<commit_before>/*
 * storage_backend_fs.c: storage backend for FS and directory handling
 *
 * Copyright (C) 2007-2014 Red Hat, Inc.
 * Copyright (C) 2007-2008 <NAME>
 *
 * 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/>.
 *
 * Author: <NAME> <<EMAIL>>
 */

#include <config.h>

#include <sys/statvfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>

#if WITH_BLKID
# include <blkid/blkid.h>
#endif

#include "virerror.h"
#include "storage_backend_fs.h"
#include "storage_conf.h"
#include "virstoragefile.h"
#include "vircommand.h"
#include "viralloc.h"
#include "virxml.h"
#include "virfile.h"
#include "virlog.h"
#include "virstring.h"

#define VIR_FROM_THIS VIR_FROM_STORAGE

VIR_LOG_INIT("storage.storage_backend_fs");

#define VIR_STORAGE_VOL_FS_OPEN_FLAGS    (VIR_STORAGE_VOL_OPEN_DEFAULT | \
                                          VIR_STORAGE_VOL_OPEN_DIR)
#define VIR_STORAGE_VOL_FS_PROBE_FLAGS   (VIR_STORAGE_VOL_FS_OPEN_FLAGS | \
                                          VIR_STORAGE_VOL_OPEN_NOERROR)

static int
virStorageBackendProbeTarget(virStorageSourcePtr target,
                             virStorageEncryptionPtr *encryption)
{
    int backingStoreFormat;
    int fd = -1;
    int ret = -1;
    int rc;
    virStorageSourcePtr meta = NULL;
    struct stat sb;

    if (encryption)
        *encryption = NULL;

    if ((rc = virStorageBackendVolOpen(target->path, &sb,
                                       VIR_STORAGE_VOL_FS_PROBE_FLAGS)) < 0)
        return rc; /* Take care to propagate rc, it is not always -1 */
    fd = rc;

    if (virStorageBackendUpdateVolTargetInfoFD(target, fd, &sb, true) < 0)
        goto cleanup;

    if (S_ISDIR(sb.st_mode)) {
        target->format = VIR_STORAGE_FILE_DIR;
        ret = 0;
        goto cleanup;
    }

    if (!(meta = virStorageFileGetMetadataFromFD(target->path,
                                                 fd,
                                                 VIR_STORAGE_FILE_AUTO,
                                                 &backingStoreFormat)))
        goto cleanup;

    if (meta->backingStoreRaw) {
        if (VIR_ALLOC(target->backingStore) < 0)
            goto cleanup;

        target->backingStore->path = meta->backingStoreRaw;
        meta->backingStoreRaw = NULL;
        target->backingStore->format = backingStoreFormat;

        if (target->backingStore->format == VIR_STORAGE_FILE_AUTO) {
            if (!virStorageIsFile(target->backingStore->path) ||
                (rc = virStorageFileProbeFormat(target->backingStore->path,
                                                -1, -1)) < 0) {
                /* If the backing file is currently unavailable or is
                 * accessed via remote protocol only log an error, fake the
                 * format as RAW and continue. Returning -1 here would
                 * disable the whole storage pool, making it unavailable for
                 * even maintenance. */
                target->backingStore->format = VIR_STORAGE_FILE_RAW;
                virReportError(VIR_ERR_INTERNAL_ERROR,
                               _("cannot probe backing volume format: %s"),
                               target->backingStore->path);
                ret = -3;
            } else {
                target->backingStore->format = rc;
            }
        }
    }

    target->format = meta->format;
<commit_msg>storage: fs: Properly parse backing store info<commit_after>/*
 * storage_backend_fs.c: storage backend for FS and directory handling
 *
 * Copyright (C) 2007-2014 Red Hat, Inc.
 * Copyright (C) 2007-2008 <NAME>
 *
 * 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/>.
 *
 * Author: <NAME> <<EMAIL>>
 */

#include <config.h>

#include <sys/statvfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>

#if WITH_BLKID
# include <blkid/blkid.h>
#endif

#include "virerror.h"
#include "storage_backend_fs.h"
#include "storage_conf.h"
#include "virstoragefile.h"
#include "vircommand.h"
#include "viralloc.h"
#include "virxml.h"
#include "virfile.h"
#include "virlog.h"
#include "virstring.h"

#define VIR_FROM_THIS VIR_FROM_STORAGE

VIR_LOG_INIT("storage.storage_backend_fs");

#define VIR_STORAGE_VOL_FS_OPEN_FLAGS    (VIR_STORAGE_VOL_OPEN_DEFAULT | \
                                          VIR_STORAGE_VOL_OPEN_DIR)
#define VIR_STORAGE_VOL_FS_PROBE_FLAGS   (VIR_STORAGE_VOL_FS_OPEN_FLAGS | \
                                          VIR_STORAGE_VOL_OPEN_NOERROR)

static int
virStorageBackendProbeTarget(virStorageSourcePtr target,
                             virStorageEncryptionPtr *encryption)
{
    int backingStoreFormat;
    int fd = -1;
    int ret = -1;
    int rc;
    virStorageSourcePtr meta = NULL;
    struct stat sb;

    if (encryption)
        *encryption = NULL;

    if ((rc = virStorageBackendVolOpen(target->path, &sb,
                                       VIR_STORAGE_VOL_FS_PROBE_FLAGS)) < 0)
        return rc; /* Take care to propagate rc, it is not always -1 */
    fd = rc;

    if (virStorageBackendUpdateVolTargetInfoFD(target, fd, &sb, true) < 0)
        goto cleanup;

    if (S_ISDIR(sb.st_mode)) {
        target->format = VIR_STORAGE_FILE_DIR;
        ret = 0;
        goto cleanup;
    }

    if (!(meta = virStorageFileGetMetadataFromFD(target->path,
                                                 fd,
                                                 VIR_STORAGE_FILE_AUTO,
                                                 &backingStoreFormat)))
        goto cleanup;

    if (meta->backingStoreRaw) {
        if (!(target->backingStore = virStorageSourceNewFromBacking(meta)))
            goto cleanup;

        target->backingStore->format = backingStoreFormat;

        /* XXX: Remote storage doesn't play nicely with volumes backed by
         * remote storage. To avoid trouble, just fake the backing store is RAW
         * and put the string from the metadata as the path of the target. */
        if (!virStorageSourceIsLocalStorage(target->backingStore)) {
            virStorageSourceFree(target->backingStore);

            if (VIR_ALLOC(target->backingStore) < 0)
                goto cleanup;

            target->backingStore->type = VIR_STORAGE_TYPE_NETWORK;
            target->backingStore->path = meta->backingStoreRaw;
            meta->backingStoreRaw = NULL;
            target->backingStore->format = VIR_STORAGE_FILE_RAW;
        }

        if (target->backingStore->format == VIR_STORAGE_FILE_AUTO) {
            if ((rc = virStorageFileProbeFormat(target->backingStore->path,
                                                -1, -1)) < 0) {
                /* If the backing file is currently unavailable or is
                 * accessed via remote protocol only log an error, fake the
                 * format as RAW and continue. Returning -1 here would
                 * disable the whole storage pool, making it unavailable for
                 * even maintenance. */
                target->backingStore->format = VIR_STORAGE_FILE_RAW;
                virReportError(VIR_ERR_INTERNAL_ERROR,
                               _("cannot probe backing volume format: %s"),
                               target->backingStore->path);
                ret = -3;
            } else {
                target->backingStore->format = rc;
            }
        }
    }

    target->format = meta->format;

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