[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/Makefile b/fs/gfs2/locking/dlm/Makefile
new file mode 100644
index 0000000..d3bca02
--- /dev/null
+++ b/fs/gfs2/locking/dlm/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_GFS2_FS) += lock_dlm.o
+lock_dlm-y := lock.o main.o mount.o sysfs.o thread.o
+
diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c
new file mode 100644
index 0000000..daf59d5
--- /dev/null
+++ b/fs/gfs2/locking/dlm/lock.c
@@ -0,0 +1,537 @@
+/******************************************************************************
+*******************************************************************************
+**
+** 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"
+
+static char junk_lvb[GDLM_LVB_SIZE];
+
+static void queue_complete(struct gdlm_lock *lp)
+{
+ struct gdlm_ls *ls = lp->ls;
+
+ clear_bit(LFL_ACTIVE, &lp->flags);
+
+ spin_lock(&ls->async_lock);
+ list_add_tail(&lp->clist, &ls->complete);
+ spin_unlock(&ls->async_lock);
+ wake_up(&ls->thread_wait);
+}
+
+static inline void gdlm_ast(void *astarg)
+{
+ queue_complete((struct gdlm_lock *) astarg);
+}
+
+static inline void gdlm_bast(void *astarg, int mode)
+{
+ struct gdlm_lock *lp = astarg;
+ struct gdlm_ls *ls = lp->ls;
+
+ if (!mode) {
+ printk("lock_dlm: bast mode zero %x,%"PRIx64"\n",
+ lp->lockname.ln_type, lp->lockname.ln_number);
+ return;
+ }
+
+ spin_lock(&ls->async_lock);
+ if (!lp->bast_mode) {
+ list_add_tail(&lp->blist, &ls->blocking);
+ lp->bast_mode = mode;
+ } else if (lp->bast_mode < mode)
+ lp->bast_mode = mode;
+ spin_unlock(&ls->async_lock);
+ wake_up(&ls->thread_wait);
+}
+
+void gdlm_queue_delayed(struct gdlm_lock *lp)
+{
+ struct gdlm_ls *ls = lp->ls;
+
+ spin_lock(&ls->async_lock);
+ list_add_tail(&lp->delay_list, &ls->delayed);
+ spin_unlock(&ls->async_lock);
+}
+
+/* convert gfs lock-state to dlm lock-mode */
+
+static int16_t make_mode(int16_t lmstate)
+{
+ switch (lmstate) {
+ case LM_ST_UNLOCKED:
+ return DLM_LOCK_NL;
+ case LM_ST_EXCLUSIVE:
+ return DLM_LOCK_EX;
+ case LM_ST_DEFERRED:
+ return DLM_LOCK_CW;
+ case LM_ST_SHARED:
+ return DLM_LOCK_PR;
+ default:
+ GDLM_ASSERT(0, printk("unknown LM state %d\n", lmstate););
+ }
+}
+
+/* convert dlm lock-mode to gfs lock-state */
+
+int16_t gdlm_make_lmstate(int16_t dlmmode)
+{
+ switch (dlmmode) {
+ case DLM_LOCK_IV:
+ case DLM_LOCK_NL:
+ return LM_ST_UNLOCKED;
+ case DLM_LOCK_EX:
+ return LM_ST_EXCLUSIVE;
+ case DLM_LOCK_CW:
+ return LM_ST_DEFERRED;
+ case DLM_LOCK_PR:
+ return LM_ST_SHARED;
+ default:
+ GDLM_ASSERT(0, printk("unknown DLM mode %d\n", dlmmode););
+ }
+}
+
+/* verify agreement with GFS on the current lock state, NB: DLM_LOCK_NL and
+ DLM_LOCK_IV are both considered LM_ST_UNLOCKED by GFS. */
+
+static void check_cur_state(struct gdlm_lock *lp, unsigned int cur_state)
+{
+ int16_t cur = make_mode(cur_state);
+ if (lp->cur != DLM_LOCK_IV)
+ GDLM_ASSERT(lp->cur == cur, printk("%d, %d\n", lp->cur, cur););
+}
+
+static inline unsigned int make_flags(struct gdlm_lock *lp,
+ unsigned int gfs_flags,
+ int16_t cur, int16_t req)
+{
+ unsigned int lkf = 0;
+
+ if (gfs_flags & LM_FLAG_TRY)
+ lkf |= DLM_LKF_NOQUEUE;
+
+ if (gfs_flags & LM_FLAG_TRY_1CB) {
+ lkf |= DLM_LKF_NOQUEUE;
+ lkf |= DLM_LKF_NOQUEUEBAST;
+ }
+
+ if (gfs_flags & LM_FLAG_PRIORITY) {
+ lkf |= DLM_LKF_NOORDER;
+ lkf |= DLM_LKF_HEADQUE;
+ }
+
+ if (gfs_flags & LM_FLAG_ANY) {
+ if (req == DLM_LOCK_PR)
+ lkf |= DLM_LKF_ALTCW;
+ else if (req == DLM_LOCK_CW)
+ lkf |= DLM_LKF_ALTPR;
+ }
+
+ if (lp->lksb.sb_lkid != 0) {
+ lkf |= DLM_LKF_CONVERT;
+
+ /* Conversion deadlock avoidance by DLM */
+
+ if (!test_bit(LFL_FORCE_PROMOTE, &lp->flags) &&
+ !(lkf & DLM_LKF_NOQUEUE) &&
+ cur > DLM_LOCK_NL && req > DLM_LOCK_NL && cur != req)
+ lkf |= DLM_LKF_CONVDEADLK;
+ }
+
+ if (lp->lvb)
+ lkf |= DLM_LKF_VALBLK;
+
+ return lkf;
+}
+
+/* make_strname - convert GFS lock numbers to a string */
+
+static inline void make_strname(struct lm_lockname *lockname,
+ struct gdlm_strname *str)
+{
+ sprintf(str->name, "%8x%16"PRIx64, lockname->ln_type,
+ lockname->ln_number);
+ str->namelen = GDLM_STRNAME_BYTES;
+}
+
+int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
+ struct gdlm_lock **lpp)
+{
+ struct gdlm_lock *lp;
+
+ lp = kmalloc(sizeof(struct gdlm_lock), GFP_KERNEL);
+ if (!lp)
+ return -ENOMEM;
+
+ memset(lp, 0, sizeof(struct gdlm_lock));
+ lp->lockname = *name;
+ lp->ls = ls;
+ lp->cur = DLM_LOCK_IV;
+ lp->lvb = NULL;
+ lp->hold_null = NULL;
+ init_completion(&lp->ast_wait);
+ INIT_LIST_HEAD(&lp->clist);
+ INIT_LIST_HEAD(&lp->blist);
+ INIT_LIST_HEAD(&lp->delay_list);
+
+ spin_lock(&ls->async_lock);
+ list_add(&lp->all_list, &ls->all_locks);
+ ls->all_locks_count++;
+ spin_unlock(&ls->async_lock);
+
+ *lpp = lp;
+ return 0;
+}
+
+void gdlm_delete_lp(struct gdlm_lock *lp)
+{
+ struct gdlm_ls *ls = lp->ls;
+
+ spin_lock(&ls->async_lock);
+ if (!list_empty(&lp->clist))
+ list_del_init(&lp->clist);
+ if (!list_empty(&lp->blist))
+ list_del_init(&lp->blist);
+ if (!list_empty(&lp->delay_list))
+ list_del_init(&lp->delay_list);
+ GDLM_ASSERT(!list_empty(&lp->all_list),);
+ list_del_init(&lp->all_list);
+ ls->all_locks_count--;
+ spin_unlock(&ls->async_lock);
+
+ kfree(lp);
+}
+
+int gdlm_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ lm_lock_t **lockp)
+{
+ struct gdlm_lock *lp;
+ int error;
+
+ error = gdlm_create_lp((struct gdlm_ls *) lockspace, name, &lp);
+
+ *lockp = (lm_lock_t *) lp;
+ return error;
+}
+
+void gdlm_put_lock(lm_lock_t *lock)
+{
+ gdlm_delete_lp((struct gdlm_lock *) lock);
+}
+
+void gdlm_do_lock(struct gdlm_lock *lp, struct dlm_range *range)
+{
+ struct gdlm_ls *ls = lp->ls;
+ struct gdlm_strname str;
+ int error, bast = 1;
+
+ /*
+ * When recovery is in progress, delay lock requests for submission
+ * once recovery is done. Requests for recovery (NOEXP) and unlocks
+ * can pass.
+ */
+
+ if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
+ !test_bit(LFL_NOBLOCK, &lp->flags) && lp->req != DLM_LOCK_NL) {
+ gdlm_queue_delayed(lp);
+ return;
+ }
+
+ /*
+ * Submit the actual lock request.
+ */
+
+ if (test_bit(LFL_NOBAST, &lp->flags))
+ bast = 0;
+
+ make_strname(&lp->lockname, &str);
+
+ set_bit(LFL_ACTIVE, &lp->flags);
+
+ log_debug("lk %x,%"PRIx64" id %x %d,%d %x", lp->lockname.ln_type,
+ lp->lockname.ln_number, lp->lksb.sb_lkid,
+ lp->cur, lp->req, lp->lkf);
+
+ error = dlm_lock(ls->dlm_lockspace, lp->req, &lp->lksb, lp->lkf,
+ str.name, str.namelen, 0, gdlm_ast, (void *) lp,
+ bast ? gdlm_bast : NULL, range);
+
+ if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) {
+ lp->lksb.sb_status = -EAGAIN;
+ queue_complete(lp);
+ error = 0;
+ }
+
+ GDLM_ASSERT(!error,
+ printk("%s: num=%x,%"PRIx64" err=%d cur=%d req=%d lkf=%x\n",
+ ls->fsname, lp->lockname.ln_type,
+ lp->lockname.ln_number, error, lp->cur, lp->req,
+ lp->lkf););
+}
+
+void gdlm_do_unlock(struct gdlm_lock *lp)
+{
+ unsigned int lkf = 0;
+ int error;
+
+ set_bit(LFL_DLM_UNLOCK, &lp->flags);
+ set_bit(LFL_ACTIVE, &lp->flags);
+
+ if (lp->lvb)
+ lkf = DLM_LKF_VALBLK;
+
+ log_debug("un %x,%"PRIx64" %x %d %x", lp->lockname.ln_type,
+ lp->lockname.ln_number, lp->lksb.sb_lkid, lp->cur, lkf);
+
+ error = dlm_unlock(lp->ls->dlm_lockspace, lp->lksb.sb_lkid, lkf,
+ NULL, lp);
+
+ GDLM_ASSERT(!error,
+ printk("%s: error=%d num=%x,%"PRIx64" lkf=%x flags=%lx\n",
+ lp->ls->fsname, error, lp->lockname.ln_type,
+ lp->lockname.ln_number, lkf, lp->flags););
+}
+
+unsigned int gdlm_lock(lm_lock_t *lock, unsigned int cur_state,
+ unsigned int req_state, unsigned int flags)
+{
+ struct gdlm_lock *lp = (struct gdlm_lock *) lock;
+
+ clear_bit(LFL_DLM_CANCEL, &lp->flags);
+ if (flags & LM_FLAG_NOEXP)
+ set_bit(LFL_NOBLOCK, &lp->flags);
+
+ check_cur_state(lp, cur_state);
+ lp->req = make_mode(req_state);
+ lp->lkf = make_flags(lp, flags, lp->cur, lp->req);
+
+ gdlm_do_lock(lp, NULL);
+ return LM_OUT_ASYNC;
+}
+
+unsigned int gdlm_unlock(lm_lock_t *lock, unsigned int cur_state)
+{
+ struct gdlm_lock *lp = (struct gdlm_lock *) lock;
+
+ clear_bit(LFL_DLM_CANCEL, &lp->flags);
+ if (lp->cur == DLM_LOCK_IV)
+ return 0;
+ gdlm_do_unlock(lp);
+ return LM_OUT_ASYNC;
+}
+
+void gdlm_cancel(lm_lock_t *lock)
+{
+ struct gdlm_lock *lp = (struct gdlm_lock *) lock;
+ struct gdlm_ls *ls = lp->ls;
+ int error, delay_list = 0;
+
+ if (test_bit(LFL_DLM_CANCEL, &lp->flags))
+ return;
+
+ log_all("gdlm_cancel %x,%"PRIx64" flags %lx",
+ lp->lockname.ln_type, lp->lockname.ln_number, lp->flags);
+
+ spin_lock(&ls->async_lock);
+ if (!list_empty(&lp->delay_list)) {
+ list_del_init(&lp->delay_list);
+ delay_list = 1;
+ }
+ spin_unlock(&ls->async_lock);
+
+ if (delay_list) {
+ set_bit(LFL_CANCEL, &lp->flags);
+ set_bit(LFL_ACTIVE, &lp->flags);
+ queue_complete(lp);
+ return;
+ }
+
+ if (!test_bit(LFL_ACTIVE, &lp->flags) ||
+ test_bit(LFL_DLM_UNLOCK, &lp->flags)) {
+ log_all("gdlm_cancel skip %x,%"PRIx64" flags %lx",
+ lp->lockname.ln_type, lp->lockname.ln_number,
+ lp->flags);
+ return;
+ }
+
+ /* the lock is blocked in the dlm */
+
+ set_bit(LFL_DLM_CANCEL, &lp->flags);
+ set_bit(LFL_ACTIVE, &lp->flags);
+
+ error = dlm_unlock(ls->dlm_lockspace, lp->lksb.sb_lkid, DLM_LKF_CANCEL,
+ NULL, lp);
+
+ log_all("gdlm_cancel rv %d %x,%"PRIx64" flags %lx", error,
+ lp->lockname.ln_type, lp->lockname.ln_number, lp->flags);
+
+ if (error == -EBUSY)
+ clear_bit(LFL_DLM_CANCEL, &lp->flags);
+}
+
+int gdlm_add_lvb(struct gdlm_lock *lp)
+{
+ char *lvb;
+
+ lvb = kmalloc(GDLM_LVB_SIZE, GFP_KERNEL);
+ if (!lvb)
+ return -ENOMEM;
+
+ memset(lvb, 0, GDLM_LVB_SIZE);
+
+ lp->lksb.sb_lvbptr = lvb;
+ lp->lvb = lvb;
+ return 0;
+}
+
+void gdlm_del_lvb(struct gdlm_lock *lp)
+{
+ kfree(lp->lvb);
+ lp->lvb = NULL;
+ lp->lksb.sb_lvbptr = NULL;
+}
+
+/* This can do a synchronous dlm request (requiring a lock_dlm thread to get
+ the completion) because gfs won't call hold_lvb() during a callback (from
+ the context of a lock_dlm thread). */
+
+static int hold_null_lock(struct gdlm_lock *lp)
+{
+ struct gdlm_lock *lpn = NULL;
+ int error;
+
+ if (lp->hold_null) {
+ printk("lock_dlm: lvb already held\n");
+ return 0;
+ }
+
+ error = gdlm_create_lp(lp->ls, &lp->lockname, &lpn);
+ if (error)
+ goto out;
+
+ lpn->lksb.sb_lvbptr = junk_lvb;
+ lpn->lvb = junk_lvb;
+
+ lpn->req = DLM_LOCK_NL;
+ lpn->lkf = DLM_LKF_VALBLK | DLM_LKF_EXPEDITE;
+ set_bit(LFL_NOBAST, &lpn->flags);
+ set_bit(LFL_INLOCK, &lpn->flags);
+
+ init_completion(&lpn->ast_wait);
+ gdlm_do_lock(lpn, NULL);
+ wait_for_completion(&lpn->ast_wait);
+ error = lp->lksb.sb_status;
+ if (error) {
+ printk("lock_dlm: hold_null_lock dlm error %d\n", error);
+ gdlm_delete_lp(lpn);
+ lpn = NULL;
+ }
+ out:
+ lp->hold_null = lpn;
+ return error;
+}
+
+/* This cannot do a synchronous dlm request (requiring a lock_dlm thread to get
+ the completion) because gfs may call unhold_lvb() during a callback (from
+ the context of a lock_dlm thread) which could cause a deadlock since the
+ other lock_dlm thread could be engaged in recovery. */
+
+static void unhold_null_lock(struct gdlm_lock *lp)
+{
+ struct gdlm_lock *lpn = lp->hold_null;
+
+ GDLM_ASSERT(lpn,);
+ lpn->lksb.sb_lvbptr = NULL;
+ lpn->lvb = NULL;
+ set_bit(LFL_UNLOCK_DELETE, &lpn->flags);
+ gdlm_do_unlock(lpn);
+ lp->hold_null = NULL;
+}
+
+/* Acquire a NL lock because gfs requires the value block to remain
+ intact on the resource while the lvb is "held" even if it's holding no locks
+ on the resource. */
+
+int gdlm_hold_lvb(lm_lock_t *lock, char **lvbp)
+{
+ struct gdlm_lock *lp = (struct gdlm_lock *) lock;
+ int error;
+
+ error = gdlm_add_lvb(lp);
+ if (error)
+ return error;
+
+ *lvbp = lp->lvb;
+
+ error = hold_null_lock(lp);
+ if (error)
+ gdlm_del_lvb(lp);
+
+ return error;
+}
+
+void gdlm_unhold_lvb(lm_lock_t *lock, char *lvb)
+{
+ struct gdlm_lock *lp = (struct gdlm_lock *) lock;
+
+ unhold_null_lock(lp);
+ gdlm_del_lvb(lp);
+}
+
+void gdlm_sync_lvb(lm_lock_t *lock, char *lvb)
+{
+ struct gdlm_lock *lp = (struct gdlm_lock *) lock;
+
+ if (lp->cur != DLM_LOCK_EX)
+ return;
+
+ init_completion(&lp->ast_wait);
+ set_bit(LFL_SYNC_LVB, &lp->flags);
+
+ lp->req = DLM_LOCK_EX;
+ lp->lkf = make_flags(lp, 0, lp->cur, lp->req);
+
+ gdlm_do_lock(lp, NULL);
+ wait_for_completion(&lp->ast_wait);
+}
+
+void gdlm_submit_delayed(struct gdlm_ls *ls)
+{
+ struct gdlm_lock *lp, *safe;
+
+ spin_lock(&ls->async_lock);
+ list_for_each_entry_safe(lp, safe, &ls->delayed, delay_list) {
+ list_del_init(&lp->delay_list);
+ list_add_tail(&lp->delay_list, &ls->submit);
+ }
+ spin_unlock(&ls->async_lock);
+ wake_up(&ls->thread_wait);
+}
+
+int gdlm_release_all_locks(struct gdlm_ls *ls)
+{
+ struct gdlm_lock *lp, *safe;
+ int count = 0;
+
+ spin_lock(&ls->async_lock);
+ list_for_each_entry_safe(lp, safe, &ls->all_locks, all_list) {
+ list_del_init(&lp->all_list);
+
+ if (lp->lvb && lp->lvb != junk_lvb)
+ kfree(lp->lvb);
+ kfree(lp);
+ count++;
+ }
+ spin_unlock(&ls->async_lock);
+
+ return count;
+}
+
diff --git a/fs/gfs2/locking/dlm/main.c b/fs/gfs2/locking/dlm/main.c
new file mode 100644
index 0000000..3ced92e
--- /dev/null
+++ b/fs/gfs2/locking/dlm/main.c
@@ -0,0 +1,58 @@
+/******************************************************************************
+*******************************************************************************
+**
+** 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 <linux/init.h>
+
+#include "lock_dlm.h"
+
+extern int gdlm_drop_count;
+extern int gdlm_drop_period;
+
+extern struct lm_lockops gdlm_ops;
+
+int __init init_lock_dlm(void)
+{
+ int error;
+
+ error = lm_register_proto(&gdlm_ops);
+ if (error) {
+ printk("lock_dlm: can't register protocol: %d\n", error);
+ return error;
+ }
+
+ error = gdlm_sysfs_init();
+ if (error) {
+ lm_unregister_proto(&gdlm_ops);
+ return error;
+ }
+
+ gdlm_drop_count = GDLM_DROP_COUNT;
+ gdlm_drop_period = GDLM_DROP_PERIOD;
+
+ printk("Lock_DLM (built %s %s) installed\n", __DATE__, __TIME__);
+ return 0;
+}
+
+void __exit exit_lock_dlm(void)
+{
+ lm_unregister_proto(&gdlm_ops);
+ gdlm_sysfs_exit();
+}
+
+module_init(init_lock_dlm);
+module_exit(exit_lock_dlm);
+
+MODULE_DESCRIPTION("GFS DLM Locking Module");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
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,
+};
+
diff --git a/fs/gfs2/locking/dlm/sysfs.c b/fs/gfs2/locking/dlm/sysfs.c
new file mode 100644
index 0000000..8964733
--- /dev/null
+++ b/fs/gfs2/locking/dlm/sysfs.c
@@ -0,0 +1,315 @@
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) 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 <linux/ctype.h>
+#include <linux/stat.h>
+
+#include "lock_dlm.h"
+
+static ssize_t gdlm_block_show(struct gdlm_ls *ls, char *buf)
+{
+ ssize_t ret;
+ int val = 0;
+
+ if (test_bit(DFL_BLOCK_LOCKS, &ls->flags))
+ val = 1;
+ ret = sprintf(buf, "%d\n", val);
+ return ret;
+}
+
+static ssize_t gdlm_block_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+ ssize_t ret = len;
+ int val;
+
+ val = simple_strtol(buf, NULL, 0);
+
+ if (val == 1)
+ set_bit(DFL_BLOCK_LOCKS, &ls->flags);
+ else if (val == 0) {
+ clear_bit(DFL_BLOCK_LOCKS, &ls->flags);
+ gdlm_submit_delayed(ls);
+ } else
+ ret = -EINVAL;
+ return ret;
+}
+
+static ssize_t gdlm_mounted_show(struct gdlm_ls *ls, char *buf)
+{
+ ssize_t ret;
+ int val = -2;
+
+ if (test_bit(DFL_TERMINATE, &ls->flags))
+ val = -1;
+ else if (test_bit(DFL_LEAVE_DONE, &ls->flags))
+ val = 0;
+ else if (test_bit(DFL_JOIN_DONE, &ls->flags))
+ val = 1;
+ ret = sprintf(buf, "%d\n", val);
+ return ret;
+}
+
+static ssize_t gdlm_mounted_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+ ssize_t ret = len;
+ int val;
+
+ val = simple_strtol(buf, NULL, 0);
+
+ if (val == 1)
+ set_bit(DFL_JOIN_DONE, &ls->flags);
+ else if (val == 0)
+ set_bit(DFL_LEAVE_DONE, &ls->flags);
+ else if (val == -1) {
+ set_bit(DFL_TERMINATE, &ls->flags);
+ set_bit(DFL_JOIN_DONE, &ls->flags);
+ set_bit(DFL_LEAVE_DONE, &ls->flags);
+ } else
+ ret = -EINVAL;
+ wake_up(&ls->wait_control);
+ return ret;
+}
+
+static ssize_t gdlm_withdraw_show(struct gdlm_ls *ls, char *buf)
+{
+ ssize_t ret;
+ int val = 0;
+
+ if (test_bit(DFL_WITHDRAW, &ls->flags))
+ val = 1;
+ ret = sprintf(buf, "%d\n", val);
+ return ret;
+}
+
+static ssize_t gdlm_withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+ ssize_t ret = len;
+ int val;
+
+ val = simple_strtol(buf, NULL, 0);
+
+ if (val == 1)
+ set_bit(DFL_WITHDRAW, &ls->flags);
+ else
+ ret = -EINVAL;
+ wake_up(&ls->wait_control);
+ return ret;
+}
+
+static ssize_t gdlm_jid_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%u\n", ls->jid);
+}
+
+static ssize_t gdlm_jid_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+ ls->jid = simple_strtol(buf, NULL, 0);
+ return len;
+}
+
+static ssize_t gdlm_first_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%u\n", ls->first);
+}
+
+static ssize_t gdlm_first_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+ ls->first = simple_strtol(buf, NULL, 0);
+ return len;
+}
+
+static ssize_t gdlm_first_done_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->first_done);
+}
+
+static ssize_t gdlm_recover_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%u\n", ls->recover_jid);
+}
+
+static ssize_t gdlm_recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+ ls->recover_jid = simple_strtol(buf, NULL, 0);
+ ls->fscb(ls->fsdata, LM_CB_NEED_RECOVERY, &ls->recover_jid);
+ return len;
+}
+
+static ssize_t gdlm_recover_done_show(struct gdlm_ls *ls, char *buf)
+{
+ ssize_t ret;
+ ret = sprintf(buf, "%d\n", ls->recover_done);
+ return ret;
+}
+
+static ssize_t gdlm_cluster_show(struct gdlm_ls *ls, char *buf)
+{
+ ssize_t ret;
+ ret = sprintf(buf, "%s\n", ls->clustername);
+ return ret;
+}
+
+static ssize_t gdlm_options_show(struct gdlm_ls *ls, char *buf)
+{
+ ssize_t ret = 0;
+
+ if (ls->fsflags & LM_MFLAG_SPECTATOR)
+ ret += sprintf(buf, "spectator ");
+
+ return ret;
+}
+
+struct gdlm_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gdlm_ls *, char *);
+ ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
+};
+
+static struct gdlm_attr gdlm_attr_block = {
+ .attr = {.name = "block", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_block_show,
+ .store = gdlm_block_store
+};
+
+static struct gdlm_attr gdlm_attr_mounted = {
+ .attr = {.name = "mounted", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_mounted_show,
+ .store = gdlm_mounted_store
+};
+
+static struct gdlm_attr gdlm_attr_withdraw = {
+ .attr = {.name = "withdraw", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_withdraw_show,
+ .store = gdlm_withdraw_store
+};
+
+static struct gdlm_attr gdlm_attr_jid = {
+ .attr = {.name = "jid", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_jid_show,
+ .store = gdlm_jid_store
+};
+
+static struct gdlm_attr gdlm_attr_first = {
+ .attr = {.name = "first", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_first_show,
+ .store = gdlm_first_store
+};
+
+static struct gdlm_attr gdlm_attr_first_done = {
+ .attr = {.name = "first_done", .mode = S_IRUGO},
+ .show = gdlm_first_done_show,
+};
+
+static struct gdlm_attr gdlm_attr_recover = {
+ .attr = {.name = "recover", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_recover_show,
+ .store = gdlm_recover_store
+};
+
+static struct gdlm_attr gdlm_attr_recover_done = {
+ .attr = {.name = "recover_done", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_recover_done_show,
+};
+
+static struct gdlm_attr gdlm_attr_cluster = {
+ .attr = {.name = "cluster", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_cluster_show,
+};
+
+static struct gdlm_attr gdlm_attr_options = {
+ .attr = {.name = "options", .mode = S_IRUGO | S_IWUSR},
+ .show = gdlm_options_show,
+};
+
+static struct attribute *gdlm_attrs[] = {
+ &gdlm_attr_block.attr,
+ &gdlm_attr_mounted.attr,
+ &gdlm_attr_withdraw.attr,
+ &gdlm_attr_jid.attr,
+ &gdlm_attr_first.attr,
+ &gdlm_attr_first_done.attr,
+ &gdlm_attr_recover.attr,
+ &gdlm_attr_recover_done.attr,
+ &gdlm_attr_cluster.attr,
+ &gdlm_attr_options.attr,
+ NULL,
+};
+
+static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
+ struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
+ return a->show ? a->show(ls, buf) : 0;
+}
+
+static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
+ struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
+ return a->store ? a->store(ls, buf, len) : len;
+}
+
+static struct sysfs_ops gdlm_attr_ops = {
+ .show = gdlm_attr_show,
+ .store = gdlm_attr_store,
+};
+
+static struct kobj_type gdlm_ktype = {
+ .default_attrs = gdlm_attrs,
+ .sysfs_ops = &gdlm_attr_ops,
+};
+
+static struct kset gdlm_kset = {
+ .subsys = &kernel_subsys,
+ .kobj = {.name = "lock_dlm",},
+ .ktype = &gdlm_ktype,
+};
+
+int gdlm_kobject_setup(struct gdlm_ls *ls)
+{
+ int error;
+
+ error = kobject_set_name(&ls->kobj, "%s", ls->fsname);
+ if (error)
+ return error;
+
+ ls->kobj.kset = &gdlm_kset;
+ ls->kobj.ktype = &gdlm_ktype;
+
+ error = kobject_register(&ls->kobj);
+
+ return 0;
+}
+
+void gdlm_kobject_release(struct gdlm_ls *ls)
+{
+ kobject_unregister(&ls->kobj);
+}
+
+int gdlm_sysfs_init(void)
+{
+ int error;
+
+ error = kset_register(&gdlm_kset);
+ if (error)
+ printk("lock_dlm: cannot register kset %d\n", error);
+
+ return error;
+}
+
+void gdlm_sysfs_exit(void)
+{
+ kset_unregister(&gdlm_kset);
+}
+
diff --git a/fs/gfs2/locking/dlm/thread.c b/fs/gfs2/locking/dlm/thread.c
new file mode 100644
index 0000000..22bbe6d
--- /dev/null
+++ b/fs/gfs2/locking/dlm/thread.c
@@ -0,0 +1,359 @@
+/******************************************************************************
+*******************************************************************************
+**
+** 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"
+
+/* A lock placed on this queue is re-submitted to DLM as soon as the lock_dlm
+ thread gets to it. */
+
+static void queue_submit(struct gdlm_lock *lp)
+{
+ struct gdlm_ls *ls = lp->ls;
+
+ spin_lock(&ls->async_lock);
+ list_add_tail(&lp->delay_list, &ls->submit);
+ spin_unlock(&ls->async_lock);
+ wake_up(&ls->thread_wait);
+}
+
+static void process_submit(struct gdlm_lock *lp)
+{
+ gdlm_do_lock(lp, NULL);
+}
+
+static void process_blocking(struct gdlm_lock *lp, int bast_mode)
+{
+ struct gdlm_ls *ls = lp->ls;
+ unsigned int cb;
+
+ switch (gdlm_make_lmstate(bast_mode)) {
+ case LM_ST_EXCLUSIVE:
+ cb = LM_CB_NEED_E;
+ break;
+ case LM_ST_DEFERRED:
+ cb = LM_CB_NEED_D;
+ break;
+ case LM_ST_SHARED:
+ cb = LM_CB_NEED_S;
+ break;
+ default:
+ GDLM_ASSERT(0, printk("unknown bast mode %u\n",lp->bast_mode););
+ }
+
+ ls->fscb(ls->fsdata, cb, &lp->lockname);
+}
+
+static void process_complete(struct gdlm_lock *lp)
+{
+ struct gdlm_ls *ls = lp->ls;
+ struct lm_async_cb acb;
+ int16_t prev_mode = lp->cur;
+
+ memset(&acb, 0, sizeof(acb));
+
+ if (lp->lksb.sb_status == -DLM_ECANCEL) {
+ log_all("complete dlm cancel %x,%"PRIx64" flags %lx",
+ lp->lockname.ln_type, lp->lockname.ln_number,
+ lp->flags);
+
+ lp->req = lp->cur;
+ acb.lc_ret |= LM_OUT_CANCELED;
+ if (lp->cur == DLM_LOCK_IV)
+ lp->lksb.sb_lkid = 0;
+ goto out;
+ }
+
+ if (test_and_clear_bit(LFL_DLM_UNLOCK, &lp->flags)) {
+ if (lp->lksb.sb_status != -DLM_EUNLOCK) {
+ log_all("unlock sb_status %d %x,%"PRIx64" flags %lx",
+ lp->lksb.sb_status, lp->lockname.ln_type,
+ lp->lockname.ln_number, lp->flags);
+ return;
+ }
+
+ lp->cur = DLM_LOCK_IV;
+ lp->req = DLM_LOCK_IV;
+ lp->lksb.sb_lkid = 0;
+
+ if (test_and_clear_bit(LFL_UNLOCK_DELETE, &lp->flags)) {
+ gdlm_delete_lp(lp);
+ return;
+ }
+ goto out;
+ }
+
+ if (lp->lksb.sb_flags & DLM_SBF_VALNOTVALID)
+ memset(lp->lksb.sb_lvbptr, 0, GDLM_LVB_SIZE);
+
+ if (lp->lksb.sb_flags & DLM_SBF_ALTMODE) {
+ if (lp->req == DLM_LOCK_PR)
+ lp->req = DLM_LOCK_CW;
+ else if (lp->req == DLM_LOCK_CW)
+ lp->req = DLM_LOCK_PR;
+ }
+
+ /*
+ * A canceled lock request. The lock was just taken off the delayed
+ * list and was never even submitted to dlm.
+ */
+
+ if (test_and_clear_bit(LFL_CANCEL, &lp->flags)) {
+ log_all("complete internal cancel %x,%"PRIx64"",
+ lp->lockname.ln_type, lp->lockname.ln_number);
+ lp->req = lp->cur;
+ acb.lc_ret |= LM_OUT_CANCELED;
+ goto out;
+ }
+
+ /*
+ * An error occured.
+ */
+
+ if (lp->lksb.sb_status) {
+ /* a "normal" error */
+ if ((lp->lksb.sb_status == -EAGAIN) &&
+ (lp->lkf & DLM_LKF_NOQUEUE)) {
+ lp->req = lp->cur;
+ if (lp->cur == DLM_LOCK_IV)
+ lp->lksb.sb_lkid = 0;
+ goto out;
+ }
+
+ /* this could only happen with cancels I think */
+ log_all("ast sb_status %d %x,%"PRIx64" flags %lx",
+ lp->lksb.sb_status, lp->lockname.ln_type,
+ lp->lockname.ln_number, lp->flags);
+ return;
+ }
+
+ /*
+ * This is an AST for an EX->EX conversion for sync_lvb from GFS.
+ */
+
+ if (test_and_clear_bit(LFL_SYNC_LVB, &lp->flags)) {
+ complete(&lp->ast_wait);
+ return;
+ }
+
+ /*
+ * A lock has been demoted to NL because it initially completed during
+ * BLOCK_LOCKS. Now it must be requested in the originally requested
+ * mode.
+ */
+
+ if (test_and_clear_bit(LFL_REREQUEST, &lp->flags)) {
+ GDLM_ASSERT(lp->req == DLM_LOCK_NL,);
+ GDLM_ASSERT(lp->prev_req > DLM_LOCK_NL,);
+
+ lp->cur = DLM_LOCK_NL;
+ lp->req = lp->prev_req;
+ lp->prev_req = DLM_LOCK_IV;
+ lp->lkf &= ~DLM_LKF_CONVDEADLK;
+
+ set_bit(LFL_NOCACHE, &lp->flags);
+
+ if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
+ !test_bit(LFL_NOBLOCK, &lp->flags))
+ gdlm_queue_delayed(lp);
+ else
+ queue_submit(lp);
+ return;
+ }
+
+ /*
+ * A request is granted during dlm recovery. It may be granted
+ * because the locks of a failed node were cleared. In that case,
+ * there may be inconsistent data beneath this lock and we must wait
+ * for recovery to complete to use it. When gfs recovery is done this
+ * granted lock will be converted to NL and then reacquired in this
+ * granted state.
+ */
+
+ if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) &&
+ !test_bit(LFL_NOBLOCK, &lp->flags) &&
+ lp->req != DLM_LOCK_NL) {
+
+ lp->cur = lp->req;
+ lp->prev_req = lp->req;
+ lp->req = DLM_LOCK_NL;
+ lp->lkf |= DLM_LKF_CONVERT;
+ lp->lkf &= ~DLM_LKF_CONVDEADLK;
+
+ log_debug("rereq %x,%"PRIx64" id %x %d,%d",
+ lp->lockname.ln_type, lp->lockname.ln_number,
+ lp->lksb.sb_lkid, lp->cur, lp->req);
+
+ set_bit(LFL_REREQUEST, &lp->flags);
+ queue_submit(lp);
+ return;
+ }
+
+ /*
+ * DLM demoted the lock to NL before it was granted so GFS must be
+ * told it cannot cache data for this lock.
+ */
+
+ if (lp->lksb.sb_flags & DLM_SBF_DEMOTED)
+ set_bit(LFL_NOCACHE, &lp->flags);
+
+ out:
+ /*
+ * This is an internal lock_dlm lock
+ */
+
+ if (test_bit(LFL_INLOCK, &lp->flags)) {
+ clear_bit(LFL_NOBLOCK, &lp->flags);
+ lp->cur = lp->req;
+ complete(&lp->ast_wait);
+ return;
+ }
+
+ /*
+ * Normal completion of a lock request. Tell GFS it now has the lock.
+ */
+
+ clear_bit(LFL_NOBLOCK, &lp->flags);
+ lp->cur = lp->req;
+
+ acb.lc_name = lp->lockname;
+ acb.lc_ret |= gdlm_make_lmstate(lp->cur);
+
+ if (!test_and_clear_bit(LFL_NOCACHE, &lp->flags) &&
+ (lp->cur > DLM_LOCK_NL) && (prev_mode > DLM_LOCK_NL))
+ acb.lc_ret |= LM_OUT_CACHEABLE;
+
+ ls->fscb(ls->fsdata, LM_CB_ASYNC, &acb);
+}
+
+static inline int no_work(struct gdlm_ls *ls, int blocking)
+{
+ int ret;
+
+ spin_lock(&ls->async_lock);
+ ret = list_empty(&ls->complete) && list_empty(&ls->submit);
+ if (ret && blocking)
+ ret = list_empty(&ls->blocking);
+ spin_unlock(&ls->async_lock);
+
+ return ret;
+}
+
+static inline int check_drop(struct gdlm_ls *ls)
+{
+ if (!ls->drop_locks_count)
+ return 0;
+
+ if (time_after(jiffies, ls->drop_time + ls->drop_locks_period * HZ)) {
+ ls->drop_time = jiffies;
+ if (ls->all_locks_count >= ls->drop_locks_count)
+ return 1;
+ }
+ return 0;
+}
+
+static int gdlm_thread(void *data)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) data;
+ struct gdlm_lock *lp = NULL;
+ int blist = 0;
+ uint8_t complete, blocking, submit, drop;
+ DECLARE_WAITQUEUE(wait, current);
+
+ /* Only thread1 is allowed to do blocking callbacks since gfs
+ may wait for a completion callback within a blocking cb. */
+
+ if (current == ls->thread1)
+ blist = 1;
+
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&ls->thread_wait, &wait);
+ if (no_work(ls, blist))
+ schedule();
+ remove_wait_queue(&ls->thread_wait, &wait);
+ set_current_state(TASK_RUNNING);
+
+ complete = blocking = submit = drop = 0;
+
+ spin_lock(&ls->async_lock);
+
+ if (blist && !list_empty(&ls->blocking)) {
+ lp = list_entry(ls->blocking.next, struct gdlm_lock,
+ blist);
+ list_del_init(&lp->blist);
+ blocking = lp->bast_mode;
+ lp->bast_mode = 0;
+ } else if (!list_empty(&ls->complete)) {
+ lp = list_entry(ls->complete.next, struct gdlm_lock,
+ clist);
+ list_del_init(&lp->clist);
+ complete = 1;
+ } else if (!list_empty(&ls->submit)) {
+ lp = list_entry(ls->submit.next, struct gdlm_lock,
+ delay_list);
+ list_del_init(&lp->delay_list);
+ submit = 1;
+ }
+
+ drop = check_drop(ls);
+ spin_unlock(&ls->async_lock);
+
+ if (complete)
+ process_complete(lp);
+
+ else if (blocking)
+ process_blocking(lp, blocking);
+
+ else if (submit)
+ process_submit(lp);
+
+ if (drop)
+ ls->fscb(ls->fsdata, LM_CB_DROPLOCKS, NULL);
+
+ schedule();
+ }
+
+ return 0;
+}
+
+int gdlm_init_threads(struct gdlm_ls *ls)
+{
+ struct task_struct *p;
+ int error;
+
+ p = kthread_run(gdlm_thread, ls, "lock_dlm1");
+ error = IS_ERR(p);
+ if (error) {
+ log_all("can't start lock_dlm1 thread %d", error);
+ return error;
+ }
+ ls->thread1 = p;
+
+ p = kthread_run(gdlm_thread, ls, "lock_dlm2");
+ error = IS_ERR(p);
+ if (error) {
+ log_all("can't start lock_dlm2 thread %d", error);
+ kthread_stop(ls->thread1);
+ return error;
+ }
+ ls->thread2 = p;
+
+ return 0;
+}
+
+void gdlm_release_threads(struct gdlm_ls *ls)
+{
+ kthread_stop(ls->thread1);
+ kthread_stop(ls->thread2);
+}
+
diff --git a/fs/gfs2/locking/nolock/Makefile b/fs/gfs2/locking/nolock/Makefile
new file mode 100644
index 0000000..cdadf95
--- /dev/null
+++ b/fs/gfs2/locking/nolock/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_GFS2_FS) += lock_nolock.o
+lock_nolock-y := main.o
+
diff --git a/fs/gfs2/locking/nolock/lock_nolock.mod.c b/fs/gfs2/locking/nolock/lock_nolock.mod.c
new file mode 100644
index 0000000..ae92522
--- /dev/null
+++ b/fs/gfs2/locking/nolock/lock_nolock.mod.c
@@ -0,0 +1,44 @@
+#include <linux/module.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+
+#undef unix
+struct module __this_module
+__attribute__((section(".gnu.linkonce.this_module"))) = {
+ .name = __stringify(KBUILD_MODNAME),
+ .init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+ .exit = cleanup_module,
+#endif
+};
+
+static const struct modversion_info ____versions[]
+__attribute_used__
+__attribute__((section("__versions"))) = {
+ { 0x316962fc, "struct_module" },
+ { 0x5a34a45c, "__kmalloc" },
+ { 0x724beef2, "malloc_sizes" },
+ { 0x3fa03a97, "memset" },
+ { 0xc16fe12d, "__memcpy" },
+ { 0xdd132261, "printk" },
+ { 0x859204af, "sscanf" },
+ { 0x3656bf5a, "lock_kernel" },
+ { 0x1e6d26a8, "strstr" },
+ { 0x41ede9df, "lm_register_proto" },
+ { 0xb1f975aa, "unlock_kernel" },
+ { 0x87b0b01f, "posix_lock_file_wait" },
+ { 0x75f29cfd, "kmem_cache_alloc" },
+ { 0x69384280, "lm_unregister_proto" },
+ { 0x37a0cba, "kfree" },
+ { 0x5d16bfe6, "posix_test_lock" },
+};
+
+static const char __module_depends[]
+__attribute_used__
+__attribute__((section(".modinfo"))) =
+"depends=gfs2";
+
+
+MODULE_INFO(srcversion, "123E446F965A386A0C017C4");
diff --git a/fs/gfs2/locking/nolock/main.c b/fs/gfs2/locking/nolock/main.c
new file mode 100644
index 0000000..d3919e4
--- /dev/null
+++ b/fs/gfs2/locking/nolock/main.c
@@ -0,0 +1,357 @@
+/******************************************************************************
+*******************************************************************************
+**
+** 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 <linux/module.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+
+#include "../../lm_interface.h"
+
+struct nolock_lockspace {
+ unsigned int nl_lvb_size;
+};
+
+struct lm_lockops nolock_ops;
+
+/**
+ * nolock_mount - mount a nolock lockspace
+ * @table_name: the name of the space to mount
+ * @host_data: host specific data
+ * @cb: the callback
+ * @fsdata:
+ * @min_lvb_size:
+ * @flags:
+ * @lockstruct: the structure of crap to fill in
+ *
+ * Returns: 0 on success, -EXXX on failure
+ */
+
+static int nolock_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)
+{
+ char *c;
+ unsigned int jid;
+ struct nolock_lockspace *nl;
+
+ /* If there is a "jid=" in the hostdata, return that jid.
+ Otherwise, return zero. */
+
+ c = strstr(host_data, "jid=");
+ if (!c)
+ jid = 0;
+ else {
+ c += 4;
+ sscanf(c, "%u", &jid);
+ }
+
+ nl = kmalloc(sizeof(struct nolock_lockspace), GFP_KERNEL);
+ if (!nl)
+ return -ENOMEM;
+
+ memset(nl, 0, sizeof(struct nolock_lockspace));
+ nl->nl_lvb_size = min_lvb_size;
+
+ lockstruct->ls_jid = jid;
+ lockstruct->ls_first = 1;
+ lockstruct->ls_lvb_size = min_lvb_size;
+ lockstruct->ls_lockspace = (lm_lockspace_t *)nl;
+ lockstruct->ls_ops = &nolock_ops;
+ lockstruct->ls_flags = LM_LSFLAG_LOCAL;
+
+ return 0;
+}
+
+/**
+ * nolock_others_may_mount - unmount a lock space
+ * @lockspace: the lockspace to unmount
+ *
+ */
+
+static void nolock_others_may_mount(lm_lockspace_t *lockspace)
+{
+}
+
+/**
+ * nolock_unmount - unmount a lock space
+ * @lockspace: the lockspace to unmount
+ *
+ */
+
+static void nolock_unmount(lm_lockspace_t *lockspace)
+{
+ struct nolock_lockspace *nl = (struct nolock_lockspace *)lockspace;
+ kfree(nl);
+}
+
+/**
+ * nolock_withdraw - withdraw from a lock space
+ * @lockspace: the lockspace
+ *
+ */
+
+static void nolock_withdraw(lm_lockspace_t *lockspace)
+{
+}
+
+/**
+ * nolock_get_lock - get a lm_lock_t given a descripton of the lock
+ * @lockspace: the lockspace the lock lives in
+ * @name: the name of the lock
+ * @lockp: return the lm_lock_t here
+ *
+ * Returns: 0 on success, -EXXX on failure
+ */
+
+static int nolock_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ lm_lock_t **lockp)
+{
+ *lockp = (lm_lock_t *)lockspace;
+ return 0;
+}
+
+/**
+ * nolock_put_lock - get rid of a lock structure
+ * @lock: the lock to throw away
+ *
+ */
+
+static void nolock_put_lock(lm_lock_t *lock)
+{
+}
+
+/**
+ * nolock_lock - acquire a lock
+ * @lock: the lock to manipulate
+ * @cur_state: the current state
+ * @req_state: the requested state
+ * @flags: modifier flags
+ *
+ * Returns: A bitmap of LM_OUT_*
+ */
+
+static unsigned int nolock_lock(lm_lock_t *lock, unsigned int cur_state,
+ unsigned int req_state, unsigned int flags)
+{
+ return req_state | LM_OUT_CACHEABLE;
+}
+
+/**
+ * nolock_unlock - unlock a lock
+ * @lock: the lock to manipulate
+ * @cur_state: the current state
+ *
+ * Returns: 0
+ */
+
+static unsigned int nolock_unlock(lm_lock_t *lock, unsigned int cur_state)
+{
+ return 0;
+}
+
+/**
+ * nolock_cancel - cancel a request on a lock
+ * @lock: the lock to cancel request for
+ *
+ */
+
+static void nolock_cancel(lm_lock_t *lock)
+{
+}
+
+/**
+ * nolock_hold_lvb - hold on to a lock value block
+ * @lock: the lock the LVB is associated with
+ * @lvbp: return the lm_lvb_t here
+ *
+ * Returns: 0 on success, -EXXX on failure
+ */
+
+static int nolock_hold_lvb(lm_lock_t *lock, char **lvbp)
+{
+ struct nolock_lockspace *nl = (struct nolock_lockspace *)lock;
+ int error = 0;
+
+ *lvbp = kmalloc(nl->nl_lvb_size, GFP_KERNEL);
+ if (*lvbp)
+ memset(*lvbp, 0, nl->nl_lvb_size);
+ else
+ error = -ENOMEM;
+
+ return error;
+}
+
+/**
+ * nolock_unhold_lvb - release a LVB
+ * @lock: the lock the LVB is associated with
+ * @lvb: the lock value block
+ *
+ */
+
+static void nolock_unhold_lvb(lm_lock_t *lock, char *lvb)
+{
+ kfree(lvb);
+}
+
+/**
+ * nolock_sync_lvb - sync out the value of a lvb
+ * @lock: the lock the LVB is associated with
+ * @lvb: the lock value block
+ *
+ */
+
+static void nolock_sync_lvb(lm_lock_t *lock, char *lvb)
+{
+}
+
+/**
+ * nolock_plock_get -
+ * @lockspace: the lockspace
+ * @name:
+ * @file:
+ * @fl:
+ *
+ * Returns: errno
+ */
+
+static int nolock_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, struct file_lock *fl)
+{
+ struct file_lock *tmp;
+
+ lock_kernel();
+ tmp = posix_test_lock(file, fl);
+ fl->fl_type = F_UNLCK;
+ if (tmp)
+ memcpy(fl, tmp, sizeof(struct file_lock));
+ unlock_kernel();
+
+ return 0;
+}
+
+/**
+ * nolock_plock -
+ * @lockspace: the lockspace
+ * @name:
+ * @file:
+ * @cmd:
+ * @fl:
+ *
+ * Returns: errno
+ */
+
+static int nolock_plock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, int cmd, struct file_lock *fl)
+{
+ int error;
+ lock_kernel();
+ error = posix_lock_file_wait(file, fl);
+ unlock_kernel();
+ return error;
+}
+
+/**
+ * nolock_punlock -
+ * @lockspace: the lockspace
+ * @name:
+ * @file:
+ * @fl:
+ *
+ * Returns: errno
+ */
+
+static int nolock_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, struct file_lock *fl)
+{
+ int error;
+ lock_kernel();
+ error = posix_lock_file_wait(file, fl);
+ unlock_kernel();
+ return error;
+}
+
+/**
+ * nolock_recovery_done - reset the expired locks for a given jid
+ * @lockspace: the lockspace
+ * @jid: the jid
+ *
+ */
+
+static void nolock_recovery_done(lm_lockspace_t *lockspace, unsigned int jid,
+ unsigned int message)
+{
+}
+
+struct lm_lockops nolock_ops = {
+ .lm_proto_name = "lock_nolock",
+ .lm_mount = nolock_mount,
+ .lm_others_may_mount = nolock_others_may_mount,
+ .lm_unmount = nolock_unmount,
+ .lm_withdraw = nolock_withdraw,
+ .lm_get_lock = nolock_get_lock,
+ .lm_put_lock = nolock_put_lock,
+ .lm_lock = nolock_lock,
+ .lm_unlock = nolock_unlock,
+ .lm_cancel = nolock_cancel,
+ .lm_hold_lvb = nolock_hold_lvb,
+ .lm_unhold_lvb = nolock_unhold_lvb,
+ .lm_sync_lvb = nolock_sync_lvb,
+ .lm_plock_get = nolock_plock_get,
+ .lm_plock = nolock_plock,
+ .lm_punlock = nolock_punlock,
+ .lm_recovery_done = nolock_recovery_done,
+ .lm_owner = THIS_MODULE,
+};
+
+/**
+ * init_nolock - Initialize the nolock module
+ *
+ * Returns: 0 on success, -EXXX on failure
+ */
+
+int __init init_nolock(void)
+{
+ int error;
+
+ error = lm_register_proto(&nolock_ops);
+ if (error) {
+ printk("lock_nolock: can't register protocol: %d\n", error);
+ return error;
+ }
+
+ printk("Lock_Nolock (built %s %s) installed\n", __DATE__, __TIME__);
+ return 0;
+}
+
+/**
+ * exit_nolock - cleanup the nolock module
+ *
+ */
+
+void __exit exit_nolock(void)
+{
+ lm_unregister_proto(&nolock_ops);
+}
+
+module_init(init_nolock);
+module_exit(exit_nolock);
+
+MODULE_DESCRIPTION("GFS Nolock Locking Module");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+