From 54064e51d1e2c85e08ab64f05d12957ff65dfcd3 Mon Sep 17 00:00:00 2001 From: Klaus Jensen Date: Wed, 14 Oct 2020 09:55:08 +0200 Subject: hw/block/nvme: add dulbe support Add support for reporting the Deallocated or Unwritten Logical Block Error (DULBE). Rely on the block status flags reported by the block layer and consider any block with the BDRV_BLOCK_ZERO flag to be deallocated. Multiple factors affect when a Write Zeroes command result in deallocation of blocks. * the underlying file system block size * the blockdev format * the 'discard' and 'logical_block_size' parameters format | discard | wz (512B) wz (4KiB) wz (64KiB) ----------------------------------------------------- qcow2 ignore n n y qcow2 unmap n n y raw ignore n y y raw unmap n y y So, this works best with an image in raw format and 4KiB LBAs, since holes can then be punched on a per-block basis (this assumes a file system with a 4kb block size, YMMV). A qcow2 image, uses a cluster size of 64KiB by default and blocks will only be marked deallocated if a full cluster is zeroed or discarded. However, this *is* consistent with the spec since Write Zeroes "should" deallocate the block if the Deallocate attribute is set and "may" deallocate if the Deallocate attribute is not set. Thus, we always try to deallocate (the BDRV_REQ_MAY_UNMAP flag is always set). Signed-off-by: Klaus Jensen Reviewed-by: Keith Busch --- include/block/nvme.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/block') diff --git a/include/block/nvme.h b/include/block/nvme.h index 3e02d9ca98..b663d11e60 100644 --- a/include/block/nvme.h +++ b/include/block/nvme.h @@ -693,6 +693,7 @@ enum NvmeStatusCodes { NVME_E2E_REF_ERROR = 0x0284, NVME_CMP_FAILURE = 0x0285, NVME_ACCESS_DENIED = 0x0286, + NVME_DULB = 0x0287, NVME_MORE = 0x2000, NVME_DNR = 0x4000, NVME_NO_COMPLETE = 0xffff, @@ -909,6 +910,9 @@ enum NvmeIdCtrlLpa { #define NVME_AEC_NS_ATTR(aec) ((aec >> 8) & 0x1) #define NVME_AEC_FW_ACTIVATION(aec) ((aec >> 9) & 0x1) +#define NVME_ERR_REC_TLER(err_rec) (err_rec & 0xffff) +#define NVME_ERR_REC_DULBE(err_rec) (err_rec & 0x10000) + enum NvmeFeatureIds { NVME_ARBITRATION = 0x1, NVME_POWER_MANAGEMENT = 0x2, @@ -1029,6 +1033,7 @@ enum NvmeNsIdentifierType { #define NVME_ID_NS_NSFEAT_THIN(nsfeat) ((nsfeat & 0x1)) +#define NVME_ID_NS_NSFEAT_DULBE(nsfeat) ((nsfeat >> 2) & 0x1) #define NVME_ID_NS_FLBAS_EXTENDED(flbas) ((flbas >> 4) & 0x1) #define NVME_ID_NS_FLBAS_INDEX(flbas) ((flbas & 0xf)) #define NVME_ID_NS_MC_SEPARATE(mc) ((mc >> 1) & 0x1) -- cgit v1.2.3-55-g7522