/*
 * virstorageobj.c: internal storage pool and volume objects handling
 *                  (derived from storage_conf.c)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <dirent.h>

#include "datatypes.h"
#include "node_device_conf.h"
#include "virstorageobj.h"

#include "viralloc.h"
#include "virerror.h"
#include "virfile.h"
#include "virlog.h"
#include "virscsihost.h"
#include "virstring.h"
#include "virvhba.h"

#define VIR_FROM_THIS VIR_FROM_STORAGE

VIR_LOG_INIT("conf.virstorageobj");

static virClassPtr virStoragePoolObjClass;

static void
virStoragePoolObjDispose(void *opaque);


struct _virStorageVolDefList {
    size_t count;
    virStorageVolDefPtr *objs;
};

struct _virStoragePoolObj {
    virObjectLockable parent;

    char *configFile;
    char *autostartLink;
    bool active;
    bool autostart;
    unsigned int asyncjobs;

    virStoragePoolDefPtr def;
    virStoragePoolDefPtr newDef;

    virStorageVolDefList volumes;
};

struct _virStoragePoolObjList {
    size_t count;
    virStoragePoolObjPtr *objs;
};


static int
virStoragePoolObjOnceInit(void)
{
    if (!(virStoragePoolObjClass = virClassNew(virClassForObjectLockable(),
                                               "virStoragePoolObj",
                                               sizeof(virStoragePoolObj),
                                               virStoragePoolObjDispose)))
        return -1;

    return 0;
}

VIR_ONCE_GLOBAL_INIT(virStoragePoolObj)


virStoragePoolObjPtr
virStoragePoolObjNew(void)
{
    virStoragePoolObjPtr obj;

    if (virStoragePoolObjInitialize() < 0)
        return NULL;

    if (!(obj = virObjectLockableNew(virStoragePoolObjClass)))
        return NULL;

    virObjectLock(obj);
    obj->active = false;
    return obj;
}


void
virStoragePoolObjEndAPI(virStoragePoolObjPtr *obj)
{
    if (!*obj)
        return;

    virObjectUnlock(*obj);
    virObjectUnref(*obj);
    *obj = NULL;
}


virStoragePoolDefPtr
virStoragePoolObjGetDef(virStoragePoolObjPtr obj)
{
    return obj->def;
}


void
virStoragePoolObjSetDef(virStoragePoolObjPtr obj,
                        virStoragePoolDefPtr def)
{
    virStoragePoolDefFree(obj->def);
    obj->def = def;
}


virStoragePoolDefPtr
virStoragePoolObjGetNewDef(virStoragePoolObjPtr obj)
{
    return obj->newDef;
}


void
virStoragePoolObjDefUseNewDef(virStoragePoolObjPtr obj)
{
    virStoragePoolDefFree(obj->def);
    obj->def = obj->newDef;
    obj->newDef = NULL;
}


const char *
virStoragePoolObjGetConfigFile(virStoragePoolObjPtr obj)
{
    return obj->configFile;
}


void
virStoragePoolObjSetConfigFile(virStoragePoolObjPtr obj,
                               char *configFile)
{
    VIR_FREE(obj->configFile);
    obj->configFile = configFile;
}


const char *
virStoragePoolObjGetAutostartLink(virStoragePoolObjPtr obj)
{
    return obj->autostartLink;
}


bool
virStoragePoolObjIsActive(virStoragePoolObjPtr obj)
{
    return obj->active;
}


void
virStoragePoolObjSetActive(virStoragePoolObjPtr obj,
                           bool active)
{
    obj->active = active;
}


bool
virStoragePoolObjIsAutostart(virStoragePoolObjPtr obj)
{
    if (!obj->configFile)
        return 0;

    return obj->autostart;
}


void
virStoragePoolObjSetAutostart(virStoragePoolObjPtr obj,
                              bool autostart)
{
    obj->autostart = autostart;
}


unsigned int
virStoragePoolObjGetAsyncjobs(virStoragePoolObjPtr obj)
{
    return obj->asyncjobs;
}


void
virStoragePoolObjIncrAsyncjobs(virStoragePoolObjPtr obj)
{
    obj->asyncjobs++;
}


void
virStoragePoolObjDecrAsyncjobs(virStoragePoolObjPtr obj)
{
    obj->asyncjobs--;
}


void
virStoragePoolObjDispose(void *opaque)
{
    virStoragePoolObjPtr obj = opaque;

    if (!obj)
        return;

    virStoragePoolObjClearVols(obj);

    virStoragePoolDefFree(obj->def);
    virStoragePoolDefFree(obj->newDef);

    VIR_FREE(obj->configFile);
    VIR_FREE(obj->autostartLink);
}


void
virStoragePoolObjListFree(virStoragePoolObjListPtr pools)
{
    size_t i;
    for (i = 0; i < pools->count; i++)
        virObjectUnref(pools->objs[i]);
    VIR_FREE(pools->objs);
    VIR_FREE(pools);
}


virStoragePoolObjListPtr
virStoragePoolObjListNew(void)
{
    virStoragePoolObjListPtr pools;

    if (VIR_ALLOC(pools) < 0)
        return NULL;

    return pools;
}


/**
 * virStoragePoolObjListForEach
 * @pools: Pointer to pools object
 * @iter: Callback iteration helper
 * @opaque: Opaque data to use as argument to helper
 *
 * For each object in @pools, call the @iter helper using @opaque as
 * an argument.  This function doesn't care whether the @iter fails or
 * not as it's being used for Autostart and UpdateAllState callers
 * that want to iterate over all the @pools objects not stopping if
 * one happens to fail.
 */
void
virStoragePoolObjListForEach(virStoragePoolObjListPtr pools,
                             virStoragePoolObjListIterator iter,
                             const void *opaque)
{
    size_t i;
    virStoragePoolObjPtr obj;

    for (i = 0; i < pools->count; i++) {
        obj = pools->objs[i];
        virObjectLock(obj);
        iter(obj, opaque);
        virObjectUnlock(obj);
    }
}


/**
 * virStoragePoolObjListSearch
 * @pools: Pointer to pools object
 * @search: Callback searcher helper
 * @opaque: Opaque data to use as argument to helper
 *
 * Search through the @pools objects calling the @search helper using
 * the @opaque data in order to find an object that matches some criteria
 * and return that object locked.
 *
 * Returns a locked and reffed object when found and NULL when not found
 */
virStoragePoolObjPtr
virStoragePoolObjListSearch(virStoragePoolObjListPtr pools,
                            virStoragePoolObjListSearcher searcher,
                            const void *opaque)
{
    size_t i;
    virStoragePoolObjPtr obj;

    for (i = 0; i < pools->count; i++) {
        obj = pools->objs[i];
        virObjectLock(obj);
        if (searcher(obj, opaque))
            return virObjectRef(obj);
        virObjectUnlock(obj);
    }

    return NULL;
}


void
virStoragePoolObjRemove(virStoragePoolObjListPtr pools,
                        virStoragePoolObjPtr obj)
{
    size_t i;

    virObjectUnlock(obj);

    for (i = 0; i < pools->count; i++) {
        virObjectLock(pools->objs[i]);
        if (pools->objs[i] == obj) {
            virObjectUnlock(pools->objs[i]);
            virObjectUnref(pools->objs[i]);

            VIR_DELETE_ELEMENT(pools->objs, i, pools->count);
            break;
        }
        virObjectUnlock(pools->objs[i]);
    }
}


virStoragePoolObjPtr
virStoragePoolObjFindByUUID(virStoragePoolObjListPtr pools,
                            const unsigned char *uuid)
{
    size_t i;

    for (i = 0; i < pools->count; i++) {
        virStoragePoolObjPtr obj = pools->objs[i];

        virObjectLock(obj);
        if (!memcmp(obj->def->uuid, uuid, VIR_UUID_BUFLEN))
            return virObjectRef(obj);
        virObjectUnlock(obj);
    }

    return NULL;
}


virStoragePoolObjPtr
virStoragePoolObjFindByName(virStoragePoolObjListPtr pools,
                            const char *name)
{
    size_t i;

    for (i = 0; i < pools->count; i++) {
        virStoragePoolObjPtr obj = pools->objs[i];

        virObjectLock(obj);
        if (STREQ(obj->def->name, name))
            return virObjectRef(obj);
        virObjectUnlock(obj);
    }

    return NULL;
}


static virStoragePoolObjPtr
virStoragePoolSourceFindDuplicateDevices(virStoragePoolObjPtr obj,
                                         virStoragePoolDefPtr def)
{
    size_t i, j;

    for (i = 0; i < obj->def->source.ndevice; i++) {
        for (j = 0; j < def->source.ndevice; j++) {
            if (STREQ(obj->def->source.devices[i].path, def->source.devices[j].path))
                return obj;
        }
    }

    return NULL;
}


void
virStoragePoolObjClearVols(virStoragePoolObjPtr obj)
{
    size_t i;
    for (i = 0; i < obj->volumes.count; i++)
        virStorageVolDefFree(obj->volumes.objs[i]);

    VIR_FREE(obj->volumes.objs);
    obj->volumes.count = 0;
}


int
virStoragePoolObjAddVol(virStoragePoolObjPtr obj,
                        virStorageVolDefPtr voldef)
{
    if (VIR_APPEND_ELEMENT(obj->volumes.objs, obj->volumes.count, voldef) < 0)
        return -1;
    return 0;
}


void
virStoragePoolObjRemoveVol(virStoragePoolObjPtr obj,
                           virStorageVolDefPtr voldef)
{
    virStoragePoolDefPtr def = virStoragePoolObjGetDef(obj);
    size_t i;

    for (i = 0; i < obj->volumes.count; i++) {
        if (obj->volumes.objs[i] == voldef) {
            VIR_INFO("Deleting volume '%s' from storage pool '%s'",
                     voldef->name, def->name);
            virStorageVolDefFree(voldef);

            VIR_DELETE_ELEMENT(obj->volumes.objs, i, obj->volumes.count);
            return;
        }
    }
}


size_t
virStoragePoolObjGetVolumesCount(virStoragePoolObjPtr obj)
{
    return obj->volumes.count;
}


int
virStoragePoolObjForEachVolume(virStoragePoolObjPtr obj,
                               virStorageVolObjListIterator iter,
                               const void *opaque)
{
    size_t i;

    for (i = 0; i < obj->volumes.count; i++) {
        if (iter(obj->volumes.objs[i], opaque) < 0)
            return -1;
    }

    return 0;
}


virStorageVolDefPtr
virStoragePoolObjSearchVolume(virStoragePoolObjPtr obj,
                              virStorageVolObjListSearcher iter,
                              const void *opaque)
{
    size_t i;

    for (i = 0; i < obj->volumes.count; i++) {
        if (iter(obj->volumes.objs[i], opaque))
            return obj->volumes.objs[i];
    }

    return NULL;
}


virStorageVolDefPtr
virStorageVolDefFindByKey(virStoragePoolObjPtr obj,
                          const char *key)
{
    size_t i;

    for (i = 0; i < obj->volumes.count; i++)
        if (STREQ(obj->volumes.objs[i]->key, key))
            return obj->volumes.objs[i];

    return NULL;
}


virStorageVolDefPtr
virStorageVolDefFindByPath(virStoragePoolObjPtr obj,
                           const char *path)
{
    size_t i;

    for (i = 0; i < obj->volumes.count; i++)
        if (STREQ(obj->volumes.objs[i]->target.path, path))
            return obj->volumes.objs[i];

    return NULL;
}


virStorageVolDefPtr
virStorageVolDefFindByName(virStoragePoolObjPtr obj,
                           const char *name)
{
    size_t i;

    for (i = 0; i < obj->volumes.count; i++)
        if (STREQ(obj->volumes.objs[i]->name, name))
            return obj->volumes.objs[i];

    return NULL;
}


int
virStoragePoolObjNumOfVolumes(virStoragePoolObjPtr obj,
                              virConnectPtr conn,
                              virStoragePoolVolumeACLFilter filter)
{
    virStoragePoolDefPtr pooldef = obj->def;
    virStorageVolDefListPtr volumes = &obj->volumes;
    int nvolumes = 0;
    size_t i;

    for (i = 0; i < volumes->count; i++) {
        virStorageVolDefPtr def = volumes->objs[i];
        if (filter && !filter(conn, pooldef, def))
            continue;
        nvolumes++;
    }

    return nvolumes;
}


int
virStoragePoolObjVolumeGetNames(virStoragePoolObjPtr obj,
                                virConnectPtr conn,
                                virStoragePoolVolumeACLFilter filter,
                                char **const names,
                                int maxnames)
{
    virStoragePoolDefPtr pooldef = obj->def;
    virStorageVolDefListPtr volumes = &obj->volumes;
    int nnames = 0;
    size_t i;

    for (i = 0; i < volumes->count && nnames < maxnames; i++) {
        virStorageVolDefPtr def = volumes->objs[i];
        if (filter && !filter(conn, pooldef, def))
            continue;
        if (VIR_STRDUP(names[nnames], def->name) < 0)
            goto failure;
        nnames++;
    }

    return nnames;

 failure:
    while (--nnames >= 0)
        VIR_FREE(names[nnames]);

    return -1;
}


int
virStoragePoolObjVolumeListExport(virConnectPtr conn,
                                  virStoragePoolObjPtr obj,
                                  virStorageVolPtr **vols,
                                  virStoragePoolVolumeACLFilter filter)
{
    virStoragePoolDefPtr pooldef = obj->def;
    virStorageVolDefListPtr volumes = &obj->volumes;
    int ret = -1;
    size_t i;
    virStorageVolPtr *tmp_vols = NULL;
    virStorageVolPtr vol = NULL;
    int nvols = 0;

    /* Just returns the volumes count */
    if (!vols) {
        ret = volumes->count;
        goto cleanup;
    }

    if (VIR_ALLOC_N(tmp_vols, volumes->count + 1) < 0)
        goto cleanup;

    for (i = 0; i < volumes->count; i++) {
        virStorageVolDefPtr def = volumes->objs[i];
        if (filter && !filter(conn, pooldef, def))
            continue;
        if (!(vol = virGetStorageVol(conn, pooldef->name, def->name, def->key,
                                     NULL, NULL)))
            goto cleanup;
        tmp_vols[nvols++] = vol;
    }

    *vols = tmp_vols;
    tmp_vols = NULL;
    ret = nvols;

 cleanup:
    if (tmp_vols) {
        for (i = 0; i < nvols; i++)
            virObjectUnref(tmp_vols[i]);
        VIR_FREE(tmp_vols);
    }

    return ret;
}


virStoragePoolObjPtr
virStoragePoolObjAssignDef(virStoragePoolObjListPtr pools,
                           virStoragePoolDefPtr def)
{
    virStoragePoolObjPtr obj;

    if ((obj = virStoragePoolObjFindByName(pools, def->name))) {
        if (!virStoragePoolObjIsActive(obj)) {
            virStoragePoolDefFree(obj->def);
            obj->def = def;
        } else {
            virStoragePoolDefFree(obj->newDef);
            obj->newDef = def;
        }
        return obj;
    }

    if (!(obj = virStoragePoolObjNew()))
        return NULL;

    if (VIR_APPEND_ELEMENT_COPY(pools->objs, pools->count, obj) < 0) {
        virStoragePoolObjEndAPI(&obj);
        return NULL;
    }
    obj->def = def;

    return virObjectRef(obj);
}


static virStoragePoolObjPtr
virStoragePoolObjLoad(virStoragePoolObjListPtr pools,
                      const char *file,
                      const char *path,
                      const char *autostartLink)
{
    virStoragePoolDefPtr def;
    virStoragePoolObjPtr obj;

    if (!(def = virStoragePoolDefParseFile(path)))
        return NULL;

    if (!virFileMatchesNameSuffix(file, def->name, ".xml")) {
        virReportError(VIR_ERR_XML_ERROR,
                       _("Storage pool config filename '%s' does "
                         "not match pool name '%s'"),
                       path, def->name);
        virStoragePoolDefFree(def);
        return NULL;
    }

    if (!(obj = virStoragePoolObjAssignDef(pools, def))) {
        virStoragePoolDefFree(def);
        return NULL;
    }

    VIR_FREE(obj->configFile);  /* for driver reload */
    if (VIR_STRDUP(obj->configFile, path) < 0) {
        virStoragePoolObjRemove(pools, obj);
        return NULL;
    }
    VIR_FREE(obj->autostartLink); /* for driver reload */
    if (VIR_STRDUP(obj->autostartLink, autostartLink) < 0) {
        virStoragePoolObjRemove(pools, obj);
        return NULL;
    }

    obj->autostart = virFileLinkPointsTo(obj->autostartLink,
                                         obj->configFile);

    return obj;
}


static virStoragePoolObjPtr
virStoragePoolObjLoadState(virStoragePoolObjListPtr pools,
                           const char *stateDir,
                           const char *name)
{
    char *stateFile = NULL;
    virStoragePoolDefPtr def = NULL;
    virStoragePoolObjPtr obj = NULL;
    xmlDocPtr xml = NULL;
    xmlXPathContextPtr ctxt = NULL;
    xmlNodePtr node = NULL;

    if (!(stateFile = virFileBuildPath(stateDir, name, ".xml")))
        goto error;

    if (!(xml = virXMLParseCtxt(stateFile, NULL, _("(pool state)"), &ctxt)))
        goto error;

    if (!(node = virXPathNode("//pool", ctxt))) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Could not find any 'pool' element in state file"));
        goto error;
    }

    ctxt->node = node;
    if (!(def = virStoragePoolDefParseXML(ctxt)))
        goto error;

    if (STRNEQ(name, def->name)) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Storage pool state file '%s' does not match "
                         "pool name '%s'"),
                       stateFile, def->name);
        goto error;
    }

    /* create the object */
    if (!(obj = virStoragePoolObjAssignDef(pools, def)))
        goto error;

    /* XXX: future handling of some additional useful status data,
     * for now, if a status file for a pool exists, the pool will be marked
     * as active
     */

    obj->active = true;

 cleanup:
    VIR_FREE(stateFile);
    xmlFreeDoc(xml);
    xmlXPathFreeContext(ctxt);
    return obj;

 error:
    virStoragePoolDefFree(def);
    goto cleanup;
}


int
virStoragePoolObjLoadAllState(virStoragePoolObjListPtr pools,
                              const char *stateDir)
{
    DIR *dir;
    struct dirent *entry;
    int ret = -1;
    int rc;

    if ((rc = virDirOpenIfExists(&dir, stateDir)) <= 0)
        return rc;

    while ((ret = virDirRead(dir, &entry, stateDir)) > 0) {
        virStoragePoolObjPtr obj;

        if (!virFileStripSuffix(entry->d_name, ".xml"))
            continue;

        if (!(obj = virStoragePoolObjLoadState(pools, stateDir, entry->d_name)))
            continue;
        virStoragePoolObjEndAPI(&obj);
    }

    VIR_DIR_CLOSE(dir);
    return ret;
}


int
virStoragePoolObjLoadAllConfigs(virStoragePoolObjListPtr pools,
                                const char *configDir,
                                const char *autostartDir)
{
    DIR *dir;
    struct dirent *entry;
    int ret;
    int rc;

    if ((rc = virDirOpenIfExists(&dir, configDir)) <= 0)
        return rc;

    while ((ret = virDirRead(dir, &entry, configDir)) > 0) {
        char *path;
        char *autostartLink;
        virStoragePoolObjPtr obj;

        if (!virFileHasSuffix(entry->d_name, ".xml"))
            continue;

        if (!(path = virFileBuildPath(configDir, entry->d_name, NULL)))
            continue;

        if (!(autostartLink = virFileBuildPath(autostartDir, entry->d_name,
                                               NULL))) {
            VIR_FREE(path);
            continue;
        }

        obj = virStoragePoolObjLoad(pools, entry->d_name, path, autostartLink);
        virStoragePoolObjEndAPI(&obj);

        VIR_FREE(path);
        VIR_FREE(autostartLink);
    }

    VIR_DIR_CLOSE(dir);
    return ret;
}


int
virStoragePoolObjSaveDef(virStorageDriverStatePtr driver,
                         virStoragePoolObjPtr obj,
                         virStoragePoolDefPtr def)
{
    if (!obj->configFile) {
        if (virFileMakePath(driver->configDir) < 0) {
            virReportSystemError(errno,
                                 _("cannot create config directory %s"),
                                 driver->configDir);
            return -1;
        }

        if (!(obj->configFile = virFileBuildPath(driver->configDir,
                                                 def->name, ".xml"))) {
            return -1;
        }

        if (!(obj->autostartLink = virFileBuildPath(driver->autostartDir,
                                                    def->name, ".xml"))) {
            VIR_FREE(obj->configFile);
            return -1;
        }
    }

    return virStoragePoolSaveConfig(obj->configFile, def);
}


int
virStoragePoolObjDeleteDef(virStoragePoolObjPtr obj)
{
    if (!obj->configFile) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("no config file for %s"), obj->def->name);
        return -1;
    }

    if (unlink(obj->configFile) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("cannot remove config for %s"),
                       obj->def->name);
        return -1;
    }

    return 0;
}


int
virStoragePoolObjNumOfStoragePools(virStoragePoolObjListPtr pools,
                                   virConnectPtr conn,
                                   bool wantActive,
                                   virStoragePoolObjListACLFilter filter)
{
    int npools = 0;
    size_t i;

    for (i = 0; i < pools->count; i++) {
        virStoragePoolObjPtr obj = pools->objs[i];
        virObjectLock(obj);
        if (!filter || filter(conn, obj->def)) {
            if (wantActive == virStoragePoolObjIsActive(obj))
                npools++;
        }
        virObjectUnlock(obj);
    }

    return npools;
}


int
virStoragePoolObjGetNames(virStoragePoolObjListPtr pools,
                          virConnectPtr conn,
                          bool wantActive,
                          virStoragePoolObjListACLFilter filter,
                          char **const names,
                          int maxnames)
{
    int nnames = 0;
    size_t i;

    for (i = 0; i < pools->count && nnames < maxnames; i++) {
        virStoragePoolObjPtr obj = pools->objs[i];
        virObjectLock(obj);
        if (!filter || filter(conn, obj->def)) {
            if (wantActive == virStoragePoolObjIsActive(obj)) {
                if (VIR_STRDUP(names[nnames], obj->def->name) < 0) {
                    virObjectUnlock(obj);
                    goto failure;
                }
                nnames++;
            }
        }
        virObjectUnlock(obj);
    }

    return nnames;

 failure:
    while (--nnames >= 0)
        VIR_FREE(names[nnames]);

    return -1;
}


/*
 * virStoragePoolObjIsDuplicate:
 * @doms : virStoragePoolObjListPtr to search
 * @def  : virStoragePoolDefPtr definition of pool to lookup
 * @check_active: If true, ensure that pool is not active
 *
 * Returns: -1 on error
 *          0 if pool is new
 *          1 if pool is a duplicate
 */
int
virStoragePoolObjIsDuplicate(virStoragePoolObjListPtr pools,
                             virStoragePoolDefPtr def,
                             unsigned int check_active)
{
    int ret = -1;
    virStoragePoolObjPtr obj = NULL;

    /* See if a Pool with matching UUID already exists */
    obj = virStoragePoolObjFindByUUID(pools, def->uuid);
    if (obj) {
        /* UUID matches, but if names don't match, refuse it */
        if (STRNEQ(obj->def->name, def->name)) {
            char uuidstr[VIR_UUID_STRING_BUFLEN];
            virUUIDFormat(obj->def->uuid, uuidstr);
            virReportError(VIR_ERR_OPERATION_FAILED,
                           _("pool '%s' is already defined with uuid %s"),
                           obj->def->name, uuidstr);
            goto cleanup;
        }

        if (check_active) {
            /* UUID & name match, but if Pool is already active, refuse it */
            if (virStoragePoolObjIsActive(obj)) {
                virReportError(VIR_ERR_OPERATION_INVALID,
                               _("pool is already active as '%s'"),
                               obj->def->name);
                goto cleanup;
            }
        }

        ret = 1;
    } else {
        /* UUID does not match, but if a name matches, refuse it */
        obj = virStoragePoolObjFindByName(pools, def->name);
        if (obj) {
            char uuidstr[VIR_UUID_STRING_BUFLEN];
            virUUIDFormat(obj->def->uuid, uuidstr);
            virReportError(VIR_ERR_OPERATION_FAILED,
                           _("pool '%s' already exists with uuid %s"),
                           def->name, uuidstr);
            goto cleanup;
        }
        ret = 0;
    }

 cleanup:
    virStoragePoolObjEndAPI(&obj);
    return ret;
}


static int
getSCSIHostNumber(virStorageAdapterSCSIHostPtr scsi_host,
                  unsigned int *hostnum)
{
    int ret = -1;
    unsigned int num;
    char *name = NULL;

    if (scsi_host->has_parent) {
        virPCIDeviceAddressPtr addr = &scsi_host->parentaddr;
        unsigned int unique_id = scsi_host->unique_id;

        if (!(name = virSCSIHostGetNameByParentaddr(addr->domain,
                                                    addr->bus,
                                                    addr->slot,
                                                    addr->function,
                                                    unique_id)))
            goto cleanup;
        if (virSCSIHostGetNumber(name, &num) < 0)
            goto cleanup;
    } else {
        if (virSCSIHostGetNumber(scsi_host->name, &num) < 0)
            goto cleanup;
    }

    *hostnum = num;
    ret = 0;

 cleanup:
    VIR_FREE(name);
    return ret;
}


static bool
virStorageIsSameHostnum(const char *name,
                        unsigned int scsi_hostnum)
{
    unsigned int fc_hostnum;

    if (virSCSIHostGetNumber(name, &fc_hostnum) == 0 &&
        scsi_hostnum == fc_hostnum)
        return true;

    return false;
}


/*
 * matchFCHostToSCSIHost:
 *
 * @conn: Connection pointer
 * @fchost: fc_host adapter ptr (either def or pool->def)
 * @scsi_hostnum: Already determined "scsi_pool" hostnum
 *
 * Returns true/false whether there is a match between the incoming
 *         fc_adapter host# and the scsi_host host#
 */
static bool
matchFCHostToSCSIHost(virConnectPtr conn,
                      virStorageAdapterFCHostPtr fchost,
                      unsigned int scsi_hostnum)
{
    bool ret = false;
    char *name = NULL;
    char *scsi_host_name = NULL;
    char *parent_name = NULL;

    /* If we have a parent defined, get its hostnum, and compare to the
     * scsi_hostnum. If they are the same, then we have a match
     */
    if (fchost->parent &&
        virStorageIsSameHostnum(fchost->parent, scsi_hostnum))
        return true;

    /* If we find an fc adapter name, then either libvirt created a vHBA
     * for this fc_host or a 'virsh nodedev-create' generated a vHBA.
     */
    if ((name = virVHBAGetHostByWWN(NULL, fchost->wwnn, fchost->wwpn))) {

        /* Get the scsi_hostN for the vHBA in order to see if it
         * matches our scsi_hostnum
         */
        if (virStorageIsSameHostnum(name, scsi_hostnum)) {
            ret = true;
            goto cleanup;
        }

        /* We weren't provided a parent, so we have to query the node
         * device driver in order to ascertain the parent of the vHBA.
         * If the parent fc_hostnum is the same as the scsi_hostnum, we
         * have a match.
         */
        if (conn && !fchost->parent) {
            if (virAsprintf(&scsi_host_name, "scsi_%s", name) < 0)
                goto cleanup;
            if ((parent_name = virNodeDeviceGetParentName(conn,
                                                          scsi_host_name))) {
                if (virStorageIsSameHostnum(parent_name, scsi_hostnum)) {
                    ret = true;
                    goto cleanup;
                }
            } else {
                /* Throw away the error and fall through */
                virResetLastError();
                VIR_DEBUG("Could not determine parent vHBA");
            }
        }
    }

    /* NB: Lack of a name means that this vHBA hasn't yet been created,
     *     which means our scsi_host cannot be using the vHBA. Furthermore,
     *     lack of a provided parent means libvirt is going to choose the
     *     "best" fc_host capable adapter based on availabilty. That could
     *     conflict with an existing scsi_host definition, but there's no
     *     way to know that now.
     */

 cleanup:
    VIR_FREE(name);
    VIR_FREE(parent_name);
    VIR_FREE(scsi_host_name);
    return ret;
}


static bool
matchSCSIAdapterParent(virStorageAdapterSCSIHostPtr pool_scsi_host,
                       virStorageAdapterSCSIHostPtr def_scsi_host)
{
    virPCIDeviceAddressPtr pooladdr = &pool_scsi_host->parentaddr;
    virPCIDeviceAddressPtr defaddr = &def_scsi_host->parentaddr;

    if (pooladdr->domain == defaddr->domain &&
        pooladdr->bus == defaddr->bus &&
        pooladdr->slot == defaddr->slot &&
        pooladdr->function == defaddr->function &&
        pool_scsi_host->unique_id == def_scsi_host->unique_id)
        return true;

    return false;
}


static bool
virStoragePoolSourceMatchSingleHost(virStoragePoolSourcePtr poolsrc,
                                    virStoragePoolSourcePtr defsrc)
{
    if (poolsrc->nhost != 1 && defsrc->nhost != 1)
        return false;

    if (defsrc->hosts[0].port &&
        poolsrc->hosts[0].port != defsrc->hosts[0].port)
        return false;

    return STREQ(poolsrc->hosts[0].name, defsrc->hosts[0].name);
}


static bool
virStoragePoolSourceISCSIMatch(virStoragePoolObjPtr obj,
                               virStoragePoolDefPtr def)
{
    virStoragePoolSourcePtr poolsrc = &obj->def->source;
    virStoragePoolSourcePtr defsrc = &def->source;

    /* NB: Do not check the source host name */
    if (STRNEQ_NULLABLE(poolsrc->initiator.iqn, defsrc->initiator.iqn))
        return false;

    return true;
}


static virStoragePoolObjPtr
virStoragePoolObjSourceMatchTypeDIR(virStoragePoolObjPtr obj,
                                    virStoragePoolDefPtr def)
{
    if (obj->def->type == VIR_STORAGE_POOL_DIR) {
        if (STREQ(obj->def->target.path, def->target.path))
            return obj;
    } else if (obj->def->type == VIR_STORAGE_POOL_GLUSTER) {
        if (STREQ(obj->def->source.name, def->source.name) &&
            STREQ_NULLABLE(obj->def->source.dir, def->source.dir) &&
            virStoragePoolSourceMatchSingleHost(&obj->def->source,
                                                &def->source))
            return obj;
    } else if (obj->def->type == VIR_STORAGE_POOL_NETFS) {
        if (STREQ(obj->def->source.dir, def->source.dir) &&
            virStoragePoolSourceMatchSingleHost(&obj->def->source,
                                                &def->source))
            return obj;
    }

    return NULL;
}


static virStoragePoolObjPtr
virStoragePoolObjSourceMatchTypeISCSI(virStoragePoolObjPtr obj,
                                      virStoragePoolDefPtr def,
                                      virConnectPtr conn)
{
    virStorageAdapterPtr pool_adapter = &obj->def->source.adapter;
    virStorageAdapterPtr def_adapter = &def->source.adapter;
    virStorageAdapterSCSIHostPtr pool_scsi_host;
    virStorageAdapterSCSIHostPtr def_scsi_host;
    virStorageAdapterFCHostPtr pool_fchost;
    virStorageAdapterFCHostPtr def_fchost;
    unsigned int pool_hostnum;
    unsigned int def_hostnum;
    unsigned int scsi_hostnum;

    if (pool_adapter->type == VIR_STORAGE_ADAPTER_TYPE_FC_HOST &&
        def_adapter->type == VIR_STORAGE_ADAPTER_TYPE_FC_HOST) {
        pool_fchost = &pool_adapter->data.fchost;
        def_fchost = &def_adapter->data.fchost;

        if (STREQ(pool_fchost->wwnn, def_fchost->wwnn) &&
            STREQ(pool_fchost->wwpn, def_fchost->wwpn))
            return obj;
    } else if (pool_adapter->type == VIR_STORAGE_ADAPTER_TYPE_SCSI_HOST &&
               def_adapter->type == VIR_STORAGE_ADAPTER_TYPE_SCSI_HOST) {
        pool_scsi_host = &pool_adapter->data.scsi_host;
        def_scsi_host = &def_adapter->data.scsi_host;

        if (pool_scsi_host->has_parent &&
            def_scsi_host->has_parent &&
            matchSCSIAdapterParent(pool_scsi_host, def_scsi_host))
            return obj;

        if (getSCSIHostNumber(pool_scsi_host, &pool_hostnum) < 0 ||
            getSCSIHostNumber(def_scsi_host, &def_hostnum) < 0)
            return NULL;
        if (pool_hostnum == def_hostnum)
            return obj;
    } else if (pool_adapter->type == VIR_STORAGE_ADAPTER_TYPE_FC_HOST &&
               def_adapter->type == VIR_STORAGE_ADAPTER_TYPE_SCSI_HOST) {
        pool_fchost = &pool_adapter->data.fchost;
        def_scsi_host = &def_adapter->data.scsi_host;

        /* Get the scsi_hostN for the scsi_host source adapter def */
        if (getSCSIHostNumber(def_scsi_host, &scsi_hostnum) < 0)
            return NULL;

        if (matchFCHostToSCSIHost(conn, pool_fchost, scsi_hostnum))
            return obj;

    } else if (pool_adapter->type == VIR_STORAGE_ADAPTER_TYPE_SCSI_HOST &&
               def_adapter->type == VIR_STORAGE_ADAPTER_TYPE_FC_HOST) {
        pool_scsi_host = &pool_adapter->data.scsi_host;
        def_fchost = &def_adapter->data.fchost;

        if (getSCSIHostNumber(pool_scsi_host, &scsi_hostnum) < 0)
            return NULL;

        if (matchFCHostToSCSIHost(conn, def_fchost, scsi_hostnum))
            return obj;
    }

    return NULL;
}


static virStoragePoolObjPtr
virStoragePoolObjSourceMatchTypeDEVICE(virStoragePoolObjPtr obj,
                                       virStoragePoolDefPtr def)
{
    virStoragePoolObjPtr matchobj = NULL;

    if (obj->def->type == VIR_STORAGE_POOL_ISCSI) {
        if (def->type != VIR_STORAGE_POOL_ISCSI)
            return NULL;

        if ((matchobj = virStoragePoolSourceFindDuplicateDevices(obj, def))) {
            if (!virStoragePoolSourceISCSIMatch(matchobj, def))
                return NULL;
        }
        return matchobj;
    }

    if (def->type == VIR_STORAGE_POOL_ISCSI)
        return NULL;

    /* VIR_STORAGE_POOL_FS
     * VIR_STORAGE_POOL_LOGICAL
     * VIR_STORAGE_POOL_DISK
     * VIR_STORAGE_POOL_ZFS */
    return virStoragePoolSourceFindDuplicateDevices(obj, def);
}


int
virStoragePoolObjSourceFindDuplicate(virConnectPtr conn,
                                     virStoragePoolObjListPtr pools,
                                     virStoragePoolDefPtr def)
{
    size_t i;
    int ret = 1;
    virStoragePoolObjPtr obj = NULL;
    virStoragePoolObjPtr matchobj = NULL;

    /* Check the pool list for duplicate underlying storage */
    for (i = 0; i < pools->count; i++) {
        obj = pools->objs[i];

        /* Don't match against ourself if re-defining existing pool ! */
        if (STREQ(obj->def->name, def->name))
            continue;

        virObjectLock(obj);

        switch ((virStoragePoolType)obj->def->type) {
        case VIR_STORAGE_POOL_DIR:
        case VIR_STORAGE_POOL_GLUSTER:
        case VIR_STORAGE_POOL_NETFS:
            if (def->type == obj->def->type)
                matchobj = virStoragePoolObjSourceMatchTypeDIR(obj, def);
            break;

        case VIR_STORAGE_POOL_SCSI:
            if (def->type == obj->def->type)
                matchobj = virStoragePoolObjSourceMatchTypeISCSI(obj, def,
                                                                  conn);
            break;

        case VIR_STORAGE_POOL_ISCSI:
        case VIR_STORAGE_POOL_FS:
        case VIR_STORAGE_POOL_LOGICAL:
        case VIR_STORAGE_POOL_DISK:
        case VIR_STORAGE_POOL_ZFS:
            if (def->type == VIR_STORAGE_POOL_ISCSI ||
                def->type == VIR_STORAGE_POOL_FS ||
                def->type == VIR_STORAGE_POOL_LOGICAL ||
                def->type == VIR_STORAGE_POOL_DISK ||
                def->type == VIR_STORAGE_POOL_ZFS)
                matchobj = virStoragePoolObjSourceMatchTypeDEVICE(obj, def);
            break;

        case VIR_STORAGE_POOL_SHEEPDOG:
            if (def->type == obj->def->type &&
                virStoragePoolSourceMatchSingleHost(&obj->def->source,
                                                    &def->source))
                matchobj = obj;
            break;

        case VIR_STORAGE_POOL_MPATH:
            /* Only one mpath pool is valid per host */
            if (def->type == obj->def->type)
                matchobj = obj;
            break;

        case VIR_STORAGE_POOL_VSTORAGE:
            if (def->type == obj->def->type &&
                STREQ(obj->def->source.name, def->source.name))
                matchobj = obj;
            break;

        case VIR_STORAGE_POOL_RBD:
        case VIR_STORAGE_POOL_LAST:
            break;
        }
        virObjectUnlock(obj);

        if (matchobj)
            break;
    }

    if (matchobj) {
        virReportError(VIR_ERR_OPERATION_FAILED,
                       _("Storage source conflict with pool: '%s'"),
                       matchobj->def->name);
        ret = -1;
    }
    return ret;
}


#define MATCH(FLAG) (flags & (FLAG))
static bool
virStoragePoolMatch(virStoragePoolObjPtr obj,
                    unsigned int flags)
{
    /* filter by active state */
    if (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_FILTERS_ACTIVE) &&
        !((MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_ACTIVE) &&
           virStoragePoolObjIsActive(obj)) ||
          (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_INACTIVE) &&
           !virStoragePoolObjIsActive(obj))))
        return false;

    /* filter by persistence */
    if (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_FILTERS_PERSISTENT) &&
        !((MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_PERSISTENT) &&
           obj->configFile) ||
          (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_TRANSIENT) &&
           !obj->configFile)))
        return false;

    /* filter by autostart option */
    if (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_FILTERS_AUTOSTART) &&
        !((MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_AUTOSTART) &&
           obj->autostart) ||
          (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_NO_AUTOSTART) &&
           !obj->autostart)))
        return false;

    /* filter by pool type */
    if (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_FILTERS_POOL_TYPE)) {
        if (!((MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_DIR) &&
               (obj->def->type == VIR_STORAGE_POOL_DIR))     ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_FS) &&
               (obj->def->type == VIR_STORAGE_POOL_FS))      ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_NETFS) &&
               (obj->def->type == VIR_STORAGE_POOL_NETFS))   ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_LOGICAL) &&
               (obj->def->type == VIR_STORAGE_POOL_LOGICAL)) ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_DISK) &&
               (obj->def->type == VIR_STORAGE_POOL_DISK))    ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_ISCSI) &&
               (obj->def->type == VIR_STORAGE_POOL_ISCSI))   ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_SCSI) &&
               (obj->def->type == VIR_STORAGE_POOL_SCSI))    ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_MPATH) &&
               (obj->def->type == VIR_STORAGE_POOL_MPATH))   ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_RBD) &&
               (obj->def->type == VIR_STORAGE_POOL_RBD))     ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_SHEEPDOG) &&
               (obj->def->type == VIR_STORAGE_POOL_SHEEPDOG)) ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_GLUSTER) &&
               (obj->def->type == VIR_STORAGE_POOL_GLUSTER)) ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_ZFS) &&
               (obj->def->type == VIR_STORAGE_POOL_ZFS))     ||
              (MATCH(VIR_CONNECT_LIST_STORAGE_POOLS_VSTORAGE) &&
               (obj->def->type == VIR_STORAGE_POOL_VSTORAGE))))
            return false;
    }

    return true;
}
#undef MATCH


int
virStoragePoolObjListExport(virConnectPtr conn,
                            virStoragePoolObjListPtr poolobjs,
                            virStoragePoolPtr **pools,
                            virStoragePoolObjListFilter filter,
                            unsigned int flags)
{
    virStoragePoolPtr *tmp_pools = NULL;
    virStoragePoolPtr pool = NULL;
    int npools = 0;
    int ret = -1;
    size_t i;

    if (pools && VIR_ALLOC_N(tmp_pools, poolobjs->count + 1) < 0)
        goto cleanup;

    for (i = 0; i < poolobjs->count; i++) {
        virStoragePoolObjPtr obj = poolobjs->objs[i];
        virObjectLock(obj);
        if ((!filter || filter(conn, obj->def)) &&
            virStoragePoolMatch(obj, flags)) {
            if (pools) {
                if (!(pool = virGetStoragePool(conn,
                                               obj->def->name,
                                               obj->def->uuid,
                                               NULL, NULL))) {
                    virObjectUnlock(obj);
                    goto cleanup;
                }
                tmp_pools[npools] = pool;
            }
            npools++;
        }
        virObjectUnlock(obj);
    }

    if (tmp_pools) {
        /* trim the array to the final size */
        ignore_value(VIR_REALLOC_N(tmp_pools, npools + 1));
        *pools = tmp_pools;
        tmp_pools = NULL;
    }

    ret = npools;

 cleanup:
    if (tmp_pools) {
        for (i = 0; i < npools; i++)
            virObjectUnref(tmp_pools[i]);
    }

    VIR_FREE(tmp_pools);
    return ret;
}