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 #define NFS_MAX_FILE_IO_BUFFER_SIZE 32768
42 #define NFS_DEF_FILE_IO_BUFFER_SIZE 4096
44 /* Default timeout values */
45 #define NFS_MAX_UDP_TIMEOUT (60*HZ)
46 #define NFS_MAX_TCP_TIMEOUT (600*HZ)
49 * superblock magic number for NFS
51 #define NFS_SUPER_MAGIC 0x6969
54 * These are the default flags for swap requests
56 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
59 * When flushing a cluster of dirty pages, there can be different
62 #define FLUSH_AGING 0 /* only flush old buffers */
63 #define FLUSH_SYNC 1 /* file being synced, or contention */
64 #define FLUSH_WAIT 2 /* wait for completion */
65 #define FLUSH_STABLE 4 /* commit to stable storage */
66 #define FLUSH_LOWPRI 8 /* low priority background flush */
67 #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
72 * NFSv3/v4 Access mode cache entry
74 struct nfs_access_entry {
75 unsigned long jiffies;
76 struct rpc_cred * cred;
81 struct nfs_open_context {
83 struct dentry *dentry;
84 struct rpc_cred *cred;
85 struct nfs4_state *state;
90 struct list_head list;
98 struct nfs_delegation;
103 * nfs fs inode data in memory
107 * The 64bit 'inode number'
119 unsigned long flags; /* atomic bit ops */
120 unsigned long cache_validity; /* bit mask */
123 * read_cache_jiffies is when we started read-caching this inode,
124 * and read_cache_mtime is the mtime of the inode at that time.
125 * attrtimeo is for how long the cached information is assumed
126 * to be valid. A successful attribute revalidation doubles
127 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
130 * We need to revalidate the cached attrs for this inode if
132 * jiffies - read_cache_jiffies > attrtimeo
134 * and invalidate any cached data/flush out any dirty pages if
137 * mtime != read_cache_mtime
139 unsigned long read_cache_jiffies;
140 unsigned long attrtimeo;
141 unsigned long attrtimeo_timestamp;
142 __u64 change_attr; /* v4 only */
144 unsigned long last_updated;
145 /* "Generation counter" for the attribute cache. This is
146 * bumped whenever we update the metadata on the
149 unsigned long cache_change_attribute;
151 * Counter indicating the number of outstanding requests that
152 * will cause a file data update.
154 atomic_t data_updates;
156 struct nfs_access_entry cache_access;
157 #ifdef CONFIG_NFS_V3_ACL
158 struct posix_acl *acl_access;
159 struct posix_acl *acl_default;
163 * This is the cookie verifier used for NFSv3 readdir
169 * This is the list of dirty unwritten pages.
172 struct list_head dirty;
173 struct list_head commit;
174 struct radix_tree_root nfs_page_tree;
180 /* Open contexts for shared mmap writes */
181 struct list_head open_files;
184 struct nfs4_cached_acl *nfs4_acl;
186 struct list_head open_states;
187 struct nfs_delegation *delegation;
188 int delegation_state;
189 struct rw_semaphore rwsem;
190 #endif /* CONFIG_NFS_V4*/
191 struct inode vfs_inode;
195 * Cache validity bit flags
197 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
198 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
199 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
200 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
201 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
202 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
205 * Bit offsets in flags field
207 #define NFS_INO_REVALIDATING (0) /* revalidating attrs */
208 #define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
209 #define NFS_INO_STALE (2) /* possible stale inode */
211 static inline struct nfs_inode *NFS_I(struct inode *inode)
213 return container_of(inode, struct nfs_inode, vfs_inode);
215 #define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
217 #define NFS_FH(inode) (&NFS_I(inode)->fh)
218 #define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
219 #define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
220 #define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
221 #define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
222 #define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
223 #define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
224 #define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
225 #define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
226 #define NFS_MINATTRTIMEO(inode) \
227 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
228 : NFS_SERVER(inode)->acregmin)
229 #define NFS_MAXATTRTIMEO(inode) \
230 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
231 : NFS_SERVER(inode)->acregmax)
232 #define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
234 #define NFS_FLAGS(inode) (NFS_I(inode)->flags)
235 #define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
237 #define NFS_FILEID(inode) (NFS_I(inode)->fileid)
239 static inline int nfs_caches_unstable(struct inode *inode)
241 return atomic_read(&NFS_I(inode)->data_updates) != 0;
244 static inline void nfs_mark_for_revalidate(struct inode *inode)
246 spin_lock(&inode->i_lock);
247 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
248 spin_unlock(&inode->i_lock);
251 static inline void NFS_CACHEINV(struct inode *inode)
253 if (!nfs_caches_unstable(inode))
254 nfs_mark_for_revalidate(inode);
257 static inline int nfs_server_capable(struct inode *inode, int cap)
259 return NFS_SERVER(inode)->caps & cap;
262 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
264 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
268 * nfs_save_change_attribute - Returns the inode attribute change cookie
269 * @inode - pointer to inode
270 * The "change attribute" is updated every time we finish an operation
271 * that will result in a metadata change on the server.
273 static inline long nfs_save_change_attribute(struct inode *inode)
275 return NFS_I(inode)->cache_change_attribute;
279 * nfs_verify_change_attribute - Detects NFS inode cache updates
280 * @inode - pointer to inode
281 * @chattr - previously saved change attribute
282 * Return "false" if metadata has been updated (or is in the process of
283 * being updated) since the change attribute was saved.
285 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
287 return !nfs_caches_unstable(inode)
288 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
292 * linux/fs/nfs/inode.c
294 extern void nfs_zap_caches(struct inode *);
295 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
297 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
298 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
299 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
300 extern int nfs_permission(struct inode *, int, struct nameidata *);
301 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
302 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
303 extern int nfs_open(struct inode *, struct file *);
304 extern int nfs_release(struct inode *, struct file *);
305 extern int nfs_attribute_timeout(struct inode *inode);
306 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
307 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
308 extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
309 extern int nfs_setattr(struct dentry *, struct iattr *);
310 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
311 extern void nfs_begin_attr_update(struct inode *);
312 extern void nfs_end_attr_update(struct inode *);
313 extern void nfs_begin_data_update(struct inode *);
314 extern void nfs_end_data_update(struct inode *);
315 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
316 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
317 extern void put_nfs_open_context(struct nfs_open_context *ctx);
318 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
319 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
320 extern void nfs_file_clear_open_context(struct file *filp);
322 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
323 extern u32 root_nfs_parse_addr(char *name); /*__init*/
325 static inline void nfs_fattr_init(struct nfs_fattr *fattr)
328 fattr->time_start = jiffies;
332 * linux/fs/nfs/file.c
334 extern struct inode_operations nfs_file_inode_operations;
336 extern struct inode_operations nfs3_file_inode_operations;
337 #endif /* CONFIG_NFS_V3 */
338 extern struct file_operations nfs_file_operations;
339 extern struct address_space_operations nfs_file_aops;
341 static inline struct rpc_cred *nfs_file_cred(struct file *file)
344 struct nfs_open_context *ctx;
346 ctx = (struct nfs_open_context*)file->private_data;
353 * linux/fs/nfs/xattr.c
355 #ifdef CONFIG_NFS_V3_ACL
356 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
357 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
358 extern int nfs3_setxattr(struct dentry *, const char *,
359 const void *, size_t, int);
360 extern int nfs3_removexattr (struct dentry *, const char *name);
362 # define nfs3_listxattr NULL
363 # define nfs3_getxattr NULL
364 # define nfs3_setxattr NULL
365 # define nfs3_removexattr NULL
369 * linux/fs/nfs/direct.c
371 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
373 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
374 size_t count, loff_t pos);
375 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
376 size_t count, loff_t pos);
381 extern struct inode_operations nfs_dir_inode_operations;
383 extern struct inode_operations nfs3_dir_inode_operations;
384 #endif /* CONFIG_NFS_V3 */
385 extern struct file_operations nfs_dir_operations;
386 extern struct dentry_operations nfs_dentry_operations;
388 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
391 * linux/fs/nfs/symlink.c
393 extern struct inode_operations nfs_symlink_inode_operations;
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 void nfs_writeback_done(struct rpc_task *task);
410 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
411 extern void nfs_commit_done(struct rpc_task *);
415 * Try to write back everything synchronously (but check the
418 extern int nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
419 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
420 extern int nfs_commit_inode(struct inode *, int);
423 nfs_commit_inode(struct inode *inode, int how)
430 nfs_have_writebacks(struct inode *inode)
432 return NFS_I(inode)->npages != 0;
436 nfs_wb_all(struct inode *inode)
438 int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
439 return (error < 0) ? error : 0;
443 * Write back all requests on one page - we do this before reading it.
445 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
447 int error = nfs_sync_inode(inode, page->index, 1,
448 how | FLUSH_WAIT | FLUSH_STABLE);
449 return (error < 0) ? error : 0;
452 static inline int nfs_wb_page(struct inode *inode, struct page* page)
454 return nfs_wb_page_priority(inode, page, 0);
458 * Allocate and free nfs_write_data structures
460 extern mempool_t *nfs_wdata_mempool;
462 static inline struct nfs_write_data *nfs_writedata_alloc(void)
464 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
466 memset(p, 0, sizeof(*p));
467 INIT_LIST_HEAD(&p->pages);
472 static inline void nfs_writedata_free(struct nfs_write_data *p)
474 mempool_free(p, nfs_wdata_mempool);
478 * linux/fs/nfs/read.c
480 extern int nfs_readpage(struct file *, struct page *);
481 extern int nfs_readpages(struct file *, struct address_space *,
482 struct list_head *, unsigned);
483 extern void nfs_readpage_result(struct rpc_task *);
486 * Allocate and free nfs_read_data structures
488 extern mempool_t *nfs_rdata_mempool;
490 static inline struct nfs_read_data *nfs_readdata_alloc(void)
492 struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
494 memset(p, 0, sizeof(*p));
498 static inline void nfs_readdata_free(struct nfs_read_data *p)
500 mempool_free(p, nfs_rdata_mempool);
503 extern void nfs_readdata_release(struct rpc_task *task);
506 * linux/fs/nfs3proc.c
508 #ifdef CONFIG_NFS_V3_ACL
509 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
510 extern int nfs3_proc_setacl(struct inode *inode, int type,
511 struct posix_acl *acl);
512 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
514 extern void nfs3_forget_cached_acls(struct inode *inode);
516 static inline int nfs3_proc_set_default_acl(struct inode *dir,
523 static inline void nfs3_forget_cached_acls(struct inode *inode)
526 #endif /* CONFIG_NFS_V3_ACL */
529 * linux/fs/mount_clnt.c
530 * (Used only by nfsroot module)
532 extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
540 nfs_size_to_loff_t(__u64 size)
542 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
545 return (loff_t) size;
549 nfs_fileid_to_ino_t(u64 fileid)
551 ino_t ino = (ino_t) fileid;
552 if (sizeof(ino_t) < sizeof(u64))
553 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
559 extern void * nfs_root_data(void);
561 #define nfs_wait_event(clnt, wq, condition) \
564 if (clnt->cl_intr) { \
566 rpc_clnt_sigmask(clnt, &oldmask); \
567 __retval = wait_event_interruptible(wq, condition); \
568 rpc_clnt_sigunmask(clnt, &oldmask); \
570 wait_event(wq, condition); \
574 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
576 #endif /* __KERNEL__ */
581 #define NFSDBG_VFS 0x0001
582 #define NFSDBG_DIRCACHE 0x0002
583 #define NFSDBG_LOOKUPCACHE 0x0004
584 #define NFSDBG_PAGECACHE 0x0008
585 #define NFSDBG_PROC 0x0010
586 #define NFSDBG_XDR 0x0020
587 #define NFSDBG_FILE 0x0040
588 #define NFSDBG_ROOT 0x0080
589 #define NFSDBG_CALLBACK 0x0100
590 #define NFSDBG_ALL 0xFFFF
595 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
597 # define ifdebug(fac) if (0)
599 #endif /* __KERNEL */