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authorDavid Teigland <teigland@redhat.com>2014-10-17 11:05:50 -0500
committerDavid Teigland <teigland@redhat.com>2014-11-19 14:48:02 -0600
commit2ab4bd8ea3a6954bc79a9bbeb291cd6c2d6213a7 (patch)
treec15e4590760ba76c29f2fca34c1b1edf82186cbd
parent206c5f60a3d902bc4b56dab2de3e88de5eb06108 (diff)
dlm: adopt orphan locks
A process may exit, leaving an orphan lock in the lockspace. This adds the capability for another process to acquire the orphan lock. Acquiring the orphan just moves the lock from the orphan list onto the acquiring process's list of locks. An adopting process must specify the resource name and mode of the lock it wants to adopt. If a matching lock is found, the lock is moved to the caller's 's list of locks, and the lkid of the lock is returned like the lkid of a new lock. If an orphan with a different mode is found, then -EAGAIN is returned. If no orphan lock is found on the resource, then -ENOENT is returned. No async completion is used because the result is immediately available. Also, when orphans are purged, allow a zero nodeid to refer to the local nodeid so the caller does not need to look up the local nodeid. Signed-off-by: David Teigland <teigland@redhat.com>
-rw-r--r--fs/dlm/lock.c76
-rw-r--r--fs/dlm/lock.h3
-rw-r--r--fs/dlm/user.c13
-rw-r--r--include/uapi/linux/dlmconstants.h2
4 files changed, 89 insertions, 5 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);
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h
index 5e0c72e36a9b..ed8ebd3a8593 100644
--- a/fs/dlm/lock.h
+++ b/fs/dlm/lock.h
@@ -49,6 +49,9 @@ int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua, int mode,
int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
int mode, uint32_t flags, uint32_t lkid, char *lvb_in,
unsigned long timeout_cs);
+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);
int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
uint32_t flags, uint32_t lkid, char *lvb_in);
int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 142e21655eed..fb85f32e9eca 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -238,6 +238,7 @@ static int device_user_lock(struct dlm_user_proc *proc,
{
struct dlm_ls *ls;
struct dlm_user_args *ua;
+ uint32_t lkid;
int error = -ENOMEM;
ls = dlm_find_lockspace_local(proc->lockspace);
@@ -260,12 +261,20 @@ static int device_user_lock(struct dlm_user_proc *proc,
ua->bastaddr = params->bastaddr;
ua->xid = params->xid;
- if (params->flags & DLM_LKF_CONVERT)
+ if (params->flags & DLM_LKF_CONVERT) {
error = dlm_user_convert(ls, ua,
params->mode, params->flags,
params->lkid, params->lvb,
(unsigned long) params->timeout);
- else {
+ } else if (params->flags & DLM_LKF_ORPHAN) {
+ error = dlm_user_adopt_orphan(ls, ua,
+ params->mode, params->flags,
+ params->name, params->namelen,
+ (unsigned long) params->timeout,
+ &lkid);
+ if (!error)
+ error = lkid;
+ } else {
error = dlm_user_request(ls, ua,
params->mode, params->flags,
params->name, params->namelen,
diff --git a/include/uapi/linux/dlmconstants.h b/include/uapi/linux/dlmconstants.h
index 47bf08dc7566..2857bdc5b27b 100644
--- a/include/uapi/linux/dlmconstants.h
+++ b/include/uapi/linux/dlmconstants.h
@@ -114,7 +114,7 @@
*
* DLM_LKF_ORPHAN
*
- * not yet implemented
+ * Acquire an orphan lock.
*
* DLM_LKF_ALTPR
*