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NVMe: Add revalidate_disk callback 

This adds a callback to revalidate the disk and change its block size
and capacity if needed. Before, a user would have to remove + rescan
an entire device if they changed the logical block size using an NVMe
Format or other vendor specific command; now they can just run something
that issues the BLKRRPART IOCTL, like

 # hdparm -z /dev/nvmeXnY

This can also be used in response to the 1.2 Spec's Namespace Attribute
Change asynchronous event.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2014-09-10 17:21:14 -06:00 committed by Jens Axboe
parent 7be50e93fb
commit 1b9dbf7fe0
1 changed files with 30 additions and 0 deletions
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30
drivers/block/nvme-core.c
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@ -1853,6 +1853,35 @@ static int nvme_getgeo(struct block_device *bd, struct hd_geometry *geo)
return 0;
}
static int nvme_revalidate_disk(struct gendisk *disk)
{
struct nvme_ns *ns = disk->private_data;
struct nvme_dev *dev = ns->dev;
struct nvme_id_ns *id;
dma_addr_t dma_addr;
int lbaf;
id = dma_alloc_coherent(&dev->pci_dev->dev, 4096, &dma_addr,
GFP_KERNEL);
if (!id) {
dev_warn(&dev->pci_dev->dev, "%s: Memory alocation failure\n",
__func__);
return 0;
}
if (nvme_identify(dev, ns->ns_id, 0, dma_addr))
goto free;
lbaf = id->flbas & 0xf;
ns->lba_shift = id->lbaf[lbaf].ds;
blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
free:
dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr);
return 0;
}
static const struct block_device_operations nvme_fops = {
.owner = THIS_MODULE,
.ioctl = nvme_ioctl,
@ -1860,6 +1889,7 @@ static const struct block_device_operations nvme_fops = {
.open = nvme_open,
.release = nvme_release,
.getgeo = nvme_getgeo,
.revalidate_disk= nvme_revalidate_disk,
};
static void nvme_resubmit_iods(struct nvme_queue *nvmeq)