Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/fs/nfs/inode.c

  1 /*
  2  *  linux/fs/nfs/inode.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  *
  6  *  nfs inode and superblock handling functions
  7  *
  8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 10  *
 11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 12  *  J.S.Peatfield@damtp.cam.ac.uk
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/init.h>
 18 #include <linux/sched.h>
 19 #include <linux/time.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/string.h>
 23 #include <linux/stat.h>
 24 #include <linux/errno.h>
 25 #include <linux/unistd.h>
 26 #include <linux/sunrpc/clnt.h>
 27 #include <linux/sunrpc/stats.h>
 28 #include <linux/sunrpc/metrics.h>
 29 #include <linux/nfs_fs.h>
 30 #include <linux/nfs_mount.h>
 31 #include <linux/nfs4_mount.h>
 32 #include <linux/lockd/bind.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/mount.h>
 35 #include <linux/vfs.h>
 36 #include <linux/inet.h>
 37 #include <linux/nfs_xdr.h>
 38 #include <linux/slab.h>
 39 #include <linux/compat.h>
 40 #include <linux/freezer.h>
 41 
 42 #include <asm/uaccess.h>
 43 
 44 #include "nfs4_fs.h"
 45 #include "callback.h"
 46 #include "delegation.h"
 47 #include "iostat.h"
 48 #include "internal.h"
 49 #include "fscache.h"
 50 #include "pnfs.h"
 51 #include "nfs.h"
 52 #include "netns.h"
 53 
 54 #include "nfstrace.h"
 55 
 56 #define NFSDBG_FACILITY         NFSDBG_VFS
 57 
 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
 59 
 60 /* Default is to see 64-bit inode numbers */
 61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
 62 
 63 static void nfs_invalidate_inode(struct inode *);
 64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
 65 
 66 static struct kmem_cache * nfs_inode_cachep;
 67 
 68 static inline unsigned long
 69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
 70 {
 71         return nfs_fileid_to_ino_t(fattr->fileid);
 72 }
 73 
 74 /**
 75  * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
 76  * @word: long word containing the bit lock
 77  */
 78 int nfs_wait_bit_killable(void *word)
 79 {
 80         if (fatal_signal_pending(current))
 81                 return -ERESTARTSYS;
 82         freezable_schedule_unsafe();
 83         return 0;
 84 }
 85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
 86 
 87 /**
 88  * nfs_compat_user_ino64 - returns the user-visible inode number
 89  * @fileid: 64-bit fileid
 90  *
 91  * This function returns a 32-bit inode number if the boot parameter
 92  * nfs.enable_ino64 is zero.
 93  */
 94 u64 nfs_compat_user_ino64(u64 fileid)
 95 {
 96 #ifdef CONFIG_COMPAT
 97         compat_ulong_t ino;
 98 #else   
 99         unsigned long ino;
100 #endif
101 
102         if (enable_ino64)
103                 return fileid;
104         ino = fileid;
105         if (sizeof(ino) < sizeof(fileid))
106                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107         return ino;
108 }
109 
110 int nfs_drop_inode(struct inode *inode)
111 {
112         return NFS_STALE(inode) || generic_drop_inode(inode);
113 }
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
115 
116 void nfs_clear_inode(struct inode *inode)
117 {
118         /*
119          * The following should never happen...
120          */
121         WARN_ON_ONCE(nfs_have_writebacks(inode));
122         WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123         nfs_zap_acl_cache(inode);
124         nfs_access_zap_cache(inode);
125         nfs_fscache_clear_inode(inode);
126 }
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
128 
129 void nfs_evict_inode(struct inode *inode)
130 {
131         truncate_inode_pages_final(&inode->i_data);
132         clear_inode(inode);
133         nfs_clear_inode(inode);
134 }
135 
136 /**
137  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138  */
139 int nfs_sync_mapping(struct address_space *mapping)
140 {
141         int ret = 0;
142 
143         if (mapping->nrpages != 0) {
144                 unmap_mapping_range(mapping, 0, 0, 0);
145                 ret = nfs_wb_all(mapping->host);
146         }
147         return ret;
148 }
149 
150 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
151 {
152         struct nfs_inode *nfsi = NFS_I(inode);
153 
154         if (inode->i_mapping->nrpages == 0)
155                 flags &= ~NFS_INO_INVALID_DATA;
156         nfsi->cache_validity |= flags;
157         if (flags & NFS_INO_INVALID_DATA)
158                 nfs_fscache_invalidate(inode);
159 }
160 
161 /*
162  * Invalidate the local caches
163  */
164 static void nfs_zap_caches_locked(struct inode *inode)
165 {
166         struct nfs_inode *nfsi = NFS_I(inode);
167         int mode = inode->i_mode;
168 
169         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
170 
171         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
172         nfsi->attrtimeo_timestamp = jiffies;
173 
174         memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
175         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
176                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
177                                         | NFS_INO_INVALID_DATA
178                                         | NFS_INO_INVALID_ACCESS
179                                         | NFS_INO_INVALID_ACL
180                                         | NFS_INO_REVAL_PAGECACHE);
181         } else
182                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
183                                         | NFS_INO_INVALID_ACCESS
184                                         | NFS_INO_INVALID_ACL
185                                         | NFS_INO_REVAL_PAGECACHE);
186         nfs_zap_label_cache_locked(nfsi);
187 }
188 
189 void nfs_zap_caches(struct inode *inode)
190 {
191         spin_lock(&inode->i_lock);
192         nfs_zap_caches_locked(inode);
193         spin_unlock(&inode->i_lock);
194 }
195 
196 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
197 {
198         if (mapping->nrpages != 0) {
199                 spin_lock(&inode->i_lock);
200                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
201                 spin_unlock(&inode->i_lock);
202         }
203 }
204 
205 void nfs_zap_acl_cache(struct inode *inode)
206 {
207         void (*clear_acl_cache)(struct inode *);
208 
209         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
210         if (clear_acl_cache != NULL)
211                 clear_acl_cache(inode);
212         spin_lock(&inode->i_lock);
213         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
214         spin_unlock(&inode->i_lock);
215 }
216 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
217 
218 void nfs_invalidate_atime(struct inode *inode)
219 {
220         spin_lock(&inode->i_lock);
221         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
222         spin_unlock(&inode->i_lock);
223 }
224 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
225 
226 /*
227  * Invalidate, but do not unhash, the inode.
228  * NB: must be called with inode->i_lock held!
229  */
230 static void nfs_invalidate_inode(struct inode *inode)
231 {
232         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
233         nfs_zap_caches_locked(inode);
234 }
235 
236 struct nfs_find_desc {
237         struct nfs_fh           *fh;
238         struct nfs_fattr        *fattr;
239 };
240 
241 /*
242  * In NFSv3 we can have 64bit inode numbers. In order to support
243  * this, and re-exported directories (also seen in NFSv2)
244  * we are forced to allow 2 different inodes to have the same
245  * i_ino.
246  */
247 static int
248 nfs_find_actor(struct inode *inode, void *opaque)
249 {
250         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
251         struct nfs_fh           *fh = desc->fh;
252         struct nfs_fattr        *fattr = desc->fattr;
253 
254         if (NFS_FILEID(inode) != fattr->fileid)
255                 return 0;
256         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
257                 return 0;
258         if (nfs_compare_fh(NFS_FH(inode), fh))
259                 return 0;
260         if (is_bad_inode(inode) || NFS_STALE(inode))
261                 return 0;
262         return 1;
263 }
264 
265 static int
266 nfs_init_locked(struct inode *inode, void *opaque)
267 {
268         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
269         struct nfs_fattr        *fattr = desc->fattr;
270 
271         set_nfs_fileid(inode, fattr->fileid);
272         nfs_copy_fh(NFS_FH(inode), desc->fh);
273         return 0;
274 }
275 
276 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
277 static void nfs_clear_label_invalid(struct inode *inode)
278 {
279         spin_lock(&inode->i_lock);
280         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
281         spin_unlock(&inode->i_lock);
282 }
283 
284 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
285                                         struct nfs4_label *label)
286 {
287         int error;
288 
289         if (label == NULL)
290                 return;
291 
292         if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
293                 error = security_inode_notifysecctx(inode, label->label,
294                                 label->len);
295                 if (error)
296                         printk(KERN_ERR "%s() %s %d "
297                                         "security_inode_notifysecctx() %d\n",
298                                         __func__,
299                                         (char *)label->label,
300                                         label->len, error);
301                 nfs_clear_label_invalid(inode);
302         }
303 }
304 
305 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
306 {
307         struct nfs4_label *label = NULL;
308         int minor_version = server->nfs_client->cl_minorversion;
309 
310         if (minor_version < 2)
311                 return label;
312 
313         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
314                 return label;
315 
316         label = kzalloc(sizeof(struct nfs4_label), flags);
317         if (label == NULL)
318                 return ERR_PTR(-ENOMEM);
319 
320         label->label = kzalloc(NFS4_MAXLABELLEN, flags);
321         if (label->label == NULL) {
322                 kfree(label);
323                 return ERR_PTR(-ENOMEM);
324         }
325         label->len = NFS4_MAXLABELLEN;
326 
327         return label;
328 }
329 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
330 #else
331 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
332                                         struct nfs4_label *label)
333 {
334 }
335 #endif
336 EXPORT_SYMBOL_GPL(nfs_setsecurity);
337 
338 /*
339  * This is our front-end to iget that looks up inodes by file handle
340  * instead of inode number.
341  */
342 struct inode *
343 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
344 {
345         struct nfs_find_desc desc = {
346                 .fh     = fh,
347                 .fattr  = fattr
348         };
349         struct inode *inode = ERR_PTR(-ENOENT);
350         unsigned long hash;
351 
352         nfs_attr_check_mountpoint(sb, fattr);
353 
354         if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
355             !nfs_attr_use_mounted_on_fileid(fattr))
356                 goto out_no_inode;
357         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
358                 goto out_no_inode;
359 
360         hash = nfs_fattr_to_ino_t(fattr);
361 
362         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
363         if (inode == NULL) {
364                 inode = ERR_PTR(-ENOMEM);
365                 goto out_no_inode;
366         }
367 
368         if (inode->i_state & I_NEW) {
369                 struct nfs_inode *nfsi = NFS_I(inode);
370                 unsigned long now = jiffies;
371 
372                 /* We set i_ino for the few things that still rely on it,
373                  * such as stat(2) */
374                 inode->i_ino = hash;
375 
376                 /* We can't support update_atime(), since the server will reset it */
377                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
378                 inode->i_mode = fattr->mode;
379                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
380                                 && nfs_server_capable(inode, NFS_CAP_MODE))
381                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
382                 /* Why so? Because we want revalidate for devices/FIFOs, and
383                  * that's precisely what we have in nfs_file_inode_operations.
384                  */
385                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
386                 if (S_ISREG(inode->i_mode)) {
387                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
388                         inode->i_data.a_ops = &nfs_file_aops;
389                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
390                 } else if (S_ISDIR(inode->i_mode)) {
391                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
392                         inode->i_fop = &nfs_dir_operations;
393                         inode->i_data.a_ops = &nfs_dir_aops;
394                         /* Deal with crossing mountpoints */
395                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
396                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
397                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
398                                         inode->i_op = &nfs_referral_inode_operations;
399                                 else
400                                         inode->i_op = &nfs_mountpoint_inode_operations;
401                                 inode->i_fop = NULL;
402                                 inode->i_flags |= S_AUTOMOUNT;
403                         }
404                 } else if (S_ISLNK(inode->i_mode))
405                         inode->i_op = &nfs_symlink_inode_operations;
406                 else
407                         init_special_inode(inode, inode->i_mode, fattr->rdev);
408 
409                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
410                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
411                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
412                 inode->i_version = 0;
413                 inode->i_size = 0;
414                 clear_nlink(inode);
415                 inode->i_uid = make_kuid(&init_user_ns, -2);
416                 inode->i_gid = make_kgid(&init_user_ns, -2);
417                 inode->i_blocks = 0;
418                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
419                 nfsi->write_io = 0;
420                 nfsi->read_io = 0;
421 
422                 nfsi->read_cache_jiffies = fattr->time_start;
423                 nfsi->attr_gencount = fattr->gencount;
424                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
425                         inode->i_atime = fattr->atime;
426                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
427                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
428                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
429                         inode->i_mtime = fattr->mtime;
430                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
431                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
432                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
433                         inode->i_ctime = fattr->ctime;
434                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
435                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
436                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
437                         inode->i_version = fattr->change_attr;
438                 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
439                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
440                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
441                         inode->i_size = nfs_size_to_loff_t(fattr->size);
442                 else
443                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
444                                 | NFS_INO_REVAL_PAGECACHE);
445                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
446                         set_nlink(inode, fattr->nlink);
447                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
448                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
449                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
450                         inode->i_uid = fattr->uid;
451                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
452                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
453                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
454                         inode->i_gid = fattr->gid;
455                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
456                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
457                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
458                         inode->i_blocks = fattr->du.nfs2.blocks;
459                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
460                         /*
461                          * report the blocks in 512byte units
462                          */
463                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
464                 }
465 
466                 nfs_setsecurity(inode, fattr, label);
467 
468                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
469                 nfsi->attrtimeo_timestamp = now;
470                 nfsi->access_cache = RB_ROOT;
471 
472                 nfs_fscache_init_inode(inode);
473 
474                 unlock_new_inode(inode);
475         } else
476                 nfs_refresh_inode(inode, fattr);
477         dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
478                 inode->i_sb->s_id,
479                 (unsigned long long)NFS_FILEID(inode),
480                 nfs_display_fhandle_hash(fh),
481                 atomic_read(&inode->i_count));
482 
483 out:
484         return inode;
485 
486 out_no_inode:
487         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
488         goto out;
489 }
490 EXPORT_SYMBOL_GPL(nfs_fhget);
491 
492 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
493 
494 int
495 nfs_setattr(struct dentry *dentry, struct iattr *attr)
496 {
497         struct inode *inode = dentry->d_inode;
498         struct nfs_fattr *fattr;
499         int error = -ENOMEM;
500 
501         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
502 
503         /* skip mode change if it's just for clearing setuid/setgid */
504         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
505                 attr->ia_valid &= ~ATTR_MODE;
506 
507         if (attr->ia_valid & ATTR_SIZE) {
508                 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
509                         attr->ia_valid &= ~ATTR_SIZE;
510         }
511 
512         /* Optimization: if the end result is no change, don't RPC */
513         attr->ia_valid &= NFS_VALID_ATTRS;
514         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
515                 return 0;
516 
517         trace_nfs_setattr_enter(inode);
518 
519         /* Write all dirty data */
520         if (S_ISREG(inode->i_mode)) {
521                 nfs_inode_dio_wait(inode);
522                 nfs_wb_all(inode);
523         }
524 
525         fattr = nfs_alloc_fattr();
526         if (fattr == NULL)
527                 goto out;
528         /*
529          * Return any delegations if we're going to change ACLs
530          */
531         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
532                 NFS_PROTO(inode)->return_delegation(inode);
533         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
534         if (error == 0)
535                 error = nfs_refresh_inode(inode, fattr);
536         nfs_free_fattr(fattr);
537 out:
538         trace_nfs_setattr_exit(inode, error);
539         return error;
540 }
541 EXPORT_SYMBOL_GPL(nfs_setattr);
542 
543 /**
544  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
545  * @inode: inode of the file used
546  * @offset: file offset to start truncating
547  *
548  * This is a copy of the common vmtruncate, but with the locking
549  * corrected to take into account the fact that NFS requires
550  * inode->i_size to be updated under the inode->i_lock.
551  */
552 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
553 {
554         int err;
555 
556         err = inode_newsize_ok(inode, offset);
557         if (err)
558                 goto out;
559 
560         spin_lock(&inode->i_lock);
561         i_size_write(inode, offset);
562         /* Optimisation */
563         if (offset == 0)
564                 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
565         spin_unlock(&inode->i_lock);
566 
567         truncate_pagecache(inode, offset);
568 out:
569         return err;
570 }
571 
572 /**
573  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
574  * @inode: pointer to struct inode
575  * @attr: pointer to struct iattr
576  *
577  * Note: we do this in the *proc.c in order to ensure that
578  *       it works for things like exclusive creates too.
579  */
580 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
581 {
582         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
583                 spin_lock(&inode->i_lock);
584                 if ((attr->ia_valid & ATTR_MODE) != 0) {
585                         int mode = attr->ia_mode & S_IALLUGO;
586                         mode |= inode->i_mode & ~S_IALLUGO;
587                         inode->i_mode = mode;
588                 }
589                 if ((attr->ia_valid & ATTR_UID) != 0)
590                         inode->i_uid = attr->ia_uid;
591                 if ((attr->ia_valid & ATTR_GID) != 0)
592                         inode->i_gid = attr->ia_gid;
593                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
594                                 | NFS_INO_INVALID_ACL);
595                 spin_unlock(&inode->i_lock);
596         }
597         if ((attr->ia_valid & ATTR_SIZE) != 0) {
598                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
599                 nfs_vmtruncate(inode, attr->ia_size);
600         }
601 }
602 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
603 
604 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
605 {
606         struct dentry *parent;
607 
608         parent = dget_parent(dentry);
609         nfs_force_use_readdirplus(parent->d_inode);
610         dput(parent);
611 }
612 
613 static bool nfs_need_revalidate_inode(struct inode *inode)
614 {
615         if (NFS_I(inode)->cache_validity &
616                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
617                 return true;
618         if (nfs_attribute_cache_expired(inode))
619                 return true;
620         return false;
621 }
622 
623 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
624 {
625         struct inode *inode = dentry->d_inode;
626         int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
627         int err;
628 
629         trace_nfs_getattr_enter(inode);
630         /* Flush out writes to the server in order to update c/mtime.  */
631         if (S_ISREG(inode->i_mode)) {
632                 nfs_inode_dio_wait(inode);
633                 err = filemap_write_and_wait(inode->i_mapping);
634                 if (err)
635                         goto out;
636         }
637 
638         /*
639          * We may force a getattr if the user cares about atime.
640          *
641          * Note that we only have to check the vfsmount flags here:
642          *  - NFS always sets S_NOATIME by so checking it would give a
643          *    bogus result
644          *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
645          *    no point in checking those.
646          */
647         if ((mnt->mnt_flags & MNT_NOATIME) ||
648             ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
649                 need_atime = 0;
650 
651         if (need_atime || nfs_need_revalidate_inode(inode)) {
652                 struct nfs_server *server = NFS_SERVER(inode);
653 
654                 if (server->caps & NFS_CAP_READDIRPLUS)
655                         nfs_request_parent_use_readdirplus(dentry);
656                 err = __nfs_revalidate_inode(server, inode);
657         }
658         if (!err) {
659                 generic_fillattr(inode, stat);
660                 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
661         }
662 out:
663         trace_nfs_getattr_exit(inode, err);
664         return err;
665 }
666 EXPORT_SYMBOL_GPL(nfs_getattr);
667 
668 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
669 {
670         atomic_set(&l_ctx->count, 1);
671         l_ctx->lockowner.l_owner = current->files;
672         l_ctx->lockowner.l_pid = current->tgid;
673         INIT_LIST_HEAD(&l_ctx->list);
674         nfs_iocounter_init(&l_ctx->io_count);
675 }
676 
677 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
678 {
679         struct nfs_lock_context *head = &ctx->lock_context;
680         struct nfs_lock_context *pos = head;
681 
682         do {
683                 if (pos->lockowner.l_owner != current->files)
684                         continue;
685                 if (pos->lockowner.l_pid != current->tgid)
686                         continue;
687                 atomic_inc(&pos->count);
688                 return pos;
689         } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
690         return NULL;
691 }
692 
693 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
694 {
695         struct nfs_lock_context *res, *new = NULL;
696         struct inode *inode = ctx->dentry->d_inode;
697 
698         spin_lock(&inode->i_lock);
699         res = __nfs_find_lock_context(ctx);
700         if (res == NULL) {
701                 spin_unlock(&inode->i_lock);
702                 new = kmalloc(sizeof(*new), GFP_KERNEL);
703                 if (new == NULL)
704                         return ERR_PTR(-ENOMEM);
705                 nfs_init_lock_context(new);
706                 spin_lock(&inode->i_lock);
707                 res = __nfs_find_lock_context(ctx);
708                 if (res == NULL) {
709                         list_add_tail(&new->list, &ctx->lock_context.list);
710                         new->open_context = ctx;
711                         res = new;
712                         new = NULL;
713                 }
714         }
715         spin_unlock(&inode->i_lock);
716         kfree(new);
717         return res;
718 }
719 
720 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
721 {
722         struct nfs_open_context *ctx = l_ctx->open_context;
723         struct inode *inode = ctx->dentry->d_inode;
724 
725         if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
726                 return;
727         list_del(&l_ctx->list);
728         spin_unlock(&inode->i_lock);
729         kfree(l_ctx);
730 }
731 
732 /**
733  * nfs_close_context - Common close_context() routine NFSv2/v3
734  * @ctx: pointer to context
735  * @is_sync: is this a synchronous close
736  *
737  * always ensure that the attributes are up to date if we're mounted
738  * with close-to-open semantics
739  */
740 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
741 {
742         struct inode *inode;
743         struct nfs_server *server;
744 
745         if (!(ctx->mode & FMODE_WRITE))
746                 return;
747         if (!is_sync)
748                 return;
749         inode = ctx->dentry->d_inode;
750         if (!list_empty(&NFS_I(inode)->open_files))
751                 return;
752         server = NFS_SERVER(inode);
753         if (server->flags & NFS_MOUNT_NOCTO)
754                 return;
755         nfs_revalidate_inode(server, inode);
756 }
757 EXPORT_SYMBOL_GPL(nfs_close_context);
758 
759 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
760 {
761         struct nfs_open_context *ctx;
762         struct rpc_cred *cred = rpc_lookup_cred();
763         if (IS_ERR(cred))
764                 return ERR_CAST(cred);
765 
766         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
767         if (!ctx) {
768                 put_rpccred(cred);
769                 return ERR_PTR(-ENOMEM);
770         }
771         nfs_sb_active(dentry->d_sb);
772         ctx->dentry = dget(dentry);
773         ctx->cred = cred;
774         ctx->state = NULL;
775         ctx->mode = f_mode;
776         ctx->flags = 0;
777         ctx->error = 0;
778         nfs_init_lock_context(&ctx->lock_context);
779         ctx->lock_context.open_context = ctx;
780         INIT_LIST_HEAD(&ctx->list);
781         ctx->mdsthreshold = NULL;
782         return ctx;
783 }
784 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
785 
786 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
787 {
788         if (ctx != NULL)
789                 atomic_inc(&ctx->lock_context.count);
790         return ctx;
791 }
792 EXPORT_SYMBOL_GPL(get_nfs_open_context);
793 
794 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
795 {
796         struct inode *inode = ctx->dentry->d_inode;
797         struct super_block *sb = ctx->dentry->d_sb;
798 
799         if (!list_empty(&ctx->list)) {
800                 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
801                         return;
802                 list_del(&ctx->list);
803                 spin_unlock(&inode->i_lock);
804         } else if (!atomic_dec_and_test(&ctx->lock_context.count))
805                 return;
806         if (inode != NULL)
807                 NFS_PROTO(inode)->close_context(ctx, is_sync);
808         if (ctx->cred != NULL)
809                 put_rpccred(ctx->cred);
810         dput(ctx->dentry);
811         nfs_sb_deactive(sb);
812         kfree(ctx->mdsthreshold);
813         kfree(ctx);
814 }
815 
816 void put_nfs_open_context(struct nfs_open_context *ctx)
817 {
818         __put_nfs_open_context(ctx, 0);
819 }
820 EXPORT_SYMBOL_GPL(put_nfs_open_context);
821 
822 /*
823  * Ensure that mmap has a recent RPC credential for use when writing out
824  * shared pages
825  */
826 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
827 {
828         struct inode *inode = ctx->dentry->d_inode;
829         struct nfs_inode *nfsi = NFS_I(inode);
830 
831         spin_lock(&inode->i_lock);
832         list_add(&ctx->list, &nfsi->open_files);
833         spin_unlock(&inode->i_lock);
834 }
835 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
836 
837 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
838 {
839         filp->private_data = get_nfs_open_context(ctx);
840         if (list_empty(&ctx->list))
841                 nfs_inode_attach_open_context(ctx);
842 }
843 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
844 
845 /*
846  * Given an inode, search for an open context with the desired characteristics
847  */
848 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
849 {
850         struct nfs_inode *nfsi = NFS_I(inode);
851         struct nfs_open_context *pos, *ctx = NULL;
852 
853         spin_lock(&inode->i_lock);
854         list_for_each_entry(pos, &nfsi->open_files, list) {
855                 if (cred != NULL && pos->cred != cred)
856                         continue;
857                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
858                         continue;
859                 ctx = get_nfs_open_context(pos);
860                 break;
861         }
862         spin_unlock(&inode->i_lock);
863         return ctx;
864 }
865 
866 static void nfs_file_clear_open_context(struct file *filp)
867 {
868         struct nfs_open_context *ctx = nfs_file_open_context(filp);
869 
870         if (ctx) {
871                 struct inode *inode = ctx->dentry->d_inode;
872 
873                 filp->private_data = NULL;
874                 spin_lock(&inode->i_lock);
875                 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
876                 spin_unlock(&inode->i_lock);
877                 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
878         }
879 }
880 
881 /*
882  * These allocate and release file read/write context information.
883  */
884 int nfs_open(struct inode *inode, struct file *filp)
885 {
886         struct nfs_open_context *ctx;
887 
888         ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
889         if (IS_ERR(ctx))
890                 return PTR_ERR(ctx);
891         nfs_file_set_open_context(filp, ctx);
892         put_nfs_open_context(ctx);
893         nfs_fscache_open_file(inode, filp);
894         return 0;
895 }
896 
897 int nfs_release(struct inode *inode, struct file *filp)
898 {
899         nfs_file_clear_open_context(filp);
900         return 0;
901 }
902 
903 /*
904  * This function is called whenever some part of NFS notices that
905  * the cached attributes have to be refreshed.
906  */
907 int
908 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
909 {
910         int              status = -ESTALE;
911         struct nfs4_label *label = NULL;
912         struct nfs_fattr *fattr = NULL;
913         struct nfs_inode *nfsi = NFS_I(inode);
914 
915         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
916                 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
917 
918         trace_nfs_revalidate_inode_enter(inode);
919 
920         if (is_bad_inode(inode))
921                 goto out;
922         if (NFS_STALE(inode))
923                 goto out;
924 
925         status = -ENOMEM;
926         fattr = nfs_alloc_fattr();
927         if (fattr == NULL)
928                 goto out;
929 
930         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
931 
932         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
933         if (IS_ERR(label)) {
934                 status = PTR_ERR(label);
935                 goto out;
936         }
937 
938         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
939         if (status != 0) {
940                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
941                          inode->i_sb->s_id,
942                          (unsigned long long)NFS_FILEID(inode), status);
943                 if (status == -ESTALE) {
944                         nfs_zap_caches(inode);
945                         if (!S_ISDIR(inode->i_mode))
946                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
947                 }
948                 goto err_out;
949         }
950 
951         status = nfs_refresh_inode(inode, fattr);
952         if (status) {
953                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
954                          inode->i_sb->s_id,
955                          (unsigned long long)NFS_FILEID(inode), status);
956                 goto err_out;
957         }
958 
959         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
960                 nfs_zap_acl_cache(inode);
961 
962         nfs_setsecurity(inode, fattr, label);
963 
964         dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
965                 inode->i_sb->s_id,
966                 (unsigned long long)NFS_FILEID(inode));
967 
968 err_out:
969         nfs4_label_free(label);
970 out:
971         nfs_free_fattr(fattr);
972         trace_nfs_revalidate_inode_exit(inode, status);
973         return status;
974 }
975 
976 int nfs_attribute_timeout(struct inode *inode)
977 {
978         struct nfs_inode *nfsi = NFS_I(inode);
979 
980         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
981 }
982 
983 int nfs_attribute_cache_expired(struct inode *inode)
984 {
985         if (nfs_have_delegated_attributes(inode))
986                 return 0;
987         return nfs_attribute_timeout(inode);
988 }
989 
990 /**
991  * nfs_revalidate_inode - Revalidate the inode attributes
992  * @server - pointer to nfs_server struct
993  * @inode - pointer to inode struct
994  *
995  * Updates inode attribute information by retrieving the data from the server.
996  */
997 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
998 {
999         if (!nfs_need_revalidate_inode(inode))
1000                 return NFS_STALE(inode) ? -ESTALE : 0;
1001         return __nfs_revalidate_inode(server, inode);
1002 }
1003 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1004 
1005 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1006 {
1007         struct nfs_inode *nfsi = NFS_I(inode);
1008         int ret;
1009 
1010         if (mapping->nrpages != 0) {
1011                 if (S_ISREG(inode->i_mode)) {
1012                         ret = nfs_sync_mapping(mapping);
1013                         if (ret < 0)
1014                                 return ret;
1015                 }
1016                 ret = invalidate_inode_pages2(mapping);
1017                 if (ret < 0)
1018                         return ret;
1019         }
1020         if (S_ISDIR(inode->i_mode)) {
1021                 spin_lock(&inode->i_lock);
1022                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1023                 spin_unlock(&inode->i_lock);
1024         }
1025         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1026         nfs_fscache_wait_on_invalidate(inode);
1027 
1028         dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1029                         inode->i_sb->s_id,
1030                         (unsigned long long)NFS_FILEID(inode));
1031         return 0;
1032 }
1033 
1034 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1035 {
1036         if (nfs_have_delegated_attributes(inode))
1037                 return false;
1038         return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1039                 || nfs_attribute_timeout(inode)
1040                 || NFS_STALE(inode);
1041 }
1042 
1043 /**
1044  * nfs_revalidate_mapping - Revalidate the pagecache
1045  * @inode - pointer to host inode
1046  * @mapping - pointer to mapping
1047  */
1048 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1049 {
1050         struct nfs_inode *nfsi = NFS_I(inode);
1051         unsigned long *bitlock = &nfsi->flags;
1052         int ret = 0;
1053 
1054         /* swapfiles are not supposed to be shared. */
1055         if (IS_SWAPFILE(inode))
1056                 goto out;
1057 
1058         if (nfs_mapping_need_revalidate_inode(inode)) {
1059                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1060                 if (ret < 0)
1061                         goto out;
1062         }
1063 
1064         /*
1065          * We must clear NFS_INO_INVALID_DATA first to ensure that
1066          * invalidations that come in while we're shooting down the mappings
1067          * are respected. But, that leaves a race window where one revalidator
1068          * can clear the flag, and then another checks it before the mapping
1069          * gets invalidated. Fix that by serializing access to this part of
1070          * the function.
1071          *
1072          * At the same time, we need to allow other tasks to see whether we
1073          * might be in the middle of invalidating the pages, so we only set
1074          * the bit lock here if it looks like we're going to be doing that.
1075          */
1076         for (;;) {
1077                 ret = wait_on_bit(bitlock, NFS_INO_INVALIDATING,
1078                                   nfs_wait_bit_killable, TASK_KILLABLE);
1079                 if (ret)
1080                         goto out;
1081                 spin_lock(&inode->i_lock);
1082                 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1083                         spin_unlock(&inode->i_lock);
1084                         continue;
1085                 }
1086                 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1087                         break;
1088                 spin_unlock(&inode->i_lock);
1089                 goto out;
1090         }
1091 
1092         set_bit(NFS_INO_INVALIDATING, bitlock);
1093         smp_wmb();
1094         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1095         spin_unlock(&inode->i_lock);
1096         trace_nfs_invalidate_mapping_enter(inode);
1097         ret = nfs_invalidate_mapping(inode, mapping);
1098         trace_nfs_invalidate_mapping_exit(inode, ret);
1099 
1100         clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1101         smp_mb__after_atomic();
1102         wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1103 out:
1104         return ret;
1105 }
1106 
1107 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1108 {
1109         struct nfs_inode *nfsi = NFS_I(inode);
1110         unsigned long ret = 0;
1111 
1112         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1113                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1114                         && inode->i_version == fattr->pre_change_attr) {
1115                 inode->i_version = fattr->change_attr;
1116                 if (S_ISDIR(inode->i_mode))
1117                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1118                 ret |= NFS_INO_INVALID_ATTR;
1119         }
1120         /* If we have atomic WCC data, we may update some attributes */
1121         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1122                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1123                         && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1124                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1125                 ret |= NFS_INO_INVALID_ATTR;
1126         }
1127 
1128         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1129                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1130                         && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1131                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1132                 if (S_ISDIR(inode->i_mode))
1133                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1134                 ret |= NFS_INO_INVALID_ATTR;
1135         }
1136         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1137                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1138                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1139                         && nfsi->npages == 0) {
1140                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1141                 ret |= NFS_INO_INVALID_ATTR;
1142         }
1143 
1144         return ret;
1145 }
1146 
1147 /**
1148  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1149  * @inode - pointer to inode
1150  * @fattr - updated attributes
1151  *
1152  * Verifies the attribute cache. If we have just changed the attributes,
1153  * so that fattr carries weak cache consistency data, then it may
1154  * also update the ctime/mtime/change_attribute.
1155  */
1156 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1157 {
1158         struct nfs_inode *nfsi = NFS_I(inode);
1159         loff_t cur_size, new_isize;
1160         unsigned long invalid = 0;
1161 
1162 
1163         if (nfs_have_delegated_attributes(inode))
1164                 return 0;
1165         /* Has the inode gone and changed behind our back? */
1166         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1167                 return -EIO;
1168         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1169                 return -EIO;
1170 
1171         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1172                         inode->i_version != fattr->change_attr)
1173                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1174 
1175         /* Verify a few of the more important attributes */
1176         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1177                 invalid |= NFS_INO_INVALID_ATTR;
1178 
1179         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1180                 cur_size = i_size_read(inode);
1181                 new_isize = nfs_size_to_loff_t(fattr->size);
1182                 if (cur_size != new_isize && nfsi->npages == 0)
1183                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1184         }
1185 
1186         /* Have any file permissions changed? */
1187         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1188                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1189         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1190                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1191         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1192                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1193 
1194         /* Has the link count changed? */
1195         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1196                 invalid |= NFS_INO_INVALID_ATTR;
1197 
1198         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1199                 invalid |= NFS_INO_INVALID_ATIME;
1200 
1201         if (invalid != 0)
1202                 nfs_set_cache_invalid(inode, invalid);
1203 
1204         nfsi->read_cache_jiffies = fattr->time_start;
1205         return 0;
1206 }
1207 
1208 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1209 {
1210         if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1211                 return 0;
1212         return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1213 }
1214 
1215 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1216 {
1217         if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1218                 return 0;
1219         return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1220 }
1221 
1222 static atomic_long_t nfs_attr_generation_counter;
1223 
1224 static unsigned long nfs_read_attr_generation_counter(void)
1225 {
1226         return atomic_long_read(&nfs_attr_generation_counter);
1227 }
1228 
1229 unsigned long nfs_inc_attr_generation_counter(void)
1230 {
1231         return atomic_long_inc_return(&nfs_attr_generation_counter);
1232 }
1233 
1234 void nfs_fattr_init(struct nfs_fattr *fattr)
1235 {
1236         fattr->valid = 0;
1237         fattr->time_start = jiffies;
1238         fattr->gencount = nfs_inc_attr_generation_counter();
1239         fattr->owner_name = NULL;
1240         fattr->group_name = NULL;
1241 }
1242 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1243 
1244 struct nfs_fattr *nfs_alloc_fattr(void)
1245 {
1246         struct nfs_fattr *fattr;
1247 
1248         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1249         if (fattr != NULL)
1250                 nfs_fattr_init(fattr);
1251         return fattr;
1252 }
1253 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1254 
1255 struct nfs_fh *nfs_alloc_fhandle(void)
1256 {
1257         struct nfs_fh *fh;
1258 
1259         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1260         if (fh != NULL)
1261                 fh->size = 0;
1262         return fh;
1263 }
1264 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1265 
1266 #ifdef NFS_DEBUG
1267 /*
1268  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1269  *                             in the same way that wireshark does
1270  *
1271  * @fh: file handle
1272  *
1273  * For debugging only.
1274  */
1275 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1276 {
1277         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1278          * not on the result */
1279         return nfs_fhandle_hash(fh);
1280 }
1281 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1282 
1283 /*
1284  * _nfs_display_fhandle - display an NFS file handle on the console
1285  *
1286  * @fh: file handle to display
1287  * @caption: display caption
1288  *
1289  * For debugging only.
1290  */
1291 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1292 {
1293         unsigned short i;
1294 
1295         if (fh == NULL || fh->size == 0) {
1296                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1297                 return;
1298         }
1299 
1300         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1301                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1302         for (i = 0; i < fh->size; i += 16) {
1303                 __be32 *pos = (__be32 *)&fh->data[i];
1304 
1305                 switch ((fh->size - i - 1) >> 2) {
1306                 case 0:
1307                         printk(KERN_DEFAULT " %08x\n",
1308                                 be32_to_cpup(pos));
1309                         break;
1310                 case 1:
1311                         printk(KERN_DEFAULT " %08x %08x\n",
1312                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1313                         break;
1314                 case 2:
1315                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1316                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1317                                 be32_to_cpup(pos + 2));
1318                         break;
1319                 default:
1320                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1321                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1322                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1323                 }
1324         }
1325 }
1326 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1327 #endif
1328 
1329 /**
1330  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1331  * @inode - pointer to inode
1332  * @fattr - attributes
1333  *
1334  * Attempt to divine whether or not an RPC call reply carrying stale
1335  * attributes got scheduled after another call carrying updated ones.
1336  *
1337  * To do so, the function first assumes that a more recent ctime means
1338  * that the attributes in fattr are newer, however it also attempt to
1339  * catch the case where ctime either didn't change, or went backwards
1340  * (if someone reset the clock on the server) by looking at whether
1341  * or not this RPC call was started after the inode was last updated.
1342  * Note also the check for wraparound of 'attr_gencount'
1343  *
1344  * The function returns 'true' if it thinks the attributes in 'fattr' are
1345  * more recent than the ones cached in the inode.
1346  *
1347  */
1348 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1349 {
1350         const struct nfs_inode *nfsi = NFS_I(inode);
1351 
1352         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1353                 nfs_ctime_need_update(inode, fattr) ||
1354                 nfs_size_need_update(inode, fattr) ||
1355                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1356 }
1357 
1358 /*
1359  * Don't trust the change_attribute, mtime, ctime or size if
1360  * a pnfs LAYOUTCOMMIT is outstanding
1361  */
1362 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1363                 struct nfs_fattr *fattr)
1364 {
1365         if (pnfs_layoutcommit_outstanding(inode))
1366                 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1367                                 NFS_ATTR_FATTR_MTIME |
1368                                 NFS_ATTR_FATTR_CTIME |
1369                                 NFS_ATTR_FATTR_SIZE);
1370 }
1371 
1372 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1373 {
1374         int ret;
1375 
1376         trace_nfs_refresh_inode_enter(inode);
1377 
1378         nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1379 
1380         if (nfs_inode_attrs_need_update(inode, fattr))
1381                 ret = nfs_update_inode(inode, fattr);
1382         else
1383                 ret = nfs_check_inode_attributes(inode, fattr);
1384 
1385         trace_nfs_refresh_inode_exit(inode, ret);
1386         return ret;
1387 }
1388 
1389 /**
1390  * nfs_refresh_inode - try to update the inode attribute cache
1391  * @inode - pointer to inode
1392  * @fattr - updated attributes
1393  *
1394  * Check that an RPC call that returned attributes has not overlapped with
1395  * other recent updates of the inode metadata, then decide whether it is
1396  * safe to do a full update of the inode attributes, or whether just to
1397  * call nfs_check_inode_attributes.
1398  */
1399 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1400 {
1401         int status;
1402 
1403         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1404                 return 0;
1405         spin_lock(&inode->i_lock);
1406         status = nfs_refresh_inode_locked(inode, fattr);
1407         spin_unlock(&inode->i_lock);
1408 
1409         return status;
1410 }
1411 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1412 
1413 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1414 {
1415         unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1416 
1417         if (S_ISDIR(inode->i_mode))
1418                 invalid |= NFS_INO_INVALID_DATA;
1419         nfs_set_cache_invalid(inode, invalid);
1420         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1421                 return 0;
1422         return nfs_refresh_inode_locked(inode, fattr);
1423 }
1424 
1425 /**
1426  * nfs_post_op_update_inode - try to update the inode attribute cache
1427  * @inode - pointer to inode
1428  * @fattr - updated attributes
1429  *
1430  * After an operation that has changed the inode metadata, mark the
1431  * attribute cache as being invalid, then try to update it.
1432  *
1433  * NB: if the server didn't return any post op attributes, this
1434  * function will force the retrieval of attributes before the next
1435  * NFS request.  Thus it should be used only for operations that
1436  * are expected to change one or more attributes, to avoid
1437  * unnecessary NFS requests and trips through nfs_update_inode().
1438  */
1439 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1440 {
1441         int status;
1442 
1443         spin_lock(&inode->i_lock);
1444         status = nfs_post_op_update_inode_locked(inode, fattr);
1445         spin_unlock(&inode->i_lock);
1446 
1447         return status;
1448 }
1449 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1450 
1451 /**
1452  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1453  * @inode - pointer to inode
1454  * @fattr - updated attributes
1455  *
1456  * After an operation that has changed the inode metadata, mark the
1457  * attribute cache as being invalid, then try to update it. Fake up
1458  * weak cache consistency data, if none exist.
1459  *
1460  * This function is mainly designed to be used by the ->write_done() functions.
1461  */
1462 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1463 {
1464         int status;
1465 
1466         spin_lock(&inode->i_lock);
1467         /* Don't do a WCC update if these attributes are already stale */
1468         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1469                         !nfs_inode_attrs_need_update(inode, fattr)) {
1470                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1471                                 | NFS_ATTR_FATTR_PRESIZE
1472                                 | NFS_ATTR_FATTR_PREMTIME
1473                                 | NFS_ATTR_FATTR_PRECTIME);
1474                 goto out_noforce;
1475         }
1476         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1477                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1478                 fattr->pre_change_attr = inode->i_version;
1479                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1480         }
1481         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1482                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1483                 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1484                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1485         }
1486         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1487                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1488                 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1489                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1490         }
1491         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1492                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1493                 fattr->pre_size = i_size_read(inode);
1494                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1495         }
1496 out_noforce:
1497         status = nfs_post_op_update_inode_locked(inode, fattr);
1498         spin_unlock(&inode->i_lock);
1499         return status;
1500 }
1501 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1502 
1503 /*
1504  * Many nfs protocol calls return the new file attributes after
1505  * an operation.  Here we update the inode to reflect the state
1506  * of the server's inode.
1507  *
1508  * This is a bit tricky because we have to make sure all dirty pages
1509  * have been sent off to the server before calling invalidate_inode_pages.
1510  * To make sure no other process adds more write requests while we try
1511  * our best to flush them, we make them sleep during the attribute refresh.
1512  *
1513  * A very similar scenario holds for the dir cache.
1514  */
1515 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1516 {
1517         struct nfs_server *server;
1518         struct nfs_inode *nfsi = NFS_I(inode);
1519         loff_t cur_isize, new_isize;
1520         unsigned long invalid = 0;
1521         unsigned long now = jiffies;
1522         unsigned long save_cache_validity;
1523 
1524         dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1525                         __func__, inode->i_sb->s_id, inode->i_ino,
1526                         nfs_display_fhandle_hash(NFS_FH(inode)),
1527                         atomic_read(&inode->i_count), fattr->valid);
1528 
1529         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1530                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1531                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1532                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1533                         inode->i_sb->s_id, (long long)nfsi->fileid,
1534                         (long long)fattr->fileid);
1535                 goto out_err;
1536         }
1537 
1538         /*
1539          * Make sure the inode's type hasn't changed.
1540          */
1541         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1542                 /*
1543                 * Big trouble! The inode has become a different object.
1544                 */
1545                 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1546                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1547                 goto out_err;
1548         }
1549 
1550         server = NFS_SERVER(inode);
1551         /* Update the fsid? */
1552         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1553                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1554                         !IS_AUTOMOUNT(inode))
1555                 server->fsid = fattr->fsid;
1556 
1557         /*
1558          * Update the read time so we don't revalidate too often.
1559          */
1560         nfsi->read_cache_jiffies = fattr->time_start;
1561 
1562         save_cache_validity = nfsi->cache_validity;
1563         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1564                         | NFS_INO_INVALID_ATIME
1565                         | NFS_INO_REVAL_FORCED
1566                         | NFS_INO_REVAL_PAGECACHE);
1567 
1568         /* Do atomic weak cache consistency updates */
1569         invalid |= nfs_wcc_update_inode(inode, fattr);
1570 
1571         /* More cache consistency checks */
1572         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1573                 if (inode->i_version != fattr->change_attr) {
1574                         dprintk("NFS: change_attr change on server for file %s/%ld\n",
1575                                         inode->i_sb->s_id, inode->i_ino);
1576                         invalid |= NFS_INO_INVALID_ATTR
1577                                 | NFS_INO_INVALID_DATA
1578                                 | NFS_INO_INVALID_ACCESS
1579                                 | NFS_INO_INVALID_ACL
1580                                 | NFS_INO_REVAL_PAGECACHE;
1581                         if (S_ISDIR(inode->i_mode))
1582                                 nfs_force_lookup_revalidate(inode);
1583                         inode->i_version = fattr->change_attr;
1584                 }
1585         } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1586                 nfsi->cache_validity |= save_cache_validity;
1587 
1588         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1589                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1590         } else if (server->caps & NFS_CAP_MTIME)
1591                 nfsi->cache_validity |= save_cache_validity &
1592                                 (NFS_INO_INVALID_ATTR
1593                                 | NFS_INO_REVAL_FORCED);
1594 
1595         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1596                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1597         } else if (server->caps & NFS_CAP_CTIME)
1598                 nfsi->cache_validity |= save_cache_validity &
1599                                 (NFS_INO_INVALID_ATTR
1600                                 | NFS_INO_REVAL_FORCED);
1601 
1602         /* Check if our cached file size is stale */
1603         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1604                 new_isize = nfs_size_to_loff_t(fattr->size);
1605                 cur_isize = i_size_read(inode);
1606                 if (new_isize != cur_isize) {
1607                         /* Do we perhaps have any outstanding writes, or has
1608                          * the file grown beyond our last write? */
1609                         if ((nfsi->npages == 0) || new_isize > cur_isize) {
1610                                 i_size_write(inode, new_isize);
1611                                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1612                                 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1613                         }
1614                         dprintk("NFS: isize change on server for file %s/%ld "
1615                                         "(%Ld to %Ld)\n",
1616                                         inode->i_sb->s_id,
1617                                         inode->i_ino,
1618                                         (long long)cur_isize,
1619                                         (long long)new_isize);
1620                 }
1621         } else
1622                 nfsi->cache_validity |= save_cache_validity &
1623                                 (NFS_INO_INVALID_ATTR
1624                                 | NFS_INO_REVAL_PAGECACHE
1625                                 | NFS_INO_REVAL_FORCED);
1626 
1627 
1628         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1629                 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1630         else if (server->caps & NFS_CAP_ATIME)
1631                 nfsi->cache_validity |= save_cache_validity &
1632                                 (NFS_INO_INVALID_ATIME
1633                                 | NFS_INO_REVAL_FORCED);
1634 
1635         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1636                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1637                         umode_t newmode = inode->i_mode & S_IFMT;
1638                         newmode |= fattr->mode & S_IALLUGO;
1639                         inode->i_mode = newmode;
1640                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1641                 }
1642         } else if (server->caps & NFS_CAP_MODE)
1643                 nfsi->cache_validity |= save_cache_validity &
1644                                 (NFS_INO_INVALID_ATTR
1645                                 | NFS_INO_INVALID_ACCESS
1646                                 | NFS_INO_INVALID_ACL
1647                                 | NFS_INO_REVAL_FORCED);
1648 
1649         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1650                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1651                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1652                         inode->i_uid = fattr->uid;
1653                 }
1654         } else if (server->caps & NFS_CAP_OWNER)
1655                 nfsi->cache_validity |= save_cache_validity &
1656                                 (NFS_INO_INVALID_ATTR
1657                                 | NFS_INO_INVALID_ACCESS
1658                                 | NFS_INO_INVALID_ACL
1659                                 | NFS_INO_REVAL_FORCED);
1660 
1661         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1662                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1663                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1664                         inode->i_gid = fattr->gid;
1665                 }
1666         } else if (server->caps & NFS_CAP_OWNER_GROUP)
1667                 nfsi->cache_validity |= save_cache_validity &
1668                                 (NFS_INO_INVALID_ATTR
1669                                 | NFS_INO_INVALID_ACCESS
1670                                 | NFS_INO_INVALID_ACL
1671                                 | NFS_INO_REVAL_FORCED);
1672 
1673         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1674                 if (inode->i_nlink != fattr->nlink) {
1675                         invalid |= NFS_INO_INVALID_ATTR;
1676                         if (S_ISDIR(inode->i_mode))
1677                                 invalid |= NFS_INO_INVALID_DATA;
1678                         set_nlink(inode, fattr->nlink);
1679                 }
1680         } else if (server->caps & NFS_CAP_NLINK)
1681                 nfsi->cache_validity |= save_cache_validity &
1682                                 (NFS_INO_INVALID_ATTR
1683                                 | NFS_INO_REVAL_FORCED);
1684 
1685         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1686                 /*
1687                  * report the blocks in 512byte units
1688                  */
1689                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1690         }
1691         if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1692                 inode->i_blocks = fattr->du.nfs2.blocks;
1693 
1694         /* Update attrtimeo value if we're out of the unstable period */
1695         if (invalid & NFS_INO_INVALID_ATTR) {
1696                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1697                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1698                 nfsi->attrtimeo_timestamp = now;
1699                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1700         } else {
1701                 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1702                         if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1703                                 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1704                         nfsi->attrtimeo_timestamp = now;
1705                 }
1706         }
1707         invalid &= ~NFS_INO_INVALID_ATTR;
1708         /* Don't invalidate the data if we were to blame */
1709         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1710                                 || S_ISLNK(inode->i_mode)))
1711                 invalid &= ~NFS_INO_INVALID_DATA;
1712         if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1713                         (save_cache_validity & NFS_INO_REVAL_FORCED))
1714                 nfs_set_cache_invalid(inode, invalid);
1715 
1716         return 0;
1717  out_err:
1718         /*
1719          * No need to worry about unhashing the dentry, as the
1720          * lookup validation will know that the inode is bad.
1721          * (But we fall through to invalidate the caches.)
1722          */
1723         nfs_invalidate_inode(inode);
1724         return -ESTALE;
1725 }
1726 
1727 struct inode *nfs_alloc_inode(struct super_block *sb)
1728 {
1729         struct nfs_inode *nfsi;
1730         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1731         if (!nfsi)
1732                 return NULL;
1733         nfsi->flags = 0UL;
1734         nfsi->cache_validity = 0UL;
1735 #if IS_ENABLED(CONFIG_NFS_V4)
1736         nfsi->nfs4_acl = NULL;
1737 #endif /* CONFIG_NFS_V4 */
1738         return &nfsi->vfs_inode;
1739 }
1740 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1741 
1742 static void nfs_i_callback(struct rcu_head *head)
1743 {
1744         struct inode *inode = container_of(head, struct inode, i_rcu);
1745         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1746 }
1747 
1748 void nfs_destroy_inode(struct inode *inode)
1749 {
1750         call_rcu(&inode->i_rcu, nfs_i_callback);
1751 }
1752 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1753 
1754 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1755 {
1756 #if IS_ENABLED(CONFIG_NFS_V4)
1757         INIT_LIST_HEAD(&nfsi->open_states);
1758         nfsi->delegation = NULL;
1759         nfsi->delegation_state = 0;
1760         init_rwsem(&nfsi->rwsem);
1761         nfsi->layout = NULL;
1762 #endif
1763 }
1764 
1765 static void init_once(void *foo)
1766 {
1767         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1768 
1769         inode_init_once(&nfsi->vfs_inode);
1770         INIT_LIST_HEAD(&nfsi->open_files);
1771         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1772         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1773         INIT_LIST_HEAD(&nfsi->commit_info.list);
1774         nfsi->npages = 0;
1775         nfsi->commit_info.ncommit = 0;
1776         atomic_set(&nfsi->commit_info.rpcs_out, 0);
1777         atomic_set(&nfsi->silly_count, 1);
1778         INIT_HLIST_HEAD(&nfsi->silly_list);
1779         init_waitqueue_head(&nfsi->waitqueue);
1780         nfs4_init_once(nfsi);
1781 }
1782 
1783 static int __init nfs_init_inodecache(void)
1784 {
1785         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1786                                              sizeof(struct nfs_inode),
1787                                              0, (SLAB_RECLAIM_ACCOUNT|
1788                                                 SLAB_MEM_SPREAD),
1789                                              init_once);
1790         if (nfs_inode_cachep == NULL)
1791                 return -ENOMEM;
1792 
1793         return 0;
1794 }
1795 
1796 static void nfs_destroy_inodecache(void)
1797 {
1798         /*
1799          * Make sure all delayed rcu free inodes are flushed before we
1800          * destroy cache.
1801          */
1802         rcu_barrier();
1803         kmem_cache_destroy(nfs_inode_cachep);
1804 }
1805 
1806 struct workqueue_struct *nfsiod_workqueue;
1807 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1808 
1809 /*
1810  * start up the nfsiod workqueue
1811  */
1812 static int nfsiod_start(void)
1813 {
1814         struct workqueue_struct *wq;
1815         dprintk("RPC:       creating workqueue nfsiod\n");
1816         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1817         if (wq == NULL)
1818                 return -ENOMEM;
1819         nfsiod_workqueue = wq;
1820         return 0;
1821 }
1822 
1823 /*
1824  * Destroy the nfsiod workqueue
1825  */
1826 static void nfsiod_stop(void)
1827 {
1828         struct workqueue_struct *wq;
1829 
1830         wq = nfsiod_workqueue;
1831         if (wq == NULL)
1832                 return;
1833         nfsiod_workqueue = NULL;
1834         destroy_workqueue(wq);
1835 }
1836 
1837 int nfs_net_id;
1838 EXPORT_SYMBOL_GPL(nfs_net_id);
1839 
1840 static int nfs_net_init(struct net *net)
1841 {
1842         nfs_clients_init(net);
1843         return 0;
1844 }
1845 
1846 static void nfs_net_exit(struct net *net)
1847 {
1848         nfs_cleanup_cb_ident_idr(net);
1849 }
1850 
1851 static struct pernet_operations nfs_net_ops = {
1852         .init = nfs_net_init,
1853         .exit = nfs_net_exit,
1854         .id   = &nfs_net_id,
1855         .size = sizeof(struct nfs_net),
1856 };
1857 
1858 /*
1859  * Initialize NFS
1860  */
1861 static int __init init_nfs_fs(void)
1862 {
1863         int err;
1864 
1865         err = register_pernet_subsys(&nfs_net_ops);
1866         if (err < 0)
1867                 goto out9;
1868 
1869         err = nfs_fscache_register();
1870         if (err < 0)
1871                 goto out8;
1872 
1873         err = nfsiod_start();
1874         if (err)
1875                 goto out7;
1876 
1877         err = nfs_fs_proc_init();
1878         if (err)
1879                 goto out6;
1880 
1881         err = nfs_init_nfspagecache();
1882         if (err)
1883                 goto out5;
1884 
1885         err = nfs_init_inodecache();
1886         if (err)
1887                 goto out4;
1888 
1889         err = nfs_init_readpagecache();
1890         if (err)
1891                 goto out3;
1892 
1893         err = nfs_init_writepagecache();
1894         if (err)
1895                 goto out2;
1896 
1897         err = nfs_init_directcache();
1898         if (err)
1899                 goto out1;
1900 
1901 #ifdef CONFIG_PROC_FS
1902         rpc_proc_register(&init_net, &nfs_rpcstat);
1903 #endif
1904         if ((err = register_nfs_fs()) != 0)
1905                 goto out0;
1906 
1907         return 0;
1908 out0:
1909 #ifdef CONFIG_PROC_FS
1910         rpc_proc_unregister(&init_net, "nfs");
1911 #endif
1912         nfs_destroy_directcache();
1913 out1:
1914         nfs_destroy_writepagecache();
1915 out2:
1916         nfs_destroy_readpagecache();
1917 out3:
1918         nfs_destroy_inodecache();
1919 out4:
1920         nfs_destroy_nfspagecache();
1921 out5:
1922         nfs_fs_proc_exit();
1923 out6:
1924         nfsiod_stop();
1925 out7:
1926         nfs_fscache_unregister();
1927 out8:
1928         unregister_pernet_subsys(&nfs_net_ops);
1929 out9:
1930         return err;
1931 }
1932 
1933 static void __exit exit_nfs_fs(void)
1934 {
1935         nfs_destroy_directcache();
1936         nfs_destroy_writepagecache();
1937         nfs_destroy_readpagecache();
1938         nfs_destroy_inodecache();
1939         nfs_destroy_nfspagecache();
1940         nfs_fscache_unregister();
1941         unregister_pernet_subsys(&nfs_net_ops);
1942 #ifdef CONFIG_PROC_FS
1943         rpc_proc_unregister(&init_net, "nfs");
1944 #endif
1945         unregister_nfs_fs();
1946         nfs_fs_proc_exit();
1947         nfsiod_stop();
1948 }
1949 
1950 /* Not quite true; I just maintain it */
1951 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1952 MODULE_LICENSE("GPL");
1953 module_param(enable_ino64, bool, 0644);
1954 
1955 module_init(init_nfs_fs)
1956 module_exit(exit_nfs_fs)
1957 

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