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nbd: use BlockDriverState refcnt

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Previously, nbd calls drive_get_ref() on the drive of bs. A BDS doesn't
always have associated dinfo, which nbd doesn't care either. We already
have BDS ref count, so use it to make it safe for a BDS w/o blockdev.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2013-08-23 09:14:50 +08:00 committed by Stefan Hajnoczi
parent c0777fe18b
commit 38b54b6dc1
2 changed files with 6 additions and 9 deletions
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10
blockdev-nbd.c
View File

@ -69,12 +69,6 @@ static void nbd_close_notifier(Notifier *n, void *data)
g_free(cn);
}
static void nbd_server_put_ref(NBDExport *exp)
{
BlockDriverState *bs = nbd_export_get_blockdev(exp);
drive_put_ref(drive_get_by_blockdev(bs));
}
void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
Error **errp)
{
@ -105,11 +99,9 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
writable = false;
}
exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY,
nbd_server_put_ref);
exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY, NULL);
nbd_export_set_name(exp, device);
drive_get_ref(drive_get_by_blockdev(bs));
n = g_malloc0(sizeof(NBDCloseNotifier));
n->n.notify = nbd_close_notifier;

5
nbd.c
View File

@ -882,6 +882,7 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset,
exp->nbdflags = nbdflags;
exp->size = size == -1 ? bdrv_getlength(bs) : size;
exp->close = close;
bdrv_ref(bs);
return exp;
}
@ -928,6 +929,10 @@ void nbd_export_close(NBDExport *exp)
}
nbd_export_set_name(exp, NULL);
nbd_export_put(exp);
if (exp->bs) {
bdrv_unref(exp->bs);
exp->bs = NULL;
}
}
void nbd_export_get(NBDExport *exp)