2 * linux/include/linux/nfs_fs.h
4 * Copyright (C) 1992 Rick Sladkey
6 * OS-specific nfs filesystem definitions and declarations
9 #ifndef _LINUX_NFS_FS_H
10 #define _LINUX_NFS_FS_H
12 #include <linux/magic.h>
14 /* Default timeout values */
15 #define NFS_DEF_UDP_TIMEO (11)
16 #define NFS_DEF_UDP_RETRANS (3)
17 #define NFS_DEF_TCP_TIMEO (600)
18 #define NFS_DEF_TCP_RETRANS (2)
20 #define NFS_MAX_UDP_TIMEOUT (60*HZ)
21 #define NFS_MAX_TCP_TIMEOUT (600*HZ)
23 #define NFS_DEF_ACREGMIN (3)
24 #define NFS_DEF_ACREGMAX (60)
25 #define NFS_DEF_ACDIRMIN (30)
26 #define NFS_DEF_ACDIRMAX (60)
29 * When flushing a cluster of dirty pages, there can be different
32 #define FLUSH_SYNC 1 /* file being synced, or contention */
33 #define FLUSH_STABLE 4 /* commit to stable storage */
34 #define FLUSH_LOWPRI 8 /* low priority background flush */
35 #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
36 #define FLUSH_COND_STABLE 32 /* conditional stable write - only stable
37 * if everything fits in one RPC */
43 #include <linux/pagemap.h>
44 #include <linux/rbtree.h>
45 #include <linux/rwsem.h>
46 #include <linux/wait.h>
48 #include <linux/sunrpc/debug.h>
49 #include <linux/sunrpc/auth.h>
50 #include <linux/sunrpc/clnt.h>
52 #include <linux/nfs.h>
53 #include <linux/nfs2.h>
54 #include <linux/nfs3.h>
55 #include <linux/nfs4.h>
56 #include <linux/nfs_xdr.h>
57 #include <linux/nfs_fs_sb.h>
59 #include <linux/mempool.h>
62 * These are the default flags for swap requests
64 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
67 * NFSv3/v4 Access mode cache entry
69 struct nfs_access_entry {
70 struct rb_node rb_node;
72 unsigned long jiffies;
73 struct rpc_cred * cred;
77 struct nfs_lock_context {
79 struct list_head list;
80 struct nfs_open_context *open_context;
86 struct nfs_open_context {
87 struct nfs_lock_context lock_context;
88 struct dentry *dentry;
89 struct rpc_cred *cred;
90 struct nfs4_state *state;
94 #define NFS_CONTEXT_ERROR_WRITE (0)
97 struct list_head list;
100 struct nfs_open_dir_context {
101 struct rpc_cred *cred;
102 unsigned long attr_gencount;
111 struct nfs_delegation;
116 * nfs fs inode data in memory
120 * The 64bit 'inode number'
132 unsigned long flags; /* atomic bit ops */
133 unsigned long cache_validity; /* bit mask */
136 * read_cache_jiffies is when we started read-caching this inode.
137 * attrtimeo is for how long the cached information is assumed
138 * to be valid. A successful attribute revalidation doubles
139 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
142 * We need to revalidate the cached attrs for this inode if
144 * jiffies - read_cache_jiffies >= attrtimeo
146 * Please note the comparison is greater than or equal
147 * so that zero timeout values can be specified.
149 unsigned long read_cache_jiffies;
150 unsigned long attrtimeo;
151 unsigned long attrtimeo_timestamp;
153 unsigned long attr_gencount;
154 /* "Generation counter" for the attribute cache. This is
155 * bumped whenever we update the metadata on the
158 unsigned long cache_change_attribute;
160 struct rb_root access_cache;
161 struct list_head access_cache_entry_lru;
162 struct list_head access_cache_inode_lru;
163 #ifdef CONFIG_NFS_V3_ACL
164 struct posix_acl *acl_access;
165 struct posix_acl *acl_default;
169 * This is the cookie verifier used for NFSv3 readdir
172 __be32 cookieverf[2];
175 * This is the list of dirty unwritten pages.
177 struct radix_tree_root nfs_page_tree;
179 unsigned long npages;
180 unsigned long ncommit;
182 /* Open contexts for shared mmap writes */
183 struct list_head open_files;
185 /* Number of in-flight sillydelete RPC calls */
186 atomic_t silly_count;
187 /* List of deferred sillydelete requests */
188 struct hlist_head silly_list;
189 wait_queue_head_t waitqueue;
192 struct nfs4_cached_acl *nfs4_acl;
194 struct list_head open_states;
195 struct nfs_delegation __rcu *delegation;
196 fmode_t delegation_state;
197 struct rw_semaphore rwsem;
199 /* pNFS layout information */
200 struct pnfs_layout_hdr *layout;
201 atomic_t commits_outstanding;
202 #endif /* CONFIG_NFS_V4*/
203 #ifdef CONFIG_NFS_FSCACHE
204 struct fscache_cookie *fscache;
206 struct inode vfs_inode;
210 * Cache validity bit flags
212 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
213 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
214 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
215 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
216 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
217 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
218 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
221 * Bit offsets in flags field
223 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
224 #define NFS_INO_STALE (1) /* possible stale inode */
225 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
226 #define NFS_INO_FLUSHING (4) /* inode is flushing out data */
227 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
228 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
229 #define NFS_INO_COMMIT (7) /* inode is committing unstable writes */
230 #define NFS_INO_PNFS_COMMIT (8) /* use pnfs code for commit */
231 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
232 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
234 static inline struct nfs_inode *NFS_I(const struct inode *inode)
236 return container_of(inode, struct nfs_inode, vfs_inode);
239 static inline struct nfs_server *NFS_SB(const struct super_block *s)
241 return (struct nfs_server *)(s->s_fs_info);
244 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
246 return &NFS_I(inode)->fh;
249 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
251 return NFS_SB(inode->i_sb);
254 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
256 return NFS_SERVER(inode)->client;
259 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
261 return NFS_SERVER(inode)->nfs_client->rpc_ops;
264 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
266 struct nfs_server *nfss = NFS_SERVER(inode);
267 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
270 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
272 struct nfs_server *nfss = NFS_SERVER(inode);
273 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
276 static inline int NFS_STALE(const struct inode *inode)
278 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
281 static inline int NFS_FSCACHE(const struct inode *inode)
283 return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
286 static inline __u64 NFS_FILEID(const struct inode *inode)
288 return NFS_I(inode)->fileid;
291 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
293 NFS_I(inode)->fileid = fileid;
296 static inline void nfs_mark_for_revalidate(struct inode *inode)
298 struct nfs_inode *nfsi = NFS_I(inode);
300 spin_lock(&inode->i_lock);
301 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
302 if (S_ISDIR(inode->i_mode))
303 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
304 spin_unlock(&inode->i_lock);
307 static inline int nfs_server_capable(struct inode *inode, int cap)
309 return NFS_SERVER(inode)->caps & cap;
312 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
314 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
317 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
319 dentry->d_time = verf;
323 * nfs_save_change_attribute - Returns the inode attribute change cookie
324 * @dir - pointer to parent directory inode
325 * The "change attribute" is updated every time we finish an operation
326 * that will result in a metadata change on the server.
328 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
330 return NFS_I(dir)->cache_change_attribute;
334 * nfs_verify_change_attribute - Detects NFS remote directory changes
335 * @dir - pointer to parent directory inode
336 * @chattr - previously saved change attribute
337 * Return "false" if the verifiers doesn't match the change attribute.
338 * This would usually indicate that the directory contents have changed on
339 * the server, and that any dentries need revalidating.
341 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
343 return chattr == NFS_I(dir)->cache_change_attribute;
347 * linux/fs/nfs/inode.c
349 extern int nfs_sync_mapping(struct address_space *mapping);
350 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
351 extern void nfs_zap_caches(struct inode *);
352 extern void nfs_invalidate_atime(struct inode *);
353 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
355 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
356 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
357 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
358 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
359 extern int nfs_permission(struct inode *, int);
360 extern int nfs_open(struct inode *, struct file *);
361 extern int nfs_release(struct inode *, struct file *);
362 extern int nfs_attribute_timeout(struct inode *inode);
363 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
364 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
365 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
366 extern int nfs_setattr(struct dentry *, struct iattr *);
367 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
368 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
369 extern void put_nfs_open_context(struct nfs_open_context *ctx);
370 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
371 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred, fmode_t f_mode);
372 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
373 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
374 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
375 extern u64 nfs_compat_user_ino64(u64 fileid);
376 extern void nfs_fattr_init(struct nfs_fattr *fattr);
377 extern unsigned long nfs_inc_attr_generation_counter(void);
379 extern struct nfs_fattr *nfs_alloc_fattr(void);
381 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
386 extern struct nfs_fh *nfs_alloc_fhandle(void);
388 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
394 * linux/fs/nfs/nfsroot.c
396 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
397 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
398 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
401 * linux/fs/nfs/file.c
403 extern const struct inode_operations nfs_file_inode_operations;
405 extern const struct inode_operations nfs3_file_inode_operations;
406 #endif /* CONFIG_NFS_V3 */
407 extern const struct file_operations nfs_file_operations;
409 extern const struct file_operations nfs4_file_operations;
410 #endif /* CONFIG_NFS_V4 */
411 extern const struct address_space_operations nfs_file_aops;
412 extern const struct address_space_operations nfs_dir_aops;
414 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
416 return filp->private_data;
419 static inline struct rpc_cred *nfs_file_cred(struct file *file)
422 struct nfs_open_context *ctx =
423 nfs_file_open_context(file);
431 * linux/fs/nfs/xattr.c
433 #ifdef CONFIG_NFS_V3_ACL
434 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
435 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
436 extern int nfs3_setxattr(struct dentry *, const char *,
437 const void *, size_t, int);
438 extern int nfs3_removexattr (struct dentry *, const char *name);
440 # define nfs3_listxattr NULL
441 # define nfs3_getxattr NULL
442 # define nfs3_setxattr NULL
443 # define nfs3_removexattr NULL
447 * linux/fs/nfs/direct.c
449 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
451 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
452 const struct iovec *iov, unsigned long nr_segs,
454 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
455 const struct iovec *iov, unsigned long nr_segs,
461 extern const struct inode_operations nfs_dir_inode_operations;
463 extern const struct inode_operations nfs3_dir_inode_operations;
464 #endif /* CONFIG_NFS_V3 */
465 extern const struct file_operations nfs_dir_operations;
466 extern const struct dentry_operations nfs_dentry_operations;
468 extern void nfs_force_lookup_revalidate(struct inode *dir);
469 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
470 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
471 extern void nfs_access_zap_cache(struct inode *inode);
474 * linux/fs/nfs/symlink.c
476 extern const struct inode_operations nfs_symlink_inode_operations;
479 * linux/fs/nfs/sysctl.c
482 extern int nfs_register_sysctl(void);
483 extern void nfs_unregister_sysctl(void);
485 #define nfs_register_sysctl() 0
486 #define nfs_unregister_sysctl() do { } while(0)
490 * linux/fs/nfs/namespace.c
492 extern const struct inode_operations nfs_mountpoint_inode_operations;
493 extern const struct inode_operations nfs_referral_inode_operations;
494 extern int nfs_mountpoint_expiry_timeout;
495 extern void nfs_release_automount_timer(void);
498 * linux/fs/nfs/unlink.c
500 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
501 extern void nfs_block_sillyrename(struct dentry *dentry);
502 extern void nfs_unblock_sillyrename(struct dentry *dentry);
503 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
506 * linux/fs/nfs/write.c
508 extern int nfs_congestion_kb;
509 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
510 extern int nfs_writepages(struct address_space *, struct writeback_control *);
511 extern int nfs_flush_incompatible(struct file *file, struct page *page);
512 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
513 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
516 * Try to write back everything synchronously (but check the
519 extern int nfs_wb_all(struct inode *inode);
520 extern int nfs_wb_page(struct inode *inode, struct page* page);
521 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
522 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
523 extern int nfs_commit_inode(struct inode *, int);
524 extern struct nfs_write_data *nfs_commitdata_alloc(void);
525 extern void nfs_commit_free(struct nfs_write_data *wdata);
528 nfs_commit_inode(struct inode *inode, int how)
535 nfs_have_writebacks(struct inode *inode)
537 return NFS_I(inode)->npages != 0;
541 * Allocate nfs_write_data structures
543 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
544 extern void nfs_writedata_free(struct nfs_write_data *);
547 * linux/fs/nfs/read.c
549 extern int nfs_readpage(struct file *, struct page *);
550 extern int nfs_readpages(struct file *, struct address_space *,
551 struct list_head *, unsigned);
552 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
553 extern int nfs_readpage_async(struct nfs_open_context *, struct inode *,
557 * Allocate nfs_read_data structures
559 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
560 extern void nfs_readdata_free(struct nfs_read_data *);
563 * linux/fs/nfs3proc.c
565 #ifdef CONFIG_NFS_V3_ACL
566 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
567 extern int nfs3_proc_setacl(struct inode *inode, int type,
568 struct posix_acl *acl);
569 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
571 extern void nfs3_forget_cached_acls(struct inode *inode);
573 static inline int nfs3_proc_set_default_acl(struct inode *dir,
580 static inline void nfs3_forget_cached_acls(struct inode *inode)
583 #endif /* CONFIG_NFS_V3_ACL */
589 static inline loff_t nfs_size_to_loff_t(__u64 size)
591 return min_t(u64, size, OFFSET_MAX);
595 nfs_fileid_to_ino_t(u64 fileid)
597 ino_t ino = (ino_t) fileid;
598 if (sizeof(ino_t) < sizeof(u64))
599 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
603 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
605 #endif /* __KERNEL__ */
610 #define NFSDBG_VFS 0x0001
611 #define NFSDBG_DIRCACHE 0x0002
612 #define NFSDBG_LOOKUPCACHE 0x0004
613 #define NFSDBG_PAGECACHE 0x0008
614 #define NFSDBG_PROC 0x0010
615 #define NFSDBG_XDR 0x0020
616 #define NFSDBG_FILE 0x0040
617 #define NFSDBG_ROOT 0x0080
618 #define NFSDBG_CALLBACK 0x0100
619 #define NFSDBG_CLIENT 0x0200
620 #define NFSDBG_MOUNT 0x0400
621 #define NFSDBG_FSCACHE 0x0800
622 #define NFSDBG_PNFS 0x1000
623 #define NFSDBG_PNFS_LD 0x2000
624 #define NFSDBG_ALL 0xFFFF
629 * Enable debugging support for nfs client.
630 * Requires RPC_DEBUG.
638 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
640 # define ifdebug(fac) if (0)
642 #endif /* __KERNEL */