As discussed in the mailing list this provides a framework to introduce
the feature where mkfs and btrfs-convert can set the default features
as per the given mainline kernel version.
Suggested-by: David Sterba <dsterba@xxxxxxx>
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
utils.c | 23 +++++++++++++++++++++++
utils.h | 1 +
2 files changed, 24 insertions(+)
diff --git a/utils.c b/utils.c
index 216efa6..a9b46b8 100644
--- a/utils.c
+++ b/utils.c
@@ -3222,3 +3222,26 @@ int btrfs_features_allowed_by_sysfs(u64 *features)
closedir(dir);
return 0;
}
+
+int btrfs_features_allowed_by_version(char *version, u64 *features)
+{
+ int i;
+ int code;
+ char *ver = strdup(version);
+
+ *features = 0;
+ code = version_to_code(ver);
+ free(ver);
+ if (code < 0)
+ return code;
+
+ for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
+ ver = strdup(mkfs_features[i].min_ker_ver);
+
+ if (code >= version_to_code(ver))
+ *features |= mkfs_features[i].flag;
+
+ free(ver);
+ }
+ return 0;
+}
diff --git a/utils.h b/utils.h
index cb20d73..1418e84 100644
--- a/utils.h
+++ b/utils.h
@@ -106,6 +106,7 @@ void btrfs_process_fs_features(u64 flags);
void btrfs_parse_features_to_string(char *buf, u64 flags);
u64 btrfs_features_allowed_by_kernel(void);
int btrfs_features_allowed_by_sysfs(u64 *features);
+int btrfs_features_allowed_by_version(char *version, u64 *features);
struct btrfs_mkfs_config {
char *label;
--
2.6.2
--
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