[PATCH v13 16/42] btrfs: advance allocation pointer after tree log node

[Naohiro Aota <naohiro.aota@wdc.com>]

Since the allocation info of tree log node is not recorded to the extent
tree, calculate_alloc_pointer() cannot detect the node, so the pointer can
be over a tree node.

Replaying the log call btrfs_remove_free_space() for each node in the log
tree. So, advance the pointer after the node.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/free-space-cache.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 990b0887ea45..1af6eec79f66 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2616,8 +2616,22 @@ int btrfs_remove_free_space(struct btrfs_block_group *block_group,
 	int ret;
 	bool re_search = false;
 
-	if (btrfs_is_zoned(block_group->fs_info))
+	if (btrfs_is_zoned(block_group->fs_info)) {
+		/*
+		 * This can happen with conventional zones when replaying
+		 * log. Since the allocation info of tree-log nodes are
+		 * not recorded to the extent-tree, calculate_alloc_pointer()
+		 * failed to advance the allocation pointer after last
+		 * allocated tree log node blocks.
+		 *
+		 * This function is called from
+		 * btrfs_pin_extent_for_log_replay() when replaying the
+		 * log. Advance the pointer not to overwrite the tree-log nodes.
+		 */
+		if (block_group->alloc_offset < offset + bytes)
+			block_group->alloc_offset = offset + bytes;
 		return 0;
+	}
 
 	spin_lock(&ctl->tree_lock);
 
-- 
2.27.0