dm space map metadata: fix ref counting bug when bootstrapping a new space map

When applying block operations (BOPs) do not remove them from the
uncommitted BOP ring-buffer until after they've been applied -- in case
we recurse.

Also, perform BOP_INC operation, in dm_sm_metadata_create() and
sm_metadata_extend(), in terms of the uncommitted BOP ring-buffer rather
than using direct calls to sm_ll_inc().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c
index 5309129..fca6dbc 100644 (file)
--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -136,7 +136,7 @@ static int brb_push(struct bop_ring_buffer *brb,
        return 0;
 }
 
-static int brb_pop(struct bop_ring_buffer *brb, struct block_op *result)
+static int brb_peek(struct bop_ring_buffer *brb, struct block_op *result)
 {
        struct block_op *bop;
 
@@ -147,6 +147,17 @@ static int brb_pop(struct bop_ring_buffer *brb, struct block_op *result)
        result->type = bop->type;
        result->block = bop->block;
 
+       return 0;
+}
+
+static int brb_pop(struct bop_ring_buffer *brb)
+{
+       struct block_op *bop;
+
+       if (brb_empty(brb))
+               return -ENODATA;
+
+       bop = brb->bops + brb->begin;
        brb->begin = brb_next(brb, brb->begin);
 
        return 0;
@@ -211,7 +222,7 @@ static int apply_bops(struct sm_metadata *smm)
        while (!brb_empty(&smm->uncommitted)) {
                struct block_op bop;
 
-               r = brb_pop(&smm->uncommitted, &bop);
+               r = brb_peek(&smm->uncommitted, &bop);
                if (r) {
                        DMERR("bug in bop ring buffer");
                        break;
@@ -220,6 +231,8 @@ static int apply_bops(struct sm_metadata *smm)
                r = commit_bop(smm, &bop);
                if (r)
                        break;
+
+               brb_pop(&smm->uncommitted);
        }
 
        return r;
@@ -683,7 +696,6 @@ static struct dm_space_map bootstrap_ops = {
 static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
 {
        int r, i;
-       enum allocation_event ev;
        struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
        dm_block_t old_len = smm->ll.nr_blocks;
 
@@ -705,11 +717,12 @@ static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
         * allocate any new blocks.
         */
        do {
-               for (i = old_len; !r && i < smm->begin; i++) {
-                       r = sm_ll_inc(&smm->ll, i, &ev);
-                       if (r)
-                               goto out;
-               }
+               for (i = old_len; !r && i < smm->begin; i++)
+                       r = add_bop(smm, BOP_INC, i);
+
+               if (r)
+                       goto out;
+
                old_len = smm->begin;
 
                r = apply_bops(smm);
@@ -754,7 +767,6 @@ int dm_sm_metadata_create(struct dm_space_map *sm,
 {
        int r;
        dm_block_t i;
-       enum allocation_event ev;
        struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
 
        smm->begin = superblock + 1;
@@ -782,7 +794,7 @@ int dm_sm_metadata_create(struct dm_space_map *sm,
         * allocated blocks that they were built from.
         */
        for (i = superblock; !r && i < smm->begin; i++)
-               r = sm_ll_inc(&smm->ll, i, &ev);
+               r = add_bop(smm, BOP_INC, i);
 
        if (r)
                return r;