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_put_client(struct nfs_client
*);
132 extern struct nfs_client
*nfs_find_client(const struct sockaddr
*, u32
);
133 extern struct nfs_client
*nfs_find_client_next(struct nfs_client
*);
134 extern struct nfs_server
*nfs_create_server(
135 const struct nfs_parsed_mount_data
*,
137 extern struct nfs_server
*nfs4_create_server(
138 const struct nfs_parsed_mount_data
*,
140 extern struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*,
142 extern void nfs_free_server(struct nfs_server
*server
);
143 extern struct nfs_server
*nfs_clone_server(struct nfs_server
*,
146 extern void nfs_mark_client_ready(struct nfs_client
*clp
, int state
);
147 extern int nfs4_check_client_ready(struct nfs_client
*clp
);
148 #ifdef CONFIG_PROC_FS
149 extern int __init
nfs_fs_proc_init(void);
150 extern void nfs_fs_proc_exit(void);
152 static inline int nfs_fs_proc_init(void)
156 static inline void nfs_fs_proc_exit(void)
161 /* nfs4namespace.c */
163 extern struct vfsmount
*nfs_do_refmount(const struct vfsmount
*mnt_parent
, struct dentry
*dentry
);
166 struct vfsmount
*nfs_do_refmount(const struct vfsmount
*mnt_parent
, struct dentry
*dentry
)
168 return ERR_PTR(-ENOENT
);
173 extern struct svc_version nfs4_callback_version1
;
174 extern struct svc_version nfs4_callback_version4
;
177 extern int __init
nfs_init_nfspagecache(void);
178 extern void nfs_destroy_nfspagecache(void);
179 extern int __init
nfs_init_readpagecache(void);
180 extern void nfs_destroy_readpagecache(void);
181 extern int __init
nfs_init_writepagecache(void);
182 extern void nfs_destroy_writepagecache(void);
184 extern int __init
nfs_init_directcache(void);
185 extern void nfs_destroy_directcache(void);
188 extern int nfs_stat_to_errno(enum nfs_stat
);
189 extern struct rpc_procinfo nfs_procedures
[];
190 extern int nfs2_decode_dirent(struct xdr_stream
*,
191 struct nfs_entry
*, int);
194 extern struct rpc_procinfo nfs3_procedures
[];
195 extern int nfs3_decode_dirent(struct xdr_stream
*,
196 struct nfs_entry
*, int);
200 extern int nfs4_decode_dirent(struct xdr_stream
*,
201 struct nfs_entry
*, int);
203 #ifdef CONFIG_NFS_V4_1
204 extern const u32 nfs41_maxread_overhead
;
205 extern const u32 nfs41_maxwrite_overhead
;
210 extern struct rpc_procinfo nfs4_procedures
[];
214 void nfs_close_context(struct nfs_open_context
*ctx
, int is_sync
);
217 extern int nfs_access_cache_shrinker(struct shrinker
*shrink
,
218 int nr_to_scan
, gfp_t gfp_mask
);
221 extern struct workqueue_struct
*nfsiod_workqueue
;
222 extern struct inode
*nfs_alloc_inode(struct super_block
*sb
);
223 extern void nfs_destroy_inode(struct inode
*);
224 extern int nfs_write_inode(struct inode
*, struct writeback_control
*);
225 extern void nfs_evict_inode(struct inode
*);
227 extern void nfs4_evict_inode(struct inode
*);
229 void nfs_zap_acl_cache(struct inode
*inode
);
230 extern int nfs_wait_bit_killable(void *word
);
233 extern struct file_system_type nfs_xdev_fs_type
;
235 extern struct file_system_type nfs4_xdev_fs_type
;
236 extern struct file_system_type nfs4_referral_fs_type
;
239 extern struct rpc_stat nfs_rpcstat
;
241 extern int __init
register_nfs_fs(void);
242 extern void __exit
unregister_nfs_fs(void);
243 extern void nfs_sb_active(struct super_block
*sb
);
244 extern void nfs_sb_deactive(struct super_block
*sb
);
247 extern char *nfs_path(const char *base
,
248 const struct dentry
*droot
,
249 const struct dentry
*dentry
,
250 char *buffer
, ssize_t buflen
);
253 extern struct dentry
*nfs_get_root(struct super_block
*, struct nfs_fh
*);
255 extern struct dentry
*nfs4_get_root(struct super_block
*, struct nfs_fh
*);
257 extern int nfs4_get_rootfh(struct nfs_server
*server
, struct nfs_fh
*mntfh
);
261 extern void nfs_read_prepare(struct rpc_task
*task
, void *calldata
);
264 extern void nfs_write_prepare(struct rpc_task
*task
, void *calldata
);
265 #ifdef CONFIG_MIGRATION
266 extern int nfs_migrate_page(struct address_space
*,
267 struct page
*, struct page
*);
269 #define nfs_migrate_page NULL
273 extern int _nfs4_call_sync(struct nfs_server
*server
,
274 struct rpc_message
*msg
,
275 struct nfs4_sequence_args
*args
,
276 struct nfs4_sequence_res
*res
,
278 extern int _nfs4_call_sync_session(struct nfs_server
*server
,
279 struct rpc_message
*msg
,
280 struct nfs4_sequence_args
*args
,
281 struct nfs4_sequence_res
*res
,
285 * Determine the device name as a string
287 static inline char *nfs_devname(const struct vfsmount
*mnt_parent
,
288 const struct dentry
*dentry
,
289 char *buffer
, ssize_t buflen
)
291 return nfs_path(mnt_parent
->mnt_devname
, mnt_parent
->mnt_root
,
292 dentry
, buffer
, buflen
);
296 * Determine the actual block size (and log2 thereof)
299 unsigned long nfs_block_bits(unsigned long bsize
, unsigned char *nrbitsp
)
301 /* make sure blocksize is a power of two */
302 if ((bsize
& (bsize
- 1)) || nrbitsp
) {
303 unsigned char nrbits
;
305 for (nrbits
= 31; nrbits
&& !(bsize
& (1 << nrbits
)); nrbits
--)
316 * Calculate the number of 512byte blocks used.
318 static inline blkcnt_t
nfs_calc_block_size(u64 tsize
)
320 blkcnt_t used
= (tsize
+ 511) >> 9;
321 return (used
> ULONG_MAX
) ? ULONG_MAX
: used
;
325 * Compute and set NFS server blocksize
328 unsigned long nfs_block_size(unsigned long bsize
, unsigned char *nrbitsp
)
330 if (bsize
< NFS_MIN_FILE_IO_SIZE
)
331 bsize
= NFS_DEF_FILE_IO_SIZE
;
332 else if (bsize
>= NFS_MAX_FILE_IO_SIZE
)
333 bsize
= NFS_MAX_FILE_IO_SIZE
;
335 return nfs_block_bits(bsize
, nrbitsp
);
339 * Determine the maximum file size for a superblock
342 void nfs_super_set_maxbytes(struct super_block
*sb
, __u64 maxfilesize
)
344 sb
->s_maxbytes
= (loff_t
)maxfilesize
;
345 if (sb
->s_maxbytes
> MAX_LFS_FILESIZE
|| sb
->s_maxbytes
<= 0)
346 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
350 * Determine the number of bytes of data the page contains
353 unsigned int nfs_page_length(struct page
*page
)
355 loff_t i_size
= i_size_read(page
->mapping
->host
);
358 pgoff_t end_index
= (i_size
- 1) >> PAGE_CACHE_SHIFT
;
359 if (page
->index
< end_index
)
360 return PAGE_CACHE_SIZE
;
361 if (page
->index
== end_index
)
362 return ((i_size
- 1) & ~PAGE_CACHE_MASK
) + 1;
368 * Convert a umode to a dirent->d_type
371 unsigned char nfs_umode_to_dtype(umode_t mode
)
373 return (mode
>> 12) & 15;
377 * Determine the number of pages in an array of length 'len' and
378 * with a base offset of 'base'
381 unsigned int nfs_page_array_len(unsigned int base
, size_t len
)
383 return ((unsigned long)len
+ (unsigned long)base
+
384 PAGE_SIZE
- 1) >> PAGE_SHIFT
;
388 * Helper for restarting RPC calls in the possible presence of NFSv4.1
391 static inline int nfs_restart_rpc(struct rpc_task
*task
, const struct nfs_client
*clp
)
393 if (nfs4_has_session(clp
))
394 return rpc_restart_call_prepare(task
);
395 return rpc_restart_call(task
);