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Date:      Sat, 30 Mar 2019 07:20:28 +0000 (UTC)
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r345726 - head/sys/dev/xen/blkfront
Message-ID:  <201903300720.x2U7KSmN086902@repo.freebsd.org>
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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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