mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bd7ea31b9e
The RPCRDMA marshalling logic assumed that xdr->page_base was an offset into the first page of xdr->page_list. It is in fact an offset into the xdr->page_list itself, that is, it selects the first page in the page_list and the offset into that page. The symptom depended in part on the rpc_memreg_strategy, if it was FRMR, or some other one-shot mapping mode, the connection would get torn down on a base and bounds error. When the badly marshalled RPC was retransmitted it would reconnect, get the error, and tear down the connection again in a loop forever. This resulted in a hung-mount. For the other modes, it would result in silent data corruption. This bug is most easily reproduced by writing more data than the filesystem has space for. This fix corrects the page_base assumption and otherwise simplifies the iov mapping logic. Signed-off-by: Tom Tucker <tom@ogc.us> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> |
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