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/wait.h>
17 #include <linux/uio.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_page.h>
30 #include <linux/nfs_xdr.h>
33 * Enable debugging support for nfs client.
40 #define NFS_MAX_FILE_IO_BUFFER_SIZE 32768
41 #define NFS_DEF_FILE_IO_BUFFER_SIZE 4096
44 * The upper limit on timeouts for the exponential backoff algorithm.
46 #define NFS_WRITEBACK_DELAY (5*HZ)
47 #define NFS_WRITEBACK_LOCKDELAY (60*HZ)
48 #define NFS_COMMIT_DELAY (5*HZ)
51 * superblock magic number for NFS
53 #define NFS_SUPER_MAGIC 0x6969
56 * These are the default flags for swap requests
58 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
60 #define NFS_RW_SYNC 0x0001 /* O_SYNC handling */
61 #define NFS_RW_SWAP 0x0002 /* This is a swap request */
64 * When flushing a cluster of dirty pages, there can be different
67 #define FLUSH_AGING 0 /* only flush old buffers */
68 #define FLUSH_SYNC 1 /* file being synced, or contention */
69 #define FLUSH_WAIT 2 /* wait for completion */
70 #define FLUSH_STABLE 4 /* commit to stable storage */
75 * NFSv3 Access mode cache
77 struct nfs_access_cache {
78 unsigned long jiffies;
79 struct rpc_cred * cred;
85 * nfs fs inode data in memory
89 * The 64bit 'inode number'
101 unsigned short flags;
104 * read_cache_jiffies is when we started read-caching this inode,
105 * and read_cache_mtime is the mtime of the inode at that time.
106 * attrtimeo is for how long the cached information is assumed
107 * to be valid. A successful attribute revalidation doubles
108 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
111 * We need to revalidate the cached attrs for this inode if
113 * jiffies - read_cache_jiffies > attrtimeo
115 * and invalidate any cached data/flush out any dirty pages if
118 * mtime != read_cache_mtime
120 unsigned long read_cache_jiffies;
121 struct timespec read_cache_ctime;
122 struct timespec read_cache_mtime;
123 __u64 read_cache_isize;
124 unsigned long attrtimeo;
125 unsigned long attrtimeo_timestamp;
126 __u64 change_attr; /* v4 only */
129 * Timestamp that dates the change made to read_cache_mtime.
130 * This is of use for dentry revalidation
132 unsigned long cache_mtime_jiffies;
134 struct nfs_access_cache cache_access;
137 * This is the cookie verifier used for NFSv3 readdir
143 * This is the list of dirty unwritten pages.
145 struct list_head dirty;
146 struct list_head commit;
147 struct radix_tree_root nfs_page_tree;
153 /* Credentials for shared mmap */
154 struct rpc_cred *mm_cred;
156 wait_queue_head_t nfs_i_wait;
160 struct nfs4_shareowner *ro_owner;
161 struct nfs4_shareowner *wo_owner;
162 struct nfs4_shareowner *rw_owner;
163 #endif /* CONFIG_NFS_V4*/
165 struct inode vfs_inode;
169 * Legal inode flag values
171 #define NFS_INO_STALE 0x0001 /* possible stale inode */
172 #define NFS_INO_ADVISE_RDPLUS 0x0002 /* advise readdirplus */
173 #define NFS_INO_REVALIDATING 0x0004 /* revalidating attrs */
174 #define NFS_INO_FLUSH 0x0008 /* inode is due for flushing */
175 #define NFS_INO_FAKE_ROOT 0x0080 /* root inode placeholder */
177 static inline struct nfs_inode *NFS_I(struct inode *inode)
179 return container_of(inode, struct nfs_inode, vfs_inode);
181 #define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
183 #define NFS_FH(inode) (&NFS_I(inode)->fh)
184 #define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
185 #define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
186 #define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
187 #define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
188 #define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
189 #define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
190 #define NFS_MTIME_UPDATE(inode) (NFS_I(inode)->cache_mtime_jiffies)
191 #define NFS_CACHE_CTIME(inode) (NFS_I(inode)->read_cache_ctime)
192 #define NFS_CACHE_MTIME(inode) (NFS_I(inode)->read_cache_mtime)
193 #define NFS_CACHE_ISIZE(inode) (NFS_I(inode)->read_cache_isize)
194 #define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
195 #define NFS_CACHEINV(inode) \
197 NFS_READTIME(inode) = jiffies - NFS_MAXATTRTIMEO(inode) - 1; \
199 #define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
200 #define NFS_MINATTRTIMEO(inode) \
201 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
202 : NFS_SERVER(inode)->acregmin)
203 #define NFS_MAXATTRTIMEO(inode) \
204 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
205 : NFS_SERVER(inode)->acregmax)
206 #define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
208 #define NFS_FLAGS(inode) (NFS_I(inode)->flags)
209 #define NFS_REVALIDATING(inode) (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
210 #define NFS_STALE(inode) (NFS_FLAGS(inode) & NFS_INO_STALE)
211 #define NFS_FAKE_ROOT(inode) (NFS_FLAGS(inode) & NFS_INO_FAKE_ROOT)
213 #define NFS_FILEID(inode) (NFS_I(inode)->fileid)
215 static inline int nfs_server_capable(struct inode *inode, int cap)
217 return NFS_SERVER(inode)->caps & cap;
220 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
222 return NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS;
226 loff_t page_offset(struct page *page)
228 return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
232 loff_t req_offset(struct nfs_page *req)
234 return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset;
238 * linux/fs/nfs/inode.c
240 extern void nfs_zap_caches(struct inode *);
241 extern struct inode *nfs_fhget(struct dentry *, struct nfs_fh *,
243 extern int __nfs_refresh_inode(struct inode *, struct nfs_fattr *);
244 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
245 extern int nfs_permission(struct inode *, int, struct nameidata *);
246 extern int nfs_open(struct inode *, struct file *);
247 extern int nfs_release(struct inode *, struct file *);
248 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
249 extern int nfs_setattr(struct dentry *, struct iattr *);
252 * linux/fs/nfs/file.c
254 extern struct inode_operations nfs_file_inode_operations;
255 extern struct file_operations nfs_file_operations;
256 extern struct address_space_operations nfs_file_aops;
258 static __inline__ struct rpc_cred *
259 nfs_file_cred(struct file *file)
261 struct rpc_cred *cred = NULL;
263 cred = (struct rpc_cred *)file->private_data;
265 if (cred && cred->cr_magic != RPCAUTH_CRED_MAGIC)
272 * linux/fs/nfs/direct.c
274 extern int nfs_direct_IO(int, struct file *, const struct iovec *, loff_t,
280 extern struct inode_operations nfs_dir_inode_operations;
281 extern struct file_operations nfs_dir_operations;
282 extern struct dentry_operations nfs_dentry_operations;
285 * linux/fs/nfs/symlink.c
287 extern struct inode_operations nfs_symlink_inode_operations;
290 * linux/fs/nfs/locks.c
292 extern int nfs_lock(struct file *, int, struct file_lock *);
295 * linux/fs/nfs/unlink.c
297 extern int nfs_async_unlink(struct dentry *);
298 extern void nfs_complete_unlink(struct dentry *);
301 * linux/fs/nfs/write.c
303 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
304 extern int nfs_writepages(struct address_space *, struct writeback_control *);
305 extern int nfs_flush_incompatible(struct file *file, struct page *page);
306 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
307 extern void nfs_writeback_done(struct rpc_task *task);
308 extern void nfs_writedata_release(struct rpc_task *task);
310 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
311 extern void nfs_commit_release(struct rpc_task *task);
312 extern void nfs_commit_done(struct rpc_task *);
316 * Try to write back everything synchronously (but check the
319 extern int nfs_sync_file(struct inode *, struct file *, unsigned long, unsigned int, int);
320 extern int nfs_flush_file(struct inode *, struct file *, unsigned long, unsigned int, int);
321 extern int nfs_flush_list(struct list_head *, int, int);
322 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
323 extern int nfs_commit_file(struct inode *, struct file *, unsigned long, unsigned int, int);
324 extern int nfs_commit_list(struct list_head *, int);
327 nfs_commit_file(struct inode *inode, struct file *file, unsigned long offset,
328 unsigned int len, int flags)
335 nfs_have_writebacks(struct inode *inode)
337 return NFS_I(inode)->npages != 0;
341 nfs_wb_all(struct inode *inode)
343 int error = nfs_sync_file(inode, 0, 0, 0, FLUSH_WAIT);
344 return (error < 0) ? error : 0;
348 * Write back all requests on one page - we do this before reading it.
351 nfs_wb_page(struct inode *inode, struct page* page)
353 int error = nfs_sync_file(inode, 0, page->index, 1,
354 FLUSH_WAIT | FLUSH_STABLE);
355 return (error < 0) ? error : 0;
359 * Write back all pending writes for one user..
362 nfs_wb_file(struct inode *inode, struct file *file)
364 int error = nfs_sync_file(inode, file, 0, 0, FLUSH_WAIT);
365 return (error < 0) ? error : 0;
368 /* Hack for future NFS swap support */
370 # define IS_SWAPFILE(inode) (0)
374 * linux/fs/nfs/read.c
376 extern int nfs_readpage(struct file *, struct page *);
377 extern int nfs_readpages(struct file *, struct address_space *,
378 struct list_head *, unsigned);
379 extern int nfs_pagein_list(struct list_head *, int);
380 extern void nfs_readpage_result(struct rpc_task *);
381 extern void nfs_readdata_release(struct rpc_task *);
384 * linux/fs/mount_clnt.c
385 * (Used only by nfsroot module)
387 extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
394 nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
396 if (time_before(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode)))
397 return NFS_STALE(inode) ? -ESTALE : 0;
398 return __nfs_revalidate_inode(server, inode);
402 nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
404 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
406 return __nfs_refresh_inode(inode,fattr);
410 nfs_size_to_loff_t(__u64 size)
412 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
415 return (loff_t) size;
419 nfs_fileid_to_ino_t(u64 fileid)
421 ino_t ino = (ino_t) fileid;
422 if (sizeof(ino_t) < sizeof(u64))
423 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
429 extern void * nfs_root_data(void);
431 #define nfs_wait_event(clnt, wq, condition) \
434 if (clnt->cl_intr) { \
436 rpc_clnt_sigmask(clnt, &oldmask); \
437 __retval = wait_event_interruptible(wq, condition); \
438 rpc_clnt_sigunmask(clnt, &oldmask); \
440 wait_event(wq, condition); \
444 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
449 * In a seqid-mutating op, this macro controls which error return
450 * values trigger incrementation of the seqid.
453 * The client MUST monotonically increment the sequence number for the
454 * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
455 * operations. This is true even in the event that the previous
456 * operation that used the sequence number received an error. The only
457 * exception to this rule is if the previous operation received one of
458 * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
459 * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
460 * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
463 #define seqid_mutating_err(err) \
464 (((err) != NFSERR_STALE_CLIENTID) && \
465 ((err) != NFSERR_STALE_STATEID) && \
466 ((err) != NFSERR_BAD_STATEID) && \
467 ((err) != NFSERR_BAD_SEQID) && \
468 ((err) != NFSERR_BAD_XDR) && \
469 ((err) != NFSERR_RESOURCE) && \
470 ((err) != NFSERR_NOFILEHANDLE))
473 u64 cl_clientid; /* constant */
474 nfs4_verifier cl_confirm;
480 * The ->so_sema is held during all shareowner seqid-mutating operations:
481 * OPEN, OPEN_DOWNGRADE, and CLOSE.
482 * Its purpose is to properly serialize so_seqid, as mandated by
485 struct nfs4_shareowner {
486 u32 so_id; /* 32-bit identifier, unique */
487 struct semaphore so_sema;
488 u32 so_seqid; /* protected by so_sema */
489 nfs4_stateid so_stateid; /* protected by so_sema */
490 unsigned int so_flags; /* protected by so_sema */
495 extern int nfs4_proc_renew(struct nfs_server *server);
496 extern int nfs4_do_close(struct inode *inode, struct nfs4_shareowner *sp);
499 extern int nfs4_init_renewd(struct nfs_server *server);
502 extern struct nfs4_client *nfs4_get_client(void);
503 extern void nfs4_put_client(struct nfs4_client *clp);
504 extern struct nfs4_shareowner * nfs4_get_shareowner(struct inode *inode);
505 void nfs4_put_shareowner(struct inode *inode, struct nfs4_shareowner *sp);
506 extern int nfs4_set_inode_share(struct inode * inode,
507 struct nfs4_shareowner *sp, unsigned int flags);
508 extern void nfs4_increment_seqid(u32 status, struct nfs4_shareowner *sp);
509 extern int nfs4_test_shareowner(struct inode *inode, unsigned int open_flags);
510 struct nfs4_shareowner * nfs4_get_inode_share(struct inode * inode, unsigned int open_flags);
517 struct nfs4_mount_data;
519 create_nfsv4_state(struct nfs_server *server, struct nfs4_mount_data *data)
521 server->nfs4_state = NULL;
526 destroy_nfsv4_state(struct nfs_server *server)
528 if (server->mnt_path) {
529 kfree(server->mnt_path);
530 server->mnt_path = NULL;
532 if (server->nfs4_state) {
533 nfs4_put_client(server->nfs4_state);
534 server->nfs4_state = NULL;
538 #define create_nfsv4_state(server, data) 0
539 #define destroy_nfsv4_state(server) do { } while (0)
540 #define nfs4_put_shareowner(inode, owner) do { } while (0)
543 #endif /* __KERNEL__ */
548 #define NFSDBG_VFS 0x0001
549 #define NFSDBG_DIRCACHE 0x0002
550 #define NFSDBG_LOOKUPCACHE 0x0004
551 #define NFSDBG_PAGECACHE 0x0008
552 #define NFSDBG_PROC 0x0010
553 #define NFSDBG_XDR 0x0020
554 #define NFSDBG_FILE 0x0040
555 #define NFSDBG_ROOT 0x0080
556 #define NFSDBG_ALL 0xFFFF
561 # define ifdebug(fac) if (nfs_debug & NFSDBG_##fac)
563 # define ifdebug(fac) if (0)
565 #endif /* __KERNEL */