提交 a9995eec 编写于 作者: J Josef Bacik 提交者: Chris Mason

Btrfs: init relocate extent_io_tree with a mapping

Dave reported a NULL pointer deref.  This is caused because he thought he'd be
smart and add sanity checks to the extent_io bit operations, but he didn't
expect a tree to have a NULL mapping.  To fix this we just need to init the
relocation's processed_blocks with the btree_inode->i_mapping.  Thanks,
Reported-by: NDavid Sterba <dsterba@suse.cz>
Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
Signed-off-by: NChris Mason <chris.mason@fusionio.com>
上级 6379ef9f
......@@ -4082,7 +4082,7 @@ struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
return inode;
}
static struct reloc_control *alloc_reloc_control(void)
static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
{
struct reloc_control *rc;
......@@ -4093,7 +4093,8 @@ static struct reloc_control *alloc_reloc_control(void)
INIT_LIST_HEAD(&rc->reloc_roots);
backref_cache_init(&rc->backref_cache);
mapping_tree_init(&rc->reloc_root_tree);
extent_io_tree_init(&rc->processed_blocks, NULL);
extent_io_tree_init(&rc->processed_blocks,
fs_info->btree_inode->i_mapping);
return rc;
}
......@@ -4110,7 +4111,7 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start)
int rw = 0;
int err = 0;
rc = alloc_reloc_control();
rc = alloc_reloc_control(fs_info);
if (!rc)
return -ENOMEM;
......@@ -4311,7 +4312,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
if (list_empty(&reloc_roots))
goto out;
rc = alloc_reloc_control();
rc = alloc_reloc_control(root->fs_info);
if (!rc) {
err = -ENOMEM;
goto out;
......
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