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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2] 4.1.2 blktap2 cleanup fixes.
Hello,
IanJ: Just a reminder to commit these two patches to xen-4.1-testing..
It'd be good to have them for Xen 4.1.4.
Thanks,
-- Pasi
On Wed, Nov 07, 2012 at 08:22:28AM +0100, Ian Campbell wrote:
> On Wed, 2012-11-07 at 02:06 +0000, Dr. Greg Wettstein wrote:
> > ---------------------------------------------------------------------------
> > Backport of the following patch from development:
> >
> > # User Ian Campbell <[hidden email]>
> > # Date 1309968705 -3600
> > # Node ID e4781aedf817c5ab36f6f3077e44c43c566a2812
> > # Parent 700d0f03d50aa6619d313c1ff6aea7fd429d28a7
> > libxl: attempt to cleanup tapdisk processes on disk backend destroy.
> >
> > This patch properly terminates the tapdisk2 process(es) started
> > to service a virtual block device.
> >
> > Signed-off-by: Greg Wettstein <greg@xxxxxxxxxxxx>
>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
>
> >
> > diff -r 700d0f03d50a tools/blktap2/control/tap-ctl-list.c
> > --- a/tools/blktap2/control/tap-ctl-list.c Mon Oct 29 09:04:48 2012 +0100
> > +++ b/tools/blktap2/control/tap-ctl-list.c Tue Nov 06 19:52:48 2012 -0600
> > @@ -506,17 +506,15 @@ out:
> > }
> >
> > int
> > -tap_ctl_find_minor(const char *type, const char *path)
> > +tap_ctl_find(const char *type, const char *path, tap_list_t *tap)
> > {
> > tap_list_t **list, **_entry;
> > - int minor, err;
> > + int ret = -ENOENT, err;
> >
> > err = tap_ctl_list(&list);
> > if (err)
> > return err;
> >
> > - minor = -1;
> > -
> > for (_entry = list; *_entry != NULL; ++_entry) {
> > tap_list_t *entry = *_entry;
> >
> > @@ -526,11 +524,13 @@ tap_ctl_find_minor(const char *type, con
> > if (path && (!entry->path || strcmp(entry->path, path)))
> > continue;
> >
> > - minor = entry->minor;
> > + *tap = *entry;
> > + tap->type = tap->path = NULL;
> > + ret = 0;
> > break;
> > }
> >
> > tap_ctl_free_list(list);
> >
> > - return minor >= 0 ? minor : -ENOENT;
> > + return ret;
> > }
> > diff -r 700d0f03d50a tools/blktap2/control/tap-ctl.h
> > --- a/tools/blktap2/control/tap-ctl.h Mon Oct 29 09:04:48 2012 +0100
> > +++ b/tools/blktap2/control/tap-ctl.h Tue Nov 06 19:52:48 2012 -0600
> > @@ -76,7 +76,7 @@ int tap_ctl_get_driver_id(const char *ha
> >
> > int tap_ctl_list(tap_list_t ***list);
> > void tap_ctl_free_list(tap_list_t **list);
> > -int tap_ctl_find_minor(const char *type, const char *path);
> > +int tap_ctl_find(const char *type, const char *path, tap_list_t *tap);
> >
> > int tap_ctl_allocate(int *minor, char **devname);
> > int tap_ctl_free(const int minor);
> > diff -r 700d0f03d50a tools/libxl/libxl_blktap2.c
> > --- a/tools/libxl/libxl_blktap2.c Mon Oct 29 09:04:48 2012 +0100
> > +++ b/tools/libxl/libxl_blktap2.c Tue Nov 06 19:52:48 2012 -0600
> > @@ -18,6 +18,8 @@
> >
> > #include "tap-ctl.h"
> >
> > +#include <string.h>
> > +
> > int libxl__blktap_enabled(libxl__gc *gc)
> > {
> > const char *msg;
> > @@ -30,12 +32,13 @@ const char *libxl__blktap_devpath(libxl_
> > {
> > const char *type;
> > char *params, *devname = NULL;
> > - int minor, err;
> > + tap_list_t tap;
> > + int err;
> >
> > type = libxl__device_disk_string_of_format(format);
> > - minor = tap_ctl_find_minor(type, disk);
> > - if (minor >= 0) {
> > - devname = libxl__sprintf(gc, "/dev/xen/blktap-2/tapdev%d", minor);
> > + err = tap_ctl_find(type, disk, &tap);
> > + if (err == 0) {
> > + devname = libxl__sprintf(gc, "/dev/xen/blktap-2/tapdev%d",
> > tap.minor);
> > if (devname)
> > return devname;
> > }
> > @@ -49,3 +52,28 @@ const char *libxl__blktap_devpath(libxl_
> >
> > return NULL;
> > }
> > +
> > +
> > +void libxl__device_destroy_tapdisk(libxl__gc *gc, char *be_path)
> > +{
> > + char *path, *params, *type, *disk;
> > + int err;
> > + tap_list_t tap;
> > +
> > + path = libxl__sprintf(gc, "%s/tapdisk-params", be_path);
> > + if (!path) return;
> > +
> > + params = libxl__xs_read(gc, XBT_NULL, path);
> > + if (!params) return;
> > +
> > + type = params;
> > + disk = strchr(params, ':');
> > + if (!disk) return;
> > +
> > + *disk++ = '\0';
> > +
> > + err = tap_ctl_find(type, disk, &tap);
> > + if (err < 0) return;
> > +
> > + tap_ctl_destroy(tap.id, tap.minor);
> > +}
> > diff -r 700d0f03d50a tools/libxl/libxl_device.c
> > --- a/tools/libxl/libxl_device.c Mon Oct 29 09:04:48 2012 +0100
> > +++ b/tools/libxl/libxl_device.c Tue Nov 06 19:52:48 2012 -0600
> > @@ -250,6 +250,7 @@ int libxl__device_destroy(libxl_ctx *ctx
> > if (!state)
> > goto out;
> > if (atoi(state) != 4) {
> > + libxl__device_destroy_tapdisk(&gc, be_path);
> > xs_rm(ctx->xsh, XBT_NULL, be_path);
> > goto out;
> > }
> > @@ -368,6 +369,7 @@ int libxl__devices_destroy(libxl_ctx *ct
> > }
> > }
> > }
> > + libxl__device_destroy_tapdisk(&gc, be_path);
> > out:
> > libxl__free_all(&gc);
> > return 0;
> > diff -r 700d0f03d50a tools/libxl/libxl_internal.h
> > --- a/tools/libxl/libxl_internal.h Mon Oct 29 09:04:48 2012 +0100
> > +++ b/tools/libxl/libxl_internal.h Tue Nov 06 19:52:48 2012 -0600
> > @@ -314,6 +314,12 @@ _hidden const char *libxl__blktap_devpat
> > const char *disk,
> > libxl_disk_format format);
> >
> > +/* libxl__device_destroy_tapdisk:
> > + * Destroys any tapdisk process associated with the backend represented
> > + * by be_path.
> > + */
> > +_hidden void libxl__device_destroy_tapdisk(libxl__gc *gc, char *be_path);
> > +
> > _hidden char *libxl__uuid2string(libxl__gc *gc, const libxl_uuid uuid);
> >
> > struct libxl__xen_console_reader {
> > diff -r 700d0f03d50a tools/libxl/libxl_noblktap2.c
> > --- a/tools/libxl/libxl_noblktap2.c Mon Oct 29 09:04:48 2012 +0100
> > +++ b/tools/libxl/libxl_noblktap2.c Tue Nov 06 19:52:48 2012 -0600
> > @@ -27,3 +27,7 @@ const char *libxl__blktap_devpath(libxl_
> > {
> > return NULL;
> > }
> > +
> > +void libxl__device_destroy_tapdisk(libxl__gc *gc, char *be_path)
> > +{
> > +}
> > ---------------------------------------------------------------------------
> >
> > As always,
> > Dr. G.W. Wettstein, Ph.D. Enjellic Systems Development, LLC.
> > 4206 N. 19th Ave. Specializing in information infra-structure
> > Fargo, ND 58102 development.
> > PH: 701-281-1686
> > FAX: 701-281-3949 EMAIL: greg@xxxxxxxxxxxx
> > ------------------------------------------------------------------------------
> > "Man, despite his artistic pretensions, his sophistication and many
> > accomplishments, owes the fact of his existence to a six-inch layer of
> > topsoil and the fact that it rains."
> > -- Anonymous writer on perspective.
> > GAUSSIAN quote.
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
>
>
>
> _______________________________________________
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> http://lists.xen.org/xen-devel
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