpc_proc_register(&init_net, &nfs_rpcstat);
1919 #endif
1920         if ((err = register_nfs_fs()) != 0)
1921                 goto out0;
1922 
1923         return 0;
1924 out0:
1925 #ifdef CONFIG_PROC_FS
1926         rpc_proc_unregister(&init_net, "nfs");
1927 #endif
1928         nfs_destroy_directcache();
1929 out1:
1930         nfs_destroy_writepagecache();
1931 out2:
1932         nfs_destroy_readpagecache();
1933 out3:
1934         nfs_destroy_inodecache();
1935 out4:
1936         nfs_destroy_nfspagecache();
1937 out5:
1938         nfs_fs_proc_exit();
1939 out6:
1940         nfsiod_stop();
1941 out7:
1942         nfs_fscache_unregister();
1943 out8:
1944         unregister_pernet_subsys(&nfs_net_ops);
1945 out9:
1946         return err;
1947 }
1948 
1949 static void __exit exit_nfs_fs(void)
1950 {
1951         nfs_destroy_directcache();
1952         nfs_destroy_writepagecache();
1953         nfs_destroy_readpagecache();
1954         nfs_destroy_inodecache();
1955         nfs_destroy_nfspagecache();
1956         nfs_fscache_unregister();
1957         unregister_pernet_subsys(&nfs_net_ops);
1958 #ifdef CONFIG_PROC_FS
1959         rpc_proc_unregister(&init_net, "nfs");
1960 #endif
1961         unregister_nfs_fs();
1962         nfs_fs_proc_exit();
1963         nfsiod_stop();
1964 }
1965 
1966 /* Not quite true; I just maintain it */
1967 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1968 MODULE_LICENSE("GPL");
1969 module_param(enable_ino64, bool, 0644);
1970 
1971 module_init(init_nfs_fs)
1972 module_exit(exit_nfs_fs)
1973 

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