[PATCH 4.9 127/153] pNFS/flexfiles: If the layout is invalid, it must be updated before retrying

Greg Kroah-Hartman
2017-03-10T10:54:14Z

From: Trond Myklebust <trond.myklebust@primarydata.com>

commit df3ab232e462bce20710596d697ade6b72497694 upstream.

If we see that our pNFS READ/WRITE/COMMIT operation failed, but we
also see that our layout segment is no longer valid, then we need to
get a new layout segment before retrying.

Fixes: 90816d1ddacf ("NFSv4.1/flexfiles: Don't mark the entire deviceid...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfs/flexfilelayout/flexfilelayout.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -1073,9 +1073,6 @@ static int ff_layout_async_handle_error_
struct nfs_client *mds_client = mds_server->nfs_client;
struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;

- if (task->tk_status >= 0)
- return 0;
-
switch (task->tk_status) {
/* MDS state errors */
case -NFS4ERR_DELEG_REVOKED:
@@ -1176,9 +1173,6 @@ static int ff_layout_async_handle_error_
{
struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);

- if (task->tk_status >= 0)
- return 0;
-
switch (task->tk_status) {
/* File access problems. Don't mark the device as unavailable */
case -EACCES:
@@ -1213,6 +1207,13 @@ static int ff_layout_async_handle_error(
{
int vers = clp->cl_nfs_mod->rpc_vers->number;

+ if (task->tk_status >= 0)
+ return 0;
+
+ /* Handle the case of an invalid layout segment */
+ if (!pnfs_is_valid_lseg(lseg))
+ return -NFS4ERR_RESET_TO_PNFS;
+
switch (vers) {
case 3:
return ff_layout_async_handle_error_v3(task, lseg, idx);