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1/*
2 * linux/include/linux/nfs_fs.h
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * OS-specific nfs filesystem definitions and declarations
7 */
8
9#ifndef _LINUX_NFS_FS_H
10#define _LINUX_NFS_FS_H
11
12#include <linux/magic.h>
13
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)
19
20#define NFS_MAX_UDP_TIMEOUT (60*HZ)
21#define NFS_MAX_TCP_TIMEOUT (600*HZ)
22
23#define NFS_DEF_ACREGMIN (3)
24#define NFS_DEF_ACREGMAX (60)
25#define NFS_DEF_ACDIRMIN (30)
26#define NFS_DEF_ACDIRMAX (60)
27
28/*
29 * When flushing a cluster of dirty pages, there can be different
30 * strategies:
31 */
32#define FLUSH_SYNC 1 /* file being synced, or contention */
33#define FLUSH_STABLE 4 /* commit to stable storage */
34#define FLUSH_LOWPRI 8 /* low priority background flush */
35#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
36#define FLUSH_COND_STABLE 32 /* conditional stable write - only stable
37 * if everything fits in one RPC */
38
39#ifdef __KERNEL__
40
41/*
42 * Enable dprintk() debugging support for nfs client.
43 */
44#ifdef CONFIG_NFS_DEBUG
45# define NFS_DEBUG
46#endif
47
48#include <linux/in.h>
49#include <linux/mm.h>
50#include <linux/pagemap.h>
51#include <linux/rbtree.h>
52#include <linux/rwsem.h>
53#include <linux/wait.h>
54
55#include <linux/sunrpc/debug.h>
56#include <linux/sunrpc/auth.h>
57#include <linux/sunrpc/clnt.h>
58
59#include <linux/nfs.h>
60#include <linux/nfs2.h>
61#include <linux/nfs3.h>
62#include <linux/nfs4.h>
63#include <linux/nfs_xdr.h>
64#include <linux/nfs_fs_sb.h>
65
66#include <linux/mempool.h>
67
68/*
69 * These are the default flags for swap requests
70 */
71#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
72
73/*
74 * NFSv3/v4 Access mode cache entry
75 */
76struct nfs_access_entry {
77 struct rb_node rb_node;
78 struct list_head lru;
79 unsigned long jiffies;
80 struct rpc_cred * cred;
81 int mask;
82};
83
84struct nfs_lock_context {
85 atomic_t count;
86 struct list_head list;
87 struct nfs_open_context *open_context;
88 fl_owner_t lockowner;
89 pid_t pid;
90};
91
92struct nfs4_state;
93struct nfs_open_context {
94 struct nfs_lock_context lock_context;
95 struct dentry *dentry;
96 struct rpc_cred *cred;
97 struct nfs4_state *state;
98 fmode_t mode;
99
100 unsigned long flags;
101#define NFS_CONTEXT_ERROR_WRITE (0)
102 int error;
103
104 struct list_head list;
105};
106
107struct nfs_open_dir_context {
108 struct rpc_cred *cred;
109 unsigned long attr_gencount;
110 __u64 dir_cookie;
111 __u64 dup_cookie;
112 signed char duped;
113};
114
115/*
116 * NFSv4 delegation
117 */
118struct nfs_delegation;
119
120struct posix_acl;
121
122/*
123 * nfs fs inode data in memory
124 */
125struct nfs_inode {
126 /*
127 * The 64bit 'inode number'
128 */
129 __u64 fileid;
130
131 /*
132 * NFS file handle
133 */
134 struct nfs_fh fh;
135
136 /*
137 * Various flags
138 */
139 unsigned long flags; /* atomic bit ops */
140 unsigned long cache_validity; /* bit mask */
141
142 /*
143 * read_cache_jiffies is when we started read-caching this inode.
144 * attrtimeo is for how long the cached information is assumed
145 * to be valid. A successful attribute revalidation doubles
146 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
147 * acregmin/acdirmin.
148 *
149 * We need to revalidate the cached attrs for this inode if
150 *
151 * jiffies - read_cache_jiffies >= attrtimeo
152 *
153 * Please note the comparison is greater than or equal
154 * so that zero timeout values can be specified.
155 */
156 unsigned long read_cache_jiffies;
157 unsigned long attrtimeo;
158 unsigned long attrtimeo_timestamp;
159
160 unsigned long attr_gencount;
161 /* "Generation counter" for the attribute cache. This is
162 * bumped whenever we update the metadata on the
163 * server.
164 */
165 unsigned long cache_change_attribute;
166
167 struct rb_root access_cache;
168 struct list_head access_cache_entry_lru;
169 struct list_head access_cache_inode_lru;
170#ifdef CONFIG_NFS_V3_ACL
171 struct posix_acl *acl_access;
172 struct posix_acl *acl_default;
173#endif
174
175 /*
176 * This is the cookie verifier used for NFSv3 readdir
177 * operations
178 */
179 __be32 cookieverf[2];
180
181 unsigned long npages;
182 unsigned long ncommit;
183 struct list_head commit_list;
184
185 /* Open contexts for shared mmap writes */
186 struct list_head open_files;
187
188 /* Number of in-flight sillydelete RPC calls */
189 atomic_t silly_count;
190 /* List of deferred sillydelete requests */
191 struct hlist_head silly_list;
192 wait_queue_head_t waitqueue;
193
194#ifdef CONFIG_NFS_V4
195 struct nfs4_cached_acl *nfs4_acl;
196 /* NFSv4 state */
197 struct list_head open_states;
198 struct nfs_delegation __rcu *delegation;
199 fmode_t delegation_state;
200 struct rw_semaphore rwsem;
201
202 /* pNFS layout information */
203 struct pnfs_layout_hdr *layout;
204 atomic_t commits_outstanding;
205#endif /* CONFIG_NFS_V4*/
206#ifdef CONFIG_NFS_FSCACHE
207 struct fscache_cookie *fscache;
208#endif
209 struct inode vfs_inode;
210};
211
212/*
213 * Cache validity bit flags
214 */
215#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
216#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
217#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
218#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
219#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
220#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
221#define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
222
223/*
224 * Bit offsets in flags field
225 */
226#define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
227#define NFS_INO_STALE (1) /* possible stale inode */
228#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
229#define NFS_INO_FLUSHING (4) /* inode is flushing out data */
230#define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
231#define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
232#define NFS_INO_COMMIT (7) /* inode is committing unstable writes */
233#define NFS_INO_PNFS_COMMIT (8) /* use pnfs code for commit */
234#define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
235#define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
236
237static inline struct nfs_inode *NFS_I(const struct inode *inode)
238{
239 return container_of(inode, struct nfs_inode, vfs_inode);
240}
241
242static inline struct nfs_server *NFS_SB(const struct super_block *s)
243{
244 return (struct nfs_server *)(s->s_fs_info);
245}
246
247static inline struct nfs_fh *NFS_FH(const struct inode *inode)
248{
249 return &NFS_I(inode)->fh;
250}
251
252static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
253{
254 return NFS_SB(inode->i_sb);
255}
256
257static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
258{
259 return NFS_SERVER(inode)->client;
260}
261
262static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
263{
264 return NFS_SERVER(inode)->nfs_client->rpc_ops;
265}
266
267static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
268{
269 return NFS_I(inode)->cookieverf;
270}
271
272static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
273{
274 struct nfs_server *nfss = NFS_SERVER(inode);
275 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
276}
277
278static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
279{
280 struct nfs_server *nfss = NFS_SERVER(inode);
281 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
282}
283
284static inline int NFS_STALE(const struct inode *inode)
285{
286 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
287}
288
289static inline int NFS_FSCACHE(const struct inode *inode)
290{
291 return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
292}
293
294static inline __u64 NFS_FILEID(const struct inode *inode)
295{
296 return NFS_I(inode)->fileid;
297}
298
299static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
300{
301 NFS_I(inode)->fileid = fileid;
302}
303
304static inline void nfs_mark_for_revalidate(struct inode *inode)
305{
306 struct nfs_inode *nfsi = NFS_I(inode);
307
308 spin_lock(&inode->i_lock);
309 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
310 if (S_ISDIR(inode->i_mode))
311 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
312 spin_unlock(&inode->i_lock);
313}
314
315static inline int nfs_server_capable(struct inode *inode, int cap)
316{
317 return NFS_SERVER(inode)->caps & cap;
318}
319
320static inline int NFS_USE_READDIRPLUS(struct inode *inode)
321{
322 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
323}
324
325static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
326{
327 dentry->d_time = verf;
328}
329
330/**
331 * nfs_save_change_attribute - Returns the inode attribute change cookie
332 * @dir - pointer to parent directory inode
333 * The "change attribute" is updated every time we finish an operation
334 * that will result in a metadata change on the server.
335 */
336static inline unsigned long nfs_save_change_attribute(struct inode *dir)
337{
338 return NFS_I(dir)->cache_change_attribute;
339}
340
341/**
342 * nfs_verify_change_attribute - Detects NFS remote directory changes
343 * @dir - pointer to parent directory inode
344 * @chattr - previously saved change attribute
345 * Return "false" if the verifiers doesn't match the change attribute.
346 * This would usually indicate that the directory contents have changed on
347 * the server, and that any dentries need revalidating.
348 */
349static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
350{
351 return chattr == NFS_I(dir)->cache_change_attribute;
352}
353
354/*
355 * linux/fs/nfs/inode.c
356 */
357extern int nfs_sync_mapping(struct address_space *mapping);
358extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
359extern void nfs_zap_caches(struct inode *);
360extern void nfs_invalidate_atime(struct inode *);
361extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
362 struct nfs_fattr *);
363extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
364extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
365extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
366extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
367extern int nfs_permission(struct inode *, int);
368extern int nfs_open(struct inode *, struct file *);
369extern int nfs_release(struct inode *, struct file *);
370extern int nfs_attribute_timeout(struct inode *inode);
371extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
372extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
373extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
374extern int nfs_setattr(struct dentry *, struct iattr *);
375extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
376extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
377extern void put_nfs_open_context(struct nfs_open_context *ctx);
378extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
379extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
380extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
381extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
382extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
383extern u64 nfs_compat_user_ino64(u64 fileid);
384extern void nfs_fattr_init(struct nfs_fattr *fattr);
385extern unsigned long nfs_inc_attr_generation_counter(void);
386
387extern struct nfs_fattr *nfs_alloc_fattr(void);
388
389static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
390{
391 kfree(fattr);
392}
393
394extern struct nfs_fh *nfs_alloc_fhandle(void);
395
396static inline void nfs_free_fhandle(const struct nfs_fh *fh)
397{
398 kfree(fh);
399}
400
401#ifdef NFS_DEBUG
402extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
403static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
404{
405 return _nfs_display_fhandle_hash(fh);
406}
407extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
408#define nfs_display_fhandle(fh, caption) \
409 do { \
410 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
411 _nfs_display_fhandle(fh, caption); \
412 } while (0)
413#else
414static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
415{
416 return 0;
417}
418static inline void nfs_display_fhandle(const struct nfs_fh *fh,
419 const char *caption)
420{
421}
422#endif
423
424/*
425 * linux/fs/nfs/nfsroot.c
426 */
427extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
428/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
429extern __be32 root_nfs_parse_addr(char *name); /*__init*/
430
431/*
432 * linux/fs/nfs/file.c
433 */
434extern const struct inode_operations nfs_file_inode_operations;
435#ifdef CONFIG_NFS_V3
436extern const struct inode_operations nfs3_file_inode_operations;
437#endif /* CONFIG_NFS_V3 */
438extern const struct file_operations nfs_file_operations;
439#ifdef CONFIG_NFS_V4
440extern const struct file_operations nfs4_file_operations;
441#endif /* CONFIG_NFS_V4 */
442extern const struct address_space_operations nfs_file_aops;
443extern const struct address_space_operations nfs_dir_aops;
444
445static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
446{
447 return filp->private_data;
448}
449
450static inline struct rpc_cred *nfs_file_cred(struct file *file)
451{
452 if (file != NULL) {
453 struct nfs_open_context *ctx =
454 nfs_file_open_context(file);
455 if (ctx)
456 return ctx->cred;
457 }
458 return NULL;
459}
460
461/*
462 * linux/fs/nfs/xattr.c
463 */
464#ifdef CONFIG_NFS_V3_ACL
465extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
466extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
467extern int nfs3_setxattr(struct dentry *, const char *,
468 const void *, size_t, int);
469extern int nfs3_removexattr (struct dentry *, const char *name);
470#else
471# define nfs3_listxattr NULL
472# define nfs3_getxattr NULL
473# define nfs3_setxattr NULL
474# define nfs3_removexattr NULL
475#endif
476
477/*
478 * linux/fs/nfs/direct.c
479 */
480extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
481 unsigned long);
482extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
483 const struct iovec *iov, unsigned long nr_segs,
484 loff_t pos);
485extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
486 const struct iovec *iov, unsigned long nr_segs,
487 loff_t pos);
488
489/*
490 * linux/fs/nfs/dir.c
491 */
492extern const struct inode_operations nfs_dir_inode_operations;
493#ifdef CONFIG_NFS_V3
494extern const struct inode_operations nfs3_dir_inode_operations;
495#endif /* CONFIG_NFS_V3 */
496extern const struct file_operations nfs_dir_operations;
497extern const struct dentry_operations nfs_dentry_operations;
498
499extern void nfs_force_lookup_revalidate(struct inode *dir);
500extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
501extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
502extern void nfs_access_zap_cache(struct inode *inode);
503
504/*
505 * linux/fs/nfs/symlink.c
506 */
507extern const struct inode_operations nfs_symlink_inode_operations;
508
509/*
510 * linux/fs/nfs/sysctl.c
511 */
512#ifdef CONFIG_SYSCTL
513extern int nfs_register_sysctl(void);
514extern void nfs_unregister_sysctl(void);
515#else
516#define nfs_register_sysctl() 0
517#define nfs_unregister_sysctl() do { } while(0)
518#endif
519
520/*
521 * linux/fs/nfs/namespace.c
522 */
523extern const struct inode_operations nfs_mountpoint_inode_operations;
524extern const struct inode_operations nfs_referral_inode_operations;
525extern int nfs_mountpoint_expiry_timeout;
526extern void nfs_release_automount_timer(void);
527
528/*
529 * linux/fs/nfs/unlink.c
530 */
531extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
532extern void nfs_block_sillyrename(struct dentry *dentry);
533extern void nfs_unblock_sillyrename(struct dentry *dentry);
534extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
535
536/*
537 * linux/fs/nfs/write.c
538 */
539extern int nfs_congestion_kb;
540extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
541extern int nfs_writepages(struct address_space *, struct writeback_control *);
542extern int nfs_flush_incompatible(struct file *file, struct page *page);
543extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
544extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
545
546/*
547 * Try to write back everything synchronously (but check the
548 * return value!)
549 */
550extern int nfs_wb_all(struct inode *inode);
551extern int nfs_wb_page(struct inode *inode, struct page* page);
552extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
553#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
554extern int nfs_commit_inode(struct inode *, int);
555extern struct nfs_write_data *nfs_commitdata_alloc(void);
556extern void nfs_commit_free(struct nfs_write_data *wdata);
557#else
558static inline int
559nfs_commit_inode(struct inode *inode, int how)
560{
561 return 0;
562}
563#endif
564
565static inline int
566nfs_have_writebacks(struct inode *inode)
567{
568 return NFS_I(inode)->npages != 0;
569}
570
571/*
572 * Allocate nfs_write_data structures
573 */
574extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
575extern void nfs_writedata_free(struct nfs_write_data *);
576
577/*
578 * linux/fs/nfs/read.c
579 */
580extern int nfs_readpage(struct file *, struct page *);
581extern int nfs_readpages(struct file *, struct address_space *,
582 struct list_head *, unsigned);
583extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
584extern int nfs_readpage_async(struct nfs_open_context *, struct inode *,
585 struct page *);
586
587/*
588 * Allocate nfs_read_data structures
589 */
590extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
591extern void nfs_readdata_free(struct nfs_read_data *);
592
593/*
594 * linux/fs/nfs3proc.c
595 */
596#ifdef CONFIG_NFS_V3_ACL
597extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
598extern int nfs3_proc_setacl(struct inode *inode, int type,
599 struct posix_acl *acl);
600extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
601 umode_t mode);
602extern void nfs3_forget_cached_acls(struct inode *inode);
603#else
604static inline int nfs3_proc_set_default_acl(struct inode *dir,
605 struct inode *inode,
606 umode_t mode)
607{
608 return 0;
609}
610
611static inline void nfs3_forget_cached_acls(struct inode *inode)
612{
613}
614#endif /* CONFIG_NFS_V3_ACL */
615
616/*
617 * inline functions
618 */
619
620static inline loff_t nfs_size_to_loff_t(__u64 size)
621{
622 if (size > (__u64) OFFSET_MAX - 1)
623 return OFFSET_MAX - 1;
624 return (loff_t) size;
625}
626
627static inline ino_t
628nfs_fileid_to_ino_t(u64 fileid)
629{
630 ino_t ino = (ino_t) fileid;
631 if (sizeof(ino_t) < sizeof(u64))
632 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
633 return ino;
634}
635
636#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
637
638#endif /* __KERNEL__ */
639
640/*
641 * NFS debug flags
642 */
643#define NFSDBG_VFS 0x0001
644#define NFSDBG_DIRCACHE 0x0002
645#define NFSDBG_LOOKUPCACHE 0x0004
646#define NFSDBG_PAGECACHE 0x0008
647#define NFSDBG_PROC 0x0010
648#define NFSDBG_XDR 0x0020
649#define NFSDBG_FILE 0x0040
650#define NFSDBG_ROOT 0x0080
651#define NFSDBG_CALLBACK 0x0100
652#define NFSDBG_CLIENT 0x0200
653#define NFSDBG_MOUNT 0x0400
654#define NFSDBG_FSCACHE 0x0800
655#define NFSDBG_PNFS 0x1000
656#define NFSDBG_PNFS_LD 0x2000
657#define NFSDBG_ALL 0xFFFF
658
659#ifdef __KERNEL__
660
661# undef ifdebug
662# ifdef NFS_DEBUG
663# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
664# define NFS_IFDEBUG(x) x
665# else
666# define ifdebug(fac) if (0)
667# define NFS_IFDEBUG(x)
668# endif
669#endif /* __KERNEL */
670
671#endif