iomap: Set all uptodate bits for an Uptodate page
For filesystems with block size < page size, we need to set all the per-block uptodate bits if the page was already uptodate at the time we create the per-block metadata. This can happen if the page is invalidated (eg by a write to drop_caches) but ultimately not removed from the page cache. This is a data corruption issue as page writeback skips blocks which are marked !uptodate. Fixes: 9dc55f13 ("iomap: add support for sub-pagesize buffered I/O without buffer heads") Signed-off-by:Matthew Wilcox (Oracle) <willy@infradead.org> Reported-by:
Qian Cai <cai@redhat.com> Cc: Brian Foster <bfoster@redhat.com> Reviewed-by:
Gao Xiang <hsiangkao@redhat.com> Reviewed-by:
Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:
Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by:
Christoph Hellwig <hch@lst.de>
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