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 #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(struct shrinker *shrink, 209 int nr_to_scan, gfp_t gfp_mask); 210 211 /* inode.c */ 212 extern struct workqueue_struct *nfsiod_workqueue; 213 extern struct inode *nfs_alloc_inode(struct super_block *sb); 214 extern void nfs_destroy_inode(struct inode *); 215 extern int nfs_write_inode(struct inode *, struct writeback_control *); 216 extern void nfs_evict_inode(struct inode *); 217 #ifdef CONFIG_NFS_V4 218 extern void nfs4_evict_inode(struct inode *); 219 #endif 220 void nfs_zap_acl_cache(struct inode *inode); 221 extern int nfs_wait_bit_killable(void *word); 222 223 /* super.c */ 224 extern struct file_system_type nfs_xdev_fs_type; 225 #ifdef CONFIG_NFS_V4 226 extern struct file_system_type nfs4_xdev_fs_type; 227 extern struct file_system_type nfs4_referral_fs_type; 228 #endif 229 230 extern struct rpc_stat nfs_rpcstat; 231 232 extern int __init register_nfs_fs(void); 233 extern void __exit unregister_nfs_fs(void); 234 extern void nfs_sb_active(struct super_block *sb); 235 extern void nfs_sb_deactive(struct super_block *sb); 236 237 /* namespace.c */ 238 extern char *nfs_path(const char *base, 239 const struct dentry *droot, 240 const struct dentry *dentry, 241 char *buffer, ssize_t buflen); 242 243 /* getroot.c */ 244 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 245 #ifdef CONFIG_NFS_V4 246 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 247 248 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh); 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 /* 276 * Determine the device name as a string 277 */ 278 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 279 const struct dentry *dentry, 280 char *buffer, ssize_t buflen) 281 { 282 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 283 dentry, buffer, buflen); 284 } 285 286 /* 287 * Determine the actual block size (and log2 thereof) 288 */ 289 static inline 290 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 291 { 292 /* make sure blocksize is a power of two */ 293 if ((bsize & (bsize - 1)) || nrbitsp) { 294 unsigned char nrbits; 295 296 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 297 ; 298 bsize = 1 << nrbits; 299 if (nrbitsp) 300 *nrbitsp = nrbits; 301 } 302 303 return bsize; 304 } 305 306 /* 307 * Calculate the number of 512byte blocks used. 308 */ 309 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 310 { 311 blkcnt_t used = (tsize + 511) >> 9; 312 return (used > ULONG_MAX) ? ULONG_MAX : used; 313 } 314 315 /* 316 * Compute and set NFS server blocksize 317 */ 318 static inline 319 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 320 { 321 if (bsize < NFS_MIN_FILE_IO_SIZE) 322 bsize = NFS_DEF_FILE_IO_SIZE; 323 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 324 bsize = NFS_MAX_FILE_IO_SIZE; 325 326 return nfs_block_bits(bsize, nrbitsp); 327 } 328 329 /* 330 * Determine the maximum file size for a superblock 331 */ 332 static inline 333 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 334 { 335 sb->s_maxbytes = (loff_t)maxfilesize; 336 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 337 sb->s_maxbytes = MAX_LFS_FILESIZE; 338 } 339 340 /* 341 * Determine the number of bytes of data the page contains 342 */ 343 static inline 344 unsigned int nfs_page_length(struct page *page) 345 { 346 loff_t i_size = i_size_read(page->mapping->host); 347 348 if (i_size > 0) { 349 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 350 if (page->index < end_index) 351 return PAGE_CACHE_SIZE; 352 if (page->index == end_index) 353 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 354 } 355 return 0; 356 } 357 358 /* 359 * Determine the number of pages in an array of length 'len' and 360 * with a base offset of 'base' 361 */ 362 static inline 363 unsigned int nfs_page_array_len(unsigned int base, size_t len) 364 { 365 return ((unsigned long)len + (unsigned long)base + 366 PAGE_SIZE - 1) >> PAGE_SHIFT; 367 } 368 369 /* 370 * Helper for restarting RPC calls in the possible presence of NFSv4.1 371 * sessions. 372 */ 373 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp) 374 { 375 if (nfs4_has_session(clp)) 376 return rpc_restart_call_prepare(task); 377 return rpc_restart_call(task); 378 } 379