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_in *addr; 25 rpc_authflavor_t authflavor; 26 }; 27 28 /* 29 * In-kernel mount arguments 30 */ 31 struct nfs_parsed_mount_data { 32 int flags; 33 int rsize, wsize; 34 int timeo, retrans; 35 int acregmin, acregmax, 36 acdirmin, acdirmax; 37 int namlen; 38 unsigned int bsize; 39 unsigned int auth_flavor_len; 40 rpc_authflavor_t auth_flavors[1]; 41 char *client_address; 42 43 struct { 44 struct sockaddr_in address; 45 char *hostname; 46 unsigned int program; 47 unsigned int version; 48 unsigned short port; 49 int protocol; 50 } mount_server; 51 52 struct { 53 struct sockaddr_in address; 54 char *hostname; 55 char *export_path; 56 unsigned int program; 57 int protocol; 58 } nfs_server; 59 }; 60 61 /* client.c */ 62 extern struct rpc_program nfs_program; 63 64 extern void nfs_put_client(struct nfs_client *); 65 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int); 66 extern struct nfs_server *nfs_create_server( 67 const struct nfs_parsed_mount_data *, 68 struct nfs_fh *); 69 extern struct nfs_server *nfs4_create_server( 70 const struct nfs_parsed_mount_data *, 71 struct nfs_fh *); 72 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 73 struct nfs_fh *); 74 extern void nfs_free_server(struct nfs_server *server); 75 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 76 struct nfs_fh *, 77 struct nfs_fattr *); 78 #ifdef CONFIG_PROC_FS 79 extern int __init nfs_fs_proc_init(void); 80 extern void nfs_fs_proc_exit(void); 81 #else 82 static inline int nfs_fs_proc_init(void) 83 { 84 return 0; 85 } 86 static inline void nfs_fs_proc_exit(void) 87 { 88 } 89 #endif 90 91 /* nfs4namespace.c */ 92 #ifdef CONFIG_NFS_V4 93 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 94 #else 95 static inline 96 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 97 { 98 return ERR_PTR(-ENOENT); 99 } 100 #endif 101 102 /* callback_xdr.c */ 103 extern struct svc_version nfs4_callback_version1; 104 105 /* pagelist.c */ 106 extern int __init nfs_init_nfspagecache(void); 107 extern void nfs_destroy_nfspagecache(void); 108 extern int __init nfs_init_readpagecache(void); 109 extern void nfs_destroy_readpagecache(void); 110 extern int __init nfs_init_writepagecache(void); 111 extern void nfs_destroy_writepagecache(void); 112 113 #ifdef CONFIG_NFS_DIRECTIO 114 extern int __init nfs_init_directcache(void); 115 extern void nfs_destroy_directcache(void); 116 #else 117 #define nfs_init_directcache() (0) 118 #define nfs_destroy_directcache() do {} while(0) 119 #endif 120 121 /* nfs2xdr.c */ 122 extern int nfs_stat_to_errno(int); 123 extern struct rpc_procinfo nfs_procedures[]; 124 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 125 126 /* nfs3xdr.c */ 127 extern struct rpc_procinfo nfs3_procedures[]; 128 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 129 130 /* nfs4xdr.c */ 131 #ifdef CONFIG_NFS_V4 132 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 133 #endif 134 135 /* nfs4proc.c */ 136 #ifdef CONFIG_NFS_V4 137 extern struct rpc_procinfo nfs4_procedures[]; 138 #endif 139 140 /* dir.c */ 141 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 142 143 /* inode.c */ 144 extern struct inode *nfs_alloc_inode(struct super_block *sb); 145 extern void nfs_destroy_inode(struct inode *); 146 extern int nfs_write_inode(struct inode *,int); 147 extern void nfs_clear_inode(struct inode *); 148 #ifdef CONFIG_NFS_V4 149 extern void nfs4_clear_inode(struct inode *); 150 #endif 151 152 /* super.c */ 153 extern struct file_system_type nfs_xdev_fs_type; 154 #ifdef CONFIG_NFS_V4 155 extern struct file_system_type nfs4_xdev_fs_type; 156 extern struct file_system_type nfs4_referral_fs_type; 157 #endif 158 159 extern struct rpc_stat nfs_rpcstat; 160 161 extern int __init register_nfs_fs(void); 162 extern void __exit unregister_nfs_fs(void); 163 164 /* namespace.c */ 165 extern char *nfs_path(const char *base, 166 const struct dentry *droot, 167 const struct dentry *dentry, 168 char *buffer, ssize_t buflen); 169 170 /* getroot.c */ 171 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 172 #ifdef CONFIG_NFS_V4 173 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 174 175 extern int nfs4_path_walk(struct nfs_server *server, 176 struct nfs_fh *mntfh, 177 const char *path); 178 #endif 179 180 /* 181 * Determine the device name as a string 182 */ 183 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 184 const struct dentry *dentry, 185 char *buffer, ssize_t buflen) 186 { 187 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 188 dentry, buffer, buflen); 189 } 190 191 /* 192 * Determine the actual block size (and log2 thereof) 193 */ 194 static inline 195 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 196 { 197 /* make sure blocksize is a power of two */ 198 if ((bsize & (bsize - 1)) || nrbitsp) { 199 unsigned char nrbits; 200 201 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 202 ; 203 bsize = 1 << nrbits; 204 if (nrbitsp) 205 *nrbitsp = nrbits; 206 } 207 208 return bsize; 209 } 210 211 /* 212 * Calculate the number of 512byte blocks used. 213 */ 214 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 215 { 216 blkcnt_t used = (tsize + 511) >> 9; 217 return (used > ULONG_MAX) ? ULONG_MAX : used; 218 } 219 220 /* 221 * Compute and set NFS server blocksize 222 */ 223 static inline 224 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 225 { 226 if (bsize < NFS_MIN_FILE_IO_SIZE) 227 bsize = NFS_DEF_FILE_IO_SIZE; 228 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 229 bsize = NFS_MAX_FILE_IO_SIZE; 230 231 return nfs_block_bits(bsize, nrbitsp); 232 } 233 234 /* 235 * Determine the maximum file size for a superblock 236 */ 237 static inline 238 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 239 { 240 sb->s_maxbytes = (loff_t)maxfilesize; 241 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 242 sb->s_maxbytes = MAX_LFS_FILESIZE; 243 } 244 245 /* 246 * Determine the number of bytes of data the page contains 247 */ 248 static inline 249 unsigned int nfs_page_length(struct page *page) 250 { 251 loff_t i_size = i_size_read(page->mapping->host); 252 253 if (i_size > 0) { 254 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 255 if (page->index < end_index) 256 return PAGE_CACHE_SIZE; 257 if (page->index == end_index) 258 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 259 } 260 return 0; 261 } 262 263 /* 264 * Determine the number of pages in an array of length 'len' and 265 * with a base offset of 'base' 266 */ 267 static inline 268 unsigned int nfs_page_array_len(unsigned int base, size_t len) 269 { 270 return ((unsigned long)len + (unsigned long)base + 271 PAGE_SIZE - 1) >> PAGE_SHIFT; 272 } 273 274