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 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 22 { 23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 25 } 26 27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 28 { 29 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 30 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 31 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 32 return 0; 33 34 fattr->fileid = fattr->mounted_on_fileid; 35 return 1; 36 } 37 38 struct nfs_clone_mount { 39 const struct super_block *sb; 40 const struct dentry *dentry; 41 struct nfs_fh *fh; 42 struct nfs_fattr *fattr; 43 char *hostname; 44 char *mnt_path; 45 struct sockaddr *addr; 46 size_t addrlen; 47 rpc_authflavor_t authflavor; 48 }; 49 50 /* 51 * Note: RFC 1813 doesn't limit the number of auth flavors that 52 * a server can return, so make something up. 53 */ 54 #define NFS_MAX_SECFLAVORS (12) 55 56 /* 57 * Value used if the user did not specify a port value. 58 */ 59 #define NFS_UNSPEC_PORT (-1) 60 61 /* 62 * Maximum number of pages that readdir can use for creating 63 * a vmapped array of pages. 64 */ 65 #define NFS_MAX_READDIR_PAGES 8 66 67 struct nfs_client_initdata { 68 unsigned long init_flags; 69 const char *hostname; 70 const struct sockaddr *addr; 71 size_t addrlen; 72 struct nfs_subversion *nfs_mod; 73 int proto; 74 u32 minorversion; 75 struct net *net; 76 }; 77 78 /* 79 * In-kernel mount arguments 80 */ 81 struct nfs_parsed_mount_data { 82 int flags; 83 unsigned int rsize, wsize; 84 unsigned int timeo, retrans; 85 unsigned int acregmin, acregmax, 86 acdirmin, acdirmax; 87 unsigned int namlen; 88 unsigned int options; 89 unsigned int bsize; 90 unsigned int auth_flavor_len; 91 rpc_authflavor_t auth_flavors[1]; 92 char *client_address; 93 unsigned int version; 94 unsigned int minorversion; 95 char *fscache_uniq; 96 bool need_mount; 97 98 struct { 99 struct sockaddr_storage address; 100 size_t addrlen; 101 char *hostname; 102 u32 version; 103 int port; 104 unsigned short protocol; 105 } mount_server; 106 107 struct { 108 struct sockaddr_storage address; 109 size_t addrlen; 110 char *hostname; 111 char *export_path; 112 int port; 113 unsigned short protocol; 114 } nfs_server; 115 116 struct security_mnt_opts lsm_opts; 117 struct net *net; 118 }; 119 120 /* mount_clnt.c */ 121 struct nfs_mount_request { 122 struct sockaddr *sap; 123 size_t salen; 124 char *hostname; 125 char *dirpath; 126 u32 version; 127 unsigned short protocol; 128 struct nfs_fh *fh; 129 int noresvport; 130 unsigned int *auth_flav_len; 131 rpc_authflavor_t *auth_flavs; 132 struct net *net; 133 }; 134 135 struct nfs_mount_info { 136 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 137 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 138 struct nfs_parsed_mount_data *parsed; 139 struct nfs_clone_mount *cloned; 140 struct nfs_fh *mntfh; 141 }; 142 143 extern int nfs_mount(struct nfs_mount_request *info); 144 extern void nfs_umount(const struct nfs_mount_request *info); 145 146 /* client.c */ 147 extern const struct rpc_program nfs_program; 148 extern void nfs_clients_init(struct net *net); 149 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 150 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t); 151 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *, 152 const struct rpc_timeout *, const char *, 153 rpc_authflavor_t); 154 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 155 void nfs_server_insert_lists(struct nfs_server *); 156 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int); 157 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 158 rpc_authflavor_t); 159 struct nfs_server *nfs_alloc_server(void); 160 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 161 162 extern void nfs_cleanup_cb_ident_idr(struct net *); 163 extern void nfs_put_client(struct nfs_client *); 164 extern void nfs_free_client(struct nfs_client *); 165 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 166 extern struct nfs_client * 167 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 168 struct nfs4_sessionid *); 169 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 170 struct nfs_subversion *); 171 extern struct nfs_server *nfs4_create_server( 172 struct nfs_mount_info *, 173 struct nfs_subversion *); 174 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 175 struct nfs_fh *); 176 extern void nfs_free_server(struct nfs_server *server); 177 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 178 struct nfs_fh *, 179 struct nfs_fattr *, 180 rpc_authflavor_t); 181 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 182 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 183 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 184 const struct sockaddr *ds_addr, 185 int ds_addrlen, int ds_proto, 186 unsigned int ds_timeo, 187 unsigned int ds_retrans); 188 #ifdef CONFIG_PROC_FS 189 extern int __init nfs_fs_proc_init(void); 190 extern void nfs_fs_proc_exit(void); 191 #else 192 static inline int nfs_fs_proc_init(void) 193 { 194 return 0; 195 } 196 static inline void nfs_fs_proc_exit(void) 197 { 198 } 199 #endif 200 201 #ifdef CONFIG_NFS_V4_1 202 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 203 #endif 204 205 /* nfs3client.c */ 206 #if IS_ENABLED(CONFIG_NFS_V3) 207 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *); 208 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *, 209 struct nfs_fattr *, rpc_authflavor_t); 210 #endif 211 212 /* callback_xdr.c */ 213 extern struct svc_version nfs4_callback_version1; 214 extern struct svc_version nfs4_callback_version4; 215 216 struct nfs_pageio_descriptor; 217 /* pagelist.c */ 218 extern int __init nfs_init_nfspagecache(void); 219 extern void nfs_destroy_nfspagecache(void); 220 extern int __init nfs_init_readpagecache(void); 221 extern void nfs_destroy_readpagecache(void); 222 extern int __init nfs_init_writepagecache(void); 223 extern void nfs_destroy_writepagecache(void); 224 225 extern int __init nfs_init_directcache(void); 226 extern void nfs_destroy_directcache(void); 227 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount); 228 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 229 struct nfs_pgio_header *hdr, 230 void (*release)(struct nfs_pgio_header *hdr)); 231 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 232 int nfs_iocounter_wait(struct nfs_io_counter *c); 233 234 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 235 { 236 c->flags = 0; 237 atomic_set(&c->io_count, 0); 238 } 239 240 /* nfs2xdr.c */ 241 extern struct rpc_procinfo nfs_procedures[]; 242 extern int nfs2_decode_dirent(struct xdr_stream *, 243 struct nfs_entry *, int); 244 245 /* nfs3xdr.c */ 246 extern struct rpc_procinfo nfs3_procedures[]; 247 extern int nfs3_decode_dirent(struct xdr_stream *, 248 struct nfs_entry *, int); 249 250 /* nfs4xdr.c */ 251 #if IS_ENABLED(CONFIG_NFS_V4) 252 extern int nfs4_decode_dirent(struct xdr_stream *, 253 struct nfs_entry *, int); 254 #endif 255 #ifdef CONFIG_NFS_V4_1 256 extern const u32 nfs41_maxread_overhead; 257 extern const u32 nfs41_maxwrite_overhead; 258 #endif 259 260 /* nfs4proc.c */ 261 #if IS_ENABLED(CONFIG_NFS_V4) 262 extern struct rpc_procinfo nfs4_procedures[]; 263 #endif 264 265 /* proc.c */ 266 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 267 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 268 const struct rpc_timeout *timeparms, 269 const char *ip_addr, rpc_authflavor_t authflavour); 270 271 /* dir.c */ 272 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 273 struct shrink_control *sc); 274 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 275 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 276 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 277 int nfs_rmdir(struct inode *, struct dentry *); 278 int nfs_unlink(struct inode *, struct dentry *); 279 int nfs_symlink(struct inode *, struct dentry *, const char *); 280 int nfs_link(struct dentry *, struct inode *, struct dentry *); 281 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 282 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 283 284 /* file.c */ 285 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 286 loff_t nfs_file_llseek(struct file *, loff_t, int); 287 int nfs_file_flush(struct file *, fl_owner_t); 288 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); 289 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 290 size_t, unsigned int); 291 int nfs_file_mmap(struct file *, struct vm_area_struct *); 292 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); 293 int nfs_file_release(struct inode *, struct file *); 294 int nfs_lock(struct file *, int, struct file_lock *); 295 int nfs_flock(struct file *, int, struct file_lock *); 296 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, 297 size_t, unsigned int); 298 int nfs_check_flags(int); 299 int nfs_setlease(struct file *, long, struct file_lock **); 300 301 /* inode.c */ 302 extern struct workqueue_struct *nfsiod_workqueue; 303 extern struct inode *nfs_alloc_inode(struct super_block *sb); 304 extern void nfs_destroy_inode(struct inode *); 305 extern int nfs_write_inode(struct inode *, struct writeback_control *); 306 extern int nfs_drop_inode(struct inode *); 307 extern void nfs_clear_inode(struct inode *); 308 extern void nfs_evict_inode(struct inode *); 309 void nfs_zap_acl_cache(struct inode *inode); 310 extern int nfs_wait_bit_killable(void *word); 311 312 /* super.c */ 313 extern const struct super_operations nfs_sops; 314 extern struct file_system_type nfs_fs_type; 315 extern struct file_system_type nfs_xdev_fs_type; 316 #if IS_ENABLED(CONFIG_NFS_V4) 317 extern struct file_system_type nfs4_xdev_fs_type; 318 extern struct file_system_type nfs4_referral_fs_type; 319 #endif 320 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 321 struct nfs_subversion *); 322 void nfs_initialise_sb(struct super_block *); 323 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 324 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 325 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 326 struct nfs_mount_info *, struct nfs_subversion *); 327 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 328 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 329 const char *, struct nfs_mount_info *); 330 void nfs_kill_super(struct super_block *); 331 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 332 333 extern struct rpc_stat nfs_rpcstat; 334 335 extern int __init register_nfs_fs(void); 336 extern void __exit unregister_nfs_fs(void); 337 extern void nfs_sb_active(struct super_block *sb); 338 extern void nfs_sb_deactive(struct super_block *sb); 339 340 /* namespace.c */ 341 #define NFS_PATH_CANONICAL 1 342 extern char *nfs_path(char **p, struct dentry *dentry, 343 char *buffer, ssize_t buflen, unsigned flags); 344 extern struct vfsmount *nfs_d_automount(struct path *path); 345 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 346 struct nfs_fh *, struct nfs_fattr *); 347 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 348 struct nfs_fattr *, rpc_authflavor_t); 349 350 /* getroot.c */ 351 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 352 const char *); 353 #if IS_ENABLED(CONFIG_NFS_V4) 354 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 355 const char *); 356 357 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 358 #endif 359 360 struct nfs_pgio_completion_ops; 361 /* read.c */ 362 extern struct nfs_read_header *nfs_readhdr_alloc(void); 363 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr); 364 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 365 struct inode *inode, 366 const struct nfs_pgio_completion_ops *compl_ops); 367 extern int nfs_initiate_read(struct rpc_clnt *clnt, 368 struct nfs_read_data *data, 369 const struct rpc_call_ops *call_ops, int flags); 370 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 371 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 372 struct nfs_pgio_header *hdr); 373 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 374 extern void nfs_readdata_release(struct nfs_read_data *rdata); 375 376 /* super.c */ 377 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 378 void nfs_umount_begin(struct super_block *); 379 int nfs_statfs(struct dentry *, struct kstatfs *); 380 int nfs_show_options(struct seq_file *, struct dentry *); 381 int nfs_show_devname(struct seq_file *, struct dentry *); 382 int nfs_show_path(struct seq_file *, struct dentry *); 383 int nfs_show_stats(struct seq_file *, struct dentry *); 384 void nfs_put_super(struct super_block *); 385 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 386 387 /* write.c */ 388 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 389 struct inode *inode, int ioflags, 390 const struct nfs_pgio_completion_ops *compl_ops); 391 extern struct nfs_write_header *nfs_writehdr_alloc(void); 392 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr); 393 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 394 struct nfs_pgio_header *hdr); 395 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 396 extern void nfs_writedata_release(struct nfs_write_data *wdata); 397 extern void nfs_commit_free(struct nfs_commit_data *p); 398 extern int nfs_initiate_write(struct rpc_clnt *clnt, 399 struct nfs_write_data *data, 400 const struct rpc_call_ops *call_ops, 401 int how, int flags); 402 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 403 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 404 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 405 struct nfs_commit_data *data, 406 const struct rpc_call_ops *call_ops, 407 int how, int flags); 408 extern void nfs_init_commit(struct nfs_commit_data *data, 409 struct list_head *head, 410 struct pnfs_layout_segment *lseg, 411 struct nfs_commit_info *cinfo); 412 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 413 struct nfs_commit_info *cinfo, int max); 414 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 415 struct nfs_commit_info *cinfo); 416 void nfs_mark_request_commit(struct nfs_page *req, 417 struct pnfs_layout_segment *lseg, 418 struct nfs_commit_info *cinfo); 419 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 420 int how, struct nfs_commit_info *cinfo); 421 void nfs_retry_commit(struct list_head *page_list, 422 struct pnfs_layout_segment *lseg, 423 struct nfs_commit_info *cinfo); 424 void nfs_commitdata_release(struct nfs_commit_data *data); 425 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 426 struct nfs_commit_info *cinfo); 427 void nfs_request_remove_commit_list(struct nfs_page *req, 428 struct nfs_commit_info *cinfo); 429 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 430 struct inode *inode, 431 struct nfs_direct_req *dreq); 432 433 #ifdef CONFIG_MIGRATION 434 extern int nfs_migrate_page(struct address_space *, 435 struct page *, struct page *, enum migrate_mode); 436 #else 437 #define nfs_migrate_page NULL 438 #endif 439 440 /* direct.c */ 441 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 442 struct nfs_direct_req *dreq); 443 static inline void nfs_inode_dio_wait(struct inode *inode) 444 { 445 inode_dio_wait(inode); 446 } 447 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 448 449 /* nfs4proc.c */ 450 extern void __nfs4_read_done_cb(struct nfs_read_data *); 451 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 452 const struct rpc_timeout *timeparms, 453 const char *ip_addr, 454 rpc_authflavor_t authflavour); 455 extern int nfs40_walk_client_list(struct nfs_client *clp, 456 struct nfs_client **result, 457 struct rpc_cred *cred); 458 extern int nfs41_walk_client_list(struct nfs_client *clp, 459 struct nfs_client **result, 460 struct rpc_cred *cred); 461 462 /* 463 * Determine the device name as a string 464 */ 465 static inline char *nfs_devname(struct dentry *dentry, 466 char *buffer, ssize_t buflen) 467 { 468 char *dummy; 469 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 470 } 471 472 /* 473 * Determine the actual block size (and log2 thereof) 474 */ 475 static inline 476 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 477 { 478 /* make sure blocksize is a power of two */ 479 if ((bsize & (bsize - 1)) || nrbitsp) { 480 unsigned char nrbits; 481 482 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 483 ; 484 bsize = 1 << nrbits; 485 if (nrbitsp) 486 *nrbitsp = nrbits; 487 } 488 489 return bsize; 490 } 491 492 /* 493 * Calculate the number of 512byte blocks used. 494 */ 495 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 496 { 497 blkcnt_t used = (tsize + 511) >> 9; 498 return (used > ULONG_MAX) ? ULONG_MAX : used; 499 } 500 501 /* 502 * Compute and set NFS server blocksize 503 */ 504 static inline 505 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 506 { 507 if (bsize < NFS_MIN_FILE_IO_SIZE) 508 bsize = NFS_DEF_FILE_IO_SIZE; 509 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 510 bsize = NFS_MAX_FILE_IO_SIZE; 511 512 return nfs_block_bits(bsize, nrbitsp); 513 } 514 515 /* 516 * Determine the maximum file size for a superblock 517 */ 518 static inline 519 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 520 { 521 sb->s_maxbytes = (loff_t)maxfilesize; 522 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 523 sb->s_maxbytes = MAX_LFS_FILESIZE; 524 } 525 526 /* 527 * Determine the number of bytes of data the page contains 528 */ 529 static inline 530 unsigned int nfs_page_length(struct page *page) 531 { 532 loff_t i_size = i_size_read(page_file_mapping(page)->host); 533 534 if (i_size > 0) { 535 pgoff_t page_index = page_file_index(page); 536 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 537 if (page_index < end_index) 538 return PAGE_CACHE_SIZE; 539 if (page_index == end_index) 540 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 541 } 542 return 0; 543 } 544 545 /* 546 * Convert a umode to a dirent->d_type 547 */ 548 static inline 549 unsigned char nfs_umode_to_dtype(umode_t mode) 550 { 551 return (mode >> 12) & 15; 552 } 553 554 /* 555 * Determine the number of pages in an array of length 'len' and 556 * with a base offset of 'base' 557 */ 558 static inline 559 unsigned int nfs_page_array_len(unsigned int base, size_t len) 560 { 561 return ((unsigned long)len + (unsigned long)base + 562 PAGE_SIZE - 1) >> PAGE_SHIFT; 563 } 564 565 /* 566 * Convert a struct timespec into a 64-bit change attribute 567 * 568 * This does approximately the same thing as timespec_to_ns(), 569 * but for calculation efficiency, we multiply the seconds by 570 * 1024*1024*1024. 571 */ 572 static inline 573 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 574 { 575 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 576 } 577