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From: Kevin Wolf <kwolf@redhat.com>
To: qemu-block@nongnu.org
Date: Mon, 5 Nov 2018 17:37:31 +0100
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Subject: [Qemu-devel] [PULL 23/36] nbd: Support auto-read-only option
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If read-only=3Doff, but auto-read-only=3Don is given, open a read-write NBD
connection if the server provides a read-write export, but instead of
erroring out for read-only exports, just degrade to read-only.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
block/nbd-client.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 9686ecbd5e..76e9ca3abe 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -992,11 +992,11 @@ int nbd_client_init(BlockDriverState *bs,
logout("Failed to negotiate with the NBD server\n");
return ret;
}
- if (client->info.flags & NBD_FLAG_READ_ONLY &&
- !bdrv_is_read_only(bs)) {
- error_setg(errp,
- "request for write access conflicts with read-only expo=
rt");
- return -EACCES;
+ if (client->info.flags & NBD_FLAG_READ_ONLY) {
+ ret =3D bdrv_apply_auto_read_only(bs, "NBD export is read-only", e=
rrp);
+ if (ret < 0) {
+ return ret;
+ }
}
if (client->info.flags & NBD_FLAG_SEND_FUA) {
bs->supported_write_flags =3D BDRV_REQ_FUA;
--=20
2.19.1