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 minorversion; 72 char *fscache_uniq; 73 74 struct { 75 struct sockaddr_storage address; 76 size_t addrlen; 77 char *hostname; 78 u32 version; 79 int port; 80 unsigned short protocol; 81 } mount_server; 82 83 struct { 84 struct sockaddr_storage address; 85 size_t addrlen; 86 char *hostname; 87 char *export_path; 88 int port; 89 unsigned short protocol; 90 } nfs_server; 91 92 struct security_mnt_opts lsm_opts; 93 }; 94 95 /* mount_clnt.c */ 96 struct nfs_mount_request { 97 struct sockaddr *sap; 98 size_t salen; 99 char *hostname; 100 char *dirpath; 101 u32 version; 102 unsigned short protocol; 103 struct nfs_fh *fh; 104 int noresvport; 105 unsigned int *auth_flav_len; 106 rpc_authflavor_t *auth_flavs; 107 }; 108 109 extern int nfs_mount(struct nfs_mount_request *info); 110 extern void nfs_umount(const struct nfs_mount_request *info); 111 112 /* client.c */ 113 extern struct rpc_program nfs_program; 114 115 extern void nfs_put_client(struct nfs_client *); 116 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 117 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 118 extern struct nfs_server *nfs_create_server( 119 const struct nfs_parsed_mount_data *, 120 struct nfs_fh *); 121 extern struct nfs_server *nfs4_create_server( 122 const struct nfs_parsed_mount_data *, 123 struct nfs_fh *); 124 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 125 struct nfs_fh *); 126 extern void nfs_free_server(struct nfs_server *server); 127 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 128 struct nfs_fh *, 129 struct nfs_fattr *); 130 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 131 extern int nfs4_check_client_ready(struct nfs_client *clp); 132 #ifdef CONFIG_PROC_FS 133 extern int __init nfs_fs_proc_init(void); 134 extern void nfs_fs_proc_exit(void); 135 #else 136 static inline int nfs_fs_proc_init(void) 137 { 138 return 0; 139 } 140 static inline void nfs_fs_proc_exit(void) 141 { 142 } 143 #endif 144 145 /* nfs4namespace.c */ 146 #ifdef CONFIG_NFS_V4 147 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 148 #else 149 static inline 150 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 151 { 152 return ERR_PTR(-ENOENT); 153 } 154 #endif 155 156 /* callback_xdr.c */ 157 extern struct svc_version nfs4_callback_version1; 158 159 /* pagelist.c */ 160 extern int __init nfs_init_nfspagecache(void); 161 extern void nfs_destroy_nfspagecache(void); 162 extern int __init nfs_init_readpagecache(void); 163 extern void nfs_destroy_readpagecache(void); 164 extern int __init nfs_init_writepagecache(void); 165 extern void nfs_destroy_writepagecache(void); 166 167 extern int __init nfs_init_directcache(void); 168 extern void nfs_destroy_directcache(void); 169 170 /* nfs2xdr.c */ 171 extern int nfs_stat_to_errno(int); 172 extern struct rpc_procinfo nfs_procedures[]; 173 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 174 175 /* nfs3xdr.c */ 176 extern struct rpc_procinfo nfs3_procedures[]; 177 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 178 179 /* nfs4proc.c */ 180 static inline void nfs4_restart_rpc(struct rpc_task *task, 181 const struct nfs_client *clp) 182 { 183 #ifdef CONFIG_NFS_V4_1 184 if (nfs4_has_session(clp) && 185 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { 186 rpc_restart_call_prepare(task); 187 return; 188 } 189 #endif /* CONFIG_NFS_V4_1 */ 190 rpc_restart_call(task); 191 } 192 193 /* nfs4xdr.c */ 194 #ifdef CONFIG_NFS_V4 195 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 196 #endif 197 198 /* nfs4proc.c */ 199 #ifdef CONFIG_NFS_V4 200 extern struct rpc_procinfo nfs4_procedures[]; 201 #endif 202 203 /* proc.c */ 204 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 205 206 /* dir.c */ 207 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 208 209 /* inode.c */ 210 extern struct workqueue_struct *nfsiod_workqueue; 211 extern struct inode *nfs_alloc_inode(struct super_block *sb); 212 extern void nfs_destroy_inode(struct inode *); 213 extern int nfs_write_inode(struct inode *,int); 214 extern void nfs_clear_inode(struct inode *); 215 #ifdef CONFIG_NFS_V4 216 extern void nfs4_clear_inode(struct inode *); 217 #endif 218 void nfs_zap_acl_cache(struct inode *inode); 219 extern int nfs_wait_bit_killable(void *word); 220 221 /* super.c */ 222 extern struct file_system_type nfs_xdev_fs_type; 223 #ifdef CONFIG_NFS_V4 224 extern struct file_system_type nfs4_xdev_fs_type; 225 extern struct file_system_type nfs4_referral_fs_type; 226 #endif 227 228 extern struct rpc_stat nfs_rpcstat; 229 230 extern int __init register_nfs_fs(void); 231 extern void __exit unregister_nfs_fs(void); 232 extern void nfs_sb_active(struct super_block *sb); 233 extern void nfs_sb_deactive(struct super_block *sb); 234 235 /* namespace.c */ 236 extern char *nfs_path(const char *base, 237 const struct dentry *droot, 238 const struct dentry *dentry, 239 char *buffer, ssize_t buflen); 240 241 /* getroot.c */ 242 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 243 #ifdef CONFIG_NFS_V4 244 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 245 246 extern int nfs4_path_walk(struct nfs_server *server, 247 struct nfs_fh *mntfh, 248 const char *path); 249 #endif 250 251 /* read.c */ 252 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 253 254 /* write.c */ 255 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 256 #ifdef CONFIG_MIGRATION 257 extern int nfs_migrate_page(struct address_space *, 258 struct page *, struct page *); 259 #else 260 #define nfs_migrate_page NULL 261 #endif 262 263 /* nfs4proc.c */ 264 extern int _nfs4_call_sync(struct nfs_server *server, 265 struct rpc_message *msg, 266 struct nfs4_sequence_args *args, 267 struct nfs4_sequence_res *res, 268 int cache_reply); 269 extern int _nfs4_call_sync_session(struct nfs_server *server, 270 struct rpc_message *msg, 271 struct nfs4_sequence_args *args, 272 struct nfs4_sequence_res *res, 273 int cache_reply); 274 275 #ifdef CONFIG_NFS_V4_1 276 extern void nfs41_sequence_free_slot(const struct nfs_client *, 277 struct nfs4_sequence_res *res); 278 #endif /* CONFIG_NFS_V4_1 */ 279 280 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 281 struct nfs4_sequence_res *res) 282 { 283 #ifdef CONFIG_NFS_V4_1 284 if (nfs4_has_session(clp)) 285 nfs41_sequence_free_slot(clp, res); 286 #endif /* CONFIG_NFS_V4_1 */ 287 } 288 289 /* 290 * Determine the device name as a string 291 */ 292 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 293 const struct dentry *dentry, 294 char *buffer, ssize_t buflen) 295 { 296 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 297 dentry, buffer, buflen); 298 } 299 300 /* 301 * Determine the actual block size (and log2 thereof) 302 */ 303 static inline 304 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 305 { 306 /* make sure blocksize is a power of two */ 307 if ((bsize & (bsize - 1)) || nrbitsp) { 308 unsigned char nrbits; 309 310 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 311 ; 312 bsize = 1 << nrbits; 313 if (nrbitsp) 314 *nrbitsp = nrbits; 315 } 316 317 return bsize; 318 } 319 320 /* 321 * Calculate the number of 512byte blocks used. 322 */ 323 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 324 { 325 blkcnt_t used = (tsize + 511) >> 9; 326 return (used > ULONG_MAX) ? ULONG_MAX : used; 327 } 328 329 /* 330 * Compute and set NFS server blocksize 331 */ 332 static inline 333 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 334 { 335 if (bsize < NFS_MIN_FILE_IO_SIZE) 336 bsize = NFS_DEF_FILE_IO_SIZE; 337 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 338 bsize = NFS_MAX_FILE_IO_SIZE; 339 340 return nfs_block_bits(bsize, nrbitsp); 341 } 342 343 /* 344 * Determine the maximum file size for a superblock 345 */ 346 static inline 347 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 348 { 349 sb->s_maxbytes = (loff_t)maxfilesize; 350 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 351 sb->s_maxbytes = MAX_LFS_FILESIZE; 352 } 353 354 /* 355 * Determine the number of bytes of data the page contains 356 */ 357 static inline 358 unsigned int nfs_page_length(struct page *page) 359 { 360 loff_t i_size = i_size_read(page->mapping->host); 361 362 if (i_size > 0) { 363 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 364 if (page->index < end_index) 365 return PAGE_CACHE_SIZE; 366 if (page->index == end_index) 367 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 368 } 369 return 0; 370 } 371 372 /* 373 * Determine the number of pages in an array of length 'len' and 374 * with a base offset of 'base' 375 */ 376 static inline 377 unsigned int nfs_page_array_len(unsigned int base, size_t len) 378 { 379 return ((unsigned long)len + (unsigned long)base + 380 PAGE_SIZE - 1) >> PAGE_SHIFT; 381 } 382