1 /* 2 * NFS internal definitions 3 */ 4 5 #include <linux/mount.h> 6 #include <linux/security.h> 7 8 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 9 10 struct nfs_string; 11 12 /* Maximum number of readahead requests 13 * FIXME: this should really be a sysctl so that users may tune it to suit 14 * their needs. People that do NFS over a slow network, might for 15 * instance want to reduce it to something closer to 1 for improved 16 * interactive response. 17 */ 18 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 19 20 struct nfs_clone_mount { 21 const struct super_block *sb; 22 const struct dentry *dentry; 23 struct nfs_fh *fh; 24 struct nfs_fattr *fattr; 25 char *hostname; 26 char *mnt_path; 27 struct sockaddr *addr; 28 size_t addrlen; 29 rpc_authflavor_t authflavor; 30 }; 31 32 /* 33 * In-kernel mount arguments 34 */ 35 struct nfs_parsed_mount_data { 36 int flags; 37 int rsize, wsize; 38 int timeo, retrans; 39 int acregmin, acregmax, 40 acdirmin, acdirmax; 41 int namlen; 42 unsigned int options; 43 unsigned int bsize; 44 unsigned int auth_flavor_len; 45 rpc_authflavor_t auth_flavors[1]; 46 char *client_address; 47 unsigned int minorversion; 48 char *fscache_uniq; 49 50 struct { 51 struct sockaddr_storage address; 52 size_t addrlen; 53 char *hostname; 54 u32 version; 55 unsigned short port; 56 unsigned short protocol; 57 } mount_server; 58 59 struct { 60 struct sockaddr_storage address; 61 size_t addrlen; 62 char *hostname; 63 char *export_path; 64 unsigned short port; 65 unsigned short protocol; 66 } nfs_server; 67 68 struct security_mnt_opts lsm_opts; 69 }; 70 71 /* mount_clnt.c */ 72 struct nfs_mount_request { 73 struct sockaddr *sap; 74 size_t salen; 75 char *hostname; 76 char *dirpath; 77 u32 version; 78 unsigned short protocol; 79 struct nfs_fh *fh; 80 int noresvport; 81 }; 82 83 extern int nfs_mount(struct nfs_mount_request *info); 84 85 /* client.c */ 86 extern struct rpc_program nfs_program; 87 88 extern void nfs_put_client(struct nfs_client *); 89 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 90 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 91 extern struct nfs_server *nfs_create_server( 92 const struct nfs_parsed_mount_data *, 93 struct nfs_fh *); 94 extern struct nfs_server *nfs4_create_server( 95 const struct nfs_parsed_mount_data *, 96 struct nfs_fh *); 97 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 98 struct nfs_fh *); 99 extern void nfs_free_server(struct nfs_server *server); 100 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 101 struct nfs_fh *, 102 struct nfs_fattr *); 103 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 104 #ifdef CONFIG_PROC_FS 105 extern int __init nfs_fs_proc_init(void); 106 extern void nfs_fs_proc_exit(void); 107 #else 108 static inline int nfs_fs_proc_init(void) 109 { 110 return 0; 111 } 112 static inline void nfs_fs_proc_exit(void) 113 { 114 } 115 #endif 116 117 /* nfs4namespace.c */ 118 #ifdef CONFIG_NFS_V4 119 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 120 #else 121 static inline 122 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 123 { 124 return ERR_PTR(-ENOENT); 125 } 126 #endif 127 128 /* callback_xdr.c */ 129 extern struct svc_version nfs4_callback_version1; 130 131 /* pagelist.c */ 132 extern int __init nfs_init_nfspagecache(void); 133 extern void nfs_destroy_nfspagecache(void); 134 extern int __init nfs_init_readpagecache(void); 135 extern void nfs_destroy_readpagecache(void); 136 extern int __init nfs_init_writepagecache(void); 137 extern void nfs_destroy_writepagecache(void); 138 139 extern int __init nfs_init_directcache(void); 140 extern void nfs_destroy_directcache(void); 141 142 /* nfs2xdr.c */ 143 extern int nfs_stat_to_errno(int); 144 extern struct rpc_procinfo nfs_procedures[]; 145 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 146 147 /* nfs3xdr.c */ 148 extern struct rpc_procinfo nfs3_procedures[]; 149 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 150 151 /* nfs4xdr.c */ 152 #ifdef CONFIG_NFS_V4 153 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 154 #endif 155 156 /* nfs4proc.c */ 157 #ifdef CONFIG_NFS_V4 158 extern struct rpc_procinfo nfs4_procedures[]; 159 #endif 160 161 /* proc.c */ 162 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 163 164 /* dir.c */ 165 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 166 167 /* inode.c */ 168 extern struct workqueue_struct *nfsiod_workqueue; 169 extern struct inode *nfs_alloc_inode(struct super_block *sb); 170 extern void nfs_destroy_inode(struct inode *); 171 extern int nfs_write_inode(struct inode *,int); 172 extern void nfs_clear_inode(struct inode *); 173 #ifdef CONFIG_NFS_V4 174 extern void nfs4_clear_inode(struct inode *); 175 #endif 176 void nfs_zap_acl_cache(struct inode *inode); 177 extern int nfs_wait_bit_killable(void *word); 178 179 /* super.c */ 180 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *); 181 extern struct file_system_type nfs_xdev_fs_type; 182 #ifdef CONFIG_NFS_V4 183 extern struct file_system_type nfs4_xdev_fs_type; 184 extern struct file_system_type nfs4_referral_fs_type; 185 #endif 186 187 extern struct rpc_stat nfs_rpcstat; 188 189 extern int __init register_nfs_fs(void); 190 extern void __exit unregister_nfs_fs(void); 191 extern void nfs_sb_active(struct super_block *sb); 192 extern void nfs_sb_deactive(struct super_block *sb); 193 194 /* namespace.c */ 195 extern char *nfs_path(const char *base, 196 const struct dentry *droot, 197 const struct dentry *dentry, 198 char *buffer, ssize_t buflen); 199 200 /* getroot.c */ 201 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 202 #ifdef CONFIG_NFS_V4 203 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 204 205 extern int nfs4_path_walk(struct nfs_server *server, 206 struct nfs_fh *mntfh, 207 const char *path); 208 #endif 209 210 /* read.c */ 211 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 212 213 /* write.c */ 214 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 215 216 /* nfs4proc.c */ 217 extern int _nfs4_call_sync(struct nfs_server *server, 218 struct rpc_message *msg, 219 struct nfs4_sequence_args *args, 220 struct nfs4_sequence_res *res, 221 int cache_reply); 222 extern int _nfs4_call_sync_session(struct nfs_server *server, 223 struct rpc_message *msg, 224 struct nfs4_sequence_args *args, 225 struct nfs4_sequence_res *res, 226 int cache_reply); 227 228 /* 229 * Determine if sessions are in use. 230 */ 231 static inline int nfs4_has_session(const struct nfs_client *clp) 232 { 233 #ifdef CONFIG_NFS_V4_1 234 if (clp->cl_session) 235 return 1; 236 #endif /* CONFIG_NFS_V4_1 */ 237 return 0; 238 } 239 240 #ifdef CONFIG_NFS_V4_1 241 extern void nfs41_sequence_free_slot(const struct nfs_client *, 242 struct nfs4_sequence_res *res); 243 #endif /* CONFIG_NFS_V4_1 */ 244 245 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 246 struct nfs4_sequence_res *res) 247 { 248 #ifdef CONFIG_NFS_V4_1 249 if (nfs4_has_session(clp)) 250 nfs41_sequence_free_slot(clp, res); 251 #endif /* CONFIG_NFS_V4_1 */ 252 } 253 254 /* 255 * Determine the device name as a string 256 */ 257 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 258 const struct dentry *dentry, 259 char *buffer, ssize_t buflen) 260 { 261 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 262 dentry, buffer, buflen); 263 } 264 265 /* 266 * Determine the actual block size (and log2 thereof) 267 */ 268 static inline 269 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 270 { 271 /* make sure blocksize is a power of two */ 272 if ((bsize & (bsize - 1)) || nrbitsp) { 273 unsigned char nrbits; 274 275 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 276 ; 277 bsize = 1 << nrbits; 278 if (nrbitsp) 279 *nrbitsp = nrbits; 280 } 281 282 return bsize; 283 } 284 285 /* 286 * Calculate the number of 512byte blocks used. 287 */ 288 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 289 { 290 blkcnt_t used = (tsize + 511) >> 9; 291 return (used > ULONG_MAX) ? ULONG_MAX : used; 292 } 293 294 /* 295 * Compute and set NFS server blocksize 296 */ 297 static inline 298 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 299 { 300 if (bsize < NFS_MIN_FILE_IO_SIZE) 301 bsize = NFS_DEF_FILE_IO_SIZE; 302 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 303 bsize = NFS_MAX_FILE_IO_SIZE; 304 305 return nfs_block_bits(bsize, nrbitsp); 306 } 307 308 /* 309 * Determine the maximum file size for a superblock 310 */ 311 static inline 312 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 313 { 314 sb->s_maxbytes = (loff_t)maxfilesize; 315 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 316 sb->s_maxbytes = MAX_LFS_FILESIZE; 317 } 318 319 /* 320 * Determine the number of bytes of data the page contains 321 */ 322 static inline 323 unsigned int nfs_page_length(struct page *page) 324 { 325 loff_t i_size = i_size_read(page->mapping->host); 326 327 if (i_size > 0) { 328 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 329 if (page->index < end_index) 330 return PAGE_CACHE_SIZE; 331 if (page->index == end_index) 332 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 333 } 334 return 0; 335 } 336 337 /* 338 * Determine the number of pages in an array of length 'len' and 339 * with a base offset of 'base' 340 */ 341 static inline 342 unsigned int nfs_page_array_len(unsigned int base, size_t len) 343 { 344 return ((unsigned long)len + (unsigned long)base + 345 PAGE_SIZE - 1) >> PAGE_SHIFT; 346 } 347 348 #define IPV6_SCOPE_DELIMITER '%' 349 350 /* 351 * Set the port number in an address. Be agnostic about the address 352 * family. 353 */ 354 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) 355 { 356 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 357 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; 358 359 switch (sap->sa_family) { 360 case AF_INET: 361 ap->sin_port = htons(port); 362 break; 363 case AF_INET6: 364 ap6->sin6_port = htons(port); 365 break; 366 } 367 } 368