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btrfs: hold a ref on the root on the dead roots list 

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>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-02-14 16:11:44 -05:00 committed by David Sterba
parent 5c8fd99fec
commit dc9492c14c
2 changed files with 5 additions and 3 deletions
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3
fs/btrfs/disk-io.c
View File

@ -2035,8 +2035,7 @@ 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) {

5
fs/btrfs/transaction.c
View File

@ -1264,8 +1264,10 @@ 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);
}
@ -2435,6 +2437,7 @@ int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
else
ret = btrfs_drop_snapshot(root, 1, 0);
btrfs_put_root(root);
return (ret < 0) ? 0 : 1;
}