fs/nfs/internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * NFS internal definitions
   4  */
   5
   6 #include "nfs4_fs.h"
   7 #include <linux/fs_context.h>
   8 #include <linux/security.h>
   9 #include <linux/crc32.h>
  10 #include <linux/sunrpc/addr.h>
  11 #include <linux/nfs_page.h>
  12 #include <linux/wait_bit.h>
  13
  14 #define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
  15
  16 extern const struct export_operations nfs_export_ops;
  17
  18 struct nfs_string;
  19 struct nfs_pageio_descriptor;
  20
  21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
  22 {
  23         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
  24                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
  25 }
  26
  27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
  28 {
  29         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
  30             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
  31              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
  32                 return 0;
  33         return 1;
  34 }
  35
  36 static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry)
  37 {
  38         if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL))
  39                 return false;
  40         if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size)
  41                 return false;
  42         return true;
  43 }
  44
  45 /*
  46  * Note: RFC 1813 doesn't limit the number of auth flavors that
  47  * a server can return, so make something up.
  48  */
  49 #define NFS_MAX_SECFLAVORS      (12)
  50
  51 /*
  52  * Value used if the user did not specify a port value.
  53  */
  54 #define NFS_UNSPEC_PORT         (-1)
  55
  56 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
  57 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
  58
  59 struct nfs_client_initdata {
  60         unsigned long init_flags;
  61         const char *hostname;                   /* Hostname of the server */
  62         const struct sockaddr *addr;            /* Address of the server */
  63         const char *nodename;                   /* Hostname of the client */
  64         const char *ip_addr;                    /* IP address of the client */
  65         size_t addrlen;
  66         struct nfs_subversion *nfs_mod;
  67         int proto;
  68         u32 minorversion;
  69         unsigned int nconnect;
  70         unsigned int max_connect;
  71         struct net *net;
  72         const struct rpc_timeout *timeparms;
  73         const struct cred *cred;
  74 };
  75
  76 /*
  77  * In-kernel mount arguments
  78  */
  79 struct nfs_fs_context {
  80         bool                    internal;
  81         bool                    skip_reconfig_option_check;
  82         bool                    need_mount;
  83         bool                    sloppy;
  84         unsigned int            flags;          /* NFS{,4}_MOUNT_* flags */
  85         unsigned int            rsize, wsize;
  86         unsigned int            timeo, retrans;
  87         unsigned int            acregmin, acregmax;
  88         unsigned int            acdirmin, acdirmax;
  89         unsigned int            namlen;
  90         unsigned int            options;
  91         unsigned int            bsize;
  92         struct nfs_auth_info    auth_info;
  93         rpc_authflavor_t        selected_flavor;
  94         char                    *client_address;
  95         unsigned int            version;
  96         unsigned int            minorversion;
  97         char                    *fscache_uniq;
  98         unsigned short          protofamily;
  99         unsigned short          mountfamily;
 100         bool                    has_sec_mnt_opts;
 101
 102         struct {
 103                 union {
 104                         struct sockaddr address;
 105                         struct sockaddr_storage _address;
 106                 };
 107                 size_t                  addrlen;
 108                 char                    *hostname;
 109                 u32                     version;
 110                 int                     port;
 111                 unsigned short          protocol;
 112         } mount_server;
 113
 114         struct {
 115                 union {
 116                         struct sockaddr address;
 117                         struct sockaddr_storage _address;
 118                 };
 119                 size_t                  addrlen;
 120                 char                    *hostname;
 121                 char                    *export_path;
 122                 int                     port;
 123                 unsigned short          protocol;
 124                 unsigned short          nconnect;
 125                 unsigned short          max_connect;
 126                 unsigned short          export_path_len;
 127         } nfs_server;
 128
 129         struct nfs_fh           *mntfh;
 130         struct nfs_server       *server;
 131         struct nfs_subversion   *nfs_mod;
 132
 133         /* Information for a cloned mount. */
 134         struct nfs_clone_mount {
 135                 struct super_block      *sb;
 136                 struct dentry           *dentry;
 137                 struct nfs_fattr        *fattr;
 138                 unsigned int            inherited_bsize;
 139         } clone_data;
 140 };
 141
 142 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ?               \
 143         errorf(fc, fmt, ## __VA_ARGS__) :                       \
 144         ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
 145
 146 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ?         \
 147         errorf(fc, fmt, ## __VA_ARGS__) :                       \
 148         ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
 149
 150 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ?               \
 151         invalf(fc, fmt, ## __VA_ARGS__) :                       \
 152         ({ dprintk(fmt "\n", ## __VA_ARGS__);  -EINVAL; }))
 153
 154 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ?         \
 155         invalf(fc, fmt, ## __VA_ARGS__) :                       \
 156         ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__);  -EINVAL; }))
 157
 158 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ?                \
 159         warnf(fc, fmt, ## __VA_ARGS__) :                        \
 160         ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
 161
 162 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ?          \
 163         warnf(fc, fmt, ## __VA_ARGS__) :                        \
 164         ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
 165
 166 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
 167 {
 168         return fc->fs_private;
 169 }
 170
 171 /* mount_clnt.c */
 172 struct nfs_mount_request {
 173         struct sockaddr         *sap;
 174         size_t                  salen;
 175         char                    *hostname;
 176         char                    *dirpath;
 177         u32                     version;
 178         unsigned short          protocol;
 179         struct nfs_fh           *fh;
 180         int                     noresvport;
 181         unsigned int            *auth_flav_len;
 182         rpc_authflavor_t        *auth_flavs;
 183         struct net              *net;
 184 };
 185
 186 extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans);
 187 extern void nfs_umount(const struct nfs_mount_request *info);
 188
 189 /* client.c */
 190 extern const struct rpc_program nfs_program;
 191 extern void nfs_clients_init(struct net *net);
 192 extern void nfs_clients_exit(struct net *net);
 193 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 194 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
 195 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
 196 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 197 void nfs_server_insert_lists(struct nfs_server *);
 198 void nfs_server_remove_lists(struct nfs_server *);
 199 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
 200 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 201                 rpc_authflavor_t);
 202 struct nfs_server *nfs_alloc_server(void);
 203 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 204
 205 extern void nfs_put_client(struct nfs_client *);
 206 extern void nfs_free_client(struct nfs_client *);
 207 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 208 extern struct nfs_client *
 209 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 210                                 struct nfs4_sessionid *, u32);
 211 extern struct nfs_server *nfs_create_server(struct fs_context *);
 212 extern struct nfs_server *nfs4_create_server(struct fs_context *);
 213 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
 214 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 215                                         struct sockaddr *sap, size_t salen,
 216                                         struct net *net);
 217 extern void nfs_free_server(struct nfs_server *server);
 218 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 219                                            struct nfs_fh *,
 220                                            struct nfs_fattr *,
 221                                            rpc_authflavor_t);
 222 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
 223 extern int nfs_client_init_status(const struct nfs_client *clp);
 224 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 225 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 226 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 227                                              const struct sockaddr *ds_addr,
 228                                              int ds_addrlen, int ds_proto,
 229                                              unsigned int ds_timeo,
 230                                              unsigned int ds_retrans,
 231                                              u32 minor_version);
 232 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 233                                                 struct inode *);
 234 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 235                         const struct sockaddr *ds_addr, int ds_addrlen,
 236                         int ds_proto, unsigned int ds_timeo,
 237                         unsigned int ds_retrans);
 238 #ifdef CONFIG_PROC_FS
 239 extern int __init nfs_fs_proc_init(void);
 240 extern void nfs_fs_proc_exit(void);
 241 extern int nfs_fs_proc_net_init(struct net *net);
 242 extern void nfs_fs_proc_net_exit(struct net *net);
 243 #else
 244 static inline int nfs_fs_proc_net_init(struct net *net)
 245 {
 246         return 0;
 247 }
 248 static inline void nfs_fs_proc_net_exit(struct net *net)
 249 {
 250 }
 251 static inline int nfs_fs_proc_init(void)
 252 {
 253         return 0;
 254 }
 255 static inline void nfs_fs_proc_exit(void)
 256 {
 257 }
 258 #endif
 259
 260 /* callback_xdr.c */
 261 extern const struct svc_version nfs4_callback_version1;
 262 extern const struct svc_version nfs4_callback_version4;
 263
 264 /* fs_context.c */
 265 extern struct file_system_type nfs_fs_type;
 266
 267 /* pagelist.c */
 268 extern int __init nfs_init_nfspagecache(void);
 269 extern void nfs_destroy_nfspagecache(void);
 270 extern int __init nfs_init_readpagecache(void);
 271 extern void nfs_destroy_readpagecache(void);
 272 extern int __init nfs_init_writepagecache(void);
 273 extern void nfs_destroy_writepagecache(void);
 274
 275 extern int __init nfs_init_directcache(void);
 276 extern void nfs_destroy_directcache(void);
 277 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 278                               struct nfs_pgio_header *hdr,
 279                               void (*release)(struct nfs_pgio_header *hdr));
 280 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 281 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
 282
 283 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 284 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 285 void nfs_pgio_header_free(struct nfs_pgio_header *);
 286 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 287 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 288                       const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
 289                       const struct rpc_call_ops *call_ops, int how, int flags);
 290 void nfs_free_request(struct nfs_page *req);
 291 struct nfs_pgio_mirror *
 292 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 293
 294 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 295                 const struct nfs_open_context *ctx2)
 296 {
 297         return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
 298 }
 299
 300 /* nfs2xdr.c */
 301 extern const struct rpc_procinfo nfs_procedures[];
 302 extern int nfs2_decode_dirent(struct xdr_stream *,
 303                                 struct nfs_entry *, bool);
 304
 305 /* nfs3xdr.c */
 306 extern const struct rpc_procinfo nfs3_procedures[];
 307 extern int nfs3_decode_dirent(struct xdr_stream *,
 308                                 struct nfs_entry *, bool);
 309
 310 /* nfs4xdr.c */
 311 #if IS_ENABLED(CONFIG_NFS_V4)
 312 extern int nfs4_decode_dirent(struct xdr_stream *,
 313                                 struct nfs_entry *, bool);
 314 #endif
 315 #ifdef CONFIG_NFS_V4_1
 316 extern const u32 nfs41_maxread_overhead;
 317 extern const u32 nfs41_maxwrite_overhead;
 318 extern const u32 nfs41_maxgetdevinfo_overhead;
 319 #endif
 320
 321 /* nfs4proc.c */
 322 #if IS_ENABLED(CONFIG_NFS_V4)
 323 extern const struct rpc_procinfo nfs4_procedures[];
 324 #endif
 325
 326 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 327 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 328 static inline struct nfs4_label *
 329 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 330 {
 331         if (!dst || !src)
 332                 return NULL;
 333
 334         if (src->len > NFS4_MAXLABELLEN)
 335                 return NULL;
 336
 337         dst->lfs = src->lfs;
 338         dst->pi = src->pi;
 339         dst->len = src->len;
 340         memcpy(dst->label, src->label, src->len);
 341
 342         return dst;
 343 }
 344 static inline void nfs4_label_free(struct nfs4_label *label)
 345 {
 346         if (label) {
 347                 kfree(label->label);
 348                 kfree(label);
 349         }
 350         return;
 351 }
 352
 353 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 354 {
 355         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 356                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 357 }
 358 #else
 359 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 360 static inline void nfs4_label_free(void *label) {}
 361 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 362 {
 363 }
 364 static inline struct nfs4_label *
 365 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 366 {
 367         return NULL;
 368 }
 369 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 370
 371 /* proc.c */
 372 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 373 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 374                            const struct nfs_client_initdata *);
 375
 376 /* dir.c */
 377 extern void nfs_advise_use_readdirplus(struct inode *dir);
 378 extern void nfs_force_use_readdirplus(struct inode *dir);
 379 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 380                                             struct shrink_control *sc);
 381 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 382                                            struct shrink_control *sc);
 383 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 384 int nfs_create(struct user_namespace *, struct inode *, struct dentry *,
 385                umode_t, bool);
 386 int nfs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
 387               umode_t);
 388 int nfs_rmdir(struct inode *, struct dentry *);
 389 int nfs_unlink(struct inode *, struct dentry *);
 390 int nfs_symlink(struct user_namespace *, struct inode *, struct dentry *,
 391                 const char *);
 392 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 393 int nfs_mknod(struct user_namespace *, struct inode *, struct dentry *, umode_t,
 394               dev_t);
 395 int nfs_rename(struct user_namespace *, struct inode *, struct dentry *,
 396                struct inode *, struct dentry *, unsigned int);
 397
 398 /* file.c */
 399 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 400 loff_t nfs_file_llseek(struct file *, loff_t, int);
 401 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 402 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 403 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 404 int nfs_file_release(struct inode *, struct file *);
 405 int nfs_lock(struct file *, int, struct file_lock *);
 406 int nfs_flock(struct file *, int, struct file_lock *);
 407 int nfs_check_flags(int);
 408
 409 /* inode.c */
 410 extern struct workqueue_struct *nfsiod_workqueue;
 411 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 412 extern void nfs_free_inode(struct inode *);
 413 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 414 extern int nfs_drop_inode(struct inode *);
 415 extern void nfs_clear_inode(struct inode *);
 416 extern void nfs_evict_inode(struct inode *);
 417 extern void nfs_zap_acl_cache(struct inode *inode);
 418 extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags);
 419 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
 420 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 421 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
 422
 423 /* super.c */
 424 extern const struct super_operations nfs_sops;
 425 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 426 int nfs_try_get_tree(struct fs_context *);
 427 int nfs_get_tree_common(struct fs_context *);
 428 void nfs_kill_super(struct super_block *);
 429
 430 extern struct rpc_stat nfs_rpcstat;
 431
 432 extern int __init register_nfs_fs(void);
 433 extern void __exit unregister_nfs_fs(void);
 434 extern bool nfs_sb_active(struct super_block *sb);
 435 extern void nfs_sb_deactive(struct super_block *sb);
 436 extern int nfs_client_for_each_server(struct nfs_client *clp,
 437                                       int (*fn)(struct nfs_server *, void *),
 438                                       void *data);
 439 /* io.c */
 440 extern void nfs_start_io_read(struct inode *inode);
 441 extern void nfs_end_io_read(struct inode *inode);
 442 extern void nfs_start_io_write(struct inode *inode);
 443 extern void nfs_end_io_write(struct inode *inode);
 444 extern void nfs_start_io_direct(struct inode *inode);
 445 extern void nfs_end_io_direct(struct inode *inode);
 446
 447 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
 448 {
 449         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
 450 }
 451
 452 /* namespace.c */
 453 #define NFS_PATH_CANONICAL 1
 454 extern char *nfs_path(char **p, struct dentry *dentry,
 455                       char *buffer, ssize_t buflen, unsigned flags);
 456 extern struct vfsmount *nfs_d_automount(struct path *path);
 457 int nfs_submount(struct fs_context *, struct nfs_server *);
 458 int nfs_do_submount(struct fs_context *);
 459
 460 /* getroot.c */
 461 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
 462 #if IS_ENABLED(CONFIG_NFS_V4)
 463 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 464 #endif
 465
 466 struct nfs_pgio_completion_ops;
 467 /* read.c */
 468 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 469                         struct inode *inode, bool force_mds,
 470                         const struct nfs_pgio_completion_ops *compl_ops);
 471 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 472 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 473
 474 /* super.c */
 475 void nfs_umount_begin(struct super_block *);
 476 int  nfs_statfs(struct dentry *, struct kstatfs *);
 477 int  nfs_show_options(struct seq_file *, struct dentry *);
 478 int  nfs_show_devname(struct seq_file *, struct dentry *);
 479 int  nfs_show_path(struct seq_file *, struct dentry *);
 480 int  nfs_show_stats(struct seq_file *, struct dentry *);
 481 int  nfs_reconfigure(struct fs_context *);
 482
 483 /* write.c */
 484 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 485                         struct inode *inode, int ioflags, bool force_mds,
 486                         const struct nfs_pgio_completion_ops *compl_ops);
 487 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 488 extern void nfs_commit_free(struct nfs_commit_data *p);
 489 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 490 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 491 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 492                                struct nfs_commit_data *data,
 493                                const struct nfs_rpc_ops *nfs_ops,
 494                                const struct rpc_call_ops *call_ops,
 495                                int how, int flags);
 496 extern void nfs_init_commit(struct nfs_commit_data *data,
 497                             struct list_head *head,
 498                             struct pnfs_layout_segment *lseg,
 499                             struct nfs_commit_info *cinfo);
 500 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 501                          struct nfs_commit_info *cinfo, int max);
 502 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 503 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 504                     struct nfs_commit_info *cinfo);
 505 void nfs_mark_request_commit(struct nfs_page *req,
 506                              struct pnfs_layout_segment *lseg,
 507                              struct nfs_commit_info *cinfo,
 508                              u32 ds_commit_idx);
 509 int nfs_write_need_commit(struct nfs_pgio_header *);
 510 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 511 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 512                             int how, struct nfs_commit_info *cinfo);
 513 void nfs_retry_commit(struct list_head *page_list,
 514                       struct pnfs_layout_segment *lseg,
 515                       struct nfs_commit_info *cinfo,
 516                       u32 ds_commit_idx);
 517 void nfs_commitdata_release(struct nfs_commit_data *data);
 518 void nfs_request_add_commit_list(struct nfs_page *req,
 519                                  struct nfs_commit_info *cinfo);
 520 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 521                 struct list_head *dst,
 522                 struct nfs_commit_info *cinfo);
 523 void nfs_request_remove_commit_list(struct nfs_page *req,
 524                                     struct nfs_commit_info *cinfo);
 525 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 526                     struct inode *inode,
 527                     struct nfs_direct_req *dreq);
 528 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 529 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
 530 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 531
 532 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
 533                 loff_t lstart, loff_t lend);
 534
 535 #ifdef CONFIG_NFS_V4_1
 536 static inline void
 537 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
 538                 unsigned int nbuckets)
 539 {
 540         unsigned int i;
 541
 542         for (i = 0; i < nbuckets; i++)
 543                 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
 544 }
 545 static inline
 546 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 547 {
 548         struct pnfs_commit_array *array;
 549
 550         rcu_read_lock();
 551         list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
 552                 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
 553                                 array->nbuckets);
 554         rcu_read_unlock();
 555 }
 556 #else
 557 static inline
 558 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 559 {
 560 }
 561 #endif
 562
 563 #ifdef CONFIG_MIGRATION
 564 extern int nfs_migrate_page(struct address_space *,
 565                 struct page *, struct page *, enum migrate_mode);
 566 #endif
 567
 568 static inline int
 569 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
 570                 const struct nfs_write_verifier *v2)
 571 {
 572         return memcmp(v1->data, v2->data, sizeof(v1->data));
 573 }
 574
 575 static inline bool
 576 nfs_write_match_verf(const struct nfs_writeverf *verf,
 577                 struct nfs_page *req)
 578 {
 579         return verf->committed > NFS_UNSTABLE &&
 580                 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
 581 }
 582
 583 /* unlink.c */
 584 extern struct rpc_task *
 585 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 586                  struct dentry *old_dentry, struct dentry *new_dentry,
 587                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 588 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 589
 590 /* direct.c */
 591 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 592                               struct nfs_direct_req *dreq);
 593 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 594
 595 /* nfs4proc.c */
 596 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 597                             const struct nfs_client_initdata *);
 598 extern int nfs40_walk_client_list(struct nfs_client *clp,
 599                                 struct nfs_client **result,
 600                                 const struct cred *cred);
 601 extern int nfs41_walk_client_list(struct nfs_client *clp,
 602                                 struct nfs_client **result,
 603                                 const struct cred *cred);
 604 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
 605                                 struct rpc_xprt *xprt,
 606                                 void *data);
 607
 608 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 609 {
 610         struct super_block *sb = inode->i_sb;
 611
 612         if (sb && nfs_sb_active(sb)) {
 613                 if (igrab(inode))
 614                         return inode;
 615                 nfs_sb_deactive(sb);
 616         }
 617         return NULL;
 618 }
 619
 620 static inline void nfs_iput_and_deactive(struct inode *inode)
 621 {
 622         if (inode != NULL) {
 623                 struct super_block *sb = inode->i_sb;
 624
 625                 iput(inode);
 626                 nfs_sb_deactive(sb);
 627         }
 628 }
 629
 630 /*
 631  * Determine the device name as a string
 632  */
 633 static inline char *nfs_devname(struct dentry *dentry,
 634                                 char *buffer, ssize_t buflen)
 635 {
 636         char *dummy;
 637         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 638 }
 639
 640 /*
 641  * Determine the actual block size (and log2 thereof)
 642  */
 643 static inline
 644 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 645 {
 646         /* make sure blocksize is a power of two */
 647         if ((bsize & (bsize - 1)) || nrbitsp) {
 648                 unsigned char   nrbits;
 649
 650                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 651                         ;
 652                 bsize = 1 << nrbits;
 653                 if (nrbitsp)
 654                         *nrbitsp = nrbits;
 655         }
 656
 657         return bsize;
 658 }
 659
 660 /*
 661  * Calculate the number of 512byte blocks used.
 662  */
 663 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 664 {
 665         blkcnt_t used = (tsize + 511) >> 9;
 666         return (used > ULONG_MAX) ? ULONG_MAX : used;
 667 }
 668
 669 /*
 670  * Compute and set NFS server blocksize
 671  */
 672 static inline
 673 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 674 {
 675         if (bsize < NFS_MIN_FILE_IO_SIZE)
 676                 bsize = NFS_DEF_FILE_IO_SIZE;
 677         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 678                 bsize = NFS_MAX_FILE_IO_SIZE;
 679
 680         return nfs_block_bits(bsize, nrbitsp);
 681 }
 682
 683 /*
 684  * Determine the maximum file size for a superblock
 685  */
 686 static inline
 687 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 688 {
 689         sb->s_maxbytes = (loff_t)maxfilesize;
 690         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 691                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 692 }
 693
 694 /*
 695  * Record the page as unstable (an extra writeback period) and mark its
 696  * inode as dirty.
 697  */
 698 static inline
 699 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 700 {
 701         if (!cinfo->dreq) {
 702                 struct inode *inode = page_file_mapping(page)->host;
 703
 704                 /* This page is really still in write-back - just that the
 705                  * writeback is happening on the server now.
 706                  */
 707                 inc_node_page_state(page, NR_WRITEBACK);
 708                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
 709                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 710         }
 711 }
 712
 713 /*
 714  * Determine the number of bytes of data the page contains
 715  */
 716 static inline
 717 unsigned int nfs_page_length(struct page *page)
 718 {
 719         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 720
 721         if (i_size > 0) {
 722                 pgoff_t index = page_index(page);
 723                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
 724                 if (index < end_index)
 725                         return PAGE_SIZE;
 726                 if (index == end_index)
 727                         return ((i_size - 1) & ~PAGE_MASK) + 1;
 728         }
 729         return 0;
 730 }
 731
 732 /*
 733  * Convert a umode to a dirent->d_type
 734  */
 735 static inline
 736 unsigned char nfs_umode_to_dtype(umode_t mode)
 737 {
 738         return (mode >> 12) & 15;
 739 }
 740
 741 /*
 742  * Determine the number of pages in an array of length 'len' and
 743  * with a base offset of 'base'
 744  */
 745 static inline
 746 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 747 {
 748         return ((unsigned long)len + (unsigned long)base +
 749                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 750 }
 751
 752 /*
 753  * Convert a struct timespec64 into a 64-bit change attribute
 754  *
 755  * This does approximately the same thing as timespec64_to_ns(),
 756  * but for calculation efficiency, we multiply the seconds by
 757  * 1024*1024*1024.
 758  */
 759 static inline
 760 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
 761 {
 762         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 763 }
 764
 765 #ifdef CONFIG_CRC32
 766 /**
 767  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 768  * @fh - pointer to filehandle
 769  *
 770  * returns a crc32 hash for the filehandle that is compatible with
 771  * the one displayed by "wireshark".
 772  */
 773 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 774 {
 775         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 776 }
 777 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 778 {
 779         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 780                                 NFS4_STATEID_OTHER_SIZE);
 781 }
 782 #else
 783 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 784 {
 785         return 0;
 786 }
 787 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
 788 {
 789         return 0;
 790 }
 791 #endif
 792
 793 static inline bool nfs_error_is_fatal(int err)
 794 {
 795         switch (err) {
 796         case -ERESTARTSYS:
 797         case -EINTR:
 798         case -EACCES:
 799         case -EDQUOT:
 800         case -EFBIG:
 801         case -EIO:
 802         case -ENOSPC:
 803         case -EROFS:
 804         case -ESTALE:
 805         case -E2BIG:
 806         case -ENOMEM:
 807         case -ETIMEDOUT:
 808                 return true;
 809         default:
 810                 return false;
 811         }
 812 }
 813
 814 static inline bool nfs_error_is_fatal_on_server(int err)
 815 {
 816         switch (err) {
 817         case 0:
 818         case -ERESTARTSYS:
 819         case -EINTR:
 820                 return false;
 821         }
 822         return nfs_error_is_fatal(err);
 823 }
 824
 825 /*
 826  * Select between a default port value and a user-specified port value.
 827  * If a zero value is set, then autobind will be used.
 828  */
 829 static inline void nfs_set_port(struct sockaddr *sap, int *port,
 830                                 const unsigned short default_port)
 831 {
 832         if (*port == NFS_UNSPEC_PORT)
 833                 *port = default_port;
 834
 835         rpc_set_port(sap, *port);
 836 }