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 int            flags;
 116
 117         /*
 118          * read_cache_jiffies is when we started read-caching this inode,
 119          * and read_cache_mtime is the mtime of the inode at that time.
 120          * attrtimeo is for how long the cached information is assumed
 121          * to be valid. A successful attribute revalidation doubles
 122          * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 123          * acregmin/acdirmin.
 124          *
 125          * We need to revalidate the cached attrs for this inode if
 126          *
 127          *      jiffies - read_cache_jiffies > attrtimeo
 128          *
 129          * and invalidate any cached data/flush out any dirty pages if
 130          * we find that
 131          *
 132          *      mtime != read_cache_mtime
 133          */
 134         unsigned long           read_cache_jiffies;
 135         unsigned long           attrtimeo;
 136         unsigned long           attrtimeo_timestamp;
 137         __u64                   change_attr;            /* v4 only */
 138
 139         /* "Generation counter" for the attribute cache. This is
 140          * bumped whenever we update the metadata on the
 141          * server.
 142          */
 143         unsigned long           cache_change_attribute;
 144         /*
 145          * Counter indicating the number of outstanding requests that
 146          * will cause a file data update.
 147          */
 148         atomic_t                data_updates;
 149
 150         struct nfs_access_entry cache_access;
 151 #ifdef CONFIG_NFS_V3_ACL
 152         struct posix_acl        *acl_access;
 153         struct posix_acl        *acl_default;
 154 #endif
 155
 156         /*
 157          * This is the cookie verifier used for NFSv3 readdir
 158          * operations
 159          */
 160         __u32                   cookieverf[2];
 161
 162         /*
 163          * This is the list of dirty unwritten pages.
 164          */
 165         spinlock_t              req_lock;
 166         struct list_head        dirty;
 167         struct list_head        commit;
 168         struct radix_tree_root  nfs_page_tree;
 169
 170         unsigned int            ndirty,
 171                                 ncommit,
 172                                 npages;
 173
 174         /* Open contexts for shared mmap writes */
 175         struct list_head        open_files;
 176
 177         wait_queue_head_t       nfs_i_wait;
 178
 179 #ifdef CONFIG_NFS_V4
 180         struct nfs4_cached_acl  *nfs4_acl;
 181         /* NFSv4 state */
 182         struct list_head        open_states;
 183         struct nfs_delegation   *delegation;
 184         int                      delegation_state;
 185         struct rw_semaphore     rwsem;
 186 #endif /* CONFIG_NFS_V4*/
 187         struct inode            vfs_inode;
 188 };
 189
 190 /*
 191  * Legal inode flag values
 192  */
 193 #define NFS_INO_STALE           0x0001          /* possible stale inode */
 194 #define NFS_INO_ADVISE_RDPLUS   0x0002          /* advise readdirplus */
 195 #define NFS_INO_REVALIDATING    0x0004          /* revalidating attrs */
 196 #define NFS_INO_INVALID_ATTR    0x0008          /* cached attrs are invalid */
 197 #define NFS_INO_INVALID_DATA    0x0010          /* cached data is invalid */
 198 #define NFS_INO_INVALID_ATIME   0x0020          /* cached atime is invalid */
 199 #define NFS_INO_INVALID_ACCESS  0x0040          /* cached access cred invalid */
 200 #define NFS_INO_INVALID_ACL     0x0080          /* cached acls are invalid */
 201 #define NFS_INO_REVAL_PAGECACHE 0x1000          /* must revalidate pagecache */
 202
 203 static inline struct nfs_inode *NFS_I(struct inode *inode)
 204 {
 205         return container_of(inode, struct nfs_inode, vfs_inode);
 206 }
 207 #define NFS_SB(s)               ((struct nfs_server *)(s->s_fs_info))
 208
 209 #define NFS_FH(inode)                   (&NFS_I(inode)->fh)
 210 #define NFS_SERVER(inode)               (NFS_SB(inode->i_sb))
 211 #define NFS_CLIENT(inode)               (NFS_SERVER(inode)->client)
 212 #define NFS_PROTO(inode)                (NFS_SERVER(inode)->rpc_ops)
 213 #define NFS_ADDR(inode)                 (RPC_PEERADDR(NFS_CLIENT(inode)))
 214 #define NFS_COOKIEVERF(inode)           (NFS_I(inode)->cookieverf)
 215 #define NFS_READTIME(inode)             (NFS_I(inode)->read_cache_jiffies)
 216 #define NFS_CHANGE_ATTR(inode)          (NFS_I(inode)->change_attr)
 217 #define NFS_ATTRTIMEO(inode)            (NFS_I(inode)->attrtimeo)
 218 #define NFS_MINATTRTIMEO(inode) \
 219         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 220                                : NFS_SERVER(inode)->acregmin)
 221 #define NFS_MAXATTRTIMEO(inode) \
 222         (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 223                                : NFS_SERVER(inode)->acregmax)
 224 #define NFS_ATTRTIMEO_UPDATE(inode)     (NFS_I(inode)->attrtimeo_timestamp)
 225
 226 #define NFS_FLAGS(inode)                (NFS_I(inode)->flags)
 227 #define NFS_REVALIDATING(inode)         (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
 228 #define NFS_STALE(inode)                (NFS_FLAGS(inode) & NFS_INO_STALE)
 229
 230 #define NFS_FILEID(inode)               (NFS_I(inode)->fileid)
 231
 232 static inline int nfs_caches_unstable(struct inode *inode)
 233 {
 234         return atomic_read(&NFS_I(inode)->data_updates) != 0;
 235 }
 236
 237 static inline void NFS_CACHEINV(struct inode *inode)
 238 {
 239         if (!nfs_caches_unstable(inode))
 240                 NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
 241 }
 242
 243 static inline int nfs_server_capable(struct inode *inode, int cap)
 244 {
 245         return NFS_SERVER(inode)->caps & cap;
 246 }
 247
 248 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
 249 {
 250         return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
 251 }
 252
 253 /**
 254  * nfs_save_change_attribute - Returns the inode attribute change cookie
 255  * @inode - pointer to inode
 256  * The "change attribute" is updated every time we finish an operation
 257  * that will result in a metadata change on the server.
 258  */
 259 static inline long nfs_save_change_attribute(struct inode *inode)
 260 {
 261         return NFS_I(inode)->cache_change_attribute;
 262 }
 263
 264 /**
 265  * nfs_verify_change_attribute - Detects NFS inode cache updates
 266  * @inode - pointer to inode
 267  * @chattr - previously saved change attribute
 268  * Return "false" if metadata has been updated (or is in the process of
 269  * being updated) since the change attribute was saved.
 270  */
 271 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
 272 {
 273         return !nfs_caches_unstable(inode)
 274                 && chattr == NFS_I(inode)->cache_change_attribute;
 275 }
 276
 277 /*
 278  * linux/fs/nfs/inode.c
 279  */
 280 extern void nfs_zap_caches(struct inode *);
 281 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 282                                 struct nfs_fattr *);
 283 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 284 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 285 extern int nfs_permission(struct inode *, int, struct nameidata *);
 286 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
 287 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
 288 extern int nfs_open(struct inode *, struct file *);
 289 extern int nfs_release(struct inode *, struct file *);
 290 extern int nfs_attribute_timeout(struct inode *inode);
 291 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
 292 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 293 extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
 294 extern int nfs_setattr(struct dentry *, struct iattr *);
 295 extern void nfs_begin_attr_update(struct inode *);
 296 extern void nfs_end_attr_update(struct inode *);
 297 extern void nfs_begin_data_update(struct inode *);
 298 extern void nfs_end_data_update(struct inode *);
 299 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
 300 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 301 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 302 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 303 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
 304 extern void nfs_file_clear_open_context(struct file *filp);
 305
 306 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
 307 extern u32 root_nfs_parse_addr(char *name); /*__init*/
 308
 309 /*
 310  * linux/fs/nfs/file.c
 311  */
 312 extern struct inode_operations nfs_file_inode_operations;
 313 #ifdef CONFIG_NFS_V3
 314 extern struct inode_operations nfs3_file_inode_operations;
 315 #endif /* CONFIG_NFS_V3 */
 316 extern struct file_operations nfs_file_operations;
 317 extern struct address_space_operations nfs_file_aops;
 318
 319 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 320 {
 321         if (file != NULL) {
 322                 struct nfs_open_context *ctx;
 323
 324                 ctx = (struct nfs_open_context*)file->private_data;
 325                 return ctx->cred;
 326         }
 327         return NULL;
 328 }
 329
 330 /*
 331  * linux/fs/nfs/xattr.c
 332  */
 333 #ifdef CONFIG_NFS_V3_ACL
 334 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
 335 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
 336 extern int nfs3_setxattr(struct dentry *, const char *,
 337                         const void *, size_t, int);
 338 extern int nfs3_removexattr (struct dentry *, const char *name);
 339 #else
 340 # define nfs3_listxattr NULL
 341 # define nfs3_getxattr NULL
 342 # define nfs3_setxattr NULL
 343 # define nfs3_removexattr NULL
 344 #endif
 345
 346 /*
 347  * linux/fs/nfs/direct.c
 348  */
 349 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
 350                         unsigned long);
 351 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
 352                         size_t count, loff_t pos);
 353 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
 354                         size_t count, loff_t pos);
 355
 356 /*
 357  * linux/fs/nfs/dir.c
 358  */
 359 extern struct inode_operations nfs_dir_inode_operations;
 360 #ifdef CONFIG_NFS_V3
 361 extern struct inode_operations nfs3_dir_inode_operations;
 362 #endif /* CONFIG_NFS_V3 */
 363 extern struct file_operations nfs_dir_operations;
 364 extern struct dentry_operations nfs_dentry_operations;
 365
 366 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
 367
 368 /*
 369  * linux/fs/nfs/symlink.c
 370  */
 371 extern struct inode_operations nfs_symlink_inode_operations;
 372
 373 /*
 374  * linux/fs/nfs/unlink.c
 375  */
 376 extern int  nfs_async_unlink(struct dentry *);
 377 extern void nfs_complete_unlink(struct dentry *);
 378
 379 /*
 380  * linux/fs/nfs/write.c
 381  */
 382 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
 383 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
 384 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 385 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 386 extern void nfs_writeback_done(struct rpc_task *task);
 387
 388 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 389 extern void nfs_commit_done(struct rpc_task *);
 390 #endif
 391
 392 /*
 393  * Try to write back everything synchronously (but check the
 394  * return value!)
 395  */
 396 extern int  nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
 397 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
 398 extern int  nfs_commit_inode(struct inode *, int);
 399 #else
 400 static inline int
 401 nfs_commit_inode(struct inode *inode, int how)
 402 {
 403         return 0;
 404 }
 405 #endif
 406
 407 static inline int
 408 nfs_have_writebacks(struct inode *inode)
 409 {
 410         return NFS_I(inode)->npages != 0;
 411 }
 412
 413 static inline int
 414 nfs_wb_all(struct inode *inode)
 415 {
 416         int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
 417         return (error < 0) ? error : 0;
 418 }
 419
 420 /*
 421  * Write back all requests on one page - we do this before reading it.
 422  */
 423 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
 424 {
 425         int error = nfs_sync_inode(inode, page->index, 1,
 426                         how | FLUSH_WAIT | FLUSH_STABLE);
 427         return (error < 0) ? error : 0;
 428 }
 429
 430 static inline int nfs_wb_page(struct inode *inode, struct page* page)
 431 {
 432         return nfs_wb_page_priority(inode, page, 0);
 433 }
 434
 435 /*
 436  * Allocate and free nfs_write_data structures
 437  */
 438 extern mempool_t *nfs_wdata_mempool;
 439
 440 static inline struct nfs_write_data *nfs_writedata_alloc(void)
 441 {
 442         struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
 443         if (p) {
 444                 memset(p, 0, sizeof(*p));
 445                 INIT_LIST_HEAD(&p->pages);
 446         }
 447         return p;
 448 }
 449
 450 static inline void nfs_writedata_free(struct nfs_write_data *p)
 451 {
 452         mempool_free(p, nfs_wdata_mempool);
 453 }
 454
 455 /*
 456  * linux/fs/nfs/read.c
 457  */
 458 extern int  nfs_readpage(struct file *, struct page *);
 459 extern int  nfs_readpages(struct file *, struct address_space *,
 460                 struct list_head *, unsigned);
 461 extern void nfs_readpage_result(struct rpc_task *);
 462
 463 /*
 464  * Allocate and free nfs_read_data structures
 465  */
 466 extern mempool_t *nfs_rdata_mempool;
 467
 468 static inline struct nfs_read_data *nfs_readdata_alloc(void)
 469 {
 470         struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
 471         if (p)
 472                 memset(p, 0, sizeof(*p));
 473         return p;
 474 }
 475
 476 static inline void nfs_readdata_free(struct nfs_read_data *p)
 477 {
 478         mempool_free(p, nfs_rdata_mempool);
 479 }
 480
 481 extern void  nfs_readdata_release(struct rpc_task *task);
 482
 483 /*
 484  * linux/fs/nfs3proc.c
 485  */
 486 #ifdef CONFIG_NFS_V3_ACL
 487 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
 488 extern int nfs3_proc_setacl(struct inode *inode, int type,
 489                             struct posix_acl *acl);
 490 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
 491                 mode_t mode);
 492 extern void nfs3_forget_cached_acls(struct inode *inode);
 493 #else
 494 static inline int nfs3_proc_set_default_acl(struct inode *dir,
 495                                             struct inode *inode,
 496                                             mode_t mode)
 497 {
 498         return 0;
 499 }
 500
 501 static inline void nfs3_forget_cached_acls(struct inode *inode)
 502 {
 503 }
 504 #endif /* CONFIG_NFS_V3_ACL */
 505
 506 /*
 507  * linux/fs/mount_clnt.c
 508  * (Used only by nfsroot module)
 509  */
 510 extern int  nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
 511                 int, int);
 512
 513 /*
 514  * inline functions
 515  */
 516
 517 static inline loff_t
 518 nfs_size_to_loff_t(__u64 size)
 519 {
 520         loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
 521         if (size > maxsz)
 522                 return maxsz;
 523         return (loff_t) size;
 524 }
 525
 526 static inline ino_t
 527 nfs_fileid_to_ino_t(u64 fileid)
 528 {
 529         ino_t ino = (ino_t) fileid;
 530         if (sizeof(ino_t) < sizeof(u64))
 531                 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 532         return ino;
 533 }
 534
 535 /* NFS root */
 536
 537 extern void * nfs_root_data(void);
 538
 539 #define nfs_wait_event(clnt, wq, condition)                             \
 540 ({                                                                      \
 541         int __retval = 0;                                               \
 542         if (clnt->cl_intr) {                                            \
 543                 sigset_t oldmask;                                       \
 544                 rpc_clnt_sigmask(clnt, &oldmask);                       \
 545                 __retval = wait_event_interruptible(wq, condition);     \
 546                 rpc_clnt_sigunmask(clnt, &oldmask);                     \
 547         } else                                                          \
 548                 wait_event(wq, condition);                              \
 549         __retval;                                                       \
 550 })
 551
 552 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 553
 554 #endif /* __KERNEL__ */
 555
 556 /*
 557  * NFS debug flags
 558  */
 559 #define NFSDBG_VFS              0x0001
 560 #define NFSDBG_DIRCACHE         0x0002
 561 #define NFSDBG_LOOKUPCACHE      0x0004
 562 #define NFSDBG_PAGECACHE        0x0008
 563 #define NFSDBG_PROC             0x0010
 564 #define NFSDBG_XDR              0x0020
 565 #define NFSDBG_FILE             0x0040
 566 #define NFSDBG_ROOT             0x0080
 567 #define NFSDBG_CALLBACK         0x0100
 568 #define NFSDBG_ALL              0xFFFF
 569
 570 #ifdef __KERNEL__
 571 # undef ifdebug
 572 # ifdef NFS_DEBUG
 573 #  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
 574 # else
 575 #  define ifdebug(fac)          if (0)
 576 # endif
 577 #endif /* __KERNEL */
 578
 579 #endif