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