>>>>> "Ted" == Theodore Ts'o <tytso@xxxxxxx> writes: Ted, [issue_zeroout_or_write_same] Ted> How do people think I should implement this functionality? I see Ted> three possible choices: I did think about doing this when I originally implemented support for WRITE SAME. However, one caveat is that there are corner cases where devices that -- despite reporting that they return zeroed data after TRIM -- will return non-zeroes. The issue being that TRIM is a hint and there are no hard guarantees. Even if a device reports DRAT/RZAT. So the reason I didn't end up adding a call like yours is that the result is non-deterministic. The call would have to be "please zero this block range but I don't *actually* rely on getting zeroes back". I don't have a problem providing a function that does that as long as the best-effort limitation is made crystal clear. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
