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From 67c89f4fc9a80c9ed4a7d78df57c1ca76f4adc3d Mon Sep 17 00:00:00 2001
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From: N Balachandran <nbalacha@redhat.com>
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Date: Tue, 17 Apr 2018 15:37:05 +0530
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Subject: [PATCH 237/260] cluster/dht: Fix dht_rename lock order
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Fixed dht_order_rename_lock to use the same inodelk ordering
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as that of the dht selfheal locks (dictionary order of
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lock subvolumes).
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upstream: https://review.gluster.org/#/c/19886/
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> Change-Id: Ia3f8353b33ea2fd3bc1ba7e8e777dda6c1d33e0d
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> fixes: bz#1568348
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> Signed-off-by: N Balachandran <nbalacha@redhat.com>
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Change-Id: I09022705f5b77af0f50a2bab4579d4d3cb902155
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BUG: 1565119
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Signed-off-by: N Balachandran <nbalacha@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/136451
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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xlators/cluster/dht/src/dht-rename.c | 65 ++++++++++++++++++++++++++----------
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1 file changed, 47 insertions(+), 18 deletions(-)
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diff --git a/xlators/cluster/dht/src/dht-rename.c b/xlators/cluster/dht/src/dht-rename.c
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index 3068499..ca6b5f4 100644
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--- a/xlators/cluster/dht/src/dht-rename.c
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+++ b/xlators/cluster/dht/src/dht-rename.c
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@@ -490,37 +490,66 @@ err:
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return 0;
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}
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+
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+/*
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+ * If the hashed subvolumes of both source and dst are the different,
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+ * lock in dictionary order of hashed subvol->name. This is important
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+ * in case the parent directory is the same for both src and dst to
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+ * prevent inodelk deadlocks when racing with a fix-layout op on the parent.
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+ *
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+ * If the hashed subvols are the same, use the gfid/name to determine
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+ * the order of taking locks to prevent entrylk deadlocks when the parent
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+ * dirs are the same.
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+ *
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+ */
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static void
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dht_order_rename_lock (call_frame_t *frame, loc_t **loc, xlator_t **subvol)
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{
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- dht_local_t *local = NULL;
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- char src[GF_UUID_BNAME_BUF_SIZE] = {0};
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- char dst[GF_UUID_BNAME_BUF_SIZE] = {0};
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+ int ret = 0;
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+ dht_local_t *local = NULL;
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+ char src[GF_UUID_BNAME_BUF_SIZE] = {0};
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+ char dst[GF_UUID_BNAME_BUF_SIZE] = {0};
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+
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local = frame->local;
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- if (local->loc.pargfid)
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- uuid_utoa_r (local->loc.pargfid, src);
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- else if (local->loc.parent)
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- uuid_utoa_r (local->loc.parent->gfid, src);
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+ if (local->src_hashed->name == local->dst_hashed->name) {
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+ ret = 0;
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+ } else {
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+ ret = strcmp (local->src_hashed->name, local->dst_hashed->name);
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+ }
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- strcat (src, local->loc.name);
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+ if (ret == 0) {
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- if (local->loc2.pargfid)
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- uuid_utoa_r (local->loc2.pargfid, dst);
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- else if (local->loc2.parent)
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- uuid_utoa_r (local->loc2.parent->gfid, dst);
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+ /* hashed subvols are the same for src and dst */
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+ /* Entrylks need to be ordered*/
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+ if (local->loc.pargfid)
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+ uuid_utoa_r (local->loc.pargfid, src);
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+ else if (local->loc.parent)
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+ uuid_utoa_r (local->loc.parent->gfid, src);
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- strcat (dst, local->loc2.name);
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+ strcat (src, local->loc.name);
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- if (strcmp(src, dst) > 0) {
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- local->current = &local->lock[1];
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- *loc = &local->loc2;
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- *subvol = local->dst_hashed;
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- } else {
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+ if (local->loc2.pargfid)
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+ uuid_utoa_r (local->loc2.pargfid, dst);
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+ else if (local->loc2.parent)
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+ uuid_utoa_r (local->loc2.parent->gfid, dst);
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+
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+ strcat (dst, local->loc2.name);
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+ ret = strcmp (src, dst);
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+ }
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+
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+ if (ret <= 0) {
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+ /*inodelk in dictionary order of hashed subvol names*/
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+ /*entrylk in dictionary order of gfid/basename */
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local->current = &local->lock[0];
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*loc = &local->loc;
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*subvol = local->src_hashed;
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+
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+ } else {
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+ local->current = &local->lock[1];
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+ *loc = &local->loc2;
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+ *subvol = local->dst_hashed;
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}
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return;
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--
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1.8.3.1
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