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hw/block/nvme: conditionally enable DULBE for zoned namespaces 

The device uses the BDRV_BLOCK_ZERO flag to determine the "deallocated"
status of logical blocks. Since the zoned namespaces command set
specification defines that logical blocks SHALL be marked as deallocated
when the zone is in the Empty or Offline states, DULBE can only be
supported if the zone size is a multiple of the calculated deallocation
granularity (reported in NPDG) which depends on the underlying block
device cluster size (if applicable) or the configured
discard_granularity.

Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
This commit is contained in:
Klaus Jensen 2021-01-11 13:52:40 +01:00
parent 55886345d0
commit 1b5804a80d
1 changed files with 17 additions and 0 deletions
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17
hw/block/nvme-ns.c
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@ -16,6 +16,7 @@
#include "qemu/units.h"
#include "qemu/cutils.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "hw/block/block.h"
#include "hw/pci/pci.h"
#include "sysemu/sysemu.h"
@ -227,6 +228,22 @@ static void nvme_ns_init_zoned(NvmeCtrl *n, NvmeNamespace *ns, int lba_index)
ns->id_ns.ncap = ns->id_ns.nsze;
ns->id_ns.nuse = ns->id_ns.ncap;
/*
* The device uses the BDRV_BLOCK_ZERO flag to determine the "deallocated"
* status of logical blocks. Since the spec defines that logical blocks
* SHALL be deallocated when then zone is in the Empty or Offline states,
* we can only support DULBE if the zone size is a multiple of the
* calculated NPDG.
*/
if (ns->zone_size % (ns->id_ns.npdg + 1)) {
warn_report("the zone size (%"PRIu64" blocks) is not a multiple of "
"the calculated deallocation granularity (%d blocks); "
"DULBE support disabled",
ns->zone_size, ns->id_ns.npdg + 1);
ns->id_ns.nsfeat &= ~0x4;
}
ns->id_ns_zoned = id_ns_z;
}