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Merge branch 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

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Pull btrfs fix from Chris Mason:
 "Filipe nailed down a problem where tree log replay would do some work
  that orphan code wasn't expecting to be done yet, leading to BUG_ON"

* 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix loading of orphan roots leading to BUG_ON
This commit is contained in:
Linus Torvalds 2016-03-04 17:31:32 -08:00
commit 2cdcb2b5b5
1 changed files with 9 additions and 1 deletions
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10
fs/btrfs/root-tree.c
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@ -310,8 +310,16 @@ int btrfs_find_orphan_roots(struct btrfs_root *tree_root)
set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
err = btrfs_insert_fs_root(root->fs_info, root);
/*
* The root might have been inserted already, as before we look
* for orphan roots, log replay might have happened, which
* triggers a transaction commit and qgroup accounting, which
* in turn reads and inserts fs roots while doing backref
* walking.
*/
if (err == -EEXIST)
err = 0;
if (err) {
BUG_ON(err == -EEXIST);
btrfs_free_fs_root(root);
break;
}