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 * Maximum number of pages that readdir can use for creating 67 * a vmapped array of pages. 68 */ 69 #define NFS_MAX_READDIR_PAGES 8 70 71 /* 72 * In-kernel mount arguments 73 */ 74 struct nfs_parsed_mount_data { 75 int flags; 76 int rsize, wsize; 77 int timeo, retrans; 78 int acregmin, acregmax, 79 acdirmin, acdirmax; 80 int namlen; 81 unsigned int options; 82 unsigned int bsize; 83 unsigned int auth_flavor_len; 84 rpc_authflavor_t auth_flavors[1]; 85 char *client_address; 86 unsigned int version; 87 unsigned int minorversion; 88 char *fscache_uniq; 89 90 struct { 91 struct sockaddr_storage address; 92 size_t addrlen; 93 char *hostname; 94 u32 version; 95 int port; 96 unsigned short protocol; 97 } mount_server; 98 99 struct { 100 struct sockaddr_storage address; 101 size_t addrlen; 102 char *hostname; 103 char *export_path; 104 int port; 105 unsigned short protocol; 106 } nfs_server; 107 108 struct security_mnt_opts lsm_opts; 109 }; 110 111 /* mount_clnt.c */ 112 struct nfs_mount_request { 113 struct sockaddr *sap; 114 size_t salen; 115 char *hostname; 116 char *dirpath; 117 u32 version; 118 unsigned short protocol; 119 struct nfs_fh *fh; 120 int noresvport; 121 unsigned int *auth_flav_len; 122 rpc_authflavor_t *auth_flavs; 123 }; 124 125 extern int nfs_mount(struct nfs_mount_request *info); 126 extern void nfs_umount(const struct nfs_mount_request *info); 127 128 /* client.c */ 129 extern struct rpc_program nfs_program; 130 131 extern void nfs_put_client(struct nfs_client *); 132 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 133 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 134 extern struct nfs_server *nfs_create_server( 135 const struct nfs_parsed_mount_data *, 136 struct nfs_fh *); 137 extern struct nfs_server *nfs4_create_server( 138 const struct nfs_parsed_mount_data *, 139 struct nfs_fh *); 140 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 141 struct nfs_fh *); 142 extern void nfs_free_server(struct nfs_server *server); 143 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 144 struct nfs_fh *, 145 struct nfs_fattr *); 146 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 147 extern int nfs4_check_client_ready(struct nfs_client *clp); 148 #ifdef CONFIG_PROC_FS 149 extern int __init nfs_fs_proc_init(void); 150 extern void nfs_fs_proc_exit(void); 151 #else 152 static inline int nfs_fs_proc_init(void) 153 { 154 return 0; 155 } 156 static inline void nfs_fs_proc_exit(void) 157 { 158 } 159 #endif 160 161 /* nfs4namespace.c */ 162 #ifdef CONFIG_NFS_V4 163 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 164 #else 165 static inline 166 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 167 { 168 return ERR_PTR(-ENOENT); 169 } 170 #endif 171 172 /* callback_xdr.c */ 173 extern struct svc_version nfs4_callback_version1; 174 extern struct svc_version nfs4_callback_version4; 175 176 /* pagelist.c */ 177 extern int __init nfs_init_nfspagecache(void); 178 extern void nfs_destroy_nfspagecache(void); 179 extern int __init nfs_init_readpagecache(void); 180 extern void nfs_destroy_readpagecache(void); 181 extern int __init nfs_init_writepagecache(void); 182 extern void nfs_destroy_writepagecache(void); 183 184 extern int __init nfs_init_directcache(void); 185 extern void nfs_destroy_directcache(void); 186 187 /* nfs2xdr.c */ 188 extern int nfs_stat_to_errno(int); 189 extern struct rpc_procinfo nfs_procedures[]; 190 extern __be32 *nfs_decode_dirent(struct xdr_stream *, struct nfs_entry *, int); 191 192 /* nfs3xdr.c */ 193 extern struct rpc_procinfo nfs3_procedures[]; 194 extern __be32 *nfs3_decode_dirent(struct xdr_stream *, struct nfs_entry *, int); 195 196 /* nfs4xdr.c */ 197 #ifdef CONFIG_NFS_V4 198 extern __be32 *nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *entry, int plus); 199 #endif 200 #ifdef CONFIG_NFS_V4_1 201 extern const u32 nfs41_maxread_overhead; 202 extern const u32 nfs41_maxwrite_overhead; 203 #endif 204 205 /* nfs4proc.c */ 206 #ifdef CONFIG_NFS_V4 207 extern struct rpc_procinfo nfs4_procedures[]; 208 #endif 209 210 /* proc.c */ 211 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 212 213 /* dir.c */ 214 extern int nfs_access_cache_shrinker(struct shrinker *shrink, 215 int nr_to_scan, gfp_t gfp_mask); 216 217 /* inode.c */ 218 extern struct workqueue_struct *nfsiod_workqueue; 219 extern struct inode *nfs_alloc_inode(struct super_block *sb); 220 extern void nfs_destroy_inode(struct inode *); 221 extern int nfs_write_inode(struct inode *, struct writeback_control *); 222 extern void nfs_evict_inode(struct inode *); 223 #ifdef CONFIG_NFS_V4 224 extern void nfs4_evict_inode(struct inode *); 225 #endif 226 void nfs_zap_acl_cache(struct inode *inode); 227 extern int nfs_wait_bit_killable(void *word); 228 229 /* super.c */ 230 extern struct file_system_type nfs_xdev_fs_type; 231 #ifdef CONFIG_NFS_V4 232 extern struct file_system_type nfs4_xdev_fs_type; 233 extern struct file_system_type nfs4_referral_fs_type; 234 #endif 235 236 extern struct rpc_stat nfs_rpcstat; 237 238 extern int __init register_nfs_fs(void); 239 extern void __exit unregister_nfs_fs(void); 240 extern void nfs_sb_active(struct super_block *sb); 241 extern void nfs_sb_deactive(struct super_block *sb); 242 243 /* namespace.c */ 244 extern char *nfs_path(const char *base, 245 const struct dentry *droot, 246 const struct dentry *dentry, 247 char *buffer, ssize_t buflen); 248 249 /* getroot.c */ 250 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 251 #ifdef CONFIG_NFS_V4 252 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 253 254 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 255 #endif 256 257 /* read.c */ 258 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 259 260 /* write.c */ 261 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 262 #ifdef CONFIG_MIGRATION 263 extern int nfs_migrate_page(struct address_space *, 264 struct page *, struct page *); 265 #else 266 #define nfs_migrate_page NULL 267 #endif 268 269 /* nfs4proc.c */ 270 extern int _nfs4_call_sync(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 extern int _nfs4_call_sync_session(struct nfs_server *server, 276 struct rpc_message *msg, 277 struct nfs4_sequence_args *args, 278 struct nfs4_sequence_res *res, 279 int cache_reply); 280 281 /* 282 * Determine the device name as a string 283 */ 284 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 285 const struct dentry *dentry, 286 char *buffer, ssize_t buflen) 287 { 288 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 289 dentry, buffer, buflen); 290 } 291 292 /* 293 * Determine the actual block size (and log2 thereof) 294 */ 295 static inline 296 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 297 { 298 /* make sure blocksize is a power of two */ 299 if ((bsize & (bsize - 1)) || nrbitsp) { 300 unsigned char nrbits; 301 302 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 303 ; 304 bsize = 1 << nrbits; 305 if (nrbitsp) 306 *nrbitsp = nrbits; 307 } 308 309 return bsize; 310 } 311 312 /* 313 * Calculate the number of 512byte blocks used. 314 */ 315 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 316 { 317 blkcnt_t used = (tsize + 511) >> 9; 318 return (used > ULONG_MAX) ? ULONG_MAX : used; 319 } 320 321 /* 322 * Compute and set NFS server blocksize 323 */ 324 static inline 325 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 326 { 327 if (bsize < NFS_MIN_FILE_IO_SIZE) 328 bsize = NFS_DEF_FILE_IO_SIZE; 329 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 330 bsize = NFS_MAX_FILE_IO_SIZE; 331 332 return nfs_block_bits(bsize, nrbitsp); 333 } 334 335 /* 336 * Determine the maximum file size for a superblock 337 */ 338 static inline 339 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 340 { 341 sb->s_maxbytes = (loff_t)maxfilesize; 342 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 343 sb->s_maxbytes = MAX_LFS_FILESIZE; 344 } 345 346 /* 347 * Determine the number of bytes of data the page contains 348 */ 349 static inline 350 unsigned int nfs_page_length(struct page *page) 351 { 352 loff_t i_size = i_size_read(page->mapping->host); 353 354 if (i_size > 0) { 355 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 356 if (page->index < end_index) 357 return PAGE_CACHE_SIZE; 358 if (page->index == end_index) 359 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 360 } 361 return 0; 362 } 363 364 /* 365 * Determine the number of pages in an array of length 'len' and 366 * with a base offset of 'base' 367 */ 368 static inline 369 unsigned int nfs_page_array_len(unsigned int base, size_t len) 370 { 371 return ((unsigned long)len + (unsigned long)base + 372 PAGE_SIZE - 1) >> PAGE_SHIFT; 373 } 374 375 /* 376 * Helper for restarting RPC calls in the possible presence of NFSv4.1 377 * sessions. 378 */ 379 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp) 380 { 381 if (nfs4_has_session(clp)) 382 return rpc_restart_call_prepare(task); 383 return rpc_restart_call(task); 384 } 385