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 * Value used if the user did not specify a port value. 53 */ 54 #define NFS_UNSPEC_PORT (-1) 55 56 /* 57 * In-kernel mount arguments 58 */ 59 struct nfs_parsed_mount_data { 60 int flags; 61 int rsize, wsize; 62 int timeo, retrans; 63 int acregmin, acregmax, 64 acdirmin, acdirmax; 65 int namlen; 66 unsigned int options; 67 unsigned int bsize; 68 unsigned int auth_flavor_len; 69 rpc_authflavor_t auth_flavors[1]; 70 char *client_address; 71 unsigned int version; 72 unsigned int minorversion; 73 char *fscache_uniq; 74 75 struct { 76 struct sockaddr_storage address; 77 size_t addrlen; 78 char *hostname; 79 u32 version; 80 int port; 81 unsigned short protocol; 82 } mount_server; 83 84 struct { 85 struct sockaddr_storage address; 86 size_t addrlen; 87 char *hostname; 88 char *export_path; 89 int port; 90 unsigned short protocol; 91 } nfs_server; 92 93 struct security_mnt_opts lsm_opts; 94 }; 95 96 /* mount_clnt.c */ 97 struct nfs_mount_request { 98 struct sockaddr *sap; 99 size_t salen; 100 char *hostname; 101 char *dirpath; 102 u32 version; 103 unsigned short protocol; 104 struct nfs_fh *fh; 105 int noresvport; 106 unsigned int *auth_flav_len; 107 rpc_authflavor_t *auth_flavs; 108 }; 109 110 extern int nfs_mount(struct nfs_mount_request *info); 111 extern void nfs_umount(const struct nfs_mount_request *info); 112 113 /* client.c */ 114 extern struct rpc_program nfs_program; 115 116 extern void nfs_put_client(struct nfs_client *); 117 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 118 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 119 extern struct nfs_server *nfs_create_server( 120 const struct nfs_parsed_mount_data *, 121 struct nfs_fh *); 122 extern struct nfs_server *nfs4_create_server( 123 const struct nfs_parsed_mount_data *, 124 struct nfs_fh *); 125 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 126 struct nfs_fh *); 127 extern void nfs_free_server(struct nfs_server *server); 128 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 129 struct nfs_fh *, 130 struct nfs_fattr *); 131 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 132 extern int nfs4_check_client_ready(struct nfs_client *clp); 133 #ifdef CONFIG_PROC_FS 134 extern int __init nfs_fs_proc_init(void); 135 extern void nfs_fs_proc_exit(void); 136 #else 137 static inline int nfs_fs_proc_init(void) 138 { 139 return 0; 140 } 141 static inline void nfs_fs_proc_exit(void) 142 { 143 } 144 #endif 145 146 /* nfs4namespace.c */ 147 #ifdef CONFIG_NFS_V4 148 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 149 #else 150 static inline 151 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 152 { 153 return ERR_PTR(-ENOENT); 154 } 155 #endif 156 157 /* callback_xdr.c */ 158 extern struct svc_version nfs4_callback_version1; 159 160 /* pagelist.c */ 161 extern int __init nfs_init_nfspagecache(void); 162 extern void nfs_destroy_nfspagecache(void); 163 extern int __init nfs_init_readpagecache(void); 164 extern void nfs_destroy_readpagecache(void); 165 extern int __init nfs_init_writepagecache(void); 166 extern void nfs_destroy_writepagecache(void); 167 168 extern int __init nfs_init_directcache(void); 169 extern void nfs_destroy_directcache(void); 170 171 /* nfs2xdr.c */ 172 extern int nfs_stat_to_errno(int); 173 extern struct rpc_procinfo nfs_procedures[]; 174 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 175 176 /* nfs3xdr.c */ 177 extern struct rpc_procinfo nfs3_procedures[]; 178 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 179 180 /* nfs4proc.c */ 181 static inline void nfs4_restart_rpc(struct rpc_task *task, 182 const struct nfs_client *clp) 183 { 184 #ifdef CONFIG_NFS_V4_1 185 if (nfs4_has_session(clp) && 186 test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { 187 rpc_restart_call_prepare(task); 188 return; 189 } 190 #endif /* CONFIG_NFS_V4_1 */ 191 rpc_restart_call(task); 192 } 193 194 /* nfs4xdr.c */ 195 #ifdef CONFIG_NFS_V4 196 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 197 #endif 198 199 /* nfs4proc.c */ 200 #ifdef CONFIG_NFS_V4 201 extern struct rpc_procinfo nfs4_procedures[]; 202 #endif 203 204 /* proc.c */ 205 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 206 207 /* dir.c */ 208 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 209 210 /* inode.c */ 211 extern struct workqueue_struct *nfsiod_workqueue; 212 extern struct inode *nfs_alloc_inode(struct super_block *sb); 213 extern void nfs_destroy_inode(struct inode *); 214 extern int nfs_write_inode(struct inode *,int); 215 extern void nfs_clear_inode(struct inode *); 216 #ifdef CONFIG_NFS_V4 217 extern void nfs4_clear_inode(struct inode *); 218 #endif 219 void nfs_zap_acl_cache(struct inode *inode); 220 extern int nfs_wait_bit_killable(void *word); 221 222 /* super.c */ 223 extern struct file_system_type nfs_xdev_fs_type; 224 #ifdef CONFIG_NFS_V4 225 extern struct file_system_type nfs4_xdev_fs_type; 226 extern struct file_system_type nfs4_referral_fs_type; 227 #endif 228 229 extern struct rpc_stat nfs_rpcstat; 230 231 extern int __init register_nfs_fs(void); 232 extern void __exit unregister_nfs_fs(void); 233 extern void nfs_sb_active(struct super_block *sb); 234 extern void nfs_sb_deactive(struct super_block *sb); 235 236 /* namespace.c */ 237 extern char *nfs_path(const char *base, 238 const struct dentry *droot, 239 const struct dentry *dentry, 240 char *buffer, ssize_t buflen); 241 242 /* getroot.c */ 243 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 244 #ifdef CONFIG_NFS_V4 245 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 246 247 extern int nfs4_path_walk(struct nfs_server *server, 248 struct nfs_fh *mntfh, 249 const char *path); 250 #endif 251 252 /* read.c */ 253 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 254 255 /* write.c */ 256 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 257 #ifdef CONFIG_MIGRATION 258 extern int nfs_migrate_page(struct address_space *, 259 struct page *, struct page *); 260 #else 261 #define nfs_migrate_page NULL 262 #endif 263 264 /* nfs4proc.c */ 265 extern int _nfs4_call_sync(struct nfs_server *server, 266 struct rpc_message *msg, 267 struct nfs4_sequence_args *args, 268 struct nfs4_sequence_res *res, 269 int cache_reply); 270 extern int _nfs4_call_sync_session(struct nfs_server *server, 271 struct rpc_message *msg, 272 struct nfs4_sequence_args *args, 273 struct nfs4_sequence_res *res, 274 int cache_reply); 275 276 #ifdef CONFIG_NFS_V4_1 277 extern void nfs41_sequence_free_slot(const struct nfs_client *, 278 struct nfs4_sequence_res *res); 279 #endif /* CONFIG_NFS_V4_1 */ 280 281 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 282 struct nfs4_sequence_res *res) 283 { 284 #ifdef CONFIG_NFS_V4_1 285 if (nfs4_has_session(clp)) 286 nfs41_sequence_free_slot(clp, res); 287 #endif /* CONFIG_NFS_V4_1 */ 288 } 289 290 /* 291 * Determine the device name as a string 292 */ 293 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 294 const struct dentry *dentry, 295 char *buffer, ssize_t buflen) 296 { 297 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 298 dentry, buffer, buflen); 299 } 300 301 /* 302 * Determine the actual block size (and log2 thereof) 303 */ 304 static inline 305 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 306 { 307 /* make sure blocksize is a power of two */ 308 if ((bsize & (bsize - 1)) || nrbitsp) { 309 unsigned char nrbits; 310 311 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 312 ; 313 bsize = 1 << nrbits; 314 if (nrbitsp) 315 *nrbitsp = nrbits; 316 } 317 318 return bsize; 319 } 320 321 /* 322 * Calculate the number of 512byte blocks used. 323 */ 324 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 325 { 326 blkcnt_t used = (tsize + 511) >> 9; 327 return (used > ULONG_MAX) ? ULONG_MAX : used; 328 } 329 330 /* 331 * Compute and set NFS server blocksize 332 */ 333 static inline 334 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 335 { 336 if (bsize < NFS_MIN_FILE_IO_SIZE) 337 bsize = NFS_DEF_FILE_IO_SIZE; 338 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 339 bsize = NFS_MAX_FILE_IO_SIZE; 340 341 return nfs_block_bits(bsize, nrbitsp); 342 } 343 344 /* 345 * Determine the maximum file size for a superblock 346 */ 347 static inline 348 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 349 { 350 sb->s_maxbytes = (loff_t)maxfilesize; 351 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 352 sb->s_maxbytes = MAX_LFS_FILESIZE; 353 } 354 355 /* 356 * Determine the number of bytes of data the page contains 357 */ 358 static inline 359 unsigned int nfs_page_length(struct page *page) 360 { 361 loff_t i_size = i_size_read(page->mapping->host); 362 363 if (i_size > 0) { 364 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 365 if (page->index < end_index) 366 return PAGE_CACHE_SIZE; 367 if (page->index == end_index) 368 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 369 } 370 return 0; 371 } 372 373 /* 374 * Determine the number of pages in an array of length 'len' and 375 * with a base offset of 'base' 376 */ 377 static inline 378 unsigned int nfs_page_array_len(unsigned int base, size_t len) 379 { 380 return ((unsigned long)len + (unsigned long)base + 381 PAGE_SIZE - 1) >> PAGE_SHIFT; 382 } 383