linux-kernel - [PATCH 4.19 376/639] afs: Dont invalidate callback if AFS_VNODE_DIR

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Message-Id: <20200124093134.113405191@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:29:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 376/639] afs: Dont invalidate callback if AFS_VNODE_DIR_VALID not set

From: David Howells <dhowells@...hat.com>

[ Upstream commit d9052dda8a39069312218f913d22d99c48d90004 ]

Don't invalidate the callback promise on a directory if the
AFS_VNODE_DIR_VALID flag is not set (which indicates that the directory
contents are invalid, due to edit failure, callback break, page reclaim).

The directory will be reloaded next time the directory is accessed, so
clearing the callback flag at this point may race with a reload of the
directory and cancel it's recorded callback promise.

Fixes: f3ddee8dc4e2 ("afs: Fix directory handling")
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/inode.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 718fab2f151a1..e6f11da5461be 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -398,12 +398,9 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
 			vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
 			vnode->cb_v_break = vnode->volume->cb_v_break;
 			valid = false;
-		} else if (vnode->status.type == AFS_FTYPE_DIR &&
-			   (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) ||
-			    vnode->cb_expires_at - 10 <= now)) {
+		} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
 			valid = false;
-		} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) ||
-			   vnode->cb_expires_at - 10 <= now) {
+		} else if (vnode->cb_expires_at - 10 <= now) {
 			valid = false;
 		} else {
 			valid = true;
-- 
2.20.1