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NFS: Fix missing pg_cleanup after nfs_pageio_cond_complete() 

Commit a7d42ddb30 ("nfs: add mirroring
support to pgio layer") moved pg_cleanup out of the path when there was
non-sequental I/O that needed to be flushed.  The result is that for
layouts that have more than one layout segment per file, the pg_lseg is not
cleared, so we can end up hitting the WARN_ON_ONCE(req_start >= seg_end) in
pnfs_generic_pg_test since the pg_lseg will be pointing to that
previously-flushed layout segment.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: a7d42ddb30 ("nfs: add mirroring support to pgio layer")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Benjamin Coddington 2017-04-14 12:29:54 -04:00 committed by Trond Myklebust
parent 62b2417e84
commit 43b7d964ed
1 changed files with 4 additions and 2 deletions
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6
fs/nfs/pagelist.c
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@ -1256,8 +1256,10 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
mirror = &desc->pg_mirrors[midx];
if (!list_empty(&mirror->pg_list)) {
prev = nfs_list_entry(mirror->pg_list.prev);
if (index != prev->wb_index + 1)
nfs_pageio_complete_mirror(desc, midx);
if (index != prev->wb_index + 1) {
nfs_pageio_complete(desc);
break;
}
}
}
}