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_in *addr;
25 rpc_authflavor_t authflavor;
29 * In-kernel mount arguments
31 struct nfs_parsed_mount_data {
35 int acregmin, acregmax,
39 unsigned int auth_flavor_len;
40 rpc_authflavor_t auth_flavors[1];
44 struct sockaddr_in address;
53 struct sockaddr_in address;
62 extern struct rpc_program nfs_program;
64 extern void nfs_put_client(struct nfs_client *);
65 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
66 extern struct nfs_server *nfs_create_server(
67 const struct nfs_parsed_mount_data *,
69 extern struct nfs_server *nfs4_create_server(
70 const struct nfs_parsed_mount_data *,
72 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
74 extern void nfs_free_server(struct nfs_server *server);
75 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
79 extern int __init nfs_fs_proc_init(void);
80 extern void nfs_fs_proc_exit(void);
82 static inline int nfs_fs_proc_init(void)
86 static inline void nfs_fs_proc_exit(void)
93 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
96 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
98 return ERR_PTR(-ENOENT);
103 extern struct svc_version nfs4_callback_version1;
106 extern int __init nfs_init_nfspagecache(void);
107 extern void nfs_destroy_nfspagecache(void);
108 extern int __init nfs_init_readpagecache(void);
109 extern void nfs_destroy_readpagecache(void);
110 extern int __init nfs_init_writepagecache(void);
111 extern void nfs_destroy_writepagecache(void);
113 #ifdef CONFIG_NFS_DIRECTIO
114 extern int __init nfs_init_directcache(void);
115 extern void nfs_destroy_directcache(void);
117 #define nfs_init_directcache() (0)
118 #define nfs_destroy_directcache() do {} while(0)
122 extern int nfs_stat_to_errno(int);
123 extern struct rpc_procinfo nfs_procedures[];
124 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
127 extern struct rpc_procinfo nfs3_procedures[];
128 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
132 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
137 extern struct rpc_procinfo nfs4_procedures[];
141 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
144 extern struct inode *nfs_alloc_inode(struct super_block *sb);
145 extern void nfs_destroy_inode(struct inode *);
146 extern int nfs_write_inode(struct inode *,int);
147 extern void nfs_clear_inode(struct inode *);
149 extern void nfs4_clear_inode(struct inode *);
153 extern struct file_system_type nfs_xdev_fs_type;
155 extern struct file_system_type nfs4_xdev_fs_type;
156 extern struct file_system_type nfs4_referral_fs_type;
159 extern struct rpc_stat nfs_rpcstat;
161 extern int __init register_nfs_fs(void);
162 extern void __exit unregister_nfs_fs(void);
165 extern char *nfs_path(const char *base,
166 const struct dentry *droot,
167 const struct dentry *dentry,
168 char *buffer, ssize_t buflen);
171 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
173 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
175 extern int nfs4_path_walk(struct nfs_server *server,
176 struct nfs_fh *mntfh,
181 * Determine the device name as a string
183 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
184 const struct dentry *dentry,
185 char *buffer, ssize_t buflen)
187 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
188 dentry, buffer, buflen);
192 * Determine the actual block size (and log2 thereof)
195 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
197 /* make sure blocksize is a power of two */
198 if ((bsize & (bsize - 1)) || nrbitsp) {
199 unsigned char nrbits;
201 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
212 * Calculate the number of 512byte blocks used.
214 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
216 blkcnt_t used = (tsize + 511) >> 9;
217 return (used > ULONG_MAX) ? ULONG_MAX : used;
221 * Compute and set NFS server blocksize
224 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
226 if (bsize < NFS_MIN_FILE_IO_SIZE)
227 bsize = NFS_DEF_FILE_IO_SIZE;
228 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
229 bsize = NFS_MAX_FILE_IO_SIZE;
231 return nfs_block_bits(bsize, nrbitsp);
235 * Determine the maximum file size for a superblock
238 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
240 sb->s_maxbytes = (loff_t)maxfilesize;
241 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
242 sb->s_maxbytes = MAX_LFS_FILESIZE;
246 * Determine the number of bytes of data the page contains
249 unsigned int nfs_page_length(struct page *page)
251 loff_t i_size = i_size_read(page->mapping->host);
254 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
255 if (page->index < end_index)
256 return PAGE_CACHE_SIZE;
257 if (page->index == end_index)
258 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
264 * Determine the number of pages in an array of length 'len' and
265 * with a base offset of 'base'
268 unsigned int nfs_page_array_len(unsigned int base, size_t len)
270 return ((unsigned long)len + (unsigned long)base +
271 PAGE_SIZE - 1) >> PAGE_SHIFT;