Su Yue 4cb8942042 btrfs: return error value if create_io_em failed in cow_file_range
commit 090a127afa8f73e9618d4058d6755f7ec7453dd6 upstream.

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: 6f9994dbabe5 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-26 08:06:30 +08:00
..
2018-06-21 04:02:59 +09:00
2018-05-30 07:52:35 +02:00
2018-04-19 08:56:21 +02:00
2018-06-05 11:41:54 +02:00
2017-09-04 19:05:15 -04:00
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