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)
24 * When flushing a cluster of dirty pages, there can be different
27 #define FLUSH_SYNC 1 /* file being synced, or contention */
28 #define FLUSH_STABLE 4 /* commit to stable storage */
29 #define FLUSH_LOWPRI 8 /* low priority background flush */
30 #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
31 #define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
32 #define FLUSH_INVALIDATE 64 /* Invalidate the page cache */
33 #define FLUSH_NOWRITEPAGE 128 /* Don't call writepage() */
38 #include <linux/kref.h>
40 #include <linux/namei.h>
41 #include <linux/pagemap.h>
42 #include <linux/rbtree.h>
43 #include <linux/rwsem.h>
44 #include <linux/wait.h>
46 #include <linux/sunrpc/debug.h>
47 #include <linux/sunrpc/auth.h>
48 #include <linux/sunrpc/clnt.h>
50 #include <linux/nfs.h>
51 #include <linux/nfs2.h>
52 #include <linux/nfs3.h>
53 #include <linux/nfs4.h>
54 #include <linux/nfs_xdr.h>
55 #include <linux/nfs_fs_sb.h>
57 #include <linux/mempool.h>
60 * These are the default flags for swap requests
62 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
65 * NFSv3/v4 Access mode cache entry
67 struct nfs_access_entry {
68 struct rb_node rb_node;
70 unsigned long jiffies;
71 struct rpc_cred * cred;
76 struct nfs_open_context {
79 struct rpc_cred *cred;
80 struct nfs4_state *state;
85 #define NFS_CONTEXT_ERROR_WRITE (0)
88 struct list_head list;
96 struct nfs_delegation;
101 * nfs fs inode data in memory
105 * The 64bit 'inode number'
117 unsigned long flags; /* atomic bit ops */
118 unsigned long cache_validity; /* bit mask */
121 * read_cache_jiffies is when we started read-caching this inode.
122 * attrtimeo is for how long the cached information is assumed
123 * to be valid. A successful attribute revalidation doubles
124 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
127 * We need to revalidate the cached attrs for this inode if
129 * jiffies - read_cache_jiffies > attrtimeo
131 unsigned long read_cache_jiffies;
132 unsigned long attrtimeo;
133 unsigned long attrtimeo_timestamp;
134 __u64 change_attr; /* v4 only */
136 unsigned long last_updated;
137 /* "Generation counter" for the attribute cache. This is
138 * bumped whenever we update the metadata on the
141 unsigned long cache_change_attribute;
143 struct rb_root access_cache;
144 struct list_head access_cache_entry_lru;
145 struct list_head access_cache_inode_lru;
146 #ifdef CONFIG_NFS_V3_ACL
147 struct posix_acl *acl_access;
148 struct posix_acl *acl_default;
152 * This is the cookie verifier used for NFSv3 readdir
155 __be32 cookieverf[2];
158 * This is the list of dirty unwritten pages.
160 struct radix_tree_root nfs_page_tree;
162 unsigned long ncommit,
165 /* Open contexts for shared mmap writes */
166 struct list_head open_files;
168 /* Number of in-flight sillydelete RPC calls */
169 atomic_t silly_count;
170 /* List of deferred sillydelete requests */
171 struct hlist_head silly_list;
172 wait_queue_head_t waitqueue;
175 struct nfs4_cached_acl *nfs4_acl;
177 struct list_head open_states;
178 struct nfs_delegation *delegation;
179 int delegation_state;
180 struct rw_semaphore rwsem;
181 #endif /* CONFIG_NFS_V4*/
182 struct inode vfs_inode;
186 * Cache validity bit flags
188 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
189 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
190 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
191 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
192 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
193 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
194 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
197 * Bit offsets in flags field
199 #define NFS_INO_REVALIDATING (0) /* revalidating attrs */
200 #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
201 #define NFS_INO_STALE (2) /* possible stale inode */
202 #define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
203 #define NFS_INO_MOUNTPOINT (4) /* inode is remote mountpoint */
205 static inline struct nfs_inode *NFS_I(const struct inode *inode)
207 return container_of(inode, struct nfs_inode, vfs_inode);
210 static inline struct nfs_server *NFS_SB(const struct super_block *s)
212 return (struct nfs_server *)(s->s_fs_info);
215 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
217 return &NFS_I(inode)->fh;
220 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
222 return NFS_SB(inode->i_sb);
225 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
227 return NFS_SERVER(inode)->client;
230 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
232 return NFS_SERVER(inode)->nfs_client->rpc_ops;
235 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
237 return NFS_I(inode)->cookieverf;
240 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
242 struct nfs_server *nfss = NFS_SERVER(inode);
243 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
246 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
248 struct nfs_server *nfss = NFS_SERVER(inode);
249 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
252 static inline int NFS_STALE(const struct inode *inode)
254 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
257 static inline __u64 NFS_FILEID(const struct inode *inode)
259 return NFS_I(inode)->fileid;
262 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
264 NFS_I(inode)->fileid = fileid;
267 static inline void nfs_mark_for_revalidate(struct inode *inode)
269 struct nfs_inode *nfsi = NFS_I(inode);
271 spin_lock(&inode->i_lock);
272 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
273 if (S_ISDIR(inode->i_mode))
274 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
275 spin_unlock(&inode->i_lock);
278 static inline int nfs_server_capable(struct inode *inode, int cap)
280 return NFS_SERVER(inode)->caps & cap;
283 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
285 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
288 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
290 dentry->d_time = verf;
294 * nfs_save_change_attribute - Returns the inode attribute change cookie
295 * @dir - pointer to parent directory inode
296 * The "change attribute" is updated every time we finish an operation
297 * that will result in a metadata change on the server.
299 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
301 return NFS_I(dir)->cache_change_attribute;
305 * nfs_verify_change_attribute - Detects NFS remote directory changes
306 * @dir - pointer to parent directory inode
307 * @chattr - previously saved change attribute
308 * Return "false" if the verifiers doesn't match the change attribute.
309 * This would usually indicate that the directory contents have changed on
310 * the server, and that any dentries need revalidating.
312 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
314 return chattr == NFS_I(dir)->cache_change_attribute;
318 * linux/fs/nfs/inode.c
320 extern int nfs_sync_mapping(struct address_space *mapping);
321 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
322 extern void nfs_zap_caches(struct inode *);
323 extern void nfs_invalidate_atime(struct inode *);
324 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
326 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
327 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
328 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
329 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
330 extern int nfs_permission(struct inode *, int, struct nameidata *);
331 extern int nfs_open(struct inode *, struct file *);
332 extern int nfs_release(struct inode *, struct file *);
333 extern int nfs_attribute_timeout(struct inode *inode);
334 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
335 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
336 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
337 extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
338 extern int nfs_setattr(struct dentry *, struct iattr *);
339 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
340 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
341 extern void put_nfs_open_context(struct nfs_open_context *ctx);
342 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
343 extern u64 nfs_compat_user_ino64(u64 fileid);
345 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
346 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
348 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
351 fattr->time_start = jiffies;
355 * linux/fs/nfs/file.c
357 extern const struct inode_operations nfs_file_inode_operations;
359 extern const struct inode_operations nfs3_file_inode_operations;
360 #endif /* CONFIG_NFS_V3 */
361 extern const struct file_operations nfs_file_operations;
362 extern const struct address_space_operations nfs_file_aops;
364 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
366 return filp->private_data;
369 static inline struct rpc_cred *nfs_file_cred(struct file *file)
372 return nfs_file_open_context(file)->cred;
377 * linux/fs/nfs/xattr.c
379 #ifdef CONFIG_NFS_V3_ACL
380 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
381 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
382 extern int nfs3_setxattr(struct dentry *, const char *,
383 const void *, size_t, int);
384 extern int nfs3_removexattr (struct dentry *, const char *name);
386 # define nfs3_listxattr NULL
387 # define nfs3_getxattr NULL
388 # define nfs3_setxattr NULL
389 # define nfs3_removexattr NULL
393 * linux/fs/nfs/direct.c
395 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
397 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
398 const struct iovec *iov, unsigned long nr_segs,
400 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
401 const struct iovec *iov, unsigned long nr_segs,
407 extern const struct inode_operations nfs_dir_inode_operations;
409 extern const struct inode_operations nfs3_dir_inode_operations;
410 #endif /* CONFIG_NFS_V3 */
411 extern const struct file_operations nfs_dir_operations;
412 extern struct dentry_operations nfs_dentry_operations;
414 extern void nfs_force_lookup_revalidate(struct inode *dir);
415 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
416 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
417 extern void nfs_access_zap_cache(struct inode *inode);
420 * linux/fs/nfs/symlink.c
422 extern const struct inode_operations nfs_symlink_inode_operations;
425 * linux/fs/nfs/sysctl.c
428 extern int nfs_register_sysctl(void);
429 extern void nfs_unregister_sysctl(void);
431 #define nfs_register_sysctl() 0
432 #define nfs_unregister_sysctl() do { } while(0)
436 * linux/fs/nfs/namespace.c
438 extern const struct inode_operations nfs_mountpoint_inode_operations;
439 extern const struct inode_operations nfs_referral_inode_operations;
440 extern int nfs_mountpoint_expiry_timeout;
441 extern void nfs_release_automount_timer(void);
444 * linux/fs/nfs/unlink.c
446 extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry);
447 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
448 extern void nfs_block_sillyrename(struct dentry *dentry);
449 extern void nfs_unblock_sillyrename(struct dentry *dentry);
452 * linux/fs/nfs/write.c
454 extern int nfs_congestion_kb;
455 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
456 extern int nfs_writepages(struct address_space *, struct writeback_control *);
457 extern int nfs_flush_incompatible(struct file *file, struct page *page);
458 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
459 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
460 extern void nfs_writedata_release(void *);
463 * Try to write back everything synchronously (but check the
466 extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
467 extern int nfs_wb_all(struct inode *inode);
468 extern int nfs_wb_nocommit(struct inode *inode);
469 extern int nfs_wb_page(struct inode *inode, struct page* page);
470 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
471 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
472 extern int nfs_commit_inode(struct inode *, int);
473 extern struct nfs_write_data *nfs_commitdata_alloc(void);
474 extern void nfs_commit_free(struct nfs_write_data *wdata);
475 extern void nfs_commitdata_release(void *wdata);
478 nfs_commit_inode(struct inode *inode, int how)
485 nfs_have_writebacks(struct inode *inode)
487 return NFS_I(inode)->npages != 0;
491 * Allocate nfs_write_data structures
493 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
496 * linux/fs/nfs/read.c
498 extern int nfs_readpage(struct file *, struct page *);
499 extern int nfs_readpages(struct file *, struct address_space *,
500 struct list_head *, unsigned);
501 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
502 extern void nfs_readdata_release(void *data);
505 * Allocate nfs_read_data structures
507 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
510 * linux/fs/nfs3proc.c
512 #ifdef CONFIG_NFS_V3_ACL
513 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
514 extern int nfs3_proc_setacl(struct inode *inode, int type,
515 struct posix_acl *acl);
516 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
518 extern void nfs3_forget_cached_acls(struct inode *inode);
520 static inline int nfs3_proc_set_default_acl(struct inode *dir,
527 static inline void nfs3_forget_cached_acls(struct inode *inode)
530 #endif /* CONFIG_NFS_V3_ACL */
533 * linux/fs/mount_clnt.c
535 extern int nfs_mount(struct sockaddr *, size_t, char *, char *,
536 int, int, struct nfs_fh *);
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 */