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 static inline fmode_t flags_to_mode(int flags)
  46 {
  47         fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
  48         if ((flags & O_ACCMODE) != O_WRONLY)
  49                 res |= FMODE_READ;
  50         if ((flags & O_ACCMODE) != O_RDONLY)
  51                 res |= FMODE_WRITE;
  52         return res;
  53 }
  54
  55 /*
  56  * Note: RFC 1813 doesn't limit the number of auth flavors that
  57  * a server can return, so make something up.
  58  */
  59 #define NFS_MAX_SECFLAVORS      (12)
  60
  61 /*
  62  * Value used if the user did not specify a port value.
  63  */
  64 #define NFS_UNSPEC_PORT         (-1)
  65
  66 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
  67 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
  68
  69 struct nfs_client_initdata {
  70         unsigned long init_flags;
  71         const char *hostname;                   /* Hostname of the server */
  72         const struct sockaddr *addr;            /* Address of the server */
  73         const char *nodename;                   /* Hostname of the client */
  74         const char *ip_addr;                    /* IP address of the client */
  75         size_t addrlen;
  76         struct nfs_subversion *nfs_mod;
  77         int proto;
  78         u32 minorversion;
  79         unsigned int nconnect;
  80         unsigned int max_connect;
  81         struct net *net;
  82         const struct rpc_timeout *timeparms;
  83         const struct cred *cred;
  84 };
  85
  86 /*
  87  * In-kernel mount arguments
  88  */
  89 struct nfs_fs_context {
  90         bool                    internal;
  91         bool                    skip_reconfig_option_check;
  92         bool                    need_mount;
  93         bool                    sloppy;
  94         unsigned int            flags;          /* NFS{,4}_MOUNT_* flags */
  95         unsigned int            rsize, wsize;
  96         unsigned int            timeo, retrans;
  97         unsigned int            acregmin, acregmax;
  98         unsigned int            acdirmin, acdirmax;
  99         unsigned int            namlen;
 100         unsigned int            options;
 101         unsigned int            bsize;
 102         struct nfs_auth_info    auth_info;
 103         rpc_authflavor_t        selected_flavor;
 104         char                    *client_address;
 105         unsigned int            version;
 106         unsigned int            minorversion;
 107         char                    *fscache_uniq;
 108         unsigned short          protofamily;
 109         unsigned short          mountfamily;
 110         bool                    has_sec_mnt_opts;
 111
 112         struct {
 113                 union {
 114                         struct sockaddr address;
 115                         struct sockaddr_storage _address;
 116                 };
 117                 size_t                  addrlen;
 118                 char                    *hostname;
 119                 u32                     version;
 120                 int                     port;
 121                 unsigned short          protocol;
 122         } mount_server;
 123
 124         struct {
 125                 union {
 126                         struct sockaddr address;
 127                         struct sockaddr_storage _address;
 128                 };
 129                 size_t                  addrlen;
 130                 char                    *hostname;
 131                 char                    *export_path;
 132                 int                     port;
 133                 unsigned short          protocol;
 134                 unsigned short          nconnect;
 135                 unsigned short          max_connect;
 136                 unsigned short          export_path_len;
 137         } nfs_server;
 138
 139         struct nfs_fh           *mntfh;
 140         struct nfs_server       *server;
 141         struct nfs_subversion   *nfs_mod;
 142
 143         /* Information for a cloned mount. */
 144         struct nfs_clone_mount {
 145                 struct super_block      *sb;
 146                 struct dentry           *dentry;
 147                 struct nfs_fattr        *fattr;
 148                 unsigned int            inherited_bsize;
 149         } clone_data;
 150 };
 151
 152 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ?               \
 153         errorf(fc, fmt, ## __VA_ARGS__) :                       \
 154         ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
 155
 156 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ?         \
 157         errorf(fc, fmt, ## __VA_ARGS__) :                       \
 158         ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
 159
 160 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ?               \
 161         invalf(fc, fmt, ## __VA_ARGS__) :                       \
 162         ({ dprintk(fmt "\n", ## __VA_ARGS__);  -EINVAL; }))
 163
 164 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ?         \
 165         invalf(fc, fmt, ## __VA_ARGS__) :                       \
 166         ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__);  -EINVAL; }))
 167
 168 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ?                \
 169         warnf(fc, fmt, ## __VA_ARGS__) :                        \
 170         ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
 171
 172 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ?          \
 173         warnf(fc, fmt, ## __VA_ARGS__) :                        \
 174         ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
 175
 176 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
 177 {
 178         return fc->fs_private;
 179 }
 180
 181 /* mount_clnt.c */
 182 struct nfs_mount_request {
 183         struct sockaddr         *sap;
 184         size_t                  salen;
 185         char                    *hostname;
 186         char                    *dirpath;
 187         u32                     version;
 188         unsigned short          protocol;
 189         struct nfs_fh           *fh;
 190         int                     noresvport;
 191         unsigned int            *auth_flav_len;
 192         rpc_authflavor_t        *auth_flavs;
 193         struct net              *net;
 194 };
 195
 196 extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans);
 197 extern void nfs_umount(const struct nfs_mount_request *info);
 198
 199 /* client.c */
 200 extern const struct rpc_program nfs_program;
 201 extern void nfs_clients_init(struct net *net);
 202 extern void nfs_clients_exit(struct net *net);
 203 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 204 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
 205 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
 206 int nfs_probe_server(struct nfs_server *, struct nfs_fh *);
 207 void nfs_server_insert_lists(struct nfs_server *);
 208 void nfs_server_remove_lists(struct nfs_server *);
 209 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
 210 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 211                 rpc_authflavor_t);
 212 struct nfs_server *nfs_alloc_server(void);
 213 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 214
 215 extern void nfs_put_client(struct nfs_client *);
 216 extern void nfs_free_client(struct nfs_client *);
 217 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 218 extern struct nfs_client *
 219 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 220                                 struct nfs4_sessionid *, u32);
 221 extern struct nfs_server *nfs_create_server(struct fs_context *);
 222 extern void nfs4_server_set_init_caps(struct nfs_server *);
 223 extern struct nfs_server *nfs4_create_server(struct fs_context *);
 224 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
 225 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 226                                         struct sockaddr *sap, size_t salen,
 227                                         struct net *net);
 228 extern void nfs_free_server(struct nfs_server *server);
 229 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 230                                            struct nfs_fh *,
 231                                            struct nfs_fattr *,
 232                                            rpc_authflavor_t);
 233 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
 234 extern int nfs_client_init_status(const struct nfs_client *clp);
 235 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 236 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 237 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 238                                              const struct sockaddr *ds_addr,
 239                                              int ds_addrlen, int ds_proto,
 240                                              unsigned int ds_timeo,
 241                                              unsigned int ds_retrans,
 242                                              u32 minor_version);
 243 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 244                                                 struct inode *);
 245 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 246                         const struct sockaddr *ds_addr, int ds_addrlen,
 247                         int ds_proto, unsigned int ds_timeo,
 248                         unsigned int ds_retrans);
 249 #ifdef CONFIG_PROC_FS
 250 extern int __init nfs_fs_proc_init(void);
 251 extern void nfs_fs_proc_exit(void);
 252 extern int nfs_fs_proc_net_init(struct net *net);
 253 extern void nfs_fs_proc_net_exit(struct net *net);
 254 #else
 255 static inline int nfs_fs_proc_net_init(struct net *net)
 256 {
 257         return 0;
 258 }
 259 static inline void nfs_fs_proc_net_exit(struct net *net)
 260 {
 261 }
 262 static inline int nfs_fs_proc_init(void)
 263 {
 264         return 0;
 265 }
 266 static inline void nfs_fs_proc_exit(void)
 267 {
 268 }
 269 #endif
 270
 271 /* callback_xdr.c */
 272 extern const struct svc_version nfs4_callback_version1;
 273 extern const struct svc_version nfs4_callback_version4;
 274
 275 /* fs_context.c */
 276 extern struct file_system_type nfs_fs_type;
 277
 278 /* pagelist.c */
 279 extern int __init nfs_init_nfspagecache(void);
 280 extern void nfs_destroy_nfspagecache(void);
 281 extern int __init nfs_init_readpagecache(void);
 282 extern void nfs_destroy_readpagecache(void);
 283 extern int __init nfs_init_writepagecache(void);
 284 extern void nfs_destroy_writepagecache(void);
 285
 286 extern int __init nfs_init_directcache(void);
 287 extern void nfs_destroy_directcache(void);
 288 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 289                               struct nfs_pgio_header *hdr,
 290                               void (*release)(struct nfs_pgio_header *hdr));
 291 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 292 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
 293
 294 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 295 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 296 void nfs_pgio_header_free(struct nfs_pgio_header *);
 297 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 298 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 299                       const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
 300                       const struct rpc_call_ops *call_ops, int how, int flags);
 301 void nfs_free_request(struct nfs_page *req);
 302 struct nfs_pgio_mirror *
 303 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 304
 305 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 306                 const struct nfs_open_context *ctx2)
 307 {
 308         return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
 309 }
 310
 311 /* nfs2xdr.c */
 312 extern const struct rpc_procinfo nfs_procedures[];
 313 extern int nfs2_decode_dirent(struct xdr_stream *,
 314                                 struct nfs_entry *, bool);
 315
 316 /* nfs3xdr.c */
 317 extern const struct rpc_procinfo nfs3_procedures[];
 318 extern int nfs3_decode_dirent(struct xdr_stream *,
 319                                 struct nfs_entry *, bool);
 320
 321 /* nfs4xdr.c */
 322 #if IS_ENABLED(CONFIG_NFS_V4)
 323 extern int nfs4_decode_dirent(struct xdr_stream *,
 324                                 struct nfs_entry *, bool);
 325 #endif
 326 #ifdef CONFIG_NFS_V4_1
 327 extern const u32 nfs41_maxread_overhead;
 328 extern const u32 nfs41_maxwrite_overhead;
 329 extern const u32 nfs41_maxgetdevinfo_overhead;
 330 #endif
 331
 332 /* nfs4proc.c */
 333 #if IS_ENABLED(CONFIG_NFS_V4)
 334 extern const struct rpc_procinfo nfs4_procedures[];
 335 #endif
 336
 337 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 338 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 339 static inline struct nfs4_label *
 340 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 341 {
 342         if (!dst || !src)
 343                 return NULL;
 344
 345         if (src->len > NFS4_MAXLABELLEN)
 346                 return NULL;
 347
 348         dst->lfs = src->lfs;
 349         dst->pi = src->pi;
 350         dst->len = src->len;
 351         memcpy(dst->label, src->label, src->len);
 352
 353         return dst;
 354 }
 355
 356 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 357 {
 358         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 359                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 360 }
 361 #else
 362 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 363 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 364 {
 365 }
 366 static inline struct nfs4_label *
 367 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 368 {
 369         return NULL;
 370 }
 371 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 372
 373 /* proc.c */
 374 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 375 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 376                            const struct nfs_client_initdata *);
 377
 378 /* dir.c */
 379 extern void nfs_readdir_record_entry_cache_hit(struct inode *dir);
 380 extern void nfs_readdir_record_entry_cache_miss(struct inode *dir);
 381 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 382                                             struct shrink_control *sc);
 383 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 384                                            struct shrink_control *sc);
 385 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 386 void nfs_d_prune_case_insensitive_aliases(struct inode *inode);
 387 int nfs_create(struct user_namespace *, struct inode *, struct dentry *,
 388                umode_t, bool);
 389 int nfs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
 390               umode_t);
 391 int nfs_rmdir(struct inode *, struct dentry *);
 392 int nfs_unlink(struct inode *, struct dentry *);
 393 int nfs_symlink(struct user_namespace *, struct inode *, struct dentry *,
 394                 const char *);
 395 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 396 int nfs_mknod(struct user_namespace *, struct inode *, struct dentry *, umode_t,
 397               dev_t);
 398 int nfs_rename(struct user_namespace *, struct inode *, struct dentry *,
 399                struct inode *, struct dentry *, unsigned int);
 400
 401 #ifdef CONFIG_NFS_V4_2
 402 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server)
 403 {
 404         if (!(server->caps & NFS_CAP_XATTR))
 405                 return 0;
 406         return NFS4_ACCESS_XAREAD | NFS4_ACCESS_XAWRITE | NFS4_ACCESS_XALIST;
 407 }
 408 #else
 409 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server)
 410 {
 411         return 0;
 412 }
 413 #endif
 414
 415 /* file.c */
 416 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 417 loff_t nfs_file_llseek(struct file *, loff_t, int);
 418 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 419 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 420 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 421 int nfs_file_release(struct inode *, struct file *);
 422 int nfs_lock(struct file *, int, struct file_lock *);
 423 int nfs_flock(struct file *, int, struct file_lock *);
 424 int nfs_check_flags(int);
 425
 426 /* inode.c */
 427 extern struct workqueue_struct *nfsiod_workqueue;
 428 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 429 extern void nfs_free_inode(struct inode *);
 430 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 431 extern int nfs_drop_inode(struct inode *);
 432 extern void nfs_clear_inode(struct inode *);
 433 extern void nfs_evict_inode(struct inode *);
 434 extern void nfs_zap_acl_cache(struct inode *inode);
 435 extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags);
 436 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
 437 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 438 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
 439
 440 /* super.c */
 441 extern const struct super_operations nfs_sops;
 442 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 443 int nfs_try_get_tree(struct fs_context *);
 444 int nfs_get_tree_common(struct fs_context *);
 445 void nfs_kill_super(struct super_block *);
 446
 447 extern struct rpc_stat nfs_rpcstat;
 448
 449 extern int __init register_nfs_fs(void);
 450 extern void __exit unregister_nfs_fs(void);
 451 extern bool nfs_sb_active(struct super_block *sb);
 452 extern void nfs_sb_deactive(struct super_block *sb);
 453 extern int nfs_client_for_each_server(struct nfs_client *clp,
 454                                       int (*fn)(struct nfs_server *, void *),
 455                                       void *data);
 456 /* io.c */
 457 extern void nfs_start_io_read(struct inode *inode);
 458 extern void nfs_end_io_read(struct inode *inode);
 459 extern void nfs_start_io_write(struct inode *inode);
 460 extern void nfs_end_io_write(struct inode *inode);
 461 extern void nfs_start_io_direct(struct inode *inode);
 462 extern void nfs_end_io_direct(struct inode *inode);
 463
 464 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
 465 {
 466         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
 467 }
 468
 469 /* namespace.c */
 470 #define NFS_PATH_CANONICAL 1
 471 extern char *nfs_path(char **p, struct dentry *dentry,
 472                       char *buffer, ssize_t buflen, unsigned flags);
 473 extern struct vfsmount *nfs_d_automount(struct path *path);
 474 int nfs_submount(struct fs_context *, struct nfs_server *);
 475 int nfs_do_submount(struct fs_context *);
 476
 477 /* getroot.c */
 478 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
 479 #if IS_ENABLED(CONFIG_NFS_V4)
 480 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 481 #endif
 482
 483 struct nfs_pgio_completion_ops;
 484 /* read.c */
 485 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 486                         struct inode *inode, bool force_mds,
 487                         const struct nfs_pgio_completion_ops *compl_ops);
 488 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 489 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 490
 491 /* super.c */
 492 void nfs_umount_begin(struct super_block *);
 493 int  nfs_statfs(struct dentry *, struct kstatfs *);
 494 int  nfs_show_options(struct seq_file *, struct dentry *);
 495 int  nfs_show_devname(struct seq_file *, struct dentry *);
 496 int  nfs_show_path(struct seq_file *, struct dentry *);
 497 int  nfs_show_stats(struct seq_file *, struct dentry *);
 498 int  nfs_reconfigure(struct fs_context *);
 499
 500 /* write.c */
 501 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 502                         struct inode *inode, int ioflags, bool force_mds,
 503                         const struct nfs_pgio_completion_ops *compl_ops);
 504 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 505 extern void nfs_commit_free(struct nfs_commit_data *p);
 506 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 507 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 508 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 509                                struct nfs_commit_data *data,
 510                                const struct nfs_rpc_ops *nfs_ops,
 511                                const struct rpc_call_ops *call_ops,
 512                                int how, int flags);
 513 extern void nfs_init_commit(struct nfs_commit_data *data,
 514                             struct list_head *head,
 515                             struct pnfs_layout_segment *lseg,
 516                             struct nfs_commit_info *cinfo);
 517 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 518                          struct nfs_commit_info *cinfo, int max);
 519 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 520 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 521                     struct nfs_commit_info *cinfo);
 522 void nfs_mark_request_commit(struct nfs_page *req,
 523                              struct pnfs_layout_segment *lseg,
 524                              struct nfs_commit_info *cinfo,
 525                              u32 ds_commit_idx);
 526 int nfs_write_need_commit(struct nfs_pgio_header *);
 527 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 528 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 529                             int how, struct nfs_commit_info *cinfo);
 530 void nfs_retry_commit(struct list_head *page_list,
 531                       struct pnfs_layout_segment *lseg,
 532                       struct nfs_commit_info *cinfo,
 533                       u32 ds_commit_idx);
 534 void nfs_commitdata_release(struct nfs_commit_data *data);
 535 void nfs_request_add_commit_list(struct nfs_page *req,
 536                                  struct nfs_commit_info *cinfo);
 537 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 538                 struct list_head *dst,
 539                 struct nfs_commit_info *cinfo);
 540 void nfs_request_remove_commit_list(struct nfs_page *req,
 541                                     struct nfs_commit_info *cinfo);
 542 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 543                     struct inode *inode,
 544                     struct nfs_direct_req *dreq);
 545 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 546 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
 547 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 548
 549 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
 550                 loff_t lstart, loff_t lend);
 551
 552 #ifdef CONFIG_NFS_V4_1
 553 static inline void
 554 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
 555                 unsigned int nbuckets)
 556 {
 557         unsigned int i;
 558
 559         for (i = 0; i < nbuckets; i++)
 560                 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
 561 }
 562 static inline
 563 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 564 {
 565         struct pnfs_commit_array *array;
 566
 567         rcu_read_lock();
 568         list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
 569                 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
 570                                 array->nbuckets);
 571         rcu_read_unlock();
 572 }
 573 #else
 574 static inline
 575 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 576 {
 577 }
 578 #endif
 579
 580 #ifdef CONFIG_MIGRATION
 581 int nfs_migrate_folio(struct address_space *, struct folio *dst,
 582                 struct folio *src, enum migrate_mode);
 583 #else
 584 #define nfs_migrate_folio NULL
 585 #endif
 586
 587 static inline int
 588 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
 589                 const struct nfs_write_verifier *v2)
 590 {
 591         return memcmp(v1->data, v2->data, sizeof(v1->data));
 592 }
 593
 594 static inline bool
 595 nfs_write_match_verf(const struct nfs_writeverf *verf,
 596                 struct nfs_page *req)
 597 {
 598         return verf->committed > NFS_UNSTABLE &&
 599                 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
 600 }
 601
 602 static inline gfp_t nfs_io_gfp_mask(void)
 603 {
 604         if (current->flags & PF_WQ_WORKER)
 605                 return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
 606         return GFP_KERNEL;
 607 }
 608
 609 /* unlink.c */
 610 extern struct rpc_task *
 611 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 612                  struct dentry *old_dentry, struct dentry *new_dentry,
 613                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 614 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 615
 616 /* direct.c */
 617 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 618                               struct nfs_direct_req *dreq);
 619 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 620
 621 /* nfs4proc.c */
 622 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 623                             const struct nfs_client_initdata *);
 624 extern int nfs40_walk_client_list(struct nfs_client *clp,
 625                                 struct nfs_client **result,
 626                                 const struct cred *cred);
 627 extern int nfs41_walk_client_list(struct nfs_client *clp,
 628                                 struct nfs_client **result,
 629                                 const struct cred *cred);
 630 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
 631                                 struct rpc_xprt *xprt,
 632                                 void *data);
 633
 634 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 635 {
 636         struct super_block *sb = inode->i_sb;
 637
 638         if (sb && nfs_sb_active(sb)) {
 639                 if (igrab(inode))
 640                         return inode;
 641                 nfs_sb_deactive(sb);
 642         }
 643         return NULL;
 644 }
 645
 646 static inline void nfs_iput_and_deactive(struct inode *inode)
 647 {
 648         if (inode != NULL) {
 649                 struct super_block *sb = inode->i_sb;
 650
 651                 iput(inode);
 652                 nfs_sb_deactive(sb);
 653         }
 654 }
 655
 656 /*
 657  * Determine the device name as a string
 658  */
 659 static inline char *nfs_devname(struct dentry *dentry,
 660                                 char *buffer, ssize_t buflen)
 661 {
 662         char *dummy;
 663         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 664 }
 665
 666 /*
 667  * Determine the actual block size (and log2 thereof)
 668  */
 669 static inline
 670 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 671 {
 672         /* make sure blocksize is a power of two */
 673         if ((bsize & (bsize - 1)) || nrbitsp) {
 674                 unsigned char   nrbits;
 675
 676                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 677                         ;
 678                 bsize = 1 << nrbits;
 679                 if (nrbitsp)
 680                         *nrbitsp = nrbits;
 681         }
 682
 683         return bsize;
 684 }
 685
 686 /*
 687  * Calculate the number of 512byte blocks used.
 688  */
 689 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 690 {
 691         blkcnt_t used = (tsize + 511) >> 9;
 692         return (used > ULONG_MAX) ? ULONG_MAX : used;
 693 }
 694
 695 /*
 696  * Compute and set NFS server blocksize
 697  */
 698 static inline
 699 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 700 {
 701         if (bsize < NFS_MIN_FILE_IO_SIZE)
 702                 bsize = NFS_DEF_FILE_IO_SIZE;
 703         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 704                 bsize = NFS_MAX_FILE_IO_SIZE;
 705
 706         return nfs_block_bits(bsize, nrbitsp);
 707 }
 708
 709 /*
 710  * Compute and set NFS server rsize / wsize
 711  */
 712 static inline
 713 unsigned long nfs_io_size(unsigned long iosize, enum xprt_transports proto)
 714 {
 715         if (iosize < NFS_MIN_FILE_IO_SIZE)
 716                 iosize = NFS_DEF_FILE_IO_SIZE;
 717         else if (iosize >= NFS_MAX_FILE_IO_SIZE)
 718                 iosize = NFS_MAX_FILE_IO_SIZE;
 719         else
 720                 iosize = iosize & PAGE_MASK;
 721
 722         if (proto == XPRT_TRANSPORT_UDP)
 723                 return nfs_block_bits(iosize, NULL);
 724         return iosize;
 725 }
 726
 727 /*
 728  * Determine the maximum file size for a superblock
 729  */
 730 static inline
 731 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 732 {
 733         sb->s_maxbytes = (loff_t)maxfilesize;
 734         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 735                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 736 }
 737
 738 /*
 739  * Record the page as unstable (an extra writeback period) and mark its
 740  * inode as dirty.
 741  */
 742 static inline
 743 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 744 {
 745         if (!cinfo->dreq) {
 746                 struct inode *inode = page_file_mapping(page)->host;
 747
 748                 /* This page is really still in write-back - just that the
 749                  * writeback is happening on the server now.
 750                  */
 751                 inc_node_page_state(page, NR_WRITEBACK);
 752                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
 753                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 754         }
 755 }
 756
 757 /*
 758  * Determine the number of bytes of data the page contains
 759  */
 760 static inline
 761 unsigned int nfs_page_length(struct page *page)
 762 {
 763         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 764
 765         if (i_size > 0) {
 766                 pgoff_t index = page_index(page);
 767                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
 768                 if (index < end_index)
 769                         return PAGE_SIZE;
 770                 if (index == end_index)
 771                         return ((i_size - 1) & ~PAGE_MASK) + 1;
 772         }
 773         return 0;
 774 }
 775
 776 /*
 777  * Convert a umode to a dirent->d_type
 778  */
 779 static inline
 780 unsigned char nfs_umode_to_dtype(umode_t mode)
 781 {
 782         return (mode >> 12) & 15;
 783 }
 784
 785 /*
 786  * Determine the number of pages in an array of length 'len' and
 787  * with a base offset of 'base'
 788  */
 789 static inline
 790 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 791 {
 792         return ((unsigned long)len + (unsigned long)base +
 793                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 794 }
 795
 796 /*
 797  * Convert a struct timespec64 into a 64-bit change attribute
 798  *
 799  * This does approximately the same thing as timespec64_to_ns(),
 800  * but for calculation efficiency, we multiply the seconds by
 801  * 1024*1024*1024.
 802  */
 803 static inline
 804 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
 805 {
 806         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 807 }
 808
 809 #ifdef CONFIG_CRC32
 810 /**
 811  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 812  * @fh - pointer to filehandle
 813  *
 814  * returns a crc32 hash for the filehandle that is compatible with
 815  * the one displayed by "wireshark".
 816  */
 817 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 818 {
 819         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 820 }
 821 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 822 {
 823         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 824                                 NFS4_STATEID_OTHER_SIZE);
 825 }
 826 #else
 827 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 828 {
 829         return 0;
 830 }
 831 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
 832 {
 833         return 0;
 834 }
 835 #endif
 836
 837 static inline bool nfs_error_is_fatal(int err)
 838 {
 839         switch (err) {
 840         case -ERESTARTSYS:
 841         case -EINTR:
 842         case -EACCES:
 843         case -EDQUOT:
 844         case -EFBIG:
 845         case -EIO:
 846         case -ENOSPC:
 847         case -EROFS:
 848         case -ESTALE:
 849         case -E2BIG:
 850         case -ENOMEM:
 851         case -ETIMEDOUT:
 852                 return true;
 853         default:
 854                 return false;
 855         }
 856 }
 857
 858 static inline bool nfs_error_is_fatal_on_server(int err)
 859 {
 860         switch (err) {
 861         case 0:
 862         case -ERESTARTSYS:
 863         case -EINTR:
 864         case -ENOMEM:
 865                 return false;
 866         }
 867         return nfs_error_is_fatal(err);
 868 }
 869
 870 /*
 871  * Select between a default port value and a user-specified port value.
 872  * If a zero value is set, then autobind will be used.
 873  */
 874 static inline void nfs_set_port(struct sockaddr *sap, int *port,
 875                                 const unsigned short default_port)
 876 {
 877         if (*port == NFS_UNSPEC_PORT)
 878                 *port = default_port;
 879
 880         rpc_set_port(sap, *port);
 881 }
 882
 883 struct nfs_direct_req {
 884         struct kref             kref;           /* release manager */
 885
 886         /* I/O parameters */
 887         struct nfs_open_context *ctx;           /* file open context info */
 888         struct nfs_lock_context *l_ctx;         /* Lock context info */
 889         struct kiocb *          iocb;           /* controlling i/o request */
 890         struct inode *          inode;          /* target file of i/o */
 891
 892         /* completion state */
 893         atomic_t                io_count;       /* i/os we're waiting for */
 894         spinlock_t              lock;           /* protect completion state */
 895
 896         loff_t                  io_start;       /* Start offset for I/O */
 897         ssize_t                 count,          /* bytes actually processed */
 898                                 max_count,      /* max expected count */
 899                                 bytes_left,     /* bytes left to be sent */
 900                                 error;          /* any reported error */
 901         struct completion       completion;     /* wait for i/o completion */
 902
 903         /* commit state */
 904         struct nfs_mds_commit_info mds_cinfo;   /* Storage for cinfo */
 905         struct pnfs_ds_commit_info ds_cinfo;    /* Storage for cinfo */
 906         struct work_struct      work;
 907         int                     flags;
 908         /* for write */
 909 #define NFS_ODIRECT_DO_COMMIT           (1)     /* an unstable reply was received */
 910 #define NFS_ODIRECT_RESCHED_WRITES      (2)     /* write verification failed */
 911         /* for read */
 912 #define NFS_ODIRECT_SHOULD_DIRTY        (3)     /* dirty user-space page after read */
 913 #define NFS_ODIRECT_DONE                INT_MAX /* write verification failed */
 914 };