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8#ifndef _LINUX_NFSD_NFSFH_H
9#define _LINUX_NFSD_NFSFH_H
10
11#include <linux/crc32.h>
12#include <linux/sunrpc/svc.h>
13#include <uapi/linux/nfsd/nfsfh.h>
14#include <linux/iversion.h>
15
16static inline __u32 ino_t_to_u32(ino_t ino)
17{
18 return (__u32) ino;
19}
20
21static inline ino_t u32_to_ino_t(__u32 uino)
22{
23 return (ino_t) uino;
24}
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29
30typedef struct svc_fh {
31 struct knfsd_fh fh_handle;
32 int fh_maxsize;
33 struct dentry * fh_dentry;
34 struct svc_export * fh_export;
35
36 bool fh_locked;
37 bool fh_want_write;
38
39#ifdef CONFIG_NFSD_V3
40 bool fh_post_saved;
41 bool fh_pre_saved;
42
43
44 __u64 fh_pre_size;
45 struct timespec64 fh_pre_mtime;
46 struct timespec64 fh_pre_ctime;
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50
51 u64 fh_pre_change;
52
53
54 struct kstat fh_post_attr;
55 u64 fh_post_change;
56#endif
57
58} svc_fh;
59
60enum nfsd_fsid {
61 FSID_DEV = 0,
62 FSID_NUM,
63 FSID_MAJOR_MINOR,
64 FSID_ENCODE_DEV,
65 FSID_UUID4_INUM,
66 FSID_UUID8,
67 FSID_UUID16,
68 FSID_UUID16_INUM,
69};
70
71enum fsid_source {
72 FSIDSOURCE_DEV,
73 FSIDSOURCE_FSID,
74 FSIDSOURCE_UUID,
75};
76extern enum fsid_source fsid_source(struct svc_fh *fhp);
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88
89static inline void mk_fsid(int vers, u32 *fsidv, dev_t dev, ino_t ino,
90 u32 fsid, unsigned char *uuid)
91{
92 u32 *up;
93 switch(vers) {
94 case FSID_DEV:
95 fsidv[0] = (__force __u32)htonl((MAJOR(dev)<<16) |
96 MINOR(dev));
97 fsidv[1] = ino_t_to_u32(ino);
98 break;
99 case FSID_NUM:
100 fsidv[0] = fsid;
101 break;
102 case FSID_MAJOR_MINOR:
103 fsidv[0] = (__force __u32)htonl(MAJOR(dev));
104 fsidv[1] = (__force __u32)htonl(MINOR(dev));
105 fsidv[2] = ino_t_to_u32(ino);
106 break;
107
108 case FSID_ENCODE_DEV:
109 fsidv[0] = new_encode_dev(dev);
110 fsidv[1] = ino_t_to_u32(ino);
111 break;
112
113 case FSID_UUID4_INUM:
114
115 up = (u32*)uuid;
116 fsidv[0] = ino_t_to_u32(ino);
117 fsidv[1] = up[0] ^ up[1] ^ up[2] ^ up[3];
118 break;
119
120 case FSID_UUID8:
121
122 up = (u32*)uuid;
123 fsidv[0] = up[0] ^ up[2];
124 fsidv[1] = up[1] ^ up[3];
125 break;
126
127 case FSID_UUID16:
128
129 memcpy(fsidv, uuid, 16);
130 break;
131
132 case FSID_UUID16_INUM:
133
134 *(u64*)fsidv = (u64)ino;
135 memcpy(fsidv+2, uuid, 16);
136 break;
137 default: BUG();
138 }
139}
140
141static inline int key_len(int type)
142{
143 switch(type) {
144 case FSID_DEV: return 8;
145 case FSID_NUM: return 4;
146 case FSID_MAJOR_MINOR: return 12;
147 case FSID_ENCODE_DEV: return 8;
148 case FSID_UUID4_INUM: return 8;
149 case FSID_UUID8: return 8;
150 case FSID_UUID16: return 16;
151 case FSID_UUID16_INUM: return 24;
152 default: return 0;
153 }
154}
155
156
157
158
159extern char * SVCFH_fmt(struct svc_fh *fhp);
160
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163
164__be32 fh_verify(struct svc_rqst *, struct svc_fh *, umode_t, int);
165__be32 fh_compose(struct svc_fh *, struct svc_export *, struct dentry *, struct svc_fh *);
166__be32 fh_update(struct svc_fh *);
167void fh_put(struct svc_fh *);
168
169static __inline__ struct svc_fh *
170fh_copy(struct svc_fh *dst, struct svc_fh *src)
171{
172 WARN_ON(src->fh_dentry || src->fh_locked);
173
174 *dst = *src;
175 return dst;
176}
177
178static inline void
179fh_copy_shallow(struct knfsd_fh *dst, struct knfsd_fh *src)
180{
181 dst->fh_size = src->fh_size;
182 memcpy(&dst->fh_base, &src->fh_base, src->fh_size);
183}
184
185static __inline__ struct svc_fh *
186fh_init(struct svc_fh *fhp, int maxsize)
187{
188 memset(fhp, 0, sizeof(*fhp));
189 fhp->fh_maxsize = maxsize;
190 return fhp;
191}
192
193static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
194{
195 if (fh1->fh_size != fh2->fh_size)
196 return false;
197 if (memcmp(fh1->fh_base.fh_pad, fh2->fh_base.fh_pad, fh1->fh_size) != 0)
198 return false;
199 return true;
200}
201
202static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
203{
204 if (fh1->fh_fsid_type != fh2->fh_fsid_type)
205 return false;
206 if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type)) != 0)
207 return false;
208 return true;
209}
210
211#ifdef CONFIG_CRC32
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220static inline u32
221knfsd_fh_hash(struct knfsd_fh *fh)
222{
223 return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
224}
225#else
226static inline u32
227knfsd_fh_hash(struct knfsd_fh *fh)
228{
229 return 0;
230}
231#endif
232
233#ifdef CONFIG_NFSD_V3
234
235
236
237
238static inline void
239fh_clear_wcc(struct svc_fh *fhp)
240{
241 fhp->fh_post_saved = false;
242 fhp->fh_pre_saved = false;
243}
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255
256static inline u64 nfsd4_change_attribute(struct kstat *stat,
257 struct inode *inode)
258{
259 u64 chattr;
260
261 chattr = stat->ctime.tv_sec;
262 chattr <<= 30;
263 chattr += stat->ctime.tv_nsec;
264 chattr += inode_query_iversion(inode);
265 return chattr;
266}
267
268extern void fill_pre_wcc(struct svc_fh *fhp);
269extern void fill_post_wcc(struct svc_fh *fhp);
270#else
271#define fh_clear_wcc(ignored)
272#define fill_pre_wcc(ignored)
273#define fill_post_wcc(notused)
274#endif
275
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283
284static inline void
285fh_lock_nested(struct svc_fh *fhp, unsigned int subclass)
286{
287 struct dentry *dentry = fhp->fh_dentry;
288 struct inode *inode;
289
290 BUG_ON(!dentry);
291
292 if (fhp->fh_locked) {
293 printk(KERN_WARNING "fh_lock: %pd2 already locked!\n",
294 dentry);
295 return;
296 }
297
298 inode = d_inode(dentry);
299 inode_lock_nested(inode, subclass);
300 fill_pre_wcc(fhp);
301 fhp->fh_locked = true;
302}
303
304static inline void
305fh_lock(struct svc_fh *fhp)
306{
307 fh_lock_nested(fhp, I_MUTEX_NORMAL);
308}
309
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312
313static inline void
314fh_unlock(struct svc_fh *fhp)
315{
316 if (fhp->fh_locked) {
317 fill_post_wcc(fhp);
318 inode_unlock(d_inode(fhp->fh_dentry));
319 fhp->fh_locked = false;
320 }
321}
322
323#endif
324