nilfs2: do not allocate multiple super block instances for a device

This stops allocating multiple super block instances for a device.

All snapshots and a current mode mount (i.e. latest tree) will be
controlled with nilfs_root objects that are kept within an sb
instance.

nilfs_get_sb() is rewritten so that it always has a root object for
the latest tree and snapshots make additional root objects.

The root dentry of the latest tree is binded to sb->s_root even if it
isn't attached on a directory.  Root dentries of snapshots or the
latest tree are binded to mnt->mnt_root on which they are mounted.

With this patch, nilfs_find_sbinfo() function, nilfs->ns_supers list,
and nilfs->ns_current back pointer, are deleted.  In addition,
init_nilfs() and load_nilfs() are simplified since they will be called
once for a device, not repeatedly called for mount points.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 0 insertions, 5 deletions

diff --git a/fs/nilfs2/sb.h b/fs/nilfs2/sb.h
index 3cc3675c3abe..35a07157b980 100644
--- a/fs/nilfs2/sb.h
+++ b/fs/nilfs2/sb.h
@@ -42,9 +42,6 @@ struct nilfs_sc_info;
  * NILFS super-block data in memory
  */
 struct nilfs_sb_info {
-        /* Snapshot status */
-        __u64 s_snapshot_cno;           /* Checkpoint number */
-
         /* Mount options */
         unsigned long s_mount_opt;
         uid_t s_resuid;
@@ -57,8 +54,6 @@ struct nilfs_sb_info {
         /* Fundamental members */
         struct super_block *s_super;    /* reverse pointer to super_block */
         struct the_nilfs *s_nilfs;
-        struct list_head s_list;        /* list head for nilfs->ns_supers */
-        atomic_t s_count;               /* reference count */
 
         /* Segment constructor */
         struct list_head s_dirty_files; /* dirty files list */