Use sysfs attribute files to get the long value of zoned device
information.
Signed-off-by: Sam Li <faithilike...@gmail.com>
Reviewed-by: Hannes Reinecke <h...@suse.de>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
block/file-posix.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/block/file-posix.c b/block/file-posix.c
index c07ac4c697..727389488c 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1258,6 +1258,33 @@ static int get_sysfs_zoned_model(struct stat *st,
BlockZoneModel *zoned) {
return 0;
}
+/*
+ * Get zoned device information (chunk_sectors, zoned_append_max_bytes,
+ * max_open_zones, max_active_zones) through sysfs attribute files.
+ */
+static long get_sysfs_long_val(struct stat *st, const char *attribute) {
+#ifdef CONFIG_LINUX
+ g_autofree char *str = NULL;
+ const char *end;
+ long val;
+ int ret;
+
+ ret = get_sysfs_str_val(st, attribute, &str);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* The file is ended with '\n', pass 'end' to accept that. */
+ ret = qemu_strtol(str, &end, 10, &val);
+ if (ret == 0 && end && *end == '\n') {
+ ret = val;
+ }
+ return ret;
+#else
+ return -ENOTSUP;
+#endif
+}
+
static int hdev_get_max_segments(int fd, struct stat *st) {
int ret;
if (S_ISCHR(st->st_mode)) {
--
2.37.1
