release/src-rt-6.x.4708/linux/linux-2.6.36/fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include "nfs4_fs.h"
   6 #include <linux/mount.h>
   7 #include <linux/security.h>
   8
   9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
  10
  11 struct nfs_string;
  12
  13 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  14
  15 /*
  16  * Determine if sessions are in use.
  17  */
  18 static inline int nfs4_has_session(const struct nfs_client *clp)
  19 {
  20 #ifdef CONFIG_NFS_V4_1
  21         if (clp->cl_session)
  22                 return 1;
  23 #endif /* CONFIG_NFS_V4_1 */
  24         return 0;
  25 }
  26
  27 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
  28 {
  29 #ifdef CONFIG_NFS_V4_1
  30         if (nfs4_has_session(clp))
  31                 return (clp->cl_session->flags & SESSION4_PERSIST);
  32 #endif /* CONFIG_NFS_V4_1 */
  33         return 0;
  34 }
  35
  36 struct nfs_clone_mount {
  37         const struct super_block *sb;
  38         const struct dentry *dentry;
  39         struct nfs_fh *fh;
  40         struct nfs_fattr *fattr;
  41         char *hostname;
  42         char *mnt_path;
  43         struct sockaddr *addr;
  44         size_t addrlen;
  45         rpc_authflavor_t authflavor;
  46 };
  47
  48 /*
  49  * Note: RFC 1813 doesn't limit the number of auth flavors that
  50  * a server can return, so make something up.
  51  */
  52 #define NFS_MAX_SECFLAVORS      (12)
  53
  54 /*
  55  * Value used if the user did not specify a port value.
  56  */
  57 #define NFS_UNSPEC_PORT         (-1)
  58
  59 /*
  60  * In-kernel mount arguments
  61  */
  62 struct nfs_parsed_mount_data {
  63         int                     flags;
  64         int                     rsize, wsize;
  65         int                     timeo, retrans;
  66         int                     acregmin, acregmax,
  67                                 acdirmin, acdirmax;
  68         int                     namlen;
  69         unsigned int            options;
  70         unsigned int            bsize;
  71         unsigned int            auth_flavor_len;
  72         rpc_authflavor_t        auth_flavors[1];
  73         char                    *client_address;
  74         unsigned int            version;
  75         unsigned int            minorversion;
  76         char                    *fscache_uniq;
  77
  78         struct {
  79                 struct sockaddr_storage address;
  80                 size_t                  addrlen;
  81                 char                    *hostname;
  82                 u32                     version;
  83                 int                     port;
  84                 unsigned short          protocol;
  85         } mount_server;
  86
  87         struct {
  88                 struct sockaddr_storage address;
  89                 size_t                  addrlen;
  90                 char                    *hostname;
  91                 char                    *export_path;
  92                 int                     port;
  93                 unsigned short          protocol;
  94         } nfs_server;
  95
  96         struct security_mnt_opts lsm_opts;
  97 };
  98
  99 /* mount_clnt.c */
 100 struct nfs_mount_request {
 101         struct sockaddr         *sap;
 102         size_t                  salen;
 103         char                    *hostname;
 104         char                    *dirpath;
 105         u32                     version;
 106         unsigned short          protocol;
 107         struct nfs_fh           *fh;
 108         int                     noresvport;
 109         unsigned int            *auth_flav_len;
 110         rpc_authflavor_t        *auth_flavs;
 111 };
 112
 113 extern int nfs_mount(struct nfs_mount_request *info);
 114 extern void nfs_umount(const struct nfs_mount_request *info);
 115
 116 /* client.c */
 117 extern struct rpc_program nfs_program;
 118
 119 extern void nfs_put_client(struct nfs_client *);
 120 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
 121 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
 122 extern struct nfs_server *nfs_create_server(
 123                                         const struct nfs_parsed_mount_data *,
 124                                         struct nfs_fh *);
 125 extern struct nfs_server *nfs4_create_server(
 126                                         const struct nfs_parsed_mount_data *,
 127                                         struct nfs_fh *);
 128 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 129                                                       struct nfs_fh *);
 130 extern void nfs_free_server(struct nfs_server *server);
 131 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 132                                            struct nfs_fh *,
 133                                            struct nfs_fattr *);
 134 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 135 extern int nfs4_check_client_ready(struct nfs_client *clp);
 136 #ifdef CONFIG_PROC_FS
 137 extern int __init nfs_fs_proc_init(void);
 138 extern void nfs_fs_proc_exit(void);
 139 #else
 140 static inline int nfs_fs_proc_init(void)
 141 {
 142         return 0;
 143 }
 144 static inline void nfs_fs_proc_exit(void)
 145 {
 146 }
 147 #endif
 148
 149 /* nfs4namespace.c */
 150 #ifdef CONFIG_NFS_V4
 151 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
 152 #else
 153 static inline
 154 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
 155 {
 156         return ERR_PTR(-ENOENT);
 157 }
 158 #endif
 159
 160 /* callback_xdr.c */
 161 extern struct svc_version nfs4_callback_version1;
 162 extern struct svc_version nfs4_callback_version4;
 163
 164 /* pagelist.c */
 165 extern int __init nfs_init_nfspagecache(void);
 166 extern void nfs_destroy_nfspagecache(void);
 167 extern int __init nfs_init_readpagecache(void);
 168 extern void nfs_destroy_readpagecache(void);
 169 extern int __init nfs_init_writepagecache(void);
 170 extern void nfs_destroy_writepagecache(void);
 171
 172 extern int __init nfs_init_directcache(void);
 173 extern void nfs_destroy_directcache(void);
 174
 175 /* nfs2xdr.c */
 176 extern int nfs_stat_to_errno(int);
 177 extern struct rpc_procinfo nfs_procedures[];
 178 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
 179
 180 /* nfs3xdr.c */
 181 extern struct rpc_procinfo nfs3_procedures[];
 182 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
 183
 184 /* nfs4xdr.c */
 185 #ifdef CONFIG_NFS_V4
 186 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 187 #endif
 188 #ifdef CONFIG_NFS_V4_1
 189 extern const u32 nfs41_maxread_overhead;
 190 extern const u32 nfs41_maxwrite_overhead;
 191 #endif
 192
 193 /* nfs4proc.c */
 194 #ifdef CONFIG_NFS_V4
 195 extern struct rpc_procinfo nfs4_procedures[];
 196 #endif
 197
 198 /* proc.c */
 199 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 200
 201 /* dir.c */
 202 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 203                                         int nr_to_scan, gfp_t gfp_mask);
 204
 205 /* inode.c */
 206 extern struct workqueue_struct *nfsiod_workqueue;
 207 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 208 extern void nfs_destroy_inode(struct inode *);
 209 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 210 extern void nfs_evict_inode(struct inode *);
 211 #ifdef CONFIG_NFS_V4
 212 extern void nfs4_evict_inode(struct inode *);
 213 #endif
 214 void nfs_zap_acl_cache(struct inode *inode);
 215 extern int nfs_wait_bit_killable(void *word);
 216
 217 /* super.c */
 218 extern struct file_system_type nfs_xdev_fs_type;
 219 #ifdef CONFIG_NFS_V4
 220 extern struct file_system_type nfs4_xdev_fs_type;
 221 extern struct file_system_type nfs4_referral_fs_type;
 222 #endif
 223
 224 extern struct rpc_stat nfs_rpcstat;
 225
 226 extern int __init register_nfs_fs(void);
 227 extern void __exit unregister_nfs_fs(void);
 228 extern void nfs_sb_active(struct super_block *sb);
 229 extern void nfs_sb_deactive(struct super_block *sb);
 230
 231 /* namespace.c */
 232 extern char *nfs_path(const char *base,
 233                       const struct dentry *droot,
 234                       const struct dentry *dentry,
 235                       char *buffer, ssize_t buflen);
 236
 237 /* getroot.c */
 238 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 239 #ifdef CONFIG_NFS_V4
 240 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 241
 242 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 243 #endif
 244
 245 /* read.c */
 246 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 247
 248 /* write.c */
 249 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 250 #ifdef CONFIG_MIGRATION
 251 extern int nfs_migrate_page(struct address_space *,
 252                 struct page *, struct page *);
 253 #else
 254 #define nfs_migrate_page NULL
 255 #endif
 256
 257 /* nfs4proc.c */
 258 extern int _nfs4_call_sync(struct nfs_server *server,
 259                            struct rpc_message *msg,
 260                            struct nfs4_sequence_args *args,
 261                            struct nfs4_sequence_res *res,
 262                            int cache_reply);
 263 extern int _nfs4_call_sync_session(struct nfs_server *server,
 264                                    struct rpc_message *msg,
 265                                    struct nfs4_sequence_args *args,
 266                                    struct nfs4_sequence_res *res,
 267                                    int cache_reply);
 268
 269 /*
 270  * Determine the device name as a string
 271  */
 272 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 273                                 const struct dentry *dentry,
 274                                 char *buffer, ssize_t buflen)
 275 {
 276         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 277                         dentry, buffer, buflen);
 278 }
 279
 280 /*
 281  * Determine the actual block size (and log2 thereof)
 282  */
 283 static inline
 284 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 285 {
 286         /* make sure blocksize is a power of two */
 287         if ((bsize & (bsize - 1)) || nrbitsp) {
 288                 unsigned char   nrbits;
 289
 290                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 291                         ;
 292                 bsize = 1 << nrbits;
 293                 if (nrbitsp)
 294                         *nrbitsp = nrbits;
 295         }
 296
 297         return bsize;
 298 }
 299
 300 /*
 301  * Calculate the number of 512byte blocks used.
 302  */
 303 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 304 {
 305         blkcnt_t used = (tsize + 511) >> 9;
 306         return (used > ULONG_MAX) ? ULONG_MAX : used;
 307 }
 308
 309 /*
 310  * Compute and set NFS server blocksize
 311  */
 312 static inline
 313 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 314 {
 315         if (bsize < NFS_MIN_FILE_IO_SIZE)
 316                 bsize = NFS_DEF_FILE_IO_SIZE;
 317         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 318                 bsize = NFS_MAX_FILE_IO_SIZE;
 319
 320         return nfs_block_bits(bsize, nrbitsp);
 321 }
 322
 323 /*
 324  * Determine the maximum file size for a superblock
 325  */
 326 static inline
 327 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 328 {
 329         sb->s_maxbytes = (loff_t)maxfilesize;
 330         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 331                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 332 }
 333
 334 /*
 335  * Determine the number of bytes of data the page contains
 336  */
 337 static inline
 338 unsigned int nfs_page_length(struct page *page)
 339 {
 340         loff_t i_size = i_size_read(page->mapping->host);
 341
 342         if (i_size > 0) {
 343                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 344                 if (page->index < end_index)
 345                         return PAGE_CACHE_SIZE;
 346                 if (page->index == end_index)
 347                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 348         }
 349         return 0;
 350 }
 351
 352 /*
 353  * Determine the number of pages in an array of length 'len' and
 354  * with a base offset of 'base'
 355  */
 356 static inline
 357 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 358 {
 359         return ((unsigned long)len + (unsigned long)base +
 360                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 361 }
 362
 363 /*
 364  * Helper for restarting RPC calls in the possible presence of NFSv4.1
 365  * sessions.
 366  */
 367 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
 368 {
 369         if (nfs4_has_session(clp))
 370                 return rpc_restart_call_prepare(task);
 371         return rpc_restart_call(task);
 372 }