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