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nfs: always make sure page is up-to-date before extending a write to …
…cover the entire page We should always make sure the cached page is up-to-date when we're determining whether we can extend a write to cover the full page -- even if we've received a write delegation from the server. Commit c755966 added logic to skip this check if we have a write delegation, which can lead to data corruption such as the following scenario if client B receives a write delegation from the NFS server: Client A: # echo 123456789 > /mnt/file Client B: # echo abcdefghi >> /mnt/file # cat /mnt/file 0�D0�abcdefghi Just because we hold a write delegation doesn't mean that we've read in the entire page contents. Cc: <firstname.lastname@example.org> # v3.11+ Signed-off-by: Scott Mayhew <email@example.com> Signed-off-by: Trond Myklebust <firstname.lastname@example.org>
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