nilfs2: get rid of mi_nilfs back pointer to nilfs object

This removes a back pointer to nilfs object from nilfs_mdt_info
structure that is attached to metadata files.

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

4 files changed, 8 insertions, 15 deletions

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 44326cfe1fa9..32695f3c4b9a 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -78,7 +78,7 @@ static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
                                                      struct buffer_head *,
                                                      void *))
 {
-        struct the_nilfs *nilfs = NILFS_MDT(inode)->mi_nilfs;
+        struct the_nilfs *nilfs = NILFS_I_NILFS(inode);
         struct super_block *sb = inode->i_sb;
         struct nilfs_transaction_info ti;
         struct buffer_head *bh;
@@ -167,9 +167,7 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
                 unlock_buffer(bh);
                 goto failed_bh;
         }
-        bh->b_bdev = NILFS_MDT(inode)->mi_nilfs->ns_bdev;
-        bh->b_blocknr = (sector_t)blknum;
-        set_buffer_mapped(bh);
+        map_bh(bh, inode->i_sb, (sector_t)blknum);
 
         bh->b_end_io = end_buffer_read_sync;
         get_bh(bh);
@@ -412,7 +410,7 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
                 return 0;
 
         sb = inode->i_sb;
-        nilfs = NILFS_MDT(inode)->mi_nilfs;
+        nilfs = NILFS_SB(sb)->s_nilfs;
 
         if (!sb) {
                 down_read(&nilfs->ns_writer_sem);
@@ -452,7 +450,6 @@ int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz)
         if (!mi)
                 return -ENOMEM;
 
-        mi->mi_nilfs = NILFS_I_NILFS(inode);
         init_rwsem(&mi->mi_sem);
         inode->i_private = mi;
 
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h
index 73ff7c055715..76356d2899ed 100644
--- a/fs/nilfs2/mdt.h
+++ b/fs/nilfs2/mdt.h
@@ -37,7 +37,6 @@ struct nilfs_shadow_map {
 
 /**
  * struct nilfs_mdt_info - on-memory private data of meta data files
- * @mi_nilfs: back pointer to the_nilfs struct
  * @mi_sem: reader/writer semaphore for meta data operations
  * @mi_bgl: per-blockgroup locking
  * @mi_entry_size: size of an entry
@@ -49,7 +48,6 @@ struct nilfs_shadow_map {
  * @mi_blocks_per_desc_block: number of blocks per descriptor block
  */
 struct nilfs_mdt_info {
-        struct the_nilfs       *mi_nilfs;
         struct rw_semaphore     mi_sem;
         struct blockgroup_lock *mi_bgl;
         unsigned                mi_entry_size;
@@ -68,9 +66,7 @@ static inline struct nilfs_mdt_info *NILFS_MDT(const struct inode *inode)
 
 static inline struct the_nilfs *NILFS_I_NILFS(struct inode *inode)
 {
-        struct super_block *sb = inode->i_sb;
-
-        return sb ? NILFS_SB(sb)->s_nilfs : NILFS_MDT(inode)->mi_nilfs;
+        return NILFS_SB(inode->i_sb)->s_nilfs;
 }
 
 /* Default GFP flags using highmem */
@@ -117,7 +113,7 @@ static inline void nilfs_mdt_clear_dirty(struct inode *inode)
 
 static inline __u64 nilfs_mdt_cno(struct inode *inode)
 {
-        return NILFS_MDT(inode)->mi_nilfs->ns_cno;
+        return NILFS_I_NILFS(inode)->ns_cno;
 }
 
 #define nilfs_mdt_bgl_lock(inode, bg) \
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 599d9c27761e..1d6f488ccae8 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -505,7 +505,7 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
 {
         struct buffer_head *header_bh;
         struct nilfs_sufile_header *header;
-        struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
+        struct the_nilfs *nilfs = NILFS_I_NILFS(sufile);
         void *kaddr;
         int ret;
 
@@ -583,7 +583,7 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
         struct nilfs_segment_usage *su;
         struct nilfs_suinfo *si = buf;
         size_t susz = NILFS_MDT(sufile)->mi_entry_size;
-        struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
+        struct the_nilfs *nilfs = NILFS_I_NILFS(sufile);
         void *kaddr;
         unsigned long nsegs, segusages_per_block;
         ssize_t n;
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h
index 203f6102a62f..a943fbacb45b 100644
--- a/fs/nilfs2/sufile.h
+++ b/fs/nilfs2/sufile.h
@@ -31,7 +31,7 @@
 
 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
 {
-        return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
+        return NILFS_I_NILFS(sufile)->ns_nsegments;
 }
 
 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);