diff options
Diffstat (limited to 'drivers/nvme/target/io-cmd-bdev.c')
| -rw-r--r-- | drivers/nvme/target/io-cmd-bdev.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c index 7a1cf6437a6a..de0bff70ebb6 100644 --- a/drivers/nvme/target/io-cmd-bdev.c +++ b/drivers/nvme/target/io-cmd-bdev.c @@ -8,6 +8,45 @@ #include <linux/module.h> #include "nvmet.h" +void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id) +{ + const struct queue_limits *ql = &bdev_get_queue(bdev)->limits; + /* Number of physical blocks per logical block. */ + const u32 ppl = ql->physical_block_size / ql->logical_block_size; + /* Physical blocks per logical block, 0's based. */ + const __le16 ppl0b = to0based(ppl); + + /* + * For NVMe 1.2 and later, bit 1 indicates that the fields NAWUN, + * NAWUPF, and NACWU are defined for this namespace and should be + * used by the host for this namespace instead of the AWUN, AWUPF, + * and ACWU fields in the Identify Controller data structure. If + * any of these fields are zero that means that the corresponding + * field from the identify controller data structure should be used. + */ + id->nsfeat |= 1 << 1; + id->nawun = ppl0b; + id->nawupf = ppl0b; + id->nacwu = ppl0b; + + /* + * Bit 4 indicates that the fields NPWG, NPWA, NPDG, NPDA, and + * NOWS are defined for this namespace and should be used by + * the host for I/O optimization. + */ + id->nsfeat |= 1 << 4; + /* NPWG = Namespace Preferred Write Granularity. 0's based */ + id->npwg = ppl0b; + /* NPWA = Namespace Preferred Write Alignment. 0's based */ + id->npwa = id->npwg; + /* NPDG = Namespace Preferred Deallocate Granularity. 0's based */ + id->npdg = to0based(ql->discard_granularity / ql->logical_block_size); + /* NPDG = Namespace Preferred Deallocate Alignment */ + id->npda = id->npdg; + /* NOWS = Namespace Optimal Write Size */ + id->nows = to0based(ql->io_opt / ql->logical_block_size); +} + int nvmet_bdev_ns_enable(struct nvmet_ns *ns) { int ret; |