diff options
| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2013-03-19 21:16:44 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-03-23 04:13:59 +0400 |
| commit | 3a4d4eb3cb03fbc66696fc8cd472701d56f3aee7 (patch) | |
| tree | 06a5d9a18bb35f23e68c3cca745f28b3f409e41c /drivers/block/drbd/drbd_actlog.c | |
| parent | ae8bf312e97d554b6aa32e7b2ceb993812ad0835 (diff) | |
| download | linux-3a4d4eb3cb03fbc66696fc8cd472701d56f3aee7.tar.xz | |
drbd: prepare for new striped layout of activity log
Introduce two new on-disk meta data fields: al_stripes and al_stripe_size_4k
The intended use case is activity log on RAID 0 or similar.
Logically consecutive transactions will advance their on-disk position
by al_stripe_size_4k 4kB (transaction sized) blocks.
Right now, these are still asserted to be the backward compatible
values al_stripes = 1, al_stripe_size_4k = 8 (which amounts to 32kB).
Also introduce a caching member for meta_dev_idx in the in-core
structure: even though it is initially passed in in the rcu-protected
disk_conf structure, it cannot change without a detach/attach cycle.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/drbd/drbd_actlog.c')
| -rw-r--r-- | drivers/block/drbd/drbd_actlog.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index b230d91ec430..7e7680e8da6c 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -353,11 +353,11 @@ static unsigned int rs_extent_to_bm_page(unsigned int rs_enr) static sector_t al_tr_number_to_on_disk_sector(struct drbd_conf *mdev) { - const unsigned int stripes = 1; - const unsigned int stripe_size_4kB = MD_32kB_SECT/MD_4kB_SECT; + const unsigned int stripes = mdev->ldev->md.al_stripes; + const unsigned int stripe_size_4kB = mdev->ldev->md.al_stripe_size_4k; /* transaction number, modulo on-disk ring buffer wrap around */ - unsigned int t = mdev->al_tr_number % (stripe_size_4kB * stripes); + unsigned int t = mdev->al_tr_number % (mdev->ldev->md.al_size_4k); /* ... to aligned 4k on disk block */ t = ((t % stripes) * stripe_size_4kB) + t/stripes; |