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
 13struct 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
 23static 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
 29static 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
 38struct 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
 67struct 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 */
 81struct 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 */
121struct 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
135struct 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
143extern int nfs_mount(struct nfs_mount_request *info);
144extern void nfs_umount(const struct nfs_mount_request *info);
145
146/* client.c */
147extern const struct rpc_program nfs_program;
148extern void nfs_clients_init(struct net *net);
 
149extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
150int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
151struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
152				  const struct rpc_timeout *, const char *,
153				  rpc_authflavor_t);
154int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
155void nfs_server_insert_lists(struct nfs_server *);
156void nfs_server_remove_lists(struct nfs_server *);
157void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
158int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
159		rpc_authflavor_t);
160struct nfs_server *nfs_alloc_server(void);
161void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
162
163extern void nfs_cleanup_cb_ident_idr(struct net *);
164extern void nfs_put_client(struct nfs_client *);
165extern void nfs_free_client(struct nfs_client *);
166extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
167extern struct nfs_client *
168nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
169				struct nfs4_sessionid *, u32);
170extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
171					struct nfs_subversion *);
172extern struct nfs_server *nfs4_create_server(
173					struct nfs_mount_info *,
174					struct nfs_subversion *);
175extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
176						      struct nfs_fh *);
177extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
178					struct sockaddr *sap, size_t salen,
179					struct net *net);
180extern void nfs_free_server(struct nfs_server *server);
181extern struct nfs_server *nfs_clone_server(struct nfs_server *,
182					   struct nfs_fh *,
183					   struct nfs_fattr *,
184					   rpc_authflavor_t);
 
 
185extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
186extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
187extern 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);
194extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
195						struct inode *);
196extern 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
201extern int __init nfs_fs_proc_init(void);
202extern void nfs_fs_proc_exit(void);
203extern int nfs_fs_proc_net_init(struct net *net);
204extern void nfs_fs_proc_net_exit(struct net *net);
205#else
206static inline int nfs_fs_proc_net_init(struct net *net)
207{
208	return 0;
209}
210static inline void nfs_fs_proc_net_exit(struct net *net)
211{
212}
213static inline int nfs_fs_proc_init(void)
214{
215	return 0;
216}
217static inline void nfs_fs_proc_exit(void)
218{
219}
220#endif
221
222/* callback_xdr.c */
223extern struct svc_version nfs4_callback_version1;
224extern struct svc_version nfs4_callback_version4;
 
 
 
225
226struct nfs_pageio_descriptor;
227/* pagelist.c */
228extern int __init nfs_init_nfspagecache(void);
229extern void nfs_destroy_nfspagecache(void);
230extern int __init nfs_init_readpagecache(void);
231extern void nfs_destroy_readpagecache(void);
232extern int __init nfs_init_writepagecache(void);
233extern void nfs_destroy_writepagecache(void);
234
235extern int __init nfs_init_directcache(void);
236extern void nfs_destroy_directcache(void);
237extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
238			      struct nfs_pgio_header *hdr,
239			      void (*release)(struct nfs_pgio_header *hdr));
240void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
241int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
242
243extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
244struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
245void nfs_pgio_header_free(struct nfs_pgio_header *);
246void nfs_pgio_data_destroy(struct nfs_pgio_header *);
247int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
248int 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);
 
251void nfs_free_request(struct nfs_page *req);
252struct nfs_pgio_mirror *
253nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
254
255static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
256{
257	WARN_ON_ONCE(desc->pg_mirror_count < 1);
258	return desc->pg_mirror_count > 1;
259}
260
261static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
262		const struct nfs_open_context *ctx2)
263{
264	return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
265}
266
267/* nfs2xdr.c */
268extern struct rpc_procinfo nfs_procedures[];
269extern int nfs2_decode_dirent(struct xdr_stream *,
270				struct nfs_entry *, int);
271
272/* nfs3xdr.c */
273extern struct rpc_procinfo nfs3_procedures[];
274extern int nfs3_decode_dirent(struct xdr_stream *,
275				struct nfs_entry *, int);
276
277/* nfs4xdr.c */
278#if IS_ENABLED(CONFIG_NFS_V4)
279extern int nfs4_decode_dirent(struct xdr_stream *,
280				struct nfs_entry *, int);
281#endif
282#ifdef CONFIG_NFS_V4_1
283extern const u32 nfs41_maxread_overhead;
284extern const u32 nfs41_maxwrite_overhead;
285extern const u32 nfs41_maxgetdevinfo_overhead;
286#endif
287
288/* nfs4proc.c */
289#if IS_ENABLED(CONFIG_NFS_V4)
290extern struct rpc_procinfo nfs4_procedures[];
291#endif
292
293#ifdef CONFIG_NFS_V4_SECURITY_LABEL
294extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
295static inline struct nfs4_label *
296nfs4_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}
311static 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
320static 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
326static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
327static inline void nfs4_label_free(void *label) {}
328static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
329{
330}
331static inline struct nfs4_label *
332nfs4_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 */
339void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
340extern 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 */
345extern void nfs_force_use_readdirplus(struct inode *dir);
 
346extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
347					    struct shrink_control *sc);
348extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
349					   struct shrink_control *sc);
350struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
351int nfs_create(struct inode *, struct dentry *, umode_t, bool);
352int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 
 
 
353int nfs_rmdir(struct inode *, struct dentry *);
354int nfs_unlink(struct inode *, struct dentry *);
355int nfs_symlink(struct inode *, struct dentry *, const char *);
 
356int nfs_link(struct dentry *, struct inode *, struct dentry *);
357int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
358int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
359
360/* file.c */
361int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
362loff_t nfs_file_llseek(struct file *, loff_t, int);
363ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
364ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
365			     size_t, unsigned int);
366int nfs_file_mmap(struct file *, struct vm_area_struct *);
367ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
368int nfs_file_release(struct inode *, struct file *);
369int nfs_lock(struct file *, int, struct file_lock *);
370int nfs_flock(struct file *, int, struct file_lock *);
371int nfs_check_flags(int);
372
373/* inode.c */
374extern struct workqueue_struct *nfsiod_workqueue;
 
375extern struct inode *nfs_alloc_inode(struct super_block *sb);
376extern void nfs_destroy_inode(struct inode *);
377extern int nfs_write_inode(struct inode *, struct writeback_control *);
378extern int nfs_drop_inode(struct inode *);
379extern void nfs_clear_inode(struct inode *);
380extern void nfs_evict_inode(struct inode *);
381void nfs_zap_acl_cache(struct inode *inode);
 
 
382extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
383extern int nfs_wait_atomic_killable(atomic_t *p);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
384
385/* super.c */
386extern const struct super_operations nfs_sops;
387extern struct file_system_type nfs_fs_type;
388extern struct file_system_type nfs_xdev_fs_type;
389#if IS_ENABLED(CONFIG_NFS_V4)
390extern struct file_system_type nfs4_xdev_fs_type;
391extern struct file_system_type nfs4_referral_fs_type;
392#endif
393bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
394struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
395			struct nfs_subversion *);
396void nfs_initialise_sb(struct super_block *);
397int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
398int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
399struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
400				   struct nfs_mount_info *, struct nfs_subversion *);
401struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
402struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
403		const char *, struct nfs_mount_info *);
404void nfs_kill_super(struct super_block *);
405void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
406
407extern struct rpc_stat nfs_rpcstat;
408
409extern int __init register_nfs_fs(void);
410extern void __exit unregister_nfs_fs(void);
411extern bool nfs_sb_active(struct super_block *sb);
412extern void nfs_sb_deactive(struct super_block *sb);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
413
414/* namespace.c */
415#define NFS_PATH_CANONICAL 1
416extern char *nfs_path(char **p, struct dentry *dentry,
417		      char *buffer, ssize_t buflen, unsigned flags);
418extern struct vfsmount *nfs_d_automount(struct path *path);
419struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
420			      struct nfs_fh *, struct nfs_fattr *);
421struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
422				 struct nfs_fattr *, rpc_authflavor_t);
423
424/* getroot.c */
425extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
426				   const char *);
427#if IS_ENABLED(CONFIG_NFS_V4)
428extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
429				    const char *);
430
431extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
432#endif
433
434struct nfs_pgio_completion_ops;
435/* read.c */
 
436extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
437			struct inode *inode, bool force_mds,
438			const struct nfs_pgio_completion_ops *compl_ops);
439extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 
 
 
 
440extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
441
442/* super.c */
443void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
444void nfs_umount_begin(struct super_block *);
445int  nfs_statfs(struct dentry *, struct kstatfs *);
446int  nfs_show_options(struct seq_file *, struct dentry *);
447int  nfs_show_devname(struct seq_file *, struct dentry *);
448int  nfs_show_path(struct seq_file *, struct dentry *);
449int  nfs_show_stats(struct seq_file *, struct dentry *);
450int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
451
452/* write.c */
453extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
454			struct inode *inode, int ioflags, bool force_mds,
455			const struct nfs_pgio_completion_ops *compl_ops);
456extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
457extern void nfs_commit_free(struct nfs_commit_data *p);
458extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
459extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
460extern int nfs_initiate_commit(struct rpc_clnt *clnt,
461			       struct nfs_commit_data *data,
462			       const struct nfs_rpc_ops *nfs_ops,
463			       const struct rpc_call_ops *call_ops,
464			       int how, int flags);
 
465extern void nfs_init_commit(struct nfs_commit_data *data,
466			    struct list_head *head,
467			    struct pnfs_layout_segment *lseg,
468			    struct nfs_commit_info *cinfo);
469int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
470			 struct nfs_commit_info *cinfo, int max);
471unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
472int nfs_scan_commit(struct inode *inode, struct list_head *dst,
473		    struct nfs_commit_info *cinfo);
474void nfs_mark_request_commit(struct nfs_page *req,
475			     struct pnfs_layout_segment *lseg,
476			     struct nfs_commit_info *cinfo,
477			     u32 ds_commit_idx);
478int nfs_write_need_commit(struct nfs_pgio_header *);
479void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
480int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
481			    int how, struct nfs_commit_info *cinfo);
482void nfs_retry_commit(struct list_head *page_list,
483		      struct pnfs_layout_segment *lseg,
484		      struct nfs_commit_info *cinfo,
485		      u32 ds_commit_idx);
486void nfs_commitdata_release(struct nfs_commit_data *data);
487void nfs_request_add_commit_list(struct nfs_page *req,
488				 struct nfs_commit_info *cinfo);
489void nfs_request_add_commit_list_locked(struct nfs_page *req,
490		struct list_head *dst,
491		struct nfs_commit_info *cinfo);
492void nfs_request_remove_commit_list(struct nfs_page *req,
493				    struct nfs_commit_info *cinfo);
494void nfs_init_cinfo(struct nfs_commit_info *cinfo,
495		    struct inode *inode,
496		    struct nfs_direct_req *dreq);
497int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
498bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
499void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
500
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
501#ifdef CONFIG_MIGRATION
502extern int nfs_migrate_page(struct address_space *,
503		struct page *, struct page *, enum migrate_mode);
504#else
505#define nfs_migrate_page NULL
506#endif
507
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
508/* unlink.c */
509extern struct rpc_task *
510nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
511		 struct dentry *old_dentry, struct dentry *new_dentry,
512		 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
513extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
514
515/* direct.c */
516void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
517			      struct nfs_direct_req *dreq);
518extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
519
520/* nfs4proc.c */
521extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
522extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
523			    const struct rpc_timeout *timeparms,
524			    const char *ip_addr);
525extern int nfs40_walk_client_list(struct nfs_client *clp,
526				struct nfs_client **result,
527				struct rpc_cred *cred);
528extern int nfs41_walk_client_list(struct nfs_client *clp,
529				struct nfs_client **result,
530				struct rpc_cred *cred);
 
 
 
531
532static inline struct inode *nfs_igrab_and_active(struct inode *inode)
533{
534	inode = igrab(inode);
535	if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
536		iput(inode);
537		inode = NULL;
 
 
538	}
539	return inode;
540}
541
542static inline void nfs_iput_and_deactive(struct inode *inode)
543{
544	if (inode != NULL) {
545		struct super_block *sb = inode->i_sb;
546
547		iput(inode);
548		nfs_sb_deactive(sb);
549	}
550}
551
552/*
553 * Determine the device name as a string
554 */
555static inline char *nfs_devname(struct dentry *dentry,
556				char *buffer, ssize_t buflen)
557{
558	char *dummy;
559	return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
560}
561
562/*
563 * Determine the actual block size (and log2 thereof)
564 */
565static inline
566unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
567{
568	/* make sure blocksize is a power of two */
569	if ((bsize & (bsize - 1)) || nrbitsp) {
570		unsigned char	nrbits;
571
572		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
573			;
574		bsize = 1 << nrbits;
575		if (nrbitsp)
576			*nrbitsp = nrbits;
577	}
578
579	return bsize;
580}
581
582/*
583 * Calculate the number of 512byte blocks used.
584 */
585static inline blkcnt_t nfs_calc_block_size(u64 tsize)
586{
587	blkcnt_t used = (tsize + 511) >> 9;
588	return (used > ULONG_MAX) ? ULONG_MAX : used;
589}
590
591/*
592 * Compute and set NFS server blocksize
593 */
594static inline
595unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
596{
597	if (bsize < NFS_MIN_FILE_IO_SIZE)
598		bsize = NFS_DEF_FILE_IO_SIZE;
599	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
600		bsize = NFS_MAX_FILE_IO_SIZE;
601
602	return nfs_block_bits(bsize, nrbitsp);
603}
604
605/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
606 * Determine the maximum file size for a superblock
607 */
608static inline
609void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
610{
611	sb->s_maxbytes = (loff_t)maxfilesize;
612	if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
613		sb->s_maxbytes = MAX_LFS_FILESIZE;
614}
615
616/*
617 * Record the page as unstable and mark its inode as dirty.
 
618 */
619static inline
620void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
621{
622	if (!cinfo->dreq) {
623		struct inode *inode = page_file_mapping(page)->host;
624
625		inc_zone_page_state(page, NR_UNSTABLE_NFS);
626		inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
 
 
 
 
627		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
628	}
629}
630
631/*
632 * Determine the number of bytes of data the page contains
633 */
634static inline
635unsigned int nfs_page_length(struct page *page)
636{
637	loff_t i_size = i_size_read(page_file_mapping(page)->host);
638
639	if (i_size > 0) {
640		pgoff_t page_index = page_file_index(page);
641		pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
642		if (page_index < end_index)
643			return PAGE_SIZE;
644		if (page_index == end_index)
645			return ((i_size - 1) & ~PAGE_MASK) + 1;
646	}
647	return 0;
648}
649
650/*
651 * Convert a umode to a dirent->d_type
652 */
653static inline
654unsigned char nfs_umode_to_dtype(umode_t mode)
655{
656	return (mode >> 12) & 15;
657}
658
659/*
660 * Determine the number of pages in an array of length 'len' and
661 * with a base offset of 'base'
662 */
663static inline
664unsigned int nfs_page_array_len(unsigned int base, size_t len)
665{
666	return ((unsigned long)len + (unsigned long)base +
667		PAGE_SIZE - 1) >> PAGE_SHIFT;
668}
669
670/*
671 * Convert a struct timespec into a 64-bit change attribute
672 *
673 * This does approximately the same thing as timespec_to_ns(),
674 * but for calculation efficiency, we multiply the seconds by
675 * 1024*1024*1024.
676 */
677static inline
678u64 nfs_timespec_to_change_attr(const struct timespec *ts)
679{
680	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
681}
682
683#ifdef CONFIG_CRC32
684/**
685 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
686 * @fh - pointer to filehandle
687 *
688 * returns a crc32 hash for the filehandle that is compatible with
689 * the one displayed by "wireshark".
690 */
691static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
692{
693	return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
694}
695static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
696{
697	return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
698				NFS4_STATEID_OTHER_SIZE);
699}
700#else
701static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
702{
703	return 0;
704}
705static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
706{
707	return 0;
708}
709#endif
710
711static inline bool nfs_error_is_fatal(int err)
712{
713	switch (err) {
714	case -ERESTARTSYS:
 
 
 
 
715	case -EIO:
716	case -ENOSPC:
717	case -EROFS:
 
718	case -E2BIG:
 
 
719		return true;
720	default:
721		return false;
722	}
723}