That can deadlock if this is the last reference since
nfs_page_group_destroy() calls nfs_page_group_sync_on_bit().
Note that even if the page was removed from the subpage list,
the req->wb_head could still be pointing to the old head.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/write.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 121218d4e5ed..36d34a4c86bd 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -532,9 +532,9 @@ nfs_lock_and_join_requests(struct page *page)
} else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset ||
((subreq->wb_offset + subreq->wb_bytes) >
(head->wb_offset + total_bytes)))) {
+ nfs_page_group_unlock(head);
nfs_unroll_locks(inode, head, subreq);
nfs_unlock_and_release_request(subreq);
- nfs_page_group_unlock(head);
nfs_unlock_and_release_request(head);
return ERR_PTR(-EIO);
}
--
2.13.5
--
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