On 2015-07-05 at 02:33 +0800, Edward Shishkin wrote: > On 07/05/2015 01:53 AM, Ivan Shapovalov wrote: > > On 2015-07-04 at 15:53 +0800, Edward Shishkin wrote: > > > > > > [...] > > > And how to test directly at mount time? > > Something along the lines of > > - allocate 1 MiB of contiguous space > > - fill it with non-zeros > > - for N = 1, 2, 4, ...: > > - discard N sectors from the contiguous space > > - check if anything in the discarded space became zero-filled > > - if it did, infer alignnment from the first zero-filled block, > > infer granularity from the zero-filled region size. > > > mkfs seems to be more suitable for this funny business Yeah, sure. So... new superblock format with two extra fields? > > > > > It seems that nobody cares about it.. > > It's just ATA interface does not provide necessary data. > > > OK, so our precise discard extension is waiting for the > best times.. I hope we'll be able to merge it eventually (esp. the final patch which accounts for non-idempotence of check-and-allocate-blocks). Thanks, -- Ivan Shapovalov / intelfx /
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