1 /* 2 * NFS internal definitions 3 */ 4 5 #include <linux/mount.h> 6 7 struct nfs_string; 8 struct nfs_mount_data; 9 struct nfs4_mount_data; 10 11 /* Maximum number of readahead requests 12 * FIXME: this should really be a sysctl so that users may tune it to suit 13 * their needs. People that do NFS over a slow network, might for 14 * instance want to reduce it to something closer to 1 for improved 15 * interactive response. 16 */ 17 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 18 19 struct nfs_clone_mount { 20 const struct super_block *sb; 21 const struct dentry *dentry; 22 struct nfs_fh *fh; 23 struct nfs_fattr *fattr; 24 char *hostname; 25 char *mnt_path; 26 struct sockaddr_in *addr; 27 rpc_authflavor_t authflavor; 28 }; 29 30 /* client.c */ 31 extern struct rpc_program nfs_program; 32 33 extern void nfs_put_client(struct nfs_client *); 34 extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int); 35 extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *, 36 struct nfs_fh *); 37 extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *, 38 const char *, 39 const struct sockaddr_in *, 40 const char *, 41 const char *, 42 rpc_authflavor_t, 43 struct nfs_fh *); 44 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 45 struct nfs_fh *); 46 extern void nfs_free_server(struct nfs_server *server); 47 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 48 struct nfs_fh *, 49 struct nfs_fattr *); 50 #ifdef CONFIG_PROC_FS 51 extern int __init nfs_fs_proc_init(void); 52 extern void nfs_fs_proc_exit(void); 53 #else 54 static inline int nfs_fs_proc_init(void) 55 { 56 return 0; 57 } 58 static inline void nfs_fs_proc_exit(void) 59 { 60 } 61 #endif 62 63 /* nfs4namespace.c */ 64 #ifdef CONFIG_NFS_V4 65 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 66 #else 67 static inline 68 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 69 { 70 return ERR_PTR(-ENOENT); 71 } 72 #endif 73 74 /* callback_xdr.c */ 75 extern struct svc_version nfs4_callback_version1; 76 77 /* pagelist.c */ 78 extern int __init nfs_init_nfspagecache(void); 79 extern void nfs_destroy_nfspagecache(void); 80 extern int __init nfs_init_readpagecache(void); 81 extern void nfs_destroy_readpagecache(void); 82 extern int __init nfs_init_writepagecache(void); 83 extern void nfs_destroy_writepagecache(void); 84 85 #ifdef CONFIG_NFS_DIRECTIO 86 extern int __init nfs_init_directcache(void); 87 extern void nfs_destroy_directcache(void); 88 #else 89 #define nfs_init_directcache() (0) 90 #define nfs_destroy_directcache() do {} while(0) 91 #endif 92 93 /* nfs2xdr.c */ 94 extern int nfs_stat_to_errno(int); 95 extern struct rpc_procinfo nfs_procedures[]; 96 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); 97 98 /* nfs3xdr.c */ 99 extern struct rpc_procinfo nfs3_procedures[]; 100 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); 101 102 /* nfs4xdr.c */ 103 #ifdef CONFIG_NFS_V4 104 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); 105 #endif 106 107 /* nfs4proc.c */ 108 #ifdef CONFIG_NFS_V4 109 extern struct rpc_procinfo nfs4_procedures[]; 110 #endif 111 112 /* dir.c */ 113 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 114 115 /* inode.c */ 116 extern struct inode *nfs_alloc_inode(struct super_block *sb); 117 extern void nfs_destroy_inode(struct inode *); 118 extern int nfs_write_inode(struct inode *,int); 119 extern void nfs_clear_inode(struct inode *); 120 #ifdef CONFIG_NFS_V4 121 extern void nfs4_clear_inode(struct inode *); 122 #endif 123 124 /* super.c */ 125 extern struct file_system_type nfs_xdev_fs_type; 126 #ifdef CONFIG_NFS_V4 127 extern struct file_system_type nfs4_xdev_fs_type; 128 extern struct file_system_type nfs4_referral_fs_type; 129 #endif 130 131 extern struct rpc_stat nfs_rpcstat; 132 133 extern int __init register_nfs_fs(void); 134 extern void __exit unregister_nfs_fs(void); 135 136 /* namespace.c */ 137 extern char *nfs_path(const char *base, 138 const struct dentry *droot, 139 const struct dentry *dentry, 140 char *buffer, ssize_t buflen); 141 142 /* getroot.c */ 143 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 144 #ifdef CONFIG_NFS_V4 145 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 146 147 extern int nfs4_path_walk(struct nfs_server *server, 148 struct nfs_fh *mntfh, 149 const char *path); 150 #endif 151 152 /* 153 * Determine the device name as a string 154 */ 155 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 156 const struct dentry *dentry, 157 char *buffer, ssize_t buflen) 158 { 159 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 160 dentry, buffer, buflen); 161 } 162 163 /* 164 * Determine the actual block size (and log2 thereof) 165 */ 166 static inline 167 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 168 { 169 /* make sure blocksize is a power of two */ 170 if ((bsize & (bsize - 1)) || nrbitsp) { 171 unsigned char nrbits; 172 173 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 174 ; 175 bsize = 1 << nrbits; 176 if (nrbitsp) 177 *nrbitsp = nrbits; 178 } 179 180 return bsize; 181 } 182 183 /* 184 * Calculate the number of 512byte blocks used. 185 */ 186 static inline unsigned long nfs_calc_block_size(u64 tsize) 187 { 188 loff_t used = (tsize + 511) >> 9; 189 return (used > ULONG_MAX) ? ULONG_MAX : used; 190 } 191 192 /* 193 * Compute and set NFS server blocksize 194 */ 195 static inline 196 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 197 { 198 if (bsize < NFS_MIN_FILE_IO_SIZE) 199 bsize = NFS_DEF_FILE_IO_SIZE; 200 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 201 bsize = NFS_MAX_FILE_IO_SIZE; 202 203 return nfs_block_bits(bsize, nrbitsp); 204 } 205 206 /* 207 * Determine the maximum file size for a superblock 208 */ 209 static inline 210 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 211 { 212 sb->s_maxbytes = (loff_t)maxfilesize; 213 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 214 sb->s_maxbytes = MAX_LFS_FILESIZE; 215 } 216 217 /* 218 * Determine the number of bytes of data the page contains 219 */ 220 static inline 221 unsigned int nfs_page_length(struct page *page) 222 { 223 loff_t i_size = i_size_read(page->mapping->host); 224 225 if (i_size > 0) { 226 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 227 if (page->index < end_index) 228 return PAGE_CACHE_SIZE; 229 if (page->index == end_index) 230 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 231 } 232 return 0; 233 } 234 235 /* 236 * Determine the number of pages in an array of length 'len' and 237 * with a base offset of 'base' 238 */ 239 static inline 240 unsigned int nfs_page_array_len(unsigned int base, size_t len) 241 { 242 return ((unsigned long)len + (unsigned long)base + 243 PAGE_SIZE - 1) >> PAGE_SHIFT; 244 } 245 246