On Fri, Nov 12, 2010 at 04:22:35PM +0000, Daniel P. Berrange wrote:
> The following series of patches are adding significant
> extra functionality to the iSCSI driver. THe current
> internal helper methods are not sufficiently flexible
> to cope with these changes. This patch refactors the
> code to avoid needing to have a virStoragePoolObjPtr
> instance as a parameter, instead passing individual
> target, portal and initiatoriqn parameters.
What's your motivation for removing the struct and passing the
parameters individually? It's clearly not wrong, but why generate the
code churn if it's not required?
> It also removes hardcoding of port 3260 in the portal
> address, instead using the XML value if any.
ACK
> * src/storage/storage_backend_iscsi.c: Refactor internal
> helper methods
> ---
> src/storage/storage_backend_iscsi.c | 251
> +++++++++++++++++------------------
> 1 files changed, 125 insertions(+), 126 deletions(-)
>
> diff --git a/src/storage/storage_backend_iscsi.c
> b/src/storage/storage_backend_iscsi.c
> index 06a89ec..51f71af 100644
> --- a/src/storage/storage_backend_iscsi.c
> +++ b/src/storage/storage_backend_iscsi.c
> @@ -89,6 +89,27 @@ virStorageBackendISCSITargetIP(const char *hostname,
> return 0;
> }
>
> +static char *
> +virStorageBackendISCSIPortal(virStoragePoolSourcePtr source)
> +{
> + char ipaddr[NI_MAXHOST];
> + char *portal;
> +
> + if (virStorageBackendISCSITargetIP(source->host.name,
> + ipaddr, sizeof(ipaddr)) < 0)
> + return NULL;
> +
> + if (virAsprintf(&portal, "%s:%d,1", ipaddr,
> + source->host.port ?
> + source->host.port : 3260) < 0) {
> + virReportOOMError();
> + return NULL;
> + }
> +
> + return portal;
> +}
> +
> +
> static int
> virStorageBackendISCSIExtractSession(virStoragePoolObjPtr pool,
> char **const groups,
> @@ -156,7 +177,7 @@ virStorageBackendISCSISession(virStoragePoolObjPtr pool,
> #define LINE_SIZE 4096
>
> static int
> -virStorageBackendIQNFound(virStoragePoolObjPtr pool,
> +virStorageBackendIQNFound(const char *initiatoriqn,
> char **ifacename)
> {
> int ret = IQN_MISSING, fd = -1;
> @@ -182,7 +203,7 @@ virStorageBackendIQNFound(virStoragePoolObjPtr pool,
> if (virExec(prog, NULL, NULL, &child, -1, &fd, NULL, VIR_EXEC_NONE) < 0)
> {
> virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> _("Failed to run '%s' when looking for
> existing interface with IQN '%s'"),
> - prog[0], pool->def->source.initiator.iqn);
> + prog[0], initiatoriqn);
>
> ret = IQN_ERROR;
> goto out;
> @@ -215,7 +236,7 @@ virStorageBackendIQNFound(virStoragePoolObjPtr pool,
> }
> iqn++;
>
> - if (STREQ(iqn, pool->def->source.initiator.iqn)) {
> + if (STREQ(iqn, initiatoriqn)) {
> token = strtok_r(line, " ", &saveptr);
> *ifacename = strdup(token);
> if (*ifacename == NULL) {
> @@ -246,7 +267,7 @@ out:
>
>
> static int
> -virStorageBackendCreateIfaceIQN(virStoragePoolObjPtr pool,
> +virStorageBackendCreateIfaceIQN(const char *initiatoriqn,
> char **ifacename)
> {
> int ret = -1, exitstatus = -1;
> @@ -267,7 +288,7 @@ virStorageBackendCreateIfaceIQN(virStoragePoolObjPtr pool,
> };
>
> VIR_DEBUG("Attempting to create interface '%s' with IQN '%s'",
> - &temp_ifacename[0], pool->def->source.initiator.iqn);
> + &temp_ifacename[0], initiatoriqn);
>
> /* Note that we ignore the exitstatus. Older versions of iscsiadm
> * tools returned an exit status of > 0, even if they succeeded.
> @@ -283,7 +304,7 @@ virStorageBackendCreateIfaceIQN(virStoragePoolObjPtr pool,
> const char *const cmdargv2[] = {
> ISCSIADM, "--mode", "iface", "--interface", &temp_ifacename[0],
> "--op", "update", "--name", "iface.initiatorname", "--value",
> - pool->def->source.initiator.iqn, NULL
> + initiatoriqn, NULL
> };
>
> /* Note that we ignore the exitstatus. Older versions of iscsiadm tools
> @@ -292,19 +313,19 @@ virStorageBackendCreateIfaceIQN(virStoragePoolObjPtr
> pool,
> if (virRun(cmdargv2, &exitstatus) < 0) {
> virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> _("Failed to run command '%s' to update iscsi
> interface with IQN '%s'"),
> - cmdargv2[0], pool->def->source.initiator.iqn);
> + cmdargv2[0], initiatoriqn);
> goto out;
> }
>
> /* Check again to make sure the interface was created. */
> - if (virStorageBackendIQNFound(pool, ifacename) != IQN_FOUND) {
> + if (virStorageBackendIQNFound(initiatoriqn, ifacename) != IQN_FOUND) {
> VIR_DEBUG("Failed to find interface '%s' with IQN '%s' "
> "after attempting to create it",
> - &temp_ifacename[0], pool->def->source.initiator.iqn);
> + &temp_ifacename[0], initiatoriqn);
> goto out;
> } else {
> VIR_DEBUG("Interface '%s' with IQN '%s' was created successfully",
> - *ifacename, pool->def->source.initiator.iqn);
> + *ifacename, initiatoriqn);
> }
>
> ret = 0;
> @@ -316,82 +337,72 @@ out:
> }
>
>
> +
> static int
> -virStorageBackendISCSIConnectionIQN(virStoragePoolObjPtr pool,
> - const char *portal,
> - const char *action)
> +virStorageBackendISCSIConnection(const char *portal,
> + const char *initiatoriqn,
> + const char *target,
> + const char **extraargv)
> {
> int ret = -1;
> + const char *const baseargv[] = {
> + ISCSIADM,
> + "--mode", "node",
> + "--portal", portal,
> + "--targetname", target,
> + NULL
> + };
> + int i;
> + int nargs = 0;
> char *ifacename = NULL;
> + const char **cmdargv;
>
> - switch (virStorageBackendIQNFound(pool, &ifacename)) {
> - case IQN_FOUND:
> - VIR_DEBUG("ifacename: '%s'", ifacename);
> - break;
> - case IQN_MISSING:
> - if (virStorageBackendCreateIfaceIQN(pool, &ifacename) != 0) {
> - goto out;
> - }
> - break;
> - case IQN_ERROR:
> - default:
> - goto out;
> - }
> + for (i = 0 ; baseargv[i] != NULL ; i++)
> + nargs++;
> + for (i = 0 ; extraargv[i] != NULL ; i++)
> + nargs++;
> + if (initiatoriqn)
> + nargs += 2;
>
> - const char *const sendtargets[] = {
> - ISCSIADM, "--mode", "discovery", "--type", "sendtargets",
> "--portal", portal, NULL
> - };
> - if (virRun(sendtargets, NULL) < 0) {
> - virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> - _("Failed to run %s to get target list"),
> - sendtargets[0]);
> - goto out;
> + if (VIR_ALLOC_N(cmdargv, nargs+1) < 0) {
> + virReportOOMError();
> + return -1;
> }
>
> - const char *const cmdargv[] = {
> - ISCSIADM, "--mode", "node", "--portal", portal,
> - "--targetname", pool->def->source.devices[0].path, "--interface",
> - ifacename, action, NULL
> - };
> + nargs = 0;
> + for (i = 0 ; baseargv[i] != NULL ; i++)
> + cmdargv[nargs++] = baseargv[i];
> + for (i = 0 ; extraargv[i] != NULL ; i++)
> + cmdargv[nargs++] = extraargv[i];
>
> - if (virRun(cmdargv, NULL) < 0) {
> - virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> - _("Failed to run command '%s' with action
> '%s'"),
> - cmdargv[0], action);
> - goto out;
> + if (initiatoriqn) {
> + switch (virStorageBackendIQNFound(initiatoriqn, &ifacename)) {
> + case IQN_FOUND:
> + VIR_DEBUG("ifacename: '%s'", ifacename);
> + break;
> + case IQN_MISSING:
> + if (virStorageBackendCreateIfaceIQN(initiatoriqn, &ifacename) !=
> 0) {
> + goto cleanup;
> + }
> + break;
> + case IQN_ERROR:
> + default:
> + goto cleanup;
> + }
> +
> + cmdargv[nargs++] = "--interface";
> + cmdargv[nargs++] = ifacename;
> }
> + cmdargv[nargs++] = NULL;
> +
> + if (virRun(cmdargv, NULL) < 0)
> + goto cleanup;
>
> ret = 0;
>
> -out:
> +cleanup:
> + VIR_FREE(cmdargv);
> VIR_FREE(ifacename);
> - return ret;
> -}
> -
> -
> -static int
> -virStorageBackendISCSIConnection(virStoragePoolObjPtr pool,
> - const char *portal,
> - const char *action)
> -{
> - int ret = 0;
> -
> - if (pool->def->source.initiator.iqn != NULL) {
> -
> - ret = virStorageBackendISCSIConnectionIQN(pool, portal, action);
> -
> - } else {
> -
> - const char *const cmdargv[] = {
> - ISCSIADM, "--mode", "node", "--portal", portal,
> - "--targetname", pool->def->source.devices[0].path, action, NULL
> - };
> -
> - if (virRun(cmdargv, NULL) < 0) {
> - ret = -1;
> - }
> -
> - }
>
> return ret;
> }
> @@ -441,46 +452,18 @@ virStorageBackendISCSIRescanLUNs(virStoragePoolObjPtr
> pool ATTRIBUTE_UNUSED,
>
>
> static int
> -virStorageBackendISCSILogin(virStoragePoolObjPtr pool,
> - const char *portal)
> +virStorageBackendISCSIScanTargets(const char *portal)
> {
> - const char *const cmdsendtarget[] = {
> - ISCSIADM, "--mode", "discovery", "--type", "sendtargets",
> - "--portal", portal, NULL
> + const char *const sendtargets[] = {
> + ISCSIADM, "--mode", "discovery", "--type", "sendtargets",
> "--portal", portal, NULL
> };
> -
> - if (virRun(cmdsendtarget, NULL) < 0)
> + if (virRun(sendtargets, NULL) < 0) {
> + virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> + _("Failed to run %s to get target list"),
> + sendtargets[0]);
> return -1;
> -
> - return virStorageBackendISCSIConnection(pool, portal, "--login");
> -}
> -
> -static int
> -virStorageBackendISCSILogout(virStoragePoolObjPtr pool,
> - const char *portal)
> -{
> - return virStorageBackendISCSIConnection(pool, portal, "--logout");
> -}
> -
> -static char *
> -virStorageBackendISCSIPortal(virStoragePoolObjPtr pool)
> -{
> - char ipaddr[NI_MAXHOST];
> - char *portal;
> -
> - if (virStorageBackendISCSITargetIP(pool->def->source.host.name,
> - ipaddr, sizeof(ipaddr)) < 0)
> - return NULL;
> -
> - if (VIR_ALLOC_N(portal, strlen(ipaddr) + 1 + 4 + 2 + 1) < 0) {
> - virReportOOMError();
> - return NULL;
> }
> -
> - strcpy(portal, ipaddr);
> - strcat(portal, ":3260,1");
> -
> - return portal;
> + return 0;
> }
>
>
> @@ -489,7 +472,9 @@ virStorageBackendISCSIStartPool(virConnectPtr conn
> ATTRIBUTE_UNUSED,
> virStoragePoolObjPtr pool)
> {
> char *portal = NULL;
> - char *session;
> + char *session = NULL;
> + int ret = -1;
> + const char *loginargv[] = { "--login", NULL };
>
> if (pool->def->source.host.name == NULL) {
> virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> @@ -505,17 +490,26 @@ virStorageBackendISCSIStartPool(virConnectPtr conn
> ATTRIBUTE_UNUSED,
> }
>
> if ((session = virStorageBackendISCSISession(pool, 1)) == NULL) {
> - if ((portal = virStorageBackendISCSIPortal(pool)) == NULL)
> - return -1;
> - if (virStorageBackendISCSILogin(pool, portal) < 0) {
> - VIR_FREE(portal);
> - return -1;
> - }
> - VIR_FREE(portal);
> - } else {
> - VIR_FREE(session);
> + if ((portal = virStorageBackendISCSIPortal(&pool->def->source)) ==
> NULL)
> + goto cleanup;
> + /*
> + * iscsiadm doesn't let you login to a target, unless you've
> + * first issued a 'sendtargets' command to the portal :-(
> + */
> + if (virStorageBackendISCSIScanTargets(portal) < 0)
> + goto cleanup;
> +
> + if (virStorageBackendISCSIConnection(portal,
> + pool->def->source.initiator.iqn,
> +
> pool->def->source.devices[0].path,
> + loginargv) < 0)
> + goto cleanup;
> }
> - return 0;
> + ret = 0;
> +
> +cleanup:
> + VIR_FREE(session);
> + return ret;
> }
>
> static int
> @@ -546,18 +540,23 @@ static int
> virStorageBackendISCSIStopPool(virConnectPtr conn ATTRIBUTE_UNUSED,
> virStoragePoolObjPtr pool)
> {
> + const char *logoutargv[] = { "--logout", NULL };
> char *portal;
> + int ret = -1;
>
> - if ((portal = virStorageBackendISCSIPortal(pool)) == NULL)
> + if ((portal = virStorageBackendISCSIPortal(&pool->def->source)) == NULL)
> return -1;
>
> - if (virStorageBackendISCSILogout(pool, portal) < 0) {
> - VIR_FREE(portal);
> - return -1;
> - }
> - VIR_FREE(portal);
> + if (virStorageBackendISCSIConnection(portal,
> + pool->def->source.initiator.iqn,
> + pool->def->source.devices[0].path,
> + logoutargv) < 0)
> + goto cleanup;
> + ret = 0;
>
> - return 0;
> +cleanup:
> + VIR_FREE(portal);
> + return ret;
> }
>
> virStorageBackend virStorageBackendISCSI = {
> --
> 1.7.2.3
>
> --
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