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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#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 */
49struct 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 struct rcu_head rcu_head;
56};
57
58struct nfs_lockowner {
59 fl_owner_t l_owner;
60 pid_t l_pid;
61};
62
63#define NFS_IO_INPROGRESS 0
64struct nfs_io_counter {
65 unsigned long flags;
66 atomic_t io_count;
67};
68
69struct nfs_lock_context {
70 atomic_t count;
71 struct list_head list;
72 struct nfs_open_context *open_context;
73 struct nfs_lockowner lockowner;
74 struct nfs_io_counter io_count;
75};
76
77struct nfs4_state;
78struct nfs_open_context {
79 struct nfs_lock_context lock_context;
80 struct dentry *dentry;
81 struct rpc_cred *cred;
82 struct nfs4_state *state;
83 fmode_t mode;
84
85 unsigned long flags;
86#define NFS_CONTEXT_ERROR_WRITE (0)
87#define NFS_CONTEXT_RESEND_WRITES (1)
88#define NFS_CONTEXT_BAD (2)
89 int error;
90
91 struct list_head list;
92 struct nfs4_threshold *mdsthreshold;
93};
94
95struct nfs_open_dir_context {
96 struct list_head list;
97 struct rpc_cred *cred;
98 unsigned long attr_gencount;
99 __u64 dir_cookie;
100 __u64 dup_cookie;
101 signed char duped;
102};
103
104/*
105 * NFSv4 delegation
106 */
107struct nfs_delegation;
108
109struct posix_acl;
110
111/*
112 * nfs fs inode data in memory
113 */
114struct nfs_inode {
115 /*
116 * The 64bit 'inode number'
117 */
118 __u64 fileid;
119
120 /*
121 * NFS file handle
122 */
123 struct nfs_fh fh;
124
125 /*
126 * Various flags
127 */
128 unsigned long flags; /* atomic bit ops */
129 unsigned long cache_validity; /* bit mask */
130
131 /*
132 * read_cache_jiffies is when we started read-caching this inode.
133 * attrtimeo is for how long the cached information is assumed
134 * to be valid. A successful attribute revalidation doubles
135 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
136 * acregmin/acdirmin.
137 *
138 * We need to revalidate the cached attrs for this inode if
139 *
140 * jiffies - read_cache_jiffies >= attrtimeo
141 *
142 * Please note the comparison is greater than or equal
143 * so that zero timeout values can be specified.
144 */
145 unsigned long read_cache_jiffies;
146 unsigned long attrtimeo;
147 unsigned long attrtimeo_timestamp;
148
149 unsigned long attr_gencount;
150 /* "Generation counter" for the attribute cache. This is
151 * bumped whenever we update the metadata on the
152 * server.
153 */
154 unsigned long cache_change_attribute;
155
156 struct rb_root access_cache;
157 struct list_head access_cache_entry_lru;
158 struct list_head access_cache_inode_lru;
159
160 /*
161 * This is the cookie verifier used for NFSv3 readdir
162 * operations
163 */
164 __be32 cookieverf[2];
165
166 unsigned long nrequests;
167 struct nfs_mds_commit_info commit_info;
168
169 /* Open contexts for shared mmap writes */
170 struct list_head open_files;
171
172 /* Number of in-flight sillydelete RPC calls */
173 atomic_t silly_count;
174 /* List of deferred sillydelete requests */
175 struct hlist_head silly_list;
176 wait_queue_head_t waitqueue;
177
178#if IS_ENABLED(CONFIG_NFS_V4)
179 struct nfs4_cached_acl *nfs4_acl;
180 /* NFSv4 state */
181 struct list_head open_states;
182 struct nfs_delegation __rcu *delegation;
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
223static inline struct nfs_inode *NFS_I(const struct inode *inode)
224{
225 return container_of(inode, struct nfs_inode, vfs_inode);
226}
227
228static inline struct nfs_server *NFS_SB(const struct super_block *s)
229{
230 return (struct nfs_server *)(s->s_fs_info);
231}
232
233static inline struct nfs_fh *NFS_FH(const struct inode *inode)
234{
235 return &NFS_I(inode)->fh;
236}
237
238static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
239{
240 return NFS_SB(inode->i_sb);
241}
242
243static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
244{
245 return NFS_SERVER(inode)->client;
246}
247
248static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
249{
250 return NFS_SERVER(inode)->nfs_client->rpc_ops;
251}
252
253static 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
259static 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
265static inline int NFS_STALE(const struct inode *inode)
266{
267 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
268}
269
270static 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
279static inline __u64 NFS_FILEID(const struct inode *inode)
280{
281 return NFS_I(inode)->fileid;
282}
283
284static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
285{
286 NFS_I(inode)->fileid = fileid;
287}
288
289static 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
300static inline int nfs_server_capable(struct inode *inode, int cap)
301{
302 return NFS_SERVER(inode)->caps & cap;
303}
304
305static 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 */
316static 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 */
329static 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 */
337extern int nfs_sync_mapping(struct address_space *mapping);
338extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
339extern void nfs_zap_caches(struct inode *);
340extern void nfs_invalidate_atime(struct inode *);
341extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
342 struct nfs_fattr *, struct nfs4_label *);
343extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
344extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
345extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
346extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
347extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
348extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
349extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
350extern int nfs_permission(struct inode *, int);
351extern int nfs_open(struct inode *, struct file *);
352extern int nfs_release(struct inode *, struct file *);
353extern int nfs_attribute_timeout(struct inode *inode);
354extern int nfs_attribute_cache_expired(struct inode *inode);
355extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
356extern int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode);
357extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
358extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
359extern int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping);
360extern int nfs_setattr(struct dentry *, struct iattr *);
361extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
362extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
363 struct nfs4_label *label);
364extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
365extern void put_nfs_open_context(struct nfs_open_context *ctx);
366extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
367extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
368extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
369extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
370extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
371extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
372extern u64 nfs_compat_user_ino64(u64 fileid);
373extern void nfs_fattr_init(struct nfs_fattr *fattr);
374extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
375extern unsigned long nfs_inc_attr_generation_counter(void);
376
377extern struct nfs_fattr *nfs_alloc_fattr(void);
378
379static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
380{
381 kfree(fattr);
382}
383
384extern struct nfs_fh *nfs_alloc_fhandle(void);
385
386static inline void nfs_free_fhandle(const struct nfs_fh *fh)
387{
388 kfree(fh);
389}
390
391#ifdef NFS_DEBUG
392extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
393static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
394{
395 return _nfs_display_fhandle_hash(fh);
396}
397extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
398#define nfs_display_fhandle(fh, caption) \
399 do { \
400 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
401 _nfs_display_fhandle(fh, caption); \
402 } while (0)
403#else
404static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
405{
406 return 0;
407}
408static inline void nfs_display_fhandle(const struct nfs_fh *fh,
409 const char *caption)
410{
411}
412#endif
413
414/*
415 * linux/fs/nfs/nfsroot.c
416 */
417extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
418/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
419extern __be32 root_nfs_parse_addr(char *name); /*__init*/
420
421/*
422 * linux/fs/nfs/file.c
423 */
424extern const struct file_operations nfs_file_operations;
425#if IS_ENABLED(CONFIG_NFS_V4)
426extern const struct file_operations nfs4_file_operations;
427#endif /* CONFIG_NFS_V4 */
428extern const struct address_space_operations nfs_file_aops;
429extern const struct address_space_operations nfs_dir_aops;
430
431static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
432{
433 return filp->private_data;
434}
435
436static inline struct rpc_cred *nfs_file_cred(struct file *file)
437{
438 if (file != NULL) {
439 struct nfs_open_context *ctx =
440 nfs_file_open_context(file);
441 if (ctx)
442 return ctx->cred;
443 }
444 return NULL;
445}
446
447/*
448 * linux/fs/nfs/direct.c
449 */
450extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *, loff_t);
451extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
452 struct iov_iter *iter,
453 loff_t pos);
454extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
455 struct iov_iter *iter);
456
457/*
458 * linux/fs/nfs/dir.c
459 */
460extern const struct file_operations nfs_dir_operations;
461extern const struct dentry_operations nfs_dentry_operations;
462
463extern void nfs_force_lookup_revalidate(struct inode *dir);
464extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
465 struct nfs_fattr *fattr, struct nfs4_label *label);
466extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
467extern void nfs_access_zap_cache(struct inode *inode);
468
469/*
470 * linux/fs/nfs/symlink.c
471 */
472extern const struct inode_operations nfs_symlink_inode_operations;
473
474/*
475 * linux/fs/nfs/sysctl.c
476 */
477#ifdef CONFIG_SYSCTL
478extern int nfs_register_sysctl(void);
479extern void nfs_unregister_sysctl(void);
480#else
481#define nfs_register_sysctl() 0
482#define nfs_unregister_sysctl() do { } while(0)
483#endif
484
485/*
486 * linux/fs/nfs/namespace.c
487 */
488extern const struct inode_operations nfs_mountpoint_inode_operations;
489extern const struct inode_operations nfs_referral_inode_operations;
490extern int nfs_mountpoint_expiry_timeout;
491extern void nfs_release_automount_timer(void);
492
493/*
494 * linux/fs/nfs/unlink.c
495 */
496extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
497extern void nfs_wait_on_sillyrename(struct dentry *dentry);
498extern void nfs_block_sillyrename(struct dentry *dentry);
499extern void nfs_unblock_sillyrename(struct dentry *dentry);
500
501/*
502 * linux/fs/nfs/write.c
503 */
504extern int nfs_congestion_kb;
505extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
506extern int nfs_writepages(struct address_space *, struct writeback_control *);
507extern int nfs_flush_incompatible(struct file *file, struct page *page);
508extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
509
510/*
511 * Try to write back everything synchronously (but check the
512 * return value!)
513 */
514extern int nfs_sync_inode(struct inode *inode);
515extern int nfs_wb_all(struct inode *inode);
516extern int nfs_wb_page(struct inode *inode, struct page* page);
517extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
518extern int nfs_commit_inode(struct inode *, int);
519extern struct nfs_commit_data *nfs_commitdata_alloc(void);
520extern void nfs_commit_free(struct nfs_commit_data *data);
521
522static inline int
523nfs_have_writebacks(struct inode *inode)
524{
525 return NFS_I(inode)->nrequests != 0;
526}
527
528/*
529 * linux/fs/nfs/read.c
530 */
531extern int nfs_readpage(struct file *, struct page *);
532extern int nfs_readpages(struct file *, struct address_space *,
533 struct list_head *, unsigned);
534extern int nfs_readpage_async(struct nfs_open_context *, struct inode *,
535 struct page *);
536
537/*
538 * inline functions
539 */
540
541static inline loff_t nfs_size_to_loff_t(__u64 size)
542{
543 if (size > (__u64) OFFSET_MAX - 1)
544 return OFFSET_MAX - 1;
545 return (loff_t) size;
546}
547
548static inline ino_t
549nfs_fileid_to_ino_t(u64 fileid)
550{
551 ino_t ino = (ino_t) fileid;
552 if (sizeof(ino_t) < sizeof(u64))
553 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
554 return ino;
555}
556
557#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
558
559
560# undef ifdebug
561# ifdef NFS_DEBUG
562# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
563# define NFS_IFDEBUG(x) x
564# else
565# define ifdebug(fac) if (0)
566# define NFS_IFDEBUG(x)
567# endif
568#endif