| From 5cc2b17e80cf5770f2e585c2d90fd8af1b901258 Mon Sep 17 00:00:00 2001 |
| From: Filipe Manana <fdmanana@suse.com> |
| Date: Mon, 2 Mar 2015 20:53:52 +0000 |
| Subject: Btrfs: send, add missing check for dead clone root |
| |
| From: Filipe Manana <fdmanana@suse.com> |
| |
| commit 5cc2b17e80cf5770f2e585c2d90fd8af1b901258 upstream. |
| |
| After we locked the root's root item, a concurrent snapshot deletion |
| call might have set the dead flag on it. So check if the dead flag |
| is set and abort if it is, just like we do for the parent root. |
| |
| Signed-off-by: Filipe Manana <fdmanana@suse.com> |
| Reviewed-by: David Sterba <dsterba@suse.cz> |
| Signed-off-by: Chris Mason <clm@fb.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| fs/btrfs/send.c | 3 ++- |
| 1 file changed, 2 insertions(+), 1 deletion(-) |
| |
| --- a/fs/btrfs/send.c |
| +++ b/fs/btrfs/send.c |
| @@ -5855,7 +5855,8 @@ long btrfs_ioctl_send(struct file *mnt_f |
| clone_sources_to_rollback = i + 1; |
| spin_lock(&clone_root->root_item_lock); |
| clone_root->send_in_progress++; |
| - if (!btrfs_root_readonly(clone_root)) { |
| + if (!btrfs_root_readonly(clone_root) || |
| + btrfs_root_dead(clone_root)) { |
| spin_unlock(&clone_root->root_item_lock); |
| srcu_read_unlock(&fs_info->subvol_srcu, index); |
| ret = -EPERM; |
