From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/block/nbd.c | 448 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 448 insertions(+) create mode 100644 qemu/block/nbd.c (limited to 'qemu/block/nbd.c') diff --git a/qemu/block/nbd.c b/qemu/block/nbd.c new file mode 100644 index 000000000..217618612 --- /dev/null +++ b/qemu/block/nbd.c @@ -0,0 +1,448 @@ +/* + * QEMU Block driver for NBD + * + * Copyright (C) 2008 Bull S.A.S. + * Author: Laurent Vivier + * + * Some parts: + * Copyright (C) 2007 Anthony Liguori + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "block/nbd-client.h" +#include "qemu/uri.h" +#include "block/block_int.h" +#include "qemu/module.h" +#include "qemu/sockets.h" +#include "qapi/qmp/qdict.h" +#include "qapi/qmp/qjson.h" +#include "qapi/qmp/qint.h" +#include "qapi/qmp/qstring.h" + +#include +#include + +#define EN_OPTSTR ":exportname=" + +typedef struct BDRVNBDState { + NbdClientSession client; + QemuOpts *socket_opts; +} BDRVNBDState; + +static int nbd_parse_uri(const char *filename, QDict *options) +{ + URI *uri; + const char *p; + QueryParams *qp = NULL; + int ret = 0; + bool is_unix; + + uri = uri_parse(filename); + if (!uri) { + return -EINVAL; + } + + /* transport */ + if (!strcmp(uri->scheme, "nbd")) { + is_unix = false; + } else if (!strcmp(uri->scheme, "nbd+tcp")) { + is_unix = false; + } else if (!strcmp(uri->scheme, "nbd+unix")) { + is_unix = true; + } else { + ret = -EINVAL; + goto out; + } + + p = uri->path ? uri->path : "/"; + p += strspn(p, "/"); + if (p[0]) { + qdict_put(options, "export", qstring_from_str(p)); + } + + qp = query_params_parse(uri->query); + if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) { + ret = -EINVAL; + goto out; + } + + if (is_unix) { + /* nbd+unix:///export?socket=path */ + if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) { + ret = -EINVAL; + goto out; + } + qdict_put(options, "path", qstring_from_str(qp->p[0].value)); + } else { + QString *host; + /* nbd[+tcp]://host[:port]/export */ + if (!uri->server) { + ret = -EINVAL; + goto out; + } + + /* strip braces from literal IPv6 address */ + if (uri->server[0] == '[') { + host = qstring_from_substr(uri->server, 1, + strlen(uri->server) - 2); + } else { + host = qstring_from_str(uri->server); + } + + qdict_put(options, "host", host); + if (uri->port) { + char* port_str = g_strdup_printf("%d", uri->port); + qdict_put(options, "port", qstring_from_str(port_str)); + g_free(port_str); + } + } + +out: + if (qp) { + query_params_free(qp); + } + uri_free(uri); + return ret; +} + +static void nbd_parse_filename(const char *filename, QDict *options, + Error **errp) +{ + char *file; + char *export_name; + const char *host_spec; + const char *unixpath; + + if (qdict_haskey(options, "host") + || qdict_haskey(options, "port") + || qdict_haskey(options, "path")) + { + error_setg(errp, "host/port/path and a file name may not be specified " + "at the same time"); + return; + } + + if (strstr(filename, "://")) { + int ret = nbd_parse_uri(filename, options); + if (ret < 0) { + error_setg(errp, "No valid URL specified"); + } + return; + } + + file = g_strdup(filename); + + export_name = strstr(file, EN_OPTSTR); + if (export_name) { + if (export_name[strlen(EN_OPTSTR)] == 0) { + goto out; + } + export_name[0] = 0; /* truncate 'file' */ + export_name += strlen(EN_OPTSTR); + + qdict_put(options, "export", qstring_from_str(export_name)); + } + + /* extract the host_spec - fail if it's not nbd:... */ + if (!strstart(file, "nbd:", &host_spec)) { + error_setg(errp, "File name string for NBD must start with 'nbd:'"); + goto out; + } + + if (!*host_spec) { + goto out; + } + + /* are we a UNIX or TCP socket? */ + if (strstart(host_spec, "unix:", &unixpath)) { + qdict_put(options, "path", qstring_from_str(unixpath)); + } else { + InetSocketAddress *addr = NULL; + + addr = inet_parse(host_spec, errp); + if (!addr) { + goto out; + } + + qdict_put(options, "host", qstring_from_str(addr->host)); + qdict_put(options, "port", qstring_from_str(addr->port)); + qapi_free_InetSocketAddress(addr); + } + +out: + g_free(file); +} + +static void nbd_config(BDRVNBDState *s, QDict *options, char **export, + Error **errp) +{ + Error *local_err = NULL; + + if (qdict_haskey(options, "path") == qdict_haskey(options, "host")) { + if (qdict_haskey(options, "path")) { + error_setg(errp, "path and host may not be used at the same time."); + } else { + error_setg(errp, "one of path and host must be specified."); + } + return; + } + + s->client.is_unix = qdict_haskey(options, "path"); + s->socket_opts = qemu_opts_create(&socket_optslist, NULL, 0, + &error_abort); + + qemu_opts_absorb_qdict(s->socket_opts, options, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + if (!qemu_opt_get(s->socket_opts, "port")) { + qemu_opt_set_number(s->socket_opts, "port", NBD_DEFAULT_PORT, + &error_abort); + } + + *export = g_strdup(qdict_get_try_str(options, "export")); + if (*export) { + qdict_del(options, "export"); + } +} + +NbdClientSession *nbd_get_client_session(BlockDriverState *bs) +{ + BDRVNBDState *s = bs->opaque; + return &s->client; +} + +static int nbd_establish_connection(BlockDriverState *bs, Error **errp) +{ + BDRVNBDState *s = bs->opaque; + int sock; + + if (s->client.is_unix) { + sock = unix_connect_opts(s->socket_opts, errp, NULL, NULL); + } else { + sock = inet_connect_opts(s->socket_opts, errp, NULL, NULL); + if (sock >= 0) { + socket_set_nodelay(sock); + } + } + + /* Failed to establish connection */ + if (sock < 0) { + logout("Failed to establish connection to NBD server\n"); + return -EIO; + } + + return sock; +} + +static int nbd_open(BlockDriverState *bs, QDict *options, int flags, + Error **errp) +{ + BDRVNBDState *s = bs->opaque; + char *export = NULL; + int result, sock; + Error *local_err = NULL; + + /* Pop the config into our state object. Exit if invalid. */ + nbd_config(s, options, &export, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return -EINVAL; + } + + /* establish TCP connection, return error if it fails + * TODO: Configurable retry-until-timeout behaviour. + */ + sock = nbd_establish_connection(bs, errp); + if (sock < 0) { + g_free(export); + return sock; + } + + /* NBD handshake */ + result = nbd_client_init(bs, sock, export, errp); + g_free(export); + return result; +} + +static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num, + int nb_sectors, QEMUIOVector *qiov) +{ + return nbd_client_co_readv(bs, sector_num, nb_sectors, qiov); +} + +static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num, + int nb_sectors, QEMUIOVector *qiov) +{ + return nbd_client_co_writev(bs, sector_num, nb_sectors, qiov); +} + +static int nbd_co_flush(BlockDriverState *bs) +{ + return nbd_client_co_flush(bs); +} + +static void nbd_refresh_limits(BlockDriverState *bs, Error **errp) +{ + bs->bl.max_discard = UINT32_MAX >> BDRV_SECTOR_BITS; + bs->bl.max_transfer_length = UINT32_MAX >> BDRV_SECTOR_BITS; +} + +static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num, + int nb_sectors) +{ + return nbd_client_co_discard(bs, sector_num, nb_sectors); +} + +static void nbd_close(BlockDriverState *bs) +{ + BDRVNBDState *s = bs->opaque; + + qemu_opts_del(s->socket_opts); + nbd_client_close(bs); +} + +static int64_t nbd_getlength(BlockDriverState *bs) +{ + BDRVNBDState *s = bs->opaque; + + return s->client.size; +} + +static void nbd_detach_aio_context(BlockDriverState *bs) +{ + nbd_client_detach_aio_context(bs); +} + +static void nbd_attach_aio_context(BlockDriverState *bs, + AioContext *new_context) +{ + nbd_client_attach_aio_context(bs, new_context); +} + +static void nbd_refresh_filename(BlockDriverState *bs) +{ + QDict *opts = qdict_new(); + const char *path = qdict_get_try_str(bs->options, "path"); + const char *host = qdict_get_try_str(bs->options, "host"); + const char *port = qdict_get_try_str(bs->options, "port"); + const char *export = qdict_get_try_str(bs->options, "export"); + + qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("nbd"))); + + if (path && export) { + snprintf(bs->exact_filename, sizeof(bs->exact_filename), + "nbd+unix:///%s?socket=%s", export, path); + } else if (path && !export) { + snprintf(bs->exact_filename, sizeof(bs->exact_filename), + "nbd+unix://?socket=%s", path); + } else if (!path && export && port) { + snprintf(bs->exact_filename, sizeof(bs->exact_filename), + "nbd://%s:%s/%s", host, port, export); + } else if (!path && export && !port) { + snprintf(bs->exact_filename, sizeof(bs->exact_filename), + "nbd://%s/%s", host, export); + } else if (!path && !export && port) { + snprintf(bs->exact_filename, sizeof(bs->exact_filename), + "nbd://%s:%s", host, port); + } else if (!path && !export && !port) { + snprintf(bs->exact_filename, sizeof(bs->exact_filename), + "nbd://%s", host); + } + + if (path) { + qdict_put_obj(opts, "path", QOBJECT(qstring_from_str(path))); + } else if (port) { + qdict_put_obj(opts, "host", QOBJECT(qstring_from_str(host))); + qdict_put_obj(opts, "port", QOBJECT(qstring_from_str(port))); + } else { + qdict_put_obj(opts, "host", QOBJECT(qstring_from_str(host))); + } + if (export) { + qdict_put_obj(opts, "export", QOBJECT(qstring_from_str(export))); + } + + bs->full_open_options = opts; +} + +static BlockDriver bdrv_nbd = { + .format_name = "nbd", + .protocol_name = "nbd", + .instance_size = sizeof(BDRVNBDState), + .bdrv_parse_filename = nbd_parse_filename, + .bdrv_file_open = nbd_open, + .bdrv_co_readv = nbd_co_readv, + .bdrv_co_writev = nbd_co_writev, + .bdrv_close = nbd_close, + .bdrv_co_flush_to_os = nbd_co_flush, + .bdrv_co_discard = nbd_co_discard, + .bdrv_refresh_limits = nbd_refresh_limits, + .bdrv_getlength = nbd_getlength, + .bdrv_detach_aio_context = nbd_detach_aio_context, + .bdrv_attach_aio_context = nbd_attach_aio_context, + .bdrv_refresh_filename = nbd_refresh_filename, +}; + +static BlockDriver bdrv_nbd_tcp = { + .format_name = "nbd", + .protocol_name = "nbd+tcp", + .instance_size = sizeof(BDRVNBDState), + .bdrv_parse_filename = nbd_parse_filename, + .bdrv_file_open = nbd_open, + .bdrv_co_readv = nbd_co_readv, + .bdrv_co_writev = nbd_co_writev, + .bdrv_close = nbd_close, + .bdrv_co_flush_to_os = nbd_co_flush, + .bdrv_co_discard = nbd_co_discard, + .bdrv_refresh_limits = nbd_refresh_limits, + .bdrv_getlength = nbd_getlength, + .bdrv_detach_aio_context = nbd_detach_aio_context, + .bdrv_attach_aio_context = nbd_attach_aio_context, + .bdrv_refresh_filename = nbd_refresh_filename, +}; + +static BlockDriver bdrv_nbd_unix = { + .format_name = "nbd", + .protocol_name = "nbd+unix", + .instance_size = sizeof(BDRVNBDState), + .bdrv_parse_filename = nbd_parse_filename, + .bdrv_file_open = nbd_open, + .bdrv_co_readv = nbd_co_readv, + .bdrv_co_writev = nbd_co_writev, + .bdrv_close = nbd_close, + .bdrv_co_flush_to_os = nbd_co_flush, + .bdrv_co_discard = nbd_co_discard, + .bdrv_refresh_limits = nbd_refresh_limits, + .bdrv_getlength = nbd_getlength, + .bdrv_detach_aio_context = nbd_detach_aio_context, + .bdrv_attach_aio_context = nbd_attach_aio_context, + .bdrv_refresh_filename = nbd_refresh_filename, +}; + +static void bdrv_nbd_init(void) +{ + bdrv_register(&bdrv_nbd); + bdrv_register(&bdrv_nbd_tcp); + bdrv_register(&bdrv_nbd_unix); +} + +block_init(bdrv_nbd_init); -- cgit 1.2.3-korg