svn commit: r345726 - head/sys/dev/xen/blkfront

[Pawel Jakub Dawidek]

Author: pjd
Date: Sat Mar 30 07:20:28 2019
New Revision: 345726
URL: https://svnweb.freebsd.org/changeset/base/345726

Log:
  Implement support for online disk capacity changes.
  
  Obtained from:        Fudo Security
  Tested in:    AWS

Modified:
  head/sys/dev/xen/blkfront/blkfront.c

Modified: head/sys/dev/xen/blkfront/blkfront.c
==============================================================================
--- head/sys/dev/xen/blkfront/blkfront.c        Sat Mar 30 01:56:53 2019        
(r345725)
+++ head/sys/dev/xen/blkfront/blkfront.c        Sat Mar 30 07:20:28 2019        
(r345726)
@@ -1227,11 +1227,40 @@ 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)
+       DPRINTK("blkfront.c:connect:%s.\n", xenbus_get_otherend_path(dev));
+
+       if (sc->xbd_state == XBD_STATE_SUSPENDED) {
                return;
+       }
 
-       DPRINTK("blkfront.c:connect:%s.\n", xenbus_get_otherend_path(dev));
+       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,
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