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TOMOYO Linux Cross Reference
Linux/fs/nfs/internal.h

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  1 /*
  2  * NFS internal definitions
  3  */
  4 
  5 #include "nfs4_fs.h"
  6 #include <linux/mount.h>
  7 #include <linux/security.h>
  8 #include <linux/crc32.h>
  9 #include <linux/nfs_page.h>
 10 
 11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
 12 
 13 struct nfs_string;
 14 
 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.
 20  */
 21 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
 22 
 23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
 24 {
 25         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
 26                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
 27 }
 28 
 29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
 30 {
 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)))
 34                 return 0;
 35         return 1;
 36 }
 37 
 38 struct nfs_clone_mount {
 39         const struct super_block *sb;
 40         const struct dentry *dentry;
 41         struct nfs_fh *fh;
 42         struct nfs_fattr *fattr;
 43         char *hostname;
 44         char *mnt_path;
 45         struct sockaddr *addr;
 46         size_t addrlen;
 47         rpc_authflavor_t authflavor;
 48 };
 49 
 50 /*
 51  * Note: RFC 1813 doesn't limit the number of auth flavors that
 52  * a server can return, so make something up.
 53  */
 54 #define NFS_MAX_SECFLAVORS      (12)
 55 
 56 /*
 57  * Value used if the user did not specify a port value.
 58  */
 59 #define NFS_UNSPEC_PORT         (-1)
 60 
 61 /*
 62  * Maximum number of pages that readdir can use for creating
 63  * a vmapped array of pages.
 64  */
 65 #define NFS_MAX_READDIR_PAGES 8
 66 
 67 struct nfs_client_initdata {
 68         unsigned long init_flags;
 69         const char *hostname;
 70         const struct sockaddr *addr;
 71         size_t addrlen;
 72         struct nfs_subversion *nfs_mod;
 73         int proto;
 74         u32 minorversion;
 75         struct net *net;
 76 };
 77 
 78 /*
 79  * In-kernel mount arguments
 80  */
 81 struct nfs_parsed_mount_data {
 82         int                     flags;
 83         unsigned int            rsize, wsize;
 84         unsigned int            timeo, retrans;
 85         unsigned int            acregmin, acregmax,
 86                                 acdirmin, acdirmax;
 87         unsigned int            namlen;
 88         unsigned int            options;
 89         unsigned int            bsize;
 90         struct nfs_auth_info    auth_info;
 91         rpc_authflavor_t        selected_flavor;
 92         char                    *client_address;
 93         unsigned int            version;
 94         unsigned int            minorversion;
 95         char                    *fscache_uniq;
 96         bool                    need_mount;
 97 
 98         struct {
 99                 struct sockaddr_storage address;
100                 size_t                  addrlen;
101                 char                    *hostname;
102                 u32                     version;
103                 int                     port;
104                 unsigned short          protocol;
105         } mount_server;
106 
107         struct {
108                 struct sockaddr_storage address;
109                 size_t                  addrlen;
110                 char                    *hostname;
111                 char                    *export_path;
112                 int                     port;
113                 unsigned short          protocol;
114         } nfs_server;
115 
116         struct security_mnt_opts lsm_opts;
117         struct net              *net;
118 };
119 
120 /* mount_clnt.c */
121 struct nfs_mount_request {
122         struct sockaddr         *sap;
123         size_t                  salen;
124         char                    *hostname;
125         char                    *dirpath;
126         u32                     version;
127         unsigned short          protocol;
128         struct nfs_fh           *fh;
129         int                     noresvport;
130         unsigned int            *auth_flav_len;
131         rpc_authflavor_t        *auth_flavs;
132         struct net              *net;
133 };
134 
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;
141 };
142 
143 extern int nfs_mount(struct nfs_mount_request *info);
144 extern void nfs_umount(const struct nfs_mount_request *info);
145 
146 /* client.c */
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 *,
153                                   rpc_authflavor_t);
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,
159                 rpc_authflavor_t);
160 struct nfs_server *nfs_alloc_server(void);
161 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
162 
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 *,
176                                                       struct nfs_fh *);
177 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
178                                         struct sockaddr *sap, size_t salen,
179                                         struct net *net);
180 extern void nfs_free_server(struct nfs_server *server);
181 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
182                                            struct nfs_fh *,
183                                            struct nfs_fattr *,
184                                            rpc_authflavor_t);
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,
192                                              u32 minor_version,
193                                              rpc_authflavor_t au_flavor);
194 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
195                                                 struct inode *);
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);
205 #else
206 static inline int nfs_fs_proc_net_init(struct net *net)
207 {
208         return 0;
209 }
210 static inline void nfs_fs_proc_net_exit(struct net *net)
211 {
212 }
213 static inline int nfs_fs_proc_init(void)
214 {
215         return 0;
216 }
217 static inline void nfs_fs_proc_exit(void)
218 {
219 }
220 #endif
221 
222 /* callback_xdr.c */
223 extern struct svc_version nfs4_callback_version1;
224 extern struct svc_version nfs4_callback_version4;
225 
226 struct nfs_pageio_descriptor;
227 /* pagelist.c */
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);
234 
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);
242 
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);
254 
255 static inline void nfs_iocounter_init(struct nfs_io_counter *c)
256 {
257         c->flags = 0;
258         atomic_set(&c->io_count, 0);
259 }
260 
261 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
262 {
263         WARN_ON_ONCE(desc->pg_mirror_count < 1);
264         return desc->pg_mirror_count > 1;
265 }
266 
267 /* nfs2xdr.c */
268 extern struct rpc_procinfo nfs_procedures[];
269 extern int nfs2_decode_dirent(struct xdr_stream *,
270                                 struct nfs_entry *, int);
271 
272 /* nfs3xdr.c */
273 extern struct rpc_procinfo nfs3_procedures[];
274 extern int nfs3_decode_dirent(struct xdr_stream *,
275                                 struct nfs_entry *, int);
276 
277 /* nfs4xdr.c */
278 #if IS_ENABLED(CONFIG_NFS_V4)
279 extern int nfs4_decode_dirent(struct xdr_stream *,
280                                 struct nfs_entry *, int);
281 #endif
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;
286 #endif
287 
288 /* nfs4proc.c */
289 #if IS_ENABLED(CONFIG_NFS_V4)
290 extern struct rpc_procinfo nfs4_procedures[];
291 #endif
292 
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)
297 {
298         if (!dst || !src)
299                 return NULL;
300 
301         if (src->len > NFS4_MAXLABELLEN)
302                 return NULL;
303 
304         dst->lfs = src->lfs;
305         dst->pi = src->pi;
306         dst->len = src->len;
307         memcpy(dst->label, src->label, src->len);
308 
309         return dst;
310 }
311 static inline void nfs4_label_free(struct nfs4_label *label)
312 {
313         if (label) {
314                 kfree(label->label);
315                 kfree(label);
316         }
317         return;
318 }
319 
320 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
321 {
322         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
323                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
324 }
325 #else
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)
329 {
330 }
331 static inline struct nfs4_label *
332 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
333 {
334         return NULL;
335 }
336 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
337 
338 /* proc.c */
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);
343 
344 /* dir.c */
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 *);
359 
360 /* file.c */
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);
372 
373 /* inode.c */
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);
383 
384 /* super.c */
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;
391 #endif
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 *);
405 
406 extern struct rpc_stat nfs_rpcstat;
407 
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);
412 
413 /* namespace.c */
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);
422 
423 /* getroot.c */
424 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
425                                    const char *);
426 #if IS_ENABLED(CONFIG_NFS_V4)
427 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
428                                     const char *);
429 
430 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
431 #endif
432 
433 struct nfs_pgio_completion_ops;
434 /* read.c */
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);
440 
441 /* super.c */
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);
450 
451 /* write.c */
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,
463                                int how, int flags);
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,
476                              u32 ds_commit_idx);
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,
484                       u32 ds_commit_idx);
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,
494                     struct inode *inode,
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);
499 
500 #ifdef CONFIG_MIGRATION
501 extern int nfs_migrate_page(struct address_space *,
502                 struct page *, struct page *, enum migrate_mode);
503 #else
504 #define nfs_migrate_page NULL
505 #endif
506 
507 /* unlink.c */
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);
513 
514 /* direct.c */
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)
518 {
519         inode_dio_wait(inode);
520 }
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);
523 
524 /* nfs4proc.c */
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);
535 
536 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
537 {
538         inode = igrab(inode);
539         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
540                 iput(inode);
541                 inode = NULL;
542         }
543         return inode;
544 }
545 
546 static inline void nfs_iput_and_deactive(struct inode *inode)
547 {
548         if (inode != NULL) {
549                 struct super_block *sb = inode->i_sb;
550 
551                 iput(inode);
552                 nfs_sb_deactive(sb);
553         }
554 }
555 
556 /*
557  * Determine the device name as a string
558  */
559 static inline char *nfs_devname(struct dentry *dentry,
560                                 char *buffer, ssize_t buflen)
561 {
562         char *dummy;
563         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
564 }
565 
566 /*
567  * Determine the actual block size (and log2 thereof)
568  */
569 static inline
570 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
571 {
572         /* make sure blocksize is a power of two */
573         if ((bsize & (bsize - 1)) || nrbitsp) {
574                 unsigned char   nrbits;
575 
576                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
577                         ;
578                 bsize = 1 << nrbits;
579                 if (nrbitsp)
580                         *nrbitsp = nrbits;
581         }
582 
583         return bsize;
584 }
585 
586 /*
587  * Calculate the number of 512byte blocks used.
588  */
589 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
590 {
591         blkcnt_t used = (tsize + 511) >> 9;
592         return (used > ULONG_MAX) ? ULONG_MAX : used;
593 }
594 
595 /*
596  * Compute and set NFS server blocksize
597  */
598 static inline
599 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
600 {
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;
605 
606         return nfs_block_bits(bsize, nrbitsp);
607 }
608 
609 /*
610  * Determine the maximum file size for a superblock
611  */
612 static inline
613 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
614 {
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;
618 }
619 
620 /*
621  * Record the page as unstable and mark its inode as dirty.
622  */
623 static inline
624 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
625 {
626         if (!cinfo->dreq) {
627                 struct inode *inode = page_file_mapping(page)->host;
628 
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);
632         }
633 }
634 
635 /*
636  * Determine the number of bytes of data the page contains
637  */
638 static inline
639 unsigned int nfs_page_length(struct page *page)
640 {
641         loff_t i_size = i_size_read(page_file_mapping(page)->host);
642 
643         if (i_size > 0) {
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;
650         }
651         return 0;
652 }
653 
654 /*
655  * Convert a umode to a dirent->d_type
656  */
657 static inline
658 unsigned char nfs_umode_to_dtype(umode_t mode)
659 {
660         return (mode >> 12) & 15;
661 }
662 
663 /*
664  * Determine the number of pages in an array of length 'len' and
665  * with a base offset of 'base'
666  */
667 static inline
668 unsigned int nfs_page_array_len(unsigned int base, size_t len)
669 {
670         return ((unsigned long)len + (unsigned long)base +
671                 PAGE_SIZE - 1) >> PAGE_SHIFT;
672 }
673 
674 /*
675  * Convert a struct timespec into a 64-bit change attribute
676  *
677  * This does approximately the same thing as timespec_to_ns(),
678  * but for calculation efficiency, we multiply the seconds by
679  * 1024*1024*1024.
680  */
681 static inline
682 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
683 {
684         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
685 }
686 
687 #ifdef CONFIG_CRC32
688 /**
689  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
690  * @fh - pointer to filehandle
691  *
692  * returns a crc32 hash for the filehandle that is compatible with
693  * the one displayed by "wireshark".
694  */
695 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
696 {
697         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
698 }
699 #else
700 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
701 {
702         return 0;
703 }
704 #endif
705 

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