[PATCH ndctl v1 03/10] daxctl: add resize support in reconfigure-device

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

Add the ability to change the size of an inactive dax
device. Uses of this includes adjusting existing devices
or enterily freeing the region device to make the space
available.

	$ daxctl disable-device dax0.0
	disabled 1 device
	$ daxctl reconfigure-device -s 0 dax0.0
	reconfigured 1 device
	$ daxctl reconfigure-device -s 4G dax0.0
	reconfigured 1 device

@size (-s) and @mode (-m) are mutually exclusive as the latter relates
to assigning memory to System-RAM through kmem as opposed
to reconfiguring dynamic dax devices.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 daxctl/device.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/daxctl/device.c b/daxctl/device.c
index 705f1f8ff7f6..b483d2777ecb 100644
--- a/daxctl/device.c
+++ b/daxctl/device.c
@@ -34,6 +34,7 @@ enum dev_mode {
 };
 
 static enum dev_mode reconfig_mode = DAXCTL_DEV_MODE_UNKNOWN;
+static long long size = -1;
 static unsigned long flags;
 
 enum memory_zone {
@@ -66,6 +67,7 @@ OPT_BOOLEAN('\0', "no-movable", &param.no_movable, \
 
 static const struct option reconfig_options[] = {
 	BASE_OPTIONS(),
+	CREATE_OPTIONS(),
 	RECONFIG_OPTIONS(),
 	ZONE_OPTIONS(),
 	OPT_END(),
@@ -135,12 +137,14 @@ static const char *parse_device_options(int argc, const char **argv,
 	/* Handle action-specific options */
 	switch (action) {
 	case ACTION_RECONFIG:
-		if (!param.mode) {
-			fprintf(stderr, "error: a 'mode' option is required\n");
+		if (!param.size && !param.mode) {
+			fprintf(stderr, "error: a 'mode' or 'size' option is required\n");
 			usage_with_options(u, reconfig_options);
 			rc = -EINVAL;
 		}
-		if (strcmp(param.mode, "system-ram") == 0) {
+		if (param.size) {
+			size = __parse_size64(param.size, &units);
+		} else if (strcmp(param.mode, "system-ram") == 0) {
 			reconfig_mode = DAXCTL_DEV_MODE_RAM;
 			if (param.no_movable)
 				mem_zone = MEM_ZONE_NORMAL;
@@ -309,6 +313,17 @@ static int dev_offline_memory(struct daxctl_dev *dev)
 	return 0;
 }
 
+static int dev_resize(struct daxctl_dev *dev, unsigned long long val)
+{
+	int rc;
+
+	rc = daxctl_dev_set_size(dev, val);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
 static int disable_devdax_device(struct daxctl_dev *dev)
 {
 	struct daxctl_memory *mem = daxctl_dev_get_memory(dev);
@@ -418,6 +433,11 @@ static int do_reconfig(struct daxctl_dev *dev, enum dev_mode mode,
 	struct json_object *jdev;
 	int rc = 0;
 
+	if (size >= 0) {
+		rc = dev_resize(dev, size);
+		return rc;
+	}
+
 	switch (mode) {
 	case DAXCTL_DEV_MODE_RAM:
 		rc = reconfig_mode_system_ram(dev);
-- 
2.17.1
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