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 #include <linux/crc32.h>
   9 #include <linux/nfs_page.h>
  10
  11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
  12
  13 struct nfs_string;
  14
  15 /* Maximum number of readahead requests
  16  * FIXME: this should really be a sysctl so that users may tune it to suit
  17  *        their needs. People that do NFS over a slow network, might for
  18  *        instance want to reduce it to something closer to 1 for improved
  19  *        interactive response.
  20  */
  21 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  22
  23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
  24 {
  25         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
  26                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
  27 }
  28
  29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
  30 {
  31         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
  32             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
  33              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
  34                 return 0;
  35         return 1;
  36 }
  37
  38 struct nfs_clone_mount {
  39         const struct super_block *sb;
  40         const struct dentry *dentry;
  41         struct nfs_fh *fh;
  42         struct nfs_fattr *fattr;
  43         char *hostname;
  44         char *mnt_path;
  45         struct sockaddr *addr;
  46         size_t addrlen;
  47         rpc_authflavor_t authflavor;
  48 };
  49
  50 /*
  51  * Note: RFC 1813 doesn't limit the number of auth flavors that
  52  * a server can return, so make something up.
  53  */
  54 #define NFS_MAX_SECFLAVORS      (12)
  55
  56 /*
  57  * Value used if the user did not specify a port value.
  58  */
  59 #define NFS_UNSPEC_PORT         (-1)
  60
  61 /*
  62  * Maximum number of pages that readdir can use for creating
  63  * a vmapped array of pages.
  64  */
  65 #define NFS_MAX_READDIR_PAGES 8
  66
  67 struct nfs_client_initdata {
  68         unsigned long init_flags;
  69         const char *hostname;                   /* Hostname of the server */
  70         const struct sockaddr *addr;            /* Address of the server */
  71         const char *nodename;                   /* Hostname of the client */
  72         const char *ip_addr;                    /* IP address of the client */
  73         size_t addrlen;
  74         struct nfs_subversion *nfs_mod;
  75         int proto;
  76         u32 minorversion;
  77         struct net *net;
  78         const struct rpc_timeout *timeparms;
  79 };
  80
  81 /*
  82  * In-kernel mount arguments
  83  */
  84 struct nfs_parsed_mount_data {
  85         int                     flags;
  86         unsigned int            rsize, wsize;
  87         unsigned int            timeo, retrans;
  88         unsigned int            acregmin, acregmax,
  89                                 acdirmin, acdirmax;
  90         unsigned int            namlen;
  91         unsigned int            options;
  92         unsigned int            bsize;
  93         struct nfs_auth_info    auth_info;
  94         rpc_authflavor_t        selected_flavor;
  95         char                    *client_address;
  96         unsigned int            version;
  97         unsigned int            minorversion;
  98         char                    *fscache_uniq;
  99         bool                    need_mount;
 100
 101         struct {
 102                 struct sockaddr_storage address;
 103                 size_t                  addrlen;
 104                 char                    *hostname;
 105                 u32                     version;
 106                 int                     port;
 107                 unsigned short          protocol;
 108         } mount_server;
 109
 110         struct {
 111                 struct sockaddr_storage address;
 112                 size_t                  addrlen;
 113                 char                    *hostname;
 114                 char                    *export_path;
 115                 int                     port;
 116                 unsigned short          protocol;
 117         } nfs_server;
 118
 119         struct security_mnt_opts lsm_opts;
 120         struct net              *net;
 121 };
 122
 123 /* mount_clnt.c */
 124 struct nfs_mount_request {
 125         struct sockaddr         *sap;
 126         size_t                  salen;
 127         char                    *hostname;
 128         char                    *dirpath;
 129         u32                     version;
 130         unsigned short          protocol;
 131         struct nfs_fh           *fh;
 132         int                     noresvport;
 133         unsigned int            *auth_flav_len;
 134         rpc_authflavor_t        *auth_flavs;
 135         struct net              *net;
 136 };
 137
 138 struct nfs_mount_info {
 139         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
 140         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
 141         struct nfs_parsed_mount_data *parsed;
 142         struct nfs_clone_mount *cloned;
 143         struct nfs_fh *mntfh;
 144 };
 145
 146 extern int nfs_mount(struct nfs_mount_request *info);
 147 extern void nfs_umount(const struct nfs_mount_request *info);
 148
 149 /* client.c */
 150 extern const struct rpc_program nfs_program;
 151 extern void nfs_clients_init(struct net *net);
 152 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 153 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
 154 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
 155                                   rpc_authflavor_t);
 156 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 157 void nfs_server_insert_lists(struct nfs_server *);
 158 void nfs_server_remove_lists(struct nfs_server *);
 159 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
 160 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 161                 rpc_authflavor_t);
 162 struct nfs_server *nfs_alloc_server(void);
 163 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 164
 165 extern void nfs_cleanup_cb_ident_idr(struct net *);
 166 extern void nfs_put_client(struct nfs_client *);
 167 extern void nfs_free_client(struct nfs_client *);
 168 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 169 extern struct nfs_client *
 170 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 171                                 struct nfs4_sessionid *, u32);
 172 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
 173                                         struct nfs_subversion *);
 174 extern struct nfs_server *nfs4_create_server(
 175                                         struct nfs_mount_info *,
 176                                         struct nfs_subversion *);
 177 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 178                                                       struct nfs_fh *);
 179 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 180                                         struct sockaddr *sap, size_t salen,
 181                                         struct net *net);
 182 extern void nfs_free_server(struct nfs_server *server);
 183 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 184                                            struct nfs_fh *,
 185                                            struct nfs_fattr *,
 186                                            rpc_authflavor_t);
 187 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 188 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 189 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 190                                              const struct sockaddr *ds_addr,
 191                                              int ds_addrlen, int ds_proto,
 192                                              unsigned int ds_timeo,
 193                                              unsigned int ds_retrans,
 194                                              u32 minor_version,
 195                                              rpc_authflavor_t au_flavor);
 196 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 197                                                 struct inode *);
 198 extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
 199                         const struct sockaddr *ds_addr, int ds_addrlen,
 200                         int ds_proto, unsigned int ds_timeo,
 201                         unsigned int ds_retrans, rpc_authflavor_t au_flavor);
 202 #ifdef CONFIG_PROC_FS
 203 extern int __init nfs_fs_proc_init(void);
 204 extern void nfs_fs_proc_exit(void);
 205 extern int nfs_fs_proc_net_init(struct net *net);
 206 extern void nfs_fs_proc_net_exit(struct net *net);
 207 #else
 208 static inline int nfs_fs_proc_net_init(struct net *net)
 209 {
 210         return 0;
 211 }
 212 static inline void nfs_fs_proc_net_exit(struct net *net)
 213 {
 214 }
 215 static inline int nfs_fs_proc_init(void)
 216 {
 217         return 0;
 218 }
 219 static inline void nfs_fs_proc_exit(void)
 220 {
 221 }
 222 #endif
 223
 224 /* callback_xdr.c */
 225 extern struct svc_version nfs4_callback_version1;
 226 extern struct svc_version nfs4_callback_version4;
 227
 228 struct nfs_pageio_descriptor;
 229 /* pagelist.c */
 230 extern int __init nfs_init_nfspagecache(void);
 231 extern void nfs_destroy_nfspagecache(void);
 232 extern int __init nfs_init_readpagecache(void);
 233 extern void nfs_destroy_readpagecache(void);
 234 extern int __init nfs_init_writepagecache(void);
 235 extern void nfs_destroy_writepagecache(void);
 236
 237 extern int __init nfs_init_directcache(void);
 238 extern void nfs_destroy_directcache(void);
 239 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 240                               struct nfs_pgio_header *hdr,
 241                               void (*release)(struct nfs_pgio_header *hdr));
 242 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 243 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
 244
 245 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 246 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 247 void nfs_pgio_header_free(struct nfs_pgio_header *);
 248 void nfs_pgio_data_destroy(struct nfs_pgio_header *);
 249 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 250 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 251                       struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
 252                       const struct rpc_call_ops *call_ops, int how, int flags);
 253 void nfs_free_request(struct nfs_page *req);
 254 struct nfs_pgio_mirror *
 255 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 256
 257 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
 258 {
 259         WARN_ON_ONCE(desc->pg_mirror_count < 1);
 260         return desc->pg_mirror_count > 1;
 261 }
 262
 263 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 264                 const struct nfs_open_context *ctx2)
 265 {
 266         return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
 267 }
 268
 269 /* nfs2xdr.c */
 270 extern struct rpc_procinfo nfs_procedures[];
 271 extern int nfs2_decode_dirent(struct xdr_stream *,
 272                                 struct nfs_entry *, int);
 273
 274 /* nfs3xdr.c */
 275 extern struct rpc_procinfo nfs3_procedures[];
 276 extern int nfs3_decode_dirent(struct xdr_stream *,
 277                                 struct nfs_entry *, int);
 278
 279 /* nfs4xdr.c */
 280 #if IS_ENABLED(CONFIG_NFS_V4)
 281 extern int nfs4_decode_dirent(struct xdr_stream *,
 282                                 struct nfs_entry *, int);
 283 #endif
 284 #ifdef CONFIG_NFS_V4_1
 285 extern const u32 nfs41_maxread_overhead;
 286 extern const u32 nfs41_maxwrite_overhead;
 287 extern const u32 nfs41_maxgetdevinfo_overhead;
 288 #endif
 289
 290 /* nfs4proc.c */
 291 #if IS_ENABLED(CONFIG_NFS_V4)
 292 extern struct rpc_procinfo nfs4_procedures[];
 293 #endif
 294
 295 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 296 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 297 static inline struct nfs4_label *
 298 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 299 {
 300         if (!dst || !src)
 301                 return NULL;
 302
 303         if (src->len > NFS4_MAXLABELLEN)
 304                 return NULL;
 305
 306         dst->lfs = src->lfs;
 307         dst->pi = src->pi;
 308         dst->len = src->len;
 309         memcpy(dst->label, src->label, src->len);
 310
 311         return dst;
 312 }
 313 static inline void nfs4_label_free(struct nfs4_label *label)
 314 {
 315         if (label) {
 316                 kfree(label->label);
 317                 kfree(label);
 318         }
 319         return;
 320 }
 321
 322 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 323 {
 324         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 325                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 326 }
 327 #else
 328 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 329 static inline void nfs4_label_free(void *label) {}
 330 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 331 {
 332 }
 333 static inline struct nfs4_label *
 334 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 335 {
 336         return NULL;
 337 }
 338 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 339
 340 /* proc.c */
 341 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 342 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 343                            const struct nfs_client_initdata *);
 344
 345 /* dir.c */
 346 extern void nfs_force_use_readdirplus(struct inode *dir);
 347 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 348                                             struct shrink_control *sc);
 349 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 350                                            struct shrink_control *sc);
 351 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 352 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 353 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 354 int nfs_rmdir(struct inode *, struct dentry *);
 355 int nfs_unlink(struct inode *, struct dentry *);
 356 int nfs_symlink(struct inode *, struct dentry *, const char *);
 357 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 358 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 359 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 360
 361 /* file.c */
 362 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 363 loff_t nfs_file_llseek(struct file *, loff_t, int);
 364 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 365 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
 366                              size_t, unsigned int);
 367 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 368 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 369 int nfs_file_release(struct inode *, struct file *);
 370 int nfs_lock(struct file *, int, struct file_lock *);
 371 int nfs_flock(struct file *, int, struct file_lock *);
 372 int nfs_check_flags(int);
 373
 374 /* inode.c */
 375 extern struct workqueue_struct *nfsiod_workqueue;
 376 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 377 extern void nfs_destroy_inode(struct inode *);
 378 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 379 extern int nfs_drop_inode(struct inode *);
 380 extern void nfs_clear_inode(struct inode *);
 381 extern void nfs_evict_inode(struct inode *);
 382 void nfs_zap_acl_cache(struct inode *inode);
 383 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 384 extern int nfs_wait_atomic_killable(atomic_t *p);
 385
 386 /* super.c */
 387 extern const struct super_operations nfs_sops;
 388 extern struct file_system_type nfs_fs_type;
 389 extern struct file_system_type nfs_xdev_fs_type;
 390 #if IS_ENABLED(CONFIG_NFS_V4)
 391 extern struct file_system_type nfs4_xdev_fs_type;
 392 extern struct file_system_type nfs4_referral_fs_type;
 393 #endif
 394 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 395 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
 396                         struct nfs_subversion *);
 397 void nfs_initialise_sb(struct super_block *);
 398 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 399 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 400 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
 401                                    struct nfs_mount_info *, struct nfs_subversion *);
 402 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
 403 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
 404                 const char *, struct nfs_mount_info *);
 405 void nfs_kill_super(struct super_block *);
 406 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
 407
 408 extern struct rpc_stat nfs_rpcstat;
 409
 410 extern int __init register_nfs_fs(void);
 411 extern void __exit unregister_nfs_fs(void);
 412 extern bool nfs_sb_active(struct super_block *sb);
 413 extern void nfs_sb_deactive(struct super_block *sb);
 414
 415 /* namespace.c */
 416 #define NFS_PATH_CANONICAL 1
 417 extern char *nfs_path(char **p, struct dentry *dentry,
 418                       char *buffer, ssize_t buflen, unsigned flags);
 419 extern struct vfsmount *nfs_d_automount(struct path *path);
 420 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
 421                               struct nfs_fh *, struct nfs_fattr *);
 422 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
 423                                  struct nfs_fattr *, rpc_authflavor_t);
 424
 425 /* getroot.c */
 426 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 427                                    const char *);
 428 #if IS_ENABLED(CONFIG_NFS_V4)
 429 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 430                                     const char *);
 431
 432 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 433 #endif
 434
 435 struct nfs_pgio_completion_ops;
 436 /* read.c */
 437 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 438                         struct inode *inode, bool force_mds,
 439                         const struct nfs_pgio_completion_ops *compl_ops);
 440 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 441 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 442
 443 /* super.c */
 444 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 445 void nfs_umount_begin(struct super_block *);
 446 int  nfs_statfs(struct dentry *, struct kstatfs *);
 447 int  nfs_show_options(struct seq_file *, struct dentry *);
 448 int  nfs_show_devname(struct seq_file *, struct dentry *);
 449 int  nfs_show_path(struct seq_file *, struct dentry *);
 450 int  nfs_show_stats(struct seq_file *, struct dentry *);
 451 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 452
 453 /* write.c */
 454 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 455                         struct inode *inode, int ioflags, bool force_mds,
 456                         const struct nfs_pgio_completion_ops *compl_ops);
 457 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 458 extern void nfs_commit_free(struct nfs_commit_data *p);
 459 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 460 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 461 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 462                                struct nfs_commit_data *data,
 463                                const struct nfs_rpc_ops *nfs_ops,
 464                                const struct rpc_call_ops *call_ops,
 465                                int how, int flags);
 466 extern void nfs_init_commit(struct nfs_commit_data *data,
 467                             struct list_head *head,
 468                             struct pnfs_layout_segment *lseg,
 469                             struct nfs_commit_info *cinfo);
 470 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 471                          struct nfs_commit_info *cinfo, int max);
 472 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 473 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 474                     struct nfs_commit_info *cinfo);
 475 void nfs_mark_request_commit(struct nfs_page *req,
 476                              struct pnfs_layout_segment *lseg,
 477                              struct nfs_commit_info *cinfo,
 478                              u32 ds_commit_idx);
 479 int nfs_write_need_commit(struct nfs_pgio_header *);
 480 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 481 int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
 482 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 483                             int how, struct nfs_commit_info *cinfo);
 484 void nfs_retry_commit(struct list_head *page_list,
 485                       struct pnfs_layout_segment *lseg,
 486                       struct nfs_commit_info *cinfo,
 487                       u32 ds_commit_idx);
 488 void nfs_commitdata_release(struct nfs_commit_data *data);
 489 void nfs_request_add_commit_list(struct nfs_page *req,
 490                                  struct nfs_commit_info *cinfo);
 491 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 492                 struct list_head *dst,
 493                 struct nfs_commit_info *cinfo);
 494 void nfs_request_remove_commit_list(struct nfs_page *req,
 495                                     struct nfs_commit_info *cinfo);
 496 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 497                     struct inode *inode,
 498                     struct nfs_direct_req *dreq);
 499 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 500 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
 501 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 502
 503 #ifdef CONFIG_MIGRATION
 504 extern int nfs_migrate_page(struct address_space *,
 505                 struct page *, struct page *, enum migrate_mode);
 506 #else
 507 #define nfs_migrate_page NULL
 508 #endif
 509
 510 /* unlink.c */
 511 extern struct rpc_task *
 512 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 513                  struct dentry *old_dentry, struct dentry *new_dentry,
 514                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 515 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 516
 517 /* direct.c */
 518 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 519                               struct nfs_direct_req *dreq);
 520 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 521
 522 /* nfs4proc.c */
 523 extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
 524 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 525                             const struct nfs_client_initdata *);
 526 extern int nfs40_walk_client_list(struct nfs_client *clp,
 527                                 struct nfs_client **result,
 528                                 struct rpc_cred *cred);
 529 extern int nfs41_walk_client_list(struct nfs_client *clp,
 530                                 struct nfs_client **result,
 531                                 struct rpc_cred *cred);
 532
 533 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 534 {
 535         inode = igrab(inode);
 536         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
 537                 iput(inode);
 538                 inode = NULL;
 539         }
 540         return inode;
 541 }
 542
 543 static inline void nfs_iput_and_deactive(struct inode *inode)
 544 {
 545         if (inode != NULL) {
 546                 struct super_block *sb = inode->i_sb;
 547
 548                 iput(inode);
 549                 nfs_sb_deactive(sb);
 550         }
 551 }
 552
 553 /*
 554  * Determine the device name as a string
 555  */
 556 static inline char *nfs_devname(struct dentry *dentry,
 557                                 char *buffer, ssize_t buflen)
 558 {
 559         char *dummy;
 560         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 561 }
 562
 563 /*
 564  * Determine the actual block size (and log2 thereof)
 565  */
 566 static inline
 567 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 568 {
 569         /* make sure blocksize is a power of two */
 570         if ((bsize & (bsize - 1)) || nrbitsp) {
 571                 unsigned char   nrbits;
 572
 573                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 574                         ;
 575                 bsize = 1 << nrbits;
 576                 if (nrbitsp)
 577                         *nrbitsp = nrbits;
 578         }
 579
 580         return bsize;
 581 }
 582
 583 /*
 584  * Calculate the number of 512byte blocks used.
 585  */
 586 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 587 {
 588         blkcnt_t used = (tsize + 511) >> 9;
 589         return (used > ULONG_MAX) ? ULONG_MAX : used;
 590 }
 591
 592 /*
 593  * Compute and set NFS server blocksize
 594  */
 595 static inline
 596 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 597 {
 598         if (bsize < NFS_MIN_FILE_IO_SIZE)
 599                 bsize = NFS_DEF_FILE_IO_SIZE;
 600         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 601                 bsize = NFS_MAX_FILE_IO_SIZE;
 602
 603         return nfs_block_bits(bsize, nrbitsp);
 604 }
 605
 606 /*
 607  * Determine the maximum file size for a superblock
 608  */
 609 static inline
 610 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 611 {
 612         sb->s_maxbytes = (loff_t)maxfilesize;
 613         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 614                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 615 }
 616
 617 /*
 618  * Record the page as unstable and mark its inode as dirty.
 619  */
 620 static inline
 621 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 622 {
 623         if (!cinfo->dreq) {
 624                 struct inode *inode = page_file_mapping(page)->host;
 625
 626                 inc_zone_page_state(page, NR_UNSTABLE_NFS);
 627                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
 628                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 629         }
 630 }
 631
 632 /*
 633  * Determine the number of bytes of data the page contains
 634  */
 635 static inline
 636 unsigned int nfs_page_length(struct page *page)
 637 {
 638         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 639
 640         if (i_size > 0) {
 641                 pgoff_t page_index = page_file_index(page);
 642                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
 643                 if (page_index < end_index)
 644                         return PAGE_SIZE;
 645                 if (page_index == end_index)
 646                         return ((i_size - 1) & ~PAGE_MASK) + 1;
 647         }
 648         return 0;
 649 }
 650
 651 /*
 652  * Convert a umode to a dirent->d_type
 653  */
 654 static inline
 655 unsigned char nfs_umode_to_dtype(umode_t mode)
 656 {
 657         return (mode >> 12) & 15;
 658 }
 659
 660 /*
 661  * Determine the number of pages in an array of length 'len' and
 662  * with a base offset of 'base'
 663  */
 664 static inline
 665 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 666 {
 667         return ((unsigned long)len + (unsigned long)base +
 668                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 669 }
 670
 671 /*
 672  * Convert a struct timespec into a 64-bit change attribute
 673  *
 674  * This does approximately the same thing as timespec_to_ns(),
 675  * but for calculation efficiency, we multiply the seconds by
 676  * 1024*1024*1024.
 677  */
 678 static inline
 679 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
 680 {
 681         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 682 }
 683
 684 #ifdef CONFIG_CRC32
 685 /**
 686  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 687  * @fh - pointer to filehandle
 688  *
 689  * returns a crc32 hash for the filehandle that is compatible with
 690  * the one displayed by "wireshark".
 691  */
 692 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 693 {
 694         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 695 }
 696 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 697 {
 698         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 699                                 NFS4_STATEID_OTHER_SIZE);
 700 }
 701 #else
 702 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 703 {
 704         return 0;
 705 }
 706 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
 707 {
 708         return 0;
 709 }
 710 #endif
 711
 712 static inline bool nfs_error_is_fatal(int err)
 713 {
 714         switch (err) {
 715         case -ERESTARTSYS:
 716         case -EIO:
 717         case -ENOSPC:
 718         case -EROFS:
 719         case -E2BIG:
 720                 return true;
 721         default:
 722                 return false;
 723         }
 724 }