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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/nfsd/nfsfh.h
1 /* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */
3 #ifndef _LINUX_NFSD_FH_INT_H
4 #define _LINUX_NFSD_FH_INT_H
6 #include <linux/nfsd/nfsfh.h>
24 extern enum fsid_source
fsid_source(struct svc_fh
*fhp
);
27 /* This might look a little large to "inline" but in all calls except
28 * one, 'vers' is constant so moste of the function disappears.
30 static inline void mk_fsid(int vers
, u32
*fsidv
, dev_t dev
, ino_t ino
,
31 u32 fsid
, unsigned char *uuid
)
36 fsidv
[0] = htonl((MAJOR(dev
)<<16) |
38 fsidv
[1] = ino_t_to_u32(ino
);
43 case FSID_MAJOR_MINOR
:
44 fsidv
[0] = htonl(MAJOR(dev
));
45 fsidv
[1] = htonl(MINOR(dev
));
46 fsidv
[2] = ino_t_to_u32(ino
);
50 fsidv
[0] = new_encode_dev(dev
);
51 fsidv
[1] = ino_t_to_u32(ino
);
55 /* 4 byte fsid and inode number */
57 fsidv
[0] = ino_t_to_u32(ino
);
58 fsidv
[1] = up
[0] ^ up
[1] ^ up
[2] ^ up
[3];
64 fsidv
[0] = up
[0] ^ up
[2];
65 fsidv
[1] = up
[1] ^ up
[3];
69 /* 16 byte fsid - NFSv3+ only */
70 memcpy(fsidv
, uuid
, 16);
73 case FSID_UUID16_INUM
:
74 /* 8 byte inode and 16 byte fsid */
75 *(u64
*)fsidv
= (u64
)ino
;
76 memcpy(fsidv
+2, uuid
, 16);
82 static inline int key_len(int type
)
85 case FSID_DEV
: return 8;
86 case FSID_NUM
: return 4;
87 case FSID_MAJOR_MINOR
: return 12;
88 case FSID_ENCODE_DEV
: return 8;
89 case FSID_UUID4_INUM
: return 8;
90 case FSID_UUID8
: return 8;
91 case FSID_UUID16
: return 16;
92 case FSID_UUID16_INUM
: return 24;
98 * Shorthand for dprintk()'s
100 extern char * SVCFH_fmt(struct svc_fh
*fhp
);
103 * Function prototypes
105 __be32
fh_verify(struct svc_rqst
*, struct svc_fh
*, umode_t
, int);
106 __be32
fh_compose(struct svc_fh
*, struct svc_export
*, struct dentry
*, struct svc_fh
*);
107 __be32
fh_update(struct svc_fh
*);
108 void fh_put(struct svc_fh
*);
110 static __inline__
struct svc_fh
*
111 fh_copy(struct svc_fh
*dst
, struct svc_fh
*src
)
113 WARN_ON(src
->fh_dentry
|| src
->fh_locked
);
120 fh_copy_shallow(struct knfsd_fh
*dst
, struct knfsd_fh
*src
)
122 dst
->fh_size
= src
->fh_size
;
123 memcpy(&dst
->fh_base
, &src
->fh_base
, src
->fh_size
);
126 static __inline__
struct svc_fh
*
127 fh_init(struct svc_fh
*fhp
, int maxsize
)
129 memset(fhp
, 0, sizeof(*fhp
));
130 fhp
->fh_maxsize
= maxsize
;
134 #ifdef CONFIG_NFSD_V3
136 * The wcc data stored in current_fh should be cleared
137 * between compound ops.
140 fh_clear_wcc(struct svc_fh
*fhp
)
142 fhp
->fh_post_saved
= 0;
143 fhp
->fh_pre_saved
= 0;
147 * Fill in the pre_op attr for the wcc data
150 fill_pre_wcc(struct svc_fh
*fhp
)
154 inode
= fhp
->fh_dentry
->d_inode
;
155 if (!fhp
->fh_pre_saved
) {
156 fhp
->fh_pre_mtime
= inode
->i_mtime
;
157 fhp
->fh_pre_ctime
= inode
->i_ctime
;
158 fhp
->fh_pre_size
= inode
->i_size
;
159 fhp
->fh_pre_change
= inode
->i_version
;
160 fhp
->fh_pre_saved
= 1;
164 extern void fill_post_wcc(struct svc_fh
*);
166 #define fh_clear_wcc(ignored)
167 #define fill_pre_wcc(ignored)
168 #define fill_post_wcc(notused)
169 #endif /* CONFIG_NFSD_V3 */
173 * Lock a file handle/inode
174 * NOTE: both fh_lock and fh_unlock are done "by hand" in
175 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
176 * so, any changes here should be reflected there.
180 fh_lock_nested(struct svc_fh
*fhp
, unsigned int subclass
)
182 struct dentry
*dentry
= fhp
->fh_dentry
;
187 if (fhp
->fh_locked
) {
188 printk(KERN_WARNING
"fh_lock: %pd2 already locked!\n",
193 inode
= dentry
->d_inode
;
194 mutex_lock_nested(&inode
->i_mutex
, subclass
);
200 fh_lock(struct svc_fh
*fhp
)
202 fh_lock_nested(fhp
, I_MUTEX_NORMAL
);
206 * Unlock a file handle/inode
209 fh_unlock(struct svc_fh
*fhp
)
211 if (fhp
->fh_locked
) {
213 mutex_unlock(&fhp
->fh_dentry
->d_inode
->i_mutex
);
218 #endif /* _LINUX_NFSD_FH_INT_H */