btrfs: return error value if create_io_em failed in cow_file_range

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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: 6f9994dbab ("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>

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Su Yue 2018-05-30 16:48:56 +08:00 • committed by David Sterba

parent 6b0cb1f901

commit 090a127afa

1 changed files with 3 additions and 1 deletions

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fs/btrfs/inode.c

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