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 /* pagelist.c */ 204 extern int __init nfs_init_nfspagecache(void); 205 extern void nfs_destroy_nfspagecache(void); 206 extern int __init nfs_init_readpagecache(void); 207 extern void nfs_destroy_readpagecache(void); 208 extern int __init nfs_init_writepagecache(void); 209 extern void nfs_destroy_writepagecache(void); 210 211 extern int __init nfs_init_directcache(void); 212 extern void nfs_destroy_directcache(void); 213 214 /* nfs2xdr.c */ 215 extern int nfs_stat_to_errno(enum nfs_stat); 216 extern struct rpc_procinfo nfs_procedures[]; 217 extern int nfs2_decode_dirent(struct xdr_stream *, 218 struct nfs_entry *, int); 219 220 /* nfs3xdr.c */ 221 extern struct rpc_procinfo nfs3_procedures[]; 222 extern int nfs3_decode_dirent(struct xdr_stream *, 223 struct nfs_entry *, int); 224 225 /* nfs4xdr.c */ 226 #ifdef CONFIG_NFS_V4 227 extern int nfs4_decode_dirent(struct xdr_stream *, 228 struct nfs_entry *, int); 229 #endif 230 #ifdef CONFIG_NFS_V4_1 231 extern const u32 nfs41_maxread_overhead; 232 extern const u32 nfs41_maxwrite_overhead; 233 #endif 234 235 /* nfs4proc.c */ 236 #ifdef CONFIG_NFS_V4 237 extern struct rpc_procinfo nfs4_procedures[]; 238 #endif 239 240 extern int nfs4_init_ds_session(struct nfs_client *clp); 241 242 /* proc.c */ 243 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 244 extern int nfs_init_client(struct nfs_client *clp, 245 const struct rpc_timeout *timeparms, 246 const char *ip_addr, rpc_authflavor_t authflavour, 247 int noresvport); 248 249 /* dir.c */ 250 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 251 struct shrink_control *sc); 252 253 /* inode.c */ 254 extern struct workqueue_struct *nfsiod_workqueue; 255 extern struct inode *nfs_alloc_inode(struct super_block *sb); 256 extern void nfs_destroy_inode(struct inode *); 257 extern int nfs_write_inode(struct inode *, struct writeback_control *); 258 extern void nfs_evict_inode(struct inode *); 259 #ifdef CONFIG_NFS_V4 260 extern void nfs4_evict_inode(struct inode *); 261 #endif 262 void nfs_zap_acl_cache(struct inode *inode); 263 extern int nfs_wait_bit_killable(void *word); 264 265 /* super.c */ 266 extern struct file_system_type nfs_xdev_fs_type; 267 #ifdef CONFIG_NFS_V4 268 extern struct file_system_type nfs4_xdev_fs_type; 269 extern struct file_system_type nfs4_referral_fs_type; 270 #endif 271 272 extern struct rpc_stat nfs_rpcstat; 273 274 extern int __init register_nfs_fs(void); 275 extern void __exit unregister_nfs_fs(void); 276 extern void nfs_sb_active(struct super_block *sb); 277 extern void nfs_sb_deactive(struct super_block *sb); 278 279 /* namespace.c */ 280 extern char *nfs_path(char **p, struct dentry *dentry, 281 char *buffer, ssize_t buflen); 282 extern struct vfsmount *nfs_d_automount(struct path *path); 283 #ifdef CONFIG_NFS_V4 284 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *); 285 #endif 286 287 /* getroot.c */ 288 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 289 const char *); 290 #ifdef CONFIG_NFS_V4 291 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 292 const char *); 293 294 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 295 #endif 296 297 struct nfs_pageio_descriptor; 298 /* read.c */ 299 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt, 300 const struct rpc_call_ops *call_ops); 301 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 302 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 303 struct list_head *head); 304 305 extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio, 306 struct inode *inode); 307 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 308 extern void nfs_readdata_release(struct nfs_read_data *rdata); 309 310 /* write.c */ 311 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 312 struct list_head *head); 313 extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio, 314 struct inode *inode, int ioflags); 315 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 316 extern void nfs_writedata_release(struct nfs_write_data *wdata); 317 extern void nfs_commit_free(struct nfs_write_data *p); 318 extern int nfs_initiate_write(struct nfs_write_data *data, 319 struct rpc_clnt *clnt, 320 const struct rpc_call_ops *call_ops, 321 int how); 322 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 323 extern int nfs_initiate_commit(struct nfs_write_data *data, 324 struct rpc_clnt *clnt, 325 const struct rpc_call_ops *call_ops, 326 int how); 327 extern void nfs_init_commit(struct nfs_write_data *data, 328 struct list_head *head, 329 struct pnfs_layout_segment *lseg); 330 void nfs_retry_commit(struct list_head *page_list, 331 struct pnfs_layout_segment *lseg); 332 void nfs_commit_clear_lock(struct nfs_inode *nfsi); 333 void nfs_commitdata_release(void *data); 334 void nfs_commit_release_pages(struct nfs_write_data *data); 335 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *head); 336 void nfs_request_remove_commit_list(struct nfs_page *req); 337 338 #ifdef CONFIG_MIGRATION 339 extern int nfs_migrate_page(struct address_space *, 340 struct page *, struct page *, enum migrate_mode); 341 #else 342 #define nfs_migrate_page NULL 343 #endif 344 345 /* nfs4proc.c */ 346 extern void __nfs4_read_done_cb(struct nfs_read_data *); 347 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data); 348 extern int nfs4_init_client(struct nfs_client *clp, 349 const struct rpc_timeout *timeparms, 350 const char *ip_addr, 351 rpc_authflavor_t authflavour, 352 int noresvport); 353 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data); 354 extern int _nfs4_call_sync(struct rpc_clnt *clnt, 355 struct nfs_server *server, 356 struct rpc_message *msg, 357 struct nfs4_sequence_args *args, 358 struct nfs4_sequence_res *res, 359 int cache_reply); 360 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt, 361 struct nfs_server *server, 362 struct rpc_message *msg, 363 struct nfs4_sequence_args *args, 364 struct nfs4_sequence_res *res, 365 int cache_reply); 366 367 /* 368 * Determine the device name as a string 369 */ 370 static inline char *nfs_devname(struct dentry *dentry, 371 char *buffer, ssize_t buflen) 372 { 373 char *dummy; 374 return nfs_path(&dummy, dentry, buffer, buflen); 375 } 376 377 /* 378 * Determine the actual block size (and log2 thereof) 379 */ 380 static inline 381 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 382 { 383 /* make sure blocksize is a power of two */ 384 if ((bsize & (bsize - 1)) || nrbitsp) { 385 unsigned char nrbits; 386 387 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 388 ; 389 bsize = 1 << nrbits; 390 if (nrbitsp) 391 *nrbitsp = nrbits; 392 } 393 394 return bsize; 395 } 396 397 /* 398 * Calculate the number of 512byte blocks used. 399 */ 400 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 401 { 402 blkcnt_t used = (tsize + 511) >> 9; 403 return (used > ULONG_MAX) ? ULONG_MAX : used; 404 } 405 406 /* 407 * Compute and set NFS server blocksize 408 */ 409 static inline 410 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 411 { 412 if (bsize < NFS_MIN_FILE_IO_SIZE) 413 bsize = NFS_DEF_FILE_IO_SIZE; 414 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 415 bsize = NFS_MAX_FILE_IO_SIZE; 416 417 return nfs_block_bits(bsize, nrbitsp); 418 } 419 420 /* 421 * Determine the maximum file size for a superblock 422 */ 423 static inline 424 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 425 { 426 sb->s_maxbytes = (loff_t)maxfilesize; 427 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 428 sb->s_maxbytes = MAX_LFS_FILESIZE; 429 } 430 431 /* 432 * Determine the number of bytes of data the page contains 433 */ 434 static inline 435 unsigned int nfs_page_length(struct page *page) 436 { 437 loff_t i_size = i_size_read(page->mapping->host); 438 439 if (i_size > 0) { 440 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 441 if (page->index < end_index) 442 return PAGE_CACHE_SIZE; 443 if (page->index == end_index) 444 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 445 } 446 return 0; 447 } 448 449 /* 450 * Convert a umode to a dirent->d_type 451 */ 452 static inline 453 unsigned char nfs_umode_to_dtype(umode_t mode) 454 { 455 return (mode >> 12) & 15; 456 } 457 458 /* 459 * Determine the number of pages in an array of length 'len' and 460 * with a base offset of 'base' 461 */ 462 static inline 463 unsigned int nfs_page_array_len(unsigned int base, size_t len) 464 { 465 return ((unsigned long)len + (unsigned long)base + 466 PAGE_SIZE - 1) >> PAGE_SHIFT; 467 } 468 469