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7#ifndef _LINUX_NFSD_NFSFH_H
8#define _LINUX_NFSD_NFSFH_H
9
10#include <linux/crc32.h>
11#include <linux/sunrpc/svc.h>
12#include <uapi/linux/nfsd/nfsfh.h>
13
14static inline __u32 ino_t_to_u32(ino_t ino)
15{
16 return (__u32) ino;
17}
18
19static inline ino_t u32_to_ino_t(__u32 uino)
20{
21 return (ino_t) uino;
22}
23
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27
28typedef struct svc_fh {
29 struct knfsd_fh fh_handle;
30 int fh_maxsize;
31 struct dentry * fh_dentry;
32 struct svc_export * fh_export;
33
34 bool fh_locked;
35 bool fh_want_write;
36
37#ifdef CONFIG_NFSD_V3
38 bool fh_post_saved;
39 bool fh_pre_saved;
40
41
42 __u64 fh_pre_size;
43 struct timespec fh_pre_mtime;
44 struct timespec fh_pre_ctime;
45
46
47
48
49 u64 fh_pre_change;
50
51
52 struct kstat fh_post_attr;
53 u64 fh_post_change;
54#endif
55
56} svc_fh;
57
58enum nfsd_fsid {
59 FSID_DEV = 0,
60 FSID_NUM,
61 FSID_MAJOR_MINOR,
62 FSID_ENCODE_DEV,
63 FSID_UUID4_INUM,
64 FSID_UUID8,
65 FSID_UUID16,
66 FSID_UUID16_INUM,
67};
68
69enum fsid_source {
70 FSIDSOURCE_DEV,
71 FSIDSOURCE_FSID,
72 FSIDSOURCE_UUID,
73};
74extern enum fsid_source fsid_source(struct svc_fh *fhp);
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86
87static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
88 u32 fsid, unsigned char *uuid)
89{
90 u32 *up;
91 switch(vers) {
92 case FSID_DEV:
93 fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) |
94 MINOR(dev));
95 fsidv[1] = ino_t_to_u32(ino);
96 break;
97 case FSID_NUM:
98 fsidv[0] = fsid;
99 break;
100 case FSID_MAJOR_MINOR:
101 fsidv[0] = (__force __u32)htonl(MAJOR(dev));
102 fsidv[1] = (__force __u32)htonl(MINOR(dev));
103 fsidv[2] = ino_t_to_u32(ino);
104 break;
105
106 case FSID_ENCODE_DEV:
107 fsidv[0] = new_encode_dev(dev);
108 fsidv[1] = ino_t_to_u32(ino);
109 break;
110
111 case FSID_UUID4_INUM:
112
113 up = (u32*)uuid;
114 fsidv[0] = ino_t_to_u32(ino);
115 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
116 break;
117
118 case FSID_UUID8:
119
120 up = (u32*)uuid;
121 fsidv[0] = up[0] ^ up[2];
122 fsidv[1] = up[1] ^ up[3];
123 break;
124
125 case FSID_UUID16:
126
127 memcpy(fsidv, uuid, 16);
128 break;
129
130 case FSID_UUID16_INUM:
131
132 *(u64*)fsidv = (u64)ino;
133 memcpy(fsidv+2, uuid, 16);
134 break;
135 default: BUG();
136 }
137}
138
139static inline int key_len(int type)
140{
141 switch(type) {
142 case FSID_DEV: return 8;
143 case FSID_NUM: return 4;
144 case FSID_MAJOR_MINOR: return 12;
145 case FSID_ENCODE_DEV: return 8;
146 case FSID_UUID4_INUM: return 8;
147 case FSID_UUID8: return 8;
148 case FSID_UUID16: return 16;
149 case FSID_UUID16_INUM: return 24;
150 default: return 0;
151 }
152}
153
154
155
156
157extern char * SVCFH_fmt(struct svc_fh *fhp);
158
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161
162__be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int);
163__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
164__be32 fh_update(struct svc_fh *);
165void fh_put(struct svc_fh *);
166
167static __inline__ struct svc_fh *
168fh_copy(struct svc_fh *dst, struct svc_fh *src)
169{
170 WARN_ON(src->fh_dentry || src->fh_locked);
171
172 *dst = *src;
173 return dst;
174}
175
176static inline void
177fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
178{
179 dst->fh_size = src->fh_size;
180 memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
181}
182
183static __inline__ struct svc_fh *
184fh_init(struct svc_fh *fhp, int maxsize)
185{
186 memset(fhp, 0, sizeof(*fhp));
187 fhp->fh_maxsize = maxsize;
188 return fhp;
189}
190
191static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
192{
193 if (fh1->fh_size != fh2->fh_size)
194 return false;
195 if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0)
196 return false;
197 return true;
198}
199
200static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
201{
202 if (fh1->fh_fsid_type != fh2->fh_fsid_type)
203 return false;
204 if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0)
205 return false;
206 return true;
207}
208
209#ifdef CONFIG_CRC32
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217
218static inline u32
219knfsd_fh_hash(struct knfsd_fh *fh)
220{
221 return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
222}
223#else
224static inline u32
225knfsd_fh_hash(struct knfsd_fh *fh)
226{
227 return 0;
228}
229#endif
230
231#ifdef CONFIG_NFSD_V3
232
233
234
235
236static inline void
237fh_clear_wcc(struct svc_fh *fhp)
238{
239 fhp->fh_post_saved = false;
240 fhp->fh_pre_saved = false;
241}
242
243
244
245
246static inline void
247fill_pre_wcc(struct svc_fh *fhp)
248{
249 struct inode *inode;
250
251 inode = d_inode(fhp->fh_dentry);
252 if (!fhp->fh_pre_saved) {
253 fhp->fh_pre_mtime = inode->i_mtime;
254 fhp->fh_pre_ctime = inode->i_ctime;
255 fhp->fh_pre_size = inode->i_size;
256 fhp->fh_pre_change = inode->i_version;
257 fhp->fh_pre_saved = true;
258 }
259}
260
261extern void fill_post_wcc(struct svc_fh *);
262#else
263#define fh_clear_wcc(ignored)
264#define fill_pre_wcc(ignored)
265#define fill_post_wcc(notused)
266#endif
267
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275
276static inline void
277fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
278{
279 struct dentry *dentry = fhp->fh_dentry;
280 struct inode *inode;
281
282 BUG_ON(!dentry);
283
284 if (fhp->fh_locked) {
285 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
286 dentry);
287 return;
288 }
289
290 inode = d_inode(dentry);
291 inode_lock_nested(inode, subclass);
292 fill_pre_wcc(fhp);
293 fhp->fh_locked = true;
294}
295
296static inline void
297fh_lock(struct svc_fh *fhp)
298{
299 fh_lock_nested(fhp, I_MUTEX_NORMAL);
300}
301
302
303
304
305static inline void
306fh_unlock(struct svc_fh *fhp)
307{
308 if (fhp->fh_locked) {
309 fill_post_wcc(fhp);
310 inode_unlock(d_inode(fhp->fh_dentry));
311 fhp->fh_locked = false;
312 }
313}
314
315#endif
316