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 *,
51 extern int __init nfs_fs_proc_init(void);
52 extern void nfs_fs_proc_exit(void);
54 static inline int nfs_fs_proc_init(void)
58 static inline void nfs_fs_proc_exit(void)
65 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
68 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
70 return ERR_PTR(-ENOENT);
75 extern struct svc_version nfs4_callback_version1;
78 extern int __init nfs_init_nfspagecache(void);
79 extern void nfs_destroy_nfspagecache(void);
80 extern int __init nfs_init_readpagecache(void);
81 extern void nfs_destroy_readpagecache(void);
82 extern int __init nfs_init_writepagecache(void);
83 extern void nfs_destroy_writepagecache(void);
85 #ifdef CONFIG_NFS_DIRECTIO
86 extern int __init nfs_init_directcache(void);
87 extern void nfs_destroy_directcache(void);
89 #define nfs_init_directcache() (0)
90 #define nfs_destroy_directcache() do {} while(0)
94 extern int nfs_stat_to_errno(int);
95 extern struct rpc_procinfo nfs_procedures[];
96 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
99 extern struct rpc_procinfo nfs3_procedures[];
100 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
104 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
109 extern struct rpc_procinfo nfs4_procedures[];
113 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
116 extern struct inode *nfs_alloc_inode(struct super_block *sb);
117 extern void nfs_destroy_inode(struct inode *);
118 extern int nfs_write_inode(struct inode *,int);
119 extern void nfs_clear_inode(struct inode *);
121 extern void nfs4_clear_inode(struct inode *);
125 extern struct file_system_type nfs_xdev_fs_type;
127 extern struct file_system_type nfs4_xdev_fs_type;
128 extern struct file_system_type nfs4_referral_fs_type;
131 extern struct rpc_stat nfs_rpcstat;
133 extern int __init register_nfs_fs(void);
134 extern void __exit unregister_nfs_fs(void);
137 extern char *nfs_path(const char *base,
138 const struct dentry *droot,
139 const struct dentry *dentry,
140 char *buffer, ssize_t buflen);
143 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
145 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
147 extern int nfs4_path_walk(struct nfs_server *server,
148 struct nfs_fh *mntfh,
153 * Determine the device name as a string
155 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
156 const struct dentry *dentry,
157 char *buffer, ssize_t buflen)
159 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
160 dentry, buffer, buflen);
164 * Determine the actual block size (and log2 thereof)
167 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
169 /* make sure blocksize is a power of two */
170 if ((bsize & (bsize - 1)) || nrbitsp) {
171 unsigned char nrbits;
173 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
184 * Calculate the number of 512byte blocks used.
186 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
188 blkcnt_t used = (tsize + 511) >> 9;
189 return (used > ULONG_MAX) ? ULONG_MAX : used;
193 * Compute and set NFS server blocksize
196 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
198 if (bsize < NFS_MIN_FILE_IO_SIZE)
199 bsize = NFS_DEF_FILE_IO_SIZE;
200 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
201 bsize = NFS_MAX_FILE_IO_SIZE;
203 return nfs_block_bits(bsize, nrbitsp);
207 * Determine the maximum file size for a superblock
210 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
212 sb->s_maxbytes = (loff_t)maxfilesize;
213 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
214 sb->s_maxbytes = MAX_LFS_FILESIZE;
218 * Determine the number of bytes of data the page contains
221 unsigned int nfs_page_length(struct page *page)
223 loff_t i_size = i_size_read(page->mapping->host);
226 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
227 if (page->index < end_index)
228 return PAGE_CACHE_SIZE;
229 if (page->index == end_index)
230 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
236 * Determine the number of pages in an array of length 'len' and
237 * with a base offset of 'base'
240 unsigned int nfs_page_array_len(unsigned int base, size_t len)
242 return ((unsigned long)len + (unsigned long)base +
243 PAGE_SIZE - 1) >> PAGE_SHIFT;