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 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
  62 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
  63
  64 /*
  65  * Maximum number of pages that readdir can use for creating
  66  * a vmapped array of pages.
  67  */
  68 #define NFS_MAX_READDIR_PAGES 8
  69
  70 struct nfs_client_initdata {
  71         unsigned long init_flags;
  72         const char *hostname;                   /* Hostname of the server */
  73         const struct sockaddr *addr;            /* Address of the server */
  74         const char *nodename;                   /* Hostname of the client */
  75         const char *ip_addr;                    /* IP address of the client */
  76         size_t addrlen;
  77         struct nfs_subversion *nfs_mod;
  78         int proto;
  79         u32 minorversion;
  80         struct net *net;
  81         const struct rpc_timeout *timeparms;
  82 };
  83
  84 /*
  85  * In-kernel mount arguments
  86  */
  87 struct nfs_parsed_mount_data {
  88         int                     flags;
  89         unsigned int            rsize, wsize;
  90         unsigned int            timeo, retrans;
  91         unsigned int            acregmin, acregmax,
  92                                 acdirmin, acdirmax;
  93         unsigned int            namlen;
  94         unsigned int            options;
  95         unsigned int            bsize;
  96         struct nfs_auth_info    auth_info;
  97         rpc_authflavor_t        selected_flavor;
  98         char                    *client_address;
  99         unsigned int            version;
 100         unsigned int            minorversion;
 101         char                    *fscache_uniq;
 102         bool                    need_mount;
 103
 104         struct {
 105                 struct sockaddr_storage address;
 106                 size_t                  addrlen;
 107                 char                    *hostname;
 108                 u32                     version;
 109                 int                     port;
 110                 unsigned short          protocol;
 111         } mount_server;
 112
 113         struct {
 114                 struct sockaddr_storage address;
 115                 size_t                  addrlen;
 116                 char                    *hostname;
 117                 char                    *export_path;
 118                 int                     port;
 119                 unsigned short          protocol;
 120         } nfs_server;
 121
 122         struct security_mnt_opts lsm_opts;
 123         struct net              *net;
 124 };
 125
 126 /* mount_clnt.c */
 127 struct nfs_mount_request {
 128         struct sockaddr         *sap;
 129         size_t                  salen;
 130         char                    *hostname;
 131         char                    *dirpath;
 132         u32                     version;
 133         unsigned short          protocol;
 134         struct nfs_fh           *fh;
 135         int                     noresvport;
 136         unsigned int            *auth_flav_len;
 137         rpc_authflavor_t        *auth_flavs;
 138         struct net              *net;
 139 };
 140
 141 struct nfs_mount_info {
 142         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
 143         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
 144         struct nfs_parsed_mount_data *parsed;
 145         struct nfs_clone_mount *cloned;
 146         struct nfs_fh *mntfh;
 147 };
 148
 149 extern int nfs_mount(struct nfs_mount_request *info);
 150 extern void nfs_umount(const struct nfs_mount_request *info);
 151
 152 /* client.c */
 153 extern const struct rpc_program nfs_program;
 154 extern void nfs_clients_init(struct net *net);
 155 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 156 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
 157 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
 158 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 159 void nfs_server_insert_lists(struct nfs_server *);
 160 void nfs_server_remove_lists(struct nfs_server *);
 161 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
 162 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 163                 rpc_authflavor_t);
 164 struct nfs_server *nfs_alloc_server(void);
 165 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 166
 167 extern void nfs_cleanup_cb_ident_idr(struct net *);
 168 extern void nfs_put_client(struct nfs_client *);
 169 extern void nfs_free_client(struct nfs_client *);
 170 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 171 extern struct nfs_client *
 172 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 173                                 struct nfs4_sessionid *, u32);
 174 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
 175                                         struct nfs_subversion *);
 176 extern struct nfs_server *nfs4_create_server(
 177                                         struct nfs_mount_info *,
 178                                         struct nfs_subversion *);
 179 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 180                                                       struct nfs_fh *);
 181 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 182                                         struct sockaddr *sap, size_t salen,
 183                                         struct net *net);
 184 extern void nfs_free_server(struct nfs_server *server);
 185 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 186                                            struct nfs_fh *,
 187                                            struct nfs_fattr *,
 188                                            rpc_authflavor_t);
 189 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 190 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 191 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 192                                              const struct sockaddr *ds_addr,
 193                                              int ds_addrlen, int ds_proto,
 194                                              unsigned int ds_timeo,
 195                                              unsigned int ds_retrans,
 196                                              u32 minor_version);
 197 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 198                                                 struct inode *);
 199 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 200                         const struct sockaddr *ds_addr, int ds_addrlen,
 201                         int ds_proto, unsigned int ds_timeo,
 202                         unsigned int ds_retrans);
 203 #ifdef CONFIG_PROC_FS
 204 extern int __init nfs_fs_proc_init(void);
 205 extern void nfs_fs_proc_exit(void);
 206 extern int nfs_fs_proc_net_init(struct net *net);
 207 extern void nfs_fs_proc_net_exit(struct net *net);
 208 #else
 209 static inline int nfs_fs_proc_net_init(struct net *net)
 210 {
 211         return 0;
 212 }
 213 static inline void nfs_fs_proc_net_exit(struct net *net)
 214 {
 215 }
 216 static inline int nfs_fs_proc_init(void)
 217 {
 218         return 0;
 219 }
 220 static inline void nfs_fs_proc_exit(void)
 221 {
 222 }
 223 #endif
 224
 225 /* callback_xdr.c */
 226 extern struct svc_version nfs4_callback_version1;
 227 extern struct svc_version nfs4_callback_version4;
 228
 229 struct nfs_pageio_descriptor;
 230 /* pagelist.c */
 231 extern int __init nfs_init_nfspagecache(void);
 232 extern void nfs_destroy_nfspagecache(void);
 233 extern int __init nfs_init_readpagecache(void);
 234 extern void nfs_destroy_readpagecache(void);
 235 extern int __init nfs_init_writepagecache(void);
 236 extern void nfs_destroy_writepagecache(void);
 237
 238 extern int __init nfs_init_directcache(void);
 239 extern void nfs_destroy_directcache(void);
 240 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 241                               struct nfs_pgio_header *hdr,
 242                               void (*release)(struct nfs_pgio_header *hdr));
 243 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 244 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
 245
 246 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 247 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 248 void nfs_pgio_header_free(struct nfs_pgio_header *);
 249 void nfs_pgio_data_destroy(struct nfs_pgio_header *);
 250 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 251 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 252                       struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
 253                       const struct rpc_call_ops *call_ops, int how, int flags);
 254 void nfs_free_request(struct nfs_page *req);
 255 struct nfs_pgio_mirror *
 256 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 257
 258 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
 259 {
 260         WARN_ON_ONCE(desc->pg_mirror_count < 1);
 261         return desc->pg_mirror_count > 1;
 262 }
 263
 264 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 265                 const struct nfs_open_context *ctx2)
 266 {
 267         return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
 268 }
 269
 270 /* nfs2xdr.c */
 271 extern struct rpc_procinfo nfs_procedures[];
 272 extern int nfs2_decode_dirent(struct xdr_stream *,
 273                                 struct nfs_entry *, int);
 274
 275 /* nfs3xdr.c */
 276 extern struct rpc_procinfo nfs3_procedures[];
 277 extern int nfs3_decode_dirent(struct xdr_stream *,
 278                                 struct nfs_entry *, int);
 279
 280 /* nfs4xdr.c */
 281 #if IS_ENABLED(CONFIG_NFS_V4)
 282 extern int nfs4_decode_dirent(struct xdr_stream *,
 283                                 struct nfs_entry *, int);
 284 #endif
 285 #ifdef CONFIG_NFS_V4_1
 286 extern const u32 nfs41_maxread_overhead;
 287 extern const u32 nfs41_maxwrite_overhead;
 288 extern const u32 nfs41_maxgetdevinfo_overhead;
 289 #endif
 290
 291 /* nfs4proc.c */
 292 #if IS_ENABLED(CONFIG_NFS_V4)
 293 extern struct rpc_procinfo nfs4_procedures[];
 294 #endif
 295
 296 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 297 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 298 static inline struct nfs4_label *
 299 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 300 {
 301         if (!dst || !src)
 302                 return NULL;
 303
 304         if (src->len > NFS4_MAXLABELLEN)
 305                 return NULL;
 306
 307         dst->lfs = src->lfs;
 308         dst->pi = src->pi;
 309         dst->len = src->len;
 310         memcpy(dst->label, src->label, src->len);
 311
 312         return dst;
 313 }
 314 static inline void nfs4_label_free(struct nfs4_label *label)
 315 {
 316         if (label) {
 317                 kfree(label->label);
 318                 kfree(label);
 319         }
 320         return;
 321 }
 322
 323 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 324 {
 325         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 326                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 327 }
 328 #else
 329 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 330 static inline void nfs4_label_free(void *label) {}
 331 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 332 {
 333 }
 334 static inline struct nfs4_label *
 335 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 336 {
 337         return NULL;
 338 }
 339 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 340
 341 /* proc.c */
 342 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 343 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 344                            const struct nfs_client_initdata *);
 345
 346 /* dir.c */
 347 extern void nfs_advise_use_readdirplus(struct inode *dir);
 348 extern void nfs_force_use_readdirplus(struct inode *dir);
 349 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 350                                             struct shrink_control *sc);
 351 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 352                                            struct shrink_control *sc);
 353 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 354 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 355 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 356 int nfs_rmdir(struct inode *, struct dentry *);
 357 int nfs_unlink(struct inode *, struct dentry *);
 358 int nfs_symlink(struct inode *, struct dentry *, const char *);
 359 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 360 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 361 int nfs_rename(struct inode *, struct dentry *,
 362                struct inode *, struct dentry *, unsigned int);
 363
 364 /* file.c */
 365 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 366 loff_t nfs_file_llseek(struct file *, loff_t, int);
 367 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 368 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 369 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 370 int nfs_file_release(struct inode *, struct file *);
 371 int nfs_lock(struct file *, int, struct file_lock *);
 372 int nfs_flock(struct file *, int, struct file_lock *);
 373 int nfs_check_flags(int);
 374
 375 /* inode.c */
 376 extern struct workqueue_struct *nfsiod_workqueue;
 377 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 378 extern void nfs_destroy_inode(struct inode *);
 379 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 380 extern int nfs_drop_inode(struct inode *);
 381 extern void nfs_clear_inode(struct inode *);
 382 extern void nfs_evict_inode(struct inode *);
 383 void nfs_zap_acl_cache(struct inode *inode);
 384 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
 385 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 386 extern int nfs_wait_atomic_killable(atomic_t *p);
 387
 388 /* super.c */
 389 extern const struct super_operations nfs_sops;
 390 extern struct file_system_type nfs_fs_type;
 391 extern struct file_system_type nfs_xdev_fs_type;
 392 #if IS_ENABLED(CONFIG_NFS_V4)
 393 extern struct file_system_type nfs4_xdev_fs_type;
 394 extern struct file_system_type nfs4_referral_fs_type;
 395 #endif
 396 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 397 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
 398                         struct nfs_subversion *);
 399 void nfs_initialise_sb(struct super_block *);
 400 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 401 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 402 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
 403                                    struct nfs_mount_info *, struct nfs_subversion *);
 404 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
 405 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
 406                 const char *, struct nfs_mount_info *);
 407 void nfs_kill_super(struct super_block *);
 408 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
 409
 410 extern struct rpc_stat nfs_rpcstat;
 411
 412 extern int __init register_nfs_fs(void);
 413 extern void __exit unregister_nfs_fs(void);
 414 extern bool nfs_sb_active(struct super_block *sb);
 415 extern void nfs_sb_deactive(struct super_block *sb);
 416
 417 /* io.c */
 418 extern void nfs_start_io_read(struct inode *inode);
 419 extern void nfs_end_io_read(struct inode *inode);
 420 extern void nfs_start_io_write(struct inode *inode);
 421 extern void nfs_end_io_write(struct inode *inode);
 422 extern void nfs_start_io_direct(struct inode *inode);
 423 extern void nfs_end_io_direct(struct inode *inode);
 424
 425 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
 426 {
 427         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
 428 }
 429
 430 /* namespace.c */
 431 #define NFS_PATH_CANONICAL 1
 432 extern char *nfs_path(char **p, struct dentry *dentry,
 433                       char *buffer, ssize_t buflen, unsigned flags);
 434 extern struct vfsmount *nfs_d_automount(struct path *path);
 435 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
 436                               struct nfs_fh *, struct nfs_fattr *);
 437 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
 438                                  struct nfs_fattr *, rpc_authflavor_t);
 439
 440 /* getroot.c */
 441 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 442                                    const char *);
 443 #if IS_ENABLED(CONFIG_NFS_V4)
 444 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 445                                     const char *);
 446
 447 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 448 #endif
 449
 450 struct nfs_pgio_completion_ops;
 451 /* read.c */
 452 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 453                         struct inode *inode, bool force_mds,
 454                         const struct nfs_pgio_completion_ops *compl_ops);
 455 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 456 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 457
 458 /* super.c */
 459 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 460 void nfs_umount_begin(struct super_block *);
 461 int  nfs_statfs(struct dentry *, struct kstatfs *);
 462 int  nfs_show_options(struct seq_file *, struct dentry *);
 463 int  nfs_show_devname(struct seq_file *, struct dentry *);
 464 int  nfs_show_path(struct seq_file *, struct dentry *);
 465 int  nfs_show_stats(struct seq_file *, struct dentry *);
 466 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 467
 468 /* write.c */
 469 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 470                         struct inode *inode, int ioflags, bool force_mds,
 471                         const struct nfs_pgio_completion_ops *compl_ops);
 472 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 473 extern void nfs_commit_free(struct nfs_commit_data *p);
 474 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 475 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 476 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 477                                struct nfs_commit_data *data,
 478                                const struct nfs_rpc_ops *nfs_ops,
 479                                const struct rpc_call_ops *call_ops,
 480                                int how, int flags);
 481 extern void nfs_init_commit(struct nfs_commit_data *data,
 482                             struct list_head *head,
 483                             struct pnfs_layout_segment *lseg,
 484                             struct nfs_commit_info *cinfo);
 485 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 486                          struct nfs_commit_info *cinfo, int max);
 487 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 488 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 489                     struct nfs_commit_info *cinfo);
 490 void nfs_mark_request_commit(struct nfs_page *req,
 491                              struct pnfs_layout_segment *lseg,
 492                              struct nfs_commit_info *cinfo,
 493                              u32 ds_commit_idx);
 494 int nfs_write_need_commit(struct nfs_pgio_header *);
 495 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 496 int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
 497 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 498                             int how, struct nfs_commit_info *cinfo);
 499 void nfs_retry_commit(struct list_head *page_list,
 500                       struct pnfs_layout_segment *lseg,
 501                       struct nfs_commit_info *cinfo,
 502                       u32 ds_commit_idx);
 503 void nfs_commitdata_release(struct nfs_commit_data *data);
 504 void nfs_request_add_commit_list(struct nfs_page *req,
 505                                  struct nfs_commit_info *cinfo);
 506 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 507                 struct list_head *dst,
 508                 struct nfs_commit_info *cinfo);
 509 void nfs_request_remove_commit_list(struct nfs_page *req,
 510                                     struct nfs_commit_info *cinfo);
 511 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 512                     struct inode *inode,
 513                     struct nfs_direct_req *dreq);
 514 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 515 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
 516 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 517
 518 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
 519                 loff_t lstart, loff_t lend);
 520
 521 #ifdef CONFIG_NFS_V4_1
 522 static inline
 523 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 524 {
 525         int i;
 526
 527         for (i = 0; i < cinfo->nbuckets; i++)
 528                 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
 529 }
 530 #else
 531 static inline
 532 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 533 {
 534 }
 535 #endif
 536
 537 #ifdef CONFIG_MIGRATION
 538 extern int nfs_migrate_page(struct address_space *,
 539                 struct page *, struct page *, enum migrate_mode);
 540 #endif
 541
 542 static inline int
 543 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
 544                 const struct nfs_write_verifier *v2)
 545 {
 546         return memcmp(v1->data, v2->data, sizeof(v1->data));
 547 }
 548
 549 /* unlink.c */
 550 extern struct rpc_task *
 551 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 552                  struct dentry *old_dentry, struct dentry *new_dentry,
 553                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 554 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 555
 556 /* direct.c */
 557 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 558                               struct nfs_direct_req *dreq);
 559 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 560
 561 /* nfs4proc.c */
 562 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 563                             const struct nfs_client_initdata *);
 564 extern int nfs40_walk_client_list(struct nfs_client *clp,
 565                                 struct nfs_client **result,
 566                                 struct rpc_cred *cred);
 567 extern int nfs41_walk_client_list(struct nfs_client *clp,
 568                                 struct nfs_client **result,
 569                                 struct rpc_cred *cred);
 570 extern int nfs4_test_session_trunk(struct rpc_clnt *,
 571                                 struct rpc_xprt *,
 572                                 void *);
 573
 574 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 575 {
 576         inode = igrab(inode);
 577         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
 578                 iput(inode);
 579                 inode = NULL;
 580         }
 581         return inode;
 582 }
 583
 584 static inline void nfs_iput_and_deactive(struct inode *inode)
 585 {
 586         if (inode != NULL) {
 587                 struct super_block *sb = inode->i_sb;
 588
 589                 iput(inode);
 590                 nfs_sb_deactive(sb);
 591         }
 592 }
 593
 594 /*
 595  * Determine the device name as a string
 596  */
 597 static inline char *nfs_devname(struct dentry *dentry,
 598                                 char *buffer, ssize_t buflen)
 599 {
 600         char *dummy;
 601         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 602 }
 603
 604 /*
 605  * Determine the actual block size (and log2 thereof)
 606  */
 607 static inline
 608 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 609 {
 610         /* make sure blocksize is a power of two */
 611         if ((bsize & (bsize - 1)) || nrbitsp) {
 612                 unsigned char   nrbits;
 613
 614                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 615                         ;
 616                 bsize = 1 << nrbits;
 617                 if (nrbitsp)
 618                         *nrbitsp = nrbits;
 619         }
 620
 621         return bsize;
 622 }
 623
 624 /*
 625  * Calculate the number of 512byte blocks used.
 626  */
 627 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 628 {
 629         blkcnt_t used = (tsize + 511) >> 9;
 630         return (used > ULONG_MAX) ? ULONG_MAX : used;
 631 }
 632
 633 /*
 634  * Compute and set NFS server blocksize
 635  */
 636 static inline
 637 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 638 {
 639         if (bsize < NFS_MIN_FILE_IO_SIZE)
 640                 bsize = NFS_DEF_FILE_IO_SIZE;
 641         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 642                 bsize = NFS_MAX_FILE_IO_SIZE;
 643
 644         return nfs_block_bits(bsize, nrbitsp);
 645 }
 646
 647 /*
 648  * Determine the maximum file size for a superblock
 649  */
 650 static inline
 651 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 652 {
 653         sb->s_maxbytes = (loff_t)maxfilesize;
 654         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 655                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 656 }
 657
 658 /*
 659  * Record the page as unstable and mark its inode as dirty.
 660  */
 661 static inline
 662 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 663 {
 664         if (!cinfo->dreq) {
 665                 struct inode *inode = page_file_mapping(page)->host;
 666
 667                 inc_node_page_state(page, NR_UNSTABLE_NFS);
 668                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
 669                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 670         }
 671 }
 672
 673 /*
 674  * Determine the number of bytes of data the page contains
 675  */
 676 static inline
 677 unsigned int nfs_page_length(struct page *page)
 678 {
 679         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 680
 681         if (i_size > 0) {
 682                 pgoff_t index = page_index(page);
 683                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
 684                 if (index < end_index)
 685                         return PAGE_SIZE;
 686                 if (index == end_index)
 687                         return ((i_size - 1) & ~PAGE_MASK) + 1;
 688         }
 689         return 0;
 690 }
 691
 692 /*
 693  * Convert a umode to a dirent->d_type
 694  */
 695 static inline
 696 unsigned char nfs_umode_to_dtype(umode_t mode)
 697 {
 698         return (mode >> 12) & 15;
 699 }
 700
 701 /*
 702  * Determine the number of pages in an array of length 'len' and
 703  * with a base offset of 'base'
 704  */
 705 static inline
 706 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 707 {
 708         return ((unsigned long)len + (unsigned long)base +
 709                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 710 }
 711
 712 /*
 713  * Convert a struct timespec into a 64-bit change attribute
 714  *
 715  * This does approximately the same thing as timespec_to_ns(),
 716  * but for calculation efficiency, we multiply the seconds by
 717  * 1024*1024*1024.
 718  */
 719 static inline
 720 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
 721 {
 722         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 723 }
 724
 725 #ifdef CONFIG_CRC32
 726 /**
 727  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 728  * @fh - pointer to filehandle
 729  *
 730  * returns a crc32 hash for the filehandle that is compatible with
 731  * the one displayed by "wireshark".
 732  */
 733 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 734 {
 735         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 736 }
 737 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 738 {
 739         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 740                                 NFS4_STATEID_OTHER_SIZE);
 741 }
 742 #else
 743 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 744 {
 745         return 0;
 746 }
 747 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
 748 {
 749         return 0;
 750 }
 751 #endif
 752
 753 static inline bool nfs_error_is_fatal(int err)
 754 {
 755         switch (err) {
 756         case -ERESTARTSYS:
 757         case -EIO:
 758         case -ENOSPC:
 759         case -EROFS:
 760         case -E2BIG:
 761                 return true;
 762         default:
 763                 return false;
 764         }
 765 }