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libguestfs/1000-force-virtio_blk-in-old-guest-kernel.patch
Olaf Hering 3117b71d50 - change default_attach_method from appliance to libvirt if the 
distro kernel includes virtio-scsi. This is true for 12.2+
  In 12.1 and older the attach_method remains appliance.
  The reason for this change is the creation of XML for libvirt,
  which is cumbersome for virtio-blk.

OBS-URL: https://build.opensuse.org/package/show/Virtualization/libguestfs?expand=0&rev=129
2012-10-10 14:55:01 +00:00

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From 6d90239469c6de90c8a3fcb885ad2be30bf364f9 Mon Sep 17 00:00:00 2001
From: Olaf Hering <olaf@aepfle.de>
Date: Mon, 3 Sep 2012 19:50:44 +0200
Subject: [PATCH] force virtio_blk in old guest kernel
Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
df/output.c | 13 +++++++++----
fish/options.c | 8 +++++++-
src/guestfs-internal.h | 2 ++
src/guestfs.c | 16 ++++++++++++++++
src/inspect-fs-unix.c | 4 ++--
src/launch-appliance.c | 3 +++
src/launch-libvirt.c | 36 +++++++++++++++++++++++++++++++-----
test-tool/test-tool.c | 16 +++++++++++++---
8 files changed, 83 insertions(+), 15 deletions(-)
diff --git a/df/output.c b/df/output.c
index 5729dd4..f1713bb 100644
--- a/df/output.c
+++ b/df/output.c
@@ -42,6 +42,7 @@
#include "virt-df.h"
static void write_csv_field (const char *field);
+static int use_virtio_blk;
void
print_title (void)
@@ -82,7 +83,7 @@ print_title (void)
}
}
-static char *adjust_device_offset (const char *device, int offset);
+static char *adjust_device_offset (guestfs_h *g, const char *device, int offset);
void
print_stat (const char *name, const char *uuid_param,
@@ -110,7 +111,7 @@ print_stat (const char *name, const char *uuid_param,
exit (EXIT_FAILURE);
if (offset >= 0) {
char *p = dev;
- dev = adjust_device_offset (p, offset);
+ dev = adjust_device_offset (g, p, offset);
free (p);
}
@@ -237,8 +238,9 @@ write_csv_field (const char *field)
static char *drive_name (int index, char *ret);
static char *
-adjust_device_offset (const char *device, int offset)
+adjust_device_offset (guestfs_h *g, const char *device, int offset)
{
+ ;
int index;
int part_num;
char *whole_device;
@@ -282,7 +284,10 @@ adjust_device_offset (const char *device, int offset)
exit (EXIT_FAILURE);
}
- strcpy (ret, "/dev/sd");
+#ifdef GUESTFS_QEMU_NO_VIRTIO_BLK
+ use_virtio_blk = 1;
+#endif
+ strcpy (ret, use_virtio_blk ? "/dev/vd" : "/dev/sd");
drive_name (index, &ret[7]);
len = strlen (ret);
if (part_num > 0)
diff --git a/fish/options.c b/fish/options.c
index 0db790e..8f9aada 100644
--- a/fish/options.c
+++ b/fish/options.c
@@ -27,6 +27,8 @@
#include "options.h"
+static int use_virtio_blk;
+
char
add_drives (struct drv *drv, char next_drive)
{
@@ -40,13 +42,17 @@ add_drives (struct drv *drv, char next_drive)
exit (EXIT_FAILURE);
}
+#ifdef GUESTFS_QEMU_NO_VIRTIO_BLK
+ use_virtio_blk = 1;
+#endif
+
if (drv) {
next_drive = add_drives (drv->next, next_drive);
free (drv->device);
drv->device = NULL;
- if (asprintf (&drv->device, "/dev/sd%c", next_drive) == -1) {
+ if (asprintf (&drv->device, "/dev/%s%c", use_virtio_blk ? "vd" : "sd", next_drive) == -1) {
perror ("asprintf");
exit (EXIT_FAILURE);
}
diff --git a/src/guestfs-internal.h b/src/guestfs-internal.h
index afc3be4..3ecc821 100644
--- a/src/guestfs-internal.h
+++ b/src/guestfs-internal.h
@@ -289,6 +289,8 @@ struct guestfs_h
void *connv; /* libvirt connection (really virConnectPtr) */
void *domv; /* libvirt domain (really virDomainPtr) */
} virt;
+
+ int use_virtio_blk;
};
/* Per-filesystem data stored for inspect_os. */
diff --git a/src/guestfs.c b/src/guestfs.c
index cb9ee6b..be6d849 100644
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -170,6 +170,22 @@ guestfs_create (void)
}
}
+/*
+ * Currently virtio_scsi is forced if qemu in the host supports this
+ * feature. This test does however not take the capabilities of the started
+ * guest into account. As a result no disks will be found if the guest
+ * kernel is older than 3.4.
+ */
+#ifdef GUESTFS_QEMU_NO_VIRTIO_BLK
+ static const char env_string[] = "GUESTFS_QEMU_NO_VIRTIO_BLK";
+ str = getenv(env_string);
+ g->use_virtio_blk = str == NULL;
+ if (str)
+ debug (g, "SuSE: %s in environment, preserving virtio-scsi setting.", env_string);
+ else
+ debug (g, "SuSE: %s not in environment, preventing virtio-scsi usage in old guest kernel.", env_string);
+#endif
+
/* Start with large serial numbers so they are easy to spot
* inside the protocol.
*/
diff --git a/src/inspect-fs-unix.c b/src/inspect-fs-unix.c
index 2152484..593e265 100644
--- a/src/inspect-fs-unix.c
+++ b/src/inspect-fs-unix.c
@@ -1420,7 +1420,7 @@ resolve_fstab_device_diskbyid (guestfs_h *g, const char *part,
return 0;
/* Make the partition name and check it exists. */
- device = safe_asprintf (g, "/dev/sda%s", part);
+ device = safe_asprintf (g, "/dev/%sa%s", g->use_virtio_blk ? "vd" : "sd", part);
if (!is_partition (g, device)) {
free (device);
return 0;
@@ -1497,7 +1497,7 @@ resolve_fstab_device (guestfs_h *g, const char *spec, Hash_table *md_map)
if (disk_i != -1 && disk_i <= 26 &&
slice_i > 0 && slice_i <= 1 /* > 4 .. see comment above */ &&
part_i >= 0 && part_i < 26) {
- device = safe_asprintf (g, "/dev/sd%c%d", disk_i + 'a', part_i + 5);
+ device = safe_asprintf (g, "/dev/%s%c%d", g->use_virtio_blk ? "vd" : "sd", disk_i + 'a', part_i + 5);
}
}
else if ((part = match1 (g, spec, re_diskbyid)) != NULL) {
diff --git a/src/launch-appliance.c b/src/launch-appliance.c
index e353e05..1a1ddef 100644
--- a/src/launch-appliance.c
+++ b/src/launch-appliance.c
@@ -891,6 +891,9 @@ qemu_supports_virtio_scsi (guestfs_h *g)
g->app.virtio_scsi = 3;
}
+ if (g->use_virtio_blk)
+ g->app.virtio_scsi = 2;
+
return g->app.virtio_scsi == 1;
}
diff --git a/src/launch-libvirt.c b/src/launch-libvirt.c
index d678266..1b3b681 100644
--- a/src/launch-libvirt.c
+++ b/src/launch-libvirt.c
@@ -117,6 +117,12 @@ launch_libvirt (guestfs_h *g, const char *libvirt_uri)
void *buf = NULL;
int disable_svirt = is_custom_qemu (g);
+#ifdef GUESTFS_QEMU_NO_VIRTIO_BLK
+ if (g->use_virtio_blk) {
+ error (g, "Using libvirt is not possible with this binary package due to forced virtio-blk usage.");
+ return -1;
+ }
+#endif
/* At present you must add drives before starting the appliance. In
* future when we enable hotplugging you won't need to do this.
*/
@@ -612,11 +618,12 @@ construct_libvirt_xml_boot (guestfs_h *g, xmlTextWriterPtr xo,
snprintf (buf, sizeof buf,
LINUX_CMDLINE
- "root=/dev/sd%s " /* (root) */
+ "root=/dev/%s%s " /* (root) */
"%s " /* (selinux) */
"%s " /* (verbose) */
"TERM=%s " /* (TERM environment variable) */
"%s", /* (append) */
+ g->use_virtio_blk ? "vd" : "sd",
appliance_root,
g->selinux ? "selinux=1 enforcing=0" : "selinux=0",
g->verbose ? "guestfs_verbose=1" : "",
@@ -700,8 +707,17 @@ construct_libvirt_xml_devices (guestfs_h *g, xmlTextWriterPtr xo,
XMLERROR (-1, xmlTextWriterEndElement (xo));
}
- /* virtio-scsi controller. */
XMLERROR (-1, xmlTextWriterStartElement (xo, BAD_CAST "controller"));
+ if (g->use_virtio_blk) {
+ /* virtio-blk controller. */
+ XMLERROR (-1,
+ xmlTextWriterWriteAttribute (xo, BAD_CAST "type",
+ BAD_CAST "ide"));
+ XMLERROR (-1,
+ xmlTextWriterWriteAttribute (xo, BAD_CAST "index",
+ BAD_CAST "0"));
+ } else {
+ /* virtio-scsi controller. */
XMLERROR (-1,
xmlTextWriterWriteAttribute (xo, BAD_CAST "type",
BAD_CAST "scsi"));
@@ -711,6 +727,7 @@ construct_libvirt_xml_devices (guestfs_h *g, xmlTextWriterPtr xo,
XMLERROR (-1,
xmlTextWriterWriteAttribute (xo, BAD_CAST "model",
BAD_CAST "virtio-scsi"));
+ }
XMLERROR (-1, xmlTextWriterEndElement (xo));
/* Disks. */
@@ -784,6 +801,7 @@ construct_libvirt_xml_disk (guestfs_h *g, xmlTextWriterPtr xo,
char scsi_target[64];
char *path = NULL;
char *format = NULL;
+ char *bus = "scsi";
int is_host_device;
/* XXX We probably could support this if we thought about it some more. */
@@ -792,6 +810,11 @@ construct_libvirt_xml_disk (guestfs_h *g, xmlTextWriterPtr xo,
goto err;
}
+ if (g->use_virtio_blk) {
+ drive_name[0] = 'v';
+ bus = "virtio";
+ }
+
guestfs___drive_name (drv_index, &drive_name[2]);
snprintf (scsi_target, sizeof scsi_target, "%zu", drv_index);
@@ -844,7 +867,7 @@ construct_libvirt_xml_disk (guestfs_h *g, xmlTextWriterPtr xo,
BAD_CAST drive_name));
XMLERROR (-1,
xmlTextWriterWriteAttribute (xo, BAD_CAST "bus",
- BAD_CAST "scsi"));
+ BAD_CAST bus));
XMLERROR (-1, xmlTextWriterEndElement (xo));
XMLERROR (-1, xmlTextWriterStartElement (xo, BAD_CAST "driver"));
@@ -1018,6 +1041,9 @@ construct_libvirt_xml_qemu_cmdline (guestfs_h *g, xmlTextWriterPtr xo)
char attr[256];
struct qemu_param *qp;
char *p;
+ char *bus = "scsi";
+
+ bus = g->use_virtio_blk ? "ide" : "scsi";
XMLERROR (-1, xmlTextWriterStartElement (xo, BAD_CAST "qemu:commandline"));
@@ -1028,7 +1054,7 @@ construct_libvirt_xml_qemu_cmdline (guestfs_h *g, xmlTextWriterPtr xo)
for (drv = g->drives, drv_index = 0; drv; drv = drv->next, drv_index++) {
if (drv->readonly) {
snprintf (attr, sizeof attr,
- "drive.drive-scsi0-0-%zu-0.snapshot=on", drv_index);
+ "drive.drive-%s0-0-%zu-0.snapshot=on", bus, drv_index);
XMLERROR (-1, xmlTextWriterStartElement (xo, BAD_CAST "qemu:arg"));
XMLERROR (-1,
@@ -1045,7 +1071,7 @@ construct_libvirt_xml_qemu_cmdline (guestfs_h *g, xmlTextWriterPtr xo)
}
snprintf (attr, sizeof attr,
- "drive.drive-scsi0-0-%zu-0.snapshot=on", drv_index);
+ "drive.drive-%s0-0-%zu-0.snapshot=on", bus, drv_index);
XMLERROR (-1, xmlTextWriterStartElement (xo, BAD_CAST "qemu:arg"));
XMLERROR (-1,
diff --git a/test-tool/test-tool.c b/test-tool/test-tool.c
index 6f26e33..56523b3 100644
--- a/test-tool/test-tool.c
+++ b/test-tool/test-tool.c
@@ -35,6 +35,7 @@
#include <guestfs.h>
+static int use_virtio_blk;
#define _(str) dgettext(PACKAGE, (str))
//#define N_(str) dgettext(PACKAGE, (str))
@@ -103,7 +104,11 @@ main (int argc, char *argv[])
int i;
struct guestfs_version *vers;
char *p;
+ char *disk_name, *partition_name;
+#ifdef GUESTFS_QEMU_NO_VIRTIO_BLK
+ use_virtio_blk = 1;
+#endif
/* Everyone ignores the documentation, so ... */
printf (" ************************************************************\n"
" * IMPORTANT NOTICE\n"
@@ -129,6 +134,11 @@ main (int argc, char *argv[])
exit (EXIT_FAILURE);
}
+ if (asprintf(&disk_name, "/dev/%s", use_virtio_blk ? "vda" : "sda") < 0)
+ exit (EXIT_FAILURE);
+ if (asprintf(&partition_name, "%s1", disk_name) < 0)
+ exit (EXIT_FAILURE);
+
for (;;) {
c = getopt_long (argc, argv, options, long_options, &option_index);
if (c == -1) break;
@@ -251,19 +261,19 @@ main (int argc, char *argv[])
fflush (stdout);
/* Create the filesystem and mount everything. */
- if (guestfs_part_disk (g, "/dev/sda", "mbr") == -1) {
+ if (guestfs_part_disk (g, disk_name, "mbr") == -1) {
fprintf (stderr,
_("libguestfs-test-tool: failed to run part-disk\n"));
exit (EXIT_FAILURE);
}
- if (guestfs_mkfs (g, "ext2", "/dev/sda1") == -1) {
+ if (guestfs_mkfs (g, "ext2", partition_name) == -1) {
fprintf (stderr,
_("libguestfs-test-tool: failed to mkfs.ext2\n"));
exit (EXIT_FAILURE);
}
- if (guestfs_mount (g, "/dev/sda1", "/") == -1) {
+ if (guestfs_mount (g, partition_name, "/") == -1) {
fprintf (stderr,
_("libguestfs-test-tool: failed to mount /dev/sda1 on /\n"));
exit (EXIT_FAILURE);
--
1.7.12.2
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