queue_work can return false and not queue anything, if the work is
already queued. If that happens in the case of a CB_RECALL, we'll have
taken an extra reference to the stid that will never be put. Ensure we
throw a warning in that case.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/nfsd/nfs4callback.c | 14 ++++++++++++--
fs/nfsd/nfs4state.c | 5 ++---
fs/nfsd/state.h | 2 +-
3 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 4ce328209f61..c4ee4a820a62 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1371,11 +1371,21 @@ void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
cb->cb_holds_slot = false;
}
-void nfsd4_run_cb(struct nfsd4_callback *cb)
+/**
+ * nfsd4_run_cb - queue up a callback job to run
+ * @cb: callback to queue
+ *
+ * Kick off a callback to do its thing. Returns false if it was already
+ * on a queue, true otherwise.
+ */
+bool nfsd4_run_cb(struct nfsd4_callback *cb)
{
+ bool queued;
struct nfs4_client *clp = cb->cb_clp;
nfsd41_cb_inflight_begin(clp);
- if (!nfsd4_queue_cb(cb))
+ queued = nfsd4_queue_cb(cb);
+ if (!queued)
nfsd41_cb_inflight_end(clp);
+ return queued;
}
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e116f50afcf2..c78c3223161e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4859,14 +4859,13 @@ static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
* we know it's safe to take a reference.
*/
refcount_inc(&dp->dl_stid.sc_count);
- nfsd4_run_cb(&dp->dl_recall);
+ WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
}
/* Called from break_lease() with flc_lock held. */
static bool
nfsd_break_deleg_cb(struct file_lock *fl)
{
- bool ret = false;
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
struct nfs4_file *fp = dp->dl_stid.sc_file;
struct nfs4_client *clp = dp->dl_stid.sc_client;
@@ -4892,7 +4891,7 @@ nfsd_break_deleg_cb(struct file_lock *fl)
fp->fi_had_conflict = true;
nfsd_break_one_deleg(dp);
spin_unlock(&fp->fi_lock);
- return ret;
+ return false;
}
/**
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index b3477087a9fc..e2daef3cc003 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -692,7 +692,7 @@ extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
-extern void nfsd4_run_cb(struct nfsd4_callback *cb);
+extern bool nfsd4_run_cb(struct nfsd4_callback *cb);
extern int nfsd4_create_callback_queue(void);
extern void nfsd4_destroy_callback_queue(void);
extern void nfsd4_shutdown_callback(struct nfs4_client *);
--
2.37.3
