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/config.h>
15 #include <linux/pagemap.h>
16 #include <linux/rwsem.h>
17 #include <linux/wait.h>
19 #include <linux/nfs_fs_sb.h>
21 #include <linux/sunrpc/debug.h>
22 #include <linux/sunrpc/auth.h>
23 #include <linux/sunrpc/clnt.h>
25 #include <linux/nfs.h>
26 #include <linux/nfs2.h>
27 #include <linux/nfs3.h>
28 #include <linux/nfs4.h>
29 #include <linux/nfs_xdr.h>
30 #include <linux/rwsem.h>
31 #include <linux/mempool.h>
34 * Enable debugging support for nfs client.
41 /* Default timeout values */
42 #define NFS_MAX_UDP_TIMEOUT (60*HZ)
43 #define NFS_MAX_TCP_TIMEOUT (600*HZ)
46 * superblock magic number for NFS
48 #define NFS_SUPER_MAGIC 0x6969
51 * These are the default flags for swap requests
53 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
56 * When flushing a cluster of dirty pages, there can be different
59 #define FLUSH_SYNC 1 /* file being synced, or contention */
60 #define FLUSH_STABLE 4 /* commit to stable storage */
61 #define FLUSH_LOWPRI 8 /* low priority background flush */
62 #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
63 #define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
68 * NFSv3/v4 Access mode cache entry
70 struct nfs_access_entry {
71 unsigned long jiffies;
72 struct rpc_cred * cred;
77 struct nfs_open_context {
79 struct vfsmount *vfsmnt;
80 struct dentry *dentry;
81 struct rpc_cred *cred;
82 struct nfs4_state *state;
87 struct list_head list;
95 struct nfs_delegation;
100 * nfs fs inode data in memory
104 * The 64bit 'inode number'
116 unsigned long flags; /* atomic bit ops */
117 unsigned long cache_validity; /* bit mask */
120 * read_cache_jiffies is when we started read-caching this inode.
121 * attrtimeo is for how long the cached information is assumed
122 * to be valid. A successful attribute revalidation doubles
123 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
126 * We need to revalidate the cached attrs for this inode if
128 * jiffies - read_cache_jiffies > attrtimeo
130 unsigned long read_cache_jiffies;
131 unsigned long attrtimeo;
132 unsigned long attrtimeo_timestamp;
133 __u64 change_attr; /* v4 only */
135 unsigned long last_updated;
136 /* "Generation counter" for the attribute cache. This is
137 * bumped whenever we update the metadata on the
140 unsigned long cache_change_attribute;
142 * Counter indicating the number of outstanding requests that
143 * will cause a file data update.
145 atomic_t data_updates;
147 struct nfs_access_entry cache_access;
148 #ifdef CONFIG_NFS_V3_ACL
149 struct posix_acl *acl_access;
150 struct posix_acl *acl_default;
154 * This is the cookie verifier used for NFSv3 readdir
160 * This is the list of dirty unwritten pages.
163 struct list_head dirty;
164 struct list_head commit;
165 struct radix_tree_root nfs_page_tree;
171 /* Open contexts for shared mmap writes */
172 struct list_head open_files;
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 */
196 * Bit offsets in flags field
198 #define NFS_INO_REVALIDATING (0) /* revalidating attrs */
199 #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
200 #define NFS_INO_STALE (2) /* possible stale inode */
202 static inline struct nfs_inode *NFS_I(struct inode *inode)
204 return container_of(inode, struct nfs_inode, vfs_inode);
206 #define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
208 #define NFS_FH(inode) (&NFS_I(inode)->fh)
209 #define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
210 #define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
211 #define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
212 #define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
213 #define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
214 #define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
215 #define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
216 #define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
217 #define NFS_MINATTRTIMEO(inode) \
218 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
219 : NFS_SERVER(inode)->acregmin)
220 #define NFS_MAXATTRTIMEO(inode) \
221 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
222 : NFS_SERVER(inode)->acregmax)
223 #define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
225 #define NFS_FLAGS(inode) (NFS_I(inode)->flags)
226 #define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
228 #define NFS_FILEID(inode) (NFS_I(inode)->fileid)
230 static inline int nfs_caches_unstable(struct inode *inode)
232 return atomic_read(&NFS_I(inode)->data_updates) != 0;
235 static inline void nfs_mark_for_revalidate(struct inode *inode)
237 spin_lock(&inode->i_lock);
238 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
239 spin_unlock(&inode->i_lock);
242 static inline void NFS_CACHEINV(struct inode *inode)
244 if (!nfs_caches_unstable(inode))
245 nfs_mark_for_revalidate(inode);
248 static inline int nfs_server_capable(struct inode *inode, int cap)
250 return NFS_SERVER(inode)->caps & cap;
253 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
255 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
259 * nfs_save_change_attribute - Returns the inode attribute change cookie
260 * @inode - pointer to inode
261 * The "change attribute" is updated every time we finish an operation
262 * that will result in a metadata change on the server.
264 static inline long nfs_save_change_attribute(struct inode *inode)
266 return NFS_I(inode)->cache_change_attribute;
270 * nfs_verify_change_attribute - Detects NFS inode cache updates
271 * @inode - pointer to inode
272 * @chattr - previously saved change attribute
273 * Return "false" if metadata has been updated (or is in the process of
274 * being updated) since the change attribute was saved.
276 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
278 return !nfs_caches_unstable(inode)
279 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
283 * linux/fs/nfs/inode.c
285 extern int nfs_sync_mapping(struct address_space *mapping);
286 extern void nfs_zap_caches(struct inode *);
287 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
289 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
290 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
291 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
292 extern int nfs_permission(struct inode *, int, struct nameidata *);
293 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
294 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
295 extern int nfs_open(struct inode *, struct file *);
296 extern int nfs_release(struct inode *, struct file *);
297 extern int nfs_attribute_timeout(struct inode *inode);
298 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
299 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
300 extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
301 extern int nfs_setattr(struct dentry *, struct iattr *);
302 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
303 extern void nfs_begin_attr_update(struct inode *);
304 extern void nfs_end_attr_update(struct inode *);
305 extern void nfs_begin_data_update(struct inode *);
306 extern void nfs_end_data_update(struct inode *);
307 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
308 extern void put_nfs_open_context(struct nfs_open_context *ctx);
309 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
311 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
312 extern u32 root_nfs_parse_addr(char *name); /*__init*/
314 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
317 fattr->time_start = jiffies;
321 * linux/fs/nfs/file.c
323 extern struct inode_operations nfs_file_inode_operations;
325 extern struct inode_operations nfs3_file_inode_operations;
326 #endif /* CONFIG_NFS_V3 */
327 extern const struct file_operations nfs_file_operations;
328 extern struct address_space_operations nfs_file_aops;
330 static inline struct rpc_cred *nfs_file_cred(struct file *file)
333 struct nfs_open_context *ctx;
335 ctx = (struct nfs_open_context*)file->private_data;
342 * linux/fs/nfs/xattr.c
344 #ifdef CONFIG_NFS_V3_ACL
345 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
346 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
347 extern int nfs3_setxattr(struct dentry *, const char *,
348 const void *, size_t, int);
349 extern int nfs3_removexattr (struct dentry *, const char *name);
351 # define nfs3_listxattr NULL
352 # define nfs3_getxattr NULL
353 # define nfs3_setxattr NULL
354 # define nfs3_removexattr NULL
358 * linux/fs/nfs/direct.c
360 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
362 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
363 size_t count, loff_t pos);
364 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
365 size_t count, loff_t pos);
370 extern struct inode_operations nfs_dir_inode_operations;
372 extern struct inode_operations nfs3_dir_inode_operations;
373 #endif /* CONFIG_NFS_V3 */
374 extern const struct file_operations nfs_dir_operations;
375 extern struct dentry_operations nfs_dentry_operations;
377 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
380 * linux/fs/nfs/symlink.c
382 extern struct inode_operations nfs_symlink_inode_operations;
385 * linux/fs/nfs/sysctl.c
388 extern int nfs_register_sysctl(void);
389 extern void nfs_unregister_sysctl(void);
391 #define nfs_register_sysctl() 0
392 #define nfs_unregister_sysctl() do { } while(0)
396 * linux/fs/nfs/unlink.c
398 extern int nfs_async_unlink(struct dentry *);
399 extern void nfs_complete_unlink(struct dentry *);
402 * linux/fs/nfs/write.c
404 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
405 extern int nfs_writepages(struct address_space *, struct writeback_control *);
406 extern int nfs_flush_incompatible(struct file *file, struct page *page);
407 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
408 extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
409 extern void nfs_writedata_release(void *);
411 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
412 struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
413 void nfs_commit_free(struct nfs_write_data *p);
417 * Try to write back everything synchronously (but check the
420 extern int nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
421 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
422 extern int nfs_commit_inode(struct inode *, int);
423 extern void nfs_commit_release(void *wdata);
426 nfs_commit_inode(struct inode *inode, int how)
433 nfs_have_writebacks(struct inode *inode)
435 return NFS_I(inode)->npages != 0;
439 nfs_wb_all(struct inode *inode)
441 int error = nfs_sync_inode_wait(inode, 0, 0, 0);
442 return (error < 0) ? error : 0;
446 * Write back all requests on one page - we do this before reading it.
448 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
450 int error = nfs_sync_inode_wait(inode, page->index, 1,
452 return (error < 0) ? error : 0;
455 static inline int nfs_wb_page(struct inode *inode, struct page* page)
457 return nfs_wb_page_priority(inode, page, 0);
461 * Allocate and free nfs_write_data structures
463 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount);
464 extern void nfs_writedata_free(struct nfs_write_data *p);
467 * linux/fs/nfs/read.c
469 extern int nfs_readpage(struct file *, struct page *);
470 extern int nfs_readpages(struct file *, struct address_space *,
471 struct list_head *, unsigned);
472 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
473 extern void nfs_readdata_release(void *data);
476 * Allocate and free nfs_read_data structures
478 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount);
479 extern void nfs_readdata_free(struct nfs_read_data *p);
482 * linux/fs/nfs3proc.c
484 #ifdef CONFIG_NFS_V3_ACL
485 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
486 extern int nfs3_proc_setacl(struct inode *inode, int type,
487 struct posix_acl *acl);
488 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
490 extern void nfs3_forget_cached_acls(struct inode *inode);
492 static inline int nfs3_proc_set_default_acl(struct inode *dir,
499 static inline void nfs3_forget_cached_acls(struct inode *inode)
502 #endif /* CONFIG_NFS_V3_ACL */
505 * linux/fs/mount_clnt.c
506 * (Used only by nfsroot module)
508 extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
516 nfs_size_to_loff_t(__u64 size)
518 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
521 return (loff_t) size;
525 nfs_fileid_to_ino_t(u64 fileid)
527 ino_t ino = (ino_t) fileid;
528 if (sizeof(ino_t) < sizeof(u64))
529 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
535 extern void * nfs_root_data(void);
537 #define nfs_wait_event(clnt, wq, condition) \
540 if (clnt->cl_intr) { \
542 rpc_clnt_sigmask(clnt, &oldmask); \
543 __retval = wait_event_interruptible(wq, condition); \
544 rpc_clnt_sigunmask(clnt, &oldmask); \
546 wait_event(wq, condition); \
550 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
552 #endif /* __KERNEL__ */
557 #define NFSDBG_VFS 0x0001
558 #define NFSDBG_DIRCACHE 0x0002
559 #define NFSDBG_LOOKUPCACHE 0x0004
560 #define NFSDBG_PAGECACHE 0x0008
561 #define NFSDBG_PROC 0x0010
562 #define NFSDBG_XDR 0x0020
563 #define NFSDBG_FILE 0x0040
564 #define NFSDBG_ROOT 0x0080
565 #define NFSDBG_CALLBACK 0x0100
566 #define NFSDBG_ALL 0xFFFF
571 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
573 # define ifdebug(fac) if (0)
575 #endif /* __KERNEL */