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From: Josef Bacik <josef@toxicpanda.com>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 5/8] btrfs: hold a ref on the root on the dead roots list
Date: Fri, 14 Feb 2020 16:11:44 -0500
Message-ID: <20200214211147.24610-6-josef@toxicpanda.com> (raw)
In-Reply-To: <20200214211147.24610-1-josef@toxicpanda.com>

At the point we add a root to the dead roots list we have no open inodes
for that root, so we need to hold a ref on that root to keep it from
disappearing.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/disk-io.c     | 3 +--
 fs/btrfs/transaction.c | 6 ++++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 26eb1564028d..ffbc4c6c17fe 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2079,8 +2079,7 @@ void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
 
 		if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
 			btrfs_drop_and_free_fs_root(fs_info, gang[0]);
-		else
-			btrfs_put_root(gang[0]);
+		btrfs_put_root(gang[0]);
 	}
 
 	while (1) {
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 3ffeb9a2c6e6..53af0f55f5f9 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1260,8 +1260,10 @@ void btrfs_add_dead_root(struct btrfs_root *root)
 	struct btrfs_fs_info *fs_info = root->fs_info;
 
 	spin_lock(&fs_info->trans_lock);
-	if (list_empty(&root->root_list))
+	if (list_empty(&root->root_list)) {
+		btrfs_grab_root(root);
 		list_add_tail(&root->root_list, &fs_info->dead_roots);
+	}
 	spin_unlock(&fs_info->trans_lock);
 }
 
@@ -2443,7 +2445,7 @@ int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
 		ret = btrfs_drop_snapshot(root, NULL, 0, 0);
 	else
 		ret = btrfs_drop_snapshot(root, NULL, 1, 0);
-
+	btrfs_put_root(root);
 	return (ret < 0) ? 0 : 1;
 }
 
-- 
2.24.1


  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 21:11 [PATCH 0/8][v4] Cleanup how we handle root refs, part 2 Josef Bacik
2020-02-14 21:11 ` [PATCH 1/8] btrfs: make the extent buffer leak check per fs info Josef Bacik
2020-02-19 13:59   ` Nikolay Borisov
2020-02-20 15:49     ` Josef Bacik
2020-02-14 21:11 ` [PATCH 2/8] btrfs: move ino_cache_inode dropping Josef Bacik
2020-02-14 21:11 ` [PATCH 3/8] btrfs: move the root freeing stuff into btrfs_put_root Josef Bacik
2020-02-19 15:10   ` Nikolay Borisov
2020-02-20 15:48     ` Josef Bacik
2020-02-14 21:11 ` [PATCH 4/8] btrfs: make inodes hold a ref on their roots Josef Bacik
2020-02-14 21:11 ` Josef Bacik [this message]
2020-02-14 21:11 ` [PATCH 6/8] btrfs: don't take an extra root ref at allocation time Josef Bacik
2020-02-14 21:11 ` [PATCH 7/8] btrfs: make btrfs_cleanup_fs_roots use the fs_roots_radix_lock Josef Bacik
2020-02-14 21:11 ` [PATCH 8/8] btrfs: kill the subvol_srcu Josef Bacik
  -- strict thread matches above, loose matches on Subject: below --
2020-01-17 13:52 [PATCH 0/8][v2] Cleanup how we handle root refs, part 2 Josef Bacik
2020-01-17 13:52 ` [PATCH 5/8] btrfs: hold a ref on the root on the dead roots list Josef Bacik

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