1 /* SPDX-License-Identifier: GPL-2.0 */
3 * NFS internal definitions
7 #include <linux/fs_context.h>
8 #include <linux/security.h>
9 #include <linux/crc32.h>
10 #include <linux/sunrpc/addr.h>
11 #include <linux/nfs_page.h>
12 #include <linux/wait_bit.h>
14 #define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
16 extern const struct export_operations nfs_export_ops;
19 struct nfs_pageio_descriptor;
21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
29 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
30 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
31 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
36 static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry)
38 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL))
40 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size)
45 static inline fmode_t flags_to_mode(int flags)
47 fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
48 if ((flags & O_ACCMODE) != O_WRONLY)
50 if ((flags & O_ACCMODE) != O_RDONLY)
56 * Note: RFC 1813 doesn't limit the number of auth flavors that
57 * a server can return, so make something up.
59 #define NFS_MAX_SECFLAVORS (12)
62 * Value used if the user did not specify a port value.
64 #define NFS_UNSPEC_PORT (-1)
66 #define NFS_UNSPEC_RETRANS (UINT_MAX)
67 #define NFS_UNSPEC_TIMEO (UINT_MAX)
69 struct nfs_client_initdata {
70 unsigned long init_flags;
71 const char *hostname; /* Hostname of the server */
72 const struct sockaddr_storage *addr; /* Address of the server */
73 const char *nodename; /* Hostname of the client */
74 const char *ip_addr; /* IP address of the client */
76 struct nfs_subversion *nfs_mod;
79 unsigned int nconnect;
80 unsigned int max_connect;
82 const struct rpc_timeout *timeparms;
83 const struct cred *cred;
84 struct xprtsec_parms xprtsec;
85 unsigned long connect_timeout;
86 unsigned long reconnect_timeout;
90 * In-kernel mount arguments
92 struct nfs_fs_context {
94 bool skip_reconfig_option_check;
97 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
98 unsigned int rsize, wsize;
99 unsigned int timeo, retrans;
100 unsigned int acregmin, acregmax;
101 unsigned int acdirmin, acdirmax;
103 unsigned int options;
105 struct nfs_auth_info auth_info;
106 rpc_authflavor_t selected_flavor;
107 struct xprtsec_parms xprtsec;
108 char *client_address;
109 unsigned int version;
110 unsigned int minorversion;
112 unsigned short protofamily;
113 unsigned short mountfamily;
114 bool has_sec_mnt_opts;
119 struct sockaddr address;
120 struct sockaddr_storage _address;
126 unsigned short protocol;
131 struct sockaddr address;
132 struct sockaddr_storage _address;
138 unsigned short protocol;
139 unsigned short nconnect;
140 unsigned short max_connect;
141 unsigned short export_path_len;
144 struct nfs_fh *mntfh;
145 struct nfs_server *server;
146 struct nfs_subversion *nfs_mod;
148 /* Information for a cloned mount. */
149 struct nfs_clone_mount {
150 struct super_block *sb;
151 struct dentry *dentry;
152 struct nfs_fattr *fattr;
153 unsigned int inherited_bsize;
157 enum nfs_lock_status {
158 NFS_LOCK_NOT_SET = 0,
163 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \
164 errorf(fc, fmt, ## __VA_ARGS__) : \
165 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
167 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \
168 errorf(fc, fmt, ## __VA_ARGS__) : \
169 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
171 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \
172 invalf(fc, fmt, ## __VA_ARGS__) : \
173 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; }))
175 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \
176 invalf(fc, fmt, ## __VA_ARGS__) : \
177 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; }))
179 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \
180 warnf(fc, fmt, ## __VA_ARGS__) : \
181 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
183 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \
184 warnf(fc, fmt, ## __VA_ARGS__) : \
185 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
187 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
189 return fc->fs_private;
193 struct nfs_mount_request {
194 struct sockaddr_storage *sap;
199 unsigned short protocol;
202 unsigned int *auth_flav_len;
203 rpc_authflavor_t *auth_flavs;
207 extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans);
208 extern void nfs_umount(const struct nfs_mount_request *info);
211 extern const struct rpc_program nfs_program;
212 extern void nfs_clients_init(struct net *net);
213 extern void nfs_clients_exit(struct net *net);
214 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
215 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
216 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
217 int nfs_probe_server(struct nfs_server *, struct nfs_fh *);
218 void nfs_server_insert_lists(struct nfs_server *);
219 void nfs_server_remove_lists(struct nfs_server *);
220 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
221 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
223 struct nfs_server *nfs_alloc_server(void);
224 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
226 extern void nfs_put_client(struct nfs_client *);
227 extern void nfs_free_client(struct nfs_client *);
228 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
229 extern struct nfs_client *
230 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
231 struct nfs4_sessionid *, u32);
232 extern struct nfs_server *nfs_create_server(struct fs_context *);
233 extern void nfs4_server_set_init_caps(struct nfs_server *);
234 extern struct nfs_server *nfs4_create_server(struct fs_context *);
235 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
236 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
237 struct sockaddr_storage *sap, size_t salen,
239 extern void nfs_free_server(struct nfs_server *server);
240 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
244 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
245 extern int nfs_client_init_status(const struct nfs_client *clp);
246 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
247 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
248 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
249 const struct sockaddr_storage *ds_addr,
250 int ds_addrlen, int ds_proto,
251 unsigned int ds_timeo,
252 unsigned int ds_retrans,
254 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
256 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
257 const struct sockaddr_storage *ds_addr, int ds_addrlen,
258 int ds_proto, unsigned int ds_timeo,
259 unsigned int ds_retrans);
260 #ifdef CONFIG_PROC_FS
261 extern int __init nfs_fs_proc_init(void);
262 extern void nfs_fs_proc_exit(void);
263 extern int nfs_fs_proc_net_init(struct net *net);
264 extern void nfs_fs_proc_net_exit(struct net *net);
266 static inline int nfs_fs_proc_net_init(struct net *net)
270 static inline void nfs_fs_proc_net_exit(struct net *net)
273 static inline int nfs_fs_proc_init(void)
277 static inline void nfs_fs_proc_exit(void)
283 extern const struct svc_version nfs4_callback_version1;
284 extern const struct svc_version nfs4_callback_version4;
287 extern struct file_system_type nfs_fs_type;
290 extern int __init nfs_init_nfspagecache(void);
291 extern void nfs_destroy_nfspagecache(void);
292 extern int __init nfs_init_readpagecache(void);
293 extern void nfs_destroy_readpagecache(void);
294 extern int __init nfs_init_writepagecache(void);
295 extern void nfs_destroy_writepagecache(void);
297 extern int __init nfs_init_directcache(void);
298 extern void nfs_destroy_directcache(void);
299 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
300 struct nfs_pgio_header *hdr,
301 void (*release)(struct nfs_pgio_header *hdr));
302 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
303 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
305 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
306 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
307 void nfs_pgio_header_free(struct nfs_pgio_header *);
308 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
309 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
310 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
311 const struct rpc_call_ops *call_ops, int how, int flags);
312 void nfs_free_request(struct nfs_page *req);
313 struct nfs_pgio_mirror *
314 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
316 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
317 const struct nfs_open_context *ctx2)
319 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
323 extern const struct rpc_procinfo nfs_procedures[];
324 extern int nfs2_decode_dirent(struct xdr_stream *,
325 struct nfs_entry *, bool);
328 extern const struct rpc_procinfo nfs3_procedures[];
329 extern int nfs3_decode_dirent(struct xdr_stream *,
330 struct nfs_entry *, bool);
333 #if IS_ENABLED(CONFIG_NFS_V4)
334 extern int nfs4_decode_dirent(struct xdr_stream *,
335 struct nfs_entry *, bool);
337 #ifdef CONFIG_NFS_V4_1
338 extern const u32 nfs41_maxread_overhead;
339 extern const u32 nfs41_maxwrite_overhead;
340 extern const u32 nfs41_maxgetdevinfo_overhead;
344 #if IS_ENABLED(CONFIG_NFS_V4)
345 extern const struct rpc_procinfo nfs4_procedures[];
348 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
349 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
350 static inline struct nfs4_label *
351 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
356 if (src->len > NFS4_MAXLABELLEN)
362 memcpy(dst->label, src->label, src->len);
367 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
369 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
370 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
373 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
374 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
377 static inline struct nfs4_label *
378 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
382 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
385 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
386 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
387 const struct nfs_client_initdata *);
390 extern void nfs_readdir_record_entry_cache_hit(struct inode *dir);
391 extern void nfs_readdir_record_entry_cache_miss(struct inode *dir);
392 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
393 struct shrink_control *sc);
394 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
395 struct shrink_control *sc);
396 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
397 void nfs_d_prune_case_insensitive_aliases(struct inode *inode);
398 int nfs_create(struct mnt_idmap *, struct inode *, struct dentry *,
400 int nfs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *,
402 int nfs_rmdir(struct inode *, struct dentry *);
403 int nfs_unlink(struct inode *, struct dentry *);
404 int nfs_symlink(struct mnt_idmap *, struct inode *, struct dentry *,
406 int nfs_link(struct dentry *, struct inode *, struct dentry *);
407 int nfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *, umode_t,
409 int nfs_rename(struct mnt_idmap *, struct inode *, struct dentry *,
410 struct inode *, struct dentry *, unsigned int);
412 #ifdef CONFIG_NFS_V4_2
413 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server)
415 if (!(server->caps & NFS_CAP_XATTR))
417 return NFS4_ACCESS_XAREAD | NFS4_ACCESS_XAWRITE | NFS4_ACCESS_XALIST;
420 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server)
427 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
428 loff_t nfs_file_llseek(struct file *, loff_t, int);
429 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
430 ssize_t nfs_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe,
431 size_t len, unsigned int flags);
432 int nfs_file_mmap(struct file *, struct vm_area_struct *);
433 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
434 int nfs_file_release(struct inode *, struct file *);
435 int nfs_lock(struct file *, int, struct file_lock *);
436 int nfs_flock(struct file *, int, struct file_lock *);
437 int nfs_check_flags(int);
440 extern struct workqueue_struct *nfsiod_workqueue;
441 extern struct inode *nfs_alloc_inode(struct super_block *sb);
442 extern void nfs_free_inode(struct inode *);
443 extern int nfs_write_inode(struct inode *, struct writeback_control *);
444 extern int nfs_drop_inode(struct inode *);
445 extern void nfs_clear_inode(struct inode *);
446 extern void nfs_evict_inode(struct inode *);
447 extern void nfs_zap_acl_cache(struct inode *inode);
448 extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags);
449 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
450 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
453 extern const struct super_operations nfs_sops;
454 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
455 int nfs_try_get_tree(struct fs_context *);
456 int nfs_get_tree_common(struct fs_context *);
457 void nfs_kill_super(struct super_block *);
459 extern int __init register_nfs_fs(void);
460 extern void __exit unregister_nfs_fs(void);
461 extern bool nfs_sb_active(struct super_block *sb);
462 extern void nfs_sb_deactive(struct super_block *sb);
463 extern int nfs_client_for_each_server(struct nfs_client *clp,
464 int (*fn)(struct nfs_server *, void *),
466 #ifdef CONFIG_NFS_FSCACHE
467 extern const struct netfs_request_ops nfs_netfs_ops;
471 extern void nfs_start_io_read(struct inode *inode);
472 extern void nfs_end_io_read(struct inode *inode);
473 extern void nfs_start_io_write(struct inode *inode);
474 extern void nfs_end_io_write(struct inode *inode);
475 extern void nfs_start_io_direct(struct inode *inode);
476 extern void nfs_end_io_direct(struct inode *inode);
478 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
480 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
484 #define NFS_PATH_CANONICAL 1
485 extern char *nfs_path(char **p, struct dentry *dentry,
486 char *buffer, ssize_t buflen, unsigned flags);
487 extern struct vfsmount *nfs_d_automount(struct path *path);
488 int nfs_submount(struct fs_context *, struct nfs_server *);
489 int nfs_do_submount(struct fs_context *);
492 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
493 #if IS_ENABLED(CONFIG_NFS_V4)
494 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
497 struct nfs_pgio_completion_ops;
499 extern const struct nfs_pgio_completion_ops nfs_async_read_completion_ops;
500 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
501 struct inode *inode, bool force_mds,
502 const struct nfs_pgio_completion_ops *compl_ops);
503 extern bool nfs_read_alloc_scratch(struct nfs_pgio_header *hdr, size_t size);
504 extern int nfs_read_add_folio(struct nfs_pageio_descriptor *pgio,
505 struct nfs_open_context *ctx,
506 struct folio *folio);
507 extern void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio);
508 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
509 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
512 void nfs_umount_begin(struct super_block *);
513 int nfs_statfs(struct dentry *, struct kstatfs *);
514 int nfs_show_options(struct seq_file *, struct dentry *);
515 int nfs_show_devname(struct seq_file *, struct dentry *);
516 int nfs_show_path(struct seq_file *, struct dentry *);
517 int nfs_show_stats(struct seq_file *, struct dentry *);
518 int nfs_reconfigure(struct fs_context *);
521 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
522 struct inode *inode, int ioflags, bool force_mds,
523 const struct nfs_pgio_completion_ops *compl_ops);
524 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
525 extern void nfs_commit_free(struct nfs_commit_data *p);
526 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
527 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
528 struct nfs_commit_data *data,
529 const struct nfs_rpc_ops *nfs_ops,
530 const struct rpc_call_ops *call_ops,
532 extern void nfs_init_commit(struct nfs_commit_data *data,
533 struct list_head *head,
534 struct pnfs_layout_segment *lseg,
535 struct nfs_commit_info *cinfo);
536 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
537 struct nfs_commit_info *cinfo, int max);
538 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
539 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
540 struct nfs_commit_info *cinfo);
541 void nfs_mark_request_commit(struct nfs_page *req,
542 struct pnfs_layout_segment *lseg,
543 struct nfs_commit_info *cinfo,
545 int nfs_write_need_commit(struct nfs_pgio_header *);
546 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
547 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
548 int how, struct nfs_commit_info *cinfo);
549 void nfs_retry_commit(struct list_head *page_list,
550 struct pnfs_layout_segment *lseg,
551 struct nfs_commit_info *cinfo,
553 void nfs_commitdata_release(struct nfs_commit_data *data);
554 void nfs_request_add_commit_list(struct nfs_page *req,
555 struct nfs_commit_info *cinfo);
556 void nfs_request_add_commit_list_locked(struct nfs_page *req,
557 struct list_head *dst,
558 struct nfs_commit_info *cinfo);
559 void nfs_request_remove_commit_list(struct nfs_page *req,
560 struct nfs_commit_info *cinfo);
561 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
563 struct nfs_direct_req *dreq);
564 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
565 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
566 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
568 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
569 loff_t lstart, loff_t lend);
571 #ifdef CONFIG_NFS_V4_1
573 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
574 unsigned int nbuckets)
578 for (i = 0; i < nbuckets; i++)
579 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
582 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
584 struct pnfs_commit_array *array;
587 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
588 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
594 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
599 #ifdef CONFIG_MIGRATION
600 int nfs_migrate_folio(struct address_space *, struct folio *dst,
601 struct folio *src, enum migrate_mode);
603 #define nfs_migrate_folio NULL
607 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
608 const struct nfs_write_verifier *v2)
610 return memcmp(v1->data, v2->data, sizeof(v1->data));
614 nfs_write_match_verf(const struct nfs_writeverf *verf,
615 struct nfs_page *req)
617 return verf->committed > NFS_UNSTABLE &&
618 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
621 static inline gfp_t nfs_io_gfp_mask(void)
623 if (current->flags & PF_WQ_WORKER)
624 return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
629 * Special version of should_remove_suid() that ignores capabilities.
631 static inline int nfs_should_remove_suid(const struct inode *inode)
633 umode_t mode = inode->i_mode;
636 /* suid always must be killed */
637 if (unlikely(mode & S_ISUID))
638 kill = ATTR_KILL_SUID;
641 * sgid without any exec bits is just a mandatory locking mark; leave
642 * it alone. If some exec bits are set, it's a real sgid; kill it.
644 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
645 kill |= ATTR_KILL_SGID;
647 if (unlikely(kill && S_ISREG(mode)))
654 extern struct rpc_task *
655 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
656 struct dentry *old_dentry, struct dentry *new_dentry,
657 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
658 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
661 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
662 struct nfs_direct_req *dreq);
663 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq, loff_t offset);
666 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
667 const struct nfs_client_initdata *);
668 extern int nfs40_walk_client_list(struct nfs_client *clp,
669 struct nfs_client **result,
670 const struct cred *cred);
671 extern int nfs41_walk_client_list(struct nfs_client *clp,
672 struct nfs_client **result,
673 const struct cred *cred);
674 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
675 struct rpc_xprt *xprt,
678 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
680 struct super_block *sb = inode->i_sb;
682 if (sb && nfs_sb_active(sb)) {
690 static inline void nfs_iput_and_deactive(struct inode *inode)
693 struct super_block *sb = inode->i_sb;
701 * Determine the device name as a string
703 static inline char *nfs_devname(struct dentry *dentry,
704 char *buffer, ssize_t buflen)
707 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
711 * Determine the actual block size (and log2 thereof)
714 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
716 /* make sure blocksize is a power of two */
717 if ((bsize & (bsize - 1)) || nrbitsp) {
718 unsigned char nrbits;
720 for (nrbits = 31; nrbits && !(bsize & (1UL << nrbits)); nrbits--)
722 bsize = 1UL << nrbits;
731 * Calculate the number of 512byte blocks used.
733 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
735 blkcnt_t used = (tsize + 511) >> 9;
736 return (used > ULONG_MAX) ? ULONG_MAX : used;
740 * Compute and set NFS server blocksize
743 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
745 if (bsize < NFS_MIN_FILE_IO_SIZE)
746 bsize = NFS_DEF_FILE_IO_SIZE;
747 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
748 bsize = NFS_MAX_FILE_IO_SIZE;
750 return nfs_block_bits(bsize, nrbitsp);
754 * Compute and set NFS server rsize / wsize
757 unsigned long nfs_io_size(unsigned long iosize, enum xprt_transports proto)
759 if (iosize < NFS_MIN_FILE_IO_SIZE)
760 iosize = NFS_DEF_FILE_IO_SIZE;
761 else if (iosize >= NFS_MAX_FILE_IO_SIZE)
762 iosize = NFS_MAX_FILE_IO_SIZE;
764 if (proto == XPRT_TRANSPORT_UDP || iosize < PAGE_SIZE)
765 return nfs_block_bits(iosize, NULL);
766 return iosize & PAGE_MASK;
770 * Determine the maximum file size for a superblock
773 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
775 sb->s_maxbytes = (loff_t)maxfilesize;
776 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
777 sb->s_maxbytes = MAX_LFS_FILESIZE;
781 * Record the page as unstable (an extra writeback period) and mark its
784 static inline void nfs_folio_mark_unstable(struct folio *folio,
785 struct nfs_commit_info *cinfo)
787 if (folio && !cinfo->dreq) {
788 struct inode *inode = folio_file_mapping(folio)->host;
789 long nr = folio_nr_pages(folio);
791 /* This page is really still in write-back - just that the
792 * writeback is happening on the server now.
794 node_stat_mod_folio(folio, NR_WRITEBACK, nr);
795 wb_stat_mod(&inode_to_bdi(inode)->wb, WB_WRITEBACK, nr);
796 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
801 * Determine the number of bytes of data the page contains
804 unsigned int nfs_page_length(struct page *page)
806 loff_t i_size = i_size_read(page_file_mapping(page)->host);
809 pgoff_t index = page_index(page);
810 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
811 if (index < end_index)
813 if (index == end_index)
814 return ((i_size - 1) & ~PAGE_MASK) + 1;
820 * Determine the number of bytes of data the page contains
822 static inline size_t nfs_folio_length(struct folio *folio)
824 loff_t i_size = i_size_read(folio_file_mapping(folio)->host);
827 pgoff_t index = folio_index(folio) >> folio_order(folio);
828 pgoff_t end_index = (i_size - 1) >> folio_shift(folio);
829 if (index < end_index)
830 return folio_size(folio);
831 if (index == end_index)
832 return offset_in_folio(folio, i_size - 1) + 1;
838 * Convert a umode to a dirent->d_type
841 unsigned char nfs_umode_to_dtype(umode_t mode)
843 return (mode >> 12) & 15;
847 * Determine the number of pages in an array of length 'len' and
848 * with a base offset of 'base'
850 static inline unsigned int nfs_page_array_len(unsigned int base, size_t len)
852 return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >>
857 * Convert a struct timespec64 into a 64-bit change attribute
859 * This does approximately the same thing as timespec64_to_ns(),
860 * but for calculation efficiency, we multiply the seconds by
864 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
866 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
870 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
872 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
873 NFS4_STATEID_OTHER_SIZE);
876 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
882 static inline bool nfs_error_is_fatal(int err)
903 static inline bool nfs_error_is_fatal_on_server(int err)
912 return nfs_error_is_fatal(err);
916 * Select between a default port value and a user-specified port value.
917 * If a zero value is set, then autobind will be used.
919 static inline void nfs_set_port(struct sockaddr_storage *sap, int *port,
920 const unsigned short default_port)
922 if (*port == NFS_UNSPEC_PORT)
923 *port = default_port;
925 rpc_set_port((struct sockaddr *)sap, *port);
928 struct nfs_direct_req {
929 struct kref kref; /* release manager */
932 struct nfs_open_context *ctx; /* file open context info */
933 struct nfs_lock_context *l_ctx; /* Lock context info */
934 struct kiocb * iocb; /* controlling i/o request */
935 struct inode * inode; /* target file of i/o */
937 /* completion state */
938 atomic_t io_count; /* i/os we're waiting for */
939 spinlock_t lock; /* protect completion state */
941 loff_t io_start; /* Start offset for I/O */
942 ssize_t count, /* bytes actually processed */
943 max_count, /* max expected count */
944 error; /* any reported error */
945 struct completion completion; /* wait for i/o completion */
948 struct nfs_mds_commit_info mds_cinfo; /* Storage for cinfo */
949 struct pnfs_ds_commit_info ds_cinfo; /* Storage for cinfo */
950 struct work_struct work;
953 #define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply was received */
954 #define NFS_ODIRECT_RESCHED_WRITES (2) /* write verification failed */
956 #define NFS_ODIRECT_SHOULD_DIRTY (3) /* dirty user-space page after read */
957 #define NFS_ODIRECT_DONE INT_MAX /* write verification failed */