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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-03-09 11:05:08 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-03-09 11:54:26 +0900
commite3154e9748f0f337e9f6ff9dc7d7bf24d426bd1a (patch)
treeac2a3f3dca6189b8a608571c49da66386fd1bdec /fs/nilfs2/nilfs.h
parentf7545144c2e3d280139260df934043e0a6ccce6f (diff)
downloadlinux-e3154e9748f0f337e9f6ff9dc7d7bf24d426bd1a.tar.bz2
nilfs2: get rid of nilfs_sb_info structure
This directly uses sb->s_fs_info to keep a nilfs filesystem object and fully removes the intermediate nilfs_sb_info structure. With this change, the hierarchy of on-memory structures of nilfs will be simplified as follows: Before: super_block -> nilfs_sb_info -> the_nilfs -> cptree --+-> nilfs_root (current file system) +-> nilfs_root (snapshot A) +-> nilfs_root (snapshot B) : -> nilfs_sc_info (log writer structure) After: super_block -> the_nilfs -> cptree --+-> nilfs_root (current file system) +-> nilfs_root (snapshot A) +-> nilfs_root (snapshot B) : -> nilfs_sc_info (log writer structure) The reason why we didn't design so from the beginning is because the initial shape also differed from the above. The early hierachy was composed of "per-mount-point" super_block -> nilfs_sb_info pairs and a shared nilfs object. On the kernel 2.6.37, it was changed to the current shape in order to unify super block instances into one per device, and this cleanup became applicable as the result. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/nilfs.h')
-rw-r--r--fs/nilfs2/nilfs.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index eba1aaa7fb7b..856e8e4e0b74 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -30,7 +30,6 @@
#include <linux/blkdev.h>
#include <linux/nilfs2_fs.h>
#include "the_nilfs.h"
-#include "sb.h"
#include "bmap.h"
/*
@@ -122,7 +121,7 @@ enum {
#define NILFS_SYS_INO_BITS \
((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
-#define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino)
+#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
#define NILFS_MDT_INODE(sb, ino) \
((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))