2 * NFS internal definitions
5 #include <linux/mount.h>
9 struct nfs4_mount_data
;
11 /* Maximum number of readahead requests
12 * FIXME: this should really be a sysctl so that users may tune it to suit
13 * their needs. People that do NFS over a slow network, might for
14 * instance want to reduce it to something closer to 1 for improved
15 * interactive response.
17 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
19 struct nfs_clone_mount
{
20 const struct super_block
*sb
;
21 const struct dentry
*dentry
;
23 struct nfs_fattr
*fattr
;
26 struct sockaddr_in
*addr
;
27 rpc_authflavor_t authflavor
;
31 extern struct rpc_program nfs_program
;
33 extern void nfs_put_client(struct nfs_client
*);
34 extern struct nfs_client
*nfs_find_client(const struct sockaddr_in
*, int);
35 extern struct nfs_server
*nfs_create_server(const struct nfs_mount_data
*,
37 extern struct nfs_server
*nfs4_create_server(const struct nfs4_mount_data
*,
39 const struct sockaddr_in
*,
44 extern struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*,
46 extern void nfs_free_server(struct nfs_server
*server
);
47 extern struct nfs_server
*nfs_clone_server(struct nfs_server
*,
53 extern struct vfsmount
*nfs_do_refmount(const struct vfsmount
*mnt_parent
, struct dentry
*dentry
);
56 struct vfsmount
*nfs_do_refmount(const struct vfsmount
*mnt_parent
, struct dentry
*dentry
)
58 return ERR_PTR(-ENOENT
);
63 extern struct svc_version nfs4_callback_version1
;
66 extern int __init
nfs_init_nfspagecache(void);
67 extern void nfs_destroy_nfspagecache(void);
68 extern int __init
nfs_init_readpagecache(void);
69 extern void nfs_destroy_readpagecache(void);
70 extern int __init
nfs_init_writepagecache(void);
71 extern void nfs_destroy_writepagecache(void);
73 #ifdef CONFIG_NFS_DIRECTIO
74 extern int __init
nfs_init_directcache(void);
75 extern void nfs_destroy_directcache(void);
77 #define nfs_init_directcache() (0)
78 #define nfs_destroy_directcache() do {} while(0)
82 extern int nfs_stat_to_errno(int);
83 extern struct rpc_procinfo nfs_procedures
[];
84 extern u32
* nfs_decode_dirent(u32
*, struct nfs_entry
*, int);
87 extern struct rpc_procinfo nfs3_procedures
[];
88 extern u32
*nfs3_decode_dirent(u32
*, struct nfs_entry
*, int);
92 extern u32
*nfs4_decode_dirent(u32
*p
, struct nfs_entry
*entry
, int plus
);
97 extern struct rpc_procinfo nfs4_procedures
[];
99 extern int nfs4_proc_fs_locations(struct inode
*dir
, struct dentry
*dentry
,
100 struct nfs4_fs_locations
*fs_locations
,
105 extern int nfs_access_cache_shrinker(int nr_to_scan
, gfp_t gfp_mask
);
108 extern struct inode
*nfs_alloc_inode(struct super_block
*sb
);
109 extern void nfs_destroy_inode(struct inode
*);
110 extern int nfs_write_inode(struct inode
*,int);
111 extern void nfs_clear_inode(struct inode
*);
113 extern void nfs4_clear_inode(struct inode
*);
117 extern struct file_system_type nfs_xdev_fs_type
;
119 extern struct file_system_type nfs4_xdev_fs_type
;
120 extern struct file_system_type nfs4_referral_fs_type
;
123 extern struct rpc_stat nfs_rpcstat
;
125 extern int __init
register_nfs_fs(void);
126 extern void __exit
unregister_nfs_fs(void);
129 extern char *nfs_path(const char *base
,
130 const struct dentry
*droot
,
131 const struct dentry
*dentry
,
132 char *buffer
, ssize_t buflen
);
135 extern struct dentry
*nfs_get_root(struct super_block
*, struct nfs_fh
*);
137 extern struct dentry
*nfs4_get_root(struct super_block
*, struct nfs_fh
*);
139 extern int nfs4_path_walk(struct nfs_server
*server
,
140 struct nfs_fh
*mntfh
,
145 * Determine the device name as a string
147 static inline char *nfs_devname(const struct vfsmount
*mnt_parent
,
148 const struct dentry
*dentry
,
149 char *buffer
, ssize_t buflen
)
151 return nfs_path(mnt_parent
->mnt_devname
, mnt_parent
->mnt_root
,
152 dentry
, buffer
, buflen
);
156 * Determine the actual block size (and log2 thereof)
159 unsigned long nfs_block_bits(unsigned long bsize
, unsigned char *nrbitsp
)
161 /* make sure blocksize is a power of two */
162 if ((bsize
& (bsize
- 1)) || nrbitsp
) {
163 unsigned char nrbits
;
165 for (nrbits
= 31; nrbits
&& !(bsize
& (1 << nrbits
)); nrbits
--)
176 * Calculate the number of 512byte blocks used.
178 static inline unsigned long nfs_calc_block_size(u64 tsize
)
180 loff_t used
= (tsize
+ 511) >> 9;
181 return (used
> ULONG_MAX
) ? ULONG_MAX
: used
;
185 * Compute and set NFS server blocksize
188 unsigned long nfs_block_size(unsigned long bsize
, unsigned char *nrbitsp
)
190 if (bsize
< NFS_MIN_FILE_IO_SIZE
)
191 bsize
= NFS_DEF_FILE_IO_SIZE
;
192 else if (bsize
>= NFS_MAX_FILE_IO_SIZE
)
193 bsize
= NFS_MAX_FILE_IO_SIZE
;
195 return nfs_block_bits(bsize
, nrbitsp
);
199 * Determine the maximum file size for a superblock
202 void nfs_super_set_maxbytes(struct super_block
*sb
, __u64 maxfilesize
)
204 sb
->s_maxbytes
= (loff_t
)maxfilesize
;
205 if (sb
->s_maxbytes
> MAX_LFS_FILESIZE
|| sb
->s_maxbytes
<= 0)
206 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;