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nilfs2: introduce nilfs_prepare_super

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This function checks validity of super block pointers.
If first super block is invalid, it will swap the super blocks.
The function should be called before any super block information updates.
Caller must obtain nilfs->ns_sem.

Signed-off-by: Jiro SEKIBA <jir@unicus.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Jiro SEKIBA
2010-06-28 17:49:32 +09:00
committed by Ryusuke Konishi
parent 60f46b7efc
commit d26493b6f0
3 changed files with 62 additions and 28 deletions
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fs/nilfs2/nilfs.h
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@@ -272,6 +272,7 @@ extern int nilfs_store_magic_and_option(struct super_block *,
struct nilfs_super_block *, char *);
extern void nilfs_set_log_cursor(struct nilfs_super_block *,
struct the_nilfs *);
extern struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *);
extern int nilfs_commit_super(struct nilfs_sb_info *, int);
extern int nilfs_cleanup_super(struct nilfs_sb_info *);
extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);