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Commit 62421b38 authored by Huaisheng Ye's avatar Huaisheng Ye Committed by Mike Snitzer
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dm writecache: add unlikely for getting two block with same LBA 



In function writecache_writeback, entries g and f has same original
sector only happens at entry f has been committed, but entry g has
NOT yet.

The probability of this happening is very low in the following
256 blocks at most of entry e.

Signed-off-by: default avatarHuaisheng Ye <yehs1@lenovo.com>
Acked-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 58912dbc

drivers/md/dm-writecache.c

+2 −2
Original line number Diff line number Diff line
@@ -1628,8 +1628,8 @@ static void writecache_writeback(struct work_struct *work) 
			if (unlikely(!next_node))

				break;

			g = container_of(next_node, struct wc_entry, rb_node);

			if (read_original_sector(wc, g) ==

			    read_original_sector(wc, f)) {

			if (unlikely(read_original_sector(wc, g) ==

			    read_original_sector(wc, f))) {

				f = g;

				continue;

			}