xref: /openbmc/linux/fs/nfsd/vfs.h (revision 5a86bf34)
1 /*
2  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
3  */
4 
5 #ifndef LINUX_NFSD_VFS_H
6 #define LINUX_NFSD_VFS_H
7 
8 #include "nfsfh.h"
9 #include "nfsd.h"
10 
11 /*
12  * Flags for nfsd_permission
13  */
14 #define NFSD_MAY_NOP			0
15 #define NFSD_MAY_EXEC			0x001 /* == MAY_EXEC */
16 #define NFSD_MAY_WRITE			0x002 /* == MAY_WRITE */
17 #define NFSD_MAY_READ			0x004 /* == MAY_READ */
18 #define NFSD_MAY_SATTR			0x008
19 #define NFSD_MAY_TRUNC			0x010
20 #define NFSD_MAY_LOCK			0x020
21 #define NFSD_MAY_MASK			0x03f
22 
23 /* extra hints to permission and open routines: */
24 #define NFSD_MAY_OWNER_OVERRIDE		0x040
25 #define NFSD_MAY_LOCAL_ACCESS		0x080 /* for device special files */
26 #define NFSD_MAY_BYPASS_GSS_ON_ROOT	0x100
27 #define NFSD_MAY_NOT_BREAK_LEASE	0x200
28 #define NFSD_MAY_BYPASS_GSS		0x400
29 #define NFSD_MAY_READ_IF_EXEC		0x800
30 
31 #define NFSD_MAY_64BIT_COOKIE		0x1000 /* 64 bit readdir cookies for >= NFSv3 */
32 
33 #define NFSD_MAY_CREATE		(NFSD_MAY_EXEC|NFSD_MAY_WRITE)
34 #define NFSD_MAY_REMOVE		(NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
35 
36 /*
37  * Callback function for readdir
38  */
39 typedef int (*nfsd_dirop_t)(struct inode *, struct dentry *, int, int);
40 
41 /* nfsd/vfs.c */
42 int		nfsd_racache_init(int);
43 void		nfsd_racache_shutdown(void);
44 int		nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
45 		                struct svc_export **expp);
46 __be32		nfsd_lookup(struct svc_rqst *, struct svc_fh *,
47 				const char *, unsigned int, struct svc_fh *);
48 __be32		 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
49 				const char *, unsigned int,
50 				struct svc_export **, struct dentry **);
51 __be32		nfsd_setattr(struct svc_rqst *, struct svc_fh *,
52 				struct iattr *, int, time_t);
53 int nfsd_mountpoint(struct dentry *, struct svc_export *);
54 #ifdef CONFIG_NFSD_V4
55 __be32          nfsd4_set_nfs4_label(struct svc_rqst *, struct svc_fh *,
56 		    struct xdr_netobj *);
57 #endif /* CONFIG_NFSD_V4 */
58 __be32		nfsd_create(struct svc_rqst *, struct svc_fh *,
59 				char *name, int len, struct iattr *attrs,
60 				int type, dev_t rdev, struct svc_fh *res);
61 #ifdef CONFIG_NFSD_V3
62 __be32		nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
63 __be32		do_nfsd_create(struct svc_rqst *, struct svc_fh *,
64 				char *name, int len, struct iattr *attrs,
65 				struct svc_fh *res, int createmode,
66 				u32 *verifier, bool *truncp, bool *created);
67 __be32		nfsd_commit(struct svc_rqst *, struct svc_fh *,
68 				loff_t, unsigned long);
69 #endif /* CONFIG_NFSD_V3 */
70 __be32		nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
71 				int, struct file **);
72 void		nfsd_close(struct file *);
73 __be32 		nfsd_read(struct svc_rqst *, struct svc_fh *,
74 				loff_t, struct kvec *, int, unsigned long *);
75 __be32 		nfsd_read_file(struct svc_rqst *, struct svc_fh *, struct file *,
76 				loff_t, struct kvec *, int, unsigned long *);
77 __be32 		nfsd_write(struct svc_rqst *, struct svc_fh *,struct file *,
78 				loff_t, struct kvec *,int, unsigned long *, int *);
79 __be32		nfsd_readlink(struct svc_rqst *, struct svc_fh *,
80 				char *, int *);
81 __be32		nfsd_symlink(struct svc_rqst *, struct svc_fh *,
82 				char *name, int len, char *path, int plen,
83 				struct svc_fh *res, struct iattr *);
84 __be32		nfsd_link(struct svc_rqst *, struct svc_fh *,
85 				char *, int, struct svc_fh *);
86 __be32		nfsd_rename(struct svc_rqst *,
87 				struct svc_fh *, char *, int,
88 				struct svc_fh *, char *, int);
89 __be32		nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
90 				char *name, int len);
91 __be32		nfsd_readdir(struct svc_rqst *, struct svc_fh *,
92 			     loff_t *, struct readdir_cd *, filldir_t);
93 __be32		nfsd_statfs(struct svc_rqst *, struct svc_fh *,
94 				struct kstatfs *, int access);
95 
96 __be32		nfsd_permission(struct svc_rqst *, struct svc_export *,
97 				struct dentry *, int);
98 
99 static inline int fh_want_write(struct svc_fh *fh)
100 {
101 	int ret = mnt_want_write(fh->fh_export->ex_path.mnt);
102 
103 	if (!ret)
104 		fh->fh_want_write = 1;
105 	return ret;
106 }
107 
108 static inline void fh_drop_write(struct svc_fh *fh)
109 {
110 	if (fh->fh_want_write) {
111 		fh->fh_want_write = 0;
112 		mnt_drop_write(fh->fh_export->ex_path.mnt);
113 	}
114 }
115 
116 static inline __be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
117 {
118 	struct path p = {.mnt = fh->fh_export->ex_path.mnt,
119 			 .dentry = fh->fh_dentry};
120 	return nfserrno(vfs_getattr(&p, stat));
121 }
122 
123 #endif /* LINUX_NFSD_VFS_H */
124