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nilfs2: introduce secondary super block

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The former versions didn't have extra super blocks.  This improves the
weak point by introducing another super block at unused region in tail of
the partition.

This doesn't break disk format compatibility; older versions just ingore
the secondary super block, and new versions just recover it if it doesn't
exist.  The partition created by an old mkfs may not have unused region,
but in that case, the secondary super block will not be added.

This doesn't make more redundant copies of the super block; it is a future
work.

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>
This commit is contained in:
Ryusuke Konishi
2009-04-06 19:01:59 -07:00
committed by Linus Torvalds
parent cece552074
commit e339ad31f5
8 changed files with 274 additions and 175 deletions
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2
fs/nilfs2/segment.h
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@@ -206,8 +206,6 @@ enum {
logical segment with a super root */
#define NILFS_SC_DEFAULT_SR_FREQ 30 /* Maximum frequency of super root
creation */
#define NILFS_SC_DEFAULT_SB_FREQ 30 /* Minimum interval of periodical
update of superblock (reserved) */
/*
* The default threshold amount of data, in block counts.