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/pagemap.h>
46 #include <linux/rbtree.h>
47 #include <linux/rwsem.h>
48 #include <linux/wait.h>
50 #include <linux/sunrpc/debug.h>
51 #include <linux/sunrpc/auth.h>
52 #include <linux/sunrpc/clnt.h>
54 #include <linux/nfs.h>
55 #include <linux/nfs2.h>
56 #include <linux/nfs3.h>
57 #include <linux/nfs4.h>
58 #include <linux/nfs_xdr.h>
59 #include <linux/nfs_fs_sb.h>
61 #include <linux/mempool.h>
64 * These are the default flags for swap requests
66 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
69 * NFSv3/v4 Access mode cache entry
71 struct nfs_access_entry {
72 struct rb_node rb_node;
74 unsigned long jiffies;
75 struct rpc_cred * cred;
80 struct nfs_open_context {
83 struct rpc_cred *cred;
84 struct nfs4_state *state;
89 #define NFS_CONTEXT_ERROR_WRITE (0)
92 struct list_head list;
100 struct nfs_delegation;
105 * nfs fs inode data in memory
109 * The 64bit 'inode number'
121 unsigned long flags; /* atomic bit ops */
122 unsigned long cache_validity; /* bit mask */
125 * read_cache_jiffies is when we started read-caching this inode.
126 * attrtimeo is for how long the cached information is assumed
127 * to be valid. A successful attribute revalidation doubles
128 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
131 * We need to revalidate the cached attrs for this inode if
133 * jiffies - read_cache_jiffies >= attrtimeo
135 * Please note the comparison is greater than or equal
136 * so that zero timeout values can be specified.
138 unsigned long read_cache_jiffies;
139 unsigned long attrtimeo;
140 unsigned long attrtimeo_timestamp;
141 __u64 change_attr; /* v4 only */
143 unsigned long attr_gencount;
144 /* "Generation counter" for the attribute cache. This is
145 * bumped whenever we update the metadata on the
148 unsigned long cache_change_attribute;
150 struct rb_root access_cache;
151 struct list_head access_cache_entry_lru;
152 struct list_head access_cache_inode_lru;
153 #ifdef CONFIG_NFS_V3_ACL
154 struct posix_acl *acl_access;
155 struct posix_acl *acl_default;
159 * This is the cookie verifier used for NFSv3 readdir
162 __be32 cookieverf[2];
165 * This is the list of dirty unwritten pages.
167 struct radix_tree_root nfs_page_tree;
169 unsigned long npages;
171 /* Open contexts for shared mmap writes */
172 struct list_head open_files;
174 /* Number of in-flight sillydelete RPC calls */
175 atomic_t silly_count;
176 /* List of deferred sillydelete requests */
177 struct hlist_head silly_list;
178 wait_queue_head_t waitqueue;
181 struct nfs4_cached_acl *nfs4_acl;
183 struct list_head open_states;
184 struct nfs_delegation *delegation;
185 fmode_t delegation_state;
186 struct rw_semaphore rwsem;
187 #endif /* CONFIG_NFS_V4*/
188 struct inode vfs_inode;
192 * Cache validity bit flags
194 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
195 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
196 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
197 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
198 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
199 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
200 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
203 * Bit offsets in flags field
205 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
206 #define NFS_INO_STALE (1) /* possible stale inode */
207 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
208 #define NFS_INO_MOUNTPOINT (3) /* inode is remote mountpoint */
209 #define NFS_INO_FLUSHING (4) /* inode is flushing out data */
211 static inline struct nfs_inode *NFS_I(const struct inode *inode)
213 return container_of(inode, struct nfs_inode, vfs_inode);
216 static inline struct nfs_server *NFS_SB(const struct super_block *s)
218 return (struct nfs_server *)(s->s_fs_info);
221 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
223 return &NFS_I(inode)->fh;
226 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
228 return NFS_SB(inode->i_sb);
231 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
233 return NFS_SERVER(inode)->client;
236 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
238 return NFS_SERVER(inode)->nfs_client->rpc_ops;
241 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
243 return NFS_I(inode)->cookieverf;
246 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
248 struct nfs_server *nfss = NFS_SERVER(inode);
249 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
252 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
254 struct nfs_server *nfss = NFS_SERVER(inode);
255 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
258 static inline int NFS_STALE(const struct inode *inode)
260 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
263 static inline __u64 NFS_FILEID(const struct inode *inode)
265 return NFS_I(inode)->fileid;
268 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
270 NFS_I(inode)->fileid = fileid;
273 static inline void nfs_mark_for_revalidate(struct inode *inode)
275 struct nfs_inode *nfsi = NFS_I(inode);
277 spin_lock(&inode->i_lock);
278 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
279 if (S_ISDIR(inode->i_mode))
280 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
281 spin_unlock(&inode->i_lock);
284 static inline int nfs_server_capable(struct inode *inode, int cap)
286 return NFS_SERVER(inode)->caps & cap;
289 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
291 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
294 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
296 dentry->d_time = verf;
300 * nfs_save_change_attribute - Returns the inode attribute change cookie
301 * @dir - pointer to parent directory inode
302 * The "change attribute" is updated every time we finish an operation
303 * that will result in a metadata change on the server.
305 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
307 return NFS_I(dir)->cache_change_attribute;
311 * nfs_verify_change_attribute - Detects NFS remote directory changes
312 * @dir - pointer to parent directory inode
313 * @chattr - previously saved change attribute
314 * Return "false" if the verifiers doesn't match the change attribute.
315 * This would usually indicate that the directory contents have changed on
316 * the server, and that any dentries need revalidating.
318 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
320 return chattr == NFS_I(dir)->cache_change_attribute;
324 * linux/fs/nfs/inode.c
326 extern int nfs_sync_mapping(struct address_space *mapping);
327 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
328 extern void nfs_zap_caches(struct inode *);
329 extern void nfs_invalidate_atime(struct inode *);
330 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
332 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
333 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
334 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
335 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
336 extern int nfs_permission(struct inode *, int);
337 extern int nfs_open(struct inode *, struct file *);
338 extern int nfs_release(struct inode *, struct file *);
339 extern int nfs_attribute_timeout(struct inode *inode);
340 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
341 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
342 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
343 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
344 extern int nfs_setattr(struct dentry *, struct iattr *);
345 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
346 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
347 extern void put_nfs_open_context(struct nfs_open_context *ctx);
348 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
349 extern u64 nfs_compat_user_ino64(u64 fileid);
350 extern void nfs_fattr_init(struct nfs_fattr *fattr);
352 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
353 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
354 extern unsigned long nfs_inc_attr_generation_counter(void);
357 * linux/fs/nfs/file.c
359 extern const struct inode_operations nfs_file_inode_operations;
361 extern const struct inode_operations nfs3_file_inode_operations;
362 #endif /* CONFIG_NFS_V3 */
363 extern const struct file_operations nfs_file_operations;
364 extern const struct address_space_operations nfs_file_aops;
366 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
368 return filp->private_data;
371 static inline struct rpc_cred *nfs_file_cred(struct file *file)
374 struct nfs_open_context *ctx =
375 nfs_file_open_context(file);
383 * linux/fs/nfs/xattr.c
385 #ifdef CONFIG_NFS_V3_ACL
386 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
387 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
388 extern int nfs3_setxattr(struct dentry *, const char *,
389 const void *, size_t, int);
390 extern int nfs3_removexattr (struct dentry *, const char *name);
392 # define nfs3_listxattr NULL
393 # define nfs3_getxattr NULL
394 # define nfs3_setxattr NULL
395 # define nfs3_removexattr NULL
399 * linux/fs/nfs/direct.c
401 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
403 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
404 const struct iovec *iov, unsigned long nr_segs,
406 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
407 const struct iovec *iov, unsigned long nr_segs,
413 extern const struct inode_operations nfs_dir_inode_operations;
415 extern const struct inode_operations nfs3_dir_inode_operations;
416 #endif /* CONFIG_NFS_V3 */
417 extern const struct file_operations nfs_dir_operations;
418 extern const struct dentry_operations nfs_dentry_operations;
420 extern void nfs_force_lookup_revalidate(struct inode *dir);
421 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
422 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
423 extern void nfs_access_zap_cache(struct inode *inode);
426 * linux/fs/nfs/symlink.c
428 extern const struct inode_operations nfs_symlink_inode_operations;
431 * linux/fs/nfs/sysctl.c
434 extern int nfs_register_sysctl(void);
435 extern void nfs_unregister_sysctl(void);
437 #define nfs_register_sysctl() 0
438 #define nfs_unregister_sysctl() do { } while(0)
442 * linux/fs/nfs/namespace.c
444 extern const struct inode_operations nfs_mountpoint_inode_operations;
445 extern const struct inode_operations nfs_referral_inode_operations;
446 extern int nfs_mountpoint_expiry_timeout;
447 extern void nfs_release_automount_timer(void);
450 * linux/fs/nfs/unlink.c
452 extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry);
453 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
454 extern void nfs_block_sillyrename(struct dentry *dentry);
455 extern void nfs_unblock_sillyrename(struct dentry *dentry);
458 * linux/fs/nfs/write.c
460 extern int nfs_congestion_kb;
461 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
462 extern int nfs_writepages(struct address_space *, struct writeback_control *);
463 extern int nfs_flush_incompatible(struct file *file, struct page *page);
464 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
465 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
466 extern void nfs_writedata_release(void *);
469 * Try to write back everything synchronously (but check the
472 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
473 extern int nfs_wb_all(struct inode *inode);
474 extern int nfs_wb_nocommit(struct inode *inode);
475 extern int nfs_wb_page(struct inode *inode, struct page* page);
476 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
477 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
478 extern int nfs_commit_inode(struct inode *, int);
479 extern struct nfs_write_data *nfs_commitdata_alloc(void);
480 extern void nfs_commit_free(struct nfs_write_data *wdata);
481 extern void nfs_commitdata_release(void *wdata);
484 nfs_commit_inode(struct inode *inode, int how)
491 nfs_have_writebacks(struct inode *inode)
493 return NFS_I(inode)->npages != 0;
497 * Allocate nfs_write_data structures
499 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
502 * linux/fs/nfs/read.c
504 extern int nfs_readpage(struct file *, struct page *);
505 extern int nfs_readpages(struct file *, struct address_space *,
506 struct list_head *, unsigned);
507 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
508 extern void nfs_readdata_release(void *data);
511 * Allocate nfs_read_data structures
513 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
516 * linux/fs/nfs3proc.c
518 #ifdef CONFIG_NFS_V3_ACL
519 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
520 extern int nfs3_proc_setacl(struct inode *inode, int type,
521 struct posix_acl *acl);
522 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
524 extern void nfs3_forget_cached_acls(struct inode *inode);
526 static inline int nfs3_proc_set_default_acl(struct inode *dir,
533 static inline void nfs3_forget_cached_acls(struct inode *inode)
536 #endif /* CONFIG_NFS_V3_ACL */
542 static inline loff_t nfs_size_to_loff_t(__u64 size)
544 if (size > (__u64) OFFSET_MAX - 1)
545 return OFFSET_MAX - 1;
546 return (loff_t) size;
550 nfs_fileid_to_ino_t(u64 fileid)
552 ino_t ino = (ino_t) fileid;
553 if (sizeof(ino_t) < sizeof(u64))
554 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
560 extern void * nfs_root_data(void);
562 #define nfs_wait_event(clnt, wq, condition) \
564 int __retval = wait_event_killable(wq, condition); \
568 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
570 #endif /* __KERNEL__ */
575 #define NFSDBG_VFS 0x0001
576 #define NFSDBG_DIRCACHE 0x0002
577 #define NFSDBG_LOOKUPCACHE 0x0004
578 #define NFSDBG_PAGECACHE 0x0008
579 #define NFSDBG_PROC 0x0010
580 #define NFSDBG_XDR 0x0020
581 #define NFSDBG_FILE 0x0040
582 #define NFSDBG_ROOT 0x0080
583 #define NFSDBG_CALLBACK 0x0100
584 #define NFSDBG_CLIENT 0x0200
585 #define NFSDBG_MOUNT 0x0400
586 #define NFSDBG_ALL 0xFFFF
591 * Enable debugging support for nfs client.
592 * Requires RPC_DEBUG.
600 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
602 # define ifdebug(fac) if (0)
604 #endif /* __KERNEL */