/*
* Set up a cell for dynroot if it's not there yet.
*/
static int
afs_dynrootCellInit(void)
{
if (!afs_dynrootCell) {
afs_int32 cellHosts[AFS_MAXCELLHOSTS];
struct cell *tc;
int code;
memset(cellHosts, 0, sizeof(cellHosts));
code =
afs_NewCell(AFS_DYNROOT_CELLNAME, cellHosts, CNoSUID | CNoAFSDB,
NULL, 0, 0, 0);
if (code)
return code;
tc = afs_GetCellByName(AFS_DYNROOT_CELLNAME, READ_LOCK);
if (!tc)
return ENODEV;
afs_dynrootCell = tc->cellNum;
afs_PutCell(tc, READ_LOCK);
}
return 0;
}
/*!
* \brief Entry point for user-space AFSDB request handler.
* Reads cell data from kerlenMsg and add new cell, or alias.
* \param acellName Cell name. If a cell is found, it's name will be filled in here.
* \param acellNameLen Cell name length.
* \param kernelMsg Buffer containing data about host count, time out, and cell hosts ids.
* \return 0 for success, < 0 for error.
*/
int
afs_AFSDBHandler(char *acellName, int acellNameLen, afs_int32 * kernelMsg)
{
afs_int32 timeout, code;
afs_int32 cellHosts[AFS_MAXCELLHOSTS];
if (afsdb_handler_shutdown)
return -2;
afsdb_handler_running = 1;
ObtainSharedLock(&afsdb_req_lock, 683);
if (afsdb_req.pending) {
int i, hostCount;
UpgradeSToWLock(&afsdb_req_lock, 684);
hostCount = kernelMsg[0];
timeout = kernelMsg[1];
if (timeout)
timeout += osi_Time();
for (i = 0; i < AFS_MAXCELLHOSTS; i++) {
if (i >= hostCount)
cellHosts[i] = 0;
else
cellHosts[i] = kernelMsg[2 + i];
}
if (hostCount)
code = afs_NewCell(acellName, cellHosts, CNoSUID, NULL, 0, 0,
timeout);
if (!hostCount || (code && code != EEXIST))
/* null out the cellname if the lookup failed */
afsdb_req.cellname = NULL;
else
/* If we found an alias, create it */
if (afs_strcasecmp(afsdb_req.cellname, acellName))
afs_NewCellAlias(afsdb_req.cellname, acellName);
/* Request completed, wake up the relevant thread */
afsdb_req.pending = 0;
afsdb_req.complete = 1;
afs_osi_Wakeup(&afsdb_req);
ConvertWToSLock(&afsdb_req_lock);
}
ConvertSToRLock(&afsdb_req_lock);
/* Wait for a request */
while (afsdb_req.pending == 0 && afs_termState != AFSOP_STOP_AFSDB) {
ReleaseReadLock(&afsdb_req_lock);
afs_osi_Sleep(&afsdb_req);
ObtainReadLock(&afsdb_req_lock);
}
/* Check if we're shutting down */
if (afs_termState == AFSOP_STOP_AFSDB) {
ReleaseReadLock(&afsdb_req_lock);
/* Inform anyone waiting for us that we're going away */
afsdb_handler_shutdown = 1;
afsdb_handler_running = 0;
afs_osi_Wakeup(&afsdb_req);
afs_termState = AFSOP_STOP_RXEVENT;
afs_osi_Wakeup(&afs_termState);
return -2;
}
/* Return the lookup request to userspace */
strncpy(acellName, afsdb_req.cellname, acellNameLen);
ReleaseReadLock(&afsdb_req_lock);
return 0;
}
