Alex Elder <elder@xxxxxxxxxxx> wrote: >(This and the next two patches I'm about to post are available in >the "review/wip-rbd" branch of the ceph-client git repository.) > >This includes a few relatively small fixes I found while examining >the code that refreshes image information. > >This resolves: > http://tracker.ceph.com/issues/5040 > >Signed-off-by: Alex Elder <elder@xxxxxxxxxxx> >--- > drivers/block/rbd.c | 53 >+++++++++++++++++++++++++++++++++++++++++---------- > 1 file changed, 43 insertions(+), 10 deletions(-) > >diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c >index f860dd6..aec2438 100644 >--- a/drivers/block/rbd.c >+++ b/drivers/block/rbd.c >@@ -2876,7 +2876,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, >u8 opcode, void *data) > (unsigned int)opcode); > ret = rbd_dev_refresh(rbd_dev); > if (ret) >- rbd_warn(rbd_dev, ": header refresh error (%d)\n", ret); >+ rbd_warn(rbd_dev, "header refresh error (%d)\n", ret); > > rbd_obj_notify_ack(rbd_dev, notify_id); > } >@@ -3356,8 +3356,8 @@ static int rbd_dev_refresh(struct rbd_device >*rbd_dev) > int ret; > > rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); >- mapping_size = rbd_dev->mapping.size; > mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); >+ mapping_size = rbd_dev->mapping.size; > if (rbd_dev->image_format == 1) > ret = rbd_dev_v1_header_info(rbd_dev); > else >@@ -3830,6 +3830,7 @@ static int rbd_dev_v2_parent_info(struct >rbd_device *rbd_dev) > void *end; > u64 pool_id; > char *image_id; >+ u64 snap_id; > u64 overlap; > int ret; > >@@ -3889,24 +3890,56 @@ static int rbd_dev_v2_parent_info(struct >rbd_device *rbd_dev) > (unsigned long long)pool_id, U32_MAX); > goto out_err; > } >- parent_spec->pool_id = pool_id; > > image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); > if (IS_ERR(image_id)) { > ret = PTR_ERR(image_id); > goto out_err; > } >- parent_spec->image_id = image_id; >- ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); >+ ceph_decode_64_safe(&p, end, snap_id, out_err); > ceph_decode_64_safe(&p, end, overlap, out_err); > >- if (overlap) { >- rbd_spec_put(rbd_dev->parent_spec); >+ /* >+ * The parent won't change (except when the clone is >+ * flattened, already handled that). So we only need to >+ * record the parent spec we have not already done so. >+ */ >+ if (!rbd_dev->parent_spec) { >+ parent_spec->pool_id = pool_id; >+ parent_spec->image_id = image_id; >+ parent_spec->snap_id = snap_id; > rbd_dev->parent_spec = parent_spec; > parent_spec = NULL; /* rbd_dev now owns this */ >- rbd_dev->parent_overlap = overlap; >- } else { >- rbd_warn(rbd_dev, "ignoring parent of clone with overlap 0\n"); >+ } >+ >+ /* >+ * We always update the parent overlap. If it's zero we >+ * treat it specially. >+ */ >+ rbd_dev->parent_overlap = overlap; >+ smp_mb(); >+ if (!overlap) { >+ >+ /* A null parent_spec indicates it's the initial probe */ >+ >+ if (parent_spec) { >+ /* >+ * The overlap has become zero, so the clone >+ * must have been resized down to 0 at some >+ * point. Treat this the same as a flatten. >+ */ >+ rbd_dev_parent_put(rbd_dev); >+ pr_info("%s: clone image now standalone\n", >+ rbd_dev->disk->disk_name); >+ } else { >+ /* >+ * For the initial probe, if we find the >+ * overlap is zero we just pretend there was >+ * no parent image. >+ */ >+ rbd_warn(rbd_dev, "ignoring parent of " >+ "clone with overlap 0\n"); >+ } > } > out: > ret = 0; Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx> -- 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
