[GFS2] The lock modules for GFS2
This patch contains the pluggable locking modules
for GFS2.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
new file mode 100644
index 0000000..92b1789
--- /dev/null
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -0,0 +1,240 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2005 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 "lock_dlm.h"
+
+int gdlm_drop_count;
+int gdlm_drop_period;
+struct lm_lockops gdlm_ops;
+
+
+static struct gdlm_ls *init_gdlm(lm_callback_t cb, lm_fsdata_t *fsdata,
+ int flags, char *table_name)
+{
+ struct gdlm_ls *ls;
+ char buf[256], *p;
+
+ ls = kmalloc(sizeof(struct gdlm_ls), GFP_KERNEL);
+ if (!ls)
+ return NULL;
+
+ memset(ls, 0, sizeof(struct gdlm_ls));
+
+ ls->drop_locks_count = gdlm_drop_count;
+ ls->drop_locks_period = gdlm_drop_period;
+
+ ls->fscb = cb;
+ ls->fsdata = fsdata;
+ ls->fsflags = flags;
+
+ spin_lock_init(&ls->async_lock);
+
+ INIT_LIST_HEAD(&ls->complete);
+ INIT_LIST_HEAD(&ls->blocking);
+ INIT_LIST_HEAD(&ls->delayed);
+ INIT_LIST_HEAD(&ls->submit);
+ INIT_LIST_HEAD(&ls->all_locks);
+
+ init_waitqueue_head(&ls->thread_wait);
+ init_waitqueue_head(&ls->wait_control);
+ ls->thread1 = NULL;
+ ls->thread2 = NULL;
+ ls->drop_time = jiffies;
+ ls->jid = -1;
+
+ strncpy(buf, table_name, 256);
+ buf[255] = '\0';
+
+ p = strstr(buf, ":");
+ if (!p) {
+ printk("lock_dlm: invalid table_name \"%s\"\n", table_name);
+ kfree(ls);
+ return NULL;
+ }
+ *p = '\0';
+ p++;
+
+ strncpy(ls->clustername, buf, 128);
+ strncpy(ls->fsname, p, 128);
+
+ return ls;
+}
+
+static int gdlm_mount(char *table_name, char *host_data,
+ lm_callback_t cb, lm_fsdata_t *fsdata,
+ unsigned int min_lvb_size, int flags,
+ struct lm_lockstruct *lockstruct)
+{
+ struct gdlm_ls *ls;
+ int error = -ENOMEM;
+
+ if (min_lvb_size > GDLM_LVB_SIZE)
+ goto out;
+
+ ls = init_gdlm(cb, fsdata, flags, table_name);
+ if (!ls)
+ goto out;
+
+ error = gdlm_init_threads(ls);
+ if (error)
+ goto out_free;
+
+ error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
+ &ls->dlm_lockspace, 0, GDLM_LVB_SIZE);
+ if (error) {
+ printk("lock_dlm: dlm_new_lockspace error %d\n", error);
+ goto out_thread;
+ }
+
+ error = gdlm_kobject_setup(ls);
+ if (error)
+ goto out_dlm;
+ kobject_uevent(&ls->kobj, KOBJ_MOUNT, NULL);
+
+ /* Now we depend on userspace to notice the new mount,
+ join the appropriate group, and do a write to our sysfs
+ "mounted" or "terminate" file. Before the start, userspace
+ must set "jid" and "first". */
+
+ error = wait_event_interruptible(ls->wait_control,
+ test_bit(DFL_JOIN_DONE, &ls->flags));
+ if (error)
+ goto out_sysfs;
+
+ if (test_bit(DFL_TERMINATE, &ls->flags)) {
+ error = -ERESTARTSYS;
+ goto out_sysfs;
+ }
+
+ lockstruct->ls_jid = ls->jid;
+ lockstruct->ls_first = ls->first;
+ lockstruct->ls_lockspace = ls;
+ lockstruct->ls_ops = &gdlm_ops;
+ lockstruct->ls_flags = 0;
+ lockstruct->ls_lvb_size = GDLM_LVB_SIZE;
+ return 0;
+
+ out_sysfs:
+ gdlm_kobject_release(ls);
+ out_dlm:
+ dlm_release_lockspace(ls->dlm_lockspace, 2);
+ out_thread:
+ gdlm_release_threads(ls);
+ out_free:
+ kfree(ls);
+ out:
+ return error;
+}
+
+static void gdlm_unmount(lm_lockspace_t *lockspace)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+ int rv;
+
+ log_debug("unmount flags %lx", ls->flags);
+
+ if (test_bit(DFL_WITHDRAW, &ls->flags)) {
+ gdlm_kobject_release(ls);
+ goto out;
+ }
+
+ kobject_uevent(&ls->kobj, KOBJ_UMOUNT, NULL);
+
+ wait_event_interruptible(ls->wait_control,
+ test_bit(DFL_LEAVE_DONE, &ls->flags));
+
+ gdlm_kobject_release(ls);
+ dlm_release_lockspace(ls->dlm_lockspace, 2);
+ gdlm_release_threads(ls);
+ rv = gdlm_release_all_locks(ls);
+ if (rv)
+ log_all("lm_dlm_unmount: %d stray locks freed", rv);
+ out:
+ kfree(ls);
+}
+
+static void gdlm_recovery_done(lm_lockspace_t *lockspace, unsigned int jid,
+ unsigned int message)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+ ls->recover_done = jid;
+ kobject_uevent(&ls->kobj, KOBJ_CHANGE, NULL);
+}
+
+static void gdlm_others_may_mount(lm_lockspace_t *lockspace)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+ ls->first_done = 1;
+ kobject_uevent(&ls->kobj, KOBJ_CHANGE, NULL);
+}
+
+static void gdlm_withdraw(lm_lockspace_t *lockspace)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+
+ /* userspace suspends locking on all other members */
+
+ kobject_uevent(&ls->kobj, KOBJ_OFFLINE, NULL);
+
+ wait_event_interruptible(ls->wait_control,
+ test_bit(DFL_WITHDRAW, &ls->flags));
+
+ dlm_release_lockspace(ls->dlm_lockspace, 2);
+ gdlm_release_threads(ls);
+ gdlm_release_all_locks(ls);
+
+ kobject_uevent(&ls->kobj, KOBJ_UMOUNT, NULL);
+
+ /* userspace leaves the mount group, we don't need to wait for
+ that to complete */
+}
+
+int gdlm_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, struct file_lock *fl)
+{
+ return -ENOSYS;
+}
+
+int gdlm_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, struct file_lock *fl)
+{
+ return -ENOSYS;
+}
+
+int gdlm_plock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, int cmd, struct file_lock *fl)
+{
+ return -ENOSYS;
+}
+
+struct lm_lockops gdlm_ops = {
+ lm_proto_name:"lock_dlm",
+ lm_mount:gdlm_mount,
+ lm_others_may_mount:gdlm_others_may_mount,
+ lm_unmount:gdlm_unmount,
+ lm_withdraw:gdlm_withdraw,
+ lm_get_lock:gdlm_get_lock,
+ lm_put_lock:gdlm_put_lock,
+ lm_lock:gdlm_lock,
+ lm_unlock:gdlm_unlock,
+ lm_plock:gdlm_plock,
+ lm_punlock:gdlm_punlock,
+ lm_plock_get:gdlm_plock_get,
+ lm_cancel:gdlm_cancel,
+ lm_hold_lvb:gdlm_hold_lvb,
+ lm_unhold_lvb:gdlm_unhold_lvb,
+ lm_sync_lvb:gdlm_sync_lvb,
+ lm_recovery_done:gdlm_recovery_done,
+ lm_owner:THIS_MODULE,
+};
+