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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 | /* * NFS internal definitions */ #include <linux/mount.h> #include <linux/security.h> struct nfs_string; /* Maximum number of readahead requests * FIXME: this should really be a sysctl so that users may tune it to suit * their needs. People that do NFS over a slow network, might for * instance want to reduce it to something closer to 1 for improved * interactive response. */ #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) struct nfs_clone_mount { const struct super_block *sb; const struct dentry *dentry; struct nfs_fh *fh; struct nfs_fattr *fattr; char *hostname; char *mnt_path; struct sockaddr *addr; size_t addrlen; rpc_authflavor_t authflavor; }; /* * In-kernel mount arguments */ struct nfs_parsed_mount_data { int flags; int rsize, wsize; int timeo, retrans; int acregmin, acregmax, acdirmin, acdirmax; int namlen; unsigned int bsize; unsigned int auth_flavor_len; rpc_authflavor_t auth_flavors[1]; char *client_address; struct { struct sockaddr_storage address; size_t addrlen; char *hostname; u32 version; unsigned short port; unsigned short protocol; } mount_server; struct { struct sockaddr_storage address; size_t addrlen; char *hostname; char *export_path; unsigned short port; unsigned short protocol; } nfs_server; struct security_mnt_opts lsm_opts; }; /* client.c */ extern struct rpc_program nfs_program; extern void nfs_put_client(struct nfs_client *); extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32); extern struct nfs_client *nfs_find_client_next(struct nfs_client *); extern struct nfs_server *nfs_create_server( const struct nfs_parsed_mount_data *, struct nfs_fh *); extern struct nfs_server *nfs4_create_server( const struct nfs_parsed_mount_data *, struct nfs_fh *); extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, struct nfs_fh *); extern void nfs_free_server(struct nfs_server *server); extern struct nfs_server *nfs_clone_server(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *); #ifdef CONFIG_PROC_FS extern int __init nfs_fs_proc_init(void); extern void nfs_fs_proc_exit(void); #else static inline int nfs_fs_proc_init(void) { return 0; } static inline void nfs_fs_proc_exit(void) { } #endif /* nfs4namespace.c */ #ifdef CONFIG_NFS_V4 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry); #else static inline struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry) { return ERR_PTR(-ENOENT); } #endif /* callback_xdr.c */ extern struct svc_version nfs4_callback_version1; /* pagelist.c */ extern int __init nfs_init_nfspagecache(void); extern void nfs_destroy_nfspagecache(void); extern int __init nfs_init_readpagecache(void); extern void nfs_destroy_readpagecache(void); extern int __init nfs_init_writepagecache(void); extern void nfs_destroy_writepagecache(void); extern int __init nfs_init_directcache(void); extern void nfs_destroy_directcache(void); /* nfs2xdr.c */ extern int nfs_stat_to_errno(int); extern struct rpc_procinfo nfs_procedures[]; extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int); /* nfs3xdr.c */ extern struct rpc_procinfo nfs3_procedures[]; extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int); /* nfs4xdr.c */ #ifdef CONFIG_NFS_V4 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus); #endif /* nfs4proc.c */ #ifdef CONFIG_NFS_V4 extern struct rpc_procinfo nfs4_procedures[]; #endif /* dir.c */ extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask); /* inode.c */ extern struct workqueue_struct *nfsiod_workqueue; extern struct inode *nfs_alloc_inode(struct super_block *sb); extern void nfs_destroy_inode(struct inode *); extern int nfs_write_inode(struct inode *,int); extern void nfs_clear_inode(struct inode *); #ifdef CONFIG_NFS_V4 extern void nfs4_clear_inode(struct inode *); #endif /* super.c */ extern struct file_system_type nfs_xdev_fs_type; #ifdef CONFIG_NFS_V4 extern struct file_system_type nfs4_xdev_fs_type; extern struct file_system_type nfs4_referral_fs_type; #endif extern struct rpc_stat nfs_rpcstat; extern int __init register_nfs_fs(void); extern void __exit unregister_nfs_fs(void); extern void nfs_sb_active(struct nfs_server *server); extern void nfs_sb_deactive(struct nfs_server *server); /* namespace.c */ extern char *nfs_path(const char *base, const struct dentry *droot, const struct dentry *dentry, char *buffer, ssize_t buflen); /* getroot.c */ extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *); #ifdef CONFIG_NFS_V4 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *); extern int nfs4_path_walk(struct nfs_server *server, struct nfs_fh *mntfh, const char *path); #endif /* * Determine the device name as a string */ static inline char *nfs_devname(const struct vfsmount *mnt_parent, const struct dentry *dentry, char *buffer, ssize_t buflen) { return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root, dentry, buffer, buflen); } /* * Determine the actual block size (and log2 thereof) */ static inline unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) { /* make sure blocksize is a power of two */ if ((bsize & (bsize - 1)) || nrbitsp) { unsigned char nrbits; for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) ; bsize = 1 << nrbits; if (nrbitsp) *nrbitsp = nrbits; } return bsize; } /* * Calculate the number of 512byte blocks used. */ static inline blkcnt_t nfs_calc_block_size(u64 tsize) { blkcnt_t used = (tsize + 511) >> 9; return (used > ULONG_MAX) ? ULONG_MAX : used; } /* * Compute and set NFS server blocksize */ static inline unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) { if (bsize < NFS_MIN_FILE_IO_SIZE) bsize = NFS_DEF_FILE_IO_SIZE; else if (bsize >= NFS_MAX_FILE_IO_SIZE) bsize = NFS_MAX_FILE_IO_SIZE; return nfs_block_bits(bsize, nrbitsp); } /* * Determine the maximum file size for a superblock */ static inline void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) { sb->s_maxbytes = (loff_t)maxfilesize; if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) sb->s_maxbytes = MAX_LFS_FILESIZE; } /* * Determine the number of bytes of data the page contains */ static inline unsigned int nfs_page_length(struct page *page) { loff_t i_size = i_size_read(page->mapping->host); if (i_size > 0) { pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; if (page->index < end_index) return PAGE_CACHE_SIZE; if (page->index == end_index) return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; } return 0; } /* * Determine the number of pages in an array of length 'len' and * with a base offset of 'base' */ static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) { return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> PAGE_SHIFT; } |