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_MAX_UDP_TIMEOUT (60*HZ)
16 #define NFS_MAX_TCP_TIMEOUT (600*HZ)
19 * When flushing a cluster of dirty pages, there can be different
22 #define FLUSH_SYNC 1 /* file being synced, or contention */
23 #define FLUSH_STABLE 4 /* commit to stable storage */
24 #define FLUSH_LOWPRI 8 /* low priority background flush */
25 #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
26 #define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
27 #define FLUSH_INVALIDATE 64 /* Invalidate the page cache */
28 #define FLUSH_NOWRITEPAGE 128 /* Don't call writepage() */
33 #include <linux/kref.h>
35 #include <linux/namei.h>
36 #include <linux/pagemap.h>
37 #include <linux/rbtree.h>
38 #include <linux/rwsem.h>
39 #include <linux/wait.h>
41 #include <linux/sunrpc/debug.h>
42 #include <linux/sunrpc/auth.h>
43 #include <linux/sunrpc/clnt.h>
45 #include <linux/nfs.h>
46 #include <linux/nfs2.h>
47 #include <linux/nfs3.h>
48 #include <linux/nfs4.h>
49 #include <linux/nfs_xdr.h>
50 #include <linux/nfs_fs_sb.h>
52 #include <linux/mempool.h>
55 * These are the default flags for swap requests
57 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
60 * NFSv3/v4 Access mode cache entry
62 struct nfs_access_entry {
63 struct rb_node rb_node;
65 unsigned long jiffies;
66 struct rpc_cred * cred;
71 struct nfs_open_context {
74 struct rpc_cred *cred;
75 struct nfs4_state *state;
80 #define NFS_CONTEXT_ERROR_WRITE (0)
83 struct list_head list;
91 struct nfs_delegation;
96 * nfs fs inode data in memory
100 * The 64bit 'inode number'
112 unsigned long flags; /* atomic bit ops */
113 unsigned long cache_validity; /* bit mask */
116 * read_cache_jiffies is when we started read-caching this inode.
117 * attrtimeo is for how long the cached information is assumed
118 * to be valid. A successful attribute revalidation doubles
119 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
122 * We need to revalidate the cached attrs for this inode if
124 * jiffies - read_cache_jiffies > attrtimeo
126 unsigned long read_cache_jiffies;
127 unsigned long attrtimeo;
128 unsigned long attrtimeo_timestamp;
129 __u64 change_attr; /* v4 only */
131 unsigned long last_updated;
132 /* "Generation counter" for the attribute cache. This is
133 * bumped whenever we update the metadata on the
136 unsigned long cache_change_attribute;
138 struct rb_root access_cache;
139 struct list_head access_cache_entry_lru;
140 struct list_head access_cache_inode_lru;
141 #ifdef CONFIG_NFS_V3_ACL
142 struct posix_acl *acl_access;
143 struct posix_acl *acl_default;
147 * This is the cookie verifier used for NFSv3 readdir
150 __be32 cookieverf[2];
153 * This is the list of dirty unwritten pages.
155 struct radix_tree_root nfs_page_tree;
157 unsigned long ncommit,
160 /* Open contexts for shared mmap writes */
161 struct list_head open_files;
163 /* Number of in-flight sillydelete RPC calls */
164 atomic_t silly_count;
165 /* List of deferred sillydelete requests */
166 struct hlist_head silly_list;
167 wait_queue_head_t waitqueue;
170 struct nfs4_cached_acl *nfs4_acl;
172 struct list_head open_states;
173 struct nfs_delegation *delegation;
174 int delegation_state;
175 struct rw_semaphore rwsem;
176 #endif /* CONFIG_NFS_V4*/
177 struct inode vfs_inode;
181 * Cache validity bit flags
183 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
184 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
185 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
186 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
187 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
188 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
189 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
192 * Bit offsets in flags field
194 #define NFS_INO_REVALIDATING (0) /* revalidating attrs */
195 #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
196 #define NFS_INO_STALE (2) /* possible stale inode */
197 #define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
199 static inline struct nfs_inode *NFS_I(const struct inode *inode)
201 return container_of(inode, struct nfs_inode, vfs_inode);
204 static inline struct nfs_server *NFS_SB(const struct super_block *s)
206 return (struct nfs_server *)(s->s_fs_info);
209 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
211 return &NFS_I(inode)->fh;
214 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
216 return NFS_SB(inode->i_sb);
219 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
221 return NFS_SERVER(inode)->client;
224 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
226 return NFS_SERVER(inode)->nfs_client->rpc_ops;
229 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
231 return NFS_I(inode)->cookieverf;
234 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
236 struct nfs_server *nfss = NFS_SERVER(inode);
237 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
240 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
242 struct nfs_server *nfss = NFS_SERVER(inode);
243 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
246 static inline int NFS_STALE(const struct inode *inode)
248 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
251 static inline __u64 NFS_FILEID(const struct inode *inode)
253 return NFS_I(inode)->fileid;
256 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
258 NFS_I(inode)->fileid = fileid;
261 static inline void nfs_mark_for_revalidate(struct inode *inode)
263 struct nfs_inode *nfsi = NFS_I(inode);
265 spin_lock(&inode->i_lock);
266 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
267 if (S_ISDIR(inode->i_mode))
268 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
269 spin_unlock(&inode->i_lock);
272 static inline int nfs_server_capable(struct inode *inode, int cap)
274 return NFS_SERVER(inode)->caps & cap;
277 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
279 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
282 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
284 dentry->d_time = verf;
288 * nfs_save_change_attribute - Returns the inode attribute change cookie
289 * @dir - pointer to parent directory inode
290 * The "change attribute" is updated every time we finish an operation
291 * that will result in a metadata change on the server.
293 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
295 return NFS_I(dir)->cache_change_attribute;
299 * nfs_verify_change_attribute - Detects NFS remote directory changes
300 * @dir - pointer to parent directory inode
301 * @chattr - previously saved change attribute
302 * Return "false" if the verifiers doesn't match the change attribute.
303 * This would usually indicate that the directory contents have changed on
304 * the server, and that any dentries need revalidating.
306 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
308 return chattr == NFS_I(dir)->cache_change_attribute;
312 * linux/fs/nfs/inode.c
314 extern int nfs_sync_mapping(struct address_space *mapping);
315 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
316 extern void nfs_zap_caches(struct inode *);
317 extern void nfs_invalidate_atime(struct inode *);
318 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
320 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
321 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
322 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
323 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
324 extern int nfs_permission(struct inode *, int, struct nameidata *);
325 extern int nfs_open(struct inode *, struct file *);
326 extern int nfs_release(struct inode *, struct file *);
327 extern int nfs_attribute_timeout(struct inode *inode);
328 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
329 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
330 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
331 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
332 extern int nfs_setattr(struct dentry *, struct iattr *);
333 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
334 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
335 extern void put_nfs_open_context(struct nfs_open_context *ctx);
336 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
337 extern u64 nfs_compat_user_ino64(u64 fileid);
339 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
340 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
342 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
345 fattr->time_start = jiffies;
349 * linux/fs/nfs/file.c
351 extern const struct inode_operations nfs_file_inode_operations;
353 extern const struct inode_operations nfs3_file_inode_operations;
354 #endif /* CONFIG_NFS_V3 */
355 extern const struct file_operations nfs_file_operations;
356 extern const struct address_space_operations nfs_file_aops;
358 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
360 return filp->private_data;
363 static inline struct rpc_cred *nfs_file_cred(struct file *file)
366 return nfs_file_open_context(file)->cred;
371 * linux/fs/nfs/xattr.c
373 #ifdef CONFIG_NFS_V3_ACL
374 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
375 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
376 extern int nfs3_setxattr(struct dentry *, const char *,
377 const void *, size_t, int);
378 extern int nfs3_removexattr (struct dentry *, const char *name);
380 # define nfs3_listxattr NULL
381 # define nfs3_getxattr NULL
382 # define nfs3_setxattr NULL
383 # define nfs3_removexattr NULL
387 * linux/fs/nfs/direct.c
389 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
391 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
392 const struct iovec *iov, unsigned long nr_segs,
394 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
395 const struct iovec *iov, unsigned long nr_segs,
401 extern const struct inode_operations nfs_dir_inode_operations;
403 extern const struct inode_operations nfs3_dir_inode_operations;
404 #endif /* CONFIG_NFS_V3 */
405 extern const struct file_operations nfs_dir_operations;
406 extern struct dentry_operations nfs_dentry_operations;
408 extern void nfs_force_lookup_revalidate(struct inode *dir);
409 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
410 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
411 extern void nfs_access_zap_cache(struct inode *inode);
414 * linux/fs/nfs/symlink.c
416 extern const struct inode_operations nfs_symlink_inode_operations;
419 * linux/fs/nfs/sysctl.c
422 extern int nfs_register_sysctl(void);
423 extern void nfs_unregister_sysctl(void);
425 #define nfs_register_sysctl() 0
426 #define nfs_unregister_sysctl() do { } while(0)
430 * linux/fs/nfs/namespace.c
432 extern struct list_head nfs_automount_list;
433 extern const struct inode_operations nfs_mountpoint_inode_operations;
434 extern const struct inode_operations nfs_referral_inode_operations;
435 extern int nfs_mountpoint_expiry_timeout;
436 extern void nfs_release_automount_timer(void);
439 * linux/fs/nfs/unlink.c
441 extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry);
442 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
443 extern void nfs_block_sillyrename(struct dentry *dentry);
444 extern void nfs_unblock_sillyrename(struct dentry *dentry);
447 * linux/fs/nfs/write.c
449 extern int nfs_congestion_kb;
450 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
451 extern int nfs_writepages(struct address_space *, struct writeback_control *);
452 extern int nfs_flush_incompatible(struct file *file, struct page *page);
453 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
454 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
455 extern void nfs_writedata_release(void *);
458 * Try to write back everything synchronously (but check the
461 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
462 extern int nfs_wb_all(struct inode *inode);
463 extern int nfs_wb_nocommit(struct inode *inode);
464 extern int nfs_wb_page(struct inode *inode, struct page* page);
465 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
466 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
467 extern int nfs_commit_inode(struct inode *, int);
468 extern struct nfs_write_data *nfs_commit_alloc(void);
469 extern void nfs_commit_free(struct nfs_write_data *wdata);
470 extern void nfs_commit_release(void *wdata);
473 nfs_commit_inode(struct inode *inode, int how)
480 nfs_have_writebacks(struct inode *inode)
482 return NFS_I(inode)->npages != 0;
486 * Allocate nfs_write_data structures
488 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
491 * linux/fs/nfs/read.c
493 extern int nfs_readpage(struct file *, struct page *);
494 extern int nfs_readpages(struct file *, struct address_space *,
495 struct list_head *, unsigned);
496 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
497 extern void nfs_readdata_release(void *data);
500 * Allocate nfs_read_data structures
502 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
505 * linux/fs/nfs3proc.c
507 #ifdef CONFIG_NFS_V3_ACL
508 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
509 extern int nfs3_proc_setacl(struct inode *inode, int type,
510 struct posix_acl *acl);
511 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
513 extern void nfs3_forget_cached_acls(struct inode *inode);
515 static inline int nfs3_proc_set_default_acl(struct inode *dir,
522 static inline void nfs3_forget_cached_acls(struct inode *inode)
525 #endif /* CONFIG_NFS_V3_ACL */
528 * linux/fs/mount_clnt.c
530 extern int nfs_mount(struct sockaddr *, size_t, char *, char *,
531 int, int, struct nfs_fh *);
537 static inline loff_t nfs_size_to_loff_t(__u64 size)
539 if (size > (__u64) OFFSET_MAX - 1)
540 return OFFSET_MAX - 1;
541 return (loff_t) size;
545 nfs_fileid_to_ino_t(u64 fileid)
547 ino_t ino = (ino_t) fileid;
548 if (sizeof(ino_t) < sizeof(u64))
549 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
555 extern void * nfs_root_data(void);
557 #define nfs_wait_event(clnt, wq, condition) \
560 if (clnt->cl_intr) { \
562 rpc_clnt_sigmask(clnt, &oldmask); \
563 __retval = wait_event_interruptible(wq, condition); \
564 rpc_clnt_sigunmask(clnt, &oldmask); \
566 wait_event(wq, condition); \
570 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
572 #endif /* __KERNEL__ */
577 #define NFSDBG_VFS 0x0001
578 #define NFSDBG_DIRCACHE 0x0002
579 #define NFSDBG_LOOKUPCACHE 0x0004
580 #define NFSDBG_PAGECACHE 0x0008
581 #define NFSDBG_PROC 0x0010
582 #define NFSDBG_XDR 0x0020
583 #define NFSDBG_FILE 0x0040
584 #define NFSDBG_ROOT 0x0080
585 #define NFSDBG_CALLBACK 0x0100
586 #define NFSDBG_CLIENT 0x0200
587 #define NFSDBG_MOUNT 0x0400
588 #define NFSDBG_ALL 0xFFFF
593 * Enable debugging support for nfs client.
594 * Requires RPC_DEBUG.
602 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
604 # define ifdebug(fac) if (0)
606 #endif /* __KERNEL */