1 files changed, 19 insertions, 1 deletions

diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index de8cc53b4a5c..d01ead1bea9a 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -33,6 +33,7 @@
 #include <linux/slab.h>
 
 struct nilfs_sc_info;
+struct nilfs_sysfs_dev_subgroups;
 
 /* the_nilfs struct */
 enum {
@@ -54,6 +55,7 @@ enum {
  * @ns_sbwcount: write count of super block
  * @ns_sbsize: size of valid data in super block
  * @ns_mount_state: file system state
+ * @ns_sb_update_freq: interval of periodical update of superblocks (in seconds)
  * @ns_seg_seq: segment sequence counter
  * @ns_segnum: index number of the latest full segment.
  * @ns_nextnum: index number of the full segment index to be used next
@@ -95,6 +97,9 @@ enum {
  * @ns_inode_size: size of on-disk inode
  * @ns_first_ino: first not-special inode number
  * @ns_crc_seed: seed value of CRC32 calculation
+ * @ns_dev_kobj: /sys/fs/<nilfs>/<device>
+ * @ns_dev_kobj_unregister: completion state
+ * @ns_dev_subgroups: <device> subgroups pointer
  */
 struct the_nilfs {
         unsigned long           ns_flags;
@@ -114,6 +119,7 @@ struct the_nilfs {
         unsigned                ns_sbwcount;
         unsigned                ns_sbsize;
         unsigned                ns_mount_state;
+        unsigned                ns_sb_update_freq;
 
         /*
          * Following fields are dedicated to a writable FS-instance.
@@ -188,6 +194,11 @@ struct the_nilfs {
         int                     ns_inode_size;
         int                     ns_first_ino;
         u32                     ns_crc_seed;
+
+        /* /sys/fs/<nilfs>/<device> */
+        struct kobject ns_dev_kobj;
+        struct completion ns_dev_kobj_unregister;
+        struct nilfs_sysfs_dev_subgroups *ns_dev_subgroups;
 };
 
 #define THE_NILFS_FNS(bit, name)                                        \
@@ -232,6 +243,8 @@ THE_NILFS_FNS(SB_DIRTY, sb_dirty)
  * @ifile: inode file
  * @inodes_count: number of inodes
  * @blocks_count: number of blocks
+ * @snapshot_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot>
+ * @snapshot_kobj_unregister: completion state for kernel object
  */
 struct nilfs_root {
         __u64 cno;
@@ -243,6 +256,10 @@ struct nilfs_root {
 
         atomic64_t inodes_count;
         atomic64_t blocks_count;
+
+        /* /sys/fs/<nilfs>/<device>/mounted_snapshots/<snapshot> */
+        struct kobject snapshot_kobj;
+        struct completion snapshot_kobj_unregister;
 };
 
 /* Special checkpoint number */
@@ -254,7 +271,8 @@ struct nilfs_root {
 static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
 {
         u64 t = get_seconds();
-        return t < nilfs->ns_sbwtime || t > nilfs->ns_sbwtime + NILFS_SB_FREQ;
+        return t < nilfs->ns_sbwtime ||
+                t > nilfs->ns_sbwtime + nilfs->ns_sb_update_freq;
 }
 
 static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)