Ejemplo n.º 1
0
Archivo: dmg.c Proyecto: 8tab/qemu
static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
                    Error **errp)
{
    BDRVDMGState *s = bs->opaque;
    DmgHeaderState ds;
    uint64_t rsrc_fork_offset, rsrc_fork_length;
    uint64_t plist_xml_offset, plist_xml_length;
    int64_t offset;
    int ret;

    bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
                               false, errp);
    if (!bs->file) {
        return -EINVAL;
    }

    ret = bdrv_set_read_only(bs, true, errp);
    if (ret < 0) {
        return ret;
    }

    block_module_load_one("dmg-bz2");

    s->n_chunks = 0;
    s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
    /* used by dmg_read_mish_block to keep track of the current I/O position */
    ds.data_fork_offset = 0;
    ds.max_compressed_size = 1;
    ds.max_sectors_per_chunk = 1;

    /* locate the UDIF trailer */
    offset = dmg_find_koly_offset(bs->file, errp);
    if (offset < 0) {
        ret = offset;
        goto fail;
    }

    /* offset of data fork (DataForkOffset) */
    ret = read_uint64(bs, offset + 0x18, &ds.data_fork_offset);
    if (ret < 0) {
        goto fail;
    } else if (ds.data_fork_offset > offset) {
        ret = -EINVAL;
        goto fail;
    }

    /* offset of resource fork (RsrcForkOffset) */
    ret = read_uint64(bs, offset + 0x28, &rsrc_fork_offset);
    if (ret < 0) {
        goto fail;
    }
    ret = read_uint64(bs, offset + 0x30, &rsrc_fork_length);
    if (ret < 0) {
        goto fail;
    }
    if (rsrc_fork_offset >= offset ||
        rsrc_fork_length > offset - rsrc_fork_offset) {
        ret = -EINVAL;
        goto fail;
    }
    /* offset of property list (XMLOffset) */
    ret = read_uint64(bs, offset + 0xd8, &plist_xml_offset);
    if (ret < 0) {
        goto fail;
    }
    ret = read_uint64(bs, offset + 0xe0, &plist_xml_length);
    if (ret < 0) {
        goto fail;
    }
    if (plist_xml_offset >= offset ||
        plist_xml_length > offset - plist_xml_offset) {
        ret = -EINVAL;
        goto fail;
    }
    ret = read_uint64(bs, offset + 0x1ec, (uint64_t *)&bs->total_sectors);
    if (ret < 0) {
        goto fail;
    }
    if (bs->total_sectors < 0) {
        ret = -EINVAL;
        goto fail;
    }
    if (rsrc_fork_length != 0) {
        ret = dmg_read_resource_fork(bs, &ds,
                                     rsrc_fork_offset, rsrc_fork_length);
        if (ret < 0) {
            goto fail;
        }
    } else if (plist_xml_length != 0) {
        ret = dmg_read_plist_xml(bs, &ds, plist_xml_offset, plist_xml_length);
        if (ret < 0) {
            goto fail;
        }
    } else {
        ret = -EINVAL;
        goto fail;
    }

    /* initialize zlib engine */
    s->compressed_chunk = qemu_try_blockalign(bs->file->bs,
                                              ds.max_compressed_size + 1);
    s->uncompressed_chunk = qemu_try_blockalign(bs->file->bs,
                                                512 * ds.max_sectors_per_chunk);
    if (s->compressed_chunk == NULL || s->uncompressed_chunk == NULL) {
        ret = -ENOMEM;
        goto fail;
    }

    if (inflateInit(&s->zstream) != Z_OK) {
        ret = -EINVAL;
        goto fail;
    }

    s->current_chunk = s->n_chunks;

    qemu_co_mutex_init(&s->lock);
    return 0;

fail:
    g_free(s->types);
    g_free(s->offsets);
    g_free(s->lengths);
    g_free(s->sectors);
    g_free(s->sectorcounts);
    qemu_vfree(s->compressed_chunk);
    qemu_vfree(s->uncompressed_chunk);
    return ret;
}
Ejemplo n.º 2
0
Archivo: rbd.c Proyecto: nikunjad/qemu
static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
                         Error **errp)
{
    BDRVRBDState *s = bs->opaque;
    const char *pool, *snap, *conf, *user, *image_name, *keypairs;
    const char *secretid, *filename;
    QemuOpts *opts;
    Error *local_err = NULL;
    char *mon_host = NULL;
    int r;

    /* If we are given a filename, parse the filename, with precedence given to
     * filename encoded options */
    filename = qdict_get_try_str(options, "filename");
    if (filename) {
        warn_report("'filename' option specified. "
                    "This is an unsupported option, and may be deprecated "
                    "in the future");
        qemu_rbd_parse_filename(filename, options, &local_err);
        if (local_err) {
            r = -EINVAL;
            error_propagate(errp, local_err);
            goto exit;
        }
    }

    opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
    qemu_opts_absorb_qdict(opts, options, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        r = -EINVAL;
        goto failed_opts;
    }

    mon_host = qemu_rbd_mon_host(options, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        r = -EINVAL;
        goto failed_opts;
    }

    secretid = qemu_opt_get(opts, "password-secret");

    pool           = qemu_opt_get(opts, "pool");
    conf           = qemu_opt_get(opts, "conf");
    snap           = qemu_opt_get(opts, "snapshot");
    user           = qemu_opt_get(opts, "user");
    image_name     = qemu_opt_get(opts, "image");
    keypairs       = qemu_opt_get(opts, "=keyvalue-pairs");

    if (!pool || !image_name) {
        error_setg(errp, "Parameters 'pool' and 'image' are required");
        r = -EINVAL;
        goto failed_opts;
    }

    r = rados_create(&s->cluster, user);
    if (r < 0) {
        error_setg_errno(errp, -r, "error initializing");
        goto failed_opts;
    }

    s->snap = g_strdup(snap);
    s->image_name = g_strdup(image_name);

    /* try default location when conf=NULL, but ignore failure */
    r = rados_conf_read_file(s->cluster, conf);
    if (conf && r < 0) {
        error_setg_errno(errp, -r, "error reading conf file %s", conf);
        goto failed_shutdown;
    }

    r = qemu_rbd_set_keypairs(s->cluster, keypairs, errp);
    if (r < 0) {
        goto failed_shutdown;
    }

    if (mon_host) {
        r = rados_conf_set(s->cluster, "mon_host", mon_host);
        if (r < 0) {
            goto failed_shutdown;
        }
    }

    if (qemu_rbd_set_auth(s->cluster, secretid, errp) < 0) {
        r = -EIO;
        goto failed_shutdown;
    }

    /*
     * Fallback to more conservative semantics if setting cache
     * options fails. Ignore errors from setting rbd_cache because the
     * only possible error is that the option does not exist, and
     * librbd defaults to no caching. If write through caching cannot
     * be set up, fall back to no caching.
     */
    if (flags & BDRV_O_NOCACHE) {
        rados_conf_set(s->cluster, "rbd_cache", "false");
    } else {
        rados_conf_set(s->cluster, "rbd_cache", "true");
    }

    r = rados_connect(s->cluster);
    if (r < 0) {
        error_setg_errno(errp, -r, "error connecting");
        goto failed_shutdown;
    }

    r = rados_ioctx_create(s->cluster, pool, &s->io_ctx);
    if (r < 0) {
        error_setg_errno(errp, -r, "error opening pool %s", pool);
        goto failed_shutdown;
    }

    /* rbd_open is always r/w */
    r = rbd_open(s->io_ctx, s->image_name, &s->image, s->snap);
    if (r < 0) {
        error_setg_errno(errp, -r, "error reading header from %s",
                         s->image_name);
        goto failed_open;
    }

    /* If we are using an rbd snapshot, we must be r/o, otherwise
     * leave as-is */
    if (s->snap != NULL) {
        if (!bdrv_is_read_only(bs)) {
            error_report("Opening rbd snapshots without an explicit "
                         "read-only=on option is deprecated. Future versions "
                         "will refuse to open the image instead of "
                         "automatically marking the image read-only.");
            r = bdrv_set_read_only(bs, true, &local_err);
            if (r < 0) {
                error_propagate(errp, local_err);
                goto failed_open;
            }
        }
    }

    qemu_opts_del(opts);
    return 0;

failed_open:
    rados_ioctx_destroy(s->io_ctx);
failed_shutdown:
    rados_shutdown(s->cluster);
    g_free(s->snap);
    g_free(s->image_name);
failed_opts:
    qemu_opts_del(opts);
    g_free(mon_host);
exit:
    return r;
}
Ejemplo n.º 3
0
static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
                         Error **errp)
{
    BDRVRBDState *s = bs->opaque;
    BlockdevOptionsRbd *opts = NULL;
    Visitor *v;
    QObject *crumpled = NULL;
    const QDictEntry *e;
    Error *local_err = NULL;
    const char *filename;
    char *keypairs, *secretid;
    int r;

    /* If we are given a filename, parse the filename, with precedence given to
     * filename encoded options */
    filename = qdict_get_try_str(options, "filename");
    if (filename) {
        warn_report("'filename' option specified. "
                    "This is an unsupported option, and may be deprecated "
                    "in the future");
        qemu_rbd_parse_filename(filename, options, &local_err);
        qdict_del(options, "filename");
        if (local_err) {
            error_propagate(errp, local_err);
            return -EINVAL;
        }
    }

    keypairs = g_strdup(qdict_get_try_str(options, "=keyvalue-pairs"));
    if (keypairs) {
        qdict_del(options, "=keyvalue-pairs");
    }

    secretid = g_strdup(qdict_get_try_str(options, "password-secret"));
    if (secretid) {
        qdict_del(options, "password-secret");
    }

    /* Convert the remaining options into a QAPI object */
    crumpled = qdict_crumple(options, errp);
    if (crumpled == NULL) {
        r = -EINVAL;
        goto out;
    }

    v = qobject_input_visitor_new_keyval(crumpled);
    visit_type_BlockdevOptionsRbd(v, NULL, &opts, &local_err);
    visit_free(v);
    qobject_unref(crumpled);

    if (local_err) {
        error_propagate(errp, local_err);
        r = -EINVAL;
        goto out;
    }

    /* Remove the processed options from the QDict (the visitor processes
     * _all_ options in the QDict) */
    while ((e = qdict_first(options))) {
        qdict_del(options, e->key);
    }

    r = qemu_rbd_connect(&s->cluster, &s->io_ctx, opts,
                         !(flags & BDRV_O_NOCACHE), keypairs, secretid, errp);
    if (r < 0) {
        goto out;
    }

    s->snap = g_strdup(opts->snapshot);
    s->image_name = g_strdup(opts->image);

    /* rbd_open is always r/w */
    r = rbd_open(s->io_ctx, s->image_name, &s->image, s->snap);
    if (r < 0) {
        error_setg_errno(errp, -r, "error reading header from %s",
                         s->image_name);
        goto failed_open;
    }

    /* If we are using an rbd snapshot, we must be r/o, otherwise
     * leave as-is */
    if (s->snap != NULL) {
        if (!bdrv_is_read_only(bs)) {
            error_report("Opening rbd snapshots without an explicit "
                         "read-only=on option is deprecated. Future versions "
                         "will refuse to open the image instead of "
                         "automatically marking the image read-only.");
            r = bdrv_set_read_only(bs, true, &local_err);
            if (r < 0) {
                error_propagate(errp, local_err);
                goto failed_open;
            }
        }
    }

    r = 0;
    goto out;

failed_open:
    rados_ioctx_destroy(s->io_ctx);
    g_free(s->snap);
    g_free(s->image_name);
    rados_shutdown(s->cluster);
out:
    qapi_free_BlockdevOptionsRbd(opts);
    g_free(keypairs);
    g_free(secretid);
    return r;
}