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Introduce exp_obj serial

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This is meant to be used by lvm2 to recognize which one of the stacked
devices should be used (be it backend device, or one of the bottom levels
in multi-level cache configuration).

Signed-off-by: Robert Baldyga <robert.baldyga@open-cas.com>
This commit is contained in:
Robert Baldyga 2024-10-19 20:59:54 +02:00
parent 7a3b0672f2
commit b6f604d4a9
1 changed files with 29 additions and 0 deletions
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29
modules/cas_cache/exp_obj.c
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@ -388,6 +388,29 @@ static int _cas_exp_obj_check_path(const char *dev_name)
return result; return result;
} }
static ssize_t device_attr_serial_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *gd = dev_to_disk(dev);
struct cas_disk *dsk = gd->private_data;
struct cas_exp_obj *exp_obj = dsk->exp_obj;
return sysfs_emit(buf, "opencas-%s", exp_obj->dev_name);
}
static struct device_attribute device_attr_serial =
__ATTR(serial, 0444, device_attr_serial_show, NULL);
static struct attribute *device_attrs[] = {
&device_attr_serial.attr,
NULL,
};
static const struct attribute_group device_attr_group = {
.attrs = device_attrs,
.name = "device",
};
int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name, int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
struct module *owner, struct cas_exp_obj_ops *ops, void *priv) struct module *owner, struct cas_exp_obj_ops *ops, void *priv)
{ {
@ -476,6 +499,10 @@ int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
if (cas_add_disk(gd)) if (cas_add_disk(gd))
goto error_add_disk; goto error_add_disk;
result = sysfs_create_group(&disk_to_dev(gd)->kobj, &device_attr_group);
if (result)
goto error_sysfs;
result = bd_claim_by_disk(cas_disk_get_blkdev(dsk), dsk, gd); result = bd_claim_by_disk(cas_disk_get_blkdev(dsk), dsk, gd);
if (result) if (result)
goto error_bd_claim; goto error_bd_claim;
@ -483,6 +510,8 @@ int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
return 0; return 0;
error_bd_claim: error_bd_claim:
sysfs_remove_group(&disk_to_dev(gd)->kobj, &device_attr_group);
error_sysfs:
del_gendisk(dsk->exp_obj->gd); del_gendisk(dsk->exp_obj->gd);
error_add_disk: error_add_disk:
error_set_geometry: error_set_geometry: