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 the device name as a string 211 */ 212 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 213 const struct dentry *dentry, 214 char *buffer, ssize_t buflen) 215 { 216 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 217 dentry, buffer, buflen); 218 } 219 220 /* 221 * Determine the actual block size (and log2 thereof) 222 */ 223 static inline 224 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 225 { 226 /* make sure blocksize is a power of two */ 227 if ((bsize & (bsize - 1)) || nrbitsp) { 228 unsigned char nrbits; 229 230 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 231 ; 232 bsize = 1 << nrbits; 233 if (nrbitsp) 234 *nrbitsp = nrbits; 235 } 236 237 return bsize; 238 } 239 240 /* 241 * Calculate the number of 512byte blocks used. 242 */ 243 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 244 { 245 blkcnt_t used = (tsize + 511) >> 9; 246 return (used > ULONG_MAX) ? ULONG_MAX : used; 247 } 248 249 /* 250 * Compute and set NFS server blocksize 251 */ 252 static inline 253 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 254 { 255 if (bsize < NFS_MIN_FILE_IO_SIZE) 256 bsize = NFS_DEF_FILE_IO_SIZE; 257 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 258 bsize = NFS_MAX_FILE_IO_SIZE; 259 260 return nfs_block_bits(bsize, nrbitsp); 261 } 262 263 /* 264 * Determine the maximum file size for a superblock 265 */ 266 static inline 267 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 268 { 269 sb->s_maxbytes = (loff_t)maxfilesize; 270 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 271 sb->s_maxbytes = MAX_LFS_FILESIZE; 272 } 273 274 /* 275 * Determine the number of bytes of data the page contains 276 */ 277 static inline 278 unsigned int nfs_page_length(struct page *page) 279 { 280 loff_t i_size = i_size_read(page->mapping->host); 281 282 if (i_size > 0) { 283 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 284 if (page->index < end_index) 285 return PAGE_CACHE_SIZE; 286 if (page->index == end_index) 287 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 288 } 289 return 0; 290 } 291 292 /* 293 * Determine the number of pages in an array of length 'len' and 294 * with a base offset of 'base' 295 */ 296 static inline 297 unsigned int nfs_page_array_len(unsigned int base, size_t len) 298 { 299 return ((unsigned long)len + (unsigned long)base + 300 PAGE_SIZE - 1) >> PAGE_SHIFT; 301 } 302 303 #define IPV6_SCOPE_DELIMITER '%' 304 305 /* 306 * Set the port number in an address. Be agnostic about the address 307 * family. 308 */ 309 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port) 310 { 311 struct sockaddr_in *ap = (struct sockaddr_in *)sap; 312 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap; 313 314 switch (sap->sa_family) { 315 case AF_INET: 316 ap->sin_port = htons(port); 317 break; 318 case AF_INET6: 319 ap6->sin6_port = htons(port); 320 break; 321 } 322 } 323