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| author | Shenghui Wang <shhuiw@foxmail.com> | 2018-10-08 15:41:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-24 10:20:38 +0300 |
| commit | 65910055b56077cd54277a115d5ff67469c21683 (patch) | |
| tree | 02a21fa265ab7311eeddf542edea2697aec95201 /drivers/md | |
| parent | 16c2d36b11239b0f8f03818764d7c94aa4abd542 (diff) | |
| download | linux-65910055b56077cd54277a115d5ff67469c21683.tar.xz | |
bcache: account size of buckets used in uuid write to ca->meta_sectors_written
[ Upstream commit 7a55948d38eb9b274cbbdd56dc1dd4b96ebfbe04 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/super.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 2321643974da..c4da2fe623e9 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; |