1 /* 2 * NFS internal definitions 3 */ 4 5 #include "nfs4_fs.h" 6 #include <linux/mount.h> 7 #include <linux/security.h> 8 9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 10 11 struct nfs_string; 12 13 /* Maximum number of readahead requests 14 * FIXME: this should really be a sysctl so that users may tune it to suit 15 * their needs. People that do NFS over a slow network, might for 16 * instance want to reduce it to something closer to 1 for improved 17 * interactive response. 18 */ 19 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 20 21 /* 22 * Determine if sessions are in use. 23 */ 24 static inline int nfs4_has_session(const struct nfs_client *clp) 25 { 26 #ifdef CONFIG_NFS_V4_1 27 if (clp->cl_session) 28 return 1; 29 #endif /* CONFIG_NFS_V4_1 */ 30 return 0; 31 } 32 33 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 34 { 35 #ifdef CONFIG_NFS_V4_1 36 if (nfs4_has_session(clp)) 37 return (clp->cl_session->flags & SESSION4_PERSIST); 38 #endif /* CONFIG_NFS_V4_1 */ 39 return 0; 40 } 41 42 struct nfs_clone_mount { 43 const struct super_block *sb; 44 const struct dentry *dentry; 45 struct nfs_fh *fh; 46 struct nfs_fattr *fattr; 47 char *hostname; 48 char *mnt_path; 49 struct sockaddr *addr; 50 size_t addrlen; 51 rpc_authflavor_t authflavor; 52 }; 53 54 /* 55 * Note: RFC 1813 doesn't limit the number of auth flavors that 56 * a server can return, so make something up. 57 */ 58 #define NFS_MAX_SECFLAVORS (12) 59 60 /* 61 * Value used if the user did not specify a port value. 62 */ 63 #define NFS_UNSPEC_PORT (-1) 64 65 /* 66 * Maximum number of pages that readdir can use for creating 67 * a vmapped array of pages. 68 */ 69 #define NFS_MAX_READDIR_PAGES 8 70 71 /* 72 * In-kernel mount arguments 73 */ 74 struct nfs_parsed_mount_data { 75 int flags; 76 int rsize, wsize; 77 int timeo, retrans; 78 int acregmin, acregmax, 79 acdirmin, acdirmax; 80 int namlen; 81 unsigned int options; 82 unsigned int bsize; 83 unsigned int auth_flavor_len; 84 rpc_authflavor_t auth_flavors[1]; 85 char *client_address; 86 unsigned int version; 87 unsigned int minorversion; 88 char *fscache_uniq; 89 90 struct { 91 struct sockaddr_storage address; 92 size_t addrlen; 93 char *hostname; 94 u32 version; 95 int port; 96 unsigned short protocol; 97 } mount_server; 98 99 struct { 100 struct sockaddr_storage address; 101 size_t addrlen; 102 char *hostname; 103 char *export_path; 104 int port; 105 unsigned short protocol; 106 } nfs_server; 107 108 struct security_mnt_opts lsm_opts; 109 }; 110 111 /* mount_clnt.c */ 112 struct nfs_mount_request { 113 struct sockaddr *sap; 114 size_t salen; 115 char *hostname; 116 char *dirpath; 117 u32 version; 118 unsigned short protocol; 119 struct nfs_fh *fh; 120 int noresvport; 121 unsigned int *auth_flav_len; 122 rpc_authflavor_t *auth_flavs; 123 }; 124 125 extern int nfs_mount(struct nfs_mount_request *info); 126 extern void nfs_umount(const struct nfs_mount_request *info); 127 128 /* client.c */ 129 extern struct rpc_program nfs_program; 130 131 extern void nfs_cleanup_cb_ident_idr(void); 132 extern void nfs_put_client(struct nfs_client *); 133 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *); 134 extern struct nfs_client *nfs4_find_client_ident(int); 135 extern struct nfs_client * 136 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *); 137 extern struct nfs_server *nfs_create_server( 138 const struct nfs_parsed_mount_data *, 139 struct nfs_fh *); 140 extern struct nfs_server *nfs4_create_server( 141 const struct nfs_parsed_mount_data *, 142 struct nfs_fh *); 143 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 144 struct nfs_fh *); 145 extern void nfs_free_server(struct nfs_server *server); 146 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 147 struct nfs_fh *, 148 struct nfs_fattr *); 149 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 150 extern int nfs4_check_client_ready(struct nfs_client *clp); 151 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 152 const struct sockaddr *ds_addr, 153 int ds_addrlen, int ds_proto); 154 #ifdef CONFIG_PROC_FS 155 extern int __init nfs_fs_proc_init(void); 156 extern void nfs_fs_proc_exit(void); 157 #else 158 static inline int nfs_fs_proc_init(void) 159 { 160 return 0; 161 } 162 static inline void nfs_fs_proc_exit(void) 163 { 164 } 165 #endif 166 167 /* nfs4namespace.c */ 168 #ifdef CONFIG_NFS_V4 169 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry); 170 #else 171 static inline 172 struct vfsmount *nfs_do_refmount(struct dentry *dentry) 173 { 174 return ERR_PTR(-ENOENT); 175 } 176 #endif 177 178 /* callback_xdr.c */ 179 extern struct svc_version nfs4_callback_version1; 180 extern struct svc_version nfs4_callback_version4; 181 182 /* pagelist.c */ 183 extern int __init nfs_init_nfspagecache(void); 184 extern void nfs_destroy_nfspagecache(void); 185 extern int __init nfs_init_readpagecache(void); 186 extern void nfs_destroy_readpagecache(void); 187 extern int __init nfs_init_writepagecache(void); 188 extern void nfs_destroy_writepagecache(void); 189 190 extern int __init nfs_init_directcache(void); 191 extern void nfs_destroy_directcache(void); 192 193 /* nfs2xdr.c */ 194 extern int nfs_stat_to_errno(enum nfs_stat); 195 extern struct rpc_procinfo nfs_procedures[]; 196 extern int nfs2_decode_dirent(struct xdr_stream *, 197 struct nfs_entry *, int); 198 199 /* nfs3xdr.c */ 200 extern struct rpc_procinfo nfs3_procedures[]; 201 extern int nfs3_decode_dirent(struct xdr_stream *, 202 struct nfs_entry *, int); 203 204 /* nfs4xdr.c */ 205 #ifdef CONFIG_NFS_V4 206 extern int nfs4_decode_dirent(struct xdr_stream *, 207 struct nfs_entry *, int); 208 #endif 209 #ifdef CONFIG_NFS_V4_1 210 extern const u32 nfs41_maxread_overhead; 211 extern const u32 nfs41_maxwrite_overhead; 212 #endif 213 214 /* nfs4proc.c */ 215 #ifdef CONFIG_NFS_V4 216 extern struct rpc_procinfo nfs4_procedures[]; 217 #endif 218 219 extern int nfs4_init_ds_session(struct nfs_client *clp); 220 221 /* proc.c */ 222 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 223 extern int nfs_init_client(struct nfs_client *clp, 224 const struct rpc_timeout *timeparms, 225 const char *ip_addr, rpc_authflavor_t authflavour, 226 int noresvport); 227 228 /* dir.c */ 229 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 230 int nr_to_scan, gfp_t gfp_mask); 231 232 /* inode.c */ 233 extern struct workqueue_struct *nfsiod_workqueue; 234 extern struct inode *nfs_alloc_inode(struct super_block *sb); 235 extern void nfs_destroy_inode(struct inode *); 236 extern int nfs_write_inode(struct inode *, struct writeback_control *); 237 extern void nfs_evict_inode(struct inode *); 238 #ifdef CONFIG_NFS_V4 239 extern void nfs4_evict_inode(struct inode *); 240 #endif 241 void nfs_zap_acl_cache(struct inode *inode); 242 extern int nfs_wait_bit_killable(void *word); 243 244 /* super.c */ 245 extern struct file_system_type nfs_xdev_fs_type; 246 #ifdef CONFIG_NFS_V4 247 extern struct file_system_type nfs4_xdev_fs_type; 248 extern struct file_system_type nfs4_referral_fs_type; 249 #endif 250 251 extern struct rpc_stat nfs_rpcstat; 252 253 extern int __init register_nfs_fs(void); 254 extern void __exit unregister_nfs_fs(void); 255 extern void nfs_sb_active(struct super_block *sb); 256 extern void nfs_sb_deactive(struct super_block *sb); 257 258 /* namespace.c */ 259 extern char *nfs_path(char **p, struct dentry *dentry, 260 char *buffer, ssize_t buflen); 261 extern struct vfsmount *nfs_d_automount(struct path *path); 262 263 /* getroot.c */ 264 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 265 const char *); 266 #ifdef CONFIG_NFS_V4 267 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 268 const char *); 269 270 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 271 #endif 272 273 /* read.c */ 274 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt, 275 const struct rpc_call_ops *call_ops); 276 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 277 278 /* write.c */ 279 extern int nfs_initiate_write(struct nfs_write_data *data, 280 struct rpc_clnt *clnt, 281 const struct rpc_call_ops *call_ops, 282 int how); 283 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 284 #ifdef CONFIG_MIGRATION 285 extern int nfs_migrate_page(struct address_space *, 286 struct page *, struct page *); 287 #else 288 #define nfs_migrate_page NULL 289 #endif 290 291 /* nfs4proc.c */ 292 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data); 293 extern int nfs4_init_client(struct nfs_client *clp, 294 const struct rpc_timeout *timeparms, 295 const char *ip_addr, 296 rpc_authflavor_t authflavour, 297 int noresvport); 298 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data); 299 extern int _nfs4_call_sync(struct nfs_server *server, 300 struct rpc_message *msg, 301 struct nfs4_sequence_args *args, 302 struct nfs4_sequence_res *res, 303 int cache_reply); 304 extern int _nfs4_call_sync_session(struct nfs_server *server, 305 struct rpc_message *msg, 306 struct nfs4_sequence_args *args, 307 struct nfs4_sequence_res *res, 308 int cache_reply); 309 310 /* 311 * Determine the device name as a string 312 */ 313 static inline char *nfs_devname(struct dentry *dentry, 314 char *buffer, ssize_t buflen) 315 { 316 char *dummy; 317 return nfs_path(&dummy, dentry, buffer, buflen); 318 } 319 320 /* 321 * Determine the actual block size (and log2 thereof) 322 */ 323 static inline 324 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 325 { 326 /* make sure blocksize is a power of two */ 327 if ((bsize & (bsize - 1)) || nrbitsp) { 328 unsigned char nrbits; 329 330 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 331 ; 332 bsize = 1 << nrbits; 333 if (nrbitsp) 334 *nrbitsp = nrbits; 335 } 336 337 return bsize; 338 } 339 340 /* 341 * Calculate the number of 512byte blocks used. 342 */ 343 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 344 { 345 blkcnt_t used = (tsize + 511) >> 9; 346 return (used > ULONG_MAX) ? ULONG_MAX : used; 347 } 348 349 /* 350 * Compute and set NFS server blocksize 351 */ 352 static inline 353 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 354 { 355 if (bsize < NFS_MIN_FILE_IO_SIZE) 356 bsize = NFS_DEF_FILE_IO_SIZE; 357 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 358 bsize = NFS_MAX_FILE_IO_SIZE; 359 360 return nfs_block_bits(bsize, nrbitsp); 361 } 362 363 /* 364 * Determine the maximum file size for a superblock 365 */ 366 static inline 367 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 368 { 369 sb->s_maxbytes = (loff_t)maxfilesize; 370 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 371 sb->s_maxbytes = MAX_LFS_FILESIZE; 372 } 373 374 /* 375 * Determine the number of bytes of data the page contains 376 */ 377 static inline 378 unsigned int nfs_page_length(struct page *page) 379 { 380 loff_t i_size = i_size_read(page->mapping->host); 381 382 if (i_size > 0) { 383 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 384 if (page->index < end_index) 385 return PAGE_CACHE_SIZE; 386 if (page->index == end_index) 387 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 388 } 389 return 0; 390 } 391 392 /* 393 * Convert a umode to a dirent->d_type 394 */ 395 static inline 396 unsigned char nfs_umode_to_dtype(umode_t mode) 397 { 398 return (mode >> 12) & 15; 399 } 400 401 /* 402 * Determine the number of pages in an array of length 'len' and 403 * with a base offset of 'base' 404 */ 405 static inline 406 unsigned int nfs_page_array_len(unsigned int base, size_t len) 407 { 408 return ((unsigned long)len + (unsigned long)base + 409 PAGE_SIZE - 1) >> PAGE_SHIFT; 410 } 411 412 /* 413 * Helper for restarting RPC calls in the possible presence of NFSv4.1 414 * sessions. 415 */ 416 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp) 417 { 418 if (nfs4_has_session(clp)) 419 return rpc_restart_call_prepare(task); 420 return rpc_restart_call(task); 421 } 422