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由 Yan, Zheng 提交于
When readahead encounters file holes, osd reply returns error -ENOENT, finish_read() skips adding pages to the the page cache. So readahead does not work for file holes. The fix is adding zero pages to the page cache when -ENOENT is returned. Signed-off-by: NYan, Zheng <zyan@redhat.com>
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