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 struct nfs_clone_mount { 34 const struct super_block *sb; 35 const struct dentry *dentry; 36 struct nfs_fh *fh; 37 struct nfs_fattr *fattr; 38 char *hostname; 39 char *mnt_path; 40 struct sockaddr *addr; 41 size_t addrlen; 42 rpc_authflavor_t authflavor; 43 }; 44 45 /* 46 * Note: RFC 1813 doesn't limit the number of auth flavors that 47 * a server can return, so make something up. 48 */ 49 #define NFS_MAX_SECFLAVORS (12) 50 51 /* 52 * In-kernel mount arguments 53 */ 54 struct nfs_parsed_mount_data { 55 int flags; 56 int rsize, wsize; 57 int timeo, retrans; 58 int acregmin, acregmax, 59 acdirmin, acdirmax; 60 int namlen; 61 unsigned int options; 62 unsigned int bsize; 63 unsigned int auth_flavor_len; 64 rpc_authflavor_t auth_flavors[1]; 65 char *client_address; 66 unsigned int minorversion; 67 char *fscache_uniq; 68 69 struct { 70 struct sockaddr_storage address; 71 size_t addrlen; 72 char *hostname; 73 u32 version; 74 unsigned short port; 75 unsigned short protocol; 76 } mount_server; 77 78 struct { 79 struct sockaddr_storage address; 80 size_t addrlen; 81 char *hostname; 82 char *export_path; 83 unsigned short port; 84 unsigned short protocol; 85 } nfs_server; 86 87 struct security_mnt_opts lsm_opts; 88 }; 89 90 /* mount_clnt.c */ 91 struct nfs_mount_request { 92 struct sockaddr *sap; 93 size_t salen; 94 char *hostname; 95 char *dirpath; 96 u32 version; 97 unsigned short protocol; 98 struct nfs_fh *fh; 99 int noresvport; 100 unsigned int *auth_flav_len; 101 rpc_authflavor_t *auth_flavs; 102 }; 103 104 extern int nfs_mount(struct nfs_mount_request *info); 105 106 /* client.c */ 107 extern struct rpc_program nfs_program; 108 109 extern void nfs_put_client(struct nfs_client *); 110 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 111 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 112 extern struct nfs_server *nfs_create_server( 113 const struct nfs_parsed_mount_data *, 114 struct nfs_fh *); 115 extern struct nfs_server *nfs4_create_server( 116 const struct nfs_parsed_mount_data *, 117 struct nfs_fh *); 118 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 119 struct nfs_fh *); 120 extern void nfs_free_server(struct nfs_server *server); 121 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 122 struct nfs_fh *, 123 struct nfs_fattr *); 124 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 125 extern int nfs4_check_client_ready(struct nfs_client *clp); 126 #ifdef CONFIG_PROC_FS 127 extern int __init nfs_fs_proc_init(void); 128 extern void nfs_fs_proc_exit(void); 129 #else 130 static inline int nfs_fs_proc_init(void) 131 { 132 return 0; 133 } 134 static inline void nfs_fs_proc_exit(void) 135 { 136 } 137 #endif 138 139 /* nfs4namespace.c */ 140 #ifdef CONFIG_NFS_V4 141 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 142 #else 143 static inline 144 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 145 { 146 return ERR_PTR(-ENOENT); 147 } 148 #endif 149 150 /* callback_xdr.c */ 151 extern struct svc_version nfs4_callback_version1; 152 153 /* pagelist.c */ 154 extern int __init nfs_init_nfspagecache(void); 155 extern void nfs_destroy_nfspagecache(void); 156 extern int __init nfs_init_readpagecache(void); 157 extern void nfs_destroy_readpagecache(void); 158 extern int __init nfs_init_writepagecache(void); 159 extern void nfs_destroy_writepagecache(void); 160 161 extern int __init nfs_init_directcache(void); 162 extern void nfs_destroy_directcache(void); 163 164 /* nfs2xdr.c */ 165 extern int nfs_stat_to_errno(int); 166 extern struct rpc_procinfo nfs_procedures[]; 167 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 168 169 /* nfs3xdr.c */ 170 extern struct rpc_procinfo nfs3_procedures[]; 171 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 172 173 /* nfs4proc.c */ 174 static inline void nfs4_restart_rpc(struct rpc_task *task, 175 const struct nfs_client *clp) 176 { 177 #ifdef CONFIG_NFS_V4_1 178 if (nfs4_has_session(clp) && 179 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { 180 rpc_restart_call_prepare(task); 181 return; 182 } 183 #endif /* CONFIG_NFS_V4_1 */ 184 rpc_restart_call(task); 185 } 186 187 /* nfs4xdr.c */ 188 #ifdef CONFIG_NFS_V4 189 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 190 #endif 191 192 /* nfs4proc.c */ 193 #ifdef CONFIG_NFS_V4 194 extern struct rpc_procinfo nfs4_procedures[]; 195 #endif 196 197 /* proc.c */ 198 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 199 200 /* dir.c */ 201 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 202 203 /* inode.c */ 204 extern struct workqueue_struct *nfsiod_workqueue; 205 extern struct inode *nfs_alloc_inode(struct super_block *sb); 206 extern void nfs_destroy_inode(struct inode *); 207 extern int nfs_write_inode(struct inode *,int); 208 extern void nfs_clear_inode(struct inode *); 209 #ifdef CONFIG_NFS_V4 210 extern void nfs4_clear_inode(struct inode *); 211 #endif 212 void nfs_zap_acl_cache(struct inode *inode); 213 extern int nfs_wait_bit_killable(void *word); 214 215 /* super.c */ 216 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *); 217 extern struct file_system_type nfs_xdev_fs_type; 218 #ifdef CONFIG_NFS_V4 219 extern struct file_system_type nfs4_xdev_fs_type; 220 extern struct file_system_type nfs4_referral_fs_type; 221 #endif 222 223 extern struct rpc_stat nfs_rpcstat; 224 225 extern int __init register_nfs_fs(void); 226 extern void __exit unregister_nfs_fs(void); 227 extern void nfs_sb_active(struct super_block *sb); 228 extern void nfs_sb_deactive(struct super_block *sb); 229 230 /* namespace.c */ 231 extern char *nfs_path(const char *base, 232 const struct dentry *droot, 233 const struct dentry *dentry, 234 char *buffer, ssize_t buflen); 235 236 /* getroot.c */ 237 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 238 #ifdef CONFIG_NFS_V4 239 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 240 241 extern int nfs4_path_walk(struct nfs_server *server, 242 struct nfs_fh *mntfh, 243 const char *path); 244 #endif 245 246 /* read.c */ 247 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 248 249 /* write.c */ 250 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 251 252 /* nfs4proc.c */ 253 extern int _nfs4_call_sync(struct nfs_server *server, 254 struct rpc_message *msg, 255 struct nfs4_sequence_args *args, 256 struct nfs4_sequence_res *res, 257 int cache_reply); 258 extern int _nfs4_call_sync_session(struct nfs_server *server, 259 struct rpc_message *msg, 260 struct nfs4_sequence_args *args, 261 struct nfs4_sequence_res *res, 262 int cache_reply); 263 264 #ifdef CONFIG_NFS_V4_1 265 extern void nfs41_sequence_free_slot(const struct nfs_client *, 266 struct nfs4_sequence_res *res); 267 #endif /* CONFIG_NFS_V4_1 */ 268 269 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 270 struct nfs4_sequence_res *res) 271 { 272 #ifdef CONFIG_NFS_V4_1 273 if (nfs4_has_session(clp)) 274 nfs41_sequence_free_slot(clp, res); 275 #endif /* CONFIG_NFS_V4_1 */ 276 } 277 278 /* 279 * Determine the device name as a string 280 */ 281 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 282 const struct dentry *dentry, 283 char *buffer, ssize_t buflen) 284 { 285 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 286 dentry, buffer, buflen); 287 } 288 289 /* 290 * Determine the actual block size (and log2 thereof) 291 */ 292 static inline 293 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 294 { 295 /* make sure blocksize is a power of two */ 296 if ((bsize & (bsize - 1)) || nrbitsp) { 297 unsigned char nrbits; 298 299 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 300 ; 301 bsize = 1 << nrbits; 302 if (nrbitsp) 303 *nrbitsp = nrbits; 304 } 305 306 return bsize; 307 } 308 309 /* 310 * Calculate the number of 512byte blocks used. 311 */ 312 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 313 { 314 blkcnt_t used = (tsize + 511) >> 9; 315 return (used > ULONG_MAX) ? ULONG_MAX : used; 316 } 317 318 /* 319 * Compute and set NFS server blocksize 320 */ 321 static inline 322 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 323 { 324 if (bsize < NFS_MIN_FILE_IO_SIZE) 325 bsize = NFS_DEF_FILE_IO_SIZE; 326 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 327 bsize = NFS_MAX_FILE_IO_SIZE; 328 329 return nfs_block_bits(bsize, nrbitsp); 330 } 331 332 /* 333 * Determine the maximum file size for a superblock 334 */ 335 static inline 336 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 337 { 338 sb->s_maxbytes = (loff_t)maxfilesize; 339 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 340 sb->s_maxbytes = MAX_LFS_FILESIZE; 341 } 342 343 /* 344 * Determine the number of bytes of data the page contains 345 */ 346 static inline 347 unsigned int nfs_page_length(struct page *page) 348 { 349 loff_t i_size = i_size_read(page->mapping->host); 350 351 if (i_size > 0) { 352 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 353 if (page->index < end_index) 354 return PAGE_CACHE_SIZE; 355 if (page->index == end_index) 356 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 357 } 358 return 0; 359 } 360 361 /* 362 * Determine the number of pages in an array of length 'len' and 363 * with a base offset of 'base' 364 */ 365 static inline 366 unsigned int nfs_page_array_len(unsigned int base, size_t len) 367 { 368 return ((unsigned long)len + (unsigned long)base + 369 PAGE_SIZE - 1) >> PAGE_SHIFT; 370 } 371 372 #define IPV6_SCOPE_DELIMITER '%' 373 374 /* 375 * Set the port number in an address. Be agnostic about the address 376 * family. 377 */ 378 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) 379 { 380 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 381 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; 382 383 switch (sap->sa_family) { 384 case AF_INET: 385 ap->sin_port = htons(port); 386 break; 387 case AF_INET6: 388 ap6->sin6_port = htons(port); 389 break; 390 } 391 } 392