Version:  2.0.40 2.2.26 2.4.37 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 3.17

Linux/fs/nfs/inode.c

  1 /*
  2  *  linux/fs/nfs/inode.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  *
  6  *  nfs inode and superblock handling functions
  7  *
  8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 10  *
 11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 12  *  J.S.Peatfield@damtp.cam.ac.uk
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/init.h>
 18 #include <linux/sched.h>
 19 #include <linux/time.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/string.h>
 23 #include <linux/stat.h>
 24 #include <linux/errno.h>
 25 #include <linux/unistd.h>
 26 #include <linux/sunrpc/clnt.h>
 27 #include <linux/sunrpc/stats.h>
 28 #include <linux/sunrpc/metrics.h>
 29 #include <linux/nfs_fs.h>
 30 #include <linux/nfs_mount.h>
 31 #include <linux/nfs4_mount.h>
 32 #include <linux/lockd/bind.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/mount.h>
 35 #include <linux/vfs.h>
 36 #include <linux/inet.h>
 37 #include <linux/nfs_xdr.h>
 38 #include <linux/slab.h>
 39 #include <linux/compat.h>
 40 #include <linux/freezer.h>
 41 
 42 #include <asm/uaccess.h>
 43 
 44 #include "nfs4_fs.h"
 45 #include "callback.h"
 46 #include "delegation.h"
 47 #include "iostat.h"
 48 #include "internal.h"
 49 #include "fscache.h"
 50 #include "pnfs.h"
 51 #include "nfs.h"
 52 #include "netns.h"
 53 
 54 #include "nfstrace.h"
 55 
 56 #define NFSDBG_FACILITY         NFSDBG_VFS
 57 
 58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
 59 
 60 /* Default is to see 64-bit inode numbers */
 61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
 62 
 63 static void nfs_invalidate_inode(struct inode *);
 64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
 65 
 66 static struct kmem_cache * nfs_inode_cachep;
 67 
 68 static inline unsigned long
 69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
 70 {
 71         return nfs_fileid_to_ino_t(fattr->fileid);
 72 }
 73 
 74 /**
 75  * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
 76  * @word: long word containing the bit lock
 77  */
 78 int nfs_wait_bit_killable(struct wait_bit_key *key)
 79 {
 80         if (fatal_signal_pending(current))
 81                 return -ERESTARTSYS;
 82         freezable_schedule_unsafe();
 83         return 0;
 84 }
 85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
 86 
 87 /**
 88  * nfs_compat_user_ino64 - returns the user-visible inode number
 89  * @fileid: 64-bit fileid
 90  *
 91  * This function returns a 32-bit inode number if the boot parameter
 92  * nfs.enable_ino64 is zero.
 93  */
 94 u64 nfs_compat_user_ino64(u64 fileid)
 95 {
 96 #ifdef CONFIG_COMPAT
 97         compat_ulong_t ino;
 98 #else   
 99         unsigned long ino;
100 #endif
101 
102         if (enable_ino64)
103                 return fileid;
104         ino = fileid;
105         if (sizeof(ino) < sizeof(fileid))
106                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107         return ino;
108 }
109 
110 int nfs_drop_inode(struct inode *inode)
111 {
112         return NFS_STALE(inode) || generic_drop_inode(inode);
113 }
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
115 
116 void nfs_clear_inode(struct inode *inode)
117 {
118         /*
119          * The following should never happen...
120          */
121         WARN_ON_ONCE(nfs_have_writebacks(inode));
122         WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123         nfs_zap_acl_cache(inode);
124         nfs_access_zap_cache(inode);
125         nfs_fscache_clear_inode(inode);
126 }
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
128 
129 void nfs_evict_inode(struct inode *inode)
130 {
131         truncate_inode_pages_final(&inode->i_data);
132         clear_inode(inode);
133         nfs_clear_inode(inode);
134 }
135 
136 /**
137  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138  */
139 int nfs_sync_mapping(struct address_space *mapping)
140 {
141         int ret = 0;
142 
143         if (mapping->nrpages != 0) {
144                 unmap_mapping_range(mapping, 0, 0, 0);
145                 ret = nfs_wb_all(mapping->host);
146         }
147         return ret;
148 }
149 
150 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
151 {
152         struct nfs_inode *nfsi = NFS_I(inode);
153 
154         if (inode->i_mapping->nrpages == 0)
155                 flags &= ~NFS_INO_INVALID_DATA;
156         nfsi->cache_validity |= flags;
157         if (flags & NFS_INO_INVALID_DATA)
158                 nfs_fscache_invalidate(inode);
159 }
160 
161 /*
162  * Invalidate the local caches
163  */
164 static void nfs_zap_caches_locked(struct inode *inode)
165 {
166         struct nfs_inode *nfsi = NFS_I(inode);
167         int mode = inode->i_mode;
168 
169         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
170 
171         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
172         nfsi->attrtimeo_timestamp = jiffies;
173 
174         memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
175         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
176                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
177                                         | NFS_INO_INVALID_DATA
178                                         | NFS_INO_INVALID_ACCESS
179                                         | NFS_INO_INVALID_ACL
180                                         | NFS_INO_REVAL_PAGECACHE);
181         } else
182                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
183                                         | NFS_INO_INVALID_ACCESS
184                                         | NFS_INO_INVALID_ACL
185                                         | NFS_INO_REVAL_PAGECACHE);
186         nfs_zap_label_cache_locked(nfsi);
187 }
188 
189 void nfs_zap_caches(struct inode *inode)
190 {
191         spin_lock(&inode->i_lock);
192         nfs_zap_caches_locked(inode);
193         spin_unlock(&inode->i_lock);
194 }
195 
196 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
197 {
198         if (mapping->nrpages != 0) {
199                 spin_lock(&inode->i_lock);
200                 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
201                 spin_unlock(&inode->i_lock);
202         }
203 }
204 
205 void nfs_zap_acl_cache(struct inode *inode)
206 {
207         void (*clear_acl_cache)(struct inode *);
208 
209         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
210         if (clear_acl_cache != NULL)
211                 clear_acl_cache(inode);
212         spin_lock(&inode->i_lock);
213         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
214         spin_unlock(&inode->i_lock);
215 }
216 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
217 
218 void nfs_invalidate_atime(struct inode *inode)
219 {
220         spin_lock(&inode->i_lock);
221         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
222         spin_unlock(&inode->i_lock);
223 }
224 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
225 
226 /*
227  * Invalidate, but do not unhash, the inode.
228  * NB: must be called with inode->i_lock held!
229  */
230 static void nfs_invalidate_inode(struct inode *inode)
231 {
232         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
233         nfs_zap_caches_locked(inode);
234 }
235 
236 struct nfs_find_desc {
237         struct nfs_fh           *fh;
238         struct nfs_fattr        *fattr;
239 };
240 
241 /*
242  * In NFSv3 we can have 64bit inode numbers. In order to support
243  * this, and re-exported directories (also seen in NFSv2)
244  * we are forced to allow 2 different inodes to have the same
245  * i_ino.
246  */
247 static int
248 nfs_find_actor(struct inode *inode, void *opaque)
249 {
250         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
251         struct nfs_fh           *fh = desc->fh;
252         struct nfs_fattr        *fattr = desc->fattr;
253 
254         if (NFS_FILEID(inode) != fattr->fileid)
255                 return 0;
256         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
257                 return 0;
258         if (nfs_compare_fh(NFS_FH(inode), fh))
259                 return 0;
260         if (is_bad_inode(inode) || NFS_STALE(inode))
261                 return 0;
262         return 1;
263 }
264 
265 static int
266 nfs_init_locked(struct inode *inode, void *opaque)
267 {
268         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
269         struct nfs_fattr        *fattr = desc->fattr;
270 
271         set_nfs_fileid(inode, fattr->fileid);
272         nfs_copy_fh(NFS_FH(inode), desc->fh);
273         return 0;
274 }
275 
276 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
277 static void nfs_clear_label_invalid(struct inode *inode)
278 {
279         spin_lock(&inode->i_lock);
280         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
281         spin_unlock(&inode->i_lock);
282 }
283 
284 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
285                                         struct nfs4_label *label)
286 {
287         int error;
288 
289         if (label == NULL)
290                 return;
291 
292         if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
293                 error = security_inode_notifysecctx(inode, label->label,
294                                 label->len);
295                 if (error)
296                         printk(KERN_ERR "%s() %s %d "
297                                         "security_inode_notifysecctx() %d\n",
298                                         __func__,
299                                         (char *)label->label,
300                                         label->len, error);
301                 nfs_clear_label_invalid(inode);
302         }
303 }
304 
305 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
306 {
307         struct nfs4_label *label = NULL;
308         int minor_version = server->nfs_client->cl_minorversion;
309 
310         if (minor_version < 2)
311                 return label;
312 
313         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
314                 return label;
315 
316         label = kzalloc(sizeof(struct nfs4_label), flags);
317         if (label == NULL)
318                 return ERR_PTR(-ENOMEM);
319 
320         label->label = kzalloc(NFS4_MAXLABELLEN, flags);
321         if (label->label == NULL) {
322                 kfree(label);
323                 return ERR_PTR(-ENOMEM);
324         }
325         label->len = NFS4_MAXLABELLEN;
326 
327         return label;
328 }
329 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
330 #else
331 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
332                                         struct nfs4_label *label)
333 {
334 }
335 #endif
336 EXPORT_SYMBOL_GPL(nfs_setsecurity);
337 
338 /*
339  * This is our front-end to iget that looks up inodes by file handle
340  * instead of inode number.
341  */
342 struct inode *
343 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
344 {
345         struct nfs_find_desc desc = {
346                 .fh     = fh,
347                 .fattr  = fattr
348         };
349         struct inode *inode = ERR_PTR(-ENOENT);
350         unsigned long hash;
351 
352         nfs_attr_check_mountpoint(sb, fattr);
353 
354         if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
355             !nfs_attr_use_mounted_on_fileid(fattr))
356                 goto out_no_inode;
357         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
358                 goto out_no_inode;
359 
360         hash = nfs_fattr_to_ino_t(fattr);
361 
362         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
363         if (inode == NULL) {
364                 inode = ERR_PTR(-ENOMEM);
365                 goto out_no_inode;
366         }
367 
368         if (inode->i_state & I_NEW) {
369                 struct nfs_inode *nfsi = NFS_I(inode);
370                 unsigned long now = jiffies;
371 
372                 /* We set i_ino for the few things that still rely on it,
373                  * such as stat(2) */
374                 inode->i_ino = hash;
375 
376                 /* We can't support update_atime(), since the server will reset it */
377                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
378                 inode->i_mode = fattr->mode;
379                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
380                                 && nfs_server_capable(inode, NFS_CAP_MODE))
381                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
382                 /* Why so? Because we want revalidate for devices/FIFOs, and
383                  * that's precisely what we have in nfs_file_inode_operations.
384                  */
385                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
386                 if (S_ISREG(inode->i_mode)) {
387                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
388                         inode->i_data.a_ops = &nfs_file_aops;
389                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
390                 } else if (S_ISDIR(inode->i_mode)) {
391                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
392                         inode->i_fop = &nfs_dir_operations;
393                         inode->i_data.a_ops = &nfs_dir_aops;
394                         /* Deal with crossing mountpoints */
395                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
396                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
397                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
398                                         inode->i_op = &nfs_referral_inode_operations;
399                                 else
400                                         inode->i_op = &nfs_mountpoint_inode_operations;
401                                 inode->i_fop = NULL;
402                                 inode->i_flags |= S_AUTOMOUNT;
403                         }
404                 } else if (S_ISLNK(inode->i_mode))
405                         inode->i_op = &nfs_symlink_inode_operations;
406                 else
407                         init_special_inode(inode, inode->i_mode, fattr->rdev);
408 
409                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
410                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
411                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
412                 inode->i_version = 0;
413                 inode->i_size = 0;
414                 clear_nlink(inode);
415                 inode->i_uid = make_kuid(&init_user_ns, -2);
416                 inode->i_gid = make_kgid(&init_user_ns, -2);
417                 inode->i_blocks = 0;
418                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
419                 nfsi->write_io = 0;
420                 nfsi->read_io = 0;
421 
422                 nfsi->read_cache_jiffies = fattr->time_start;
423                 nfsi->attr_gencount = fattr->gencount;
424                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
425                         inode->i_atime = fattr->atime;
426                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
427                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
428                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
429                         inode->i_mtime = fattr->mtime;
430                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
431                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
432                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
433                         inode->i_ctime = fattr->ctime;
434                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
435                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
436                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
437                         inode->i_version = fattr->change_attr;
438                 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
439                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
440                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
441                         inode->i_size = nfs_size_to_loff_t(fattr->size);
442                 else
443                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
444                                 | NFS_INO_REVAL_PAGECACHE);
445                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
446                         set_nlink(inode, fattr->nlink);
447                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
448                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
449                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
450                         inode->i_uid = fattr->uid;
451                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
452                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
453                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
454                         inode->i_gid = fattr->gid;
455                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
456                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
457                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
458                         inode->i_blocks = fattr->du.nfs2.blocks;
459                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
460                         /*
461                          * report the blocks in 512byte units
462                          */
463                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
464                 }
465 
466                 nfs_setsecurity(inode, fattr, label);
467 
468                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
469                 nfsi->attrtimeo_timestamp = now;
470                 nfsi->access_cache = RB_ROOT;
471 
472                 nfs_fscache_init_inode(inode);
473 
474                 unlock_new_inode(inode);
475         } else
476                 nfs_refresh_inode(inode, fattr);
477         dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
478                 inode->i_sb->s_id,
479                 (unsigned long long)NFS_FILEID(inode),
480                 nfs_display_fhandle_hash(fh),
481                 atomic_read(&inode->i_count));
482 
483 out:
484         return inode;
485 
486 out_no_inode:
487         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
488         goto out;
489 }
490 EXPORT_SYMBOL_GPL(nfs_fhget);
491 
492 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
493 
494 int
495 nfs_setattr(struct dentry *dentry, struct iattr *attr)
496 {
497         struct inode *inode = dentry->d_inode;
498         struct nfs_fattr *fattr;
499         int error = -ENOMEM;
500 
501         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
502 
503         /* skip mode change if it's just for clearing setuid/setgid */
504         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
505                 attr->ia_valid &= ~ATTR_MODE;
506 
507         if (attr->ia_valid & ATTR_SIZE) {
508                 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 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode)
1006 {
1007         if (!(NFS_I(inode)->cache_validity &
1008                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
1009                         && !nfs_attribute_cache_expired(inode))
1010                 return NFS_STALE(inode) ? -ESTALE : 0;
1011         return -ECHILD;
1012 }
1013 
1014 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1015 {
1016         struct nfs_inode *nfsi = NFS_I(inode);
1017         int ret;
1018 
1019         if (mapping->nrpages != 0) {
1020                 if (S_ISREG(inode->i_mode)) {
1021                         ret = nfs_sync_mapping(mapping);
1022                         if (ret < 0)
1023                                 return ret;
1024                 }
1025                 ret = invalidate_inode_pages2(mapping);
1026                 if (ret < 0)
1027                         return ret;
1028         }
1029         if (S_ISDIR(inode->i_mode)) {
1030                 spin_lock(&inode->i_lock);
1031                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1032                 spin_unlock(&inode->i_lock);
1033         }
1034         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1035         nfs_fscache_wait_on_invalidate(inode);
1036 
1037         dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1038                         inode->i_sb->s_id,
1039                         (unsigned long long)NFS_FILEID(inode));
1040         return 0;
1041 }
1042 
1043 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1044 {
1045         if (nfs_have_delegated_attributes(inode))
1046                 return false;
1047         return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1048                 || nfs_attribute_timeout(inode)
1049                 || NFS_STALE(inode);
1050 }
1051 
1052 /**
1053  * nfs_revalidate_mapping - Revalidate the pagecache
1054  * @inode - pointer to host inode
1055  * @mapping - pointer to mapping
1056  */
1057 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1058 {
1059         struct nfs_inode *nfsi = NFS_I(inode);
1060         unsigned long *bitlock = &nfsi->flags;
1061         int ret = 0;
1062 
1063         /* swapfiles are not supposed to be shared. */
1064         if (IS_SWAPFILE(inode))
1065                 goto out;
1066 
1067         if (nfs_mapping_need_revalidate_inode(inode)) {
1068                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1069                 if (ret < 0)
1070                         goto out;
1071         }
1072 
1073         /*
1074          * We must clear NFS_INO_INVALID_DATA first to ensure that
1075          * invalidations that come in while we're shooting down the mappings
1076          * are respected. But, that leaves a race window where one revalidator
1077          * can clear the flag, and then another checks it before the mapping
1078          * gets invalidated. Fix that by serializing access to this part of
1079          * the function.
1080          *
1081          * At the same time, we need to allow other tasks to see whether we
1082          * might be in the middle of invalidating the pages, so we only set
1083          * the bit lock here if it looks like we're going to be doing that.
1084          */
1085         for (;;) {
1086                 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1087                                          nfs_wait_bit_killable, TASK_KILLABLE);
1088                 if (ret)
1089                         goto out;
1090                 spin_lock(&inode->i_lock);
1091                 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1092                         spin_unlock(&inode->i_lock);
1093                         continue;
1094                 }
1095                 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1096                         break;
1097                 spin_unlock(&inode->i_lock);
1098                 goto out;
1099         }
1100 
1101         set_bit(NFS_INO_INVALIDATING, bitlock);
1102         smp_wmb();
1103         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1104         spin_unlock(&inode->i_lock);
1105         trace_nfs_invalidate_mapping_enter(inode);
1106         ret = nfs_invalidate_mapping(inode, mapping);
1107         trace_nfs_invalidate_mapping_exit(inode, ret);
1108 
1109         clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1110         smp_mb__after_atomic();
1111         wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1112 out:
1113         return ret;
1114 }
1115 
1116 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1117 {
1118         struct nfs_inode *nfsi = NFS_I(inode);
1119         unsigned long ret = 0;
1120 
1121         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1122                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1123                         && inode->i_version == fattr->pre_change_attr) {
1124                 inode->i_version = fattr->change_attr;
1125                 if (S_ISDIR(inode->i_mode))
1126                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1127                 ret |= NFS_INO_INVALID_ATTR;
1128         }
1129         /* If we have atomic WCC data, we may update some attributes */
1130         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1131                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1132                         && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1133                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1134                 ret |= NFS_INO_INVALID_ATTR;
1135         }
1136 
1137         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1138                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1139                         && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1140                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1141                 if (S_ISDIR(inode->i_mode))
1142                         nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1143                 ret |= NFS_INO_INVALID_ATTR;
1144         }
1145         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1146                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1147                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1148                         && nfsi->npages == 0) {
1149                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1150                 ret |= NFS_INO_INVALID_ATTR;
1151         }
1152 
1153         return ret;
1154 }
1155 
1156 /**
1157  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1158  * @inode - pointer to inode
1159  * @fattr - updated attributes
1160  *
1161  * Verifies the attribute cache. If we have just changed the attributes,
1162  * so that fattr carries weak cache consistency data, then it may
1163  * also update the ctime/mtime/change_attribute.
1164  */
1165 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1166 {
1167         struct nfs_inode *nfsi = NFS_I(inode);
1168         loff_t cur_size, new_isize;
1169         unsigned long invalid = 0;
1170 
1171 
1172         if (nfs_have_delegated_attributes(inode))
1173                 return 0;
1174         /* Has the inode gone and changed behind our back? */
1175         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1176                 return -EIO;
1177         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1178                 return -EIO;
1179 
1180         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1181                         inode->i_version != fattr->change_attr)
1182                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1183 
1184         /* Verify a few of the more important attributes */
1185         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1186                 invalid |= NFS_INO_INVALID_ATTR;
1187 
1188         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1189                 cur_size = i_size_read(inode);
1190                 new_isize = nfs_size_to_loff_t(fattr->size);
1191                 if (cur_size != new_isize && nfsi->npages == 0)
1192                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1193         }
1194 
1195         /* Have any file permissions changed? */
1196         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1197                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1198         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1199                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1200         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1201                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1202 
1203         /* Has the link count changed? */
1204         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1205                 invalid |= NFS_INO_INVALID_ATTR;
1206 
1207         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1208                 invalid |= NFS_INO_INVALID_ATIME;
1209 
1210         if (invalid != 0)
1211                 nfs_set_cache_invalid(inode, invalid);
1212 
1213         nfsi->read_cache_jiffies = fattr->time_start;
1214         return 0;
1215 }
1216 
1217 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1218 {
1219         if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1220                 return 0;
1221         return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1222 }
1223 
1224 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1225 {
1226         if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1227                 return 0;
1228         return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1229 }
1230 
1231 static atomic_long_t nfs_attr_generation_counter;
1232 
1233 static unsigned long nfs_read_attr_generation_counter(void)
1234 {
1235         return atomic_long_read(&nfs_attr_generation_counter);
1236 }
1237 
1238 unsigned long nfs_inc_attr_generation_counter(void)
1239 {
1240         return atomic_long_inc_return(&nfs_attr_generation_counter);
1241 }
1242 
1243 void nfs_fattr_init(struct nfs_fattr *fattr)
1244 {
1245         fattr->valid = 0;
1246         fattr->time_start = jiffies;
1247         fattr->gencount = nfs_inc_attr_generation_counter();
1248         fattr->owner_name = NULL;
1249         fattr->group_name = NULL;
1250 }
1251 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1252 
1253 struct nfs_fattr *nfs_alloc_fattr(void)
1254 {
1255         struct nfs_fattr *fattr;
1256 
1257         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1258         if (fattr != NULL)
1259                 nfs_fattr_init(fattr);
1260         return fattr;
1261 }
1262 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1263 
1264 struct nfs_fh *nfs_alloc_fhandle(void)
1265 {
1266         struct nfs_fh *fh;
1267 
1268         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1269         if (fh != NULL)
1270                 fh->size = 0;
1271         return fh;
1272 }
1273 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1274 
1275 #ifdef NFS_DEBUG
1276 /*
1277  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1278  *                             in the same way that wireshark does
1279  *
1280  * @fh: file handle
1281  *
1282  * For debugging only.
1283  */
1284 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1285 {
1286         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1287          * not on the result */
1288         return nfs_fhandle_hash(fh);
1289 }
1290 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1291 
1292 /*
1293  * _nfs_display_fhandle - display an NFS file handle on the console
1294  *
1295  * @fh: file handle to display
1296  * @caption: display caption
1297  *
1298  * For debugging only.
1299  */
1300 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1301 {
1302         unsigned short i;
1303 
1304         if (fh == NULL || fh->size == 0) {
1305                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1306                 return;
1307         }
1308 
1309         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1310                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1311         for (i = 0; i < fh->size; i += 16) {
1312                 __be32 *pos = (__be32 *)&fh->data[i];
1313 
1314                 switch ((fh->size - i - 1) >> 2) {
1315                 case 0:
1316                         printk(KERN_DEFAULT " %08x\n",
1317                                 be32_to_cpup(pos));
1318                         break;
1319                 case 1:
1320                         printk(KERN_DEFAULT " %08x %08x\n",
1321                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1322                         break;
1323                 case 2:
1324                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1325                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1326                                 be32_to_cpup(pos + 2));
1327                         break;
1328                 default:
1329                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1330                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1331                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1332                 }
1333         }
1334 }
1335 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1336 #endif
1337 
1338 /**
1339  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1340  * @inode - pointer to inode
1341  * @fattr - attributes
1342  *
1343  * Attempt to divine whether or not an RPC call reply carrying stale
1344  * attributes got scheduled after another call carrying updated ones.
1345  *
1346  * To do so, the function first assumes that a more recent ctime means
1347  * that the attributes in fattr are newer, however it also attempt to
1348  * catch the case where ctime either didn't change, or went backwards
1349  * (if someone reset the clock on the server) by looking at whether
1350  * or not this RPC call was started after the inode was last updated.
1351  * Note also the check for wraparound of 'attr_gencount'
1352  *
1353  * The function returns 'true' if it thinks the attributes in 'fattr' are
1354  * more recent than the ones cached in the inode.
1355  *
1356  */
1357 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1358 {
1359         const struct nfs_inode *nfsi = NFS_I(inode);
1360 
1361         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1362                 nfs_ctime_need_update(inode, fattr) ||
1363                 nfs_size_need_update(inode, fattr) ||
1364                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1365 }
1366 
1367 /*
1368  * Don't trust the change_attribute, mtime, ctime or size if
1369  * a pnfs LAYOUTCOMMIT is outstanding
1370  */
1371 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1372                 struct nfs_fattr *fattr)
1373 {
1374         if (pnfs_layoutcommit_outstanding(inode))
1375                 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1376                                 NFS_ATTR_FATTR_MTIME |
1377                                 NFS_ATTR_FATTR_CTIME |
1378                                 NFS_ATTR_FATTR_SIZE);
1379 }
1380 
1381 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1382 {
1383         int ret;
1384 
1385         trace_nfs_refresh_inode_enter(inode);
1386 
1387         nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1388 
1389         if (nfs_inode_attrs_need_update(inode, fattr))
1390                 ret = nfs_update_inode(inode, fattr);
1391         else
1392                 ret = nfs_check_inode_attributes(inode, fattr);
1393 
1394         trace_nfs_refresh_inode_exit(inode, ret);
1395         return ret;
1396 }
1397 
1398 /**
1399  * nfs_refresh_inode - try to update the inode attribute cache
1400  * @inode - pointer to inode
1401  * @fattr - updated attributes
1402  *
1403  * Check that an RPC call that returned attributes has not overlapped with
1404  * other recent updates of the inode metadata, then decide whether it is
1405  * safe to do a full update of the inode attributes, or whether just to
1406  * call nfs_check_inode_attributes.
1407  */
1408 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1409 {
1410         int status;
1411 
1412         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1413                 return 0;
1414         spin_lock(&inode->i_lock);
1415         status = nfs_refresh_inode_locked(inode, fattr);
1416         spin_unlock(&inode->i_lock);
1417 
1418         return status;
1419 }
1420 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1421 
1422 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1423 {
1424         unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1425 
1426         if (S_ISDIR(inode->i_mode))
1427                 invalid |= NFS_INO_INVALID_DATA;
1428         nfs_set_cache_invalid(inode, invalid);
1429         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1430                 return 0;
1431         return nfs_refresh_inode_locked(inode, fattr);
1432 }
1433 
1434 /**
1435  * nfs_post_op_update_inode - try to update the inode attribute cache
1436  * @inode - pointer to inode
1437  * @fattr - updated attributes
1438  *
1439  * After an operation that has changed the inode metadata, mark the
1440  * attribute cache as being invalid, then try to update it.
1441  *
1442  * NB: if the server didn't return any post op attributes, this
1443  * function will force the retrieval of attributes before the next
1444  * NFS request.  Thus it should be used only for operations that
1445  * are expected to change one or more attributes, to avoid
1446  * unnecessary NFS requests and trips through nfs_update_inode().
1447  */
1448 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1449 {
1450         int status;
1451 
1452         spin_lock(&inode->i_lock);
1453         status = nfs_post_op_update_inode_locked(inode, fattr);
1454         spin_unlock(&inode->i_lock);
1455 
1456         return status;
1457 }
1458 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1459 
1460 /**
1461  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1462  * @inode - pointer to inode
1463  * @fattr - updated attributes
1464  *
1465  * After an operation that has changed the inode metadata, mark the
1466  * attribute cache as being invalid, then try to update it. Fake up
1467  * weak cache consistency data, if none exist.
1468  *
1469  * This function is mainly designed to be used by the ->write_done() functions.
1470  */
1471 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1472 {
1473         int status;
1474 
1475         spin_lock(&inode->i_lock);
1476         /* Don't do a WCC update if these attributes are already stale */
1477         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1478                         !nfs_inode_attrs_need_update(inode, fattr)) {
1479                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1480                                 | NFS_ATTR_FATTR_PRESIZE
1481                                 | NFS_ATTR_FATTR_PREMTIME
1482                                 | NFS_ATTR_FATTR_PRECTIME);
1483                 goto out_noforce;
1484         }
1485         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1486                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1487                 fattr->pre_change_attr = inode->i_version;
1488                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1489         }
1490         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1491                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1492                 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1493                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1494         }
1495         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1496                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1497                 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1498                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1499         }
1500         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1501                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1502                 fattr->pre_size = i_size_read(inode);
1503                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1504         }
1505 out_noforce:
1506         status = nfs_post_op_update_inode_locked(inode, fattr);
1507         spin_unlock(&inode->i_lock);
1508         return status;
1509 }
1510 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1511 
1512 /*
1513  * Many nfs protocol calls return the new file attributes after
1514  * an operation.  Here we update the inode to reflect the state
1515  * of the server's inode.
1516  *
1517  * This is a bit tricky because we have to make sure all dirty pages
1518  * have been sent off to the server before calling invalidate_inode_pages.
1519  * To make sure no other process adds more write requests while we try
1520  * our best to flush them, we make them sleep during the attribute refresh.
1521  *
1522  * A very similar scenario holds for the dir cache.
1523  */
1524 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1525 {
1526         struct nfs_server *server;
1527         struct nfs_inode *nfsi = NFS_I(inode);
1528         loff_t cur_isize, new_isize;
1529         unsigned long invalid = 0;
1530         unsigned long now = jiffies;
1531         unsigned long save_cache_validity;
1532 
1533         dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1534                         __func__, inode->i_sb->s_id, inode->i_ino,
1535                         nfs_display_fhandle_hash(NFS_FH(inode)),
1536                         atomic_read(&inode->i_count), fattr->valid);
1537 
1538         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1539                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1540                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1541                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1542                         inode->i_sb->s_id, (long long)nfsi->fileid,
1543                         (long long)fattr->fileid);
1544                 goto out_err;
1545         }
1546 
1547         /*
1548          * Make sure the inode's type hasn't changed.
1549          */
1550         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1551                 /*
1552                 * Big trouble! The inode has become a different object.
1553                 */
1554                 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1555                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1556                 goto out_err;
1557         }
1558 
1559         server = NFS_SERVER(inode);
1560         /* Update the fsid? */
1561         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1562                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1563                         !IS_AUTOMOUNT(inode))
1564                 server->fsid = fattr->fsid;
1565 
1566         /*
1567          * Update the read time so we don't revalidate too often.
1568          */
1569         nfsi->read_cache_jiffies = fattr->time_start;
1570 
1571         save_cache_validity = nfsi->cache_validity;
1572         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1573                         | NFS_INO_INVALID_ATIME
1574                         | NFS_INO_REVAL_FORCED
1575                         | NFS_INO_REVAL_PAGECACHE);
1576 
1577         /* Do atomic weak cache consistency updates */
1578         invalid |= nfs_wcc_update_inode(inode, fattr);
1579 
1580         /* More cache consistency checks */
1581         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1582                 if (inode->i_version != fattr->change_attr) {
1583                         dprintk("NFS: change_attr change on server for file %s/%ld\n",
1584                                         inode->i_sb->s_id, inode->i_ino);
1585                         invalid |= NFS_INO_INVALID_ATTR
1586                                 | NFS_INO_INVALID_DATA
1587                                 | NFS_INO_INVALID_ACCESS
1588                                 | NFS_INO_INVALID_ACL
1589                                 | NFS_INO_REVAL_PAGECACHE;
1590                         if (S_ISDIR(inode->i_mode))
1591                                 nfs_force_lookup_revalidate(inode);
1592                         inode->i_version = fattr->change_attr;
1593                 }
1594         } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1595                 nfsi->cache_validity |= save_cache_validity;
1596 
1597         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1598                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1599         } else if (server->caps & NFS_CAP_MTIME)
1600                 nfsi->cache_validity |= save_cache_validity &
1601                                 (NFS_INO_INVALID_ATTR
1602                                 | NFS_INO_REVAL_FORCED);
1603 
1604         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1605                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1606         } else if (server->caps & NFS_CAP_CTIME)
1607                 nfsi->cache_validity |= save_cache_validity &
1608                                 (NFS_INO_INVALID_ATTR
1609                                 | NFS_INO_REVAL_FORCED);
1610 
1611         /* Check if our cached file size is stale */
1612         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1613                 new_isize = nfs_size_to_loff_t(fattr->size);
1614                 cur_isize = i_size_read(inode);
1615                 if (new_isize != cur_isize) {
1616                         /* Do we perhaps have any outstanding writes, or has
1617                          * the file grown beyond our last write? */
1618                         if ((nfsi->npages == 0) || new_isize > cur_isize) {
1619                                 i_size_write(inode, new_isize);
1620                                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1621                                 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1622                         }
1623                         dprintk("NFS: isize change on server for file %s/%ld "
1624                                         "(%Ld to %Ld)\n",
1625                                         inode->i_sb->s_id,
1626                                         inode->i_ino,
1627                                         (long long)cur_isize,
1628                                         (long long)new_isize);
1629                 }
1630         } else
1631                 nfsi->cache_validity |= save_cache_validity &
1632                                 (NFS_INO_INVALID_ATTR
1633                                 | NFS_INO_REVAL_PAGECACHE
1634                                 | NFS_INO_REVAL_FORCED);
1635 
1636 
1637         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1638                 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1639         else if (server->caps & NFS_CAP_ATIME)
1640                 nfsi->cache_validity |= save_cache_validity &
1641                                 (NFS_INO_INVALID_ATIME
1642                                 | NFS_INO_REVAL_FORCED);
1643 
1644         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1645                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1646                         umode_t newmode = inode->i_mode & S_IFMT;
1647                         newmode |= fattr->mode & S_IALLUGO;
1648                         inode->i_mode = newmode;
1649                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1650                 }
1651         } else if (server->caps & NFS_CAP_MODE)
1652                 nfsi->cache_validity |= save_cache_validity &
1653                                 (NFS_INO_INVALID_ATTR
1654                                 | NFS_INO_INVALID_ACCESS
1655                                 | NFS_INO_INVALID_ACL
1656                                 | NFS_INO_REVAL_FORCED);
1657 
1658         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1659                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1660                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1661                         inode->i_uid = fattr->uid;
1662                 }
1663         } else if (server->caps & NFS_CAP_OWNER)
1664                 nfsi->cache_validity |= save_cache_validity &
1665                                 (NFS_INO_INVALID_ATTR
1666                                 | NFS_INO_INVALID_ACCESS
1667                                 | NFS_INO_INVALID_ACL
1668                                 | NFS_INO_REVAL_FORCED);
1669 
1670         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1671                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1672                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1673                         inode->i_gid = fattr->gid;
1674                 }
1675         } else if (server->caps & NFS_CAP_OWNER_GROUP)
1676                 nfsi->cache_validity |= save_cache_validity &
1677                                 (NFS_INO_INVALID_ATTR
1678                                 | NFS_INO_INVALID_ACCESS
1679                                 | NFS_INO_INVALID_ACL
1680                                 | NFS_INO_REVAL_FORCED);
1681 
1682         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1683                 if (inode->i_nlink != fattr->nlink) {
1684                         invalid |= NFS_INO_INVALID_ATTR;
1685                         if (S_ISDIR(inode->i_mode))
1686                                 invalid |= NFS_INO_INVALID_DATA;
1687                         set_nlink(inode, fattr->nlink);
1688                 }
1689         } else if (server->caps & NFS_CAP_NLINK)
1690                 nfsi->cache_validity |= save_cache_validity &
1691                                 (NFS_INO_INVALID_ATTR
1692                                 | NFS_INO_REVAL_FORCED);
1693 
1694         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1695                 /*
1696                  * report the blocks in 512byte units
1697                  */
1698                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1699         }
1700         if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1701                 inode->i_blocks = fattr->du.nfs2.blocks;
1702 
1703         /* Update attrtimeo value if we're out of the unstable period */
1704         if (invalid & NFS_INO_INVALID_ATTR) {
1705                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1706                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1707                 nfsi->attrtimeo_timestamp = now;
1708                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1709         } else {
1710                 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1711                         if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1712                                 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1713                         nfsi->attrtimeo_timestamp = now;
1714                 }
1715         }
1716         invalid &= ~NFS_INO_INVALID_ATTR;
1717         /* Don't invalidate the data if we were to blame */
1718         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1719                                 || S_ISLNK(inode->i_mode)))
1720                 invalid &= ~NFS_INO_INVALID_DATA;
1721         if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1722                         (save_cache_validity & NFS_INO_REVAL_FORCED))
1723                 nfs_set_cache_invalid(inode, invalid);
1724 
1725         return 0;
1726  out_err:
1727         /*
1728          * No need to worry about unhashing the dentry, as the
1729          * lookup validation will know that the inode is bad.
1730          * (But we fall through to invalidate the caches.)
1731          */
1732         nfs_invalidate_inode(inode);
1733         return -ESTALE;
1734 }
1735 
1736 struct inode *nfs_alloc_inode(struct super_block *sb)
1737 {
1738         struct nfs_inode *nfsi;
1739         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1740         if (!nfsi)
1741                 return NULL;
1742         nfsi->flags = 0UL;
1743         nfsi->cache_validity = 0UL;
1744 #if IS_ENABLED(CONFIG_NFS_V4)
1745         nfsi->nfs4_acl = NULL;
1746 #endif /* CONFIG_NFS_V4 */
1747         return &nfsi->vfs_inode;
1748 }
1749 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1750 
1751 static void nfs_i_callback(struct rcu_head *head)
1752 {
1753         struct inode *inode = container_of(head, struct inode, i_rcu);
1754         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1755 }
1756 
1757 void nfs_destroy_inode(struct inode *inode)
1758 {
1759         call_rcu(&inode->i_rcu, nfs_i_callback);
1760 }
1761 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1762 
1763 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1764 {
1765 #if IS_ENABLED(CONFIG_NFS_V4)
1766         INIT_LIST_HEAD(&nfsi->open_states);
1767         nfsi->delegation = NULL;
1768         nfsi->delegation_state = 0;
1769         init_rwsem(&nfsi->rwsem);
1770         nfsi->layout = NULL;
1771 #endif
1772 }
1773 
1774 static void init_once(void *foo)
1775 {
1776         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1777 
1778         inode_init_once(&nfsi->vfs_inode);
1779         INIT_LIST_HEAD(&nfsi->open_files);
1780         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1781         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1782         INIT_LIST_HEAD(&nfsi->commit_info.list);
1783         nfsi->npages = 0;
1784         nfsi->commit_info.ncommit = 0;
1785         atomic_set(&nfsi->commit_info.rpcs_out, 0);
1786         atomic_set(&nfsi->silly_count, 1);
1787         INIT_HLIST_HEAD(&nfsi->silly_list);
1788         init_waitqueue_head(&nfsi->waitqueue);
1789         nfs4_init_once(nfsi);
1790 }
1791 
1792 static int __init nfs_init_inodecache(void)
1793 {
1794         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1795                                              sizeof(struct nfs_inode),
1796                                              0, (SLAB_RECLAIM_ACCOUNT|
1797                                                 SLAB_MEM_SPREAD),
1798                                              init_once);
1799         if (nfs_inode_cachep == NULL)
1800                 return -ENOMEM;
1801 
1802         return 0;
1803 }
1804 
1805 static void nfs_destroy_inodecache(void)
1806 {
1807         /*
1808          * Make sure all delayed rcu free inodes are flushed before we
1809          * destroy cache.
1810          */
1811         rcu_barrier();
1812         kmem_cache_destroy(nfs_inode_cachep);
1813 }
1814 
1815 struct workqueue_struct *nfsiod_workqueue;
1816 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1817 
1818 /*
1819  * start up the nfsiod workqueue
1820  */
1821 static int nfsiod_start(void)
1822 {
1823         struct workqueue_struct *wq;
1824         dprintk("RPC:       creating workqueue nfsiod\n");
1825         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1826         if (wq == NULL)
1827                 return -ENOMEM;
1828         nfsiod_workqueue = wq;
1829         return 0;
1830 }
1831 
1832 /*
1833  * Destroy the nfsiod workqueue
1834  */
1835 static void nfsiod_stop(void)
1836 {
1837         struct workqueue_struct *wq;
1838 
1839         wq = nfsiod_workqueue;
1840         if (wq == NULL)
1841                 return;
1842         nfsiod_workqueue = NULL;
1843         destroy_workqueue(wq);
1844 }
1845 
1846 int nfs_net_id;
1847 EXPORT_SYMBOL_GPL(nfs_net_id);
1848 
1849 static int nfs_net_init(struct net *net)
1850 {
1851         nfs_clients_init(net);
1852         return nfs_fs_proc_net_init(net);
1853 }
1854 
1855 static void nfs_net_exit(struct net *net)
1856 {
1857         nfs_fs_proc_net_exit(net);
1858         nfs_cleanup_cb_ident_idr(net);
1859 }
1860 
1861 static struct pernet_operations nfs_net_ops = {
1862         .init = nfs_net_init,
1863         .exit = nfs_net_exit,
1864         .id   = &nfs_net_id,
1865         .size = sizeof(struct nfs_net),
1866 };
1867 
1868 /*
1869  * Initialize NFS
1870  */
1871 static int __init init_nfs_fs(void)
1872 {
1873         int err;
1874 
1875         err = register_pernet_subsys(&nfs_net_ops);
1876         if (err < 0)
1877                 goto out9;
1878 
1879         err = nfs_fscache_register();
1880         if (err < 0)
1881                 goto out8;
1882 
1883         err = nfsiod_start();
1884         if (err)
1885                 goto out7;
1886 
1887         err = nfs_fs_proc_init();
1888         if (err)
1889                 goto out6;
1890 
1891         err = nfs_init_nfspagecache();
1892         if (err)
1893                 goto out5;
1894 
1895         err = nfs_init_inodecache();
1896         if (err)
1897                 goto out4;
1898 
1899         err = nfs_init_readpagecache();
1900         if (err)
1901                 goto out3;
1902 
1903         err = nfs_init_writepagecache();
1904         if (err)
1905                 goto out2;
1906 
1907         err = nfs_init_directcache();
1908         if (err)
1909                 goto out1;
1910 
1911 #ifdef CONFIG_PROC_FS
1912         rpc_proc_register(&init_net, &nfs_rpcstat);
1913 #endif
1914         if ((err = register_nfs_fs()) != 0)
1915                 goto out0;
1916 
1917         return 0;
1918 out0:
1919 #ifdef CONFIG_PROC_FS
1920         rpc_proc_unregister(&init_net, "nfs");
1921 #endif
1922         nfs_destroy_directcache();
1923 out1:
1924         nfs_destroy_writepagecache();
1925 out2:
1926         nfs_destroy_readpagecache();
1927 out3:
1928         nfs_destroy_inodecache();
1929 out4:
1930         nfs_destroy_nfspagecache();
1931 out5:
1932         nfs_fs_proc_exit();
1933 out6:
1934         nfsiod_stop();
1935 out7:
1936         nfs_fscache_unregister();
1937 out8:
1938         unregister_pernet_subsys(&nfs_net_ops);
1939 out9:
1940         return err;
1941 }
1942 
1943 static void __exit exit_nfs_fs(void)
1944 {
1945         nfs_destroy_directcache();
1946         nfs_destroy_writepagecache();
1947         nfs_destroy_readpagecache();
1948         nfs_destroy_inodecache();
1949         nfs_destroy_nfspagecache();
1950         nfs_fscache_unregister();
1951         unregister_pernet_subsys(&nfs_net_ops);
1952 #ifdef CONFIG_PROC_FS
1953         rpc_proc_unregister(&init_net, "nfs");
1954 #endif
1955         unregister_nfs_fs();
1956         nfs_fs_proc_exit();
1957         nfsiod_stop();
1958 }
1959 
1960 /* Not quite true; I just maintain it */
1961 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1962 MODULE_LICENSE("GPL");
1963 module_param(enable_ino64, bool, 0644);
1964 
1965 module_init(init_nfs_fs)
1966 module_exit(exit_nfs_fs)
1967 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us