Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx> Alex Elder <elder@xxxxxxxxxxx> wrote: >Make sure two concurrent unmap operations on the same rbd device >won't collide, by only proceeding with the removal and cleanup of a >device if is not already underway. > >Signed-off-by: Alex Elder <elder@xxxxxxxxxxx> >--- > drivers/block/rbd.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > >diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c >index 716ef1f..380940d 100644 >--- a/drivers/block/rbd.c >+++ b/drivers/block/rbd.c >@@ -5153,6 +5153,7 @@ static ssize_t rbd_remove(struct bus_type *bus, > struct list_head *tmp; > int dev_id; > unsigned long ul; >+ bool already = false; > int ret; > > ret = strict_strtoul(buf, 10, &ul); >@@ -5180,11 +5181,12 @@ static ssize_t rbd_remove(struct bus_type *bus, > if (rbd_dev->open_count) > ret = -EBUSY; > else >- set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); >+ already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, >+ &rbd_dev->flags); > spin_unlock_irq(&rbd_dev->lock); > } > spin_unlock(&rbd_dev_list_lock); >- if (ret < 0) >+ if (ret < 0 || already) > goto done; > > rbd_bus_del_dev(rbd_dev); -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
