FAILED: patch "[PATCH] btrfs: don't run delayed_iputs in commit" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: Josef Bacik <[email protected]>
Date: Thu, 11 Oct 2018 15:54:31 -0400
Subject: [PATCH] btrfs: don't run delayed_iputs in commit

This could result in a really bad case where we do something like

evict
evict_refill_and_join
btrfs_commit_transaction
btrfs_run_delayed_iputs
evict
evict_refill_and_join
btrfs_commit_transaction
... forever

We have plenty of other places where we run delayed iputs that are much safer, let those do the work.

index 5686290a50e1..d1eeef9ec5da 100644
@@ -2283,15 +2283,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans)
 
 	kmem_cache_free(btrfs_trans_handle_cachep, trans);
 
-	/*
-	 * If fs has been frozen, we can not handle delayed iputs, otherwise
-	 * it'll result in deadlock about SB_FREEZE_FS.
-	 */
-	if (current != fs_info->transaction_kthread &&
-	    current != fs_info->cleaner_kthread &&
-	    !test_bit(BTRFS_FS_FROZEN, &fs_info->flags))
-		btrfs_run_delayed_iputs(fs_info);
-
 	return ret;
 
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