diff options
| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2013-03-19 17:16:44 (GMT) |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-03-23 00:13:59 (GMT) |
| commit | 3a4d4eb3cb03fbc66696fc8cd472701d56f3aee7 (patch) | |
| tree | 06a5d9a18bb35f23e68c3cca745f28b3f409e41c /drivers/block/drbd/drbd_nl.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_nl.c')
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 581f680..104b7ce 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -727,24 +727,23 @@ static void drbd_md_set_sector_offsets(struct drbd_conf *mdev, rcu_read_lock(); meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx; + bdev->md.md_offset = drbd_md_ss(bdev); + switch (meta_dev_idx) { default: /* v07 style fixed size indexed meta data */ bdev->md.md_size_sect = MD_128MB_SECT; - bdev->md.md_offset = drbd_md_ss__(mdev, bdev); bdev->md.al_offset = MD_4kB_SECT; bdev->md.bm_offset = MD_4kB_SECT + al_size_sect; break; case DRBD_MD_INDEX_FLEX_EXT: /* just occupy the full device; unit: sectors */ bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); - bdev->md.md_offset = 0; bdev->md.al_offset = MD_4kB_SECT; bdev->md.bm_offset = MD_4kB_SECT + al_size_sect; break; case DRBD_MD_INDEX_INTERNAL: case DRBD_MD_INDEX_FLEX_INT: - bdev->md.md_offset = drbd_md_ss__(mdev, bdev); /* al size is still fixed */ bdev->md.al_offset = -al_size_sect; /* we need (slightly less than) ~ this much bitmap sectors: */ |