nilfs2: always set back pointer to host inode in mapping->host

In the current nilfs, page cache for btree nodes and meta data files
do not set a valid back pointer to the host inode in mapping->host.

This will change it so that every address space in nilfs uses
mapping->host to hold its host inode.

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

1 files changed, 5 insertions, 11 deletions

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 186cabbe54d7..eeb1bc2c76ca 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -655,13 +655,10 @@ static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
                 if (unlikely(page->index > last))
                         break;
 
-                if (mapping->host) {
-                        lock_page(page);
-                        if (!page_has_buffers(page))
-                                create_empty_buffers(page,
-                                                     1 << inode->i_blkbits, 0);
-                        unlock_page(page);
-                }
+                lock_page(page);
+                if (!page_has_buffers(page))
+                        create_empty_buffers(page, 1 << inode->i_blkbits, 0);
+                unlock_page(page);
 
                 bh = head = page_buffers(page);
                 do {
@@ -1503,10 +1500,7 @@ nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
                         nblocks = le32_to_cpu(finfo->fi_nblocks);
                         ndatablk = le32_to_cpu(finfo->fi_ndatablk);
 
-                        if (buffer_nilfs_node(bh))
-                                inode = NILFS_BTNC_I(bh->b_page->mapping);
-                        else
-                                inode = NILFS_AS_I(bh->b_page->mapping);
+                        inode = bh->b_page->mapping->host;
 
                         if (mode == SC_LSEG_DSYNC)
                                 sc_op = &nilfs_sc_dsync_ops;