在 2016/11/30 4:49, Eric Wheeler 写道:

On Fri, 25 Nov 2016, Yijing Wang wrote:

quoted

set_capacity() has been called in bcache_device_init(),
remove the redundant one.

Signed-off-by: Yijing Wang <redacted>
---
 drivers/md/bcache/super.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 849ad44..b638a16 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c

@@ -1126,9 +1126,6 @@ static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
 	if (ret)
 		return ret;
 
-	set_capacity(dc->disk.disk,
-		     dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
-

It probably is a duplicate set_capacity, but has anyone tested bringing on 
a writeback volume, and late-attaching the cache volume with this patch 
applied?

Otherwise stated, is it possible to get the backing device attached 
without setting the capacity?

Hi Eric, I tested this case in following steps, the result is fine, the capability is setted.

[root@38 sys]# make-bcache -B /dev/nvme1n1
UUID:			6758bd42-c226-4de9-a6d5-fb003af63f9f
Set UUID:		2661eadd-79b4-4c56-a2fb-9f8b505aa9fd
version:		1
block_size:		1
data_offset:		16
[root@38 sys]# ls /dev/bcache
bcache/  bcache0
[root@38 sys]# fdisk -l
Disk /dev/nvme1n1: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
....
Disk /dev/bcache0: 1.8 TiB, 2000398925824 bytes, 3907029152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
....
[root@38 sys]# make-bcache -C /dev/ram0
UUID:			b64a4425-b9c1-4650-9cab-3856410c9566
Set UUID:		a0a31965-a89d-43b6-a5d6-968897abeb7a
version:		0
nbuckets:		1024
block_size:		1
bucket_size:		1024
nr_in_set:		1
nr_this_dev:		0
first_bucket:		1
[root@38 sys]# echo a0a31965-a89d-43b6-a5d6-968897abeb7a > /sys/block/bcache0/bcache/attach
[root@38 sys]# echo writeback > /sys/block/bcache0/bcache/cache_mode
[root@38 sys]# mount /dev/bcache0 /tmp
[root@38 sys]# cd /tmp/
[root@38 tmp]# fio ~/fio_write.sh
file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=psync, iodepth=1
fio-2.2.8
Starting 1 thread
file1: Laying out IO file(s) (1 file(s) / 128MB)
Jobs: 1 (f=1): [w(1)] [0.0% done] [0KB/177.2MB/0KB /s] [0/45.4K/0 iops] [eta 05h:33m:13s]

Thanks!
Yijing.

-Eric

quoted

 	dc->disk.disk->queue->backing_dev_info.ra_pages =
 		max(dc->disk.disk->queue->backing_dev_info.ra_pages,
 		    q->backing_dev_info.ra_pages);
-- 
2.5.0

--
To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

.