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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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5
nbd.c
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@ -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)