[PATCH v2 1/9] nilfs2: copy file system feature flags to the nilfs object

[Andreas Rohner <andreas.rohner-hi6Y0CQ0nG0@public.gmane.org>]

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-hi6Y0CQ0nG0@public.gmane.org>
---
 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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