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Under Linux when rolling back a mounted filesystem negative dentries may not be dropped from the cache. This can result in an ENOENT being incorrectly returned on first access. Issuing a `df` before the unmount results in the negative dentries being invalidated and side steps the issue. This is solely a workaround for the test case on Linux and not correct behavior. The core issue of invalidating negative dentries needs to be handled with a kernel side change. This is being tracked as issue openzfs#6143. Reviewed-by: George Melikov <[email protected]> Reviewed-by: John Kennedy <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes openzfs#12898 Issue openzfs#6143
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