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;
51 unsigned short protocol;
55 struct sockaddr_storage address;
60 unsigned short protocol;
63 struct security_mnt_opts lsm_opts;
67 struct nfs_mount_request {
73 unsigned short protocol;
78 extern int nfs_mount(struct nfs_mount_request *info);
81 extern struct rpc_program nfs_program;
83 extern void nfs_put_client(struct nfs_client *);
84 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
85 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
86 extern struct nfs_server *nfs_create_server(
87 const struct nfs_parsed_mount_data *,
89 extern struct nfs_server *nfs4_create_server(
90 const struct nfs_parsed_mount_data *,
92 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
94 extern void nfs_free_server(struct nfs_server *server);
95 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
99 extern int __init nfs_fs_proc_init(void);
100 extern void nfs_fs_proc_exit(void);
102 static inline int nfs_fs_proc_init(void)
106 static inline void nfs_fs_proc_exit(void)
111 /* nfs4namespace.c */
113 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
116 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
118 return ERR_PTR(-ENOENT);
123 extern struct svc_version nfs4_callback_version1;
126 extern int __init nfs_init_nfspagecache(void);
127 extern void nfs_destroy_nfspagecache(void);
128 extern int __init nfs_init_readpagecache(void);
129 extern void nfs_destroy_readpagecache(void);
130 extern int __init nfs_init_writepagecache(void);
131 extern void nfs_destroy_writepagecache(void);
133 extern int __init nfs_init_directcache(void);
134 extern void nfs_destroy_directcache(void);
137 extern int nfs_stat_to_errno(int);
138 extern struct rpc_procinfo nfs_procedures[];
139 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
142 extern struct rpc_procinfo nfs3_procedures[];
143 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
147 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
152 extern struct rpc_procinfo nfs4_procedures[];
156 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
159 extern struct workqueue_struct *nfsiod_workqueue;
160 extern struct inode *nfs_alloc_inode(struct super_block *sb);
161 extern void nfs_destroy_inode(struct inode *);
162 extern int nfs_write_inode(struct inode *,int);
163 extern void nfs_clear_inode(struct inode *);
165 extern void nfs4_clear_inode(struct inode *);
167 void nfs_zap_acl_cache(struct inode *inode);
170 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
171 extern struct file_system_type nfs_xdev_fs_type;
173 extern struct file_system_type nfs4_xdev_fs_type;
174 extern struct file_system_type nfs4_referral_fs_type;
177 extern struct rpc_stat nfs_rpcstat;
179 extern int __init register_nfs_fs(void);
180 extern void __exit unregister_nfs_fs(void);
181 extern void nfs_sb_active(struct super_block *sb);
182 extern void nfs_sb_deactive(struct super_block *sb);
185 extern char *nfs_path(const char *base,
186 const struct dentry *droot,
187 const struct dentry *dentry,
188 char *buffer, ssize_t buflen);
191 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
193 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
195 extern int nfs4_path_walk(struct nfs_server *server,
196 struct nfs_fh *mntfh,
201 * Determine the device name as a string
203 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
204 const struct dentry *dentry,
205 char *buffer, ssize_t buflen)
207 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
208 dentry, buffer, buflen);
212 * Determine the actual block size (and log2 thereof)
215 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
217 /* make sure blocksize is a power of two */
218 if ((bsize & (bsize - 1)) || nrbitsp) {
219 unsigned char nrbits;
221 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
232 * Calculate the number of 512byte blocks used.
234 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
236 blkcnt_t used = (tsize + 511) >> 9;
237 return (used > ULONG_MAX) ? ULONG_MAX : used;
241 * Compute and set NFS server blocksize
244 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
246 if (bsize < NFS_MIN_FILE_IO_SIZE)
247 bsize = NFS_DEF_FILE_IO_SIZE;
248 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
249 bsize = NFS_MAX_FILE_IO_SIZE;
251 return nfs_block_bits(bsize, nrbitsp);
255 * Determine the maximum file size for a superblock
258 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
260 sb->s_maxbytes = (loff_t)maxfilesize;
261 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
262 sb->s_maxbytes = MAX_LFS_FILESIZE;
266 * Determine the number of bytes of data the page contains
269 unsigned int nfs_page_length(struct page *page)
271 loff_t i_size = i_size_read(page->mapping->host);
274 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
275 if (page->index < end_index)
276 return PAGE_CACHE_SIZE;
277 if (page->index == end_index)
278 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
284 * Determine the number of pages in an array of length 'len' and
285 * with a base offset of 'base'
288 unsigned int nfs_page_array_len(unsigned int base, size_t len)
290 return ((unsigned long)len + (unsigned long)base +
291 PAGE_SIZE - 1) >> PAGE_SHIFT;
294 #define IPV6_SCOPE_DELIMITER '%'
297 * Set the port number in an address. Be agnostic about the address
300 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
302 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
303 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
305 switch (sap->sa_family) {
307 ap->sin_port = htons(port);
310 ap6->sin6_port = htons(port);