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