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 * In-kernel mount arguments 67 */ 68 struct nfs_parsed_mount_data { 69 int flags; 70 int rsize, wsize; 71 int timeo, retrans; 72 int acregmin, acregmax, 73 acdirmin, acdirmax; 74 int namlen; 75 unsigned int options; 76 unsigned int bsize; 77 unsigned int auth_flavor_len; 78 rpc_authflavor_t auth_flavors[1]; 79 char *client_address; 80 unsigned int version; 81 unsigned int minorversion; 82 char *fscache_uniq; 83 84 struct { 85 struct sockaddr_storage address; 86 size_t addrlen; 87 char *hostname; 88 u32 version; 89 int port; 90 unsigned short protocol; 91 } mount_server; 92 93 struct { 94 struct sockaddr_storage address; 95 size_t addrlen; 96 char *hostname; 97 char *export_path; 98 int port; 99 unsigned short protocol; 100 } nfs_server; 101 102 struct security_mnt_opts lsm_opts; 103 }; 104 105 /* mount_clnt.c */ 106 struct nfs_mount_request { 107 struct sockaddr *sap; 108 size_t salen; 109 char *hostname; 110 char *dirpath; 111 u32 version; 112 unsigned short protocol; 113 struct nfs_fh *fh; 114 int noresvport; 115 unsigned int *auth_flav_len; 116 rpc_authflavor_t *auth_flavs; 117 }; 118 119 extern int nfs_mount(struct nfs_mount_request *info); 120 extern void nfs_umount(const struct nfs_mount_request *info); 121 122 /* client.c */ 123 extern struct rpc_program nfs_program; 124 125 extern void nfs_put_client(struct nfs_client *); 126 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 127 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 128 extern struct nfs_server *nfs_create_server( 129 const struct nfs_parsed_mount_data *, 130 struct nfs_fh *); 131 extern struct nfs_server *nfs4_create_server( 132 const struct nfs_parsed_mount_data *, 133 struct nfs_fh *); 134 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 135 struct nfs_fh *); 136 extern void nfs_free_server(struct nfs_server *server); 137 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 138 struct nfs_fh *, 139 struct nfs_fattr *); 140 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 141 extern int nfs4_check_client_ready(struct nfs_client *clp); 142 #ifdef CONFIG_PROC_FS 143 extern int __init nfs_fs_proc_init(void); 144 extern void nfs_fs_proc_exit(void); 145 #else 146 static inline int nfs_fs_proc_init(void) 147 { 148 return 0; 149 } 150 static inline void nfs_fs_proc_exit(void) 151 { 152 } 153 #endif 154 155 /* nfs4namespace.c */ 156 #ifdef CONFIG_NFS_V4 157 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 158 #else 159 static inline 160 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 161 { 162 return ERR_PTR(-ENOENT); 163 } 164 #endif 165 166 /* callback_xdr.c */ 167 extern struct svc_version nfs4_callback_version1; 168 extern struct svc_version nfs4_callback_version4; 169 170 /* pagelist.c */ 171 extern int __init nfs_init_nfspagecache(void); 172 extern void nfs_destroy_nfspagecache(void); 173 extern int __init nfs_init_readpagecache(void); 174 extern void nfs_destroy_readpagecache(void); 175 extern int __init nfs_init_writepagecache(void); 176 extern void nfs_destroy_writepagecache(void); 177 178 extern int __init nfs_init_directcache(void); 179 extern void nfs_destroy_directcache(void); 180 181 /* nfs2xdr.c */ 182 extern int nfs_stat_to_errno(int); 183 extern struct rpc_procinfo nfs_procedures[]; 184 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 185 186 /* nfs3xdr.c */ 187 extern struct rpc_procinfo nfs3_procedures[]; 188 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 189 190 /* nfs4xdr.c */ 191 #ifdef CONFIG_NFS_V4 192 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 193 #endif 194 #ifdef CONFIG_NFS_V4_1 195 extern const u32 nfs41_maxread_overhead; 196 extern const u32 nfs41_maxwrite_overhead; 197 #endif 198 199 /* nfs4proc.c */ 200 extern void nfs4_restart_rpc(struct rpc_task *, const struct nfs_client *, 201 struct nfs4_sequence_res *); 202 #ifdef CONFIG_NFS_V4 203 extern struct rpc_procinfo nfs4_procedures[]; 204 #endif 205 206 /* proc.c */ 207 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 208 209 /* dir.c */ 210 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 211 212 /* inode.c */ 213 extern struct workqueue_struct *nfsiod_workqueue; 214 extern struct inode *nfs_alloc_inode(struct super_block *sb); 215 extern void nfs_destroy_inode(struct inode *); 216 extern int nfs_write_inode(struct inode *,int); 217 extern void nfs_clear_inode(struct inode *); 218 #ifdef CONFIG_NFS_V4 219 extern void nfs4_clear_inode(struct inode *); 220 #endif 221 void nfs_zap_acl_cache(struct inode *inode); 222 extern int nfs_wait_bit_killable(void *word); 223 224 /* super.c */ 225 extern struct file_system_type nfs_xdev_fs_type; 226 #ifdef CONFIG_NFS_V4 227 extern struct file_system_type nfs4_xdev_fs_type; 228 extern struct file_system_type nfs4_referral_fs_type; 229 #endif 230 231 extern struct rpc_stat nfs_rpcstat; 232 233 extern int __init register_nfs_fs(void); 234 extern void __exit unregister_nfs_fs(void); 235 extern void nfs_sb_active(struct super_block *sb); 236 extern void nfs_sb_deactive(struct super_block *sb); 237 238 /* namespace.c */ 239 extern char *nfs_path(const char *base, 240 const struct dentry *droot, 241 const struct dentry *dentry, 242 char *buffer, ssize_t buflen); 243 244 /* getroot.c */ 245 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 246 #ifdef CONFIG_NFS_V4 247 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 248 249 extern int nfs4_path_walk(struct nfs_server *server, 250 struct nfs_fh *mntfh, 251 const char *path); 252 #endif 253 254 /* read.c */ 255 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 256 257 /* write.c */ 258 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 259 #ifdef CONFIG_MIGRATION 260 extern int nfs_migrate_page(struct address_space *, 261 struct page *, struct page *); 262 #else 263 #define nfs_migrate_page NULL 264 #endif 265 266 /* nfs4proc.c */ 267 extern int _nfs4_call_sync(struct nfs_server *server, 268 struct rpc_message *msg, 269 struct nfs4_sequence_args *args, 270 struct nfs4_sequence_res *res, 271 int cache_reply); 272 extern int _nfs4_call_sync_session(struct nfs_server *server, 273 struct rpc_message *msg, 274 struct nfs4_sequence_args *args, 275 struct nfs4_sequence_res *res, 276 int cache_reply); 277 278 #ifdef CONFIG_NFS_V4_1 279 extern void nfs41_sequence_free_slot(const struct nfs_client *, 280 struct nfs4_sequence_res *res); 281 #endif /* CONFIG_NFS_V4_1 */ 282 283 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 284 struct nfs4_sequence_res *res) 285 { 286 #ifdef CONFIG_NFS_V4_1 287 if (nfs4_has_session(clp)) 288 nfs41_sequence_free_slot(clp, res); 289 #endif /* CONFIG_NFS_V4_1 */ 290 } 291 292 /* 293 * Determine the device name as a string 294 */ 295 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 296 const struct dentry *dentry, 297 char *buffer, ssize_t buflen) 298 { 299 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 300 dentry, buffer, buflen); 301 } 302 303 /* 304 * Determine the actual block size (and log2 thereof) 305 */ 306 static inline 307 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 308 { 309 /* make sure blocksize is a power of two */ 310 if ((bsize & (bsize - 1)) || nrbitsp) { 311 unsigned char nrbits; 312 313 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 314 ; 315 bsize = 1 << nrbits; 316 if (nrbitsp) 317 *nrbitsp = nrbits; 318 } 319 320 return bsize; 321 } 322 323 /* 324 * Calculate the number of 512byte blocks used. 325 */ 326 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 327 { 328 blkcnt_t used = (tsize + 511) >> 9; 329 return (used > ULONG_MAX) ? ULONG_MAX : used; 330 } 331 332 /* 333 * Compute and set NFS server blocksize 334 */ 335 static inline 336 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 337 { 338 if (bsize < NFS_MIN_FILE_IO_SIZE) 339 bsize = NFS_DEF_FILE_IO_SIZE; 340 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 341 bsize = NFS_MAX_FILE_IO_SIZE; 342 343 return nfs_block_bits(bsize, nrbitsp); 344 } 345 346 /* 347 * Determine the maximum file size for a superblock 348 */ 349 static inline 350 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 351 { 352 sb->s_maxbytes = (loff_t)maxfilesize; 353 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 354 sb->s_maxbytes = MAX_LFS_FILESIZE; 355 } 356 357 /* 358 * Determine the number of bytes of data the page contains 359 */ 360 static inline 361 unsigned int nfs_page_length(struct page *page) 362 { 363 loff_t i_size = i_size_read(page->mapping->host); 364 365 if (i_size > 0) { 366 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 367 if (page->index < end_index) 368 return PAGE_CACHE_SIZE; 369 if (page->index == end_index) 370 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 371 } 372 return 0; 373 } 374 375 /* 376 * Determine the number of pages in an array of length 'len' and 377 * with a base offset of 'base' 378 */ 379 static inline 380 unsigned int nfs_page_array_len(unsigned int base, size_t len) 381 { 382 return ((unsigned long)len + (unsigned long)base + 383 PAGE_SIZE - 1) >> PAGE_SHIFT; 384 } 385