Commit 090a127a authored May 30, 2018 by Su Yue Committed by David Sterba May 30, 2018

btrfs: return error value if create_io_em failed in cow_file_range



In cow_file_range(), create_io_em() may fail, but its return value is
not recorded.  Then return value may be 0 even it failed which is a
wrong behavior.

Let cow_file_range() return PTR_ERR(em) if create_io_em() failed.

Fixes: 6f9994db ("Btrfs: create a helper to create em for IO")
CC: stable@vger.kernel.org # 4.11+
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 6b0cb1f9

fs/btrfs/inode.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -1018,8 +1018,10 @@ static noinline int cow_file_range(struct inode *inode,
		ram_size, /* ram_bytes */
		BTRFS_COMPRESS_NONE, /* compress_type */
		BTRFS_ORDERED_REGULAR /* type */);
		if (IS_ERR(em))
		if (IS_ERR(em)) {
		ret = PTR_ERR(em);
		goto out_reserve;
		}
		free_extent_map(em);

		ret = btrfs_add_ordered_extent(inode, start, ins.objectid,