nilfs2: embed a back pointer to super block instance in nilfs object
Insert a back pointer to super block instance in nilfs object so that
functions of nilfs2 easily refer to the super block instance. This
simplifies replacement of printk() in the successive change.
Link: http://lkml.kernel.org/r/1464875891-5443-4-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 86e3c00..2d4d0be 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -1076,7 +1076,7 @@
__u64 cno;
int err;
- nilfs = alloc_nilfs(sb->s_bdev);
+ nilfs = alloc_nilfs(sb);
if (!nilfs)
return -ENOMEM;
diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c
index e9fd241..7021151 100644
--- a/fs/nilfs2/the_nilfs.c
+++ b/fs/nilfs2/the_nilfs.c
@@ -56,12 +56,12 @@
/**
* alloc_nilfs - allocate a nilfs object
- * @bdev: block device to which the_nilfs is related
+ * @sb: super block instance
*
* Return Value: On success, pointer to the_nilfs is returned.
* On error, NULL is returned.
*/
-struct the_nilfs *alloc_nilfs(struct block_device *bdev)
+struct the_nilfs *alloc_nilfs(struct super_block *sb)
{
struct the_nilfs *nilfs;
@@ -69,7 +69,8 @@
if (!nilfs)
return NULL;
- nilfs->ns_bdev = bdev;
+ nilfs->ns_sb = sb;
+ nilfs->ns_bdev = sb->s_bdev;
atomic_set(&nilfs->ns_ndirtyblks, 0);
init_rwsem(&nilfs->ns_sem);
mutex_init(&nilfs->ns_snapshot_mount_mutex);
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index 79369fd..79d1421 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -43,6 +43,7 @@
* struct the_nilfs - struct to supervise multiple nilfs mount points
* @ns_flags: flags
* @ns_flushed_device: flag indicating if all volatile data was flushed
+ * @ns_sb: back pointer to super block instance
* @ns_bdev: block device
* @ns_sem: semaphore for shared states
* @ns_snapshot_mount_mutex: mutex to protect snapshot mounts
@@ -102,6 +103,7 @@
unsigned long ns_flags;
int ns_flushed_device;
+ struct super_block *ns_sb;
struct block_device *ns_bdev;
struct rw_semaphore ns_sem;
struct mutex ns_snapshot_mount_mutex;
@@ -281,7 +283,7 @@
}
void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
-struct the_nilfs *alloc_nilfs(struct block_device *bdev);
+struct the_nilfs *alloc_nilfs(struct super_block *sb);
void destroy_nilfs(struct the_nilfs *nilfs);
int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data);
int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb);