4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Benjamin Coddington <bcodding@xxxxxxxxxx>
[ Upstream commit 43b7d964ed30dbca5c83c90cb010985b429ec4f9 ]
Commit a7d42ddb3099727f58366fa006f850a219cce6c8 ("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@xxxxxxxxxx>
Fixes: a7d42ddb3099 ("nfs: add mirroring support to pgio layer")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/pagelist.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -1262,8 +1262,10 @@ void nfs_pageio_cond_complete(struct nfs
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;
+ }
}
}
}