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authorLars Ellenberg <lars.ellenberg@linbit.com>2010-03-04 15:52:30 +0100
committerPhilipp Reisner <philipp.reisner@linbit.com>2010-03-11 16:33:46 +0100
commit39ad2bbb5900d1bc9ae8f06cebb4cb2529d9e42e (patch)
treeffde415c880275bed82a30f172d9c94ef929398f /drivers/block/drbd
parent1f55243024087b56aef0b1e6d9c0ea89c76f0a6b (diff)
drbd: fix al-to-on-disk-bitmap for 4k logical_block_size
Up to now, applying the in-core activity-log to the on-disk bitmap did not care for logical_block_size. On logical_block_size != 512 byte, this very likely results in misalligned block access and spurious "io errors". We now simply always submit aligned whole 4k blocks, fixing this for logical block sizes of 512, 1024, 2048 and 4096. For even larger logical block sizes, this won't work. But I'm not aware of devices with such properties being available. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd')
-rw-r--r--drivers/block/drbd/drbd_actlog.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 17956ff6a08..43e57f395fd 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -536,7 +536,9 @@ static void atodb_endio(struct bio *bio, int error)
put_ldev(mdev);
}
+/* sector to word */
#define S2W(s) ((s)<<(BM_EXT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL))
+
/* activity log to on disk bitmap -- prepare bio unless that sector
* is already covered by previously prepared bios */
static int atodb_prepare_unless_covered(struct drbd_conf *mdev,
@@ -546,13 +548,20 @@ static int atodb_prepare_unless_covered(struct drbd_conf *mdev,
{
struct bio *bio;
struct page *page;
- sector_t on_disk_sector = enr + mdev->ldev->md.md_offset
- + mdev->ldev->md.bm_offset;
+ sector_t on_disk_sector;
unsigned int page_offset = PAGE_SIZE;
int offset;
int i = 0;
int err = -ENOMEM;
+ /* We always write aligned, full 4k blocks,
+ * so we can ignore the logical_block_size (for now) */
+ enr &= ~7U;
+ on_disk_sector = enr + mdev->ldev->md.md_offset
+ + mdev->ldev->md.bm_offset;
+
+ D_ASSERT(!(on_disk_sector & 7U));
+
/* Check if that enr is already covered by an already created bio.
* Caution, bios[] is not NULL terminated,
* but only initialized to all NULL.
@@ -588,7 +597,7 @@ static int atodb_prepare_unless_covered(struct drbd_conf *mdev,
offset = S2W(enr);
drbd_bm_get_lel(mdev, offset,
- min_t(size_t, S2W(1), drbd_bm_words(mdev) - offset),
+ min_t(size_t, S2W(8), drbd_bm_words(mdev) - offset),
kmap(page) + page_offset);
kunmap(page);
@@ -597,7 +606,7 @@ static int atodb_prepare_unless_covered(struct drbd_conf *mdev,
bio->bi_bdev = mdev->ldev->md_bdev;
bio->bi_sector = on_disk_sector;
- if (bio_add_page(bio, page, MD_SECTOR_SIZE, page_offset) != MD_SECTOR_SIZE)
+ if (bio_add_page(bio, page, 4096, page_offset) != 4096)
goto out_put_page;
atomic_inc(&wc->count);