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NFSv4.1: nfs4_fl_prepare_ds must be careful about reporting success. 

Various places assume that if nfs4_fl_prepare_ds() turns a non-NULL 'ds',
then ds->ds_clp will also be non-NULL.

This is not necessasrily true in the case when the process received a fatal signal
while nfs4_pnfs_ds_connect is waiting in nfs4_wait_ds_connect().
In that case ->ds_clp may not be set, and the devid may not recently have been marked
unavailable.

So add a test for ds_clp == NULL and return NULL in that case.

Fixes: c23266d532 ("NFS4.1 Fix data server connection race")
Signed-off-by: NeilBrown <neilb@suse.com>
Acked-by: Olga Kornievskaia <aglo@umich.edu>
Acked-by: Adamson, Andy <William.Adamson@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
NeilBrown 2016-12-19 11:19:31 +11:00 committed by Trond Myklebust
parent 1c48cee83b
commit cfd278c280
1 changed files with 2 additions and 1 deletions
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3
fs/nfs/filelayout/filelayoutdev.c
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@ -282,7 +282,8 @@ nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
s->nfs_client->cl_minorversion);
out_test_devid:
if (filelayout_test_devid_unavailable(devid))
if (ret->ds_clp == NULL ||
filelayout_test_devid_unavailable(devid))
ret = NULL;
out:
return ret;