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Commit ca456ae2 authored by liubo's avatar liubo Committed by Chris Mason
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Btrfs: don't save the inode cache in non-FS roots 



This adds extra checks to make sure the inode map we are caching really
belongs to a FS root instead of a special relocation tree.  It
prevents crashes during balancing operations.

Signed-off-by: default avatarLiu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 211f96c2

fs/btrfs/inode-map.c

+6 −0
Original line number Diff line number Diff line
@@ -388,6 +388,12 @@ int btrfs_save_ino_cache(struct btrfs_root *root, 
	int prealloc;

	bool retry = false;



	/* only fs tree and subvol/snap needs ino cache */

	if (root->root_key.objectid != BTRFS_FS_TREE_OBJECTID &&

	    (root->root_key.objectid < BTRFS_FIRST_FREE_OBJECTID ||

	     root->root_key.objectid > BTRFS_LAST_FREE_OBJECTID))

		return 0;



	path = btrfs_alloc_path();

	if (!path)

		return -ENOMEM;