To check whether a block device is zoned or not, is_zoned_device()
returns true when /sys/block/<device>/queue/chunk_sectors is not zero.
Now there are devices which are not zoned devices but has non-zero
chunk-sectors values. For such situation, the more accurate method is
to read file /sys/block/<device>/queue/zoned. If the content is not
string "none", this device is not a zoned device. Otherwise (e.g.
"host-aware" or "host- managed"), it is a zoned device.
For elder kernel if the above sysfs file doesn't exist, get_zone_size()
is still called by is_zoned_device() for compatibility.
Signed-off-by: Coly Li <colyli@xxxxxxx>
---
zoned.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/zoned.c b/zoned.c
index d078286..f214787 100644
--- a/zoned.c
+++ b/zoned.c
@@ -90,5 +90,24 @@ void check_data_offset_for_zoned_device(char *devname,
int is_zoned_device(char *devname)
{
+ char str[128];
+ FILE *file;
+ int res;
+
+ snprintf(str, sizeof(str),
+ "/sys/block/%s/queue/zoned",
+ basename(devname));
+ file = fopen(str, "r");
+ if (file) {
+ memset(str, 0, sizeof(str));
+ res = fscanf(file, "%s", str);
+ fclose(file);
+
+ /* "none" indicates non-zoned device */
+ if (res == 1)
+ return !(strcmp(str, "none") == 0);
+ }
+
+ /* Only used when "zoned" file doesn't exist */
return (get_zone_size(devname) != 0);
}
--
2.39.1
