2 * NFS internal definitions
5 #include <linux/mount.h>
6 #include <linux/security.h>
10 /* Maximum number of readahead requests
11 * FIXME: this should really be a sysctl so that users may tune it to suit
12 * their needs. People that do NFS over a slow network, might for
13 * instance want to reduce it to something closer to 1 for improved
14 * interactive response.
16 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
18 struct nfs_clone_mount {
19 const struct super_block *sb;
20 const struct dentry *dentry;
22 struct nfs_fattr *fattr;
25 struct sockaddr *addr;
27 rpc_authflavor_t authflavor;
31 * In-kernel mount arguments
33 struct nfs_parsed_mount_data {
37 int acregmin, acregmax,
41 unsigned int auth_flavor_len;
42 rpc_authflavor_t auth_flavors[1];
46 struct sockaddr_storage address;
55 struct sockaddr_storage address;
62 struct security_mnt_opts lsm_opts;
66 extern struct rpc_program nfs_program;
68 extern void nfs_put_client(struct nfs_client *);
69 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
70 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
71 extern struct nfs_server *nfs_create_server(
72 const struct nfs_parsed_mount_data *,
74 extern struct nfs_server *nfs4_create_server(
75 const struct nfs_parsed_mount_data *,
77 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
79 extern void nfs_free_server(struct nfs_server *server);
80 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
84 extern int __init nfs_fs_proc_init(void);
85 extern void nfs_fs_proc_exit(void);
87 static inline int nfs_fs_proc_init(void)
91 static inline void nfs_fs_proc_exit(void)
98 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
101 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
103 return ERR_PTR(-ENOENT);
108 extern struct svc_version nfs4_callback_version1;
111 extern int __init nfs_init_nfspagecache(void);
112 extern void nfs_destroy_nfspagecache(void);
113 extern int __init nfs_init_readpagecache(void);
114 extern void nfs_destroy_readpagecache(void);
115 extern int __init nfs_init_writepagecache(void);
116 extern void nfs_destroy_writepagecache(void);
118 #ifdef CONFIG_NFS_DIRECTIO
119 extern int __init nfs_init_directcache(void);
120 extern void nfs_destroy_directcache(void);
122 #define nfs_init_directcache() (0)
123 #define nfs_destroy_directcache() do {} while(0)
127 extern int nfs_stat_to_errno(int);
128 extern struct rpc_procinfo nfs_procedures[];
129 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
132 extern struct rpc_procinfo nfs3_procedures[];
133 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
137 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
142 extern struct rpc_procinfo nfs4_procedures[];
146 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
149 extern struct inode *nfs_alloc_inode(struct super_block *sb);
150 extern void nfs_destroy_inode(struct inode *);
151 extern int nfs_write_inode(struct inode *,int);
152 extern void nfs_clear_inode(struct inode *);
154 extern void nfs4_clear_inode(struct inode *);
158 extern struct file_system_type nfs_xdev_fs_type;
160 extern struct file_system_type nfs4_xdev_fs_type;
161 extern struct file_system_type nfs4_referral_fs_type;
164 extern struct rpc_stat nfs_rpcstat;
166 extern int __init register_nfs_fs(void);
167 extern void __exit unregister_nfs_fs(void);
168 extern void nfs_sb_active(struct nfs_server *server);
169 extern void nfs_sb_deactive(struct nfs_server *server);
172 extern char *nfs_path(const char *base,
173 const struct dentry *droot,
174 const struct dentry *dentry,
175 char *buffer, ssize_t buflen);
178 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
180 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
182 extern int nfs4_path_walk(struct nfs_server *server,
183 struct nfs_fh *mntfh,
188 * Determine the device name as a string
190 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
191 const struct dentry *dentry,
192 char *buffer, ssize_t buflen)
194 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
195 dentry, buffer, buflen);
199 * Determine the actual block size (and log2 thereof)
202 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
204 /* make sure blocksize is a power of two */
205 if ((bsize & (bsize - 1)) || nrbitsp) {
206 unsigned char nrbits;
208 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
219 * Calculate the number of 512byte blocks used.
221 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
223 blkcnt_t used = (tsize + 511) >> 9;
224 return (used > ULONG_MAX) ? ULONG_MAX : used;
228 * Compute and set NFS server blocksize
231 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
233 if (bsize < NFS_MIN_FILE_IO_SIZE)
234 bsize = NFS_DEF_FILE_IO_SIZE;
235 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
236 bsize = NFS_MAX_FILE_IO_SIZE;
238 return nfs_block_bits(bsize, nrbitsp);
242 * Determine the maximum file size for a superblock
245 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
247 sb->s_maxbytes = (loff_t)maxfilesize;
248 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
249 sb->s_maxbytes = MAX_LFS_FILESIZE;
253 * Determine the number of bytes of data the page contains
256 unsigned int nfs_page_length(struct page *page)
258 loff_t i_size = i_size_read(page->mapping->host);
261 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
262 if (page->index < end_index)
263 return PAGE_CACHE_SIZE;
264 if (page->index == end_index)
265 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
271 * Determine the number of pages in an array of length 'len' and
272 * with a base offset of 'base'
275 unsigned int nfs_page_array_len(unsigned int base, size_t len)
277 return ((unsigned long)len + (unsigned long)base +
278 PAGE_SIZE - 1) >> PAGE_SHIFT;