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Btrfs: send, add missing check for dead clone root 

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>
This commit is contained in:
Filipe Manana 2015-03-02 20:53:52 +00:00 committed by Chris Mason
parent 4f764e5153
commit 5cc2b17e80
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/send.c
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@ -5855,7 +5855,8 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
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;