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 struct nfs_clone_mount { 43 const struct super_block *sb; 44 const struct dentry *dentry; 45 struct nfs_fh *fh; 46 struct nfs_fattr *fattr; 47 char *hostname; 48 char *mnt_path; 49 struct sockaddr *addr; 50 size_t addrlen; 51 rpc_authflavor_t authflavor; 52 }; 53 54 /* 55 * Note: RFC 1813 doesn't limit the number of auth flavors that 56 * a server can return, so make something up. 57 */ 58 #define NFS_MAX_SECFLAVORS (12) 59 60 /* 61 * Value used if the user did not specify a port value. 62 */ 63 #define NFS_UNSPEC_PORT (-1) 64 65 /* 66 * Maximum number of pages that readdir can use for creating 67 * a vmapped array of pages. 68 */ 69 #define NFS_MAX_READDIR_PAGES 8 70 71 /* 72 * In-kernel mount arguments 73 */ 74 struct nfs_parsed_mount_data { 75 int flags; 76 int rsize, wsize; 77 int timeo, retrans; 78 int acregmin, acregmax, 79 acdirmin, acdirmax; 80 int namlen; 81 unsigned int options; 82 unsigned int bsize; 83 unsigned int auth_flavor_len; 84 rpc_authflavor_t auth_flavors[1]; 85 char *client_address; 86 unsigned int version; 87 unsigned int minorversion; 88 char *fscache_uniq; 89 90 struct { 91 struct sockaddr_storage address; 92 size_t addrlen; 93 char *hostname; 94 u32 version; 95 int port; 96 unsigned short protocol; 97 } mount_server; 98 99 struct { 100 struct sockaddr_storage address; 101 size_t addrlen; 102 char *hostname; 103 char *export_path; 104 int port; 105 unsigned short protocol; 106 } nfs_server; 107 108 struct security_mnt_opts lsm_opts; 109 }; 110 111 /* mount_clnt.c */ 112 struct nfs_mount_request { 113 struct sockaddr *sap; 114 size_t salen; 115 char *hostname; 116 char *dirpath; 117 u32 version; 118 unsigned short protocol; 119 struct nfs_fh *fh; 120 int noresvport; 121 unsigned int *auth_flav_len; 122 rpc_authflavor_t *auth_flavs; 123 }; 124 125 extern int nfs_mount(struct nfs_mount_request *info); 126 extern void nfs_umount(const struct nfs_mount_request *info); 127 128 /* client.c */ 129 extern struct rpc_program nfs_program; 130 131 extern void nfs_cleanup_cb_ident_idr(void); 132 extern void nfs_put_client(struct nfs_client *); 133 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *); 134 extern struct nfs_client *nfs4_find_client_ident(int); 135 extern struct nfs_client * 136 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *); 137 extern struct nfs_server *nfs_create_server( 138 const struct nfs_parsed_mount_data *, 139 struct nfs_fh *); 140 extern struct nfs_server *nfs4_create_server( 141 const struct nfs_parsed_mount_data *, 142 struct nfs_fh *); 143 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 144 struct nfs_fh *); 145 extern void nfs_free_server(struct nfs_server *server); 146 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 147 struct nfs_fh *, 148 struct nfs_fattr *); 149 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 150 extern int nfs4_check_client_ready(struct nfs_client *clp); 151 #ifdef CONFIG_PROC_FS 152 extern int __init nfs_fs_proc_init(void); 153 extern void nfs_fs_proc_exit(void); 154 #else 155 static inline int nfs_fs_proc_init(void) 156 { 157 return 0; 158 } 159 static inline void nfs_fs_proc_exit(void) 160 { 161 } 162 #endif 163 164 /* nfs4namespace.c */ 165 #ifdef CONFIG_NFS_V4 166 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 167 #else 168 static inline 169 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 170 { 171 return ERR_PTR(-ENOENT); 172 } 173 #endif 174 175 /* callback_xdr.c */ 176 extern struct svc_version nfs4_callback_version1; 177 extern struct svc_version nfs4_callback_version4; 178 179 /* pagelist.c */ 180 extern int __init nfs_init_nfspagecache(void); 181 extern void nfs_destroy_nfspagecache(void); 182 extern int __init nfs_init_readpagecache(void); 183 extern void nfs_destroy_readpagecache(void); 184 extern int __init nfs_init_writepagecache(void); 185 extern void nfs_destroy_writepagecache(void); 186 187 extern int __init nfs_init_directcache(void); 188 extern void nfs_destroy_directcache(void); 189 190 /* nfs2xdr.c */ 191 extern int nfs_stat_to_errno(enum nfs_stat); 192 extern struct rpc_procinfo nfs_procedures[]; 193 extern int nfs2_decode_dirent(struct xdr_stream *, 194 struct nfs_entry *, int); 195 196 /* nfs3xdr.c */ 197 extern struct rpc_procinfo nfs3_procedures[]; 198 extern int nfs3_decode_dirent(struct xdr_stream *, 199 struct nfs_entry *, int); 200 201 /* nfs4xdr.c */ 202 #ifdef CONFIG_NFS_V4 203 extern int nfs4_decode_dirent(struct xdr_stream *, 204 struct nfs_entry *, int); 205 #endif 206 #ifdef CONFIG_NFS_V4_1 207 extern const u32 nfs41_maxread_overhead; 208 extern const u32 nfs41_maxwrite_overhead; 209 #endif 210 211 /* nfs4proc.c */ 212 #ifdef CONFIG_NFS_V4 213 extern struct rpc_procinfo nfs4_procedures[]; 214 #endif 215 216 /* proc.c */ 217 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 218 219 /* dir.c */ 220 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 221 int nr_to_scan, gfp_t gfp_mask); 222 223 /* inode.c */ 224 extern struct workqueue_struct *nfsiod_workqueue; 225 extern struct inode *nfs_alloc_inode(struct super_block *sb); 226 extern void nfs_destroy_inode(struct inode *); 227 extern int nfs_write_inode(struct inode *, struct writeback_control *); 228 extern void nfs_evict_inode(struct inode *); 229 #ifdef CONFIG_NFS_V4 230 extern void nfs4_evict_inode(struct inode *); 231 #endif 232 void nfs_zap_acl_cache(struct inode *inode); 233 extern int nfs_wait_bit_killable(void *word); 234 235 /* super.c */ 236 extern struct file_system_type nfs_xdev_fs_type; 237 #ifdef CONFIG_NFS_V4 238 extern struct file_system_type nfs4_xdev_fs_type; 239 extern struct file_system_type nfs4_referral_fs_type; 240 #endif 241 242 extern struct rpc_stat nfs_rpcstat; 243 244 extern int __init register_nfs_fs(void); 245 extern void __exit unregister_nfs_fs(void); 246 extern void nfs_sb_active(struct super_block *sb); 247 extern void nfs_sb_deactive(struct super_block *sb); 248 249 /* namespace.c */ 250 extern char *nfs_path(const char *base, 251 const struct dentry *droot, 252 const struct dentry *dentry, 253 char *buffer, ssize_t buflen); 254 extern struct vfsmount *nfs_d_automount(struct path *path); 255 256 /* getroot.c */ 257 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 258 #ifdef CONFIG_NFS_V4 259 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 260 261 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 262 #endif 263 264 /* read.c */ 265 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 266 267 /* write.c */ 268 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 269 #ifdef CONFIG_MIGRATION 270 extern int nfs_migrate_page(struct address_space *, 271 struct page *, struct page *); 272 #else 273 #define nfs_migrate_page NULL 274 #endif 275 276 /* nfs4proc.c */ 277 extern int _nfs4_call_sync(struct nfs_server *server, 278 struct rpc_message *msg, 279 struct nfs4_sequence_args *args, 280 struct nfs4_sequence_res *res, 281 int cache_reply); 282 extern int _nfs4_call_sync_session(struct nfs_server *server, 283 struct rpc_message *msg, 284 struct nfs4_sequence_args *args, 285 struct nfs4_sequence_res *res, 286 int cache_reply); 287 288 /* 289 * Determine the device name as a string 290 */ 291 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 292 const struct dentry *dentry, 293 char *buffer, ssize_t buflen) 294 { 295 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 296 dentry, buffer, buflen); 297 } 298 299 /* 300 * Determine the actual block size (and log2 thereof) 301 */ 302 static inline 303 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 304 { 305 /* make sure blocksize is a power of two */ 306 if ((bsize & (bsize - 1)) || nrbitsp) { 307 unsigned char nrbits; 308 309 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 310 ; 311 bsize = 1 << nrbits; 312 if (nrbitsp) 313 *nrbitsp = nrbits; 314 } 315 316 return bsize; 317 } 318 319 /* 320 * Calculate the number of 512byte blocks used. 321 */ 322 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 323 { 324 blkcnt_t used = (tsize + 511) >> 9; 325 return (used > ULONG_MAX) ? ULONG_MAX : used; 326 } 327 328 /* 329 * Compute and set NFS server blocksize 330 */ 331 static inline 332 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 333 { 334 if (bsize < NFS_MIN_FILE_IO_SIZE) 335 bsize = NFS_DEF_FILE_IO_SIZE; 336 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 337 bsize = NFS_MAX_FILE_IO_SIZE; 338 339 return nfs_block_bits(bsize, nrbitsp); 340 } 341 342 /* 343 * Determine the maximum file size for a superblock 344 */ 345 static inline 346 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 347 { 348 sb->s_maxbytes = (loff_t)maxfilesize; 349 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 350 sb->s_maxbytes = MAX_LFS_FILESIZE; 351 } 352 353 /* 354 * Determine the number of bytes of data the page contains 355 */ 356 static inline 357 unsigned int nfs_page_length(struct page *page) 358 { 359 loff_t i_size = i_size_read(page->mapping->host); 360 361 if (i_size > 0) { 362 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 363 if (page->index < end_index) 364 return PAGE_CACHE_SIZE; 365 if (page->index == end_index) 366 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 367 } 368 return 0; 369 } 370 371 /* 372 * Convert a umode to a dirent->d_type 373 */ 374 static inline 375 unsigned char nfs_umode_to_dtype(umode_t mode) 376 { 377 return (mode >> 12) & 15; 378 } 379 380 /* 381 * Determine the number of pages in an array of length 'len' and 382 * with a base offset of 'base' 383 */ 384 static inline 385 unsigned int nfs_page_array_len(unsigned int base, size_t len) 386 { 387 return ((unsigned long)len + (unsigned long)base + 388 PAGE_SIZE - 1) >> PAGE_SHIFT; 389 } 390 391 /* 392 * Helper for restarting RPC calls in the possible presence of NFSv4.1 393 * sessions. 394 */ 395 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp) 396 { 397 if (nfs4_has_session(clp)) 398 return rpc_restart_call_prepare(task); 399 return rpc_restart_call(task); 400 } 401