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