dm cache metadata: fail operations if fail_io mode has been established

[linux.git] / drivers / md / dm-cache-metadata.c

diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
index 6735c8d6a44551a6dd9cc25fa9b505316bfde060..4a4e9c75fc4cddca59c30df2f18ebaa6f0baaa61 100644 (file)
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -27,8 +27,6 @@
 #define MIN_CACHE_VERSION 1
 #define MAX_CACHE_VERSION 2
 
-#define CACHE_METADATA_CACHE_SIZE 64
-
 /*
  *  3 for btree insert +
  *  2 for btree lookup used within space map
@@ -535,7 +533,6 @@ static int __create_persistent_data_objects(struct dm_cache_metadata *cmd,
 {
        int r;
        cmd->bm = dm_block_manager_create(cmd->bdev, DM_CACHE_METADATA_BLOCK_SIZE << SECTOR_SHIFT,
-                                         CACHE_METADATA_CACHE_SIZE,
                                          CACHE_MAX_CONCURRENT_LOCKS);
        if (IS_ERR(cmd->bm)) {
                DMERR("could not create block manager");
@@ -1627,17 +1624,19 @@ void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd,
 
 int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown)
 {
-       int r;
+       int r = -EINVAL;
        flags_mutator mutator = (clean_shutdown ? set_clean_shutdown :
                                 clear_clean_shutdown);
 
        WRITE_LOCK(cmd);
+       if (cmd->fail_io)
+               goto out;
+
        r = __commit_transaction(cmd, mutator);
        if (r)
                goto out;
 
        r = __begin_transaction(cmd);
-
 out:
        WRITE_UNLOCK(cmd);
        return r;
@@ -1649,7 +1648,8 @@ int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,
        int r = -EINVAL;
 
        READ_LOCK(cmd);
-       r = dm_sm_get_nr_free(cmd->metadata_sm, result);
+       if (!cmd->fail_io)
+               r = dm_sm_get_nr_free(cmd->metadata_sm, result);
        READ_UNLOCK(cmd);
 
        return r;
@@ -1661,7 +1661,8 @@ int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,
        int r = -EINVAL;
 
        READ_LOCK(cmd);
-       r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
+       if (!cmd->fail_io)
+               r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
        READ_UNLOCK(cmd);
 
        return r;