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 * In-kernel mount arguments 53 */ 54 struct nfs_parsed_mount_data { 55 int flags; 56 int rsize, wsize; 57 int timeo, retrans; 58 int acregmin, acregmax, 59 acdirmin, acdirmax; 60 int namlen; 61 unsigned int options; 62 unsigned int bsize; 63 unsigned int auth_flavor_len; 64 rpc_authflavor_t auth_flavors[1]; 65 char *client_address; 66 unsigned int minorversion; 67 char *fscache_uniq; 68 69 struct { 70 struct sockaddr_storage address; 71 size_t addrlen; 72 char *hostname; 73 u32 version; 74 unsigned short port; 75 unsigned short protocol; 76 } mount_server; 77 78 struct { 79 struct sockaddr_storage address; 80 size_t addrlen; 81 char *hostname; 82 char *export_path; 83 unsigned short port; 84 unsigned short protocol; 85 } nfs_server; 86 87 struct security_mnt_opts lsm_opts; 88 }; 89 90 /* mount_clnt.c */ 91 struct nfs_mount_request { 92 struct sockaddr *sap; 93 size_t salen; 94 char *hostname; 95 char *dirpath; 96 u32 version; 97 unsigned short protocol; 98 struct nfs_fh *fh; 99 int noresvport; 100 unsigned int *auth_flav_len; 101 rpc_authflavor_t *auth_flavs; 102 }; 103 104 extern int nfs_mount(struct nfs_mount_request *info); 105 extern void nfs_umount(const struct nfs_mount_request *info); 106 107 /* client.c */ 108 extern struct rpc_program nfs_program; 109 110 extern void nfs_put_client(struct nfs_client *); 111 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 112 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 113 extern struct nfs_server *nfs_create_server( 114 const struct nfs_parsed_mount_data *, 115 struct nfs_fh *); 116 extern struct nfs_server *nfs4_create_server( 117 const struct nfs_parsed_mount_data *, 118 struct nfs_fh *); 119 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 120 struct nfs_fh *); 121 extern void nfs_free_server(struct nfs_server *server); 122 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 123 struct nfs_fh *, 124 struct nfs_fattr *); 125 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 126 extern int nfs4_check_client_ready(struct nfs_client *clp); 127 #ifdef CONFIG_PROC_FS 128 extern int __init nfs_fs_proc_init(void); 129 extern void nfs_fs_proc_exit(void); 130 #else 131 static inline int nfs_fs_proc_init(void) 132 { 133 return 0; 134 } 135 static inline void nfs_fs_proc_exit(void) 136 { 137 } 138 #endif 139 140 /* nfs4namespace.c */ 141 #ifdef CONFIG_NFS_V4 142 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 143 #else 144 static inline 145 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 146 { 147 return ERR_PTR(-ENOENT); 148 } 149 #endif 150 151 /* callback_xdr.c */ 152 extern struct svc_version nfs4_callback_version1; 153 154 /* pagelist.c */ 155 extern int __init nfs_init_nfspagecache(void); 156 extern void nfs_destroy_nfspagecache(void); 157 extern int __init nfs_init_readpagecache(void); 158 extern void nfs_destroy_readpagecache(void); 159 extern int __init nfs_init_writepagecache(void); 160 extern void nfs_destroy_writepagecache(void); 161 162 extern int __init nfs_init_directcache(void); 163 extern void nfs_destroy_directcache(void); 164 165 /* nfs2xdr.c */ 166 extern int nfs_stat_to_errno(int); 167 extern struct rpc_procinfo nfs_procedures[]; 168 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 169 170 /* nfs3xdr.c */ 171 extern struct rpc_procinfo nfs3_procedures[]; 172 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 173 174 /* nfs4proc.c */ 175 static inline void nfs4_restart_rpc(struct rpc_task *task, 176 const struct nfs_client *clp) 177 { 178 #ifdef CONFIG_NFS_V4_1 179 if (nfs4_has_session(clp) && 180 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) { 181 rpc_restart_call_prepare(task); 182 return; 183 } 184 #endif /* CONFIG_NFS_V4_1 */ 185 rpc_restart_call(task); 186 } 187 188 /* nfs4xdr.c */ 189 #ifdef CONFIG_NFS_V4 190 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 191 #endif 192 193 /* nfs4proc.c */ 194 #ifdef CONFIG_NFS_V4 195 extern struct rpc_procinfo nfs4_procedures[]; 196 #endif 197 198 /* proc.c */ 199 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 200 201 /* dir.c */ 202 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 203 204 /* inode.c */ 205 extern struct workqueue_struct *nfsiod_workqueue; 206 extern struct inode *nfs_alloc_inode(struct super_block *sb); 207 extern void nfs_destroy_inode(struct inode *); 208 extern int nfs_write_inode(struct inode *,int); 209 extern void nfs_clear_inode(struct inode *); 210 #ifdef CONFIG_NFS_V4 211 extern void nfs4_clear_inode(struct inode *); 212 #endif 213 void nfs_zap_acl_cache(struct inode *inode); 214 extern int nfs_wait_bit_killable(void *word); 215 216 /* super.c */ 217 extern struct file_system_type nfs_xdev_fs_type; 218 #ifdef CONFIG_NFS_V4 219 extern struct file_system_type nfs4_xdev_fs_type; 220 extern struct file_system_type nfs4_referral_fs_type; 221 #endif 222 223 extern struct rpc_stat nfs_rpcstat; 224 225 extern int __init register_nfs_fs(void); 226 extern void __exit unregister_nfs_fs(void); 227 extern void nfs_sb_active(struct super_block *sb); 228 extern void nfs_sb_deactive(struct super_block *sb); 229 230 /* namespace.c */ 231 extern char *nfs_path(const char *base, 232 const struct dentry *droot, 233 const struct dentry *dentry, 234 char *buffer, ssize_t buflen); 235 236 /* getroot.c */ 237 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 238 #ifdef CONFIG_NFS_V4 239 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 240 241 extern int nfs4_path_walk(struct nfs_server *server, 242 struct nfs_fh *mntfh, 243 const char *path); 244 #endif 245 246 /* read.c */ 247 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 248 249 /* write.c */ 250 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 251 #ifdef CONFIG_MIGRATION 252 extern int nfs_migrate_page(struct address_space *, 253 struct page *, struct page *); 254 #else 255 #define nfs_migrate_page NULL 256 #endif 257 258 /* nfs4proc.c */ 259 extern int _nfs4_call_sync(struct nfs_server *server, 260 struct rpc_message *msg, 261 struct nfs4_sequence_args *args, 262 struct nfs4_sequence_res *res, 263 int cache_reply); 264 extern int _nfs4_call_sync_session(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); 269 270 #ifdef CONFIG_NFS_V4_1 271 extern void nfs41_sequence_free_slot(const struct nfs_client *, 272 struct nfs4_sequence_res *res); 273 #endif /* CONFIG_NFS_V4_1 */ 274 275 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp, 276 struct nfs4_sequence_res *res) 277 { 278 #ifdef CONFIG_NFS_V4_1 279 if (nfs4_has_session(clp)) 280 nfs41_sequence_free_slot(clp, res); 281 #endif /* CONFIG_NFS_V4_1 */ 282 } 283 284 /* 285 * Determine the device name as a string 286 */ 287 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 288 const struct dentry *dentry, 289 char *buffer, ssize_t buflen) 290 { 291 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 292 dentry, buffer, buflen); 293 } 294 295 /* 296 * Determine the actual block size (and log2 thereof) 297 */ 298 static inline 299 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 300 { 301 /* make sure blocksize is a power of two */ 302 if ((bsize & (bsize - 1)) || nrbitsp) { 303 unsigned char nrbits; 304 305 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 306 ; 307 bsize = 1 << nrbits; 308 if (nrbitsp) 309 *nrbitsp = nrbits; 310 } 311 312 return bsize; 313 } 314 315 /* 316 * Calculate the number of 512byte blocks used. 317 */ 318 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 319 { 320 blkcnt_t used = (tsize + 511) >> 9; 321 return (used > ULONG_MAX) ? ULONG_MAX : used; 322 } 323 324 /* 325 * Compute and set NFS server blocksize 326 */ 327 static inline 328 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 329 { 330 if (bsize < NFS_MIN_FILE_IO_SIZE) 331 bsize = NFS_DEF_FILE_IO_SIZE; 332 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 333 bsize = NFS_MAX_FILE_IO_SIZE; 334 335 return nfs_block_bits(bsize, nrbitsp); 336 } 337 338 /* 339 * Determine the maximum file size for a superblock 340 */ 341 static inline 342 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 343 { 344 sb->s_maxbytes = (loff_t)maxfilesize; 345 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 346 sb->s_maxbytes = MAX_LFS_FILESIZE; 347 } 348 349 /* 350 * Determine the number of bytes of data the page contains 351 */ 352 static inline 353 unsigned int nfs_page_length(struct page *page) 354 { 355 loff_t i_size = i_size_read(page->mapping->host); 356 357 if (i_size > 0) { 358 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 359 if (page->index < end_index) 360 return PAGE_CACHE_SIZE; 361 if (page->index == end_index) 362 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 363 } 364 return 0; 365 } 366 367 /* 368 * Determine the number of pages in an array of length 'len' and 369 * with a base offset of 'base' 370 */ 371 static inline 372 unsigned int nfs_page_array_len(unsigned int base, size_t len) 373 { 374 return ((unsigned long)len + (unsigned long)base + 375 PAGE_SIZE - 1) >> PAGE_SHIFT; 376 } 377