This patch adds three new attributes to the nilfs object, which contain
a copy of the feature flags from the super block. This can be used, to
efficiently test whether file system feature flags are set or not.
Signed-off-by: Andreas Rohner <andreas.rohner@xxxxxxx>
---
fs/nilfs2/the_nilfs.c | 4 ++++
fs/nilfs2/the_nilfs.h | 8 ++++++++
2 files changed, 12 insertions(+)
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index 69bd801..606fdfc 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -630,6 +630,10 @@ int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data)
get_random_bytes(&nilfs->ns_next_generation,
sizeof(nilfs->ns_next_generation));
+ nilfs->ns_feature_compat = le64_to_cpu(sbp->s_feature_compat);
+ nilfs->ns_feature_compat_ro = le64_to_cpu(sbp->s_feature_compat_ro);
+ nilfs->ns_feature_incompat = le64_to_cpu(sbp->s_feature_incompat);
+
err = nilfs_store_disk_layout(nilfs, sbp);
if (err)
goto failed_sbh;
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 23778d3..12cd91d 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -101,6 +101,9 @@ enum {
* @ns_dev_kobj: /sys/fs/<nilfs>/<device>
* @ns_dev_kobj_unregister: completion state
* @ns_dev_subgroups: <device> subgroups pointer
+ * @ns_feature_compat: Compatible feature set
+ * @ns_feature_compat_ro: Read-only compatible feature set
+ * @ns_feature_incompat: Incompatible feature set
*/
struct the_nilfs {
unsigned long ns_flags;
@@ -201,6 +204,11 @@ struct the_nilfs {
struct kobject ns_dev_kobj;
struct completion ns_dev_kobj_unregister;
struct nilfs_sysfs_dev_subgroups *ns_dev_subgroups;
+
+ /* Features */
+ __u64 ns_feature_compat;
+ __u64 ns_feature_compat_ro;
+ __u64 ns_feature_incompat;
};
#define THE_NILFS_FNS(bit, name) \
--
2.3.7
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