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 * In-kernel mount arguments 47 */ 48 struct nfs_parsed_mount_data { 49 int flags; 50 int rsize, wsize; 51 int timeo, retrans; 52 int acregmin, acregmax, 53 acdirmin, acdirmax; 54 int namlen; 55 unsigned int options; 56 unsigned int bsize; 57 unsigned int auth_flavor_len; 58 rpc_authflavor_t auth_flavors[1]; 59 char *client_address; 60 unsigned int minorversion; 61 char *fscache_uniq; 62 63 struct { 64 struct sockaddr_storage address; 65 size_t addrlen; 66 char *hostname; 67 u32 version; 68 unsigned short port; 69 unsigned short protocol; 70 } mount_server; 71 72 struct { 73 struct sockaddr_storage address; 74 size_t addrlen; 75 char *hostname; 76 char *export_path; 77 unsigned short port; 78 unsigned short protocol; 79 } nfs_server; 80 81 struct security_mnt_opts lsm_opts; 82 }; 83 84 /* mount_clnt.c */ 85 struct nfs_mount_request { 86 struct sockaddr *sap; 87 size_t salen; 88 char *hostname; 89 char *dirpath; 90 u32 version; 91 unsigned short protocol; 92 struct nfs_fh *fh; 93 int noresvport; 94 }; 95 96 extern int nfs_mount(struct nfs_mount_request *info); 97 98 /* client.c */ 99 extern struct rpc_program nfs_program; 100 101 extern void nfs_put_client(struct nfs_client *); 102 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 103 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 104 extern struct nfs_server *nfs_create_server( 105 const struct nfs_parsed_mount_data *, 106 struct nfs_fh *); 107 extern struct nfs_server *nfs4_create_server( 108 const struct nfs_parsed_mount_data *, 109 struct nfs_fh *); 110 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 111 struct nfs_fh *); 112 extern void nfs_free_server(struct nfs_server *server); 113 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 114 struct nfs_fh *, 115 struct nfs_fattr *); 116 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 117 #ifdef CONFIG_PROC_FS 118 extern int __init nfs_fs_proc_init(void); 119 extern void nfs_fs_proc_exit(void); 120 #else 121 static inline int nfs_fs_proc_init(void) 122 { 123 return 0; 124 } 125 static inline void nfs_fs_proc_exit(void) 126 { 127 } 128 #endif 129 130 /* nfs4namespace.c */ 131 #ifdef CONFIG_NFS_V4 132 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 133 #else 134 static inline 135 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 136 { 137 return ERR_PTR(-ENOENT); 138 } 139 #endif 140 141 /* callback_xdr.c */ 142 extern struct svc_version nfs4_callback_version1; 143 144 /* pagelist.c */ 145 extern int __init nfs_init_nfspagecache(void); 146 extern void nfs_destroy_nfspagecache(void); 147 extern int __init nfs_init_readpagecache(void); 148 extern void nfs_destroy_readpagecache(void); 149 extern int __init nfs_init_writepagecache(void); 150 extern void nfs_destroy_writepagecache(void); 151 152 extern int __init nfs_init_directcache(void); 153 extern void nfs_destroy_directcache(void); 154 155 /* nfs2xdr.c */ 156 extern int nfs_stat_to_errno(int); 157 extern struct rpc_procinfo nfs_procedures[]; 158 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 159 160 /* nfs3xdr.c */ 161 extern struct rpc_procinfo nfs3_procedures[]; 162 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 163 164 /* nfs4proc.c */ 165 static inline void nfs4_restart_rpc(struct rpc_task *task, 166 const struct nfs_client *clp) 167 { 168 #ifdef CONFIG_NFS_V4_1 169 if (nfs4_has_session(clp) && 170 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { 171 rpc_restart_call_prepare(task); 172 return; 173 } 174 #endif /* CONFIG_NFS_V4_1 */ 175 rpc_restart_call(task); 176 } 177 178 /* nfs4xdr.c */ 179 #ifdef CONFIG_NFS_V4 180 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 181 #endif 182 183 /* nfs4proc.c */ 184 #ifdef CONFIG_NFS_V4 185 extern struct rpc_procinfo nfs4_procedures[]; 186 #endif 187 188 /* proc.c */ 189 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 190 191 /* dir.c */ 192 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 193 194 /* inode.c */ 195 extern struct workqueue_struct *nfsiod_workqueue; 196 extern struct inode *nfs_alloc_inode(struct super_block *sb); 197 extern void nfs_destroy_inode(struct inode *); 198 extern int nfs_write_inode(struct inode *,int); 199 extern void nfs_clear_inode(struct inode *); 200 #ifdef CONFIG_NFS_V4 201 extern void nfs4_clear_inode(struct inode *); 202 #endif 203 void nfs_zap_acl_cache(struct inode *inode); 204 extern int nfs_wait_bit_killable(void *word); 205 206 /* super.c */ 207 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *); 208 extern struct file_system_type nfs_xdev_fs_type; 209 #ifdef CONFIG_NFS_V4 210 extern struct file_system_type nfs4_xdev_fs_type; 211 extern struct file_system_type nfs4_referral_fs_type; 212 #endif 213 214 extern struct rpc_stat nfs_rpcstat; 215 216 extern int __init register_nfs_fs(void); 217 extern void __exit unregister_nfs_fs(void); 218 extern void nfs_sb_active(struct super_block *sb); 219 extern void nfs_sb_deactive(struct super_block *sb); 220 221 /* namespace.c */ 222 extern char *nfs_path(const char *base, 223 const struct dentry *droot, 224 const struct dentry *dentry, 225 char *buffer, ssize_t buflen); 226 227 /* getroot.c */ 228 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 229 #ifdef CONFIG_NFS_V4 230 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 231 232 extern int nfs4_path_walk(struct nfs_server *server, 233 struct nfs_fh *mntfh, 234 const char *path); 235 #endif 236 237 /* read.c */ 238 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 239 240 /* write.c */ 241 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 242 243 /* nfs4proc.c */ 244 extern int _nfs4_call_sync(struct nfs_server *server, 245 struct rpc_message *msg, 246 struct nfs4_sequence_args *args, 247 struct nfs4_sequence_res *res, 248 int cache_reply); 249 extern int _nfs4_call_sync_session(struct nfs_server *server, 250 struct rpc_message *msg, 251 struct nfs4_sequence_args *args, 252 struct nfs4_sequence_res *res, 253 int cache_reply); 254 255 #ifdef CONFIG_NFS_V4_1 256 extern void nfs41_sequence_free_slot(const struct nfs_client *, 257 struct nfs4_sequence_res *res); 258 #endif /* CONFIG_NFS_V4_1 */ 259 260 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 261 struct nfs4_sequence_res *res) 262 { 263 #ifdef CONFIG_NFS_V4_1 264 if (nfs4_has_session(clp)) 265 nfs41_sequence_free_slot(clp, res); 266 #endif /* CONFIG_NFS_V4_1 */ 267 } 268 269 /* 270 * Determine the device name as a string 271 */ 272 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 273 const struct dentry *dentry, 274 char *buffer, ssize_t buflen) 275 { 276 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 277 dentry, buffer, buflen); 278 } 279 280 /* 281 * Determine the actual block size (and log2 thereof) 282 */ 283 static inline 284 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 285 { 286 /* make sure blocksize is a power of two */ 287 if ((bsize & (bsize - 1)) || nrbitsp) { 288 unsigned char nrbits; 289 290 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 291 ; 292 bsize = 1 << nrbits; 293 if (nrbitsp) 294 *nrbitsp = nrbits; 295 } 296 297 return bsize; 298 } 299 300 /* 301 * Calculate the number of 512byte blocks used. 302 */ 303 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 304 { 305 blkcnt_t used = (tsize + 511) >> 9; 306 return (used > ULONG_MAX) ? ULONG_MAX : used; 307 } 308 309 /* 310 * Compute and set NFS server blocksize 311 */ 312 static inline 313 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 314 { 315 if (bsize < NFS_MIN_FILE_IO_SIZE) 316 bsize = NFS_DEF_FILE_IO_SIZE; 317 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 318 bsize = NFS_MAX_FILE_IO_SIZE; 319 320 return nfs_block_bits(bsize, nrbitsp); 321 } 322 323 /* 324 * Determine the maximum file size for a superblock 325 */ 326 static inline 327 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 328 { 329 sb->s_maxbytes = (loff_t)maxfilesize; 330 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 331 sb->s_maxbytes = MAX_LFS_FILESIZE; 332 } 333 334 /* 335 * Determine the number of bytes of data the page contains 336 */ 337 static inline 338 unsigned int nfs_page_length(struct page *page) 339 { 340 loff_t i_size = i_size_read(page->mapping->host); 341 342 if (i_size > 0) { 343 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 344 if (page->index < end_index) 345 return PAGE_CACHE_SIZE; 346 if (page->index == end_index) 347 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 348 } 349 return 0; 350 } 351 352 /* 353 * Determine the number of pages in an array of length 'len' and 354 * with a base offset of 'base' 355 */ 356 static inline 357 unsigned int nfs_page_array_len(unsigned int base, size_t len) 358 { 359 return ((unsigned long)len + (unsigned long)base + 360 PAGE_SIZE - 1) >> PAGE_SHIFT; 361 } 362 363 #define IPV6_SCOPE_DELIMITER '%' 364 365 /* 366 * Set the port number in an address. Be agnostic about the address 367 * family. 368 */ 369 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) 370 { 371 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 372 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; 373 374 switch (sap->sa_family) { 375 case AF_INET: 376 ap->sin_port = htons(port); 377 break; 378 case AF_INET6: 379 ap6->sin6_port = htons(port); 380 break; 381 } 382 } 383