cluster/ec: Implement DISCARD FOP for EC

Updates #254

This code change implements DISCARD FOP support for
EC.

BUG: 1461018
Change-Id: I09a9cb2aa9d91ec27add4f422dc9074af5b8b2db
Signed-off-by: Sunil Kumar Acharya <sheggodu@redhat.com>

2 files changed, 204 insertions, 0 deletions

diff --git a/tests/basic/ec/ec-discard.t b/tests/basic/ec/ec-discard.t
new file mode 100644
index 00000000000..4a44cecf0a9
--- /dev/null
+++ b/tests/basic/ec/ec-discard.t
@@ -0,0 +1,197 @@
+#!/bin/bash
+#
+# Test discard functionality
+#
+# Test that basic discard (hole punch) functionality works via the fallocate
+# command line tool. Hole punch deallocates a region of a file, creating a hole
+# and a zero-filled data region. We verify that hole punch works, frees blocks
+# and that subsequent reads do not read stale data (caches are invalidated).
+#
+# NOTE: fuse fallocate is known to be broken with regard to cache invalidation
+# 	up to 3.9.0 kernels. Therefore, FOPEN_KEEP_CACHE is not used in this
+#	test (opens will invalidate the fuse cache).
+###
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../fallocate.rc
+. $(dirname $0)/../../volume.rc
+
+cleanup
+
+#cleate and start volume
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume create $V0 disperse 6 redundancy 2 $H0:$B0/${V0}{0..5}
+TEST $CLI volume set $V0 disperse.optimistic-change-log on
+TEST $CLI volume start $V0
+
+#Mount the volume
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "6" ec_child_up_count $V0 0
+
+#Check for fallocate and hole punch support
+require_fallocate -l 1m $M0/file
+require_fallocate -p -l 512k $M0/file && rm -f $M0/file
+
+#Write some data, punch a hole and verify the file content changes
+TEST dd if=/dev/urandom of=$M0/file bs=1024k count=1
+TEST cp $M0/file $M0/file.copy.pre
+TEST fallocate -p -o 512k -l 128k $M0/file
+TEST ! cmp $M0/file.copy.pre $M0/file
+TEST rm -f $M0/file $M0/file.copy.pre
+
+#Allocate some blocks, punch a hole and verify block allocation
+TEST fallocate -l 1m $M0/file
+blksz=`stat -c %B $M0/file`
+nblks=`stat -c %b $M0/file`
+TEST [ $(($blksz * $nblks)) -ge 1048576 ]
+TEST fallocate -p -o 512k -l 128k $M0/file
+nblks=`stat -c %b $M0/file`
+TEST [ $(($blksz * $nblks)) -lt $((933889)) ]
+TEST unlink $M0/file
+
+###Punch hole test cases without fallocate
+##With write
+#Touching starting boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 0 -l 500 $B0/test_file
+TEST fallocate -p -o 0 -l 500 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+#Touching boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 500 -l 1548 $B0/test_file
+TEST fallocate -p -o 500 -l 1548 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+#Not touching boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 500 -l 1000 $B0/test_file
+TEST fallocate -p -o 500 -l 1000 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+#Over boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 1500 -l 1000 $B0/test_file
+TEST fallocate -p -o 1500 -l 1000 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+###Punch hole test cases with fallocate
+##Without write
+
+#Zero size
+TEST dd if=/dev/urandom of=$M0/test_file bs=1024 count=8
+TEST ! fallocate -p -o 1500 -l 0 $M0/test_file
+
+#Negative size
+TEST ! fallocate -p -o 1500 -l -100 $M0/test_file
+TEST rm -f $M0/test_file
+
+#Touching boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 2048 -l 2048 $B0/test_file
+TEST fallocate -p -o 2048 -l 2048 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+#Touching boundary,multiple stripe
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 2048 -l 4096 $B0/test_file
+TEST fallocate -p -o 2048 -l 4096 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+##With write
+
+#Size ends in boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 600 -l 3496 $B0/test_file
+TEST fallocate -p -o 600 -l 3496 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+#Offset at boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 2048 -l 3072 $B0/test_file
+TEST fallocate -p -o 2048 -l 3072 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+TEST rm -f $B0/test_file $M0/test_file
+
+#Offset and Size not at boundary
+TEST dd if=/dev/urandom of=$B0/test_file bs=1024 count=8
+TEST cp $B0/test_file $M0/test_file
+TEST fallocate -p -o 1000 -l 3072 $B0/test_file
+TEST fallocate -p -o 1000 -l 3072 $M0/test_file
+TEST md5_sum=`get_md5_sum $B0/test_file`
+EXPECT $md5_sum get_md5_sum $M0/test_file
+#TEST rm -f $B0/test_file $M0/test_file
+
+#Data Corruption Tests
+#Kill brick1 and brick2
+TEST kill_brick $V0 $H0 $B0/${V0}0
+TEST kill_brick $V0 $H0 $B0/${V0}1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
+
+#Unmount and mount
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0;
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
+
+#verify md5 sum
+EXPECT $md5_sum get_md5_sum $M0/test_file
+
+#Bring up the bricks
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "6" ec_child_up_count $V0 0
+
+#Kill brick3 and brick4
+TEST kill_brick $V0 $H0 $B0/${V0}2
+TEST kill_brick $V0 $H0 $B0/${V0}3
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
+
+#Unmount and mount
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0;
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
+
+#verify md5 sum
+EXPECT $md5_sum get_md5_sum $M0/test_file
+
+#Bring up the bricks
+TEST $CLI volume start $V0 force
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "6" ec_child_up_count $V0 0
+
+#Kill brick5 and brick6
+TEST kill_brick $V0 $H0 $B0/${V0}4
+TEST kill_brick $V0 $H0 $B0/${V0}5
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
+
+#Unmount and mount
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0;
+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0;
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
+
+#verify md5 sum
+EXPECT $md5_sum get_md5_sum $M0/test_file
+
+cleanup
diff --git a/tests/include.rc b/tests/include.rc
index 73660127df1..7cd15a2d249 100644
--- a/tests/include.rc
+++ b/tests/include.rc
@@ -1230,3 +1230,10 @@ function STAT_INO()
                 echo 0
         fi
 }
+
+function get_md5_sum()
+{
+    local file=$1;
+    md5_sum=$(md5sum $file | awk '{print $1}');
+    echo $md5_sum
+}