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 struct nfsd_file;
38 
39 /*
40  * Callback function for readdir
41  */
42 typedef int (*nfsd_filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
43 
44 /* nfsd/vfs.c */
45 int		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, time64_t);
54 int 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 svc_rqst *rqstp,
61 				       struct nfsd_file *nf_src, u64 src_pos,
62 				       struct nfsd_file *nf_dst, u64 dst_pos,
63 				       u64 count, bool sync);
64 #endif /* CONFIG_NFSD_V4 */
65 __be32		nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
66 				char *name, int len, struct iattr *attrs,
67 				int type, dev_t rdev, struct svc_fh *res);
68 __be32		nfsd_create(struct svc_rqst *, struct svc_fh *,
69 				char *name, int len, struct iattr *attrs,
70 				int type, dev_t rdev, struct svc_fh *res);
71 __be32		nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
72 __be32		nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
73 				struct svc_fh *resfhp, struct iattr *iap);
74 __be32		nfsd_commit(struct svc_rqst *rqst, struct svc_fh *fhp,
75 				u64 offset, u32 count, __be32 *verf);
76 #ifdef CONFIG_NFSD_V4
77 __be32		nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
78 			    char *name, void **bufp, int *lenp);
79 __be32		nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
80 			    char **bufp, int *lenp);
81 __be32		nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
82 			    char *name);
83 __be32		nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
84 			    char *name, void *buf, u32 len, u32 flags);
85 #endif
86 int 		nfsd_open_break_lease(struct inode *, int);
87 __be32		nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
88 				int, struct file **);
89 __be32		nfsd_open_verified(struct svc_rqst *, struct svc_fh *,
90 				int, struct file **);
91 __be32		nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
92 				struct file *file, loff_t offset,
93 				unsigned long *count,
94 				u32 *eof);
95 __be32		nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp,
96 				struct file *file, loff_t offset,
97 				struct kvec *vec, int vlen,
98 				unsigned long *count,
99 				u32 *eof);
100 __be32 		nfsd_read(struct svc_rqst *, struct svc_fh *,
101 				loff_t, struct kvec *, int, unsigned long *,
102 				u32 *eof);
103 __be32 		nfsd_write(struct svc_rqst *, struct svc_fh *, loff_t,
104 				struct kvec *, int, unsigned long *,
105 				int stable, __be32 *verf);
106 __be32		nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
107 				struct nfsd_file *nf, loff_t offset,
108 				struct kvec *vec, int vlen, unsigned long *cnt,
109 				int stable, __be32 *verf);
110 __be32		nfsd_readlink(struct svc_rqst *, struct svc_fh *,
111 				char *, int *);
112 __be32		nfsd_symlink(struct svc_rqst *, struct svc_fh *,
113 				char *name, int len, char *path,
114 				struct svc_fh *res);
115 __be32		nfsd_link(struct svc_rqst *, struct svc_fh *,
116 				char *, int, struct svc_fh *);
117 ssize_t		nfsd_copy_file_range(struct file *, u64,
118 				     struct file *, u64, u64);
119 __be32		nfsd_rename(struct svc_rqst *,
120 				struct svc_fh *, char *, int,
121 				struct svc_fh *, char *, int);
122 __be32		nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
123 				char *name, int len);
124 __be32		nfsd_readdir(struct svc_rqst *, struct svc_fh *,
125 			     loff_t *, struct readdir_cd *, nfsd_filldir_t);
126 __be32		nfsd_statfs(struct svc_rqst *, struct svc_fh *,
127 				struct kstatfs *, int access);
128 
129 __be32		nfsd_permission(struct svc_rqst *, struct svc_export *,
130 				struct dentry *, int);
131 
fh_want_write(struct svc_fh * fh)132 static inline int fh_want_write(struct svc_fh *fh)
133 {
134 	int ret;
135 
136 	if (fh->fh_want_write)
137 		return 0;
138 	ret = mnt_want_write(fh->fh_export->ex_path.mnt);
139 	if (!ret)
140 		fh->fh_want_write = true;
141 	return ret;
142 }
143 
fh_drop_write(struct svc_fh * fh)144 static inline void fh_drop_write(struct svc_fh *fh)
145 {
146 	if (fh->fh_want_write) {
147 		fh->fh_want_write = false;
148 		mnt_drop_write(fh->fh_export->ex_path.mnt);
149 	}
150 }
151 
fh_getattr(const struct svc_fh * fh,struct kstat * stat)152 static inline __be32 fh_getattr(const struct svc_fh *fh, struct kstat *stat)
153 {
154 	struct path p = {.mnt = fh->fh_export->ex_path.mnt,
155 			 .dentry = fh->fh_dentry};
156 	return nfserrno(vfs_getattr(&p, stat, STATX_BASIC_STATS,
157 				    AT_STATX_SYNC_AS_STAT));
158 }
159 
160 #endif /* LINUX_NFSD_VFS_H */
161