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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-04-07 04:01:59 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 17:31:20 +0200
commite339ad31f59925b48a92ee3947692fdf9758b8c7 (patch)
tree6bb85c43bfd100b0a220c788c654f2f74ca553e4 /fs/nilfs2/segment.h
parentnilfs2: simplify handling of active state of segments (diff)
downloadlinux-e339ad31f59925b48a92ee3947692fdf9758b8c7.tar.xz
linux-e339ad31f59925b48a92ee3947692fdf9758b8c7.zip
nilfs2: introduce secondary super block
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>
Diffstat (limited to 'fs/nilfs2/segment.h')
-rw-r--r--fs/nilfs2/segment.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index 4a64eb82f1f5..a98fc1ed0bbb 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -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.