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
45 * superblock magic number for NFS
47 #define NFS_SUPER_MAGIC 0x6969
50 * These are the default flags for swap requests
52 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
55 * When flushing a cluster of dirty pages, there can be different
58 #define FLUSH_AGING 0 /* only flush old buffers */
59 #define FLUSH_SYNC 1 /* file being synced, or contention */
60 #define FLUSH_WAIT 2 /* wait for completion */
61 #define FLUSH_STABLE 4 /* commit to stable storage */
62 #define FLUSH_LOWPRI 8 /* low priority background flush */
63 #define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
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 dentry *dentry;
80 struct rpc_cred *cred;
81 struct nfs4_state *state;
86 struct list_head list;
87 wait_queue_head_t waitq;
93 struct nfs_delegation;
96 * nfs fs inode data in memory
100 * The 64bit 'inode number'
115 * read_cache_jiffies is when we started read-caching this inode,
116 * and read_cache_mtime is the mtime of the inode at that time.
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 * and invalidate any cached data/flush out any dirty pages if
129 * mtime != read_cache_mtime
131 unsigned long readdir_timestamp;
132 unsigned long read_cache_jiffies;
133 unsigned long attrtimeo;
134 unsigned long attrtimeo_timestamp;
135 __u64 change_attr; /* v4 only */
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 * Counter indicating the number of outstanding requests that
144 * will cause a file data update.
146 atomic_t data_updates;
148 struct nfs_access_entry cache_access;
151 * This is the cookie verifier used for NFSv3 readdir
157 * This is the list of dirty unwritten pages.
160 struct list_head dirty;
161 struct list_head commit;
162 struct radix_tree_root nfs_page_tree;
168 /* Open contexts for shared mmap writes */
169 struct list_head open_files;
171 wait_queue_head_t nfs_i_wait;
175 struct list_head open_states;
176 struct nfs_delegation *delegation;
177 int delegation_state;
178 struct rw_semaphore rwsem;
179 #endif /* CONFIG_NFS_V4*/
181 struct inode vfs_inode;
185 * Legal inode flag values
187 #define NFS_INO_STALE 0x0001 /* possible stale inode */
188 #define NFS_INO_ADVISE_RDPLUS 0x0002 /* advise readdirplus */
189 #define NFS_INO_REVALIDATING 0x0004 /* revalidating attrs */
190 #define NFS_INO_INVALID_ATTR 0x0008 /* cached attrs are invalid */
191 #define NFS_INO_INVALID_DATA 0x0010 /* cached data is invalid */
192 #define NFS_INO_INVALID_ATIME 0x0020 /* cached atime is invalid */
193 #define NFS_INO_INVALID_ACCESS 0x0040 /* cached access cred invalid */
195 static inline struct nfs_inode *NFS_I(struct inode *inode)
197 return container_of(inode, struct nfs_inode, vfs_inode);
199 #define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
201 #define NFS_FH(inode) (&NFS_I(inode)->fh)
202 #define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
203 #define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
204 #define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
205 #define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
206 #define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
207 #define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
208 #define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
209 #define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
210 #define NFS_MINATTRTIMEO(inode) \
211 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
212 : NFS_SERVER(inode)->acregmin)
213 #define NFS_MAXATTRTIMEO(inode) \
214 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
215 : NFS_SERVER(inode)->acregmax)
216 #define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
218 #define NFS_FLAGS(inode) (NFS_I(inode)->flags)
219 #define NFS_REVALIDATING(inode) (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
220 #define NFS_STALE(inode) (NFS_FLAGS(inode) & NFS_INO_STALE)
222 #define NFS_FILEID(inode) (NFS_I(inode)->fileid)
224 static inline int nfs_caches_unstable(struct inode *inode)
226 return atomic_read(&NFS_I(inode)->data_updates) != 0;
229 static inline void NFS_CACHEINV(struct inode *inode)
231 if (!nfs_caches_unstable(inode))
232 NFS_FLAGS(inode) |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
235 static inline int nfs_server_capable(struct inode *inode, int cap)
237 return NFS_SERVER(inode)->caps & cap;
240 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
242 return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
246 * nfs_save_change_attribute - Returns the inode attribute change cookie
247 * @inode - pointer to inode
248 * The "change attribute" is updated every time we finish an operation
249 * that will result in a metadata change on the server.
251 static inline long nfs_save_change_attribute(struct inode *inode)
253 return NFS_I(inode)->cache_change_attribute;
257 * nfs_verify_change_attribute - Detects NFS inode cache updates
258 * @inode - pointer to inode
259 * @chattr - previously saved change attribute
260 * Return "false" if metadata has been updated (or is in the process of
261 * being updated) since the change attribute was saved.
263 static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
265 return !nfs_caches_unstable(inode)
266 && chattr == NFS_I(inode)->cache_change_attribute;
270 * linux/fs/nfs/inode.c
272 extern void nfs_zap_caches(struct inode *);
273 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
275 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
276 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
277 extern int nfs_permission(struct inode *, int, struct nameidata *);
278 extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
279 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
280 extern int nfs_open(struct inode *, struct file *);
281 extern int nfs_release(struct inode *, struct file *);
282 extern int nfs_attribute_timeout(struct inode *inode);
283 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
284 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
285 extern int nfs_setattr(struct dentry *, struct iattr *);
286 extern void nfs_begin_attr_update(struct inode *);
287 extern void nfs_end_attr_update(struct inode *);
288 extern void nfs_begin_data_update(struct inode *);
289 extern void nfs_end_data_update(struct inode *);
290 extern void nfs_end_data_update_defer(struct inode *);
291 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
292 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
293 extern void put_nfs_open_context(struct nfs_open_context *ctx);
294 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
295 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode);
296 extern void nfs_file_clear_open_context(struct file *filp);
298 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
299 extern u32 root_nfs_parse_addr(char *name); /*__init*/
302 * linux/fs/nfs/file.c
304 extern struct inode_operations nfs_file_inode_operations;
305 extern struct file_operations nfs_file_operations;
306 extern struct address_space_operations nfs_file_aops;
308 static inline struct rpc_cred *nfs_file_cred(struct file *file)
311 struct nfs_open_context *ctx;
313 ctx = (struct nfs_open_context*)file->private_data;
320 * linux/fs/nfs/direct.c
322 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
324 extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
325 size_t count, loff_t pos);
326 extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
327 size_t count, loff_t pos);
332 extern struct inode_operations nfs_dir_inode_operations;
333 extern struct file_operations nfs_dir_operations;
334 extern struct dentry_operations nfs_dentry_operations;
336 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
339 * linux/fs/nfs/symlink.c
341 extern struct inode_operations nfs_symlink_inode_operations;
344 * linux/fs/nfs/unlink.c
346 extern int nfs_async_unlink(struct dentry *);
347 extern void nfs_complete_unlink(struct dentry *);
350 * linux/fs/nfs/write.c
352 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
353 extern int nfs_writepages(struct address_space *, struct writeback_control *);
354 extern int nfs_flush_incompatible(struct file *file, struct page *page);
355 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
356 extern void nfs_writeback_done(struct rpc_task *task);
358 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
359 extern void nfs_commit_done(struct rpc_task *);
363 * Try to write back everything synchronously (but check the
366 extern int nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
367 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
368 extern int nfs_commit_inode(struct inode *, unsigned long, unsigned int, int);
371 nfs_commit_inode(struct inode *inode, unsigned long idx_start, unsigned int npages, int how)
378 nfs_have_writebacks(struct inode *inode)
380 return NFS_I(inode)->npages != 0;
384 nfs_wb_all(struct inode *inode)
386 int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
387 return (error < 0) ? error : 0;
391 * Write back all requests on one page - we do this before reading it.
393 static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
395 int error = nfs_sync_inode(inode, page->index, 1,
396 how | FLUSH_WAIT | FLUSH_STABLE);
397 return (error < 0) ? error : 0;
400 static inline int nfs_wb_page(struct inode *inode, struct page* page)
402 return nfs_wb_page_priority(inode, page, 0);
406 * Allocate and free nfs_write_data structures
408 extern mempool_t *nfs_wdata_mempool;
410 static inline struct nfs_write_data *nfs_writedata_alloc(void)
412 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
414 memset(p, 0, sizeof(*p));
415 INIT_LIST_HEAD(&p->pages);
420 static inline void nfs_writedata_free(struct nfs_write_data *p)
422 mempool_free(p, nfs_wdata_mempool);
426 * linux/fs/nfs/read.c
428 extern int nfs_readpage(struct file *, struct page *);
429 extern int nfs_readpages(struct file *, struct address_space *,
430 struct list_head *, unsigned);
431 extern void nfs_readpage_result(struct rpc_task *);
434 * Allocate and free nfs_read_data structures
436 extern mempool_t *nfs_rdata_mempool;
438 static inline struct nfs_read_data *nfs_readdata_alloc(void)
440 struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
442 memset(p, 0, sizeof(*p));
446 static inline void nfs_readdata_free(struct nfs_read_data *p)
448 mempool_free(p, nfs_rdata_mempool);
451 extern void nfs_readdata_release(struct rpc_task *task);
454 * linux/fs/mount_clnt.c
455 * (Used only by nfsroot module)
457 extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
465 nfs_size_to_loff_t(__u64 size)
467 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
470 return (loff_t) size;
474 nfs_fileid_to_ino_t(u64 fileid)
476 ino_t ino = (ino_t) fileid;
477 if (sizeof(ino_t) < sizeof(u64))
478 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
484 extern void * nfs_root_data(void);
486 #define nfs_wait_event(clnt, wq, condition) \
489 if (clnt->cl_intr) { \
491 rpc_clnt_sigmask(clnt, &oldmask); \
492 __retval = wait_event_interruptible(wq, condition); \
493 rpc_clnt_sigunmask(clnt, &oldmask); \
495 wait_event(wq, condition); \
499 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
501 #endif /* __KERNEL__ */
506 #define NFSDBG_VFS 0x0001
507 #define NFSDBG_DIRCACHE 0x0002
508 #define NFSDBG_LOOKUPCACHE 0x0004
509 #define NFSDBG_PAGECACHE 0x0008
510 #define NFSDBG_PROC 0x0010
511 #define NFSDBG_XDR 0x0020
512 #define NFSDBG_FILE 0x0040
513 #define NFSDBG_ROOT 0x0080
514 #define NFSDBG_CALLBACK 0x0100
515 #define NFSDBG_ALL 0xFFFF
520 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
522 # define ifdebug(fac) if (0)
524 #endif /* __KERNEL */