1 /* 2 * NFS internal definitions 3 */ 4 5 #include <linux/mount.h> 6 #include <linux/security.h> 7 8 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 9 10 struct nfs_string; 11 12 /* Maximum number of readahead requests 13 * FIXME: this should really be a sysctl so that users may tune it to suit 14 * their needs. People that do NFS over a slow network, might for 15 * instance want to reduce it to something closer to 1 for improved 16 * interactive response. 17 */ 18 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 19 20 struct nfs_clone_mount { 21 const struct super_block *sb; 22 const struct dentry *dentry; 23 struct nfs_fh *fh; 24 struct nfs_fattr *fattr; 25 char *hostname; 26 char *mnt_path; 27 struct sockaddr *addr; 28 size_t addrlen; 29 rpc_authflavor_t authflavor; 30 }; 31 32 /* 33 * In-kernel mount arguments 34 */ 35 struct nfs_parsed_mount_data { 36 int flags; 37 int rsize, wsize; 38 int timeo, retrans; 39 int acregmin, acregmax, 40 acdirmin, acdirmax; 41 int namlen; 42 unsigned int options; 43 unsigned int bsize; 44 unsigned int auth_flavor_len; 45 rpc_authflavor_t auth_flavors[1]; 46 char *client_address; 47 unsigned int minorversion; 48 char *fscache_uniq; 49 50 struct { 51 struct sockaddr_storage address; 52 size_t addrlen; 53 char *hostname; 54 u32 version; 55 unsigned short port; 56 unsigned short protocol; 57 } mount_server; 58 59 struct { 60 struct sockaddr_storage address; 61 size_t addrlen; 62 char *hostname; 63 char *export_path; 64 unsigned short port; 65 unsigned short protocol; 66 } nfs_server; 67 68 struct security_mnt_opts lsm_opts; 69 }; 70 71 /* mount_clnt.c */ 72 struct nfs_mount_request { 73 struct sockaddr *sap; 74 size_t salen; 75 char *hostname; 76 char *dirpath; 77 u32 version; 78 unsigned short protocol; 79 struct nfs_fh *fh; 80 int noresvport; 81 }; 82 83 extern int nfs_mount(struct nfs_mount_request *info); 84 85 /* client.c */ 86 extern struct rpc_program nfs_program; 87 88 extern void nfs_put_client(struct nfs_client *); 89 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); 90 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 91 extern struct nfs_server *nfs_create_server( 92 const struct nfs_parsed_mount_data *, 93 struct nfs_fh *); 94 extern struct nfs_server *nfs4_create_server( 95 const struct nfs_parsed_mount_data *, 96 struct nfs_fh *); 97 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 98 struct nfs_fh *); 99 extern void nfs_free_server(struct nfs_server *server); 100 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 101 struct nfs_fh *, 102 struct nfs_fattr *); 103 #ifdef CONFIG_PROC_FS 104 extern int __init nfs_fs_proc_init(void); 105 extern void nfs_fs_proc_exit(void); 106 #else 107 static inline int nfs_fs_proc_init(void) 108 { 109 return 0; 110 } 111 static inline void nfs_fs_proc_exit(void) 112 { 113 } 114 #endif 115 116 /* nfs4namespace.c */ 117 #ifdef CONFIG_NFS_V4 118 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 119 #else 120 static inline 121 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 122 { 123 return ERR_PTR(-ENOENT); 124 } 125 #endif 126 127 /* callback_xdr.c */ 128 extern struct svc_version nfs4_callback_version1; 129 130 /* pagelist.c */ 131 extern int __init nfs_init_nfspagecache(void); 132 extern void nfs_destroy_nfspagecache(void); 133 extern int __init nfs_init_readpagecache(void); 134 extern void nfs_destroy_readpagecache(void); 135 extern int __init nfs_init_writepagecache(void); 136 extern void nfs_destroy_writepagecache(void); 137 138 extern int __init nfs_init_directcache(void); 139 extern void nfs_destroy_directcache(void); 140 141 /* nfs2xdr.c */ 142 extern int nfs_stat_to_errno(int); 143 extern struct rpc_procinfo nfs_procedures[]; 144 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 145 146 /* nfs3xdr.c */ 147 extern struct rpc_procinfo nfs3_procedures[]; 148 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 149 150 /* nfs4xdr.c */ 151 #ifdef CONFIG_NFS_V4 152 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 153 #endif 154 155 /* nfs4proc.c */ 156 #ifdef CONFIG_NFS_V4 157 extern struct rpc_procinfo nfs4_procedures[]; 158 #endif 159 160 /* proc.c */ 161 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 162 163 /* dir.c */ 164 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 165 166 /* inode.c */ 167 extern struct workqueue_struct *nfsiod_workqueue; 168 extern struct inode *nfs_alloc_inode(struct super_block *sb); 169 extern void nfs_destroy_inode(struct inode *); 170 extern int nfs_write_inode(struct inode *,int); 171 extern void nfs_clear_inode(struct inode *); 172 #ifdef CONFIG_NFS_V4 173 extern void nfs4_clear_inode(struct inode *); 174 #endif 175 void nfs_zap_acl_cache(struct inode *inode); 176 extern int nfs_wait_bit_killable(void *word); 177 178 /* super.c */ 179 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *); 180 extern struct file_system_type nfs_xdev_fs_type; 181 #ifdef CONFIG_NFS_V4 182 extern struct file_system_type nfs4_xdev_fs_type; 183 extern struct file_system_type nfs4_referral_fs_type; 184 #endif 185 186 extern struct rpc_stat nfs_rpcstat; 187 188 extern int __init register_nfs_fs(void); 189 extern void __exit unregister_nfs_fs(void); 190 extern void nfs_sb_active(struct super_block *sb); 191 extern void nfs_sb_deactive(struct super_block *sb); 192 193 /* namespace.c */ 194 extern char *nfs_path(const char *base, 195 const struct dentry *droot, 196 const struct dentry *dentry, 197 char *buffer, ssize_t buflen); 198 199 /* getroot.c */ 200 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 201 #ifdef CONFIG_NFS_V4 202 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 203 204 extern int nfs4_path_walk(struct nfs_server *server, 205 struct nfs_fh *mntfh, 206 const char *path); 207 #endif 208 209 /* 210 * Determine if sessions are in use. 211 */ 212 static inline int nfs4_has_session(const struct nfs_client *clp) 213 { 214 #ifdef CONFIG_NFS_V4_1 215 if (clp->cl_session) 216 return 1; 217 #endif /* CONFIG_NFS_V4_1 */ 218 return 0; 219 } 220 221 /* 222 * Determine the device name as a string 223 */ 224 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 225 const struct dentry *dentry, 226 char *buffer, ssize_t buflen) 227 { 228 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 229 dentry, buffer, buflen); 230 } 231 232 /* 233 * Determine the actual block size (and log2 thereof) 234 */ 235 static inline 236 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 237 { 238 /* make sure blocksize is a power of two */ 239 if ((bsize & (bsize - 1)) || nrbitsp) { 240 unsigned char nrbits; 241 242 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 243 ; 244 bsize = 1 << nrbits; 245 if (nrbitsp) 246 *nrbitsp = nrbits; 247 } 248 249 return bsize; 250 } 251 252 /* 253 * Calculate the number of 512byte blocks used. 254 */ 255 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 256 { 257 blkcnt_t used = (tsize + 511) >> 9; 258 return (used > ULONG_MAX) ? ULONG_MAX : used; 259 } 260 261 /* 262 * Compute and set NFS server blocksize 263 */ 264 static inline 265 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 266 { 267 if (bsize < NFS_MIN_FILE_IO_SIZE) 268 bsize = NFS_DEF_FILE_IO_SIZE; 269 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 270 bsize = NFS_MAX_FILE_IO_SIZE; 271 272 return nfs_block_bits(bsize, nrbitsp); 273 } 274 275 /* 276 * Determine the maximum file size for a superblock 277 */ 278 static inline 279 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 280 { 281 sb->s_maxbytes = (loff_t)maxfilesize; 282 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 283 sb->s_maxbytes = MAX_LFS_FILESIZE; 284 } 285 286 /* 287 * Determine the number of bytes of data the page contains 288 */ 289 static inline 290 unsigned int nfs_page_length(struct page *page) 291 { 292 loff_t i_size = i_size_read(page->mapping->host); 293 294 if (i_size > 0) { 295 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 296 if (page->index < end_index) 297 return PAGE_CACHE_SIZE; 298 if (page->index == end_index) 299 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 300 } 301 return 0; 302 } 303 304 /* 305 * Determine the number of pages in an array of length 'len' and 306 * with a base offset of 'base' 307 */ 308 static inline 309 unsigned int nfs_page_array_len(unsigned int base, size_t len) 310 { 311 return ((unsigned long)len + (unsigned long)base + 312 PAGE_SIZE - 1) >> PAGE_SHIFT; 313 } 314 315 #define IPV6_SCOPE_DELIMITER '%' 316 317 /* 318 * Set the port number in an address. Be agnostic about the address 319 * family. 320 */ 321 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) 322 { 323 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 324 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; 325 326 switch (sap->sa_family) { 327 case AF_INET: 328 ap->sin_port = htons(port); 329 break; 330 case AF_INET6: 331 ap6->sin6_port = htons(port); 332 break; 333 } 334 } 335