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TOMOYO Linux Cross Reference
Linux/fs/nfs/inode.c

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  1 /*
  2  *  linux/fs/nfs/inode.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  *
  6  *  nfs inode and superblock handling functions
  7  *
  8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 10  *
 11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 12  *  J.S.Peatfield@damtp.cam.ac.uk
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/init.h>
 18 #include <linux/sched/signal.h>
 19 #include <linux/time.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/string.h>
 23 #include <linux/stat.h>
 24 #include <linux/errno.h>
 25 #include <linux/unistd.h>
 26 #include <linux/sunrpc/clnt.h>
 27 #include <linux/sunrpc/stats.h>
 28 #include <linux/sunrpc/metrics.h>
 29 #include <linux/nfs_fs.h>
 30 #include <linux/nfs_mount.h>
 31 #include <linux/nfs4_mount.h>
 32 #include <linux/lockd/bind.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/mount.h>
 35 #include <linux/vfs.h>
 36 #include <linux/inet.h>
 37 #include <linux/nfs_xdr.h>
 38 #include <linux/slab.h>
 39 #include <linux/compat.h>
 40 #include <linux/freezer.h>
 41 #include <linux/uaccess.h>
 42 #include <linux/iversion.h>
 43 
 44 #include "nfs4_fs.h"
 45 #include "callback.h"
 46 #include "delegation.h"
 47 #include "iostat.h"
 48 #include "internal.h"
 49 #include "fscache.h"
 50 #include "pnfs.h"
 51 #include "nfs.h"
 52 #include "netns.h"
 53 
 54 #include "nfstrace.h"
 55 
 56 #define NFSDBG_FACILITY         NFSDBG_VFS
 57 
 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
 59 
 60 /* Default is to see 64-bit inode numbers */
 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 static int nfs_wait_killable(int mode)
 75 {
 76         freezable_schedule_unsafe();
 77         if (signal_pending_state(mode, current))
 78                 return -ERESTARTSYS;
 79         return 0;
 80 }
 81 
 82 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
 83 {
 84         return nfs_wait_killable(mode);
 85 }
 86 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
 87 
 88 /**
 89  * nfs_compat_user_ino64 - returns the user-visible inode number
 90  * @fileid: 64-bit fileid
 91  *
 92  * This function returns a 32-bit inode number if the boot parameter
 93  * nfs.enable_ino64 is zero.
 94  */
 95 u64 nfs_compat_user_ino64(u64 fileid)
 96 {
 97 #ifdef CONFIG_COMPAT
 98         compat_ulong_t ino;
 99 #else   
100         unsigned long ino;
101 #endif
102 
103         if (enable_ino64)
104                 return fileid;
105         ino = fileid;
106         if (sizeof(ino) < sizeof(fileid))
107                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
108         return ino;
109 }
110 
111 int nfs_drop_inode(struct inode *inode)
112 {
113         return NFS_STALE(inode) || generic_drop_inode(inode);
114 }
115 EXPORT_SYMBOL_GPL(nfs_drop_inode);
116 
117 void nfs_clear_inode(struct inode *inode)
118 {
119         /*
120          * The following should never happen...
121          */
122         WARN_ON_ONCE(nfs_have_writebacks(inode));
123         WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
124         nfs_zap_acl_cache(inode);
125         nfs_access_zap_cache(inode);
126         nfs_fscache_clear_inode(inode);
127 }
128 EXPORT_SYMBOL_GPL(nfs_clear_inode);
129 
130 void nfs_evict_inode(struct inode *inode)
131 {
132         truncate_inode_pages_final(&inode->i_data);
133         clear_inode(inode);
134         nfs_clear_inode(inode);
135 }
136 
137 int nfs_sync_inode(struct inode *inode)
138 {
139         inode_dio_wait(inode);
140         return nfs_wb_all(inode);
141 }
142 EXPORT_SYMBOL_GPL(nfs_sync_inode);
143 
144 /**
145  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
146  */
147 int nfs_sync_mapping(struct address_space *mapping)
148 {
149         int ret = 0;
150 
151         if (mapping->nrpages != 0) {
152                 unmap_mapping_range(mapping, 0, 0, 0);
153                 ret = nfs_wb_all(mapping->host);
154         }
155         return ret;
156 }
157 
158 static int nfs_attribute_timeout(struct inode *inode)
159 {
160         struct nfs_inode *nfsi = NFS_I(inode);
161 
162         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
163 }
164 
165 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
166 {
167         unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
168 
169         /* Special case for the pagecache or access cache */
170         if (flags == NFS_INO_REVAL_PAGECACHE &&
171             !(cache_validity & NFS_INO_REVAL_FORCED))
172                 return false;
173         return (cache_validity & flags) != 0;
174 }
175 
176 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
177 {
178         unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
179 
180         if ((cache_validity & flags) != 0)
181                 return true;
182         if (nfs_attribute_timeout(inode))
183                 return true;
184         return false;
185 }
186 
187 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
188 {
189         if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
190                 return nfs_check_cache_invalid_delegated(inode, flags);
191 
192         return nfs_check_cache_invalid_not_delegated(inode, flags);
193 }
194 
195 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
196 {
197         struct nfs_inode *nfsi = NFS_I(inode);
198         bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
199 
200         if (have_delegation) {
201                 if (!(flags & NFS_INO_REVAL_FORCED))
202                         flags &= ~NFS_INO_INVALID_OTHER;
203                 flags &= ~(NFS_INO_INVALID_CHANGE
204                                 | NFS_INO_INVALID_SIZE
205                                 | NFS_INO_REVAL_PAGECACHE);
206         }
207 
208         if (inode->i_mapping->nrpages == 0)
209                 flags &= ~NFS_INO_INVALID_DATA;
210         nfsi->cache_validity |= flags;
211         if (flags & NFS_INO_INVALID_DATA)
212                 nfs_fscache_invalidate(inode);
213 }
214 
215 /*
216  * Invalidate the local caches
217  */
218 static void nfs_zap_caches_locked(struct inode *inode)
219 {
220         struct nfs_inode *nfsi = NFS_I(inode);
221         int mode = inode->i_mode;
222 
223         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
224 
225         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
226         nfsi->attrtimeo_timestamp = jiffies;
227 
228         memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
229         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
230                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
231                                         | NFS_INO_INVALID_DATA
232                                         | NFS_INO_INVALID_ACCESS
233                                         | NFS_INO_INVALID_ACL
234                                         | NFS_INO_REVAL_PAGECACHE);
235         } else
236                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
237                                         | NFS_INO_INVALID_ACCESS
238                                         | NFS_INO_INVALID_ACL
239                                         | NFS_INO_REVAL_PAGECACHE);
240         nfs_zap_label_cache_locked(nfsi);
241 }
242 
243 void nfs_zap_caches(struct inode *inode)
244 {
245         spin_lock(&inode->i_lock);
246         nfs_zap_caches_locked(inode);
247         spin_unlock(&inode->i_lock);
248 }
249 
250 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
251 {
252         if (mapping->nrpages != 0) {
253                 spin_lock(&inode->i_lock);
254                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
255                 spin_unlock(&inode->i_lock);
256         }
257 }
258 
259 void nfs_zap_acl_cache(struct inode *inode)
260 {
261         void (*clear_acl_cache)(struct inode *);
262 
263         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
264         if (clear_acl_cache != NULL)
265                 clear_acl_cache(inode);
266         spin_lock(&inode->i_lock);
267         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
268         spin_unlock(&inode->i_lock);
269 }
270 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
271 
272 void nfs_invalidate_atime(struct inode *inode)
273 {
274         spin_lock(&inode->i_lock);
275         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
276         spin_unlock(&inode->i_lock);
277 }
278 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
279 
280 /*
281  * Invalidate, but do not unhash, the inode.
282  * NB: must be called with inode->i_lock held!
283  */
284 static void nfs_invalidate_inode(struct inode *inode)
285 {
286         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
287         nfs_zap_caches_locked(inode);
288 }
289 
290 struct nfs_find_desc {
291         struct nfs_fh           *fh;
292         struct nfs_fattr        *fattr;
293 };
294 
295 /*
296  * In NFSv3 we can have 64bit inode numbers. In order to support
297  * this, and re-exported directories (also seen in NFSv2)
298  * we are forced to allow 2 different inodes to have the same
299  * i_ino.
300  */
301 static int
302 nfs_find_actor(struct inode *inode, void *opaque)
303 {
304         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
305         struct nfs_fh           *fh = desc->fh;
306         struct nfs_fattr        *fattr = desc->fattr;
307 
308         if (NFS_FILEID(inode) != fattr->fileid)
309                 return 0;
310         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
311                 return 0;
312         if (nfs_compare_fh(NFS_FH(inode), fh))
313                 return 0;
314         if (is_bad_inode(inode) || NFS_STALE(inode))
315                 return 0;
316         return 1;
317 }
318 
319 static int
320 nfs_init_locked(struct inode *inode, void *opaque)
321 {
322         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
323         struct nfs_fattr        *fattr = desc->fattr;
324 
325         set_nfs_fileid(inode, fattr->fileid);
326         inode->i_mode = fattr->mode;
327         nfs_copy_fh(NFS_FH(inode), desc->fh);
328         return 0;
329 }
330 
331 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
332 static void nfs_clear_label_invalid(struct inode *inode)
333 {
334         spin_lock(&inode->i_lock);
335         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
336         spin_unlock(&inode->i_lock);
337 }
338 
339 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
340                                         struct nfs4_label *label)
341 {
342         int error;
343 
344         if (label == NULL)
345                 return;
346 
347         if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
348                 error = security_inode_notifysecctx(inode, label->label,
349                                 label->len);
350                 if (error)
351                         printk(KERN_ERR "%s() %s %d "
352                                         "security_inode_notifysecctx() %d\n",
353                                         __func__,
354                                         (char *)label->label,
355                                         label->len, error);
356                 nfs_clear_label_invalid(inode);
357         }
358 }
359 
360 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
361 {
362         struct nfs4_label *label = NULL;
363         int minor_version = server->nfs_client->cl_minorversion;
364 
365         if (minor_version < 2)
366                 return label;
367 
368         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
369                 return label;
370 
371         label = kzalloc(sizeof(struct nfs4_label), flags);
372         if (label == NULL)
373                 return ERR_PTR(-ENOMEM);
374 
375         label->label = kzalloc(NFS4_MAXLABELLEN, flags);
376         if (label->label == NULL) {
377                 kfree(label);
378                 return ERR_PTR(-ENOMEM);
379         }
380         label->len = NFS4_MAXLABELLEN;
381 
382         return label;
383 }
384 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
385 #else
386 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
387                                         struct nfs4_label *label)
388 {
389 }
390 #endif
391 EXPORT_SYMBOL_GPL(nfs_setsecurity);
392 
393 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
394 struct inode *
395 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
396 {
397         struct nfs_find_desc desc = {
398                 .fh     = fh,
399                 .fattr  = fattr,
400         };
401         struct inode *inode;
402         unsigned long hash;
403 
404         if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
405             !(fattr->valid & NFS_ATTR_FATTR_TYPE))
406                 return NULL;
407 
408         hash = nfs_fattr_to_ino_t(fattr);
409         inode = ilookup5(sb, hash, nfs_find_actor, &desc);
410 
411         dprintk("%s: returning %p\n", __func__, inode);
412         return inode;
413 }
414 
415 /*
416  * This is our front-end to iget that looks up inodes by file handle
417  * instead of inode number.
418  */
419 struct inode *
420 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
421 {
422         struct nfs_find_desc desc = {
423                 .fh     = fh,
424                 .fattr  = fattr
425         };
426         struct inode *inode = ERR_PTR(-ENOENT);
427         unsigned long hash;
428 
429         nfs_attr_check_mountpoint(sb, fattr);
430 
431         if (nfs_attr_use_mounted_on_fileid(fattr))
432                 fattr->fileid = fattr->mounted_on_fileid;
433         else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
434                 goto out_no_inode;
435         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
436                 goto out_no_inode;
437 
438         hash = nfs_fattr_to_ino_t(fattr);
439 
440         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
441         if (inode == NULL) {
442                 inode = ERR_PTR(-ENOMEM);
443                 goto out_no_inode;
444         }
445 
446         if (inode->i_state & I_NEW) {
447                 struct nfs_inode *nfsi = NFS_I(inode);
448                 unsigned long now = jiffies;
449 
450                 /* We set i_ino for the few things that still rely on it,
451                  * such as stat(2) */
452                 inode->i_ino = hash;
453 
454                 /* We can't support update_atime(), since the server will reset it */
455                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
456                 inode->i_mode = fattr->mode;
457                 nfsi->cache_validity = 0;
458                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
459                                 && nfs_server_capable(inode, NFS_CAP_MODE))
460                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
461                 /* Why so? Because we want revalidate for devices/FIFOs, and
462                  * that's precisely what we have in nfs_file_inode_operations.
463                  */
464                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
465                 if (S_ISREG(inode->i_mode)) {
466                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
467                         inode->i_data.a_ops = &nfs_file_aops;
468                 } else if (S_ISDIR(inode->i_mode)) {
469                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
470                         inode->i_fop = &nfs_dir_operations;
471                         inode->i_data.a_ops = &nfs_dir_aops;
472                         /* Deal with crossing mountpoints */
473                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
474                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
475                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
476                                         inode->i_op = &nfs_referral_inode_operations;
477                                 else
478                                         inode->i_op = &nfs_mountpoint_inode_operations;
479                                 inode->i_fop = NULL;
480                                 inode->i_flags |= S_AUTOMOUNT;
481                         }
482                 } else if (S_ISLNK(inode->i_mode)) {
483                         inode->i_op = &nfs_symlink_inode_operations;
484                         inode_nohighmem(inode);
485                 } else
486                         init_special_inode(inode, inode->i_mode, fattr->rdev);
487 
488                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
489                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
490                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
491                 inode_set_iversion_raw(inode, 0);
492                 inode->i_size = 0;
493                 clear_nlink(inode);
494                 inode->i_uid = make_kuid(&init_user_ns, -2);
495                 inode->i_gid = make_kgid(&init_user_ns, -2);
496                 inode->i_blocks = 0;
497                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
498                 nfsi->write_io = 0;
499                 nfsi->read_io = 0;
500 
501                 nfsi->read_cache_jiffies = fattr->time_start;
502                 nfsi->attr_gencount = fattr->gencount;
503                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
504                         inode->i_atime = timespec_to_timespec64(fattr->atime);
505                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
506                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
507                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
508                         inode->i_mtime = timespec_to_timespec64(fattr->mtime);
509                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
510                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
511                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
512                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
513                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
514                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
515                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
516                         inode_set_iversion_raw(inode, fattr->change_attr);
517                 else
518                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
519                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
520                         inode->i_size = nfs_size_to_loff_t(fattr->size);
521                 else
522                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
523                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
524                         set_nlink(inode, fattr->nlink);
525                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
526                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
527                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
528                         inode->i_uid = fattr->uid;
529                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
530                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
531                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
532                         inode->i_gid = fattr->gid;
533                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
534                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
535                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
536                         inode->i_blocks = fattr->du.nfs2.blocks;
537                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
538                         /*
539                          * report the blocks in 512byte units
540                          */
541                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
542                 }
543 
544                 if (nfsi->cache_validity != 0)
545                         nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
546 
547                 nfs_setsecurity(inode, fattr, label);
548 
549                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
550                 nfsi->attrtimeo_timestamp = now;
551                 nfsi->access_cache = RB_ROOT;
552 
553                 nfs_fscache_init_inode(inode);
554 
555                 unlock_new_inode(inode);
556         } else {
557                 int err = nfs_refresh_inode(inode, fattr);
558                 if (err < 0) {
559                         iput(inode);
560                         inode = ERR_PTR(err);
561                         goto out_no_inode;
562                 }
563         }
564         dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
565                 inode->i_sb->s_id,
566                 (unsigned long long)NFS_FILEID(inode),
567                 nfs_display_fhandle_hash(fh),
568                 atomic_read(&inode->i_count));
569 
570 out:
571         return inode;
572 
573 out_no_inode:
574         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
575         goto out;
576 }
577 EXPORT_SYMBOL_GPL(nfs_fhget);
578 
579 #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)
580 
581 int
582 nfs_setattr(struct dentry *dentry, struct iattr *attr)
583 {
584         struct inode *inode = d_inode(dentry);
585         struct nfs_fattr *fattr;
586         int error = 0;
587 
588         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
589 
590         /* skip mode change if it's just for clearing setuid/setgid */
591         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
592                 attr->ia_valid &= ~ATTR_MODE;
593 
594         if (attr->ia_valid & ATTR_SIZE) {
595                 BUG_ON(!S_ISREG(inode->i_mode));
596 
597                 error = inode_newsize_ok(inode, attr->ia_size);
598                 if (error)
599                         return error;
600 
601                 if (attr->ia_size == i_size_read(inode))
602                         attr->ia_valid &= ~ATTR_SIZE;
603         }
604 
605         /* Optimization: if the end result is no change, don't RPC */
606         attr->ia_valid &= NFS_VALID_ATTRS;
607         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
608                 return 0;
609 
610         trace_nfs_setattr_enter(inode);
611 
612         /* Write all dirty data */
613         if (S_ISREG(inode->i_mode))
614                 nfs_sync_inode(inode);
615 
616         fattr = nfs_alloc_fattr();
617         if (fattr == NULL) {
618                 error = -ENOMEM;
619                 goto out;
620         }
621 
622         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
623         if (error == 0)
624                 error = nfs_refresh_inode(inode, fattr);
625         nfs_free_fattr(fattr);
626 out:
627         trace_nfs_setattr_exit(inode, error);
628         return error;
629 }
630 EXPORT_SYMBOL_GPL(nfs_setattr);
631 
632 /**
633  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
634  * @inode: inode of the file used
635  * @offset: file offset to start truncating
636  *
637  * This is a copy of the common vmtruncate, but with the locking
638  * corrected to take into account the fact that NFS requires
639  * inode->i_size to be updated under the inode->i_lock.
640  * Note: must be called with inode->i_lock held!
641  */
642 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
643 {
644         int err;
645 
646         err = inode_newsize_ok(inode, offset);
647         if (err)
648                 goto out;
649 
650         i_size_write(inode, offset);
651         /* Optimisation */
652         if (offset == 0)
653                 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
654         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
655 
656         spin_unlock(&inode->i_lock);
657         truncate_pagecache(inode, offset);
658         spin_lock(&inode->i_lock);
659 out:
660         return err;
661 }
662 
663 /**
664  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
665  * @inode: pointer to struct inode
666  * @attr: pointer to struct iattr
667  * @fattr: pointer to struct nfs_fattr
668  *
669  * Note: we do this in the *proc.c in order to ensure that
670  *       it works for things like exclusive creates too.
671  */
672 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
673                 struct nfs_fattr *fattr)
674 {
675         /* Barrier: bump the attribute generation count. */
676         nfs_fattr_set_barrier(fattr);
677 
678         spin_lock(&inode->i_lock);
679         NFS_I(inode)->attr_gencount = fattr->gencount;
680         if ((attr->ia_valid & ATTR_SIZE) != 0) {
681                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
682                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
683                 nfs_vmtruncate(inode, attr->ia_size);
684         }
685         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
686                 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
687                 if ((attr->ia_valid & ATTR_MODE) != 0) {
688                         int mode = attr->ia_mode & S_IALLUGO;
689                         mode |= inode->i_mode & ~S_IALLUGO;
690                         inode->i_mode = mode;
691                 }
692                 if ((attr->ia_valid & ATTR_UID) != 0)
693                         inode->i_uid = attr->ia_uid;
694                 if ((attr->ia_valid & ATTR_GID) != 0)
695                         inode->i_gid = attr->ia_gid;
696                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
697                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
698                 else
699                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
700                                         | NFS_INO_INVALID_CTIME);
701                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
702                                 | NFS_INO_INVALID_ACL);
703         }
704         if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
705                 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
706                                 | NFS_INO_INVALID_CTIME);
707                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
708                         inode->i_atime = timespec_to_timespec64(fattr->atime);
709                 else if (attr->ia_valid & ATTR_ATIME_SET)
710                         inode->i_atime = attr->ia_atime;
711                 else
712                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
713 
714                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
715                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
716                 else
717                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
718                                         | NFS_INO_INVALID_CTIME);
719         }
720         if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
721                 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
722                                 | NFS_INO_INVALID_CTIME);
723                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
724                         inode->i_mtime = timespec_to_timespec64(fattr->mtime);
725                 else if (attr->ia_valid & ATTR_MTIME_SET)
726                         inode->i_mtime = attr->ia_mtime;
727                 else
728                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
729 
730                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
731                         inode->i_ctime = timespec_to_timespec64(fattr->ctime);
732                 else
733                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
734                                         | NFS_INO_INVALID_CTIME);
735         }
736         if (fattr->valid)
737                 nfs_update_inode(inode, fattr);
738         spin_unlock(&inode->i_lock);
739 }
740 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
741 
742 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
743 {
744         struct dentry *parent;
745 
746         if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
747                 return;
748         parent = dget_parent(dentry);
749         nfs_force_use_readdirplus(d_inode(parent));
750         dput(parent);
751 }
752 
753 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
754 {
755         struct dentry *parent;
756 
757         if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
758                 return;
759         parent = dget_parent(dentry);
760         nfs_advise_use_readdirplus(d_inode(parent));
761         dput(parent);
762 }
763 
764 static bool nfs_need_revalidate_inode(struct inode *inode)
765 {
766         if (NFS_I(inode)->cache_validity &
767                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
768                 return true;
769         if (nfs_attribute_cache_expired(inode))
770                 return true;
771         return false;
772 }
773 
774 int nfs_getattr(const struct path *path, struct kstat *stat,
775                 u32 request_mask, unsigned int query_flags)
776 {
777         struct inode *inode = d_inode(path->dentry);
778         struct nfs_server *server = NFS_SERVER(inode);
779         unsigned long cache_validity;
780         int err = 0;
781         bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
782         bool do_update = false;
783 
784         trace_nfs_getattr_enter(inode);
785 
786         if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
787                 goto out_no_update;
788 
789         /* Flush out writes to the server in order to update c/mtime.  */
790         if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
791                         S_ISREG(inode->i_mode)) {
792                 err = filemap_write_and_wait(inode->i_mapping);
793                 if (err)
794                         goto out;
795         }
796 
797         /*
798          * We may force a getattr if the user cares about atime.
799          *
800          * Note that we only have to check the vfsmount flags here:
801          *  - NFS always sets S_NOATIME by so checking it would give a
802          *    bogus result
803          *  - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
804          *    no point in checking those.
805          */
806         if ((path->mnt->mnt_flags & MNT_NOATIME) ||
807             ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
808                 request_mask &= ~STATX_ATIME;
809 
810         /* Is the user requesting attributes that might need revalidation? */
811         if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
812                                         STATX_MTIME|STATX_UID|STATX_GID|
813                                         STATX_SIZE|STATX_BLOCKS)))
814                 goto out_no_revalidate;
815 
816         /* Check whether the cached attributes are stale */
817         do_update |= force_sync || nfs_attribute_cache_expired(inode);
818         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
819         do_update |= cache_validity &
820                 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
821         if (request_mask & STATX_ATIME)
822                 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
823         if (request_mask & (STATX_CTIME|STATX_MTIME))
824                 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
825         if (do_update) {
826                 /* Update the attribute cache */
827                 if (!(server->flags & NFS_MOUNT_NOAC))
828                         nfs_readdirplus_parent_cache_miss(path->dentry);
829                 else
830                         nfs_readdirplus_parent_cache_hit(path->dentry);
831                 err = __nfs_revalidate_inode(server, inode);
832                 if (err)
833                         goto out;
834         } else
835                 nfs_readdirplus_parent_cache_hit(path->dentry);
836 out_no_revalidate:
837         /* Only return attributes that were revalidated. */
838         stat->result_mask &= request_mask;
839 out_no_update:
840         generic_fillattr(inode, stat);
841         stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
842         if (S_ISDIR(inode->i_mode))
843                 stat->blksize = NFS_SERVER(inode)->dtsize;
844 out:
845         trace_nfs_getattr_exit(inode, err);
846         return err;
847 }
848 EXPORT_SYMBOL_GPL(nfs_getattr);
849 
850 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
851 {
852         refcount_set(&l_ctx->count, 1);
853         l_ctx->lockowner = current->files;
854         INIT_LIST_HEAD(&l_ctx->list);
855         atomic_set(&l_ctx->io_count, 0);
856 }
857 
858 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
859 {
860         struct nfs_lock_context *pos;
861 
862         list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
863                 if (pos->lockowner != current->files)
864                         continue;
865                 if (refcount_inc_not_zero(&pos->count))
866                         return pos;
867         }
868         return NULL;
869 }
870 
871 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
872 {
873         struct nfs_lock_context *res, *new = NULL;
874         struct inode *inode = d_inode(ctx->dentry);
875 
876         rcu_read_lock();
877         res = __nfs_find_lock_context(ctx);
878         rcu_read_unlock();
879         if (res == NULL) {
880                 new = kmalloc(sizeof(*new), GFP_KERNEL);
881                 if (new == NULL)
882                         return ERR_PTR(-ENOMEM);
883                 nfs_init_lock_context(new);
884                 spin_lock(&inode->i_lock);
885                 res = __nfs_find_lock_context(ctx);
886                 if (res == NULL) {
887                         list_add_tail_rcu(&new->list, &ctx->lock_context.list);
888                         new->open_context = ctx;
889                         res = new;
890                         new = NULL;
891                 }
892                 spin_unlock(&inode->i_lock);
893                 kfree(new);
894         }
895         return res;
896 }
897 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
898 
899 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
900 {
901         struct nfs_open_context *ctx = l_ctx->open_context;
902         struct inode *inode = d_inode(ctx->dentry);
903 
904         if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
905                 return;
906         list_del_rcu(&l_ctx->list);
907         spin_unlock(&inode->i_lock);
908         kfree_rcu(l_ctx, rcu_head);
909 }
910 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
911 
912 /**
913  * nfs_close_context - Common close_context() routine NFSv2/v3
914  * @ctx: pointer to context
915  * @is_sync: is this a synchronous close
916  *
917  * Ensure that the attributes are up to date if we're mounted
918  * with close-to-open semantics and we have cached data that will
919  * need to be revalidated on open.
920  */
921 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
922 {
923         struct nfs_inode *nfsi;
924         struct inode *inode;
925         struct nfs_server *server;
926 
927         if (!(ctx->mode & FMODE_WRITE))
928                 return;
929         if (!is_sync)
930                 return;
931         inode = d_inode(ctx->dentry);
932         if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
933                 return;
934         nfsi = NFS_I(inode);
935         if (inode->i_mapping->nrpages == 0)
936                 return;
937         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
938                 return;
939         if (!list_empty(&nfsi->open_files))
940                 return;
941         server = NFS_SERVER(inode);
942         if (server->flags & NFS_MOUNT_NOCTO)
943                 return;
944         nfs_revalidate_inode(server, inode);
945 }
946 EXPORT_SYMBOL_GPL(nfs_close_context);
947 
948 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
949                                                 fmode_t f_mode,
950                                                 struct file *filp)
951 {
952         struct nfs_open_context *ctx;
953         const struct cred *cred = get_current_cred();
954 
955         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
956         if (!ctx) {
957                 put_cred(cred);
958                 return ERR_PTR(-ENOMEM);
959         }
960         nfs_sb_active(dentry->d_sb);
961         ctx->dentry = dget(dentry);
962         ctx->cred = cred;
963         ctx->ll_cred = NULL;
964         ctx->state = NULL;
965         ctx->mode = f_mode;
966         ctx->flags = 0;
967         ctx->error = 0;
968         ctx->flock_owner = (fl_owner_t)filp;
969         nfs_init_lock_context(&ctx->lock_context);
970         ctx->lock_context.open_context = ctx;
971         INIT_LIST_HEAD(&ctx->list);
972         ctx->mdsthreshold = NULL;
973         return ctx;
974 }
975 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
976 
977 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
978 {
979         if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
980                 return ctx;
981         return NULL;
982 }
983 EXPORT_SYMBOL_GPL(get_nfs_open_context);
984 
985 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
986 {
987         struct inode *inode = d_inode(ctx->dentry);
988         struct super_block *sb = ctx->dentry->d_sb;
989 
990         if (!refcount_dec_and_test(&ctx->lock_context.count))
991                 return;
992         if (!list_empty(&ctx->list)) {
993                 spin_lock(&inode->i_lock);
994                 list_del_rcu(&ctx->list);
995                 spin_unlock(&inode->i_lock);
996         }
997         if (inode != NULL)
998                 NFS_PROTO(inode)->close_context(ctx, is_sync);
999         put_cred(ctx->cred);
1000         dput(ctx->dentry);
1001         nfs_sb_deactive(sb);
1002         put_rpccred(ctx->ll_cred);
1003         kfree(ctx->mdsthreshold);
1004         kfree_rcu(ctx, rcu_head);
1005 }
1006 
1007 void put_nfs_open_context(struct nfs_open_context *ctx)
1008 {
1009         __put_nfs_open_context(ctx, 0);
1010 }
1011 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1012 
1013 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1014 {
1015         __put_nfs_open_context(ctx, 1);
1016 }
1017 
1018 /*
1019  * Ensure that mmap has a recent RPC credential for use when writing out
1020  * shared pages
1021  */
1022 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1023 {
1024         struct inode *inode = d_inode(ctx->dentry);
1025         struct nfs_inode *nfsi = NFS_I(inode);
1026 
1027         spin_lock(&inode->i_lock);
1028         list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1029         spin_unlock(&inode->i_lock);
1030 }
1031 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1032 
1033 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1034 {
1035         filp->private_data = get_nfs_open_context(ctx);
1036         if (list_empty(&ctx->list))
1037                 nfs_inode_attach_open_context(ctx);
1038 }
1039 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1040 
1041 /*
1042  * Given an inode, search for an open context with the desired characteristics
1043  */
1044 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1045 {
1046         struct nfs_inode *nfsi = NFS_I(inode);
1047         struct nfs_open_context *pos, *ctx = NULL;
1048 
1049         rcu_read_lock();
1050         list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1051                 if (cred != NULL && pos->cred != cred)
1052                         continue;
1053                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1054                         continue;
1055                 ctx = get_nfs_open_context(pos);
1056                 if (ctx)
1057                         break;
1058         }
1059         rcu_read_unlock();
1060         return ctx;
1061 }
1062 
1063 void nfs_file_clear_open_context(struct file *filp)
1064 {
1065         struct nfs_open_context *ctx = nfs_file_open_context(filp);
1066 
1067         if (ctx) {
1068                 struct inode *inode = d_inode(ctx->dentry);
1069 
1070                 /*
1071                  * We fatal error on write before. Try to writeback
1072                  * every page again.
1073                  */
1074                 if (ctx->error < 0)
1075                         invalidate_inode_pages2(inode->i_mapping);
1076                 filp->private_data = NULL;
1077                 put_nfs_open_context_sync(ctx);
1078         }
1079 }
1080 
1081 /*
1082  * These allocate and release file read/write context information.
1083  */
1084 int nfs_open(struct inode *inode, struct file *filp)
1085 {
1086         struct nfs_open_context *ctx;
1087 
1088         ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1089         if (IS_ERR(ctx))
1090                 return PTR_ERR(ctx);
1091         nfs_file_set_open_context(filp, ctx);
1092         put_nfs_open_context(ctx);
1093         nfs_fscache_open_file(inode, filp);
1094         return 0;
1095 }
1096 
1097 /*
1098  * This function is called whenever some part of NFS notices that
1099  * the cached attributes have to be refreshed.
1100  */
1101 int
1102 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1103 {
1104         int              status = -ESTALE;
1105         struct nfs4_label *label = NULL;
1106         struct nfs_fattr *fattr = NULL;
1107         struct nfs_inode *nfsi = NFS_I(inode);
1108 
1109         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1110                 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1111 
1112         trace_nfs_revalidate_inode_enter(inode);
1113 
1114         if (is_bad_inode(inode))
1115                 goto out;
1116         if (NFS_STALE(inode))
1117                 goto out;
1118 
1119         /* pNFS: Attributes aren't updated until we layoutcommit */
1120         if (S_ISREG(inode->i_mode)) {
1121                 status = pnfs_sync_inode(inode, false);
1122                 if (status)
1123                         goto out;
1124         }
1125 
1126         status = -ENOMEM;
1127         fattr = nfs_alloc_fattr();
1128         if (fattr == NULL)
1129                 goto out;
1130 
1131         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1132 
1133         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1134         if (IS_ERR(label)) {
1135                 status = PTR_ERR(label);
1136                 goto out;
1137         }
1138 
1139         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1140                         label, inode);
1141         if (status != 0) {
1142                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1143                          inode->i_sb->s_id,
1144                          (unsigned long long)NFS_FILEID(inode), status);
1145                 if (status == -ESTALE) {
1146                         nfs_zap_caches(inode);
1147                         if (!S_ISDIR(inode->i_mode))
1148                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1149                 }
1150                 goto err_out;
1151         }
1152 
1153         status = nfs_refresh_inode(inode, fattr);
1154         if (status) {
1155                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1156                          inode->i_sb->s_id,
1157                          (unsigned long long)NFS_FILEID(inode), status);
1158                 goto err_out;
1159         }
1160 
1161         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1162                 nfs_zap_acl_cache(inode);
1163 
1164         nfs_setsecurity(inode, fattr, label);
1165 
1166         dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1167                 inode->i_sb->s_id,
1168                 (unsigned long long)NFS_FILEID(inode));
1169 
1170 err_out:
1171         nfs4_label_free(label);
1172 out:
1173         nfs_free_fattr(fattr);
1174         trace_nfs_revalidate_inode_exit(inode, status);
1175         return status;
1176 }
1177 
1178 int nfs_attribute_cache_expired(struct inode *inode)
1179 {
1180         if (nfs_have_delegated_attributes(inode))
1181                 return 0;
1182         return nfs_attribute_timeout(inode);
1183 }
1184 
1185 /**
1186  * nfs_revalidate_inode - Revalidate the inode attributes
1187  * @server - pointer to nfs_server struct
1188  * @inode - pointer to inode struct
1189  *
1190  * Updates inode attribute information by retrieving the data from the server.
1191  */
1192 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1193 {
1194         if (!nfs_need_revalidate_inode(inode))
1195                 return NFS_STALE(inode) ? -ESTALE : 0;
1196         return __nfs_revalidate_inode(server, inode);
1197 }
1198 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1199 
1200 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1201 {
1202         struct nfs_inode *nfsi = NFS_I(inode);
1203         int ret;
1204 
1205         if (mapping->nrpages != 0) {
1206                 if (S_ISREG(inode->i_mode)) {
1207                         ret = nfs_sync_mapping(mapping);
1208                         if (ret < 0)
1209                                 return ret;
1210                 }
1211                 ret = invalidate_inode_pages2(mapping);
1212                 if (ret < 0)
1213                         return ret;
1214         }
1215         if (S_ISDIR(inode->i_mode)) {
1216                 spin_lock(&inode->i_lock);
1217                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1218                 spin_unlock(&inode->i_lock);
1219         }
1220         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1221         nfs_fscache_wait_on_invalidate(inode);
1222 
1223         dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1224                         inode->i_sb->s_id,
1225                         (unsigned long long)NFS_FILEID(inode));
1226         return 0;
1227 }
1228 
1229 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1230 {
1231         return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1232                 NFS_STALE(inode);
1233 }
1234 
1235 int nfs_revalidate_mapping_rcu(struct inode *inode)
1236 {
1237         struct nfs_inode *nfsi = NFS_I(inode);
1238         unsigned long *bitlock = &nfsi->flags;
1239         int ret = 0;
1240 
1241         if (IS_SWAPFILE(inode))
1242                 goto out;
1243         if (nfs_mapping_need_revalidate_inode(inode)) {
1244                 ret = -ECHILD;
1245                 goto out;
1246         }
1247         spin_lock(&inode->i_lock);
1248         if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1249             (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1250                 ret = -ECHILD;
1251         spin_unlock(&inode->i_lock);
1252 out:
1253         return ret;
1254 }
1255 
1256 /**
1257  * nfs_revalidate_mapping - Revalidate the pagecache
1258  * @inode - pointer to host inode
1259  * @mapping - pointer to mapping
1260  */
1261 int nfs_revalidate_mapping(struct inode *inode,
1262                 struct address_space *mapping)
1263 {
1264         struct nfs_inode *nfsi = NFS_I(inode);
1265         unsigned long *bitlock = &nfsi->flags;
1266         int ret = 0;
1267 
1268         /* swapfiles are not supposed to be shared. */
1269         if (IS_SWAPFILE(inode))
1270                 goto out;
1271 
1272         if (nfs_mapping_need_revalidate_inode(inode)) {
1273                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1274                 if (ret < 0)
1275                         goto out;
1276         }
1277 
1278         /*
1279          * We must clear NFS_INO_INVALID_DATA first to ensure that
1280          * invalidations that come in while we're shooting down the mappings
1281          * are respected. But, that leaves a race window where one revalidator
1282          * can clear the flag, and then another checks it before the mapping
1283          * gets invalidated. Fix that by serializing access to this part of
1284          * the function.
1285          *
1286          * At the same time, we need to allow other tasks to see whether we
1287          * might be in the middle of invalidating the pages, so we only set
1288          * the bit lock here if it looks like we're going to be doing that.
1289          */
1290         for (;;) {
1291                 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1292                                          nfs_wait_bit_killable, TASK_KILLABLE);
1293                 if (ret)
1294                         goto out;
1295                 spin_lock(&inode->i_lock);
1296                 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1297                         spin_unlock(&inode->i_lock);
1298                         continue;
1299                 }
1300                 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1301                         break;
1302                 spin_unlock(&inode->i_lock);
1303                 goto out;
1304         }
1305 
1306         set_bit(NFS_INO_INVALIDATING, bitlock);
1307         smp_wmb();
1308         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1309         spin_unlock(&inode->i_lock);
1310         trace_nfs_invalidate_mapping_enter(inode);
1311         ret = nfs_invalidate_mapping(inode, mapping);
1312         trace_nfs_invalidate_mapping_exit(inode, ret);
1313 
1314         clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1315         smp_mb__after_atomic();
1316         wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1317 out:
1318         return ret;
1319 }
1320 
1321 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1322 {
1323         struct inode *inode = &nfsi->vfs_inode;
1324 
1325         if (!S_ISREG(inode->i_mode))
1326                 return false;
1327         if (list_empty(&nfsi->open_files))
1328                 return false;
1329         return inode_is_open_for_write(inode);
1330 }
1331 
1332 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1333 {
1334         return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1335 }
1336 
1337 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1338 {
1339         struct timespec ts;
1340 
1341         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1342                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1343                         && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1344                 inode_set_iversion_raw(inode, fattr->change_attr);
1345                 if (S_ISDIR(inode->i_mode))
1346                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1347         }
1348         /* If we have atomic WCC data, we may update some attributes */
1349         ts = timespec64_to_timespec(inode->i_ctime);
1350         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1351                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1352                         && timespec_equal(&ts, &fattr->pre_ctime)) {
1353                 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1354         }
1355 
1356         ts = timespec64_to_timespec(inode->i_mtime);
1357         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1358                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1359                         && timespec_equal(&ts, &fattr->pre_mtime)) {
1360                 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1361                 if (S_ISDIR(inode->i_mode))
1362                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1363         }
1364         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1365                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1366                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1367                         && !nfs_have_writebacks(inode)) {
1368                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1369         }
1370 }
1371 
1372 /**
1373  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1374  * @inode - pointer to inode
1375  * @fattr - updated attributes
1376  *
1377  * Verifies the attribute cache. If we have just changed the attributes,
1378  * so that fattr carries weak cache consistency data, then it may
1379  * also update the ctime/mtime/change_attribute.
1380  */
1381 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1382 {
1383         struct nfs_inode *nfsi = NFS_I(inode);
1384         loff_t cur_size, new_isize;
1385         unsigned long invalid = 0;
1386         struct timespec ts;
1387 
1388         if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1389                 return 0;
1390 
1391         /* Has the inode gone and changed behind our back? */
1392         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1393                 return -ESTALE;
1394         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1395                 return -ESTALE;
1396 
1397         if (!nfs_file_has_buffered_writers(nfsi)) {
1398                 /* Verify a few of the more important attributes */
1399                 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1400                         invalid |= NFS_INO_INVALID_CHANGE
1401                                 | NFS_INO_REVAL_PAGECACHE;
1402 
1403                 ts = timespec64_to_timespec(inode->i_mtime);
1404                 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
1405                         invalid |= NFS_INO_INVALID_MTIME;
1406 
1407                 ts = timespec64_to_timespec(inode->i_ctime);
1408                 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
1409                         invalid |= NFS_INO_INVALID_CTIME;
1410 
1411                 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1412                         cur_size = i_size_read(inode);
1413                         new_isize = nfs_size_to_loff_t(fattr->size);
1414                         if (cur_size != new_isize)
1415                                 invalid |= NFS_INO_INVALID_SIZE
1416                                         | NFS_INO_REVAL_PAGECACHE;
1417                 }
1418         }
1419 
1420         /* Have any file permissions changed? */
1421         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1422                 invalid |= NFS_INO_INVALID_ACCESS
1423                         | NFS_INO_INVALID_ACL
1424                         | NFS_INO_INVALID_OTHER;
1425         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1426                 invalid |= NFS_INO_INVALID_ACCESS
1427                         | NFS_INO_INVALID_ACL
1428                         | NFS_INO_INVALID_OTHER;
1429         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1430                 invalid |= NFS_INO_INVALID_ACCESS
1431                         | NFS_INO_INVALID_ACL
1432                         | NFS_INO_INVALID_OTHER;
1433 
1434         /* Has the link count changed? */
1435         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1436                 invalid |= NFS_INO_INVALID_OTHER;
1437 
1438         ts = timespec64_to_timespec(inode->i_atime);
1439         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
1440                 invalid |= NFS_INO_INVALID_ATIME;
1441 
1442         if (invalid != 0)
1443                 nfs_set_cache_invalid(inode, invalid);
1444 
1445         nfsi->read_cache_jiffies = fattr->time_start;
1446         return 0;
1447 }
1448 
1449 static atomic_long_t nfs_attr_generation_counter;
1450 
1451 static unsigned long nfs_read_attr_generation_counter(void)
1452 {
1453         return atomic_long_read(&nfs_attr_generation_counter);
1454 }
1455 
1456 unsigned long nfs_inc_attr_generation_counter(void)
1457 {
1458         return atomic_long_inc_return(&nfs_attr_generation_counter);
1459 }
1460 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1461 
1462 void nfs_fattr_init(struct nfs_fattr *fattr)
1463 {
1464         fattr->valid = 0;
1465         fattr->time_start = jiffies;
1466         fattr->gencount = nfs_inc_attr_generation_counter();
1467         fattr->owner_name = NULL;
1468         fattr->group_name = NULL;
1469 }
1470 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1471 
1472 /**
1473  * nfs_fattr_set_barrier
1474  * @fattr: attributes
1475  *
1476  * Used to set a barrier after an attribute was updated. This
1477  * barrier ensures that older attributes from RPC calls that may
1478  * have raced with our update cannot clobber these new values.
1479  * Note that you are still responsible for ensuring that other
1480  * operations which change the attribute on the server do not
1481  * collide.
1482  */
1483 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1484 {
1485         fattr->gencount = nfs_inc_attr_generation_counter();
1486 }
1487 
1488 struct nfs_fattr *nfs_alloc_fattr(void)
1489 {
1490         struct nfs_fattr *fattr;
1491 
1492         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1493         if (fattr != NULL)
1494                 nfs_fattr_init(fattr);
1495         return fattr;
1496 }
1497 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1498 
1499 struct nfs_fh *nfs_alloc_fhandle(void)
1500 {
1501         struct nfs_fh *fh;
1502 
1503         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1504         if (fh != NULL)
1505                 fh->size = 0;
1506         return fh;
1507 }
1508 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1509 
1510 #ifdef NFS_DEBUG
1511 /*
1512  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1513  *                             in the same way that wireshark does
1514  *
1515  * @fh: file handle
1516  *
1517  * For debugging only.
1518  */
1519 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1520 {
1521         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1522          * not on the result */
1523         return nfs_fhandle_hash(fh);
1524 }
1525 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1526 
1527 /*
1528  * _nfs_display_fhandle - display an NFS file handle on the console
1529  *
1530  * @fh: file handle to display
1531  * @caption: display caption
1532  *
1533  * For debugging only.
1534  */
1535 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1536 {
1537         unsigned short i;
1538 
1539         if (fh == NULL || fh->size == 0) {
1540                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1541                 return;
1542         }
1543 
1544         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1545                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1546         for (i = 0; i < fh->size; i += 16) {
1547                 __be32 *pos = (__be32 *)&fh->data[i];
1548 
1549                 switch ((fh->size - i - 1) >> 2) {
1550                 case 0:
1551                         printk(KERN_DEFAULT " %08x\n",
1552                                 be32_to_cpup(pos));
1553                         break;
1554                 case 1:
1555                         printk(KERN_DEFAULT " %08x %08x\n",
1556                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1557                         break;
1558                 case 2:
1559                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1560                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1561                                 be32_to_cpup(pos + 2));
1562                         break;
1563                 default:
1564                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1565                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1566                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1567                 }
1568         }
1569 }
1570 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1571 #endif
1572 
1573 /**
1574  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1575  * @inode - pointer to inode
1576  * @fattr - attributes
1577  *
1578  * Attempt to divine whether or not an RPC call reply carrying stale
1579  * attributes got scheduled after another call carrying updated ones.
1580  *
1581  * To do so, the function first assumes that a more recent ctime means
1582  * that the attributes in fattr are newer, however it also attempt to
1583  * catch the case where ctime either didn't change, or went backwards
1584  * (if someone reset the clock on the server) by looking at whether
1585  * or not this RPC call was started after the inode was last updated.
1586  * Note also the check for wraparound of 'attr_gencount'
1587  *
1588  * The function returns 'true' if it thinks the attributes in 'fattr' are
1589  * more recent than the ones cached in the inode.
1590  *
1591  */
1592 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1593 {
1594         const struct nfs_inode *nfsi = NFS_I(inode);
1595 
1596         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1597                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1598 }
1599 
1600 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1601 {
1602         int ret;
1603 
1604         trace_nfs_refresh_inode_enter(inode);
1605 
1606         if (nfs_inode_attrs_need_update(inode, fattr))
1607                 ret = nfs_update_inode(inode, fattr);
1608         else
1609                 ret = nfs_check_inode_attributes(inode, fattr);
1610 
1611         trace_nfs_refresh_inode_exit(inode, ret);
1612         return ret;
1613 }
1614 
1615 /**
1616  * nfs_refresh_inode - try to update the inode attribute cache
1617  * @inode - pointer to inode
1618  * @fattr - updated attributes
1619  *
1620  * Check that an RPC call that returned attributes has not overlapped with
1621  * other recent updates of the inode metadata, then decide whether it is
1622  * safe to do a full update of the inode attributes, or whether just to
1623  * call nfs_check_inode_attributes.
1624  */
1625 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1626 {
1627         int status;
1628 
1629         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1630                 return 0;
1631         spin_lock(&inode->i_lock);
1632         status = nfs_refresh_inode_locked(inode, fattr);
1633         spin_unlock(&inode->i_lock);
1634 
1635         return status;
1636 }
1637 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1638 
1639 static int nfs_post_op_update_inode_locked(struct inode *inode,
1640                 struct nfs_fattr *fattr, unsigned int invalid)
1641 {
1642         if (S_ISDIR(inode->i_mode))
1643                 invalid |= NFS_INO_INVALID_DATA;
1644         nfs_set_cache_invalid(inode, invalid);
1645         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1646                 return 0;
1647         return nfs_refresh_inode_locked(inode, fattr);
1648 }
1649 
1650 /**
1651  * nfs_post_op_update_inode - try to update the inode attribute cache
1652  * @inode - pointer to inode
1653  * @fattr - updated attributes
1654  *
1655  * After an operation that has changed the inode metadata, mark the
1656  * attribute cache as being invalid, then try to update it.
1657  *
1658  * NB: if the server didn't return any post op attributes, this
1659  * function will force the retrieval of attributes before the next
1660  * NFS request.  Thus it should be used only for operations that
1661  * are expected to change one or more attributes, to avoid
1662  * unnecessary NFS requests and trips through nfs_update_inode().
1663  */
1664 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1665 {
1666         int status;
1667 
1668         spin_lock(&inode->i_lock);
1669         nfs_fattr_set_barrier(fattr);
1670         status = nfs_post_op_update_inode_locked(inode, fattr,
1671                         NFS_INO_INVALID_CHANGE
1672                         | NFS_INO_INVALID_CTIME
1673                         | NFS_INO_REVAL_FORCED);
1674         spin_unlock(&inode->i_lock);
1675 
1676         return status;
1677 }
1678 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1679 
1680 /**
1681  * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1682  * @inode - pointer to inode
1683  * @fattr - updated attributes
1684  *
1685  * After an operation that has changed the inode metadata, mark the
1686  * attribute cache as being invalid, then try to update it. Fake up
1687  * weak cache consistency data, if none exist.
1688  *
1689  * This function is mainly designed to be used by the ->write_done() functions.
1690  */
1691 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1692 {
1693         int status;
1694 
1695         /* Don't do a WCC update if these attributes are already stale */
1696         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1697                         !nfs_inode_attrs_need_update(inode, fattr)) {
1698                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1699                                 | NFS_ATTR_FATTR_PRESIZE
1700                                 | NFS_ATTR_FATTR_PREMTIME
1701                                 | NFS_ATTR_FATTR_PRECTIME);
1702                 goto out_noforce;
1703         }
1704         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1705                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1706                 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1707                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1708         }
1709         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1710                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1711                 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
1712                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1713         }
1714         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1715                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1716                 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
1717                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1718         }
1719         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1720                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1721                 fattr->pre_size = i_size_read(inode);
1722                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1723         }
1724 out_noforce:
1725         status = nfs_post_op_update_inode_locked(inode, fattr,
1726                         NFS_INO_INVALID_CHANGE
1727                         | NFS_INO_INVALID_CTIME
1728                         | NFS_INO_INVALID_MTIME);
1729         return status;
1730 }
1731 
1732 /**
1733  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1734  * @inode - pointer to inode
1735  * @fattr - updated attributes
1736  *
1737  * After an operation that has changed the inode metadata, mark the
1738  * attribute cache as being invalid, then try to update it. Fake up
1739  * weak cache consistency data, if none exist.
1740  *
1741  * This function is mainly designed to be used by the ->write_done() functions.
1742  */
1743 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1744 {
1745         int status;
1746 
1747         spin_lock(&inode->i_lock);
1748         nfs_fattr_set_barrier(fattr);
1749         status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1750         spin_unlock(&inode->i_lock);
1751         return status;
1752 }
1753 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1754 
1755 
1756 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1757                                     struct nfs_fattr *fattr)
1758 {
1759         bool ret1 = true, ret2 = true;
1760 
1761         if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1762                 ret1 = (nfsi->fileid == fattr->fileid);
1763         if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1764                 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1765         return ret1 || ret2;
1766 }
1767 
1768 /*
1769  * Many nfs protocol calls return the new file attributes after
1770  * an operation.  Here we update the inode to reflect the state
1771  * of the server's inode.
1772  *
1773  * This is a bit tricky because we have to make sure all dirty pages
1774  * have been sent off to the server before calling invalidate_inode_pages.
1775  * To make sure no other process adds more write requests while we try
1776  * our best to flush them, we make them sleep during the attribute refresh.
1777  *
1778  * A very similar scenario holds for the dir cache.
1779  */
1780 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1781 {
1782         struct nfs_server *server;
1783         struct nfs_inode *nfsi = NFS_I(inode);
1784         loff_t cur_isize, new_isize;
1785         unsigned long invalid = 0;
1786         unsigned long now = jiffies;
1787         unsigned long save_cache_validity;
1788         bool have_writers = nfs_file_has_buffered_writers(nfsi);
1789         bool cache_revalidated = true;
1790         bool attr_changed = false;
1791         bool have_delegation;
1792 
1793         dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1794                         __func__, inode->i_sb->s_id, inode->i_ino,
1795                         nfs_display_fhandle_hash(NFS_FH(inode)),
1796                         atomic_read(&inode->i_count), fattr->valid);
1797 
1798         if (!nfs_fileid_valid(nfsi, fattr)) {
1799                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1800                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1801                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1802                         inode->i_sb->s_id, (long long)nfsi->fileid,
1803                         (long long)fattr->fileid);
1804                 goto out_err;
1805         }
1806 
1807         /*
1808          * Make sure the inode's type hasn't changed.
1809          */
1810         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1811                 /*
1812                 * Big trouble! The inode has become a different object.
1813                 */
1814                 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1815                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1816                 goto out_err;
1817         }
1818 
1819         server = NFS_SERVER(inode);
1820         /* Update the fsid? */
1821         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1822                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1823                         !IS_AUTOMOUNT(inode))
1824                 server->fsid = fattr->fsid;
1825 
1826         /* Save the delegation state before clearing cache_validity */
1827         have_delegation = nfs_have_delegated_attributes(inode);
1828 
1829         /*
1830          * Update the read time so we don't revalidate too often.
1831          */
1832         nfsi->read_cache_jiffies = fattr->time_start;
1833 
1834         save_cache_validity = nfsi->cache_validity;
1835         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1836                         | NFS_INO_INVALID_ATIME
1837                         | NFS_INO_REVAL_FORCED
1838                         | NFS_INO_REVAL_PAGECACHE);
1839 
1840         /* Do atomic weak cache consistency updates */
1841         nfs_wcc_update_inode(inode, fattr);
1842 
1843         if (pnfs_layoutcommit_outstanding(inode)) {
1844                 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1845                 cache_revalidated = false;
1846         }
1847 
1848         /* More cache consistency checks */
1849         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1850                 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1851                         /* Could it be a race with writeback? */
1852                         if (!(have_writers || have_delegation)) {
1853                                 invalid |= NFS_INO_INVALID_DATA
1854                                         | NFS_INO_INVALID_ACCESS
1855                                         | NFS_INO_INVALID_ACL;
1856                                 /* Force revalidate of all attributes */
1857                                 save_cache_validity |= NFS_INO_INVALID_CTIME
1858                                         | NFS_INO_INVALID_MTIME
1859                                         | NFS_INO_INVALID_SIZE
1860                                         | NFS_INO_INVALID_OTHER;
1861                                 if (S_ISDIR(inode->i_mode))
1862                                         nfs_force_lookup_revalidate(inode);
1863                                 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1864                                                 inode->i_sb->s_id,
1865                                                 inode->i_ino);
1866                         }
1867                         inode_set_iversion_raw(inode, fattr->change_attr);
1868                         attr_changed = true;
1869                 }
1870         } else {
1871                 nfsi->cache_validity |= save_cache_validity &
1872                                 (NFS_INO_INVALID_CHANGE
1873                                 | NFS_INO_REVAL_PAGECACHE
1874                                 | NFS_INO_REVAL_FORCED);
1875                 cache_revalidated = false;
1876         }
1877 
1878         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1879                 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1880         } else if (server->caps & NFS_CAP_MTIME) {
1881                 nfsi->cache_validity |= save_cache_validity &
1882                                 (NFS_INO_INVALID_MTIME
1883                                 | NFS_INO_REVAL_FORCED);
1884                 cache_revalidated = false;
1885         }
1886 
1887         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1888                 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1889         } else if (server->caps & NFS_CAP_CTIME) {
1890                 nfsi->cache_validity |= save_cache_validity &
1891                                 (NFS_INO_INVALID_CTIME
1892                                 | NFS_INO_REVAL_FORCED);
1893                 cache_revalidated = false;
1894         }
1895 
1896         /* Check if our cached file size is stale */
1897         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1898                 new_isize = nfs_size_to_loff_t(fattr->size);
1899                 cur_isize = i_size_read(inode);
1900                 if (new_isize != cur_isize && !have_delegation) {
1901                         /* Do we perhaps have any outstanding writes, or has
1902                          * the file grown beyond our last write? */
1903                         if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1904                                 i_size_write(inode, new_isize);
1905                                 if (!have_writers)
1906                                         invalid |= NFS_INO_INVALID_DATA;
1907                                 attr_changed = true;
1908                         }
1909                         dprintk("NFS: isize change on server for file %s/%ld "
1910                                         "(%Ld to %Ld)\n",
1911                                         inode->i_sb->s_id,
1912                                         inode->i_ino,
1913                                         (long long)cur_isize,
1914                                         (long long)new_isize);
1915                 }
1916         } else {
1917                 nfsi->cache_validity |= save_cache_validity &
1918                                 (NFS_INO_INVALID_SIZE
1919                                 | NFS_INO_REVAL_PAGECACHE
1920                                 | NFS_INO_REVAL_FORCED);
1921                 cache_revalidated = false;
1922         }
1923 
1924 
1925         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1926                 inode->i_atime = timespec_to_timespec64(fattr->atime);
1927         else if (server->caps & NFS_CAP_ATIME) {
1928                 nfsi->cache_validity |= save_cache_validity &
1929                                 (NFS_INO_INVALID_ATIME
1930                                 | NFS_INO_REVAL_FORCED);
1931                 cache_revalidated = false;
1932         }
1933 
1934         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1935                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1936                         umode_t newmode = inode->i_mode & S_IFMT;
1937                         newmode |= fattr->mode & S_IALLUGO;
1938                         inode->i_mode = newmode;
1939                         invalid |= NFS_INO_INVALID_ACCESS
1940                                 | NFS_INO_INVALID_ACL;
1941                         attr_changed = true;
1942                 }
1943         } else if (server->caps & NFS_CAP_MODE) {
1944                 nfsi->cache_validity |= save_cache_validity &
1945                                 (NFS_INO_INVALID_OTHER
1946                                 | NFS_INO_REVAL_FORCED);
1947                 cache_revalidated = false;
1948         }
1949 
1950         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1951                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1952                         invalid |= NFS_INO_INVALID_ACCESS
1953                                 | NFS_INO_INVALID_ACL;
1954                         inode->i_uid = fattr->uid;
1955                         attr_changed = true;
1956                 }
1957         } else if (server->caps & NFS_CAP_OWNER) {
1958                 nfsi->cache_validity |= save_cache_validity &
1959                                 (NFS_INO_INVALID_OTHER
1960                                 | NFS_INO_REVAL_FORCED);
1961                 cache_revalidated = false;
1962         }
1963 
1964         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1965                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1966                         invalid |= NFS_INO_INVALID_ACCESS
1967                                 | NFS_INO_INVALID_ACL;
1968                         inode->i_gid = fattr->gid;
1969                         attr_changed = true;
1970                 }
1971         } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1972                 nfsi->cache_validity |= save_cache_validity &
1973                                 (NFS_INO_INVALID_OTHER
1974                                 | NFS_INO_REVAL_FORCED);
1975                 cache_revalidated = false;
1976         }
1977 
1978         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1979                 if (inode->i_nlink != fattr->nlink) {
1980                         if (S_ISDIR(inode->i_mode))
1981                                 invalid |= NFS_INO_INVALID_DATA;
1982                         set_nlink(inode, fattr->nlink);
1983                         attr_changed = true;
1984                 }
1985         } else if (server->caps & NFS_CAP_NLINK) {
1986                 nfsi->cache_validity |= save_cache_validity &
1987                                 (NFS_INO_INVALID_OTHER
1988                                 | NFS_INO_REVAL_FORCED);
1989                 cache_revalidated = false;
1990         }
1991 
1992         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1993                 /*
1994                  * report the blocks in 512byte units
1995                  */
1996                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1997         } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1998                 inode->i_blocks = fattr->du.nfs2.blocks;
1999         else
2000                 cache_revalidated = false;
2001 
2002         /* Update attrtimeo value if we're out of the unstable period */
2003         if (attr_changed) {
2004                 invalid &= ~NFS_INO_INVALID_ATTR;
2005                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2006                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2007                 nfsi->attrtimeo_timestamp = now;
2008                 /* Set barrier to be more recent than all outstanding updates */
2009                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2010         } else {
2011                 if (cache_revalidated) {
2012                         if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2013                                 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2014                                 nfsi->attrtimeo <<= 1;
2015                                 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2016                                         nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2017                         }
2018                         nfsi->attrtimeo_timestamp = now;
2019                 }
2020                 /* Set the barrier to be more recent than this fattr */
2021                 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2022                         nfsi->attr_gencount = fattr->gencount;
2023         }
2024 
2025         /* Don't invalidate the data if we were to blame */
2026         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2027                                 || S_ISLNK(inode->i_mode)))
2028                 invalid &= ~NFS_INO_INVALID_DATA;
2029         nfs_set_cache_invalid(inode, invalid);
2030 
2031         return 0;
2032  out_err:
2033         /*
2034          * No need to worry about unhashing the dentry, as the
2035          * lookup validation will know that the inode is bad.
2036          * (But we fall through to invalidate the caches.)
2037          */
2038         nfs_invalidate_inode(inode);
2039         return -ESTALE;
2040 }
2041 
2042 struct inode *nfs_alloc_inode(struct super_block *sb)
2043 {
2044         struct nfs_inode *nfsi;
2045         nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2046         if (!nfsi)
2047                 return NULL;
2048         nfsi->flags = 0UL;
2049         nfsi->cache_validity = 0UL;
2050 #if IS_ENABLED(CONFIG_NFS_V4)
2051         nfsi->nfs4_acl = NULL;
2052 #endif /* CONFIG_NFS_V4 */
2053         return &nfsi->vfs_inode;
2054 }
2055 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2056 
2057 static void nfs_i_callback(struct rcu_head *head)
2058 {
2059         struct inode *inode = container_of(head, struct inode, i_rcu);
2060         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2061 }
2062 
2063 void nfs_destroy_inode(struct inode *inode)
2064 {
2065         call_rcu(&inode->i_rcu, nfs_i_callback);
2066 }
2067 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
2068 
2069 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2070 {
2071 #if IS_ENABLED(CONFIG_NFS_V4)
2072         INIT_LIST_HEAD(&nfsi->open_states);
2073         nfsi->delegation = NULL;
2074         init_rwsem(&nfsi->rwsem);
2075         nfsi->layout = NULL;
2076 #endif
2077 }
2078 
2079 static void init_once(void *foo)
2080 {
2081         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2082 
2083         inode_init_once(&nfsi->vfs_inode);
2084         INIT_LIST_HEAD(&nfsi->open_files);
2085         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2086         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2087         INIT_LIST_HEAD(&nfsi->commit_info.list);
2088         atomic_long_set(&nfsi->nrequests, 0);
2089         atomic_long_set(&nfsi->commit_info.ncommit, 0);
2090         atomic_set(&nfsi->commit_info.rpcs_out, 0);
2091         init_rwsem(&nfsi->rmdir_sem);
2092         mutex_init(&nfsi->commit_mutex);
2093         nfs4_init_once(nfsi);
2094 }
2095 
2096 static int __init nfs_init_inodecache(void)
2097 {
2098         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2099                                              sizeof(struct nfs_inode),
2100                                              0, (SLAB_RECLAIM_ACCOUNT|
2101                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2102                                              init_once);
2103         if (nfs_inode_cachep == NULL)
2104                 return -ENOMEM;
2105 
2106         return 0;
2107 }
2108 
2109 static void nfs_destroy_inodecache(void)
2110 {
2111         /*
2112          * Make sure all delayed rcu free inodes are flushed before we
2113          * destroy cache.
2114          */
2115         rcu_barrier();
2116         kmem_cache_destroy(nfs_inode_cachep);
2117 }
2118 
2119 struct workqueue_struct *nfsiod_workqueue;
2120 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2121 
2122 /*
2123  * start up the nfsiod workqueue
2124  */
2125 static int nfsiod_start(void)
2126 {
2127         struct workqueue_struct *wq;
2128         dprintk("RPC:       creating workqueue nfsiod\n");
2129         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2130         if (wq == NULL)
2131                 return -ENOMEM;
2132         nfsiod_workqueue = wq;
2133         return 0;
2134 }
2135 
2136 /*
2137  * Destroy the nfsiod workqueue
2138  */
2139 static void nfsiod_stop(void)
2140 {
2141         struct workqueue_struct *wq;
2142 
2143         wq = nfsiod_workqueue;
2144         if (wq == NULL)
2145                 return;
2146         nfsiod_workqueue = NULL;
2147         destroy_workqueue(wq);
2148 }
2149 
2150 unsigned int nfs_net_id;
2151 EXPORT_SYMBOL_GPL(nfs_net_id);
2152 
2153 static int nfs_net_init(struct net *net)
2154 {
2155         nfs_clients_init(net);
2156         return nfs_fs_proc_net_init(net);
2157 }
2158 
2159 static void nfs_net_exit(struct net *net)
2160 {
2161         struct nfs_net *nn = net_generic(net, nfs_net_id);
2162 
2163         nfs_fs_proc_net_exit(net);
2164         nfs_cleanup_cb_ident_idr(net);
2165         WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2166         WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
2167 }
2168 
2169 static struct pernet_operations nfs_net_ops = {
2170         .init = nfs_net_init,
2171         .exit = nfs_net_exit,
2172         .id   = &nfs_net_id,
2173         .size = sizeof(struct nfs_net),
2174 };
2175 
2176 /*
2177  * Initialize NFS
2178  */
2179 static int __init init_nfs_fs(void)
2180 {
2181         int err;
2182 
2183         err = register_pernet_subsys(&nfs_net_ops);
2184         if (err < 0)
2185                 goto out9;
2186 
2187         err = nfs_fscache_register();
2188         if (err < 0)
2189                 goto out8;
2190 
2191         err = nfsiod_start();
2192         if (err)
2193                 goto out7;
2194 
2195         err = nfs_fs_proc_init();
2196         if (err)
2197                 goto out6;
2198 
2199         err = nfs_init_nfspagecache();
2200         if (err)
2201                 goto out5;
2202 
2203         err = nfs_init_inodecache();
2204         if (err)
2205                 goto out4;
2206 
2207         err = nfs_init_readpagecache();
2208         if (err)
2209                 goto out3;
2210 
2211         err = nfs_init_writepagecache();
2212         if (err)
2213                 goto out2;
2214 
2215         err = nfs_init_directcache();
2216         if (err)
2217                 goto out1;
2218 
2219         rpc_proc_register(&init_net, &nfs_rpcstat);
2220 
2221         err = register_nfs_fs();
2222         if (err)
2223                 goto out0;
2224 
2225         return 0;
2226 out0:
2227         rpc_proc_unregister(&init_net, "nfs");
2228         nfs_destroy_directcache();
2229 out1:
2230         nfs_destroy_writepagecache();
2231 out2:
2232         nfs_destroy_readpagecache();
2233 out3:
2234         nfs_destroy_inodecache();
2235 out4:
2236         nfs_destroy_nfspagecache();
2237 out5:
2238         nfs_fs_proc_exit();
2239 out6:
2240         nfsiod_stop();
2241 out7:
2242         nfs_fscache_unregister();
2243 out8:
2244         unregister_pernet_subsys(&nfs_net_ops);
2245 out9:
2246         return err;
2247 }
2248 
2249 static void __exit exit_nfs_fs(void)
2250 {
2251         nfs_destroy_directcache();
2252         nfs_destroy_writepagecache();
2253         nfs_destroy_readpagecache();
2254         nfs_destroy_inodecache();
2255         nfs_destroy_nfspagecache();
2256         nfs_fscache_unregister();
2257         unregister_pernet_subsys(&nfs_net_ops);
2258         rpc_proc_unregister(&init_net, "nfs");
2259         unregister_nfs_fs();
2260         nfs_fs_proc_exit();
2261         nfsiod_stop();
2262 }
2263 
2264 /* Not quite true; I just maintain it */
2265 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2266 MODULE_LICENSE("GPL");
2267 module_param(enable_ino64, bool, 0644);
2268 
2269 module_init(init_nfs_fs)
2270 module_exit(exit_nfs_fs)
2271 

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