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; 106 107 struct { 108 struct sockaddr_storage address; 109 size_t addrlen; 110 char *hostname; 111 u32 version; 112 int port; 113 unsigned short protocol; 114 } mount_server; 115 116 struct { 117 struct sockaddr_storage address; 118 size_t addrlen; 119 char *hostname; 120 char *export_path; 121 int port; 122 unsigned short protocol; 123 } nfs_server; 124 125 struct security_mnt_opts lsm_opts; 126 struct net *net; 127 }; 128 129 /* mount_clnt.c */ 130 struct nfs_mount_request { 131 struct sockaddr *sap; 132 size_t salen; 133 char *hostname; 134 char *dirpath; 135 u32 version; 136 unsigned short protocol; 137 struct nfs_fh *fh; 138 int noresvport; 139 unsigned int *auth_flav_len; 140 rpc_authflavor_t *auth_flavs; 141 struct net *net; 142 }; 143 144 extern int nfs_mount(struct nfs_mount_request *info); 145 extern void nfs_umount(const struct nfs_mount_request *info); 146 147 /* client.c */ 148 extern const struct rpc_program nfs_program; 149 extern void nfs_clients_init(struct net *net); 150 151 extern void nfs_cleanup_cb_ident_idr(struct net *); 152 extern void nfs_put_client(struct nfs_client *); 153 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 154 extern struct nfs_client * 155 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 156 struct nfs4_sessionid *); 157 extern struct nfs_server *nfs_create_server( 158 const struct nfs_parsed_mount_data *, 159 struct nfs_fh *); 160 extern struct nfs_server *nfs4_create_server( 161 const struct nfs_parsed_mount_data *, 162 struct nfs_fh *); 163 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 164 struct nfs_fh *); 165 extern void nfs_free_server(struct nfs_server *server); 166 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 167 struct nfs_fh *, 168 struct nfs_fattr *, 169 rpc_authflavor_t); 170 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 171 extern int nfs4_check_client_ready(struct nfs_client *clp); 172 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 173 const struct sockaddr *ds_addr, 174 int ds_addrlen, int ds_proto); 175 #ifdef CONFIG_PROC_FS 176 extern int __init nfs_fs_proc_init(void); 177 extern void nfs_fs_proc_exit(void); 178 #else 179 static inline int nfs_fs_proc_init(void) 180 { 181 return 0; 182 } 183 static inline void nfs_fs_proc_exit(void) 184 { 185 } 186 #endif 187 188 /* nfs4namespace.c */ 189 #ifdef CONFIG_NFS_V4 190 extern struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry); 191 #else 192 static inline 193 struct vfsmount *nfs_do_refmount(struct rpc_clnt *client, struct dentry *dentry) 194 { 195 return ERR_PTR(-ENOENT); 196 } 197 #endif 198 199 /* callback_xdr.c */ 200 extern struct svc_version nfs4_callback_version1; 201 extern struct svc_version nfs4_callback_version4; 202 203 struct nfs_pageio_descriptor; 204 /* pagelist.c */ 205 extern int __init nfs_init_nfspagecache(void); 206 extern void nfs_destroy_nfspagecache(void); 207 extern int __init nfs_init_readpagecache(void); 208 extern void nfs_destroy_readpagecache(void); 209 extern int __init nfs_init_writepagecache(void); 210 extern void nfs_destroy_writepagecache(void); 211 212 extern int __init nfs_init_directcache(void); 213 extern void nfs_destroy_directcache(void); 214 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount); 215 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 216 struct nfs_pgio_header *hdr, 217 void (*release)(struct nfs_pgio_header *hdr)); 218 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 219 220 /* nfs2xdr.c */ 221 extern int nfs_stat_to_errno(enum nfs_stat); 222 extern struct rpc_procinfo nfs_procedures[]; 223 extern int nfs2_decode_dirent(struct xdr_stream *, 224 struct nfs_entry *, int); 225 226 /* nfs3xdr.c */ 227 extern struct rpc_procinfo nfs3_procedures[]; 228 extern int nfs3_decode_dirent(struct xdr_stream *, 229 struct nfs_entry *, int); 230 231 /* nfs4xdr.c */ 232 #ifdef CONFIG_NFS_V4 233 extern int nfs4_decode_dirent(struct xdr_stream *, 234 struct nfs_entry *, int); 235 #endif 236 #ifdef CONFIG_NFS_V4_1 237 extern const u32 nfs41_maxread_overhead; 238 extern const u32 nfs41_maxwrite_overhead; 239 #endif 240 241 /* nfs4proc.c */ 242 #ifdef CONFIG_NFS_V4 243 extern struct rpc_procinfo nfs4_procedures[]; 244 #endif 245 246 extern int nfs4_init_ds_session(struct nfs_client *clp); 247 248 /* proc.c */ 249 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 250 extern int nfs_init_client(struct nfs_client *clp, 251 const struct rpc_timeout *timeparms, 252 const char *ip_addr, rpc_authflavor_t authflavour, 253 int noresvport); 254 255 /* dir.c */ 256 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 257 struct shrink_control *sc); 258 259 /* inode.c */ 260 extern struct workqueue_struct *nfsiod_workqueue; 261 extern struct inode *nfs_alloc_inode(struct super_block *sb); 262 extern void nfs_destroy_inode(struct inode *); 263 extern int nfs_write_inode(struct inode *, struct writeback_control *); 264 extern void nfs_evict_inode(struct inode *); 265 #ifdef CONFIG_NFS_V4 266 extern void nfs4_evict_inode(struct inode *); 267 #endif 268 void nfs_zap_acl_cache(struct inode *inode); 269 extern int nfs_wait_bit_killable(void *word); 270 271 /* super.c */ 272 extern struct file_system_type nfs_xdev_fs_type; 273 #ifdef CONFIG_NFS_V4 274 extern struct file_system_type nfs4_xdev_fs_type; 275 extern struct file_system_type nfs4_referral_fs_type; 276 #endif 277 278 extern struct rpc_stat nfs_rpcstat; 279 280 extern int __init register_nfs_fs(void); 281 extern void __exit unregister_nfs_fs(void); 282 extern void nfs_sb_active(struct super_block *sb); 283 extern void nfs_sb_deactive(struct super_block *sb); 284 285 /* namespace.c */ 286 extern char *nfs_path(char **p, struct dentry *dentry, 287 char *buffer, ssize_t buflen); 288 extern struct vfsmount *nfs_d_automount(struct path *path); 289 #ifdef CONFIG_NFS_V4 290 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *); 291 #endif 292 293 /* getroot.c */ 294 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 295 const char *); 296 #ifdef CONFIG_NFS_V4 297 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 298 const char *); 299 300 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 301 #endif 302 303 struct nfs_pgio_completion_ops; 304 /* read.c */ 305 extern struct nfs_read_header *nfs_readhdr_alloc(void); 306 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr); 307 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 308 struct inode *inode, 309 const struct nfs_pgio_completion_ops *compl_ops); 310 extern int nfs_initiate_read(struct rpc_clnt *clnt, 311 struct nfs_read_data *data, 312 const struct rpc_call_ops *call_ops); 313 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 314 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 315 struct nfs_pgio_header *hdr); 316 extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio, 317 struct inode *inode, 318 const struct nfs_pgio_completion_ops *compl_ops); 319 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 320 extern void nfs_readdata_release(struct nfs_read_data *rdata); 321 322 /* write.c */ 323 extern struct nfs_write_header *nfs_writehdr_alloc(void); 324 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr); 325 extern struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr, 326 unsigned int pagecount); 327 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 328 struct nfs_pgio_header *hdr); 329 extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio, 330 struct inode *inode, int ioflags, 331 const struct nfs_pgio_completion_ops *compl_ops); 332 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 333 extern void nfs_writedata_release(struct nfs_write_data *wdata); 334 extern void nfs_commit_free(struct nfs_commit_data *p); 335 extern int nfs_initiate_write(struct rpc_clnt *clnt, 336 struct nfs_write_data *data, 337 const struct rpc_call_ops *call_ops, 338 int how); 339 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 340 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 341 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 342 struct nfs_commit_data *data, 343 const struct rpc_call_ops *call_ops, 344 int how); 345 extern void nfs_init_commit(struct nfs_commit_data *data, 346 struct list_head *head, 347 struct pnfs_layout_segment *lseg, 348 struct nfs_commit_info *cinfo); 349 void nfs_retry_commit(struct list_head *page_list, 350 struct pnfs_layout_segment *lseg, 351 struct nfs_commit_info *cinfo); 352 void nfs_commitdata_release(struct nfs_commit_data *data); 353 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 354 struct nfs_commit_info *cinfo); 355 void nfs_request_remove_commit_list(struct nfs_page *req, 356 struct nfs_commit_info *cinfo); 357 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 358 struct inode *inode, 359 struct nfs_direct_req *dreq); 360 361 #ifdef CONFIG_MIGRATION 362 extern int nfs_migrate_page(struct address_space *, 363 struct page *, struct page *, enum migrate_mode); 364 #else 365 #define nfs_migrate_page NULL 366 #endif 367 368 /* nfs4proc.c */ 369 extern void __nfs4_read_done_cb(struct nfs_read_data *); 370 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data); 371 extern int nfs4_init_client(struct nfs_client *clp, 372 const struct rpc_timeout *timeparms, 373 const char *ip_addr, 374 rpc_authflavor_t authflavour, 375 int noresvport); 376 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data); 377 extern int _nfs4_call_sync(struct rpc_clnt *clnt, 378 struct nfs_server *server, 379 struct rpc_message *msg, 380 struct nfs4_sequence_args *args, 381 struct nfs4_sequence_res *res, 382 int cache_reply); 383 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt, 384 struct nfs_server *server, 385 struct rpc_message *msg, 386 struct nfs4_sequence_args *args, 387 struct nfs4_sequence_res *res, 388 int cache_reply); 389 390 /* 391 * Determine the device name as a string 392 */ 393 static inline char *nfs_devname(struct dentry *dentry, 394 char *buffer, ssize_t buflen) 395 { 396 char *dummy; 397 return nfs_path(&dummy, dentry, buffer, buflen); 398 } 399 400 /* 401 * Determine the actual block size (and log2 thereof) 402 */ 403 static inline 404 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 405 { 406 /* make sure blocksize is a power of two */ 407 if ((bsize & (bsize - 1)) || nrbitsp) { 408 unsigned char nrbits; 409 410 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 411 ; 412 bsize = 1 << nrbits; 413 if (nrbitsp) 414 *nrbitsp = nrbits; 415 } 416 417 return bsize; 418 } 419 420 /* 421 * Calculate the number of 512byte blocks used. 422 */ 423 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 424 { 425 blkcnt_t used = (tsize + 511) >> 9; 426 return (used > ULONG_MAX) ? ULONG_MAX : used; 427 } 428 429 /* 430 * Compute and set NFS server blocksize 431 */ 432 static inline 433 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 434 { 435 if (bsize < NFS_MIN_FILE_IO_SIZE) 436 bsize = NFS_DEF_FILE_IO_SIZE; 437 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 438 bsize = NFS_MAX_FILE_IO_SIZE; 439 440 return nfs_block_bits(bsize, nrbitsp); 441 } 442 443 /* 444 * Determine the maximum file size for a superblock 445 */ 446 static inline 447 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 448 { 449 sb->s_maxbytes = (loff_t)maxfilesize; 450 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 451 sb->s_maxbytes = MAX_LFS_FILESIZE; 452 } 453 454 /* 455 * Determine the number of bytes of data the page contains 456 */ 457 static inline 458 unsigned int nfs_page_length(struct page *page) 459 { 460 loff_t i_size = i_size_read(page->mapping->host); 461 462 if (i_size > 0) { 463 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 464 if (page->index < end_index) 465 return PAGE_CACHE_SIZE; 466 if (page->index == end_index) 467 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 468 } 469 return 0; 470 } 471 472 /* 473 * Convert a umode to a dirent->d_type 474 */ 475 static inline 476 unsigned char nfs_umode_to_dtype(umode_t mode) 477 { 478 return (mode >> 12) & 15; 479 } 480 481 /* 482 * Determine the number of pages in an array of length 'len' and 483 * with a base offset of 'base' 484 */ 485 static inline 486 unsigned int nfs_page_array_len(unsigned int base, size_t len) 487 { 488 return ((unsigned long)len + (unsigned long)base + 489 PAGE_SIZE - 1) >> PAGE_SHIFT; 490 } 491 492