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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2012-07-30 11:00:54 +0400 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2012-11-09 17:05:44 +0400 |
| commit | 81a3537a9730116dfaafeed728f2d460c872c0d5 (patch) | |
| tree | 44d6e0672f13830aa4a468818a0c2ce425a1cfac /drivers/block/drbd/drbd_actlog.c | |
| parent | 58ffa580a748dd16b1e5ab260bea39cdbd1e94ef (diff) | |
| download | linux-81a3537a9730116dfaafeed728f2d460c872c0d5.tar.xz | |
drbd: announce FLUSH/FUA capability to upper layers
In 8.4, we may have bios spanning two activity log extents.
Fixup drbd_al_begin_io() and drbd_al_complete_io() to deal with zero sized bios.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_actlog.c')
| -rw-r--r-- | drivers/block/drbd/drbd_actlog.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index 209b2e063b92..e81085795ec4 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -248,11 +248,12 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i) /* for bios crossing activity log extent boundaries, * we may need to activate two extents in one go */ unsigned first = i->sector >> (AL_EXTENT_SHIFT-9); - unsigned last = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); + unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); unsigned enr; bool locked = false; + D_ASSERT(first <= last); D_ASSERT(atomic_read(&mdev->local_cnt) > 0); for (enr = first; enr <= last; enr++) @@ -305,11 +306,12 @@ void drbd_al_complete_io(struct drbd_conf *mdev, struct drbd_interval *i) /* for bios crossing activity log extent boundaries, * we may need to activate two extents in one go */ unsigned first = i->sector >> (AL_EXTENT_SHIFT-9); - unsigned last = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); + unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); unsigned enr; struct lc_element *extent; unsigned long flags; + D_ASSERT(first <= last); spin_lock_irqsave(&mdev->al_lock, flags); for (enr = first; enr <= last; enr++) { @@ -756,7 +758,11 @@ int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size, unsigned int enr, count = 0; struct lc_element *e; - if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { + /* this should be an empty REQ_FLUSH */ + if (size == 0) + return 0; + + if (size < 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { dev_err(DEV, "sector: %llus, size: %d\n", (unsigned long long)sector, size); return 0; |