2 * NFS internal definitions
5 #include <linux/mount.h>
9 /* Maximum number of readahead requests
10 * FIXME: this should really be a sysctl so that users may tune it to suit
11 * their needs. People that do NFS over a slow network, might for
12 * instance want to reduce it to something closer to 1 for improved
13 * interactive response.
15 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
17 struct nfs_clone_mount {
18 const struct super_block *sb;
19 const struct dentry *dentry;
21 struct nfs_fattr *fattr;
24 struct sockaddr *addr;
26 rpc_authflavor_t authflavor;
30 * In-kernel mount arguments
32 struct nfs_parsed_mount_data {
36 int acregmin, acregmax,
40 unsigned int auth_flavor_len;
41 rpc_authflavor_t auth_flavors[1];
45 struct sockaddr_storage address;
54 struct sockaddr_storage address;
63 extern struct rpc_program nfs_program;
65 extern void nfs_put_client(struct nfs_client *);
66 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
67 extern struct nfs_server *nfs_create_server(
68 const struct nfs_parsed_mount_data *,
70 extern struct nfs_server *nfs4_create_server(
71 const struct nfs_parsed_mount_data *,
73 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
75 extern void nfs_free_server(struct nfs_server *server);
76 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
80 extern int __init nfs_fs_proc_init(void);
81 extern void nfs_fs_proc_exit(void);
83 static inline int nfs_fs_proc_init(void)
87 static inline void nfs_fs_proc_exit(void)
94 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
97 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
99 return ERR_PTR(-ENOENT);
104 extern struct svc_version nfs4_callback_version1;
107 extern int __init nfs_init_nfspagecache(void);
108 extern void nfs_destroy_nfspagecache(void);
109 extern int __init nfs_init_readpagecache(void);
110 extern void nfs_destroy_readpagecache(void);
111 extern int __init nfs_init_writepagecache(void);
112 extern void nfs_destroy_writepagecache(void);
114 #ifdef CONFIG_NFS_DIRECTIO
115 extern int __init nfs_init_directcache(void);
116 extern void nfs_destroy_directcache(void);
118 #define nfs_init_directcache() (0)
119 #define nfs_destroy_directcache() do {} while(0)
123 extern int nfs_stat_to_errno(int);
124 extern struct rpc_procinfo nfs_procedures[];
125 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
128 extern struct rpc_procinfo nfs3_procedures[];
129 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
133 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
138 extern struct rpc_procinfo nfs4_procedures[];
142 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
145 extern struct inode *nfs_alloc_inode(struct super_block *sb);
146 extern void nfs_destroy_inode(struct inode *);
147 extern int nfs_write_inode(struct inode *,int);
148 extern void nfs_clear_inode(struct inode *);
150 extern void nfs4_clear_inode(struct inode *);
154 extern struct file_system_type nfs_xdev_fs_type;
156 extern struct file_system_type nfs4_xdev_fs_type;
157 extern struct file_system_type nfs4_referral_fs_type;
160 extern struct rpc_stat nfs_rpcstat;
162 extern int __init register_nfs_fs(void);
163 extern void __exit unregister_nfs_fs(void);
164 extern void nfs_sb_active(struct nfs_server *server);
165 extern void nfs_sb_deactive(struct nfs_server *server);
168 extern char *nfs_path(const char *base,
169 const struct dentry *droot,
170 const struct dentry *dentry,
171 char *buffer, ssize_t buflen);
174 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
176 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
178 extern int nfs4_path_walk(struct nfs_server *server,
179 struct nfs_fh *mntfh,
184 * Determine the device name as a string
186 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
187 const struct dentry *dentry,
188 char *buffer, ssize_t buflen)
190 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
191 dentry, buffer, buflen);
195 * Determine the actual block size (and log2 thereof)
198 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
200 /* make sure blocksize is a power of two */
201 if ((bsize & (bsize - 1)) || nrbitsp) {
202 unsigned char nrbits;
204 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
215 * Calculate the number of 512byte blocks used.
217 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
219 blkcnt_t used = (tsize + 511) >> 9;
220 return (used > ULONG_MAX) ? ULONG_MAX : used;
224 * Compute and set NFS server blocksize
227 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
229 if (bsize < NFS_MIN_FILE_IO_SIZE)
230 bsize = NFS_DEF_FILE_IO_SIZE;
231 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
232 bsize = NFS_MAX_FILE_IO_SIZE;
234 return nfs_block_bits(bsize, nrbitsp);
238 * Determine the maximum file size for a superblock
241 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
243 sb->s_maxbytes = (loff_t)maxfilesize;
244 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
245 sb->s_maxbytes = MAX_LFS_FILESIZE;
249 * Determine the number of bytes of data the page contains
252 unsigned int nfs_page_length(struct page *page)
254 loff_t i_size = i_size_read(page->mapping->host);
257 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
258 if (page->index < end_index)
259 return PAGE_CACHE_SIZE;
260 if (page->index == end_index)
261 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
267 * Determine the number of pages in an array of length 'len' and
268 * with a base offset of 'base'
271 unsigned int nfs_page_array_len(unsigned int base, size_t len)
273 return ((unsigned long)len + (unsigned long)base +
274 PAGE_SIZE - 1) >> PAGE_SHIFT;