linux-kernel - [PATCH 5.18 042/112] fscache: Fix if condition in fscache_wait_on_volume

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Date:   Mon, 11 Jul 2022 11:06:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yue Hu <huyue2@...lpad.com>,
        David Howells <dhowells@...hat.com>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 5.18 042/112] fscache: Fix if condition in fscache_wait_on_volume_collision()

From: Yue Hu <huyue2@...lpad.com>

commit bf17455b9cbd4b10bf30d39c047307e1d774fb1a upstream.

After waiting for the volume to complete the acquisition with timeout,
the if condition under which potential volume collision occurs should be
acquire the volume is still pending rather than not pending so that we
will continue to wait until the pending flag is cleared. Also, use the
existing test pending wrapper directly instead of test_bit().

Fixes: 62ab63352350 ("fscache: Implement volume registration")
Signed-off-by: Yue Hu <huyue2@...lpad.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Reviewed-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Link: https://listman.redhat.com/archives/linux-cachefs/2022-May/006918.html
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/fscache/volume.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/fscache/volume.c
+++ b/fs/fscache/volume.c
@@ -143,7 +143,7 @@ static void fscache_wait_on_volume_colli
 {
 	wait_var_event_timeout(&candidate->flags,
 			       !fscache_is_acquire_pending(candidate), 20 * HZ);
-	if (!fscache_is_acquire_pending(candidate)) {
+	if (fscache_is_acquire_pending(candidate)) {
 		pr_notice("Potential volume collision new=%08x old=%08x",
 			  candidate->debug_id, collidee_debug_id);
 		fscache_stat(&fscache_n_volumes_collision);
@@ -182,7 +182,7 @@ static bool fscache_hash_volume(struct f
 	hlist_bl_add_head(&candidate->hash_link, h);
 	hlist_bl_unlock(h);
 
-	if (test_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, &candidate->flags))
+	if (fscache_is_acquire_pending(candidate))
 		fscache_wait_on_volume_collision(candidate, collidee_debug_id);
 	return true;