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 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 49 { 50 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 51 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 52 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 53 return 0; 54 55 fattr->fileid = fattr->mounted_on_fileid; 56 return 1; 57 } 58 59 struct nfs_clone_mount { 60 const struct super_block *sb; 61 const struct dentry *dentry; 62 struct nfs_fh *fh; 63 struct nfs_fattr *fattr; 64 char *hostname; 65 char *mnt_path; 66 struct sockaddr *addr; 67 size_t addrlen; 68 rpc_authflavor_t authflavor; 69 }; 70 71 /* 72 * Note: RFC 1813 doesn't limit the number of auth flavors that 73 * a server can return, so make something up. 74 */ 75 #define NFS_MAX_SECFLAVORS (12) 76 77 /* 78 * Value used if the user did not specify a port value. 79 */ 80 #define NFS_UNSPEC_PORT (-1) 81 82 /* 83 * Maximum number of pages that readdir can use for creating 84 * a vmapped array of pages. 85 */ 86 #define NFS_MAX_READDIR_PAGES 8 87 88 /* 89 * In-kernel mount arguments 90 */ 91 struct nfs_parsed_mount_data { 92 int flags; 93 int rsize, wsize; 94 int timeo, retrans; 95 int acregmin, acregmax, 96 acdirmin, acdirmax; 97 int namlen; 98 unsigned int options; 99 unsigned int bsize; 100 unsigned int auth_flavor_len; 101 rpc_authflavor_t auth_flavors[1]; 102 char *client_address; 103 unsigned int version; 104 unsigned int minorversion; 105 char *fscache_uniq; 106 bool need_mount; 107 108 struct { 109 struct sockaddr_storage address; 110 size_t addrlen; 111 char *hostname; 112 u32 version; 113 int port; 114 unsigned short protocol; 115 } mount_server; 116 117 struct { 118 struct sockaddr_storage address; 119 size_t addrlen; 120 char *hostname; 121 char *export_path; 122 int port; 123 unsigned short protocol; 124 } nfs_server; 125 126 struct security_mnt_opts lsm_opts; 127 struct net *net; 128 }; 129 130 /* mount_clnt.c */ 131 struct nfs_mount_request { 132 struct sockaddr *sap; 133 size_t salen; 134 char *hostname; 135 char *dirpath; 136 u32 version; 137 unsigned short protocol; 138 struct nfs_fh *fh; 139 int noresvport; 140 unsigned int *auth_flav_len; 141 rpc_authflavor_t *auth_flavs; 142 struct net *net; 143 }; 144 145 extern int nfs_mount(struct nfs_mount_request *info); 146 extern void nfs_umount(const struct nfs_mount_request *info); 147 148 /* client.c */ 149 extern const struct rpc_program nfs_program; 150 extern void nfs_clients_init(struct net *net); 151 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 152 153 extern void nfs_cleanup_cb_ident_idr(struct net *); 154 extern void nfs_put_client(struct nfs_client *); 155 extern void nfs_free_client(struct nfs_client *); 156 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 157 extern struct nfs_client * 158 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 159 struct nfs4_sessionid *); 160 extern struct nfs_server *nfs_create_server( 161 const struct nfs_parsed_mount_data *, 162 struct nfs_fh *); 163 extern struct nfs_server *nfs4_create_server( 164 const struct nfs_parsed_mount_data *, 165 struct nfs_fh *); 166 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 167 struct nfs_fh *); 168 extern void nfs_free_server(struct nfs_server *server); 169 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 170 struct nfs_fh *, 171 struct nfs_fattr *, 172 rpc_authflavor_t); 173 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 174 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 175 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 176 const struct sockaddr *ds_addr, 177 int ds_addrlen, int ds_proto, 178 unsigned int ds_timeo, 179 unsigned int ds_retrans); 180 #ifdef CONFIG_PROC_FS 181 extern int __init nfs_fs_proc_init(void); 182 extern void nfs_fs_proc_exit(void); 183 #else 184 static inline int nfs_fs_proc_init(void) 185 { 186 return 0; 187 } 188 static inline void nfs_fs_proc_exit(void) 189 { 190 } 191 #endif 192 193 /* callback_xdr.c */ 194 extern struct svc_version nfs4_callback_version1; 195 extern struct svc_version nfs4_callback_version4; 196 197 struct nfs_pageio_descriptor; 198 /* pagelist.c */ 199 extern int __init nfs_init_nfspagecache(void); 200 extern void nfs_destroy_nfspagecache(void); 201 extern int __init nfs_init_readpagecache(void); 202 extern void nfs_destroy_readpagecache(void); 203 extern int __init nfs_init_writepagecache(void); 204 extern void nfs_destroy_writepagecache(void); 205 206 extern int __init nfs_init_directcache(void); 207 extern void nfs_destroy_directcache(void); 208 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount); 209 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 210 struct nfs_pgio_header *hdr, 211 void (*release)(struct nfs_pgio_header *hdr)); 212 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 213 214 /* nfs2xdr.c */ 215 extern struct rpc_procinfo nfs_procedures[]; 216 extern int nfs2_decode_dirent(struct xdr_stream *, 217 struct nfs_entry *, int); 218 219 /* nfs3xdr.c */ 220 extern struct rpc_procinfo nfs3_procedures[]; 221 extern int nfs3_decode_dirent(struct xdr_stream *, 222 struct nfs_entry *, int); 223 224 /* nfs4xdr.c */ 225 #ifdef CONFIG_NFS_V4 226 extern int nfs4_decode_dirent(struct xdr_stream *, 227 struct nfs_entry *, int); 228 #endif 229 #ifdef CONFIG_NFS_V4_1 230 extern const u32 nfs41_maxread_overhead; 231 extern const u32 nfs41_maxwrite_overhead; 232 #endif 233 234 /* nfs4proc.c */ 235 #ifdef CONFIG_NFS_V4 236 extern struct rpc_procinfo nfs4_procedures[]; 237 #endif 238 239 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); 240 241 /* proc.c */ 242 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 243 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 244 const struct rpc_timeout *timeparms, 245 const char *ip_addr, rpc_authflavor_t authflavour); 246 247 /* dir.c */ 248 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 249 struct shrink_control *sc); 250 251 /* inode.c */ 252 extern struct workqueue_struct *nfsiod_workqueue; 253 extern struct inode *nfs_alloc_inode(struct super_block *sb); 254 extern void nfs_destroy_inode(struct inode *); 255 extern int nfs_write_inode(struct inode *, struct writeback_control *); 256 extern void nfs_evict_inode(struct inode *); 257 #ifdef CONFIG_NFS_V4 258 extern void nfs4_evict_inode(struct inode *); 259 #endif 260 void nfs_zap_acl_cache(struct inode *inode); 261 extern int nfs_wait_bit_killable(void *word); 262 263 /* super.c */ 264 extern struct file_system_type nfs_xdev_fs_type; 265 #ifdef CONFIG_NFS_V4 266 extern struct file_system_type nfs4_xdev_fs_type; 267 extern struct file_system_type nfs4_referral_fs_type; 268 #endif 269 270 extern struct rpc_stat nfs_rpcstat; 271 272 extern int __init register_nfs_fs(void); 273 extern void __exit unregister_nfs_fs(void); 274 extern void nfs_sb_active(struct super_block *sb); 275 extern void nfs_sb_deactive(struct super_block *sb); 276 277 /* namespace.c */ 278 extern char *nfs_path(char **p, struct dentry *dentry, 279 char *buffer, ssize_t buflen); 280 extern struct vfsmount *nfs_d_automount(struct path *path); 281 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 282 struct nfs_fh *, struct nfs_fattr *); 283 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 284 struct nfs_fattr *, rpc_authflavor_t); 285 286 /* getroot.c */ 287 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 288 const char *); 289 #ifdef CONFIG_NFS_V4 290 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 291 const char *); 292 293 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 294 #endif 295 296 struct nfs_pgio_completion_ops; 297 /* read.c */ 298 extern struct nfs_read_header *nfs_readhdr_alloc(void); 299 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr); 300 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 301 struct inode *inode, 302 const struct nfs_pgio_completion_ops *compl_ops); 303 extern int nfs_initiate_read(struct rpc_clnt *clnt, 304 struct nfs_read_data *data, 305 const struct rpc_call_ops *call_ops, int flags); 306 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 307 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 308 struct nfs_pgio_header *hdr); 309 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 310 struct inode *inode, 311 const struct nfs_pgio_completion_ops *compl_ops); 312 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 313 extern void nfs_readdata_release(struct nfs_read_data *rdata); 314 315 /* write.c */ 316 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 317 struct inode *inode, int ioflags, 318 const struct nfs_pgio_completion_ops *compl_ops); 319 extern struct nfs_write_header *nfs_writehdr_alloc(void); 320 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr); 321 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 322 struct nfs_pgio_header *hdr); 323 extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio, 324 struct inode *inode, int ioflags, 325 const struct nfs_pgio_completion_ops *compl_ops); 326 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 327 extern void nfs_writedata_release(struct nfs_write_data *wdata); 328 extern void nfs_commit_free(struct nfs_commit_data *p); 329 extern int nfs_initiate_write(struct rpc_clnt *clnt, 330 struct nfs_write_data *data, 331 const struct rpc_call_ops *call_ops, 332 int how, int flags); 333 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 334 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 335 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 336 struct nfs_commit_data *data, 337 const struct rpc_call_ops *call_ops, 338 int how, int flags); 339 extern void nfs_init_commit(struct nfs_commit_data *data, 340 struct list_head *head, 341 struct pnfs_layout_segment *lseg, 342 struct nfs_commit_info *cinfo); 343 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 344 struct nfs_commit_info *cinfo, int max); 345 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 346 struct nfs_commit_info *cinfo); 347 void nfs_mark_request_commit(struct nfs_page *req, 348 struct pnfs_layout_segment *lseg, 349 struct nfs_commit_info *cinfo); 350 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 351 int how, struct nfs_commit_info *cinfo); 352 void nfs_retry_commit(struct list_head *page_list, 353 struct pnfs_layout_segment *lseg, 354 struct nfs_commit_info *cinfo); 355 void nfs_commitdata_release(struct nfs_commit_data *data); 356 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 357 struct nfs_commit_info *cinfo); 358 void nfs_request_remove_commit_list(struct nfs_page *req, 359 struct nfs_commit_info *cinfo); 360 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 361 struct inode *inode, 362 struct nfs_direct_req *dreq); 363 364 #ifdef CONFIG_MIGRATION 365 extern int nfs_migrate_page(struct address_space *, 366 struct page *, struct page *, enum migrate_mode); 367 #else 368 #define nfs_migrate_page NULL 369 #endif 370 371 /* direct.c */ 372 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 373 struct nfs_direct_req *dreq); 374 static inline void nfs_inode_dio_wait(struct inode *inode) 375 { 376 inode_dio_wait(inode); 377 } 378 379 /* nfs4proc.c */ 380 extern void __nfs4_read_done_cb(struct nfs_read_data *); 381 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 382 const struct rpc_timeout *timeparms, 383 const char *ip_addr, 384 rpc_authflavor_t authflavour); 385 extern int _nfs4_call_sync(struct rpc_clnt *clnt, 386 struct nfs_server *server, 387 struct rpc_message *msg, 388 struct nfs4_sequence_args *args, 389 struct nfs4_sequence_res *res, 390 int cache_reply); 391 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt, 392 struct nfs_server *server, 393 struct rpc_message *msg, 394 struct nfs4_sequence_args *args, 395 struct nfs4_sequence_res *res, 396 int cache_reply); 397 398 /* 399 * Determine the device name as a string 400 */ 401 static inline char *nfs_devname(struct dentry *dentry, 402 char *buffer, ssize_t buflen) 403 { 404 char *dummy; 405 return nfs_path(&dummy, dentry, buffer, buflen); 406 } 407 408 /* 409 * Determine the actual block size (and log2 thereof) 410 */ 411 static inline 412 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 413 { 414 /* make sure blocksize is a power of two */ 415 if ((bsize & (bsize - 1)) || nrbitsp) { 416 unsigned char nrbits; 417 418 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 419 ; 420 bsize = 1 << nrbits; 421 if (nrbitsp) 422 *nrbitsp = nrbits; 423 } 424 425 return bsize; 426 } 427 428 /* 429 * Calculate the number of 512byte blocks used. 430 */ 431 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 432 { 433 blkcnt_t used = (tsize + 511) >> 9; 434 return (used > ULONG_MAX) ? ULONG_MAX : used; 435 } 436 437 /* 438 * Compute and set NFS server blocksize 439 */ 440 static inline 441 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 442 { 443 if (bsize < NFS_MIN_FILE_IO_SIZE) 444 bsize = NFS_DEF_FILE_IO_SIZE; 445 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 446 bsize = NFS_MAX_FILE_IO_SIZE; 447 448 return nfs_block_bits(bsize, nrbitsp); 449 } 450 451 /* 452 * Determine the maximum file size for a superblock 453 */ 454 static inline 455 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 456 { 457 sb->s_maxbytes = (loff_t)maxfilesize; 458 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 459 sb->s_maxbytes = MAX_LFS_FILESIZE; 460 } 461 462 /* 463 * Determine the number of bytes of data the page contains 464 */ 465 static inline 466 unsigned int nfs_page_length(struct page *page) 467 { 468 loff_t i_size = i_size_read(page->mapping->host); 469 470 if (i_size > 0) { 471 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 472 if (page->index < end_index) 473 return PAGE_CACHE_SIZE; 474 if (page->index == end_index) 475 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 476 } 477 return 0; 478 } 479 480 /* 481 * Convert a umode to a dirent->d_type 482 */ 483 static inline 484 unsigned char nfs_umode_to_dtype(umode_t mode) 485 { 486 return (mode >> 12) & 15; 487 } 488 489 /* 490 * Determine the number of pages in an array of length 'len' and 491 * with a base offset of 'base' 492 */ 493 static inline 494 unsigned int nfs_page_array_len(unsigned int base, size_t len) 495 { 496 return ((unsigned long)len + (unsigned long)base + 497 PAGE_SIZE - 1) >> PAGE_SHIFT; 498 } 499 500 /* 501 * Convert a struct timespec into a 64-bit change attribute 502 * 503 * This does approximately the same thing as timespec_to_ns(), 504 * but for calculation efficiency, we multiply the seconds by 505 * 1024*1024*1024. 506 */ 507 static inline 508 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 509 { 510 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 511 } 512