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    Subject[Patch v2 18/19] CIFS: SMBD: Deregister memory when finishing SMB READ
    Date
    From: Long Li <longli@microsoft.com>

    When SMB READ is finished, deregister the memory regions if RDMA write is used for this SMB READ. smbd_deregister_mr may need to do local invalidation and sleep, if server remote invalidation is not used.

    Signed-off-by: Long Li <longli@microsoft.com>
    ---
    fs/cifs/smb2pdu.c | 10 ++++++++++
    1 file changed, 10 insertions(+)

    diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
    index 1f08c75..43a7b60 100644
    --- a/fs/cifs/smb2pdu.c
    +++ b/fs/cifs/smb2pdu.c
    @@ -2504,6 +2504,16 @@ smb2_readv_callback(struct mid_q_entry *mid)
    rdata->result = -EIO;
    }

    + /*
    + * If this rdata has a memmory registered, the MR can be freed
    + * MR needs to be freed as soon as I/O finishes to prevent deadlock
    + * because they have limited number and are used for future I/Os
    + */
    + if (rdata->mr) {
    + smbd_deregister_mr(rdata->mr);
    + rdata->mr = NULL;
    + }
    +
    if (rdata->result)
    cifs_stats_fail_inc(tcon, SMB2_READ_HE);

    --
    2.7.4
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