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[]; 110 111 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry, 112 struct nfs4_fs_locations *fs_locations, 113 struct page *page); 114 #endif 115 116 /* dir.c */ 117 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 118 119 /* inode.c */ 120 extern struct inode *nfs_alloc_inode(struct super_block *sb); 121 extern void nfs_destroy_inode(struct inode *); 122 extern int nfs_write_inode(struct inode *,int); 123 extern void nfs_clear_inode(struct inode *); 124 #ifdef CONFIG_NFS_V4 125 extern void nfs4_clear_inode(struct inode *); 126 #endif 127 128 /* super.c */ 129 extern struct file_system_type nfs_xdev_fs_type; 130 #ifdef CONFIG_NFS_V4 131 extern struct file_system_type nfs4_xdev_fs_type; 132 extern struct file_system_type nfs4_referral_fs_type; 133 #endif 134 135 extern struct rpc_stat nfs_rpcstat; 136 137 extern int __init register_nfs_fs(void); 138 extern void __exit unregister_nfs_fs(void); 139 140 /* namespace.c */ 141 extern char *nfs_path(const char *base, 142 const struct dentry *droot, 143 const struct dentry *dentry, 144 char *buffer, ssize_t buflen); 145 146 /* getroot.c */ 147 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 148 #ifdef CONFIG_NFS_V4 149 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 150 151 extern int nfs4_path_walk(struct nfs_server *server, 152 struct nfs_fh *mntfh, 153 const char *path); 154 #endif 155 156 /* 157 * Determine the device name as a string 158 */ 159 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 160 const struct dentry *dentry, 161 char *buffer, ssize_t buflen) 162 { 163 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 164 dentry, buffer, buflen); 165 } 166 167 /* 168 * Determine the actual block size (and log2 thereof) 169 */ 170 static inline 171 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 172 { 173 /* make sure blocksize is a power of two */ 174 if ((bsize & (bsize - 1)) || nrbitsp) { 175 unsigned char nrbits; 176 177 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 178 ; 179 bsize = 1 << nrbits; 180 if (nrbitsp) 181 *nrbitsp = nrbits; 182 } 183 184 return bsize; 185 } 186 187 /* 188 * Calculate the number of 512byte blocks used. 189 */ 190 static inline unsigned long nfs_calc_block_size(u64 tsize) 191 { 192 loff_t used = (tsize + 511) >> 9; 193 return (used > ULONG_MAX) ? ULONG_MAX : used; 194 } 195 196 /* 197 * Compute and set NFS server blocksize 198 */ 199 static inline 200 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 201 { 202 if (bsize < NFS_MIN_FILE_IO_SIZE) 203 bsize = NFS_DEF_FILE_IO_SIZE; 204 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 205 bsize = NFS_MAX_FILE_IO_SIZE; 206 207 return nfs_block_bits(bsize, nrbitsp); 208 } 209 210 /* 211 * Determine the maximum file size for a superblock 212 */ 213 static inline 214 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 215 { 216 sb->s_maxbytes = (loff_t)maxfilesize; 217 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 218 sb->s_maxbytes = MAX_LFS_FILESIZE; 219 } 220 221 /* 222 * Determine the number of bytes of data the page contains 223 */ 224 static inline 225 unsigned int nfs_page_length(struct page *page) 226 { 227 loff_t i_size = i_size_read(page->mapping->host); 228 229 if (i_size > 0) { 230 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 231 if (page->index < end_index) 232 return PAGE_CACHE_SIZE; 233 if (page->index == end_index) 234 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 235 } 236 return 0; 237 } 238