diff options
Diffstat (limited to 'block/nbd-client.c')
| -rw-r--r-- | block/nbd-client.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/block/nbd-client.c b/block/nbd-client.c index ea728fffc8..db9d41eb04 100644 --- a/block/nbd-client.c +++ b/block/nbd-client.c @@ -256,6 +256,7 @@ int nbd_client_co_pwritev(BlockDriverState *bs, uint64_t offset, NBDReply reply; ssize_t ret; + assert(!(client->info.flags & NBD_FLAG_READ_ONLY)); if (flags & BDRV_REQ_FUA) { assert(client->info.flags & NBD_FLAG_SEND_FUA); request.flags |= NBD_CMD_FLAG_FUA; @@ -284,6 +285,7 @@ int nbd_client_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, }; NBDReply reply; + assert(!(client->info.flags & NBD_FLAG_READ_ONLY)); if (!(client->info.flags & NBD_FLAG_SEND_WRITE_ZEROES)) { return -ENOTSUP; } @@ -339,6 +341,7 @@ int nbd_client_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes) NBDReply reply; ssize_t ret; + assert(!(client->info.flags & NBD_FLAG_READ_ONLY)); if (!(client->info.flags & NBD_FLAG_SEND_TRIM)) { return 0; } @@ -403,6 +406,12 @@ 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 export"); + return -EACCES; + } if (client->info.flags & NBD_FLAG_SEND_FUA) { bs->supported_write_flags = BDRV_REQ_FUA; bs->supported_zero_flags |= BDRV_REQ_FUA; |