include/linux/nfs_fs.h

   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
   9 #ifndef _LINUX_NFS_FS_H
  10 #define _LINUX_NFS_FS_H
  11
  12 #include <linux/magic.h>
  13
  14 /* Default timeout values */
  15 #define NFS_MAX_UDP_TIMEOUT     (60*HZ)
  16 #define NFS_MAX_TCP_TIMEOUT     (600*HZ)
  17
  18 /*
  19  * When flushing a cluster of dirty pages, there can be different
  20  * strategies:
  21  */
  22 #define FLUSH_SYNC              1       /* file being synced, or contention */
  23 #define FLUSH_STABLE            4       /* commit to stable storage */
  24 #define FLUSH_LOWPRI            8       /* low priority background flush */
  25 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  26 #define FLUSH_NOCOMMIT          32      /* Don't send the NFSv3/v4 COMMIT */
  27 #define FLUSH_INVALIDATE        64      /* Invalidate the page cache */
  28 #define FLUSH_NOWRITEPAGE       128     /* Don't call writepage() */
  29
  30 #ifdef __KERNEL__
  31
  32 #include <linux/in.h>
  33 #include <linux/kref.h>
  34 #include <linux/mm.h>
  35 #include <linux/namei.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/rbtree.h>
  38 #include <linux/rwsem.h>
  39 #include <linux/wait.h>
  40
  41 #include <linux/sunrpc/debug.h>
  42 #include <linux/sunrpc/auth.h>
  43 #include <linux/sunrpc/clnt.h>
  44
  45 #include <linux/nfs.h>
  46 #include <linux/nfs2.h>
  47 #include <linux/nfs3.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_xdr.h>
  50
  51 #include <linux/nfs_fs_sb.h>
  52
  53 #include <linux/rwsem.h>
  54 #include <linux/mempool.h>
  55
  56 /*
  57  * These are the default flags for swap requests
  58  */
  59 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  60
  61 /*
  62  * NFSv3/v4 Access mode cache entry
  63  */
  64 struct nfs_access_entry {
  65         struct rb_node          rb_node;
  66         struct list_head        lru;
  67         unsigned long           jiffies;
  68         struct rpc_cred *       cred;
  69         int                     mask;
  70 };
  71
  72 struct nfs4_state;
  73 struct nfs_open_context {
  74         atomic_t count;
  75         struct path path;
  76         struct rpc_cred *cred;
  77         struct nfs4_state *state;
  78         fl_owner_t lockowner;
  79         int mode;
  80
  81         unsigned long flags;
  82 #define NFS_CONTEXT_ERROR_WRITE         (0)
  83         int error;
  84
  85         struct list_head list;
  86
  87         __u64 dir_cookie;
  88 };
  89
  90 /*
  91  * NFSv4 delegation
  92  */
  93 struct nfs_delegation;
  94
  95 struct posix_acl;
  96
  97 /*
  98  * nfs fs inode data in memory
  99  */
 100 struct nfs_inode {
 101         /*
 102          * The 64bit 'inode number'
 103          */
 104         __u64 fileid;
 105
 106         /*
 107          * NFS file handle
 108          */
 109         struct nfs_fh           fh;
 110
 111         /*
 112          * Various flags
 113          */
 114         unsigned long           flags;                  /* atomic bit ops */
 115         unsigned long           cache_validity;         /* bit mask */
 116
 117         /*
 118          * read_cache_jiffies is when we started read-caching this inode.
 119          * attrtimeo is for how long the cached information is assumed
 120          * to be valid. A successful attribute revalidation doubles
 121          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 122          * acregmin/acdirmin.
 123          *
 124          * We need to revalidate the cached attrs for this inode if
 125          *
 126          *      jiffies - read_cache_jiffies > attrtimeo
 127          */
 128         unsigned long           read_cache_jiffies;
 129         unsigned long           attrtimeo;
 130         unsigned long           attrtimeo_timestamp;
 131         __u64                   change_attr;            /* v4 only */
 132
 133         unsigned long           last_updated;
 134         /* "Generation counter" for the attribute cache. This is
 135          * bumped whenever we update the metadata on the
 136          * server.
 137          */
 138         unsigned long           cache_change_attribute;
 139         /*
 140          * Counter indicating the number of outstanding requests that
 141          * will cause a file data update.
 142          */
 143         atomic_t                data_updates;
 144
 145         struct rb_root          access_cache;
 146         struct list_head        access_cache_entry_lru;
 147         struct list_head        access_cache_inode_lru;
 148 #ifdef CONFIG_NFS_V3_ACL
 149         struct posix_acl        *acl_access;
 150         struct posix_acl        *acl_default;
 151 #endif
 152
 153         /*
 154          * This is the cookie verifier used for NFSv3 readdir
 155          * operations
 156          */
 157         __be32                  cookieverf[2];
 158
 159         /*
 160          * This is the list of dirty unwritten pages.
 161          */
 162         struct radix_tree_root  nfs_page_tree;
 163
 164         unsigned long           ncommit,
 165                                 npages;
 166
 167         /* Open contexts for shared mmap writes */
 168         struct list_head        open_files;
 169
 170 #ifdef CONFIG_NFS_V4
 171         struct nfs4_cached_acl  *nfs4_acl;
 172         /* NFSv4 state */
 173         struct list_head        open_states;
 174         struct nfs_delegation   *delegation;
 175         int                      delegation_state;
 176         struct rw_semaphore     rwsem;
 177 #endif /* CONFIG_NFS_V4*/
 178         struct inode            vfs_inode;
 179 };
 180
 181 /*
 182  * Cache validity bit flags
 183  */
 184 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 185 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 186 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 187 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 188 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 189 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 190 #define NFS_INO_REVAL_FORCED    0x0040          /* force revalidation ignoring a delegation */
 191
 192 /*
 193  * Bit offsets in flags field
 194  */
 195 #define NFS_INO_REVALIDATING    (0)             /* revalidating attrs */
 196 #define NFS_INO_ADVISE_RDPLUS   (1)             /* advise readdirplus */
 197 #define NFS_INO_STALE           (2)             /* possible stale inode */
 198 #define NFS_INO_ACL_LRU_SET     (3)             /* Inode is on the LRU list */
 199
 200 static inline struct nfs_inode *NFS_I(struct inode *inode)
 201 {
 202         return container_of(inode, struct nfs_inode, vfs_inode);
 203 }
 204 #define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))
 205
 206 #define NFS_FH(inode)                   (&NFS_I(inode)->fh)
 207 #define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
 208 #define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
 209 #define NFS_PROTO(inode)                (NFS_SERVER(inode)->nfs_client->rpc_ops)
 210 #define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
 211 #define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
 212 #define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
 213 #define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
 214 #define NFS_MINATTRTIMEO(inode) \
 215         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 216                                : NFS_SERVER(inode)->acregmin)
 217 #define NFS_MAXATTRTIMEO(inode) \
 218         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 219                                : NFS_SERVER(inode)->acregmax)
 220 #define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)
 221
 222 #define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
 223 #define NFS_STALE(inode)                (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
 224
 225 #define NFS_FILEID(inode)               (NFS_I(inode)->fileid)
 226
 227 static inline int nfs_caches_unstable(struct inode *inode)
 228 {
 229         return atomic_read(&NFS_I(inode)->data_updates) != 0;
 230 }
 231
 232 static inline void nfs_mark_for_revalidate(struct inode *inode)
 233 {
 234         struct nfs_inode *nfsi = NFS_I(inode);
 235
 236         spin_lock(&inode->i_lock);
 237         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
 238         if (S_ISDIR(inode->i_mode))
 239                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 240         spin_unlock(&inode->i_lock);
 241 }
 242
 243 static inline void NFS_CACHEINV(struct inode *inode)
 244 {
 245         if (!nfs_caches_unstable(inode))
 246                 nfs_mark_for_revalidate(inode);
 247 }
 248
 249 static inline int nfs_server_capable(struct inode *inode, int cap)
 250 {
 251         return NFS_SERVER(inode)->caps & cap;
 252 }
 253
 254 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 255 {
 256         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
 257 }
 258
 259 /**
 260  * nfs_save_change_attribute - Returns the inode attribute change cookie
 261  * @inode - pointer to inode
 262  * The "change attribute" is updated every time we finish an operation
 263  * that will result in a metadata change on the server.
 264  */
 265 static inline long nfs_save_change_attribute(struct inode *inode)
 266 {
 267         return NFS_I(inode)->cache_change_attribute;
 268 }
 269
 270 /**
 271  * nfs_verify_change_attribute - Detects NFS inode cache updates
 272  * @inode - pointer to inode
 273  * @chattr - previously saved change attribute
 274  * Return "false" if metadata has been updated (or is in the process of
 275  * being updated) since the change attribute was saved.
 276  */
 277 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 278 {
 279         return !nfs_caches_unstable(inode)
 280                 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
 281 }
 282
 283 /*
 284  * linux/fs/nfs/inode.c
 285  */
 286 extern int nfs_sync_mapping(struct address_space *mapping);
 287 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 288 extern void nfs_zap_caches(struct inode *);
 289 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 290                                 struct nfs_fattr *);
 291 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 292 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 293 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 294 extern int nfs_permission(struct inode *, int, struct nameidata *);
 295 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
 296 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 297 extern void nfs_access_zap_cache(struct inode *inode);
 298 extern int nfs_open(struct inode *, struct file *);
 299 extern int nfs_release(struct inode *, struct file *);
 300 extern int nfs_attribute_timeout(struct inode *inode);
 301 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 302 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 303 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 304 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
 305 extern int nfs_setattr(struct dentry *, struct iattr *);
 306 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 307 extern void nfs_begin_attr_update(struct inode *);
 308 extern void nfs_end_attr_update(struct inode *);
 309 extern void nfs_begin_data_update(struct inode *);
 310 extern void nfs_end_data_update(struct inode *);
 311 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 312 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 313 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
 314
 315 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 316 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
 317
 318 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
 319 {
 320         fattr->valid = 0;
 321         fattr->time_start = jiffies;
 322 }
 323
 324 /*
 325  * linux/fs/nfs/file.c
 326  */
 327 extern const struct inode_operations nfs_file_inode_operations;
 328 #ifdef CONFIG_NFS_V3
 329 extern const struct inode_operations nfs3_file_inode_operations;
 330 #endif /* CONFIG_NFS_V3 */
 331 extern const struct file_operations nfs_file_operations;
 332 extern const struct address_space_operations nfs_file_aops;
 333
 334 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 335 {
 336         return filp->private_data;
 337 }
 338
 339 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 340 {
 341         if (file != NULL) {
 342                 struct nfs_open_context *ctx;
 343
 344                 ctx = (struct nfs_open_context*)file->private_data;
 345                 return ctx->cred;
 346         }
 347         return NULL;
 348 }
 349
 350 /*
 351  * linux/fs/nfs/xattr.c
 352  */
 353 #ifdef CONFIG_NFS_V3_ACL
 354 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 355 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 356 extern int nfs3_setxattr(struct dentry *, const char *,
 357                         const void *, size_t, int);
 358 extern int nfs3_removexattr (struct dentry *, const char *name);
 359 #else
 360 # define nfs3_listxattr NULL
 361 # define nfs3_getxattr NULL
 362 # define nfs3_setxattr NULL
 363 # define nfs3_removexattr NULL
 364 #endif
 365
 366 /*
 367  * linux/fs/nfs/direct.c
 368  */
 369 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 370                         unsigned long);
 371 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
 372                         const struct iovec *iov, unsigned long nr_segs,
 373                         loff_t pos);
 374 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
 375                         const struct iovec *iov, unsigned long nr_segs,
 376                         loff_t pos);
 377
 378 /*
 379  * linux/fs/nfs/dir.c
 380  */
 381 extern const struct inode_operations nfs_dir_inode_operations;
 382 #ifdef CONFIG_NFS_V3
 383 extern const struct inode_operations nfs3_dir_inode_operations;
 384 #endif /* CONFIG_NFS_V3 */
 385 extern const struct file_operations nfs_dir_operations;
 386 extern struct dentry_operations nfs_dentry_operations;
 387
 388 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 389
 390 /*
 391  * linux/fs/nfs/symlink.c
 392  */
 393 extern const struct inode_operations nfs_symlink_inode_operations;
 394
 395 /*
 396  * linux/fs/nfs/sysctl.c
 397  */
 398 #ifdef CONFIG_SYSCTL
 399 extern int nfs_register_sysctl(void);
 400 extern void nfs_unregister_sysctl(void);
 401 #else
 402 #define nfs_register_sysctl() 0
 403 #define nfs_unregister_sysctl() do { } while(0)
 404 #endif
 405
 406 /*
 407  * linux/fs/nfs/namespace.c
 408  */
 409 extern struct list_head nfs_automount_list;
 410 extern const struct inode_operations nfs_mountpoint_inode_operations;
 411 extern const struct inode_operations nfs_referral_inode_operations;
 412 extern int nfs_mountpoint_expiry_timeout;
 413 extern void nfs_release_automount_timer(void);
 414
 415 /*
 416  * linux/fs/nfs/unlink.c
 417  */
 418 extern int  nfs_async_unlink(struct inode *dir, struct dentry *dentry);
 419 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
 420
 421 /*
 422  * linux/fs/nfs/write.c
 423  */
 424 extern int  nfs_congestion_kb;
 425 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 426 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 427 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 428 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 429 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
 430 extern void nfs_writedata_release(void *);
 431
 432 /*
 433  * Try to write back everything synchronously (but check the
 434  * return value!)
 435  */
 436 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
 437 extern int nfs_wb_all(struct inode *inode);
 438 extern int nfs_wb_nocommit(struct inode *inode);
 439 extern int nfs_wb_page(struct inode *inode, struct page* page);
 440 extern int nfs_wb_page_priority(struct inode *inode, struct page* page, int how);
 441 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
 442 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 443 extern int  nfs_commit_inode(struct inode *, int);
 444 extern struct nfs_write_data *nfs_commit_alloc(void);
 445 extern void nfs_commit_free(struct nfs_write_data *wdata);
 446 extern void nfs_commit_release(void *wdata);
 447 #else
 448 static inline int
 449 nfs_commit_inode(struct inode *inode, int how)
 450 {
 451         return 0;
 452 }
 453 #endif
 454
 455 static inline int
 456 nfs_have_writebacks(struct inode *inode)
 457 {
 458         return NFS_I(inode)->npages != 0;
 459 }
 460
 461 /*
 462  * Allocate nfs_write_data structures
 463  */
 464 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 465
 466 /*
 467  * linux/fs/nfs/read.c
 468  */
 469 extern int  nfs_readpage(struct file *, struct page *);
 470 extern int  nfs_readpages(struct file *, struct address_space *,
 471                 struct list_head *, unsigned);
 472 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
 473 extern void nfs_readdata_release(void *data);
 474
 475 /*
 476  * Allocate nfs_read_data structures
 477  */
 478 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 479
 480 /*
 481  * linux/fs/nfs3proc.c
 482  */
 483 #ifdef CONFIG_NFS_V3_ACL
 484 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 485 extern int nfs3_proc_setacl(struct inode *inode, int type,
 486                             struct posix_acl *acl);
 487 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 488                 mode_t mode);
 489 extern void nfs3_forget_cached_acls(struct inode *inode);
 490 #else
 491 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 492                                             struct inode *inode,
 493                                             mode_t mode)
 494 {
 495         return 0;
 496 }
 497
 498 static inline void nfs3_forget_cached_acls(struct inode *inode)
 499 {
 500 }
 501 #endif /* CONFIG_NFS_V3_ACL */
 502
 503 /*
 504  * linux/fs/mount_clnt.c
 505  */
 506 extern int  nfs_mount(struct sockaddr *, size_t, char *, char *,
 507                       int, int, struct nfs_fh *);
 508
 509 /*
 510  * inline functions
 511  */
 512
 513 static inline loff_t nfs_size_to_loff_t(__u64 size)
 514 {
 515         if (size > (__u64) OFFSET_MAX - 1)
 516                 return OFFSET_MAX - 1;
 517         return (loff_t) size;
 518 }
 519
 520 static inline ino_t
 521 nfs_fileid_to_ino_t(u64 fileid)
 522 {
 523         ino_t ino = (ino_t) fileid;
 524         if (sizeof(ino_t) < sizeof(u64))
 525                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 526         return ino;
 527 }
 528
 529 /* NFS root */
 530
 531 extern void * nfs_root_data(void);
 532
 533 #define nfs_wait_event(clnt, wq, condition)                             \
 534 ({                                                                      \
 535         int __retval = 0;                                               \
 536         if (clnt->cl_intr) {                                            \
 537                 sigset_t oldmask;                                       \
 538                 rpc_clnt_sigmask(clnt, &oldmask);                       \
 539                 __retval = wait_event_interruptible(wq, condition);     \
 540                 rpc_clnt_sigunmask(clnt, &oldmask);                     \
 541         } else                                                          \
 542                 wait_event(wq, condition);                              \
 543         __retval;                                                       \
 544 })
 545
 546 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 547
 548 #endif /* __KERNEL__ */
 549
 550 /*
 551  * NFS debug flags
 552  */
 553 #define NFSDBG_VFS              0x0001
 554 #define NFSDBG_DIRCACHE         0x0002
 555 #define NFSDBG_LOOKUPCACHE      0x0004
 556 #define NFSDBG_PAGECACHE        0x0008
 557 #define NFSDBG_PROC             0x0010
 558 #define NFSDBG_XDR              0x0020
 559 #define NFSDBG_FILE             0x0040
 560 #define NFSDBG_ROOT             0x0080
 561 #define NFSDBG_CALLBACK         0x0100
 562 #define NFSDBG_CLIENT           0x0200
 563 #define NFSDBG_MOUNT            0x0400
 564 #define NFSDBG_ALL              0xFFFF
 565
 566 #ifdef __KERNEL__
 567
 568 /*
 569  * Enable debugging support for nfs client.
 570  * Requires RPC_DEBUG.
 571  */
 572 #ifdef RPC_DEBUG
 573 # define NFS_DEBUG
 574 #endif
 575
 576 # undef ifdebug
 577 # ifdef NFS_DEBUG
 578 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 579 # else
 580 #  define ifdebug(fac)          if (0)
 581 # endif
 582 #endif /* __KERNEL */
 583
 584 #endif