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-rw-r--r--drivers/md/persistent-data/dm-array.c10
-rw-r--r--drivers/md/persistent-data/dm-block-manager.c6
-rw-r--r--drivers/md/persistent-data/dm-block-manager.h7
-rw-r--r--drivers/md/persistent-data/dm-space-map-common.c32
-rw-r--r--drivers/md/persistent-data/dm-space-map-metadata.c8
5 files changed, 48 insertions, 15 deletions
diff --git a/drivers/md/persistent-data/dm-array.c b/drivers/md/persistent-data/dm-array.c
index af96e24ec328..1d75b1dc1e2e 100644
--- a/drivers/md/persistent-data/dm-array.c
+++ b/drivers/md/persistent-data/dm-array.c
@@ -317,8 +317,16 @@ static int shadow_ablock(struct dm_array_info *info, dm_block_t *root,
* The shadow op will often be a noop. Only insert if it really
* copied data.
*/
- if (dm_block_location(*block) != b)
+ if (dm_block_location(*block) != b) {
+ /*
+ * dm_tm_shadow_block will have already decremented the old
+ * block, but it is still referenced by the btree. We
+ * increment to stop the insert decrementing it below zero
+ * when overwriting the old value.
+ */
+ dm_tm_inc(info->btree_info.tm, b);
r = insert_ablock(info, index, *block, root);
+ }
return r;
}
diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c
index a7e8bf296388..064a3c271baa 100644
--- a/drivers/md/persistent-data/dm-block-manager.c
+++ b/drivers/md/persistent-data/dm-block-manager.c
@@ -626,6 +626,12 @@ void dm_bm_set_read_only(struct dm_block_manager *bm)
}
EXPORT_SYMBOL_GPL(dm_bm_set_read_only);
+void dm_bm_set_read_write(struct dm_block_manager *bm)
+{
+ bm->read_only = false;
+}
+EXPORT_SYMBOL_GPL(dm_bm_set_read_write);
+
u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor)
{
return crc32c(~(u32) 0, data, len) ^ init_xor;
diff --git a/drivers/md/persistent-data/dm-block-manager.h b/drivers/md/persistent-data/dm-block-manager.h
index 9a82083a66b6..13cd58e1fe69 100644
--- a/drivers/md/persistent-data/dm-block-manager.h
+++ b/drivers/md/persistent-data/dm-block-manager.h
@@ -108,9 +108,9 @@ int dm_bm_unlock(struct dm_block *b);
int dm_bm_flush_and_unlock(struct dm_block_manager *bm,
struct dm_block *superblock);
- /*
- * Request data be prefetched into the cache.
- */
+/*
+ * Request data is prefetched into the cache.
+ */
void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b);
/*
@@ -125,6 +125,7 @@ void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b);
* be returned if you do.
*/
void dm_bm_set_read_only(struct dm_block_manager *bm);
+void dm_bm_set_read_write(struct dm_block_manager *bm);
u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor);
diff --git a/drivers/md/persistent-data/dm-space-map-common.c b/drivers/md/persistent-data/dm-space-map-common.c
index 6058569fe86c..466a60bbd716 100644
--- a/drivers/md/persistent-data/dm-space-map-common.c
+++ b/drivers/md/persistent-data/dm-space-map-common.c
@@ -381,7 +381,7 @@ int sm_ll_find_free_block(struct ll_disk *ll, dm_block_t begin,
}
static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
- uint32_t (*mutator)(void *context, uint32_t old),
+ int (*mutator)(void *context, uint32_t old, uint32_t *new),
void *context, enum allocation_event *ev)
{
int r;
@@ -410,11 +410,17 @@ static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
if (old > 2) {
r = sm_ll_lookup_big_ref_count(ll, b, &old);
- if (r < 0)
+ if (r < 0) {
+ dm_tm_unlock(ll->tm, nb);
return r;
+ }
}
- ref_count = mutator(context, old);
+ r = mutator(context, old, &ref_count);
+ if (r) {
+ dm_tm_unlock(ll->tm, nb);
+ return r;
+ }
if (ref_count <= 2) {
sm_set_bitmap(bm_le, bit, ref_count);
@@ -465,9 +471,10 @@ static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
return ll->save_ie(ll, index, &ie_disk);
}
-static uint32_t set_ref_count(void *context, uint32_t old)
+static int set_ref_count(void *context, uint32_t old, uint32_t *new)
{
- return *((uint32_t *) context);
+ *new = *((uint32_t *) context);
+ return 0;
}
int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
@@ -476,9 +483,10 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
return sm_ll_mutate(ll, b, set_ref_count, &ref_count, ev);
}
-static uint32_t inc_ref_count(void *context, uint32_t old)
+static int inc_ref_count(void *context, uint32_t old, uint32_t *new)
{
- return old + 1;
+ *new = old + 1;
+ return 0;
}
int sm_ll_inc(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
@@ -486,9 +494,15 @@ int sm_ll_inc(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
return sm_ll_mutate(ll, b, inc_ref_count, NULL, ev);
}
-static uint32_t dec_ref_count(void *context, uint32_t old)
+static int dec_ref_count(void *context, uint32_t old, uint32_t *new)
{
- return old - 1;
+ if (!old) {
+ DMERR_LIMIT("unable to decrement a reference count below 0");
+ return -EINVAL;
+ }
+
+ *new = old - 1;
+ return 0;
}
int sm_ll_dec(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c
index 1c959684caef..58fc1eef7499 100644
--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -384,12 +384,16 @@ static int sm_metadata_new_block(struct dm_space_map *sm, dm_block_t *b)
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
int r = sm_metadata_new_block_(sm, b);
- if (r)
+ if (r) {
DMERR("unable to allocate new metadata block");
+ return r;
+ }
r = sm_metadata_get_nr_free(sm, &count);
- if (r)
+ if (r) {
DMERR("couldn't get free block count");
+ return r;
+ }
check_threshold(&smm->threshold, count);