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Btrfs: setup a nofs context for memory allocation at btrfs_create_tree()
commitb89f6d1fcb
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:74e4d82757
("btrfs: let callers of btrfs_alloc_root pass gfp flags") CC: stable@vger.kernel.org # 4.9+ Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -17,6 +17,7 @@
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#include <linux/semaphore.h>
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#include <linux/error-injection.h>
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#include <linux/crc32c.h>
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#include <linux/sched/mm.h>
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#include <asm/unaligned.h>
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#include "ctree.h"
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#include "disk-io.h"
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@ -1236,10 +1237,17 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
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struct btrfs_root *tree_root = fs_info->tree_root;
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struct btrfs_root *root;
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struct btrfs_key key;
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unsigned int nofs_flag;
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int ret = 0;
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uuid_le uuid = NULL_UUID_LE;
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/*
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* We're holding a transaction handle, so use a NOFS memory allocation
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* context to avoid deadlock if reclaim happens.
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*/
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nofs_flag = memalloc_nofs_save();
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root = btrfs_alloc_root(fs_info, GFP_KERNEL);
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memalloc_nofs_restore(nofs_flag);
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if (!root)
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return ERR_PTR(-ENOMEM);
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