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Diffstat (limited to 'fs/dlm/lock.c')
-rw-r--r--fs/dlm/lock.c76
1 files changed, 74 insertions, 2 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 83f3d5520307..35502d4046f5 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -5886,6 +5886,78 @@ int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
return error;
}
+/*
+ * The caller asks for an orphan lock on a given resource with a given mode.
+ * If a matching lock exists, it's moved to the owner's list of locks and
+ * the lkid is returned.
+ */
+
+int dlm_user_adopt_orphan(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
+ int mode, uint32_t flags, void *name, unsigned int namelen,
+ unsigned long timeout_cs, uint32_t *lkid)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_user_args *ua;
+ int found_other_mode = 0;
+ int found = 0;
+ int rv = 0;
+
+ mutex_lock(&ls->ls_orphans_mutex);
+ list_for_each_entry(lkb, &ls->ls_orphans, lkb_ownqueue) {
+ if (lkb->lkb_resource->res_length != namelen)
+ continue;
+ if (memcmp(lkb->lkb_resource->res_name, name, namelen))
+ continue;
+ if (lkb->lkb_grmode != mode) {
+ found_other_mode = 1;
+ continue;
+ }
+
+ found = 1;
+ list_del_init(&lkb->lkb_ownqueue);
+ lkb->lkb_flags &= ~DLM_IFL_ORPHAN;
+ *lkid = lkb->lkb_id;
+ break;
+ }
+ mutex_unlock(&ls->ls_orphans_mutex);
+
+ if (!found && found_other_mode) {
+ rv = -EAGAIN;
+ goto out;
+ }
+
+ if (!found) {
+ rv = -ENOENT;
+ goto out;
+ }
+
+ lkb->lkb_exflags = flags;
+ lkb->lkb_ownpid = (int) current->pid;
+
+ ua = lkb->lkb_ua;
+
+ ua->proc = ua_tmp->proc;
+ ua->xid = ua_tmp->xid;
+ ua->castparam = ua_tmp->castparam;
+ ua->castaddr = ua_tmp->castaddr;
+ ua->bastparam = ua_tmp->bastparam;
+ ua->bastaddr = ua_tmp->bastaddr;
+ ua->user_lksb = ua_tmp->user_lksb;
+
+ /*
+ * The lkb reference from the ls_orphans list was not
+ * removed above, and is now considered the reference
+ * for the proc locks list.
+ */
+
+ spin_lock(&ua->proc->locks_spin);
+ list_add_tail(&lkb->lkb_ownqueue, &ua->proc->locks);
+ spin_unlock(&ua->proc->locks_spin);
+ out:
+ kfree(ua_tmp);
+ return rv;
+}
+
int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
uint32_t flags, uint32_t lkid, char *lvb_in)
{
@@ -6029,7 +6101,7 @@ static int orphan_proc_lock(struct dlm_ls *ls, struct dlm_lkb *lkb)
struct dlm_args args;
int error;
- hold_lkb(lkb);
+ hold_lkb(lkb); /* reference for the ls_orphans list */
mutex_lock(&ls->ls_orphans_mutex);
list_add_tail(&lkb->lkb_ownqueue, &ls->ls_orphans);
mutex_unlock(&ls->ls_orphans_mutex);
@@ -6217,7 +6289,7 @@ int dlm_user_purge(struct dlm_ls *ls, struct dlm_user_proc *proc,
{
int error = 0;
- if (nodeid != dlm_our_nodeid()) {
+ if (nodeid && (nodeid != dlm_our_nodeid())) {
error = send_purge(ls, nodeid, pid);
} else {
dlm_lock_recovery(ls);