From 61c347ba551162edb1c6abfa60ce6907baf7a1af Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 9 May 2019 14:15:11 +0100 Subject: 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 Signed-off-by: David Howells --- fs/afs/inode.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'fs/afs/inode.c') 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; } -- cgit v1.2.3