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If two programs simultaneously try to write to the same part of a file via direct IO and buffered IO, there's a chance that the post-diowrite pagecache invalidation will fail on the dirty page. When this happens, the dio write succeeded, which means that the page cache is no longer coherent with the disk! Programs are not supposed to mix IO types and this is a clear case of data corruption, so store an EIO which will be reflected to userspace during the next fsync. Replace the WARN_ON with a ratelimited pr_crit so that the developers have /some/ kind of breadcrumb to track down the offending program(s) and file(s) involved. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Liu Bo <bo.li.liu@oracle.com> |
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