File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
new file mode 100644
index 0000000..f3e7278
--- /dev/null
+++ b/fs/dlm/lockspace.c
@@ -0,0 +1,917 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include "dlm_internal.h"
+#include "lockspace.h"
+#include "member.h"
+#include "recoverd.h"
+#include "dir.h"
+#include "lowcomms.h"
+#include "config.h"
+#include "memory.h"
+#include "lock.h"
+#include "recover.h"
+#include "requestqueue.h"
+#include "user.h"
+#include "ast.h"
+
+static int ls_count;
+static struct mutex ls_lock;
+static struct list_head lslist;
+static spinlock_t lslist_lock;
+static struct task_struct * scand_task;
+
+
+static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ ssize_t ret = len;
+ int n;
+ int rc = kstrtoint(buf, 0, &n);
+
+ if (rc)
+ return rc;
+ ls = dlm_find_lockspace_local(ls->ls_local_handle);
+ if (!ls)
+ return -EINVAL;
+
+ switch (n) {
+ case 0:
+ dlm_ls_stop(ls);
+ break;
+ case 1:
+ dlm_ls_start(ls);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ dlm_put_lockspace(ls);
+ return ret;
+}
+
+static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ int rc = kstrtoint(buf, 0, &ls->ls_uevent_result);
+
+ if (rc)
+ return rc;
+ set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags);
+ wake_up(&ls->ls_uevent_wait);
+ return len;
+}
+
+static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id);
+}
+
+static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ int rc = kstrtouint(buf, 0, &ls->ls_global_id);
+
+ if (rc)
+ return rc;
+ return len;
+}
+
+static ssize_t dlm_nodir_show(struct dlm_ls *ls, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%u\n", dlm_no_directory(ls));
+}
+
+static ssize_t dlm_nodir_store(struct dlm_ls *ls, const char *buf, size_t len)
+{
+ int val;
+ int rc = kstrtoint(buf, 0, &val);
+
+ if (rc)
+ return rc;
+ if (val == 1)
+ set_bit(LSFL_NODIR, &ls->ls_flags);
+ return len;
+}
+
+static ssize_t dlm_recover_status_show(struct dlm_ls *ls, char *buf)
+{
+ uint32_t status = dlm_recover_status(ls);
+ return snprintf(buf, PAGE_SIZE, "%x\n", status);
+}
+
+static ssize_t dlm_recover_nodeid_show(struct dlm_ls *ls, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", ls->ls_recover_nodeid);
+}
+
+struct dlm_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct dlm_ls *, char *);
+ ssize_t (*store)(struct dlm_ls *, const char *, size_t);
+};
+
+static struct dlm_attr dlm_attr_control = {
+ .attr = {.name = "control", .mode = S_IWUSR},
+ .store = dlm_control_store
+};
+
+static struct dlm_attr dlm_attr_event = {
+ .attr = {.name = "event_done", .mode = S_IWUSR},
+ .store = dlm_event_store
+};
+
+static struct dlm_attr dlm_attr_id = {
+ .attr = {.name = "id", .mode = S_IRUGO | S_IWUSR},
+ .show = dlm_id_show,
+ .store = dlm_id_store
+};
+
+static struct dlm_attr dlm_attr_nodir = {
+ .attr = {.name = "nodir", .mode = S_IRUGO | S_IWUSR},
+ .show = dlm_nodir_show,
+ .store = dlm_nodir_store
+};
+
+static struct dlm_attr dlm_attr_recover_status = {
+ .attr = {.name = "recover_status", .mode = S_IRUGO},
+ .show = dlm_recover_status_show
+};
+
+static struct dlm_attr dlm_attr_recover_nodeid = {
+ .attr = {.name = "recover_nodeid", .mode = S_IRUGO},
+ .show = dlm_recover_nodeid_show
+};
+
+static struct attribute *dlm_attrs[] = {
+ &dlm_attr_control.attr,
+ &dlm_attr_event.attr,
+ &dlm_attr_id.attr,
+ &dlm_attr_nodir.attr,
+ &dlm_attr_recover_status.attr,
+ &dlm_attr_recover_nodeid.attr,
+ NULL,
+};
+
+static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
+ struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
+ return a->show ? a->show(ls, buf) : 0;
+}
+
+static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
+ struct dlm_attr *a = container_of(attr, struct dlm_attr, attr);
+ return a->store ? a->store(ls, buf, len) : len;
+}
+
+static void lockspace_kobj_release(struct kobject *k)
+{
+ struct dlm_ls *ls = container_of(k, struct dlm_ls, ls_kobj);
+ kfree(ls);
+}
+
+static const struct sysfs_ops dlm_attr_ops = {
+ .show = dlm_attr_show,
+ .store = dlm_attr_store,
+};
+
+static struct kobj_type dlm_ktype = {
+ .default_attrs = dlm_attrs,
+ .sysfs_ops = &dlm_attr_ops,
+ .release = lockspace_kobj_release,
+};
+
+static struct kset *dlm_kset;
+
+static int do_uevent(struct dlm_ls *ls, int in)
+{
+ int error;
+
+ if (in)
+ kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE);
+ else
+ kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE);
+
+ log_rinfo(ls, "%s the lockspace group...", in ? "joining" : "leaving");
+
+ /* dlm_controld will see the uevent, do the necessary group management
+ and then write to sysfs to wake us */
+
+ error = wait_event_interruptible(ls->ls_uevent_wait,
+ test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags));
+
+ log_rinfo(ls, "group event done %d %d", error, ls->ls_uevent_result);
+
+ if (error)
+ goto out;
+
+ error = ls->ls_uevent_result;
+ out:
+ if (error)
+ log_error(ls, "group %s failed %d %d", in ? "join" : "leave",
+ error, ls->ls_uevent_result);
+ return error;
+}
+
+static int dlm_uevent(struct kset *kset, struct kobject *kobj,
+ struct kobj_uevent_env *env)
+{
+ struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
+
+ add_uevent_var(env, "LOCKSPACE=%s", ls->ls_name);
+ return 0;
+}
+
+static struct kset_uevent_ops dlm_uevent_ops = {
+ .uevent = dlm_uevent,
+};
+
+int __init dlm_lockspace_init(void)
+{
+ ls_count = 0;
+ mutex_init(&ls_lock);
+ INIT_LIST_HEAD(&lslist);
+ spin_lock_init(&lslist_lock);
+
+ dlm_kset = kset_create_and_add("dlm", &dlm_uevent_ops, kernel_kobj);
+ if (!dlm_kset) {
+ printk(KERN_WARNING "%s: can not create kset\n", __func__);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+void dlm_lockspace_exit(void)
+{
+ kset_unregister(dlm_kset);
+}
+
+static struct dlm_ls *find_ls_to_scan(void)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (time_after_eq(jiffies, ls->ls_scan_time +
+ dlm_config.ci_scan_secs * HZ)) {
+ spin_unlock(&lslist_lock);
+ return ls;
+ }
+ }
+ spin_unlock(&lslist_lock);
+ return NULL;
+}
+
+static int dlm_scand(void *data)
+{
+ struct dlm_ls *ls;
+
+ while (!kthread_should_stop()) {
+ ls = find_ls_to_scan();
+ if (ls) {
+ if (dlm_lock_recovery_try(ls)) {
+ ls->ls_scan_time = jiffies;
+ dlm_scan_rsbs(ls);
+ dlm_scan_timeout(ls);
+ dlm_scan_waiters(ls);
+ dlm_unlock_recovery(ls);
+ } else {
+ ls->ls_scan_time += HZ;
+ }
+ continue;
+ }
+ schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ);
+ }
+ return 0;
+}
+
+static int dlm_scand_start(void)
+{
+ struct task_struct *p;
+ int error = 0;
+
+ p = kthread_run(dlm_scand, NULL, "dlm_scand");
+ if (IS_ERR(p))
+ error = PTR_ERR(p);
+ else
+ scand_task = p;
+ return error;
+}
+
+static void dlm_scand_stop(void)
+{
+ kthread_stop(scand_task);
+}
+
+struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_global_id == id) {
+ ls->ls_count++;
+ goto out;
+ }
+ }
+ ls = NULL;
+ out:
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_local_handle == lockspace) {
+ ls->ls_count++;
+ goto out;
+ }
+ }
+ ls = NULL;
+ out:
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+struct dlm_ls *dlm_find_lockspace_device(int minor)
+{
+ struct dlm_ls *ls;
+
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (ls->ls_device.minor == minor) {
+ ls->ls_count++;
+ goto out;
+ }
+ }
+ ls = NULL;
+ out:
+ spin_unlock(&lslist_lock);
+ return ls;
+}
+
+void dlm_put_lockspace(struct dlm_ls *ls)
+{
+ spin_lock(&lslist_lock);
+ ls->ls_count--;
+ spin_unlock(&lslist_lock);
+}
+
+static void remove_lockspace(struct dlm_ls *ls)
+{
+ for (;;) {
+ spin_lock(&lslist_lock);
+ if (ls->ls_count == 0) {
+ WARN_ON(ls->ls_create_count != 0);
+ list_del(&ls->ls_list);
+ spin_unlock(&lslist_lock);
+ return;
+ }
+ spin_unlock(&lslist_lock);
+ ssleep(1);
+ }
+}
+
+static int threads_start(void)
+{
+ int error;
+
+ error = dlm_scand_start();
+ if (error) {
+ log_print("cannot start dlm_scand thread %d", error);
+ goto fail;
+ }
+
+ /* Thread for sending/receiving messages for all lockspace's */
+ error = dlm_lowcomms_start();
+ if (error) {
+ log_print("cannot start dlm lowcomms %d", error);
+ goto scand_fail;
+ }
+
+ return 0;
+
+ scand_fail:
+ dlm_scand_stop();
+ fail:
+ return error;
+}
+
+static void threads_stop(void)
+{
+ dlm_scand_stop();
+ dlm_lowcomms_stop();
+}
+
+static int new_lockspace(const char *name, const char *cluster,
+ uint32_t flags, int lvblen,
+ const struct dlm_lockspace_ops *ops, void *ops_arg,
+ int *ops_result, dlm_lockspace_t **lockspace)
+{
+ struct dlm_ls *ls;
+ int i, size, error;
+ int do_unreg = 0;
+ int namelen = strlen(name);
+
+ if (namelen > DLM_LOCKSPACE_LEN)
+ return -EINVAL;
+
+ if (!lvblen || (lvblen % 8))
+ return -EINVAL;
+
+ if (!try_module_get(THIS_MODULE))
+ return -EINVAL;
+
+ if (!dlm_user_daemon_available()) {
+ log_print("dlm user daemon not available");
+ error = -EUNATCH;
+ goto out;
+ }
+
+ if (ops && ops_result) {
+ if (!dlm_config.ci_recover_callbacks)
+ *ops_result = -EOPNOTSUPP;
+ else
+ *ops_result = 0;
+ }
+
+ if (dlm_config.ci_recover_callbacks && cluster &&
+ strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) {
+ log_print("dlm cluster name %s mismatch %s",
+ dlm_config.ci_cluster_name, cluster);
+ error = -EBADR;
+ goto out;
+ }
+
+ error = 0;
+
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ WARN_ON(ls->ls_create_count <= 0);
+ if (ls->ls_namelen != namelen)
+ continue;
+ if (memcmp(ls->ls_name, name, namelen))
+ continue;
+ if (flags & DLM_LSFL_NEWEXCL) {
+ error = -EEXIST;
+ break;
+ }
+ ls->ls_create_count++;
+ *lockspace = ls;
+ error = 1;
+ break;
+ }
+ spin_unlock(&lslist_lock);
+
+ if (error)
+ goto out;
+
+ error = -ENOMEM;
+
+ ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_NOFS);
+ if (!ls)
+ goto out;
+ memcpy(ls->ls_name, name, namelen);
+ ls->ls_namelen = namelen;
+ ls->ls_lvblen = lvblen;
+ ls->ls_count = 0;
+ ls->ls_flags = 0;
+ ls->ls_scan_time = jiffies;
+
+ if (ops && dlm_config.ci_recover_callbacks) {
+ ls->ls_ops = ops;
+ ls->ls_ops_arg = ops_arg;
+ }
+
+ if (flags & DLM_LSFL_TIMEWARN)
+ set_bit(LSFL_TIMEWARN, &ls->ls_flags);
+
+ /* ls_exflags are forced to match among nodes, and we don't
+ need to require all nodes to have some flags set */
+ ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS |
+ DLM_LSFL_NEWEXCL));
+
+ size = dlm_config.ci_rsbtbl_size;
+ ls->ls_rsbtbl_size = size;
+
+ ls->ls_rsbtbl = vmalloc(sizeof(struct dlm_rsbtable) * size);
+ if (!ls->ls_rsbtbl)
+ goto out_lsfree;
+ for (i = 0; i < size; i++) {
+ ls->ls_rsbtbl[i].keep.rb_node = NULL;
+ ls->ls_rsbtbl[i].toss.rb_node = NULL;
+ spin_lock_init(&ls->ls_rsbtbl[i].lock);
+ }
+
+ spin_lock_init(&ls->ls_remove_spin);
+
+ for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) {
+ ls->ls_remove_names[i] = kzalloc(DLM_RESNAME_MAXLEN+1,
+ GFP_KERNEL);
+ if (!ls->ls_remove_names[i])
+ goto out_rsbtbl;
+ }
+
+ idr_init(&ls->ls_lkbidr);
+ spin_lock_init(&ls->ls_lkbidr_spin);
+
+ INIT_LIST_HEAD(&ls->ls_waiters);
+ mutex_init(&ls->ls_waiters_mutex);
+ INIT_LIST_HEAD(&ls->ls_orphans);
+ mutex_init(&ls->ls_orphans_mutex);
+ INIT_LIST_HEAD(&ls->ls_timeout);
+ mutex_init(&ls->ls_timeout_mutex);
+
+ INIT_LIST_HEAD(&ls->ls_new_rsb);
+ spin_lock_init(&ls->ls_new_rsb_spin);
+
+ INIT_LIST_HEAD(&ls->ls_nodes);
+ INIT_LIST_HEAD(&ls->ls_nodes_gone);
+ ls->ls_num_nodes = 0;
+ ls->ls_low_nodeid = 0;
+ ls->ls_total_weight = 0;
+ ls->ls_node_array = NULL;
+
+ memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb));
+ ls->ls_stub_rsb.res_ls = ls;
+
+ ls->ls_debug_rsb_dentry = NULL;
+ ls->ls_debug_waiters_dentry = NULL;
+
+ init_waitqueue_head(&ls->ls_uevent_wait);
+ ls->ls_uevent_result = 0;
+ init_completion(&ls->ls_members_done);
+ ls->ls_members_result = -1;
+
+ mutex_init(&ls->ls_cb_mutex);
+ INIT_LIST_HEAD(&ls->ls_cb_delay);
+
+ ls->ls_recoverd_task = NULL;
+ mutex_init(&ls->ls_recoverd_active);
+ spin_lock_init(&ls->ls_recover_lock);
+ spin_lock_init(&ls->ls_rcom_spin);
+ get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t));
+ ls->ls_recover_status = 0;
+ ls->ls_recover_seq = 0;
+ ls->ls_recover_args = NULL;
+ init_rwsem(&ls->ls_in_recovery);
+ init_rwsem(&ls->ls_recv_active);
+ INIT_LIST_HEAD(&ls->ls_requestqueue);
+ mutex_init(&ls->ls_requestqueue_mutex);
+ mutex_init(&ls->ls_clear_proc_locks);
+
+ ls->ls_recover_buf = kmalloc(dlm_config.ci_buffer_size, GFP_NOFS);
+ if (!ls->ls_recover_buf)
+ goto out_lkbidr;
+
+ ls->ls_slot = 0;
+ ls->ls_num_slots = 0;
+ ls->ls_slots_size = 0;
+ ls->ls_slots = NULL;
+
+ INIT_LIST_HEAD(&ls->ls_recover_list);
+ spin_lock_init(&ls->ls_recover_list_lock);
+ idr_init(&ls->ls_recover_idr);
+ spin_lock_init(&ls->ls_recover_idr_lock);
+ ls->ls_recover_list_count = 0;
+ ls->ls_local_handle = ls;
+ init_waitqueue_head(&ls->ls_wait_general);
+ INIT_LIST_HEAD(&ls->ls_root_list);
+ init_rwsem(&ls->ls_root_sem);
+
+ spin_lock(&lslist_lock);
+ ls->ls_create_count = 1;
+ list_add(&ls->ls_list, &lslist);
+ spin_unlock(&lslist_lock);
+
+ if (flags & DLM_LSFL_FS) {
+ error = dlm_callback_start(ls);
+ if (error) {
+ log_error(ls, "can't start dlm_callback %d", error);
+ goto out_delist;
+ }
+ }
+
+ init_waitqueue_head(&ls->ls_recover_lock_wait);
+
+ /*
+ * Once started, dlm_recoverd first looks for ls in lslist, then
+ * initializes ls_in_recovery as locked in "down" mode. We need
+ * to wait for the wakeup from dlm_recoverd because in_recovery
+ * has to start out in down mode.
+ */
+
+ error = dlm_recoverd_start(ls);
+ if (error) {
+ log_error(ls, "can't start dlm_recoverd %d", error);
+ goto out_callback;
+ }
+
+ wait_event(ls->ls_recover_lock_wait,
+ test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
+
+ ls->ls_kobj.kset = dlm_kset;
+ error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL,
+ "%s", ls->ls_name);
+ if (error)
+ goto out_recoverd;
+ kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
+
+ /* let kobject handle freeing of ls if there's an error */
+ do_unreg = 1;
+
+ /* This uevent triggers dlm_controld in userspace to add us to the
+ group of nodes that are members of this lockspace (managed by the
+ cluster infrastructure.) Once it's done that, it tells us who the
+ current lockspace members are (via configfs) and then tells the
+ lockspace to start running (via sysfs) in dlm_ls_start(). */
+
+ error = do_uevent(ls, 1);
+ if (error)
+ goto out_recoverd;
+
+ wait_for_completion(&ls->ls_members_done);
+ error = ls->ls_members_result;
+ if (error)
+ goto out_members;
+
+ dlm_create_debug_file(ls);
+
+ log_rinfo(ls, "join complete");
+ *lockspace = ls;
+ return 0;
+
+ out_members:
+ do_uevent(ls, 0);
+ dlm_clear_members(ls);
+ kfree(ls->ls_node_array);
+ out_recoverd:
+ dlm_recoverd_stop(ls);
+ out_callback:
+ dlm_callback_stop(ls);
+ out_delist:
+ spin_lock(&lslist_lock);
+ list_del(&ls->ls_list);
+ spin_unlock(&lslist_lock);
+ idr_destroy(&ls->ls_recover_idr);
+ kfree(ls->ls_recover_buf);
+ out_lkbidr:
+ idr_destroy(&ls->ls_lkbidr);
+ for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) {
+ if (ls->ls_remove_names[i])
+ kfree(ls->ls_remove_names[i]);
+ }
+ out_rsbtbl:
+ vfree(ls->ls_rsbtbl);
+ out_lsfree:
+ if (do_unreg)
+ kobject_put(&ls->ls_kobj);
+ else
+ kfree(ls);
+ out:
+ module_put(THIS_MODULE);
+ return error;
+}
+
+int dlm_new_lockspace(const char *name, const char *cluster,
+ uint32_t flags, int lvblen,
+ const struct dlm_lockspace_ops *ops, void *ops_arg,
+ int *ops_result, dlm_lockspace_t **lockspace)
+{
+ int error = 0;
+
+ mutex_lock(&ls_lock);
+ if (!ls_count)
+ error = threads_start();
+ if (error)
+ goto out;
+
+ error = new_lockspace(name, cluster, flags, lvblen, ops, ops_arg,
+ ops_result, lockspace);
+ if (!error)
+ ls_count++;
+ if (error > 0)
+ error = 0;
+ if (!ls_count)
+ threads_stop();
+ out:
+ mutex_unlock(&ls_lock);
+ return error;
+}
+
+static int lkb_idr_is_local(int id, void *p, void *data)
+{
+ struct dlm_lkb *lkb = p;
+
+ return lkb->lkb_nodeid == 0 && lkb->lkb_grmode != DLM_LOCK_IV;
+}
+
+static int lkb_idr_is_any(int id, void *p, void *data)
+{
+ return 1;
+}
+
+static int lkb_idr_free(int id, void *p, void *data)
+{
+ struct dlm_lkb *lkb = p;
+
+ if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
+ dlm_free_lvb(lkb->lkb_lvbptr);
+
+ dlm_free_lkb(lkb);
+ return 0;
+}
+
+/* NOTE: We check the lkbidr here rather than the resource table.
+ This is because there may be LKBs queued as ASTs that have been unlinked
+ from their RSBs and are pending deletion once the AST has been delivered */
+
+static int lockspace_busy(struct dlm_ls *ls, int force)
+{
+ int rv;
+
+ spin_lock(&ls->ls_lkbidr_spin);
+ if (force == 0) {
+ rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_any, ls);
+ } else if (force == 1) {
+ rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_local, ls);
+ } else {
+ rv = 0;
+ }
+ spin_unlock(&ls->ls_lkbidr_spin);
+ return rv;
+}
+
+static int release_lockspace(struct dlm_ls *ls, int force)
+{
+ struct dlm_rsb *rsb;
+ struct rb_node *n;
+ int i, busy, rv;
+
+ busy = lockspace_busy(ls, force);
+
+ spin_lock(&lslist_lock);
+ if (ls->ls_create_count == 1) {
+ if (busy) {
+ rv = -EBUSY;
+ } else {
+ /* remove_lockspace takes ls off lslist */
+ ls->ls_create_count = 0;
+ rv = 0;
+ }
+ } else if (ls->ls_create_count > 1) {
+ rv = --ls->ls_create_count;
+ } else {
+ rv = -EINVAL;
+ }
+ spin_unlock(&lslist_lock);
+
+ if (rv) {
+ log_debug(ls, "release_lockspace no remove %d", rv);
+ return rv;
+ }
+
+ dlm_device_deregister(ls);
+
+ if (force < 3 && dlm_user_daemon_available())
+ do_uevent(ls, 0);
+
+ dlm_recoverd_stop(ls);
+
+ dlm_callback_stop(ls);
+
+ remove_lockspace(ls);
+
+ dlm_delete_debug_file(ls);
+
+ kfree(ls->ls_recover_buf);
+
+ /*
+ * Free all lkb's in idr
+ */
+
+ idr_for_each(&ls->ls_lkbidr, lkb_idr_free, ls);
+ idr_destroy(&ls->ls_lkbidr);
+
+ /*
+ * Free all rsb's on rsbtbl[] lists
+ */
+
+ for (i = 0; i < ls->ls_rsbtbl_size; i++) {
+ while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) {
+ rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+ rb_erase(n, &ls->ls_rsbtbl[i].keep);
+ dlm_free_rsb(rsb);
+ }
+
+ while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) {
+ rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+ rb_erase(n, &ls->ls_rsbtbl[i].toss);
+ dlm_free_rsb(rsb);
+ }
+ }
+
+ vfree(ls->ls_rsbtbl);
+
+ for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++)
+ kfree(ls->ls_remove_names[i]);
+
+ while (!list_empty(&ls->ls_new_rsb)) {
+ rsb = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb,
+ res_hashchain);
+ list_del(&rsb->res_hashchain);
+ dlm_free_rsb(rsb);
+ }
+
+ /*
+ * Free structures on any other lists
+ */
+
+ dlm_purge_requestqueue(ls);
+ kfree(ls->ls_recover_args);
+ dlm_clear_members(ls);
+ dlm_clear_members_gone(ls);
+ kfree(ls->ls_node_array);
+ log_rinfo(ls, "release_lockspace final free");
+ kobject_put(&ls->ls_kobj);
+ /* The ls structure will be freed when the kobject is done with */
+
+ module_put(THIS_MODULE);
+ return 0;
+}
+
+/*
+ * Called when a system has released all its locks and is not going to use the
+ * lockspace any longer. We free everything we're managing for this lockspace.
+ * Remaining nodes will go through the recovery process as if we'd died. The
+ * lockspace must continue to function as usual, participating in recoveries,
+ * until this returns.
+ *
+ * Force has 4 possible values:
+ * 0 - don't destroy locksapce if it has any LKBs
+ * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs
+ * 2 - destroy lockspace regardless of LKBs
+ * 3 - destroy lockspace as part of a forced shutdown
+ */
+
+int dlm_release_lockspace(void *lockspace, int force)
+{
+ struct dlm_ls *ls;
+ int error;
+
+ ls = dlm_find_lockspace_local(lockspace);
+ if (!ls)
+ return -EINVAL;
+ dlm_put_lockspace(ls);
+
+ mutex_lock(&ls_lock);
+ error = release_lockspace(ls, force);
+ if (!error)
+ ls_count--;
+ if (!ls_count)
+ threads_stop();
+ mutex_unlock(&ls_lock);
+
+ return error;
+}
+
+void dlm_stop_lockspaces(void)
+{
+ struct dlm_ls *ls;
+ int count;
+
+ restart:
+ count = 0;
+ spin_lock(&lslist_lock);
+ list_for_each_entry(ls, &lslist, ls_list) {
+ if (!test_bit(LSFL_RUNNING, &ls->ls_flags)) {
+ count++;
+ continue;
+ }
+ spin_unlock(&lslist_lock);
+ log_error(ls, "no userland control daemon, stopping lockspace");
+ dlm_ls_stop(ls);
+ goto restart;
+ }
+ spin_unlock(&lslist_lock);
+
+ if (count)
+ log_print("dlm user daemon left %d lockspaces", count);
+}
+