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nfs4: clnt: respect noresvport when establishing connections to DSes
[deliverable/linux.git] / fs / nfs / internal.h
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CommitLineData
1/*
2 * NFS internal definitions
3 */
4
5#include "nfs4_fs.h"
6#include <linux/mount.h>
7#include <linux/security.h>
8#include <linux/crc32.h>
9#include <linux/nfs_page.h>
10
11#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
12
13struct nfs_string;
14
15/* Maximum number of readahead requests
16 * FIXME: this should really be a sysctl so that users may tune it to suit
17 * their needs. People that do NFS over a slow network, might for
18 * instance want to reduce it to something closer to 1 for improved
19 * interactive response.
20 */
21#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
22
23static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
24{
25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
27}
28
29static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
30{
31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
34 return 0;
35 return 1;
36}
37
38struct nfs_clone_mount {
39 const struct super_block *sb;
40 const struct dentry *dentry;
41 struct nfs_fh *fh;
42 struct nfs_fattr *fattr;
43 char *hostname;
44 char *mnt_path;
45 struct sockaddr *addr;
46 size_t addrlen;
47 rpc_authflavor_t authflavor;
48};
49
50/*
51 * Note: RFC 1813 doesn't limit the number of auth flavors that
52 * a server can return, so make something up.
53 */
54#define NFS_MAX_SECFLAVORS (12)
55
56/*
57 * Value used if the user did not specify a port value.
58 */
59#define NFS_UNSPEC_PORT (-1)
60
61/*
62 * Maximum number of pages that readdir can use for creating
63 * a vmapped array of pages.
64 */
65#define NFS_MAX_READDIR_PAGES 8
66
67struct nfs_client_initdata {
68 unsigned long init_flags;
69 const char *hostname; /* Hostname of the server */
70 const struct sockaddr *addr; /* Address of the server */
71 const char *nodename; /* Hostname of the client */
72 const char *ip_addr; /* IP address of the client */
73 size_t addrlen;
74 struct nfs_subversion *nfs_mod;
75 int proto;
76 u32 minorversion;
77 struct net *net;
78 const struct rpc_timeout *timeparms;
79};
80
81/*
82 * In-kernel mount arguments
83 */
84struct nfs_parsed_mount_data {
85 int flags;
86 unsigned int rsize, wsize;
87 unsigned int timeo, retrans;
88 unsigned int acregmin, acregmax,
89 acdirmin, acdirmax;
90 unsigned int namlen;
91 unsigned int options;
92 unsigned int bsize;
93 struct nfs_auth_info auth_info;
94 rpc_authflavor_t selected_flavor;
95 char *client_address;
96 unsigned int version;
97 unsigned int minorversion;
98 char *fscache_uniq;
99 bool need_mount;
100
101 struct {
102 struct sockaddr_storage address;
103 size_t addrlen;
104 char *hostname;
105 u32 version;
106 int port;
107 unsigned short protocol;
108 } mount_server;
109
110 struct {
111 struct sockaddr_storage address;
112 size_t addrlen;
113 char *hostname;
114 char *export_path;
115 int port;
116 unsigned short protocol;
117 } nfs_server;
118
119 struct security_mnt_opts lsm_opts;
120 struct net *net;
121};
122
123/* mount_clnt.c */
124struct nfs_mount_request {
125 struct sockaddr *sap;
126 size_t salen;
127 char *hostname;
128 char *dirpath;
129 u32 version;
130 unsigned short protocol;
131 struct nfs_fh *fh;
132 int noresvport;
133 unsigned int *auth_flav_len;
134 rpc_authflavor_t *auth_flavs;
135 struct net *net;
136};
137
138struct nfs_mount_info {
139 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
140 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
141 struct nfs_parsed_mount_data *parsed;
142 struct nfs_clone_mount *cloned;
143 struct nfs_fh *mntfh;
144};
145
146extern int nfs_mount(struct nfs_mount_request *info);
147extern void nfs_umount(const struct nfs_mount_request *info);
148
149/* client.c */
150extern const struct rpc_program nfs_program;
151extern void nfs_clients_init(struct net *net);
152extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
153int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
154struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
155 rpc_authflavor_t);
156int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
157void nfs_server_insert_lists(struct nfs_server *);
158void nfs_server_remove_lists(struct nfs_server *);
159void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
160int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
161 rpc_authflavor_t);
162struct nfs_server *nfs_alloc_server(void);
163void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
164
165extern void nfs_cleanup_cb_ident_idr(struct net *);
166extern void nfs_put_client(struct nfs_client *);
167extern void nfs_free_client(struct nfs_client *);
168extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
169extern struct nfs_client *
170nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
171 struct nfs4_sessionid *, u32);
172extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
173 struct nfs_subversion *);
174extern struct nfs_server *nfs4_create_server(
175 struct nfs_mount_info *,
176 struct nfs_subversion *);
177extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
178 struct nfs_fh *);
179extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
180 struct sockaddr *sap, size_t salen,
181 struct net *net);
182extern void nfs_free_server(struct nfs_server *server);
183extern struct nfs_server *nfs_clone_server(struct nfs_server *,
184 struct nfs_fh *,
185 struct nfs_fattr *,
186 rpc_authflavor_t);
187extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
188extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
189extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
190 const struct sockaddr *ds_addr,
191 int ds_addrlen, int ds_proto,
192 unsigned int ds_timeo,
193 unsigned int ds_retrans,
194 u32 minor_version,
195 rpc_authflavor_t au_flavor);
196extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
197 struct inode *);
198extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
199 const struct sockaddr *ds_addr, int ds_addrlen,
200 int ds_proto, unsigned int ds_timeo,
201 unsigned int ds_retrans, rpc_authflavor_t au_flavor);
202#ifdef CONFIG_PROC_FS
203extern int __init nfs_fs_proc_init(void);
204extern void nfs_fs_proc_exit(void);
205extern int nfs_fs_proc_net_init(struct net *net);
206extern void nfs_fs_proc_net_exit(struct net *net);
207#else
208static inline int nfs_fs_proc_net_init(struct net *net)
209{
210 return 0;
211}
212static inline void nfs_fs_proc_net_exit(struct net *net)
213{
214}
215static inline int nfs_fs_proc_init(void)
216{
217 return 0;
218}
219static inline void nfs_fs_proc_exit(void)
220{
221}
222#endif
223
224/* callback_xdr.c */
225extern struct svc_version nfs4_callback_version1;
226extern struct svc_version nfs4_callback_version4;
227
228struct nfs_pageio_descriptor;
229/* pagelist.c */
230extern int __init nfs_init_nfspagecache(void);
231extern void nfs_destroy_nfspagecache(void);
232extern int __init nfs_init_readpagecache(void);
233extern void nfs_destroy_readpagecache(void);
234extern int __init nfs_init_writepagecache(void);
235extern void nfs_destroy_writepagecache(void);
236
237extern int __init nfs_init_directcache(void);
238extern void nfs_destroy_directcache(void);
239extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
240 struct nfs_pgio_header *hdr,
241 void (*release)(struct nfs_pgio_header *hdr));
242void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
243int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
244
245extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
246struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
247void nfs_pgio_header_free(struct nfs_pgio_header *);
248void nfs_pgio_data_destroy(struct nfs_pgio_header *);
249int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
250int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
251 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
252 const struct rpc_call_ops *call_ops, int how, int flags);
253void nfs_free_request(struct nfs_page *req);
254struct nfs_pgio_mirror *
255nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
256
257static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
258{
259 WARN_ON_ONCE(desc->pg_mirror_count < 1);
260 return desc->pg_mirror_count > 1;
261}
262
263static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
264 const struct nfs_open_context *ctx2)
265{
266 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
267}
268
269/* nfs2xdr.c */
270extern struct rpc_procinfo nfs_procedures[];
271extern int nfs2_decode_dirent(struct xdr_stream *,
272 struct nfs_entry *, int);
273
274/* nfs3xdr.c */
275extern struct rpc_procinfo nfs3_procedures[];
276extern int nfs3_decode_dirent(struct xdr_stream *,
277 struct nfs_entry *, int);
278
279/* nfs4xdr.c */
280#if IS_ENABLED(CONFIG_NFS_V4)
281extern int nfs4_decode_dirent(struct xdr_stream *,
282 struct nfs_entry *, int);
283#endif
284#ifdef CONFIG_NFS_V4_1
285extern const u32 nfs41_maxread_overhead;
286extern const u32 nfs41_maxwrite_overhead;
287extern const u32 nfs41_maxgetdevinfo_overhead;
288#endif
289
290/* nfs4proc.c */
291#if IS_ENABLED(CONFIG_NFS_V4)
292extern struct rpc_procinfo nfs4_procedures[];
293#endif
294
295#ifdef CONFIG_NFS_V4_SECURITY_LABEL
296extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
297static inline struct nfs4_label *
298nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
299{
300 if (!dst || !src)
301 return NULL;
302
303 if (src->len > NFS4_MAXLABELLEN)
304 return NULL;
305
306 dst->lfs = src->lfs;
307 dst->pi = src->pi;
308 dst->len = src->len;
309 memcpy(dst->label, src->label, src->len);
310
311 return dst;
312}
313static inline void nfs4_label_free(struct nfs4_label *label)
314{
315 if (label) {
316 kfree(label->label);
317 kfree(label);
318 }
319 return;
320}
321
322static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
323{
324 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
325 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
326}
327#else
328static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
329static inline void nfs4_label_free(void *label) {}
330static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
331{
332}
333static inline struct nfs4_label *
334nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
335{
336 return NULL;
337}
338#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
339
340/* proc.c */
341void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
342extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
343 const struct nfs_client_initdata *);
344
345/* dir.c */
346extern void nfs_force_use_readdirplus(struct inode *dir);
347extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
348 struct shrink_control *sc);
349extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
350 struct shrink_control *sc);
351struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
352int nfs_create(struct inode *, struct dentry *, umode_t, bool);
353int nfs_mkdir(struct inode *, struct dentry *, umode_t);
354int nfs_rmdir(struct inode *, struct dentry *);
355int nfs_unlink(struct inode *, struct dentry *);
356int nfs_symlink(struct inode *, struct dentry *, const char *);
357int nfs_link(struct dentry *, struct inode *, struct dentry *);
358int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
359int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
360
361/* file.c */
362int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
363loff_t nfs_file_llseek(struct file *, loff_t, int);
364ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
365ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
366 size_t, unsigned int);
367int nfs_file_mmap(struct file *, struct vm_area_struct *);
368ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
369int nfs_file_release(struct inode *, struct file *);
370int nfs_lock(struct file *, int, struct file_lock *);
371int nfs_flock(struct file *, int, struct file_lock *);
372int nfs_check_flags(int);
373
374/* inode.c */
375extern struct workqueue_struct *nfsiod_workqueue;
376extern struct inode *nfs_alloc_inode(struct super_block *sb);
377extern void nfs_destroy_inode(struct inode *);
378extern int nfs_write_inode(struct inode *, struct writeback_control *);
379extern int nfs_drop_inode(struct inode *);
380extern void nfs_clear_inode(struct inode *);
381extern void nfs_evict_inode(struct inode *);
382void nfs_zap_acl_cache(struct inode *inode);
383extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
384extern int nfs_wait_atomic_killable(atomic_t *p);
385
386/* super.c */
387extern const struct super_operations nfs_sops;
388extern struct file_system_type nfs_fs_type;
389extern struct file_system_type nfs_xdev_fs_type;
390#if IS_ENABLED(CONFIG_NFS_V4)
391extern struct file_system_type nfs4_xdev_fs_type;
392extern struct file_system_type nfs4_referral_fs_type;
393#endif
394bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
395struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
396 struct nfs_subversion *);
397void nfs_initialise_sb(struct super_block *);
398int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
399int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
400struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
401 struct nfs_mount_info *, struct nfs_subversion *);
402struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
403struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
404 const char *, struct nfs_mount_info *);
405void nfs_kill_super(struct super_block *);
406void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
407
408extern struct rpc_stat nfs_rpcstat;
409
410extern int __init register_nfs_fs(void);
411extern void __exit unregister_nfs_fs(void);
412extern bool nfs_sb_active(struct super_block *sb);
413extern void nfs_sb_deactive(struct super_block *sb);
414
415/* namespace.c */
416#define NFS_PATH_CANONICAL 1
417extern char *nfs_path(char **p, struct dentry *dentry,
418 char *buffer, ssize_t buflen, unsigned flags);
419extern struct vfsmount *nfs_d_automount(struct path *path);
420struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
421 struct nfs_fh *, struct nfs_fattr *);
422struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
423 struct nfs_fattr *, rpc_authflavor_t);
424
425/* getroot.c */
426extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
427 const char *);
428#if IS_ENABLED(CONFIG_NFS_V4)
429extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
430 const char *);
431
432extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
433#endif
434
435struct nfs_pgio_completion_ops;
436/* read.c */
437extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
438 struct inode *inode, bool force_mds,
439 const struct nfs_pgio_completion_ops *compl_ops);
440extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
441extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
442
443/* super.c */
444void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
445void nfs_umount_begin(struct super_block *);
446int nfs_statfs(struct dentry *, struct kstatfs *);
447int nfs_show_options(struct seq_file *, struct dentry *);
448int nfs_show_devname(struct seq_file *, struct dentry *);
449int nfs_show_path(struct seq_file *, struct dentry *);
450int nfs_show_stats(struct seq_file *, struct dentry *);
451int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
452
453/* write.c */
454extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
455 struct inode *inode, int ioflags, bool force_mds,
456 const struct nfs_pgio_completion_ops *compl_ops);
457extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
458extern void nfs_commit_free(struct nfs_commit_data *p);
459extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
460extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
461extern int nfs_initiate_commit(struct rpc_clnt *clnt,
462 struct nfs_commit_data *data,
463 const struct nfs_rpc_ops *nfs_ops,
464 const struct rpc_call_ops *call_ops,
465 int how, int flags);
466extern void nfs_init_commit(struct nfs_commit_data *data,
467 struct list_head *head,
468 struct pnfs_layout_segment *lseg,
469 struct nfs_commit_info *cinfo);
470int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
471 struct nfs_commit_info *cinfo, int max);
472unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
473int nfs_scan_commit(struct inode *inode, struct list_head *dst,
474 struct nfs_commit_info *cinfo);
475void nfs_mark_request_commit(struct nfs_page *req,
476 struct pnfs_layout_segment *lseg,
477 struct nfs_commit_info *cinfo,
478 u32 ds_commit_idx);
479int nfs_write_need_commit(struct nfs_pgio_header *);
480void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
481int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
482int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
483 int how, struct nfs_commit_info *cinfo);
484void nfs_retry_commit(struct list_head *page_list,
485 struct pnfs_layout_segment *lseg,
486 struct nfs_commit_info *cinfo,
487 u32 ds_commit_idx);
488void nfs_commitdata_release(struct nfs_commit_data *data);
489void nfs_request_add_commit_list(struct nfs_page *req,
490 struct nfs_commit_info *cinfo);
491void nfs_request_add_commit_list_locked(struct nfs_page *req,
492 struct list_head *dst,
493 struct nfs_commit_info *cinfo);
494void nfs_request_remove_commit_list(struct nfs_page *req,
495 struct nfs_commit_info *cinfo);
496void nfs_init_cinfo(struct nfs_commit_info *cinfo,
497 struct inode *inode,
498 struct nfs_direct_req *dreq);
499int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
500bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
501void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
502
503#ifdef CONFIG_MIGRATION
504extern int nfs_migrate_page(struct address_space *,
505 struct page *, struct page *, enum migrate_mode);
506#else
507#define nfs_migrate_page NULL
508#endif
509
510/* unlink.c */
511extern struct rpc_task *
512nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
513 struct dentry *old_dentry, struct dentry *new_dentry,
514 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
515extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
516
517/* direct.c */
518void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
519 struct nfs_direct_req *dreq);
520extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
521
522/* nfs4proc.c */
523extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
524extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
525 const struct nfs_client_initdata *);
526extern int nfs40_walk_client_list(struct nfs_client *clp,
527 struct nfs_client **result,
528 struct rpc_cred *cred);
529extern int nfs41_walk_client_list(struct nfs_client *clp,
530 struct nfs_client **result,
531 struct rpc_cred *cred);
532
533static inline struct inode *nfs_igrab_and_active(struct inode *inode)
534{
535 inode = igrab(inode);
536 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
537 iput(inode);
538 inode = NULL;
539 }
540 return inode;
541}
542
543static inline void nfs_iput_and_deactive(struct inode *inode)
544{
545 if (inode != NULL) {
546 struct super_block *sb = inode->i_sb;
547
548 iput(inode);
549 nfs_sb_deactive(sb);
550 }
551}
552
553/*
554 * Determine the device name as a string
555 */
556static inline char *nfs_devname(struct dentry *dentry,
557 char *buffer, ssize_t buflen)
558{
559 char *dummy;
560 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
561}
562
563/*
564 * Determine the actual block size (and log2 thereof)
565 */
566static inline
567unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
568{
569 /* make sure blocksize is a power of two */
570 if ((bsize & (bsize - 1)) || nrbitsp) {
571 unsigned char nrbits;
572
573 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
574 ;
575 bsize = 1 << nrbits;
576 if (nrbitsp)
577 *nrbitsp = nrbits;
578 }
579
580 return bsize;
581}
582
583/*
584 * Calculate the number of 512byte blocks used.
585 */
586static inline blkcnt_t nfs_calc_block_size(u64 tsize)
587{
588 blkcnt_t used = (tsize + 511) >> 9;
589 return (used > ULONG_MAX) ? ULONG_MAX : used;
590}
591
592/*
593 * Compute and set NFS server blocksize
594 */
595static inline
596unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
597{
598 if (bsize < NFS_MIN_FILE_IO_SIZE)
599 bsize = NFS_DEF_FILE_IO_SIZE;
600 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
601 bsize = NFS_MAX_FILE_IO_SIZE;
602
603 return nfs_block_bits(bsize, nrbitsp);
604}
605
606/*
607 * Determine the maximum file size for a superblock
608 */
609static inline
610void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
611{
612 sb->s_maxbytes = (loff_t)maxfilesize;
613 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
614 sb->s_maxbytes = MAX_LFS_FILESIZE;
615}
616
617/*
618 * Record the page as unstable and mark its inode as dirty.
619 */
620static inline
621void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
622{
623 if (!cinfo->dreq) {
624 struct inode *inode = page_file_mapping(page)->host;
625
626 inc_zone_page_state(page, NR_UNSTABLE_NFS);
627 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
628 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
629 }
630}
631
632/*
633 * Determine the number of bytes of data the page contains
634 */
635static inline
636unsigned int nfs_page_length(struct page *page)
637{
638 loff_t i_size = i_size_read(page_file_mapping(page)->host);
639
640 if (i_size > 0) {
641 pgoff_t page_index = page_file_index(page);
642 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
643 if (page_index < end_index)
644 return PAGE_SIZE;
645 if (page_index == end_index)
646 return ((i_size - 1) & ~PAGE_MASK) + 1;
647 }
648 return 0;
649}
650
651/*
652 * Convert a umode to a dirent->d_type
653 */
654static inline
655unsigned char nfs_umode_to_dtype(umode_t mode)
656{
657 return (mode >> 12) & 15;
658}
659
660/*
661 * Determine the number of pages in an array of length 'len' and
662 * with a base offset of 'base'
663 */
664static inline
665unsigned int nfs_page_array_len(unsigned int base, size_t len)
666{
667 return ((unsigned long)len + (unsigned long)base +
668 PAGE_SIZE - 1) >> PAGE_SHIFT;
669}
670
671/*
672 * Convert a struct timespec into a 64-bit change attribute
673 *
674 * This does approximately the same thing as timespec_to_ns(),
675 * but for calculation efficiency, we multiply the seconds by
676 * 1024*1024*1024.
677 */
678static inline
679u64 nfs_timespec_to_change_attr(const struct timespec *ts)
680{
681 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
682}
683
684#ifdef CONFIG_CRC32
685/**
686 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
687 * @fh - pointer to filehandle
688 *
689 * returns a crc32 hash for the filehandle that is compatible with
690 * the one displayed by "wireshark".
691 */
692static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
693{
694 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
695}
696static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
697{
698 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
699 NFS4_STATEID_OTHER_SIZE);
700}
701#else
702static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
703{
704 return 0;
705}
706static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
707{
708 return 0;
709}
710#endif
711
712static inline bool nfs_error_is_fatal(int err)
713{
714 switch (err) {
715 case -ERESTARTSYS:
716 case -EIO:
717 case -ENOSPC:
718 case -EROFS:
719 case -E2BIG:
720 return true;
721 default:
722 return false;
723 }
724}
Linux kernel - Deliverables
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