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authorShenghui Wang <shhuiw@foxmail.com>2018-10-08 20:41:07 +0800
committerJens Axboe <axboe@kernel.dk>2018-10-08 08:19:37 -0600
commit7a55948d38eb9b274cbbdd56dc1dd4b96ebfbe04 (patch)
tree4e1198155861a7803999844f31059604214c3b90 /drivers/md/bcache
parent6d8623a71135d8e2d397c1534f35e04dcf867749 (diff)
downloadlinux-7a55948d38eb9b274cbbdd56dc1dd4b96ebfbe04.tar.bz2
bcache: account size of buckets used in uuid write to ca->meta_sectors_written
UUIDs are considered as metadata. __uuid_write should add the number of buckets (in sectors) written to disk to ca->meta_sectors_written. Currently only 1 bucket is used in uuid write. Steps to test: 1) create a fresh backing device and a fresh cache device separately. The backing device didn't attach to any cache set. 2) cd /sys/block/<cache device>/bcache cat metadata_written // record the output value cat bucket_size 3) attach the backing device to cache set 4) cat metadata_written The output value is almost the same as the value in step 2 before the change. After the change, the value is bigger about 1 bucket size. Signed-off-by: Shenghui Wang <shhuiw@foxmail.com> Reviewed-by: Tang Junhui <tang.junhui.linux@gmail.com> Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md/bcache')
-rw-r--r--drivers/md/bcache/super.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 30ba9aeb5ee8..5fd1466b34e4 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -418,6 +418,7 @@ static int __uuid_write(struct cache_set *c)
{
BKEY_PADDED(key) k;
struct closure cl;
+ struct cache *ca;
closure_init_stack(&cl);
lockdep_assert_held(&bch_register_lock);
@@ -429,6 +430,10 @@ static int __uuid_write(struct cache_set *c)
uuid_io(c, REQ_OP_WRITE, 0, &k.key, &cl);
closure_sync(&cl);
+ /* Only one bucket used for uuid write */
+ ca = PTR_CACHE(c, &k.key, 0);
+ atomic_long_add(ca->sb.bucket_size, &ca->meta_sectors_written);
+
bkey_copy(&c->uuid_bucket, &k.key);
bkey_put(c, &k.key);
return 0;