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nfs41: pull nfs4_ds_connect from file layout to generic pnfs
[linux-block.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
10#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
11
12struct nfs_string;
13
14/* Maximum number of readahead requests
15 * FIXME: this should really be a sysctl so that users may tune it to suit
16 * their needs. People that do NFS over a slow network, might for
17 * instance want to reduce it to something closer to 1 for improved
18 * interactive response.
19 */
20#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
21
22static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
23{
24 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
25 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
26}
27
28static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
29{
30 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
31 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
32 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
33 return 0;
34
35 fattr->fileid = fattr->mounted_on_fileid;
36 return 1;
37}
38
39struct nfs_clone_mount {
40 const struct super_block *sb;
41 const struct dentry *dentry;
42 struct nfs_fh *fh;
43 struct nfs_fattr *fattr;
44 char *hostname;
45 char *mnt_path;
46 struct sockaddr *addr;
47 size_t addrlen;
48 rpc_authflavor_t authflavor;
49};
50
51/*
52 * Note: RFC 1813 doesn't limit the number of auth flavors that
53 * a server can return, so make something up.
54 */
55#define NFS_MAX_SECFLAVORS (12)
56
57/*
58 * Value used if the user did not specify a port value.
59 */
60#define NFS_UNSPEC_PORT (-1)
61
62/*
63 * Maximum number of pages that readdir can use for creating
64 * a vmapped array of pages.
65 */
66#define NFS_MAX_READDIR_PAGES 8
67
68struct nfs_client_initdata {
69 unsigned long init_flags;
70 const char *hostname;
71 const struct sockaddr *addr;
72 size_t addrlen;
73 struct nfs_subversion *nfs_mod;
74 int proto;
75 u32 minorversion;
76 struct net *net;
77};
78
79/*
80 * In-kernel mount arguments
81 */
82struct nfs_parsed_mount_data {
83 int flags;
84 unsigned int rsize, wsize;
85 unsigned int timeo, retrans;
86 unsigned int acregmin, acregmax,
87 acdirmin, acdirmax;
88 unsigned int namlen;
89 unsigned int options;
90 unsigned int bsize;
91 struct nfs_auth_info auth_info;
92 rpc_authflavor_t selected_flavor;
93 char *client_address;
94 unsigned int version;
95 unsigned int minorversion;
96 char *fscache_uniq;
97 bool need_mount;
98
99 struct {
100 struct sockaddr_storage address;
101 size_t addrlen;
102 char *hostname;
103 u32 version;
104 int port;
105 unsigned short protocol;
106 } mount_server;
107
108 struct {
109 struct sockaddr_storage address;
110 size_t addrlen;
111 char *hostname;
112 char *export_path;
113 int port;
114 unsigned short protocol;
115 } nfs_server;
116
117 struct security_mnt_opts lsm_opts;
118 struct net *net;
119};
120
121/* mount_clnt.c */
122struct nfs_mount_request {
123 struct sockaddr *sap;
124 size_t salen;
125 char *hostname;
126 char *dirpath;
127 u32 version;
128 unsigned short protocol;
129 struct nfs_fh *fh;
130 int noresvport;
131 unsigned int *auth_flav_len;
132 rpc_authflavor_t *auth_flavs;
133 struct net *net;
134};
135
136struct nfs_mount_info {
137 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
138 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
139 struct nfs_parsed_mount_data *parsed;
140 struct nfs_clone_mount *cloned;
141 struct nfs_fh *mntfh;
142};
143
144extern int nfs_mount(struct nfs_mount_request *info);
145extern void nfs_umount(const struct nfs_mount_request *info);
146
147/* client.c */
148extern const struct rpc_program nfs_program;
149extern void nfs_clients_init(struct net *net);
150extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
151int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
152struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
153 const struct rpc_timeout *, const char *,
154 rpc_authflavor_t);
155int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
156void nfs_server_insert_lists(struct nfs_server *);
157void nfs_server_remove_lists(struct nfs_server *);
158void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
159int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
160 rpc_authflavor_t);
161struct nfs_server *nfs_alloc_server(void);
162void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
163
164extern void nfs_cleanup_cb_ident_idr(struct net *);
165extern void nfs_put_client(struct nfs_client *);
166extern void nfs_free_client(struct nfs_client *);
167extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
168extern struct nfs_client *
169nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
170 struct nfs4_sessionid *, u32);
171extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
172 struct nfs_subversion *);
173extern struct nfs_server *nfs4_create_server(
174 struct nfs_mount_info *,
175 struct nfs_subversion *);
176extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
177 struct nfs_fh *);
178extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
179 struct sockaddr *sap, size_t salen,
180 struct net *net);
181extern void nfs_free_server(struct nfs_server *server);
182extern struct nfs_server *nfs_clone_server(struct nfs_server *,
183 struct nfs_fh *,
184 struct nfs_fattr *,
185 rpc_authflavor_t);
186extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
187extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
188extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
189 const struct sockaddr *ds_addr,
190 int ds_addrlen, int ds_proto,
191 unsigned int ds_timeo,
192 unsigned int ds_retrans);
193extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
194 struct inode *);
195#ifdef CONFIG_PROC_FS
196extern int __init nfs_fs_proc_init(void);
197extern void nfs_fs_proc_exit(void);
198extern int nfs_fs_proc_net_init(struct net *net);
199extern void nfs_fs_proc_net_exit(struct net *net);
200#else
201static inline int nfs_fs_proc_net_init(struct net *net)
202{
203 return 0;
204}
205static inline void nfs_fs_proc_net_exit(struct net *net)
206{
207}
208static inline int nfs_fs_proc_init(void)
209{
210 return 0;
211}
212static inline void nfs_fs_proc_exit(void)
213{
214}
215#endif
216
217#ifdef CONFIG_NFS_V4_1
218int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
219#endif
220
221/* callback_xdr.c */
222extern struct svc_version nfs4_callback_version1;
223extern struct svc_version nfs4_callback_version4;
224
225struct nfs_pageio_descriptor;
226/* pagelist.c */
227extern int __init nfs_init_nfspagecache(void);
228extern void nfs_destroy_nfspagecache(void);
229extern int __init nfs_init_readpagecache(void);
230extern void nfs_destroy_readpagecache(void);
231extern int __init nfs_init_writepagecache(void);
232extern void nfs_destroy_writepagecache(void);
233
234extern int __init nfs_init_directcache(void);
235extern void nfs_destroy_directcache(void);
236extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
237 struct nfs_pgio_header *hdr,
238 void (*release)(struct nfs_pgio_header *hdr));
239void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
240int nfs_iocounter_wait(struct nfs_io_counter *c);
241
242extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
243struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
244void nfs_pgio_header_free(struct nfs_pgio_header *);
245void nfs_pgio_data_destroy(struct nfs_pgio_header *);
246int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
247int nfs_initiate_pgio(struct rpc_clnt *, struct nfs_pgio_header *,
248 const struct rpc_call_ops *, int, int);
249void nfs_free_request(struct nfs_page *req);
250
251static inline void nfs_iocounter_init(struct nfs_io_counter *c)
252{
253 c->flags = 0;
254 atomic_set(&c->io_count, 0);
255}
256
257/* nfs2xdr.c */
258extern struct rpc_procinfo nfs_procedures[];
259extern int nfs2_decode_dirent(struct xdr_stream *,
260 struct nfs_entry *, int);
261
262/* nfs3xdr.c */
263extern struct rpc_procinfo nfs3_procedures[];
264extern int nfs3_decode_dirent(struct xdr_stream *,
265 struct nfs_entry *, int);
266
267/* nfs4xdr.c */
268#if IS_ENABLED(CONFIG_NFS_V4)
269extern int nfs4_decode_dirent(struct xdr_stream *,
270 struct nfs_entry *, int);
271#endif
272#ifdef CONFIG_NFS_V4_1
273extern const u32 nfs41_maxread_overhead;
274extern const u32 nfs41_maxwrite_overhead;
275extern const u32 nfs41_maxgetdevinfo_overhead;
276#endif
277
278/* nfs4proc.c */
279#if IS_ENABLED(CONFIG_NFS_V4)
280extern struct rpc_procinfo nfs4_procedures[];
281#endif
282
283#ifdef CONFIG_NFS_V4_SECURITY_LABEL
284extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
285static inline void nfs4_label_free(struct nfs4_label *label)
286{
287 if (label) {
288 kfree(label->label);
289 kfree(label);
290 }
291 return;
292}
293
294static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
295{
296 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
297 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
298}
299#else
300static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
301static inline void nfs4_label_free(void *label) {}
302static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
303{
304}
305#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
306
307/* proc.c */
308void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
309extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
310 const struct rpc_timeout *timeparms,
311 const char *ip_addr);
312
313/* dir.c */
314extern void nfs_force_use_readdirplus(struct inode *dir);
315extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
316 struct shrink_control *sc);
317extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
318 struct shrink_control *sc);
319struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
320int nfs_create(struct inode *, struct dentry *, umode_t, bool);
321int nfs_mkdir(struct inode *, struct dentry *, umode_t);
322int nfs_rmdir(struct inode *, struct dentry *);
323int nfs_unlink(struct inode *, struct dentry *);
324int nfs_symlink(struct inode *, struct dentry *, const char *);
325int nfs_link(struct dentry *, struct inode *, struct dentry *);
326int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
327int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
328
329/* file.c */
330int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
331loff_t nfs_file_llseek(struct file *, loff_t, int);
332int nfs_file_flush(struct file *, fl_owner_t);
333ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
334ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
335 size_t, unsigned int);
336int nfs_file_mmap(struct file *, struct vm_area_struct *);
337ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
338int nfs_file_release(struct inode *, struct file *);
339int nfs_lock(struct file *, int, struct file_lock *);
340int nfs_flock(struct file *, int, struct file_lock *);
341int nfs_check_flags(int);
342
343/* inode.c */
344extern struct workqueue_struct *nfsiod_workqueue;
345extern struct inode *nfs_alloc_inode(struct super_block *sb);
346extern void nfs_destroy_inode(struct inode *);
347extern int nfs_write_inode(struct inode *, struct writeback_control *);
348extern int nfs_drop_inode(struct inode *);
349extern void nfs_clear_inode(struct inode *);
350extern void nfs_evict_inode(struct inode *);
351void nfs_zap_acl_cache(struct inode *inode);
352extern int nfs_wait_bit_killable(struct wait_bit_key *key);
353
354/* super.c */
355extern const struct super_operations nfs_sops;
356extern struct file_system_type nfs_fs_type;
357extern struct file_system_type nfs_xdev_fs_type;
358#if IS_ENABLED(CONFIG_NFS_V4)
359extern struct file_system_type nfs4_xdev_fs_type;
360extern struct file_system_type nfs4_referral_fs_type;
361#endif
362bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
363struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
364 struct nfs_subversion *);
365void nfs_initialise_sb(struct super_block *);
366int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
367int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
368struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
369 struct nfs_mount_info *, struct nfs_subversion *);
370struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
371struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
372 const char *, struct nfs_mount_info *);
373void nfs_kill_super(struct super_block *);
374void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
375
376extern struct rpc_stat nfs_rpcstat;
377
378extern int __init register_nfs_fs(void);
379extern void __exit unregister_nfs_fs(void);
380extern void nfs_sb_active(struct super_block *sb);
381extern void nfs_sb_deactive(struct super_block *sb);
382
383/* namespace.c */
384#define NFS_PATH_CANONICAL 1
385extern char *nfs_path(char **p, struct dentry *dentry,
386 char *buffer, ssize_t buflen, unsigned flags);
387extern struct vfsmount *nfs_d_automount(struct path *path);
388struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
389 struct nfs_fh *, struct nfs_fattr *);
390struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
391 struct nfs_fattr *, rpc_authflavor_t);
392
393/* getroot.c */
394extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
395 const char *);
396#if IS_ENABLED(CONFIG_NFS_V4)
397extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
398 const char *);
399
400extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
401#endif
402
403struct nfs_pgio_completion_ops;
404/* read.c */
405extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
406 struct inode *inode, bool force_mds,
407 const struct nfs_pgio_completion_ops *compl_ops);
408extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
409extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
410
411/* super.c */
412void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
413void nfs_umount_begin(struct super_block *);
414int nfs_statfs(struct dentry *, struct kstatfs *);
415int nfs_show_options(struct seq_file *, struct dentry *);
416int nfs_show_devname(struct seq_file *, struct dentry *);
417int nfs_show_path(struct seq_file *, struct dentry *);
418int nfs_show_stats(struct seq_file *, struct dentry *);
419void nfs_put_super(struct super_block *);
420int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
421
422/* write.c */
423extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
424 struct inode *inode, int ioflags, bool force_mds,
425 const struct nfs_pgio_completion_ops *compl_ops);
426extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
427extern void nfs_commit_free(struct nfs_commit_data *p);
428extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
429extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
430extern int nfs_initiate_commit(struct rpc_clnt *clnt,
431 struct nfs_commit_data *data,
432 const struct rpc_call_ops *call_ops,
433 int how, int flags);
434extern void nfs_init_commit(struct nfs_commit_data *data,
435 struct list_head *head,
436 struct pnfs_layout_segment *lseg,
437 struct nfs_commit_info *cinfo);
438int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
439 struct nfs_commit_info *cinfo, int max);
440unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
441int nfs_scan_commit(struct inode *inode, struct list_head *dst,
442 struct nfs_commit_info *cinfo);
443void nfs_mark_request_commit(struct nfs_page *req,
444 struct pnfs_layout_segment *lseg,
445 struct nfs_commit_info *cinfo);
446int nfs_write_need_commit(struct nfs_pgio_header *);
447int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
448 int how, struct nfs_commit_info *cinfo);
449void nfs_retry_commit(struct list_head *page_list,
450 struct pnfs_layout_segment *lseg,
451 struct nfs_commit_info *cinfo);
452void nfs_commitdata_release(struct nfs_commit_data *data);
453void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
454 struct nfs_commit_info *cinfo);
455void nfs_request_remove_commit_list(struct nfs_page *req,
456 struct nfs_commit_info *cinfo);
457void nfs_init_cinfo(struct nfs_commit_info *cinfo,
458 struct inode *inode,
459 struct nfs_direct_req *dreq);
460int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
461bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
462
463#ifdef CONFIG_MIGRATION
464extern int nfs_migrate_page(struct address_space *,
465 struct page *, struct page *, enum migrate_mode);
466#else
467#define nfs_migrate_page NULL
468#endif
469
470/* unlink.c */
471extern struct rpc_task *
472nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
473 struct dentry *old_dentry, struct dentry *new_dentry,
474 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
475extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
476
477/* direct.c */
478void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
479 struct nfs_direct_req *dreq);
480static inline void nfs_inode_dio_wait(struct inode *inode)
481{
482 inode_dio_wait(inode);
483}
484extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
485
486/* nfs4proc.c */
487extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
488extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
489 const struct rpc_timeout *timeparms,
490 const char *ip_addr);
491extern int nfs40_walk_client_list(struct nfs_client *clp,
492 struct nfs_client **result,
493 struct rpc_cred *cred);
494extern int nfs41_walk_client_list(struct nfs_client *clp,
495 struct nfs_client **result,
496 struct rpc_cred *cred);
497
498/*
499 * Determine the device name as a string
500 */
501static inline char *nfs_devname(struct dentry *dentry,
502 char *buffer, ssize_t buflen)
503{
504 char *dummy;
505 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
506}
507
508/*
509 * Determine the actual block size (and log2 thereof)
510 */
511static inline
512unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
513{
514 /* make sure blocksize is a power of two */
515 if ((bsize & (bsize - 1)) || nrbitsp) {
516 unsigned char nrbits;
517
518 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
519 ;
520 bsize = 1 << nrbits;
521 if (nrbitsp)
522 *nrbitsp = nrbits;
523 }
524
525 return bsize;
526}
527
528/*
529 * Calculate the number of 512byte blocks used.
530 */
531static inline blkcnt_t nfs_calc_block_size(u64 tsize)
532{
533 blkcnt_t used = (tsize + 511) >> 9;
534 return (used > ULONG_MAX) ? ULONG_MAX : used;
535}
536
537/*
538 * Compute and set NFS server blocksize
539 */
540static inline
541unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
542{
543 if (bsize < NFS_MIN_FILE_IO_SIZE)
544 bsize = NFS_DEF_FILE_IO_SIZE;
545 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
546 bsize = NFS_MAX_FILE_IO_SIZE;
547
548 return nfs_block_bits(bsize, nrbitsp);
549}
550
551/*
552 * Determine the maximum file size for a superblock
553 */
554static inline
555void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
556{
557 sb->s_maxbytes = (loff_t)maxfilesize;
558 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
559 sb->s_maxbytes = MAX_LFS_FILESIZE;
560}
561
562/*
563 * Determine the number of bytes of data the page contains
564 */
565static inline
566unsigned int nfs_page_length(struct page *page)
567{
568 loff_t i_size = i_size_read(page_file_mapping(page)->host);
569
570 if (i_size > 0) {
571 pgoff_t page_index = page_file_index(page);
572 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
573 if (page_index < end_index)
574 return PAGE_CACHE_SIZE;
575 if (page_index == end_index)
576 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
577 }
578 return 0;
579}
580
581/*
582 * Convert a umode to a dirent->d_type
583 */
584static inline
585unsigned char nfs_umode_to_dtype(umode_t mode)
586{
587 return (mode >> 12) & 15;
588}
589
590/*
591 * Determine the number of pages in an array of length 'len' and
592 * with a base offset of 'base'
593 */
594static inline
595unsigned int nfs_page_array_len(unsigned int base, size_t len)
596{
597 return ((unsigned long)len + (unsigned long)base +
598 PAGE_SIZE - 1) >> PAGE_SHIFT;
599}
600
601/*
602 * Convert a struct timespec into a 64-bit change attribute
603 *
604 * This does approximately the same thing as timespec_to_ns(),
605 * but for calculation efficiency, we multiply the seconds by
606 * 1024*1024*1024.
607 */
608static inline
609u64 nfs_timespec_to_change_attr(const struct timespec *ts)
610{
611 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
612}
613
614#ifdef CONFIG_CRC32
615/**
616 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
617 * @fh - pointer to filehandle
618 *
619 * returns a crc32 hash for the filehandle that is compatible with
620 * the one displayed by "wireshark".
621 */
622static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
623{
624 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
625}
626#else
627static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
628{
629 return 0;
630}
631#endif
Linux 6.x block layer and io_uring tree(s)