Linux kernel mirror (for testing)
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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/fs_context.h>
8#include <linux/security.h>
9#include <linux/crc32.h>
10#include <linux/sunrpc/addr.h>
11#include <linux/nfs_page.h>
12#include <linux/wait_bit.h>
13
14#define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
15
16extern const struct export_operations nfs_export_ops;
17
18struct nfs_string;
19struct nfs_pageio_descriptor;
20
21static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
22{
23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
25}
26
27static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
28{
29 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
30 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
31 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
32 return 0;
33 return 1;
34}
35
36static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry)
37{
38 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL))
39 return false;
40 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size)
41 return false;
42 return true;
43}
44
45/*
46 * Note: RFC 1813 doesn't limit the number of auth flavors that
47 * a server can return, so make something up.
48 */
49#define NFS_MAX_SECFLAVORS (12)
50
51/*
52 * Value used if the user did not specify a port value.
53 */
54#define NFS_UNSPEC_PORT (-1)
55
56#define NFS_UNSPEC_RETRANS (UINT_MAX)
57#define NFS_UNSPEC_TIMEO (UINT_MAX)
58
59struct nfs_client_initdata {
60 unsigned long init_flags;
61 const char *hostname; /* Hostname of the server */
62 const struct sockaddr *addr; /* Address of the server */
63 const char *nodename; /* Hostname of the client */
64 const char *ip_addr; /* IP address of the client */
65 size_t addrlen;
66 struct nfs_subversion *nfs_mod;
67 int proto;
68 u32 minorversion;
69 unsigned int nconnect;
70 unsigned int max_connect;
71 struct net *net;
72 const struct rpc_timeout *timeparms;
73 const struct cred *cred;
74};
75
76/*
77 * In-kernel mount arguments
78 */
79struct nfs_fs_context {
80 bool internal;
81 bool skip_reconfig_option_check;
82 bool need_mount;
83 bool sloppy;
84 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
85 unsigned int rsize, wsize;
86 unsigned int timeo, retrans;
87 unsigned int acregmin, acregmax;
88 unsigned int acdirmin, acdirmax;
89 unsigned int namlen;
90 unsigned int options;
91 unsigned int bsize;
92 struct nfs_auth_info auth_info;
93 rpc_authflavor_t selected_flavor;
94 char *client_address;
95 unsigned int version;
96 unsigned int minorversion;
97 char *fscache_uniq;
98 unsigned short protofamily;
99 unsigned short mountfamily;
100 bool has_sec_mnt_opts;
101
102 struct {
103 union {
104 struct sockaddr address;
105 struct sockaddr_storage _address;
106 };
107 size_t addrlen;
108 char *hostname;
109 u32 version;
110 int port;
111 unsigned short protocol;
112 } mount_server;
113
114 struct {
115 union {
116 struct sockaddr address;
117 struct sockaddr_storage _address;
118 };
119 size_t addrlen;
120 char *hostname;
121 char *export_path;
122 int port;
123 unsigned short protocol;
124 unsigned short nconnect;
125 unsigned short max_connect;
126 unsigned short export_path_len;
127 } nfs_server;
128
129 struct nfs_fh *mntfh;
130 struct nfs_server *server;
131 struct nfs_subversion *nfs_mod;
132
133 /* Information for a cloned mount. */
134 struct nfs_clone_mount {
135 struct super_block *sb;
136 struct dentry *dentry;
137 struct nfs_fattr *fattr;
138 unsigned int inherited_bsize;
139 } clone_data;
140};
141
142#define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \
143 errorf(fc, fmt, ## __VA_ARGS__) : \
144 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
145
146#define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \
147 errorf(fc, fmt, ## __VA_ARGS__) : \
148 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
149
150#define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \
151 invalf(fc, fmt, ## __VA_ARGS__) : \
152 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; }))
153
154#define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \
155 invalf(fc, fmt, ## __VA_ARGS__) : \
156 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; }))
157
158#define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \
159 warnf(fc, fmt, ## __VA_ARGS__) : \
160 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
161
162#define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \
163 warnf(fc, fmt, ## __VA_ARGS__) : \
164 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
165
166static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
167{
168 return fc->fs_private;
169}
170
171/* mount_clnt.c */
172struct nfs_mount_request {
173 struct sockaddr *sap;
174 size_t salen;
175 char *hostname;
176 char *dirpath;
177 u32 version;
178 unsigned short protocol;
179 struct nfs_fh *fh;
180 int noresvport;
181 unsigned int *auth_flav_len;
182 rpc_authflavor_t *auth_flavs;
183 struct net *net;
184};
185
186extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans);
187extern void nfs_umount(const struct nfs_mount_request *info);
188
189/* client.c */
190extern const struct rpc_program nfs_program;
191extern void nfs_clients_init(struct net *net);
192extern void nfs_clients_exit(struct net *net);
193extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
194int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
195struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
196int nfs_probe_server(struct nfs_server *, struct nfs_fh *);
197void nfs_server_insert_lists(struct nfs_server *);
198void nfs_server_remove_lists(struct nfs_server *);
199void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
200int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
201 rpc_authflavor_t);
202struct nfs_server *nfs_alloc_server(void);
203void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
204
205extern void nfs_put_client(struct nfs_client *);
206extern void nfs_free_client(struct nfs_client *);
207extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
208extern struct nfs_client *
209nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
210 struct nfs4_sessionid *, u32);
211extern struct nfs_server *nfs_create_server(struct fs_context *);
212extern void nfs4_server_set_init_caps(struct nfs_server *);
213extern struct nfs_server *nfs4_create_server(struct fs_context *);
214extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
215extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
216 struct sockaddr *sap, size_t salen,
217 struct net *net);
218extern void nfs_free_server(struct nfs_server *server);
219extern struct nfs_server *nfs_clone_server(struct nfs_server *,
220 struct nfs_fh *,
221 struct nfs_fattr *,
222 rpc_authflavor_t);
223extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
224extern int nfs_client_init_status(const struct nfs_client *clp);
225extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
226extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
227extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
228 const struct sockaddr *ds_addr,
229 int ds_addrlen, int ds_proto,
230 unsigned int ds_timeo,
231 unsigned int ds_retrans,
232 u32 minor_version);
233extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
234 struct inode *);
235extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
236 const struct sockaddr *ds_addr, int ds_addrlen,
237 int ds_proto, unsigned int ds_timeo,
238 unsigned int ds_retrans);
239#ifdef CONFIG_PROC_FS
240extern int __init nfs_fs_proc_init(void);
241extern void nfs_fs_proc_exit(void);
242extern int nfs_fs_proc_net_init(struct net *net);
243extern void nfs_fs_proc_net_exit(struct net *net);
244#else
245static inline int nfs_fs_proc_net_init(struct net *net)
246{
247 return 0;
248}
249static inline void nfs_fs_proc_net_exit(struct net *net)
250{
251}
252static inline int nfs_fs_proc_init(void)
253{
254 return 0;
255}
256static inline void nfs_fs_proc_exit(void)
257{
258}
259#endif
260
261/* callback_xdr.c */
262extern const struct svc_version nfs4_callback_version1;
263extern const struct svc_version nfs4_callback_version4;
264
265/* fs_context.c */
266extern struct file_system_type nfs_fs_type;
267
268/* pagelist.c */
269extern int __init nfs_init_nfspagecache(void);
270extern void nfs_destroy_nfspagecache(void);
271extern int __init nfs_init_readpagecache(void);
272extern void nfs_destroy_readpagecache(void);
273extern int __init nfs_init_writepagecache(void);
274extern void nfs_destroy_writepagecache(void);
275
276extern int __init nfs_init_directcache(void);
277extern void nfs_destroy_directcache(void);
278extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
279 struct nfs_pgio_header *hdr,
280 void (*release)(struct nfs_pgio_header *hdr));
281void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
282int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
283
284extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
285struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
286void nfs_pgio_header_free(struct nfs_pgio_header *);
287int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
288int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
289 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
290 const struct rpc_call_ops *call_ops, int how, int flags);
291void nfs_free_request(struct nfs_page *req);
292struct nfs_pgio_mirror *
293nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
294
295static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
296 const struct nfs_open_context *ctx2)
297{
298 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
299}
300
301/* nfs2xdr.c */
302extern const struct rpc_procinfo nfs_procedures[];
303extern int nfs2_decode_dirent(struct xdr_stream *,
304 struct nfs_entry *, bool);
305
306/* nfs3xdr.c */
307extern const struct rpc_procinfo nfs3_procedures[];
308extern int nfs3_decode_dirent(struct xdr_stream *,
309 struct nfs_entry *, bool);
310
311/* nfs4xdr.c */
312#if IS_ENABLED(CONFIG_NFS_V4)
313extern int nfs4_decode_dirent(struct xdr_stream *,
314 struct nfs_entry *, bool);
315#endif
316#ifdef CONFIG_NFS_V4_1
317extern const u32 nfs41_maxread_overhead;
318extern const u32 nfs41_maxwrite_overhead;
319extern const u32 nfs41_maxgetdevinfo_overhead;
320#endif
321
322/* nfs4proc.c */
323#if IS_ENABLED(CONFIG_NFS_V4)
324extern const struct rpc_procinfo nfs4_procedures[];
325#endif
326
327#ifdef CONFIG_NFS_V4_SECURITY_LABEL
328extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
329static inline struct nfs4_label *
330nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
331{
332 if (!dst || !src)
333 return NULL;
334
335 if (src->len > NFS4_MAXLABELLEN)
336 return NULL;
337
338 dst->lfs = src->lfs;
339 dst->pi = src->pi;
340 dst->len = src->len;
341 memcpy(dst->label, src->label, src->len);
342
343 return dst;
344}
345
346static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
347{
348 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
349 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
350}
351#else
352static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
353static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
354{
355}
356static inline struct nfs4_label *
357nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
358{
359 return NULL;
360}
361#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
362
363/* proc.c */
364void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
365extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
366 const struct nfs_client_initdata *);
367
368/* dir.c */
369extern void nfs_advise_use_readdirplus(struct inode *dir);
370extern void nfs_force_use_readdirplus(struct inode *dir);
371extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
372 struct shrink_control *sc);
373extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
374 struct shrink_control *sc);
375struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
376int nfs_create(struct user_namespace *, struct inode *, struct dentry *,
377 umode_t, bool);
378int nfs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
379 umode_t);
380int nfs_rmdir(struct inode *, struct dentry *);
381int nfs_unlink(struct inode *, struct dentry *);
382int nfs_symlink(struct user_namespace *, struct inode *, struct dentry *,
383 const char *);
384int nfs_link(struct dentry *, struct inode *, struct dentry *);
385int nfs_mknod(struct user_namespace *, struct inode *, struct dentry *, umode_t,
386 dev_t);
387int nfs_rename(struct user_namespace *, struct inode *, struct dentry *,
388 struct inode *, struct dentry *, unsigned int);
389
390/* file.c */
391int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
392loff_t nfs_file_llseek(struct file *, loff_t, int);
393ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
394int nfs_file_mmap(struct file *, struct vm_area_struct *);
395ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
396int nfs_file_release(struct inode *, struct file *);
397int nfs_lock(struct file *, int, struct file_lock *);
398int nfs_flock(struct file *, int, struct file_lock *);
399int nfs_check_flags(int);
400
401/* inode.c */
402extern struct workqueue_struct *nfsiod_workqueue;
403extern struct inode *nfs_alloc_inode(struct super_block *sb);
404extern void nfs_free_inode(struct inode *);
405extern int nfs_write_inode(struct inode *, struct writeback_control *);
406extern int nfs_drop_inode(struct inode *);
407extern void nfs_clear_inode(struct inode *);
408extern void nfs_evict_inode(struct inode *);
409extern void nfs_zap_acl_cache(struct inode *inode);
410extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags);
411extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
412extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
413extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
414
415/* super.c */
416extern const struct super_operations nfs_sops;
417bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
418int nfs_try_get_tree(struct fs_context *);
419int nfs_get_tree_common(struct fs_context *);
420void nfs_kill_super(struct super_block *);
421
422extern struct rpc_stat nfs_rpcstat;
423
424extern int __init register_nfs_fs(void);
425extern void __exit unregister_nfs_fs(void);
426extern bool nfs_sb_active(struct super_block *sb);
427extern void nfs_sb_deactive(struct super_block *sb);
428extern int nfs_client_for_each_server(struct nfs_client *clp,
429 int (*fn)(struct nfs_server *, void *),
430 void *data);
431/* io.c */
432extern void nfs_start_io_read(struct inode *inode);
433extern void nfs_end_io_read(struct inode *inode);
434extern void nfs_start_io_write(struct inode *inode);
435extern void nfs_end_io_write(struct inode *inode);
436extern void nfs_start_io_direct(struct inode *inode);
437extern void nfs_end_io_direct(struct inode *inode);
438
439static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
440{
441 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
442}
443
444/* namespace.c */
445#define NFS_PATH_CANONICAL 1
446extern char *nfs_path(char **p, struct dentry *dentry,
447 char *buffer, ssize_t buflen, unsigned flags);
448extern struct vfsmount *nfs_d_automount(struct path *path);
449int nfs_submount(struct fs_context *, struct nfs_server *);
450int nfs_do_submount(struct fs_context *);
451
452/* getroot.c */
453extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
454#if IS_ENABLED(CONFIG_NFS_V4)
455extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
456#endif
457
458struct nfs_pgio_completion_ops;
459/* read.c */
460extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
461 struct inode *inode, bool force_mds,
462 const struct nfs_pgio_completion_ops *compl_ops);
463extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
464extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
465
466/* super.c */
467void nfs_umount_begin(struct super_block *);
468int nfs_statfs(struct dentry *, struct kstatfs *);
469int nfs_show_options(struct seq_file *, struct dentry *);
470int nfs_show_devname(struct seq_file *, struct dentry *);
471int nfs_show_path(struct seq_file *, struct dentry *);
472int nfs_show_stats(struct seq_file *, struct dentry *);
473int nfs_reconfigure(struct fs_context *);
474
475/* write.c */
476extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
477 struct inode *inode, int ioflags, bool force_mds,
478 const struct nfs_pgio_completion_ops *compl_ops);
479extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
480extern void nfs_commit_free(struct nfs_commit_data *p);
481extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
482extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
483extern int nfs_initiate_commit(struct rpc_clnt *clnt,
484 struct nfs_commit_data *data,
485 const struct nfs_rpc_ops *nfs_ops,
486 const struct rpc_call_ops *call_ops,
487 int how, int flags);
488extern void nfs_init_commit(struct nfs_commit_data *data,
489 struct list_head *head,
490 struct pnfs_layout_segment *lseg,
491 struct nfs_commit_info *cinfo);
492int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
493 struct nfs_commit_info *cinfo, int max);
494unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
495int nfs_scan_commit(struct inode *inode, struct list_head *dst,
496 struct nfs_commit_info *cinfo);
497void nfs_mark_request_commit(struct nfs_page *req,
498 struct pnfs_layout_segment *lseg,
499 struct nfs_commit_info *cinfo,
500 u32 ds_commit_idx);
501int nfs_write_need_commit(struct nfs_pgio_header *);
502void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
503int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
504 int how, struct nfs_commit_info *cinfo);
505void nfs_retry_commit(struct list_head *page_list,
506 struct pnfs_layout_segment *lseg,
507 struct nfs_commit_info *cinfo,
508 u32 ds_commit_idx);
509void nfs_commitdata_release(struct nfs_commit_data *data);
510void nfs_request_add_commit_list(struct nfs_page *req,
511 struct nfs_commit_info *cinfo);
512void nfs_request_add_commit_list_locked(struct nfs_page *req,
513 struct list_head *dst,
514 struct nfs_commit_info *cinfo);
515void nfs_request_remove_commit_list(struct nfs_page *req,
516 struct nfs_commit_info *cinfo);
517void nfs_init_cinfo(struct nfs_commit_info *cinfo,
518 struct inode *inode,
519 struct nfs_direct_req *dreq);
520int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
521bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
522void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
523
524int nfs_filemap_write_and_wait_range(struct address_space *mapping,
525 loff_t lstart, loff_t lend);
526
527#ifdef CONFIG_NFS_V4_1
528static inline void
529pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
530 unsigned int nbuckets)
531{
532 unsigned int i;
533
534 for (i = 0; i < nbuckets; i++)
535 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
536}
537static inline
538void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
539{
540 struct pnfs_commit_array *array;
541
542 rcu_read_lock();
543 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
544 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
545 array->nbuckets);
546 rcu_read_unlock();
547}
548#else
549static inline
550void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
551{
552}
553#endif
554
555#ifdef CONFIG_MIGRATION
556extern int nfs_migrate_page(struct address_space *,
557 struct page *, struct page *, enum migrate_mode);
558#endif
559
560static inline int
561nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
562 const struct nfs_write_verifier *v2)
563{
564 return memcmp(v1->data, v2->data, sizeof(v1->data));
565}
566
567static inline bool
568nfs_write_match_verf(const struct nfs_writeverf *verf,
569 struct nfs_page *req)
570{
571 return verf->committed > NFS_UNSTABLE &&
572 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
573}
574
575/* unlink.c */
576extern struct rpc_task *
577nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
578 struct dentry *old_dentry, struct dentry *new_dentry,
579 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
580extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
581
582/* direct.c */
583void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
584 struct nfs_direct_req *dreq);
585extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
586
587/* nfs4proc.c */
588extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
589 const struct nfs_client_initdata *);
590extern int nfs40_walk_client_list(struct nfs_client *clp,
591 struct nfs_client **result,
592 const struct cred *cred);
593extern int nfs41_walk_client_list(struct nfs_client *clp,
594 struct nfs_client **result,
595 const struct cred *cred);
596extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
597 struct rpc_xprt *xprt,
598 void *data);
599
600static inline struct inode *nfs_igrab_and_active(struct inode *inode)
601{
602 struct super_block *sb = inode->i_sb;
603
604 if (sb && nfs_sb_active(sb)) {
605 if (igrab(inode))
606 return inode;
607 nfs_sb_deactive(sb);
608 }
609 return NULL;
610}
611
612static inline void nfs_iput_and_deactive(struct inode *inode)
613{
614 if (inode != NULL) {
615 struct super_block *sb = inode->i_sb;
616
617 iput(inode);
618 nfs_sb_deactive(sb);
619 }
620}
621
622/*
623 * Determine the device name as a string
624 */
625static inline char *nfs_devname(struct dentry *dentry,
626 char *buffer, ssize_t buflen)
627{
628 char *dummy;
629 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
630}
631
632/*
633 * Determine the actual block size (and log2 thereof)
634 */
635static inline
636unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
637{
638 /* make sure blocksize is a power of two */
639 if ((bsize & (bsize - 1)) || nrbitsp) {
640 unsigned char nrbits;
641
642 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
643 ;
644 bsize = 1 << nrbits;
645 if (nrbitsp)
646 *nrbitsp = nrbits;
647 }
648
649 return bsize;
650}
651
652/*
653 * Calculate the number of 512byte blocks used.
654 */
655static inline blkcnt_t nfs_calc_block_size(u64 tsize)
656{
657 blkcnt_t used = (tsize + 511) >> 9;
658 return (used > ULONG_MAX) ? ULONG_MAX : used;
659}
660
661/*
662 * Compute and set NFS server blocksize
663 */
664static inline
665unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
666{
667 if (bsize < NFS_MIN_FILE_IO_SIZE)
668 bsize = NFS_DEF_FILE_IO_SIZE;
669 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
670 bsize = NFS_MAX_FILE_IO_SIZE;
671
672 return nfs_block_bits(bsize, nrbitsp);
673}
674
675/*
676 * Determine the maximum file size for a superblock
677 */
678static inline
679void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
680{
681 sb->s_maxbytes = (loff_t)maxfilesize;
682 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
683 sb->s_maxbytes = MAX_LFS_FILESIZE;
684}
685
686/*
687 * Record the page as unstable (an extra writeback period) and mark its
688 * inode as dirty.
689 */
690static inline
691void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
692{
693 if (!cinfo->dreq) {
694 struct inode *inode = page_file_mapping(page)->host;
695
696 /* This page is really still in write-back - just that the
697 * writeback is happening on the server now.
698 */
699 inc_node_page_state(page, NR_WRITEBACK);
700 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
701 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
702 }
703}
704
705/*
706 * Determine the number of bytes of data the page contains
707 */
708static inline
709unsigned int nfs_page_length(struct page *page)
710{
711 loff_t i_size = i_size_read(page_file_mapping(page)->host);
712
713 if (i_size > 0) {
714 pgoff_t index = page_index(page);
715 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
716 if (index < end_index)
717 return PAGE_SIZE;
718 if (index == end_index)
719 return ((i_size - 1) & ~PAGE_MASK) + 1;
720 }
721 return 0;
722}
723
724/*
725 * Convert a umode to a dirent->d_type
726 */
727static inline
728unsigned char nfs_umode_to_dtype(umode_t mode)
729{
730 return (mode >> 12) & 15;
731}
732
733/*
734 * Determine the number of pages in an array of length 'len' and
735 * with a base offset of 'base'
736 */
737static inline
738unsigned int nfs_page_array_len(unsigned int base, size_t len)
739{
740 return ((unsigned long)len + (unsigned long)base +
741 PAGE_SIZE - 1) >> PAGE_SHIFT;
742}
743
744/*
745 * Convert a struct timespec64 into a 64-bit change attribute
746 *
747 * This does approximately the same thing as timespec64_to_ns(),
748 * but for calculation efficiency, we multiply the seconds by
749 * 1024*1024*1024.
750 */
751static inline
752u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
753{
754 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
755}
756
757#ifdef CONFIG_CRC32
758/**
759 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
760 * @fh - pointer to filehandle
761 *
762 * returns a crc32 hash for the filehandle that is compatible with
763 * the one displayed by "wireshark".
764 */
765static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
766{
767 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
768}
769static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
770{
771 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
772 NFS4_STATEID_OTHER_SIZE);
773}
774#else
775static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
776{
777 return 0;
778}
779static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
780{
781 return 0;
782}
783#endif
784
785static inline bool nfs_error_is_fatal(int err)
786{
787 switch (err) {
788 case -ERESTARTSYS:
789 case -EINTR:
790 case -EACCES:
791 case -EDQUOT:
792 case -EFBIG:
793 case -EIO:
794 case -ENOSPC:
795 case -EROFS:
796 case -ESTALE:
797 case -E2BIG:
798 case -ENOMEM:
799 case -ETIMEDOUT:
800 return true;
801 default:
802 return false;
803 }
804}
805
806static inline bool nfs_error_is_fatal_on_server(int err)
807{
808 switch (err) {
809 case 0:
810 case -ERESTARTSYS:
811 case -EINTR:
812 return false;
813 }
814 return nfs_error_is_fatal(err);
815}
816
817/*
818 * Select between a default port value and a user-specified port value.
819 * If a zero value is set, then autobind will be used.
820 */
821static inline void nfs_set_port(struct sockaddr *sap, int *port,
822 const unsigned short default_port)
823{
824 if (*port == NFS_UNSPEC_PORT)
825 *port = default_port;
826
827 rpc_set_port(sap, *port);
828}