Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

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

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