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 /* Maximum number of readahead requests
  14  * FIXME: this should really be a sysctl so that users may tune it to suit
  15  *        their needs. People that do NFS over a slow network, might for
  16  *        instance want to reduce it to something closer to 1 for improved
  17  *        interactive response.
  18  */
  19 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  20
  21 /*
  22  * Determine if sessions are in use.
  23  */
  24 static inline int nfs4_has_session(const struct nfs_client *clp)
  25 {
  26 #ifdef CONFIG_NFS_V4_1
  27         if (clp->cl_session)
  28                 return 1;
  29 #endif /* CONFIG_NFS_V4_1 */
  30         return 0;
  31 }
  32
  33 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
  34 {
  35 #ifdef CONFIG_NFS_V4_1
  36         if (nfs4_has_session(clp))
  37                 return (clp->cl_session->flags & SESSION4_PERSIST);
  38 #endif /* CONFIG_NFS_V4_1 */
  39         return 0;
  40 }
  41
  42 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
  43 {
  44         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
  45                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
  46 }
  47
  48 struct nfs_clone_mount {
  49         const struct super_block *sb;
  50         const struct dentry *dentry;
  51         struct nfs_fh *fh;
  52         struct nfs_fattr *fattr;
  53         char *hostname;
  54         char *mnt_path;
  55         struct sockaddr *addr;
  56         size_t addrlen;
  57         rpc_authflavor_t authflavor;
  58 };
  59
  60 /*
  61  * Note: RFC 1813 doesn't limit the number of auth flavors that
  62  * a server can return, so make something up.
  63  */
  64 #define NFS_MAX_SECFLAVORS      (12)
  65
  66 /*
  67  * Value used if the user did not specify a port value.
  68  */
  69 #define NFS_UNSPEC_PORT         (-1)
  70
  71 /*
  72  * Maximum number of pages that readdir can use for creating
  73  * a vmapped array of pages.
  74  */
  75 #define NFS_MAX_READDIR_PAGES 8
  76
  77 /*
  78  * In-kernel mount arguments
  79  */
  80 struct nfs_parsed_mount_data {
  81         int                     flags;
  82         int                     rsize, wsize;
  83         int                     timeo, retrans;
  84         int                     acregmin, acregmax,
  85                                 acdirmin, acdirmax;
  86         int                     namlen;
  87         unsigned int            options;
  88         unsigned int            bsize;
  89         unsigned int            auth_flavor_len;
  90         rpc_authflavor_t        auth_flavors[1];
  91         char                    *client_address;
  92         unsigned int            version;
  93         unsigned int            minorversion;
  94         char                    *fscache_uniq;
  95
  96         struct {
  97                 struct sockaddr_storage address;
  98                 size_t                  addrlen;
  99                 char                    *hostname;
 100                 u32                     version;
 101                 int                     port;
 102                 unsigned short          protocol;
 103         } mount_server;
 104
 105         struct {
 106                 struct sockaddr_storage address;
 107                 size_t                  addrlen;
 108                 char                    *hostname;
 109                 char                    *export_path;
 110                 int                     port;
 111                 unsigned short          protocol;
 112         } nfs_server;
 113
 114         struct security_mnt_opts lsm_opts;
 115 };
 116
 117 /* mount_clnt.c */
 118 struct nfs_mount_request {
 119         struct sockaddr         *sap;
 120         size_t                  salen;
 121         char                    *hostname;
 122         char                    *dirpath;
 123         u32                     version;
 124         unsigned short          protocol;
 125         struct nfs_fh           *fh;
 126         int                     noresvport;
 127         unsigned int            *auth_flav_len;
 128         rpc_authflavor_t        *auth_flavs;
 129 };
 130
 131 extern int nfs_mount(struct nfs_mount_request *info);
 132 extern void nfs_umount(const struct nfs_mount_request *info);
 133
 134 /* client.c */
 135 extern struct rpc_program nfs_program;
 136
 137 extern void nfs_cleanup_cb_ident_idr(void);
 138 extern void nfs_put_client(struct nfs_client *);
 139 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
 140 extern struct nfs_client *nfs4_find_client_ident(int);
 141 extern struct nfs_client *
 142 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
 143 extern struct nfs_server *nfs_create_server(
 144                                         const struct nfs_parsed_mount_data *,
 145                                         struct nfs_fh *);
 146 extern struct nfs_server *nfs4_create_server(
 147                                         const struct nfs_parsed_mount_data *,
 148                                         struct nfs_fh *);
 149 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 150                                                       struct nfs_fh *);
 151 extern void nfs_free_server(struct nfs_server *server);
 152 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 153                                            struct nfs_fh *,
 154                                            struct nfs_fattr *);
 155 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 156 extern int nfs4_check_client_ready(struct nfs_client *clp);
 157 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 158                                              const struct sockaddr *ds_addr,
 159                                              int ds_addrlen, int ds_proto);
 160 #ifdef CONFIG_PROC_FS
 161 extern int __init nfs_fs_proc_init(void);
 162 extern void nfs_fs_proc_exit(void);
 163 #else
 164 static inline int nfs_fs_proc_init(void)
 165 {
 166         return 0;
 167 }
 168 static inline void nfs_fs_proc_exit(void)
 169 {
 170 }
 171 #endif
 172
 173 /* nfs4namespace.c */
 174 #ifdef CONFIG_NFS_V4
 175 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
 176 #else
 177 static inline
 178 struct vfsmount *nfs_do_refmount(struct dentry *dentry)
 179 {
 180         return ERR_PTR(-ENOENT);
 181 }
 182 #endif
 183
 184 /* callback_xdr.c */
 185 extern struct svc_version nfs4_callback_version1;
 186 extern struct svc_version nfs4_callback_version4;
 187
 188 /* pagelist.c */
 189 extern int __init nfs_init_nfspagecache(void);
 190 extern void nfs_destroy_nfspagecache(void);
 191 extern int __init nfs_init_readpagecache(void);
 192 extern void nfs_destroy_readpagecache(void);
 193 extern int __init nfs_init_writepagecache(void);
 194 extern void nfs_destroy_writepagecache(void);
 195
 196 extern int __init nfs_init_directcache(void);
 197 extern void nfs_destroy_directcache(void);
 198
 199 /* nfs2xdr.c */
 200 extern int nfs_stat_to_errno(enum nfs_stat);
 201 extern struct rpc_procinfo nfs_procedures[];
 202 extern int nfs2_decode_dirent(struct xdr_stream *,
 203                                 struct nfs_entry *, int);
 204
 205 /* nfs3xdr.c */
 206 extern struct rpc_procinfo nfs3_procedures[];
 207 extern int nfs3_decode_dirent(struct xdr_stream *,
 208                                 struct nfs_entry *, int);
 209
 210 /* nfs4xdr.c */
 211 #ifdef CONFIG_NFS_V4
 212 extern int nfs4_decode_dirent(struct xdr_stream *,
 213                                 struct nfs_entry *, int);
 214 #endif
 215 #ifdef CONFIG_NFS_V4_1
 216 extern const u32 nfs41_maxread_overhead;
 217 extern const u32 nfs41_maxwrite_overhead;
 218 #endif
 219
 220 /* nfs4proc.c */
 221 #ifdef CONFIG_NFS_V4
 222 extern struct rpc_procinfo nfs4_procedures[];
 223 void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
 224 #endif
 225
 226 extern int nfs4_init_ds_session(struct nfs_client *clp);
 227
 228 /* proc.c */
 229 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 230 extern int nfs_init_client(struct nfs_client *clp,
 231                            const struct rpc_timeout *timeparms,
 232                            const char *ip_addr, rpc_authflavor_t authflavour,
 233                            int noresvport);
 234
 235 /* dir.c */
 236 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 237                                         int nr_to_scan, gfp_t gfp_mask);
 238
 239 /* inode.c */
 240 extern struct workqueue_struct *nfsiod_workqueue;
 241 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 242 extern void nfs_destroy_inode(struct inode *);
 243 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 244 extern void nfs_evict_inode(struct inode *);
 245 #ifdef CONFIG_NFS_V4
 246 extern void nfs4_evict_inode(struct inode *);
 247 #endif
 248 void nfs_zap_acl_cache(struct inode *inode);
 249 extern int nfs_wait_bit_killable(void *word);
 250
 251 /* super.c */
 252 extern struct file_system_type nfs_xdev_fs_type;
 253 #ifdef CONFIG_NFS_V4
 254 extern struct file_system_type nfs4_xdev_fs_type;
 255 extern struct file_system_type nfs4_referral_fs_type;
 256 #endif
 257
 258 extern struct rpc_stat nfs_rpcstat;
 259
 260 extern int __init register_nfs_fs(void);
 261 extern void __exit unregister_nfs_fs(void);
 262 extern void nfs_sb_active(struct super_block *sb);
 263 extern void nfs_sb_deactive(struct super_block *sb);
 264
 265 /* namespace.c */
 266 extern char *nfs_path(char **p, struct dentry *dentry,
 267                       char *buffer, ssize_t buflen);
 268 extern struct vfsmount *nfs_d_automount(struct path *path);
 269
 270 /* getroot.c */
 271 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 272                                    const char *);
 273 #ifdef CONFIG_NFS_V4
 274 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 275                                     const char *);
 276
 277 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 278 #endif
 279
 280 /* read.c */
 281 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
 282                              const struct rpc_call_ops *call_ops);
 283 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 284
 285 /* write.c */
 286 extern void nfs_commit_free(struct nfs_write_data *p);
 287 extern int nfs_initiate_write(struct nfs_write_data *data,
 288                               struct rpc_clnt *clnt,
 289                               const struct rpc_call_ops *call_ops,
 290                               int how);
 291 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 292 extern int nfs_initiate_commit(struct nfs_write_data *data,
 293                                struct rpc_clnt *clnt,
 294                                const struct rpc_call_ops *call_ops,
 295                                int how);
 296 extern void nfs_init_commit(struct nfs_write_data *data,
 297                             struct list_head *head,
 298                             struct pnfs_layout_segment *lseg);
 299 void nfs_retry_commit(struct list_head *page_list,
 300                       struct pnfs_layout_segment *lseg);
 301 void nfs_commit_clear_lock(struct nfs_inode *nfsi);
 302 void nfs_commitdata_release(void *data);
 303 void nfs_commit_release_pages(struct nfs_write_data *data);
 304
 305 #ifdef CONFIG_MIGRATION
 306 extern int nfs_migrate_page(struct address_space *,
 307                 struct page *, struct page *);
 308 #else
 309 #define nfs_migrate_page NULL
 310 #endif
 311
 312 /* nfs4proc.c */
 313 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
 314 extern int nfs4_init_client(struct nfs_client *clp,
 315                             const struct rpc_timeout *timeparms,
 316                             const char *ip_addr,
 317                             rpc_authflavor_t authflavour,
 318                             int noresvport);
 319 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
 320 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
 321                            struct nfs_server *server,
 322                            struct rpc_message *msg,
 323                            struct nfs4_sequence_args *args,
 324                            struct nfs4_sequence_res *res,
 325                            int cache_reply);
 326 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 327                                    struct nfs_server *server,
 328                                    struct rpc_message *msg,
 329                                    struct nfs4_sequence_args *args,
 330                                    struct nfs4_sequence_res *res,
 331                                    int cache_reply);
 332
 333 /*
 334  * Determine the device name as a string
 335  */
 336 static inline char *nfs_devname(struct dentry *dentry,
 337                                 char *buffer, ssize_t buflen)
 338 {
 339         char *dummy;
 340         return nfs_path(&dummy, dentry, buffer, buflen);
 341 }
 342
 343 /*
 344  * Determine the actual block size (and log2 thereof)
 345  */
 346 static inline
 347 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 348 {
 349         /* make sure blocksize is a power of two */
 350         if ((bsize & (bsize - 1)) || nrbitsp) {
 351                 unsigned char   nrbits;
 352
 353                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 354                         ;
 355                 bsize = 1 << nrbits;
 356                 if (nrbitsp)
 357                         *nrbitsp = nrbits;
 358         }
 359
 360         return bsize;
 361 }
 362
 363 /*
 364  * Calculate the number of 512byte blocks used.
 365  */
 366 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 367 {
 368         blkcnt_t used = (tsize + 511) >> 9;
 369         return (used > ULONG_MAX) ? ULONG_MAX : used;
 370 }
 371
 372 /*
 373  * Compute and set NFS server blocksize
 374  */
 375 static inline
 376 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 377 {
 378         if (bsize < NFS_MIN_FILE_IO_SIZE)
 379                 bsize = NFS_DEF_FILE_IO_SIZE;
 380         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 381                 bsize = NFS_MAX_FILE_IO_SIZE;
 382
 383         return nfs_block_bits(bsize, nrbitsp);
 384 }
 385
 386 /*
 387  * Determine the maximum file size for a superblock
 388  */
 389 static inline
 390 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 391 {
 392         sb->s_maxbytes = (loff_t)maxfilesize;
 393         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 394                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 395 }
 396
 397 /*
 398  * Determine the number of bytes of data the page contains
 399  */
 400 static inline
 401 unsigned int nfs_page_length(struct page *page)
 402 {
 403         loff_t i_size = i_size_read(page->mapping->host);
 404
 405         if (i_size > 0) {
 406                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 407                 if (page->index < end_index)
 408                         return PAGE_CACHE_SIZE;
 409                 if (page->index == end_index)
 410                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 411         }
 412         return 0;
 413 }
 414
 415 /*
 416  * Convert a umode to a dirent->d_type
 417  */
 418 static inline
 419 unsigned char nfs_umode_to_dtype(umode_t mode)
 420 {
 421         return (mode >> 12) & 15;
 422 }
 423
 424 /*
 425  * Determine the number of pages in an array of length 'len' and
 426  * with a base offset of 'base'
 427  */
 428 static inline
 429 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 430 {
 431         return ((unsigned long)len + (unsigned long)base +
 432                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 433 }
 434
 435 /*
 436  * Helper for restarting RPC calls in the possible presence of NFSv4.1
 437  * sessions.
 438  */
 439 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
 440 {
 441         if (nfs4_has_session(clp))
 442                 return rpc_restart_call_prepare(task);
 443         return rpc_restart_call(task);
 444 }