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nvmet: revalidate-ns & generate AEN from configfs 

Add a new attribute "revalidate_size" for the namespace which allows
user to revalidate and generate the AEN if needed. This attribute is
needed so that we can install userspace rules with systemd service based
on inotify/fsnotify/uevent. The registered callback for such a service
will end up writing to this attribute to generate AEN if needed.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimbeg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2020-05-19 01:06:29 -07:00 committed by Christoph Hellwig
parent de124f4273
commit 1f357548ec
1 changed files with 26 additions and 0 deletions
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26
drivers/nvme/target/configfs.c
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@ -540,6 +540,31 @@ static ssize_t nvmet_ns_buffered_io_store(struct config_item *item,
CONFIGFS_ATTR(nvmet_ns_, buffered_io);
static ssize_t nvmet_ns_revalidate_size_store(struct config_item *item,
const char *page, size_t count)
{
struct nvmet_ns *ns = to_nvmet_ns(item);
bool val;
if (strtobool(page, &val))
return -EINVAL;
if (!val)
return -EINVAL;
mutex_lock(&ns->subsys->lock);
if (!ns->enabled) {
pr_err("enable ns before revalidate.\n");
mutex_unlock(&ns->subsys->lock);
return -EINVAL;
}
nvmet_ns_revalidate(ns);
mutex_unlock(&ns->subsys->lock);
return count;
}
CONFIGFS_ATTR_WO(nvmet_ns_, revalidate_size);
static struct configfs_attribute *nvmet_ns_attrs[] = {
&nvmet_ns_attr_device_path,
&nvmet_ns_attr_device_nguid,
@ -547,6 +572,7 @@ static struct configfs_attribute *nvmet_ns_attrs[] = {
&nvmet_ns_attr_ana_grpid,
&nvmet_ns_attr_enable,
&nvmet_ns_attr_buffered_io,
&nvmet_ns_attr_revalidate_size,
#ifdef CONFIG_PCI_P2PDMA
&nvmet_ns_attr_p2pmem,
#endif