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Implement support for online disk capacity changes.

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Obtained from:	Fudo Security
Tested in:	AWS
This commit is contained in:
Pawel Jakub Dawidek 2019-03-30 07:20:28 +00:00
parent b89cf12cc6
commit e55624c605
1 changed files with 33 additions and 4 deletions
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37
sys/dev/xen/blkfront/blkfront.c
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@ -1227,12 +1227,41 @@ xbd_connect(struct xbd_softc *sc)
int err, feature_barrier, feature_flush;
int i, j;
if (sc->xbd_state == XBD_STATE_CONNECTED ||
sc->xbd_state == XBD_STATE_SUSPENDED)
return;
DPRINTK("blkfront.c:connect:%s.\n", xenbus_get_otherend_path(dev));
if (sc->xbd_state == XBD_STATE_SUSPENDED) {
return;
}
if (sc->xbd_state == XBD_STATE_CONNECTED) {
struct disk *disk;
disk = sc->xbd_disk;
if (disk == NULL) {
return;
}
err = xs_gather(XST_NIL, xenbus_get_otherend_path(dev),
"sectors", "%lu", &sectors, NULL);
if (err != 0) {
xenbus_dev_error(dev, err,
"reading sectors at %s",
xenbus_get_otherend_path(dev));
return;
}
disk->d_mediasize = disk->d_sectorsize * sectors;
err = disk_resize(disk, M_NOWAIT);
if (err) {
xenbus_dev_error(dev, err,
"unable to resize disk %s%u",
disk->d_name, disk->d_unit);
return;
}
device_printf(sc->xbd_dev,
"changed capacity to %jd\n",
(intmax_t)disk->d_mediasize);
return;
}
err = xs_gather(XST_NIL, xenbus_get_otherend_path(dev),
"sectors", "%lu", &sectors,
"info", "%u", &binfo,