diff options
| author | David Howells <dhowells@redhat.com> | 2019-05-10 23:03:31 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2019-05-16 16:25:21 +0100 |
| commit | c7226e407b6065d3bda8bd9dc627663d2c505ea3 (patch) | |
| tree | ffdfd1eb1aa6c2096f4bc371b3347b57427665b9 | |
| parent | d9052dda8a39069312218f913d22d99c48d90004 (diff) | |
| download | linux-c7226e407b6065d3bda8bd9dc627663d2c505ea3.tar.bz2 | |
afs: Fix lock-wait/callback-break double locking
__afs_break_callback() holds vnode->lock around its call of
afs_lock_may_be_available() - which also takes that lock.
Fix this by not taking the lock in __afs_break_callback().
Also, there's no point checking the granted_locks and pending_locks queues;
it's sufficient to check lock_state, so move that check out of
afs_lock_may_be_available() into __afs_break_callback() to replace the
queue checks.
Fixes: e8d6c554126b ("AFS: implement file locking")
Signed-off-by: David Howells <dhowells@redhat.com>
| -rw-r--r-- | fs/afs/callback.c | 8 | ||||
| -rw-r--r-- | fs/afs/flock.c | 3 |
2 files changed, 1 insertions, 10 deletions
diff --git a/fs/afs/callback.c b/fs/afs/callback.c index 128f2dbe256a..4876079aa643 100644 --- a/fs/afs/callback.c +++ b/fs/afs/callback.c @@ -218,14 +218,8 @@ void __afs_break_callback(struct afs_vnode *vnode) vnode->cb_break++; afs_clear_permits(vnode); - spin_lock(&vnode->lock); - - _debug("break callback"); - - if (list_empty(&vnode->granted_locks) && - !list_empty(&vnode->pending_locks)) + if (vnode->lock_state == AFS_VNODE_LOCK_WAITING_FOR_CB) afs_lock_may_be_available(vnode); - spin_unlock(&vnode->lock); } } diff --git a/fs/afs/flock.c b/fs/afs/flock.c index 3501ef7ddbb4..c91cd201013f 100644 --- a/fs/afs/flock.c +++ b/fs/afs/flock.c @@ -41,9 +41,6 @@ void afs_lock_may_be_available(struct afs_vnode *vnode) { _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); - if (vnode->lock_state != AFS_VNODE_LOCK_WAITING_FOR_CB) - return; - spin_lock(&vnode->lock); if (vnode->lock_state == AFS_VNODE_LOCK_WAITING_FOR_CB) afs_next_locker(vnode, 0); |