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Linux/fs/lockd/xdr4.c

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  1 /*
  2  * linux/fs/lockd/xdr4.c
  3  *
  4  * XDR support for lockd and the lock client.
  5  *
  6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  7  * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
  8  */
  9 
 10 #include <linux/types.h>
 11 #include <linux/sched.h>
 12 #include <linux/nfs.h>
 13 
 14 #include <linux/sunrpc/xdr.h>
 15 #include <linux/sunrpc/clnt.h>
 16 #include <linux/sunrpc/svc.h>
 17 #include <linux/sunrpc/stats.h>
 18 #include <linux/lockd/lockd.h>
 19 
 20 #define NLMDBG_FACILITY         NLMDBG_XDR
 21 
 22 static inline loff_t
 23 s64_to_loff_t(__s64 offset)
 24 {
 25         return (loff_t)offset;
 26 }
 27 
 28 
 29 static inline s64
 30 loff_t_to_s64(loff_t offset)
 31 {
 32         s64 res;
 33         if (offset > NLM4_OFFSET_MAX)
 34                 res = NLM4_OFFSET_MAX;
 35         else if (offset < -NLM4_OFFSET_MAX)
 36                 res = -NLM4_OFFSET_MAX;
 37         else
 38                 res = offset;
 39         return res;
 40 }
 41 
 42 /*
 43  * XDR functions for basic NLM types
 44  */
 45 static __be32 *
 46 nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
 47 {
 48         unsigned int    len;
 49 
 50         len = ntohl(*p++);
 51         
 52         if(len==0)
 53         {
 54                 c->len=4;
 55                 memset(c->data, 0, 4);  /* hockeypux brain damage */
 56         }
 57         else if(len<=NLM_MAXCOOKIELEN)
 58         {
 59                 c->len=len;
 60                 memcpy(c->data, p, len);
 61                 p+=XDR_QUADLEN(len);
 62         }
 63         else 
 64         {
 65                 dprintk("lockd: bad cookie size %d (only cookies under "
 66                         "%d bytes are supported.)\n",
 67                                 len, NLM_MAXCOOKIELEN);
 68                 return NULL;
 69         }
 70         return p;
 71 }
 72 
 73 static __be32 *
 74 nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
 75 {
 76         *p++ = htonl(c->len);
 77         memcpy(p, c->data, c->len);
 78         p+=XDR_QUADLEN(c->len);
 79         return p;
 80 }
 81 
 82 static __be32 *
 83 nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
 84 {
 85         memset(f->data, 0, sizeof(f->data));
 86         f->size = ntohl(*p++);
 87         if (f->size > NFS_MAXFHSIZE) {
 88                 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
 89                         f->size, NFS_MAXFHSIZE);
 90                 return NULL;
 91         }
 92         memcpy(f->data, p, f->size);
 93         return p + XDR_QUADLEN(f->size);
 94 }
 95 
 96 /*
 97  * Encode and decode owner handle
 98  */
 99 static __be32 *
100 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
101 {
102         return xdr_decode_netobj(p, oh);
103 }
104 
105 static __be32 *
106 nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
107 {
108         struct file_lock        *fl = &lock->fl;
109         __u64                   len, start;
110         __s64                   end;
111 
112         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
113                                             &lock->len, NLM_MAXSTRLEN))
114          || !(p = nlm4_decode_fh(p, &lock->fh))
115          || !(p = nlm4_decode_oh(p, &lock->oh)))
116                 return NULL;
117         lock->svid  = ntohl(*p++);
118 
119         locks_init_lock(fl);
120         fl->fl_owner = current->files;
121         fl->fl_pid   = (pid_t)lock->svid;
122         fl->fl_flags = FL_POSIX;
123         fl->fl_type  = F_RDLCK;         /* as good as anything else */
124         p = xdr_decode_hyper(p, &start);
125         p = xdr_decode_hyper(p, &len);
126         end = start + len - 1;
127 
128         fl->fl_start = s64_to_loff_t(start);
129 
130         if (len == 0 || end < 0)
131                 fl->fl_end = OFFSET_MAX;
132         else
133                 fl->fl_end = s64_to_loff_t(end);
134         return p;
135 }
136 
137 /*
138  * Encode result of a TEST/TEST_MSG call
139  */
140 static __be32 *
141 nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
142 {
143         s64             start, len;
144 
145         dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
146         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
147                 return NULL;
148         *p++ = resp->status;
149 
150         if (resp->status == nlm_lck_denied) {
151                 struct file_lock        *fl = &resp->lock.fl;
152 
153                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
154                 *p++ = htonl(resp->lock.svid);
155 
156                 /* Encode owner handle. */
157                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
158                         return NULL;
159 
160                 start = loff_t_to_s64(fl->fl_start);
161                 if (fl->fl_end == OFFSET_MAX)
162                         len = 0;
163                 else
164                         len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
165                 
166                 p = xdr_encode_hyper(p, start);
167                 p = xdr_encode_hyper(p, len);
168                 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
169                         resp->status, (int)resp->lock.svid, fl->fl_type,
170                         (long long)fl->fl_start,  (long long)fl->fl_end);
171         }
172 
173         dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
174         return p;
175 }
176 
177 
178 /*
179  * First, the server side XDR functions
180  */
181 int
182 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
183 {
184         u32     exclusive;
185 
186         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
187                 return 0;
188 
189         exclusive = ntohl(*p++);
190         if (!(p = nlm4_decode_lock(p, &argp->lock)))
191                 return 0;
192         if (exclusive)
193                 argp->lock.fl.fl_type = F_WRLCK;
194 
195         return xdr_argsize_check(rqstp, p);
196 }
197 
198 int
199 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
200 {
201         if (!(p = nlm4_encode_testres(p, resp)))
202                 return 0;
203         return xdr_ressize_check(rqstp, p);
204 }
205 
206 int
207 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
208 {
209         u32     exclusive;
210 
211         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
212                 return 0;
213         argp->block  = ntohl(*p++);
214         exclusive    = ntohl(*p++);
215         if (!(p = nlm4_decode_lock(p, &argp->lock)))
216                 return 0;
217         if (exclusive)
218                 argp->lock.fl.fl_type = F_WRLCK;
219         argp->reclaim = ntohl(*p++);
220         argp->state   = ntohl(*p++);
221         argp->monitor = 1;              /* monitor client by default */
222 
223         return xdr_argsize_check(rqstp, p);
224 }
225 
226 int
227 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
228 {
229         u32     exclusive;
230 
231         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
232                 return 0;
233         argp->block = ntohl(*p++);
234         exclusive = ntohl(*p++);
235         if (!(p = nlm4_decode_lock(p, &argp->lock)))
236                 return 0;
237         if (exclusive)
238                 argp->lock.fl.fl_type = F_WRLCK;
239         return xdr_argsize_check(rqstp, p);
240 }
241 
242 int
243 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
244 {
245         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
246          || !(p = nlm4_decode_lock(p, &argp->lock)))
247                 return 0;
248         argp->lock.fl.fl_type = F_UNLCK;
249         return xdr_argsize_check(rqstp, p);
250 }
251 
252 int
253 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
254 {
255         struct nlm_lock *lock = &argp->lock;
256 
257         memset(lock, 0, sizeof(*lock));
258         locks_init_lock(&lock->fl);
259         lock->svid = ~(u32) 0;
260         lock->fl.fl_pid = (pid_t)lock->svid;
261 
262         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
263          || !(p = xdr_decode_string_inplace(p, &lock->caller,
264                                             &lock->len, NLM_MAXSTRLEN))
265          || !(p = nlm4_decode_fh(p, &lock->fh))
266          || !(p = nlm4_decode_oh(p, &lock->oh)))
267                 return 0;
268         argp->fsm_mode = ntohl(*p++);
269         argp->fsm_access = ntohl(*p++);
270         return xdr_argsize_check(rqstp, p);
271 }
272 
273 int
274 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
275 {
276         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
277                 return 0;
278         *p++ = resp->status;
279         *p++ = xdr_zero;                /* sequence argument */
280         return xdr_ressize_check(rqstp, p);
281 }
282 
283 int
284 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
285 {
286         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
287                 return 0;
288         *p++ = resp->status;
289         return xdr_ressize_check(rqstp, p);
290 }
291 
292 int
293 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
294 {
295         struct nlm_lock *lock = &argp->lock;
296 
297         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
298                                             &lock->len, NLM_MAXSTRLEN)))
299                 return 0;
300         argp->state = ntohl(*p++);
301         return xdr_argsize_check(rqstp, p);
302 }
303 
304 int
305 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
306 {
307         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
308                 return 0;
309         argp->state = ntohl(*p++);
310         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
311         p += XDR_QUADLEN(SM_PRIV_SIZE);
312         return xdr_argsize_check(rqstp, p);
313 }
314 
315 int
316 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
317 {
318         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
319                 return 0;
320         resp->status = *p++;
321         return xdr_argsize_check(rqstp, p);
322 }
323 
324 int
325 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
326 {
327         return xdr_argsize_check(rqstp, p);
328 }
329 
330 int
331 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
332 {
333         return xdr_ressize_check(rqstp, p);
334 }
335 

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