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/config.h>
  13 #include <linux/in.h>
  14 #include <linux/mm.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/rwsem.h>
  17 #include <linux/wait.h>
  18
  19 #include <linux/nfs_fs_sb.h>
  20
  21 #include <linux/sunrpc/debug.h>
  22 #include <linux/sunrpc/auth.h>
  23 #include <linux/sunrpc/clnt.h>
  24
  25 #include <linux/nfs.h>
  26 #include <linux/nfs2.h>
  27 #include <linux/nfs3.h>
  28 #include <linux/nfs4.h>
  29 #include <linux/nfs_xdr.h>
  30 #include <linux/rwsem.h>
  31 #include <linux/mempool.h>
  32
  33 /*
  34  * Enable debugging support for nfs client.
  35  * Requires RPC_DEBUG.
  36  */
  37 #ifdef RPC_DEBUG
  38 # define NFS_DEBUG
  39 #endif
  40
  41 #define NFS_MAX_FILE_IO_BUFFER_SIZE     32768
  42 #define NFS_DEF_FILE_IO_BUFFER_SIZE     4096
  43
  44 /*
  45  * superblock magic number for NFS
  46  */
  47 #define NFS_SUPER_MAGIC                 0x6969
  48
  49 /*
  50  * These are the default flags for swap requests
  51  */
  52 #define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
  53
  54 /*
  55  * When flushing a cluster of dirty pages, there can be different
  56  * strategies:
  57  */
  58 #define FLUSH_AGING             0       /* only flush old buffers */
  59 #define FLUSH_SYNC              1       /* file being synced, or contention */
  60 #define FLUSH_WAIT              2       /* wait for completion */
  61 #define FLUSH_STABLE            4       /* commit to stable storage */
  62 #define FLUSH_LOWPRI            8       /* low priority background flush */
  63 #define FLUSH_HIGHPRI           16      /* high priority memory reclaim flush */
  64
  65 #ifdef __KERNEL__
  66
  67 /*
  68  * NFSv3/v4 Access mode cache entry
  69  */
  70 struct nfs_access_entry {
  71         unsigned long           jiffies;
  72         struct rpc_cred *       cred;
  73         int                     mask;
  74 };
  75
  76 struct nfs4_state;
  77 struct nfs_open_context {
  78         atomic_t count;
  79         struct dentry *dentry;
  80         struct rpc_cred *cred;
  81         struct nfs4_state *state;
  82         fl_owner_t lockowner;
  83         int mode;
  84         int error;
  85
  86         struct list_head list;
  87
  88         __u64 dir_cookie;
  89 };
  90
  91 /*
  92  * NFSv4 delegation
  93  */
  94 struct nfs_delegation;
  95
  96 struct posix_acl;
  97
  98 /*
  99  * nfs fs inode data in memory
 100  */
 101 struct nfs_inode {
 102         /*
 103          * The 64bit 'inode number'
 104          */
 105         __u64 fileid;
 106
 107         /*
 108          * NFS file handle
 109          */
 110         struct nfs_fh           fh;
 111
 112         /*
 113          * Various flags
 114          */
 115         unsigned long           flags;                  /* atomic bit ops */
 116         unsigned long           cache_validity;         /* bit mask */
 117
 118         /*
 119          * read_cache_jiffies is when we started read-caching this inode,
 120          * and read_cache_mtime is the mtime of the inode at that time.
 121          * attrtimeo is for how long the cached information is assumed
 122          * to be valid. A successful attribute revalidation doubles
 123          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 124          * acregmin/acdirmin.
 125          *
 126          * We need to revalidate the cached attrs for this inode if
 127          *
 128          *      jiffies - read_cache_jiffies > attrtimeo
 129          *
 130          * and invalidate any cached data/flush out any dirty pages if
 131          * we find that
 132          *
 133          *      mtime != read_cache_mtime
 134          */
 135         unsigned long           read_cache_jiffies;
 136         unsigned long           attrtimeo;
 137         unsigned long           attrtimeo_timestamp;
 138         __u64                   change_attr;            /* v4 only */
 139
 140         /* "Generation counter" for the attribute cache. This is
 141          * bumped whenever we update the metadata on the
 142          * server.
 143          */
 144         unsigned long           cache_change_attribute;
 145         /*
 146          * Counter indicating the number of outstanding requests that
 147          * will cause a file data update.
 148          */
 149         atomic_t                data_updates;
 150
 151         struct nfs_access_entry cache_access;
 152 #ifdef CONFIG_NFS_V3_ACL
 153         struct posix_acl        *acl_access;
 154         struct posix_acl        *acl_default;
 155 #endif
 156
 157         /*
 158          * This is the cookie verifier used for NFSv3 readdir
 159          * operations
 160          */
 161         __u32                   cookieverf[2];
 162
 163         /*
 164          * This is the list of dirty unwritten pages.
 165          */
 166         spinlock_t              req_lock;
 167         struct list_head        dirty;
 168         struct list_head        commit;
 169         struct radix_tree_root  nfs_page_tree;
 170
 171         unsigned int            ndirty,
 172                                 ncommit,
 173                                 npages;
 174
 175         /* Open contexts for shared mmap writes */
 176         struct list_head        open_files;
 177
 178 #ifdef CONFIG_NFS_V4
 179         struct nfs4_cached_acl  *nfs4_acl;
 180         /* NFSv4 state */
 181         struct list_head        open_states;
 182         struct nfs_delegation   *delegation;
 183         int                      delegation_state;
 184         struct rw_semaphore     rwsem;
 185 #endif /* CONFIG_NFS_V4*/
 186         struct inode            vfs_inode;
 187 };
 188
 189 /*
 190  * Cache validity bit flags
 191  */
 192 #define NFS_INO_INVALID_ATTR    0x0001          /* cached attrs are invalid */
 193 #define NFS_INO_INVALID_DATA    0x0002          /* cached data is invalid */
 194 #define NFS_INO_INVALID_ATIME   0x0004          /* cached atime is invalid */
 195 #define NFS_INO_INVALID_ACCESS  0x0008          /* cached access cred invalid */
 196 #define NFS_INO_INVALID_ACL     0x0010          /* cached acls are invalid */
 197 #define NFS_INO_REVAL_PAGECACHE 0x0020          /* must revalidate pagecache */
 198
 199 /*
 200  * Bit offsets in flags field
 201  */
 202 #define NFS_INO_REVALIDATING    (0)             /* revalidating attrs */
 203 #define NFS_INO_ADVISE_RDPLUS   (1)             /* advise readdirplus */
 204 #define NFS_INO_STALE           (2)             /* possible stale inode */
 205
 206 static inline struct nfs_inode *NFS_I(struct inode *inode)
 207 {
 208         return container_of(inode, struct nfs_inode, vfs_inode);
 209 }
 210 #define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))
 211
 212 #define NFS_FH(inode)                   (&NFS_I(inode)->fh)
 213 #define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
 214 #define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
 215 #define NFS_PROTO(inode)                (NFS_SERVER(inode)->rpc_ops)
 216 #define NFS_ADDR(inode)                 (RPC_PEERADDR(NFS_CLIENT(inode)))
 217 #define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
 218 #define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
 219 #define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
 220 #define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
 221 #define NFS_MINATTRTIMEO(inode) \
 222         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 223                                : NFS_SERVER(inode)->acregmin)
 224 #define NFS_MAXATTRTIMEO(inode) \
 225         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 226                                : NFS_SERVER(inode)->acregmax)
 227 #define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)
 228
 229 #define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
 230 #define NFS_STALE(inode)                (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
 231
 232 #define NFS_FILEID(inode)               (NFS_I(inode)->fileid)
 233
 234 static inline int nfs_caches_unstable(struct inode *inode)
 235 {
 236         return atomic_read(&NFS_I(inode)->data_updates) != 0;
 237 }
 238
 239 static inline void NFS_CACHEINV(struct inode *inode)
 240 {
 241         if (!nfs_caches_unstable(inode)) {
 242                 spin_lock(&inode->i_lock);
 243                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
 244                 spin_unlock(&inode->i_lock);
 245         }
 246 }
 247
 248 static inline int nfs_server_capable(struct inode *inode, int cap)
 249 {
 250         return NFS_SERVER(inode)->caps & cap;
 251 }
 252
 253 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 254 {
 255         return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
 256 }
 257
 258 /**
 259  * nfs_save_change_attribute - Returns the inode attribute change cookie
 260  * @inode - pointer to inode
 261  * The "change attribute" is updated every time we finish an operation
 262  * that will result in a metadata change on the server.
 263  */
 264 static inline long nfs_save_change_attribute(struct inode *inode)
 265 {
 266         return NFS_I(inode)->cache_change_attribute;
 267 }
 268
 269 /**
 270  * nfs_verify_change_attribute - Detects NFS inode cache updates
 271  * @inode - pointer to inode
 272  * @chattr - previously saved change attribute
 273  * Return "false" if metadata has been updated (or is in the process of
 274  * being updated) since the change attribute was saved.
 275  */
 276 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 277 {
 278         return !nfs_caches_unstable(inode)
 279                 && chattr == NFS_I(inode)->cache_change_attribute;
 280 }
 281
 282 /*
 283  * linux/fs/nfs/inode.c
 284  */
 285 extern void nfs_zap_caches(struct inode *);
 286 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 287                                 struct nfs_fattr *);
 288 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 289 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 290 extern int nfs_permission(struct inode *, int, struct nameidata *);
 291 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
 292 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 293 extern int nfs_open(struct inode *, struct file *);
 294 extern int nfs_release(struct inode *, struct file *);
 295 extern int nfs_attribute_timeout(struct inode *inode);
 296 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 297 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 298 extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 299 extern int nfs_setattr(struct dentry *, struct iattr *);
 300 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 301 extern void nfs_begin_attr_update(struct inode *);
 302 extern void nfs_end_attr_update(struct inode *);
 303 extern void nfs_begin_data_update(struct inode *);
 304 extern void nfs_end_data_update(struct inode *);
 305 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
 306 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 307 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 308 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 309 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
 310 extern void nfs_file_clear_open_context(struct file *filp);
 311
 312 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 313 extern u32 root_nfs_parse_addr(char *name); /*__init*/
 314
 315 /*
 316  * linux/fs/nfs/file.c
 317  */
 318 extern struct inode_operations nfs_file_inode_operations;
 319 #ifdef CONFIG_NFS_V3
 320 extern struct inode_operations nfs3_file_inode_operations;
 321 #endif /* CONFIG_NFS_V3 */
 322 extern struct file_operations nfs_file_operations;
 323 extern struct address_space_operations nfs_file_aops;
 324
 325 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 326 {
 327         if (file != NULL) {
 328                 struct nfs_open_context *ctx;
 329
 330                 ctx = (struct nfs_open_context*)file->private_data;
 331                 return ctx->cred;
 332         }
 333         return NULL;
 334 }
 335
 336 /*
 337  * linux/fs/nfs/xattr.c
 338  */
 339 #ifdef CONFIG_NFS_V3_ACL
 340 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 341 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 342 extern int nfs3_setxattr(struct dentry *, const char *,
 343                         const void *, size_t, int);
 344 extern int nfs3_removexattr (struct dentry *, const char *name);
 345 #else
 346 # define nfs3_listxattr NULL
 347 # define nfs3_getxattr NULL
 348 # define nfs3_setxattr NULL
 349 # define nfs3_removexattr NULL
 350 #endif
 351
 352 /*
 353  * linux/fs/nfs/direct.c
 354  */
 355 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 356                         unsigned long);
 357 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
 358                         size_t count, loff_t pos);
 359 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
 360                         size_t count, loff_t pos);
 361
 362 /*
 363  * linux/fs/nfs/dir.c
 364  */
 365 extern struct inode_operations nfs_dir_inode_operations;
 366 #ifdef CONFIG_NFS_V3
 367 extern struct inode_operations nfs3_dir_inode_operations;
 368 #endif /* CONFIG_NFS_V3 */
 369 extern struct file_operations nfs_dir_operations;
 370 extern struct dentry_operations nfs_dentry_operations;
 371
 372 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 373
 374 /*
 375  * linux/fs/nfs/symlink.c
 376  */
 377 extern struct inode_operations nfs_symlink_inode_operations;
 378
 379 /*
 380  * linux/fs/nfs/unlink.c
 381  */
 382 extern int  nfs_async_unlink(struct dentry *);
 383 extern void nfs_complete_unlink(struct dentry *);
 384
 385 /*
 386  * linux/fs/nfs/write.c
 387  */
 388 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 389 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 390 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 391 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 392 extern void nfs_writeback_done(struct rpc_task *task);
 393
 394 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 395 extern void nfs_commit_done(struct rpc_task *);
 396 #endif
 397
 398 /*
 399  * Try to write back everything synchronously (but check the
 400  * return value!)
 401  */
 402 extern int  nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
 403 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 404 extern int  nfs_commit_inode(struct inode *, int);
 405 #else
 406 static inline int
 407 nfs_commit_inode(struct inode *inode, int how)
 408 {
 409         return 0;
 410 }
 411 #endif
 412
 413 static inline int
 414 nfs_have_writebacks(struct inode *inode)
 415 {
 416         return NFS_I(inode)->npages != 0;
 417 }
 418
 419 static inline int
 420 nfs_wb_all(struct inode *inode)
 421 {
 422         int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
 423         return (error < 0) ? error : 0;
 424 }
 425
 426 /*
 427  * Write back all requests on one page - we do this before reading it.
 428  */
 429 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
 430 {
 431         int error = nfs_sync_inode(inode, page->index, 1,
 432                         how | FLUSH_WAIT | FLUSH_STABLE);
 433         return (error < 0) ? error : 0;
 434 }
 435
 436 static inline int nfs_wb_page(struct inode *inode, struct page* page)
 437 {
 438         return nfs_wb_page_priority(inode, page, 0);
 439 }
 440
 441 /*
 442  * Allocate and free nfs_write_data structures
 443  */
 444 extern mempool_t *nfs_wdata_mempool;
 445
 446 static inline struct nfs_write_data *nfs_writedata_alloc(void)
 447 {
 448         struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
 449         if (p) {
 450                 memset(p, 0, sizeof(*p));
 451                 INIT_LIST_HEAD(&p->pages);
 452         }
 453         return p;
 454 }
 455
 456 static inline void nfs_writedata_free(struct nfs_write_data *p)
 457 {
 458         mempool_free(p, nfs_wdata_mempool);
 459 }
 460
 461 /*
 462  * linux/fs/nfs/read.c
 463  */
 464 extern int  nfs_readpage(struct file *, struct page *);
 465 extern int  nfs_readpages(struct file *, struct address_space *,
 466                 struct list_head *, unsigned);
 467 extern void nfs_readpage_result(struct rpc_task *);
 468
 469 /*
 470  * Allocate and free nfs_read_data structures
 471  */
 472 extern mempool_t *nfs_rdata_mempool;
 473
 474 static inline struct nfs_read_data *nfs_readdata_alloc(void)
 475 {
 476         struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
 477         if (p)
 478                 memset(p, 0, sizeof(*p));
 479         return p;
 480 }
 481
 482 static inline void nfs_readdata_free(struct nfs_read_data *p)
 483 {
 484         mempool_free(p, nfs_rdata_mempool);
 485 }
 486
 487 extern void  nfs_readdata_release(struct rpc_task *task);
 488
 489 /*
 490  * linux/fs/nfs3proc.c
 491  */
 492 #ifdef CONFIG_NFS_V3_ACL
 493 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 494 extern int nfs3_proc_setacl(struct inode *inode, int type,
 495                             struct posix_acl *acl);
 496 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 497                 mode_t mode);
 498 extern void nfs3_forget_cached_acls(struct inode *inode);
 499 #else
 500 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 501                                             struct inode *inode,
 502                                             mode_t mode)
 503 {
 504         return 0;
 505 }
 506
 507 static inline void nfs3_forget_cached_acls(struct inode *inode)
 508 {
 509 }
 510 #endif /* CONFIG_NFS_V3_ACL */
 511
 512 /*
 513  * linux/fs/mount_clnt.c
 514  * (Used only by nfsroot module)
 515  */
 516 extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
 517                 int, int);
 518
 519 /*
 520  * inline functions
 521  */
 522
 523 static inline loff_t
 524 nfs_size_to_loff_t(__u64 size)
 525 {
 526         loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
 527         if (size > maxsz)
 528                 return maxsz;
 529         return (loff_t) size;
 530 }
 531
 532 static inline ino_t
 533 nfs_fileid_to_ino_t(u64 fileid)
 534 {
 535         ino_t ino = (ino_t) fileid;
 536         if (sizeof(ino_t) < sizeof(u64))
 537                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 538         return ino;
 539 }
 540
 541 /* NFS root */
 542
 543 extern void * nfs_root_data(void);
 544
 545 #define nfs_wait_event(clnt, wq, condition)                             \
 546 ({                                                                      \
 547         int __retval = 0;                                               \
 548         if (clnt->cl_intr) {                                            \
 549                 sigset_t oldmask;                                       \
 550                 rpc_clnt_sigmask(clnt, &oldmask);                       \
 551                 __retval = wait_event_interruptible(wq, condition);     \
 552                 rpc_clnt_sigunmask(clnt, &oldmask);                     \
 553         } else                                                          \
 554                 wait_event(wq, condition);                              \
 555         __retval;                                                       \
 556 })
 557
 558 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 559
 560 #endif /* __KERNEL__ */
 561
 562 /*
 563  * NFS debug flags
 564  */
 565 #define NFSDBG_VFS              0x0001
 566 #define NFSDBG_DIRCACHE         0x0002
 567 #define NFSDBG_LOOKUPCACHE      0x0004
 568 #define NFSDBG_PAGECACHE        0x0008
 569 #define NFSDBG_PROC             0x0010
 570 #define NFSDBG_XDR              0x0020
 571 #define NFSDBG_FILE             0x0040
 572 #define NFSDBG_ROOT             0x0080
 573 #define NFSDBG_CALLBACK         0x0100
 574 #define NFSDBG_ALL              0xFFFF
 575
 576 #ifdef __KERNEL__
 577 # undef ifdebug
 578 # ifdef NFS_DEBUG
 579 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 580 # else
 581 #  define ifdebug(fac)          if (0)
 582 # endif
 583 #endif /* __KERNEL */
 584
 585 #endif