diff options
| author | NeilBrown <[email protected]> | 2016-12-19 00:19:31 +0000 |
|---|---|---|
| committer | Trond Myklebust <[email protected]> | 2016-12-19 22:29:48 +0000 |
| commit | cfd278c280f997cf2fe4662e0acab0fe465f637b (patch) | |
| tree | 963bf8eb8afb2d1085ef8aaf09be6524fe70e5c5 /fs/nfs/filelayout/filelayoutdev.c | |
| parent | pNFS/flexfiles: delete deviceid, don't mark inactive (diff) | |
| download | kernel-cfd278c280f997cf2fe4662e0acab0fe465f637b.tar.gz kernel-cfd278c280f997cf2fe4662e0acab0fe465f637b.zip | |
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: c23266d532b4 ("NFS4.1 Fix data server connection race")
Signed-off-by: NeilBrown <[email protected]>
Acked-by: Olga Kornievskaia <[email protected]>
Acked-by: Adamson, Andy <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Diffstat (limited to 'fs/nfs/filelayout/filelayoutdev.c')
| -rw-r--r-- | fs/nfs/filelayout/filelayoutdev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfs/filelayout/filelayoutdev.c b/fs/nfs/filelayout/filelayoutdev.c index a5589b791439..f956ca20a8a3 100644 --- a/fs/nfs/filelayout/filelayoutdev.c +++ b/fs/nfs/filelayout/filelayoutdev.c @@ -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; |