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[PATCH] md: Only checkpoint expansion progress occasionally

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Instead of checkpointing at each stripe, only checkpoint when a new write
would overwrite uncheckpointed data.  Block any write to the uncheckpointed
area.  Arbitrarily checkpoint at least every 3Meg.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-03-27 01:18:12 -08:00 • committed by Linus Torvalds
commit b578d55fdd
2 changed files with 44 additions and 10 deletions
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3
include/linux/raid/raid5.h
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@ -217,6 +217,9 @@ struct raid5_private_data {
/* used during an expand */
sector_t expand_progress; /* MaxSector when no expand happening */
sector_t expand_lo; /* from here up to expand_progress it out-of-bounds
* as we haven't flushed the metadata yet
*/
int previous_raid_disks;
struct list_head handle_list; /* stripes needing handling */