pNFS/flexfiles: Report ENETDOWN as a connection error

[ Upstream commit aa42add73ce9b9e3714723d385c254b75814e335 ]

If the client should see an ENETDOWN when trying to connect to the data
server, it might still be able to talk to the metadata server through
another NIC. If so, report the error.

Signed-off-by: Trond Myklebust <[email protected]>
Reviewed-by: Jeff Layton <[email protected]>
Tested-by: Jeff Layton <[email protected]>
Acked-by: Chuck Lever <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit 1630224189cc43768669d60412460118ebcb74b4)
Signed-off-by: Jack Vogel <[email protected]>

Author: Trond Myklebust

fs/nfs/flexfilelayout/flexfilelayout.c

@@ -1263,6 +1263,7 @@ static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
 		case -ECONNRESET:
 		case -EHOSTDOWN:
 		case -EHOSTUNREACH:
+		case -ENETDOWN:
 		case -ENETUNREACH:
 		case -EADDRINUSE:
 		case -ENOBUFS: