/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2006 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.
+ * of the GNU General Public License version 2.
*/
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/fs.h>
#include <linux/delay.h>
-
-#include "lm_interface.h"
+#include <linux/lm_interface.h>
struct lmh_wrapper {
struct list_head lw_list;
- struct lm_lockops *lw_ops;
+ const struct lm_lockops *lw_ops;
};
+static int nolock_mount(char *table_name, char *host_data,
+ lm_callback_t cb, void *cb_data,
+ unsigned int min_lvb_size, int flags,
+ struct lm_lockstruct *lockstruct,
+ struct kobject *fskobj);
+
/* List of registered low-level locking protocols. A file system selects one
of them by name at mount time, e.g. lock_nolock, lock_dlm. */
-static struct list_head lmh_list;
-static struct semaphore lmh_lock;
+static const struct lm_lockops nolock_ops = {
+ .lm_proto_name = "lock_nolock",
+ .lm_mount = nolock_mount,
+};
+
+static struct lmh_wrapper nolock_proto = {
+ .lw_list = LIST_HEAD_INIT(nolock_proto.lw_list),
+ .lw_ops = &nolock_ops,
+};
+
+static LIST_HEAD(lmh_list);
+static DEFINE_MUTEX(lmh_lock);
+
+static int nolock_mount(char *table_name, char *host_data,
+ lm_callback_t cb, void *cb_data,
+ unsigned int min_lvb_size, int flags,
+ struct lm_lockstruct *lockstruct,
+ struct kobject *fskobj)
+{
+ char *c;
+ unsigned int jid;
+
+ c = strstr(host_data, "jid=");
+ if (!c)
+ jid = 0;
+ else {
+ c += 4;
+ sscanf(c, "%u", &jid);
+ }
+
+ lockstruct->ls_jid = jid;
+ lockstruct->ls_first = 1;
+ lockstruct->ls_lvb_size = min_lvb_size;
+ lockstruct->ls_ops = &nolock_ops;
+ lockstruct->ls_flags = LM_LSFLAG_LOCAL;
+
+ return 0;
+}
/**
- * gfs_register_lockproto - Register a low-level locking protocol
+ * gfs2_register_lockproto - Register a low-level locking protocol
* @proto: the protocol definition
*
* Returns: 0 on success, -EXXX on failure
*/
-int gfs_register_lockproto(struct lm_lockops *proto)
+int gfs2_register_lockproto(const struct lm_lockops *proto)
{
struct lmh_wrapper *lw;
- down(&lmh_lock);
+ mutex_lock(&lmh_lock);
list_for_each_entry(lw, &lmh_list, lw_list) {
if (!strcmp(lw->lw_ops->lm_proto_name, proto->lm_proto_name)) {
- up(&lmh_lock);
- printk("GFS2: protocol %s already exists\n",
+ mutex_unlock(&lmh_lock);
+ printk(KERN_INFO "GFS2: protocol %s already exists\n",
proto->lm_proto_name);
return -EEXIST;
}
}
- lw = kmalloc(sizeof(struct lmh_wrapper), GFP_KERNEL);
+ lw = kzalloc(sizeof(struct lmh_wrapper), GFP_KERNEL);
if (!lw) {
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
return -ENOMEM;
}
- memset(lw, 0, sizeof(struct lmh_wrapper));
lw->lw_ops = proto;
list_add(&lw->lw_list, &lmh_list);
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
return 0;
}
/**
- * gfs_unregister_lockproto - Unregister a low-level locking protocol
+ * gfs2_unregister_lockproto - Unregister a low-level locking protocol
* @proto: the protocol definition
*
*/
-void gfs_unregister_lockproto(struct lm_lockops *proto)
+void gfs2_unregister_lockproto(const struct lm_lockops *proto)
{
struct lmh_wrapper *lw;
- down(&lmh_lock);
+ mutex_lock(&lmh_lock);
list_for_each_entry(lw, &lmh_list, lw_list) {
if (!strcmp(lw->lw_ops->lm_proto_name, proto->lm_proto_name)) {
list_del(&lw->lw_list);
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
kfree(lw);
return;
}
}
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
- printk("GFS2: can't unregister lock protocol %s\n",
+ printk(KERN_WARNING "GFS2: can't unregister lock protocol %s\n",
proto->lm_proto_name);
}
* @table_name - the name of the lock space
* @host_data - data specific to this host
* @cb - the callback to the code using the lock module
- * @fsdata - data to pass back with the callback
+ * @sdp - The GFS2 superblock
* @min_lvb_size - the mininum LVB size that the caller can deal with
* @flags - LM_MFLAG_*
* @lockstruct - a structure returned describing the mount
*/
int gfs2_mount_lockproto(char *proto_name, char *table_name, char *host_data,
- lm_callback_t cb, lm_fsdata_t *fsdata,
+ lm_callback_t cb, void *cb_data,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj)
int try = 0;
int error, found;
- retry:
- down(&lmh_lock);
+
+retry:
+ mutex_lock(&lmh_lock);
+
+ if (list_empty(&nolock_proto.lw_list))
+ list_add(&nolock_proto.lw_list, &lmh_list);
found = 0;
list_for_each_entry(lw, &lmh_list, lw_list) {
if (!found) {
if (!try && capable(CAP_SYS_MODULE)) {
try = 1;
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
request_module(proto_name);
goto retry;
}
- printk("GFS2: can't find protocol %s\n", proto_name);
+ printk(KERN_INFO "GFS2: can't find protocol %s\n", proto_name);
error = -ENOENT;
goto out;
}
- if (!try_module_get(lw->lw_ops->lm_owner)) {
+ if (lw->lw_ops->lm_owner &&
+ !try_module_get(lw->lw_ops->lm_owner)) {
try = 0;
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
msleep(1000);
goto retry;
}
- error = lw->lw_ops->lm_mount(table_name, host_data, cb, fsdata,
+ error = lw->lw_ops->lm_mount(table_name, host_data, cb, cb_data,
min_lvb_size, flags, lockstruct, fskobj);
if (error)
module_put(lw->lw_ops->lm_owner);
- out:
- up(&lmh_lock);
+out:
+ mutex_unlock(&lmh_lock);
return error;
}
void gfs2_unmount_lockproto(struct lm_lockstruct *lockstruct)
{
- down(&lmh_lock);
- lockstruct->ls_ops->lm_unmount(lockstruct->ls_lockspace);
+ mutex_lock(&lmh_lock);
+ if (lockstruct->ls_ops->lm_unmount)
+ lockstruct->ls_ops->lm_unmount(lockstruct->ls_lockspace);
if (lockstruct->ls_ops->lm_owner)
module_put(lockstruct->ls_ops->lm_owner);
- up(&lmh_lock);
+ mutex_unlock(&lmh_lock);
}
/**
void gfs2_withdraw_lockproto(struct lm_lockstruct *lockstruct)
{
- down(&lmh_lock);
+ mutex_lock(&lmh_lock);
lockstruct->ls_ops->lm_withdraw(lockstruct->ls_lockspace);
if (lockstruct->ls_ops->lm_owner)
module_put(lockstruct->ls_ops->lm_owner);
- up(&lmh_lock);
-}
-
-void __init gfs2_init_lmh(void)
-{
- init_MUTEX(&lmh_lock);
- INIT_LIST_HEAD(&lmh_list);
+ mutex_unlock(&lmh_lock);
}
-EXPORT_SYMBOL_GPL(gfs_register_lockproto);
-EXPORT_SYMBOL_GPL(gfs_unregister_lockproto);
+EXPORT_SYMBOL_GPL(gfs2_register_lockproto);
+EXPORT_SYMBOL_GPL(gfs2_unregister_lockproto);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff