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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
4 */
5
6#ifndef LINUX_NFSD_VFS_H
7#define LINUX_NFSD_VFS_H
8
9#include "nfsfh.h"
10#include "nfsd.h"
11
12/*
13 * Flags for nfsd_permission
14 */
15#define NFSD_MAY_NOP 0
16#define NFSD_MAY_EXEC 0x001 /* == MAY_EXEC */
17#define NFSD_MAY_WRITE 0x002 /* == MAY_WRITE */
18#define NFSD_MAY_READ 0x004 /* == MAY_READ */
19#define NFSD_MAY_SATTR 0x008
20#define NFSD_MAY_TRUNC 0x010
21#define NFSD_MAY_LOCK 0x020
22#define NFSD_MAY_MASK 0x03f
23
24/* extra hints to permission and open routines: */
25#define NFSD_MAY_OWNER_OVERRIDE 0x040
26#define NFSD_MAY_LOCAL_ACCESS 0x080 /* for device special files */
27#define NFSD_MAY_BYPASS_GSS_ON_ROOT 0x100
28#define NFSD_MAY_NOT_BREAK_LEASE 0x200
29#define NFSD_MAY_BYPASS_GSS 0x400
30#define NFSD_MAY_READ_IF_EXEC 0x800
31
32#define NFSD_MAY_64BIT_COOKIE 0x1000 /* 64 bit readdir cookies for >= NFSv3 */
33
34#define NFSD_MAY_CREATE (NFSD_MAY_EXEC|NFSD_MAY_WRITE)
35#define NFSD_MAY_REMOVE (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
36
37/*
38 * Callback function for readdir
39 */
40typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
41
42/* nfsd/vfs.c */
43int nfsd_racache_init(int);
44void nfsd_racache_shutdown(void);
45int nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
46 struct svc_export **expp);
47__be32 nfsd_lookup(struct svc_rqst *, struct svc_fh *,
48 const char *, unsigned int, struct svc_fh *);
49__be32 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
50 const char *, unsigned int,
51 struct svc_export **, struct dentry **);
52__be32 nfsd_setattr(struct svc_rqst *, struct svc_fh *,
53 struct iattr *, int, time_t);
54int nfsd_mountpoint(struct dentry *, struct svc_export *);
55#ifdef CONFIG_NFSD_V4
56__be32 nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
57 struct xdr_netobj *);
58__be32 nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
59 struct file *, loff_t, loff_t, int);
60__be32 nfsd4_clone_file_range(struct file *, u64, struct file *,
61 u64, u64);
62#endif /* CONFIG_NFSD_V4 */
63__be32 nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
64 char *name, int len, struct iattr *attrs,
65 int type, dev_t rdev, struct svc_fh *res);
66__be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
67 char *name, int len, struct iattr *attrs,
68 int type, dev_t rdev, struct svc_fh *res);
69#ifdef CONFIG_NFSD_V3
70__be32 nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
71__be32 do_nfsd_create(struct svc_rqst *, struct svc_fh *,
72 char *name, int len, struct iattr *attrs,
73 struct svc_fh *res, int createmode,
74 u32 *verifier, bool *truncp, bool *created);
75__be32 nfsd_commit(struct svc_rqst *, struct svc_fh *,
76 loff_t, unsigned long);
77#endif /* CONFIG_NFSD_V3 */
78__be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
79 int, struct file **);
80struct raparms;
81__be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
82 struct file *file, loff_t offset,
83 unsigned long *count);
84__be32 nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp,
85 struct file *file, loff_t offset,
86 struct kvec *vec, int vlen,
87 unsigned long *count);
88__be32 nfsd_read(struct svc_rqst *, struct svc_fh *,
89 loff_t, struct kvec *, int, unsigned long *);
90__be32 nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
91 struct kvec *, int, unsigned long *, int);
92__be32 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
93 struct file *file, loff_t offset,
94 struct kvec *vec, int vlen, unsigned long *cnt,
95 int stable);
96__be32 nfsd_readlink(struct svc_rqst *, struct svc_fh *,
97 char *, int *);
98__be32 nfsd_symlink(struct svc_rqst *, struct svc_fh *,
99 char *name, int len, char *path,
100 struct svc_fh *res);
101__be32 nfsd_link(struct svc_rqst *, struct svc_fh *,
102 char *, int, struct svc_fh *);
103ssize_t nfsd_copy_file_range(struct file *, u64,
104 struct file *, u64, u64);
105__be32 nfsd_rename(struct svc_rqst *,
106 struct svc_fh *, char *, int,
107 struct svc_fh *, char *, int);
108__be32 nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
109 char *name, int len);
110__be32 nfsd_readdir(struct svc_rqst *, struct svc_fh *,
111 loff_t *, struct readdir_cd *, nfsd_filldir_t);
112__be32 nfsd_statfs(struct svc_rqst *, struct svc_fh *,
113 struct kstatfs *, int access);
114
115__be32 nfsd_permission(struct svc_rqst *, struct svc_export *,
116 struct dentry *, int);
117
118struct raparms *nfsd_init_raparms(struct file *file);
119void nfsd_put_raparams(struct file *file, struct raparms *ra);
120
121static inline int fh_want_write(struct svc_fh *fh)
122{
123 int ret;
124
125 if (fh->fh_want_write)
126 return 0;
127 ret = mnt_want_write(fh->fh_export->ex_path.mnt);
128 if (!ret)
129 fh->fh_want_write = true;
130 return ret;
131}
132
133static inline void fh_drop_write(struct svc_fh *fh)
134{
135 if (fh->fh_want_write) {
136 fh->fh_want_write = false;
137 mnt_drop_write(fh->fh_export->ex_path.mnt);
138 }
139}
140
141static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
142{
143 struct path p = {.mnt = fh->fh_export->ex_path.mnt,
144 .dentry = fh->fh_dentry};
145 return nfserrno(vfs_getattr(&p, stat, STATX_BASIC_STATS,
146 AT_STATX_SYNC_AS_STAT));
147}
148
149static inline int nfsd_create_is_exclusive(int createmode)
150{
151 return createmode == NFS3_CREATE_EXCLUSIVE
152 || createmode == NFS4_CREATE_EXCLUSIVE4_1;
153}
154
155static inline bool nfsd_eof_on_read(long requested, long read,
156 loff_t offset, loff_t size)
157{
158 /* We assume a short read means eof: */
159 if (requested > read)
160 return true;
161 /*
162 * A non-short read might also reach end of file. The spec
163 * still requires us to set eof in that case.
164 *
165 * Further operations may have modified the file size since
166 * the read, so the following check is not atomic with the read.
167 * We've only seen that cause a problem for a client in the case
168 * where the read returned a count of 0 without setting eof.
169 * That case was fixed by the addition of the above check.
170 */
171 return (offset + read >= size);
172}
173
174#endif /* LINUX_NFSD_VFS_H */