summaryrefslogtreecommitdiff
path: root/fs/nfsd/vfs.h
blob: 57cd70062048f50fcdd5a85a983201464362935d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef LINUX_NFSD_VFS_H
#define LINUX_NFSD_VFS_H

#include <linux/fs.h>
#include <linux/posix_acl.h>
#include "nfsfh.h"
#include "nfsd.h"

/*
 * Flags for nfsd_permission
 */
#define NFSD_MAY_NOP			0
#define NFSD_MAY_EXEC			0x001 /* == MAY_EXEC */
#define NFSD_MAY_WRITE			0x002 /* == MAY_WRITE */
#define NFSD_MAY_READ			0x004 /* == MAY_READ */
#define NFSD_MAY_SATTR			0x008
#define NFSD_MAY_TRUNC			0x010
#define NFSD_MAY_LOCK			0x020
#define NFSD_MAY_MASK			0x03f

/* extra hints to permission and open routines: */
#define NFSD_MAY_OWNER_OVERRIDE		0x040
#define NFSD_MAY_LOCAL_ACCESS		0x080 /* for device special files */
#define NFSD_MAY_BYPASS_GSS_ON_ROOT	0x100
#define NFSD_MAY_NOT_BREAK_LEASE	0x200
#define NFSD_MAY_BYPASS_GSS		0x400
#define NFSD_MAY_READ_IF_EXEC		0x800

#define NFSD_MAY_64BIT_COOKIE		0x1000 /* 64 bit readdir cookies for >= NFSv3 */

#define NFSD_MAY_CREATE		(NFSD_MAY_EXEC|NFSD_MAY_WRITE)
#define NFSD_MAY_REMOVE		(NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)

struct nfsd_file;

/*
 * Callback function for readdir
 */
typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);

/* nfsd/vfs.c */
struct nfsd_attrs {
	struct iattr		*na_iattr;	/* input */
	struct xdr_netobj	*na_seclabel;	/* input */
	struct posix_acl	*na_pacl;	/* input */
	struct posix_acl	*na_dpacl;	/* input */

	int			na_labelerr;	/* output */
	int			na_aclerr;	/* output */
};

static inline void nfsd_attrs_free(struct nfsd_attrs *attrs)
{
	posix_acl_release(attrs->na_pacl);
	posix_acl_release(attrs->na_dpacl);
}

static inline bool nfsd_attrs_valid(struct nfsd_attrs *attrs)
{
	struct iattr *iap = attrs->na_iattr;

	return (iap->ia_valid || (attrs->na_seclabel &&
		attrs->na_seclabel->len));
}

__be32		nfserrno (int errno);
int		nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
		                struct svc_export **expp);
__be32		nfsd_lookup(struct svc_rqst *, struct svc_fh *,
				const char *, unsigned int, struct svc_fh *);
__be32		 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
				const char *, unsigned int,
				struct svc_export **, struct dentry **);
__be32		nfsd_setattr(struct svc_rqst *, struct svc_fh *,
			     struct nfsd_attrs *, const struct timespec64 *);
int nfsd_mountpoint(struct dentry *, struct svc_export *);
#ifdef CONFIG_NFSD_V4
__be32		nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
				    struct file *, loff_t, loff_t, int);
__be32		nfsd4_clone_file_range(struct svc_rqst *rqstp,
				       struct nfsd_file *nf_src, u64 src_pos,
				       struct nfsd_file *nf_dst, u64 dst_pos,
				       u64 count, bool sync);
#endif /* CONFIG_NFSD_V4 */
__be32		nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
				struct nfsd_attrs *attrs, int type, dev_t rdev,
				struct svc_fh *res);
__be32		nfsd_create(struct svc_rqst *, struct svc_fh *,
				char *name, int len, struct nfsd_attrs *attrs,
				int type, dev_t rdev, struct svc_fh *res);
__be32		nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
__be32		nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
				struct svc_fh *resfhp, struct nfsd_attrs *iap);
__be32		nfsd_commit(struct svc_rqst *rqst, struct svc_fh *fhp,
				struct nfsd_file *nf, u64 offset, u32 count,
				__be32 *verf);
#ifdef CONFIG_NFSD_V4
__be32		nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
			    char *name, void **bufp, int *lenp);
__be32		nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
			    char **bufp, int *lenp);
__be32		nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
			    char *name);
__be32		nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
			    char *name, void *buf, u32 len, u32 flags);
#endif
int 		nfsd_open_break_lease(struct inode *, int);
__be32		nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
				int, struct file **);
int		nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp,
				   int may_flags, struct file **filp);
__be32		nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
				struct file *file, loff_t offset,
				unsigned long *count,
				u32 *eof);
__be32		nfsd_iter_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
				struct file *file, loff_t offset,
				unsigned long *count, unsigned int base,
				u32 *eof);
bool		nfsd_read_splice_ok(struct svc_rqst *rqstp);
__be32		nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
				loff_t offset, unsigned long *count,
				u32 *eof);
__be32 		nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
				struct kvec *, int, unsigned long *,
				int stable, __be32 *verf);
__be32		nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
				struct nfsd_file *nf, loff_t offset,
				struct kvec *vec, int vlen, unsigned long *cnt,
				int stable, __be32 *verf);
__be32		nfsd_readlink(struct svc_rqst *, struct svc_fh *,
				char *, int *);
__be32		nfsd_symlink(struct svc_rqst *, struct svc_fh *,
			     char *name, int len, char *path,
			     struct nfsd_attrs *attrs,
			     struct svc_fh *res);
__be32		nfsd_link(struct svc_rqst *, struct svc_fh *,
				char *, int, struct svc_fh *);
ssize_t		nfsd_copy_file_range(struct file *, u64,
				     struct file *, u64, u64);
__be32		nfsd_rename(struct svc_rqst *,
				struct svc_fh *, char *, int,
				struct svc_fh *, char *, int);
__be32		nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
				char *name, int len);
__be32		nfsd_readdir(struct svc_rqst *, struct svc_fh *,
			     loff_t *, struct readdir_cd *, nfsd_filldir_t);
__be32		nfsd_statfs(struct svc_rqst *, struct svc_fh *,
				struct kstatfs *, int access);

__be32		nfsd_permission(struct svc_rqst *, struct svc_export *,
				struct dentry *, int);

void		nfsd_filp_close(struct file *fp);

static inline int fh_want_write(struct svc_fh *fh)
{
	int ret;

	if (fh->fh_want_write)
		return 0;
	ret = mnt_want_write(fh->fh_export->ex_path.mnt);
	if (!ret)
		fh->fh_want_write = true;
	return ret;
}

static inline void fh_drop_write(struct svc_fh *fh)
{
	if (fh->fh_want_write) {
		fh->fh_want_write = false;
		mnt_drop_write(fh->fh_export->ex_path.mnt);
	}
}

static inline __be32 fh_getattr(const struct svc_fh *fh, struct kstat *stat)
{
	u32 request_mask = STATX_BASIC_STATS;
	struct path p = {.mnt = fh->fh_export->ex_path.mnt,
			 .dentry = fh->fh_dentry};

	if (fh->fh_maxsize == NFS4_FHSIZE)
		request_mask |= (STATX_BTIME | STATX_CHANGE_COOKIE);

	return nfserrno(vfs_getattr(&p, stat, request_mask,
				    AT_STATX_SYNC_AS_STAT));
}

#endif /* LINUX_NFSD_VFS_H */