Btrfs: add a extent ref verify tool
We were having corruption issues that were tied back to problems with
the extent tree. In order to track them down I built this tool to try
and find the culprit, which was pretty successful. If you compile with
this tool on it will live verify every ref update that the fs makes and
make sure it is consistent and valid. I've run this through with
xfstests and haven't gotten any false positives. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update error messages, add fixup from Dan Carpenter to handle errors
of read_tree_block ]
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index f3e6e8f..f971d56 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -51,6 +51,7 @@
#include "qgroup.h"
#include "compression.h"
#include "tree-checker.h"
+#include "ref-verify.h"
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
@@ -2509,6 +2510,7 @@ int open_ctree(struct super_block *sb,
/* readahead state */
INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
spin_lock_init(&fs_info->reada_lock);
+ btrfs_init_ref_verify(fs_info);
fs_info->thread_pool_size = min_t(unsigned long,
num_online_cpus() + 2, 8);
@@ -2920,6 +2922,9 @@ int open_ctree(struct super_block *sb,
if (ret)
goto fail_trans_kthread;
+ if (btrfs_build_ref_tree(fs_info))
+ btrfs_err(fs_info, "couldn't build ref tree");
+
/* do not make disk changes in broken FS or nologreplay is given */
if (btrfs_super_log_root(disk_super) != 0 &&
!btrfs_test_opt(fs_info, NOLOGREPLAY)) {
@@ -3785,6 +3790,7 @@ void close_ctree(struct btrfs_fs_info *fs_info)
cleanup_srcu_struct(&fs_info->subvol_srcu);
btrfs_free_stripe_hash_table(fs_info);
+ btrfs_free_ref_cache(fs_info);
__btrfs_free_block_rsv(root->orphan_block_rsv);
root->orphan_block_rsv = NULL;
