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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 #include <linux/wait_bit.h>
 11 
 12 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
 13 
 14 extern const struct export_operations nfs_export_ops;
 15 
 16 struct nfs_string;
 17 
 18 /* Maximum number of readahead requests
 19  * FIXME: this should really be a sysctl so that users may tune it to suit
 20  *        their needs. People that do NFS over a slow network, might for
 21  *        instance want to reduce it to something closer to 1 for improved
 22  *        interactive response.
 23  */
 24 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
 25 
 26 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
 27 {
 28         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
 29                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
 30 }
 31 
 32 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
 33 {
 34         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
 35             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
 36              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
 37                 return 0;
 38         return 1;
 39 }
 40 
 41 struct nfs_clone_mount {
 42         const struct super_block *sb;
 43         const struct dentry *dentry;
 44         struct nfs_fh *fh;
 45         struct nfs_fattr *fattr;
 46         char *hostname;
 47         char *mnt_path;
 48         struct sockaddr *addr;
 49         size_t addrlen;
 50         rpc_authflavor_t authflavor;
 51 };
 52 
 53 /*
 54  * Note: RFC 1813 doesn't limit the number of auth flavors that
 55  * a server can return, so make something up.
 56  */
 57 #define NFS_MAX_SECFLAVORS      (12)
 58 
 59 /*
 60  * Value used if the user did not specify a port value.
 61  */
 62 #define NFS_UNSPEC_PORT         (-1)
 63 
 64 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
 65 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
 66 
 67 /*
 68  * Maximum number of pages that readdir can use for creating
 69  * a vmapped array of pages.
 70  */
 71 #define NFS_MAX_READDIR_PAGES 8
 72 
 73 struct nfs_client_initdata {
 74         unsigned long init_flags;
 75         const char *hostname;                   /* Hostname of the server */
 76         const struct sockaddr *addr;            /* Address of the server */
 77         const char *nodename;                   /* Hostname of the client */
 78         const char *ip_addr;                    /* IP address of the client */
 79         size_t addrlen;
 80         struct nfs_subversion *nfs_mod;
 81         int proto;
 82         u32 minorversion;
 83         struct net *net;
 84         const struct rpc_timeout *timeparms;
 85 };
 86 
 87 /*
 88  * In-kernel mount arguments
 89  */
 90 struct nfs_parsed_mount_data {
 91         int                     flags;
 92         unsigned int            rsize, wsize;
 93         unsigned int            timeo, retrans;
 94         unsigned int            acregmin, acregmax,
 95                                 acdirmin, acdirmax;
 96         unsigned int            namlen;
 97         unsigned int            options;
 98         unsigned int            bsize;
 99         struct nfs_auth_info    auth_info;
100         rpc_authflavor_t        selected_flavor;
101         char                    *client_address;
102         unsigned int            version;
103         unsigned int            minorversion;
104         char                    *fscache_uniq;
105         bool                    need_mount;
106 
107         struct {
108                 struct sockaddr_storage address;
109                 size_t                  addrlen;
110                 char                    *hostname;
111                 u32                     version;
112                 int                     port;
113                 unsigned short          protocol;
114         } mount_server;
115 
116         struct {
117                 struct sockaddr_storage address;
118                 size_t                  addrlen;
119                 char                    *hostname;
120                 char                    *export_path;
121                 int                     port;
122                 unsigned short          protocol;
123         } nfs_server;
124 
125         struct security_mnt_opts lsm_opts;
126         struct net              *net;
127 };
128 
129 /* mount_clnt.c */
130 struct nfs_mount_request {
131         struct sockaddr         *sap;
132         size_t                  salen;
133         char                    *hostname;
134         char                    *dirpath;
135         u32                     version;
136         unsigned short          protocol;
137         struct nfs_fh           *fh;
138         int                     noresvport;
139         unsigned int            *auth_flav_len;
140         rpc_authflavor_t        *auth_flavs;
141         struct net              *net;
142 };
143 
144 struct nfs_mount_info {
145         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
146         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
147         struct nfs_parsed_mount_data *parsed;
148         struct nfs_clone_mount *cloned;
149         struct nfs_fh *mntfh;
150 };
151 
152 extern int nfs_mount(struct nfs_mount_request *info);
153 extern void nfs_umount(const struct nfs_mount_request *info);
154 
155 /* client.c */
156 extern const struct rpc_program nfs_program;
157 extern void nfs_clients_init(struct net *net);
158 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
159 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
160 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
161 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
162 void nfs_server_insert_lists(struct nfs_server *);
163 void nfs_server_remove_lists(struct nfs_server *);
164 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
165 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
166                 rpc_authflavor_t);
167 struct nfs_server *nfs_alloc_server(void);
168 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
169 
170 extern void nfs_cleanup_cb_ident_idr(struct net *);
171 extern void nfs_put_client(struct nfs_client *);
172 extern void nfs_free_client(struct nfs_client *);
173 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
174 extern struct nfs_client *
175 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
176                                 struct nfs4_sessionid *, u32);
177 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
178                                         struct nfs_subversion *);
179 extern struct nfs_server *nfs4_create_server(
180                                         struct nfs_mount_info *,
181                                         struct nfs_subversion *);
182 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
183                                                       struct nfs_fh *);
184 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
185                                         struct sockaddr *sap, size_t salen,
186                                         struct net *net);
187 extern void nfs_free_server(struct nfs_server *server);
188 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
189                                            struct nfs_fh *,
190                                            struct nfs_fattr *,
191                                            rpc_authflavor_t);
192 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
193 extern int nfs_client_init_status(const struct nfs_client *clp);
194 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
195 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
196 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
197                                              const struct sockaddr *ds_addr,
198                                              int ds_addrlen, int ds_proto,
199                                              unsigned int ds_timeo,
200                                              unsigned int ds_retrans,
201                                              u32 minor_version);
202 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
203                                                 struct inode *);
204 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
205                         const struct sockaddr *ds_addr, int ds_addrlen,
206                         int ds_proto, unsigned int ds_timeo,
207                         unsigned int ds_retrans);
208 #ifdef CONFIG_PROC_FS
209 extern int __init nfs_fs_proc_init(void);
210 extern void nfs_fs_proc_exit(void);
211 extern int nfs_fs_proc_net_init(struct net *net);
212 extern void nfs_fs_proc_net_exit(struct net *net);
213 #else
214 static inline int nfs_fs_proc_net_init(struct net *net)
215 {
216         return 0;
217 }
218 static inline void nfs_fs_proc_net_exit(struct net *net)
219 {
220 }
221 static inline int nfs_fs_proc_init(void)
222 {
223         return 0;
224 }
225 static inline void nfs_fs_proc_exit(void)
226 {
227 }
228 #endif
229 
230 /* callback_xdr.c */
231 extern const struct svc_version nfs4_callback_version1;
232 extern const struct svc_version nfs4_callback_version4;
233 
234 struct nfs_pageio_descriptor;
235 /* pagelist.c */
236 extern int __init nfs_init_nfspagecache(void);
237 extern void nfs_destroy_nfspagecache(void);
238 extern int __init nfs_init_readpagecache(void);
239 extern void nfs_destroy_readpagecache(void);
240 extern int __init nfs_init_writepagecache(void);
241 extern void nfs_destroy_writepagecache(void);
242 
243 extern int __init nfs_init_directcache(void);
244 extern void nfs_destroy_directcache(void);
245 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
246                               struct nfs_pgio_header *hdr,
247                               void (*release)(struct nfs_pgio_header *hdr));
248 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
249 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
250 
251 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
252 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
253 void nfs_pgio_header_free(struct nfs_pgio_header *);
254 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
255 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
256                       struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
257                       const struct rpc_call_ops *call_ops, int how, int flags);
258 void nfs_free_request(struct nfs_page *req);
259 struct nfs_pgio_mirror *
260 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
261 
262 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
263 {
264         WARN_ON_ONCE(desc->pg_mirror_count < 1);
265         return desc->pg_mirror_count > 1;
266 }
267 
268 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
269                 const struct nfs_open_context *ctx2)
270 {
271         return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
272 }
273 
274 /* nfs2xdr.c */
275 extern const struct rpc_procinfo nfs_procedures[];
276 extern int nfs2_decode_dirent(struct xdr_stream *,
277                                 struct nfs_entry *, bool);
278 
279 /* nfs3xdr.c */
280 extern const struct rpc_procinfo nfs3_procedures[];
281 extern int nfs3_decode_dirent(struct xdr_stream *,
282                                 struct nfs_entry *, bool);
283 
284 /* nfs4xdr.c */
285 #if IS_ENABLED(CONFIG_NFS_V4)
286 extern int nfs4_decode_dirent(struct xdr_stream *,
287                                 struct nfs_entry *, bool);
288 #endif
289 #ifdef CONFIG_NFS_V4_1
290 extern const u32 nfs41_maxread_overhead;
291 extern const u32 nfs41_maxwrite_overhead;
292 extern const u32 nfs41_maxgetdevinfo_overhead;
293 #endif
294 
295 /* nfs4proc.c */
296 #if IS_ENABLED(CONFIG_NFS_V4)
297 extern const struct rpc_procinfo nfs4_procedures[];
298 #endif
299 
300 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
301 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
302 static inline struct nfs4_label *
303 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
304 {
305         if (!dst || !src)
306                 return NULL;
307 
308         if (src->len > NFS4_MAXLABELLEN)
309                 return NULL;
310 
311         dst->lfs = src->lfs;
312         dst->pi = src->pi;
313         dst->len = src->len;
314         memcpy(dst->label, src->label, src->len);
315 
316         return dst;
317 }
318 static inline void nfs4_label_free(struct nfs4_label *label)
319 {
320         if (label) {
321                 kfree(label->label);
322                 kfree(label);
323         }
324         return;
325 }
326 
327 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
328 {
329         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
330                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
331 }
332 #else
333 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
334 static inline void nfs4_label_free(void *label) {}
335 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
336 {
337 }
338 static inline struct nfs4_label *
339 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
340 {
341         return NULL;
342 }
343 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
344 
345 /* proc.c */
346 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
347 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
348                            const struct nfs_client_initdata *);
349 
350 /* dir.c */
351 extern void nfs_advise_use_readdirplus(struct inode *dir);
352 extern void nfs_force_use_readdirplus(struct inode *dir);
353 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
354                                             struct shrink_control *sc);
355 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
356                                            struct shrink_control *sc);
357 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
358 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
359 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
360 int nfs_rmdir(struct inode *, struct dentry *);
361 int nfs_unlink(struct inode *, struct dentry *);
362 int nfs_symlink(struct inode *, struct dentry *, const char *);
363 int nfs_link(struct dentry *, struct inode *, struct dentry *);
364 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
365 int nfs_rename(struct inode *, struct dentry *,
366                struct inode *, struct dentry *, unsigned int);
367 
368 /* file.c */
369 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
370 loff_t nfs_file_llseek(struct file *, loff_t, int);
371 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
372 int nfs_file_mmap(struct file *, struct vm_area_struct *);
373 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
374 int nfs_file_release(struct inode *, struct file *);
375 int nfs_lock(struct file *, int, struct file_lock *);
376 int nfs_flock(struct file *, int, struct file_lock *);
377 int nfs_check_flags(int);
378 
379 /* inode.c */
380 extern struct workqueue_struct *nfsiod_workqueue;
381 extern struct inode *nfs_alloc_inode(struct super_block *sb);
382 extern void nfs_destroy_inode(struct inode *);
383 extern int nfs_write_inode(struct inode *, struct writeback_control *);
384 extern int nfs_drop_inode(struct inode *);
385 extern void nfs_clear_inode(struct inode *);
386 extern void nfs_evict_inode(struct inode *);
387 void nfs_zap_acl_cache(struct inode *inode);
388 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
389 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
390 extern int nfs_wait_atomic_killable(atomic_t *p);
391 
392 /* super.c */
393 extern const struct super_operations nfs_sops;
394 extern struct file_system_type nfs_fs_type;
395 extern struct file_system_type nfs_xdev_fs_type;
396 #if IS_ENABLED(CONFIG_NFS_V4)
397 extern struct file_system_type nfs4_xdev_fs_type;
398 extern struct file_system_type nfs4_referral_fs_type;
399 #endif
400 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
401 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
402                         struct nfs_subversion *);
403 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
404 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
405 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
406                                    struct nfs_mount_info *, struct nfs_subversion *);
407 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
408 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
409                 const char *, struct nfs_mount_info *);
410 void nfs_kill_super(struct super_block *);
411 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
412 
413 extern struct rpc_stat nfs_rpcstat;
414 
415 extern int __init register_nfs_fs(void);
416 extern void __exit unregister_nfs_fs(void);
417 extern bool nfs_sb_active(struct super_block *sb);
418 extern void nfs_sb_deactive(struct super_block *sb);
419 
420 /* io.c */
421 extern void nfs_start_io_read(struct inode *inode);
422 extern void nfs_end_io_read(struct inode *inode);
423 extern void nfs_start_io_write(struct inode *inode);
424 extern void nfs_end_io_write(struct inode *inode);
425 extern void nfs_start_io_direct(struct inode *inode);
426 extern void nfs_end_io_direct(struct inode *inode);
427 
428 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
429 {
430         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
431 }
432 
433 /* namespace.c */
434 #define NFS_PATH_CANONICAL 1
435 extern char *nfs_path(char **p, struct dentry *dentry,
436                       char *buffer, ssize_t buflen, unsigned flags);
437 extern struct vfsmount *nfs_d_automount(struct path *path);
438 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
439                               struct nfs_fh *, struct nfs_fattr *);
440 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
441                                  struct nfs_fattr *, rpc_authflavor_t);
442 
443 /* getroot.c */
444 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
445                                    const char *);
446 #if IS_ENABLED(CONFIG_NFS_V4)
447 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
448                                     const char *);
449 
450 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
451 #endif
452 
453 struct nfs_pgio_completion_ops;
454 /* read.c */
455 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
456                         struct inode *inode, bool force_mds,
457                         const struct nfs_pgio_completion_ops *compl_ops);
458 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
459 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
460 
461 /* super.c */
462 void nfs_umount_begin(struct super_block *);
463 int  nfs_statfs(struct dentry *, struct kstatfs *);
464 int  nfs_show_options(struct seq_file *, struct dentry *);
465 int  nfs_show_devname(struct seq_file *, struct dentry *);
466 int  nfs_show_path(struct seq_file *, struct dentry *);
467 int  nfs_show_stats(struct seq_file *, struct dentry *);
468 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
469 
470 /* write.c */
471 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
472                         struct inode *inode, int ioflags, bool force_mds,
473                         const struct nfs_pgio_completion_ops *compl_ops);
474 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
475 extern void nfs_commit_free(struct nfs_commit_data *p);
476 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
477 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
478 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
479                                struct nfs_commit_data *data,
480                                const struct nfs_rpc_ops *nfs_ops,
481                                const struct rpc_call_ops *call_ops,
482                                int how, int flags);
483 extern void nfs_init_commit(struct nfs_commit_data *data,
484                             struct list_head *head,
485                             struct pnfs_layout_segment *lseg,
486                             struct nfs_commit_info *cinfo);
487 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
488                          struct nfs_commit_info *cinfo, int max);
489 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
490 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
491                     struct nfs_commit_info *cinfo);
492 void nfs_mark_request_commit(struct nfs_page *req,
493                              struct pnfs_layout_segment *lseg,
494                              struct nfs_commit_info *cinfo,
495                              u32 ds_commit_idx);
496 int nfs_write_need_commit(struct nfs_pgio_header *);
497 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
498 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
499                             int how, struct nfs_commit_info *cinfo);
500 void nfs_retry_commit(struct list_head *page_list,
501                       struct pnfs_layout_segment *lseg,
502                       struct nfs_commit_info *cinfo,
503                       u32 ds_commit_idx);
504 void nfs_commitdata_release(struct nfs_commit_data *data);
505 void nfs_request_add_commit_list(struct nfs_page *req,
506                                  struct nfs_commit_info *cinfo);
507 void nfs_request_add_commit_list_locked(struct nfs_page *req,
508                 struct list_head *dst,
509                 struct nfs_commit_info *cinfo);
510 void nfs_request_remove_commit_list(struct nfs_page *req,
511                                     struct nfs_commit_info *cinfo);
512 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
513                     struct inode *inode,
514                     struct nfs_direct_req *dreq);
515 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
516 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
517 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
518 
519 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
520                 loff_t lstart, loff_t lend);
521 
522 #ifdef CONFIG_NFS_V4_1
523 static inline
524 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
525 {
526         int i;
527 
528         for (i = 0; i < cinfo->nbuckets; i++)
529                 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
530 }
531 #else
532 static inline
533 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
534 {
535 }
536 #endif
537 
538 #ifdef CONFIG_MIGRATION
539 extern int nfs_migrate_page(struct address_space *,
540                 struct page *, struct page *, enum migrate_mode);
541 #endif
542 
543 static inline int
544 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
545                 const struct nfs_write_verifier *v2)
546 {
547         return memcmp(v1->data, v2->data, sizeof(v1->data));
548 }
549 
550 /* unlink.c */
551 extern struct rpc_task *
552 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
553                  struct dentry *old_dentry, struct dentry *new_dentry,
554                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
555 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
556 
557 /* direct.c */
558 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
559                               struct nfs_direct_req *dreq);
560 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
561 
562 /* nfs4proc.c */
563 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
564                             const struct nfs_client_initdata *);
565 extern int nfs40_walk_client_list(struct nfs_client *clp,
566                                 struct nfs_client **result,
567                                 struct rpc_cred *cred);
568 extern int nfs41_walk_client_list(struct nfs_client *clp,
569                                 struct nfs_client **result,
570                                 struct rpc_cred *cred);
571 extern int nfs4_test_session_trunk(struct rpc_clnt *,
572                                 struct rpc_xprt *,
573                                 void *);
574 
575 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
576 {
577         inode = igrab(inode);
578         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
579                 iput(inode);
580                 inode = NULL;
581         }
582         return inode;
583 }
584 
585 static inline void nfs_iput_and_deactive(struct inode *inode)
586 {
587         if (inode != NULL) {
588                 struct super_block *sb = inode->i_sb;
589 
590                 iput(inode);
591                 nfs_sb_deactive(sb);
592         }
593 }
594 
595 /*
596  * Determine the device name as a string
597  */
598 static inline char *nfs_devname(struct dentry *dentry,
599                                 char *buffer, ssize_t buflen)
600 {
601         char *dummy;
602         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
603 }
604 
605 /*
606  * Determine the actual block size (and log2 thereof)
607  */
608 static inline
609 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
610 {
611         /* make sure blocksize is a power of two */
612         if ((bsize & (bsize - 1)) || nrbitsp) {
613                 unsigned char   nrbits;
614 
615                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
616                         ;
617                 bsize = 1 << nrbits;
618                 if (nrbitsp)
619                         *nrbitsp = nrbits;
620         }
621 
622         return bsize;
623 }
624 
625 /*
626  * Calculate the number of 512byte blocks used.
627  */
628 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
629 {
630         blkcnt_t used = (tsize + 511) >> 9;
631         return (used > ULONG_MAX) ? ULONG_MAX : used;
632 }
633 
634 /*
635  * Compute and set NFS server blocksize
636  */
637 static inline
638 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
639 {
640         if (bsize < NFS_MIN_FILE_IO_SIZE)
641                 bsize = NFS_DEF_FILE_IO_SIZE;
642         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
643                 bsize = NFS_MAX_FILE_IO_SIZE;
644 
645         return nfs_block_bits(bsize, nrbitsp);
646 }
647 
648 /*
649  * Determine the maximum file size for a superblock
650  */
651 static inline
652 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
653 {
654         sb->s_maxbytes = (loff_t)maxfilesize;
655         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
656                 sb->s_maxbytes = MAX_LFS_FILESIZE;
657 }
658 
659 /*
660  * Record the page as unstable and mark its inode as dirty.
661  */
662 static inline
663 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
664 {
665         if (!cinfo->dreq) {
666                 struct inode *inode = page_file_mapping(page)->host;
667 
668                 inc_node_page_state(page, NR_UNSTABLE_NFS);
669                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
670                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
671         }
672 }
673 
674 /*
675  * Determine the number of bytes of data the page contains
676  */
677 static inline
678 unsigned int nfs_page_length(struct page *page)
679 {
680         loff_t i_size = i_size_read(page_file_mapping(page)->host);
681 
682         if (i_size > 0) {
683                 pgoff_t index = page_index(page);
684                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
685                 if (index < end_index)
686                         return PAGE_SIZE;
687                 if (index == end_index)
688                         return ((i_size - 1) & ~PAGE_MASK) + 1;
689         }
690         return 0;
691 }
692 
693 /*
694  * Convert a umode to a dirent->d_type
695  */
696 static inline
697 unsigned char nfs_umode_to_dtype(umode_t mode)
698 {
699         return (mode >> 12) & 15;
700 }
701 
702 /*
703  * Determine the number of pages in an array of length 'len' and
704  * with a base offset of 'base'
705  */
706 static inline
707 unsigned int nfs_page_array_len(unsigned int base, size_t len)
708 {
709         return ((unsigned long)len + (unsigned long)base +
710                 PAGE_SIZE - 1) >> PAGE_SHIFT;
711 }
712 
713 /*
714  * Convert a struct timespec into a 64-bit change attribute
715  *
716  * This does approximately the same thing as timespec_to_ns(),
717  * but for calculation efficiency, we multiply the seconds by
718  * 1024*1024*1024.
719  */
720 static inline
721 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
722 {
723         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
724 }
725 
726 #ifdef CONFIG_CRC32
727 /**
728  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
729  * @fh - pointer to filehandle
730  *
731  * returns a crc32 hash for the filehandle that is compatible with
732  * the one displayed by "wireshark".
733  */
734 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
735 {
736         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
737 }
738 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
739 {
740         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
741                                 NFS4_STATEID_OTHER_SIZE);
742 }
743 #else
744 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
745 {
746         return 0;
747 }
748 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
749 {
750         return 0;
751 }
752 #endif
753 
754 static inline bool nfs_error_is_fatal(int err)
755 {
756         switch (err) {
757         case -ERESTARTSYS:
758         case -EACCES:
759         case -EDQUOT:
760         case -EFBIG:
761         case -EIO:
762         case -ENOSPC:
763         case -EROFS:
764         case -ESTALE:
765         case -E2BIG:
766                 return true;
767         default:
768                 return false;
769         }
770 }
771 

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