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xfs: fix dquot isolation hang
[linux-block.git] / fs / nfs / internal.h
CommitLineData
f7b422b1
DH		 1/*
2 * NFS internal definitions
3 */
4
eedc020e 5#include "nfs4_fs.h"
f7b422b1 6#include <linux/mount.h>
f9c3a380 7#include <linux/security.h>
1264a2f0 8#include <linux/crc32.h>
f7b422b1 9
08734048
DH		 10#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
11
54ceac45 12struct nfs_string;
54ceac45
DH		 13
14/* Maximum number of readahead requests
15 * FIXME: this should really be a sysctl so that users may tune it to suit
16 * their needs. People that do NFS over a slow network, might for
17 * instance want to reduce it to something closer to 1 for improved
18 * interactive response.
19 */
20#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
21
7ebb9315
BS		 22static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
23{
24 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
25 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
26}
27
533eb461
AA		 28static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
29{
30 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
31 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
32 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
33 return 0;
34
35 fattr->fileid = fattr->mounted_on_fileid;
36 return 1;
37}
38
f7b422b1
DH		 39struct nfs_clone_mount {
40 const struct super_block *sb;
41 const struct dentry *dentry;
42 struct nfs_fh *fh;
43 struct nfs_fattr *fattr;
44 char *hostname;
45 char *mnt_path;
6677d095
CL		 46 struct sockaddr *addr;
47 size_t addrlen;
f7b422b1
DH		 48 rpc_authflavor_t authflavor;
49};
50
a14017db
CL		 51/*
52 * Note: RFC 1813 doesn't limit the number of auth flavors that
53 * a server can return, so make something up.
54 */
55#define NFS_MAX_SECFLAVORS (12)
56
4cfd74fc
CL		 57/*
58 * Value used if the user did not specify a port value.
59 */
60#define NFS_UNSPEC_PORT (-1)
61
56e4ebf8
BS		 62/*
63 * Maximum number of pages that readdir can use for creating
64 * a vmapped array of pages.
65 */
66#define NFS_MAX_READDIR_PAGES 8
67
fcf10398
BS		 68struct nfs_client_initdata {
69 unsigned long init_flags;
70 const char *hostname;
71 const struct sockaddr *addr;
72 size_t addrlen;
ab7017a3 73 struct nfs_subversion *nfs_mod;
fcf10398
BS		 74 int proto;
75 u32 minorversion;
76 struct net *net;
77};
78
6b18eaa0
TT		 79/*
80 * In-kernel mount arguments
81 */
82struct nfs_parsed_mount_data {
83 int flags;
8cb7f74e
CL		 84 unsigned int rsize, wsize;
85 unsigned int timeo, retrans;
86 unsigned int acregmin, acregmax,
6b18eaa0 87 acdirmin, acdirmax;
8cb7f74e 88 unsigned int namlen;
b797cac7 89 unsigned int options;
6b18eaa0
TT		 90 unsigned int bsize;
91 unsigned int auth_flavor_len;
92 rpc_authflavor_t auth_flavors[1];
93 char *client_address;
764302cc 94 unsigned int version;
3fd5be9e 95 unsigned int minorversion;
08734048 96 char *fscache_uniq;
b72e4f42 97 bool need_mount;
6b18eaa0
TT		 98
99 struct {
4c568017
CL		 100 struct sockaddr_storage address;
101 size_t addrlen;
6b18eaa0 102 char *hostname;
78fa701f 103 u32 version;
4cfd74fc 104 int port;
78fa701f 105 unsigned short protocol;
6b18eaa0
TT		 106 } mount_server;
107
108 struct {
4c568017
CL		 109 struct sockaddr_storage address;
110 size_t addrlen;
6b18eaa0
TT		 111 char *hostname;
112 char *export_path;
4cfd74fc 113 int port;
78fa701f 114 unsigned short protocol;
6b18eaa0 115 } nfs_server;
f9c3a380
EP		 116
117 struct security_mnt_opts lsm_opts;
e50a7a1a 118 struct net *net;
6b18eaa0
TT		 119};
120
146ec944 121/* mount_clnt.c */
c5d120f8
CL		 122struct nfs_mount_request {
123 struct sockaddr *sap;
124 size_t salen;
125 char *hostname;
126 char *dirpath;
127 u32 version;
128 unsigned short protocol;
129 struct nfs_fh *fh;
50a737f8 130 int noresvport;
8e02f6b9
CL		 131 unsigned int *auth_flav_len;
132 rpc_authflavor_t *auth_flavs;
6d59b8d5 133 struct net *net;
c5d120f8
CL		 134};
135
fbdefd64
BS		 136struct nfs_mount_info {
137 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
138 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
139 struct nfs_parsed_mount_data *parsed;
140 struct nfs_clone_mount *cloned;
141 struct nfs_fh *mntfh;
142};
143
c5d120f8 144extern int nfs_mount(struct nfs_mount_request *info);
0b524123 145extern void nfs_umount(const struct nfs_mount_request *info);
146ec944 146
24c8dbbb 147/* client.c */
a613fa16 148extern const struct rpc_program nfs_program;
6b13168b 149extern void nfs_clients_init(struct net *net);
6663ee7f 150extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
428360d7 151int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
fcf10398
BS		 152struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
153 const struct rpc_timeout *, const char *,
154 rpc_authflavor_t);
155int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
156void nfs_server_insert_lists(struct nfs_server *);
157void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
158int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
159 rpc_authflavor_t);
160struct nfs_server *nfs_alloc_server(void);
161void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
54ceac45 162
28cd1b3f 163extern void nfs_cleanup_cb_ident_idr(struct net *);
24c8dbbb 164extern void nfs_put_client(struct nfs_client *);
cdb7eced 165extern void nfs_free_client(struct nfs_client *);
28cd1b3f 166extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
c36fca52 167extern struct nfs_client *
c7add9a9 168nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
459de2ed 169 struct nfs4_sessionid *, u32);
1179acc6 170extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
ab7017a3 171 struct nfs_subversion *);
91ea40b9 172extern struct nfs_server *nfs4_create_server(
1179acc6
BS		 173 struct nfs_mount_info *,
174 struct nfs_subversion *);
54ceac45
DH		 175extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
176 struct nfs_fh *);
177extern void nfs_free_server(struct nfs_server *server);
178extern struct nfs_server *nfs_clone_server(struct nfs_server *,
179 struct nfs_fh *,
7e6eb683
BS		 180 struct nfs_fattr *,
181 rpc_authflavor_t);
4697bd5e 182extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
76db6d95 183extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
d83217c1
AA		 184extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
185 const struct sockaddr *ds_addr,
98fc685a
AA		 186 int ds_addrlen, int ds_proto,
187 unsigned int ds_timeo,
188 unsigned int ds_retrans);
0e20162e
AA		 189extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
190 struct inode *);
6aaca566
DH		 191#ifdef CONFIG_PROC_FS
192extern int __init nfs_fs_proc_init(void);
193extern void nfs_fs_proc_exit(void);
194#else
195static inline int nfs_fs_proc_init(void)
196{
197 return 0;
198}
199static inline void nfs_fs_proc_exit(void)
200{
201}
202#endif
24c8dbbb 203
fcf10398
BS		 204#ifdef CONFIG_NFS_V4_1
205int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
206#endif
207
1179acc6 208/* nfs3client.c */
1c606fb7 209#if IS_ENABLED(CONFIG_NFS_V3)
1179acc6
BS		 210struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
211struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
212 struct nfs_fattr *, rpc_authflavor_t);
213#endif
214
f7b422b1
DH		 215/* callback_xdr.c */
216extern struct svc_version nfs4_callback_version1;
07bccc2d 217extern struct svc_version nfs4_callback_version4;
f7b422b1 218
4db6e0b7 219struct nfs_pageio_descriptor;
f7b422b1
DH		 220/* pagelist.c */
221extern int __init nfs_init_nfspagecache(void);
266bee88 222extern void nfs_destroy_nfspagecache(void);
f7b422b1 223extern int __init nfs_init_readpagecache(void);
266bee88 224extern void nfs_destroy_readpagecache(void);
f7b422b1 225extern int __init nfs_init_writepagecache(void);
266bee88 226extern void nfs_destroy_writepagecache(void);
f7b422b1 227
f7b422b1 228extern int __init nfs_init_directcache(void);
266bee88 229extern void nfs_destroy_directcache(void);
30dd374f 230extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
4db6e0b7
FI		 231extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
232 struct nfs_pgio_header *hdr,
233 void (*release)(struct nfs_pgio_header *hdr));
234void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
577b4232
TM		 235int nfs_iocounter_wait(struct nfs_io_counter *c);
236
237static inline void nfs_iocounter_init(struct nfs_io_counter *c)
238{
239 c->flags = 0;
240 atomic_set(&c->io_count, 0);
241}
f7b422b1
DH		 242
243/* nfs2xdr.c */
244extern struct rpc_procinfo nfs_procedures[];
573c4e1e
CL		 245extern int nfs2_decode_dirent(struct xdr_stream *,
246 struct nfs_entry *, int);
f7b422b1
DH		 247
248/* nfs3xdr.c */
249extern struct rpc_procinfo nfs3_procedures[];
573c4e1e
CL		 250extern int nfs3_decode_dirent(struct xdr_stream *,
251 struct nfs_entry *, int);
f7b422b1
DH		 252
253/* nfs4xdr.c */
89d77c8f 254#if IS_ENABLED(CONFIG_NFS_V4)
573c4e1e
CL		 255extern int nfs4_decode_dirent(struct xdr_stream *,
256 struct nfs_entry *, int);
7d4e2747 257#endif
2449ea2e
AB		 258#ifdef CONFIG_NFS_V4_1
259extern const u32 nfs41_maxread_overhead;
260extern const u32 nfs41_maxwrite_overhead;
f1c097be 261extern const u32 nfs41_maxgetdevinfo_overhead;
2449ea2e 262#endif
f7b422b1
DH		 263
264/* nfs4proc.c */
89d77c8f 265#if IS_ENABLED(CONFIG_NFS_V4)
f7b422b1 266extern struct rpc_procinfo nfs4_procedures[];
d75d5414 267#endif
f7b422b1 268
7fe5c398
TM		 269/* proc.c */
270void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
8cab4c39 271extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
45a52a02 272 const struct rpc_timeout *timeparms,
f8407299 273 const char *ip_addr);
7fe5c398 274
979df72e 275/* dir.c */
7f8275d0 276extern int nfs_access_cache_shrinker(struct shrinker *shrink,
1495f230 277 struct shrink_control *sc);
597d9289
BS		 278struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
279int nfs_create(struct inode *, struct dentry *, umode_t, bool);
280int nfs_mkdir(struct inode *, struct dentry *, umode_t);
281int nfs_rmdir(struct inode *, struct dentry *);
282int nfs_unlink(struct inode *, struct dentry *);
283int nfs_symlink(struct inode *, struct dentry *, const char *);
284int nfs_link(struct dentry *, struct inode *, struct dentry *);
285int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
286int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
979df72e 287
ce4ef7c0
BS		 288/* file.c */
289int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
290loff_t nfs_file_llseek(struct file *, loff_t, int);
291int nfs_file_flush(struct file *, fl_owner_t);
292ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
293ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
294 size_t, unsigned int);
295int nfs_file_mmap(struct file *, struct vm_area_struct *);
296ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
297int nfs_file_release(struct inode *, struct file *);
298int nfs_lock(struct file *, int, struct file_lock *);
299int nfs_flock(struct file *, int, struct file_lock *);
300ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
301 size_t, unsigned int);
302int nfs_check_flags(int);
303int nfs_setlease(struct file *, long, struct file_lock **);
304
f7b422b1 305/* inode.c */
5746006f 306extern struct workqueue_struct *nfsiod_workqueue;
f7b422b1
DH		 307extern struct inode *nfs_alloc_inode(struct super_block *sb);
308extern void nfs_destroy_inode(struct inode *);
a9185b41 309extern int nfs_write_inode(struct inode *, struct writeback_control *);
eed99357 310extern int nfs_drop_inode(struct inode *);
19d87ca3 311extern void nfs_clear_inode(struct inode *);
b57922d9 312extern void nfs_evict_inode(struct inode *);
f41f7418 313void nfs_zap_acl_cache(struct inode *inode);
72cb77f4 314extern int nfs_wait_bit_killable(void *word);
f7b422b1
DH		 315
316/* super.c */
6a74490d 317extern const struct super_operations nfs_sops;
ab7017a3 318extern struct file_system_type nfs_fs_type;
54ceac45 319extern struct file_system_type nfs_xdev_fs_type;
89d77c8f 320#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45
DH		 321extern struct file_system_type nfs4_xdev_fs_type;
322extern struct file_system_type nfs4_referral_fs_type;
f7b422b1 323#endif
ff9099f2
BS		 324struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
325 struct nfs_subversion *);
fbdefd64
BS		 326void nfs_initialise_sb(struct super_block *);
327int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
328int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
ab7017a3
BS		 329struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
330 struct nfs_mount_info *, struct nfs_subversion *);
fbdefd64
BS		 331struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
332struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
333 const char *, struct nfs_mount_info *);
334void nfs_kill_super(struct super_block *);
335void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
4ebd9ab3 336
f7b422b1 337extern struct rpc_stat nfs_rpcstat;
4ebd9ab3 338
f7b422b1
DH		 339extern int __init register_nfs_fs(void);
340extern void __exit unregister_nfs_fs(void);
1daef0a8
TM		 341extern void nfs_sb_active(struct super_block *sb);
342extern void nfs_sb_deactive(struct super_block *sb);
f7b422b1
DH		 343
344/* namespace.c */
97a54868 345#define NFS_PATH_CANONICAL 1
b514f872 346extern char *nfs_path(char **p, struct dentry *dentry,
97a54868 347 char *buffer, ssize_t buflen, unsigned flags);
36d43a43 348extern struct vfsmount *nfs_d_automount(struct path *path);
281cad46
BS		 349struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
350 struct nfs_fh *, struct nfs_fattr *);
351struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
352 struct nfs_fattr *, rpc_authflavor_t);
f7b422b1 353
54ceac45 354/* getroot.c */
0d5839ad
AV		 355extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
356 const char *);
89d77c8f 357#if IS_ENABLED(CONFIG_NFS_V4)
0d5839ad
AV		 358extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
359 const char *);
54ceac45 360
5e6b1990 361extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
7d4e2747 362#endif
f7b422b1 363
061ae2ed 364struct nfs_pgio_completion_ops;
f11c88af 365/* read.c */
4db6e0b7 366extern struct nfs_read_header *nfs_readhdr_alloc(void);
cd841605 367extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
584aa810
FI		 368extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
369 struct inode *inode,
370 const struct nfs_pgio_completion_ops *compl_ops);
c5996c4e
FI		 371extern int nfs_initiate_read(struct rpc_clnt *clnt,
372 struct nfs_read_data *data,
9f0ec176 373 const struct rpc_call_ops *call_ops, int flags);
f11c88af 374extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
493292dd 375extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
4db6e0b7 376 struct nfs_pgio_header *hdr);
493292dd
TM		 377extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
378extern void nfs_readdata_release(struct nfs_read_data *rdata);
e885de1a 379
fbdefd64
BS		 380/* super.c */
381void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
382void nfs_umount_begin(struct super_block *);
383int nfs_statfs(struct dentry *, struct kstatfs *);
384int nfs_show_options(struct seq_file *, struct dentry *);
385int nfs_show_devname(struct seq_file *, struct dentry *);
386int nfs_show_path(struct seq_file *, struct dentry *);
387int nfs_show_stats(struct seq_file *, struct dentry *);
388void nfs_put_super(struct super_block *);
389int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
390
def6ed7e 391/* write.c */
1763da12
FI		 392extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
393 struct inode *inode, int ioflags,
394 const struct nfs_pgio_completion_ops *compl_ops);
6c75dc0d 395extern struct nfs_write_header *nfs_writehdr_alloc(void);
cd841605 396extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
dce81290 397extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
6c75dc0d 398 struct nfs_pgio_header *hdr);
dce81290
TM		 399extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
400extern void nfs_writedata_release(struct nfs_write_data *wdata);
0b7c0153 401extern void nfs_commit_free(struct nfs_commit_data *p);
c5996c4e
FI		 402extern int nfs_initiate_write(struct rpc_clnt *clnt,
403 struct nfs_write_data *data,
a69aef14 404 const struct rpc_call_ops *call_ops,
9f0ec176 405 int how, int flags);
def6ed7e 406extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
0b7c0153
FI		 407extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
408extern int nfs_initiate_commit(struct rpc_clnt *clnt,
409 struct nfs_commit_data *data,
e0c2b380 410 const struct rpc_call_ops *call_ops,
9f0ec176 411 int how, int flags);
0b7c0153 412extern void nfs_init_commit(struct nfs_commit_data *data,
e0c2b380 413 struct list_head *head,
f453a54a
FI		 414 struct pnfs_layout_segment *lseg,
415 struct nfs_commit_info *cinfo);
1763da12
FI		 416int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
417 struct nfs_commit_info *cinfo, int max);
418int nfs_scan_commit(struct inode *inode, struct list_head *dst,
419 struct nfs_commit_info *cinfo);
420void nfs_mark_request_commit(struct nfs_page *req,
421 struct pnfs_layout_segment *lseg,
422 struct nfs_commit_info *cinfo);
423int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
424 int how, struct nfs_commit_info *cinfo);
e0c2b380 425void nfs_retry_commit(struct list_head *page_list,
ea2cf228
FI		 426 struct pnfs_layout_segment *lseg,
427 struct nfs_commit_info *cinfo);
0b7c0153 428void nfs_commitdata_release(struct nfs_commit_data *data);
ea2cf228
FI		 429void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
430 struct nfs_commit_info *cinfo);
431void nfs_request_remove_commit_list(struct nfs_page *req,
432 struct nfs_commit_info *cinfo);
433void nfs_init_cinfo(struct nfs_commit_info *cinfo,
434 struct inode *inode,
435 struct nfs_direct_req *dreq);
dc24826b
AA		 436int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
437bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
e0c2b380 438
074cc1de
TM		 439#ifdef CONFIG_MIGRATION
440extern int nfs_migrate_page(struct address_space *,
a6bc32b8 441 struct page *, struct page *, enum migrate_mode);
074cc1de
TM		 442#else
443#define nfs_migrate_page NULL
444#endif
def6ed7e 445
1763da12
FI		 446/* direct.c */
447void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
448 struct nfs_direct_req *dreq);
1d59d61f
TM		 449static inline void nfs_inode_dio_wait(struct inode *inode)
450{
451 inode_dio_wait(inode);
452}
6296556f 453extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
1763da12 454
cccef3b9 455/* nfs4proc.c */
d20581aa 456extern void __nfs4_read_done_cb(struct nfs_read_data *);
8cab4c39 457extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
45a52a02 458 const struct rpc_timeout *timeparms,
f8407299 459 const char *ip_addr);
05f4c350
CL		 460extern int nfs40_walk_client_list(struct nfs_client *clp,
461 struct nfs_client **result,
462 struct rpc_cred *cred);
463extern int nfs41_walk_client_list(struct nfs_client *clp,
464 struct nfs_client **result,
465 struct rpc_cred *cred);
cccef3b9 466
f7b422b1
DH		 467/*
468 * Determine the device name as a string
469 */
b514f872 470static inline char *nfs_devname(struct dentry *dentry,
54ceac45 471 char *buffer, ssize_t buflen)
f7b422b1 472{
b514f872 473 char *dummy;
97a54868 474 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
f7b422b1
DH		 475}
476
477/*
478 * Determine the actual block size (and log2 thereof)
479 */
480static inline
481unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
482{
483 /* make sure blocksize is a power of two */
484 if ((bsize & (bsize - 1)) || nrbitsp) {
485 unsigned char nrbits;
486
487 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
488 ;
489 bsize = 1 << nrbits;
490 if (nrbitsp)
491 *nrbitsp = nrbits;
492 }
493
494 return bsize;
495}
496
497/*
498 * Calculate the number of 512byte blocks used.
499 */
9eaa67c6 500static inline blkcnt_t nfs_calc_block_size(u64 tsize)
f7b422b1 501{
9eaa67c6 502 blkcnt_t used = (tsize + 511) >> 9;
f7b422b1
DH		 503 return (used > ULONG_MAX) ? ULONG_MAX : used;
504}
505
506/*
507 * Compute and set NFS server blocksize
508 */
509static inline
510unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
511{
512 if (bsize < NFS_MIN_FILE_IO_SIZE)
513 bsize = NFS_DEF_FILE_IO_SIZE;
514 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
515 bsize = NFS_MAX_FILE_IO_SIZE;
516
517 return nfs_block_bits(bsize, nrbitsp);
518}
519
520/*
521 * Determine the maximum file size for a superblock
522 */
523static inline
524void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
525{
526 sb->s_maxbytes = (loff_t)maxfilesize;
527 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
528 sb->s_maxbytes = MAX_LFS_FILESIZE;
529}
49a70f27
TM		 530
531/*
532 * Determine the number of bytes of data the page contains
533 */
534static inline
535unsigned int nfs_page_length(struct page *page)
536{
d56b4ddf 537 loff_t i_size = i_size_read(page_file_mapping(page)->host);
49a70f27
TM		 538
539 if (i_size > 0) {
d56b4ddf 540 pgoff_t page_index = page_file_index(page);
49a70f27 541 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
d56b4ddf 542 if (page_index < end_index)
49a70f27 543 return PAGE_CACHE_SIZE;
d56b4ddf 544 if (page_index == end_index)
49a70f27
TM		 545 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
546 }
547 return 0;
548}
8d5658c9 549
0b26a0bf
TM		 550/*
551 * Convert a umode to a dirent->d_type
552 */
553static inline
554unsigned char nfs_umode_to_dtype(umode_t mode)
555{
556 return (mode >> 12) & 15;
557}
558
8d5658c9
TM		 559/*
560 * Determine the number of pages in an array of length 'len' and
561 * with a base offset of 'base'
562 */
563static inline
564unsigned int nfs_page_array_len(unsigned int base, size_t len)
565{
566 return ((unsigned long)len + (unsigned long)base +
567 PAGE_SIZE - 1) >> PAGE_SHIFT;
568}
0110ee15 569
3a1556e8
TM		 570/*
571 * Convert a struct timespec into a 64-bit change attribute
572 *
573 * This does approximately the same thing as timespec_to_ns(),
574 * but for calculation efficiency, we multiply the seconds by
575 * 1024*1024*1024.
576 */
577static inline
578u64 nfs_timespec_to_change_attr(const struct timespec *ts)
579{
580 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
581}
1264a2f0
TM		 582
583#ifdef CONFIG_CRC32
584/**
585 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
586 * @fh - pointer to filehandle
587 *
588 * returns a crc32 hash for the filehandle that is compatible with
589 * the one displayed by "wireshark".
590 */
591static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
592{
593 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
594}
595#else
596static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
597{
598 return 0;
599}
600#endif
Linux 6.x block layer and io_uring tree(s)