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 struct nfs_clone_mount
{
43 const struct super_block
*sb
;
44 const struct dentry
*dentry
;
46 struct nfs_fattr
*fattr
;
49 struct sockaddr
*addr
;
51 rpc_authflavor_t authflavor
;
55 * Note: RFC 1813 doesn't limit the number of auth flavors that
56 * a server can return, so make something up.
58 #define NFS_MAX_SECFLAVORS (12)
61 * Value used if the user did not specify a port value.
63 #define NFS_UNSPEC_PORT (-1)
66 * Maximum number of pages that readdir can use for creating
67 * a vmapped array of pages.
69 #define NFS_MAX_READDIR_PAGES 8
72 * In-kernel mount arguments
74 struct nfs_parsed_mount_data
{
78 int acregmin
, acregmax
,
83 unsigned int auth_flavor_len
;
84 rpc_authflavor_t auth_flavors
[1];
87 unsigned int minorversion
;
91 struct sockaddr_storage address
;
96 unsigned short protocol
;
100 struct sockaddr_storage address
;
105 unsigned short protocol
;
108 struct security_mnt_opts lsm_opts
;
112 struct nfs_mount_request
{
113 struct sockaddr
*sap
;
118 unsigned short protocol
;
121 unsigned int *auth_flav_len
;
122 rpc_authflavor_t
*auth_flavs
;
125 extern int nfs_mount(struct nfs_mount_request
*info
);
126 extern void nfs_umount(const struct nfs_mount_request
*info
);
129 extern struct rpc_program nfs_program
;
131 extern void nfs_cleanup_cb_ident_idr(void);
132 extern void nfs_put_client(struct nfs_client
*);
133 extern struct nfs_client
*nfs4_find_client_no_ident(const struct sockaddr
*);
134 extern struct nfs_client
*nfs4_find_client_ident(int);
135 extern struct nfs_client
*
136 nfs4_find_client_sessionid(const struct sockaddr
*, struct nfs4_sessionid
*);
137 extern struct nfs_server
*nfs_create_server(
138 const struct nfs_parsed_mount_data
*,
140 extern struct nfs_server
*nfs4_create_server(
141 const struct nfs_parsed_mount_data
*,
143 extern struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*,
145 extern void nfs_free_server(struct nfs_server
*server
);
146 extern struct nfs_server
*nfs_clone_server(struct nfs_server
*,
149 extern void nfs_mark_client_ready(struct nfs_client
*clp
, int state
);
150 extern int nfs4_check_client_ready(struct nfs_client
*clp
);
151 extern struct nfs_client
*nfs4_set_ds_client(struct nfs_client
* mds_clp
,
152 const struct sockaddr
*ds_addr
,
153 int ds_addrlen
, int ds_proto
);
154 #ifdef CONFIG_PROC_FS
155 extern int __init
nfs_fs_proc_init(void);
156 extern void nfs_fs_proc_exit(void);
158 static inline int nfs_fs_proc_init(void)
162 static inline void nfs_fs_proc_exit(void)
167 /* nfs4namespace.c */
169 extern struct vfsmount
*nfs_do_refmount(struct dentry
*dentry
);
172 struct vfsmount
*nfs_do_refmount(struct dentry
*dentry
)
174 return ERR_PTR(-ENOENT
);
179 extern struct svc_version nfs4_callback_version1
;
180 extern struct svc_version nfs4_callback_version4
;
183 extern int __init
nfs_init_nfspagecache(void);
184 extern void nfs_destroy_nfspagecache(void);
185 extern int __init
nfs_init_readpagecache(void);
186 extern void nfs_destroy_readpagecache(void);
187 extern int __init
nfs_init_writepagecache(void);
188 extern void nfs_destroy_writepagecache(void);
190 extern int __init
nfs_init_directcache(void);
191 extern void nfs_destroy_directcache(void);
194 extern int nfs_stat_to_errno(enum nfs_stat
);
195 extern struct rpc_procinfo nfs_procedures
[];
196 extern int nfs2_decode_dirent(struct xdr_stream
*,
197 struct nfs_entry
*, int);
200 extern struct rpc_procinfo nfs3_procedures
[];
201 extern int nfs3_decode_dirent(struct xdr_stream
*,
202 struct nfs_entry
*, int);
206 extern int nfs4_decode_dirent(struct xdr_stream
*,
207 struct nfs_entry
*, int);
209 #ifdef CONFIG_NFS_V4_1
210 extern const u32 nfs41_maxread_overhead
;
211 extern const u32 nfs41_maxwrite_overhead
;
216 extern struct rpc_procinfo nfs4_procedures
[];
219 extern int nfs4_init_ds_session(struct nfs_client
*clp
);
222 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
);
223 extern int nfs_init_client(struct nfs_client
*clp
,
224 const struct rpc_timeout
*timeparms
,
225 const char *ip_addr
, rpc_authflavor_t authflavour
,
229 extern int nfs_access_cache_shrinker(struct shrinker
*shrink
,
230 int nr_to_scan
, gfp_t gfp_mask
);
233 extern struct workqueue_struct
*nfsiod_workqueue
;
234 extern struct inode
*nfs_alloc_inode(struct super_block
*sb
);
235 extern void nfs_destroy_inode(struct inode
*);
236 extern int nfs_write_inode(struct inode
*, struct writeback_control
*);
237 extern void nfs_evict_inode(struct inode
*);
239 extern void nfs4_evict_inode(struct inode
*);
241 void nfs_zap_acl_cache(struct inode
*inode
);
242 extern int nfs_wait_bit_killable(void *word
);
245 extern struct file_system_type nfs_xdev_fs_type
;
247 extern struct file_system_type nfs4_xdev_fs_type
;
248 extern struct file_system_type nfs4_referral_fs_type
;
251 extern struct rpc_stat nfs_rpcstat
;
253 extern int __init
register_nfs_fs(void);
254 extern void __exit
unregister_nfs_fs(void);
255 extern void nfs_sb_active(struct super_block
*sb
);
256 extern void nfs_sb_deactive(struct super_block
*sb
);
259 extern char *nfs_path(char **p
, struct dentry
*dentry
,
260 char *buffer
, ssize_t buflen
);
261 extern struct vfsmount
*nfs_d_automount(struct path
*path
);
264 extern struct dentry
*nfs_get_root(struct super_block
*, struct nfs_fh
*,
267 extern struct dentry
*nfs4_get_root(struct super_block
*, struct nfs_fh
*,
270 extern int nfs4_get_rootfh(struct nfs_server
*server
, struct nfs_fh
*mntfh
);
274 extern int nfs_initiate_read(struct nfs_read_data
*data
, struct rpc_clnt
*clnt
,
275 const struct rpc_call_ops
*call_ops
);
276 extern void nfs_read_prepare(struct rpc_task
*task
, void *calldata
);
279 extern int nfs_initiate_write(struct nfs_write_data
*data
,
280 struct rpc_clnt
*clnt
,
281 const struct rpc_call_ops
*call_ops
,
283 extern void nfs_write_prepare(struct rpc_task
*task
, void *calldata
);
284 #ifdef CONFIG_MIGRATION
285 extern int nfs_migrate_page(struct address_space
*,
286 struct page
*, struct page
*);
288 #define nfs_migrate_page NULL
292 extern void nfs4_reset_read(struct rpc_task
*task
, struct nfs_read_data
*data
);
293 extern int nfs4_init_client(struct nfs_client
*clp
,
294 const struct rpc_timeout
*timeparms
,
296 rpc_authflavor_t authflavour
,
298 extern void nfs4_reset_write(struct rpc_task
*task
, struct nfs_write_data
*data
);
299 extern int _nfs4_call_sync(struct nfs_server
*server
,
300 struct rpc_message
*msg
,
301 struct nfs4_sequence_args
*args
,
302 struct nfs4_sequence_res
*res
,
304 extern int _nfs4_call_sync_session(struct nfs_server
*server
,
305 struct rpc_message
*msg
,
306 struct nfs4_sequence_args
*args
,
307 struct nfs4_sequence_res
*res
,
311 * Determine the device name as a string
313 static inline char *nfs_devname(struct dentry
*dentry
,
314 char *buffer
, ssize_t buflen
)
317 return nfs_path(&dummy
, dentry
, buffer
, buflen
);
321 * Determine the actual block size (and log2 thereof)
324 unsigned long nfs_block_bits(unsigned long bsize
, unsigned char *nrbitsp
)
326 /* make sure blocksize is a power of two */
327 if ((bsize
& (bsize
- 1)) || nrbitsp
) {
328 unsigned char nrbits
;
330 for (nrbits
= 31; nrbits
&& !(bsize
& (1 << nrbits
)); nrbits
--)
341 * Calculate the number of 512byte blocks used.
343 static inline blkcnt_t
nfs_calc_block_size(u64 tsize
)
345 blkcnt_t used
= (tsize
+ 511) >> 9;
346 return (used
> ULONG_MAX
) ? ULONG_MAX
: used
;
350 * Compute and set NFS server blocksize
353 unsigned long nfs_block_size(unsigned long bsize
, unsigned char *nrbitsp
)
355 if (bsize
< NFS_MIN_FILE_IO_SIZE
)
356 bsize
= NFS_DEF_FILE_IO_SIZE
;
357 else if (bsize
>= NFS_MAX_FILE_IO_SIZE
)
358 bsize
= NFS_MAX_FILE_IO_SIZE
;
360 return nfs_block_bits(bsize
, nrbitsp
);
364 * Determine the maximum file size for a superblock
367 void nfs_super_set_maxbytes(struct super_block
*sb
, __u64 maxfilesize
)
369 sb
->s_maxbytes
= (loff_t
)maxfilesize
;
370 if (sb
->s_maxbytes
> MAX_LFS_FILESIZE
|| sb
->s_maxbytes
<= 0)
371 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
375 * Determine the number of bytes of data the page contains
378 unsigned int nfs_page_length(struct page
*page
)
380 loff_t i_size
= i_size_read(page
->mapping
->host
);
383 pgoff_t end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
384 if (page
->index
< end_index
)
385 return PAGE_CACHE_SIZE
;
386 if (page
->index
== end_index
)
387 return ((i_size
- 1) & ~PAGE_CACHE_MASK
) + 1;
393 * Convert a umode to a dirent->d_type
396 unsigned char nfs_umode_to_dtype(umode_t mode
)
398 return (mode
>> 12) & 15;
402 * Determine the number of pages in an array of length 'len' and
403 * with a base offset of 'base'
406 unsigned int nfs_page_array_len(unsigned int base
, size_t len
)
408 return ((unsigned long)len
+ (unsigned long)base
+
409 PAGE_SIZE
- 1) >> PAGE_SHIFT
;
413 * Helper for restarting RPC calls in the possible presence of NFSv4.1
416 static inline int nfs_restart_rpc(struct rpc_task
*task
, const struct nfs_client
*clp
)
418 if (nfs4_has_session(clp
))
419 return rpc_restart_call_prepare(task
);
420 return rpc_restart_call(task
);