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From 32281b4b5cf79d0ef6f0c65775bb81093e1ba479 Mon Sep 17 00:00:00 2001
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From: Mohit Agrawal <moagrawa@redhat.com>
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Date: Wed, 24 Feb 2021 18:44:12 +0530
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Subject: [PATCH 536/538] dht: Ongoing IO is failed during volume shrink
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operation (#2188)
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In the commit (c878174) we have introduced a check
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to avoid stale layout issue.To avoid a stale layout
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issue dht has set a key along with layout at the time
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of wind a create fop and posix validates the parent
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layout based on the key value. If layout does not match
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it throw and error.In case of volume shrink layout has
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been changed by reabalance daemon and if layout does not
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matches dht is not able to wind a create fop successfully.
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Solution: To avoid the issue populate a key only while
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dht has wind a fop first time. After got an
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error in 2nd attempt dht takes a lock and then
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reattempt to wind a fop again.
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> Fixes: #2187
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> Change-Id: Ie018386e7823a11eea415496bb226ca032453a55
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> Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
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> (Cherry pick from commit da6ce622b722f7d12619c5860293faf03f7cd00c
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> Reviewed on upstream link https://github.com/gluster/glusterfs/pull/2188
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Bug: 1924044
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Change-Id: I7670dbe2d562b83db0af3753f994653ffdd49591
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Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/228941
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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-common.c | 41 ++++++++++++++++++++++++++----------
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1 file changed, 30 insertions(+), 11 deletions(-)
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diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
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index fe1d0ee..7425c1a 100644
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--- a/xlators/cluster/dht/src/dht-common.c
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+++ b/xlators/cluster/dht/src/dht-common.c
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@@ -8526,15 +8526,32 @@ dht_create_wind_to_avail_subvol(call_frame_t *frame, xlator_t *this,
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{
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dht_local_t *local = NULL;
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xlator_t *avail_subvol = NULL;
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+ int lk_count = 0;
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local = frame->local;
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if (!dht_is_subvol_filled(this, subvol)) {
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- gf_msg_debug(this->name, 0, "creating %s on %s", loc->path,
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- subvol->name);
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-
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- dht_set_parent_layout_in_dict(loc, this, local);
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-
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+ lk_count = local->lock[0].layout.parent_layout.lk_count;
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+ gf_msg_debug(this->name, 0, "creating %s on %s with lock_count %d",
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+ loc->path, subvol->name, lk_count);
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+ /*The function dht_set_parent_layout_in_dict sets the layout
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+ in dictionary and posix_create validates a layout before
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+ creating a file.In case if parent layout does not match
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+ with disk layout posix xlator throw an error but in case
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+ if volume is shrunk layout has been changed by rebalance daemon
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+ so we need to call this function only while a function is calling
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+ without taking any lock otherwise we would not able to populate a
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+ layout on disk in case if layout has changed.
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+ */
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+ if (!lk_count) {
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+ dht_set_parent_layout_in_dict(loc, this, local);
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+ } else {
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+ /* Delete a key to avoid layout validate if it was set by
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+ previous STACK_WIND attempt when a lock was not taken
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+ by dht_create
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+ */
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+ (void)dict_del_sizen(local->params, GF_PREOP_PARENT_KEY);
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+ }
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STACK_WIND_COOKIE(frame, dht_create_cbk, subvol, subvol,
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subvol->fops->create, loc, flags, mode, umask, fd,
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params);
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@@ -8554,12 +8571,14 @@ dht_create_wind_to_avail_subvol(call_frame_t *frame, xlator_t *this,
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goto out;
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}
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-
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- gf_msg_debug(this->name, 0, "creating %s on %s", loc->path,
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- subvol->name);
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-
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- dht_set_parent_layout_in_dict(loc, this, local);
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-
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+ lk_count = local->lock[0].layout.parent_layout.lk_count;
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+ gf_msg_debug(this->name, 0, "creating %s on %s with lk_count %d",
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+ loc->path, subvol->name, lk_count);
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+ if (!lk_count) {
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+ dht_set_parent_layout_in_dict(loc, this, local);
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+ } else {
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+ (void)dict_del_sizen(local->params, GF_PREOP_PARENT_KEY);
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+ }
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STACK_WIND_COOKIE(frame, dht_create_cbk, subvol, subvol,
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subvol->fops->create, loc, flags, mode, umask, fd,
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params);
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--
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1.8.3.1
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