1 /* 2 * NFS internal definitions 3 */ 4 5 #include <linux/mount.h> 6 7 struct nfs_string; 8 9 /* Maximum number of readahead requests 10 * FIXME: this should really be a sysctl so that users may tune it to suit 11 * their needs. People that do NFS over a slow network, might for 12 * instance want to reduce it to something closer to 1 for improved 13 * interactive response. 14 */ 15 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 16 17 struct nfs_clone_mount { 18 const struct super_block *sb; 19 const struct dentry *dentry; 20 struct nfs_fh *fh; 21 struct nfs_fattr *fattr; 22 char *hostname; 23 char *mnt_path; 24 struct sockaddr *addr; 25 size_t addrlen; 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_storage address; 46 size_t addrlen; 47 char *hostname; 48 unsigned int version; 49 unsigned short port; 50 int protocol; 51 } mount_server; 52 53 struct { 54 struct sockaddr_storage address; 55 size_t addrlen; 56 char *hostname; 57 char *export_path; 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 *, u32); 67 extern struct nfs_client *nfs_find_client_next(struct nfs_client *); 68 extern struct nfs_server *nfs_create_server( 69 const struct nfs_parsed_mount_data *, 70 struct nfs_fh *); 71 extern struct nfs_server *nfs4_create_server( 72 const struct nfs_parsed_mount_data *, 73 struct nfs_fh *); 74 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 75 struct nfs_fh *); 76 extern void nfs_free_server(struct nfs_server *server); 77 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 78 struct nfs_fh *, 79 struct nfs_fattr *); 80 #ifdef CONFIG_PROC_FS 81 extern int __init nfs_fs_proc_init(void); 82 extern void nfs_fs_proc_exit(void); 83 #else 84 static inline int nfs_fs_proc_init(void) 85 { 86 return 0; 87 } 88 static inline void nfs_fs_proc_exit(void) 89 { 90 } 91 #endif 92 93 /* nfs4namespace.c */ 94 #ifdef CONFIG_NFS_V4 95 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 96 #else 97 static inline 98 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 99 { 100 return ERR_PTR(-ENOENT); 101 } 102 #endif 103 104 /* callback_xdr.c */ 105 extern struct svc_version nfs4_callback_version1; 106 107 /* pagelist.c */ 108 extern int __init nfs_init_nfspagecache(void); 109 extern void nfs_destroy_nfspagecache(void); 110 extern int __init nfs_init_readpagecache(void); 111 extern void nfs_destroy_readpagecache(void); 112 extern int __init nfs_init_writepagecache(void); 113 extern void nfs_destroy_writepagecache(void); 114 115 #ifdef CONFIG_NFS_DIRECTIO 116 extern int __init nfs_init_directcache(void); 117 extern void nfs_destroy_directcache(void); 118 #else 119 #define nfs_init_directcache() (0) 120 #define nfs_destroy_directcache() do {} while(0) 121 #endif 122 123 /* nfs2xdr.c */ 124 extern int nfs_stat_to_errno(int); 125 extern struct rpc_procinfo nfs_procedures[]; 126 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 127 128 /* nfs3xdr.c */ 129 extern struct rpc_procinfo nfs3_procedures[]; 130 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 131 132 /* nfs4xdr.c */ 133 #ifdef CONFIG_NFS_V4 134 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 135 #endif 136 137 /* nfs4proc.c */ 138 #ifdef CONFIG_NFS_V4 139 extern struct rpc_procinfo nfs4_procedures[]; 140 #endif 141 142 /* dir.c */ 143 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 144 145 /* inode.c */ 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 153 154 /* super.c */ 155 extern struct file_system_type nfs_xdev_fs_type; 156 #ifdef CONFIG_NFS_V4 157 extern struct file_system_type nfs4_xdev_fs_type; 158 extern struct file_system_type nfs4_referral_fs_type; 159 #endif 160 161 extern struct rpc_stat nfs_rpcstat; 162 163 extern int __init register_nfs_fs(void); 164 extern void __exit unregister_nfs_fs(void); 165 extern void nfs_sb_active(struct nfs_server *server); 166 extern void nfs_sb_deactive(struct nfs_server *server); 167 168 /* namespace.c */ 169 extern char *nfs_path(const char *base, 170 const struct dentry *droot, 171 const struct dentry *dentry, 172 char *buffer, ssize_t buflen); 173 174 /* getroot.c */ 175 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 176 #ifdef CONFIG_NFS_V4 177 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 178 179 extern int nfs4_path_walk(struct nfs_server *server, 180 struct nfs_fh *mntfh, 181 const char *path); 182 #endif 183 184 /* 185 * Determine the device name as a string 186 */ 187 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 188 const struct dentry *dentry, 189 char *buffer, ssize_t buflen) 190 { 191 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 192 dentry, buffer, buflen); 193 } 194 195 /* 196 * Determine the actual block size (and log2 thereof) 197 */ 198 static inline 199 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 200 { 201 /* make sure blocksize is a power of two */ 202 if ((bsize & (bsize - 1)) || nrbitsp) { 203 unsigned char nrbits; 204 205 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 206 ; 207 bsize = 1 << nrbits; 208 if (nrbitsp) 209 *nrbitsp = nrbits; 210 } 211 212 return bsize; 213 } 214 215 /* 216 * Calculate the number of 512byte blocks used. 217 */ 218 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 219 { 220 blkcnt_t used = (tsize + 511) >> 9; 221 return (used > ULONG_MAX) ? ULONG_MAX : used; 222 } 223 224 /* 225 * Compute and set NFS server blocksize 226 */ 227 static inline 228 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 229 { 230 if (bsize < NFS_MIN_FILE_IO_SIZE) 231 bsize = NFS_DEF_FILE_IO_SIZE; 232 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 233 bsize = NFS_MAX_FILE_IO_SIZE; 234 235 return nfs_block_bits(bsize, nrbitsp); 236 } 237 238 /* 239 * Determine the maximum file size for a superblock 240 */ 241 static inline 242 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 243 { 244 sb->s_maxbytes = (loff_t)maxfilesize; 245 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 246 sb->s_maxbytes = MAX_LFS_FILESIZE; 247 } 248 249 /* 250 * Determine the number of bytes of data the page contains 251 */ 252 static inline 253 unsigned int nfs_page_length(struct page *page) 254 { 255 loff_t i_size = i_size_read(page->mapping->host); 256 257 if (i_size > 0) { 258 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 259 if (page->index < end_index) 260 return PAGE_CACHE_SIZE; 261 if (page->index == end_index) 262 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 263 } 264 return 0; 265 } 266 267 /* 268 * Determine the number of pages in an array of length 'len' and 269 * with a base offset of 'base' 270 */ 271 static inline 272 unsigned int nfs_page_array_len(unsigned int base, size_t len) 273 { 274 return ((unsigned long)len + (unsigned long)base + 275 PAGE_SIZE - 1) >> PAGE_SHIFT; 276 } 277 278