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

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  1 /*
  2  *  linux/fs/nfs/inode.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  *
  6  *  nfs inode and superblock handling functions
  7  *
  8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 10  *
 11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 12  *  J.S.Peatfield@damtp.cam.ac.uk
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/init.h>
 18 #include <linux/sched.h>
 19 #include <linux/time.h>
 20 #include <linux/kernel.h>
 21 #include <linux/mm.h>
 22 #include <linux/string.h>
 23 #include <linux/stat.h>
 24 #include <linux/errno.h>
 25 #include <linux/unistd.h>
 26 #include <linux/sunrpc/clnt.h>
 27 #include <linux/sunrpc/stats.h>
 28 #include <linux/sunrpc/metrics.h>
 29 #include <linux/nfs_fs.h>
 30 #include <linux/nfs_mount.h>
 31 #include <linux/nfs4_mount.h>
 32 #include <linux/lockd/bind.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/mount.h>
 35 #include <linux/vfs.h>
 36 #include <linux/inet.h>
 37 #include <linux/nfs_xdr.h>
 38 #include <linux/slab.h>
 39 #include <linux/compat.h>
 40 #include <linux/freezer.h>
 41 #include <linux/crc32.h>
 42 
 43 #include <asm/uaccess.h>
 44 
 45 #include "nfs4_fs.h"
 46 #include "callback.h"
 47 #include "delegation.h"
 48 #include "iostat.h"
 49 #include "internal.h"
 50 #include "fscache.h"
 51 #include "pnfs.h"
 52 #include "nfs.h"
 53 #include "netns.h"
 54 
 55 #define NFSDBG_FACILITY         NFSDBG_VFS
 56 
 57 #define NFS_64_BIT_INODE_NUMBERS_ENABLED        1
 58 
 59 /* Default is to see 64-bit inode numbers */
 60 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
 61 
 62 static void nfs_invalidate_inode(struct inode *);
 63 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
 64 
 65 static struct kmem_cache * nfs_inode_cachep;
 66 
 67 static inline unsigned long
 68 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
 69 {
 70         return nfs_fileid_to_ino_t(fattr->fileid);
 71 }
 72 
 73 /**
 74  * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
 75  * @word: long word containing the bit lock
 76  */
 77 int nfs_wait_bit_killable(void *word)
 78 {
 79         if (fatal_signal_pending(current))
 80                 return -ERESTARTSYS;
 81         freezable_schedule_unsafe();
 82         return 0;
 83 }
 84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
 85 
 86 /**
 87  * nfs_compat_user_ino64 - returns the user-visible inode number
 88  * @fileid: 64-bit fileid
 89  *
 90  * This function returns a 32-bit inode number if the boot parameter
 91  * nfs.enable_ino64 is zero.
 92  */
 93 u64 nfs_compat_user_ino64(u64 fileid)
 94 {
 95 #ifdef CONFIG_COMPAT
 96         compat_ulong_t ino;
 97 #else   
 98         unsigned long ino;
 99 #endif
100 
101         if (enable_ino64)
102                 return fileid;
103         ino = fileid;
104         if (sizeof(ino) < sizeof(fileid))
105                 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
106         return ino;
107 }
108 
109 int nfs_drop_inode(struct inode *inode)
110 {
111         return NFS_STALE(inode) || generic_drop_inode(inode);
112 }
113 EXPORT_SYMBOL_GPL(nfs_drop_inode);
114 
115 void nfs_clear_inode(struct inode *inode)
116 {
117         /*
118          * The following should never happen...
119          */
120         WARN_ON_ONCE(nfs_have_writebacks(inode));
121         WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
122         nfs_zap_acl_cache(inode);
123         nfs_access_zap_cache(inode);
124         nfs_fscache_release_inode_cookie(inode);
125 }
126 EXPORT_SYMBOL_GPL(nfs_clear_inode);
127 
128 void nfs_evict_inode(struct inode *inode)
129 {
130         truncate_inode_pages(&inode->i_data, 0);
131         clear_inode(inode);
132         nfs_clear_inode(inode);
133 }
134 
135 /**
136  * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
137  */
138 int nfs_sync_mapping(struct address_space *mapping)
139 {
140         int ret = 0;
141 
142         if (mapping->nrpages != 0) {
143                 unmap_mapping_range(mapping, 0, 0, 0);
144                 ret = nfs_wb_all(mapping->host);
145         }
146         return ret;
147 }
148 
149 /*
150  * Invalidate the local caches
151  */
152 static void nfs_zap_caches_locked(struct inode *inode)
153 {
154         struct nfs_inode *nfsi = NFS_I(inode);
155         int mode = inode->i_mode;
156 
157         nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
158 
159         nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
160         nfsi->attrtimeo_timestamp = jiffies;
161 
162         memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
163         if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
164                 nfs_fscache_invalidate(inode);
165                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
166                                         | NFS_INO_INVALID_LABEL
167                                         | NFS_INO_INVALID_DATA
168                                         | NFS_INO_INVALID_ACCESS
169                                         | NFS_INO_INVALID_ACL
170                                         | NFS_INO_REVAL_PAGECACHE;
171         } else
172                 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
173                                         | NFS_INO_INVALID_LABEL
174                                         | NFS_INO_INVALID_ACCESS
175                                         | NFS_INO_INVALID_ACL
176                                         | NFS_INO_REVAL_PAGECACHE;
177 }
178 
179 void nfs_zap_caches(struct inode *inode)
180 {
181         spin_lock(&inode->i_lock);
182         nfs_zap_caches_locked(inode);
183         spin_unlock(&inode->i_lock);
184 }
185 
186 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
187 {
188         if (mapping->nrpages != 0) {
189                 spin_lock(&inode->i_lock);
190                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
191                 nfs_fscache_invalidate(inode);
192                 spin_unlock(&inode->i_lock);
193         }
194 }
195 
196 void nfs_zap_acl_cache(struct inode *inode)
197 {
198         void (*clear_acl_cache)(struct inode *);
199 
200         clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
201         if (clear_acl_cache != NULL)
202                 clear_acl_cache(inode);
203         spin_lock(&inode->i_lock);
204         NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
205         spin_unlock(&inode->i_lock);
206 }
207 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
208 
209 void nfs_invalidate_atime(struct inode *inode)
210 {
211         spin_lock(&inode->i_lock);
212         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
213         spin_unlock(&inode->i_lock);
214 }
215 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
216 
217 /*
218  * Invalidate, but do not unhash, the inode.
219  * NB: must be called with inode->i_lock held!
220  */
221 static void nfs_invalidate_inode(struct inode *inode)
222 {
223         set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
224         nfs_zap_caches_locked(inode);
225 }
226 
227 struct nfs_find_desc {
228         struct nfs_fh           *fh;
229         struct nfs_fattr        *fattr;
230 };
231 
232 /*
233  * In NFSv3 we can have 64bit inode numbers. In order to support
234  * this, and re-exported directories (also seen in NFSv2)
235  * we are forced to allow 2 different inodes to have the same
236  * i_ino.
237  */
238 static int
239 nfs_find_actor(struct inode *inode, void *opaque)
240 {
241         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
242         struct nfs_fh           *fh = desc->fh;
243         struct nfs_fattr        *fattr = desc->fattr;
244 
245         if (NFS_FILEID(inode) != fattr->fileid)
246                 return 0;
247         if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
248                 return 0;
249         if (nfs_compare_fh(NFS_FH(inode), fh))
250                 return 0;
251         if (is_bad_inode(inode) || NFS_STALE(inode))
252                 return 0;
253         return 1;
254 }
255 
256 static int
257 nfs_init_locked(struct inode *inode, void *opaque)
258 {
259         struct nfs_find_desc    *desc = (struct nfs_find_desc *)opaque;
260         struct nfs_fattr        *fattr = desc->fattr;
261 
262         set_nfs_fileid(inode, fattr->fileid);
263         nfs_copy_fh(NFS_FH(inode), desc->fh);
264         return 0;
265 }
266 
267 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
268 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
269                                         struct nfs4_label *label)
270 {
271         int error;
272 
273         if (label == NULL)
274                 return;
275 
276         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL) == 0)
277                 return;
278 
279         if (NFS_SERVER(inode)->nfs_client->cl_minorversion < 2)
280                 return;
281 
282         if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
283                 error = security_inode_notifysecctx(inode, label->label,
284                                 label->len);
285                 if (error)
286                         printk(KERN_ERR "%s() %s %d "
287                                         "security_inode_notifysecctx() %d\n",
288                                         __func__,
289                                         (char *)label->label,
290                                         label->len, error);
291         }
292 }
293 
294 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
295 {
296         struct nfs4_label *label = NULL;
297         int minor_version = server->nfs_client->cl_minorversion;
298 
299         if (minor_version < 2)
300                 return label;
301 
302         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
303                 return label;
304 
305         label = kzalloc(sizeof(struct nfs4_label), flags);
306         if (label == NULL)
307                 return ERR_PTR(-ENOMEM);
308 
309         label->label = kzalloc(NFS4_MAXLABELLEN, flags);
310         if (label->label == NULL) {
311                 kfree(label);
312                 return ERR_PTR(-ENOMEM);
313         }
314         label->len = NFS4_MAXLABELLEN;
315 
316         return label;
317 }
318 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
319 #else
320 void inline nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
321                                         struct nfs4_label *label)
322 {
323 }
324 #endif
325 EXPORT_SYMBOL_GPL(nfs_setsecurity);
326 
327 /*
328  * This is our front-end to iget that looks up inodes by file handle
329  * instead of inode number.
330  */
331 struct inode *
332 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
333 {
334         struct nfs_find_desc desc = {
335                 .fh     = fh,
336                 .fattr  = fattr
337         };
338         struct inode *inode = ERR_PTR(-ENOENT);
339         unsigned long hash;
340 
341         nfs_attr_check_mountpoint(sb, fattr);
342 
343         if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
344             !nfs_attr_use_mounted_on_fileid(fattr))
345                 goto out_no_inode;
346         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
347                 goto out_no_inode;
348 
349         hash = nfs_fattr_to_ino_t(fattr);
350 
351         inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
352         if (inode == NULL) {
353                 inode = ERR_PTR(-ENOMEM);
354                 goto out_no_inode;
355         }
356 
357         if (inode->i_state & I_NEW) {
358                 struct nfs_inode *nfsi = NFS_I(inode);
359                 unsigned long now = jiffies;
360 
361                 /* We set i_ino for the few things that still rely on it,
362                  * such as stat(2) */
363                 inode->i_ino = hash;
364 
365                 /* We can't support update_atime(), since the server will reset it */
366                 inode->i_flags |= S_NOATIME|S_NOCMTIME;
367                 inode->i_mode = fattr->mode;
368                 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
369                                 && nfs_server_capable(inode, NFS_CAP_MODE))
370                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
371                 /* Why so? Because we want revalidate for devices/FIFOs, and
372                  * that's precisely what we have in nfs_file_inode_operations.
373                  */
374                 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
375                 if (S_ISREG(inode->i_mode)) {
376                         inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
377                         inode->i_data.a_ops = &nfs_file_aops;
378                         inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
379                 } else if (S_ISDIR(inode->i_mode)) {
380                         inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
381                         inode->i_fop = &nfs_dir_operations;
382                         inode->i_data.a_ops = &nfs_dir_aops;
383                         /* Deal with crossing mountpoints */
384                         if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
385                                         fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
386                                 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
387                                         inode->i_op = &nfs_referral_inode_operations;
388                                 else
389                                         inode->i_op = &nfs_mountpoint_inode_operations;
390                                 inode->i_fop = NULL;
391                                 inode->i_flags |= S_AUTOMOUNT;
392                         }
393                 } else if (S_ISLNK(inode->i_mode))
394                         inode->i_op = &nfs_symlink_inode_operations;
395                 else
396                         init_special_inode(inode, inode->i_mode, fattr->rdev);
397 
398                 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
399                 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
400                 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
401                 inode->i_version = 0;
402                 inode->i_size = 0;
403                 clear_nlink(inode);
404                 inode->i_uid = make_kuid(&init_user_ns, -2);
405                 inode->i_gid = make_kgid(&init_user_ns, -2);
406                 inode->i_blocks = 0;
407                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
408                 nfsi->write_io = 0;
409                 nfsi->read_io = 0;
410 
411                 nfsi->read_cache_jiffies = fattr->time_start;
412                 nfsi->attr_gencount = fattr->gencount;
413                 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
414                         inode->i_atime = fattr->atime;
415                 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
416                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
417                 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
418                         inode->i_mtime = fattr->mtime;
419                 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
420                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
421                 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
422                         inode->i_ctime = fattr->ctime;
423                 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
424                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
425                 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
426                         inode->i_version = fattr->change_attr;
427                 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
428                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
429                 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
430                         inode->i_size = nfs_size_to_loff_t(fattr->size);
431                 else
432                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR
433                                 | NFS_INO_REVAL_PAGECACHE;
434                 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
435                         set_nlink(inode, fattr->nlink);
436                 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
437                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
438                 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
439                         inode->i_uid = fattr->uid;
440                 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
441                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
442                 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
443                         inode->i_gid = fattr->gid;
444                 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
445                         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
446                 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
447                         inode->i_blocks = fattr->du.nfs2.blocks;
448                 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
449                         /*
450                          * report the blocks in 512byte units
451                          */
452                         inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
453                 }
454 
455                 nfs_setsecurity(inode, fattr, label);
456 
457                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
458                 nfsi->attrtimeo_timestamp = now;
459                 nfsi->access_cache = RB_ROOT;
460 
461                 nfs_fscache_init_inode_cookie(inode);
462 
463                 unlock_new_inode(inode);
464         } else
465                 nfs_refresh_inode(inode, fattr);
466         dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
467                 inode->i_sb->s_id,
468                 (long long)NFS_FILEID(inode),
469                 nfs_display_fhandle_hash(fh),
470                 atomic_read(&inode->i_count));
471 
472 out:
473         return inode;
474 
475 out_no_inode:
476         dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
477         goto out;
478 }
479 EXPORT_SYMBOL_GPL(nfs_fhget);
480 
481 #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)
482 
483 int
484 nfs_setattr(struct dentry *dentry, struct iattr *attr)
485 {
486         struct inode *inode = dentry->d_inode;
487         struct nfs_fattr *fattr;
488         int error = -ENOMEM;
489 
490         nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
491 
492         /* skip mode change if it's just for clearing setuid/setgid */
493         if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
494                 attr->ia_valid &= ~ATTR_MODE;
495 
496         if (attr->ia_valid & ATTR_SIZE) {
497                 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
498                         attr->ia_valid &= ~ATTR_SIZE;
499         }
500 
501         /* Optimization: if the end result is no change, don't RPC */
502         attr->ia_valid &= NFS_VALID_ATTRS;
503         if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
504                 return 0;
505 
506         /* Write all dirty data */
507         if (S_ISREG(inode->i_mode)) {
508                 nfs_inode_dio_wait(inode);
509                 nfs_wb_all(inode);
510         }
511 
512         fattr = nfs_alloc_fattr();
513         if (fattr == NULL)
514                 goto out;
515         /*
516          * Return any delegations if we're going to change ACLs
517          */
518         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
519                 NFS_PROTO(inode)->return_delegation(inode);
520         error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
521         if (error == 0)
522                 error = nfs_refresh_inode(inode, fattr);
523         nfs_free_fattr(fattr);
524 out:
525         return error;
526 }
527 EXPORT_SYMBOL_GPL(nfs_setattr);
528 
529 /**
530  * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
531  * @inode: inode of the file used
532  * @offset: file offset to start truncating
533  *
534  * This is a copy of the common vmtruncate, but with the locking
535  * corrected to take into account the fact that NFS requires
536  * inode->i_size to be updated under the inode->i_lock.
537  */
538 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
539 {
540         loff_t oldsize;
541         int err;
542 
543         err = inode_newsize_ok(inode, offset);
544         if (err)
545                 goto out;
546 
547         spin_lock(&inode->i_lock);
548         oldsize = inode->i_size;
549         i_size_write(inode, offset);
550         spin_unlock(&inode->i_lock);
551 
552         truncate_pagecache(inode, oldsize, offset);
553 out:
554         return err;
555 }
556 
557 /**
558  * nfs_setattr_update_inode - Update inode metadata after a setattr call.
559  * @inode: pointer to struct inode
560  * @attr: pointer to struct iattr
561  *
562  * Note: we do this in the *proc.c in order to ensure that
563  *       it works for things like exclusive creates too.
564  */
565 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
566 {
567         if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
568                 spin_lock(&inode->i_lock);
569                 if ((attr->ia_valid & ATTR_MODE) != 0) {
570                         int mode = attr->ia_mode & S_IALLUGO;
571                         mode |= inode->i_mode & ~S_IALLUGO;
572                         inode->i_mode = mode;
573                 }
574                 if ((attr->ia_valid & ATTR_UID) != 0)
575                         inode->i_uid = attr->ia_uid;
576                 if ((attr->ia_valid & ATTR_GID) != 0)
577                         inode->i_gid = attr->ia_gid;
578                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
579                 spin_unlock(&inode->i_lock);
580         }
581         if ((attr->ia_valid & ATTR_SIZE) != 0) {
582                 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
583                 nfs_vmtruncate(inode, attr->ia_size);
584         }
585 }
586 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
587 
588 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
589 {
590         struct inode *inode = dentry->d_inode;
591         int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
592         int err;
593 
594         /* Flush out writes to the server in order to update c/mtime.  */
595         if (S_ISREG(inode->i_mode)) {
596                 nfs_inode_dio_wait(inode);
597                 err = filemap_write_and_wait(inode->i_mapping);
598                 if (err)
599                         goto out;
600         }
601 
602         /*
603          * We may force a getattr if the user cares about atime.
604          *
605          * Note that we only have to check the vfsmount flags here:
606          *  - NFS always sets S_NOATIME by so checking it would give a
607          *    bogus result
608          *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
609          *    no point in checking those.
610          */
611         if ((mnt->mnt_flags & MNT_NOATIME) ||
612             ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
613                 need_atime = 0;
614 
615         if (need_atime)
616                 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
617         else
618                 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
619         if (!err) {
620                 generic_fillattr(inode, stat);
621                 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
622         }
623 out:
624         return err;
625 }
626 EXPORT_SYMBOL_GPL(nfs_getattr);
627 
628 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
629 {
630         atomic_set(&l_ctx->count, 1);
631         l_ctx->lockowner.l_owner = current->files;
632         l_ctx->lockowner.l_pid = current->tgid;
633         INIT_LIST_HEAD(&l_ctx->list);
634         nfs_iocounter_init(&l_ctx->io_count);
635 }
636 
637 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
638 {
639         struct nfs_lock_context *head = &ctx->lock_context;
640         struct nfs_lock_context *pos = head;
641 
642         do {
643                 if (pos->lockowner.l_owner != current->files)
644                         continue;
645                 if (pos->lockowner.l_pid != current->tgid)
646                         continue;
647                 atomic_inc(&pos->count);
648                 return pos;
649         } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
650         return NULL;
651 }
652 
653 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
654 {
655         struct nfs_lock_context *res, *new = NULL;
656         struct inode *inode = ctx->dentry->d_inode;
657 
658         spin_lock(&inode->i_lock);
659         res = __nfs_find_lock_context(ctx);
660         if (res == NULL) {
661                 spin_unlock(&inode->i_lock);
662                 new = kmalloc(sizeof(*new), GFP_KERNEL);
663                 if (new == NULL)
664                         return ERR_PTR(-ENOMEM);
665                 nfs_init_lock_context(new);
666                 spin_lock(&inode->i_lock);
667                 res = __nfs_find_lock_context(ctx);
668                 if (res == NULL) {
669                         list_add_tail(&new->list, &ctx->lock_context.list);
670                         new->open_context = ctx;
671                         res = new;
672                         new = NULL;
673                 }
674         }
675         spin_unlock(&inode->i_lock);
676         kfree(new);
677         return res;
678 }
679 
680 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
681 {
682         struct nfs_open_context *ctx = l_ctx->open_context;
683         struct inode *inode = ctx->dentry->d_inode;
684 
685         if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
686                 return;
687         list_del(&l_ctx->list);
688         spin_unlock(&inode->i_lock);
689         kfree(l_ctx);
690 }
691 
692 /**
693  * nfs_close_context - Common close_context() routine NFSv2/v3
694  * @ctx: pointer to context
695  * @is_sync: is this a synchronous close
696  *
697  * always ensure that the attributes are up to date if we're mounted
698  * with close-to-open semantics
699  */
700 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
701 {
702         struct inode *inode;
703         struct nfs_server *server;
704 
705         if (!(ctx->mode & FMODE_WRITE))
706                 return;
707         if (!is_sync)
708                 return;
709         inode = ctx->dentry->d_inode;
710         if (!list_empty(&NFS_I(inode)->open_files))
711                 return;
712         server = NFS_SERVER(inode);
713         if (server->flags & NFS_MOUNT_NOCTO)
714                 return;
715         nfs_revalidate_inode(server, inode);
716 }
717 EXPORT_SYMBOL_GPL(nfs_close_context);
718 
719 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
720 {
721         struct nfs_open_context *ctx;
722         struct rpc_cred *cred = rpc_lookup_cred();
723         if (IS_ERR(cred))
724                 return ERR_CAST(cred);
725 
726         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
727         if (!ctx) {
728                 put_rpccred(cred);
729                 return ERR_PTR(-ENOMEM);
730         }
731         nfs_sb_active(dentry->d_sb);
732         ctx->dentry = dget(dentry);
733         ctx->cred = cred;
734         ctx->state = NULL;
735         ctx->mode = f_mode;
736         ctx->flags = 0;
737         ctx->error = 0;
738         nfs_init_lock_context(&ctx->lock_context);
739         ctx->lock_context.open_context = ctx;
740         INIT_LIST_HEAD(&ctx->list);
741         ctx->mdsthreshold = NULL;
742         return ctx;
743 }
744 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
745 
746 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
747 {
748         if (ctx != NULL)
749                 atomic_inc(&ctx->lock_context.count);
750         return ctx;
751 }
752 EXPORT_SYMBOL_GPL(get_nfs_open_context);
753 
754 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
755 {
756         struct inode *inode = ctx->dentry->d_inode;
757         struct super_block *sb = ctx->dentry->d_sb;
758 
759         if (!list_empty(&ctx->list)) {
760                 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
761                         return;
762                 list_del(&ctx->list);
763                 spin_unlock(&inode->i_lock);
764         } else if (!atomic_dec_and_test(&ctx->lock_context.count))
765                 return;
766         if (inode != NULL)
767                 NFS_PROTO(inode)->close_context(ctx, is_sync);
768         if (ctx->cred != NULL)
769                 put_rpccred(ctx->cred);
770         dput(ctx->dentry);
771         nfs_sb_deactive(sb);
772         kfree(ctx->mdsthreshold);
773         kfree(ctx);
774 }
775 
776 void put_nfs_open_context(struct nfs_open_context *ctx)
777 {
778         __put_nfs_open_context(ctx, 0);
779 }
780 EXPORT_SYMBOL_GPL(put_nfs_open_context);
781 
782 /*
783  * Ensure that mmap has a recent RPC credential for use when writing out
784  * shared pages
785  */
786 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
787 {
788         struct inode *inode = ctx->dentry->d_inode;
789         struct nfs_inode *nfsi = NFS_I(inode);
790 
791         spin_lock(&inode->i_lock);
792         list_add(&ctx->list, &nfsi->open_files);
793         spin_unlock(&inode->i_lock);
794 }
795 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
796 
797 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
798 {
799         filp->private_data = get_nfs_open_context(ctx);
800         if (list_empty(&ctx->list))
801                 nfs_inode_attach_open_context(ctx);
802 }
803 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
804 
805 /*
806  * Given an inode, search for an open context with the desired characteristics
807  */
808 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
809 {
810         struct nfs_inode *nfsi = NFS_I(inode);
811         struct nfs_open_context *pos, *ctx = NULL;
812 
813         spin_lock(&inode->i_lock);
814         list_for_each_entry(pos, &nfsi->open_files, list) {
815                 if (cred != NULL && pos->cred != cred)
816                         continue;
817                 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
818                         continue;
819                 ctx = get_nfs_open_context(pos);
820                 break;
821         }
822         spin_unlock(&inode->i_lock);
823         return ctx;
824 }
825 
826 static void nfs_file_clear_open_context(struct file *filp)
827 {
828         struct nfs_open_context *ctx = nfs_file_open_context(filp);
829 
830         if (ctx) {
831                 struct inode *inode = ctx->dentry->d_inode;
832 
833                 filp->private_data = NULL;
834                 spin_lock(&inode->i_lock);
835                 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
836                 spin_unlock(&inode->i_lock);
837                 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
838         }
839 }
840 
841 /*
842  * These allocate and release file read/write context information.
843  */
844 int nfs_open(struct inode *inode, struct file *filp)
845 {
846         struct nfs_open_context *ctx;
847 
848         ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
849         if (IS_ERR(ctx))
850                 return PTR_ERR(ctx);
851         nfs_file_set_open_context(filp, ctx);
852         put_nfs_open_context(ctx);
853         nfs_fscache_set_inode_cookie(inode, filp);
854         return 0;
855 }
856 
857 int nfs_release(struct inode *inode, struct file *filp)
858 {
859         nfs_file_clear_open_context(filp);
860         return 0;
861 }
862 
863 /*
864  * This function is called whenever some part of NFS notices that
865  * the cached attributes have to be refreshed.
866  */
867 int
868 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
869 {
870         int              status = -ESTALE;
871         struct nfs4_label *label = NULL;
872         struct nfs_fattr *fattr = NULL;
873         struct nfs_inode *nfsi = NFS_I(inode);
874 
875         dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
876                 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
877 
878         if (is_bad_inode(inode))
879                 goto out;
880         if (NFS_STALE(inode))
881                 goto out;
882 
883         status = -ENOMEM;
884         fattr = nfs_alloc_fattr();
885         if (fattr == NULL)
886                 goto out;
887 
888         nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
889 
890         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
891         if (IS_ERR(label)) {
892                 status = PTR_ERR(label);
893                 goto out;
894         }
895 
896         status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
897         if (status != 0) {
898                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
899                          inode->i_sb->s_id,
900                          (long long)NFS_FILEID(inode), status);
901                 if (status == -ESTALE) {
902                         nfs_zap_caches(inode);
903                         if (!S_ISDIR(inode->i_mode))
904                                 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
905                 }
906                 goto err_out;
907         }
908 
909         status = nfs_refresh_inode(inode, fattr);
910         if (status) {
911                 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
912                          inode->i_sb->s_id,
913                          (long long)NFS_FILEID(inode), status);
914                 goto err_out;
915         }
916 
917         if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
918                 nfs_zap_acl_cache(inode);
919 
920         dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
921                 inode->i_sb->s_id,
922                 (long long)NFS_FILEID(inode));
923 
924 err_out:
925         nfs4_label_free(label);
926 out:
927         nfs_free_fattr(fattr);
928         return status;
929 }
930 
931 int nfs_attribute_timeout(struct inode *inode)
932 {
933         struct nfs_inode *nfsi = NFS_I(inode);
934 
935         return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
936 }
937 
938 int nfs_attribute_cache_expired(struct inode *inode)
939 {
940         if (nfs_have_delegated_attributes(inode))
941                 return 0;
942         return nfs_attribute_timeout(inode);
943 }
944 
945 /**
946  * nfs_revalidate_inode - Revalidate the inode attributes
947  * @server - pointer to nfs_server struct
948  * @inode - pointer to inode struct
949  *
950  * Updates inode attribute information by retrieving the data from the server.
951  */
952 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
953 {
954         if (!(NFS_I(inode)->cache_validity &
955                         (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
956                         && !nfs_attribute_cache_expired(inode))
957                 return NFS_STALE(inode) ? -ESTALE : 0;
958         return __nfs_revalidate_inode(server, inode);
959 }
960 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
961 
962 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
963 {
964         struct nfs_inode *nfsi = NFS_I(inode);
965         int ret;
966 
967         if (mapping->nrpages != 0) {
968                 if (S_ISREG(inode->i_mode)) {
969                         ret = nfs_sync_mapping(mapping);
970                         if (ret < 0)
971                                 return ret;
972                 }
973                 ret = invalidate_inode_pages2(mapping);
974                 if (ret < 0)
975                         return ret;
976         }
977         spin_lock(&inode->i_lock);
978         nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
979         if (S_ISDIR(inode->i_mode))
980                 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
981         spin_unlock(&inode->i_lock);
982         nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
983         nfs_fscache_wait_on_invalidate(inode);
984         dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
985                         inode->i_sb->s_id, (long long)NFS_FILEID(inode));
986         return 0;
987 }
988 
989 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
990 {
991         if (nfs_have_delegated_attributes(inode))
992                 return false;
993         return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
994                 || nfs_attribute_timeout(inode)
995                 || NFS_STALE(inode);
996 }
997 
998 /**
999  * nfs_revalidate_mapping - Revalidate the pagecache
1000  * @inode - pointer to host inode
1001  * @mapping - pointer to mapping
1002  */
1003 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1004 {
1005         struct nfs_inode *nfsi = NFS_I(inode);
1006         int ret = 0;
1007 
1008         /* swapfiles are not supposed to be shared. */
1009         if (IS_SWAPFILE(inode))
1010                 goto out;
1011 
1012         if (nfs_mapping_need_revalidate_inode(inode)) {
1013                 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1014                 if (ret < 0)
1015                         goto out;
1016         }
1017         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1018                 ret = nfs_invalidate_mapping(inode, mapping);
1019 out:
1020         return ret;
1021 }
1022 
1023 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1024 {
1025         struct nfs_inode *nfsi = NFS_I(inode);
1026         unsigned long ret = 0;
1027 
1028         if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1029                         && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1030                         && inode->i_version == fattr->pre_change_attr) {
1031                 inode->i_version = fattr->change_attr;
1032                 if (S_ISDIR(inode->i_mode))
1033                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1034                 ret |= NFS_INO_INVALID_ATTR;
1035         }
1036         /* If we have atomic WCC data, we may update some attributes */
1037         if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1038                         && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1039                         && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1040                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1041                 ret |= NFS_INO_INVALID_ATTR;
1042         }
1043 
1044         if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1045                         && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1046                         && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1047                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1048                 if (S_ISDIR(inode->i_mode))
1049                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1050                 ret |= NFS_INO_INVALID_ATTR;
1051         }
1052         if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1053                         && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1054                         && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1055                         && nfsi->npages == 0) {
1056                 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1057                 ret |= NFS_INO_INVALID_ATTR;
1058         }
1059 
1060         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1061                 nfs_fscache_invalidate(inode);
1062 
1063         return ret;
1064 }
1065 
1066 /**
1067  * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1068  * @inode - pointer to inode
1069  * @fattr - updated attributes
1070  *
1071  * Verifies the attribute cache. If we have just changed the attributes,
1072  * so that fattr carries weak cache consistency data, then it may
1073  * also update the ctime/mtime/change_attribute.
1074  */
1075 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1076 {
1077         struct nfs_inode *nfsi = NFS_I(inode);
1078         loff_t cur_size, new_isize;
1079         unsigned long invalid = 0;
1080 
1081 
1082         if (nfs_have_delegated_attributes(inode))
1083                 return 0;
1084         /* Has the inode gone and changed behind our back? */
1085         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1086                 return -EIO;
1087         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1088                 return -EIO;
1089 
1090         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1091                         inode->i_version != fattr->change_attr)
1092                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1093 
1094         /* Verify a few of the more important attributes */
1095         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1096                 invalid |= NFS_INO_INVALID_ATTR;
1097 
1098         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1099                 cur_size = i_size_read(inode);
1100                 new_isize = nfs_size_to_loff_t(fattr->size);
1101                 if (cur_size != new_isize && nfsi->npages == 0)
1102                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1103         }
1104 
1105         /* Have any file permissions changed? */
1106         if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1107                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1108         if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1109                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1110         if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1111                 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1112 
1113         /* Has the link count changed? */
1114         if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1115                 invalid |= NFS_INO_INVALID_ATTR;
1116 
1117         if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1118                 invalid |= NFS_INO_INVALID_ATIME;
1119 
1120         if (invalid != 0)
1121                 nfsi->cache_validity |= invalid;
1122 
1123         nfsi->read_cache_jiffies = fattr->time_start;
1124         return 0;
1125 }
1126 
1127 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1128 {
1129         if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1130                 return 0;
1131         return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1132 }
1133 
1134 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1135 {
1136         if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1137                 return 0;
1138         return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1139 }
1140 
1141 static atomic_long_t nfs_attr_generation_counter;
1142 
1143 static unsigned long nfs_read_attr_generation_counter(void)
1144 {
1145         return atomic_long_read(&nfs_attr_generation_counter);
1146 }
1147 
1148 unsigned long nfs_inc_attr_generation_counter(void)
1149 {
1150         return atomic_long_inc_return(&nfs_attr_generation_counter);
1151 }
1152 
1153 void nfs_fattr_init(struct nfs_fattr *fattr)
1154 {
1155         fattr->valid = 0;
1156         fattr->time_start = jiffies;
1157         fattr->gencount = nfs_inc_attr_generation_counter();
1158         fattr->owner_name = NULL;
1159         fattr->group_name = NULL;
1160 }
1161 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1162 
1163 struct nfs_fattr *nfs_alloc_fattr(void)
1164 {
1165         struct nfs_fattr *fattr;
1166 
1167         fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1168         if (fattr != NULL)
1169                 nfs_fattr_init(fattr);
1170         return fattr;
1171 }
1172 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1173 
1174 struct nfs_fh *nfs_alloc_fhandle(void)
1175 {
1176         struct nfs_fh *fh;
1177 
1178         fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1179         if (fh != NULL)
1180                 fh->size = 0;
1181         return fh;
1182 }
1183 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1184 
1185 #ifdef NFS_DEBUG
1186 /*
1187  * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1188  *                             in the same way that wireshark does
1189  *
1190  * @fh: file handle
1191  *
1192  * For debugging only.
1193  */
1194 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1195 {
1196         /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1197          * not on the result */
1198         return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1199 }
1200 
1201 /*
1202  * _nfs_display_fhandle - display an NFS file handle on the console
1203  *
1204  * @fh: file handle to display
1205  * @caption: display caption
1206  *
1207  * For debugging only.
1208  */
1209 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1210 {
1211         unsigned short i;
1212 
1213         if (fh == NULL || fh->size == 0) {
1214                 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1215                 return;
1216         }
1217 
1218         printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1219                caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1220         for (i = 0; i < fh->size; i += 16) {
1221                 __be32 *pos = (__be32 *)&fh->data[i];
1222 
1223                 switch ((fh->size - i - 1) >> 2) {
1224                 case 0:
1225                         printk(KERN_DEFAULT " %08x\n",
1226                                 be32_to_cpup(pos));
1227                         break;
1228                 case 1:
1229                         printk(KERN_DEFAULT " %08x %08x\n",
1230                                 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1231                         break;
1232                 case 2:
1233                         printk(KERN_DEFAULT " %08x %08x %08x\n",
1234                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1235                                 be32_to_cpup(pos + 2));
1236                         break;
1237                 default:
1238                         printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1239                                 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1240                                 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1241                 }
1242         }
1243 }
1244 #endif
1245 
1246 /**
1247  * nfs_inode_attrs_need_update - check if the inode attributes need updating
1248  * @inode - pointer to inode
1249  * @fattr - attributes
1250  *
1251  * Attempt to divine whether or not an RPC call reply carrying stale
1252  * attributes got scheduled after another call carrying updated ones.
1253  *
1254  * To do so, the function first assumes that a more recent ctime means
1255  * that the attributes in fattr are newer, however it also attempt to
1256  * catch the case where ctime either didn't change, or went backwards
1257  * (if someone reset the clock on the server) by looking at whether
1258  * or not this RPC call was started after the inode was last updated.
1259  * Note also the check for wraparound of 'attr_gencount'
1260  *
1261  * The function returns 'true' if it thinks the attributes in 'fattr' are
1262  * more recent than the ones cached in the inode.
1263  *
1264  */
1265 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1266 {
1267         const struct nfs_inode *nfsi = NFS_I(inode);
1268 
1269         return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1270                 nfs_ctime_need_update(inode, fattr) ||
1271                 nfs_size_need_update(inode, fattr) ||
1272                 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1273 }
1274 
1275 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1276 {
1277         if (nfs_inode_attrs_need_update(inode, fattr))
1278                 return nfs_update_inode(inode, fattr);
1279         return nfs_check_inode_attributes(inode, fattr);
1280 }
1281 
1282 /**
1283  * nfs_refresh_inode - try to update the inode attribute cache
1284  * @inode - pointer to inode
1285  * @fattr - updated attributes
1286  *
1287  * Check that an RPC call that returned attributes has not overlapped with
1288  * other recent updates of the inode metadata, then decide whether it is
1289  * safe to do a full update of the inode attributes, or whether just to
1290  * call nfs_check_inode_attributes.
1291  */
1292 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1293 {
1294         int status;
1295 
1296         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1297                 return 0;
1298         spin_lock(&inode->i_lock);
1299         status = nfs_refresh_inode_locked(inode, fattr);
1300         spin_unlock(&inode->i_lock);
1301 
1302         return status;
1303 }
1304 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1305 
1306 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1307 {
1308         struct nfs_inode *nfsi = NFS_I(inode);
1309 
1310         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1311         if (S_ISDIR(inode->i_mode)) {
1312                 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1313                 nfs_fscache_invalidate(inode);
1314         }
1315         if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1316                 return 0;
1317         return nfs_refresh_inode_locked(inode, fattr);
1318 }
1319 
1320 /**
1321  * nfs_post_op_update_inode - try to update the inode attribute cache
1322  * @inode - pointer to inode
1323  * @fattr - updated attributes
1324  *
1325  * After an operation that has changed the inode metadata, mark the
1326  * attribute cache as being invalid, then try to update it.
1327  *
1328  * NB: if the server didn't return any post op attributes, this
1329  * function will force the retrieval of attributes before the next
1330  * NFS request.  Thus it should be used only for operations that
1331  * are expected to change one or more attributes, to avoid
1332  * unnecessary NFS requests and trips through nfs_update_inode().
1333  */
1334 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1335 {
1336         int status;
1337 
1338         spin_lock(&inode->i_lock);
1339         status = nfs_post_op_update_inode_locked(inode, fattr);
1340         spin_unlock(&inode->i_lock);
1341 
1342         return status;
1343 }
1344 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1345 
1346 /**
1347  * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1348  * @inode - pointer to inode
1349  * @fattr - updated attributes
1350  *
1351  * After an operation that has changed the inode metadata, mark the
1352  * attribute cache as being invalid, then try to update it. Fake up
1353  * weak cache consistency data, if none exist.
1354  *
1355  * This function is mainly designed to be used by the ->write_done() functions.
1356  */
1357 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1358 {
1359         int status;
1360 
1361         spin_lock(&inode->i_lock);
1362         /* Don't do a WCC update if these attributes are already stale */
1363         if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1364                         !nfs_inode_attrs_need_update(inode, fattr)) {
1365                 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1366                                 | NFS_ATTR_FATTR_PRESIZE
1367                                 | NFS_ATTR_FATTR_PREMTIME
1368                                 | NFS_ATTR_FATTR_PRECTIME);
1369                 goto out_noforce;
1370         }
1371         if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1372                         (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1373                 fattr->pre_change_attr = inode->i_version;
1374                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1375         }
1376         if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1377                         (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1378                 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1379                 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1380         }
1381         if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1382                         (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1383                 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1384                 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1385         }
1386         if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1387                         (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1388                 fattr->pre_size = i_size_read(inode);
1389                 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1390         }
1391 out_noforce:
1392         status = nfs_post_op_update_inode_locked(inode, fattr);
1393         spin_unlock(&inode->i_lock);
1394         return status;
1395 }
1396 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1397 
1398 /*
1399  * Many nfs protocol calls return the new file attributes after
1400  * an operation.  Here we update the inode to reflect the state
1401  * of the server's inode.
1402  *
1403  * This is a bit tricky because we have to make sure all dirty pages
1404  * have been sent off to the server before calling invalidate_inode_pages.
1405  * To make sure no other process adds more write requests while we try
1406  * our best to flush them, we make them sleep during the attribute refresh.
1407  *
1408  * A very similar scenario holds for the dir cache.
1409  */
1410 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1411 {
1412         struct nfs_server *server;
1413         struct nfs_inode *nfsi = NFS_I(inode);
1414         loff_t cur_isize, new_isize;
1415         unsigned long invalid = 0;
1416         unsigned long now = jiffies;
1417         unsigned long save_cache_validity;
1418 
1419         dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1420                         __func__, inode->i_sb->s_id, inode->i_ino,
1421                         nfs_display_fhandle_hash(NFS_FH(inode)),
1422                         atomic_read(&inode->i_count), fattr->valid);
1423 
1424         if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1425                 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1426                         "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1427                         NFS_SERVER(inode)->nfs_client->cl_hostname,
1428                         inode->i_sb->s_id, (long long)nfsi->fileid,
1429                         (long long)fattr->fileid);
1430                 goto out_err;
1431         }
1432 
1433         /*
1434          * Make sure the inode's type hasn't changed.
1435          */
1436         if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1437                 /*
1438                 * Big trouble! The inode has become a different object.
1439                 */
1440                 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1441                                 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1442                 goto out_err;
1443         }
1444 
1445         server = NFS_SERVER(inode);
1446         /* Update the fsid? */
1447         if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1448                         !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1449                         !IS_AUTOMOUNT(inode))
1450                 server->fsid = fattr->fsid;
1451 
1452         /*
1453          * Update the read time so we don't revalidate too often.
1454          */
1455         nfsi->read_cache_jiffies = fattr->time_start;
1456 
1457         save_cache_validity = nfsi->cache_validity;
1458         nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1459                         | NFS_INO_INVALID_ATIME
1460                         | NFS_INO_REVAL_FORCED
1461                         | NFS_INO_REVAL_PAGECACHE);
1462 
1463         /* Do atomic weak cache consistency updates */
1464         invalid |= nfs_wcc_update_inode(inode, fattr);
1465 
1466         /* More cache consistency checks */
1467         if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1468                 if (inode->i_version != fattr->change_attr) {
1469                         dprintk("NFS: change_attr change on server for file %s/%ld\n",
1470                                         inode->i_sb->s_id, inode->i_ino);
1471                         invalid |= NFS_INO_INVALID_ATTR
1472                                 | NFS_INO_INVALID_DATA
1473                                 | NFS_INO_INVALID_ACCESS
1474                                 | NFS_INO_INVALID_ACL
1475                                 | NFS_INO_REVAL_PAGECACHE;
1476                         if (S_ISDIR(inode->i_mode))
1477                                 nfs_force_lookup_revalidate(inode);
1478                         inode->i_version = fattr->change_attr;
1479                 }
1480         } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1481                 invalid |= save_cache_validity;
1482 
1483         if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1484                 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1485         } else if (server->caps & NFS_CAP_MTIME)
1486                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1487                                 | NFS_INO_REVAL_FORCED);
1488 
1489         if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1490                 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1491         } else if (server->caps & NFS_CAP_CTIME)
1492                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1493                                 | NFS_INO_REVAL_FORCED);
1494 
1495         /* Check if our cached file size is stale */
1496         if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1497                 new_isize = nfs_size_to_loff_t(fattr->size);
1498                 cur_isize = i_size_read(inode);
1499                 if (new_isize != cur_isize) {
1500                         /* Do we perhaps have any outstanding writes, or has
1501                          * the file grown beyond our last write? */
1502                         if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1503                              new_isize > cur_isize) {
1504                                 i_size_write(inode, new_isize);
1505                                 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1506                         }
1507                         dprintk("NFS: isize change on server for file %s/%ld "
1508                                         "(%Ld to %Ld)\n",
1509                                         inode->i_sb->s_id,
1510                                         inode->i_ino,
1511                                         (long long)cur_isize,
1512                                         (long long)new_isize);
1513                 }
1514         } else
1515                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1516                                 | NFS_INO_REVAL_PAGECACHE
1517                                 | NFS_INO_REVAL_FORCED);
1518 
1519 
1520         if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1521                 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1522         else if (server->caps & NFS_CAP_ATIME)
1523                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1524                                 | NFS_INO_REVAL_FORCED);
1525 
1526         if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1527                 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1528                         umode_t newmode = inode->i_mode & S_IFMT;
1529                         newmode |= fattr->mode & S_IALLUGO;
1530                         inode->i_mode = newmode;
1531                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1532                 }
1533         } else if (server->caps & NFS_CAP_MODE)
1534                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1535                                 | NFS_INO_INVALID_ACCESS
1536                                 | NFS_INO_INVALID_ACL
1537                                 | NFS_INO_REVAL_FORCED);
1538 
1539         if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1540                 if (!uid_eq(inode->i_uid, fattr->uid)) {
1541                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1542                         inode->i_uid = fattr->uid;
1543                 }
1544         } else if (server->caps & NFS_CAP_OWNER)
1545                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1546                                 | NFS_INO_INVALID_ACCESS
1547                                 | NFS_INO_INVALID_ACL
1548                                 | NFS_INO_REVAL_FORCED);
1549 
1550         if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1551                 if (!gid_eq(inode->i_gid, fattr->gid)) {
1552                         invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1553                         inode->i_gid = fattr->gid;
1554                 }
1555         } else if (server->caps & NFS_CAP_OWNER_GROUP)
1556                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1557                                 | NFS_INO_INVALID_ACCESS
1558                                 | NFS_INO_INVALID_ACL
1559                                 | NFS_INO_REVAL_FORCED);
1560 
1561         if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1562                 if (inode->i_nlink != fattr->nlink) {
1563                         invalid |= NFS_INO_INVALID_ATTR;
1564                         if (S_ISDIR(inode->i_mode))
1565                                 invalid |= NFS_INO_INVALID_DATA;
1566                         set_nlink(inode, fattr->nlink);
1567                 }
1568         } else if (server->caps & NFS_CAP_NLINK)
1569                 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1570                                 | NFS_INO_REVAL_FORCED);
1571 
1572         if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1573                 /*
1574                  * report the blocks in 512byte units
1575                  */
1576                 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1577         }
1578         if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1579                 inode->i_blocks = fattr->du.nfs2.blocks;
1580 
1581         /* Update attrtimeo value if we're out of the unstable period */
1582         if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
1583                 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1584                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1585                 nfsi->attrtimeo_timestamp = now;
1586                 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1587         } else {
1588                 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1589                         if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1590                                 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1591                         nfsi->attrtimeo_timestamp = now;
1592                 }
1593         }
1594         invalid &= ~NFS_INO_INVALID_ATTR;
1595         invalid &= ~NFS_INO_INVALID_LABEL;
1596         /* Don't invalidate the data if we were to blame */
1597         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1598                                 || S_ISLNK(inode->i_mode)))
1599                 invalid &= ~NFS_INO_INVALID_DATA;
1600         if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1601                         (save_cache_validity & NFS_INO_REVAL_FORCED))
1602                 nfsi->cache_validity |= invalid;
1603 
1604         if (invalid & NFS_INO_INVALID_DATA)
1605                 nfs_fscache_invalidate(inode);
1606 
1607         return 0;
1608  out_err:
1609         /*
1610          * No need to worry about unhashing the dentry, as the
1611          * lookup validation will know that the inode is bad.
1612          * (But we fall through to invalidate the caches.)
1613          */
1614         nfs_invalidate_inode(inode);
1615         return -ESTALE;
1616 }
1617 
1618 struct inode *nfs_alloc_inode(struct super_block *sb)
1619 {
1620         struct nfs_inode *nfsi;
1621         nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1622         if (!nfsi)
1623                 return NULL;
1624         nfsi->flags = 0UL;
1625         nfsi->cache_validity = 0UL;
1626 #ifdef CONFIG_NFS_V3_ACL
1627         nfsi->acl_access = ERR_PTR(-EAGAIN);
1628         nfsi->acl_default = ERR_PTR(-EAGAIN);
1629 #endif
1630 #if IS_ENABLED(CONFIG_NFS_V4)
1631         nfsi->nfs4_acl = NULL;
1632 #endif /* CONFIG_NFS_V4 */
1633         return &nfsi->vfs_inode;
1634 }
1635 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1636 
1637 static void nfs_i_callback(struct rcu_head *head)
1638 {
1639         struct inode *inode = container_of(head, struct inode, i_rcu);
1640         kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1641 }
1642 
1643 void nfs_destroy_inode(struct inode *inode)
1644 {
1645         call_rcu(&inode->i_rcu, nfs_i_callback);
1646 }
1647 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1648 
1649 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1650 {
1651 #if IS_ENABLED(CONFIG_NFS_V4)
1652         INIT_LIST_HEAD(&nfsi->open_states);
1653         nfsi->delegation = NULL;
1654         nfsi->delegation_state = 0;
1655         init_rwsem(&nfsi->rwsem);
1656         nfsi->layout = NULL;
1657 #endif
1658 }
1659 
1660 static void init_once(void *foo)
1661 {
1662         struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1663 
1664         inode_init_once(&nfsi->vfs_inode);
1665         INIT_LIST_HEAD(&nfsi->open_files);
1666         INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1667         INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1668         INIT_LIST_HEAD(&nfsi->commit_info.list);
1669         nfsi->npages = 0;
1670         nfsi->commit_info.ncommit = 0;
1671         atomic_set(&nfsi->commit_info.rpcs_out, 0);
1672         atomic_set(&nfsi->silly_count, 1);
1673         INIT_HLIST_HEAD(&nfsi->silly_list);
1674         init_waitqueue_head(&nfsi->waitqueue);
1675         nfs4_init_once(nfsi);
1676 }
1677 
1678 static int __init nfs_init_inodecache(void)
1679 {
1680         nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1681                                              sizeof(struct nfs_inode),
1682                                              0, (SLAB_RECLAIM_ACCOUNT|
1683                                                 SLAB_MEM_SPREAD),
1684                                              init_once);
1685         if (nfs_inode_cachep == NULL)
1686                 return -ENOMEM;
1687 
1688         return 0;
1689 }
1690 
1691 static void nfs_destroy_inodecache(void)
1692 {
1693         /*
1694          * Make sure all delayed rcu free inodes are flushed before we
1695          * destroy cache.
1696          */
1697         rcu_barrier();
1698         kmem_cache_destroy(nfs_inode_cachep);
1699 }
1700 
1701 struct workqueue_struct *nfsiod_workqueue;
1702 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1703 
1704 /*
1705  * start up the nfsiod workqueue
1706  */
1707 static int nfsiod_start(void)
1708 {
1709         struct workqueue_struct *wq;
1710         dprintk("RPC:       creating workqueue nfsiod\n");
1711         wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1712         if (wq == NULL)
1713                 return -ENOMEM;
1714         nfsiod_workqueue = wq;
1715         return 0;
1716 }
1717 
1718 /*
1719  * Destroy the nfsiod workqueue
1720  */
1721 static void nfsiod_stop(void)
1722 {
1723         struct workqueue_struct *wq;
1724 
1725         wq = nfsiod_workqueue;
1726         if (wq == NULL)
1727                 return;
1728         nfsiod_workqueue = NULL;
1729         destroy_workqueue(wq);
1730 }
1731 
1732 int nfs_net_id;
1733 EXPORT_SYMBOL_GPL(nfs_net_id);
1734 
1735 static int nfs_net_init(struct net *net)
1736 {
1737         nfs_clients_init(net);
1738         return 0;
1739 }
1740 
1741 static void nfs_net_exit(struct net *net)
1742 {
1743         nfs_cleanup_cb_ident_idr(net);
1744 }
1745 
1746 static struct pernet_operations nfs_net_ops = {
1747         .init = nfs_net_init,
1748         .exit = nfs_net_exit,
1749         .id   = &nfs_net_id,
1750         .size = sizeof(struct nfs_net),
1751 };
1752 
1753 /*
1754  * Initialize NFS
1755  */
1756 static int __init init_nfs_fs(void)
1757 {
1758         int err;
1759 
1760         err = register_pernet_subsys(&nfs_net_ops);
1761         if (err < 0)
1762                 goto out9;
1763 
1764         err = nfs_fscache_register();
1765         if (err < 0)
1766                 goto out8;
1767 
1768         err = nfsiod_start();
1769         if (err)
1770                 goto out7;
1771 
1772         err = nfs_fs_proc_init();
1773         if (err)
1774                 goto out6;
1775 
1776         err = nfs_init_nfspagecache();
1777         if (err)
1778                 goto out5;
1779 
1780         err = nfs_init_inodecache();
1781         if (err)
1782                 goto out4;
1783 
1784         err = nfs_init_readpagecache();
1785         if (err)
1786                 goto out3;
1787 
1788         err = nfs_init_writepagecache();
1789         if (err)
1790                 goto out2;
1791 
1792         err = nfs_init_directcache();
1793         if (err)
1794                 goto out1;
1795 
1796 #ifdef CONFIG_PROC_FS
1797         rpc_proc_register(&init_net, &nfs_rpcstat);
1798 #endif
1799         if ((err = register_nfs_fs()) != 0)
1800                 goto out0;
1801 
1802         return 0;
1803 out0:
1804 #ifdef CONFIG_PROC_FS
1805         rpc_proc_unregister(&init_net, "nfs");
1806 #endif
1807         nfs_destroy_directcache();
1808 out1:
1809         nfs_destroy_writepagecache();
1810 out2:
1811         nfs_destroy_readpagecache();
1812 out3:
1813         nfs_destroy_inodecache();
1814 out4:
1815         nfs_destroy_nfspagecache();
1816 out5:
1817         nfs_fs_proc_exit();
1818 out6:
1819         nfsiod_stop();
1820 out7:
1821         nfs_fscache_unregister();
1822 out8:
1823         unregister_pernet_subsys(&nfs_net_ops);
1824 out9:
1825         return err;
1826 }
1827 
1828 static void __exit exit_nfs_fs(void)
1829 {
1830         nfs_destroy_directcache();
1831         nfs_destroy_writepagecache();
1832         nfs_destroy_readpagecache();
1833         nfs_destroy_inodecache();
1834         nfs_destroy_nfspagecache();
1835         nfs_fscache_unregister();
1836         unregister_pernet_subsys(&nfs_net_ops);
1837 #ifdef CONFIG_PROC_FS
1838         rpc_proc_unregister(&init_net, "nfs");
1839 #endif
1840         unregister_nfs_fs();
1841         nfs_fs_proc_exit();
1842         nfsiod_stop();
1843 }
1844 
1845 /* Not quite true; I just maintain it */
1846 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1847 MODULE_LICENSE("GPL");
1848 module_param(enable_ino64, bool, 0644);
1849 
1850 module_init(init_nfs_fs)
1851 module_exit(exit_nfs_fs)
1852 

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