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From 0d2dd0b1395397fced99b62dd826d4ab18fb94f1 Mon Sep 17 00:00:00 2001
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From: Xavier Hernandez <xhernandez@datalab.es>
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Date: Fri, 7 Aug 2015 12:37:52 +0200
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Subject: [PATCH 318/320] cluster/ec: Fix write size in self-heal
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Self-heal was always using a fixed block size to heal a file. This
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was incorrect for dispersed volumes with a number of data bricks not
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being a power of 2.
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This patch adjusts the block size to a multiple of the stripe size
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of the volume. It also propagates errors detected during the data
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heal to stop healing the file and not mark it as healed.
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> Change-Id: I9ee3fde98a9e5d6116fd096ceef88686fd1d28e2
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> BUG: 1251446
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> Signed-off-by: Xavier Hernandez <xhernandez@datalab.es>
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> Reviewed-on: http://review.gluster.org/11862
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> Tested-by: NetBSD Build System <jenkins@build.gluster.org>
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> Tested-by: Gluster Build System <jenkins@build.gluster.com>
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> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
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3.7: http://review.gluster.org/11869
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BUG: 1241862
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Change-Id: I3bbe6ed6ff60b3efcc08d7425678bb9aeb5ddb11
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Signed-off-by: Xavier Hernandez <xhernandez@datalab.es>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/56691
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Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
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Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
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---
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tests/bugs/disperse/bug-1251446.t | 50 +++++++++++++++++++++++++++++++++++++
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xlators/cluster/ec/src/ec-data.h | 1 +
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xlators/cluster/ec/src/ec-heal.c | 9 ++++++
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3 files changed, 60 insertions(+), 0 deletions(-)
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create mode 100644 tests/bugs/disperse/bug-1251446.t
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diff --git a/tests/bugs/disperse/bug-1251446.t b/tests/bugs/disperse/bug-1251446.t
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new file mode 100644
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index 0000000..f805539
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--- /dev/null
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+++ b/tests/bugs/disperse/bug-1251446.t
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@@ -0,0 +1,50 @@
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+#!/bin/bash
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+
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+. $(dirname $0)/../../include.rc
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+. $(dirname $0)/../../volume.rc
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+
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+cleanup
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+
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+TEST glusterd
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+TEST pidof glusterd
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+TEST $CLI volume create $V0 disperse 4 redundancy 1 $H0:$B0/${V0}{0..3}
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+TEST $CLI volume start $V0
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+TEST glusterfs --entry-timeout=0 --attribute-timeout=0 -s $H0 --volfile-id $V0 $M0
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+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
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+
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+TEST dd if=/dev/urandom of=$M0/test1 bs=1024k count=2
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+cs=$(sha1sum $M0/test1 | awk '{ print $1 }')
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+
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+TEST kill_brick $V0 $H0 $B0/${V0}0
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+EXPECT '3' online_brick_count
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+
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+TEST cp $M0/test1 $M0/test2
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+EXPECT "$cs" echo $(sha1sum $M0/test2 | awk '{ print $1 }')
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+
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+TEST $CLI volume start $V0 force
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+EXPECT '4' online_brick_count
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+
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+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "[0-9][0-9]*" get_shd_process_pid
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+TEST $CLI volume heal $V0 full
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+EXPECT_WITHIN $HEAL_TIMEOUT "0" get_pending_heal_count $V0
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+
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+EXPECT "699392" stat -c "%s" $B0/${V0}0/test2
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+
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+# force cache clear
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+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
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+TEST $CLI volume stop $V0
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+TEST $CLI volume start $V0
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+TEST glusterfs --entry-timeout=0 --attribute-timeout=0 -s $H0 --volfile-id $V0 $M0
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+EXPECT_WITHIN $CHILD_UP_TIMEOUT "4" ec_child_up_count $V0 0
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+
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+TEST kill_brick $V0 $H0 $B0/${V0}3
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+EXPECT '3' online_brick_count
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+
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+EXPECT "$cs" echo $(sha1sum $M0/test2 | awk '{ print $1 }')
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+
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+## cleanup
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+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
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+TEST $CLI volume stop $V0
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+TEST $CLI volume delete $V0
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+
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+cleanup;
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diff --git a/xlators/cluster/ec/src/ec-data.h b/xlators/cluster/ec/src/ec-data.h
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index ec470e9..1008706 100644
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--- a/xlators/cluster/ec/src/ec-data.h
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+++ b/xlators/cluster/ec/src/ec-data.h
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@@ -285,6 +285,7 @@ struct _ec_heal
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fd_t *fd;
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int32_t partial;
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int32_t done;
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+ int32_t error;
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gf_boolean_t nameheal;
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uintptr_t available;
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uintptr_t good;
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diff --git a/xlators/cluster/ec/src/ec-heal.c b/xlators/cluster/ec/src/ec-heal.c
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index a7c97a5..fde7e31 100644
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--- a/xlators/cluster/ec/src/ec-heal.c
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+++ b/xlators/cluster/ec/src/ec-heal.c
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@@ -1779,6 +1779,7 @@ ec_heal_block_done (call_frame_t *frame, void *cookie, xlator_t *this,
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fop->heal = NULL;
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heal->fop = NULL;
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+ heal->error = op_ret < 0 ? op_errno : 0;
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syncbarrier_wake (heal->data);
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return 0;
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}
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@@ -1789,6 +1790,9 @@ ec_sync_heal_block (call_frame_t *frame, xlator_t *this, ec_heal_t *heal)
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ec_heal_block (frame, this, heal->bad|heal->good, EC_MINIMUM_ONE,
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ec_heal_block_done, heal);
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syncbarrier_wait (heal->data, 1);
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+ if (heal->error != 0) {
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+ return -heal->error;
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+ }
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if (heal->bad == 0)
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return -ENOTCONN;
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return 0;
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@@ -1814,6 +1818,11 @@ ec_rebuild_data (call_frame_t *frame, ec_t *ec, fd_t *fd, uint64_t size,
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pool = ec->xl->ctx->iobuf_pool;
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heal->total_size = size;
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heal->size = iobpool_default_pagesize (pool);
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+ /* We need to adjust the size to a multiple of the stripe size of the
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+ * volume. Otherwise writes would need to fill gaps (head and/or tail)
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+ * with existent data from the bad bricks. This could be garbage on a
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+ * damaged file or it could fail if there aren't enough bricks. */
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+ heal->size -= heal->size % ec->stripe_size;
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heal->bad = ec_char_array_to_mask (healed_sinks, ec->nodes);
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heal->good = ec_char_array_to_mask (sources, ec->nodes);
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heal->iatt.ia_type = IA_IFREG;
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--
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1.7.1
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