From 61c347ba551162edb1c6abfa60ce6907baf7a1af Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Thu, 9 May 2019 14:15:11 +0100
Subject: [PATCH] afs: Clear AFS_VNODE_CB_PROMISED if we detect callback expiry
Fix afs_validate() to clear AFS_VNODE_CB_PROMISED on a vnode if we detect
any condition that causes the callback promise to be broken implicitly,
including server break (cb_s_break), volume break (cb_v_break) or callback
expiry.
Fixes: ae3b7361dc0e ("afs: Fix validation/callback interaction")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/afs/inode.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index ba35b4824408..37c5de793353 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -571,7 +571,7 @@ bool afs_check_validity(struct afs_vnode *vnode)
struct afs_server *server;
struct afs_volume *volume = vnode->volume;
time64_t now = ktime_get_real_seconds();
- bool valid;
+ bool valid, need_clear = false;
unsigned int cb_break, cb_s_break, cb_v_break;
int seq = 0;
@@ -589,10 +589,13 @@ bool afs_check_validity(struct afs_vnode *vnode)
vnode->cb_v_break != cb_v_break) {
vnode->cb_s_break = cb_s_break;
vnode->cb_v_break = cb_v_break;
+ need_clear = true;
valid = false;
} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
+ need_clear = true;
valid = false;
} else if (vnode->cb_expires_at - 10 <= now) {
+ need_clear = true;
valid = false;
} else {
valid = true;
@@ -607,6 +610,15 @@ bool afs_check_validity(struct afs_vnode *vnode)
} while (need_seqretry(&vnode->cb_lock, seq));
done_seqretry(&vnode->cb_lock, seq);
+
+ if (need_clear) {
+ write_seqlock(&vnode->cb_lock);
+ if (cb_break == vnode->cb_break)
+ __afs_break_callback(vnode);
+ write_sequnlock(&vnode->cb_lock);
+ valid = false;
+ }
+
return valid;
}