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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * NFS internal definitions
  4  */
  5 
  6 #include "nfs4_fs.h"
  7 #include <linux/mount.h>
  8 #include <linux/security.h>
  9 #include <linux/crc32.h>
 10 #include <linux/nfs_page.h>
 11 #include <linux/wait_bit.h>
 12 
 13 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
 14 
 15 extern const struct export_operations nfs_export_ops;
 16 
 17 struct nfs_string;
 18 
 19 /* Maximum number of readahead requests
 20  * FIXME: this should really be a sysctl so that users may tune it to suit
 21  *        their needs. People that do NFS over a slow network, might for
 22  *        instance want to reduce it to something closer to 1 for improved
 23  *        interactive response.
 24  */
 25 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
 26 
 27 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
 28 {
 29         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
 30                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
 31 }
 32 
 33 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
 34 {
 35         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
 36             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
 37              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
 38                 return 0;
 39         return 1;
 40 }
 41 
 42 struct nfs_clone_mount {
 43         const struct super_block *sb;
 44         const struct dentry *dentry;
 45         struct nfs_fh *fh;
 46         struct nfs_fattr *fattr;
 47         char *hostname;
 48         char *mnt_path;
 49         struct sockaddr *addr;
 50         size_t addrlen;
 51         rpc_authflavor_t authflavor;
 52 };
 53 
 54 /*
 55  * Note: RFC 1813 doesn't limit the number of auth flavors that
 56  * a server can return, so make something up.
 57  */
 58 #define NFS_MAX_SECFLAVORS      (12)
 59 
 60 /*
 61  * Value used if the user did not specify a port value.
 62  */
 63 #define NFS_UNSPEC_PORT         (-1)
 64 
 65 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
 66 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
 67 
 68 /*
 69  * Maximum number of pages that readdir can use for creating
 70  * a vmapped array of pages.
 71  */
 72 #define NFS_MAX_READDIR_PAGES 8
 73 
 74 struct nfs_client_initdata {
 75         unsigned long init_flags;
 76         const char *hostname;                   /* Hostname of the server */
 77         const struct sockaddr *addr;            /* Address of the server */
 78         const char *nodename;                   /* Hostname of the client */
 79         const char *ip_addr;                    /* IP address of the client */
 80         size_t addrlen;
 81         struct nfs_subversion *nfs_mod;
 82         int proto;
 83         u32 minorversion;
 84         struct net *net;
 85         const struct rpc_timeout *timeparms;
 86 };
 87 
 88 /*
 89  * In-kernel mount arguments
 90  */
 91 struct nfs_parsed_mount_data {
 92         int                     flags;
 93         unsigned int            rsize, wsize;
 94         unsigned int            timeo, retrans;
 95         unsigned int            acregmin, acregmax,
 96                                 acdirmin, acdirmax;
 97         unsigned int            namlen;
 98         unsigned int            options;
 99         unsigned int            bsize;
100         struct nfs_auth_info    auth_info;
101         rpc_authflavor_t        selected_flavor;
102         char                    *client_address;
103         unsigned int            version;
104         unsigned int            minorversion;
105         char                    *fscache_uniq;
106         bool                    need_mount;
107 
108         struct {
109                 struct sockaddr_storage address;
110                 size_t                  addrlen;
111                 char                    *hostname;
112                 u32                     version;
113                 int                     port;
114                 unsigned short          protocol;
115         } mount_server;
116 
117         struct {
118                 struct sockaddr_storage address;
119                 size_t                  addrlen;
120                 char                    *hostname;
121                 char                    *export_path;
122                 int                     port;
123                 unsigned short          protocol;
124         } nfs_server;
125 
126         struct security_mnt_opts lsm_opts;
127         struct net              *net;
128 };
129 
130 /* mount_clnt.c */
131 struct nfs_mount_request {
132         struct sockaddr         *sap;
133         size_t                  salen;
134         char                    *hostname;
135         char                    *dirpath;
136         u32                     version;
137         unsigned short          protocol;
138         struct nfs_fh           *fh;
139         int                     noresvport;
140         unsigned int            *auth_flav_len;
141         rpc_authflavor_t        *auth_flavs;
142         struct net              *net;
143 };
144 
145 struct nfs_mount_info {
146         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
147         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
148         struct nfs_parsed_mount_data *parsed;
149         struct nfs_clone_mount *cloned;
150         struct nfs_fh *mntfh;
151 };
152 
153 extern int nfs_mount(struct nfs_mount_request *info);
154 extern void nfs_umount(const struct nfs_mount_request *info);
155 
156 /* client.c */
157 extern const struct rpc_program nfs_program;
158 extern void nfs_clients_init(struct net *net);
159 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
160 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
161 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
162 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
163 void nfs_server_insert_lists(struct nfs_server *);
164 void nfs_server_remove_lists(struct nfs_server *);
165 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
166 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
167                 rpc_authflavor_t);
168 struct nfs_server *nfs_alloc_server(void);
169 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
170 
171 extern void nfs_cleanup_cb_ident_idr(struct net *);
172 extern void nfs_put_client(struct nfs_client *);
173 extern void nfs_free_client(struct nfs_client *);
174 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
175 extern struct nfs_client *
176 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
177                                 struct nfs4_sessionid *, u32);
178 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
179                                         struct nfs_subversion *);
180 extern struct nfs_server *nfs4_create_server(
181                                         struct nfs_mount_info *,
182                                         struct nfs_subversion *);
183 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
184                                                       struct nfs_fh *);
185 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
186                                         struct sockaddr *sap, size_t salen,
187                                         struct net *net);
188 extern void nfs_free_server(struct nfs_server *server);
189 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
190                                            struct nfs_fh *,
191                                            struct nfs_fattr *,
192                                            rpc_authflavor_t);
193 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
194 extern int nfs_client_init_status(const struct nfs_client *clp);
195 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
196 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
197 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
198                                              const struct sockaddr *ds_addr,
199                                              int ds_addrlen, int ds_proto,
200                                              unsigned int ds_timeo,
201                                              unsigned int ds_retrans,
202                                              u32 minor_version);
203 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
204                                                 struct inode *);
205 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
206                         const struct sockaddr *ds_addr, int ds_addrlen,
207                         int ds_proto, unsigned int ds_timeo,
208                         unsigned int ds_retrans);
209 #ifdef CONFIG_PROC_FS
210 extern int __init nfs_fs_proc_init(void);
211 extern void nfs_fs_proc_exit(void);
212 extern int nfs_fs_proc_net_init(struct net *net);
213 extern void nfs_fs_proc_net_exit(struct net *net);
214 #else
215 static inline int nfs_fs_proc_net_init(struct net *net)
216 {
217         return 0;
218 }
219 static inline void nfs_fs_proc_net_exit(struct net *net)
220 {
221 }
222 static inline int nfs_fs_proc_init(void)
223 {
224         return 0;
225 }
226 static inline void nfs_fs_proc_exit(void)
227 {
228 }
229 #endif
230 
231 /* callback_xdr.c */
232 extern const struct svc_version nfs4_callback_version1;
233 extern const struct svc_version nfs4_callback_version4;
234 
235 struct nfs_pageio_descriptor;
236 /* pagelist.c */
237 extern int __init nfs_init_nfspagecache(void);
238 extern void nfs_destroy_nfspagecache(void);
239 extern int __init nfs_init_readpagecache(void);
240 extern void nfs_destroy_readpagecache(void);
241 extern int __init nfs_init_writepagecache(void);
242 extern void nfs_destroy_writepagecache(void);
243 
244 extern int __init nfs_init_directcache(void);
245 extern void nfs_destroy_directcache(void);
246 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
247                               struct nfs_pgio_header *hdr,
248                               void (*release)(struct nfs_pgio_header *hdr));
249 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
250 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
251 
252 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
253 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
254 void nfs_pgio_header_free(struct nfs_pgio_header *);
255 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
256 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
257                       struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
258                       const struct rpc_call_ops *call_ops, int how, int flags);
259 void nfs_free_request(struct nfs_page *req);
260 struct nfs_pgio_mirror *
261 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
262 
263 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
264 {
265         WARN_ON_ONCE(desc->pg_mirror_count < 1);
266         return desc->pg_mirror_count > 1;
267 }
268 
269 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
270                 const struct nfs_open_context *ctx2)
271 {
272         return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
273 }
274 
275 /* nfs2xdr.c */
276 extern const struct rpc_procinfo nfs_procedures[];
277 extern int nfs2_decode_dirent(struct xdr_stream *,
278                                 struct nfs_entry *, bool);
279 
280 /* nfs3xdr.c */
281 extern const struct rpc_procinfo nfs3_procedures[];
282 extern int nfs3_decode_dirent(struct xdr_stream *,
283                                 struct nfs_entry *, bool);
284 
285 /* nfs4xdr.c */
286 #if IS_ENABLED(CONFIG_NFS_V4)
287 extern int nfs4_decode_dirent(struct xdr_stream *,
288                                 struct nfs_entry *, bool);
289 #endif
290 #ifdef CONFIG_NFS_V4_1
291 extern const u32 nfs41_maxread_overhead;
292 extern const u32 nfs41_maxwrite_overhead;
293 extern const u32 nfs41_maxgetdevinfo_overhead;
294 #endif
295 
296 /* nfs4proc.c */
297 #if IS_ENABLED(CONFIG_NFS_V4)
298 extern const struct rpc_procinfo nfs4_procedures[];
299 #endif
300 
301 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
302 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
303 static inline struct nfs4_label *
304 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
305 {
306         if (!dst || !src)
307                 return NULL;
308 
309         if (src->len > NFS4_MAXLABELLEN)
310                 return NULL;
311 
312         dst->lfs = src->lfs;
313         dst->pi = src->pi;
314         dst->len = src->len;
315         memcpy(dst->label, src->label, src->len);
316 
317         return dst;
318 }
319 static inline void nfs4_label_free(struct nfs4_label *label)
320 {
321         if (label) {
322                 kfree(label->label);
323                 kfree(label);
324         }
325         return;
326 }
327 
328 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
329 {
330         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
331                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
332 }
333 #else
334 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
335 static inline void nfs4_label_free(void *label) {}
336 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
337 {
338 }
339 static inline struct nfs4_label *
340 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
341 {
342         return NULL;
343 }
344 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
345 
346 /* proc.c */
347 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
348 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
349                            const struct nfs_client_initdata *);
350 
351 /* dir.c */
352 extern void nfs_advise_use_readdirplus(struct inode *dir);
353 extern void nfs_force_use_readdirplus(struct inode *dir);
354 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
355                                             struct shrink_control *sc);
356 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
357                                            struct shrink_control *sc);
358 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
359 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
360 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
361 int nfs_rmdir(struct inode *, struct dentry *);
362 int nfs_unlink(struct inode *, struct dentry *);
363 int nfs_symlink(struct inode *, struct dentry *, const char *);
364 int nfs_link(struct dentry *, struct inode *, struct dentry *);
365 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
366 int nfs_rename(struct inode *, struct dentry *,
367                struct inode *, struct dentry *, unsigned int);
368 
369 /* file.c */
370 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
371 loff_t nfs_file_llseek(struct file *, loff_t, int);
372 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
373 int nfs_file_mmap(struct file *, struct vm_area_struct *);
374 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
375 int nfs_file_release(struct inode *, struct file *);
376 int nfs_lock(struct file *, int, struct file_lock *);
377 int nfs_flock(struct file *, int, struct file_lock *);
378 int nfs_check_flags(int);
379 
380 /* inode.c */
381 extern struct workqueue_struct *nfsiod_workqueue;
382 extern struct inode *nfs_alloc_inode(struct super_block *sb);
383 extern void nfs_destroy_inode(struct inode *);
384 extern int nfs_write_inode(struct inode *, struct writeback_control *);
385 extern int nfs_drop_inode(struct inode *);
386 extern void nfs_clear_inode(struct inode *);
387 extern void nfs_evict_inode(struct inode *);
388 void nfs_zap_acl_cache(struct inode *inode);
389 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
390 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
391 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
392 
393 /* super.c */
394 extern const struct super_operations nfs_sops;
395 extern struct file_system_type nfs_fs_type;
396 extern struct file_system_type nfs_xdev_fs_type;
397 #if IS_ENABLED(CONFIG_NFS_V4)
398 extern struct file_system_type nfs4_xdev_fs_type;
399 extern struct file_system_type nfs4_referral_fs_type;
400 #endif
401 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
402 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
403                         struct nfs_subversion *);
404 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
405 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
406 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
407                                    struct nfs_mount_info *, struct nfs_subversion *);
408 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
409 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
410                 const char *, struct nfs_mount_info *);
411 void nfs_kill_super(struct super_block *);
412 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
413 
414 extern struct rpc_stat nfs_rpcstat;
415 
416 extern int __init register_nfs_fs(void);
417 extern void __exit unregister_nfs_fs(void);
418 extern bool nfs_sb_active(struct super_block *sb);
419 extern void nfs_sb_deactive(struct super_block *sb);
420 
421 /* io.c */
422 extern void nfs_start_io_read(struct inode *inode);
423 extern void nfs_end_io_read(struct inode *inode);
424 extern void nfs_start_io_write(struct inode *inode);
425 extern void nfs_end_io_write(struct inode *inode);
426 extern void nfs_start_io_direct(struct inode *inode);
427 extern void nfs_end_io_direct(struct inode *inode);
428 
429 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
430 {
431         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
432 }
433 
434 /* namespace.c */
435 #define NFS_PATH_CANONICAL 1
436 extern char *nfs_path(char **p, struct dentry *dentry,
437                       char *buffer, ssize_t buflen, unsigned flags);
438 extern struct vfsmount *nfs_d_automount(struct path *path);
439 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
440                               struct nfs_fh *, struct nfs_fattr *);
441 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
442                                  struct nfs_fattr *, rpc_authflavor_t);
443 
444 /* getroot.c */
445 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
446                                    const char *);
447 #if IS_ENABLED(CONFIG_NFS_V4)
448 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
449                                     const char *);
450 
451 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
452 #endif
453 
454 struct nfs_pgio_completion_ops;
455 /* read.c */
456 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
457                         struct inode *inode, bool force_mds,
458                         const struct nfs_pgio_completion_ops *compl_ops);
459 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
460 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
461 
462 /* super.c */
463 void nfs_umount_begin(struct super_block *);
464 int  nfs_statfs(struct dentry *, struct kstatfs *);
465 int  nfs_show_options(struct seq_file *, struct dentry *);
466 int  nfs_show_devname(struct seq_file *, struct dentry *);
467 int  nfs_show_path(struct seq_file *, struct dentry *);
468 int  nfs_show_stats(struct seq_file *, struct dentry *);
469 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
470 
471 /* write.c */
472 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
473                         struct inode *inode, int ioflags, bool force_mds,
474                         const struct nfs_pgio_completion_ops *compl_ops);
475 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
476 extern void nfs_commit_free(struct nfs_commit_data *p);
477 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
478 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
479 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
480                                struct nfs_commit_data *data,
481                                const struct nfs_rpc_ops *nfs_ops,
482                                const struct rpc_call_ops *call_ops,
483                                int how, int flags);
484 extern void nfs_init_commit(struct nfs_commit_data *data,
485                             struct list_head *head,
486                             struct pnfs_layout_segment *lseg,
487                             struct nfs_commit_info *cinfo);
488 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
489                          struct nfs_commit_info *cinfo, int max);
490 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
491 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
492                     struct nfs_commit_info *cinfo);
493 void nfs_mark_request_commit(struct nfs_page *req,
494                              struct pnfs_layout_segment *lseg,
495                              struct nfs_commit_info *cinfo,
496                              u32 ds_commit_idx);
497 int nfs_write_need_commit(struct nfs_pgio_header *);
498 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
499 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
500                             int how, struct nfs_commit_info *cinfo);
501 void nfs_retry_commit(struct list_head *page_list,
502                       struct pnfs_layout_segment *lseg,
503                       struct nfs_commit_info *cinfo,
504                       u32 ds_commit_idx);
505 void nfs_commitdata_release(struct nfs_commit_data *data);
506 void nfs_request_add_commit_list(struct nfs_page *req,
507                                  struct nfs_commit_info *cinfo);
508 void nfs_request_add_commit_list_locked(struct nfs_page *req,
509                 struct list_head *dst,
510                 struct nfs_commit_info *cinfo);
511 void nfs_request_remove_commit_list(struct nfs_page *req,
512                                     struct nfs_commit_info *cinfo);
513 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
514                     struct inode *inode,
515                     struct nfs_direct_req *dreq);
516 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
517 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
518 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
519 
520 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
521                 loff_t lstart, loff_t lend);
522 
523 #ifdef CONFIG_NFS_V4_1
524 static inline
525 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
526 {
527         int i;
528 
529         for (i = 0; i < cinfo->nbuckets; i++)
530                 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
531 }
532 #else
533 static inline
534 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
535 {
536 }
537 #endif
538 
539 #ifdef CONFIG_MIGRATION
540 extern int nfs_migrate_page(struct address_space *,
541                 struct page *, struct page *, enum migrate_mode);
542 #endif
543 
544 static inline int
545 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
546                 const struct nfs_write_verifier *v2)
547 {
548         return memcmp(v1->data, v2->data, sizeof(v1->data));
549 }
550 
551 /* unlink.c */
552 extern struct rpc_task *
553 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
554                  struct dentry *old_dentry, struct dentry *new_dentry,
555                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
556 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
557 
558 /* direct.c */
559 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
560                               struct nfs_direct_req *dreq);
561 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
562 
563 /* nfs4proc.c */
564 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
565                             const struct nfs_client_initdata *);
566 extern int nfs40_walk_client_list(struct nfs_client *clp,
567                                 struct nfs_client **result,
568                                 struct rpc_cred *cred);
569 extern int nfs41_walk_client_list(struct nfs_client *clp,
570                                 struct nfs_client **result,
571                                 struct rpc_cred *cred);
572 extern int nfs4_test_session_trunk(struct rpc_clnt *,
573                                 struct rpc_xprt *,
574                                 void *);
575 
576 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
577 {
578         inode = igrab(inode);
579         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
580                 iput(inode);
581                 inode = NULL;
582         }
583         return inode;
584 }
585 
586 static inline void nfs_iput_and_deactive(struct inode *inode)
587 {
588         if (inode != NULL) {
589                 struct super_block *sb = inode->i_sb;
590 
591                 iput(inode);
592                 nfs_sb_deactive(sb);
593         }
594 }
595 
596 /*
597  * Determine the device name as a string
598  */
599 static inline char *nfs_devname(struct dentry *dentry,
600                                 char *buffer, ssize_t buflen)
601 {
602         char *dummy;
603         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
604 }
605 
606 /*
607  * Determine the actual block size (and log2 thereof)
608  */
609 static inline
610 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
611 {
612         /* make sure blocksize is a power of two */
613         if ((bsize & (bsize - 1)) || nrbitsp) {
614                 unsigned char   nrbits;
615 
616                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
617                         ;
618                 bsize = 1 << nrbits;
619                 if (nrbitsp)
620                         *nrbitsp = nrbits;
621         }
622 
623         return bsize;
624 }
625 
626 /*
627  * Calculate the number of 512byte blocks used.
628  */
629 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
630 {
631         blkcnt_t used = (tsize + 511) >> 9;
632         return (used > ULONG_MAX) ? ULONG_MAX : used;
633 }
634 
635 /*
636  * Compute and set NFS server blocksize
637  */
638 static inline
639 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
640 {
641         if (bsize < NFS_MIN_FILE_IO_SIZE)
642                 bsize = NFS_DEF_FILE_IO_SIZE;
643         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
644                 bsize = NFS_MAX_FILE_IO_SIZE;
645 
646         return nfs_block_bits(bsize, nrbitsp);
647 }
648 
649 /*
650  * Determine the maximum file size for a superblock
651  */
652 static inline
653 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
654 {
655         sb->s_maxbytes = (loff_t)maxfilesize;
656         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
657                 sb->s_maxbytes = MAX_LFS_FILESIZE;
658 }
659 
660 /*
661  * Record the page as unstable and mark its inode as dirty.
662  */
663 static inline
664 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
665 {
666         if (!cinfo->dreq) {
667                 struct inode *inode = page_file_mapping(page)->host;
668 
669                 inc_node_page_state(page, NR_UNSTABLE_NFS);
670                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
671                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
672         }
673 }
674 
675 /*
676  * Determine the number of bytes of data the page contains
677  */
678 static inline
679 unsigned int nfs_page_length(struct page *page)
680 {
681         loff_t i_size = i_size_read(page_file_mapping(page)->host);
682 
683         if (i_size > 0) {
684                 pgoff_t index = page_index(page);
685                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
686                 if (index < end_index)
687                         return PAGE_SIZE;
688                 if (index == end_index)
689                         return ((i_size - 1) & ~PAGE_MASK) + 1;
690         }
691         return 0;
692 }
693 
694 /*
695  * Convert a umode to a dirent->d_type
696  */
697 static inline
698 unsigned char nfs_umode_to_dtype(umode_t mode)
699 {
700         return (mode >> 12) & 15;
701 }
702 
703 /*
704  * Determine the number of pages in an array of length 'len' and
705  * with a base offset of 'base'
706  */
707 static inline
708 unsigned int nfs_page_array_len(unsigned int base, size_t len)
709 {
710         return ((unsigned long)len + (unsigned long)base +
711                 PAGE_SIZE - 1) >> PAGE_SHIFT;
712 }
713 
714 /*
715  * Convert a struct timespec into a 64-bit change attribute
716  *
717  * This does approximately the same thing as timespec_to_ns(),
718  * but for calculation efficiency, we multiply the seconds by
719  * 1024*1024*1024.
720  */
721 static inline
722 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
723 {
724         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
725 }
726 
727 #ifdef CONFIG_CRC32
728 /**
729  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
730  * @fh - pointer to filehandle
731  *
732  * returns a crc32 hash for the filehandle that is compatible with
733  * the one displayed by "wireshark".
734  */
735 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
736 {
737         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
738 }
739 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
740 {
741         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
742                                 NFS4_STATEID_OTHER_SIZE);
743 }
744 #else
745 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
746 {
747         return 0;
748 }
749 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
750 {
751         return 0;
752 }
753 #endif
754 
755 static inline bool nfs_error_is_fatal(int err)
756 {
757         switch (err) {
758         case -ERESTARTSYS:
759         case -EACCES:
760         case -EDQUOT:
761         case -EFBIG:
762         case -EIO:
763         case -ENOSPC:
764         case -EROFS:
765         case -ESTALE:
766         case -E2BIG:
767                 return true;
768         default:
769                 return false;
770         }
771 }
772 
773 static inline void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
774 {
775         ctx->error = error;
776         smp_wmb();
777         set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
778 }
779 

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