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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] libxl: remove console 0 backend directory from xenstore on devices destroy
# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1286207114 -3600
# Node ID 9e0d9b5460dc1c3cad0f5576157ac10b4045b4de
# Parent a2c40fa3bc6c8471e1988e445f449975cf6f3822
libxl: remove console 0 backend directory from xenstore on devices destroy
The first PV console device has an unusual frontend path for
historical reasons (/local/domain/<domid>/console rather than
/local/domain/<domid>/device/console/0).
Therefore we need to check this additional frontend path as well as
those under /local/domain/<domid>/device when tearing down all
backends or else we miss the backend for the console.
As part of this we need to ensure that the frontend directory has a
valid link to the backend, currently this link does not exist.
Fix this by allowing libxl__device_generic_add to take an optional
frontend path suffix relative to the dompath allowing us to use the
function even for setting up the special case frontend.
This also fixes the link from backend to frontend which until now gave
a dangling link to the normal device path instead of the exceptional
one.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
diff -r a2c40fa3bc6c -r 9e0d9b5460dc tools/libxl/libxl.c
--- a/tools/libxl/libxl.c Mon Oct 04 15:39:30 2010 +0100
+++ b/tools/libxl/libxl.c Mon Oct 04 16:45:14 2010 +0100
@@ -1897,7 +1897,7 @@ int libxl_device_disk_add(libxl_ctx *ctx
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(&gc, back, boffset),
- libxl__xs_kvs_of_flexarray(&gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(&gc, front, foffset),
NULL);
rc = 0;
@@ -2047,7 +2047,7 @@ int libxl_device_nic_add(libxl_ctx *ctx,
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(&gc, back, boffset),
- libxl__xs_kvs_of_flexarray(&gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(&gc, front, foffset),
NULL);
/* FIXME: wait for plug */
rc = 0;
@@ -2232,7 +2232,7 @@ int libxl_device_net2_add(libxl_ctx *ctx
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(&gc, back, boffset),
- libxl__xs_kvs_of_flexarray(&gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(&gc, front, foffset),
NULL);
/* FIXME: wait for plug */
rc = 0;
@@ -2324,36 +2324,13 @@ int libxl_device_console_add(libxl_ctx *
int libxl_device_console_add(libxl_ctx *ctx, uint32_t domid,
libxl_device_console *console)
{
libxl__gc gc = LIBXL_INIT_GC(ctx);
+ char *frontend_path = NULL;
flexarray_t *front;
flexarray_t *back;
unsigned int boffset = 0;
unsigned int foffset = 0;
libxl__device device;
int rc;
-
- if (console->build_state) {
- xs_transaction_t t;
- char **ents = (char **) libxl__calloc(&gc, 11, sizeof(char *));
- ents[0] = "console/port";
- ents[1] = libxl__sprintf(&gc, "%"PRIu32,
console->build_state->console_port);
- ents[2] = "console/ring-ref";
- ents[3] = libxl__sprintf(&gc, "%lu",
console->build_state->console_mfn);
- ents[4] = "console/limit";
- ents[5] = libxl__sprintf(&gc, "%d", LIBXL_XENCONSOLE_LIMIT);
- ents[6] = "console/type";
- if (console->consback == LIBXL_CONSBACK_XENCONSOLED)
- ents[7] = "xenconsoled";
- else
- ents[7] = "ioemu";
- ents[8] = "console/output";
- ents[9] = console->output;
-retry_transaction:
- t = xs_transaction_start(ctx->xsh);
- libxl__xs_writev(&gc, t, libxl__xs_get_dompath(&gc, console->domid),
ents);
- if (!xs_transaction_end(ctx->xsh, t, 0))
- if (errno == EAGAIN)
- goto retry_transaction;
- }
front = flexarray_make(16, 1);
if (!front) {
@@ -2384,29 +2361,40 @@ retry_transaction:
flexarray_set(back, boffset++, "protocol");
flexarray_set(back, boffset++, LIBXL_XENCONSOLE_PROTOCOL);
- /* if devid == 0 do not add the frontend to device/console/ because
- * it has already been added to console/ */
- if (device.devid > 0) {
- flexarray_set(front, foffset++, "backend-id");
- flexarray_set(front, foffset++, libxl__sprintf(&gc, "%d",
console->backend_domid));
+ flexarray_set(front, foffset++, "backend-id");
+ flexarray_set(front, foffset++, libxl__sprintf(&gc, "%d",
console->backend_domid));
+ flexarray_set(front, foffset++, "limit");
+ flexarray_set(front, foffset++, libxl__sprintf(&gc, "%d",
LIBXL_XENCONSOLE_LIMIT));
+ flexarray_set(front, foffset++, "type");
+ if (console->consback == LIBXL_CONSBACK_XENCONSOLED)
+ flexarray_set(front, foffset++, "xenconsoled");
+ else
+ flexarray_set(front, foffset++, "ioemu");
+ flexarray_set(front, foffset++, "output");
+ flexarray_set(front, foffset++, console->output);
+
+ if (device.devid == 0) {
+ if (console->build_state == NULL) {
+ rc = ERROR_INVAL;
+ goto out_free;
+ }
+ frontend_path = "console";
+
+ flexarray_set(front, foffset++, "port");
+ flexarray_set(front, foffset++, libxl__sprintf(&gc, "%"PRIu32,
console->build_state->console_port));
+ flexarray_set(front, foffset++, "ring-ref");
+ flexarray_set(front, foffset++, libxl__sprintf(&gc, "%lu",
console->build_state->console_mfn));
+ } else {
flexarray_set(front, foffset++, "state");
flexarray_set(front, foffset++, libxl__sprintf(&gc, "%d", 1));
- flexarray_set(front, foffset++, "limit");
- flexarray_set(front, foffset++, libxl__sprintf(&gc, "%d",
LIBXL_XENCONSOLE_LIMIT));
flexarray_set(front, foffset++, "protocol");
flexarray_set(front, foffset++, LIBXL_XENCONSOLE_PROTOCOL);
- flexarray_set(front, foffset++, "type");
- if (console->consback == LIBXL_CONSBACK_XENCONSOLED)
- flexarray_set(front, foffset++, "xenconsoled");
- else
- flexarray_set(front, foffset++, "ioemu");
- flexarray_set(front, foffset++, "output");
- flexarray_set(front, foffset++, console->output);
}
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(&gc, back, boffset),
- libxl__xs_kvs_of_flexarray(&gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(&gc, front, foffset),
+ frontend_path);
rc = 0;
out_free:
flexarray_free(back);
@@ -2461,7 +2449,7 @@ int libxl_device_vkb_add(libxl_ctx *ctx,
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(&gc, back, boffset),
- libxl__xs_kvs_of_flexarray(&gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(&gc, front, foffset),
NULL);
rc = 0;
out_free:
flexarray_free(back);
@@ -2722,7 +2710,7 @@ int libxl_device_vfb_add(libxl_ctx *ctx,
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(&gc, back, boffset),
- libxl__xs_kvs_of_flexarray(&gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(&gc, front, foffset),
NULL);
rc = 0;
out_free:
flexarray_free(front);
diff -r a2c40fa3bc6c -r 9e0d9b5460dc tools/libxl/libxl_device.c
--- a/tools/libxl/libxl_device.c Mon Oct 04 15:39:30 2010 +0100
+++ b/tools/libxl/libxl_device.c Mon Oct 04 16:45:14 2010 +0100
@@ -40,10 +40,10 @@ static const char *string_of_kinds[] = {
};
int libxl__device_generic_add(libxl_ctx *ctx, libxl__device *device,
- char **bents, char **fents)
+ char **bents, char **fents, char *frontend_path)
{
libxl__gc gc = LIBXL_INIT_GC(ctx);
- char *dom_path_backend, *dom_path, *frontend_path, *backend_path;
+ char *dom_path_backend, *dom_path, *backend_path;
xs_transaction_t t;
struct xs_permissions frontend_perms[2];
struct xs_permissions backend_perms[2];
@@ -57,8 +57,12 @@ int libxl__device_generic_add(libxl_ctx
dom_path_backend = libxl__xs_get_dompath(&gc, device->backend_domid);
dom_path = libxl__xs_get_dompath(&gc, device->domid);
- frontend_path = libxl__sprintf(&gc, "%s/device/%s/%d",
- dom_path, string_of_kinds[device->kind],
device->devid);
+ if (frontend_path)
+ frontend_path = libxl__sprintf(&gc, "%s/%s",
+ dom_path, frontend_path);
+ else
+ frontend_path = libxl__sprintf(&gc, "%s/device/%s/%d",
+ dom_path,
string_of_kinds[device->kind], device->devid);
backend_path = libxl__sprintf(&gc, "%s/backend/%s/%u/%d",
dom_path_backend,
string_of_kinds[device->backend_kind], device->domid, device->devid);
@@ -326,6 +330,16 @@ int libxl__devices_destroy(libxl_ctx *ct
}
}
}
+
+ /* console 0 frontend directory is not under /local/domain/<domid>/device
*/
+ fe_path = libxl__sprintf(&gc, "/local/domain/%d/console", domid);
+ be_path = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/backend",
fe_path));
+ if (be_path && strcmp(be_path, "")) {
+ if (libxl__device_destroy(ctx, be_path, force) > 0)
+ n_watches++;
+ flexarray_set(toremove, n++, libxl__dirname(&gc, be_path));
+ }
+
if (!force) {
/* Linux-ism. Most implementations leave the timeout
* untouched after select. Linux, however, will chip
diff -r a2c40fa3bc6c -r 9e0d9b5460dc tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Mon Oct 04 15:39:30 2010 +0100
+++ b/tools/libxl/libxl_internal.h Mon Oct 04 16:45:14 2010 +0100
@@ -171,7 +171,7 @@ _hidden int libxl__device_disk_dev_numbe
_hidden int libxl__device_disk_dev_number(char *virtpath);
_hidden int libxl__device_generic_add(libxl_ctx *ctx, libxl__device *device,
- char **bents, char **fents);
+ char **bents, char **fents, char
*frontend_path);
_hidden int libxl__device_del(libxl_ctx *ctx, libxl__device *dev, int wait);
_hidden int libxl__device_destroy(libxl_ctx *ctx, char *be_path, int force);
_hidden int libxl__devices_destroy(libxl_ctx *ctx, uint32_t domid, int force);
diff -r a2c40fa3bc6c -r 9e0d9b5460dc tools/libxl/libxl_pci.c
--- a/tools/libxl/libxl_pci.c Mon Oct 04 15:39:30 2010 +0100
+++ b/tools/libxl/libxl_pci.c Mon Oct 04 16:45:14 2010 +0100
@@ -280,7 +280,7 @@ static int libxl_create_pci_backend(libx
libxl__device_generic_add(ctx, &device,
libxl__xs_kvs_of_flexarray(gc, back, boffset),
- libxl__xs_kvs_of_flexarray(gc, front, foffset));
+ libxl__xs_kvs_of_flexarray(gc, front, foffset),
NULL);
flexarray_free(back);
flexarray_free(front);
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