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 51 /* nfs4namespace.c */ 52 #ifdef CONFIG_NFS_V4 53 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); 54 #else 55 static inline 56 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) 57 { 58 return ERR_PTR(-ENOENT); 59 } 60 #endif 61 62 /* callback_xdr.c */ 63 extern struct svc_version nfs4_callback_version1; 64 65 /* pagelist.c */ 66 extern int __init nfs_init_nfspagecache(void); 67 extern void nfs_destroy_nfspagecache(void); 68 extern int __init nfs_init_readpagecache(void); 69 extern void nfs_destroy_readpagecache(void); 70 extern int __init nfs_init_writepagecache(void); 71 extern void nfs_destroy_writepagecache(void); 72 73 #ifdef CONFIG_NFS_DIRECTIO 74 extern int __init nfs_init_directcache(void); 75 extern void nfs_destroy_directcache(void); 76 #else 77 #define nfs_init_directcache() (0) 78 #define nfs_destroy_directcache() do {} while(0) 79 #endif 80 81 /* nfs2xdr.c */ 82 extern int nfs_stat_to_errno(int); 83 extern struct rpc_procinfo nfs_procedures[]; 84 extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int); 85 86 /* nfs3xdr.c */ 87 extern struct rpc_procinfo nfs3_procedures[]; 88 extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int); 89 90 /* nfs4xdr.c */ 91 #ifdef CONFIG_NFS_V4 92 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus); 93 #endif 94 95 /* nfs4proc.c */ 96 #ifdef CONFIG_NFS_V4 97 extern struct rpc_procinfo nfs4_procedures[]; 98 99 extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry, 100 struct nfs4_fs_locations *fs_locations, 101 struct page *page); 102 #endif 103 104 /* dir.c */ 105 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); 106 107 /* inode.c */ 108 extern struct inode *nfs_alloc_inode(struct super_block *sb); 109 extern void nfs_destroy_inode(struct inode *); 110 extern int nfs_write_inode(struct inode *,int); 111 extern void nfs_clear_inode(struct inode *); 112 #ifdef CONFIG_NFS_V4 113 extern void nfs4_clear_inode(struct inode *); 114 #endif 115 116 /* super.c */ 117 extern struct file_system_type nfs_xdev_fs_type; 118 #ifdef CONFIG_NFS_V4 119 extern struct file_system_type nfs4_xdev_fs_type; 120 extern struct file_system_type nfs4_referral_fs_type; 121 #endif 122 123 extern struct rpc_stat nfs_rpcstat; 124 125 extern int __init register_nfs_fs(void); 126 extern void __exit unregister_nfs_fs(void); 127 128 /* namespace.c */ 129 extern char *nfs_path(const char *base, 130 const struct dentry *droot, 131 const struct dentry *dentry, 132 char *buffer, ssize_t buflen); 133 134 /* getroot.c */ 135 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); 136 #ifdef CONFIG_NFS_V4 137 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); 138 139 extern int nfs4_path_walk(struct nfs_server *server, 140 struct nfs_fh *mntfh, 141 const char *path); 142 #endif 143 144 /* 145 * Determine the device name as a string 146 */ 147 static inline char *nfs_devname(const struct vfsmount *mnt_parent, 148 const struct dentry *dentry, 149 char *buffer, ssize_t buflen) 150 { 151 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, 152 dentry, buffer, buflen); 153 } 154 155 /* 156 * Determine the actual block size (and log2 thereof) 157 */ 158 static inline 159 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 160 { 161 /* make sure blocksize is a power of two */ 162 if ((bsize & (bsize - 1)) || nrbitsp) { 163 unsigned char nrbits; 164 165 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 166 ; 167 bsize = 1 << nrbits; 168 if (nrbitsp) 169 *nrbitsp = nrbits; 170 } 171 172 return bsize; 173 } 174 175 /* 176 * Calculate the number of 512byte blocks used. 177 */ 178 static inline unsigned long nfs_calc_block_size(u64 tsize) 179 { 180 loff_t used = (tsize + 511) >> 9; 181 return (used > ULONG_MAX) ? ULONG_MAX : used; 182 } 183 184 /* 185 * Compute and set NFS server blocksize 186 */ 187 static inline 188 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 189 { 190 if (bsize < NFS_MIN_FILE_IO_SIZE) 191 bsize = NFS_DEF_FILE_IO_SIZE; 192 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 193 bsize = NFS_MAX_FILE_IO_SIZE; 194 195 return nfs_block_bits(bsize, nrbitsp); 196 } 197 198 /* 199 * Determine the maximum file size for a superblock 200 */ 201 static inline 202 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 203 { 204 sb->s_maxbytes = (loff_t)maxfilesize; 205 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 206 sb->s_maxbytes = MAX_LFS_FILESIZE; 207 } 208