From b47490c9bc73d0b34e4c194db40de183e592e446 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 6 Feb 2008 01:39:50 -0800 Subject: md: Update md bitmap during resync. Currently an md array with a write-intent bitmap does not updated that bitmap to reflect successful partial resync. Rather the entire bitmap is updated when the resync completes. This is because there is no guarentee that resync requests will complete in order, and tracking each request individually is unnecessarily burdensome. However there is value in regularly updating the bitmap, so add code to periodically pause while all pending sync requests complete, then update the bitmap. Doing this only every few seconds (the same as the bitmap update time) does not notciably affect resync performance. [snitzer@gmail.com: export bitmap_cond_end_sync] Signed-off-by: Neil Brown Cc: "Mike Snitzer" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/raid/bitmap.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h index 306a1d1a5af0..e51b531cd0b2 100644 --- a/include/linux/raid/bitmap.h +++ b/include/linux/raid/bitmap.h @@ -244,6 +244,8 @@ struct bitmap { */ unsigned long daemon_lastrun; /* jiffies of last run */ unsigned long daemon_sleep; /* how many seconds between updates? */ + unsigned long last_end_sync; /* when we lasted called end_sync to + * update bitmap with resync progress */ atomic_t pending_writes; /* pending writes to the bitmap file */ wait_queue_head_t write_wait; @@ -275,6 +277,7 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int degraded); void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted); void bitmap_close_sync(struct bitmap *bitmap); +void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector); void bitmap_unplug(struct bitmap *bitmap); void bitmap_daemon_work(struct bitmap *bitmap); -- cgit v1.2.2