[PATCH ndctl v2 08/10] libdaxctl: add daxctl_region_destroy_dev()

[Joao Martins <joao.m.martins@oracle.com>]

Add an API to destroy an empty device.

This 'delete' sysfs attribute is only writeable for a dynamic
dax device such as the one exported by hmem.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 daxctl/lib/libdaxctl.c   | 17 +++++++++++++++++
 daxctl/lib/libdaxctl.sym |  1 +
 daxctl/libdaxctl.h       |  1 +
 3 files changed, 19 insertions(+)

diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c
index d17ff7a02bad..9b43b68facfe 100644
--- a/daxctl/lib/libdaxctl.c
+++ b/daxctl/lib/libdaxctl.c
@@ -609,6 +609,23 @@ DAXCTL_EXPORT int daxctl_region_create_dev(struct daxctl_region *region)
 	return 0;
 }
 
+DAXCTL_EXPORT int daxctl_region_destroy_dev(struct daxctl_region *region,
+					    struct daxctl_dev *dev)
+{
+	struct daxctl_ctx *ctx = daxctl_region_get_ctx(region);
+	char *path = region->region_buf;
+	int rc, len = region->buf_len;
+
+	if (snprintf(path, len, "%s/%s/delete", region->region_path, attrs) >= len) {
+		err(ctx, "%s: buffer too small!\n",
+				daxctl_region_get_devname(region));
+		return -EFAULT;
+	}
+
+	rc = sysfs_write_attr(ctx, path, daxctl_dev_get_devname(dev));
+	return rc;
+}
+
 DAXCTL_EXPORT struct daxctl_dev *daxctl_region_get_dev_seed(
 		struct daxctl_region *region)
 {
diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym
index 26987ba021ab..33c926411037 100644
--- a/daxctl/lib/libdaxctl.sym
+++ b/daxctl/lib/libdaxctl.sym
@@ -80,4 +80,5 @@ LIBDAXCTL_8 {
 global:
 	daxctl_dev_set_size;
 	daxctl_region_create_dev;
+	daxctl_region_destroy_dev;
 } LIBDAXCTL_7;
diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h
index a579ddd1d43c..2b14faad1895 100644
--- a/daxctl/libdaxctl.h
+++ b/daxctl/libdaxctl.h
@@ -61,6 +61,7 @@ struct daxctl_dev *daxctl_region_get_dev_seed(struct daxctl_region *region);
 
 struct daxctl_dev;
 struct daxctl_dev *daxctl_dev_get_first(struct daxctl_region *region);
+int daxctl_region_destroy_dev(struct daxctl_region *region, struct daxctl_dev *dev);
 struct daxctl_dev *daxctl_dev_get_next(struct daxctl_dev *dev);
 struct daxctl_region *daxctl_dev_get_region(struct daxctl_dev *dev);
 int daxctl_dev_get_id(struct daxctl_dev *dev);
-- 
1.8.3.1
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