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dm btree: prefetch child nodes when walking tree for a dm_btree_del

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dm-btree now takes advantage of dm-bufio's ability to prefetch data via
dm_bm_prefetch().  Prior to this change many btree node visits were
causing a synchronous read.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber
2013-08-09 12:59:30 +01:00
committed by Mike Snitzer
parent cd5acf0b44
commit 04f17c802f
3 changed files with 31 additions and 5 deletions
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5
drivers/md/persistent-data/dm-block-manager.c
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@@ -615,6 +615,11 @@ int dm_bm_flush_and_unlock(struct dm_block_manager *bm,
}
EXPORT_SYMBOL_GPL(dm_bm_flush_and_unlock);
void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b)
{
dm_bufio_prefetch(bm->bufio, b, 1);
}
void dm_bm_set_read_only(struct dm_block_manager *bm)
{
bm->read_only = true;