[PATCH 6/9] btrfs: use the new bit BTRFS_FS_TREE_MOD_LOG_USERS at btrfs_free_tree_block()

From: fdmanana@kernel.org
To: linux-btrfs@vger.kernel.org
Cc: ce3g8jdj@umail.furryterror.org, Filipe Manana <fdmanana@suse.com>
Subject: [PATCH 6/9] btrfs: use the new bit BTRFS_FS_TREE_MOD_LOG_USERS at btrfs_free_tree_block()
Date: Thu, 11 Mar 2021 14:31:10 +0000	[thread overview]
Message-ID: <8b318da95fb03892feeaeebc94b6efa11515bb56.1615472583.git.fdmanana@suse.com> (raw)
In-Reply-To: <cover.1615472583.git.fdmanana@suse.com>

From: Filipe Manana <fdmanana@suse.com>

Instead of exposing implementation details of the tree mod log to check
if there are active tree mod log users at btrfs_free_tree_block(), use
the new bit BTRFS_FS_TREE_MOD_LOG_USERS for fs_info->flags instead. This
way extent-tree.c does not need to known about any of the internals of
the tree mod log and avoids taking a lock unnecessarily as well.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/extent-tree.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2482b26b1971..7a28314189b4 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3342,11 +3342,9 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 		 * find a node pointing to this leaf and record operations that
 		 * point to this leaf.
 		 */
-		if (btrfs_header_level(buf) == 0) {
-			read_lock(&fs_info->tree_mod_log_lock);
-			must_pin = !list_empty(&fs_info->tree_mod_seq_list);
-			read_unlock(&fs_info->tree_mod_log_lock);
-		}
+		if (btrfs_header_level(buf) == 0 &&
+		    test_bit(BTRFS_FS_TREE_MOD_LOG_USERS, &fs_info->flags))
+			must_pin = true;
 
 		if (must_pin || btrfs_is_zoned(fs_info)) {
 			btrfs_redirty_list_add(trans->transaction, buf);
-- 
2.28.0

