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-rw-r--r--fs/btrfs/relocation.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index c4af0cdb783d..2cf5e142675e 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1395,14 +1395,23 @@ static struct btrfs_root *create_reloc_root(struct btrfs_trans_handle *trans,
root_key.offset = objectid;
if (root->root_key.objectid == objectid) {
+ u64 commit_root_gen;
+
/* called by btrfs_init_reloc_root */
ret = btrfs_copy_root(trans, root, root->commit_root, &eb,
BTRFS_TREE_RELOC_OBJECTID);
BUG_ON(ret);
-
last_snap = btrfs_root_last_snapshot(&root->root_item);
- btrfs_set_root_last_snapshot(&root->root_item,
- trans->transid - 1);
+ /*
+ * Set the last_snapshot field to the generation of the commit
+ * root - like this ctree.c:btrfs_block_can_be_shared() behaves
+ * correctly (returns true) when the relocation root is created
+ * either inside the critical section of a transaction commit
+ * (through transaction.c:qgroup_account_snapshot()) and when
+ * it's created before the transaction commit is started.
+ */
+ commit_root_gen = btrfs_header_generation(root->commit_root);
+ btrfs_set_root_last_snapshot(&root->root_item, commit_root_gen);
} else {
/*
* called by btrfs_reloc_post_snapshot_hook.