[libvirt PATCH v2 07/12] nodedev: driver: Create a generic mdevctl command translator
Jonathon Jongsma
jjongsma at redhat.com
Tue Apr 13 20:39:43 UTC 2021
From: Erik Skultety <eskultet at redhat.com>
Currently there are dedicated wrappers to construct mdevctl command.
These are mostly fine except for the one that translates both "start"
and "define" commands, only because mdevctl takes the same set of
arguments. Instead, keep the wrappers, but let them call a single
global translator that handles all the mdevctl command differences and
commonalities.
Signed-off-by: Erik Skultety <eskultet at redhat.com>
Signed-off-by: Jonathon Jongsma <jjongsma at redhat.com>
---
src/node_device/node_device_driver.c | 125 ++++++++++++++++-----------
src/node_device/node_device_driver.h | 6 +-
tests/nodedevmdevctltest.c | 4 +-
3 files changed, 79 insertions(+), 56 deletions(-)
diff --git a/src/node_device/node_device_driver.c b/src/node_device/node_device_driver.c
index da55e386f0..bbb01c3967 100644
--- a/src/node_device/node_device_driver.c
+++ b/src/node_device/node_device_driver.c
@@ -702,42 +702,75 @@ nodeDeviceFindAddressByName(const char *name)
}
-/* the mdevctl 'start' and 'define' commands accept almost the exact same
- * arguments, so provide a common implementation that can be wrapped by a more
- * specific function */
-static virCommand*
-nodeDeviceGetMdevctlDefineCreateCommand(virNodeDeviceDef *def,
- const char *subcommand,
- char **uuid_out,
- char **errmsg)
+static virCommand *
+nodeDeviceGetMdevctlCommand(virNodeDeviceDef *def,
+ virMdevctlCommand cmd_type,
+ char **outbuf,
+ char **errbuf)
{
- virCommand *cmd;
- g_autofree char *json = NULL;
- g_autofree char *parent_addr = nodeDeviceFindAddressByName(def->parent);
-
- if (!parent_addr) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- _("unable to find parent device '%s'"), def->parent);
- return NULL;
+ g_autofree char *parent_addr = NULL;
+ virCommand *cmd = NULL;
+ const char *subcommand = virMdevctlCommandTypeToString(cmd_type);
+ g_autofree char *inbuf = NULL;
+
+ switch (cmd_type) {
+ case MDEVCTL_CMD_CREATE:
+ /* now is the time to make sure "create" is replaced with "start" on
+ * mdevctl cmdline */
+ cmd = virCommandNewArgList(MDEVCTL, "start", NULL);
+ break;
+ case MDEVCTL_CMD_STOP:
+ case MDEVCTL_CMD_START:
+ case MDEVCTL_CMD_DEFINE:
+ case MDEVCTL_CMD_UNDEFINE:
+ cmd = virCommandNewArgList(MDEVCTL, subcommand, NULL);
+ break;
+ case MDEVCTL_CMD_LAST:
+ default:
+ /* SHOULD NEVER HAPPEN */
+ break;
}
- if (nodeDeviceDefToMdevctlConfig(def, &json) < 0) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("couldn't convert node device def to mdevctl JSON"));
- return NULL;
- }
+ switch (cmd_type) {
+ case MDEVCTL_CMD_CREATE:
+ case MDEVCTL_CMD_DEFINE:
+ parent_addr = nodeDeviceFindAddressByName(def->parent);
- cmd = virCommandNewArgList(MDEVCTL, subcommand, NULL);
- virCommandAddArgPair(cmd, "--parent", parent_addr);
- virCommandAddArgPair(cmd, "--jsonfile", "/dev/stdin");
+ if (!parent_addr) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("unable to find parent device '%s'"), def->parent);
+ return NULL;
+ }
+
+ if (nodeDeviceDefToMdevctlConfig(def, &inbuf) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("couldn't convert node device def to mdevctl JSON"));
+ return NULL;
+ }
- virCommandSetInputBuffer(cmd, json);
+ virCommandAddArgPair(cmd, "--parent", parent_addr);
+ virCommandAddArgPair(cmd, "--jsonfile", "/dev/stdin");
+
+ virCommandSetInputBuffer(cmd, inbuf);
+ virCommandSetOutputBuffer(cmd, outbuf);
+ break;
+
+ case MDEVCTL_CMD_UNDEFINE:
+ case MDEVCTL_CMD_STOP:
+ case MDEVCTL_CMD_START:
+ /* No special handling here, we only need to pass UUID with these */
+ break;
+ case MDEVCTL_CMD_LAST:
+ default:
+ /* SHOULD NEVER HAPPEN */
+ break;
+ }
+ /* Fill in UUID for commands that need it */
if (def->caps->data.mdev.uuid)
virCommandAddArgPair(cmd, "--uuid", def->caps->data.mdev.uuid);
- virCommandSetOutputBuffer(cmd, uuid_out);
- virCommandSetErrorBuffer(cmd, errmsg);
+ virCommandSetErrorBuffer(cmd, errbuf);
return cmd;
}
@@ -747,8 +780,7 @@ nodeDeviceGetMdevctlCreateCommand(virNodeDeviceDef *def,
char **uuid_out,
char **errmsg)
{
- return nodeDeviceGetMdevctlDefineCreateCommand(def, "start", uuid_out,
- errmsg);
+ return nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_CREATE, uuid_out, errmsg);
}
virCommand*
@@ -756,8 +788,7 @@ nodeDeviceGetMdevctlDefineCommand(virNodeDeviceDef *def,
char **uuid_out,
char **errmsg)
{
- return nodeDeviceGetMdevctlDefineCreateCommand(def, "define", uuid_out,
- errmsg);
+ return nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_DEFINE, uuid_out, errmsg);
}
@@ -891,31 +922,24 @@ nodeDeviceCreateXML(virConnectPtr conn,
virCommand *
-nodeDeviceGetMdevctlStopCommand(const char *uuid, char **errmsg)
+nodeDeviceGetMdevctlStopCommand(virNodeDeviceDef *def,
+ char **errmsg)
{
- virCommand *cmd = virCommandNewArgList(MDEVCTL, "stop", NULL);
- virCommandAddArgPair(cmd, "--uuid", uuid);
- virCommandSetErrorBuffer(cmd, errmsg);
- return cmd;
-
+ return nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_STOP, NULL, errmsg);
}
virCommand *
-nodeDeviceGetMdevctlUndefineCommand(const char *uuid, char **errmsg)
+nodeDeviceGetMdevctlUndefineCommand(virNodeDeviceDef *def,
+ char **errmsg)
{
- virCommand *cmd = virCommandNewArgList(MDEVCTL, "undefine", NULL);
- virCommandAddArgPair(cmd, "--uuid", uuid);
- virCommandSetErrorBuffer(cmd, errmsg);
- return cmd;
+ return nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_UNDEFINE, NULL, errmsg);
}
virCommand *
-nodeDeviceGetMdevctlStartCommand(const char *uuid, char **errmsg)
+nodeDeviceGetMdevctlStartCommand(virNodeDeviceDef *def,
+ char **errmsg)
{
- virCommand *cmd = virCommandNewArgList(MDEVCTL, "start", NULL);
- virCommandAddArgPair(cmd, "--uuid", uuid);
- virCommandSetErrorBuffer(cmd, errmsg);
- return cmd;
+ return nodeDeviceGetMdevctlCommand(def, MDEVCTL_CMD_START, NULL, errmsg);
}
static int
@@ -924,7 +948,7 @@ virMdevctlStop(virNodeDeviceDef *def, char **errmsg)
int status;
g_autoptr(virCommand) cmd = NULL;
- cmd = nodeDeviceGetMdevctlStopCommand(def->caps->data.mdev.uuid, errmsg);
+ cmd = nodeDeviceGetMdevctlStopCommand(def, errmsg);
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
@@ -939,8 +963,7 @@ virMdevctlUndefine(virNodeDeviceDef *def, char **errmsg)
int status;
g_autoptr(virCommand) cmd = NULL;
- cmd = nodeDeviceGetMdevctlUndefineCommand(def->caps->data.mdev.uuid,
- errmsg);
+ cmd = nodeDeviceGetMdevctlUndefineCommand(def, errmsg);
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
@@ -955,7 +978,7 @@ virMdevctlStart(virNodeDeviceDef *def, char **errmsg)
int status;
g_autoptr(virCommand) cmd = NULL;
- cmd = nodeDeviceGetMdevctlStartCommand(def->caps->data.mdev.uuid, errmsg);
+ cmd = nodeDeviceGetMdevctlStartCommand(def, errmsg);
if (virCommandRun(cmd, &status) < 0 || status != 0)
return -1;
diff --git a/src/node_device/node_device_driver.h b/src/node_device/node_device_driver.h
index d06efbf354..105a71dd93 100644
--- a/src/node_device/node_device_driver.h
+++ b/src/node_device/node_device_driver.h
@@ -152,11 +152,11 @@ nodeDeviceGetMdevctlDefineCommand(virNodeDeviceDef *def,
char **errmsg);
virCommand *
-nodeDeviceGetMdevctlStopCommand(const char *uuid,
+nodeDeviceGetMdevctlStopCommand(virNodeDeviceDef *def,
char **errmsg);
virCommand *
-nodeDeviceGetMdevctlUndefineCommand(const char *uuid,
+nodeDeviceGetMdevctlUndefineCommand(virNodeDeviceDef *def,
char **errmsg);
virCommand *
@@ -181,7 +181,7 @@ bool nodeDeviceDefCopyFromMdevctl(virNodeDeviceDef *dst,
virNodeDeviceDef *src);
virCommand*
-nodeDeviceGetMdevctlStartCommand(const char *uuid,
+nodeDeviceGetMdevctlStartCommand(virNodeDeviceDef *def,
char **errmsg);
int
diff --git a/tests/nodedevmdevctltest.c b/tests/nodedevmdevctltest.c
index cf8de852a8..188bad6e53 100644
--- a/tests/nodedevmdevctltest.c
+++ b/tests/nodedevmdevctltest.c
@@ -115,7 +115,7 @@ testMdevctlCreateOrDefineHelper(const void *data)
mdevxml, cmdlinefile, jsonfile);
}
-typedef virCommand* (*GetStopUndefineCmdFunc)(const char *uuid, char **errbuf);
+typedef virCommand* (*GetStopUndefineCmdFunc)(virNodeDeviceDef *def, char **errbuf);
struct UuidCommandTestInfo {
const char *filename;
virMdevctlCommand command;
@@ -136,7 +136,7 @@ testMdevctlUuidCommand(GetStopUndefineCmdFunc func,
if (!(def = virNodeDeviceDefParseFile(mdevxml, EXISTING_DEVICE, "QEMU")))
goto cleanup;
- cmd = func(def->caps->data.mdev.uuid, &errmsg);
+ cmd = func(def, &errmsg);
if (!cmd)
goto cleanup;
--
2.26.3
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