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 extern struct file_system_type nfs_xdev_fs_type; 157 #ifdef CONFIG_NFS_V4 158 extern struct file_system_type nfs4_xdev_fs_type; 159 extern struct file_system_type nfs4_referral_fs_type; 160 #endif 161 162 extern struct rpc_stat nfs_rpcstat; 163 164 extern int __init register_nfs_fs(void); 165 extern void __exit unregister_nfs_fs(void); 166 extern void nfs_sb_active(struct nfs_server *server); 167 extern void nfs_sb_deactive(struct nfs_server *server); 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