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Date:   Fri, 22 Mar 2019 12:15:21 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Nikolay Borisov <>,
        Filipe Manana <>,
        David Sterba <>
Subject: [PATCH 4.19 168/280] Btrfs: setup a nofs context for memory allocation at btrfs_create_tree()

4.19-stable review patch.  If anyone has any objections, please let me know.


From: Filipe Manana <>

commit b89f6d1fcb30a8cbdc18ce00c7d93792076af453 upstream.

We are holding a transaction handle when creating a tree, therefore we can
not allocate the root using GFP_KERNEL, as we could deadlock if reclaim is
triggered by the allocation, therefore setup a nofs context.

Fixes: 74e4d82757f74 ("btrfs: let callers of btrfs_alloc_root pass gfp flags")
CC: # 4.9+
Reviewed-by: Nikolay Borisov <>
Signed-off-by: Filipe Manana <>
Reviewed-by: David Sterba <>
Signed-off-by: David Sterba <>
Signed-off-by: Greg Kroah-Hartman <>

 fs/btrfs/disk-io.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -17,6 +17,7 @@
 #include <linux/semaphore.h>
 #include <linux/error-injection.h>
 #include <linux/crc32c.h>
+#include <linux/sched/mm.h>
 #include <asm/unaligned.h>
 #include "ctree.h"
 #include "disk-io.h"
@@ -1236,10 +1237,17 @@ struct btrfs_root *btrfs_create_tree(str
 	struct btrfs_root *tree_root = fs_info->tree_root;
 	struct btrfs_root *root;
 	struct btrfs_key key;
+	unsigned int nofs_flag;
 	int ret = 0;
 	uuid_le uuid = NULL_UUID_LE;
+	/*
+	 * We're holding a transaction handle, so use a NOFS memory allocation
+	 * context to avoid deadlock if reclaim happens.
+	 */
+	nofs_flag = memalloc_nofs_save();
 	root = btrfs_alloc_root(fs_info, GFP_KERNEL);
+	memalloc_nofs_restore(nofs_flag);
 	if (!root)
 		return ERR_PTR(-ENOMEM);

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