2 * NFS internal definitions
6 #include <linux/mount.h>
7 #include <linux/security.h>
8 #include <linux/crc32.h>
9 #include <linux/nfs_page.h>
11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
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.
21 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
23 static inline void nfs_attr_check_mountpoint(struct super_block
*parent
, struct nfs_fattr
*fattr
)
25 if (!nfs_fsid_equal(&NFS_SB(parent
)->fsid
, &fattr
->fsid
))
26 fattr
->valid
|= NFS_ATTR_FATTR_MOUNTPOINT
;
29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr
*fattr
)
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)))
38 struct nfs_clone_mount
{
39 const struct super_block
*sb
;
40 const struct dentry
*dentry
;
42 struct nfs_fattr
*fattr
;
45 struct sockaddr
*addr
;
47 rpc_authflavor_t authflavor
;
51 * Note: RFC 1813 doesn't limit the number of auth flavors that
52 * a server can return, so make something up.
54 #define NFS_MAX_SECFLAVORS (12)
57 * Value used if the user did not specify a port value.
59 #define NFS_UNSPEC_PORT (-1)
62 * Maximum number of pages that readdir can use for creating
63 * a vmapped array of pages.
65 #define NFS_MAX_READDIR_PAGES 8
67 struct nfs_client_initdata
{
68 unsigned long init_flags
;
70 const struct sockaddr
*addr
;
72 struct nfs_subversion
*nfs_mod
;
79 * In-kernel mount arguments
81 struct nfs_parsed_mount_data
{
83 unsigned int rsize
, wsize
;
84 unsigned int timeo
, retrans
;
85 unsigned int acregmin
, acregmax
,
90 struct nfs_auth_info auth_info
;
91 rpc_authflavor_t selected_flavor
;
94 unsigned int minorversion
;
99 struct sockaddr_storage address
;
104 unsigned short protocol
;
108 struct sockaddr_storage address
;
113 unsigned short protocol
;
116 struct security_mnt_opts lsm_opts
;
121 struct nfs_mount_request
{
122 struct sockaddr
*sap
;
127 unsigned short protocol
;
130 unsigned int *auth_flav_len
;
131 rpc_authflavor_t
*auth_flavs
;
135 struct nfs_mount_info
{
136 void (*fill_super
)(struct super_block
*, struct nfs_mount_info
*);
137 int (*set_security
)(struct super_block
*, struct dentry
*, struct nfs_mount_info
*);
138 struct nfs_parsed_mount_data
*parsed
;
139 struct nfs_clone_mount
*cloned
;
140 struct nfs_fh
*mntfh
;
143 extern int nfs_mount(struct nfs_mount_request
*info
);
144 extern void nfs_umount(const struct nfs_mount_request
*info
);
147 extern const struct rpc_program nfs_program
;
148 extern void nfs_clients_init(struct net
*net
);
149 extern struct nfs_client
*nfs_alloc_client(const struct nfs_client_initdata
*);
150 int nfs_create_rpc_client(struct nfs_client
*, const struct rpc_timeout
*, rpc_authflavor_t
);
151 struct nfs_client
*nfs_get_client(const struct nfs_client_initdata
*,
152 const struct rpc_timeout
*, const char *,
154 int nfs_probe_fsinfo(struct nfs_server
*server
, struct nfs_fh
*, struct nfs_fattr
*);
155 void nfs_server_insert_lists(struct nfs_server
*);
156 void nfs_server_remove_lists(struct nfs_server
*);
157 void nfs_init_timeout_values(struct rpc_timeout
*, int, unsigned int, unsigned int);
158 int nfs_init_server_rpcclient(struct nfs_server
*, const struct rpc_timeout
*t
,
160 struct nfs_server
*nfs_alloc_server(void);
161 void nfs_server_copy_userdata(struct nfs_server
*, struct nfs_server
*);
163 extern void nfs_cleanup_cb_ident_idr(struct net
*);
164 extern void nfs_put_client(struct nfs_client
*);
165 extern void nfs_free_client(struct nfs_client
*);
166 extern struct nfs_client
*nfs4_find_client_ident(struct net
*, int);
167 extern struct nfs_client
*
168 nfs4_find_client_sessionid(struct net
*, const struct sockaddr
*,
169 struct nfs4_sessionid
*, u32
);
170 extern struct nfs_server
*nfs_create_server(struct nfs_mount_info
*,
171 struct nfs_subversion
*);
172 extern struct nfs_server
*nfs4_create_server(
173 struct nfs_mount_info
*,
174 struct nfs_subversion
*);
175 extern struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*,
177 extern int nfs4_update_server(struct nfs_server
*server
, const char *hostname
,
178 struct sockaddr
*sap
, size_t salen
,
180 extern void nfs_free_server(struct nfs_server
*server
);
181 extern struct nfs_server
*nfs_clone_server(struct nfs_server
*,
185 extern int nfs_wait_client_init_complete(const struct nfs_client
*clp
);
186 extern void nfs_mark_client_ready(struct nfs_client
*clp
, int state
);
187 extern struct nfs_client
*nfs4_set_ds_client(struct nfs_client
* mds_clp
,
188 const struct sockaddr
*ds_addr
,
189 int ds_addrlen
, int ds_proto
,
190 unsigned int ds_timeo
,
191 unsigned int ds_retrans
,
193 rpc_authflavor_t au_flavor
);
194 extern struct rpc_clnt
*nfs4_find_or_create_ds_client(struct nfs_client
*,
196 extern struct nfs_client
*nfs3_set_ds_client(struct nfs_client
*mds_clp
,
197 const struct sockaddr
*ds_addr
, int ds_addrlen
,
198 int ds_proto
, unsigned int ds_timeo
,
199 unsigned int ds_retrans
, rpc_authflavor_t au_flavor
);
200 #ifdef CONFIG_PROC_FS
201 extern int __init
nfs_fs_proc_init(void);
202 extern void nfs_fs_proc_exit(void);
203 extern int nfs_fs_proc_net_init(struct net
*net
);
204 extern void nfs_fs_proc_net_exit(struct net
*net
);
206 static inline int nfs_fs_proc_net_init(struct net
*net
)
210 static inline void nfs_fs_proc_net_exit(struct net
*net
)
213 static inline int nfs_fs_proc_init(void)
217 static inline void nfs_fs_proc_exit(void)
222 #ifdef CONFIG_NFS_V4_1
223 int nfs_sockaddr_match_ipaddr(const struct sockaddr
*, const struct sockaddr
*);
227 extern struct svc_version nfs4_callback_version1
;
228 extern struct svc_version nfs4_callback_version4
;
230 struct nfs_pageio_descriptor
;
232 extern int __init
nfs_init_nfspagecache(void);
233 extern void nfs_destroy_nfspagecache(void);
234 extern int __init
nfs_init_readpagecache(void);
235 extern void nfs_destroy_readpagecache(void);
236 extern int __init
nfs_init_writepagecache(void);
237 extern void nfs_destroy_writepagecache(void);
239 extern int __init
nfs_init_directcache(void);
240 extern void nfs_destroy_directcache(void);
241 extern void nfs_pgheader_init(struct nfs_pageio_descriptor
*desc
,
242 struct nfs_pgio_header
*hdr
,
243 void (*release
)(struct nfs_pgio_header
*hdr
));
244 void nfs_set_pgio_error(struct nfs_pgio_header
*hdr
, int error
, loff_t pos
);
245 int nfs_iocounter_wait(struct nfs_io_counter
*c
);
247 extern const struct nfs_pageio_ops nfs_pgio_rw_ops
;
248 struct nfs_pgio_header
*nfs_pgio_header_alloc(const struct nfs_rw_ops
*);
249 void nfs_pgio_header_free(struct nfs_pgio_header
*);
250 void nfs_pgio_data_destroy(struct nfs_pgio_header
*);
251 int nfs_generic_pgio(struct nfs_pageio_descriptor
*, struct nfs_pgio_header
*);
252 int nfs_initiate_pgio(struct rpc_clnt
*clnt
, struct nfs_pgio_header
*hdr
,
253 struct rpc_cred
*cred
, const struct nfs_rpc_ops
*rpc_ops
,
254 const struct rpc_call_ops
*call_ops
, int how
, int flags
);
255 void nfs_free_request(struct nfs_page
*req
);
256 struct nfs_pgio_mirror
*
257 nfs_pgio_current_mirror(struct nfs_pageio_descriptor
*desc
);
259 static inline void nfs_iocounter_init(struct nfs_io_counter
*c
)
262 atomic_set(&c
->io_count
, 0);
265 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor
*desc
)
267 WARN_ON_ONCE(desc
->pg_mirror_count
< 1);
268 return desc
->pg_mirror_count
> 1;
272 extern struct rpc_procinfo nfs_procedures
[];
273 extern int nfs2_decode_dirent(struct xdr_stream
*,
274 struct nfs_entry
*, int);
277 extern struct rpc_procinfo nfs3_procedures
[];
278 extern int nfs3_decode_dirent(struct xdr_stream
*,
279 struct nfs_entry
*, int);
282 #if IS_ENABLED(CONFIG_NFS_V4)
283 extern int nfs4_decode_dirent(struct xdr_stream
*,
284 struct nfs_entry
*, int);
286 #ifdef CONFIG_NFS_V4_1
287 extern const u32 nfs41_maxread_overhead
;
288 extern const u32 nfs41_maxwrite_overhead
;
289 extern const u32 nfs41_maxgetdevinfo_overhead
;
293 #if IS_ENABLED(CONFIG_NFS_V4)
294 extern struct rpc_procinfo nfs4_procedures
[];
297 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
298 extern struct nfs4_label
*nfs4_label_alloc(struct nfs_server
*server
, gfp_t flags
);
299 static inline void nfs4_label_free(struct nfs4_label
*label
)
308 static inline void nfs_zap_label_cache_locked(struct nfs_inode
*nfsi
)
310 if (nfs_server_capable(&nfsi
->vfs_inode
, NFS_CAP_SECURITY_LABEL
))
311 nfsi
->cache_validity
|= NFS_INO_INVALID_LABEL
;
314 static inline struct nfs4_label
*nfs4_label_alloc(struct nfs_server
*server
, gfp_t flags
) { return NULL
; }
315 static inline void nfs4_label_free(void *label
) {}
316 static inline void nfs_zap_label_cache_locked(struct nfs_inode
*nfsi
)
319 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
322 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
);
323 extern struct nfs_client
*nfs_init_client(struct nfs_client
*clp
,
324 const struct rpc_timeout
*timeparms
,
325 const char *ip_addr
);
328 extern void nfs_force_use_readdirplus(struct inode
*dir
);
329 extern unsigned long nfs_access_cache_count(struct shrinker
*shrink
,
330 struct shrink_control
*sc
);
331 extern unsigned long nfs_access_cache_scan(struct shrinker
*shrink
,
332 struct shrink_control
*sc
);
333 struct dentry
*nfs_lookup(struct inode
*, struct dentry
*, unsigned int);
334 int nfs_create(struct inode
*, struct dentry
*, umode_t
, bool);
335 int nfs_mkdir(struct inode
*, struct dentry
*, umode_t
);
336 int nfs_rmdir(struct inode
*, struct dentry
*);
337 int nfs_unlink(struct inode
*, struct dentry
*);
338 int nfs_symlink(struct inode
*, struct dentry
*, const char *);
339 int nfs_link(struct dentry
*, struct inode
*, struct dentry
*);
340 int nfs_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
341 int nfs_rename(struct inode
*, struct dentry
*, struct inode
*, struct dentry
*);
344 int nfs_file_fsync_commit(struct file
*, loff_t
, loff_t
, int);
345 loff_t
nfs_file_llseek(struct file
*, loff_t
, int);
346 int nfs_file_flush(struct file
*, fl_owner_t
);
347 ssize_t
nfs_file_read(struct kiocb
*, struct iov_iter
*);
348 ssize_t
nfs_file_splice_read(struct file
*, loff_t
*, struct pipe_inode_info
*,
349 size_t, unsigned int);
350 int nfs_file_mmap(struct file
*, struct vm_area_struct
*);
351 ssize_t
nfs_file_write(struct kiocb
*, struct iov_iter
*);
352 int nfs_file_release(struct inode
*, struct file
*);
353 int nfs_lock(struct file
*, int, struct file_lock
*);
354 int nfs_flock(struct file
*, int, struct file_lock
*);
355 int nfs_check_flags(int);
358 extern struct workqueue_struct
*nfsiod_workqueue
;
359 extern struct inode
*nfs_alloc_inode(struct super_block
*sb
);
360 extern void nfs_destroy_inode(struct inode
*);
361 extern int nfs_write_inode(struct inode
*, struct writeback_control
*);
362 extern int nfs_drop_inode(struct inode
*);
363 extern void nfs_clear_inode(struct inode
*);
364 extern void nfs_evict_inode(struct inode
*);
365 void nfs_zap_acl_cache(struct inode
*inode
);
366 extern int nfs_wait_bit_killable(struct wait_bit_key
*key
);
369 extern const struct super_operations nfs_sops
;
370 extern struct file_system_type nfs_fs_type
;
371 extern struct file_system_type nfs_xdev_fs_type
;
372 #if IS_ENABLED(CONFIG_NFS_V4)
373 extern struct file_system_type nfs4_xdev_fs_type
;
374 extern struct file_system_type nfs4_referral_fs_type
;
376 bool nfs_auth_info_match(const struct nfs_auth_info
*, rpc_authflavor_t
);
377 struct dentry
*nfs_try_mount(int, const char *, struct nfs_mount_info
*,
378 struct nfs_subversion
*);
379 void nfs_initialise_sb(struct super_block
*);
380 int nfs_set_sb_security(struct super_block
*, struct dentry
*, struct nfs_mount_info
*);
381 int nfs_clone_sb_security(struct super_block
*, struct dentry
*, struct nfs_mount_info
*);
382 struct dentry
*nfs_fs_mount_common(struct nfs_server
*, int, const char *,
383 struct nfs_mount_info
*, struct nfs_subversion
*);
384 struct dentry
*nfs_fs_mount(struct file_system_type
*, int, const char *, void *);
385 struct dentry
* nfs_xdev_mount_common(struct file_system_type
*, int,
386 const char *, struct nfs_mount_info
*);
387 void nfs_kill_super(struct super_block
*);
388 void nfs_fill_super(struct super_block
*, struct nfs_mount_info
*);
390 extern struct rpc_stat nfs_rpcstat
;
392 extern int __init
register_nfs_fs(void);
393 extern void __exit
unregister_nfs_fs(void);
394 extern bool nfs_sb_active(struct super_block
*sb
);
395 extern void nfs_sb_deactive(struct super_block
*sb
);
398 #define NFS_PATH_CANONICAL 1
399 extern char *nfs_path(char **p
, struct dentry
*dentry
,
400 char *buffer
, ssize_t buflen
, unsigned flags
);
401 extern struct vfsmount
*nfs_d_automount(struct path
*path
);
402 struct vfsmount
*nfs_submount(struct nfs_server
*, struct dentry
*,
403 struct nfs_fh
*, struct nfs_fattr
*);
404 struct vfsmount
*nfs_do_submount(struct dentry
*, struct nfs_fh
*,
405 struct nfs_fattr
*, rpc_authflavor_t
);
408 extern struct dentry
*nfs_get_root(struct super_block
*, struct nfs_fh
*,
410 #if IS_ENABLED(CONFIG_NFS_V4)
411 extern struct dentry
*nfs4_get_root(struct super_block
*, struct nfs_fh
*,
414 extern int nfs4_get_rootfh(struct nfs_server
*server
, struct nfs_fh
*mntfh
, bool);
417 struct nfs_pgio_completion_ops
;
419 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor
*pgio
,
420 struct inode
*inode
, bool force_mds
,
421 const struct nfs_pgio_completion_ops
*compl_ops
);
422 extern void nfs_read_prepare(struct rpc_task
*task
, void *calldata
);
423 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor
*pgio
);
426 void nfs_clone_super(struct super_block
*, struct nfs_mount_info
*);
427 void nfs_umount_begin(struct super_block
*);
428 int nfs_statfs(struct dentry
*, struct kstatfs
*);
429 int nfs_show_options(struct seq_file
*, struct dentry
*);
430 int nfs_show_devname(struct seq_file
*, struct dentry
*);
431 int nfs_show_path(struct seq_file
*, struct dentry
*);
432 int nfs_show_stats(struct seq_file
*, struct dentry
*);
433 void nfs_put_super(struct super_block
*);
434 int nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
);
437 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor
*pgio
,
438 struct inode
*inode
, int ioflags
, bool force_mds
,
439 const struct nfs_pgio_completion_ops
*compl_ops
);
440 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor
*pgio
);
441 extern void nfs_commit_free(struct nfs_commit_data
*p
);
442 extern void nfs_write_prepare(struct rpc_task
*task
, void *calldata
);
443 extern void nfs_commit_prepare(struct rpc_task
*task
, void *calldata
);
444 extern int nfs_initiate_commit(struct rpc_clnt
*clnt
,
445 struct nfs_commit_data
*data
,
446 const struct nfs_rpc_ops
*nfs_ops
,
447 const struct rpc_call_ops
*call_ops
,
449 extern void nfs_init_commit(struct nfs_commit_data
*data
,
450 struct list_head
*head
,
451 struct pnfs_layout_segment
*lseg
,
452 struct nfs_commit_info
*cinfo
);
453 int nfs_scan_commit_list(struct list_head
*src
, struct list_head
*dst
,
454 struct nfs_commit_info
*cinfo
, int max
);
455 unsigned long nfs_reqs_to_commit(struct nfs_commit_info
*);
456 int nfs_scan_commit(struct inode
*inode
, struct list_head
*dst
,
457 struct nfs_commit_info
*cinfo
);
458 void nfs_mark_request_commit(struct nfs_page
*req
,
459 struct pnfs_layout_segment
*lseg
,
460 struct nfs_commit_info
*cinfo
,
462 int nfs_write_need_commit(struct nfs_pgio_header
*);
463 int nfs_generic_commit_list(struct inode
*inode
, struct list_head
*head
,
464 int how
, struct nfs_commit_info
*cinfo
);
465 void nfs_retry_commit(struct list_head
*page_list
,
466 struct pnfs_layout_segment
*lseg
,
467 struct nfs_commit_info
*cinfo
,
469 void nfs_commitdata_release(struct nfs_commit_data
*data
);
470 void nfs_request_add_commit_list(struct nfs_page
*req
, struct list_head
*dst
,
471 struct nfs_commit_info
*cinfo
);
472 void nfs_request_remove_commit_list(struct nfs_page
*req
,
473 struct nfs_commit_info
*cinfo
);
474 void nfs_init_cinfo(struct nfs_commit_info
*cinfo
,
476 struct nfs_direct_req
*dreq
);
477 int nfs_key_timeout_notify(struct file
*filp
, struct inode
*inode
);
478 bool nfs_ctx_key_to_expire(struct nfs_open_context
*ctx
);
479 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor
*pgio
);
481 #ifdef CONFIG_MIGRATION
482 extern int nfs_migrate_page(struct address_space
*,
483 struct page
*, struct page
*, enum migrate_mode
);
485 #define nfs_migrate_page NULL
489 extern struct rpc_task
*
490 nfs_async_rename(struct inode
*old_dir
, struct inode
*new_dir
,
491 struct dentry
*old_dentry
, struct dentry
*new_dentry
,
492 void (*complete
)(struct rpc_task
*, struct nfs_renamedata
*));
493 extern int nfs_sillyrename(struct inode
*dir
, struct dentry
*dentry
);
496 void nfs_init_cinfo_from_dreq(struct nfs_commit_info
*cinfo
,
497 struct nfs_direct_req
*dreq
);
498 static inline void nfs_inode_dio_wait(struct inode
*inode
)
500 inode_dio_wait(inode
);
502 extern ssize_t
nfs_dreq_bytes_left(struct nfs_direct_req
*dreq
);
503 extern void nfs_direct_set_resched_writes(struct nfs_direct_req
*dreq
);
506 extern void __nfs4_read_done_cb(struct nfs_pgio_header
*);
507 extern struct nfs_client
*nfs4_init_client(struct nfs_client
*clp
,
508 const struct rpc_timeout
*timeparms
,
509 const char *ip_addr
);
510 extern int nfs40_walk_client_list(struct nfs_client
*clp
,
511 struct nfs_client
**result
,
512 struct rpc_cred
*cred
);
513 extern int nfs41_walk_client_list(struct nfs_client
*clp
,
514 struct nfs_client
**result
,
515 struct rpc_cred
*cred
);
517 static inline struct inode
*nfs_igrab_and_active(struct inode
*inode
)
519 inode
= igrab(inode
);
520 if (inode
!= NULL
&& !nfs_sb_active(inode
->i_sb
)) {
527 static inline void nfs_iput_and_deactive(struct inode
*inode
)
530 struct super_block
*sb
= inode
->i_sb
;
538 * Determine the device name as a string
540 static inline char *nfs_devname(struct dentry
*dentry
,
541 char *buffer
, ssize_t buflen
)
544 return nfs_path(&dummy
, dentry
, buffer
, buflen
, NFS_PATH_CANONICAL
);
548 * Determine the actual block size (and log2 thereof)
551 unsigned long nfs_block_bits(unsigned long bsize
, unsigned char *nrbitsp
)
553 /* make sure blocksize is a power of two */
554 if ((bsize
& (bsize
- 1)) || nrbitsp
) {
555 unsigned char nrbits
;
557 for (nrbits
= 31; nrbits
&& !(bsize
& (1 << nrbits
)); nrbits
--)
568 * Calculate the number of 512byte blocks used.
570 static inline blkcnt_t
nfs_calc_block_size(u64 tsize
)
572 blkcnt_t used
= (tsize
+ 511) >> 9;
573 return (used
> ULONG_MAX
) ? ULONG_MAX
: used
;
577 * Compute and set NFS server blocksize
580 unsigned long nfs_block_size(unsigned long bsize
, unsigned char *nrbitsp
)
582 if (bsize
< NFS_MIN_FILE_IO_SIZE
)
583 bsize
= NFS_DEF_FILE_IO_SIZE
;
584 else if (bsize
>= NFS_MAX_FILE_IO_SIZE
)
585 bsize
= NFS_MAX_FILE_IO_SIZE
;
587 return nfs_block_bits(bsize
, nrbitsp
);
591 * Determine the maximum file size for a superblock
594 void nfs_super_set_maxbytes(struct super_block
*sb
, __u64 maxfilesize
)
596 sb
->s_maxbytes
= (loff_t
)maxfilesize
;
597 if (sb
->s_maxbytes
> MAX_LFS_FILESIZE
|| sb
->s_maxbytes
<= 0)
598 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
602 * Determine the number of bytes of data the page contains
605 unsigned int nfs_page_length(struct page
*page
)
607 loff_t i_size
= i_size_read(page_file_mapping(page
)->host
);
610 pgoff_t page_index
= page_file_index(page
);
611 pgoff_t end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
612 if (page_index
< end_index
)
613 return PAGE_CACHE_SIZE
;
614 if (page_index
== end_index
)
615 return ((i_size
- 1) & ~PAGE_CACHE_MASK
) + 1;
621 * Convert a umode to a dirent->d_type
624 unsigned char nfs_umode_to_dtype(umode_t mode
)
626 return (mode
>> 12) & 15;
630 * Determine the number of pages in an array of length 'len' and
631 * with a base offset of 'base'
634 unsigned int nfs_page_array_len(unsigned int base
, size_t len
)
636 return ((unsigned long)len
+ (unsigned long)base
+
637 PAGE_SIZE
- 1) >> PAGE_SHIFT
;
641 * Convert a struct timespec into a 64-bit change attribute
643 * This does approximately the same thing as timespec_to_ns(),
644 * but for calculation efficiency, we multiply the seconds by
648 u64
nfs_timespec_to_change_attr(const struct timespec
*ts
)
650 return ((u64
)ts
->tv_sec
<< 30) + ts
->tv_nsec
;
655 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
656 * @fh - pointer to filehandle
658 * returns a crc32 hash for the filehandle that is compatible with
659 * the one displayed by "wireshark".
661 static inline u32
nfs_fhandle_hash(const struct nfs_fh
*fh
)
663 return ~crc32_le(0xFFFFFFFF, &fh
->data
[0], fh
->size
);
666 static inline u32
nfs_fhandle_hash(const struct nfs_fh
*fh
)