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_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
37 #define FLUSH_INVALIDATE 64 /* Invalidate the page cache */
38 #define FLUSH_NOWRITEPAGE 128 /* Don't call writepage() */
43 #include <linux/kref.h>
45 #include <linux/namei.h>
46 #include <linux/pagemap.h>
47 #include <linux/rbtree.h>
48 #include <linux/rwsem.h>
49 #include <linux/wait.h>
51 #include <linux/sunrpc/debug.h>
52 #include <linux/sunrpc/auth.h>
53 #include <linux/sunrpc/clnt.h>
55 #include <linux/nfs.h>
56 #include <linux/nfs2.h>
57 #include <linux/nfs3.h>
58 #include <linux/nfs4.h>
59 #include <linux/nfs_xdr.h>
60 #include <linux/nfs_fs_sb.h>
62 #include <linux/mempool.h>
65 * These are the default flags for swap requests
67 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
70 * NFSv3/v4 Access mode cache entry
72 struct nfs_access_entry {
73 struct rb_node rb_node;
75 unsigned long jiffies;
76 struct rpc_cred * cred;
81 struct nfs_open_context {
84 struct rpc_cred *cred;
85 struct nfs4_state *state;
90 #define NFS_CONTEXT_ERROR_WRITE (0)
93 struct list_head list;
101 struct nfs_delegation;
106 * nfs fs inode data in memory
110 * The 64bit 'inode number'
122 unsigned long flags; /* atomic bit ops */
123 unsigned long cache_validity; /* bit mask */
126 * read_cache_jiffies is when we started read-caching this inode.
127 * attrtimeo is for how long the cached information is assumed
128 * to be valid. A successful attribute revalidation doubles
129 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
132 * We need to revalidate the cached attrs for this inode if
134 * jiffies - read_cache_jiffies > attrtimeo
136 unsigned long read_cache_jiffies;
137 unsigned long attrtimeo;
138 unsigned long attrtimeo_timestamp;
139 __u64 change_attr; /* v4 only */
141 unsigned long last_updated;
142 /* "Generation counter" for the attribute cache. This is
143 * bumped whenever we update the metadata on the
146 unsigned long cache_change_attribute;
148 struct rb_root access_cache;
149 struct list_head access_cache_entry_lru;
150 struct list_head access_cache_inode_lru;
151 #ifdef CONFIG_NFS_V3_ACL
152 struct posix_acl *acl_access;
153 struct posix_acl *acl_default;
157 * This is the cookie verifier used for NFSv3 readdir
160 __be32 cookieverf[2];
163 * This is the list of dirty unwritten pages.
165 struct radix_tree_root nfs_page_tree;
167 unsigned long ncommit,
170 /* Open contexts for shared mmap writes */
171 struct list_head open_files;
173 /* Number of in-flight sillydelete RPC calls */
174 atomic_t silly_count;
175 /* List of deferred sillydelete requests */
176 struct hlist_head silly_list;
177 wait_queue_head_t waitqueue;
180 struct nfs4_cached_acl *nfs4_acl;
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;
191 * Cache validity bit flags
193 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
194 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
195 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
196 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
197 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
198 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
199 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
202 * Bit offsets in flags field
204 #define NFS_INO_REVALIDATING (0) /* revalidating attrs */
205 #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
206 #define NFS_INO_STALE (2) /* possible stale inode */
207 #define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
208 #define NFS_INO_MOUNTPOINT (4) /* inode is remote mountpoint */
210 static inline struct nfs_inode *NFS_I(const struct inode *inode)
212 return container_of(inode, struct nfs_inode, vfs_inode);
215 static inline struct nfs_server *NFS_SB(const struct super_block *s)
217 return (struct nfs_server *)(s->s_fs_info);
220 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
222 return &NFS_I(inode)->fh;
225 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
227 return NFS_SB(inode->i_sb);
230 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
232 return NFS_SERVER(inode)->client;
235 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
237 return NFS_SERVER(inode)->nfs_client->rpc_ops;
240 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
242 return NFS_I(inode)->cookieverf;
245 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
247 struct nfs_server *nfss = NFS_SERVER(inode);
248 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
251 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
253 struct nfs_server *nfss = NFS_SERVER(inode);
254 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
257 static inline int NFS_STALE(const struct inode *inode)
259 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
262 static inline __u64 NFS_FILEID(const struct inode *inode)
264 return NFS_I(inode)->fileid;
267 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
269 NFS_I(inode)->fileid = fileid;
272 static inline void nfs_mark_for_revalidate(struct inode *inode)
274 struct nfs_inode *nfsi = NFS_I(inode);
276 spin_lock(&inode->i_lock);
277 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
278 if (S_ISDIR(inode->i_mode))
279 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
280 spin_unlock(&inode->i_lock);
283 static inline int nfs_server_capable(struct inode *inode, int cap)
285 return NFS_SERVER(inode)->caps & cap;
288 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
290 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
293 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
295 dentry->d_time = verf;
299 * nfs_save_change_attribute - Returns the inode attribute change cookie
300 * @dir - pointer to parent directory inode
301 * The "change attribute" is updated every time we finish an operation
302 * that will result in a metadata change on the server.
304 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
306 return NFS_I(dir)->cache_change_attribute;
310 * nfs_verify_change_attribute - Detects NFS remote directory changes
311 * @dir - pointer to parent directory inode
312 * @chattr - previously saved change attribute
313 * Return "false" if the verifiers doesn't match the change attribute.
314 * This would usually indicate that the directory contents have changed on
315 * the server, and that any dentries need revalidating.
317 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
319 return chattr == NFS_I(dir)->cache_change_attribute;
323 * linux/fs/nfs/inode.c
325 extern int nfs_sync_mapping(struct address_space *mapping);
326 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
327 extern void nfs_zap_caches(struct inode *);
328 extern void nfs_invalidate_atime(struct inode *);
329 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
331 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
332 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
333 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
334 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
335 extern int nfs_permission(struct inode *, int, struct nameidata *);
336 extern int nfs_open(struct inode *, struct file *);
337 extern int nfs_release(struct inode *, struct file *);
338 extern int nfs_attribute_timeout(struct inode *inode);
339 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
340 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
341 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
342 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
343 extern int nfs_setattr(struct dentry *, struct iattr *);
344 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
345 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
346 extern void put_nfs_open_context(struct nfs_open_context *ctx);
347 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
348 extern u64 nfs_compat_user_ino64(u64 fileid);
350 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
351 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
353 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
356 fattr->time_start = jiffies;
360 * linux/fs/nfs/file.c
362 extern const struct inode_operations nfs_file_inode_operations;
364 extern const struct inode_operations nfs3_file_inode_operations;
365 #endif /* CONFIG_NFS_V3 */
366 extern const struct file_operations nfs_file_operations;
367 extern const struct address_space_operations nfs_file_aops;
369 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
371 return filp->private_data;
374 static inline struct rpc_cred *nfs_file_cred(struct file *file)
377 return nfs_file_open_context(file)->cred;
382 * linux/fs/nfs/xattr.c
384 #ifdef CONFIG_NFS_V3_ACL
385 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
386 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
387 extern int nfs3_setxattr(struct dentry *, const char *,
388 const void *, size_t, int);
389 extern int nfs3_removexattr (struct dentry *, const char *name);
391 # define nfs3_listxattr NULL
392 # define nfs3_getxattr NULL
393 # define nfs3_setxattr NULL
394 # define nfs3_removexattr NULL
398 * linux/fs/nfs/direct.c
400 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
402 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
403 const struct iovec *iov, unsigned long nr_segs,
405 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
406 const struct iovec *iov, unsigned long nr_segs,
412 extern const struct inode_operations nfs_dir_inode_operations;
414 extern const struct inode_operations nfs3_dir_inode_operations;
415 #endif /* CONFIG_NFS_V3 */
416 extern const struct file_operations nfs_dir_operations;
417 extern struct dentry_operations nfs_dentry_operations;
419 extern void nfs_force_lookup_revalidate(struct inode *dir);
420 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
421 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
422 extern void nfs_access_zap_cache(struct inode *inode);
425 * linux/fs/nfs/symlink.c
427 extern const struct inode_operations nfs_symlink_inode_operations;
430 * linux/fs/nfs/sysctl.c
433 extern int nfs_register_sysctl(void);
434 extern void nfs_unregister_sysctl(void);
436 #define nfs_register_sysctl() 0
437 #define nfs_unregister_sysctl() do { } while(0)
441 * linux/fs/nfs/namespace.c
443 extern const struct inode_operations nfs_mountpoint_inode_operations;
444 extern const struct inode_operations nfs_referral_inode_operations;
445 extern int nfs_mountpoint_expiry_timeout;
446 extern void nfs_release_automount_timer(void);
449 * linux/fs/nfs/unlink.c
451 extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry);
452 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
453 extern void nfs_block_sillyrename(struct dentry *dentry);
454 extern void nfs_unblock_sillyrename(struct dentry *dentry);
457 * linux/fs/nfs/write.c
459 extern int nfs_congestion_kb;
460 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
461 extern int nfs_writepages(struct address_space *, struct writeback_control *);
462 extern int nfs_flush_incompatible(struct file *file, struct page *page);
463 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
464 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
465 extern void nfs_writedata_release(void *);
468 * Try to write back everything synchronously (but check the
471 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
472 extern int nfs_wb_all(struct inode *inode);
473 extern int nfs_wb_nocommit(struct inode *inode);
474 extern int nfs_wb_page(struct inode *inode, struct page* page);
475 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
476 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
477 extern int nfs_commit_inode(struct inode *, int);
478 extern struct nfs_write_data *nfs_commitdata_alloc(void);
479 extern void nfs_commit_free(struct nfs_write_data *wdata);
480 extern void nfs_commitdata_release(void *wdata);
483 nfs_commit_inode(struct inode *inode, int how)
490 nfs_have_writebacks(struct inode *inode)
492 return NFS_I(inode)->npages != 0;
496 * Allocate nfs_write_data structures
498 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
501 * linux/fs/nfs/read.c
503 extern int nfs_readpage(struct file *, struct page *);
504 extern int nfs_readpages(struct file *, struct address_space *,
505 struct list_head *, unsigned);
506 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
507 extern void nfs_readdata_release(void *data);
510 * Allocate nfs_read_data structures
512 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
515 * linux/fs/nfs3proc.c
517 #ifdef CONFIG_NFS_V3_ACL
518 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
519 extern int nfs3_proc_setacl(struct inode *inode, int type,
520 struct posix_acl *acl);
521 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
523 extern void nfs3_forget_cached_acls(struct inode *inode);
525 static inline int nfs3_proc_set_default_acl(struct inode *dir,
532 static inline void nfs3_forget_cached_acls(struct inode *inode)
535 #endif /* CONFIG_NFS_V3_ACL */
538 * linux/fs/mount_clnt.c
540 extern int nfs_mount(struct sockaddr *, size_t, char *, char *,
541 int, int, struct nfs_fh *);
547 static inline loff_t nfs_size_to_loff_t(__u64 size)
549 if (size > (__u64) OFFSET_MAX - 1)
550 return OFFSET_MAX - 1;
551 return (loff_t) size;
555 nfs_fileid_to_ino_t(u64 fileid)
557 ino_t ino = (ino_t) fileid;
558 if (sizeof(ino_t) < sizeof(u64))
559 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
565 extern void * nfs_root_data(void);
567 #define nfs_wait_event(clnt, wq, condition) \
569 int __retval = wait_event_killable(wq, condition); \
573 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
575 #endif /* __KERNEL__ */
580 #define NFSDBG_VFS 0x0001
581 #define NFSDBG_DIRCACHE 0x0002
582 #define NFSDBG_LOOKUPCACHE 0x0004
583 #define NFSDBG_PAGECACHE 0x0008
584 #define NFSDBG_PROC 0x0010
585 #define NFSDBG_XDR 0x0020
586 #define NFSDBG_FILE 0x0040
587 #define NFSDBG_ROOT 0x0080
588 #define NFSDBG_CALLBACK 0x0100
589 #define NFSDBG_CLIENT 0x0200
590 #define NFSDBG_MOUNT 0x0400
591 #define NFSDBG_ALL 0xFFFF
596 * Enable debugging support for nfs client.
597 * Requires RPC_DEBUG.
605 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
607 # define ifdebug(fac) if (0)
609 #endif /* __KERNEL */