1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/include/linux/nfs_fs.h
5 * Copyright (C) 1992 Rick Sladkey
7 * OS-specific nfs filesystem definitions and declarations
9 #ifndef _LINUX_NFS_FS_H
10 #define _LINUX_NFS_FS_H
12 #include <uapi/linux/nfs_fs.h>
16 * Enable dprintk() debugging support for nfs client.
18 #ifdef CONFIG_NFS_DEBUG
24 #include <linux/pagemap.h>
25 #include <linux/rbtree.h>
26 #include <linux/refcount.h>
27 #include <linux/rwsem.h>
28 #include <linux/wait.h>
30 #include <linux/sunrpc/debug.h>
31 #include <linux/sunrpc/auth.h>
32 #include <linux/sunrpc/clnt.h>
34 #include <linux/nfs.h>
35 #include <linux/nfs2.h>
36 #include <linux/nfs3.h>
37 #include <linux/nfs4.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/nfs_fs_sb.h>
41 #include <linux/mempool.h>
44 * These are the default flags for swap requests
46 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
49 * NFSv3/v4 Access mode cache entry
51 struct nfs_access_entry {
52 struct rb_node rb_node;
54 const struct cred * cred;
56 struct rcu_head rcu_head;
59 struct nfs_lock_context {
61 struct list_head list;
62 struct nfs_open_context *open_context;
65 struct rcu_head rcu_head;
69 struct nfs_open_context {
70 struct nfs_lock_context lock_context;
71 fl_owner_t flock_owner;
72 struct dentry *dentry;
73 const struct cred *cred;
74 struct rpc_cred *ll_cred; /* low-level cred - use to check for expiry */
75 struct nfs4_state *state;
79 #define NFS_CONTEXT_RESEND_WRITES (1)
80 #define NFS_CONTEXT_BAD (2)
81 #define NFS_CONTEXT_UNLOCK (3)
84 struct list_head list;
85 struct nfs4_threshold *mdsthreshold;
86 struct rcu_head rcu_head;
89 struct nfs_open_dir_context {
90 struct list_head list;
91 const struct cred *cred;
92 unsigned long attr_gencount;
101 struct nfs_delegation;
106 * nfs fs inode data in memory
110 * The 64bit 'inode number'
122 unsigned long flags; /* atomic bit ops */
123 unsigned long cache_validity; /* bit mask */
126 * read_cache_jiffies is when we started read-caching this inode.
127 * attrtimeo is for how long the cached information is assumed
128 * to be valid. A successful attribute revalidation doubles
129 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
132 * We need to revalidate the cached attrs for this inode if
134 * jiffies - read_cache_jiffies >= attrtimeo
136 * Please note the comparison is greater than or equal
137 * so that zero timeout values can be specified.
139 unsigned long read_cache_jiffies;
140 unsigned long attrtimeo;
141 unsigned long attrtimeo_timestamp;
143 unsigned long attr_gencount;
144 /* "Generation counter" for the attribute cache. This is
145 * bumped whenever we update the metadata on the
148 unsigned long cache_change_attribute;
150 struct rb_root access_cache;
151 struct list_head access_cache_entry_lru;
152 struct list_head access_cache_inode_lru;
155 * This is the cookie verifier used for NFSv3 readdir
158 __be32 cookieverf[2];
160 atomic_long_t nrequests;
161 struct nfs_mds_commit_info commit_info;
163 /* Open contexts for shared mmap writes */
164 struct list_head open_files;
166 /* Readers: in-flight sillydelete RPC calls */
168 struct rw_semaphore rmdir_sem;
169 struct mutex commit_mutex;
171 /* track last access to cached pages */
172 unsigned long page_index;
174 #if IS_ENABLED(CONFIG_NFS_V4)
175 struct nfs4_cached_acl *nfs4_acl;
177 struct list_head open_states;
178 struct nfs_delegation __rcu *delegation;
179 struct rw_semaphore rwsem;
181 /* pNFS layout information */
182 struct pnfs_layout_hdr *layout;
183 #endif /* CONFIG_NFS_V4*/
184 /* how many bytes have been written/read and how many bytes queued up */
187 #ifdef CONFIG_NFS_FSCACHE
188 struct fscache_cookie *fscache;
190 struct inode vfs_inode;
193 struct nfs4_copy_state {
194 struct list_head copies;
195 struct list_head src_copies;
196 nfs4_stateid stateid;
197 struct completion completion;
199 struct nfs_writeverf verf;
202 struct nfs4_state *parent_src_state;
203 struct nfs4_state *parent_dst_state;
209 #define NFS_ACCESS_READ 0x0001
210 #define NFS_ACCESS_LOOKUP 0x0002
211 #define NFS_ACCESS_MODIFY 0x0004
212 #define NFS_ACCESS_EXTEND 0x0008
213 #define NFS_ACCESS_DELETE 0x0010
214 #define NFS_ACCESS_EXECUTE 0x0020
217 * Cache validity bit flags
219 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
220 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
221 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
222 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
223 #define NFS_INO_REVAL_PAGECACHE BIT(5) /* must revalidate pagecache */
224 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
225 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
226 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
227 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
228 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
229 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
230 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
231 #define NFS_INO_DATA_INVAL_DEFER \
232 BIT(13) /* Deferred cache invalidation */
234 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
235 | NFS_INO_INVALID_CTIME \
236 | NFS_INO_INVALID_MTIME \
237 | NFS_INO_INVALID_SIZE \
238 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
241 * Bit offsets in flags field
243 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
244 #define NFS_INO_STALE (1) /* possible stale inode */
245 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
246 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
247 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
248 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
249 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
250 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
251 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
252 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
254 static inline struct nfs_inode *NFS_I(const struct inode *inode)
256 return container_of(inode, struct nfs_inode, vfs_inode);
259 static inline struct nfs_server *NFS_SB(const struct super_block *s)
261 return (struct nfs_server *)(s->s_fs_info);
264 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
266 return &NFS_I(inode)->fh;
269 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
271 return NFS_SB(inode->i_sb);
274 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
276 return NFS_SERVER(inode)->client;
279 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
281 return NFS_SERVER(inode)->nfs_client->rpc_ops;
284 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
286 struct nfs_server *nfss = NFS_SERVER(inode);
287 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
290 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
292 struct nfs_server *nfss = NFS_SERVER(inode);
293 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
296 static inline int NFS_STALE(const struct inode *inode)
298 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
301 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
303 #ifdef CONFIG_NFS_FSCACHE
304 return NFS_I(inode)->fscache;
310 static inline __u64 NFS_FILEID(const struct inode *inode)
312 return NFS_I(inode)->fileid;
315 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
317 NFS_I(inode)->fileid = fileid;
320 static inline void nfs_mark_for_revalidate(struct inode *inode)
322 struct nfs_inode *nfsi = NFS_I(inode);
324 spin_lock(&inode->i_lock);
325 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE
326 | NFS_INO_INVALID_ACCESS
327 | NFS_INO_INVALID_ACL
328 | NFS_INO_INVALID_CHANGE
329 | NFS_INO_INVALID_CTIME;
330 if (S_ISDIR(inode->i_mode))
331 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
332 spin_unlock(&inode->i_lock);
335 static inline int nfs_server_capable(struct inode *inode, int cap)
337 return NFS_SERVER(inode)->caps & cap;
340 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
342 dentry->d_time = verf;
346 * nfs_save_change_attribute - Returns the inode attribute change cookie
347 * @dir - pointer to parent directory inode
348 * The "change attribute" is updated every time we finish an operation
349 * that will result in a metadata change on the server.
351 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
353 return NFS_I(dir)->cache_change_attribute;
357 * nfs_verify_change_attribute - Detects NFS remote directory changes
358 * @dir - pointer to parent directory inode
359 * @chattr - previously saved change attribute
360 * Return "false" if the verifiers doesn't match the change attribute.
361 * This would usually indicate that the directory contents have changed on
362 * the server, and that any dentries need revalidating.
364 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
366 return chattr == NFS_I(dir)->cache_change_attribute;
370 * linux/fs/nfs/inode.c
372 extern int nfs_sync_mapping(struct address_space *mapping);
373 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
374 extern void nfs_zap_caches(struct inode *);
375 extern void nfs_invalidate_atime(struct inode *);
376 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
377 struct nfs_fattr *, struct nfs4_label *);
378 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
379 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
380 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
381 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
382 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
383 extern int nfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
384 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
385 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
386 extern int nfs_permission(struct inode *, int);
387 extern int nfs_open(struct inode *, struct file *);
388 extern int nfs_attribute_cache_expired(struct inode *inode);
389 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
390 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
391 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
392 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
393 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
394 extern int nfs_setattr(struct dentry *, struct iattr *);
395 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
396 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
397 struct nfs4_label *label);
398 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
399 extern void put_nfs_open_context(struct nfs_open_context *ctx);
400 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
401 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
402 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
403 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
404 extern void nfs_file_clear_open_context(struct file *flip);
405 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
406 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
407 extern u64 nfs_compat_user_ino64(u64 fileid);
408 extern void nfs_fattr_init(struct nfs_fattr *fattr);
409 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
410 extern unsigned long nfs_inc_attr_generation_counter(void);
412 extern struct nfs_fattr *nfs_alloc_fattr(void);
414 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
419 extern struct nfs_fh *nfs_alloc_fhandle(void);
421 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
427 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
428 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
430 return _nfs_display_fhandle_hash(fh);
432 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
433 #define nfs_display_fhandle(fh, caption) \
435 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
436 _nfs_display_fhandle(fh, caption); \
439 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
443 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
450 * linux/fs/nfs/nfsroot.c
452 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
453 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
454 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
457 * linux/fs/nfs/file.c
459 extern const struct file_operations nfs_file_operations;
460 #if IS_ENABLED(CONFIG_NFS_V4)
461 extern const struct file_operations nfs4_file_operations;
462 #endif /* CONFIG_NFS_V4 */
463 extern const struct address_space_operations nfs_file_aops;
464 extern const struct address_space_operations nfs_dir_aops;
466 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
468 return filp->private_data;
471 static inline const struct cred *nfs_file_cred(struct file *file)
474 struct nfs_open_context *ctx =
475 nfs_file_open_context(file);
483 * linux/fs/nfs/direct.c
485 extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *);
486 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
487 struct iov_iter *iter);
488 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
489 struct iov_iter *iter);
494 extern const struct file_operations nfs_dir_operations;
495 extern const struct dentry_operations nfs_dentry_operations;
497 extern void nfs_force_lookup_revalidate(struct inode *dir);
498 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
499 struct nfs_fh *fh, struct nfs_fattr *fattr,
500 struct nfs4_label *label);
501 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
502 struct nfs_fattr *fattr, struct nfs4_label *label);
503 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
504 extern void nfs_access_zap_cache(struct inode *inode);
507 * linux/fs/nfs/symlink.c
509 extern const struct inode_operations nfs_symlink_inode_operations;
512 * linux/fs/nfs/sysctl.c
515 extern int nfs_register_sysctl(void);
516 extern void nfs_unregister_sysctl(void);
518 #define nfs_register_sysctl() 0
519 #define nfs_unregister_sysctl() do { } while(0)
523 * linux/fs/nfs/namespace.c
525 extern const struct inode_operations nfs_mountpoint_inode_operations;
526 extern const struct inode_operations nfs_referral_inode_operations;
527 extern int nfs_mountpoint_expiry_timeout;
528 extern void nfs_release_automount_timer(void);
531 * linux/fs/nfs/unlink.c
533 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
536 * linux/fs/nfs/write.c
538 extern int nfs_congestion_kb;
539 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
540 extern int nfs_writepages(struct address_space *, struct writeback_control *);
541 extern int nfs_flush_incompatible(struct file *file, struct page *page);
542 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
545 * Try to write back everything synchronously (but check the
548 extern int nfs_sync_inode(struct inode *inode);
549 extern int nfs_wb_all(struct inode *inode);
550 extern int nfs_wb_page(struct inode *inode, struct page *page);
551 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
552 extern int nfs_commit_inode(struct inode *, int);
553 extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail);
554 extern void nfs_commit_free(struct nfs_commit_data *data);
557 nfs_have_writebacks(struct inode *inode)
559 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
563 * linux/fs/nfs/read.c
565 extern int nfs_readpage(struct file *, struct page *);
566 extern int nfs_readpages(struct file *, struct address_space *,
567 struct list_head *, unsigned);
568 extern int nfs_readpage_async(struct nfs_open_context *, struct inode *,
575 static inline loff_t nfs_size_to_loff_t(__u64 size)
577 return min_t(u64, size, OFFSET_MAX);
581 nfs_fileid_to_ino_t(u64 fileid)
583 ino_t ino = (ino_t) fileid;
584 if (sizeof(ino_t) < sizeof(u64))
585 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
589 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
594 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
595 # define NFS_IFDEBUG(x) x
597 # define ifdebug(fac) if (0)
598 # define NFS_IFDEBUG(x)