2 * NFS internal definitions
6 #include <linux/mount.h>
7 #include <linux/security.h>
8 #include <linux/crc32.h>
9 #include <linux/nfs_page.h>
11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
15 /* Maximum number of readahead requests
16 * FIXME: this should really be a sysctl so that users may tune it to suit
17 * their needs. People that do NFS over a slow network, might for
18 * instance want to reduce it to something closer to 1 for improved
19 * interactive response.
21 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
38 struct nfs_clone_mount {
39 const struct super_block *sb;
40 const struct dentry *dentry;
42 struct nfs_fattr *fattr;
45 struct sockaddr *addr;
47 rpc_authflavor_t authflavor;
51 * Note: RFC 1813 doesn't limit the number of auth flavors that
52 * a server can return, so make something up.
54 #define NFS_MAX_SECFLAVORS (12)
57 * Value used if the user did not specify a port value.
59 #define NFS_UNSPEC_PORT (-1)
62 * Maximum number of pages that readdir can use for creating
63 * a vmapped array of pages.
65 #define NFS_MAX_READDIR_PAGES 8
67 struct nfs_client_initdata {
68 unsigned long init_flags;
70 const struct sockaddr *addr;
72 struct nfs_subversion *nfs_mod;
79 * In-kernel mount arguments
81 struct nfs_parsed_mount_data {
83 unsigned int rsize, wsize;
84 unsigned int timeo, retrans;
85 unsigned int acregmin, acregmax,
90 struct nfs_auth_info auth_info;
91 rpc_authflavor_t selected_flavor;
94 unsigned int minorversion;
99 struct sockaddr_storage address;
104 unsigned short protocol;
108 struct sockaddr_storage address;
113 unsigned short protocol;
116 struct security_mnt_opts lsm_opts;
121 struct nfs_mount_request {
122 struct sockaddr *sap;
127 unsigned short protocol;
130 unsigned int *auth_flav_len;
131 rpc_authflavor_t *auth_flavs;
135 struct nfs_mount_info {
136 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
137 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
138 struct nfs_parsed_mount_data *parsed;
139 struct nfs_clone_mount *cloned;
140 struct nfs_fh *mntfh;
143 extern int nfs_mount(struct nfs_mount_request *info);
144 extern void nfs_umount(const struct nfs_mount_request *info);
147 extern const struct rpc_program nfs_program;
148 extern void nfs_clients_init(struct net *net);
149 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
150 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
151 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
152 const struct rpc_timeout *, const char *,
154 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
155 void nfs_server_insert_lists(struct nfs_server *);
156 void nfs_server_remove_lists(struct nfs_server *);
157 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
158 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
160 struct nfs_server *nfs_alloc_server(void);
161 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
163 extern void nfs_cleanup_cb_ident_idr(struct net *);
164 extern void nfs_put_client(struct nfs_client *);
165 extern void nfs_free_client(struct nfs_client *);
166 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
167 extern struct nfs_client *
168 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
169 struct nfs4_sessionid *, u32);
170 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
171 struct nfs_subversion *);
172 extern struct nfs_server *nfs4_create_server(
173 struct nfs_mount_info *,
174 struct nfs_subversion *);
175 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
177 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
178 struct sockaddr *sap, size_t salen,
180 extern void nfs_free_server(struct nfs_server *server);
181 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
185 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
186 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
187 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
188 const struct sockaddr *ds_addr,
189 int ds_addrlen, int ds_proto,
190 unsigned int ds_timeo,
191 unsigned int ds_retrans,
193 rpc_authflavor_t au_flavor);
194 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
196 extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
197 const struct sockaddr *ds_addr, int ds_addrlen,
198 int ds_proto, unsigned int ds_timeo,
199 unsigned int ds_retrans, rpc_authflavor_t au_flavor);
200 #ifdef CONFIG_PROC_FS
201 extern int __init nfs_fs_proc_init(void);
202 extern void nfs_fs_proc_exit(void);
203 extern int nfs_fs_proc_net_init(struct net *net);
204 extern void nfs_fs_proc_net_exit(struct net *net);
206 static inline int nfs_fs_proc_net_init(struct net *net)
210 static inline void nfs_fs_proc_net_exit(struct net *net)
213 static inline int nfs_fs_proc_init(void)
217 static inline void nfs_fs_proc_exit(void)
223 extern struct svc_version nfs4_callback_version1;
224 extern struct svc_version nfs4_callback_version4;
226 struct nfs_pageio_descriptor;
228 extern int __init nfs_init_nfspagecache(void);
229 extern void nfs_destroy_nfspagecache(void);
230 extern int __init nfs_init_readpagecache(void);
231 extern void nfs_destroy_readpagecache(void);
232 extern int __init nfs_init_writepagecache(void);
233 extern void nfs_destroy_writepagecache(void);
235 extern int __init nfs_init_directcache(void);
236 extern void nfs_destroy_directcache(void);
237 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
238 struct nfs_pgio_header *hdr,
239 void (*release)(struct nfs_pgio_header *hdr));
240 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
241 int nfs_iocounter_wait(struct nfs_io_counter *c);
243 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
244 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
245 void nfs_pgio_header_free(struct nfs_pgio_header *);
246 void nfs_pgio_data_destroy(struct nfs_pgio_header *);
247 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
248 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
249 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
250 const struct rpc_call_ops *call_ops, int how, int flags);
251 void nfs_free_request(struct nfs_page *req);
252 struct nfs_pgio_mirror *
253 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
255 static inline void nfs_iocounter_init(struct nfs_io_counter *c)
258 atomic_set(&c->io_count, 0);
261 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
263 WARN_ON_ONCE(desc->pg_mirror_count < 1);
264 return desc->pg_mirror_count > 1;
268 extern struct rpc_procinfo nfs_procedures[];
269 extern int nfs2_decode_dirent(struct xdr_stream *,
270 struct nfs_entry *, int);
273 extern struct rpc_procinfo nfs3_procedures[];
274 extern int nfs3_decode_dirent(struct xdr_stream *,
275 struct nfs_entry *, int);
278 #if IS_ENABLED(CONFIG_NFS_V4)
279 extern int nfs4_decode_dirent(struct xdr_stream *,
280 struct nfs_entry *, int);
282 #ifdef CONFIG_NFS_V4_1
283 extern const u32 nfs41_maxread_overhead;
284 extern const u32 nfs41_maxwrite_overhead;
285 extern const u32 nfs41_maxgetdevinfo_overhead;
289 #if IS_ENABLED(CONFIG_NFS_V4)
290 extern struct rpc_procinfo nfs4_procedures[];
293 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
294 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
295 static inline struct nfs4_label *
296 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
301 if (src->len > NFS4_MAXLABELLEN)
307 memcpy(dst->label, src->label, src->len);
311 static inline void nfs4_label_free(struct nfs4_label *label)
320 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
322 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
323 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
326 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
327 static inline void nfs4_label_free(void *label) {}
328 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
331 static inline struct nfs4_label *
332 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
336 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
339 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
340 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
341 const struct rpc_timeout *timeparms,
342 const char *ip_addr);
345 extern void nfs_force_use_readdirplus(struct inode *dir);
346 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
347 struct shrink_control *sc);
348 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
349 struct shrink_control *sc);
350 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
351 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
352 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
353 int nfs_rmdir(struct inode *, struct dentry *);
354 int nfs_unlink(struct inode *, struct dentry *);
355 int nfs_symlink(struct inode *, struct dentry *, const char *);
356 int nfs_link(struct dentry *, struct inode *, struct dentry *);
357 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
358 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
361 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
362 loff_t nfs_file_llseek(struct file *, loff_t, int);
363 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
364 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
365 size_t, unsigned int);
366 int nfs_file_mmap(struct file *, struct vm_area_struct *);
367 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
368 int nfs_file_release(struct inode *, struct file *);
369 int nfs_lock(struct file *, int, struct file_lock *);
370 int nfs_flock(struct file *, int, struct file_lock *);
371 int nfs_check_flags(int);
374 extern struct workqueue_struct *nfsiod_workqueue;
375 extern struct inode *nfs_alloc_inode(struct super_block *sb);
376 extern void nfs_destroy_inode(struct inode *);
377 extern int nfs_write_inode(struct inode *, struct writeback_control *);
378 extern int nfs_drop_inode(struct inode *);
379 extern void nfs_clear_inode(struct inode *);
380 extern void nfs_evict_inode(struct inode *);
381 void nfs_zap_acl_cache(struct inode *inode);
382 extern int nfs_wait_bit_killable(struct wait_bit_key *key);
385 extern const struct super_operations nfs_sops;
386 extern struct file_system_type nfs_fs_type;
387 extern struct file_system_type nfs_xdev_fs_type;
388 #if IS_ENABLED(CONFIG_NFS_V4)
389 extern struct file_system_type nfs4_xdev_fs_type;
390 extern struct file_system_type nfs4_referral_fs_type;
392 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
393 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
394 struct nfs_subversion *);
395 void nfs_initialise_sb(struct super_block *);
396 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
397 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
398 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
399 struct nfs_mount_info *, struct nfs_subversion *);
400 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
401 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
402 const char *, struct nfs_mount_info *);
403 void nfs_kill_super(struct super_block *);
404 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
406 extern struct rpc_stat nfs_rpcstat;
408 extern int __init register_nfs_fs(void);
409 extern void __exit unregister_nfs_fs(void);
410 extern bool nfs_sb_active(struct super_block *sb);
411 extern void nfs_sb_deactive(struct super_block *sb);
414 #define NFS_PATH_CANONICAL 1
415 extern char *nfs_path(char **p, struct dentry *dentry,
416 char *buffer, ssize_t buflen, unsigned flags);
417 extern struct vfsmount *nfs_d_automount(struct path *path);
418 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
419 struct nfs_fh *, struct nfs_fattr *);
420 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
421 struct nfs_fattr *, rpc_authflavor_t);
424 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
426 #if IS_ENABLED(CONFIG_NFS_V4)
427 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
430 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
433 struct nfs_pgio_completion_ops;
435 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
436 struct inode *inode, bool force_mds,
437 const struct nfs_pgio_completion_ops *compl_ops);
438 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
439 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
442 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
443 void nfs_umount_begin(struct super_block *);
444 int nfs_statfs(struct dentry *, struct kstatfs *);
445 int nfs_show_options(struct seq_file *, struct dentry *);
446 int nfs_show_devname(struct seq_file *, struct dentry *);
447 int nfs_show_path(struct seq_file *, struct dentry *);
448 int nfs_show_stats(struct seq_file *, struct dentry *);
449 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
452 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
453 struct inode *inode, int ioflags, bool force_mds,
454 const struct nfs_pgio_completion_ops *compl_ops);
455 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
456 extern void nfs_commit_free(struct nfs_commit_data *p);
457 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
458 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
459 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
460 struct nfs_commit_data *data,
461 const struct nfs_rpc_ops *nfs_ops,
462 const struct rpc_call_ops *call_ops,
464 extern void nfs_init_commit(struct nfs_commit_data *data,
465 struct list_head *head,
466 struct pnfs_layout_segment *lseg,
467 struct nfs_commit_info *cinfo);
468 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
469 struct nfs_commit_info *cinfo, int max);
470 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
471 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
472 struct nfs_commit_info *cinfo);
473 void nfs_mark_request_commit(struct nfs_page *req,
474 struct pnfs_layout_segment *lseg,
475 struct nfs_commit_info *cinfo,
477 int nfs_write_need_commit(struct nfs_pgio_header *);
478 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
479 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
480 int how, struct nfs_commit_info *cinfo);
481 void nfs_retry_commit(struct list_head *page_list,
482 struct pnfs_layout_segment *lseg,
483 struct nfs_commit_info *cinfo,
485 void nfs_commitdata_release(struct nfs_commit_data *data);
486 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
487 struct nfs_commit_info *cinfo);
488 void nfs_request_add_commit_list_locked(struct nfs_page *req,
489 struct list_head *dst,
490 struct nfs_commit_info *cinfo);
491 void nfs_request_remove_commit_list(struct nfs_page *req,
492 struct nfs_commit_info *cinfo);
493 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
495 struct nfs_direct_req *dreq);
496 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
497 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
498 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
500 #ifdef CONFIG_MIGRATION
501 extern int nfs_migrate_page(struct address_space *,
502 struct page *, struct page *, enum migrate_mode);
504 #define nfs_migrate_page NULL
508 extern struct rpc_task *
509 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
510 struct dentry *old_dentry, struct dentry *new_dentry,
511 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
512 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
515 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
516 struct nfs_direct_req *dreq);
517 static inline void nfs_inode_dio_wait(struct inode *inode)
519 inode_dio_wait(inode);
521 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
522 extern void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq);
525 extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
526 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
527 const struct rpc_timeout *timeparms,
528 const char *ip_addr);
529 extern int nfs40_walk_client_list(struct nfs_client *clp,
530 struct nfs_client **result,
531 struct rpc_cred *cred);
532 extern int nfs41_walk_client_list(struct nfs_client *clp,
533 struct nfs_client **result,
534 struct rpc_cred *cred);
536 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
538 inode = igrab(inode);
539 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
546 static inline void nfs_iput_and_deactive(struct inode *inode)
549 struct super_block *sb = inode->i_sb;
557 * Determine the device name as a string
559 static inline char *nfs_devname(struct dentry *dentry,
560 char *buffer, ssize_t buflen)
563 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
567 * Determine the actual block size (and log2 thereof)
570 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
572 /* make sure blocksize is a power of two */
573 if ((bsize & (bsize - 1)) || nrbitsp) {
574 unsigned char nrbits;
576 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
587 * Calculate the number of 512byte blocks used.
589 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
591 blkcnt_t used = (tsize + 511) >> 9;
592 return (used > ULONG_MAX) ? ULONG_MAX : used;
596 * Compute and set NFS server blocksize
599 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
601 if (bsize < NFS_MIN_FILE_IO_SIZE)
602 bsize = NFS_DEF_FILE_IO_SIZE;
603 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
604 bsize = NFS_MAX_FILE_IO_SIZE;
606 return nfs_block_bits(bsize, nrbitsp);
610 * Determine the maximum file size for a superblock
613 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
615 sb->s_maxbytes = (loff_t)maxfilesize;
616 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
617 sb->s_maxbytes = MAX_LFS_FILESIZE;
621 * Record the page as unstable and mark its inode as dirty.
624 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
627 struct inode *inode = page_file_mapping(page)->host;
629 inc_zone_page_state(page, NR_UNSTABLE_NFS);
630 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
631 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
636 * Determine the number of bytes of data the page contains
639 unsigned int nfs_page_length(struct page *page)
641 loff_t i_size = i_size_read(page_file_mapping(page)->host);
644 pgoff_t page_index = page_file_index(page);
645 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
646 if (page_index < end_index)
647 return PAGE_CACHE_SIZE;
648 if (page_index == end_index)
649 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
655 * Convert a umode to a dirent->d_type
658 unsigned char nfs_umode_to_dtype(umode_t mode)
660 return (mode >> 12) & 15;
664 * Determine the number of pages in an array of length 'len' and
665 * with a base offset of 'base'
668 unsigned int nfs_page_array_len(unsigned int base, size_t len)
670 return ((unsigned long)len + (unsigned long)base +
671 PAGE_SIZE - 1) >> PAGE_SHIFT;
675 * Convert a struct timespec into a 64-bit change attribute
677 * This does approximately the same thing as timespec_to_ns(),
678 * but for calculation efficiency, we multiply the seconds by
682 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
684 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
689 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
690 * @fh - pointer to filehandle
692 * returns a crc32 hash for the filehandle that is compatible with
693 * the one displayed by "wireshark".
695 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
697 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
700 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)