On 05/09/2017 04:30 PM, NeilBrown wrote:
On Tue, May 09 2017, Jes Sorensen wrote:
On 05/03/2017 10:04 PM, Shaohua Li wrote:
On Thu, May 04, 2017 at 11:07:01AM +1000, Neil Brown wrote:
On Wed, May 03 2017, Shaohua Li wrote:
This doesn't work well. read returns 0 for trimmed data space in some SSDs, but
not all. If not, we will have trouble.
/sys/block/<device>/queue/discard_zeroes_data
We could use this as an indicator for what to do.
According to
Documentation/ABI/testing/sysfs-block
Description:
Will always return 0. Don't rely on any specific behavior
for discards, and don't read this file.
See also
Commit: 48920ff2a5a9 ("block: remove the discard_zeroes_data flag")
Crap!
Back to the drawing board :(
Jes
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