linux-kernel - [PATCH 3.16 254/346] Btrfs: remove root_log_ctx from ctx list before btrfs_sync

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Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Chris Mason" <clm@...com>
Subject: [PATCH 3.16 254/346] Btrfs: remove root_log_ctx from ctx list
 before btrfs_sync_log returns

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Mason <clm@...com>

commit cbd60aa7cd17d81a434234268c55192862147439 upstream.

We use a btrfs_log_ctx structure to pass information into the
tree log commit, and get error values out.  It gets added to a per
log-transaction list which we walk when things go bad.

Commit d1433debe added an optimization to skip waiting for the log
commit, but didn't take root_log_ctx out of the list.  This
patch makes sure we remove things before exiting.

Signed-off-by: Chris Mason <clm@...com>
Fixes: d1433debe7f4346cf9fc0dafc71c3137d2a97bc4
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/btrfs/tree-log.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2601,6 +2601,7 @@ int btrfs_sync_log(struct btrfs_trans_ha

 	if (log_root_tree->log_transid_committed >= root_log_ctx.log_transid) {
 		blk_finish_plug(&plug);
+		list_del_init(&root_log_ctx.list);
 		mutex_unlock(&log_root_tree->log_mutex);
 		ret = root_log_ctx.log_ret;
 		goto out;