xref: /openbmc/linux/include/linux/nfs_fs.h (revision b34e08d5)
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 #ifndef _LINUX_NFS_FS_H
9 #define _LINUX_NFS_FS_H
10 
11 #include <uapi/linux/nfs_fs.h>
12 
13 
14 /*
15  * Enable dprintk() debugging support for nfs client.
16  */
17 #ifdef CONFIG_NFS_DEBUG
18 # define NFS_DEBUG
19 #endif
20 
21 #include <linux/in.h>
22 #include <linux/mm.h>
23 #include <linux/pagemap.h>
24 #include <linux/rbtree.h>
25 #include <linux/rwsem.h>
26 #include <linux/wait.h>
27 
28 #include <linux/sunrpc/debug.h>
29 #include <linux/sunrpc/auth.h>
30 #include <linux/sunrpc/clnt.h>
31 
32 #include <linux/nfs.h>
33 #include <linux/nfs2.h>
34 #include <linux/nfs3.h>
35 #include <linux/nfs4.h>
36 #include <linux/nfs_xdr.h>
37 #include <linux/nfs_fs_sb.h>
38 
39 #include <linux/mempool.h>
40 
41 /*
42  * These are the default flags for swap requests
43  */
44 #define NFS_RPC_SWAPFLAGS		(RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
45 
46 /*
47  * NFSv3/v4 Access mode cache entry
48  */
49 struct nfs_access_entry {
50 	struct rb_node		rb_node;
51 	struct list_head	lru;
52 	unsigned long		jiffies;
53 	struct rpc_cred *	cred;
54 	int			mask;
55 };
56 
57 struct nfs_lockowner {
58 	fl_owner_t l_owner;
59 	pid_t l_pid;
60 };
61 
62 #define NFS_IO_INPROGRESS 0
63 struct nfs_io_counter {
64 	unsigned long flags;
65 	atomic_t io_count;
66 };
67 
68 struct nfs_lock_context {
69 	atomic_t count;
70 	struct list_head list;
71 	struct nfs_open_context *open_context;
72 	struct nfs_lockowner lockowner;
73 	struct nfs_io_counter io_count;
74 };
75 
76 struct nfs4_state;
77 struct nfs_open_context {
78 	struct nfs_lock_context lock_context;
79 	struct dentry *dentry;
80 	struct rpc_cred *cred;
81 	struct nfs4_state *state;
82 	fmode_t mode;
83 
84 	unsigned long flags;
85 #define NFS_CONTEXT_ERROR_WRITE		(0)
86 #define NFS_CONTEXT_RESEND_WRITES	(1)
87 #define NFS_CONTEXT_BAD			(2)
88 	int error;
89 
90 	struct list_head list;
91 	struct nfs4_threshold	*mdsthreshold;
92 };
93 
94 struct nfs_open_dir_context {
95 	struct list_head list;
96 	struct rpc_cred *cred;
97 	unsigned long attr_gencount;
98 	__u64 dir_cookie;
99 	__u64 dup_cookie;
100 	signed char duped;
101 };
102 
103 /*
104  * NFSv4 delegation
105  */
106 struct nfs_delegation;
107 
108 struct posix_acl;
109 
110 /*
111  * nfs fs inode data in memory
112  */
113 struct nfs_inode {
114 	/*
115 	 * The 64bit 'inode number'
116 	 */
117 	__u64 fileid;
118 
119 	/*
120 	 * NFS file handle
121 	 */
122 	struct nfs_fh		fh;
123 
124 	/*
125 	 * Various flags
126 	 */
127 	unsigned long		flags;			/* atomic bit ops */
128 	unsigned long		cache_validity;		/* bit mask */
129 
130 	/*
131 	 * read_cache_jiffies is when we started read-caching this inode.
132 	 * attrtimeo is for how long the cached information is assumed
133 	 * to be valid. A successful attribute revalidation doubles
134 	 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
135 	 * acregmin/acdirmin.
136 	 *
137 	 * We need to revalidate the cached attrs for this inode if
138 	 *
139 	 *	jiffies - read_cache_jiffies >= attrtimeo
140 	 *
141 	 * Please note the comparison is greater than or equal
142 	 * so that zero timeout values can be specified.
143 	 */
144 	unsigned long		read_cache_jiffies;
145 	unsigned long		attrtimeo;
146 	unsigned long		attrtimeo_timestamp;
147 
148 	unsigned long		attr_gencount;
149 	/* "Generation counter" for the attribute cache. This is
150 	 * bumped whenever we update the metadata on the
151 	 * server.
152 	 */
153 	unsigned long		cache_change_attribute;
154 
155 	struct rb_root		access_cache;
156 	struct list_head	access_cache_entry_lru;
157 	struct list_head	access_cache_inode_lru;
158 
159 	/*
160 	 * This is the cookie verifier used for NFSv3 readdir
161 	 * operations
162 	 */
163 	__be32			cookieverf[2];
164 
165 	unsigned long		npages;
166 	struct nfs_mds_commit_info commit_info;
167 
168 	/* Open contexts for shared mmap writes */
169 	struct list_head	open_files;
170 
171 	/* Number of in-flight sillydelete RPC calls */
172 	atomic_t		silly_count;
173 	/* List of deferred sillydelete requests */
174 	struct hlist_head	silly_list;
175 	wait_queue_head_t	waitqueue;
176 
177 #if IS_ENABLED(CONFIG_NFS_V4)
178 	struct nfs4_cached_acl	*nfs4_acl;
179         /* NFSv4 state */
180 	struct list_head	open_states;
181 	struct nfs_delegation __rcu *delegation;
182 	fmode_t			 delegation_state;
183 	struct rw_semaphore	rwsem;
184 
185 	/* pNFS layout information */
186 	struct pnfs_layout_hdr *layout;
187 #endif /* CONFIG_NFS_V4*/
188 	/* how many bytes have been written/read and how many bytes queued up */
189 	__u64 write_io;
190 	__u64 read_io;
191 #ifdef CONFIG_NFS_FSCACHE
192 	struct fscache_cookie	*fscache;
193 #endif
194 	struct inode		vfs_inode;
195 };
196 
197 /*
198  * Cache validity bit flags
199  */
200 #define NFS_INO_INVALID_ATTR	0x0001		/* cached attrs are invalid */
201 #define NFS_INO_INVALID_DATA	0x0002		/* cached data is invalid */
202 #define NFS_INO_INVALID_ATIME	0x0004		/* cached atime is invalid */
203 #define NFS_INO_INVALID_ACCESS	0x0008		/* cached access cred invalid */
204 #define NFS_INO_INVALID_ACL	0x0010		/* cached acls are invalid */
205 #define NFS_INO_REVAL_PAGECACHE	0x0020		/* must revalidate pagecache */
206 #define NFS_INO_REVAL_FORCED	0x0040		/* force revalidation ignoring a delegation */
207 #define NFS_INO_INVALID_LABEL	0x0080		/* cached label is invalid */
208 
209 /*
210  * Bit offsets in flags field
211  */
212 #define NFS_INO_ADVISE_RDPLUS	(0)		/* advise readdirplus */
213 #define NFS_INO_STALE		(1)		/* possible stale inode */
214 #define NFS_INO_ACL_LRU_SET	(2)		/* Inode is on the LRU list */
215 #define NFS_INO_INVALIDATING	(3)		/* inode is being invalidated */
216 #define NFS_INO_FLUSHING	(4)		/* inode is flushing out data */
217 #define NFS_INO_FSCACHE		(5)		/* inode can be cached by FS-Cache */
218 #define NFS_INO_FSCACHE_LOCK	(6)		/* FS-Cache cookie management lock */
219 #define NFS_INO_COMMIT		(7)		/* inode is committing unstable writes */
220 #define NFS_INO_LAYOUTCOMMIT	(9)		/* layoutcommit required */
221 #define NFS_INO_LAYOUTCOMMITTING (10)		/* layoutcommit inflight */
222 
223 static inline struct nfs_inode *NFS_I(const struct inode *inode)
224 {
225 	return container_of(inode, struct nfs_inode, vfs_inode);
226 }
227 
228 static inline struct nfs_server *NFS_SB(const struct super_block *s)
229 {
230 	return (struct nfs_server *)(s->s_fs_info);
231 }
232 
233 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
234 {
235 	return &NFS_I(inode)->fh;
236 }
237 
238 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
239 {
240 	return NFS_SB(inode->i_sb);
241 }
242 
243 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
244 {
245 	return NFS_SERVER(inode)->client;
246 }
247 
248 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
249 {
250 	return NFS_SERVER(inode)->nfs_client->rpc_ops;
251 }
252 
253 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
254 {
255 	struct nfs_server *nfss = NFS_SERVER(inode);
256 	return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
257 }
258 
259 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
260 {
261 	struct nfs_server *nfss = NFS_SERVER(inode);
262 	return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
263 }
264 
265 static inline int NFS_STALE(const struct inode *inode)
266 {
267 	return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
268 }
269 
270 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
271 {
272 #ifdef CONFIG_NFS_FSCACHE
273 	return NFS_I(inode)->fscache;
274 #else
275 	return NULL;
276 #endif
277 }
278 
279 static inline __u64 NFS_FILEID(const struct inode *inode)
280 {
281 	return NFS_I(inode)->fileid;
282 }
283 
284 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
285 {
286 	NFS_I(inode)->fileid = fileid;
287 }
288 
289 static inline void nfs_mark_for_revalidate(struct inode *inode)
290 {
291 	struct nfs_inode *nfsi = NFS_I(inode);
292 
293 	spin_lock(&inode->i_lock);
294 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
295 	if (S_ISDIR(inode->i_mode))
296 		nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
297 	spin_unlock(&inode->i_lock);
298 }
299 
300 static inline int nfs_server_capable(struct inode *inode, int cap)
301 {
302 	return NFS_SERVER(inode)->caps & cap;
303 }
304 
305 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
306 {
307 	dentry->d_time = verf;
308 }
309 
310 /**
311  * nfs_save_change_attribute - Returns the inode attribute change cookie
312  * @dir - pointer to parent directory inode
313  * The "change attribute" is updated every time we finish an operation
314  * that will result in a metadata change on the server.
315  */
316 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
317 {
318 	return NFS_I(dir)->cache_change_attribute;
319 }
320 
321 /**
322  * nfs_verify_change_attribute - Detects NFS remote directory changes
323  * @dir - pointer to parent directory inode
324  * @chattr - previously saved change attribute
325  * Return "false" if the verifiers doesn't match the change attribute.
326  * This would usually indicate that the directory contents have changed on
327  * the server, and that any dentries need revalidating.
328  */
329 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
330 {
331 	return chattr == NFS_I(dir)->cache_change_attribute;
332 }
333 
334 /*
335  * linux/fs/nfs/inode.c
336  */
337 extern int nfs_sync_mapping(struct address_space *mapping);
338 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
339 extern void nfs_zap_caches(struct inode *);
340 extern void nfs_invalidate_atime(struct inode *);
341 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
342 				struct nfs_fattr *, struct nfs4_label *);
343 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
344 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
345 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
346 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
347 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
348 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
349 extern int nfs_permission(struct inode *, int);
350 extern int nfs_open(struct inode *, struct file *);
351 extern int nfs_release(struct inode *, struct file *);
352 extern int nfs_attribute_timeout(struct inode *inode);
353 extern int nfs_attribute_cache_expired(struct inode *inode);
354 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
355 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
356 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
357 extern int nfs_setattr(struct dentry *, struct iattr *);
358 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
359 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
360 				struct nfs4_label *label);
361 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
362 extern void put_nfs_open_context(struct nfs_open_context *ctx);
363 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
364 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
365 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
366 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
367 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
368 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
369 extern u64 nfs_compat_user_ino64(u64 fileid);
370 extern void nfs_fattr_init(struct nfs_fattr *fattr);
371 extern unsigned long nfs_inc_attr_generation_counter(void);
372 
373 extern struct nfs_fattr *nfs_alloc_fattr(void);
374 
375 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
376 {
377 	kfree(fattr);
378 }
379 
380 extern struct nfs_fh *nfs_alloc_fhandle(void);
381 
382 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
383 {
384 	kfree(fh);
385 }
386 
387 #ifdef NFS_DEBUG
388 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
389 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
390 {
391 	return _nfs_display_fhandle_hash(fh);
392 }
393 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
394 #define nfs_display_fhandle(fh, caption)			\
395 	do {							\
396 		if (unlikely(nfs_debug & NFSDBG_FACILITY))	\
397 			_nfs_display_fhandle(fh, caption);	\
398 	} while (0)
399 #else
400 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
401 {
402 	return 0;
403 }
404 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
405 				       const char *caption)
406 {
407 }
408 #endif
409 
410 /*
411  * linux/fs/nfs/nfsroot.c
412  */
413 extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
414 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
415 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
416 
417 /*
418  * linux/fs/nfs/file.c
419  */
420 extern const struct file_operations nfs_file_operations;
421 #if IS_ENABLED(CONFIG_NFS_V4)
422 extern const struct file_operations nfs4_file_operations;
423 #endif /* CONFIG_NFS_V4 */
424 extern const struct address_space_operations nfs_file_aops;
425 extern const struct address_space_operations nfs_dir_aops;
426 
427 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
428 {
429 	return filp->private_data;
430 }
431 
432 static inline struct rpc_cred *nfs_file_cred(struct file *file)
433 {
434 	if (file != NULL) {
435 		struct nfs_open_context *ctx =
436 			nfs_file_open_context(file);
437 		if (ctx)
438 			return ctx->cred;
439 	}
440 	return NULL;
441 }
442 
443 /*
444  * linux/fs/nfs/xattr.c
445  */
446 #ifdef CONFIG_NFS_V3_ACL
447 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
448 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
449 extern int nfs3_setxattr(struct dentry *, const char *,
450 			const void *, size_t, int);
451 extern int nfs3_removexattr (struct dentry *, const char *name);
452 #else
453 # define nfs3_listxattr NULL
454 # define nfs3_getxattr NULL
455 # define nfs3_setxattr NULL
456 # define nfs3_removexattr NULL
457 #endif
458 
459 /*
460  * linux/fs/nfs/direct.c
461  */
462 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
463 			unsigned long);
464 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
465 			const struct iovec *iov, unsigned long nr_segs,
466 			loff_t pos, bool uio);
467 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
468 			const struct iovec *iov, unsigned long nr_segs,
469 			loff_t pos, bool uio);
470 
471 /*
472  * linux/fs/nfs/dir.c
473  */
474 extern const struct file_operations nfs_dir_operations;
475 extern const struct dentry_operations nfs_dentry_operations;
476 
477 extern void nfs_force_lookup_revalidate(struct inode *dir);
478 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
479 			struct nfs_fattr *fattr, struct nfs4_label *label);
480 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
481 extern void nfs_access_zap_cache(struct inode *inode);
482 
483 /*
484  * linux/fs/nfs/symlink.c
485  */
486 extern const struct inode_operations nfs_symlink_inode_operations;
487 
488 /*
489  * linux/fs/nfs/sysctl.c
490  */
491 #ifdef CONFIG_SYSCTL
492 extern int nfs_register_sysctl(void);
493 extern void nfs_unregister_sysctl(void);
494 #else
495 #define nfs_register_sysctl() 0
496 #define nfs_unregister_sysctl() do { } while(0)
497 #endif
498 
499 /*
500  * linux/fs/nfs/namespace.c
501  */
502 extern const struct inode_operations nfs_mountpoint_inode_operations;
503 extern const struct inode_operations nfs_referral_inode_operations;
504 extern int nfs_mountpoint_expiry_timeout;
505 extern void nfs_release_automount_timer(void);
506 
507 /*
508  * linux/fs/nfs/unlink.c
509  */
510 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
511 extern void nfs_wait_on_sillyrename(struct dentry *dentry);
512 extern void nfs_block_sillyrename(struct dentry *dentry);
513 extern void nfs_unblock_sillyrename(struct dentry *dentry);
514 
515 /*
516  * linux/fs/nfs/write.c
517  */
518 extern int  nfs_congestion_kb;
519 extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
520 extern int  nfs_writepages(struct address_space *, struct writeback_control *);
521 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
522 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
523 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
524 
525 /*
526  * Try to write back everything synchronously (but check the
527  * return value!)
528  */
529 extern int nfs_wb_all(struct inode *inode);
530 extern int nfs_wb_page(struct inode *inode, struct page* page);
531 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
532 #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
533 extern int  nfs_commit_inode(struct inode *, int);
534 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
535 extern void nfs_commit_free(struct nfs_commit_data *data);
536 #else
537 static inline int
538 nfs_commit_inode(struct inode *inode, int how)
539 {
540 	return 0;
541 }
542 #endif
543 
544 static inline int
545 nfs_have_writebacks(struct inode *inode)
546 {
547 	return NFS_I(inode)->npages != 0;
548 }
549 
550 /*
551  * linux/fs/nfs/read.c
552  */
553 extern int  nfs_readpage(struct file *, struct page *);
554 extern int  nfs_readpages(struct file *, struct address_space *,
555 		struct list_head *, unsigned);
556 extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
557 extern int  nfs_readpage_async(struct nfs_open_context *, struct inode *,
558 			       struct page *);
559 
560 /*
561  * linux/fs/nfs3proc.c
562  */
563 #ifdef CONFIG_NFS_V3_ACL
564 extern struct posix_acl *nfs3_get_acl(struct inode *inode, int type);
565 extern int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type);
566 extern int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
567 		struct posix_acl *dfacl);
568 extern const struct xattr_handler *nfs3_xattr_handlers[];
569 #else
570 static inline int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
571 		struct posix_acl *dfacl)
572 {
573 	return 0;
574 }
575 #endif /* CONFIG_NFS_V3_ACL */
576 
577 /*
578  * inline functions
579  */
580 
581 static inline loff_t nfs_size_to_loff_t(__u64 size)
582 {
583 	if (size > (__u64) OFFSET_MAX - 1)
584 		return OFFSET_MAX - 1;
585 	return (loff_t) size;
586 }
587 
588 static inline ino_t
589 nfs_fileid_to_ino_t(u64 fileid)
590 {
591 	ino_t ino = (ino_t) fileid;
592 	if (sizeof(ino_t) < sizeof(u64))
593 		ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
594 	return ino;
595 }
596 
597 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
598 
599 
600 # undef ifdebug
601 # ifdef NFS_DEBUG
602 #  define ifdebug(fac)		if (unlikely(nfs_debug & NFSDBG_##fac))
603 #  define NFS_IFDEBUG(x)	x
604 # else
605 #  define ifdebug(fac)		if (0)
606 #  define NFS_IFDEBUG(x)
607 # endif
608 #endif
609