On Wed, 2012-03-21 at 15:46 -0400, andros@xxxxxxxxxx wrote:
> From: Andy Adamson <andros@xxxxxxxxxx>
>
> This prevents the use of any layout for i/o that references the deviceid.
> I/O is redirected through the MDS.
>
> Redirect the unhandled failed I/O to the MDS without marking either the
> layout or the deviceid invalid.
>
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
> ---
> fs/nfs/nfs4filelayout.c | 65 ++++++++++++++++++++++++++++++++++------------
> fs/nfs/nfs4filelayout.h | 6 ++++
> 2 files changed, 54 insertions(+), 17 deletions(-)
>
> diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
> index 3802937..1f1be26 100644
> --- a/fs/nfs/nfs4filelayout.c
> +++ b/fs/nfs/nfs4filelayout.c
> @@ -116,7 +116,7 @@ void filelayout_reset_read(struct rpc_task *task, struct nfs_read_data *data)
> static int filelayout_async_handle_error(struct rpc_task *task,
> struct nfs4_state *state,
> struct nfs_client *clp,
> - int *reset)
> + unsigned long *reset)
> {
> struct nfs_server *mds_server = NFS_SERVER(state->inode);
> struct nfs_client *mds_client = mds_server->nfs_client;
> @@ -158,10 +158,23 @@ static int filelayout_async_handle_error(struct rpc_task *task,
> break;
> case -NFS4ERR_RETRY_UNCACHED_REP:
> break;
> + /* RPC connection errors */
> + case -ECONNREFUSED:
> + case -EHOSTDOWN:
> + case -EHOSTUNREACH:
> + case -ENETUNREACH:
> + case -EIO:
> + case -ETIMEDOUT:
> + case -EPIPE:
> + dprintk("%s DS connection error. Retry through MDS %d\n",
> + __func__, task->tk_status);
> + set_bit(NFS4_RESET_DEVICEID, reset);
> + set_bit(NFS4_RESET_TO_MDS, reset);
> + break;
> default:
> - dprintk("%s DS error. Retry through MDS %d\n", __func__,
> - task->tk_status);
> - *reset = 1;
> + dprintk("%s Unhandled DS error. Retry through MDS %d\n",
> + __func__, task->tk_status);
> + set_bit(NFS4_RESET_TO_MDS, reset);
> break;
> }
> out:
> @@ -179,16 +192,22 @@ wait_on_recovery:
> static int filelayout_read_done_cb(struct rpc_task *task,
> struct nfs_read_data *data)
> {
> - int reset = 0;
> + struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(data->lseg);
> + unsigned long reset = 0;
>
> dprintk("%s DS read\n", __func__);
>
> if (filelayout_async_handle_error(task, data->args.context->state,
> data->ds_clp, &reset) == -EAGAIN) {
> - dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
> - __func__, data->ds_clp, data->ds_clp->cl_session);
> - if (reset)
> +
> + dprintk("%s reset 0x%lx ds_clp %p session %p\n", __func__,
> + reset, data->ds_clp, data->ds_clp->cl_session);
> +
> + if (test_bit(NFS4_RESET_TO_MDS, &reset)) {
> filelayout_reset_read(task, data);
> + if (test_bit(NFS4_RESET_DEVICEID, &reset))
> + filelayout_mark_devid_invalid(devid);
Is there any reason why we shouldn't just do the
filelayout_mark_devid_invalid() within filelayout_async_handle_error()
instead of having the caller do it?
That should also enable us to get rid of the whole 'reset' argument and
replace it with a return value != 0 && != -EAGAIN.
> + }
> rpc_restart_call_prepare(task);
This can probably also be done inside filelayout_async_handle_error(),
BTW.
> return -EAGAIN;
> }
> @@ -260,14 +279,20 @@ static void filelayout_read_release(void *data)
> static int filelayout_write_done_cb(struct rpc_task *task,
> struct nfs_write_data *data)
> {
> - int reset = 0;
> + struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(data->lseg);
> + unsigned long reset = 0;
>
> if (filelayout_async_handle_error(task, data->args.context->state,
> data->ds_clp, &reset) == -EAGAIN) {
> - dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
> - __func__, data->ds_clp, data->ds_clp->cl_session);
> - if (reset)
> +
> + dprintk("%s reset 0x%lx ds_clp %p session %p\n", __func__,
> + reset, data->ds_clp, data->ds_clp->cl_session);
> +
> + if (test_bit(NFS4_RESET_TO_MDS, &reset)) {
> filelayout_reset_write(task, data);
> + if (test_bit(NFS4_RESET_DEVICEID, &reset))
> + filelayout_mark_devid_invalid(devid);
> + }
> rpc_restart_call_prepare(task);
> return -EAGAIN;
> }
> @@ -290,16 +315,22 @@ static void prepare_to_resend_writes(struct nfs_write_data *data)
> static int filelayout_commit_done_cb(struct rpc_task *task,
> struct nfs_write_data *data)
> {
> - int reset = 0;
> + struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(data->lseg);
> + unsigned long reset = 0;
>
> if (filelayout_async_handle_error(task, data->args.context->state,
> data->ds_clp, &reset) == -EAGAIN) {
> - dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
> - __func__, data->ds_clp, data->ds_clp->cl_session);
> - if (reset)
> +
> + dprintk("%s reset 0x%lx ds_clp %p session %p\n", __func__,
> + reset, data->ds_clp, data->ds_clp->cl_session);
> +
> + if (test_bit(NFS4_RESET_TO_MDS, &reset)) {
> prepare_to_resend_writes(data);
> - else
> + if (test_bit(NFS4_RESET_DEVICEID, &reset))
> + filelayout_mark_devid_invalid(devid);
> + } else {
> rpc_restart_call_prepare(task);
> + }
> return -EAGAIN;
> }
>
> diff --git a/fs/nfs/nfs4filelayout.h b/fs/nfs/nfs4filelayout.h
> index b54b389..08b667a 100644
> --- a/fs/nfs/nfs4filelayout.h
> +++ b/fs/nfs/nfs4filelayout.h
> @@ -41,6 +41,12 @@
> #define NFS4_PNFS_MAX_STRIPE_CNT 4096
> #define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
>
> +/* internal use */
> +enum nfs4_fl_reset_state {
> + NFS4_RESET_TO_MDS = 0,
> + NFS4_RESET_DEVICEID,
> +};
> +
> enum stripetype4 {
> STRIPE_SPARSE = 1,
> STRIPE_DENSE = 2
--
Trond Myklebust
Linux NFS client maintainer
NetApp
Trond.Myklebust@xxxxxxxxxx
www.netapp.com
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