1 /* 2 * NFS internal definitions 3 */ 4 5 #include <linux/mount.h> 6 7 struct nfs_string; 8 struct nfs4_mount_data; 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_in *addr; 26 rpc_authflavor_t authflavor; 27 }; 28 29 /* 30 * In-kernel mount arguments 31 */ 32 struct nfs_parsed_mount_data { 33 int flags; 34 int rsize, wsize; 35 int timeo, retrans; 36 int acregmin, acregmax, 37 acdirmin, acdirmax; 38 int namlen; 39 unsigned int bsize; 40 unsigned int auth_flavor_len; 41 rpc_authflavor_t auth_flavors[1]; 42 char *client_address; 43 44 struct { 45 struct sockaddr_in address; 46 char *hostname; 47 unsigned int program; 48 unsigned int version; 49 unsigned short port; 50 int protocol; 51 } mount_server; 52 53 struct { 54 struct sockaddr_in address; 55 char *hostname; 56 char *export_path; 57 unsigned int program; 58 int protocol; 59 } nfs_server; 60 }; 61 62 /* client.c */ 63 extern struct rpc_program nfs_program; 64 65 extern void nfs_put_client(struct nfs_client *); 66 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int); 67 extern struct nfs_server *nfs_create_server( 68 const struct nfs_parsed_mount_data *, 69 struct nfs_fh *); 70 extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *, 71 const char *, 72 const struct sockaddr_in *, 73 const char *, 74 const char *, 75 rpc_authflavor_t, 76 struct nfs_fh *); 77 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 78 struct nfs_fh *); 79 extern void nfs_free_server(struct nfs_server *server); 80 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 81 struct nfs_fh *, 82 struct nfs_fattr *); 83 #ifdef CONFIG_PROC_FS 84 extern int __init nfs_fs_proc_init(void); 85 extern void nfs_fs_proc_exit(void); 86 #else 87 static inline int nfs_fs_proc_init(void) 88 { 89 return 0; 90 } 91 static inline void nfs_fs_proc_exit(void) 92 { 93 } 94 #endif 95 96 /* nfs4namespace.c */ 97 #ifdef CONFIG_NFS_V4 98 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 99 #else 100 static inline 101 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 102 { 103 return ERR_PTR(-ENOENT); 104 } 105 #endif 106 107 /* callback_xdr.c */ 108 extern struct svc_version nfs4_callback_version1; 109 110 /* pagelist.c */ 111 extern int __init nfs_init_nfspagecache(void); 112 extern void nfs_destroy_nfspagecache(void); 113 extern int __init nfs_init_readpagecache(void); 114 extern void nfs_destroy_readpagecache(void); 115 extern int __init nfs_init_writepagecache(void); 116 extern void nfs_destroy_writepagecache(void); 117 118 #ifdef CONFIG_NFS_DIRECTIO 119 extern int __init nfs_init_directcache(void); 120 extern void nfs_destroy_directcache(void); 121 #else 122 #define nfs_init_directcache() (0) 123 #define nfs_destroy_directcache() do {} while(0) 124 #endif 125 126 /* nfs2xdr.c */ 127 extern int nfs_stat_to_errno(int); 128 extern struct rpc_procinfo nfs_procedures[]; 129 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 130 131 /* nfs3xdr.c */ 132 extern struct rpc_procinfo nfs3_procedures[]; 133 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 134 135 /* nfs4xdr.c */ 136 #ifdef CONFIG_NFS_V4 137 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 138 #endif 139 140 /* nfs4proc.c */ 141 #ifdef CONFIG_NFS_V4 142 extern struct rpc_procinfo nfs4_procedures[]; 143 #endif 144 145 /* dir.c */ 146 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 147 148 /* inode.c */ 149 extern struct inode *nfs_alloc_inode(struct super_block *sb); 150 extern void nfs_destroy_inode(struct inode *); 151 extern int nfs_write_inode(struct inode *,int); 152 extern void nfs_clear_inode(struct inode *); 153 #ifdef CONFIG_NFS_V4 154 extern void nfs4_clear_inode(struct inode *); 155 #endif 156 157 /* super.c */ 158 extern struct file_system_type nfs_xdev_fs_type; 159 #ifdef CONFIG_NFS_V4 160 extern struct file_system_type nfs4_xdev_fs_type; 161 extern struct file_system_type nfs4_referral_fs_type; 162 #endif 163 164 extern struct rpc_stat nfs_rpcstat; 165 166 extern int __init register_nfs_fs(void); 167 extern void __exit unregister_nfs_fs(void); 168 169 /* namespace.c */ 170 extern char *nfs_path(const char *base, 171 const struct dentry *droot, 172 const struct dentry *dentry, 173 char *buffer, ssize_t buflen); 174 175 /* getroot.c */ 176 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 177 #ifdef CONFIG_NFS_V4 178 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 179 180 extern int nfs4_path_walk(struct nfs_server *server, 181 struct nfs_fh *mntfh, 182 const char *path); 183 #endif 184 185 /* 186 * Determine the device name as a string 187 */ 188 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 189 const struct dentry *dentry, 190 char *buffer, ssize_t buflen) 191 { 192 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 193 dentry, buffer, buflen); 194 } 195 196 /* 197 * Determine the actual block size (and log2 thereof) 198 */ 199 static inline 200 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 201 { 202 /* make sure blocksize is a power of two */ 203 if ((bsize & (bsize - 1)) || nrbitsp) { 204 unsigned char nrbits; 205 206 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 207 ; 208 bsize = 1 << nrbits; 209 if (nrbitsp) 210 *nrbitsp = nrbits; 211 } 212 213 return bsize; 214 } 215 216 /* 217 * Calculate the number of 512byte blocks used. 218 */ 219 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 220 { 221 blkcnt_t used = (tsize + 511) >> 9; 222 return (used > ULONG_MAX) ? ULONG_MAX : used; 223 } 224 225 /* 226 * Compute and set NFS server blocksize 227 */ 228 static inline 229 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 230 { 231 if (bsize < NFS_MIN_FILE_IO_SIZE) 232 bsize = NFS_DEF_FILE_IO_SIZE; 233 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 234 bsize = NFS_MAX_FILE_IO_SIZE; 235 236 return nfs_block_bits(bsize, nrbitsp); 237 } 238 239 /* 240 * Determine the maximum file size for a superblock 241 */ 242 static inline 243 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 244 { 245 sb->s_maxbytes = (loff_t)maxfilesize; 246 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 247 sb->s_maxbytes = MAX_LFS_FILESIZE; 248 } 249 250 /* 251 * Determine the number of bytes of data the page contains 252 */ 253 static inline 254 unsigned int nfs_page_length(struct page *page) 255 { 256 loff_t i_size = i_size_read(page->mapping->host); 257 258 if (i_size > 0) { 259 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 260 if (page->index < end_index) 261 return PAGE_CACHE_SIZE; 262 if (page->index == end_index) 263 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 264 } 265 return 0; 266 } 267 268 /* 269 * Determine the number of pages in an array of length 'len' and 270 * with a base offset of 'base' 271 */ 272 static inline 273 unsigned int nfs_page_array_len(unsigned int base, size_t len) 274 { 275 return ((unsigned long)len + (unsigned long)base + 276 PAGE_SIZE - 1) >> PAGE_SHIFT; 277 } 278 279