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Message-Id: <1157031710.3384.811.camel@quoit.chygwyn.com>
Date: Thu, 31 Aug 2006 14:41:50 +0100
From: Steven Whitehouse <swhiteho@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Russell Cattelan <cattelan@...hat.com>,
David Teigland <teigland@...hat.com>,
Ingo Molnar <mingo@...e.hu>, hch@...radead.org
Subject: [PATCH 14/16] GFS2: The DLM interface module
[PATCH 14/16] GFS2: The DLM interface module
The interface between GFS2 and the DLM. This is the bit which is actually
part of GFS2.
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: David Teigland <teigland@...hat.com>
fs/gfs2/locking/dlm/Makefile | 3
fs/gfs2/locking/dlm/lock.c | 541 +++++++++++++++++++++++++++++++++++++++++
fs/gfs2/locking/dlm/lock_dlm.h | 188 ++++++++++++++
fs/gfs2/locking/dlm/main.c | 64 ++++
fs/gfs2/locking/dlm/mount.c | 256 +++++++++++++++++++
fs/gfs2/locking/dlm/plock.c | 302 ++++++++++++++++++++++
fs/gfs2/locking/dlm/sysfs.c | 225 +++++++++++++++++
fs/gfs2/locking/dlm/thread.c | 359 +++++++++++++++++++++++++++
include/linux/lock_dlm_plock.h | 41 +++
9 files changed, 1979 insertions(+)
--- /dev/null
+++ b/fs/gfs2/locking/dlm/main.c
@@ -0,0 +1,64 @@
+/*
+ * 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;
+
+static int __init init_lock_dlm(void)
+{
+ int error;
+
+ error = gfs2_register_lockproto(&gdlm_ops);
+ if (error) {
+ printk(KERN_WARNING "lock_dlm: can't register protocol: %d\n",
+ error);
+ return error;
+ }
+
+ error = gdlm_sysfs_init();
+ if (error) {
+ gfs2_unregister_lockproto(&gdlm_ops);
+ return error;
+ }
+
+ error = gdlm_plock_init();
+ if (error) {
+ gdlm_sysfs_exit();
+ gfs2_unregister_lockproto(&gdlm_ops);
+ return error;
+ }
+
+ gdlm_drop_count = GDLM_DROP_COUNT;
+ gdlm_drop_period = GDLM_DROP_PERIOD;
+
+ printk(KERN_INFO
+ "Lock_DLM (built %s %s) installed\n", __DATE__, __TIME__);
+ return 0;
+}
+
+static void __exit exit_lock_dlm(void)
+{
+ gdlm_plock_exit();
+ gdlm_sysfs_exit();
+ gfs2_unregister_lockproto(&gdlm_ops);
+}
+
+module_init(init_lock_dlm);
+module_exit(exit_lock_dlm);
+
+MODULE_DESCRIPTION("GFS DLM Locking Module");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
--- /dev/null
+++ b/fs/gfs2/locking/dlm/lock.c
@@ -0,0 +1,541 @@
+/*
+ * 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(astarg);
+}
+
+static inline void gdlm_bast(void *astarg, int mode)
+{
+ struct gdlm_lock *lp = astarg;
+ struct gdlm_ls *ls = lp->ls;
+
+ if (!mode) {
+ printk(KERN_INFO "lock_dlm: bast mode zero %x,%llx\n",
+ lp->lockname.ln_type,
+ (unsigned long long)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;
+ }
+ gdlm_assert(0, "unknown LM state %d", lmstate);
+ return -1;
+}
+
+/* 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;
+ }
+ gdlm_assert(0, "unknown DLM mode %d", dlmmode);
+ return -1;
+}
+
+/* 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, "%d, %d", 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%16llx", lockname->ln_type,
+ (unsigned long long)lockname->ln_number);
+ str->namelen = GDLM_STRNAME_BYTES;
+}
+
+static int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
+ struct gdlm_lock **lpp)
+{
+ struct gdlm_lock *lp;
+
+ lp = kzalloc(sizeof(struct gdlm_lock), GFP_KERNEL);
+ if (!lp)
+ return -ENOMEM;
+
+ 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), "%x,%llx", lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number);
+ 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);
+}
+
+unsigned int gdlm_do_lock(struct gdlm_lock *lp)
+{
+ 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 LM_OUT_ASYNC;
+ }
+
+ /*
+ * 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,%llx id %x %d,%d %x", lp->lockname.ln_type,
+ (unsigned long long)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, lp,
+ bast ? gdlm_bast : NULL);
+
+ if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) {
+ lp->lksb.sb_status = -EAGAIN;
+ queue_complete(lp);
+ error = 0;
+ }
+
+ if (error) {
+ log_debug("%s: gdlm_lock %x,%llx err=%d cur=%d req=%d lkf=%x "
+ "flags=%lx", ls->fsname, lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number, error,
+ lp->cur, lp->req, lp->lkf, lp->flags);
+ return LM_OUT_ERROR;
+ }
+ return LM_OUT_ASYNC;
+}
+
+static unsigned int gdlm_do_unlock(struct gdlm_lock *lp)
+{
+ struct gdlm_ls *ls = lp->ls;
+ 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,%llx %x %d %x", lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number,
+ lp->lksb.sb_lkid, lp->cur, lkf);
+
+ error = dlm_unlock(ls->dlm_lockspace, lp->lksb.sb_lkid, lkf, NULL, lp);
+
+ if (error) {
+ log_debug("%s: gdlm_unlock %x,%llx err=%d cur=%d req=%d lkf=%x "
+ "flags=%lx", ls->fsname, lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number, error,
+ lp->cur, lp->req, lp->lkf, lp->flags);
+ return LM_OUT_ERROR;
+ }
+ return LM_OUT_ASYNC;
+}
+
+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);
+
+ return gdlm_do_lock(lp);
+}
+
+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;
+ return gdlm_do_unlock(lp);
+}
+
+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_info("gdlm_cancel %x,%llx flags %lx", lp->lockname.ln_type,
+ (unsigned long long)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_info("gdlm_cancel skip %x,%llx flags %lx",
+ lp->lockname.ln_type,
+ (unsigned long long)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_info("gdlm_cancel rv %d %x,%llx flags %lx", error,
+ lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number, lp->flags);
+
+ if (error == -EBUSY)
+ clear_bit(LFL_DLM_CANCEL, &lp->flags);
+}
+
+static int gdlm_add_lvb(struct gdlm_lock *lp)
+{
+ char *lvb;
+
+ lvb = kzalloc(GDLM_LVB_SIZE, GFP_KERNEL);
+ if (!lvb)
+ return -ENOMEM;
+
+ lp->lksb.sb_lvbptr = lvb;
+ lp->lvb = lvb;
+ return 0;
+}
+
+static 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(KERN_INFO "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);
+ wait_for_completion(&lpn->ast_wait);
+ error = lpn->lksb.sb_status;
+ if (error) {
+ printk(KERN_INFO "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, "%x,%llx", lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number);
+ 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);
+ 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;
+}
+
--- /dev/null
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -0,0 +1,256 @@
+/*
+ * 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 = kzalloc(sizeof(struct gdlm_ls), GFP_KERNEL);
+ if (!ls)
+ return NULL;
+
+ 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) {
+ log_info("invalid table_name \"%s\"", table_name);
+ kfree(ls);
+ return NULL;
+ }
+ *p = '\0';
+ p++;
+
+ strncpy(ls->clustername, buf, GDLM_NAME_LEN);
+ strncpy(ls->fsname, p, GDLM_NAME_LEN);
+
+ return ls;
+}
+
+static int make_args(struct gdlm_ls *ls, char *data_arg, int *nodir)
+{
+ char data[256];
+ char *options, *x, *y;
+ int error = 0;
+
+ memset(data, 0, 256);
+ strncpy(data, data_arg, 255);
+
+ for (options = data; (x = strsep(&options, ":")); ) {
+ if (!*x)
+ continue;
+
+ y = strchr(x, '=');
+ if (y)
+ *y++ = 0;
+
+ if (!strcmp(x, "jid")) {
+ if (!y) {
+ log_error("need argument to jid");
+ error = -EINVAL;
+ break;
+ }
+ sscanf(y, "%u", &ls->jid);
+
+ } else if (!strcmp(x, "first")) {
+ if (!y) {
+ log_error("need argument to first");
+ error = -EINVAL;
+ break;
+ }
+ sscanf(y, "%u", &ls->first);
+
+ } else if (!strcmp(x, "id")) {
+ if (!y) {
+ log_error("need argument to id");
+ error = -EINVAL;
+ break;
+ }
+ sscanf(y, "%u", &ls->id);
+
+ } else if (!strcmp(x, "nodir")) {
+ if (!y) {
+ log_error("need argument to nodir");
+ error = -EINVAL;
+ break;
+ }
+ sscanf(y, "%u", nodir);
+
+ } else {
+ log_error("unkonwn option: %s", x);
+ error = -EINVAL;
+ break;
+ }
+ }
+
+ return error;
+}
+
+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 kobject *fskobj)
+{
+ struct gdlm_ls *ls;
+ int error = -ENOMEM, nodir = 0;
+
+ if (min_lvb_size > GDLM_LVB_SIZE)
+ goto out;
+
+ ls = init_gdlm(cb, fsdata, flags, table_name);
+ if (!ls)
+ goto out;
+
+ error = make_args(ls, host_data, &nodir);
+ if (error)
+ goto out;
+
+ error = gdlm_init_threads(ls);
+ if (error)
+ goto out_free;
+
+ error = gdlm_kobject_setup(ls, fskobj);
+ if (error)
+ goto out_thread;
+
+ error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
+ &ls->dlm_lockspace,
+ nodir ? DLM_LSFL_NODIR : 0,
+ GDLM_LVB_SIZE);
+ if (error) {
+ log_error("dlm_new_lockspace error %d", error);
+ goto out_kobj;
+ }
+
+ 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_kobj:
+ gdlm_kobject_release(ls);
+ 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);
+
+ /* FIXME: serialize unmount and withdraw in case they
+ happen at once. Also, if unmount follows withdraw,
+ wait for withdraw to finish. */
+
+ if (test_bit(DFL_WITHDRAW, &ls->flags))
+ goto out;
+
+ gdlm_kobject_release(ls);
+ dlm_release_lockspace(ls->dlm_lockspace, 2);
+ gdlm_release_threads(ls);
+ rv = gdlm_release_all_locks(ls);
+ if (rv)
+ log_info("gdlm_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_jid_done = jid;
+ ls->recover_jid_status = message;
+ kobject_uevent(&ls->kobj, KOBJ_CHANGE);
+}
+
+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);
+}
+
+/* Userspace gets the offline uevent, blocks new gfs locks on
+ other mounters, and lets us know (sets WITHDRAW flag). Then,
+ userspace leaves the mount group while we leave the lockspace. */
+
+static void gdlm_withdraw(lm_lockspace_t *lockspace)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+
+ kobject_uevent(&ls->kobj, KOBJ_OFFLINE);
+
+ 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);
+ gdlm_kobject_release(ls);
+}
+
+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,
+};
+
--- /dev/null
+++ b/fs/gfs2/locking/dlm/plock.c
@@ -0,0 +1,302 @@
+/*
+ * 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/miscdevice.h>
+#include <linux/lock_dlm_plock.h>
+
+#include "lock_dlm.h"
+
+
+static spinlock_t ops_lock;
+static struct list_head send_list;
+static struct list_head recv_list;
+static wait_queue_head_t send_wq;
+static wait_queue_head_t recv_wq;
+
+struct plock_op {
+ struct list_head list;
+ int done;
+ struct gdlm_plock_info info;
+};
+
+static inline void set_version(struct gdlm_plock_info *info)
+{
+ info->version[0] = GDLM_PLOCK_VERSION_MAJOR;
+ info->version[1] = GDLM_PLOCK_VERSION_MINOR;
+ info->version[2] = GDLM_PLOCK_VERSION_PATCH;
+}
+
+static int check_version(struct gdlm_plock_info *info)
+{
+ if ((GDLM_PLOCK_VERSION_MAJOR != info->version[0]) ||
+ (GDLM_PLOCK_VERSION_MINOR < info->version[1])) {
+ log_error("plock device version mismatch: "
+ "kernel (%u.%u.%u), user (%u.%u.%u)",
+ GDLM_PLOCK_VERSION_MAJOR,
+ GDLM_PLOCK_VERSION_MINOR,
+ GDLM_PLOCK_VERSION_PATCH,
+ info->version[0],
+ info->version[1],
+ info->version[2]);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void send_op(struct plock_op *op)
+{
+ set_version(&op->info);
+ INIT_LIST_HEAD(&op->list);
+ spin_lock(&ops_lock);
+ list_add_tail(&op->list, &send_list);
+ spin_unlock(&ops_lock);
+ wake_up(&send_wq);
+}
+
+int gdlm_plock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, int cmd, struct file_lock *fl)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+ struct plock_op *op;
+ int rv;
+
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ op->info.optype = GDLM_PLOCK_OP_LOCK;
+ op->info.pid = fl->fl_pid;
+ op->info.ex = (fl->fl_type == F_WRLCK);
+ op->info.wait = IS_SETLKW(cmd);
+ op->info.fsid = ls->id;
+ op->info.number = name->ln_number;
+ op->info.start = fl->fl_start;
+ op->info.end = fl->fl_end;
+ op->info.owner = (__u64)(long) fl->fl_owner;
+
+ send_op(op);
+ wait_event(recv_wq, (op->done != 0));
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ printk(KERN_INFO "plock op on list\n");
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ rv = op->info.rv;
+
+ if (!rv) {
+ if (posix_lock_file_wait(file, fl) < 0)
+ log_error("gdlm_plock: vfs lock error %x,%llx",
+ name->ln_type,
+ (unsigned long long)name->ln_number);
+ }
+
+ kfree(op);
+ return rv;
+}
+
+int gdlm_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, struct file_lock *fl)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+ struct plock_op *op;
+ int rv;
+
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ if (posix_lock_file_wait(file, fl) < 0)
+ log_error("gdlm_punlock: vfs unlock error %x,%llx",
+ name->ln_type, (unsigned long long)name->ln_number);
+
+ op->info.optype = GDLM_PLOCK_OP_UNLOCK;
+ op->info.pid = fl->fl_pid;
+ op->info.fsid = ls->id;
+ op->info.number = name->ln_number;
+ op->info.start = fl->fl_start;
+ op->info.end = fl->fl_end;
+ op->info.owner = (__u64)(long) fl->fl_owner;
+
+ send_op(op);
+ wait_event(recv_wq, (op->done != 0));
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ printk(KERN_INFO "punlock op on list\n");
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ rv = op->info.rv;
+
+ kfree(op);
+ return rv;
+}
+
+int gdlm_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name,
+ struct file *file, struct file_lock *fl)
+{
+ struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
+ struct plock_op *op;
+ int rv;
+
+ op = kzalloc(sizeof(*op), GFP_KERNEL);
+ if (!op)
+ return -ENOMEM;
+
+ op->info.optype = GDLM_PLOCK_OP_GET;
+ op->info.pid = fl->fl_pid;
+ op->info.ex = (fl->fl_type == F_WRLCK);
+ op->info.fsid = ls->id;
+ op->info.number = name->ln_number;
+ op->info.start = fl->fl_start;
+ op->info.end = fl->fl_end;
+
+ send_op(op);
+ wait_event(recv_wq, (op->done != 0));
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&op->list)) {
+ printk(KERN_INFO "plock_get op on list\n");
+ list_del(&op->list);
+ }
+ spin_unlock(&ops_lock);
+
+ rv = op->info.rv;
+
+ if (rv == 0)
+ fl->fl_type = F_UNLCK;
+ else if (rv > 0) {
+ fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
+ fl->fl_pid = op->info.pid;
+ fl->fl_start = op->info.start;
+ fl->fl_end = op->info.end;
+ }
+
+ kfree(op);
+ return rv;
+}
+
+/* a read copies out one plock request from the send list */
+static ssize_t dev_read(struct file *file, char __user *u, size_t count,
+ loff_t *ppos)
+{
+ struct gdlm_plock_info info;
+ struct plock_op *op = NULL;
+
+ if (count < sizeof(info))
+ return -EINVAL;
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&send_list)) {
+ op = list_entry(send_list.next, struct plock_op, list);
+ list_move(&op->list, &recv_list);
+ memcpy(&info, &op->info, sizeof(info));
+ }
+ spin_unlock(&ops_lock);
+
+ if (!op)
+ return -EAGAIN;
+
+ if (copy_to_user(u, &info, sizeof(info)))
+ return -EFAULT;
+ return sizeof(info);
+}
+
+/* a write copies in one plock result that should match a plock_op
+ on the recv list */
+static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
+ loff_t *ppos)
+{
+ struct gdlm_plock_info info;
+ struct plock_op *op;
+ int found = 0;
+
+ if (count != sizeof(info))
+ return -EINVAL;
+
+ if (copy_from_user(&info, u, sizeof(info)))
+ return -EFAULT;
+
+ if (check_version(&info))
+ return -EINVAL;
+
+ spin_lock(&ops_lock);
+ list_for_each_entry(op, &recv_list, list) {
+ if (op->info.fsid == info.fsid &&
+ op->info.number == info.number &&
+ op->info.owner == info.owner) {
+ list_del_init(&op->list);
+ found = 1;
+ op->done = 1;
+ memcpy(&op->info, &info, sizeof(info));
+ break;
+ }
+ }
+ spin_unlock(&ops_lock);
+
+ if (found)
+ wake_up(&recv_wq);
+ else
+ printk(KERN_INFO "gdlm dev_write no op %x %llx\n", info.fsid,
+ (unsigned long long)info.number);
+ return count;
+}
+
+static unsigned int dev_poll(struct file *file, poll_table *wait)
+{
+ poll_wait(file, &send_wq, wait);
+
+ spin_lock(&ops_lock);
+ if (!list_empty(&send_list)) {
+ spin_unlock(&ops_lock);
+ return POLLIN | POLLRDNORM;
+ }
+ spin_unlock(&ops_lock);
+ return 0;
+}
+
+static struct file_operations dev_fops = {
+ .read = dev_read,
+ .write = dev_write,
+ .poll = dev_poll,
+ .owner = THIS_MODULE
+};
+
+static struct miscdevice plock_dev_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = GDLM_PLOCK_MISC_NAME,
+ .fops = &dev_fops
+};
+
+int gdlm_plock_init(void)
+{
+ int rv;
+
+ spin_lock_init(&ops_lock);
+ INIT_LIST_HEAD(&send_list);
+ INIT_LIST_HEAD(&recv_list);
+ init_waitqueue_head(&send_wq);
+ init_waitqueue_head(&recv_wq);
+
+ rv = misc_register(&plock_dev_misc);
+ if (rv)
+ printk(KERN_INFO "gdlm_plock_init: misc_register failed %d",
+ rv);
+ return rv;
+}
+
+void gdlm_plock_exit(void)
+{
+ if (misc_deregister(&plock_dev_misc) < 0)
+ printk(KERN_INFO "gdlm_plock_exit: misc_deregister failed");
+}
+
--- /dev/null
+++ b/fs/gfs2/locking/dlm/sysfs.c
@@ -0,0 +1,225 @@
+/*
+ * 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/ctype.h>
+#include <linux/stat.h>
+
+#include "lock_dlm.h"
+
+extern struct lm_lockops gdlm_ops;
+
+static ssize_t proto_name_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%s\n", gdlm_ops.lm_proto_name);
+}
+
+static ssize_t 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 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 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 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 id_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%u\n", ls->id);
+}
+
+static ssize_t jid_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->jid);
+}
+
+static ssize_t first_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->first);
+}
+
+static ssize_t first_done_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->first_done);
+}
+
+static ssize_t recover_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->recover_jid);
+}
+
+static ssize_t 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 recover_done_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->recover_jid_done);
+}
+
+static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
+{
+ return sprintf(buf, "%d\n", ls->recover_jid_status);
+}
+
+struct gdlm_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct gdlm_ls *, char *);
+ ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
+};
+
+#define GDLM_ATTR(_name,_mode,_show,_store) \
+static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
+
+GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
+GDLM_ATTR(block, 0644, block_show, block_store);
+GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
+GDLM_ATTR(id, 0444, id_show, NULL);
+GDLM_ATTR(jid, 0444, jid_show, NULL);
+GDLM_ATTR(first, 0444, first_show, NULL);
+GDLM_ATTR(first_done, 0444, first_done_show, NULL);
+GDLM_ATTR(recover, 0644, recover_show, recover_store);
+GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
+GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
+
+static struct attribute *gdlm_attrs[] = {
+ &gdlm_attr_proto_name.attr,
+ &gdlm_attr_block.attr,
+ &gdlm_attr_withdraw.attr,
+ &gdlm_attr_id.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_recover_status.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, struct kobject *fskobj)
+{
+ int error;
+
+ error = kobject_set_name(&ls->kobj, "%s", "lock_module");
+ if (error) {
+ log_error("can't set kobj name %d", error);
+ return error;
+ }
+
+ ls->kobj.kset = &gdlm_kset;
+ ls->kobj.ktype = &gdlm_ktype;
+ ls->kobj.parent = fskobj;
+
+ error = kobject_register(&ls->kobj);
+ if (error)
+ log_error("can't register kobj %d", error);
+
+ return error;
+}
+
+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);
+}
+
--- /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_blocking(struct gdlm_lock *lp, int bast_mode)
+{
+ struct gdlm_ls *ls = lp->ls;
+ unsigned int cb = 0;
+
+ 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, "unknown bast mode %u", 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_info("complete dlm cancel %x,%llx flags %lx",
+ lp->lockname.ln_type,
+ (unsigned long long)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_info("unlock sb_status %d %x,%llx flags %lx",
+ lp->lksb.sb_status, lp->lockname.ln_type,
+ (unsigned long long)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_info("complete internal cancel %x,%llx",
+ lp->lockname.ln_type,
+ (unsigned long long)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_info("ast sb_status %d %x,%llx flags %lx",
+ lp->lksb.sb_status, lp->lockname.ln_type,
+ (unsigned long long)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, "%x,%llx",
+ lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number);
+ gdlm_assert(lp->prev_req > DLM_LOCK_NL, "%x,%llx",
+ lp->lockname.ln_type,
+ (unsigned long long)lp->lockname.ln_number);
+
+ 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,%llx id %x %d,%d",
+ lp->lockname.ln_type,
+ (unsigned long long)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)
+ gdlm_do_lock(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_error("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_error("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);
+}
+
--- /dev/null
+++ b/fs/gfs2/locking/dlm/lock_dlm.h
@@ -0,0 +1,188 @@
+/*
+ * 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.
+ */
+
+#ifndef LOCK_DLM_DOT_H
+#define LOCK_DLM_DOT_H
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/socket.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/kobject.h>
+#include <linux/fcntl.h>
+#include <linux/wait.h>
+#include <net/sock.h>
+
+#include <linux/dlm.h>
+#include "../../lm_interface.h"
+
+/*
+ * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
+ * prefix of lock_dlm_ gets awkward. Externally, GFS refers to this module
+ * as "lock_dlm".
+ */
+
+#define GDLM_STRNAME_BYTES 24
+#define GDLM_LVB_SIZE 32
+#define GDLM_DROP_COUNT 50000
+#define GDLM_DROP_PERIOD 60
+#define GDLM_NAME_LEN 128
+
+/* GFS uses 12 bytes to identify a resource (32 bit type + 64 bit number).
+ We sprintf these numbers into a 24 byte string of hex values to make them
+ human-readable (to make debugging simpler.) */
+
+struct gdlm_strname {
+ unsigned char name[GDLM_STRNAME_BYTES];
+ unsigned short namelen;
+};
+
+enum {
+ DFL_BLOCK_LOCKS = 0,
+ DFL_SPECTATOR = 1,
+ DFL_WITHDRAW = 2,
+};
+
+struct gdlm_ls {
+ uint32_t id;
+ int jid;
+ int first;
+ int first_done;
+ unsigned long flags;
+ struct kobject kobj;
+ char clustername[GDLM_NAME_LEN];
+ char fsname[GDLM_NAME_LEN];
+ int fsflags;
+ dlm_lockspace_t *dlm_lockspace;
+ lm_callback_t fscb;
+ lm_fsdata_t *fsdata;
+ int recover_jid;
+ int recover_jid_done;
+ int recover_jid_status;
+ spinlock_t async_lock;
+ struct list_head complete;
+ struct list_head blocking;
+ struct list_head delayed;
+ struct list_head submit;
+ struct list_head all_locks;
+ uint32_t all_locks_count;
+ wait_queue_head_t wait_control;
+ struct task_struct *thread1;
+ struct task_struct *thread2;
+ wait_queue_head_t thread_wait;
+ unsigned long drop_time;
+ int drop_locks_count;
+ int drop_locks_period;
+};
+
+enum {
+ LFL_NOBLOCK = 0,
+ LFL_NOCACHE = 1,
+ LFL_DLM_UNLOCK = 2,
+ LFL_DLM_CANCEL = 3,
+ LFL_SYNC_LVB = 4,
+ LFL_FORCE_PROMOTE = 5,
+ LFL_REREQUEST = 6,
+ LFL_ACTIVE = 7,
+ LFL_INLOCK = 8,
+ LFL_CANCEL = 9,
+ LFL_NOBAST = 10,
+ LFL_HEADQUE = 11,
+ LFL_UNLOCK_DELETE = 12,
+};
+
+struct gdlm_lock {
+ struct gdlm_ls *ls;
+ struct lm_lockname lockname;
+ char *lvb;
+ struct dlm_lksb lksb;
+
+ int16_t cur;
+ int16_t req;
+ int16_t prev_req;
+ uint32_t lkf; /* dlm flags DLM_LKF_ */
+ unsigned long flags; /* lock_dlm flags LFL_ */
+
+ int bast_mode; /* protected by async_lock */
+ struct completion ast_wait;
+
+ struct list_head clist; /* complete */
+ struct list_head blist; /* blocking */
+ struct list_head delay_list; /* delayed */
+ struct list_head all_list; /* all locks for the fs */
+ struct gdlm_lock *hold_null; /* NL lock for hold_lvb */
+};
+
+#define gdlm_assert(assertion, fmt, args...) \
+do { \
+ if (unlikely(!(assertion))) { \
+ printk(KERN_EMERG "lock_dlm: fatal assertion failed \"%s\"\n" \
+ "lock_dlm: " fmt "\n", \
+ #assertion, ##args); \
+ BUG(); \
+ } \
+} while (0)
+
+#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "\n" , ## arg)
+#define log_info(fmt, arg...) log_print(KERN_INFO , fmt , ## arg)
+#define log_error(fmt, arg...) log_print(KERN_ERR , fmt , ## arg)
+#ifdef LOCK_DLM_LOG_DEBUG
+#define log_debug(fmt, arg...) log_print(KERN_DEBUG , fmt , ## arg)
+#else
+#define log_debug(fmt, arg...)
+#endif
+
+/* sysfs.c */
+
+int gdlm_sysfs_init(void);
+void gdlm_sysfs_exit(void);
+int gdlm_kobject_setup(struct gdlm_ls *, struct kobject *);
+void gdlm_kobject_release(struct gdlm_ls *);
+
+/* thread.c */
+
+int gdlm_init_threads(struct gdlm_ls *);
+void gdlm_release_threads(struct gdlm_ls *);
+
+/* lock.c */
+
+int16_t gdlm_make_lmstate(int16_t);
+void gdlm_queue_delayed(struct gdlm_lock *);
+void gdlm_submit_delayed(struct gdlm_ls *);
+int gdlm_release_all_locks(struct gdlm_ls *);
+void gdlm_delete_lp(struct gdlm_lock *);
+unsigned int gdlm_do_lock(struct gdlm_lock *);
+
+int gdlm_get_lock(lm_lockspace_t *, struct lm_lockname *, lm_lock_t **);
+void gdlm_put_lock(lm_lock_t *);
+unsigned int gdlm_lock(lm_lock_t *, unsigned int, unsigned int, unsigned int);
+unsigned int gdlm_unlock(lm_lock_t *, unsigned int);
+void gdlm_cancel(lm_lock_t *);
+int gdlm_hold_lvb(lm_lock_t *, char **);
+void gdlm_unhold_lvb(lm_lock_t *, char *);
+void gdlm_sync_lvb(lm_lock_t *, char *);
+
+/* plock.c */
+
+int gdlm_plock_init(void);
+void gdlm_plock_exit(void);
+int gdlm_plock(lm_lockspace_t *, struct lm_lockname *, struct file *, int,
+ struct file_lock *);
+int gdlm_plock_get(lm_lockspace_t *, struct lm_lockname *, struct file *,
+ struct file_lock *);
+int gdlm_punlock(lm_lockspace_t *, struct lm_lockname *, struct file *,
+ struct file_lock *);
+#endif
+
--- /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 plock.o
+
--- /dev/null
+++ b/include/linux/lock_dlm_plock.h
@@ -0,0 +1,41 @@
+/*
+ * 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.
+ */
+
+#ifndef __LOCK_DLM_PLOCK_DOT_H__
+#define __LOCK_DLM_PLOCK_DOT_H__
+
+#define GDLM_PLOCK_MISC_NAME "lock_dlm_plock"
+
+#define GDLM_PLOCK_VERSION_MAJOR 1
+#define GDLM_PLOCK_VERSION_MINOR 1
+#define GDLM_PLOCK_VERSION_PATCH 0
+
+enum {
+ GDLM_PLOCK_OP_LOCK = 1,
+ GDLM_PLOCK_OP_UNLOCK,
+ GDLM_PLOCK_OP_GET,
+};
+
+struct gdlm_plock_info {
+ __u32 version[3];
+ __u8 optype;
+ __u8 ex;
+ __u8 wait;
+ __u8 pad;
+ __u32 pid;
+ __s32 nodeid;
+ __s32 rv;
+ __u32 fsid;
+ __u64 number;
+ __u64 start;
+ __u64 end;
+ __u64 owner;
+};
+
+#endif
+
-
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