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nfs: always update creds in mirror, even when we have an already connected ds 

A ds can be associated with more than one mirror, but we currently skip
setting a mirror's credentials if we find that it's already set up with
a connected client.

The upshot is that we can end up sending DS writes with MDS credentials
instead of properly setting them up. Fix nfs4_ff_layout_prepare_ds to
always verify that the mirror's credentials are set up, even when we
have a DS that's already connected.

Reported-by: Tom Haynes <thomas.haynes@primarydata.com>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Cc: stable@vger.kernel.org # 4.0+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Jeff Layton 2015-06-24 12:10:24 -04:00 committed by Trond Myklebust
parent a24221dca1
commit 0c8315dd56
1 changed files with 2 additions and 2 deletions
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4
fs/nfs/flexfilelayout/flexfilelayoutdev.c
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@ -387,7 +387,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
/* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
smp_rmb();
if (ds->ds_clp)
goto out;
goto out_update_creds;
flavor = nfs4_ff_layout_choose_authflavor(mirror);
@ -431,7 +431,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
}
}
}
out_update_creds:
if (ff_layout_update_mirror_cred(mirror, ds))
ds = NULL;
out: