LXR linux/include/linux/nfs

   1/*
   2 *  linux/include/linux/nfs_fs.h
   3 *
   4 *  Copyright (C) 1992  Rick Sladkey
   5 *
   6 *  OS-specific nfs filesystem definitions and declarations
   7 */
   8#ifndef _LINUX_NFS_FS_H
   9#define _LINUX_NFS_FS_H
  10
  11#include <uapi/linux/nfs_fs.h>
  12
  13
  14/*
  15 * Enable dprintk() debugging support for nfs client.
  16 */
  17#ifdef CONFIG_NFS_DEBUG
  18# define NFS_DEBUG
  19#endif
  20
  21#include <linux/in.h>
  22#include <linux/mm.h>
  23#include <linux/pagemap.h>
  24#include <linux/rbtree.h>
  25#include <linux/rwsem.h>
  26#include <linux/wait.h>
  27
  28#include <linux/sunrpc/debug.h>
  29#include <linux/sunrpc/auth.h>
  30#include <linux/sunrpc/clnt.h>
  31
  32#include <linux/nfs.h>
  33#include <linux/nfs2.h>
  34#include <linux/nfs3.h>
  35#include <linux/nfs4.h>
  36#include <linux/nfs_xdr.h>
  37#include <linux/nfs_fs_sb.h>
  38
  39#include <linux/mempool.h>
  40
  41/*
  42 * These are the default flags for swap requests
  43 */
  44#define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  45
  46/*
  47 * NFSv3/v4 Access mode cache entry
  48 */
  49struct nfs_access_entry {
  50        struct rb_node          rb_node;
  51        struct list_head        lru;
  52        unsigned long           jiffies;
  53        struct rpc_cred *       cred;
  54        int                     mask;
  55        struct rcu_head         rcu_head;
  56};
  57
  58struct nfs_lock_context {
  59        atomic_t count;
  60        struct list_head list;
  61        struct nfs_open_context *open_context;
  62        fl_owner_t lockowner;
  63        atomic_t io_count;
  64};
  65
  66struct nfs4_state;
  67struct nfs_open_context {
  68        struct nfs_lock_context lock_context;
  69        fl_owner_t flock_owner;
  70        struct dentry *dentry;
  71        struct rpc_cred *cred;
  72        struct nfs4_state *state;
  73        fmode_t mode;
  74
  75        unsigned long flags;
  76#define NFS_CONTEXT_ERROR_WRITE         (0)
  77#define NFS_CONTEXT_RESEND_WRITES       (1)
  78#define NFS_CONTEXT_BAD                 (2)
  79#define NFS_CONTEXT_UNLOCK      (3)
  80        int error;
  81
  82        struct list_head list;
  83        struct nfs4_threshold   *mdsthreshold;
  84};
  85
  86struct nfs_open_dir_context {
  87        struct list_head list;
  88        struct rpc_cred *cred;
  89        unsigned long attr_gencount;
  90        __u64 dir_cookie;
  91        __u64 dup_cookie;
  92        signed char duped;
  93};
  94
  95/*
  96 * NFSv4 delegation
  97 */
  98struct nfs_delegation;
  99
 100struct posix_acl;
 101
 102/*
 103 * nfs fs inode data in memory
 104 */
 105struct nfs_inode {
 106        /*
 107         * The 64bit 'inode number'
 108         */
 109        __u64 fileid;
 110
 111        /*
 112         * NFS file handle
 113         */
 114        struct nfs_fh           fh;
 115
 116        /*
 117         * Various flags
 118         */
 119        unsigned long           flags;                  /* atomic bit ops */
 120        unsigned long           cache_validity;         /* bit mask */
 121
 122        /*
 123         * read_cache_jiffies is when we started read-caching this inode.
 124         * attrtimeo is for how long the cached information is assumed
 125         * to be valid. A successful attribute revalidation doubles
 126         * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 127         * acregmin/acdirmin.
 128         *
 129         * We need to revalidate the cached attrs for this inode if
 130         *
 131         *      jiffies - read_cache_jiffies >= attrtimeo
 132         *
 133         * Please note the comparison is greater than or equal
 134         * so that zero timeout values can be specified.
 135         */
 136        unsigned long           read_cache_jiffies;
 137        unsigned long           attrtimeo;
 138        unsigned long           attrtimeo_timestamp;
 139
 140        unsigned long           attr_gencount;
 141        /* "Generation counter" for the attribute cache. This is
 142         * bumped whenever we update the metadata on the
 143         * server.
 144         */
 145        unsigned long           cache_change_attribute;
 146
 147        struct rb_root          access_cache;
 148        struct list_head        access_cache_entry_lru;
 149        struct list_head        access_cache_inode_lru;
 150#ifdef CONFIG_NFS_V3_ACL
 151        struct posix_acl        *acl_access;
 152        struct posix_acl        *acl_default;
 153#endif
 154
 155        /*
 156         * This is the cookie verifier used for NFSv3 readdir
 157         * operations
 158         */
 159        __be32                  cookieverf[2];
 160
 161        unsigned long           nrequests;
 162        struct nfs_mds_commit_info commit_info;
 163
 164        /* Open contexts for shared mmap writes */
 165        struct list_head        open_files;
 166
 167        /* Number of in-flight sillydelete RPC calls */
 168        atomic_t                silly_count;
 169        /* List of deferred sillydelete requests */
 170        struct hlist_head       silly_list;
 171        wait_queue_head_t       waitqueue;
 172
 173#if IS_ENABLED(CONFIG_NFS_V4)
 174        struct nfs4_cached_acl  *nfs4_acl;
 175        /* NFSv4 state */
 176        struct list_head        open_states;
 177        struct nfs_delegation __rcu *delegation;
 178        struct rw_semaphore     rwsem;
 179
 180        /* pNFS layout information */
 181        struct pnfs_layout_hdr *layout;
 182#endif /* CONFIG_NFS_V4*/
 183        /* how many bytes have been written/read and how many bytes queued up */
 184        __u64 write_io;
 185        __u64 read_io;
 186#ifdef CONFIG_NFS_FSCACHE
 187        struct fscache_cookie   *fscache;
 188#endif
 189        struct inode            vfs_inode;
 190};
 191
 192/*
 193 * Cache validity bit flags
 194 */
 195#define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 196#define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 197#define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 198#define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 199#define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 200#define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 201#define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 202#define NFS_INO_INVALID_LABEL   0x0080          /* cached label is invalid */
 203
 204/*
 205 * Bit offsets in flags field
 206 */
 207#define NFS_INO_ADVISE_RDPLUS   (0)             /* advise readdirplus */
 208#define NFS_INO_STALE           (1)             /* possible stale inode */
 209#define NFS_INO_ACL_LRU_SET     (2)             /* Inode is on the LRU list */
 210#define NFS_INO_INVALIDATING    (3)             /* inode is being invalidated */
 211#define NFS_INO_FLUSHING        (4)             /* inode is flushing out data */
 212#define NFS_INO_FSCACHE         (5)             /* inode can be cached by FS-Cache */
 213#define NFS_INO_FSCACHE_LOCK    (6)             /* FS-Cache cookie management lock */
 214#define NFS_INO_LAYOUTCOMMIT    (9)             /* layoutcommit required */
 215#define NFS_INO_LAYOUTCOMMITTING (10)           /* layoutcommit inflight */
 216#define NFS_INO_LAYOUTSTATS     (11)            /* layoutstats inflight */
 217
 218static inline struct nfs_inode *NFS_I(const struct inode *inode)
 219{
 220        return container_of(inode, struct nfs_inode, vfs_inode);
 221}
 222
 223static inline struct nfs_server *NFS_SB(const struct super_block *s)
 224{
 225        return (struct nfs_server *)(s->s_fs_info);
 226}
 227
 228static inline struct nfs_fh *NFS_FH(const struct inode *inode)
 229{
 230        return &NFS_I(inode)->fh;
 231}
 232
 233static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
 234{
 235        return NFS_SB(inode->i_sb);
 236}
 237
 238static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
 239{
 240        return NFS_SERVER(inode)->client;
 241}
 242
 243static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
 244{
 245        return NFS_SERVER(inode)->nfs_client->rpc_ops;
 246}
 247
 248static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
 249{
 250        struct nfs_server *nfss = NFS_SERVER(inode);
 251        return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
 252}
 253
 254static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
 255{
 256        struct nfs_server *nfss = NFS_SERVER(inode);
 257        return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
 258}
 259
 260static inline int NFS_STALE(const struct inode *inode)
 261{
 262        return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
 263}
 264
 265static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
 266{
 267#ifdef CONFIG_NFS_FSCACHE
 268        return NFS_I(inode)->fscache;
 269#else
 270        return NULL;
 271#endif
 272}
 273
 274static inline __u64 NFS_FILEID(const struct inode *inode)
 275{
 276        return NFS_I(inode)->fileid;
 277}
 278
 279static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
 280{
 281        NFS_I(inode)->fileid = fileid;
 282}
 283
 284static inline void nfs_mark_for_revalidate(struct inode *inode)
 285{
 286        struct nfs_inode *nfsi = NFS_I(inode);
 287
 288        spin_lock(&inode->i_lock);
 289        nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
 290                                NFS_INO_REVAL_PAGECACHE |
 291                                NFS_INO_INVALID_ACCESS |
 292                                NFS_INO_INVALID_ACL;
 293        if (S_ISDIR(inode->i_mode))
 294                nfsi->cache_validity |= NFS_INO_INVALID_DATA;
 295        spin_unlock(&inode->i_lock);
 296}
 297
 298static inline int nfs_server_capable(struct inode *inode, int cap)
 299{
 300        return NFS_SERVER(inode)->caps & cap;
 301}
 302
 303static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
 304{
 305        dentry->d_time = verf;
 306}
 307
 308/**
 309 * nfs_save_change_attribute - Returns the inode attribute change cookie
 310 * @dir - pointer to parent directory inode
 311 * The "change attribute" is updated every time we finish an operation
 312 * that will result in a metadata change on the server.
 313 */
 314static inline unsigned long nfs_save_change_attribute(struct inode *dir)
 315{
 316        return NFS_I(dir)->cache_change_attribute;
 317}
 318
 319/**
 320 * nfs_verify_change_attribute - Detects NFS remote directory changes
 321 * @dir - pointer to parent directory inode
 322 * @chattr - previously saved change attribute
 323 * Return "false" if the verifiers doesn't match the change attribute.
 324 * This would usually indicate that the directory contents have changed on
 325 * the server, and that any dentries need revalidating.
 326 */
 327static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
 328{
 329        return chattr == NFS_I(dir)->cache_change_attribute;
 330}
 331
 332/*
 333 * linux/fs/nfs/inode.c
 334 */
 335extern int nfs_sync_mapping(struct address_space *mapping);
 336extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 337extern void nfs_zap_caches(struct inode *);
 338extern void nfs_invalidate_atime(struct inode *);
 339extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 340                                struct nfs_fattr *, struct nfs4_label *);
 341extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 342extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 343extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 344extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
 345extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 346extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 347extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
 348extern int nfs_permission(struct inode *, int);
 349extern int nfs_open(struct inode *, struct file *);
 350extern int nfs_attribute_timeout(struct inode *inode);
 351extern int nfs_attribute_cache_expired(struct inode *inode);
 352extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 353extern int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode);
 354extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 355extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 356extern int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping);
 357extern int nfs_setattr(struct dentry *, struct iattr *);
 358extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
 359extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
 360                                struct nfs4_label *label);
 361extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 362extern void put_nfs_open_context(struct nfs_open_context *ctx);
 363extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
 364extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
 365extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
 366extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 367extern void nfs_file_clear_open_context(struct file *flip);
 368extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 369extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
 370extern u64 nfs_compat_user_ino64(u64 fileid);
 371extern void nfs_fattr_init(struct nfs_fattr *fattr);
 372extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
 373extern unsigned long nfs_inc_attr_generation_counter(void);
 374
 375extern struct nfs_fattr *nfs_alloc_fattr(void);
 376
 377static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
 378{
 379        kfree(fattr);
 380}
 381
 382extern struct nfs_fh *nfs_alloc_fhandle(void);
 383
 384static inline void nfs_free_fhandle(const struct nfs_fh *fh)
 385{
 386        kfree(fh);
 387}
 388
 389#ifdef NFS_DEBUG
 390extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
 391static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 392{
 393        return _nfs_display_fhandle_hash(fh);
 394}
 395extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
 396#define nfs_display_fhandle(fh, caption)                        \
 397        do {                                                    \
 398                if (unlikely(nfs_debug & NFSDBG_FACILITY))      \
 399                        _nfs_display_fhandle(fh, caption);      \
 400        } while (0)
 401#else
 402static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
 403{
 404        return 0;
 405}
 406static inline void nfs_display_fhandle(const struct nfs_fh *fh,
 407                                       const char *caption)
 408{
 409}
 410#endif
 411
 412/*
 413 * linux/fs/nfs/nfsroot.c
 414 */
 415extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
 416/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 417extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 418
 419/*
 420 * linux/fs/nfs/file.c
 421 */
 422extern const struct file_operations nfs_file_operations;
 423#if IS_ENABLED(CONFIG_NFS_V4)
 424extern const struct file_operations_extend nfs4_file_operations;
 425#endif /* CONFIG_NFS_V4 */
 426extern const struct address_space_operations nfs_file_aops;
 427extern const struct address_space_operations nfs_dir_aops;
 428
 429static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 430{
 431        return filp->private_data;
 432}
 433
 434static inline struct rpc_cred *nfs_file_cred(struct file *file)
 435{
 436        if (file != NULL) {
 437                struct nfs_open_context *ctx =
 438                        nfs_file_open_context(file);
 439                if (ctx)
 440                        return ctx->cred;
 441        }
 442        return NULL;
 443}
 444
 445/*
 446 * linux/fs/nfs/direct.c
 447 */
 448extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 449                        unsigned long);
 450extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 451                        const struct iovec *iov, unsigned long nr_segs,
 452                        loff_t pos, bool uio);
 453extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 454                        const struct iovec *iov, unsigned long nr_segs,
 455                        loff_t pos, bool uio);
 456
 457/*
 458 * linux/fs/nfs/dir.c
 459 */
 460extern const struct file_operations nfs_dir_operations;
 461extern const struct dentry_operations nfs_dentry_operations;
 462
 463extern void nfs_force_lookup_revalidate(struct inode *dir);
 464extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
 465                        struct nfs_fattr *fattr, struct nfs4_label *label);
 466extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
 467extern void nfs_access_zap_cache(struct inode *inode);
 468
 469/*
 470 * linux/fs/nfs/symlink.c
 471 */
 472extern const struct inode_operations nfs_symlink_inode_operations;
 473
 474/*
 475 * linux/fs/nfs/sysctl.c
 476 */
 477#ifdef CONFIG_SYSCTL
 478extern int nfs_register_sysctl(void);
 479extern void nfs_unregister_sysctl(void);
 480#else
 481#define nfs_register_sysctl() 0
 482#define nfs_unregister_sysctl() do { } while(0)
 483#endif
 484
 485/*
 486 * linux/fs/nfs/namespace.c
 487 */
 488extern const struct inode_operations nfs_mountpoint_inode_operations;
 489extern const struct inode_operations nfs_referral_inode_operations;
 490extern int nfs_mountpoint_expiry_timeout;
 491extern void nfs_release_automount_timer(void);
 492
 493/*
 494 * linux/fs/nfs/unlink.c
 495 */
 496extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 497extern void nfs_wait_on_sillyrename(struct dentry *dentry);
 498extern void nfs_block_sillyrename(struct dentry *dentry);
 499extern void nfs_unblock_sillyrename(struct dentry *dentry);
 500
 501/*
 502 * linux/fs/nfs/write.c
 503 */
 504extern int  nfs_congestion_kb;
 505extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 506extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 507extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 508extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 509
 510/*
 511 * Try to write back everything synchronously (but check the
 512 * return value!)
 513 */
 514extern int nfs_sync_inode(struct inode *inode);
 515extern int nfs_wb_all(struct inode *inode);
 516extern int nfs_wb_single_page(struct inode *inode, struct page *page, bool launder);
 517extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 518extern int  nfs_commit_inode(struct inode *, int);
 519extern struct nfs_commit_data *nfs_commitdata_alloc(void);
 520extern void nfs_commit_free(struct nfs_commit_data *data);
 521
 522static inline int
 523nfs_wb_launder_page(struct inode *inode, struct page *page)
 524{
 525        return nfs_wb_single_page(inode, page, true);
 526}
 527
 528static inline int
 529nfs_wb_page(struct inode *inode, struct page *page)
 530{
 531        return nfs_wb_single_page(inode, page, false);
 532}
 533
 534static inline int
 535nfs_have_writebacks(struct inode *inode)
 536{
 537        return NFS_I(inode)->nrequests != 0;
 538}
 539
 540/*
 541 * linux/fs/nfs/read.c
 542 */
 543extern int  nfs_readpage(struct file *, struct page *);
 544extern int  nfs_readpages(struct file *, struct address_space *,
 545                struct list_head *, unsigned);
 546extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
 547                               struct page *);
 548/*
 549 * inline functions
 550 */
 551
 552static inline loff_t nfs_size_to_loff_t(__u64 size)
 553{
 554        if (size > (__u64) OFFSET_MAX - 1)
 555                return OFFSET_MAX - 1;
 556        return (loff_t) size;
 557}
 558
 559static inline ino_t
 560nfs_fileid_to_ino_t(u64 fileid)
 561{
 562        ino_t ino = (ino_t) fileid;
 563        if (sizeof(ino_t) < sizeof(u64))
 564                ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 565        return ino;
 566}
 567
 568#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 569
 570
 571# undef ifdebug
 572# ifdef NFS_DEBUG
 573#  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 574#  define NFS_IFDEBUG(x)        x
 575# else
 576#  define ifdebug(fac)          if (0)
 577#  define NFS_IFDEBUG(x)
 578# endif
 579#endif
 580