generic/471: adapt test when running on btrfs to avoid failure on RWF_NOWAIT write

[xfstests-dev.git] / tests / generic / 471

diff --git a/tests/generic/471 b/tests/generic/471
index 7513f02328790e0eeeb442f6f63b4147a0b4aa3e..e9856b5201bded4b6f6f69c28a5c3ac1906fa979 100755 (executable)
--- a/tests/generic/471
+++ b/tests/generic/471
@@ -37,6 +37,17 @@ fi
 
 mkdir $testdir
 
+# Btrfs is a COW filesystem, so a RWF_NOWAIT write will always fail with -EAGAIN
+# when writing to a file range except if it's a NOCOW file and an extent for the
+# range already exists or if it's a COW file and preallocated/unwritten extent
+# exists in the target range. So to make sure that the last write succeeds on
+# all filesystems, use a NOCOW file on btrfs.
+if [ $FSTYP == "btrfs" ]; then
+       _require_chattr C
+       touch $testdir/f1
+       $CHATTR_PROG +C $testdir/f1
+fi
+
 # Create a file with pwrite nowait (will fail with EAGAIN)
 $XFS_IO_PROG -f -d -c "pwrite -N -V 1 -b 1M 0 1M" $testdir/f1