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update_plex_config: Eliminate a potential divide-by-zero. 

Tripped-over-by: Karl Pielorz <kpielorz@tdx.co.uk>
This commit is contained in:
Greg Lehey 1999-04-09 01:20:22 +00:00
parent 4a10e91653
commit d85bfa1067
1 changed files with 15 additions and 13 deletions
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28
sys/dev/vinum/vinumconfig.c
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@ -1826,19 +1826,21 @@ update_plex_config(int plexno, int diskconfig)
* the stripe size. If not, trim off the end
* of each subdisk and return it to the drive.
*/
remainder = (int) (plex->length % ((u_int64_t) plex->stripesize * data_sds)); /* are we exact? */
if (remainder) { /* no */
log(LOG_INFO, "vinum: removing %d blocks of partial stripe at the end of %s\n",
remainder,
plex->name);
plex->length -= remainder; /* shorten the plex */
remainder /= data_sds; /* spread the remainder amongst the sds */
for (sdno = 0; sdno < plex->subdisks; sdno++) {
sd = &SD[plex->sdnos[sdno]]; /* point to the subdisk */
return_drive_space(sd->driveno, /* return the space */
sd->driveoffset + sd->sectors - remainder,
remainder);
sd->sectors -= remainder; /* and shorten it */
if (plex->length > 0) {
remainder = (int) (plex->length % ((u_int64_t) plex->stripesize * data_sds)); /* are we exact? */
if (remainder) { /* no */
log(LOG_INFO, "vinum: removing %d blocks of partial stripe at the end of %s\n",
remainder,
plex->name);
plex->length -= remainder; /* shorten the plex */
remainder /= data_sds; /* spread the remainder amongst the sds */
for (sdno = 0; sdno < plex->subdisks; sdno++) {
sd = &SD[plex->sdnos[sdno]]; /* point to the subdisk */
return_drive_space(sd->driveno, /* return the space */
sd->driveoffset + sd->sectors - remainder,
remainder);
sd->sectors -= remainder; /* and shorten it */
}
}
}
}