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 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 43 { 44 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 45 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 46 } 47 48 struct nfs_clone_mount { 49 const struct super_block *sb; 50 const struct dentry *dentry; 51 struct nfs_fh *fh; 52 struct nfs_fattr *fattr; 53 char *hostname; 54 char *mnt_path; 55 struct sockaddr *addr; 56 size_t addrlen; 57 rpc_authflavor_t authflavor; 58 }; 59 60 /* 61 * Note: RFC 1813 doesn't limit the number of auth flavors that 62 * a server can return, so make something up. 63 */ 64 #define NFS_MAX_SECFLAVORS (12) 65 66 /* 67 * Value used if the user did not specify a port value. 68 */ 69 #define NFS_UNSPEC_PORT (-1) 70 71 /* 72 * Maximum number of pages that readdir can use for creating 73 * a vmapped array of pages. 74 */ 75 #define NFS_MAX_READDIR_PAGES 8 76 77 /* 78 * In-kernel mount arguments 79 */ 80 struct nfs_parsed_mount_data { 81 int flags; 82 int rsize, wsize; 83 int timeo, retrans; 84 int acregmin, acregmax, 85 acdirmin, acdirmax; 86 int namlen; 87 unsigned int options; 88 unsigned int bsize; 89 unsigned int auth_flavor_len; 90 rpc_authflavor_t auth_flavors[1]; 91 char *client_address; 92 unsigned int version; 93 unsigned int minorversion; 94 char *fscache_uniq; 95 96 struct { 97 struct sockaddr_storage address; 98 size_t addrlen; 99 char *hostname; 100 u32 version; 101 int port; 102 unsigned short protocol; 103 } mount_server; 104 105 struct { 106 struct sockaddr_storage address; 107 size_t addrlen; 108 char *hostname; 109 char *export_path; 110 int port; 111 unsigned short protocol; 112 } nfs_server; 113 114 struct security_mnt_opts lsm_opts; 115 }; 116 117 /* mount_clnt.c */ 118 struct nfs_mount_request { 119 struct sockaddr *sap; 120 size_t salen; 121 char *hostname; 122 char *dirpath; 123 u32 version; 124 unsigned short protocol; 125 struct nfs_fh *fh; 126 int noresvport; 127 unsigned int *auth_flav_len; 128 rpc_authflavor_t *auth_flavs; 129 }; 130 131 extern int nfs_mount(struct nfs_mount_request *info); 132 extern void nfs_umount(const struct nfs_mount_request *info); 133 134 /* client.c */ 135 extern struct rpc_program nfs_program; 136 137 extern void nfs_cleanup_cb_ident_idr(void); 138 extern void nfs_put_client(struct nfs_client *); 139 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *); 140 extern struct nfs_client *nfs4_find_client_ident(int); 141 extern struct nfs_client * 142 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *); 143 extern struct nfs_server *nfs_create_server( 144 const struct nfs_parsed_mount_data *, 145 struct nfs_fh *); 146 extern struct nfs_server *nfs4_create_server( 147 const struct nfs_parsed_mount_data *, 148 struct nfs_fh *); 149 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 150 struct nfs_fh *); 151 extern void nfs_free_server(struct nfs_server *server); 152 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 153 struct nfs_fh *, 154 struct nfs_fattr *); 155 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 156 extern int nfs4_check_client_ready(struct nfs_client *clp); 157 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 158 const struct sockaddr *ds_addr, 159 int ds_addrlen, int ds_proto); 160 #ifdef CONFIG_PROC_FS 161 extern int __init nfs_fs_proc_init(void); 162 extern void nfs_fs_proc_exit(void); 163 #else 164 static inline int nfs_fs_proc_init(void) 165 { 166 return 0; 167 } 168 static inline void nfs_fs_proc_exit(void) 169 { 170 } 171 #endif 172 173 /* nfs4namespace.c */ 174 #ifdef CONFIG_NFS_V4 175 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry); 176 #else 177 static inline 178 struct vfsmount *nfs_do_refmount(struct dentry *dentry) 179 { 180 return ERR_PTR(-ENOENT); 181 } 182 #endif 183 184 /* callback_xdr.c */ 185 extern struct svc_version nfs4_callback_version1; 186 extern struct svc_version nfs4_callback_version4; 187 188 /* pagelist.c */ 189 extern int __init nfs_init_nfspagecache(void); 190 extern void nfs_destroy_nfspagecache(void); 191 extern int __init nfs_init_readpagecache(void); 192 extern void nfs_destroy_readpagecache(void); 193 extern int __init nfs_init_writepagecache(void); 194 extern void nfs_destroy_writepagecache(void); 195 196 extern int __init nfs_init_directcache(void); 197 extern void nfs_destroy_directcache(void); 198 199 /* nfs2xdr.c */ 200 extern int nfs_stat_to_errno(enum nfs_stat); 201 extern struct rpc_procinfo nfs_procedures[]; 202 extern int nfs2_decode_dirent(struct xdr_stream *, 203 struct nfs_entry *, int); 204 205 /* nfs3xdr.c */ 206 extern struct rpc_procinfo nfs3_procedures[]; 207 extern int nfs3_decode_dirent(struct xdr_stream *, 208 struct nfs_entry *, int); 209 210 /* nfs4xdr.c */ 211 #ifdef CONFIG_NFS_V4 212 extern int nfs4_decode_dirent(struct xdr_stream *, 213 struct nfs_entry *, int); 214 #endif 215 #ifdef CONFIG_NFS_V4_1 216 extern const u32 nfs41_maxread_overhead; 217 extern const u32 nfs41_maxwrite_overhead; 218 #endif 219 220 /* nfs4proc.c */ 221 #ifdef CONFIG_NFS_V4 222 extern struct rpc_procinfo nfs4_procedures[]; 223 void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *); 224 #endif 225 226 extern int nfs4_init_ds_session(struct nfs_client *clp); 227 228 /* proc.c */ 229 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 230 extern int nfs_init_client(struct nfs_client *clp, 231 const struct rpc_timeout *timeparms, 232 const char *ip_addr, rpc_authflavor_t authflavour, 233 int noresvport); 234 235 /* dir.c */ 236 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 237 struct shrink_control *sc); 238 239 /* inode.c */ 240 extern struct workqueue_struct *nfsiod_workqueue; 241 extern struct inode *nfs_alloc_inode(struct super_block *sb); 242 extern void nfs_destroy_inode(struct inode *); 243 extern int nfs_write_inode(struct inode *, struct writeback_control *); 244 extern void nfs_evict_inode(struct inode *); 245 #ifdef CONFIG_NFS_V4 246 extern void nfs4_evict_inode(struct inode *); 247 #endif 248 void nfs_zap_acl_cache(struct inode *inode); 249 extern int nfs_wait_bit_killable(void *word); 250 251 /* super.c */ 252 extern struct file_system_type nfs_xdev_fs_type; 253 #ifdef CONFIG_NFS_V4 254 extern struct file_system_type nfs4_xdev_fs_type; 255 extern struct file_system_type nfs4_referral_fs_type; 256 #endif 257 258 extern struct rpc_stat nfs_rpcstat; 259 260 extern int __init register_nfs_fs(void); 261 extern void __exit unregister_nfs_fs(void); 262 extern void nfs_sb_active(struct super_block *sb); 263 extern void nfs_sb_deactive(struct super_block *sb); 264 265 /* namespace.c */ 266 extern char *nfs_path(char **p, struct dentry *dentry, 267 char *buffer, ssize_t buflen); 268 extern struct vfsmount *nfs_d_automount(struct path *path); 269 270 /* getroot.c */ 271 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 272 const char *); 273 #ifdef CONFIG_NFS_V4 274 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 275 const char *); 276 277 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 278 #endif 279 280 /* read.c */ 281 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt, 282 const struct rpc_call_ops *call_ops); 283 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 284 285 /* write.c */ 286 extern void nfs_commit_free(struct nfs_write_data *p); 287 extern int nfs_initiate_write(struct nfs_write_data *data, 288 struct rpc_clnt *clnt, 289 const struct rpc_call_ops *call_ops, 290 int how); 291 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 292 extern int nfs_initiate_commit(struct nfs_write_data *data, 293 struct rpc_clnt *clnt, 294 const struct rpc_call_ops *call_ops, 295 int how); 296 extern void nfs_init_commit(struct nfs_write_data *data, 297 struct list_head *head, 298 struct pnfs_layout_segment *lseg); 299 void nfs_retry_commit(struct list_head *page_list, 300 struct pnfs_layout_segment *lseg); 301 void nfs_commit_clear_lock(struct nfs_inode *nfsi); 302 void nfs_commitdata_release(void *data); 303 void nfs_commit_release_pages(struct nfs_write_data *data); 304 305 #ifdef CONFIG_MIGRATION 306 extern int nfs_migrate_page(struct address_space *, 307 struct page *, struct page *); 308 #else 309 #define nfs_migrate_page NULL 310 #endif 311 312 /* nfs4proc.c */ 313 extern void __nfs4_read_done_cb(struct nfs_read_data *); 314 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data); 315 extern int nfs4_init_client(struct nfs_client *clp, 316 const struct rpc_timeout *timeparms, 317 const char *ip_addr, 318 rpc_authflavor_t authflavour, 319 int noresvport); 320 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data); 321 extern int _nfs4_call_sync(struct rpc_clnt *clnt, 322 struct nfs_server *server, 323 struct rpc_message *msg, 324 struct nfs4_sequence_args *args, 325 struct nfs4_sequence_res *res, 326 int cache_reply); 327 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt, 328 struct nfs_server *server, 329 struct rpc_message *msg, 330 struct nfs4_sequence_args *args, 331 struct nfs4_sequence_res *res, 332 int cache_reply); 333 334 /* 335 * Determine the device name as a string 336 */ 337 static inline char *nfs_devname(struct dentry *dentry, 338 char *buffer, ssize_t buflen) 339 { 340 char *dummy; 341 return nfs_path(&dummy, dentry, buffer, buflen); 342 } 343 344 /* 345 * Determine the actual block size (and log2 thereof) 346 */ 347 static inline 348 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 349 { 350 /* make sure blocksize is a power of two */ 351 if ((bsize & (bsize - 1)) || nrbitsp) { 352 unsigned char nrbits; 353 354 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 355 ; 356 bsize = 1 << nrbits; 357 if (nrbitsp) 358 *nrbitsp = nrbits; 359 } 360 361 return bsize; 362 } 363 364 /* 365 * Calculate the number of 512byte blocks used. 366 */ 367 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 368 { 369 blkcnt_t used = (tsize + 511) >> 9; 370 return (used > ULONG_MAX) ? ULONG_MAX : used; 371 } 372 373 /* 374 * Compute and set NFS server blocksize 375 */ 376 static inline 377 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 378 { 379 if (bsize < NFS_MIN_FILE_IO_SIZE) 380 bsize = NFS_DEF_FILE_IO_SIZE; 381 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 382 bsize = NFS_MAX_FILE_IO_SIZE; 383 384 return nfs_block_bits(bsize, nrbitsp); 385 } 386 387 /* 388 * Determine the maximum file size for a superblock 389 */ 390 static inline 391 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 392 { 393 sb->s_maxbytes = (loff_t)maxfilesize; 394 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 395 sb->s_maxbytes = MAX_LFS_FILESIZE; 396 } 397 398 /* 399 * Determine the number of bytes of data the page contains 400 */ 401 static inline 402 unsigned int nfs_page_length(struct page *page) 403 { 404 loff_t i_size = i_size_read(page->mapping->host); 405 406 if (i_size > 0) { 407 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 408 if (page->index < end_index) 409 return PAGE_CACHE_SIZE; 410 if (page->index == end_index) 411 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 412 } 413 return 0; 414 } 415 416 /* 417 * Convert a umode to a dirent->d_type 418 */ 419 static inline 420 unsigned char nfs_umode_to_dtype(umode_t mode) 421 { 422 return (mode >> 12) & 15; 423 } 424 425 /* 426 * Determine the number of pages in an array of length 'len' and 427 * with a base offset of 'base' 428 */ 429 static inline 430 unsigned int nfs_page_array_len(unsigned int base, size_t len) 431 { 432 return ((unsigned long)len + (unsigned long)base + 433 PAGE_SIZE - 1) >> PAGE_SHIFT; 434 } 435 436 /* 437 * Helper for restarting RPC calls in the possible presence of NFSv4.1 438 * sessions. 439 */ 440 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp) 441 { 442 if (nfs4_has_session(clp)) 443 return rpc_restart_call_prepare(task); 444 return rpc_restart_call(task); 445 } 446