diff options
| author | NeilBrown <neilb@suse.de> | 2006-06-26 00:27:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:39 -0700 |
| commit | 42543769142d2375f2b5f8fc9cac999f84bd4c4c (patch) | |
| tree | 404606c37da872639111c5b641f07fff2ded1dff /include/linux | |
| parent | 07d84d109d8beedd68df9da2e4e9f25c8217e7fb (diff) | |
[PATCH] md: Don't write dirty/clean update to spares - leave them alone
- record the 'event' count on each individual device (they
might sometimes be slightly different now)
- add a new value for 'sb_dirty': '3' means that the super
block only needs to be updated to record a clean<->dirty
transition.
- Prefer odd event numbers for dirty states and even numbers
for clean states
- Using all the above, don't update the superblock on
a spare device if the update is just doing a clean-dirty
transition. To accomodate this, a transition from
dirty back to clean might now decrement the events counter
if nothing else has changed.
The net effect of this is that spare drives will not see any IO requests
during normal running of the array, so they can go to sleep if that is what
they want to do.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/raid/md_k.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h index 682574f3bd3..c1e0ac55bab 100644 --- a/include/linux/raid/md_k.h +++ b/include/linux/raid/md_k.h @@ -58,6 +58,7 @@ struct mdk_rdev_s struct page *sb_page; int sb_loaded; + __u64 sb_events; sector_t data_offset; /* start of data in array */ sector_t sb_offset; int sb_size; /* bytes in the superblock */ |