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nbd: Handle NBD_OPT_LIST option.

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Signed-off-by: Hani Benhabiles <kroosec@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Hani Benhabiles 2014-06-07 01:32:32 +01:00 • committed by Paolo Bonzini
parent f5076b5a75
commit 32d7d2e068
2 changed files with 68 additions and 0 deletions
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65
nbd.c
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@ -84,6 +84,7 @@
#define NBD_OPT_EXPORT_NAME (1)
#define NBD_OPT_ABORT (2)
#define NBD_OPT_LIST (3)
/* Definitions for opaque data types */
@ -249,6 +250,64 @@ static int nbd_send_rep(int csock, uint32_t type, uint32_t opt)
return 0;
}
static int nbd_send_rep_list(int csock, NBDExport *exp)
{
uint64_t magic, name_len;
uint32_t opt, type, len;
name_len = strlen(exp->name);
magic = cpu_to_be64(NBD_REP_MAGIC);
if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
LOG("write failed (magic)");
return -EINVAL;
}
opt = cpu_to_be32(NBD_OPT_LIST);
if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
LOG("write failed (opt)");
return -EINVAL;
}
type = cpu_to_be32(NBD_REP_SERVER);
if (write_sync(csock, &type, sizeof(type)) != sizeof(type)) {
LOG("write failed (reply type)");
return -EINVAL;
}
len = cpu_to_be32(name_len + sizeof(len));
if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) {
LOG("write failed (length)");
return -EINVAL;
}
len = cpu_to_be32(name_len);
if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) {
LOG("write failed (length)");
return -EINVAL;
}
if (write_sync(csock, exp->name, name_len) != name_len) {
LOG("write failed (buffer)");
return -EINVAL;
}
return 0;
}
static int nbd_handle_list(NBDClient *client, uint32_t length)
{
int csock;
NBDExport *exp;
csock = client->sock;
if (length) {
return nbd_send_rep(csock, NBD_REP_ERR_INVALID, NBD_OPT_LIST);
}
/* For each export, send a NBD_REP_SERVER reply. */
QTAILQ_FOREACH(exp, &exports, next) {
if (nbd_send_rep_list(csock, exp)) {
return -EINVAL;
}
}
/* Finish with a NBD_REP_ACK. */
return nbd_send_rep(csock, NBD_REP_ACK, NBD_OPT_LIST);
}
static int nbd_handle_export_name(NBDClient *client, uint32_t length)
{
int rc = -EINVAL, csock = client->sock;
@ -330,6 +389,12 @@ static int nbd_receive_options(NBDClient *client)
TRACE("Checking option");
switch (be32_to_cpu(tmp)) {
case NBD_OPT_LIST:
if (nbd_handle_list(client, length) < 0) {
return 1;
}
break;
case NBD_OPT_ABORT:
return -EINVAL;