nsis-do-not-install-sdk-with-client-20040101
[openafs.git] / src / WINNT / afsd / cm_volume.c
1 /*
2  * Copyright 2000, International Business Machines Corporation and others.
3  * All Rights Reserved.
4  * 
5  * This software has been released under the terms of the IBM Public
6  * License.  For details, see the LICENSE file in the top-level source
7  * directory or online at http://www.openafs.org/dl/license10.html
8  */
9
10 #include <afs/param.h>
11 #include <afs/stds.h>
12
13 #ifndef DJGPP
14 #include <windows.h>
15 #include <winsock2.h>
16 #include <nb30.h>
17 #else
18 #include <sys/socket.h>
19 #endif /* !DJGPP */
20 #include <string.h>
21 #include <malloc.h>
22 #include <osi.h>
23 #include <rx/rx.h>
24
25 #include "afsd.h"
26
27 osi_rwlock_t cm_volumeLock;
28 cm_volume_t *cm_allVolumesp;
29
30 void cm_InitVolume(void)
31 {
32         static osi_once_t once;
33         if (osi_Once(&once)) {
34                 lock_InitializeRWLock(&cm_volumeLock, "cm global volume lock");
35                 cm_allVolumesp = NULL;
36                 osi_EndOnce(&once);
37         }
38 }
39
40 /*
41  * Update a volume.  Caller holds volume's lock (volp->mx).
42  */
43 long cm_UpdateVolume(struct cm_cell *cellp, cm_user_t *userp, cm_req_t *reqp,
44         cm_volume_t *volp)
45 {
46         cm_conn_t *connp;
47         int i;
48         cm_serverRef_t *tsrp;
49         cm_server_t *tsp;
50         struct sockaddr_in tsockAddr;
51         long tflags;
52         u_long tempAddr;
53         struct vldbentry vldbEntry;     /* don't use NVLDB yet; they're not common */
54         int ROcount = 0;
55         long code;
56
57         /* clear out old bindings */
58         while (tsrp = volp->rwServersp) {
59                 volp->rwServersp = tsrp->next;
60                 cm_PutServer(tsrp->server);
61                 free(tsrp);
62         }
63         while (tsrp = volp->roServersp) {
64                 volp->roServersp = tsrp->next;
65                 cm_PutServer(tsrp->server);
66                 free(tsrp);
67         }
68         while (tsrp = volp->bkServersp) {
69                 volp->bkServersp = tsrp->next;
70                 cm_PutServer(tsrp->server);
71                 free(tsrp);
72         }
73
74         /* now we have volume structure locked and held; make RPC to fill it */
75         do {
76                 code = cm_ConnByMServers(cellp->vlServersp, userp, reqp,
77                                          &connp);
78                 if (code) continue;
79                 osi_Log1(afsd_logp, "CALL VL_GetEntryByNameO name %s",
80                          volp->namep);
81                 code = VL_GetEntryByNameO(connp->callp, volp->namep, &vldbEntry);
82         } while (cm_Analyze(connp, userp, reqp, NULL, NULL, NULL, code));
83         code = cm_MapVLRPCError(code, reqp);
84
85         if (code == 0) {
86                 /* decode the response */
87                 lock_ObtainWrite(&cm_volumeLock);
88                 if (vldbEntry.flags & VLF_RWEXISTS)
89                         volp->rwID = vldbEntry.volumeId[0];
90                 else
91                         volp->rwID = 0;
92                 if (vldbEntry.flags & VLF_ROEXISTS)
93                         volp->roID = vldbEntry.volumeId[1];
94                 else
95                         volp->roID = 0;
96                 if (vldbEntry.flags & VLF_BACKEXISTS)
97                         volp->bkID = vldbEntry.volumeId[2];
98                 else
99                         volp->bkID = 0;
100                 lock_ReleaseWrite(&cm_volumeLock);
101                 for(i=0; i<vldbEntry.nServers; i++) {
102                         /* create a server entry */
103                         tflags = vldbEntry.serverFlags[i];
104                         if (tflags & VLSF_DONTUSE) continue;
105                         tsockAddr.sin_family = AF_INET;
106                         tempAddr = htonl(vldbEntry.serverNumber[i]);
107                         tsockAddr.sin_addr.s_addr = tempAddr;
108                         tsp = cm_FindServer(&tsockAddr, CM_SERVER_FILE);
109                         if (!tsp)
110                                 tsp = cm_NewServer(&tsockAddr, CM_SERVER_FILE,
111                                                    cellp);
112
113                         /* if this server was created by fs setserverprefs */
114                         if ( !tsp->cellp ) 
115                                 tsp->cellp = cellp;
116
117                         osi_assert(tsp != NULL);
118                         
119                         /* and add it to the list(s). */
120                         /*
121                          * Each call to cm_NewServerRef() increments the
122                          * ref count of tsp.  These reference will be dropped,
123                          * if and when the volume is reset; see reset code
124                          * earlier in this function.
125                          */
126                         if ((tflags & VLSF_RWVOL)
127                             && (vldbEntry.flags & VLF_RWEXISTS)) {
128                                 tsrp = cm_NewServerRef(tsp);
129                                 tsrp->next = volp->rwServersp;
130                                 volp->rwServersp = tsrp;
131                         }
132                         if ((tflags & VLSF_ROVOL)
133                             && (vldbEntry.flags & VLF_ROEXISTS)) {
134                                 tsrp = cm_NewServerRef(tsp);
135                                 cm_InsertServerList(&volp->roServersp, tsrp);
136                                 ROcount++;
137                         }
138                         /* We don't use VLSF_BACKVOL !?! */
139                         if ((tflags & VLSF_RWVOL)
140                             && (vldbEntry.flags & VLF_BACKEXISTS)) {
141                                 tsrp = cm_NewServerRef(tsp);
142                                 tsrp->next = volp->bkServersp;
143                                 volp->bkServersp = tsrp;
144                         }
145                         /* Drop the reference obtained by cm_FindServer() */
146                         cm_PutServer(tsp);
147                 }
148
149                 /*
150                  * Randomize RO list
151                  *
152                  * If the first n servers have the same ipRank, then we 
153                  * randomly pick one among them and move it to the beginning.
154                  * We don't bother to re-order the whole list because
155                  * the rest of the list is used only if the first server is
156                  * down.  We only do this for the RO list; we assume the other
157                  * lists are length 1.
158                  */
159                 if (ROcount > 1) {
160                         cm_RandomizeServer(&volp->roServersp);
161                 }
162         }
163         return code;
164 }
165
166 long cm_GetVolumeByID(cm_cell_t *cellp, long volumeID, cm_user_t *userp,
167         cm_req_t *reqp, cm_volume_t **outVolpp)
168 {
169         cm_volume_t *volp;
170         char volNameString[100];
171         long code;
172
173         lock_ObtainWrite(&cm_volumeLock);
174         for(volp = cm_allVolumesp; volp; volp=volp->nextp) {
175                 if (cellp == volp->cellp &&
176                         ((unsigned) volumeID == volp->rwID ||
177                          (unsigned) volumeID == volp->roID ||
178                          (unsigned) volumeID == volp->bkID))
179                                 break;
180         }
181
182         /* hold the volume if we found it */
183         if (volp) volp->refCount++;
184         lock_ReleaseWrite(&cm_volumeLock);
185         
186         /* return it held */
187         if (volp) {
188                 lock_ObtainMutex(&volp->mx);
189         
190                 if (volp->flags & CM_VOLUMEFLAG_RESET) {
191                         code = cm_UpdateVolume(cellp, userp, reqp, volp);
192                         if (code == 0) {
193                                 volp->flags &= ~CM_VOLUMEFLAG_RESET;
194                         }
195                 }
196                 else
197                         code = 0;
198                 lock_ReleaseMutex(&volp->mx);
199                 if (code == 0)
200                         *outVolpp = volp;
201                 return code;
202         }
203         
204         /* otherwise, we didn't find it so consult the VLDB */
205         sprintf(volNameString, "%u", volumeID);
206         code = cm_GetVolumeByName(cellp, volNameString, userp, reqp,
207                                   0, outVolpp);
208         return code;
209 }
210
211 long cm_GetVolumeByName(struct cm_cell *cellp, char *volumeNamep,
212         struct cm_user *userp, struct cm_req *reqp,
213         long flags, cm_volume_t **outVolpp)
214 {
215         cm_volume_t *volp;
216         long code;
217         
218         /* initialize this */
219         code = 0;
220
221         lock_ObtainWrite(&cm_volumeLock);
222         for(volp = cm_allVolumesp; volp; volp=volp->nextp) {
223                 if (cellp == volp->cellp && strcmp(volumeNamep, volp->namep) == 0) {
224                         break;
225                 }
226         }
227         
228         /* otherwise, get from VLDB */
229         if (!volp) {
230                 volp = malloc(sizeof(*volp));
231                 memset(volp, 0, sizeof(*volp));
232                 volp->cellp = cellp;
233                 volp->nextp = cm_allVolumesp;
234                 cm_allVolumesp = volp;
235                 volp->namep = malloc(strlen(volumeNamep)+1);
236                 strcpy(volp->namep, volumeNamep);
237                 lock_InitializeMutex(&volp->mx, "cm_volume_t mutex");
238                 volp->refCount = 1;     /* starts off held */
239                 volp->flags |= CM_VOLUMEFLAG_RESET;
240         }
241         else {
242                 volp->refCount++;
243         }
244         
245         /* next should work since no one could have gotten ptr to this structure yet */
246         lock_ReleaseWrite(&cm_volumeLock);
247         lock_ObtainMutex(&volp->mx);
248         
249         if (volp->flags & CM_VOLUMEFLAG_RESET) {
250                 code = cm_UpdateVolume(cellp, userp, reqp, volp);
251                 if (code == 0)
252                         volp->flags &= ~CM_VOLUMEFLAG_RESET;
253         }
254
255         if (code == 0)
256                 *outVolpp = volp;
257         lock_ReleaseMutex(&volp->mx);
258         return code;
259 }
260
261 void cm_ForceUpdateVolume(cm_fid_t *fidp, cm_user_t *userp, cm_req_t *reqp)
262 {
263         cm_cell_t *cellp;
264         cm_volume_t *volp;
265         long code;
266
267         cellp = cm_FindCellByID(fidp->cell);
268         if (!cellp) return;
269
270         /* search for the volume */
271         lock_ObtainWrite(&cm_volumeLock);
272         for(volp = cm_allVolumesp; volp; volp=volp->nextp) {
273                 if (cellp == volp->cellp &&
274                         (fidp->volume == volp->rwID ||
275                          fidp->volume == volp->roID ||
276                          fidp->volume == volp->bkID))
277                                 break;
278         }
279
280         /* hold the volume if we found it */
281         if (volp) volp->refCount++;
282         lock_ReleaseWrite(&cm_volumeLock);
283
284         /* update it */
285         cm_mountRootGen++;
286         lock_ObtainMutex(&volp->mx);
287         volp->flags |= CM_VOLUMEFLAG_RESET;
288         code = cm_UpdateVolume(cellp, userp, reqp, volp);
289         if (code == 0)
290                 volp->flags &= ~CM_VOLUMEFLAG_RESET;
291         lock_ReleaseMutex(&volp->mx);
292
293         cm_PutVolume(volp);
294 }
295
296 /* find the appropriate servers from a volume */
297 cm_serverRef_t *cm_GetVolServers(cm_volume_t *volp, unsigned long volume)
298 {
299         cm_serverRef_t *serversp;
300
301         if (volume == volp->rwID)
302                 serversp = volp->rwServersp;
303         else if (volume == volp->roID)
304                 serversp = volp->roServersp;
305         else if (volume == volp->bkID)
306                 serversp = volp->bkServersp;
307         else osi_panic("bad volume ID in cm_GetVolServers", __FILE__, __LINE__);
308         
309         return serversp;
310 }
311
312 void cm_PutVolume(cm_volume_t *volp)
313 {
314         lock_ObtainWrite(&cm_volumeLock);
315         osi_assert(volp->refCount-- > 0);
316         lock_ReleaseWrite(&cm_volumeLock);
317 }
318
319 /* return the read-only volume, if there is one, or the read-write volume if
320  * not.
321  */
322 long cm_GetROVolumeID(cm_volume_t *volp)
323 {
324         long id;
325
326         lock_ObtainMutex(&volp->mx);
327         if (volp->roID && volp->roServersp)
328                 id = volp->roID;
329         else
330                 id = volp->rwID;
331         lock_ReleaseMutex(&volp->mx);
332
333         return id;
334 }
335
336 void cm_CheckVolumes(void)
337 {
338         cm_volume_t *volp;
339
340         cm_mountRootGen++;
341         lock_ObtainWrite(&cm_volumeLock);
342         for(volp = cm_allVolumesp; volp; volp=volp->nextp) {
343                 volp->refCount++;
344                 lock_ReleaseWrite(&cm_volumeLock);
345                 lock_ObtainMutex(&volp->mx);
346
347                 volp->flags |= CM_VOLUMEFLAG_RESET;
348
349                 lock_ReleaseMutex(&volp->mx);
350                 lock_ObtainWrite(&cm_volumeLock);
351                 osi_assert(volp->refCount-- > 0);
352         }
353         lock_ReleaseWrite(&cm_volumeLock);
354
355         /* We should also refresh cached mount points */
356
357 }
358
359 /*
360 ** Finds all volumes that reside on this server and reorders their
361 ** RO list according to the changed rank of server.
362 */
363 void cm_ChangeRankVolume(cm_server_t       *tsp)
364 {
365         int             code;
366         cm_volume_t*    volp;
367
368         /* find volumes which might have RO copy on server*/
369         lock_ObtainWrite(&cm_volumeLock);
370         for(volp = cm_allVolumesp; volp; volp=volp->nextp)
371         {
372                 code = 1 ;      /* assume that list is unchanged */
373                 volp->refCount++;
374                 lock_ReleaseWrite(&cm_volumeLock);
375                 lock_ObtainMutex(&volp->mx);
376
377                 if ((tsp->cellp==volp->cellp) && (volp->roServersp))
378                     code =cm_ChangeRankServer(&volp->roServersp, tsp);
379
380                 /* this volume list was changed */
381                 if ( !code )
382                         cm_RandomizeServer(&volp->roServersp);
383
384                 lock_ReleaseMutex(&volp->mx);
385                 lock_ObtainWrite(&cm_volumeLock);
386                 osi_assert(volp->refCount-- > 0);
387         }
388         lock_ReleaseWrite(&cm_volumeLock);
389 }