*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
-** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
+** Copyright (C) 2004-2008 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
#include "lock.h"
#include "recover.h"
#include "requestqueue.h"
-
-#ifdef CONFIG_DLM_DEBUG
-int dlm_create_debug_file(struct dlm_ls *ls);
-void dlm_delete_debug_file(struct dlm_ls *ls);
-#else
-static inline int dlm_create_debug_file(struct dlm_ls *ls) { return 0; }
-static inline void dlm_delete_debug_file(struct dlm_ls *ls) { }
-#endif
+#include "user.h"
static int ls_count;
static struct mutex ls_lock;
.release = lockspace_kobj_release,
};
-static struct kset dlm_kset = {
- .ktype = &dlm_ktype,
-};
-
-static int kobject_setup(struct dlm_ls *ls)
-{
- char lsname[DLM_LOCKSPACE_LEN];
- int error;
-
- memset(lsname, 0, DLM_LOCKSPACE_LEN);
- snprintf(lsname, DLM_LOCKSPACE_LEN, "%s", ls->ls_name);
-
- error = kobject_set_name(&ls->ls_kobj, "%s", lsname);
- if (error)
- return error;
-
- ls->ls_kobj.kset = &dlm_kset;
- ls->ls_kobj.ktype = &dlm_ktype;
- return 0;
-}
+static struct kset *dlm_kset;
static int do_uevent(struct dlm_ls *ls, int in)
{
}
-int dlm_lockspace_init(void)
+int __init dlm_lockspace_init(void)
{
- int error;
-
ls_count = 0;
mutex_init(&ls_lock);
INIT_LIST_HEAD(&lslist);
spin_lock_init(&lslist_lock);
- kobject_set_name(&dlm_kset.kobj, "dlm");
- kobj_set_kset_s(&dlm_kset, kernel_subsys);
- error = kset_register(&dlm_kset);
- if (error)
- printk("dlm_lockspace_init: cannot register kset %d\n", error);
- return error;
+ dlm_kset = kset_create_and_add("dlm", NULL, 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);
+ kset_unregister(dlm_kset);
}
static int dlm_scand(void *data)
kthread_stop(scand_task);
}
-static struct dlm_ls *dlm_find_lockspace_name(char *name, int namelen)
-{
- struct dlm_ls *ls;
-
- spin_lock(&lslist_lock);
-
- list_for_each_entry(ls, &lslist, ls_list) {
- if (ls->ls_namelen == namelen &&
- memcmp(ls->ls_name, name, namelen) == 0)
- goto out;
- }
- ls = NULL;
- out:
- spin_unlock(&lslist_lock);
- return ls;
-}
-
struct dlm_ls *dlm_find_lockspace_global(uint32_t id)
{
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;
uint32_t flags, int lvblen)
{
struct dlm_ls *ls;
- int i, size, error = -ENOMEM;
+ int i, size, error;
int do_unreg = 0;
if (namelen > DLM_LOCKSPACE_LEN)
if (!try_module_get(THIS_MODULE))
return -EINVAL;
- ls = dlm_find_lockspace_name(name, namelen);
- if (ls) {
- *lockspace = ls;
+ 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++;
module_put(THIS_MODULE);
- return -EEXIST;
+ error = 1; /* not an error, return 0 */
+ break;
}
+ spin_unlock(&lslist_lock);
+
+ if (error < 0)
+ goto out;
+ if (error)
+ goto ret_zero;
+
+ error = -ENOMEM;
ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_KERNEL);
if (!ls)
ls->ls_allocation = GFP_KERNEL;
/* ls_exflags are forced to match among nodes, and we don't
- need to require all nodes to have TIMEWARN or FS set */
- ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS));
+ 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;
down_write(&ls->ls_in_recovery);
spin_lock(&lslist_lock);
+ ls->ls_create_count = 1;
list_add(&ls->ls_list, &lslist);
spin_unlock(&lslist_lock);
goto out_delist;
}
- error = kobject_setup(ls);
- if (error)
- goto out_stop;
-
- error = kobject_register(&ls->ls_kobj);
+ 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_stop;
+ kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
/* let kobject handle freeing of ls if there's an error */
do_unreg = 1;
dlm_create_debug_file(ls);
log_debug(ls, "join complete");
-
+ ret_zero:
*lockspace = ls;
return 0;
kfree(ls->ls_rsbtbl);
out_lsfree:
if (do_unreg)
- kobject_unregister(&ls->ls_kobj);
+ kobject_put(&ls->ls_kobj);
else
kfree(ls);
out:
struct dlm_lkb *lkb;
struct dlm_rsb *rsb;
struct list_head *head;
- int i;
- int busy = lockspace_busy(ls);
+ int i, busy, rv;
- if (busy > force)
- return -EBUSY;
+ busy = lockspace_busy(ls);
+
+ spin_lock(&lslist_lock);
+ if (ls->ls_create_count == 1) {
+ if (busy > force)
+ 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)
do_uevent(ls, 0);
dlm_del_ast(lkb);
if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY)
- free_lvb(lkb->lkb_lvbptr);
+ dlm_free_lvb(lkb->lkb_lvbptr);
- free_lkb(lkb);
+ dlm_free_lkb(lkb);
}
}
dlm_astd_resume();
res_hashchain);
list_del(&rsb->res_hashchain);
- free_rsb(rsb);
+ dlm_free_rsb(rsb);
}
head = &ls->ls_rsbtbl[i].toss;
rsb = list_entry(head->next, struct dlm_rsb,
res_hashchain);
list_del(&rsb->res_hashchain);
- free_rsb(rsb);
+ dlm_free_rsb(rsb);
}
}
dlm_clear_members(ls);
dlm_clear_members_gone(ls);
kfree(ls->ls_node_array);
- kobject_unregister(&ls->ls_kobj);
+ log_debug(ls, "release_lockspace final free");
+ kobject_put(&ls->ls_kobj);
/* The ls structure will be freed when the kobject is done with */
- mutex_lock(&ls_lock);
- ls_count--;
- if (!ls_count)
- threads_stop();
- mutex_unlock(&ls_lock);
-
module_put(THIS_MODULE);
return 0;
}
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);
- return release_lockspace(ls, force);
+
+ mutex_lock(&ls_lock);
+ error = release_lockspace(ls, force);
+ if (!error)
+ ls_count--;
+ else if (!ls_count)
+ threads_stop();
+ mutex_unlock(&ls_lock);
+
+ return error;
}
projects / linux-2.6-omap-h63xx.git / blobdiff