1 /* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */
2
3 #ifndef _LINUX_NFSD_FH_INT_H
4 #define _LINUX_NFSD_FH_INT_H
5
6 #include <linux/nfsd/nfsfh.h>
7
8 enum nfsd_fsid {
9 FSID_DEV = 0,
10 FSID_NUM,
11 FSID_MAJOR_MINOR,
12 FSID_ENCODE_DEV,
13 FSID_UUID4_INUM,
14 FSID_UUID8,
15 FSID_UUID16,
16 FSID_UUID16_INUM,
17 };
18
19 enum fsid_source {
20 FSIDSOURCE_DEV,
21 FSIDSOURCE_FSID,
22 FSIDSOURCE_UUID,
23 };
24 extern enum fsid_source fsid_source(struct svc_fh *fhp);
25
26
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.
29 */
mk_fsid(int vers,u32 * fsidv,dev_t dev,ino_t ino,u32 fsid,unsigned char * uuid)30 static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
31 u32 fsid, unsigned char *uuid)
32 {
33 u32 *up;
34 switch(vers) {
35 case FSID_DEV:
36 fsidv[0] = htonl((MAJOR(dev)<<16) |
37 MINOR(dev));
38 fsidv[1] = ino_t_to_u32(ino);
39 break;
40 case FSID_NUM:
41 fsidv[0] = fsid;
42 break;
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);
47 break;
48
49 case FSID_ENCODE_DEV:
50 fsidv[0] = new_encode_dev(dev);
51 fsidv[1] = ino_t_to_u32(ino);
52 break;
53
54 case FSID_UUID4_INUM:
55 /* 4 byte fsid and inode number */
56 up = (u32*)uuid;
57 fsidv[0] = ino_t_to_u32(ino);
58 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
59 break;
60
61 case FSID_UUID8:
62 /* 8 byte fsid */
63 up = (u32*)uuid;
64 fsidv[0] = up[0] ^ up[2];
65 fsidv[1] = up[1] ^ up[3];
66 break;
67
68 case FSID_UUID16:
69 /* 16 byte fsid - NFSv3+ only */
70 memcpy(fsidv, uuid, 16);
71 break;
72
73 case FSID_UUID16_INUM:
74 /* 8 byte inode and 16 byte fsid */
75 *(u64*)fsidv = (u64)ino;
76 memcpy(fsidv+2, uuid, 16);
77 break;
78 default: BUG();
79 }
80 }
81
key_len(int type)82 static inline int key_len(int type)
83 {
84 switch(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;
93 default: return 0;
94 }
95 }
96
97 /*
98 * Shorthand for dprintk()'s
99 */
100 extern char * SVCFH_fmt(struct svc_fh *fhp);
101
102 /*
103 * Function prototypes
104 */
105 __be32 fh_verify(struct svc_rqst *, struct svc_fh *, int, 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 *);
109
110 static __inline__ struct svc_fh *
fh_copy(struct svc_fh * dst,struct svc_fh * src)111 fh_copy(struct svc_fh *dst, struct svc_fh *src)
112 {
113 WARN_ON(src->fh_dentry || src->fh_locked);
114
115 *dst = *src;
116 return dst;
117 }
118
119 static inline void
fh_copy_shallow(struct knfsd_fh * dst,struct knfsd_fh * src)120 fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
121 {
122 dst->fh_size = src->fh_size;
123 memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
124 }
125
126 static __inline__ struct svc_fh *
fh_init(struct svc_fh * fhp,int maxsize)127 fh_init(struct svc_fh *fhp, int maxsize)
128 {
129 memset(fhp, 0, sizeof(*fhp));
130 fhp->fh_maxsize = maxsize;
131 return fhp;
132 }
133
134 #ifdef CONFIG_NFSD_V3
135 /*
136 * Fill in the pre_op attr for the wcc data
137 */
138 static inline void
fill_pre_wcc(struct svc_fh * fhp)139 fill_pre_wcc(struct svc_fh *fhp)
140 {
141 struct inode *inode;
142
143 inode = fhp->fh_dentry->d_inode;
144 if (!fhp->fh_pre_saved) {
145 fhp->fh_pre_mtime = inode->i_mtime;
146 fhp->fh_pre_ctime = inode->i_ctime;
147 fhp->fh_pre_size = inode->i_size;
148 fhp->fh_pre_change = inode->i_version;
149 fhp->fh_pre_saved = 1;
150 }
151 }
152
153 extern void fill_post_wcc(struct svc_fh *);
154 #else
155 #define fill_pre_wcc(ignored)
156 #define fill_post_wcc(notused)
157 #endif /* CONFIG_NFSD_V3 */
158
159
160 /*
161 * Lock a file handle/inode
162 * NOTE: both fh_lock and fh_unlock are done "by hand" in
163 * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
164 * so, any changes here should be reflected there.
165 */
166
167 static inline void
fh_lock_nested(struct svc_fh * fhp,unsigned int subclass)168 fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
169 {
170 struct dentry *dentry = fhp->fh_dentry;
171 struct inode *inode;
172
173 BUG_ON(!dentry);
174
175 if (fhp->fh_locked) {
176 printk(KERN_WARNING "fh_lock: %s/%s already locked!\n",
177 dentry->d_parent->d_name.name, dentry->d_name.name);
178 return;
179 }
180
181 inode = dentry->d_inode;
182 mutex_lock_nested(&inode->i_mutex, subclass);
183 fill_pre_wcc(fhp);
184 fhp->fh_locked = 1;
185 }
186
187 static inline void
fh_lock(struct svc_fh * fhp)188 fh_lock(struct svc_fh *fhp)
189 {
190 fh_lock_nested(fhp, I_MUTEX_NORMAL);
191 }
192
193 /*
194 * Unlock a file handle/inode
195 */
196 static inline void
fh_unlock(struct svc_fh * fhp)197 fh_unlock(struct svc_fh *fhp)
198 {
199 if (fhp->fh_locked) {
200 fill_post_wcc(fhp);
201 mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
202 fhp->fh_locked = 0;
203 }
204 }
205
206 #endif /* _LINUX_NFSD_FH_INT_H */
207