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 extern int nfs4_check_client_ready(struct nfs_client *clp); 118 #ifdef CONFIG_PROC_FS 119 extern int __init nfs_fs_proc_init(void); 120 extern void nfs_fs_proc_exit(void); 121 #else 122 static inline int nfs_fs_proc_init(void) 123 { 124 return 0; 125 } 126 static inline void nfs_fs_proc_exit(void) 127 { 128 } 129 #endif 130 131 /* nfs4namespace.c */ 132 #ifdef CONFIG_NFS_V4 133 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 134 #else 135 static inline 136 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 137 { 138 return ERR_PTR(-ENOENT); 139 } 140 #endif 141 142 /* callback_xdr.c */ 143 extern struct svc_version nfs4_callback_version1; 144 145 /* pagelist.c */ 146 extern int __init nfs_init_nfspagecache(void); 147 extern void nfs_destroy_nfspagecache(void); 148 extern int __init nfs_init_readpagecache(void); 149 extern void nfs_destroy_readpagecache(void); 150 extern int __init nfs_init_writepagecache(void); 151 extern void nfs_destroy_writepagecache(void); 152 153 extern int __init nfs_init_directcache(void); 154 extern void nfs_destroy_directcache(void); 155 156 /* nfs2xdr.c */ 157 extern int nfs_stat_to_errno(int); 158 extern struct rpc_procinfo nfs_procedures[]; 159 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 160 161 /* nfs3xdr.c */ 162 extern struct rpc_procinfo nfs3_procedures[]; 163 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 164 165 /* nfs4proc.c */ 166 static inline void nfs4_restart_rpc(struct rpc_task *task, 167 const struct nfs_client *clp) 168 { 169 #ifdef CONFIG_NFS_V4_1 170 if (nfs4_has_session(clp) && 171 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { 172 rpc_restart_call_prepare(task); 173 return; 174 } 175 #endif /* CONFIG_NFS_V4_1 */ 176 rpc_restart_call(task); 177 } 178 179 /* nfs4xdr.c */ 180 #ifdef CONFIG_NFS_V4 181 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 182 #endif 183 184 /* nfs4proc.c */ 185 #ifdef CONFIG_NFS_V4 186 extern struct rpc_procinfo nfs4_procedures[]; 187 #endif 188 189 /* proc.c */ 190 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 191 192 /* dir.c */ 193 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 194 195 /* inode.c */ 196 extern struct workqueue_struct *nfsiod_workqueue; 197 extern struct inode *nfs_alloc_inode(struct super_block *sb); 198 extern void nfs_destroy_inode(struct inode *); 199 extern int nfs_write_inode(struct inode *,int); 200 extern void nfs_clear_inode(struct inode *); 201 #ifdef CONFIG_NFS_V4 202 extern void nfs4_clear_inode(struct inode *); 203 #endif 204 void nfs_zap_acl_cache(struct inode *inode); 205 extern int nfs_wait_bit_killable(void *word); 206 207 /* super.c */ 208 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *); 209 extern struct file_system_type nfs_xdev_fs_type; 210 #ifdef CONFIG_NFS_V4 211 extern struct file_system_type nfs4_xdev_fs_type; 212 extern struct file_system_type nfs4_referral_fs_type; 213 #endif 214 215 extern struct rpc_stat nfs_rpcstat; 216 217 extern int __init register_nfs_fs(void); 218 extern void __exit unregister_nfs_fs(void); 219 extern void nfs_sb_active(struct super_block *sb); 220 extern void nfs_sb_deactive(struct super_block *sb); 221 222 /* namespace.c */ 223 extern char *nfs_path(const char *base, 224 const struct dentry *droot, 225 const struct dentry *dentry, 226 char *buffer, ssize_t buflen); 227 228 /* getroot.c */ 229 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 230 #ifdef CONFIG_NFS_V4 231 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 232 233 extern int nfs4_path_walk(struct nfs_server *server, 234 struct nfs_fh *mntfh, 235 const char *path); 236 #endif 237 238 /* read.c */ 239 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 240 241 /* write.c */ 242 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 243 244 /* nfs4proc.c */ 245 extern int _nfs4_call_sync(struct nfs_server *server, 246 struct rpc_message *msg, 247 struct nfs4_sequence_args *args, 248 struct nfs4_sequence_res *res, 249 int cache_reply); 250 extern int _nfs4_call_sync_session(struct nfs_server *server, 251 struct rpc_message *msg, 252 struct nfs4_sequence_args *args, 253 struct nfs4_sequence_res *res, 254 int cache_reply); 255 256 #ifdef CONFIG_NFS_V4_1 257 extern void nfs41_sequence_free_slot(const struct nfs_client *, 258 struct nfs4_sequence_res *res); 259 #endif /* CONFIG_NFS_V4_1 */ 260 261 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 262 struct nfs4_sequence_res *res) 263 { 264 #ifdef CONFIG_NFS_V4_1 265 if (nfs4_has_session(clp)) 266 nfs41_sequence_free_slot(clp, res); 267 #endif /* CONFIG_NFS_V4_1 */ 268 } 269 270 /* 271 * Determine the device name as a string 272 */ 273 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 274 const struct dentry *dentry, 275 char *buffer, ssize_t buflen) 276 { 277 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 278 dentry, buffer, buflen); 279 } 280 281 /* 282 * Determine the actual block size (and log2 thereof) 283 */ 284 static inline 285 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 286 { 287 /* make sure blocksize is a power of two */ 288 if ((bsize & (bsize - 1)) || nrbitsp) { 289 unsigned char nrbits; 290 291 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 292 ; 293 bsize = 1 << nrbits; 294 if (nrbitsp) 295 *nrbitsp = nrbits; 296 } 297 298 return bsize; 299 } 300 301 /* 302 * Calculate the number of 512byte blocks used. 303 */ 304 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 305 { 306 blkcnt_t used = (tsize + 511) >> 9; 307 return (used > ULONG_MAX) ? ULONG_MAX : used; 308 } 309 310 /* 311 * Compute and set NFS server blocksize 312 */ 313 static inline 314 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 315 { 316 if (bsize < NFS_MIN_FILE_IO_SIZE) 317 bsize = NFS_DEF_FILE_IO_SIZE; 318 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 319 bsize = NFS_MAX_FILE_IO_SIZE; 320 321 return nfs_block_bits(bsize, nrbitsp); 322 } 323 324 /* 325 * Determine the maximum file size for a superblock 326 */ 327 static inline 328 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 329 { 330 sb->s_maxbytes = (loff_t)maxfilesize; 331 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 332 sb->s_maxbytes = MAX_LFS_FILESIZE; 333 } 334 335 /* 336 * Determine the number of bytes of data the page contains 337 */ 338 static inline 339 unsigned int nfs_page_length(struct page *page) 340 { 341 loff_t i_size = i_size_read(page->mapping->host); 342 343 if (i_size > 0) { 344 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 345 if (page->index < end_index) 346 return PAGE_CACHE_SIZE; 347 if (page->index == end_index) 348 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 349 } 350 return 0; 351 } 352 353 /* 354 * Determine the number of pages in an array of length 'len' and 355 * with a base offset of 'base' 356 */ 357 static inline 358 unsigned int nfs_page_array_len(unsigned int base, size_t len) 359 { 360 return ((unsigned long)len + (unsigned long)base + 361 PAGE_SIZE - 1) >> PAGE_SHIFT; 362 } 363 364 #define IPV6_SCOPE_DELIMITER '%' 365 366 /* 367 * Set the port number in an address. Be agnostic about the address 368 * family. 369 */ 370 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) 371 { 372 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 373 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; 374 375 switch (sap->sa_family) { 376 case AF_INET: 377 ap->sin_port = htons(port); 378 break; 379 case AF_INET6: 380 ap6->sin6_port = htons(port); 381 break; 382 } 383 } 384