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libnvdimm: write pmem label set

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After 'uuid', 'size', and optionally 'alt_name' have been set to valid
values the labels on the dimms can be updated.

Write procedure is:
1/ Allocate and write new labels in the "next" index
2/ Free the old labels in the working copy
3/ Write the bitmap and the label space on the dimm
4/ Write the index to make the update valid

Label ranges directly mirror the dpa resource values for the given
label_id of the namespace.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2015-05-30 12:36:02 -04:00
parent 1b40e09a12
commit f524bf271a
5 changed files with 455 additions and 14 deletions
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49
drivers/nvdimm/dimm_devs.c
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@@ -132,6 +132,55 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
return rc;
}
int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
void *buf, size_t len)
{
int rc = validate_dimm(ndd);
size_t max_cmd_size, buf_offset;
struct nd_cmd_set_config_hdr *cmd;
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
if (rc)
return rc;
if (!ndd->data)
return -ENXIO;
if (offset + len > ndd->nsarea.config_size)
return -ENXIO;
max_cmd_size = min_t(u32, PAGE_SIZE, len);
max_cmd_size = min_t(u32, max_cmd_size, ndd->nsarea.max_xfer);
cmd = kzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
if (!cmd)
return -ENOMEM;
for (buf_offset = 0; len; len -= cmd->in_length,
buf_offset += cmd->in_length) {
size_t cmd_size;
u32 *status;
cmd->in_offset = offset + buf_offset;
cmd->in_length = min(max_cmd_size, len);
memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
/* status is output in the last 4-bytes of the command buffer */
cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
status = ((void *) cmd) + cmd_size - sizeof(u32);
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_SET_CONFIG_DATA, cmd, cmd_size);
if (rc || *status) {
rc = rc ? rc : -ENXIO;
break;
}
}
kfree(cmd);
return rc;
}
static void nvdimm_release(struct device *dev)
{
struct nvdimm *nvdimm = to_nvdimm(dev);