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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: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
hifive-unleashed-5.1
liubo 2011-06-01 09:42:49 +00:00 committed by Chris Mason
parent 211f96c24f
commit ca456ae280
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/inode-map.c
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@ -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;