2 * NFS internal definitions
6 #include <linux/mount.h>
7 #include <linux/security.h>
9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
13 /* Maximum number of readahead requests
14 * FIXME: this should really be a sysctl so that users may tune it to suit
15 * their needs. People that do NFS over a slow network, might for
16 * instance want to reduce it to something closer to 1 for improved
17 * interactive response.
19 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
22 * Determine if sessions are in use.
24 static inline int nfs4_has_session(const struct nfs_client
*clp
)
26 #ifdef CONFIG_NFS_V4_1
29 #endif /* CONFIG_NFS_V4_1 */
33 static inline int nfs4_has_persistent_session(const struct nfs_client
*clp
)
35 #ifdef CONFIG_NFS_V4_1
36 if (nfs4_has_session(clp
))
37 return (clp
->cl_session
->flags
& SESSION4_PERSIST
);
38 #endif /* CONFIG_NFS_V4_1 */
42 static inline void nfs_attr_check_mountpoint(struct super_block
*parent
, struct nfs_fattr
*fattr
)
44 if (!nfs_fsid_equal(&NFS_SB(parent
)->fsid
, &fattr
->fsid
))
45 fattr
->valid
|= NFS_ATTR_FATTR_MOUNTPOINT
;
48 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr
*fattr
)
50 if (((fattr
->valid
& NFS_ATTR_FATTR_MOUNTED_ON_FILEID
) == 0) ||
51 (((fattr
->valid
& NFS_ATTR_FATTR_MOUNTPOINT
) == 0) &&
52 ((fattr
->valid
& NFS_ATTR_FATTR_V4_REFERRAL
) == 0)))
55 fattr
->fileid
= fattr
->mounted_on_fileid
;
59 struct nfs_clone_mount
{
60 const struct super_block
*sb
;
61 const struct dentry
*dentry
;
63 struct nfs_fattr
*fattr
;
66 struct sockaddr
*addr
;
68 rpc_authflavor_t authflavor
;
72 * Note: RFC 1813 doesn't limit the number of auth flavors that
73 * a server can return, so make something up.
75 #define NFS_MAX_SECFLAVORS (12)
78 * Value used if the user did not specify a port value.
80 #define NFS_UNSPEC_PORT (-1)
83 * Maximum number of pages that readdir can use for creating
84 * a vmapped array of pages.
86 #define NFS_MAX_READDIR_PAGES 8
89 * In-kernel mount arguments
91 struct nfs_parsed_mount_data
{
95 int acregmin
, acregmax
,
100 unsigned int auth_flavor_len
;
101 rpc_authflavor_t auth_flavors
[1];
102 char *client_address
;
103 unsigned int version
;
104 unsigned int minorversion
;
108 struct sockaddr_storage address
;
113 unsigned short protocol
;
117 struct sockaddr_storage address
;
122 unsigned short protocol
;
125 struct security_mnt_opts lsm_opts
;
130 struct nfs_mount_request
{
131 struct sockaddr
*sap
;
136 unsigned short protocol
;
139 unsigned int *auth_flav_len
;
140 rpc_authflavor_t
*auth_flavs
;
144 extern int nfs_mount(struct nfs_mount_request
*info
);
145 extern void nfs_umount(const struct nfs_mount_request
*info
);
148 extern const struct rpc_program nfs_program
;
149 extern void nfs_clients_init(struct net
*net
);
151 extern void nfs_cleanup_cb_ident_idr(struct net
*);
152 extern void nfs_put_client(struct nfs_client
*);
153 extern struct nfs_client
*nfs4_find_client_ident(struct net
*, int);
154 extern struct nfs_client
*
155 nfs4_find_client_sessionid(struct net
*, const struct sockaddr
*,
156 struct nfs4_sessionid
*);
157 extern struct nfs_server
*nfs_create_server(
158 const struct nfs_parsed_mount_data
*,
160 extern struct nfs_server
*nfs4_create_server(
161 const struct nfs_parsed_mount_data
*,
163 extern struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*,
165 extern void nfs_free_server(struct nfs_server
*server
);
166 extern struct nfs_server
*nfs_clone_server(struct nfs_server
*,
170 extern void nfs_mark_client_ready(struct nfs_client
*clp
, int state
);
171 extern int nfs4_check_client_ready(struct nfs_client
*clp
);
172 extern struct nfs_client
*nfs4_set_ds_client(struct nfs_client
* mds_clp
,
173 const struct sockaddr
*ds_addr
,
174 int ds_addrlen
, int ds_proto
);
175 #ifdef CONFIG_PROC_FS
176 extern int __init
nfs_fs_proc_init(void);
177 extern void nfs_fs_proc_exit(void);
179 static inline int nfs_fs_proc_init(void)
183 static inline void nfs_fs_proc_exit(void)
188 /* nfs4namespace.c */
190 extern struct vfsmount
*nfs_do_refmount(struct rpc_clnt
*client
, struct dentry
*dentry
);
193 struct vfsmount
*nfs_do_refmount(struct rpc_clnt
*client
, struct dentry
*dentry
)
195 return ERR_PTR(-ENOENT
);
200 extern struct svc_version nfs4_callback_version1
;
201 extern struct svc_version nfs4_callback_version4
;
204 extern int __init
nfs_init_nfspagecache(void);
205 extern void nfs_destroy_nfspagecache(void);
206 extern int __init
nfs_init_readpagecache(void);
207 extern void nfs_destroy_readpagecache(void);
208 extern int __init
nfs_init_writepagecache(void);
209 extern void nfs_destroy_writepagecache(void);
211 extern int __init
nfs_init_directcache(void);
212 extern void nfs_destroy_directcache(void);
215 extern int nfs_stat_to_errno(enum nfs_stat
);
216 extern struct rpc_procinfo nfs_procedures
[];
217 extern int nfs2_decode_dirent(struct xdr_stream
*,
218 struct nfs_entry
*, int);
221 extern struct rpc_procinfo nfs3_procedures
[];
222 extern int nfs3_decode_dirent(struct xdr_stream
*,
223 struct nfs_entry
*, int);
227 extern int nfs4_decode_dirent(struct xdr_stream
*,
228 struct nfs_entry
*, int);
230 #ifdef CONFIG_NFS_V4_1
231 extern const u32 nfs41_maxread_overhead
;
232 extern const u32 nfs41_maxwrite_overhead
;
237 extern struct rpc_procinfo nfs4_procedures
[];
240 extern int nfs4_init_ds_session(struct nfs_client
*clp
);
243 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
);
244 extern int nfs_init_client(struct nfs_client
*clp
,
245 const struct rpc_timeout
*timeparms
,
246 const char *ip_addr
, rpc_authflavor_t authflavour
,
250 extern int nfs_access_cache_shrinker(struct shrinker
*shrink
,
251 struct shrink_control
*sc
);
254 extern struct workqueue_struct
*nfsiod_workqueue
;
255 extern struct inode
*nfs_alloc_inode(struct super_block
*sb
);
256 extern void nfs_destroy_inode(struct inode
*);
257 extern int nfs_write_inode(struct inode
*, struct writeback_control
*);
258 extern void nfs_evict_inode(struct inode
*);
260 extern void nfs4_evict_inode(struct inode
*);
262 void nfs_zap_acl_cache(struct inode
*inode
);
263 extern int nfs_wait_bit_killable(void *word
);
266 extern struct file_system_type nfs_xdev_fs_type
;
268 extern struct file_system_type nfs4_xdev_fs_type
;
269 extern struct file_system_type nfs4_referral_fs_type
;
272 extern struct rpc_stat nfs_rpcstat
;
274 extern int __init
register_nfs_fs(void);
275 extern void __exit
unregister_nfs_fs(void);
276 extern void nfs_sb_active(struct super_block
*sb
);
277 extern void nfs_sb_deactive(struct super_block
*sb
);
280 extern char *nfs_path(char **p
, struct dentry
*dentry
,
281 char *buffer
, ssize_t buflen
);
282 extern struct vfsmount
*nfs_d_automount(struct path
*path
);
284 rpc_authflavor_t
nfs_find_best_sec(struct nfs4_secinfo_flavors
*);
288 extern struct dentry
*nfs_get_root(struct super_block
*, struct nfs_fh
*,
291 extern struct dentry
*nfs4_get_root(struct super_block
*, struct nfs_fh
*,
294 extern int nfs4_get_rootfh(struct nfs_server
*server
, struct nfs_fh
*mntfh
);
297 struct nfs_pageio_descriptor
;
299 extern int nfs_initiate_read(struct nfs_read_data
*data
, struct rpc_clnt
*clnt
,
300 const struct rpc_call_ops
*call_ops
);
301 extern void nfs_read_prepare(struct rpc_task
*task
, void *calldata
);
302 extern int nfs_generic_pagein(struct nfs_pageio_descriptor
*desc
,
303 struct list_head
*head
);
305 extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor
*pgio
,
306 struct inode
*inode
);
307 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor
*pgio
);
308 extern void nfs_readdata_release(struct nfs_read_data
*rdata
);
311 extern int nfs_generic_flush(struct nfs_pageio_descriptor
*desc
,
312 struct list_head
*head
);
313 extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor
*pgio
,
314 struct inode
*inode
, int ioflags
);
315 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor
*pgio
);
316 extern void nfs_writedata_release(struct nfs_write_data
*wdata
);
317 extern void nfs_commit_free(struct nfs_write_data
*p
);
318 extern int nfs_initiate_write(struct nfs_write_data
*data
,
319 struct rpc_clnt
*clnt
,
320 const struct rpc_call_ops
*call_ops
,
322 extern void nfs_write_prepare(struct rpc_task
*task
, void *calldata
);
323 extern int nfs_initiate_commit(struct nfs_write_data
*data
,
324 struct rpc_clnt
*clnt
,
325 const struct rpc_call_ops
*call_ops
,
327 extern void nfs_init_commit(struct nfs_write_data
*data
,
328 struct list_head
*head
,
329 struct pnfs_layout_segment
*lseg
);
330 void nfs_retry_commit(struct list_head
*page_list
,
331 struct pnfs_layout_segment
*lseg
);
332 void nfs_commit_clear_lock(struct nfs_inode
*nfsi
);
333 void nfs_commitdata_release(void *data
);
334 void nfs_commit_release_pages(struct nfs_write_data
*data
);
335 void nfs_request_add_commit_list(struct nfs_page
*req
, struct list_head
*head
);
336 void nfs_request_remove_commit_list(struct nfs_page
*req
);
338 #ifdef CONFIG_MIGRATION
339 extern int nfs_migrate_page(struct address_space
*,
340 struct page
*, struct page
*, enum migrate_mode
);
342 #define nfs_migrate_page NULL
346 extern void __nfs4_read_done_cb(struct nfs_read_data
*);
347 extern void nfs4_reset_read(struct rpc_task
*task
, struct nfs_read_data
*data
);
348 extern int nfs4_init_client(struct nfs_client
*clp
,
349 const struct rpc_timeout
*timeparms
,
351 rpc_authflavor_t authflavour
,
353 extern void nfs4_reset_write(struct rpc_task
*task
, struct nfs_write_data
*data
);
354 extern int _nfs4_call_sync(struct rpc_clnt
*clnt
,
355 struct nfs_server
*server
,
356 struct rpc_message
*msg
,
357 struct nfs4_sequence_args
*args
,
358 struct nfs4_sequence_res
*res
,
360 extern int _nfs4_call_sync_session(struct rpc_clnt
*clnt
,
361 struct nfs_server
*server
,
362 struct rpc_message
*msg
,
363 struct nfs4_sequence_args
*args
,
364 struct nfs4_sequence_res
*res
,
368 * Determine the device name as a string
370 static inline char *nfs_devname(struct dentry
*dentry
,
371 char *buffer
, ssize_t buflen
)
374 return nfs_path(&dummy
, dentry
, buffer
, buflen
);
378 * Determine the actual block size (and log2 thereof)
381 unsigned long nfs_block_bits(unsigned long bsize
, unsigned char *nrbitsp
)
383 /* make sure blocksize is a power of two */
384 if ((bsize
& (bsize
- 1)) || nrbitsp
) {
385 unsigned char nrbits
;
387 for (nrbits
= 31; nrbits
&& !(bsize
& (1 << nrbits
)); nrbits
--)
398 * Calculate the number of 512byte blocks used.
400 static inline blkcnt_t
nfs_calc_block_size(u64 tsize
)
402 blkcnt_t used
= (tsize
+ 511) >> 9;
403 return (used
> ULONG_MAX
) ? ULONG_MAX
: used
;
407 * Compute and set NFS server blocksize
410 unsigned long nfs_block_size(unsigned long bsize
, unsigned char *nrbitsp
)
412 if (bsize
< NFS_MIN_FILE_IO_SIZE
)
413 bsize
= NFS_DEF_FILE_IO_SIZE
;
414 else if (bsize
>= NFS_MAX_FILE_IO_SIZE
)
415 bsize
= NFS_MAX_FILE_IO_SIZE
;
417 return nfs_block_bits(bsize
, nrbitsp
);
421 * Determine the maximum file size for a superblock
424 void nfs_super_set_maxbytes(struct super_block
*sb
, __u64 maxfilesize
)
426 sb
->s_maxbytes
= (loff_t
)maxfilesize
;
427 if (sb
->s_maxbytes
> MAX_LFS_FILESIZE
|| sb
->s_maxbytes
<= 0)
428 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
432 * Determine the number of bytes of data the page contains
435 unsigned int nfs_page_length(struct page
*page
)
437 loff_t i_size
= i_size_read(page
->mapping
->host
);
440 pgoff_t end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
441 if (page
->index
< end_index
)
442 return PAGE_CACHE_SIZE
;
443 if (page
->index
== end_index
)
444 return ((i_size
- 1) & ~PAGE_CACHE_MASK
) + 1;
450 * Convert a umode to a dirent->d_type
453 unsigned char nfs_umode_to_dtype(umode_t mode
)
455 return (mode
>> 12) & 15;
459 * Determine the number of pages in an array of length 'len' and
460 * with a base offset of 'base'
463 unsigned int nfs_page_array_len(unsigned int base
, size_t len
)
465 return ((unsigned long)len
+ (unsigned long)base
+
466 PAGE_SIZE
- 1) >> PAGE_SHIFT
;