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