reflink: change to relative margins

NFS uses 32K blocks and thus the numbers used for sanity checking
various reflink operations are way off.  Change to relative margings
and increase them a bit to make NFS happy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/generic/150

@@ -57,7 +57,7 @@ mkdir "$testdir"
 echo "Create the original file blocks"
 blksz="$(stat -f $testdir -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 sz=$((blksz * blks))
 nr=7
 _pwrite_byte 0x61 0 $sz "$testdir/file1" >> "$seqres.full"

tests/generic/151

@@ -61,7 +61,7 @@ mkdir "$testdir"
 echo "Create the original file blocks"
 blksz="$(stat -f "$testdir" -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f "$testdir" -c '%f')
 nr=7

tests/generic/152

@@ -62,7 +62,7 @@ mkdir "$testdir"
 echo "Create the original file blocks"
 blksz="$(stat -f "$testdir" -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f "$testdir" -c '%f')
 nr=4

tests/generic/153

@@ -62,7 +62,7 @@ mkdir "$testdir"
 echo "Create the original file blocks"
 blksz="$(stat -f "$testdir" -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f "$testdir" -c '%f')
 nr=4

tests/generic/154

@@ -61,7 +61,7 @@ mkdir "$testdir"
 echo "Create the original file blocks"
 blksz="$(stat -f "$testdir" -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 free_blocks0=$(stat -f "$testdir" -c '%f')
 nr=4
 sz=$((blks * blksz))

tests/generic/155

@@ -65,7 +65,7 @@ mkdir $testdir
 echo "Create the original file blocks"
 blksz="$(stat -f "$testdir" -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f "$testdir" -c '%f')
 nr=4

tests/generic/156

@@ -73,7 +73,7 @@ mkdir "$testdir"
 echo "Create the original file blocks"
 blksz="$(stat -f "$testdir" -c '%S')"
 blks=2000
-margin=100
+margin='15%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f "$testdir" -c '%f')
 nr=4

tests/generic/157

@@ -63,7 +63,7 @@ mkdir "$testdir2"
 echo "Create the original files"
 blksz="$(stat -f $testdir1 -c '%S')"
 blks=1000
-margin=50
+margin='7%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f $testdir1 -c '%f')
 nr=4

tests/generic/158

@@ -63,7 +63,7 @@ mkdir "$testdir2"
 echo "Create the original files"
 blksz="$(stat -f $testdir1 -c '%S')"
 blks=1000
-margin=50
+margin='7%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f $testdir1 -c '%f')
 nr=4

tests/generic/159

@@ -56,7 +56,7 @@ mkdir "$testdir1"
 echo "Create the original files"
 blksz="$(stat -f $testdir1 -c '%S')"
 blks=1000
-margin=50
+margin='7%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f $testdir1 -c '%f')
 nr=4

tests/generic/160

@@ -56,7 +56,7 @@ mkdir "$testdir1"
 echo "Create the original files"
 blksz="$(stat -f $testdir1 -c '%S')"
 blks=1000
-margin=50
+margin='7%'
 sz=$((blksz * blks))
 free_blocks0=$(stat -f $testdir1 -c '%f')
 nr=4