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 <linux/fs.h>
10 #include <linux/posix_acl.h>
11 #include "nfsfh.h"
12 #include "nfsd.h"
13
14 /*
15 * Flags for nfsd_permission
16 */
17 #define NFSD_MAY_NOP 0
18 #define NFSD_MAY_EXEC 0x001 /* == MAY_EXEC */
19 #define NFSD_MAY_WRITE 0x002 /* == MAY_WRITE */
20 #define NFSD_MAY_READ 0x004 /* == MAY_READ */
21 #define NFSD_MAY_SATTR 0x008
22 #define NFSD_MAY_TRUNC 0x010
23 #define NFSD_MAY_LOCK 0x020
24 #define NFSD_MAY_MASK 0x03f
25
26 /* extra hints to permission and open routines: */
27 #define NFSD_MAY_OWNER_OVERRIDE 0x040
28 #define NFSD_MAY_LOCAL_ACCESS 0x080 /* for device special files */
29 #define NFSD_MAY_BYPASS_GSS_ON_ROOT 0x100
30 #define NFSD_MAY_NOT_BREAK_LEASE 0x200
31 #define NFSD_MAY_BYPASS_GSS 0x400
32 #define NFSD_MAY_READ_IF_EXEC 0x800
33
34 #define NFSD_MAY_64BIT_COOKIE 0x1000 /* 64 bit readdir cookies for >= NFSv3 */
35
36 #define NFSD_MAY_CREATE (NFSD_MAY_EXEC|NFSD_MAY_WRITE)
37 #define NFSD_MAY_REMOVE (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
38
39 struct nfsd_file;
40
41 /*
42 * Callback function for readdir
43 */
44 typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
45
46 /* nfsd/vfs.c */
47 struct nfsd_attrs {
48 struct iattr *na_iattr; /* input */
49 struct xdr_netobj *na_seclabel; /* input */
50 struct posix_acl *na_pacl; /* input */
51 struct posix_acl *na_dpacl; /* input */
52
53 int na_labelerr; /* output */
54 int na_aclerr; /* output */
55 };
56
nfsd_attrs_free(struct nfsd_attrs * attrs)57 static inline void nfsd_attrs_free(struct nfsd_attrs *attrs)
58 {
59 posix_acl_release(attrs->na_pacl);
60 posix_acl_release(attrs->na_dpacl);
61 }
62
nfsd_attrs_valid(struct nfsd_attrs * attrs)63 static inline bool nfsd_attrs_valid(struct nfsd_attrs *attrs)
64 {
65 struct iattr *iap = attrs->na_iattr;
66
67 return (iap->ia_valid || (attrs->na_seclabel &&
68 attrs->na_seclabel->len));
69 }
70
71 __be32 nfserrno (int errno);
72 int nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
73 struct svc_export **expp);
74 __be32 nfsd_lookup(struct svc_rqst *, struct svc_fh *,
75 const char *, unsigned int, struct svc_fh *);
76 __be32 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
77 const char *, unsigned int,
78 struct svc_export **, struct dentry **);
79 __be32 nfsd_setattr(struct svc_rqst *, struct svc_fh *,
80 struct nfsd_attrs *, const struct timespec64 *);
81 int nfsd_mountpoint(struct dentry *, struct svc_export *);
82 #ifdef CONFIG_NFSD_V4
83 __be32 nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
84 struct file *, loff_t, loff_t, int);
85 __be32 nfsd4_clone_file_range(struct svc_rqst *rqstp,
86 struct nfsd_file *nf_src, u64 src_pos,
87 struct nfsd_file *nf_dst, u64 dst_pos,
88 u64 count, bool sync);
89 #endif /* CONFIG_NFSD_V4 */
90 __be32 nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
91 struct nfsd_attrs *attrs, int type, dev_t rdev,
92 struct svc_fh *res);
93 __be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
94 char *name, int len, struct nfsd_attrs *attrs,
95 int type, dev_t rdev, struct svc_fh *res);
96 __be32 nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
97 __be32 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
98 struct svc_fh *resfhp, struct nfsd_attrs *iap);
99 __be32 nfsd_commit(struct svc_rqst *rqst, struct svc_fh *fhp,
100 struct nfsd_file *nf, u64 offset, u32 count,
101 __be32 *verf);
102 #ifdef CONFIG_NFSD_V4
103 __be32 nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
104 char *name, void **bufp, int *lenp);
105 __be32 nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
106 char **bufp, int *lenp);
107 __be32 nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
108 char *name);
109 __be32 nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
110 char *name, void *buf, u32 len, u32 flags);
111 #endif
112 int nfsd_open_break_lease(struct inode *, int);
113 __be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
114 int, struct file **);
115 int nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp,
116 int may_flags, struct file **filp);
117 __be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
118 struct file *file, loff_t offset,
119 unsigned long *count,
120 u32 *eof);
121 __be32 nfsd_iter_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
122 struct file *file, loff_t offset,
123 unsigned long *count, unsigned int base,
124 u32 *eof);
125 bool nfsd_read_splice_ok(struct svc_rqst *rqstp);
126 __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
127 loff_t offset, unsigned long *count,
128 u32 *eof);
129 __be32 nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
130 struct kvec *, int, unsigned long *,
131 int stable, __be32 *verf);
132 __be32 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
133 struct nfsd_file *nf, loff_t offset,
134 struct kvec *vec, int vlen, unsigned long *cnt,
135 int stable, __be32 *verf);
136 __be32 nfsd_readlink(struct svc_rqst *, struct svc_fh *,
137 char *, int *);
138 __be32 nfsd_symlink(struct svc_rqst *, struct svc_fh *,
139 char *name, int len, char *path,
140 struct nfsd_attrs *attrs,
141 struct svc_fh *res);
142 __be32 nfsd_link(struct svc_rqst *, struct svc_fh *,
143 char *, int, struct svc_fh *);
144 ssize_t nfsd_copy_file_range(struct file *, u64,
145 struct file *, u64, u64);
146 __be32 nfsd_rename(struct svc_rqst *,
147 struct svc_fh *, char *, int,
148 struct svc_fh *, char *, int);
149 __be32 nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
150 char *name, int len);
151 __be32 nfsd_readdir(struct svc_rqst *, struct svc_fh *,
152 loff_t *, struct readdir_cd *, nfsd_filldir_t);
153 __be32 nfsd_statfs(struct svc_rqst *, struct svc_fh *,
154 struct kstatfs *, int access);
155
156 __be32 nfsd_permission(struct svc_rqst *, struct svc_export *,
157 struct dentry *, int);
158
159 void nfsd_filp_close(struct file *fp);
160
fh_want_write(struct svc_fh * fh)161 static inline int fh_want_write(struct svc_fh *fh)
162 {
163 int ret;
164
165 if (fh->fh_want_write)
166 return 0;
167 ret = mnt_want_write(fh->fh_export->ex_path.mnt);
168 if (!ret)
169 fh->fh_want_write = true;
170 return ret;
171 }
172
fh_drop_write(struct svc_fh * fh)173 static inline void fh_drop_write(struct svc_fh *fh)
174 {
175 if (fh->fh_want_write) {
176 fh->fh_want_write = false;
177 mnt_drop_write(fh->fh_export->ex_path.mnt);
178 }
179 }
180
fh_getattr(const struct svc_fh * fh,struct kstat * stat)181 static inline __be32 fh_getattr(const struct svc_fh *fh, struct kstat *stat)
182 {
183 u32 request_mask = STATX_BASIC_STATS;
184 struct path p = {.mnt = fh->fh_export->ex_path.mnt,
185 .dentry = fh->fh_dentry};
186
187 if (fh->fh_maxsize == NFS4_FHSIZE)
188 request_mask |= (STATX_BTIME | STATX_CHANGE_COOKIE);
189
190 return nfserrno(vfs_getattr(&p, stat, request_mask,
191 AT_STATX_SYNC_AS_STAT));
192 }
193
194 #endif /* LINUX_NFSD_VFS_H */
195