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 }; 127 128 /* mount_clnt.c */ 129 struct nfs_mount_request { 130 struct sockaddr *sap; 131 size_t salen; 132 char *hostname; 133 char *dirpath; 134 u32 version; 135 unsigned short protocol; 136 struct nfs_fh *fh; 137 int noresvport; 138 unsigned int *auth_flav_len; 139 rpc_authflavor_t *auth_flavs; 140 }; 141 142 extern int nfs_mount(struct nfs_mount_request *info); 143 extern void nfs_umount(const struct nfs_mount_request *info); 144 145 /* client.c */ 146 extern struct rpc_program nfs_program; 147 148 extern void nfs_cleanup_cb_ident_idr(void); 149 extern void nfs_put_client(struct nfs_client *); 150 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *); 151 extern struct nfs_client *nfs4_find_client_ident(int); 152 extern struct nfs_client * 153 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *); 154 extern struct nfs_server *nfs_create_server( 155 const struct nfs_parsed_mount_data *, 156 struct nfs_fh *); 157 extern struct nfs_server *nfs4_create_server( 158 const struct nfs_parsed_mount_data *, 159 struct nfs_fh *); 160 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 161 struct nfs_fh *); 162 extern void nfs_free_server(struct nfs_server *server); 163 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 164 struct nfs_fh *, 165 struct nfs_fattr *); 166 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 167 extern int nfs4_check_client_ready(struct nfs_client *clp); 168 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 169 const struct sockaddr *ds_addr, 170 int ds_addrlen, int ds_proto); 171 #ifdef CONFIG_PROC_FS 172 extern int __init nfs_fs_proc_init(void); 173 extern void nfs_fs_proc_exit(void); 174 #else 175 static inline int nfs_fs_proc_init(void) 176 { 177 return 0; 178 } 179 static inline void nfs_fs_proc_exit(void) 180 { 181 } 182 #endif 183 184 /* nfs4namespace.c */ 185 #ifdef CONFIG_NFS_V4 186 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry); 187 #else 188 static inline 189 struct vfsmount *nfs_do_refmount(struct dentry *dentry) 190 { 191 return ERR_PTR(-ENOENT); 192 } 193 #endif 194 195 /* callback_xdr.c */ 196 extern struct svc_version nfs4_callback_version1; 197 extern struct svc_version nfs4_callback_version4; 198 199 /* pagelist.c */ 200 extern int __init nfs_init_nfspagecache(void); 201 extern void nfs_destroy_nfspagecache(void); 202 extern int __init nfs_init_readpagecache(void); 203 extern void nfs_destroy_readpagecache(void); 204 extern int __init nfs_init_writepagecache(void); 205 extern void nfs_destroy_writepagecache(void); 206 207 extern int __init nfs_init_directcache(void); 208 extern void nfs_destroy_directcache(void); 209 210 /* nfs2xdr.c */ 211 extern int nfs_stat_to_errno(enum nfs_stat); 212 extern struct rpc_procinfo nfs_procedures[]; 213 extern int nfs2_decode_dirent(struct xdr_stream *, 214 struct nfs_entry *, int); 215 216 /* nfs3xdr.c */ 217 extern struct rpc_procinfo nfs3_procedures[]; 218 extern int nfs3_decode_dirent(struct xdr_stream *, 219 struct nfs_entry *, int); 220 221 /* nfs4xdr.c */ 222 #ifdef CONFIG_NFS_V4 223 extern int nfs4_decode_dirent(struct xdr_stream *, 224 struct nfs_entry *, int); 225 #endif 226 #ifdef CONFIG_NFS_V4_1 227 extern const u32 nfs41_maxread_overhead; 228 extern const u32 nfs41_maxwrite_overhead; 229 #endif 230 231 /* nfs4proc.c */ 232 #ifdef CONFIG_NFS_V4 233 extern struct rpc_procinfo nfs4_procedures[]; 234 void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *); 235 #endif 236 237 extern int nfs4_init_ds_session(struct nfs_client *clp); 238 239 /* proc.c */ 240 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 241 extern int nfs_init_client(struct nfs_client *clp, 242 const struct rpc_timeout *timeparms, 243 const char *ip_addr, rpc_authflavor_t authflavour, 244 int noresvport); 245 246 /* dir.c */ 247 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 248 struct shrink_control *sc); 249 250 /* inode.c */ 251 extern struct workqueue_struct *nfsiod_workqueue; 252 extern struct inode *nfs_alloc_inode(struct super_block *sb); 253 extern void nfs_destroy_inode(struct inode *); 254 extern int nfs_write_inode(struct inode *, struct writeback_control *); 255 extern void nfs_evict_inode(struct inode *); 256 #ifdef CONFIG_NFS_V4 257 extern void nfs4_evict_inode(struct inode *); 258 #endif 259 void nfs_zap_acl_cache(struct inode *inode); 260 extern int nfs_wait_bit_killable(void *word); 261 262 /* super.c */ 263 extern struct file_system_type nfs_xdev_fs_type; 264 #ifdef CONFIG_NFS_V4 265 extern struct file_system_type nfs4_xdev_fs_type; 266 extern struct file_system_type nfs4_referral_fs_type; 267 #endif 268 269 extern struct rpc_stat nfs_rpcstat; 270 271 extern int __init register_nfs_fs(void); 272 extern void __exit unregister_nfs_fs(void); 273 extern void nfs_sb_active(struct super_block *sb); 274 extern void nfs_sb_deactive(struct super_block *sb); 275 276 /* namespace.c */ 277 extern char *nfs_path(char **p, struct dentry *dentry, 278 char *buffer, ssize_t buflen); 279 extern struct vfsmount *nfs_d_automount(struct path *path); 280 #ifdef CONFIG_NFS_V4 281 rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *); 282 #endif 283 284 /* getroot.c */ 285 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 286 const char *); 287 #ifdef CONFIG_NFS_V4 288 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 289 const char *); 290 291 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 292 #endif 293 294 struct nfs_pageio_descriptor; 295 /* read.c */ 296 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt, 297 const struct rpc_call_ops *call_ops); 298 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 299 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 300 struct list_head *head); 301 302 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 303 extern void nfs_readdata_release(struct nfs_read_data *rdata); 304 305 /* write.c */ 306 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 307 struct list_head *head); 308 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 309 extern void nfs_writedata_release(struct nfs_write_data *wdata); 310 extern void nfs_commit_free(struct nfs_write_data *p); 311 extern int nfs_initiate_write(struct nfs_write_data *data, 312 struct rpc_clnt *clnt, 313 const struct rpc_call_ops *call_ops, 314 int how); 315 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 316 extern int nfs_initiate_commit(struct nfs_write_data *data, 317 struct rpc_clnt *clnt, 318 const struct rpc_call_ops *call_ops, 319 int how); 320 extern void nfs_init_commit(struct nfs_write_data *data, 321 struct list_head *head, 322 struct pnfs_layout_segment *lseg); 323 void nfs_retry_commit(struct list_head *page_list, 324 struct pnfs_layout_segment *lseg); 325 void nfs_commit_clear_lock(struct nfs_inode *nfsi); 326 void nfs_commitdata_release(void *data); 327 void nfs_commit_release_pages(struct nfs_write_data *data); 328 329 #ifdef CONFIG_MIGRATION 330 extern int nfs_migrate_page(struct address_space *, 331 struct page *, struct page *); 332 #else 333 #define nfs_migrate_page NULL 334 #endif 335 336 /* nfs4proc.c */ 337 extern void __nfs4_read_done_cb(struct nfs_read_data *); 338 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data); 339 extern int nfs4_init_client(struct nfs_client *clp, 340 const struct rpc_timeout *timeparms, 341 const char *ip_addr, 342 rpc_authflavor_t authflavour, 343 int noresvport); 344 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data); 345 extern int _nfs4_call_sync(struct rpc_clnt *clnt, 346 struct nfs_server *server, 347 struct rpc_message *msg, 348 struct nfs4_sequence_args *args, 349 struct nfs4_sequence_res *res, 350 int cache_reply); 351 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt, 352 struct nfs_server *server, 353 struct rpc_message *msg, 354 struct nfs4_sequence_args *args, 355 struct nfs4_sequence_res *res, 356 int cache_reply); 357 358 /* 359 * Determine the device name as a string 360 */ 361 static inline char *nfs_devname(struct dentry *dentry, 362 char *buffer, ssize_t buflen) 363 { 364 char *dummy; 365 return nfs_path(&dummy, dentry, buffer, buflen); 366 } 367 368 /* 369 * Determine the actual block size (and log2 thereof) 370 */ 371 static inline 372 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 373 { 374 /* make sure blocksize is a power of two */ 375 if ((bsize & (bsize - 1)) || nrbitsp) { 376 unsigned char nrbits; 377 378 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 379 ; 380 bsize = 1 << nrbits; 381 if (nrbitsp) 382 *nrbitsp = nrbits; 383 } 384 385 return bsize; 386 } 387 388 /* 389 * Calculate the number of 512byte blocks used. 390 */ 391 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 392 { 393 blkcnt_t used = (tsize + 511) >> 9; 394 return (used > ULONG_MAX) ? ULONG_MAX : used; 395 } 396 397 /* 398 * Compute and set NFS server blocksize 399 */ 400 static inline 401 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 402 { 403 if (bsize < NFS_MIN_FILE_IO_SIZE) 404 bsize = NFS_DEF_FILE_IO_SIZE; 405 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 406 bsize = NFS_MAX_FILE_IO_SIZE; 407 408 return nfs_block_bits(bsize, nrbitsp); 409 } 410 411 /* 412 * Determine the maximum file size for a superblock 413 */ 414 static inline 415 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 416 { 417 sb->s_maxbytes = (loff_t)maxfilesize; 418 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 419 sb->s_maxbytes = MAX_LFS_FILESIZE; 420 } 421 422 /* 423 * Determine the number of bytes of data the page contains 424 */ 425 static inline 426 unsigned int nfs_page_length(struct page *page) 427 { 428 loff_t i_size = i_size_read(page->mapping->host); 429 430 if (i_size > 0) { 431 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 432 if (page->index < end_index) 433 return PAGE_CACHE_SIZE; 434 if (page->index == end_index) 435 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 436 } 437 return 0; 438 } 439 440 /* 441 * Convert a umode to a dirent->d_type 442 */ 443 static inline 444 unsigned char nfs_umode_to_dtype(umode_t mode) 445 { 446 return (mode >> 12) & 15; 447 } 448 449 /* 450 * Determine the number of pages in an array of length 'len' and 451 * with a base offset of 'base' 452 */ 453 static inline 454 unsigned int nfs_page_array_len(unsigned int base, size_t len) 455 { 456 return ((unsigned long)len + (unsigned long)base + 457 PAGE_SIZE - 1) >> PAGE_SHIFT; 458 } 459 460 /* 461 * Helper for restarting RPC calls in the possible presence of NFSv4.1 462 * sessions. 463 */ 464 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp) 465 { 466 if (nfs4_has_session(clp)) 467 return rpc_restart_call_prepare(task); 468 return rpc_restart_call(task); 469 } 470