[PATCH 12/12] btrfs-progs: introduce support for dev-place HMZONED device

[Naohiro Aota]

This patch check if the target file system is flagged as HMZONED. If it is,
the device to be added is flagged PREP_DEVICE_HMZONED.  Also add checks to
prevent mixing non-zoned devices and zoned devices.

Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
---
 cmds-replace.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/cmds-replace.c b/cmds-replace.c
index 713d200938d4..c752ceaadb77 100644
--- a/cmds-replace.c
+++ b/cmds-replace.c
@@ -116,6 +116,7 @@ static const char *const cmd_replace_start_usage[] = {
 
 static int cmd_replace_start(int argc, char **argv)
 {
+	struct btrfs_ioctl_feature_flags feature_flags;
 	struct btrfs_ioctl_dev_replace_args start_args = {0};
 	struct btrfs_ioctl_dev_replace_args status_args = {0};
 	int ret;
@@ -123,6 +124,7 @@ static int cmd_replace_start(int argc, char **argv)
 	int c;
 	int fdmnt = -1;
 	int fddstdev = -1;
+	int hmzoned;
 	char *path;
 	char *srcdev;
 	char *dstdev = NULL;
@@ -163,6 +165,13 @@ static int cmd_replace_start(int argc, char **argv)
 	if (fdmnt < 0)
 		goto leave_with_error;
 
+	ret = ioctl(fdmnt, BTRFS_IOC_GET_FEATURES, &feature_flags);
+	if (ret) {
+		error("ioctl(GET_FEATURES) on '%s' returns error: %m", path);
+		goto leave_with_error;
+	}
+	hmzoned = feature_flags.incompat_flags & BTRFS_FEATURE_INCOMPAT_HMZONED;
+
 	/* check for possible errors before backgrounding */
 	status_args.cmd = BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS;
 	status_args.result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_RESULT;
@@ -257,7 +266,8 @@ static int cmd_replace_start(int argc, char **argv)
 	strncpy((char *)start_args.start.tgtdev_name, dstdev,
 		BTRFS_DEVICE_PATH_NAME_MAX);
 	ret = btrfs_prepare_device(fddstdev, dstdev, &dstdev_block_count, 0,
-			PREP_DEVICE_ZERO_END | PREP_DEVICE_VERBOSE);
+			PREP_DEVICE_ZERO_END | PREP_DEVICE_VERBOSE |
+			(hmzoned ? PREP_DEVICE_HMZONED | PREP_DEVICE_DISCARD : 0));
 	if (ret)
 		goto leave_with_error;
 
-- 
2.21.0