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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
15extern const struct export_operations nfs_export_ops;
16
17struct 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
27static 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
33static 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
42struct 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
74struct 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 */
91struct 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 */
131struct 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
145struct 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
153extern int nfs_mount(struct nfs_mount_request *info);
154extern void nfs_umount(const struct nfs_mount_request *info);
155
156/* client.c */
157extern const struct rpc_program nfs_program;
158extern void nfs_clients_init(struct net *net);
159extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
160int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
161struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
162int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
163void nfs_server_insert_lists(struct nfs_server *);
164void nfs_server_remove_lists(struct nfs_server *);
165void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
166int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
167 rpc_authflavor_t);
168struct nfs_server *nfs_alloc_server(void);
169void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
170
171extern void nfs_cleanup_cb_ident_idr(struct net *);
172extern void nfs_put_client(struct nfs_client *);
173extern void nfs_free_client(struct nfs_client *);
174extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
175extern struct nfs_client *
176nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
177 struct nfs4_sessionid *, u32);
178extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
179 struct nfs_subversion *);
180extern struct nfs_server *nfs4_create_server(
181 struct nfs_mount_info *,
182 struct nfs_subversion *);
183extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
184 struct nfs_fh *);
185extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
186 struct sockaddr *sap, size_t salen,
187 struct net *net);
188extern void nfs_free_server(struct nfs_server *server);
189extern struct nfs_server *nfs_clone_server(struct nfs_server *,
190 struct nfs_fh *,
191 struct nfs_fattr *,
192 rpc_authflavor_t);
193extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
194extern int nfs_client_init_status(const struct nfs_client *clp);
195extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
196extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
197extern 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);
203extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
204 struct inode *);
205extern 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
210extern int __init nfs_fs_proc_init(void);
211extern void nfs_fs_proc_exit(void);
212extern int nfs_fs_proc_net_init(struct net *net);
213extern void nfs_fs_proc_net_exit(struct net *net);
214#else
215static inline int nfs_fs_proc_net_init(struct net *net)
216{
217 return 0;
218}
219static inline void nfs_fs_proc_net_exit(struct net *net)
220{
221}
222static inline int nfs_fs_proc_init(void)
223{
224 return 0;
225}
226static inline void nfs_fs_proc_exit(void)
227{
228}
229#endif
230
231/* callback_xdr.c */
232extern const struct svc_version nfs4_callback_version1;
233extern const struct svc_version nfs4_callback_version4;
234
235struct nfs_pageio_descriptor;
236/* pagelist.c */
237extern int __init nfs_init_nfspagecache(void);
238extern void nfs_destroy_nfspagecache(void);
239extern int __init nfs_init_readpagecache(void);
240extern void nfs_destroy_readpagecache(void);
241extern int __init nfs_init_writepagecache(void);
242extern void nfs_destroy_writepagecache(void);
243
244extern int __init nfs_init_directcache(void);
245extern void nfs_destroy_directcache(void);
246extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
247 struct nfs_pgio_header *hdr,
248 void (*release)(struct nfs_pgio_header *hdr));
249void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
250int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
251
252extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
253struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
254void nfs_pgio_header_free(struct nfs_pgio_header *);
255int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
256int 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);
259void nfs_free_request(struct nfs_page *req);
260struct nfs_pgio_mirror *
261nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
262
263static 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
269static 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 */
276extern const struct rpc_procinfo nfs_procedures[];
277extern int nfs2_decode_dirent(struct xdr_stream *,
278 struct nfs_entry *, bool);
279
280/* nfs3xdr.c */
281extern const struct rpc_procinfo nfs3_procedures[];
282extern int nfs3_decode_dirent(struct xdr_stream *,
283 struct nfs_entry *, bool);
284
285/* nfs4xdr.c */
286#if IS_ENABLED(CONFIG_NFS_V4)
287extern int nfs4_decode_dirent(struct xdr_stream *,
288 struct nfs_entry *, bool);
289#endif
290#ifdef CONFIG_NFS_V4_1
291extern const u32 nfs41_maxread_overhead;
292extern const u32 nfs41_maxwrite_overhead;
293extern const u32 nfs41_maxgetdevinfo_overhead;
294#endif
295
296/* nfs4proc.c */
297#if IS_ENABLED(CONFIG_NFS_V4)
298extern const struct rpc_procinfo nfs4_procedures[];
299#endif
300
301#ifdef CONFIG_NFS_V4_SECURITY_LABEL
302extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
303static inline struct nfs4_label *
304nfs4_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}
319static 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
328static 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
334static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
335static inline void nfs4_label_free(void *label) {}
336static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
337{
338}
339static inline struct nfs4_label *
340nfs4_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 */
347void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
348extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
349 const struct nfs_client_initdata *);
350
351/* dir.c */
352extern void nfs_advise_use_readdirplus(struct inode *dir);
353extern void nfs_force_use_readdirplus(struct inode *dir);
354extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
355 struct shrink_control *sc);
356extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
357 struct shrink_control *sc);
358struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
359int nfs_create(struct inode *, struct dentry *, umode_t, bool);
360int nfs_mkdir(struct inode *, struct dentry *, umode_t);
361int nfs_rmdir(struct inode *, struct dentry *);
362int nfs_unlink(struct inode *, struct dentry *);
363int nfs_symlink(struct inode *, struct dentry *, const char *);
364int nfs_link(struct dentry *, struct inode *, struct dentry *);
365int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
366int nfs_rename(struct inode *, struct dentry *,
367 struct inode *, struct dentry *, unsigned int);
368
369/* file.c */
370int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
371loff_t nfs_file_llseek(struct file *, loff_t, int);
372ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
373int nfs_file_mmap(struct file *, struct vm_area_struct *);
374ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
375int nfs_file_release(struct inode *, struct file *);
376int nfs_lock(struct file *, int, struct file_lock *);
377int nfs_flock(struct file *, int, struct file_lock *);
378int nfs_check_flags(int);
379
380/* inode.c */
381extern struct workqueue_struct *nfsiod_workqueue;
382extern struct inode *nfs_alloc_inode(struct super_block *sb);
383extern void nfs_destroy_inode(struct inode *);
384extern int nfs_write_inode(struct inode *, struct writeback_control *);
385extern int nfs_drop_inode(struct inode *);
386extern void nfs_clear_inode(struct inode *);
387extern void nfs_evict_inode(struct inode *);
388void nfs_zap_acl_cache(struct inode *inode);
389extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
390extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
391extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
392
393/* super.c */
394extern const struct super_operations nfs_sops;
395extern struct file_system_type nfs_fs_type;
396extern struct file_system_type nfs_xdev_fs_type;
397#if IS_ENABLED(CONFIG_NFS_V4)
398extern struct file_system_type nfs4_xdev_fs_type;
399extern struct file_system_type nfs4_referral_fs_type;
400#endif
401bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
402struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
403 struct nfs_subversion *);
404int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
405int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
406struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
407 struct nfs_mount_info *, struct nfs_subversion *);
408struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
409struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
410 const char *, struct nfs_mount_info *);
411void nfs_kill_super(struct super_block *);
412void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
413
414extern struct rpc_stat nfs_rpcstat;
415
416extern int __init register_nfs_fs(void);
417extern void __exit unregister_nfs_fs(void);
418extern bool nfs_sb_active(struct super_block *sb);
419extern void nfs_sb_deactive(struct super_block *sb);
420
421/* io.c */
422extern void nfs_start_io_read(struct inode *inode);
423extern void nfs_end_io_read(struct inode *inode);
424extern void nfs_start_io_write(struct inode *inode);
425extern void nfs_end_io_write(struct inode *inode);
426extern void nfs_start_io_direct(struct inode *inode);
427extern void nfs_end_io_direct(struct inode *inode);
428
429static 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
436extern char *nfs_path(char **p, struct dentry *dentry,
437 char *buffer, ssize_t buflen, unsigned flags);
438extern struct vfsmount *nfs_d_automount(struct path *path);
439struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
440 struct nfs_fh *, struct nfs_fattr *);
441struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
442 struct nfs_fattr *, rpc_authflavor_t);
443
444/* getroot.c */
445extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
446 const char *);
447#if IS_ENABLED(CONFIG_NFS_V4)
448extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
449 const char *);
450
451extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
452#endif
453
454struct nfs_pgio_completion_ops;
455/* read.c */
456extern 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);
459extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
460extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
461
462/* super.c */
463void nfs_umount_begin(struct super_block *);
464int nfs_statfs(struct dentry *, struct kstatfs *);
465int nfs_show_options(struct seq_file *, struct dentry *);
466int nfs_show_devname(struct seq_file *, struct dentry *);
467int nfs_show_path(struct seq_file *, struct dentry *);
468int nfs_show_stats(struct seq_file *, struct dentry *);
469int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
470
471/* write.c */
472extern 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);
475extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
476extern void nfs_commit_free(struct nfs_commit_data *p);
477extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
478extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
479extern 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);
484extern 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);
488int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
489 struct nfs_commit_info *cinfo, int max);
490unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
491int nfs_scan_commit(struct inode *inode, struct list_head *dst,
492 struct nfs_commit_info *cinfo);
493void 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);
497int nfs_write_need_commit(struct nfs_pgio_header *);
498void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
499int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
500 int how, struct nfs_commit_info *cinfo);
501void 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);
505void nfs_commitdata_release(struct nfs_commit_data *data);
506void nfs_request_add_commit_list(struct nfs_page *req,
507 struct nfs_commit_info *cinfo);
508void nfs_request_add_commit_list_locked(struct nfs_page *req,
509 struct list_head *dst,
510 struct nfs_commit_info *cinfo);
511void nfs_request_remove_commit_list(struct nfs_page *req,
512 struct nfs_commit_info *cinfo);
513void nfs_init_cinfo(struct nfs_commit_info *cinfo,
514 struct inode *inode,
515 struct nfs_direct_req *dreq);
516int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
517bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
518void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
519
520int nfs_filemap_write_and_wait_range(struct address_space *mapping,
521 loff_t lstart, loff_t lend);
522
523#ifdef CONFIG_NFS_V4_1
524static inline
525void 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
533static inline
534void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
535{
536}
537#endif
538
539#ifdef CONFIG_MIGRATION
540extern int nfs_migrate_page(struct address_space *,
541 struct page *, struct page *, enum migrate_mode);
542#endif
543
544static inline int
545nfs_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 */
552extern struct rpc_task *
553nfs_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 *));
556extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
557
558/* direct.c */
559void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
560 struct nfs_direct_req *dreq);
561extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
562
563/* nfs4proc.c */
564extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
565 const struct nfs_client_initdata *);
566extern int nfs40_walk_client_list(struct nfs_client *clp,
567 struct nfs_client **result,
568 struct rpc_cred *cred);
569extern int nfs41_walk_client_list(struct nfs_client *clp,
570 struct nfs_client **result,
571 struct rpc_cred *cred);
572extern int nfs4_test_session_trunk(struct rpc_clnt *,
573 struct rpc_xprt *,
574 void *);
575
576static 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
586static 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 */
599static 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 */
609static inline
610unsigned 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 */
629static 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 */
638static inline
639unsigned 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 */
652static inline
653void 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 */
663static inline
664void 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 */
678static inline
679unsigned 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 */
697static inline
698unsigned 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 */
707static inline
708unsigned 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 */
721static inline
722u64 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 */
735static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
736{
737 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
738}
739static 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
745static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
746{
747 return 0;
748}
749static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
750{
751 return 0;
752}
753#endif
754
755static 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
773static 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}
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 int nfs_wait_client_init_complete(const struct nfs_client *clp);
190extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
191extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
192 const struct sockaddr *ds_addr,
193 int ds_addrlen, int ds_proto,
194 unsigned int ds_timeo,
195 unsigned int ds_retrans,
196 u32 minor_version);
197extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
198 struct inode *);
199extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
200 const struct sockaddr *ds_addr, int ds_addrlen,
201 int ds_proto, unsigned int ds_timeo,
202 unsigned int ds_retrans);
203#ifdef CONFIG_PROC_FS
204extern int __init nfs_fs_proc_init(void);
205extern void nfs_fs_proc_exit(void);
206extern int nfs_fs_proc_net_init(struct net *net);
207extern void nfs_fs_proc_net_exit(struct net *net);
208#else
209static inline int nfs_fs_proc_net_init(struct net *net)
210{
211 return 0;
212}
213static inline void nfs_fs_proc_net_exit(struct net *net)
214{
215}
216static inline int nfs_fs_proc_init(void)
217{
218 return 0;
219}
220static inline void nfs_fs_proc_exit(void)
221{
222}
223#endif
224
225/* callback_xdr.c */
226extern struct svc_version nfs4_callback_version1;
227extern struct svc_version nfs4_callback_version4;
228
229struct nfs_pageio_descriptor;
230/* pagelist.c */
231extern int __init nfs_init_nfspagecache(void);
232extern void nfs_destroy_nfspagecache(void);
233extern int __init nfs_init_readpagecache(void);
234extern void nfs_destroy_readpagecache(void);
235extern int __init nfs_init_writepagecache(void);
236extern void nfs_destroy_writepagecache(void);
237
238extern int __init nfs_init_directcache(void);
239extern void nfs_destroy_directcache(void);
240extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
241 struct nfs_pgio_header *hdr,
242 void (*release)(struct nfs_pgio_header *hdr));
243void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
244int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
245
246extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
247struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
248void nfs_pgio_header_free(struct nfs_pgio_header *);
249void nfs_pgio_data_destroy(struct nfs_pgio_header *);
250int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
251int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
252 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
253 const struct rpc_call_ops *call_ops, int how, int flags);
254void nfs_free_request(struct nfs_page *req);
255struct nfs_pgio_mirror *
256nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
257
258static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
259{
260 WARN_ON_ONCE(desc->pg_mirror_count < 1);
261 return desc->pg_mirror_count > 1;
262}
263
264static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
265 const struct nfs_open_context *ctx2)
266{
267 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
268}
269
270/* nfs2xdr.c */
271extern struct rpc_procinfo nfs_procedures[];
272extern int nfs2_decode_dirent(struct xdr_stream *,
273 struct nfs_entry *, int);
274
275/* nfs3xdr.c */
276extern struct rpc_procinfo nfs3_procedures[];
277extern int nfs3_decode_dirent(struct xdr_stream *,
278 struct nfs_entry *, int);
279
280/* nfs4xdr.c */
281#if IS_ENABLED(CONFIG_NFS_V4)
282extern int nfs4_decode_dirent(struct xdr_stream *,
283 struct nfs_entry *, int);
284#endif
285#ifdef CONFIG_NFS_V4_1
286extern const u32 nfs41_maxread_overhead;
287extern const u32 nfs41_maxwrite_overhead;
288extern const u32 nfs41_maxgetdevinfo_overhead;
289#endif
290
291/* nfs4proc.c */
292#if IS_ENABLED(CONFIG_NFS_V4)
293extern struct rpc_procinfo nfs4_procedures[];
294#endif
295
296#ifdef CONFIG_NFS_V4_SECURITY_LABEL
297extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
298static inline struct nfs4_label *
299nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
300{
301 if (!dst || !src)
302 return NULL;
303
304 if (src->len > NFS4_MAXLABELLEN)
305 return NULL;
306
307 dst->lfs = src->lfs;
308 dst->pi = src->pi;
309 dst->len = src->len;
310 memcpy(dst->label, src->label, src->len);
311
312 return dst;
313}
314static inline void nfs4_label_free(struct nfs4_label *label)
315{
316 if (label) {
317 kfree(label->label);
318 kfree(label);
319 }
320 return;
321}
322
323static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
324{
325 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
326 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
327}
328#else
329static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
330static inline void nfs4_label_free(void *label) {}
331static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
332{
333}
334static inline struct nfs4_label *
335nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
336{
337 return NULL;
338}
339#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
340
341/* proc.c */
342void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
343extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
344 const struct nfs_client_initdata *);
345
346/* dir.c */
347extern void nfs_advise_use_readdirplus(struct inode *dir);
348extern void nfs_force_use_readdirplus(struct inode *dir);
349extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
350 struct shrink_control *sc);
351extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
352 struct shrink_control *sc);
353struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
354int nfs_create(struct inode *, struct dentry *, umode_t, bool);
355int nfs_mkdir(struct inode *, struct dentry *, umode_t);
356int nfs_rmdir(struct inode *, struct dentry *);
357int nfs_unlink(struct inode *, struct dentry *);
358int nfs_symlink(struct inode *, struct dentry *, const char *);
359int nfs_link(struct dentry *, struct inode *, struct dentry *);
360int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
361int nfs_rename(struct inode *, struct dentry *,
362 struct inode *, struct dentry *, unsigned int);
363
364/* file.c */
365int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
366loff_t nfs_file_llseek(struct file *, loff_t, int);
367ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
368int nfs_file_mmap(struct file *, struct vm_area_struct *);
369ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
370int nfs_file_release(struct inode *, struct file *);
371int nfs_lock(struct file *, int, struct file_lock *);
372int nfs_flock(struct file *, int, struct file_lock *);
373int nfs_check_flags(int);
374
375/* inode.c */
376extern struct workqueue_struct *nfsiod_workqueue;
377extern struct inode *nfs_alloc_inode(struct super_block *sb);
378extern void nfs_destroy_inode(struct inode *);
379extern int nfs_write_inode(struct inode *, struct writeback_control *);
380extern int nfs_drop_inode(struct inode *);
381extern void nfs_clear_inode(struct inode *);
382extern void nfs_evict_inode(struct inode *);
383void nfs_zap_acl_cache(struct inode *inode);
384extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
385extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
386extern int nfs_wait_atomic_killable(atomic_t *p);
387
388/* super.c */
389extern const struct super_operations nfs_sops;
390extern struct file_system_type nfs_fs_type;
391extern struct file_system_type nfs_xdev_fs_type;
392#if IS_ENABLED(CONFIG_NFS_V4)
393extern struct file_system_type nfs4_xdev_fs_type;
394extern struct file_system_type nfs4_referral_fs_type;
395#endif
396bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
397struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
398 struct nfs_subversion *);
399void nfs_initialise_sb(struct super_block *);
400int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
401int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
402struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
403 struct nfs_mount_info *, struct nfs_subversion *);
404struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
405struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
406 const char *, struct nfs_mount_info *);
407void nfs_kill_super(struct super_block *);
408void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
409
410extern struct rpc_stat nfs_rpcstat;
411
412extern int __init register_nfs_fs(void);
413extern void __exit unregister_nfs_fs(void);
414extern bool nfs_sb_active(struct super_block *sb);
415extern void nfs_sb_deactive(struct super_block *sb);
416
417/* io.c */
418extern void nfs_start_io_read(struct inode *inode);
419extern void nfs_end_io_read(struct inode *inode);
420extern void nfs_start_io_write(struct inode *inode);
421extern void nfs_end_io_write(struct inode *inode);
422extern void nfs_start_io_direct(struct inode *inode);
423extern void nfs_end_io_direct(struct inode *inode);
424
425static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
426{
427 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
428}
429
430/* namespace.c */
431#define NFS_PATH_CANONICAL 1
432extern char *nfs_path(char **p, struct dentry *dentry,
433 char *buffer, ssize_t buflen, unsigned flags);
434extern struct vfsmount *nfs_d_automount(struct path *path);
435struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
436 struct nfs_fh *, struct nfs_fattr *);
437struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
438 struct nfs_fattr *, rpc_authflavor_t);
439
440/* getroot.c */
441extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
442 const char *);
443#if IS_ENABLED(CONFIG_NFS_V4)
444extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
445 const char *);
446
447extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
448#endif
449
450struct nfs_pgio_completion_ops;
451/* read.c */
452extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
453 struct inode *inode, bool force_mds,
454 const struct nfs_pgio_completion_ops *compl_ops);
455extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
456extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
457
458/* super.c */
459void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
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_commit_file(struct file *file, struct nfs_write_verifier *verf);
497int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
498 int how, struct nfs_commit_info *cinfo);
499void nfs_retry_commit(struct list_head *page_list,
500 struct pnfs_layout_segment *lseg,
501 struct nfs_commit_info *cinfo,
502 u32 ds_commit_idx);
503void nfs_commitdata_release(struct nfs_commit_data *data);
504void nfs_request_add_commit_list(struct nfs_page *req,
505 struct nfs_commit_info *cinfo);
506void nfs_request_add_commit_list_locked(struct nfs_page *req,
507 struct list_head *dst,
508 struct nfs_commit_info *cinfo);
509void nfs_request_remove_commit_list(struct nfs_page *req,
510 struct nfs_commit_info *cinfo);
511void nfs_init_cinfo(struct nfs_commit_info *cinfo,
512 struct inode *inode,
513 struct nfs_direct_req *dreq);
514int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
515bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
516void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
517
518int nfs_filemap_write_and_wait_range(struct address_space *mapping,
519 loff_t lstart, loff_t lend);
520
521#ifdef CONFIG_NFS_V4_1
522static inline
523void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
524{
525 int i;
526
527 for (i = 0; i < cinfo->nbuckets; i++)
528 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
529}
530#else
531static inline
532void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
533{
534}
535#endif
536
537#ifdef CONFIG_MIGRATION
538extern int nfs_migrate_page(struct address_space *,
539 struct page *, struct page *, enum migrate_mode);
540#endif
541
542static inline int
543nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
544 const struct nfs_write_verifier *v2)
545{
546 return memcmp(v1->data, v2->data, sizeof(v1->data));
547}
548
549/* unlink.c */
550extern struct rpc_task *
551nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
552 struct dentry *old_dentry, struct dentry *new_dentry,
553 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
554extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
555
556/* direct.c */
557void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
558 struct nfs_direct_req *dreq);
559extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
560
561/* nfs4proc.c */
562extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
563 const struct nfs_client_initdata *);
564extern int nfs40_walk_client_list(struct nfs_client *clp,
565 struct nfs_client **result,
566 struct rpc_cred *cred);
567extern int nfs41_walk_client_list(struct nfs_client *clp,
568 struct nfs_client **result,
569 struct rpc_cred *cred);
570extern int nfs4_test_session_trunk(struct rpc_clnt *,
571 struct rpc_xprt *,
572 void *);
573
574static inline struct inode *nfs_igrab_and_active(struct inode *inode)
575{
576 inode = igrab(inode);
577 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
578 iput(inode);
579 inode = NULL;
580 }
581 return inode;
582}
583
584static inline void nfs_iput_and_deactive(struct inode *inode)
585{
586 if (inode != NULL) {
587 struct super_block *sb = inode->i_sb;
588
589 iput(inode);
590 nfs_sb_deactive(sb);
591 }
592}
593
594/*
595 * Determine the device name as a string
596 */
597static inline char *nfs_devname(struct dentry *dentry,
598 char *buffer, ssize_t buflen)
599{
600 char *dummy;
601 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
602}
603
604/*
605 * Determine the actual block size (and log2 thereof)
606 */
607static inline
608unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
609{
610 /* make sure blocksize is a power of two */
611 if ((bsize & (bsize - 1)) || nrbitsp) {
612 unsigned char nrbits;
613
614 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
615 ;
616 bsize = 1 << nrbits;
617 if (nrbitsp)
618 *nrbitsp = nrbits;
619 }
620
621 return bsize;
622}
623
624/*
625 * Calculate the number of 512byte blocks used.
626 */
627static inline blkcnt_t nfs_calc_block_size(u64 tsize)
628{
629 blkcnt_t used = (tsize + 511) >> 9;
630 return (used > ULONG_MAX) ? ULONG_MAX : used;
631}
632
633/*
634 * Compute and set NFS server blocksize
635 */
636static inline
637unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
638{
639 if (bsize < NFS_MIN_FILE_IO_SIZE)
640 bsize = NFS_DEF_FILE_IO_SIZE;
641 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
642 bsize = NFS_MAX_FILE_IO_SIZE;
643
644 return nfs_block_bits(bsize, nrbitsp);
645}
646
647/*
648 * Determine the maximum file size for a superblock
649 */
650static inline
651void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
652{
653 sb->s_maxbytes = (loff_t)maxfilesize;
654 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
655 sb->s_maxbytes = MAX_LFS_FILESIZE;
656}
657
658/*
659 * Record the page as unstable and mark its inode as dirty.
660 */
661static inline
662void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
663{
664 if (!cinfo->dreq) {
665 struct inode *inode = page_file_mapping(page)->host;
666
667 inc_node_page_state(page, NR_UNSTABLE_NFS);
668 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
669 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
670 }
671}
672
673/*
674 * Determine the number of bytes of data the page contains
675 */
676static inline
677unsigned int nfs_page_length(struct page *page)
678{
679 loff_t i_size = i_size_read(page_file_mapping(page)->host);
680
681 if (i_size > 0) {
682 pgoff_t index = page_index(page);
683 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
684 if (index < end_index)
685 return PAGE_SIZE;
686 if (index == end_index)
687 return ((i_size - 1) & ~PAGE_MASK) + 1;
688 }
689 return 0;
690}
691
692/*
693 * Convert a umode to a dirent->d_type
694 */
695static inline
696unsigned char nfs_umode_to_dtype(umode_t mode)
697{
698 return (mode >> 12) & 15;
699}
700
701/*
702 * Determine the number of pages in an array of length 'len' and
703 * with a base offset of 'base'
704 */
705static inline
706unsigned int nfs_page_array_len(unsigned int base, size_t len)
707{
708 return ((unsigned long)len + (unsigned long)base +
709 PAGE_SIZE - 1) >> PAGE_SHIFT;
710}
711
712/*
713 * Convert a struct timespec into a 64-bit change attribute
714 *
715 * This does approximately the same thing as timespec_to_ns(),
716 * but for calculation efficiency, we multiply the seconds by
717 * 1024*1024*1024.
718 */
719static inline
720u64 nfs_timespec_to_change_attr(const struct timespec *ts)
721{
722 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
723}
724
725#ifdef CONFIG_CRC32
726/**
727 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
728 * @fh - pointer to filehandle
729 *
730 * returns a crc32 hash for the filehandle that is compatible with
731 * the one displayed by "wireshark".
732 */
733static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
734{
735 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
736}
737static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
738{
739 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
740 NFS4_STATEID_OTHER_SIZE);
741}
742#else
743static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
744{
745 return 0;
746}
747static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
748{
749 return 0;
750}
751#endif
752
753static inline bool nfs_error_is_fatal(int err)
754{
755 switch (err) {
756 case -ERESTARTSYS:
757 case -EIO:
758 case -ENOSPC:
759 case -EROFS:
760 case -E2BIG:
761 return true;
762 default:
763 return false;
764 }
765}