2 * Copyright 2000, International Business Machines Corporation and others.
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
13 #include <afsconfig.h>
14 #include "afs/param.h"
18 #include "afs/sysincludes.h" /* Standard vendor system headers */
19 #include "afsincludes.h" /* Afs-based standard headers */
20 #include "afs/afs_stats.h" /* afs statistics */
21 #include "afs/afs_osi.h"
22 #include "hcrypto/md5.h"
24 /* Local variables. */
25 afs_rwlock_t afs_xcell; /* Export for cmdebug peeking at locks */
28 * AFSDB implementation:
30 * afs_StopAFSDB: terminate the AFSDB handler, used on shutdown
31 * afs_AFSDBHandler: entry point for user-space AFSDB request handler
32 * afs_GetCellHostsAFSDB: query the AFSDB handler and wait for response
33 * afs_LookupAFSDB: look up AFSDB for given cell name and create locally
36 afs_rwlock_t afsdb_client_lock; /* Serializes client requests */
37 afs_rwlock_t afsdb_req_lock; /* Serializes client requests */
38 static char afsdb_handler_running; /* Protected by GLOCK */
39 static char afsdb_handler_shutdown; /* Protected by GLOCK */
41 /* from cellconfig.h */
42 #define MAXCELLCHARS 64
44 /* lock moved to afsdb_req_lock for cmdebug */
51 * Terminate the AFSDB handler, used on shutdown.
56 if (afsdb_handler_running) {
57 afs_osi_Wakeup(&afsdb_req);
59 afsdb_handler_shutdown = 1;
60 #if defined(AFS_SUN5_ENV) || defined(RXK_LISTENER_ENV) || defined(RXK_UPCALL_ENV)
61 afs_termState = AFSOP_STOP_RXEVENT;
63 afs_termState = AFSOP_STOP_COMPLETE;
65 afs_osi_Wakeup(&afs_termState);
70 * \brief Entry point for user-space AFSDB request handler.
71 * Reads cell data from kerlenMsg and add new cell, or alias.
72 * \param acellName Cell name. If a cell is found, it's name will be filled in here.
73 * \param acellNameLen Cell name length.
74 * \param kernelMsg Buffer containing data about host count, time out, and cell hosts ids.
75 * \return 0 for success, < 0 for error.
78 afs_AFSDBHandler(char *acellName, int acellNameLen, afs_int32 * kernelMsg)
80 afs_int32 timeout, code;
81 afs_int32 cellHosts[AFS_MAXCELLHOSTS];
83 if (afsdb_handler_shutdown)
85 afsdb_handler_running = 1;
87 ObtainSharedLock(&afsdb_req_lock, 683);
88 if (afsdb_req.pending) {
91 UpgradeSToWLock(&afsdb_req_lock, 684);
92 hostCount = kernelMsg[0];
93 timeout = kernelMsg[1];
95 timeout += osi_Time();
97 for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
101 cellHosts[i] = kernelMsg[2 + i];
105 code = afs_NewCell(acellName, cellHosts, CNoSUID, NULL, 0, 0,
108 if (!hostCount || (code && code != EEXIST))
109 /* null out the cellname if the lookup failed */
110 afsdb_req.cellname = NULL;
112 /* If we found an alias, create it */
113 if (afs_strcasecmp(afsdb_req.cellname, acellName))
114 afs_NewCellAlias(afsdb_req.cellname, acellName);
116 /* Request completed, wake up the relevant thread */
117 afsdb_req.pending = 0;
118 afsdb_req.complete = 1;
119 afs_osi_Wakeup(&afsdb_req);
120 ConvertWToSLock(&afsdb_req_lock);
122 ConvertSToRLock(&afsdb_req_lock);
124 /* Wait for a request */
125 while (afsdb_req.pending == 0 && afs_termState != AFSOP_STOP_AFSDB) {
126 ReleaseReadLock(&afsdb_req_lock);
127 afs_osi_Sleep(&afsdb_req);
128 ObtainReadLock(&afsdb_req_lock);
131 /* Check if we're shutting down */
132 if (afs_termState == AFSOP_STOP_AFSDB) {
133 ReleaseReadLock(&afsdb_req_lock);
135 /* Inform anyone waiting for us that we're going away */
136 afsdb_handler_shutdown = 1;
137 afsdb_handler_running = 0;
138 afs_osi_Wakeup(&afsdb_req);
140 afs_termState = AFSOP_STOP_RXEVENT;
141 afs_osi_Wakeup(&afs_termState);
145 /* Return the lookup request to userspace */
146 strncpy(acellName, afsdb_req.cellname, acellNameLen);
147 ReleaseReadLock(&afsdb_req_lock);
152 * \brief Query the AFSDB handler and wait for response.
154 * \return 0 for success. < 0 is error.
157 afs_GetCellHostsAFSDB(char *acellName)
160 if (!afsdb_handler_running)
163 ObtainWriteLock(&afsdb_client_lock, 685);
164 ObtainWriteLock(&afsdb_req_lock, 686);
166 afsdb_req.cellname = acellName;
168 afsdb_req.complete = 0;
169 afsdb_req.pending = 1;
170 afs_osi_Wakeup(&afsdb_req);
171 ConvertWToRLock(&afsdb_req_lock);
173 while (afsdb_handler_running && !afsdb_req.complete) {
174 ReleaseReadLock(&afsdb_req_lock);
175 afs_osi_Sleep(&afsdb_req);
176 ObtainReadLock(&afsdb_req_lock);
179 ReleaseReadLock(&afsdb_req_lock);
180 ReleaseWriteLock(&afsdb_client_lock);
182 if (afsdb_req.cellname) {
190 * Look up AFSDB for given cell name and create locally.
191 * \param acellName Cell name.
194 afs_LookupAFSDB(char *acellName)
197 char *cellName = afs_strdup(acellName);
199 code = afs_GetCellHostsAFSDB(cellName);
200 afs_Trace2(afs_iclSetp, CM_TRACE_AFSDB, ICL_TYPE_STRING, cellName,
201 ICL_TYPE_INT32, code);
202 afs_osi_FreeStr(cellName);
206 * Cell name-to-ID mapping
208 * afs_cellname_new: create a new cell name, optional cell number
209 * afs_cellname_lookup_id: look up a cell name
210 * afs_cellname_lookup_name: look up a cell number
211 * afs_cellname_ref: note that this cell name was referenced somewhere
212 * afs_cellname_init: load the list of cells from given inode
213 * afs_cellname_write: write in-kernel list of cells to disk
216 struct cell_name *afs_cellname_head; /* Export for kdump */
217 static afs_dcache_id_t afs_cellname_inode;
218 static int afs_cellname_inode_set;
219 static int afs_cellname_dirty;
220 static afs_int32 afs_cellnum_next;
223 * Create a new cell name, optional cell number.
224 * \param name Name of cell.
225 * \param cellnum Cellname number.
226 * \return Initialized structure.
228 static struct cell_name *
229 afs_cellname_new(char *name, afs_int32 cellnum)
231 struct cell_name *cn;
234 cellnum = afs_cellnum_next;
236 cn = afs_osi_Alloc(sizeof(*cn));
237 osi_Assert(cn != NULL);
238 cn->next = afs_cellname_head;
239 cn->cellnum = cellnum;
240 cn->cellname = afs_strdup(name);
242 afs_cellname_head = cn;
244 if (cellnum >= afs_cellnum_next)
245 afs_cellnum_next = cellnum + 1;
251 * Look up a cell name by id.
255 static struct cell_name *
256 afs_cellname_lookup_id(afs_int32 cellnum)
258 struct cell_name *cn;
260 for (cn = afs_cellname_head; cn; cn = cn->next)
261 if (cn->cellnum == cellnum)
268 * Look up a cell name.
269 * \param name Cell name.
272 static struct cell_name *
273 afs_cellname_lookup_name(char *name)
275 struct cell_name *cn;
277 for (cn = afs_cellname_head; cn; cn = cn->next)
278 if (strcmp(cn->cellname, name) == 0)
285 * Note that this cell name was referenced somewhere.
289 afs_cellname_ref(struct cell_name *cn)
293 afs_cellname_dirty = 1;
298 * \brief Load the list of cells from given inode.
299 * \param inode Source inode.
301 * \return 0 for success. < 0 for error.
304 afs_cellname_init(afs_dcache_id_t *inode, int lookupcode)
306 struct osi_file *tfile;
309 ObtainWriteLock(&afs_xcell, 692);
311 afs_cellnum_next = 1;
312 afs_cellname_dirty = 0;
314 if (cacheDiskType == AFS_FCACHE_TYPE_MEM) {
315 ReleaseWriteLock(&afs_xcell);
319 ReleaseWriteLock(&afs_xcell);
323 tfile = osi_UFSOpen(inode);
325 ReleaseWriteLock(&afs_xcell);
329 afs_copy_inode(&afs_cellname_inode, inode);
330 afs_cellname_inode_set = 1;
333 afs_int32 cellnum, clen, magic;
336 cc = afs_osi_Read(tfile, off, &magic, sizeof(magic));
337 if (cc != sizeof(magic))
339 if (magic != AFS_CELLINFO_MAGIC)
343 cc = afs_osi_Read(tfile, off, &cellnum, sizeof(cellnum));
344 if (cc != sizeof(cellnum))
348 cc = afs_osi_Read(tfile, off, &clen, sizeof(clen));
349 if (cc != sizeof(clen))
353 cellname = afs_osi_Alloc(clen + 1);
357 cc = afs_osi_Read(tfile, off, cellname, clen);
359 afs_osi_Free(cellname, clen + 1);
363 cellname[clen] = '\0';
365 if (afs_cellname_lookup_name(cellname)
366 || afs_cellname_lookup_id(cellnum)) {
367 afs_osi_Free(cellname, clen + 1);
371 afs_cellname_new(cellname, cellnum);
372 afs_osi_Free(cellname, clen + 1);
376 ReleaseWriteLock(&afs_xcell);
381 * Write in-kernel list of cells to disk.
384 afs_cellname_write(void)
386 struct osi_file *tfile;
387 struct cell_name *cn;
390 if (!afs_cellname_dirty || !afs_cellname_inode_set)
392 if (afs_initState != 300)
395 ObtainWriteLock(&afs_xcell, 693);
396 afs_cellname_dirty = 0;
398 tfile = osi_UFSOpen(&afs_cellname_inode);
400 ReleaseWriteLock(&afs_xcell);
404 for (cn = afs_cellname_head; cn; cn = cn->next) {
405 afs_int32 magic, cellnum, clen;
411 magic = AFS_CELLINFO_MAGIC;
412 cc = afs_osi_Write(tfile, off, &magic, sizeof(magic));
413 if (cc != sizeof(magic))
417 cellnum = cn->cellnum;
418 cc = afs_osi_Write(tfile, off, &cellnum, sizeof(cellnum));
419 if (cc != sizeof(cellnum))
423 clen = strlen(cn->cellname);
424 cc = afs_osi_Write(tfile, off, &clen, sizeof(clen));
425 if (cc != sizeof(clen))
429 cc = afs_osi_Write(tfile, off, cn->cellname, clen);
436 ReleaseWriteLock(&afs_xcell);
441 * Cell alias implementation
443 * afs_FindCellAlias: look up cell alias by alias name
444 * afs_GetCellAlias: get cell alias by index (starting at 0)
445 * afs_PutCellAlias: put back a cell alias returned by Find or Get
446 * afs_NewCellAlias: create new cell alias entry
449 struct cell_alias *afs_cellalias_head; /* Export for kdump */
450 static afs_int32 afs_cellalias_index;
451 static int afs_CellOrAliasExists_nl(char *aname); /* Forward declaration */
454 * Look up cell alias by alias name.
456 * \return Found struct or NULL.
458 static struct cell_alias *
459 afs_FindCellAlias(char *alias)
461 struct cell_alias *tc;
463 for (tc = afs_cellalias_head; tc != NULL; tc = tc->next)
464 if (!strcmp(alias, tc->alias))
470 * Get cell alias by index (starting at 0).
471 * \param index Cell index.
472 * \return Found struct or null.
475 afs_GetCellAlias(int index)
477 struct cell_alias *tc;
479 ObtainReadLock(&afs_xcell);
480 for (tc = afs_cellalias_head; tc != NULL; tc = tc->next)
481 if (tc->index == index)
483 ReleaseReadLock(&afs_xcell);
490 * Put back a cell alias returned by Find or Get.
495 afs_PutCellAlias(struct cell_alias *a)
501 * Create new cell alias entry and update dynroot vnode.
507 afs_NewCellAlias(char *alias, char *cell)
509 struct cell_alias *tc;
511 ObtainSharedLock(&afs_xcell, 681);
512 if (afs_CellOrAliasExists_nl(alias)) {
513 ReleaseSharedLock(&afs_xcell);
517 UpgradeSToWLock(&afs_xcell, 682);
518 tc = afs_osi_Alloc(sizeof(struct cell_alias));
519 osi_Assert(tc != NULL);
520 tc->alias = afs_strdup(alias);
521 tc->cell = afs_strdup(cell);
522 tc->next = afs_cellalias_head;
523 tc->index = afs_cellalias_index++;
524 afs_cellalias_head = tc;
525 ReleaseWriteLock(&afs_xcell);
527 afs_DynrootInvalidate();
532 * Actual cell list implementation
534 * afs_UpdateCellLRU: bump given cell up to the front of the LRU queue
535 * afs_RefreshCell: look up cell information in AFSDB if timeout expired
537 * afs_TraverseCells: execute a callback for each existing cell
538 * afs_TraverseCells_nl: same as above except without locking afs_xcell
539 * afs_choose_cell_by_{name,num,index}: useful traversal callbacks
541 * afs_FindCellByName: return a cell with a given name, if it exists
542 * afs_FindCellByName_nl: same as above, without locking afs_xcell
543 * afs_GetCellByName: same as FindCellByName but tries AFSDB if not found
544 * afs_GetCell: return a cell with a given cell number
545 * afs_GetCellStale: same as GetCell, but does not try to refresh the data
546 * afs_GetCellByIndex: return a cell with a given index number (starting at 0)
548 * afs_GetPrimaryCell: return the primary cell, if any
549 * afs_IsPrimaryCell: returns true iff the given cell is the primary cell
550 * afs_IsPrimaryCellNum: returns afs_IsPrimaryCell(afs_GetCell(cellnum))
551 * afs_SetPrimaryCell: set the primary cell name to the given cell name
553 * afs_NewCell: create or update a cell entry
556 struct afs_q CellLRU; /* Export for kdump */
557 static char *afs_thiscell = NULL;
558 afs_int32 afs_cellindex; /* Export for kdump */
561 * Bump given cell up to the front of the LRU queue.
562 * \param c Cell to set.
565 afs_UpdateCellLRU(struct cell *c)
567 ObtainWriteLock(&afs_xcell, 100);
569 QAdd(&CellLRU, &c->lruq);
570 ReleaseWriteLock(&afs_xcell);
574 * Look up cell information in AFSDB if timeout expired
575 * \param ac Cell to be refreshed.
579 afs_RefreshCell(struct cell *ac)
581 if (ac->states & CNoAFSDB)
583 if (!ac->cellHosts[0] || (ac->timeout && ac->timeout <= osi_Time()))
584 afs_LookupAFSDB(ac->cellName);
588 * Execute a callback for each existing cell, without a lock on afs_xcell.
589 * Iterate on CellLRU, and execute a callback for each cell until given arguments are met.
590 * \see afs_TraverseCells
591 * \param cb Traversal callback for each cell.
592 * \param arg Callback arguments.
593 * \return Found data or NULL.
596 afs_TraverseCells_nl(void *(*cb) (struct cell *, void *), void *arg)
598 struct afs_q *cq, *tq;
602 for (cq = CellLRU.next; cq != &CellLRU; cq = tq) {
605 /* This is assuming that a NULL return is acceptable. */
621 * Execute a callback for each existing cell, with a lock on afs_xcell.
622 * \see afs_TraverseCells_nl
623 * \param cb Traversal callback for each cell.
625 * \return Found data or NULL.
628 afs_TraverseCells(void *(*cb) (struct cell *, void *), void *arg)
632 ObtainReadLock(&afs_xcell);
633 ret = afs_TraverseCells_nl(cb, arg);
634 ReleaseReadLock(&afs_xcell);
640 * Useful traversal callback: Match by name.
642 * \param arg Cell name (compared with cell->cellName).
643 * \return Returns found cell or NULL.
646 afs_choose_cell_by_name(struct cell *cell, void *arg)
652 return strcmp(cell->cellName, (char *)arg) ? NULL : cell;
657 * Useful traversal callback: Match by handle.
659 * \param arg Cell handle (compared with cell->cellHandle).
660 * \return Returns found cell or NULL.
663 afs_choose_cell_by_handle(struct cell *cell, void *arg)
669 return memcmp(cell->cellHandle, (char *)arg, 16) ? NULL : cell;
674 * Useful traversal callback: Match by cell number.
676 * \param arg Cell number (compared with cell->cellNum).
677 * \return Returns found cell or NULL.
680 afs_choose_cell_by_num(struct cell *cell, void *arg)
682 return (cell->cellNum == *((afs_int32 *) arg)) ? cell : NULL;
686 * Useful traversal callback: Match by index.
688 * \param arg Cell index (compared with cell->cellIndex).
689 * \return Returns found cell or NULL.
692 afs_choose_cell_by_index(struct cell *cell, void *arg)
694 return (cell->cellIndex == *((afs_int32 *) arg)) ? cell : NULL;
698 * Return a cell with a given name, if it exists. No lock version.
699 * Does not check AFSDB.
700 * \param acellName Cell name.
701 * \param locktype Type of lock to be used (not used).
705 afs_FindCellByName_nl(char *acellName, afs_int32 locktype)
707 return afs_TraverseCells_nl(&afs_choose_cell_by_name, acellName);
711 * Return a cell with a given name, if it exists.It uses locks.
712 * Does not check AFSDB.
713 * \param acellName Cell name.
714 * \param locktype Type of lock to be used.
718 afs_FindCellByName(char *acellName, afs_int32 locktype)
720 return afs_TraverseCells(&afs_choose_cell_by_name, acellName);
724 * Same as FindCellByName but tries AFSDB if not found.
725 * \param acellName Cell name.
726 * \param locktype Type of lock to be used.
730 afs_GetCellByName(char *acellName, afs_int32 locktype)
734 tc = afs_FindCellByName(acellName, locktype);
736 afs_LookupAFSDB(acellName);
737 tc = afs_FindCellByName(acellName, locktype);
740 afs_cellname_ref(tc->cnamep);
741 afs_UpdateCellLRU(tc);
749 * Return a cell with a given cell number.
750 * \param cellnum Cell number.
751 * \param locktype Lock to be used.
755 afs_GetCell(afs_int32 cellnum, afs_int32 locktype)
758 struct cell_name *cn;
760 tc = afs_GetCellStale(cellnum, locktype);
764 ObtainReadLock(&afs_xcell);
765 cn = afs_cellname_lookup_id(cellnum);
766 ReleaseReadLock(&afs_xcell);
768 tc = afs_GetCellByName(cn->cellname, locktype);
774 * Same as GetCell, but does not try to refresh the data.
775 * \param cellnum Cell number.
776 * \param locktype What lock should be used.
780 afs_GetCellStale(afs_int32 cellnum, afs_int32 locktype)
784 tc = afs_TraverseCells(&afs_choose_cell_by_num, &cellnum);
786 afs_cellname_ref(tc->cnamep);
787 afs_UpdateCellLRU(tc);
793 * Return a cell with a given index number (starting at 0). Update CellLRU as well.
795 * \param locktype Type of lock used.
799 afs_GetCellByIndex(afs_int32 index, afs_int32 locktype)
803 tc = afs_TraverseCells(&afs_choose_cell_by_index, &index);
805 afs_UpdateCellLRU(tc);
810 * Return a cell with a given handle..
812 * \param locktype Type of lock used.
816 afs_GetCellByHandle(void *handle, afs_int32 locktype)
820 tc = afs_TraverseCells(&afs_choose_cell_by_handle, handle);
822 afs_UpdateCellLRU(tc);
827 * Return primary cell, if any.
828 * \param locktype Type of lock used.
832 afs_GetPrimaryCell(afs_int32 locktype)
834 return afs_GetCellByName(afs_thiscell, locktype);
838 * Return number of the primary cell.
840 * Cell number, or 0 if primary cell not found
843 afs_GetPrimaryCellNum(void)
846 afs_int32 cellNum = 0;
847 cell = afs_GetPrimaryCell(READ_LOCK);
849 cellNum = cell->cellNum;
850 afs_PutCell(cell, READ_LOCK);
856 * Returns true if the given cell is the primary cell.
861 afs_IsPrimaryCell(struct cell *cell)
863 /* Simple safe checking */
866 } else if (!afs_thiscell) {
867 /* This is simply a safety net to avoid seg faults especially when
868 * using a user-space library. afs_SetPrimaryCell() should be set
869 * prior to this call. */
870 afs_SetPrimaryCell(cell->cellName);
873 return strcmp(cell->cellName, afs_thiscell) ? 0 : 1;
878 * Returns afs_IsPrimaryCell(afs_GetCell(cellnum)).
883 afs_IsPrimaryCellNum(afs_int32 cellnum)
888 tc = afs_GetCellStale(cellnum, READ_LOCK);
890 primary = afs_IsPrimaryCell(tc);
891 afs_PutCell(tc, READ_LOCK);
898 * Set the primary cell name to the given cell name.
899 * \param acellName Cell name.
900 * \return 0 for success, < 0 for error.
903 afs_SetPrimaryCell(char *acellName)
905 ObtainWriteLock(&afs_xcell, 691);
907 afs_osi_FreeStr(afs_thiscell);
908 afs_thiscell = afs_strdup(acellName);
909 ReleaseWriteLock(&afs_xcell);
914 * Create or update a cell entry.
915 * \param acellName Name of cell.
916 * \param acellHosts Array of hosts that this cell has.
917 * \param aflags Cell flags.
919 * \param fsport File server port.
920 * \param vlport Volume server port.
921 * \param timeout Cell timeout value, 0 means static AFSDB entry.
925 afs_NewCell(char *acellName, afs_int32 * acellHosts, int aflags,
926 char *linkedcname, u_short fsport, u_short vlport, int timeout)
928 struct cell *tc, *tcl = 0;
929 afs_int32 i, newc = 0, code = 0;
932 AFS_STATCNT(afs_NewCell);
934 ObtainWriteLock(&afs_xcell, 103);
936 tc = afs_FindCellByName_nl(acellName, READ_LOCK);
940 tc = afs_osi_Alloc(sizeof(struct cell));
941 osi_Assert(tc != NULL);
942 memset(tc, 0, sizeof(*tc));
943 tc->cellName = afs_strdup(acellName);
944 tc->fsport = AFS_FSPORT;
945 tc->vlport = AFS_VLPORT;
947 MD5_Update(&m, tc->cellName, strlen(tc->cellName));
948 MD5_Final(tc->cellHandle, &m);
949 AFS_RWLOCK_INIT(&tc->lock, "cell lock");
953 ObtainWriteLock(&tc->lock, 688);
955 /* If the cell we've found has the correct name but no timeout,
956 * and we're called with a non-zero timeout, bail out: never
957 * override static configuration entries with AFSDB ones.
958 * One exception: if the original cell entry had no servers,
959 * it must get servers from AFSDB.
961 if (timeout && !tc->timeout && tc->cellHosts[0]) {
962 code = EEXIST; /* This code is checked for in afs_LookupAFSDB */
966 /* we don't want to keep pinging old vlservers which were down,
967 * since they don't matter any more. It's easier to do this than
968 * to remove the server from its various hash tables. */
969 for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
970 if (!tc->cellHosts[i])
972 tc->cellHosts[i]->flags &= ~SRVR_ISDOWN;
973 tc->cellHosts[i]->flags |= SRVR_ISGONE;
981 if (aflags & CLinkedCell) {
986 tcl = afs_FindCellByName_nl(linkedcname, READ_LOCK);
991 if (tcl->lcellp) { /* XXX Overwriting if one existed before! XXX */
992 tcl->lcellp->lcellp = (struct cell *)0;
993 tcl->lcellp->states &= ~CLinkedCell;
998 tc->states |= aflags;
999 tc->timeout = timeout;
1001 memset(tc->cellHosts, 0, sizeof(tc->cellHosts));
1002 for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
1003 /* Get server for each host and link this cell in.*/
1005 afs_uint32 temp = acellHosts[i];
1008 ts = afs_GetServer(&temp, 1, 0, tc->vlport, WRITE_LOCK, NULL, 0, NULL);
1010 ts->flags &= ~SRVR_ISGONE;
1011 /* Set the server as a host of the new cell. */
1012 tc->cellHosts[i] = ts;
1013 afs_PutServer(ts, WRITE_LOCK);
1015 afs_SortServers(tc->cellHosts, AFS_MAXCELLHOSTS); /* randomize servers */
1017 /* New cell: Build and add to LRU cell queue. */
1019 struct cell_name *cn;
1021 cn = afs_cellname_lookup_name(acellName);
1023 cn = afs_cellname_new(acellName, 0);
1026 tc->cellNum = cn->cellnum;
1027 tc->cellIndex = afs_cellindex++;
1028 afs_stats_cmperf.numCellsVisible++;
1029 QAdd(&CellLRU, &tc->lruq);
1032 ReleaseWriteLock(&tc->lock);
1033 ReleaseWriteLock(&afs_xcell);
1035 if (!(aflags & CHush))
1036 afs_DynrootInvalidate();
1040 ReleaseWriteLock(&tc->lock);
1043 /* If we're a new cell, nobody else can see us, so doing this
1044 * after lock release is safe */
1045 afs_osi_FreeStr(tc->cellName);
1046 afs_osi_Free(tc, sizeof(struct cell));
1049 ReleaseWriteLock(&afs_xcell);
1054 * Miscellaneous stuff
1056 * afs_CellInit: perform whatever initialization is necessary
1057 * shutdown_cell: called on shutdown, should deallocate memory, etc
1058 * afs_RemoveCellEntry: remove a server from a cell's server list
1059 * afs_CellOrAliasExists: check if the given name exists as a cell or alias
1060 * afs_CellOrAliasExists_nl: same as above without locking afs_xcell
1061 * afs_CellNumValid: check if a cell number is valid (also set the used flag)
1065 * Perform whatever initialization is necessary.
1070 static char CellInit_done = 0;
1077 AFS_RWLOCK_INIT(&afs_xcell, "afs_xcell");
1078 AFS_RWLOCK_INIT(&afsdb_client_lock, "afsdb_client_lock");
1079 AFS_RWLOCK_INIT(&afsdb_req_lock, "afsdb_req_lock");
1083 afs_cellalias_index = 0;
1087 * Called on shutdown, should deallocate memory, etc.
1092 struct afs_q *cq, *tq;
1095 #ifdef AFS_CACHE_VNODE_PATH
1096 if (cacheDiskType != AFS_FCACHE_TYPE_MEM) {
1097 afs_osi_FreeStr(afs_cellname_inode.ufs);
1100 AFS_RWLOCK_INIT(&afs_xcell, "afs_xcell");
1102 for (cq = CellLRU.next; cq != &CellLRU; cq = tq) {
1106 afs_osi_FreeStr(tc->cellName);
1107 afs_osi_Free(tc, sizeof(struct cell));
1112 struct cell_name *cn = afs_cellname_head;
1115 struct cell_name *next = cn->next;
1117 afs_osi_FreeStr(cn->cellname);
1118 afs_osi_Free(cn, sizeof(struct cell_name));
1125 * Remove a server from a cell's server list.
1126 * \param srvp Server to be removed.
1130 afs_RemoveCellEntry(struct server *srvp)
1139 /* Remove the server structure from the cell list - if there */
1140 ObtainWriteLock(&tc->lock, 200);
1141 for (j = k = 0; j < AFS_MAXCELLHOSTS; j++) {
1142 if (!tc->cellHosts[j])
1144 if (tc->cellHosts[j] != srvp) {
1145 tc->cellHosts[k++] = tc->cellHosts[j];
1149 /* What do we do if we remove the last one? */
1151 for (; k < AFS_MAXCELLHOSTS; k++) {
1152 tc->cellHosts[k] = 0;
1154 ReleaseWriteLock(&tc->lock);
1158 * Check if the given name exists as a cell or alias. Does not lock afs_xcell.
1163 afs_CellOrAliasExists_nl(char *aname)
1166 struct cell_alias *ca;
1168 c = afs_FindCellByName_nl(aname, READ_LOCK);
1170 afs_PutCell(c, READ_LOCK);
1174 ca = afs_FindCellAlias(aname);
1176 afs_PutCellAlias(ca);
1184 * Check if the given name exists as a cell or alias. Locks afs_xcell.
1189 afs_CellOrAliasExists(char *aname)
1193 ObtainReadLock(&afs_xcell);
1194 ret = afs_CellOrAliasExists_nl(aname);
1195 ReleaseReadLock(&afs_xcell);
1201 * Check if a cell number is valid (also set the used flag).
1203 * \return 1 - true, 0 - false
1206 afs_CellNumValid(afs_int32 cellnum)
1208 struct cell_name *cn;
1210 ObtainReadLock(&afs_xcell);
1211 cn = afs_cellname_lookup_id(cellnum);
1212 ReleaseReadLock(&afs_xcell);