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From ea71f09cd6ea45a2d1525519843fc553f0e46bec Mon Sep 17 00:00:00 2001
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From: Zhang Huan <zhanghuan@open-fs.com>
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Date: Tue, 5 Sep 2017 11:36:25 +0800
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Subject: [PATCH 104/128] cluster/dht: fix crash when deleting directories
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In DHT, after locks on all subvolumes are acquired, it would perform the
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following steps sequentially,
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1. send remove dir on all other subvolumes except the hashed one in a loop;
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2. wait for all pending rmdir to be done
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3. remove dir on the hashed subvolume
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The problem is that in step 1 there is a check to skip hashed subvolume
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in the loop. If the last subvolume to check is actually the
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hashed one, and step 3 is quickly done before the last and hashed
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subvolume is checked, by accessing shared context data be destroyed in
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step 3, would cause a crash.
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Fix by saving shared data in a local variable to access later in the
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loop.
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> BUG: 1490642
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> Signed-off-by: Zhang Huan <zhanghuan@open-fs.com>
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(cherry picked from commit 206120126d455417a81a48ae473d49be337e9463)
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Change-Id: I8db7cf7cb262d74efcb58eb00f02ea37df4be4e2
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BUG: 1519076
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Signed-off-by: N Balachandran <nbalacha@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/124755
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Raghavendra Gowdappa <rgowdapp@redhat.com>
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---
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xlators/cluster/dht/src/dht-common.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 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 c6944b2..f611278 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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@@ -8094,6 +8094,7 @@ dht_rmdir_lock_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
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dht_local_t *local = NULL;
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dht_conf_t *conf = NULL;
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int i = 0;
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+ xlator_t *hashed_subvol;
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VALIDATE_OR_GOTO (this->private, err);
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@@ -8111,9 +8112,10 @@ dht_rmdir_lock_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
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goto err;
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}
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+ hashed_subvol = local->hashed_subvol;
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for (i = 0; i < conf->subvolume_cnt; i++) {
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- if (local->hashed_subvol &&
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- (local->hashed_subvol == conf->subvolumes[i]))
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+ if (hashed_subvol &&
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+ (hashed_subvol == conf->subvolumes[i]))
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continue;
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STACK_WIND_COOKIE (frame, dht_rmdir_cbk, conf->subvolumes[i],
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--
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1.8.3.1
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