[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.a...@wdc.com>
---
 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