diff options
Diffstat (limited to 'nbd/client.c')
| -rw-r--r-- | nbd/client.c | 53 |
1 files changed, 25 insertions, 28 deletions
diff --git a/nbd/client.c b/nbd/client.c index 8227e69478..77993890f0 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -630,26 +630,30 @@ static QIOChannel *nbd_receive_starttls(QIOChannel *ioc, } /* nbd_negotiate_simple_meta_context: - * Set one meta context. Simple means that reply must contain zero (not - * negotiated) or one (negotiated) contexts. More contexts would be considered - * as a protocol error. It's also implied that meta-data query equals queried - * context name, so, if server replies with something different than @context, - * it is considered an error too. - * return 1 for successful negotiation, context_id is set + * Request the server to set the meta context for export @info->name + * using @info->x_dirty_bitmap with a fallback to "base:allocation", + * setting @info->context_id to the resulting id. Fail if the server + * responds with more than one context or with a context different + * than the query. + * return 1 for successful negotiation, * 0 if operation is unsupported, * -1 with errp set for any other error */ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, - const char *export, - const char *context, - uint32_t *context_id, + NBDExportInfo *info, Error **errp) { + /* + * TODO: Removing the x_dirty_bitmap hack will mean refactoring + * this function to request and store ids for multiple contexts + * (both base:allocation and a dirty bitmap), at which point this + * function should lose the term _simple. + */ int ret; NBDOptionReply reply; - uint32_t received_id = 0; + const char *context = info->x_dirty_bitmap ?: "base:allocation"; bool received = false; - uint32_t export_len = strlen(export); + uint32_t export_len = strlen(info->name); uint32_t context_len = strlen(context); uint32_t data_len = sizeof(export_len) + export_len + sizeof(uint32_t) + /* number of queries */ @@ -657,9 +661,9 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, char *data = g_malloc(data_len); char *p = data; - trace_nbd_opt_meta_request(context, export); + trace_nbd_opt_meta_request(context, info->name); stl_be_p(p, export_len); - memcpy(p += sizeof(export_len), export, export_len); + memcpy(p += sizeof(export_len), info->name, export_len); stl_be_p(p += export_len, 1); stl_be_p(p += sizeof(uint32_t), context_len); memcpy(p += sizeof(context_len), context, context_len); @@ -685,7 +689,7 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, if (reply.type == NBD_REP_META_CONTEXT) { char *name; - if (reply.length != sizeof(received_id) + context_len) { + if (reply.length != sizeof(info->context_id) + context_len) { error_setg(errp, "Failed to negotiate meta context '%s', server " "answered with unexpected length %" PRIu32, context, reply.length); @@ -693,12 +697,13 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, return -1; } - if (nbd_read(ioc, &received_id, sizeof(received_id), errp) < 0) { + if (nbd_read(ioc, &info->context_id, sizeof(info->context_id), + errp) < 0) { return -1; } - received_id = be32_to_cpu(received_id); + info->context_id = be32_to_cpu(info->context_id); - reply.length -= sizeof(received_id); + reply.length -= sizeof(info->context_id); name = g_malloc(reply.length + 1); if (nbd_read(ioc, name, reply.length, errp) < 0) { g_free(name); @@ -715,7 +720,7 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, } g_free(name); - trace_nbd_opt_meta_reply(context, received_id); + trace_nbd_opt_meta_reply(context, info->context_id); received = true; /* receive NBD_REP_ACK */ @@ -744,12 +749,7 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, return -1; } - if (received) { - *context_id = received_id; - return 1; - } - - return 0; + return received; } int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCreds *tlscreds, @@ -848,10 +848,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCreds *tlscreds, } if (info->structured_reply && base_allocation) { - result = nbd_negotiate_simple_meta_context( - ioc, info->name, - info->x_dirty_bitmap ?: "base:allocation", - &info->meta_base_allocation_id, errp); + result = nbd_negotiate_simple_meta_context(ioc, info, errp); if (result < 0) { goto fail; } |